openocd/src/target/target.c

/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007-2010 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008, Duane Ellis                                       *
 *   openocd@duaneeellis.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 *                                                                         *
 *   Copyright (C) 2008 by Rick Altherr                                    *
 *   kc8apf@kc8apf.net>                                                    *
 *                                                                         *
 *   Copyright (C) 2011 by Broadcom Corporation                            *
 *   Evan Hunter - ehunter@broadcom.com                                    *
 *                                                                         *
 *   Copyright (C) ST-Ericsson SA 2011                                     *
 *   michel.jaouen@stericsson.com : smp minimum support                    *
 *                                                                         *
 *   Copyright (C) 2011 Andreas Fritiofson                                 *
 *   andreas.fritiofson@gmail.com                                          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <helper/align.h>
#include <helper/time_support.h>
#include <jtag/jtag.h>
#include <flash/nor/core.h>

#include "target.h"
#include "target_type.h"
#include "target_request.h"
#include "breakpoints.h"
#include "register.h"
#include "trace.h"
#include "image.h"
#include "rtos/rtos.h"
#include "transport/transport.h"
#include "arm_cti.h"
#include "smp.h"
#include "semihosting_common.h"

/* default halt wait timeout (ms) */
#define DEFAULT_HALT_TIMEOUT 5000

static int target_read_buffer_default(struct target *target, target_addr_t address,
		uint32_t count, uint8_t *buffer);
static int target_write_buffer_default(struct target *target, target_addr_t address,
		uint32_t count, const uint8_t *buffer);
static int target_array2mem(Jim_Interp *interp, struct target *target,
		int argc, Jim_Obj * const *argv);
static int target_mem2array(Jim_Interp *interp, struct target *target,
		int argc, Jim_Obj * const *argv);
static int target_register_user_commands(struct command_context *cmd_ctx);
static int target_get_gdb_fileio_info_default(struct target *target,
		struct gdb_fileio_info *fileio_info);
static int target_gdb_fileio_end_default(struct target *target, int retcode,
		int fileio_errno, bool ctrl_c);

/* targets */
extern struct target_type arm7tdmi_target;
extern struct target_type arm720t_target;
extern struct target_type arm9tdmi_target;
extern struct target_type arm920t_target;
extern struct target_type arm966e_target;
extern struct target_type arm946e_target;
extern struct target_type arm926ejs_target;
extern struct target_type fa526_target;
extern struct target_type feroceon_target;
extern struct target_type dragonite_target;
extern struct target_type xscale_target;
extern struct target_type cortexm_target;
extern struct target_type cortexa_target;
extern struct target_type aarch64_target;
extern struct target_type cortexr4_target;
extern struct target_type arm11_target;
extern struct target_type ls1_sap_target;
extern struct target_type mips_m4k_target;
extern struct target_type mips_mips64_target;
extern struct target_type avr_target;
extern struct target_type dsp563xx_target;
extern struct target_type dsp5680xx_target;
extern struct target_type testee_target;
extern struct target_type avr32_ap7k_target;
extern struct target_type hla_target;
extern struct target_type nds32_v2_target;
extern struct target_type nds32_v3_target;
extern struct target_type nds32_v3m_target;
extern struct target_type or1k_target;
extern struct target_type quark_x10xx_target;
extern struct target_type quark_d20xx_target;
extern struct target_type stm8_target;
extern struct target_type riscv_target;
extern struct target_type mem_ap_target;
extern struct target_type esirisc_target;
extern struct target_type arcv2_target;

static struct target_type *target_types[] = {
	&arm7tdmi_target,
	&arm9tdmi_target,
	&arm920t_target,
	&arm720t_target,
	&arm966e_target,
	&arm946e_target,
	&arm926ejs_target,
	&fa526_target,
	&feroceon_target,
	&dragonite_target,
	&xscale_target,
	&cortexm_target,
	&cortexa_target,
	&cortexr4_target,
	&arm11_target,
	&ls1_sap_target,
	&mips_m4k_target,
	&avr_target,
	&dsp563xx_target,
	&dsp5680xx_target,
	&testee_target,
	&avr32_ap7k_target,
	&hla_target,
	&nds32_v2_target,
	&nds32_v3_target,
	&nds32_v3m_target,
	&or1k_target,
	&quark_x10xx_target,
	&quark_d20xx_target,
	&stm8_target,
	&riscv_target,
	&mem_ap_target,
	&esirisc_target,
	&arcv2_target,
	&aarch64_target,
	&mips_mips64_target,
	NULL,
};

struct target *all_targets;
static struct target_event_callback *target_event_callbacks;
static struct target_timer_callback *target_timer_callbacks;
static int64_t target_timer_next_event_value;
static LIST_HEAD(target_reset_callback_list);
static LIST_HEAD(target_trace_callback_list);
static const int polling_interval = TARGET_DEFAULT_POLLING_INTERVAL;
static LIST_HEAD(empty_smp_targets);

static const struct jim_nvp nvp_assert[] = {
	{ .name = "assert", NVP_ASSERT },
	{ .name = "deassert", NVP_DEASSERT },
	{ .name = "T", NVP_ASSERT },
	{ .name = "F", NVP_DEASSERT },
	{ .name = "t", NVP_ASSERT },
	{ .name = "f", NVP_DEASSERT },
	{ .name = NULL, .value = -1 }
};

static const struct jim_nvp nvp_error_target[] = {
	{ .value = ERROR_TARGET_INVALID, .name = "err-invalid" },
	{ .value = ERROR_TARGET_INIT_FAILED, .name = "err-init-failed" },
	{ .value = ERROR_TARGET_TIMEOUT, .name = "err-timeout" },
	{ .value = ERROR_TARGET_NOT_HALTED, .name = "err-not-halted" },
	{ .value = ERROR_TARGET_FAILURE, .name = "err-failure" },
	{ .value = ERROR_TARGET_UNALIGNED_ACCESS, .name = "err-unaligned-access" },
	{ .value = ERROR_TARGET_DATA_ABORT, .name = "err-data-abort" },
	{ .value = ERROR_TARGET_RESOURCE_NOT_AVAILABLE, .name = "err-resource-not-available" },
	{ .value = ERROR_TARGET_TRANSLATION_FAULT, .name = "err-translation-fault" },
	{ .value = ERROR_TARGET_NOT_RUNNING, .name = "err-not-running" },
	{ .value = ERROR_TARGET_NOT_EXAMINED, .name = "err-not-examined" },
	{ .value = -1, .name = NULL }
};

static const char *target_strerror_safe(int err)
{
	const struct jim_nvp *n;

	n = jim_nvp_value2name_simple(nvp_error_target, err);
	if (!n->name)
		return "unknown";
	else
		return n->name;
}

static const struct jim_nvp nvp_target_event[] = {

	{ .value = TARGET_EVENT_GDB_HALT, .name = "gdb-halt" },
	{ .value = TARGET_EVENT_HALTED, .name = "halted" },
	{ .value = TARGET_EVENT_RESUMED, .name = "resumed" },
	{ .value = TARGET_EVENT_RESUME_START, .name = "resume-start" },
	{ .value = TARGET_EVENT_RESUME_END, .name = "resume-end" },
	{ .value = TARGET_EVENT_STEP_START, .name = "step-start" },
	{ .value = TARGET_EVENT_STEP_END, .name = "step-end" },

	{ .name = "gdb-start", .value = TARGET_EVENT_GDB_START },
	{ .name = "gdb-end", .value = TARGET_EVENT_GDB_END },

	{ .value = TARGET_EVENT_RESET_START,         .name = "reset-start" },
	{ .value = TARGET_EVENT_RESET_ASSERT_PRE,    .name = "reset-assert-pre" },
	{ .value = TARGET_EVENT_RESET_ASSERT,        .name = "reset-assert" },
	{ .value = TARGET_EVENT_RESET_ASSERT_POST,   .name = "reset-assert-post" },
	{ .value = TARGET_EVENT_RESET_DEASSERT_PRE,  .name = "reset-deassert-pre" },
	{ .value = TARGET_EVENT_RESET_DEASSERT_POST, .name = "reset-deassert-post" },
	{ .value = TARGET_EVENT_RESET_INIT,          .name = "reset-init" },
	{ .value = TARGET_EVENT_RESET_END,           .name = "reset-end" },

	{ .value = TARGET_EVENT_EXAMINE_START, .name = "examine-start" },
	{ .value = TARGET_EVENT_EXAMINE_FAIL, .name = "examine-fail" },
	{ .value = TARGET_EVENT_EXAMINE_END, .name = "examine-end" },

	{ .value = TARGET_EVENT_DEBUG_HALTED, .name = "debug-halted" },
	{ .value = TARGET_EVENT_DEBUG_RESUMED, .name = "debug-resumed" },

	{ .value = TARGET_EVENT_GDB_ATTACH, .name = "gdb-attach" },
	{ .value = TARGET_EVENT_GDB_DETACH, .name = "gdb-detach" },

	{ .value = TARGET_EVENT_GDB_FLASH_WRITE_START, .name = "gdb-flash-write-start" },
	{ .value = TARGET_EVENT_GDB_FLASH_WRITE_END,   .name = "gdb-flash-write-end"   },

	{ .value = TARGET_EVENT_GDB_FLASH_ERASE_START, .name = "gdb-flash-erase-start" },
	{ .value = TARGET_EVENT_GDB_FLASH_ERASE_END,   .name = "gdb-flash-erase-end" },

	{ .value = TARGET_EVENT_TRACE_CONFIG, .name = "trace-config" },

	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x100, .name = "semihosting-user-cmd-0x100" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x101, .name = "semihosting-user-cmd-0x101" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x102, .name = "semihosting-user-cmd-0x102" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x103, .name = "semihosting-user-cmd-0x103" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x104, .name = "semihosting-user-cmd-0x104" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x105, .name = "semihosting-user-cmd-0x105" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x106, .name = "semihosting-user-cmd-0x106" },
	{ .value = TARGET_EVENT_SEMIHOSTING_USER_CMD_0x107, .name = "semihosting-user-cmd-0x107" },

	{ .name = NULL, .value = -1 }
};

static const struct jim_nvp nvp_target_state[] = {
	{ .name = "unknown", .value = TARGET_UNKNOWN },
	{ .name = "running", .value = TARGET_RUNNING },
	{ .name = "halted",  .value = TARGET_HALTED },
	{ .name = "reset",   .value = TARGET_RESET },
	{ .name = "debug-running", .value = TARGET_DEBUG_RUNNING },
	{ .name = NULL, .value = -1 },
};

static const struct jim_nvp nvp_target_debug_reason[] = {
	{ .name = "debug-request",             .value = DBG_REASON_DBGRQ },
	{ .name = "breakpoint",                .value = DBG_REASON_BREAKPOINT },
	{ .name = "watchpoint",                .value = DBG_REASON_WATCHPOINT },
	{ .name = "watchpoint-and-breakpoint", .value = DBG_REASON_WPTANDBKPT },
	{ .name = "single-step",               .value = DBG_REASON_SINGLESTEP },
	{ .name = "target-not-halted",         .value = DBG_REASON_NOTHALTED  },
	{ .name = "program-exit",              .value = DBG_REASON_EXIT },
	{ .name = "exception-catch",           .value = DBG_REASON_EXC_CATCH },
	{ .name = "undefined",                 .value = DBG_REASON_UNDEFINED },
	{ .name = NULL, .value = -1 },
};

static const struct jim_nvp nvp_target_endian[] = {
	{ .name = "big",    .value = TARGET_BIG_ENDIAN },
	{ .name = "little", .value = TARGET_LITTLE_ENDIAN },
	{ .name = "be",     .value = TARGET_BIG_ENDIAN },
	{ .name = "le",     .value = TARGET_LITTLE_ENDIAN },
	{ .name = NULL,     .value = -1 },
};

static const struct jim_nvp nvp_reset_modes[] = {
	{ .name = "unknown", .value = RESET_UNKNOWN },
	{ .name = "run",     .value = RESET_RUN },
	{ .name = "halt",    .value = RESET_HALT },
	{ .name = "init",    .value = RESET_INIT },
	{ .name = NULL,      .value = -1 },
};

const char *debug_reason_name(struct target *t)
{
	const char *cp;

	cp = jim_nvp_value2name_simple(nvp_target_debug_reason,
			t->debug_reason)->name;
	if (!cp) {
		LOG_ERROR("Invalid debug reason: %d", (int)(t->debug_reason));
		cp = "(*BUG*unknown*BUG*)";
	}
	return cp;
}

const char *target_state_name(struct target *t)
{
	const char *cp;
	cp = jim_nvp_value2name_simple(nvp_target_state, t->state)->name;
	if (!cp) {
		LOG_ERROR("Invalid target state: %d", (int)(t->state));
		cp = "(*BUG*unknown*BUG*)";
	}

	if (!target_was_examined(t) && t->defer_examine)
		cp = "examine deferred";

	return cp;
}

const char *target_event_name(enum target_event event)
{
	const char *cp;
	cp = jim_nvp_value2name_simple(nvp_target_event, event)->name;
	if (!cp) {
		LOG_ERROR("Invalid target event: %d", (int)(event));
		cp = "(*BUG*unknown*BUG*)";
	}
	return cp;
}

const char *target_reset_mode_name(enum target_reset_mode reset_mode)
{
	const char *cp;
	cp = jim_nvp_value2name_simple(nvp_reset_modes, reset_mode)->name;
	if (!cp) {
		LOG_ERROR("Invalid target reset mode: %d", (int)(reset_mode));
		cp = "(*BUG*unknown*BUG*)";
	}
	return cp;
}

/* determine the number of the new target */
static int new_target_number(void)
{
	struct target *t;
	int x;

	/* number is 0 based */
	x = -1;
	t = all_targets;
	while (t) {
		if (x < t->target_number)
			x = t->target_number;
		t = t->next;
	}
	return x + 1;
}

static void append_to_list_all_targets(struct target *target)
{
	struct target **t = &all_targets;

	while (*t)
		t = &((*t)->next);
	*t = target;
}

/* read a uint64_t from a buffer in target memory endianness */
uint64_t target_buffer_get_u64(struct target *target, const uint8_t *buffer)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		return le_to_h_u64(buffer);
	else
		return be_to_h_u64(buffer);
}

/* read a uint32_t from a buffer in target memory endianness */
uint32_t target_buffer_get_u32(struct target *target, const uint8_t *buffer)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		return le_to_h_u32(buffer);
	else
		return be_to_h_u32(buffer);
}

/* read a uint24_t from a buffer in target memory endianness */
uint32_t target_buffer_get_u24(struct target *target, const uint8_t *buffer)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		return le_to_h_u24(buffer);
	else
		return be_to_h_u24(buffer);
}

/* read a uint16_t from a buffer in target memory endianness */
uint16_t target_buffer_get_u16(struct target *target, const uint8_t *buffer)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		return le_to_h_u16(buffer);
	else
		return be_to_h_u16(buffer);
}

/* write a uint64_t to a buffer in target memory endianness */
void target_buffer_set_u64(struct target *target, uint8_t *buffer, uint64_t value)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		h_u64_to_le(buffer, value);
	else
		h_u64_to_be(buffer, value);
}

/* write a uint32_t to a buffer in target memory endianness */
void target_buffer_set_u32(struct target *target, uint8_t *buffer, uint32_t value)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		h_u32_to_le(buffer, value);
	else
		h_u32_to_be(buffer, value);
}

/* write a uint24_t to a buffer in target memory endianness */
void target_buffer_set_u24(struct target *target, uint8_t *buffer, uint32_t value)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		h_u24_to_le(buffer, value);
	else
		h_u24_to_be(buffer, value);
}

/* write a uint16_t to a buffer in target memory endianness */
void target_buffer_set_u16(struct target *target, uint8_t *buffer, uint16_t value)
{
	if (target->endianness == TARGET_LITTLE_ENDIAN)
		h_u16_to_le(buffer, value);
	else
		h_u16_to_be(buffer, value);
}

/* write a uint8_t to a buffer in target memory endianness */
static void target_buffer_set_u8(struct target *target, uint8_t *buffer, uint8_t value)
{
	*buffer = value;
}

/* write a uint64_t array to a buffer in target memory endianness */
void target_buffer_get_u64_array(struct target *target, const uint8_t *buffer, uint32_t count, uint64_t *dstbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		dstbuf[i] = target_buffer_get_u64(target, &buffer[i * 8]);
}

/* write a uint32_t array to a buffer in target memory endianness */
void target_buffer_get_u32_array(struct target *target, const uint8_t *buffer, uint32_t count, uint32_t *dstbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		dstbuf[i] = target_buffer_get_u32(target, &buffer[i * 4]);
}

/* write a uint16_t array to a buffer in target memory endianness */
void target_buffer_get_u16_array(struct target *target, const uint8_t *buffer, uint32_t count, uint16_t *dstbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		dstbuf[i] = target_buffer_get_u16(target, &buffer[i * 2]);
}

/* write a uint64_t array to a buffer in target memory endianness */
void target_buffer_set_u64_array(struct target *target, uint8_t *buffer, uint32_t count, const uint64_t *srcbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		target_buffer_set_u64(target, &buffer[i * 8], srcbuf[i]);
}

/* write a uint32_t array to a buffer in target memory endianness */
void target_buffer_set_u32_array(struct target *target, uint8_t *buffer, uint32_t count, const uint32_t *srcbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		target_buffer_set_u32(target, &buffer[i * 4], srcbuf[i]);
}

/* write a uint16_t array to a buffer in target memory endianness */
void target_buffer_set_u16_array(struct target *target, uint8_t *buffer, uint32_t count, const uint16_t *srcbuf)
{
	uint32_t i;
	for (i = 0; i < count; i++)
		target_buffer_set_u16(target, &buffer[i * 2], srcbuf[i]);
}

/* return a pointer to a configured target; id is name or number */
struct target *get_target(const char *id)
{
	struct target *target;

	/* try as tcltarget name */
	for (target = all_targets; target; target = target->next) {
		if (!target_name(target))
			continue;
		if (strcmp(id, target_name(target)) == 0)
			return target;
	}

	/* It's OK to remove this fallback sometime after August 2010 or so */

	/* no match, try as number */
	unsigned num;
	if (parse_uint(id, &num) != ERROR_OK)
		return NULL;

	for (target = all_targets; target; target = target->next) {
		if (target->target_number == (int)num) {
			LOG_WARNING("use '%s' as target identifier, not '%u'",
					target_name(target), num);
			return target;
		}
	}

	return NULL;
}

/* returns a pointer to the n-th configured target */
struct target *get_target_by_num(int num)
{
	struct target *target = all_targets;

	while (target) {
		if (target->target_number == num)
			return target;
		target = target->next;
	}

	return NULL;
}

struct target *get_current_target(struct command_context *cmd_ctx)
{
	struct target *target = get_current_target_or_null(cmd_ctx);

	if (!target) {
		LOG_ERROR("BUG: current_target out of bounds");
		exit(-1);
	}

	return target;
}

struct target *get_current_target_or_null(struct command_context *cmd_ctx)
{
	return cmd_ctx->current_target_override
		? cmd_ctx->current_target_override
		: cmd_ctx->current_target;
}

int target_poll(struct target *target)
{
	int retval;

	/* We can't poll until after examine */
	if (!target_was_examined(target)) {
		/* Fail silently lest we pollute the log */
		return ERROR_FAIL;
	}

	retval = target->type->poll(target);
	if (retval != ERROR_OK)
		return retval;

	if (target->halt_issued) {
		if (target->state == TARGET_HALTED)
			target->halt_issued = false;
		else {
			int64_t t = timeval_ms() - target->halt_issued_time;
			if (t > DEFAULT_HALT_TIMEOUT) {
				target->halt_issued = false;
				LOG_INFO("Halt timed out, wake up GDB.");
				target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
			}
		}
	}

	return ERROR_OK;
}

int target_halt(struct target *target)
{
	int retval;
	/* We can't poll until after examine */
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	retval = target->type->halt(target);
	if (retval != ERROR_OK)
		return retval;

	target->halt_issued = true;
	target->halt_issued_time = timeval_ms();

	return ERROR_OK;
}

/**
 * Make the target (re)start executing using its saved execution
 * context (possibly with some modifications).
 *
 * @param target Which target should start executing.
 * @param current True to use the target's saved program counter instead
 *	of the address parameter
 * @param address Optionally used as the program counter.
 * @param handle_breakpoints True iff breakpoints at the resumption PC
 *	should be skipped.  (For example, maybe execution was stopped by
 *	such a breakpoint, in which case it would be counterproductive to
 *	let it re-trigger.
 * @param debug_execution False if all working areas allocated by OpenOCD
 *	should be released and/or restored to their original contents.
 *	(This would for example be true to run some downloaded "helper"
 *	algorithm code, which resides in one such working buffer and uses
 *	another for data storage.)
 *
 * @todo Resolve the ambiguity about what the "debug_execution" flag
 * signifies.  For example, Target implementations don't agree on how
 * it relates to invalidation of the register cache, or to whether
 * breakpoints and watchpoints should be enabled.  (It would seem wrong
 * to enable breakpoints when running downloaded "helper" algorithms
 * (debug_execution true), since the breakpoints would be set to match
 * target firmware being debugged, not the helper algorithm.... and
 * enabling them could cause such helpers to malfunction (for example,
 * by overwriting data with a breakpoint instruction.  On the other
 * hand the infrastructure for running such helpers might use this
 * procedure but rely on hardware breakpoint to detect termination.)
 */
int target_resume(struct target *target, int current, target_addr_t address,
		int handle_breakpoints, int debug_execution)
{
	int retval;

	/* We can't poll until after examine */
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	target_call_event_callbacks(target, TARGET_EVENT_RESUME_START);

	/* note that resume *must* be asynchronous. The CPU can halt before
	 * we poll. The CPU can even halt at the current PC as a result of
	 * a software breakpoint being inserted by (a bug?) the application.
	 */
	/*
	 * resume() triggers the event 'resumed'. The execution of TCL commands
	 * in the event handler causes the polling of targets. If the target has
	 * already halted for a breakpoint, polling will run the 'halted' event
	 * handler before the pending 'resumed' handler.
	 * Disable polling during resume() to guarantee the execution of handlers
	 * in the correct order.
	 */
	bool save_poll = jtag_poll_get_enabled();
	jtag_poll_set_enabled(false);
	retval = target->type->resume(target, current, address, handle_breakpoints, debug_execution);
	jtag_poll_set_enabled(save_poll);
	if (retval != ERROR_OK)
		return retval;

	target_call_event_callbacks(target, TARGET_EVENT_RESUME_END);

	return retval;
}

static int target_process_reset(struct command_invocation *cmd, enum target_reset_mode reset_mode)
{
	char buf[100];
	int retval;
	struct jim_nvp *n;
	n = jim_nvp_value2name_simple(nvp_reset_modes, reset_mode);
	if (!n->name) {
		LOG_ERROR("invalid reset mode");
		return ERROR_FAIL;
	}

	struct target *target;
	for (target = all_targets; target; target = target->next)
		target_call_reset_callbacks(target, reset_mode);

	/* disable polling during reset to make reset event scripts
	 * more predictable, i.e. dr/irscan & pathmove in events will
	 * not have JTAG operations injected into the middle of a sequence.
	 */
	bool save_poll = jtag_poll_get_enabled();

	jtag_poll_set_enabled(false);

	sprintf(buf, "ocd_process_reset %s", n->name);
	retval = Jim_Eval(cmd->ctx->interp, buf);

	jtag_poll_set_enabled(save_poll);

	if (retval != JIM_OK) {
		Jim_MakeErrorMessage(cmd->ctx->interp);
		command_print(cmd, "%s", Jim_GetString(Jim_GetResult(cmd->ctx->interp), NULL));
		return ERROR_FAIL;
	}

	/* We want any events to be processed before the prompt */
	retval = target_call_timer_callbacks_now();

	for (target = all_targets; target; target = target->next) {
		target->type->check_reset(target);
		target->running_alg = false;
	}

	return retval;
}

static int identity_virt2phys(struct target *target,
		target_addr_t virtual, target_addr_t *physical)
{
	*physical = virtual;
	return ERROR_OK;
}

static int no_mmu(struct target *target, int *enabled)
{
	*enabled = 0;
	return ERROR_OK;
}

/**
 * Reset the @c examined flag for the given target.
 * Pure paranoia -- targets are zeroed on allocation.
 */
static inline void target_reset_examined(struct target *target)
{
	target->examined = false;
}

static int default_examine(struct target *target)
{
	target_set_examined(target);
	return ERROR_OK;
}

/* no check by default */
static int default_check_reset(struct target *target)
{
	return ERROR_OK;
}

/* Equivalent Tcl code arp_examine_one is in src/target/startup.tcl
 * Keep in sync */
int target_examine_one(struct target *target)
{
	target_call_event_callbacks(target, TARGET_EVENT_EXAMINE_START);

	int retval = target->type->examine(target);
	if (retval != ERROR_OK) {
		target_reset_examined(target);
		target_call_event_callbacks(target, TARGET_EVENT_EXAMINE_FAIL);
		return retval;
	}

	target_set_examined(target);
	target_call_event_callbacks(target, TARGET_EVENT_EXAMINE_END);

	return ERROR_OK;
}

static int jtag_enable_callback(enum jtag_event event, void *priv)
{
	struct target *target = priv;

	if (event != JTAG_TAP_EVENT_ENABLE || !target->tap->enabled)
		return ERROR_OK;

	jtag_unregister_event_callback(jtag_enable_callback, target);

	return target_examine_one(target);
}

/* Targets that correctly implement init + examine, i.e.
 * no communication with target during init:
 *
 * XScale
 */
int target_examine(void)
{
	int retval = ERROR_OK;
	struct target *target;

	for (target = all_targets; target; target = target->next) {
		/* defer examination, but don't skip it */
		if (!target->tap->enabled) {
			jtag_register_event_callback(jtag_enable_callback,
					target);
			continue;
		}

		if (target->defer_examine)
			continue;

		int retval2 = target_examine_one(target);
		if (retval2 != ERROR_OK) {
			LOG_WARNING("target %s examination failed", target_name(target));
			retval = retval2;
		}
	}
	return retval;
}

const char *target_type_name(struct target *target)
{
	return target->type->name;
}

static int target_soft_reset_halt(struct target *target)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->soft_reset_halt) {
		LOG_ERROR("Target %s does not support soft_reset_halt",
				target_name(target));
		return ERROR_FAIL;
	}
	return target->type->soft_reset_halt(target);
}

/**
 * Downloads a target-specific native code algorithm to the target,
 * and executes it.  * Note that some targets may need to set up, enable,
 * and tear down a breakpoint (hard or * soft) to detect algorithm
 * termination, while others may support  lower overhead schemes where
 * soft breakpoints embedded in the algorithm automatically terminate the
 * algorithm.
 *
 * @param target used to run the algorithm
 * @param num_mem_params
 * @param mem_params
 * @param num_reg_params
 * @param reg_param
 * @param entry_point
 * @param exit_point
 * @param timeout_ms
 * @param arch_info target-specific description of the algorithm.
 */
int target_run_algorithm(struct target *target,
		int num_mem_params, struct mem_param *mem_params,
		int num_reg_params, struct reg_param *reg_param,
		target_addr_t entry_point, target_addr_t exit_point,
		int timeout_ms, void *arch_info)
{
	int retval = ERROR_FAIL;

	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		goto done;
	}
	if (!target->type->run_algorithm) {
		LOG_ERROR("Target type '%s' does not support %s",
				target_type_name(target), __func__);
		goto done;
	}

	target->running_alg = true;
	retval = target->type->run_algorithm(target,
			num_mem_params, mem_params,
			num_reg_params, reg_param,
			entry_point, exit_point, timeout_ms, arch_info);
	target->running_alg = false;

done:
	return retval;
}

/**
 * Executes a target-specific native code algorithm and leaves it running.
 *
 * @param target used to run the algorithm
 * @param num_mem_params
 * @param mem_params
 * @param num_reg_params
 * @param reg_params
 * @param entry_point
 * @param exit_point
 * @param arch_info target-specific description of the algorithm.
 */
int target_start_algorithm(struct target *target,
		int num_mem_params, struct mem_param *mem_params,
		int num_reg_params, struct reg_param *reg_params,
		target_addr_t entry_point, target_addr_t exit_point,
		void *arch_info)
{
	int retval = ERROR_FAIL;

	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		goto done;
	}
	if (!target->type->start_algorithm) {
		LOG_ERROR("Target type '%s' does not support %s",
				target_type_name(target), __func__);
		goto done;
	}
	if (target->running_alg) {
		LOG_ERROR("Target is already running an algorithm");
		goto done;
	}

	target->running_alg = true;
	retval = target->type->start_algorithm(target,
			num_mem_params, mem_params,
			num_reg_params, reg_params,
			entry_point, exit_point, arch_info);

done:
	return retval;
}

/**
 * Waits for an algorithm started with target_start_algorithm() to complete.
 *
 * @param target used to run the algorithm
 * @param num_mem_params
 * @param mem_params
 * @param num_reg_params
 * @param reg_params
 * @param exit_point
 * @param timeout_ms
 * @param arch_info target-specific description of the algorithm.
 */
int target_wait_algorithm(struct target *target,
		int num_mem_params, struct mem_param *mem_params,
		int num_reg_params, struct reg_param *reg_params,
		target_addr_t exit_point, int timeout_ms,
		void *arch_info)
{
	int retval = ERROR_FAIL;

	if (!target->type->wait_algorithm) {
		LOG_ERROR("Target type '%s' does not support %s",
				target_type_name(target), __func__);
		goto done;
	}
	if (!target->running_alg) {
		LOG_ERROR("Target is not running an algorithm");
		goto done;
	}

	retval = target->type->wait_algorithm(target,
			num_mem_params, mem_params,
			num_reg_params, reg_params,
			exit_point, timeout_ms, arch_info);
	if (retval != ERROR_TARGET_TIMEOUT)
		target->running_alg = false;

done:
	return retval;
}

/**
 * Streams data to a circular buffer on target intended for consumption by code
 * running asynchronously on target.
 *
 * This is intended for applications where target-specific native code runs
 * on the target, receives data from the circular buffer, does something with
 * it (most likely writing it to a flash memory), and advances the circular
 * buffer pointer.
 *
 * This assumes that the helper algorithm has already been loaded to the target,
 * but has not been started yet. Given memory and register parameters are passed
 * to the algorithm.
 *
 * The buffer is defined by (buffer_start, buffer_size) arguments and has the
 * following format:
 *
 *     [buffer_start + 0, buffer_start + 4):
 *         Write Pointer address (aka head). Written and updated by this
 *         routine when new data is written to the circular buffer.
 *     [buffer_start + 4, buffer_start + 8):
 *         Read Pointer address (aka tail). Updated by code running on the
 *         target after it consumes data.
 *     [buffer_start + 8, buffer_start + buffer_size):
 *         Circular buffer contents.
 *
 * See contrib/loaders/flash/stm32f1x.S for an example.
 *
 * @param target used to run the algorithm
 * @param buffer address on the host where data to be sent is located
 * @param count number of blocks to send
 * @param block_size size in bytes of each block
 * @param num_mem_params count of memory-based params to pass to algorithm
 * @param mem_params memory-based params to pass to algorithm
 * @param num_reg_params count of register-based params to pass to algorithm
 * @param reg_params memory-based params to pass to algorithm
 * @param buffer_start address on the target of the circular buffer structure
 * @param buffer_size size of the circular buffer structure
 * @param entry_point address on the target to execute to start the algorithm
 * @param exit_point address at which to set a breakpoint to catch the
 *     end of the algorithm; can be 0 if target triggers a breakpoint itself
 * @param arch_info
 */

int target_run_flash_async_algorithm(struct target *target,
		const uint8_t *buffer, uint32_t count, int block_size,
		int num_mem_params, struct mem_param *mem_params,
		int num_reg_params, struct reg_param *reg_params,
		uint32_t buffer_start, uint32_t buffer_size,
		uint32_t entry_point, uint32_t exit_point, void *arch_info)
{
	int retval;
	int timeout = 0;

	const uint8_t *buffer_orig = buffer;

	/* Set up working area. First word is write pointer, second word is read pointer,
	 * rest is fifo data area. */
	uint32_t wp_addr = buffer_start;
	uint32_t rp_addr = buffer_start + 4;
	uint32_t fifo_start_addr = buffer_start + 8;
	uint32_t fifo_end_addr = buffer_start + buffer_size;

	uint32_t wp = fifo_start_addr;
	uint32_t rp = fifo_start_addr;

	/* validate block_size is 2^n */
	assert(IS_PWR_OF_2(block_size));

	retval = target_write_u32(target, wp_addr, wp);
	if (retval != ERROR_OK)
		return retval;
	retval = target_write_u32(target, rp_addr, rp);
	if (retval != ERROR_OK)
		return retval;

	/* Start up algorithm on target and let it idle while writing the first chunk */
	retval = target_start_algorithm(target, num_mem_params, mem_params,
			num_reg_params, reg_params,
			entry_point,
			exit_point,
			arch_info);

	if (retval != ERROR_OK) {
		LOG_ERROR("error starting target flash write algorithm");
		return retval;
	}

	while (count > 0) {

		retval = target_read_u32(target, rp_addr, &rp);
		if (retval != ERROR_OK) {
			LOG_ERROR("failed to get read pointer");
			break;
		}

		LOG_DEBUG("offs 0x%zx count 0x%" PRIx32 " wp 0x%" PRIx32 " rp 0x%" PRIx32,
			(size_t) (buffer - buffer_orig), count, wp, rp);

		if (rp == 0) {
			LOG_ERROR("flash write algorithm aborted by target");
			retval = ERROR_FLASH_OPERATION_FAILED;
			break;
		}

		if (!IS_ALIGNED(rp - fifo_start_addr, block_size) || rp < fifo_start_addr || rp >= fifo_end_addr) {
			LOG_ERROR("corrupted fifo read pointer 0x%" PRIx32, rp);
			break;
		}

		/* Count the number of bytes available in the fifo without
		 * crossing the wrap around. Make sure to not fill it completely,
		 * because that would make wp == rp and that's the empty condition. */
		uint32_t thisrun_bytes;
		if (rp > wp)
			thisrun_bytes = rp - wp - block_size;
		else if (rp > fifo_start_addr)
			thisrun_bytes = fifo_end_addr - wp;
		else
			thisrun_bytes = fifo_end_addr - wp - block_size;

		if (thisrun_bytes == 0) {
			/* Throttle polling a bit if transfer is (much) faster than flash
			 * programming. The exact delay shouldn't matter as long as it's
			 * less than buffer size / flash speed. This is very unlikely to
			 * run when using high latency connections such as USB. */
			alive_sleep(2);

			/* to stop an infinite loop on some targets check and increment a timeout
			 * this issue was observed on a stellaris using the new ICDI interface */
			if (timeout++ >= 2500) {
				LOG_ERROR("timeout waiting for algorithm, a target reset is recommended");
				return ERROR_FLASH_OPERATION_FAILED;
			}
			continue;
		}

		/* reset our timeout */
		timeout = 0;

		/* Limit to the amount of data we actually want to write */
		if (thisrun_bytes > count * block_size)
			thisrun_bytes = count * block_size;

		/* Force end of large blocks to be word aligned */
		if (thisrun_bytes >= 16)
			thisrun_bytes -= (rp + thisrun_bytes) & 0x03;

		/* Write data to fifo */
		retval = target_write_buffer(target, wp, thisrun_bytes, buffer);
		if (retval != ERROR_OK)
			break;

		/* Update counters and wrap write pointer */
		buffer += thisrun_bytes;
		count -= thisrun_bytes / block_size;
		wp += thisrun_bytes;
		if (wp >= fifo_end_addr)
			wp = fifo_start_addr;

		/* Store updated write pointer to target */
		retval = target_write_u32(target, wp_addr, wp);
		if (retval != ERROR_OK)
			break;

		/* Avoid GDB timeouts */
		keep_alive();
	}

	if (retval != ERROR_OK) {
		/* abort flash write algorithm on target */
		target_write_u32(target, wp_addr, 0);
	}

	int retval2 = target_wait_algorithm(target, num_mem_params, mem_params,
			num_reg_params, reg_params,
			exit_point,
			10000,
			arch_info);

	if (retval2 != ERROR_OK) {
		LOG_ERROR("error waiting for target flash write algorithm");
		retval = retval2;
	}

	if (retval == ERROR_OK) {
		/* check if algorithm set rp = 0 after fifo writer loop finished */
		retval = target_read_u32(target, rp_addr, &rp);
		if (retval == ERROR_OK && rp == 0) {
			LOG_ERROR("flash write algorithm aborted by target");
			retval = ERROR_FLASH_OPERATION_FAILED;
		}
	}

	return retval;
}

int target_run_read_async_algorithm(struct target *target,
		uint8_t *buffer, uint32_t count, int block_size,
		int num_mem_params, struct mem_param *mem_params,
		int num_reg_params, struct reg_param *reg_params,
		uint32_t buffer_start, uint32_t buffer_size,
		uint32_t entry_point, uint32_t exit_point, void *arch_info)
{
	int retval;
	int timeout = 0;

	const uint8_t *buffer_orig = buffer;

	/* Set up working area. First word is write pointer, second word is read pointer,
	 * rest is fifo data area. */
	uint32_t wp_addr = buffer_start;
	uint32_t rp_addr = buffer_start + 4;
	uint32_t fifo_start_addr = buffer_start + 8;
	uint32_t fifo_end_addr = buffer_start + buffer_size;

	uint32_t wp = fifo_start_addr;
	uint32_t rp = fifo_start_addr;

	/* validate block_size is 2^n */
	assert(IS_PWR_OF_2(block_size));

	retval = target_write_u32(target, wp_addr, wp);
	if (retval != ERROR_OK)
		return retval;
	retval = target_write_u32(target, rp_addr, rp);
	if (retval != ERROR_OK)
		return retval;

	/* Start up algorithm on target */
	retval = target_start_algorithm(target, num_mem_params, mem_params,
			num_reg_params, reg_params,
			entry_point,
			exit_point,
			arch_info);

	if (retval != ERROR_OK) {
		LOG_ERROR("error starting target flash read algorithm");
		return retval;
	}

	while (count > 0) {
		retval = target_read_u32(target, wp_addr, &wp);
		if (retval != ERROR_OK) {
			LOG_ERROR("failed to get write pointer");
			break;
		}

		LOG_DEBUG("offs 0x%zx count 0x%" PRIx32 " wp 0x%" PRIx32 " rp 0x%" PRIx32,
			(size_t)(buffer - buffer_orig), count, wp, rp);

		if (wp == 0) {
			LOG_ERROR("flash read algorithm aborted by target");
			retval = ERROR_FLASH_OPERATION_FAILED;
			break;
		}

		if (!IS_ALIGNED(wp - fifo_start_addr, block_size) || wp < fifo_start_addr || wp >= fifo_end_addr) {
			LOG_ERROR("corrupted fifo write pointer 0x%" PRIx32, wp);
			break;
		}

		/* Count the number of bytes available in the fifo without
		 * crossing the wrap around. */
		uint32_t thisrun_bytes;
		if (wp >= rp)
			thisrun_bytes = wp - rp;
		else
			thisrun_bytes = fifo_end_addr - rp;

		if (thisrun_bytes == 0) {
			/* Throttle polling a bit if transfer is (much) faster than flash
			 * reading. The exact delay shouldn't matter as long as it's
			 * less than buffer size / flash speed. This is very unlikely to
			 * run when using high latency connections such as USB. */
			alive_sleep(2);

			/* to stop an infinite loop on some targets check and increment a timeout
			 * this issue was observed on a stellaris using the new ICDI interface */
			if (timeout++ >= 2500) {
				LOG_ERROR("timeout waiting for algorithm, a target reset is recommended");
				return ERROR_FLASH_OPERATION_FAILED;
			}
			continue;
		}

		/* Reset our timeout */
		timeout = 0;

		/* Limit to the amount of data we actually want to read */
		if (thisrun_bytes > count * block_size)
			thisrun_bytes = count * block_size;

		/* Force end of large blocks to be word aligned */
		if (thisrun_bytes >= 16)
			thisrun_bytes -= (rp + thisrun_bytes) & 0x03;

		/* Read data from fifo */
		retval = target_read_buffer(target, rp, thisrun_bytes, buffer);
		if (retval != ERROR_OK)
			break;

		/* Update counters and wrap write pointer */
		buffer += thisrun_bytes;
		count -= thisrun_bytes / block_size;
		rp += thisrun_bytes;
		if (rp >= fifo_end_addr)
			rp = fifo_start_addr;

		/* Store updated write pointer to target */
		retval = target_write_u32(target, rp_addr, rp);
		if (retval != ERROR_OK)
			break;

		/* Avoid GDB timeouts */
		keep_alive();

	}

	if (retval != ERROR_OK) {
		/* abort flash write algorithm on target */
		target_write_u32(target, rp_addr, 0);
	}

	int retval2 = target_wait_algorithm(target, num_mem_params, mem_params,
			num_reg_params, reg_params,
			exit_point,
			10000,
			arch_info);

	if (retval2 != ERROR_OK) {
		LOG_ERROR("error waiting for target flash write algorithm");
		retval = retval2;
	}

	if (retval == ERROR_OK) {
		/* check if algorithm set wp = 0 after fifo writer loop finished */
		retval = target_read_u32(target, wp_addr, &wp);
		if (retval == ERROR_OK && wp == 0) {
			LOG_ERROR("flash read algorithm aborted by target");
			retval = ERROR_FLASH_OPERATION_FAILED;
		}
	}

	return retval;
}

int target_read_memory(struct target *target,
		target_addr_t address, uint32_t size, uint32_t count, uint8_t *buffer)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->read_memory) {
		LOG_ERROR("Target %s doesn't support read_memory", target_name(target));
		return ERROR_FAIL;
	}
	return target->type->read_memory(target, address, size, count, buffer);
}

int target_read_phys_memory(struct target *target,
		target_addr_t address, uint32_t size, uint32_t count, uint8_t *buffer)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->read_phys_memory) {
		LOG_ERROR("Target %s doesn't support read_phys_memory", target_name(target));
		return ERROR_FAIL;
	}
	return target->type->read_phys_memory(target, address, size, count, buffer);
}

int target_write_memory(struct target *target,
		target_addr_t address, uint32_t size, uint32_t count, const uint8_t *buffer)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->write_memory) {
		LOG_ERROR("Target %s doesn't support write_memory", target_name(target));
		return ERROR_FAIL;
	}
	return target->type->write_memory(target, address, size, count, buffer);
}

int target_write_phys_memory(struct target *target,
		target_addr_t address, uint32_t size, uint32_t count, const uint8_t *buffer)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->write_phys_memory) {
		LOG_ERROR("Target %s doesn't support write_phys_memory", target_name(target));
		return ERROR_FAIL;
	}
	return target->type->write_phys_memory(target, address, size, count, buffer);
}

int target_add_breakpoint(struct target *target,
		struct breakpoint *breakpoint)
{
	if ((target->state != TARGET_HALTED) && (breakpoint->type != BKPT_HARD)) {
		LOG_WARNING("target %s is not halted (add breakpoint)", target_name(target));
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->add_breakpoint(target, breakpoint);
}

int target_add_context_breakpoint(struct target *target,
		struct breakpoint *breakpoint)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (add context breakpoint)", target_name(target));
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->add_context_breakpoint(target, breakpoint);
}

int target_add_hybrid_breakpoint(struct target *target,
		struct breakpoint *breakpoint)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (add hybrid breakpoint)", target_name(target));
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->add_hybrid_breakpoint(target, breakpoint);
}

int target_remove_breakpoint(struct target *target,
		struct breakpoint *breakpoint)
{
	return target->type->remove_breakpoint(target, breakpoint);
}

int target_add_watchpoint(struct target *target,
		struct watchpoint *watchpoint)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (add watchpoint)", target_name(target));
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->add_watchpoint(target, watchpoint);
}
int target_remove_watchpoint(struct target *target,
		struct watchpoint *watchpoint)
{
	return target->type->remove_watchpoint(target, watchpoint);
}
int target_hit_watchpoint(struct target *target,
		struct watchpoint **hit_watchpoint)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (hit watchpoint)", target->cmd_name);
		return ERROR_TARGET_NOT_HALTED;
	}

	if (!target->type->hit_watchpoint) {
		/* For backward compatible, if hit_watchpoint is not implemented,
		 * return ERROR_FAIL such that gdb_server will not take the nonsense
		 * information. */
		return ERROR_FAIL;
	}

	return target->type->hit_watchpoint(target, hit_watchpoint);
}

const char *target_get_gdb_arch(struct target *target)
{
	if (!target->type->get_gdb_arch)
		return NULL;
	return target->type->get_gdb_arch(target);
}

int target_get_gdb_reg_list(struct target *target,
		struct reg **reg_list[], int *reg_list_size,
		enum target_register_class reg_class)
{
	int result = ERROR_FAIL;

	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		goto done;
	}

	result = target->type->get_gdb_reg_list(target, reg_list,
			reg_list_size, reg_class);

done:
	if (result != ERROR_OK) {
		*reg_list = NULL;
		*reg_list_size = 0;
	}
	return result;
}

int target_get_gdb_reg_list_noread(struct target *target,
		struct reg **reg_list[], int *reg_list_size,
		enum target_register_class reg_class)
{
	if (target->type->get_gdb_reg_list_noread &&
			target->type->get_gdb_reg_list_noread(target, reg_list,
				reg_list_size, reg_class) == ERROR_OK)
		return ERROR_OK;
	return target_get_gdb_reg_list(target, reg_list, reg_list_size, reg_class);
}

bool target_supports_gdb_connection(struct target *target)
{
	/*
	 * exclude all the targets that don't provide get_gdb_reg_list
	 * or that have explicit gdb_max_connection == 0
	 */
	return !!target->type->get_gdb_reg_list && !!target->gdb_max_connections;
}

int target_step(struct target *target,
		int current, target_addr_t address, int handle_breakpoints)
{
	int retval;

	target_call_event_callbacks(target, TARGET_EVENT_STEP_START);

	retval = target->type->step(target, current, address, handle_breakpoints);
	if (retval != ERROR_OK)
		return retval;

	target_call_event_callbacks(target, TARGET_EVENT_STEP_END);

	return retval;
}

int target_get_gdb_fileio_info(struct target *target, struct gdb_fileio_info *fileio_info)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (gdb fileio)", target->cmd_name);
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->get_gdb_fileio_info(target, fileio_info);
}

int target_gdb_fileio_end(struct target *target, int retcode, int fileio_errno, bool ctrl_c)
{
	if (target->state != TARGET_HALTED) {
		LOG_WARNING("target %s is not halted (gdb fileio end)", target->cmd_name);
		return ERROR_TARGET_NOT_HALTED;
	}
	return target->type->gdb_fileio_end(target, retcode, fileio_errno, ctrl_c);
}

target_addr_t target_address_max(struct target *target)
{
	unsigned bits = target_address_bits(target);
	if (sizeof(target_addr_t) * 8 == bits)
		return (target_addr_t) -1;
	else
		return (((target_addr_t) 1) << bits) - 1;
}

unsigned target_address_bits(struct target *target)
{
	if (target->type->address_bits)
		return target->type->address_bits(target);
	return 32;
}

unsigned int target_data_bits(struct target *target)
{
	if (target->type->data_bits)
		return target->type->data_bits(target);
	return 32;
}

static int target_profiling(struct target *target, uint32_t *samples,
			uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds)
{
	return target->type->profiling(target, samples, max_num_samples,
			num_samples, seconds);
}

static int handle_target(void *priv);

static int target_init_one(struct command_context *cmd_ctx,
		struct target *target)
{
	target_reset_examined(target);

	struct target_type *type = target->type;
	if (!type->examine)
		type->examine = default_examine;

	if (!type->check_reset)
		type->check_reset = default_check_reset;

	assert(type->init_target);

	int retval = type->init_target(cmd_ctx, target);
	if (retval != ERROR_OK) {
		LOG_ERROR("target '%s' init failed", target_name(target));
		return retval;
	}

	/* Sanity-check MMU support ... stub in what we must, to help
	 * implement it in stages, but warn if we need to do so.
	 */
	if (type->mmu) {
		if (!type->virt2phys) {
			LOG_ERROR("type '%s' is missing virt2phys", type->name);
			type->virt2phys = identity_virt2phys;
		}
	} else {
		/* Make sure no-MMU targets all behave the same:  make no
		 * distinction between physical and virtual addresses, and
		 * ensure that virt2phys() is always an identity mapping.
		 */
		if (type->write_phys_memory || type->read_phys_memory || type->virt2phys)
			LOG_WARNING("type '%s' has bad MMU hooks", type->name);

		type->mmu = no_mmu;
		type->write_phys_memory = type->write_memory;
		type->read_phys_memory = type->read_memory;
		type->virt2phys = identity_virt2phys;
	}

	if (!target->type->read_buffer)
		target->type->read_buffer = target_read_buffer_default;

	if (!target->type->write_buffer)
		target->type->write_buffer = target_write_buffer_default;

	if (!target->type->get_gdb_fileio_info)
		target->type->get_gdb_fileio_info = target_get_gdb_fileio_info_default;

	if (!target->type->gdb_fileio_end)
		target->type->gdb_fileio_end = target_gdb_fileio_end_default;

	if (!target->type->profiling)
		target->type->profiling = target_profiling_default;

	return ERROR_OK;
}

static int target_init(struct command_context *cmd_ctx)
{
	struct target *target;
	int retval;

	for (target = all_targets; target; target = target->next) {
		retval = target_init_one(cmd_ctx, target);
		if (retval != ERROR_OK)
			return retval;
	}

	if (!all_targets)
		return ERROR_OK;

	retval = target_register_user_commands(cmd_ctx);
	if (retval != ERROR_OK)
		return retval;

	retval = target_register_timer_callback(&handle_target,
			polling_interval, TARGET_TIMER_TYPE_PERIODIC, cmd_ctx->interp);
	if (retval != ERROR_OK)
		return retval;

	return ERROR_OK;
}

COMMAND_HANDLER(handle_target_init_command)
{
	int retval;

	if (CMD_ARGC != 0)
		return ERROR_COMMAND_SYNTAX_ERROR;

	static bool target_initialized;
	if (target_initialized) {
		LOG_INFO("'target init' has already been called");
		return ERROR_OK;
	}
	target_initialized = true;

	retval = command_run_line(CMD_CTX, "init_targets");
	if (retval != ERROR_OK)
		return retval;

	retval = command_run_line(CMD_CTX, "init_target_events");
	if (retval != ERROR_OK)
		return retval;

	retval = command_run_line(CMD_CTX, "init_board");
	if (retval != ERROR_OK)
		return retval;

	LOG_DEBUG("Initializing targets...");
	return target_init(CMD_CTX);
}

int target_register_event_callback(int (*callback)(struct target *target,
		enum target_event event, void *priv), void *priv)
{
	struct target_event_callback **callbacks_p = &target_event_callbacks;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	if (*callbacks_p) {
		while ((*callbacks_p)->next)
			callbacks_p = &((*callbacks_p)->next);
		callbacks_p = &((*callbacks_p)->next);
	}

	(*callbacks_p) = malloc(sizeof(struct target_event_callback));
	(*callbacks_p)->callback = callback;
	(*callbacks_p)->priv = priv;
	(*callbacks_p)->next = NULL;

	return ERROR_OK;
}

int target_register_reset_callback(int (*callback)(struct target *target,
		enum target_reset_mode reset_mode, void *priv), void *priv)
{
	struct target_reset_callback *entry;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	entry = malloc(sizeof(struct target_reset_callback));
	if (!entry) {
		LOG_ERROR("error allocating buffer for reset callback entry");
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	entry->callback = callback;
	entry->priv = priv;
	list_add(&entry->list, &target_reset_callback_list);


	return ERROR_OK;
}

int target_register_trace_callback(int (*callback)(struct target *target,
		size_t len, uint8_t *data, void *priv), void *priv)
{
	struct target_trace_callback *entry;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	entry = malloc(sizeof(struct target_trace_callback));
	if (!entry) {
		LOG_ERROR("error allocating buffer for trace callback entry");
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	entry->callback = callback;
	entry->priv = priv;
	list_add(&entry->list, &target_trace_callback_list);


	return ERROR_OK;
}

int target_register_timer_callback(int (*callback)(void *priv),
		unsigned int time_ms, enum target_timer_type type, void *priv)
{
	struct target_timer_callback **callbacks_p = &target_timer_callbacks;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	if (*callbacks_p) {
		while ((*callbacks_p)->next)
			callbacks_p = &((*callbacks_p)->next);
		callbacks_p = &((*callbacks_p)->next);
	}

	(*callbacks_p) = malloc(sizeof(struct target_timer_callback));
	(*callbacks_p)->callback = callback;
	(*callbacks_p)->type = type;
	(*callbacks_p)->time_ms = time_ms;
	(*callbacks_p)->removed = false;

	(*callbacks_p)->when = timeval_ms() + time_ms;
	target_timer_next_event_value = MIN(target_timer_next_event_value, (*callbacks_p)->when);

	(*callbacks_p)->priv = priv;
	(*callbacks_p)->next = NULL;

	return ERROR_OK;
}

int target_unregister_event_callback(int (*callback)(struct target *target,
		enum target_event event, void *priv), void *priv)
{
	struct target_event_callback **p = &target_event_callbacks;
	struct target_event_callback *c = target_event_callbacks;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	while (c) {
		struct target_event_callback *next = c->next;
		if ((c->callback == callback) && (c->priv == priv)) {
			*p = next;
			free(c);
			return ERROR_OK;
		} else
			p = &(c->next);
		c = next;
	}

	return ERROR_OK;
}

int target_unregister_reset_callback(int (*callback)(struct target *target,
		enum target_reset_mode reset_mode, void *priv), void *priv)
{
	struct target_reset_callback *entry;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	list_for_each_entry(entry, &target_reset_callback_list, list) {
		if (entry->callback == callback && entry->priv == priv) {
			list_del(&entry->list);
			free(entry);
			break;
		}
	}

	return ERROR_OK;
}

int target_unregister_trace_callback(int (*callback)(struct target *target,
		size_t len, uint8_t *data, void *priv), void *priv)
{
	struct target_trace_callback *entry;

	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	list_for_each_entry(entry, &target_trace_callback_list, list) {
		if (entry->callback == callback && entry->priv == priv) {
			list_del(&entry->list);
			free(entry);
			break;
		}
	}

	return ERROR_OK;
}

int target_unregister_timer_callback(int (*callback)(void *priv), void *priv)
{
	if (!callback)
		return ERROR_COMMAND_SYNTAX_ERROR;

	for (struct target_timer_callback *c = target_timer_callbacks;
	     c; c = c->next) {
		if ((c->callback == callback) && (c->priv == priv)) {
			c->removed = true;
			return ERROR_OK;
		}
	}

	return ERROR_FAIL;
}

int target_call_event_callbacks(struct target *target, enum target_event event)
{
	struct target_event_callback *callback = target_event_callbacks;
	struct target_event_callback *next_callback;

	if (event == TARGET_EVENT_HALTED) {
		/* execute early halted first */
		target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
	}

	LOG_DEBUG("target event %i (%s) for core %s", event,
			target_event_name(event),
			target_name(target));

	target_handle_event(target, event);

	while (callback) {
		next_callback = callback->next;
		callback->callback(target, event, callback->priv);
		callback = next_callback;
	}

	return ERROR_OK;
}

int target_call_reset_callbacks(struct target *target, enum target_reset_mode reset_mode)
{
	struct target_reset_callback *callback;

	LOG_DEBUG("target reset %i (%s)", reset_mode,
			jim_nvp_value2name_simple(nvp_reset_modes, reset_mode)->name);

	list_for_each_entry(callback, &target_reset_callback_list, list)
		callback->callback(target, reset_mode, callback->priv);

	return ERROR_OK;
}

int target_call_trace_callbacks(struct target *target, size_t len, uint8_t *data)
{
	struct target_trace_callback *callback;

	list_for_each_entry(callback, &target_trace_callback_list, list)
		callback->callback(target, len, data, callback->priv);

	return ERROR_OK;
}

static int target_timer_callback_periodic_restart(
		struct target_timer_callback *cb, int64_t *now)
{
	cb->when = *now + cb->time_ms;
	return ERROR_OK;
}

static int target_call_timer_callback(struct target_timer_callback *cb,
		int64_t *now)
{
	cb->callback(cb->priv);

	if (cb->type == TARGET_TIMER_TYPE_PERIODIC)
		return target_timer_callback_periodic_restart(cb, now);

	return target_unregister_timer_callback(cb->callback, cb->priv);
}

static int target_call_timer_callbacks_check_time(int checktime)
{
	static bool callback_processing;

	/* Do not allow nesting */
	if (callback_processing)
		return ERROR_OK;

	callback_processing = true;

	keep_alive();

	int64_t now = timeval_ms();

	/* Initialize to a default value that's a ways into the future.
	 * The loop below will make it closer to now if there are
	 * callbacks that want to be called sooner. */
	target_timer_next_event_value = now + 1000;

	/* Store an address of the place containing a pointer to the
	 * next item; initially, that's a standalone "root of the
	 * list" variable. */
	struct target_timer_callback **callback = &target_timer_callbacks;
	while (callback && *callback) {
		if ((*callback)->removed) {
			struct target_timer_callback *p = *callback;
			*callback = (*callback)->next;
			free(p);
			continue;
		}

		bool call_it = (*callback)->callback &&
			((!checktime && (*callback)->type == TARGET_TIMER_TYPE_PERIODIC) ||
			 now >= (*callback)->when);

		if (call_it)
			target_call_timer_callback(*callback, &now);

		if (!(*callback)->removed && (*callback)->when < target_timer_next_event_value)
			target_timer_next_event_value = (*callback)->when;

		callback = &(*callback)->next;
	}

	callback_processing = false;
	return ERROR_OK;
}

int target_call_timer_callbacks()
{
	return target_call_timer_callbacks_check_time(1);
}

/* invoke periodic callbacks immediately */
int target_call_timer_callbacks_now()
{
	return target_call_timer_callbacks_check_time(0);
}

int64_t target_timer_next_event(void)
{
	return target_timer_next_event_value;
}

/* Prints the working area layout for debug purposes */
static void print_wa_layout(struct target *target)
{
	struct working_area *c = target->working_areas;

	while (c) {
		LOG_DEBUG("%c%c " TARGET_ADDR_FMT "-" TARGET_ADDR_FMT " (%" PRIu32 " bytes)",
			c->backup ? 'b' : ' ', c->free ? ' ' : '*',
			c->address, c->address + c->size - 1, c->size);
		c = c->next;
	}
}

/* Reduce area to size bytes, create a new free area from the remaining bytes, if any. */
static void target_split_working_area(struct working_area *area, uint32_t size)
{
	assert(area->free); /* Shouldn't split an allocated area */
	assert(size <= area->size); /* Caller should guarantee this */

	/* Split only if not already the right size */
	if (size < area->size) {
		struct working_area *new_wa = malloc(sizeof(*new_wa));

		if (!new_wa)
			return;

		new_wa->next = area->next;
		new_wa->size = area->size - size;
		new_wa->address = area->address + size;
		new_wa->backup = NULL;
		new_wa->user = NULL;
		new_wa->free = true;

		area->next = new_wa;
		area->size = size;

		/* If backup memory was allocated to this area, it has the wrong size
		 * now so free it and it will be reallocated if/when needed */
		free(area->backup);
		area->backup = NULL;
	}
}

/* Merge all adjacent free areas into one */
static void target_merge_working_areas(struct target *target)
{
	struct working_area *c = target->working_areas;

	while (c && c->next) {
		assert(c->next->address == c->address + c->size); /* This is an invariant */

		/* Find two adjacent free areas */
		if (c->free && c->next->free) {
			/* Merge the last into the first */
			c->size += c->next->size;

			/* Remove the last */
			struct working_area *to_be_freed = c->next;
			c->next = c->next->next;
			free(to_be_freed->backup);
			free(to_be_freed);

			/* If backup memory was allocated to the remaining area, it's has
			 * the wrong size now */
			free(c->backup);
			c->backup = NULL;
		} else {
			c = c->next;
		}
	}
}

int target_alloc_working_area_try(struct target *target, uint32_t size, struct working_area **area)
{
	/* Reevaluate working area address based on MMU state*/
	if (!target->working_areas) {
		int retval;
		int enabled;

		retval = target->type->mmu(target, &enabled);
		if (retval != ERROR_OK)
			return retval;

		if (!enabled) {
			if (target->working_area_phys_spec) {
				LOG_DEBUG("MMU disabled, using physical "
					"address for working memory " TARGET_ADDR_FMT,
					target->working_area_phys);
				target->working_area = target->working_area_phys;
			} else {
				LOG_ERROR("No working memory available. "
					"Specify -work-area-phys to target.");
				return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
			}
		} else {
			if (target->working_area_virt_spec) {
				LOG_DEBUG("MMU enabled, using virtual "
					"address for working memory " TARGET_ADDR_FMT,
					target->working_area_virt);
				target->working_area = target->working_area_virt;
			} else {
				LOG_ERROR("No working memory available. "
					"Specify -work-area-virt to target.");
				return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
			}
		}

		/* Set up initial working area on first call */
		struct working_area *new_wa = malloc(sizeof(*new_wa));
		if (new_wa) {
			new_wa->next = NULL;
			new_wa->size = target->working_area_size & ~3UL; /* 4-byte align */
			new_wa->address = target->working_area;
			new_wa->backup = NULL;
			new_wa->user = NULL;
			new_wa->free = true;
		}

		target->working_areas = new_wa;
	}

	/* only allocate multiples of 4 byte */
	if (size % 4)
		size = (size + 3) & (~3UL);

	struct working_area *c = target->working_areas;

	/* Find the first large enough working area */
	while (c) {
		if (c->free && c->size >= size)
			break;
		c = c->next;
	}

	if (!c)
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	/* Split the working area into the requested size */
	target_split_working_area(c, size);

	LOG_DEBUG("allocated new working area of %" PRIu32 " bytes at address " TARGET_ADDR_FMT,
			  size, c->address);

	if (target->backup_working_area) {
		if (!c->backup) {
			c->backup = malloc(c->size);
			if (!c->backup)
				return ERROR_FAIL;
		}

		int retval = target_read_memory(target, c->address, 4, c->size / 4, c->backup);
		if (retval != ERROR_OK)
			return retval;
	}

	/* mark as used, and return the new (reused) area */
	c->free = false;
	*area = c;

	/* user pointer */
	c->user = area;

	print_wa_layout(target);

	return ERROR_OK;
}

int target_alloc_working_area(struct target *target, uint32_t size, struct working_area **area)
{
	int retval;

	retval = target_alloc_working_area_try(target, size, area);
	if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
		LOG_WARNING("not enough working area available(requested %"PRIu32")", size);
	return retval;

}

static int target_restore_working_area(struct target *target, struct working_area *area)
{
	int retval = ERROR_OK;

	if (target->backup_working_area && area->backup) {
		retval = target_write_memory(target, area->address, 4, area->size / 4, area->backup);
		if (retval != ERROR_OK)
			LOG_ERROR("failed to restore %" PRIu32 " bytes of working area at address " TARGET_ADDR_FMT,
					area->size, area->address);
	}

	return retval;
}

/* Restore the area's backup memory, if any, and return the area to the allocation pool */
static int target_free_working_area_restore(struct target *target, struct working_area *area, int restore)
{
	if (!area || area->free)
		return ERROR_OK;

	int retval = ERROR_OK;
	if (restore) {
		retval = target_restore_working_area(target, area);
		/* REVISIT: Perhaps the area should be freed even if restoring fails. */
		if (retval != ERROR_OK)
			return retval;
	}

	area->free = true;

	LOG_DEBUG("freed %" PRIu32 " bytes of working area at address " TARGET_ADDR_FMT,
			area->size, area->address);

	/* mark user pointer invalid */
	/* TODO: Is this really safe? It points to some previous caller's memory.
	 * How could we know that the area pointer is still in that place and not
	 * some other vital data? What's the purpose of this, anyway? */
	*area->user = NULL;
	area->user = NULL;

	target_merge_working_areas(target);

	print_wa_layout(target);

	return retval;
}

int target_free_working_area(struct target *target, struct working_area *area)
{
	return target_free_working_area_restore(target, area, 1);
}

/* free resources and restore memory, if restoring memory fails,
 * free up resources anyway
 */
static void target_free_all_working_areas_restore(struct target *target, int restore)
{
	struct working_area *c = target->working_areas;

	LOG_DEBUG("freeing all working areas");

	/* Loop through all areas, restoring the allocated ones and marking them as free */
	while (c) {
		if (!c->free) {
			if (restore)
				target_restore_working_area(target, c);
			c->free = true;
			*c->user = NULL; /* Same as above */
			c->user = NULL;
		}
		c = c->next;
	}

	/* Run a merge pass to combine all areas into one */
	target_merge_working_areas(target);

	print_wa_layout(target);
}

void target_free_all_working_areas(struct target *target)
{
	target_free_all_working_areas_restore(target, 1);

	/* Now we have none or only one working area marked as free */
	if (target->working_areas) {
		/* Free the last one to allow on-the-fly moving and resizing */
		free(target->working_areas->backup);
		free(target->working_areas);
		target->working_areas = NULL;
	}
}

/* Find the largest number of bytes that can be allocated */
uint32_t target_get_working_area_avail(struct target *target)
{
	struct working_area *c = target->working_areas;
	uint32_t max_size = 0;

	if (!c)
		return target->working_area_size;

	while (c) {
		if (c->free && max_size < c->size)
			max_size = c->size;

		c = c->next;
	}

	return max_size;
}

static void target_destroy(struct target *target)
{
	if (target->type->deinit_target)
		target->type->deinit_target(target);

	if (target->semihosting)
		free(target->semihosting->basedir);
	free(target->semihosting);

	jtag_unregister_event_callback(jtag_enable_callback, target);

	struct target_event_action *teap = target->event_action;
	while (teap) {
		struct target_event_action *next = teap->next;
		Jim_DecrRefCount(teap->interp, teap->body);
		free(teap);
		teap = next;
	}

	target_free_all_working_areas(target);

	/* release the targets SMP list */
	if (target->smp) {
		struct target_list *head, *tmp;

		list_for_each_entry_safe(head, tmp, target->smp_targets, lh) {
			list_del(&head->lh);
			head->target->smp = 0;
			free(head);
		}
		if (target->smp_targets != &empty_smp_targets)
			free(target->smp_targets);
		target->smp = 0;
	}

	rtos_destroy(target);

	free(target->gdb_port_override);
	free(target->type);
	free(target->trace_info);
	free(target->fileio_info);
	free(target->cmd_name);
	free(target);
}

void target_quit(void)
{
	struct target_event_callback *pe = target_event_callbacks;
	while (pe) {
		struct target_event_callback *t = pe->next;
		free(pe);
		pe = t;
	}
	target_event_callbacks = NULL;

	struct target_timer_callback *pt = target_timer_callbacks;
	while (pt) {
		struct target_timer_callback *t = pt->next;
		free(pt);
		pt = t;
	}
	target_timer_callbacks = NULL;

	for (struct target *target = all_targets; target;) {
		struct target *tmp;

		tmp = target->next;
		target_destroy(target);
		target = tmp;
	}

	all_targets = NULL;
}

int target_arch_state(struct target *target)
{
	int retval;
	if (!target) {
		LOG_WARNING("No target has been configured");
		return ERROR_OK;
	}

	if (target->state != TARGET_HALTED)
		return ERROR_OK;

	retval = target->type->arch_state(target);
	return retval;
}

static int target_get_gdb_fileio_info_default(struct target *target,
		struct gdb_fileio_info *fileio_info)
{
	/* If target does not support semi-hosting function, target
	   has no need to provide .get_gdb_fileio_info callback.
	   It just return ERROR_FAIL and gdb_server will return "Txx"
	   as target halted every time.  */
	return ERROR_FAIL;
}

static int target_gdb_fileio_end_default(struct target *target,
		int retcode, int fileio_errno, bool ctrl_c)
{
	return ERROR_OK;
}

int target_profiling_default(struct target *target, uint32_t *samples,
		uint32_t max_num_samples, uint32_t *num_samples, uint32_t seconds)
{
	struct timeval timeout, now;

	gettimeofday(&timeout, NULL);
	timeval_add_time(&timeout, seconds, 0);

	LOG_INFO("Starting profiling. Halting and resuming the"
			" target as often as we can...");

	uint32_t sample_count = 0;
	/* hopefully it is safe to cache! We want to stop/restart as quickly as possible. */
	struct reg *reg = register_get_by_name(target->reg_cache, "pc", true);

	int retval = ERROR_OK;
	for (;;) {
		target_poll(target);
		if (target->state == TARGET_HALTED) {
			uint32_t t = buf_get_u32(reg->value, 0, 32);
			samples[sample_count++] = t;
			/* current pc, addr = 0, do not handle breakpoints, not debugging */
			retval = target_resume(target, 1, 0, 0, 0);
			target_poll(target);
			alive_sleep(10); /* sleep 10ms, i.e. <100 samples/second. */
		} else if (target->state == TARGET_RUNNING) {
			/* We want to quickly sample the PC. */
			retval = target_halt(target);
		} else {
			LOG_INFO("Target not halted or running");
			retval = ERROR_OK;
			break;
		}

		if (retval != ERROR_OK)
			break;

		gettimeofday(&now, NULL);
		if ((sample_count >= max_num_samples) || timeval_compare(&now, &timeout) >= 0) {
			LOG_INFO("Profiling completed. %" PRIu32 " samples.", sample_count);
			break;
		}
	}

	*num_samples = sample_count;
	return retval;
}

/* Single aligned words are guaranteed to use 16 or 32 bit access
 * mode respectively, otherwise data is handled as quickly as
 * possible
 */
int target_write_buffer(struct target *target, target_addr_t address, uint32_t size, const uint8_t *buffer)
{
	LOG_DEBUG("writing buffer of %" PRIu32 " byte at " TARGET_ADDR_FMT,
			  size, address);

	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	if (size == 0)
		return ERROR_OK;

	if ((address + size - 1) < address) {
		/* GDB can request this when e.g. PC is 0xfffffffc */
		LOG_ERROR("address + size wrapped (" TARGET_ADDR_FMT ", 0x%08" PRIx32 ")",
				  address,
				  size);
		return ERROR_FAIL;
	}

	return target->type->write_buffer(target, address, size, buffer);
}

static int target_write_buffer_default(struct target *target,
	target_addr_t address, uint32_t count, const uint8_t *buffer)
{
	uint32_t size;
	unsigned int data_bytes = target_data_bits(target) / 8;

	/* Align up to maximum bytes. The loop condition makes sure the next pass
	 * will have something to do with the size we leave to it. */
	for (size = 1;
			size < data_bytes && count >= size * 2 + (address & size);
			size *= 2) {
		if (address & size) {
			int retval = target_write_memory(target, address, size, 1, buffer);
			if (retval != ERROR_OK)
				return retval;
			address += size;
			count -= size;
			buffer += size;
		}
	}

	/* Write the data with as large access size as possible. */
	for (; size > 0; size /= 2) {
		uint32_t aligned = count - count % size;
		if (aligned > 0) {
			int retval = target_write_memory(target, address, size, aligned / size, buffer);
			if (retval != ERROR_OK)
				return retval;
			address += aligned;
			count -= aligned;
			buffer += aligned;
		}
	}

	return ERROR_OK;
}

/* Single aligned words are guaranteed to use 16 or 32 bit access
 * mode respectively, otherwise data is handled as quickly as
 * possible
 */
int target_read_buffer(struct target *target, target_addr_t address, uint32_t size, uint8_t *buffer)
{
	LOG_DEBUG("reading buffer of %" PRIu32 " byte at " TARGET_ADDR_FMT,
			  size, address);

	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	if (size == 0)
		return ERROR_OK;

	if ((address + size - 1) < address) {
		/* GDB can request this when e.g. PC is 0xfffffffc */
		LOG_ERROR("address + size wrapped (" TARGET_ADDR_FMT ", 0x%08" PRIx32 ")",
				  address,
				  size);
		return ERROR_FAIL;
	}

	return target->type->read_buffer(target, address, size, buffer);
}

static int target_read_buffer_default(struct target *target, target_addr_t address, uint32_t count, uint8_t *buffer)
{
	uint32_t size;
	unsigned int data_bytes = target_data_bits(target) / 8;

	/* Align up to maximum bytes. The loop condition makes sure the next pass
	 * will have something to do with the size we leave to it. */
	for (size = 1;
			size < data_bytes && count >= size * 2 + (address & size);
			size *= 2) {
		if (address & size) {
			int retval = target_read_memory(target, address, size, 1, buffer);
			if (retval != ERROR_OK)
				return retval;
			address += size;
			count -= size;
			buffer += size;
		}
	}

	/* Read the data with as large access size as possible. */
	for (; size > 0; size /= 2) {
		uint32_t aligned = count - count % size;
		if (aligned > 0) {
			int retval = target_read_memory(target, address, size, aligned / size, buffer);
			if (retval != ERROR_OK)
				return retval;
			address += aligned;
			count -= aligned;
			buffer += aligned;
		}
	}

	return ERROR_OK;
}

int target_checksum_memory(struct target *target, target_addr_t address, uint32_t size, uint32_t *crc)
{
	uint8_t *buffer;
	int retval;
	uint32_t i;
	uint32_t checksum = 0;
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}
	if (!target->type->checksum_memory) {
		LOG_ERROR("Target %s doesn't support checksum_memory", target_name(target));
		return ERROR_FAIL;
	}

	retval = target->type->checksum_memory(target, address, size, &checksum);
	if (retval != ERROR_OK) {
		buffer = malloc(size);
		if (!buffer) {
			LOG_ERROR("error allocating buffer for section (%" PRIu32 " bytes)", size);
			return ERROR_COMMAND_SYNTAX_ERROR;
		}
		retval = target_read_buffer(target, address, size, buffer);
		if (retval != ERROR_OK) {
			free(buffer);
			return retval;
		}

		/* convert to target endianness */
		for (i = 0; i < (size/sizeof(uint32_t)); i++) {
			uint32_t target_data;
			target_data = target_buffer_get_u32(target, &buffer[i*sizeof(uint32_t)]);
			target_buffer_set_u32(target, &buffer[i*sizeof(uint32_t)], target_data);
		}

		retval = image_calculate_checksum(buffer, size, &checksum);
		free(buffer);
	}

	*crc = checksum;

	return retval;
}

int target_blank_check_memory(struct target *target,
	struct target_memory_check_block *blocks, int num_blocks,
	uint8_t erased_value)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	if (!target->type->blank_check_memory)
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	return target->type->blank_check_memory(target, blocks, num_blocks, erased_value);
}

int target_read_u64(struct target *target, target_addr_t address, uint64_t *value)
{
	uint8_t value_buf[8];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	int retval = target_read_memory(target, address, 8, 1, value_buf);

	if (retval == ERROR_OK) {
		*value = target_buffer_get_u64(target, value_buf);
		LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%16.16" PRIx64 "",
				  address,
				  *value);
	} else {
		*value = 0x0;
		LOG_DEBUG("address: " TARGET_ADDR_FMT " failed",
				  address);
	}

	return retval;
}

int target_read_u32(struct target *target, target_addr_t address, uint32_t *value)
{
	uint8_t value_buf[4];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	int retval = target_read_memory(target, address, 4, 1, value_buf);

	if (retval == ERROR_OK) {
		*value = target_buffer_get_u32(target, value_buf);
		LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%8.8" PRIx32 "",
				  address,
				  *value);
	} else {
		*value = 0x0;
		LOG_DEBUG("address: " TARGET_ADDR_FMT " failed",
				  address);
	}

	return retval;
}

int target_read_u16(struct target *target, target_addr_t address, uint16_t *value)
{
	uint8_t value_buf[2];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	int retval = target_read_memory(target, address, 2, 1, value_buf);

	if (retval == ERROR_OK) {
		*value = target_buffer_get_u16(target, value_buf);
		LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%4.4" PRIx16,
				  address,
				  *value);
	} else {
		*value = 0x0;
		LOG_DEBUG("address: " TARGET_ADDR_FMT " failed",
				  address);
	}

	return retval;
}

int target_read_u8(struct target *target, target_addr_t address, uint8_t *value)
{
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	int retval = target_read_memory(target, address, 1, 1, value);

	if (retval == ERROR_OK) {
		LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%2.2" PRIx8,
				  address,
				  *value);
	} else {
		*value = 0x0;
		LOG_DEBUG("address: " TARGET_ADDR_FMT " failed",
				  address);
	}

	return retval;
}

int target_write_u64(struct target *target, target_addr_t address, uint64_t value)
{
	int retval;
	uint8_t value_buf[8];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%16.16" PRIx64 "",
			  address,
			  value);

	target_buffer_set_u64(target, value_buf, value);
	retval = target_write_memory(target, address, 8, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_u32(struct target *target, target_addr_t address, uint32_t value)
{
	int retval;
	uint8_t value_buf[4];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%8.8" PRIx32 "",
			  address,
			  value);

	target_buffer_set_u32(target, value_buf, value);
	retval = target_write_memory(target, address, 4, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_u16(struct target *target, target_addr_t address, uint16_t value)
{
	int retval;
	uint8_t value_buf[2];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%8.8" PRIx16,
			  address,
			  value);

	target_buffer_set_u16(target, value_buf, value);
	retval = target_write_memory(target, address, 2, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_u8(struct target *target, target_addr_t address, uint8_t value)
{
	int retval;
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%2.2" PRIx8,
			  address, value);

	retval = target_write_memory(target, address, 1, 1, &value);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_phys_u64(struct target *target, target_addr_t address, uint64_t value)
{
	int retval;
	uint8_t value_buf[8];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%16.16" PRIx64 "",
			  address,
			  value);

	target_buffer_set_u64(target, value_buf, value);
	retval = target_write_phys_memory(target, address, 8, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_phys_u32(struct target *target, target_addr_t address, uint32_t value)
{
	int retval;
	uint8_t value_buf[4];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%8.8" PRIx32 "",
			  address,
			  value);

	target_buffer_set_u32(target, value_buf, value);
	retval = target_write_phys_memory(target, address, 4, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_phys_u16(struct target *target, target_addr_t address, uint16_t value)
{
	int retval;
	uint8_t value_buf[2];
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%8.8" PRIx16,
			  address,
			  value);

	target_buffer_set_u16(target, value_buf, value);
	retval = target_write_phys_memory(target, address, 2, 1, value_buf);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

int target_write_phys_u8(struct target *target, target_addr_t address, uint8_t value)
{
	int retval;
	if (!target_was_examined(target)) {
		LOG_ERROR("Target not examined yet");
		return ERROR_FAIL;
	}

	LOG_DEBUG("address: " TARGET_ADDR_FMT ", value: 0x%2.2" PRIx8,
			  address, value);

	retval = target_write_phys_memory(target, address, 1, 1, &value);
	if (retval != ERROR_OK)
		LOG_DEBUG("failed: %i", retval);

	return retval;
}

static int find_target(struct command_invocation *cmd, const char *name)
{
	struct target *target = get_target(name);
	if (!target) {
		command_print(cmd, "Target: %s is unknown, try one of:\n", name);
		return ERROR_FAIL;
	}
	if (!target->tap->enabled) {
		command_print(cmd, "Target: TAP %s is disabled, "
			 "can't be the current target\n",
			 target->tap->dotted_name);
		return ERROR_FAIL;
	}

	cmd->ctx->current_target = target;
	if (cmd->ctx->current_target_override)
		cmd->ctx->current_target_override = target;

	return ERROR_OK;
}


COMMAND_HANDLER(handle_targets_command)
{
	int retval = ERROR_OK;
	if (CMD_ARGC == 1) {
		retval = find_target(CMD, CMD_ARGV[0]);
		if (retval == ERROR_OK) {
			/* we're done! */
			return retval;
		}
	}

	struct target *target = all_targets;
	command_print(CMD, "    TargetName         Type       Endian TapName            State       ");
	command_print(CMD, "--  ------------------ ---------- ------ ------------------ ------------");
	while (target) {
		const char *state;
		char marker = ' ';

		if (target->tap->enabled)
			state = target_state_name(target);
		else
			state = "tap-disabled";

		if (CMD_CTX->current_target == target)
			marker = '*';

		/* keep columns lined up to match the headers above */
		command_print(CMD,
				"%2d%c %-18s %-10s %-6s %-18s %s",
				target->target_number,
				marker,
				target_name(target),
				target_type_name(target),
				jim_nvp_value2name_simple(nvp_target_endian,
					target->endianness)->name,
				target->tap->dotted_name,
				state);
		target = target->next;
	}

	return retval;
}

/* every 300ms we check for reset & powerdropout and issue a "reset halt" if so. */

static int power_dropout;
static int srst_asserted;

static int run_power_restore;
static int run_power_dropout;
static int run_srst_asserted;
static int run_srst_deasserted;

static int sense_handler(void)
{
	static int prev_srst_asserted;
	static int prev_power_dropout;

	int retval = jtag_power_dropout(&power_dropout);
	if (retval != ERROR_OK)
		return retval;

	int power_restored;
	power_restored = prev_power_dropout && !power_dropout;
	if (power_restored)
		run_power_restore = 1;

	int64_t current = timeval_ms();
	static int64_t last_power;
	bool wait_more = last_power + 2000 > current;
	if (power_dropout && !wait_more) {
		run_power_dropout = 1;
		last_power = current;
	}

	retval = jtag_srst_asserted(&srst_asserted);
	if (retval != ERROR_OK)
		return retval;

	int srst_deasserted;
	srst_deasserted = prev_srst_asserted && !srst_asserted;

	static int64_t last_srst;
	wait_more = last_srst + 2000 > current;
	if (srst_deasserted && !wait_more) {
		run_srst_deasserted = 1;
		last_srst = current;
	}

	if (!prev_srst_asserted && srst_asserted)
		run_srst_asserted = 1;

	prev_srst_asserted = srst_asserted;
	prev_power_dropout = power_dropout;

	if (srst_deasserted || power_restored) {
		/* Other than logging the event we can't do anything here.
		 * Issuing a reset is a particularly bad idea as we might
		 * be inside a reset already.
		 */
	}

	return ERROR_OK;
}

/* process target state changes */
static int handle_target(void *priv)
{
	Jim_Interp *interp = (Jim_Interp *)priv;
	int retval = ERROR_OK;

	if (!is_jtag_poll_safe()) {
		/* polling is disabled currently */
		return ERROR_OK;
	}

	/* we do not want to recurse here... */
	static int recursive;
	if (!recursive) {
		recursive = 1;
		sense_handler();
		/* danger! running these procedures can trigger srst assertions and power dropouts.
		 * We need to avoid an infinite loop/recursion here and we do that by
		 * clearing the flags after running these events.
		 */
		int did_something = 0;
		if (run_srst_asserted) {
			LOG_INFO("srst asserted detected, running srst_asserted proc.");
			Jim_Eval(interp, "srst_asserted");
			did_something = 1;
		}
		if (run_srst_deasserted) {
			Jim_Eval(interp, "srst_deasserted");
			did_something = 1;
		}
		if (run_power_dropout) {
			LOG_INFO("Power dropout detected, running power_dropout proc.");
			Jim_Eval(interp, "power_dropout");
			did_something = 1;
		}
		if (run_power_restore) {
			Jim_Eval(interp, "power_restore");
			did_something = 1;
		}

		if (did_something) {
			/* clear detect flags */
			sense_handler();
		}

		/* clear action flags */

		run_srst_asserted = 0;
		run_srst_deasserted = 0;
		run_power_restore = 0;
		run_power_dropout = 0;

		recursive = 0;
	}

	/* Poll targets for state changes unless that's globally disabled.
	 * Skip targets that are currently disabled.
	 */
	for (struct target *target = all_targets;
			is_jtag_poll_safe() && target;
			target = target->next) {

		if (!target_was_examined(target))
			continue;

		if (!target->tap->enabled)
			continue;

		if (target->backoff.times > target->backoff.count) {
			/* do not poll this time as we failed previously */
			target->backoff.count++;
			continue;
		}
		target->backoff.count = 0;

		/* only poll target if we've got power and srst isn't asserted */
		if (!power_dropout && !srst_asserted) {
			/* polling may fail silently until the target has been examined */
			retval = target_poll(target);
			if (retval != ERROR_OK) {
				/* 100ms polling interval. Increase interval between polling up to 5000ms */
				if (target->backoff.times * polling_interval < 5000) {
					target->backoff.times *= 2;
					target->backoff.times++;
				}

				/* Tell GDB to halt the debugger. This allows the user to
				 * run monitor commands to handle the situation.
				 */
				target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
			}
			if (target->backoff.times > 0) {
				LOG_USER("Polling target %s failed, trying to reexamine", target_name(target));
				target_reset_examined(target);
				retval = target_examine_one(target);
				/* Target examination could have failed due to unstable connection,
				 * but we set the examined flag anyway to repoll it later */
				if (retval != ERROR_OK) {
					target_set_examined(target);
					LOG_USER("Examination failed, GDB will be halted. Polling again in %dms",
						 target->backoff.times * polling_interval);
					return retval;
				}
			}

			/* Since we succeeded, we reset backoff count */
			target->backoff.times = 0;
		}
	}

	return retval;
}

COMMAND_HANDLER(handle_reg_command)
{
	LOG_DEBUG("-");

	struct target *target = get_current_target(CMD_CTX);
	struct reg *reg = NULL;

	/* list all available registers for the current target */
	if (CMD_ARGC == 0) {
		struct reg_cache *cache = target->reg_cache;

		unsigned int count = 0;
		while (cache) {
			unsigned i;

			command_print(CMD, "===== %s", cache->name);

			for (i = 0, reg = cache->reg_list;
					i < cache->num_regs;
					i++, reg++, count++) {
				if (reg->exist == false || reg->hidden)
					continue;
				/* only print cached values if they are valid */
				if (reg->valid) {
					char *value = buf_to_hex_str(reg->value,
							reg->size);
					command_print(CMD,
							"(%i) %s (/%" PRIu32 "): 0x%s%s",
							count, reg->name,
							reg->size, value,
							reg->dirty
								? " (dirty)"
								: "");
					free(value);
				} else {
					command_print(CMD, "(%i) %s (/%" PRIu32 ")",
							  count, reg->name,
							  reg->size);
				}
			}
			cache = cache->next;
		}

		return ERROR_OK;
	}

	/* access a single register by its ordinal number */
	if ((CMD_ARGV[0][0] >= '0') && (CMD_ARGV[0][0] <= '9')) {
		unsigned num;
		COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], num);

		struct reg_cache *cache = target->reg_cache;
		unsigned int count = 0;
		while (cache) {
			unsigned i;
			for (i = 0; i < cache->num_regs; i++) {
				if (count++ == num) {
					reg = &cache->reg_list[i];
					break;
				}
			}
			if (reg)
				break;
			cache = cache->next;
		}

		if (!reg) {
			command_print(CMD, "%i is out of bounds, the current target "
					"has only %i registers (0 - %i)", num, count, count - 1);
			return ERROR_OK;
		}
	} else {
		/* access a single register by its name */
		reg = register_get_by_name(target->reg_cache, CMD_ARGV[0], true);

		if (!reg)
			goto not_found;
	}

	assert(reg); /* give clang a hint that we *know* reg is != NULL here */

	if (!reg->exist)
		goto not_found;

	/* display a register */
	if ((CMD_ARGC == 1) || ((CMD_ARGC == 2) && !((CMD_ARGV[1][0] >= '0')
			&& (CMD_ARGV[1][0] <= '9')))) {
		if ((CMD_ARGC == 2) && (strcmp(CMD_ARGV[1], "force") == 0))
			reg->valid = 0;

		if (reg->valid == 0) {
			int retval = reg->type->get(reg);
			if (retval != ERROR_OK) {
				LOG_ERROR("Could not read register '%s'", reg->name);
				return retval;
			}
		}
		char *value = buf_to_hex_str(reg->value, reg->size);
		command_print(CMD, "%s (/%i): 0x%s", reg->name, (int)(reg->size), value);
		free(value);
		return ERROR_OK;
	}

	/* set register value */
	if (CMD_ARGC == 2) {
		uint8_t *buf = malloc(DIV_ROUND_UP(reg->size, 8));
		if (!buf)
			return ERROR_FAIL;
		str_to_buf(CMD_ARGV[1], strlen(CMD_ARGV[1]), buf, reg->size, 0);

		int retval = reg->type->set(reg, buf);
		if (retval != ERROR_OK) {
			LOG_ERROR("Could not write to register '%s'", reg->name);
		} else {
			char *value = buf_to_hex_str(reg->value, reg->size);
			command_print(CMD, "%s (/%i): 0x%s", reg->name, (int)(reg->size), value);
			free(value);
		}

		free(buf);

		return retval;
	}

	return ERROR_COMMAND_SYNTAX_ERROR;

not_found:
	command_print(CMD, "register %s not found in current target", CMD_ARGV[0]);
	return ERROR_OK;
}

COMMAND_HANDLER(handle_poll_command)
{
	int retval = ERROR_OK;
	struct target *target = get_current_target(CMD_CTX);

	if (CMD_ARGC == 0) {
		command_print(CMD, "background polling: %s",
				jtag_poll_get_enabled() ? "on" : "off");
		command_print(CMD, "TAP: %s (%s)",
				target->tap->dotted_name,
				target->tap->enabled ? "enabled" : "disabled");
		if (!target->tap->enabled)
			return ERROR_OK;
		retval = target_poll(target);
		if (retval != ERROR_OK)
			return retval;
		retval = target_arch_state(target);
		if (retval != ERROR_OK)
			return retval;
	} else if (CMD_ARGC == 1) {
		bool enable;
		COMMAND_PARSE_ON_OFF(CMD_ARGV[0], enable);
		jtag_poll_set_enabled(enable);
	} else
		return ERROR_COMMAND_SYNTAX_ERROR;

	return retval;
}

COMMAND_HANDLER(handle_wait_halt_command)
{
	if (CMD_ARGC > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	unsigned ms = DEFAULT_HALT_TIMEOUT;
	if (1 == CMD_ARGC) {
		int retval = parse_uint(CMD_ARGV[0], &ms);
		if (retval != ERROR_OK)
			return ERROR_COMMAND_SYNTAX_ERROR;
	}

	struct target *target = get_current_target(CMD_CTX);
	return target_wait_state(target, TARGET_HALTED, ms);
}

/* wait for target state to change. The trick here is to have a low
 * latency for short waits and not to suck up all the CPU time
 * on longer waits.
 *
 * After 500ms, keep_alive() is invoked
 */
int target_wait_state(struct target *target, enum target_state state, int ms)
{
	int retval;
	int64_t then = 0, cur;
	bool once = true;

	for (;;) {
		retval = target_poll(target);
		if (retval != ERROR_OK)
			return retval;
		if (target->state == state)
			break;
		cur = timeval_ms();
		if (once) {
			once = false;
			then = timeval_ms();
			LOG_DEBUG("waiting for target %s...",
				jim_nvp_value2name_simple(nvp_target_state, state)->name);
		}

		if (cur-then > 500)
			keep_alive();

		if ((cur-then) > ms) {
			LOG_ERROR("timed out while waiting for target %s",
				jim_nvp_value2name_simple(nvp_target_state, state)->name);
			return ERROR_FAIL;
		}
	}

	return ERROR_OK;
}

COMMAND_HANDLER(handle_halt_command)
{
	LOG_DEBUG("-");

	struct target *target = get_current_target(CMD_CTX);

	target->verbose_halt_msg = true;

	int retval = target_halt(target);
	if (retval != ERROR_OK)
		return retval;

	if (CMD_ARGC == 1) {
		unsigned wait_local;
		retval = parse_uint(CMD_ARGV[0], &wait_local);
		if (retval != ERROR_OK)
			return ERROR_COMMAND_SYNTAX_ERROR;
		if (!wait_local)
			return ERROR_OK;
	}

	return CALL_COMMAND_HANDLER(handle_wait_halt_command);
}

COMMAND_HANDLER(handle_soft_reset_halt_command)
{
	struct target *target = get_current_target(CMD_CTX);

	LOG_USER("requesting target halt and executing a soft reset");

	target_soft_reset_halt(target);

	return ERROR_OK;
}

COMMAND_HANDLER(handle_reset_command)
{
	if (CMD_ARGC > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	enum target_reset_mode reset_mode = RESET_RUN;
	if (CMD_ARGC == 1) {
		const struct jim_nvp *n;
		n = jim_nvp_name2value_simple(nvp_reset_modes, CMD_ARGV[0]);
		if ((!n->name) || (n->value == RESET_UNKNOWN))
			return ERROR_COMMAND_SYNTAX_ERROR;
		reset_mode = n->value;
	}

	/* reset *all* targets */
	return target_process_reset(CMD, reset_mode);
}


COMMAND_HANDLER(handle_resume_command)
{
	int current = 1;
	if (CMD_ARGC > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	struct target *target = get_current_target(CMD_CTX);

	/* with no CMD_ARGV, resume from current pc, addr = 0,
	 * with one arguments, addr = CMD_ARGV[0],
	 * handle breakpoints, not debugging */
	target_addr_t addr = 0;
	if (CMD_ARGC == 1) {
		COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
		current = 0;
	}

	return target_resume(target, current, addr, 1, 0);
}

COMMAND_HANDLER(handle_step_command)
{
	if (CMD_ARGC > 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	LOG_DEBUG("-");

	/* with no CMD_ARGV, step from current pc, addr = 0,
	 * with one argument addr = CMD_ARGV[0],
	 * handle breakpoints, debugging */
	target_addr_t addr = 0;
	int current_pc = 1;
	if (CMD_ARGC == 1) {
		COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
		current_pc = 0;
	}

	struct target *target = get_current_target(CMD_CTX);

	return target_step(target, current_pc, addr, 1);
}

void target_handle_md_output(struct command_invocation *cmd,
		struct target *target, target_addr_t address, unsigned size,
		unsigned count, const uint8_t *buffer)
{
	const unsigned line_bytecnt = 32;
	unsigned line_modulo = line_bytecnt / size;

	char output[line_bytecnt * 4 + 1];
	unsigned output_len = 0;

	const char *value_fmt;
	switch (size) {
	case 8:
		value_fmt = "%16.16"PRIx64" ";
		break;
	case 4:
		value_fmt = "%8.8"PRIx64" ";
		break;
	case 2:
		value_fmt = "%4.4"PRIx64" ";
		break;
	case 1:
		value_fmt = "%2.2"PRIx64" ";
		break;
	default:
		/* "can't happen", caller checked */
		LOG_ERROR("invalid memory read size: %u", size);
		return;
	}

	for (unsigned i = 0; i < count; i++) {
		if (i % line_modulo == 0) {
			output_len += snprintf(output + output_len,
					sizeof(output) - output_len,
					TARGET_ADDR_FMT ": ",
					(address + (i * size)));
		}

		uint64_t value = 0;
		const uint8_t *value_ptr = buffer + i * size;
		switch (size) {
		case 8:
			value = target_buffer_get_u64(target, value_ptr);
			break;
		case 4:
			value = target_buffer_get_u32(target, value_ptr);
			break;
		case 2:
			value = target_buffer_get_u16(target, value_ptr);
			break;
		case 1:
			value = *value_ptr;
		}
		output_len += snprintf(output + output_len,
				sizeof(output) - output_len,
				value_fmt, value);

		if ((i % line_modulo == line_modulo - 1) || (i == count - 1)) {
			command_print(cmd, "%s", output);
			output_len = 0;
		}
	}
}

COMMAND_HANDLER(handle_md_command)
{
	if (CMD_ARGC < 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	unsigned size = 0;
	switch (CMD_NAME[2]) {
	case 'd':
		size = 8;
		break;
	case 'w':
		size = 4;
		break;
	case 'h':
		size = 2;
		break;
	case 'b':
		size = 1;
		break;
	default:
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	bool physical = strcmp(CMD_ARGV[0], "phys") == 0;
	int (*fn)(struct target *target,
			target_addr_t address, uint32_t size_value, uint32_t count, uint8_t *buffer);
	if (physical) {
		CMD_ARGC--;
		CMD_ARGV++;
		fn = target_read_phys_memory;
	} else
		fn = target_read_memory;
	if ((CMD_ARGC < 1) || (CMD_ARGC > 2))
		return ERROR_COMMAND_SYNTAX_ERROR;

	target_addr_t address;
	COMMAND_PARSE_ADDRESS(CMD_ARGV[0], address);

	unsigned count = 1;
	if (CMD_ARGC == 2)
		COMMAND_PARSE_NUMBER(uint, CMD_ARGV[1], count);

	uint8_t *buffer = calloc(count, size);
	if (!buffer) {
		LOG_ERROR("Failed to allocate md read buffer");
		return ERROR_FAIL;
	}

	struct target *target = get_current_target(CMD_CTX);
	int retval = fn(target, address, size, count, buffer);
	if (retval == ERROR_OK)
		target_handle_md_output(CMD, target, address, size, count, buffer);

	free(buffer);

	return retval;
}

typedef int (*target_write_fn)(struct target *target,
		target_addr_t address, uint32_t size, uint32_t count, const uint8_t *buffer);

static int target_fill_mem(struct target *target,
		target_addr_t address,
		target_write_fn fn,
		unsigned data_size,
		/* value */
		uint64_t b,
		/* count */
		unsigned c)
{
	/* We have to write in reasonably large chunks to be able
	 * to fill large memory areas with any sane speed */
	const unsigned chunk_size = 16384;
	uint8_t *target_buf = malloc(chunk_size * data_size);
	if (!target_buf) {
		LOG_ERROR("Out of memory");
		return ERROR_FAIL;
	}

	for (unsigned i = 0; i < chunk_size; i++) {
		switch (data_size) {
		case 8:
			target_buffer_set_u64(target, target_buf + i * data_size, b);
			break;
		case 4:
			target_buffer_set_u32(target, target_buf + i * data_size, b);
			break;
		case 2:
			target_buffer_set_u16(target, target_buf + i * data_size, b);
			break;
		case 1:
			target_buffer_set_u8(target, target_buf + i * data_size, b);
			break;
		default:
			exit(-1);
		}
	}

	int retval = ERROR_OK;

	for (unsigned x = 0; x < c; x += chunk_size) {
		unsigned current;
		current = c - x;
		if (current > chunk_size)
			current = chunk_size;
		retval = fn(target, address + x * data_size, data_size, current, target_buf);
		if (retval != ERROR_OK)
			break;
		/* avoid GDB timeouts */
		keep_alive();
	}
	free(target_buf);

	return retval;
}


COMMAND_HANDLER(handle_mw_command)
{
	if (CMD_ARGC < 2)
		return ERROR_COMMAND_SYNTAX_ERROR;
	bool physical = strcmp(CMD_ARGV[0], "phys") == 0;
	target_write_fn fn;
	if (physical) {
		CMD_ARGC--;
		CMD_ARGV++;
		fn = target_write_phys_memory;
	} else
		fn = target_write_memory;
	if ((CMD_ARGC < 2) || (CMD_ARGC > 3))
		return ERROR_COMMAND_SYNTAX_ERROR;

	target_addr_t address;
	COMMAND_PARSE_ADDRESS(CMD_ARGV[0], address);

	uint64_t value;
	COMMAND_PARSE_NUMBER(u64, CMD_ARGV[1], value);

	unsigned count = 1;
	if (CMD_ARGC == 3)
		COMMAND_PARSE_NUMBER(uint, CMD_ARGV[2], count);

	struct target *target = get_current_target(CMD_CTX);
	unsigned wordsize;
	switch (CMD_NAME[2]) {
		case 'd':
			wordsize = 8;
			break;
		case 'w':
			wordsize = 4;
			break;
		case 'h':
			wordsize = 2;
			break;
		case 'b':
			wordsize = 1;
			break;
		default:
			return ERROR_COMMAND_SYNTAX_ERROR;
	}

	return target_fill_mem(target, address, fn, wordsize, value, count);
}

static COMMAND_HELPER(parse_load_image_command, struct image *image,
		target_addr_t *min_address, target_addr_t *max_address)
{
	if (CMD_ARGC < 1 || CMD_ARGC > 5)
		return ERROR_COMMAND_SYNTAX_ERROR;

	/* a base address isn't always necessary,
	 * default to 0x0 (i.e. don't relocate) */
	if (CMD_ARGC >= 2) {
		target_addr_t addr;
		COMMAND_PARSE_ADDRESS(CMD_ARGV[1], addr);
		image->base_address = addr;
		image->base_address_set = true;
	} else
		image->base_address_set = false;

	image->start_address_set = false;

	if (CMD_ARGC >= 4)
		COMMAND_PARSE_ADDRESS(CMD_ARGV[3], *min_address);
	if (CMD_ARGC == 5) {
		COMMAND_PARSE_ADDRESS(CMD_ARGV[4], *max_address);
		/* use size (given) to find max (required) */
		*max_address += *min_address;
	}

	if (*min_address > *max_address)
		return ERROR_COMMAND_SYNTAX_ERROR;

	return ERROR_OK;
}

COMMAND_HANDLER(handle_load_image_command)
{
	uint8_t *buffer;
	size_t buf_cnt;
	uint32_t image_size;
	target_addr_t min_address = 0;
	target_addr_t max_address = -1;
	struct image image;

	int retval = CALL_COMMAND_HANDLER(parse_load_image_command,
			&image, &min_address, &max_address);
	if (retval != ERROR_OK)
		return retval;

	struct target *target = get_current_target(CMD_CTX);

	struct duration bench;
	duration_start(&bench);

	if (image_open(&image, CMD_ARGV[0], (CMD_ARGC >= 3) ? CMD_ARGV[2] : NULL) != ERROR_OK)
		return ERROR_FAIL;

	image_size = 0x0;
	retval = ERROR_OK;
	for (unsigned int i = 0; i < image.num_sections; i++) {
		buffer = malloc(image.sections[i].size);
		if (!buffer) {
			command_print(CMD,
						  "error allocating buffer for section (%d bytes)",
						  (int)(image.sections[i].size));
			retval = ERROR_FAIL;
			break;
		}

		retval = image_read_section(&image, i, 0x0, image.sections[i].size, buffer, &buf_cnt);
		if (retval != ERROR_OK) {
			free(buffer);
			break;
		}

		uint32_t offset = 0;
		uint32_t length = buf_cnt;

		/* DANGER!!! beware of unsigned comparison here!!! */

		if ((image.sections[i].base_address + buf_cnt >= min_address) &&
				(image.sections[i].base_address < max_address)) {

			if (image.sections[i].base_address < min_address) {
				/* clip addresses below */
				offset += min_address-image.sections[i].base_address;
				length -= offset;
			}

			if (image.sections[i].base_address + buf_cnt > max_address)
				length -= (image.sections[i].base_address + buf_cnt)-max_address;

			retval = target_write_buffer(target,
					image.sections[i].base_address + offset, length, buffer + offset);
			if (retval != ERROR_OK) {
				free(buffer);
				break;
			}
			image_size += length;
			command_print(CMD, "%u bytes written at address " TARGET_ADDR_FMT "",
					(unsigned int)length,
					image.sections[i].base_address + offset);
		}

		free(buffer);
	}

	if ((retval == ERROR_OK) && (duration_measure(&bench) == ERROR_OK)) {
		command_print(CMD, "downloaded %" PRIu32 " bytes "
				"in %fs (%0.3f KiB/s)", image_size,
				duration_elapsed(&bench), duration_kbps(&bench, image_size));
	}

	image_close(&image);

	return retval;

}

COMMAND_HANDLER(handle_dump_image_command)
{
	struct fileio *fileio;
	uint8_t *buffer;
	int retval, retvaltemp;
	target_addr_t address, size;
	struct duration bench;
	struct target *target = get_current_target(CMD_CTX);

	if (CMD_ARGC != 3)
		return ERROR_COMMAND_SYNTAX_ERROR;

	COMMAND_PARSE_ADDRESS(CMD_ARGV[1], address);
	COMMAND_PARSE_ADDRESS(CMD_ARGV[2], size);

	uint32_t buf_size = (size > 4096) ? 4096 : size;
	buffer = malloc(buf_size);
	if (!buffer)
		return ERROR_FAIL;

	retval = fileio_open(&fileio, CMD_ARGV[0], FILEIO_WRITE, FILEIO_BINARY);
	if (retval != ERROR_OK) {
		free(buffer);
		return retval;
	}

	duration_start(&bench);

	while (size > 0) {
		size_t size_written;
		uint32_t this_run_size = (size > buf_size) ? buf_size : size;
		retval = target_read_buffer(target, address, this_run_size, buffer);
		if (retval != ERROR_OK)
			break;

		retval = fileio_write(fileio, this_run_size, buffer, &size_written);
		if (retval != ERROR_OK)
			break;

		size -= this_run_size;
		address += this_run_size;
	}

	free(buffer);

	if ((retval == ERROR_OK) && (duration_measure(&bench) == ERROR_OK)) {
		size_t filesize;
		retval = fileio_size(fileio, &filesize);
		if (retval != ERROR_OK)
			return retval;
		command_print(CMD,
				"dumped %zu bytes in %fs (%0.3f KiB/s)", filesize,
				duration_elapsed(&bench), duration_kbps(&bench, filesize));
	}

	retvaltemp = fileio_close(fileio);
	if (retvaltemp != ERROR_OK)
		return retvaltemp;

	return retval;
}

enum verify_mode {
	IMAGE_TEST = 0,
	IMAGE_VERIFY = 1,
	IMAGE_CHECKSUM_ONLY = 2
};

static COMMAND_HELPER(handle_verify_image_command_internal, enum verify_mode verify)
{
	uint8_t *buffer;
	size_t buf_cnt;
	uint32_t image_size;
	int retval;
	uint32_t checksum = 0;
	uint32_t mem_checksum = 0;

	struct image image;

	struct target *target = get_current_target(CMD_CTX);

	if (CMD_ARGC < 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	if (!target) {
		LOG_ERROR("no target selected");
		return ERROR_FAIL;
	}

	struct duration bench;
	duration_start(&bench);

	if (CMD_ARGC >= 2) {
		target_addr_t addr;
		COMMAND_PARSE_ADDRESS(CMD_ARGV[1], addr);
		image.base_address = addr;
		image.base_address_set = true;
	} else {
		image.base_address_set = false;
		image.base_address = 0x0;
	}

	image.start_address_set = false;

	retval = image_open(&image, CMD_ARGV[0], (CMD_ARGC == 3) ? CMD_ARGV[2] : NULL);
	if (retval != ERROR_OK)
		return retval;

	image_size = 0x0;
	int diffs = 0;
	retval = ERROR_OK;
	for (unsigned int i = 0; i < image.num_sections; i++) {
		buffer = malloc(image.sections[i].size);
		if (!buffer) {
			command_print(CMD,
					"error allocating buffer for section (%" PRIu32 " bytes)",
					image.sections[i].size);
			break;
		}
		retval = image_read_section(&image, i, 0x0, image.sections[i].size, buffer, &buf_cnt);
		if (retval != ERROR_OK) {
			free(buffer);
			break;
		}

		if (verify >= IMAGE_VERIFY) {
			/* calculate checksum of image */
			retval = image_calculate_checksum(buffer, buf_cnt, &checksum);
			if (retval != ERROR_OK) {
				free(buffer);
				break;
			}

			retval = target_checksum_memory(target, image.sections[i].base_address, buf_cnt, &mem_checksum);
			if (retval != ERROR_OK) {
				free(buffer);
				break;
			}
			if ((checksum != mem_checksum) && (verify == IMAGE_CHECKSUM_ONLY)) {
				LOG_ERROR("checksum mismatch");
				free(buffer);
				retval = ERROR_FAIL;
				goto done;
			}
			if (checksum != mem_checksum) {
				/* failed crc checksum, fall back to a binary compare */
				uint8_t *data;

				if (diffs == 0)
					LOG_ERROR("checksum mismatch - attempting binary compare");

				data = malloc(buf_cnt);

				retval = target_read_buffer(target, image.sections[i].base_address, buf_cnt, data);
				if (retval == ERROR_OK) {
					uint32_t t;
					for (t = 0; t < buf_cnt; t++) {
						if (data[t] != buffer[t]) {
							command_print(CMD,
										  "diff %d address 0x%08x. Was 0x%02x instead of 0x%02x",
										  diffs,
										  (unsigned)(t + image.sections[i].base_address),
										  data[t],
										  buffer[t]);
							if (diffs++ >= 127) {
								command_print(CMD, "More than 128 errors, the rest are not printed.");
								free(data);
								free(buffer);
								goto done;
							}
						}
						keep_alive();
					}
				}
				free(data);
			}
		} else {
			command_print(CMD, "address " TARGET_ADDR_FMT " length 0x%08zx",
						  image.sections[i].base_address,
						  buf_cnt);
		}

		free(buffer);
		image_size += buf_cnt;
	}
	if (diffs > 0)
		command_print(CMD, "No more differences found.");
done:
	if (diffs > 0)
		retval = ERROR_FAIL;
	if ((retval == ERROR_OK) && (duration_measure(&bench) == ERROR_OK)) {
		command_print(CMD, "verified %" PRIu32 " bytes "
				"in %fs (%0.3f KiB/s)", image_size,
				duration_elapsed(&bench), duration_kbps(&bench, image_size));
	}

	image_close(&image);

	return retval;
}

COMMAND_HANDLER(handle_verify_image_checksum_command)
{
	return CALL_COMMAND_HANDLER(handle_verify_image_command_internal, IMAGE_CHECKSUM_ONLY);
}

COMMAND_HANDLER(handle_verify_image_command)
{
	return CALL_COMMAND_HANDLER(handle_verify_image_command_internal, IMAGE_VERIFY);
}

COMMAND_HANDLER(handle_test_image_command)
{
	return CALL_COMMAND_HANDLER(handle_verify_image_command_internal, IMAGE_TEST);
}

static int handle_bp_command_list(struct command_invocation *cmd)
{
	struct target *target = get_current_target(cmd->ctx);
	struct breakpoint *breakpoint = target->breakpoints;
	while (breakpoint) {
		if (breakpoint->type == BKPT_SOFT) {
			char *buf = buf_to_hex_str(breakpoint->orig_instr,
					breakpoint->length);
			command_print(cmd, "IVA breakpoint: " TARGET_ADDR_FMT ", 0x%x, 0x%s",
					breakpoint->address,
					breakpoint->length,
					buf);
			free(buf);
		} else {
			if ((breakpoint->address == 0) && (breakpoint->asid != 0))
				command_print(cmd, "Context breakpoint: 0x%8.8" PRIx32 ", 0x%x, %u",
							breakpoint->asid,
							breakpoint->length, breakpoint->number);
			else if ((breakpoint->address != 0) && (breakpoint->asid != 0)) {
				command_print(cmd, "Hybrid breakpoint(IVA): " TARGET_ADDR_FMT ", 0x%x, %u",
							breakpoint->address,
							breakpoint->length, breakpoint->number);
				command_print(cmd, "\t|--->linked with ContextID: 0x%8.8" PRIx32,
							breakpoint->asid);
			} else
				command_print(cmd, "Breakpoint(IVA): " TARGET_ADDR_FMT ", 0x%x, %u",
							breakpoint->address,
							breakpoint->length, breakpoint->number);
		}

		breakpoint = breakpoint->next;
	}
	return ERROR_OK;
}

static int handle_bp_command_set(struct command_invocation *cmd,
		target_addr_t addr, uint32_t asid, uint32_t length, int hw)
{
	struct target *target = get_current_target(cmd->ctx);
	int retval;

	if (asid == 0) {
		retval = breakpoint_add(target, addr, length, hw);
		/* error is always logged in breakpoint_add(), do not print it again */
		if (retval == ERROR_OK)
			command_print(cmd, "breakpoint set at " TARGET_ADDR_FMT "", addr);

	} else if (addr == 0) {
		if (!target->type->add_context_breakpoint) {
			LOG_ERROR("Context breakpoint not available");
			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
		}
		retval = context_breakpoint_add(target, asid, length, hw);
		/* error is always logged in context_breakpoint_add(), do not print it again */
		if (retval == ERROR_OK)
			command_print(cmd, "Context breakpoint set at 0x%8.8" PRIx32 "", asid);

	} else {
		if (!target->type->add_hybrid_breakpoint) {
			LOG_ERROR("Hybrid breakpoint not available");
			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
		}
		retval = hybrid_breakpoint_add(target, addr, asid, length, hw);
		/* error is always logged in hybrid_breakpoint_add(), do not print it again */
		if (retval == ERROR_OK)
			command_print(cmd, "Hybrid breakpoint set at 0x%8.8" PRIx32 "", asid);
	}
	return retval;
}

COMMAND_HANDLER(handle_bp_command)
{
	target_addr_t addr;
	uint32_t asid;
	uint32_t length;
	int hw = BKPT_SOFT;

	switch (CMD_ARGC) {
		case 0:
			return handle_bp_command_list(CMD);

		case 2:
			asid = 0;
			COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
			COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], length);
			return handle_bp_command_set(CMD, addr, asid, length, hw);

		case 3:
			if (strcmp(CMD_ARGV[2], "hw") == 0) {
				hw = BKPT_HARD;
				COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
				COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], length);
				asid = 0;
				return handle_bp_command_set(CMD, addr, asid, length, hw);
			} else if (strcmp(CMD_ARGV[2], "hw_ctx") == 0) {
				hw = BKPT_HARD;
				COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], asid);
				COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], length);
				addr = 0;
				return handle_bp_command_set(CMD, addr, asid, length, hw);
			}
			/* fallthrough */
		case 4:
			hw = BKPT_HARD;
			COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
			COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], asid);
			COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], length);
			return handle_bp_command_set(CMD, addr, asid, length, hw);

		default:
			return ERROR_COMMAND_SYNTAX_ERROR;
	}
}

COMMAND_HANDLER(handle_rbp_command)
{
	if (CMD_ARGC != 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	struct target *target = get_current_target(CMD_CTX);

	if (!strcmp(CMD_ARGV[0], "all")) {
		breakpoint_remove_all(target);
	} else {
		target_addr_t addr;
		COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);

		breakpoint_remove(target, addr);
	}

	return ERROR_OK;
}

COMMAND_HANDLER(handle_wp_command)
{
	struct target *target = get_current_target(CMD_CTX);

	if (CMD_ARGC == 0) {
		struct watchpoint *watchpoint = target->watchpoints;

		while (watchpoint) {
			command_print(CMD, "address: " TARGET_ADDR_FMT
					", len: 0x%8.8" PRIx32
					", r/w/a: %i, value: 0x%8.8" PRIx32
					", mask: 0x%8.8" PRIx32,
					watchpoint->address,
					watchpoint->length,
					(int)watchpoint->rw,
					watchpoint->value,
					watchpoint->mask);
			watchpoint = watchpoint->next;
		}
		return ERROR_OK;
	}

	enum watchpoint_rw type = WPT_ACCESS;
	target_addr_t addr = 0;
	uint32_t length = 0;
	uint32_t data_value = 0x0;
	uint32_t data_mask = 0xffffffff;

	switch (CMD_ARGC) {
	case 5:
		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[4], data_mask);
		/* fall through */
	case 4:
		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], data_value);
		/* fall through */
	case 3:
		switch (CMD_ARGV[2][0]) {
		case 'r':
			type = WPT_READ;
			break;
		case 'w':
			type = WPT_WRITE;
			break;
		case 'a':
			type = WPT_ACCESS;
			break;
		default:
			LOG_ERROR("invalid watchpoint mode ('%c')", CMD_ARGV[2][0]);
			return ERROR_COMMAND_SYNTAX_ERROR;
		}
		/* fall through */
	case 2:
		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], length);
		COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);
		break;

	default:
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	int retval = watchpoint_add(target, addr, length, type,
			data_value, data_mask);
	if (retval != ERROR_OK)
		LOG_ERROR("Failure setting watchpoints");

	return retval;
}

COMMAND_HANDLER(handle_rwp_command)
{
	if (CMD_ARGC != 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	target_addr_t addr;
	COMMAND_PARSE_ADDRESS(CMD_ARGV[0], addr);

	struct target *target = get_current_target(CMD_CTX);
	watchpoint_remove(target, addr);

	return ERROR_OK;
}

/**
 * Translate a virtual address to a physical address.
 *
 * The low-level target implementation must have logged a detailed error
 * which is forwarded to telnet/GDB session.
 */
COMMAND_HANDLER(handle_virt2phys_command)
{
	if (CMD_ARGC != 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	target_addr_t va;
	COMMAND_PARSE_ADDRESS(CMD_ARGV[0], va);
	target_addr_t pa;

	struct target *target = get_current_target(CMD_CTX);
	int retval = target->type->virt2phys(target, va, &pa);
	if (retval == ERROR_OK)
		command_print(CMD, "Physical address " TARGET_ADDR_FMT "", pa);

	return retval;
}

static void write_data(FILE *f, const void *data, size_t len)
{
	size_t written = fwrite(data, 1, len, f);
	if (written != len)
		LOG_ERROR("failed to write %zu bytes: %s", len, strerror(errno));
}

static void write_long(FILE *f, int l, struct target *target)
{
	uint8_t val[4];

	target_buffer_set_u32(target, val, l);
	write_data(f, val, 4);
}

static void write_string(FILE *f, char *s)
{
	write_data(f, s, strlen(s));
}

typedef unsigned char UNIT[2];  /* unit of profiling */

/* Dump a gmon.out histogram file. */
static void write_gmon(uint32_t *samples, uint32_t sample_num, const char *filename, bool with_range,
			uint32_t start_address, uint32_t end_address, struct target *target, uint32_t duration_ms)
{
	uint32_t i;
	FILE *f = fopen(filename, "w");
	if (!f)
		return;
	write_string(f, "gmon");
	write_long(f, 0x00000001, target); /* Version */
	write_long(f, 0, target); /* padding */
	write_long(f, 0, target); /* padding */
	write_long(f, 0, target); /* padding */

	uint8_t zero = 0;  /* GMON_TAG_TIME_HIST */
	write_data(f, &zero, 1);

	/* figure out bucket size */
	uint32_t min;
	uint32_t max;
	if (with_range) {
		min = start_address;
		max = end_address;
	} else {
		min = samples[0];
		max = samples[0];
		for (i = 0; i < sample_num; i++) {
			if (min > samples[i])
				min = samples[i];
			if (max < samples[i])
				max = samples[i];
		}

		/* max should be (largest sample + 1)
		 * Refer to binutils/gprof/hist.c (find_histogram_for_pc) */
		max++;
	}

	int address_space = max - min;
	assert(address_space >= 2);

	/* FIXME: What is the reasonable number of buckets?
	 * The profiling result will be more accurate if there are enough buckets. */
	static const uint32_t max_buckets = 128 * 1024; /* maximum buckets. */
	uint32_t num_buckets = address_space / sizeof(UNIT);
	if (num_buckets > max_buckets)
		num_buckets = max_buckets;
	int *buckets = malloc(sizeof(int) * num_buckets);
	if (!buckets) {
		fclose(f);
		return;
	}
	memset(buckets, 0, sizeof(int) * num_buckets);
	for (i = 0; i < sample_num; i++) {
		uint32_t address = samples[i];

		if ((address < min) || (max <= address))
			continue;

		long long a = address - min;
		long long b = num_buckets;
		long long c = address_space;
		int index_t = (a * b) / c; /* danger!!!! int32 overflows */
		buckets[index_t]++;
	}

	/* append binary memory gmon.out &profile_hist_hdr ((char*)&profile_hist_hdr + sizeof(struct gmon_hist_hdr)) */
	write_long(f, min, target);			/* low_pc */
	write_long(f, max, target);			/* high_pc */
	write_long(f, num_buckets, target);	/* # of buckets */
	float sample_rate = sample_num / (duration_ms / 1000.0);
	write_long(f, sample_rate, target);
	write_string(f, "seconds");
	for (i = 0; i < (15-strlen("seconds")); i++)
		write_data(f, &zero, 1);
	write_string(f, "s");

	/*append binary memory gmon.out profile_hist_data (profile_hist_data + profile_hist_hdr.hist_size) */

	char *data = malloc(2 * num_buckets);
	if (data) {
		for (i = 0; i < num_buckets; i++) {
			int val;
			val = buckets[i];
			if (val > 65535)
				val = 65535;
			data[i * 2] = val&0xff;
			data[i * 2 + 1] = (val >> 8) & 0xff;
		}
		free(buckets);
		write_data(f, data, num_buckets * 2);
		free(data);
	} else
		free(buckets);

	fclose(f);
}

/* profiling samples the CPU PC as quickly as OpenOCD is able,
 * which will be used as a random sampling of PC */
COMMAND_HANDLER(handle_profile_command)
{
	struct target *target = get_current_target(CMD_CTX);

	if ((CMD_ARGC != 2) && (CMD_ARGC != 4))
		return ERROR_COMMAND_SYNTAX_ERROR;

	const uint32_t MAX_PROFILE_SAMPLE_NUM = 10000;
	uint32_t offset;
	uint32_t num_of_samples;
	int retval = ERROR_OK;
	bool halted_before_profiling = target->state == TARGET_HALTED;

	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], offset);

	uint32_t *samples = malloc(sizeof(uint32_t) * MAX_PROFILE_SAMPLE_NUM);
	if (!samples) {
		LOG_ERROR("No memory to store samples.");
		return ERROR_FAIL;
	}

	uint64_t timestart_ms = timeval_ms();
	/**
	 * Some cores let us sample the PC without the
	 * annoying halt/resume step; for example, ARMv7 PCSR.
	 * Provide a way to use that more efficient mechanism.
	 */
	retval = target_profiling(target, samples, MAX_PROFILE_SAMPLE_NUM,
				&num_of_samples, offset);
	if (retval != ERROR_OK) {
		free(samples);
		return retval;
	}
	uint32_t duration_ms = timeval_ms() - timestart_ms;

	assert(num_of_samples <= MAX_PROFILE_SAMPLE_NUM);

	retval = target_poll(target);
	if (retval != ERROR_OK) {
		free(samples);
		return retval;
	}

	if (target->state == TARGET_RUNNING && halted_before_profiling) {
		/* The target was halted before we started and is running now. Halt it,
		 * for consistency. */
		retval = target_halt(target);
		if (retval != ERROR_OK) {
			free(samples);
			return retval;
		}
	} else if (target->state == TARGET_HALTED && !halted_before_profiling) {
		/* The target was running before we started and is halted now. Resume
		 * it, for consistency. */
		retval = target_resume(target, 1, 0, 0, 0);
		if (retval != ERROR_OK) {
			free(samples);
			return retval;
		}
	}

	retval = target_poll(target);
	if (retval != ERROR_OK) {
		free(samples);
		return retval;
	}

	uint32_t start_address = 0;
	uint32_t end_address = 0;
	bool with_range = false;
	if (CMD_ARGC == 4) {
		with_range = true;
		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], start_address);
		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], end_address);
	}

	write_gmon(samples, num_of_samples, CMD_ARGV[1],
		   with_range, start_address, end_address, target, duration_ms);
	command_print(CMD, "Wrote %s", CMD_ARGV[1]);

	free(samples);
	return retval;
}

static int new_u64_array_element(Jim_Interp *interp, const char *varname, int idx, uint64_t val)
{
	char *namebuf;
	Jim_Obj *obj_name, *obj_val;
	int result;

	namebuf = alloc_printf("%s(%d)", varname, idx);
	if (!namebuf)
		return JIM_ERR;

	obj_name = Jim_NewStringObj(interp, namebuf, -1);
	jim_wide wide_val = val;
	obj_val = Jim_NewWideObj(interp, wide_val);
	if (!obj_name || !obj_val) {
		free(namebuf);
		return JIM_ERR;
	}

	Jim_IncrRefCount(obj_name);
	Jim_IncrRefCount(obj_val);
	result = Jim_SetVariable(interp, obj_name, obj_val);
	Jim_DecrRefCount(interp, obj_name);
	Jim_DecrRefCount(interp, obj_val);
	free(namebuf);
	/* printf("%s(%d) <= 0%08x\n", varname, idx, val); */
	return result;
}

static int target_mem2array(Jim_Interp *interp, struct target *target, int argc, Jim_Obj *const *argv)
{
	int e;

	LOG_WARNING("DEPRECATED! use 'read_memory' not 'mem2array'");

	/* argv[0] = name of array to receive the data
	 * argv[1] = desired element width in bits
	 * argv[2] = memory address
	 * argv[3] = count of times to read
	 * argv[4] = optional "phys"
	 */
	if (argc < 4 || argc > 5) {
		Jim_WrongNumArgs(interp, 0, argv, "varname width addr nelems [phys]");
		return JIM_ERR;
	}

	/* Arg 0: Name of the array variable */
	const char *varname = Jim_GetString(argv[0], NULL);

	/* Arg 1: Bit width of one element */
	long l;
	e = Jim_GetLong(interp, argv[1], &l);
	if (e != JIM_OK)
		return e;
	const unsigned int width_bits = l;

	if (width_bits != 8 &&
			width_bits != 16 &&
			width_bits != 32 &&
			width_bits != 64) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"Invalid width param. Must be one of: 8, 16, 32 or 64.", NULL);
		return JIM_ERR;
	}
	const unsigned int width = width_bits / 8;

	/* Arg 2: Memory address */
	jim_wide wide_addr;
	e = Jim_GetWide(interp, argv[2], &wide_addr);
	if (e != JIM_OK)
		return e;
	target_addr_t addr = (target_addr_t)wide_addr;

	/* Arg 3: Number of elements to read */
	e = Jim_GetLong(interp, argv[3], &l);
	if (e != JIM_OK)
		return e;
	size_t len = l;

	/* Arg 4: phys */
	bool is_phys = false;
	if (argc > 4) {
		int str_len = 0;
		const char *phys = Jim_GetString(argv[4], &str_len);
		if (!strncmp(phys, "phys", str_len))
			is_phys = true;
		else
			return JIM_ERR;
	}

	/* Argument checks */
	if (len == 0) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp), "mem2array: zero width read?", NULL);
		return JIM_ERR;
	}
	if ((addr + (len * width)) < addr) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp), "mem2array: addr + len - wraps to zero?", NULL);
		return JIM_ERR;
	}
	if (len > 65536) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"mem2array: too large read request, exceeds 64K items", NULL);
		return JIM_ERR;
	}

	if ((width == 1) ||
		((width == 2) && ((addr & 1) == 0)) ||
		((width == 4) && ((addr & 3) == 0)) ||
		((width == 8) && ((addr & 7) == 0))) {
		/* alignment correct */
	} else {
		char buf[100];
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		sprintf(buf, "mem2array address: " TARGET_ADDR_FMT " is not aligned for %" PRIu32 " byte reads",
				addr,
				width);
		Jim_AppendStrings(interp, Jim_GetResult(interp), buf, NULL);
		return JIM_ERR;
	}

	/* Transfer loop */

	/* index counter */
	size_t idx = 0;

	const size_t buffersize = 4096;
	uint8_t *buffer = malloc(buffersize);
	if (!buffer)
		return JIM_ERR;

	/* assume ok */
	e = JIM_OK;
	while (len) {
		/* Slurp... in buffer size chunks */
		const unsigned int max_chunk_len = buffersize / width;
		const size_t chunk_len = MIN(len, max_chunk_len); /* in elements.. */

		int retval;
		if (is_phys)
			retval = target_read_phys_memory(target, addr, width, chunk_len, buffer);
		else
			retval = target_read_memory(target, addr, width, chunk_len, buffer);
		if (retval != ERROR_OK) {
			/* BOO !*/
			LOG_ERROR("mem2array: Read @ " TARGET_ADDR_FMT ", w=%u, cnt=%zu, failed",
					  addr,
					  width,
					  chunk_len);
			Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
			Jim_AppendStrings(interp, Jim_GetResult(interp), "mem2array: cannot read memory", NULL);
			e = JIM_ERR;
			break;
		} else {
			for (size_t i = 0; i < chunk_len ; i++, idx++) {
				uint64_t v = 0;
				switch (width) {
					case 8:
						v = target_buffer_get_u64(target, &buffer[i*width]);
						break;
					case 4:
						v = target_buffer_get_u32(target, &buffer[i*width]);
						break;
					case 2:
						v = target_buffer_get_u16(target, &buffer[i*width]);
						break;
					case 1:
						v = buffer[i] & 0x0ff;
						break;
				}
				new_u64_array_element(interp, varname, idx, v);
			}
			len -= chunk_len;
			addr += chunk_len * width;
		}
	}

	free(buffer);

	Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));

	return e;
}

static int target_jim_read_memory(Jim_Interp *interp, int argc,
		Jim_Obj * const *argv)
{
	/*
	 * argv[1] = memory address
	 * argv[2] = desired element width in bits
	 * argv[3] = number of elements to read
	 * argv[4] = optional "phys"
	 */

	if (argc < 4 || argc > 5) {
		Jim_WrongNumArgs(interp, 1, argv, "address width count ['phys']");
		return JIM_ERR;
	}

	/* Arg 1: Memory address. */
	jim_wide wide_addr;
	int e;
	e = Jim_GetWide(interp, argv[1], &wide_addr);

	if (e != JIM_OK)
		return e;

	target_addr_t addr = (target_addr_t)wide_addr;

	/* Arg 2: Bit width of one element. */
	long l;
	e = Jim_GetLong(interp, argv[2], &l);

	if (e != JIM_OK)
		return e;

	const unsigned int width_bits = l;

	/* Arg 3: Number of elements to read. */
	e = Jim_GetLong(interp, argv[3], &l);

	if (e != JIM_OK)
		return e;

	size_t count = l;

	/* Arg 4: Optional 'phys'. */
	bool is_phys = false;

	if (argc > 4) {
		const char *phys = Jim_GetString(argv[4], NULL);

		if (strcmp(phys, "phys")) {
			Jim_SetResultFormatted(interp, "invalid argument '%s', must be 'phys'", phys);
			return JIM_ERR;
		}

		is_phys = true;
	}

	switch (width_bits) {
	case 8:
	case 16:
	case 32:
	case 64:
		break;
	default:
		Jim_SetResultString(interp, "invalid width, must be 8, 16, 32 or 64", -1);
		return JIM_ERR;
	}

	const unsigned int width = width_bits / 8;

	if ((addr + (count * width)) < addr) {
		Jim_SetResultString(interp, "read_memory: addr + count wraps to zero", -1);
		return JIM_ERR;
	}

	if (count > 65536) {
		Jim_SetResultString(interp, "read_memory: too large read request, exeeds 64K elements", -1);
		return JIM_ERR;
	}

	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx != NULL);
	struct target *target = get_current_target(cmd_ctx);

	const size_t buffersize = 4096;
	uint8_t *buffer = malloc(buffersize);

	if (!buffer) {
		LOG_ERROR("Failed to allocate memory");
		return JIM_ERR;
	}

	Jim_Obj *result_list = Jim_NewListObj(interp, NULL, 0);
	Jim_IncrRefCount(result_list);

	while (count > 0) {
		const unsigned int max_chunk_len = buffersize / width;
		const size_t chunk_len = MIN(count, max_chunk_len);

		int retval;

		if (is_phys)
			retval = target_read_phys_memory(target, addr, width, chunk_len, buffer);
		else
			retval = target_read_memory(target, addr, width, chunk_len, buffer);

		if (retval != ERROR_OK) {
			LOG_ERROR("read_memory: read at " TARGET_ADDR_FMT " with width=%u and count=%zu failed",
				addr, width_bits, chunk_len);
			Jim_SetResultString(interp, "read_memory: failed to read memory", -1);
			e = JIM_ERR;
			break;
		}

		for (size_t i = 0; i < chunk_len ; i++) {
			uint64_t v = 0;

			switch (width) {
			case 8:
				v = target_buffer_get_u64(target, &buffer[i * width]);
				break;
			case 4:
				v = target_buffer_get_u32(target, &buffer[i * width]);
				break;
			case 2:
				v = target_buffer_get_u16(target, &buffer[i * width]);
				break;
			case 1:
				v = buffer[i];
				break;
			}

			char value_buf[11];
			snprintf(value_buf, sizeof(value_buf), "0x%" PRIx64, v);

			Jim_ListAppendElement(interp, result_list,
				Jim_NewStringObj(interp, value_buf, -1));
		}

		count -= chunk_len;
		addr += chunk_len * width;
	}

	free(buffer);

	if (e != JIM_OK) {
		Jim_DecrRefCount(interp, result_list);
		return e;
	}

	Jim_SetResult(interp, result_list);
	Jim_DecrRefCount(interp, result_list);

	return JIM_OK;
}

static int get_u64_array_element(Jim_Interp *interp, const char *varname, size_t idx, uint64_t *val)
{
	char *namebuf = alloc_printf("%s(%zu)", varname, idx);
	if (!namebuf)
		return JIM_ERR;

	Jim_Obj *obj_name = Jim_NewStringObj(interp, namebuf, -1);
	if (!obj_name) {
		free(namebuf);
		return JIM_ERR;
	}

	Jim_IncrRefCount(obj_name);
	Jim_Obj *obj_val = Jim_GetVariable(interp, obj_name, JIM_ERRMSG);
	Jim_DecrRefCount(interp, obj_name);
	free(namebuf);
	if (!obj_val)
		return JIM_ERR;

	jim_wide wide_val;
	int result = Jim_GetWide(interp, obj_val, &wide_val);
	*val = wide_val;
	return result;
}

static int target_array2mem(Jim_Interp *interp, struct target *target,
		int argc, Jim_Obj *const *argv)
{
	int e;

	LOG_WARNING("DEPRECATED! use 'write_memory' not 'array2mem'");

	/* argv[0] = name of array from which to read the data
	 * argv[1] = desired element width in bits
	 * argv[2] = memory address
	 * argv[3] = number of elements to write
	 * argv[4] = optional "phys"
	 */
	if (argc < 4 || argc > 5) {
		Jim_WrongNumArgs(interp, 0, argv, "varname width addr nelems [phys]");
		return JIM_ERR;
	}

	/* Arg 0: Name of the array variable */
	const char *varname = Jim_GetString(argv[0], NULL);

	/* Arg 1: Bit width of one element */
	long l;
	e = Jim_GetLong(interp, argv[1], &l);
	if (e != JIM_OK)
		return e;
	const unsigned int width_bits = l;

	if (width_bits != 8 &&
			width_bits != 16 &&
			width_bits != 32 &&
			width_bits != 64) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"Invalid width param. Must be one of: 8, 16, 32 or 64.", NULL);
		return JIM_ERR;
	}
	const unsigned int width = width_bits / 8;

	/* Arg 2: Memory address */
	jim_wide wide_addr;
	e = Jim_GetWide(interp, argv[2], &wide_addr);
	if (e != JIM_OK)
		return e;
	target_addr_t addr = (target_addr_t)wide_addr;

	/* Arg 3: Number of elements to write */
	e = Jim_GetLong(interp, argv[3], &l);
	if (e != JIM_OK)
		return e;
	size_t len = l;

	/* Arg 4: Phys */
	bool is_phys = false;
	if (argc > 4) {
		int str_len = 0;
		const char *phys = Jim_GetString(argv[4], &str_len);
		if (!strncmp(phys, "phys", str_len))
			is_phys = true;
		else
			return JIM_ERR;
	}

	/* Argument checks */
	if (len == 0) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"array2mem: zero width read?", NULL);
		return JIM_ERR;
	}

	if ((addr + (len * width)) < addr) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"array2mem: addr + len - wraps to zero?", NULL);
		return JIM_ERR;
	}

	if (len > 65536) {
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		Jim_AppendStrings(interp, Jim_GetResult(interp),
				"array2mem: too large memory write request, exceeds 64K items", NULL);
		return JIM_ERR;
	}

	if ((width == 1) ||
		((width == 2) && ((addr & 1) == 0)) ||
		((width == 4) && ((addr & 3) == 0)) ||
		((width == 8) && ((addr & 7) == 0))) {
		/* alignment correct */
	} else {
		char buf[100];
		Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
		sprintf(buf, "array2mem address: " TARGET_ADDR_FMT " is not aligned for %" PRIu32 " byte reads",
				addr,
				width);
		Jim_AppendStrings(interp, Jim_GetResult(interp), buf, NULL);
		return JIM_ERR;
	}

	/* Transfer loop */

	/* assume ok */
	e = JIM_OK;

	const size_t buffersize = 4096;
	uint8_t *buffer = malloc(buffersize);
	if (!buffer)
		return JIM_ERR;

	/* index counter */
	size_t idx = 0;

	while (len) {
		/* Slurp... in buffer size chunks */
		const unsigned int max_chunk_len = buffersize / width;

		const size_t chunk_len = MIN(len, max_chunk_len); /* in elements.. */

		/* Fill the buffer */
		for (size_t i = 0; i < chunk_len; i++, idx++) {
			uint64_t v = 0;
			if (get_u64_array_element(interp, varname, idx, &v) != JIM_OK) {
				free(buffer);
				return JIM_ERR;
			}
			switch (width) {
			case 8:
				target_buffer_set_u64(target, &buffer[i * width], v);
				break;
			case 4:
				target_buffer_set_u32(target, &buffer[i * width], v);
				break;
			case 2:
				target_buffer_set_u16(target, &buffer[i * width], v);
				break;
			case 1:
				buffer[i] = v & 0x0ff;
				break;
			}
		}
		len -= chunk_len;

		/* Write the buffer to memory */
		int retval;
		if (is_phys)
			retval = target_write_phys_memory(target, addr, width, chunk_len, buffer);
		else
			retval = target_write_memory(target, addr, width, chunk_len, buffer);
		if (retval != ERROR_OK) {
			/* BOO !*/
			LOG_ERROR("array2mem: Write @ " TARGET_ADDR_FMT ", w=%u, cnt=%zu, failed",
					  addr,
					  width,
					  chunk_len);
			Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));
			Jim_AppendStrings(interp, Jim_GetResult(interp), "array2mem: cannot read memory", NULL);
			e = JIM_ERR;
			break;
		}
		addr += chunk_len * width;
	}

	free(buffer);

	Jim_SetResult(interp, Jim_NewEmptyStringObj(interp));

	return e;
}

static int target_jim_write_memory(Jim_Interp *interp, int argc,
		Jim_Obj * const *argv)
{
	/*
	 * argv[1] = memory address
	 * argv[2] = desired element width in bits
	 * argv[3] = list of data to write
	 * argv[4] = optional "phys"
	 */

	if (argc < 4 || argc > 5) {
		Jim_WrongNumArgs(interp, 1, argv, "address width data ['phys']");
		return JIM_ERR;
	}

	/* Arg 1: Memory address. */
	int e;
	jim_wide wide_addr;
	e = Jim_GetWide(interp, argv[1], &wide_addr);

	if (e != JIM_OK)
		return e;

	target_addr_t addr = (target_addr_t)wide_addr;

	/* Arg 2: Bit width of one element. */
	long l;
	e = Jim_GetLong(interp, argv[2], &l);

	if (e != JIM_OK)
		return e;

	const unsigned int width_bits = l;
	size_t count = Jim_ListLength(interp, argv[3]);

	/* Arg 4: Optional 'phys'. */
	bool is_phys = false;

	if (argc > 4) {
		const char *phys = Jim_GetString(argv[4], NULL);

		if (strcmp(phys, "phys")) {
			Jim_SetResultFormatted(interp, "invalid argument '%s', must be 'phys'", phys);
			return JIM_ERR;
		}

		is_phys = true;
	}

	switch (width_bits) {
	case 8:
	case 16:
	case 32:
	case 64:
		break;
	default:
		Jim_SetResultString(interp, "invalid width, must be 8, 16, 32 or 64", -1);
		return JIM_ERR;
	}

	const unsigned int width = width_bits / 8;

	if ((addr + (count * width)) < addr) {
		Jim_SetResultString(interp, "write_memory: addr + len wraps to zero", -1);
		return JIM_ERR;
	}

	if (count > 65536) {
		Jim_SetResultString(interp, "write_memory: too large memory write request, exceeds 64K elements", -1);
		return JIM_ERR;
	}

	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx != NULL);
	struct target *target = get_current_target(cmd_ctx);

	const size_t buffersize = 4096;
	uint8_t *buffer = malloc(buffersize);

	if (!buffer) {
		LOG_ERROR("Failed to allocate memory");
		return JIM_ERR;
	}

	size_t j = 0;

	while (count > 0) {
		const unsigned int max_chunk_len = buffersize / width;
		const size_t chunk_len = MIN(count, max_chunk_len);

		for (size_t i = 0; i < chunk_len; i++, j++) {
			Jim_Obj *tmp = Jim_ListGetIndex(interp, argv[3], j);
			jim_wide element_wide;
			Jim_GetWide(interp, tmp, &element_wide);

			const uint64_t v = element_wide;

			switch (width) {
			case 8:
				target_buffer_set_u64(target, &buffer[i * width], v);
				break;
			case 4:
				target_buffer_set_u32(target, &buffer[i * width], v);
				break;
			case 2:
				target_buffer_set_u16(target, &buffer[i * width], v);
				break;
			case 1:
				buffer[i] = v & 0x0ff;
				break;
			}
		}

		count -= chunk_len;

		int retval;

		if (is_phys)
			retval = target_write_phys_memory(target, addr, width, chunk_len, buffer);
		else
			retval = target_write_memory(target, addr, width, chunk_len, buffer);

		if (retval != ERROR_OK) {
			LOG_ERROR("write_memory: write at " TARGET_ADDR_FMT " with width=%u and count=%zu failed",
				addr,  width_bits, chunk_len);
			Jim_SetResultString(interp, "write_memory: failed to write memory", -1);
			e = JIM_ERR;
			break;
		}

		addr += chunk_len * width;
	}

	free(buffer);

	return e;
}

/* FIX? should we propagate errors here rather than printing them
 * and continuing?
 */
void target_handle_event(struct target *target, enum target_event e)
{
	struct target_event_action *teap;
	int retval;

	for (teap = target->event_action; teap; teap = teap->next) {
		if (teap->event == e) {
			LOG_DEBUG("target(%d): %s (%s) event: %d (%s) action: %s",
					   target->target_number,
					   target_name(target),
					   target_type_name(target),
					   e,
					   target_event_name(e),
					   Jim_GetString(teap->body, NULL));

			/* Override current target by the target an event
			 * is issued from (lot of scripts need it).
			 * Return back to previous override as soon
			 * as the handler processing is done */
			struct command_context *cmd_ctx = current_command_context(teap->interp);
			struct target *saved_target_override = cmd_ctx->current_target_override;
			cmd_ctx->current_target_override = target;

			retval = Jim_EvalObj(teap->interp, teap->body);

			cmd_ctx->current_target_override = saved_target_override;

			if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
				return;

			if (retval == JIM_RETURN)
				retval = teap->interp->returnCode;

			if (retval != JIM_OK) {
				Jim_MakeErrorMessage(teap->interp);
				LOG_USER("Error executing event %s on target %s:\n%s",
						  target_event_name(e),
						  target_name(target),
						  Jim_GetString(Jim_GetResult(teap->interp), NULL));
				/* clean both error code and stacktrace before return */
				Jim_Eval(teap->interp, "error \"\" \"\"");
			}
		}
	}
}

static int target_jim_get_reg(Jim_Interp *interp, int argc,
		Jim_Obj * const *argv)
{
	bool force = false;

	if (argc == 3) {
		const char *option = Jim_GetString(argv[1], NULL);

		if (!strcmp(option, "-force")) {
			argc--;
			argv++;
			force = true;
		} else {
			Jim_SetResultFormatted(interp, "invalid option '%s'", option);
			return JIM_ERR;
		}
	}

	if (argc != 2) {
		Jim_WrongNumArgs(interp, 1, argv, "[-force] list");
		return JIM_ERR;
	}

	const int length = Jim_ListLength(interp, argv[1]);

	Jim_Obj *result_dict = Jim_NewDictObj(interp, NULL, 0);

	if (!result_dict)
		return JIM_ERR;

	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx != NULL);
	const struct target *target = get_current_target(cmd_ctx);

	for (int i = 0; i < length; i++) {
		Jim_Obj *elem = Jim_ListGetIndex(interp, argv[1], i);

		if (!elem)
			return JIM_ERR;

		const char *reg_name = Jim_String(elem);

		struct reg *reg = register_get_by_name(target->reg_cache, reg_name,
			false);

		if (!reg || !reg->exist) {
			Jim_SetResultFormatted(interp, "unknown register '%s'", reg_name);
			return JIM_ERR;
		}

		if (force) {
			int retval = reg->type->get(reg);

			if (retval != ERROR_OK) {
				Jim_SetResultFormatted(interp, "failed to read register '%s'",
					reg_name);
				return JIM_ERR;
			}
		}

		char *reg_value = buf_to_hex_str(reg->value, reg->size);

		if (!reg_value) {
			LOG_ERROR("Failed to allocate memory");
			return JIM_ERR;
		}

		char *tmp = alloc_printf("0x%s", reg_value);

		free(reg_value);

		if (!tmp) {
			LOG_ERROR("Failed to allocate memory");
			return JIM_ERR;
		}

		Jim_DictAddElement(interp, result_dict, elem,
			Jim_NewStringObj(interp, tmp, -1));

		free(tmp);
	}

	Jim_SetResult(interp, result_dict);

	return JIM_OK;
}

static int target_jim_set_reg(Jim_Interp *interp, int argc,
		Jim_Obj * const *argv)
{
	if (argc != 2) {
		Jim_WrongNumArgs(interp, 1, argv, "dict");
		return JIM_ERR;
	}

	int tmp;
#if JIM_VERSION >= 80
	Jim_Obj **dict = Jim_DictPairs(interp, argv[1], &tmp);

	if (!dict)
		return JIM_ERR;
#else
	Jim_Obj **dict;
	int ret = Jim_DictPairs(interp, argv[1], &dict, &tmp);

	if (ret != JIM_OK)
		return ret;
#endif

	const unsigned int length = tmp;
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	const struct target *target = get_current_target(cmd_ctx);

	for (unsigned int i = 0; i < length; i += 2) {
		const char *reg_name = Jim_String(dict[i]);
		const char *reg_value = Jim_String(dict[i + 1]);
		struct reg *reg = register_get_by_name(target->reg_cache, reg_name,
			false);

		if (!reg || !reg->exist) {
			Jim_SetResultFormatted(interp, "unknown register '%s'", reg_name);
			return JIM_ERR;
		}

		uint8_t *buf = malloc(DIV_ROUND_UP(reg->size, 8));

		if (!buf) {
			LOG_ERROR("Failed to allocate memory");
			return JIM_ERR;
		}

		str_to_buf(reg_value, strlen(reg_value), buf, reg->size, 0);
		int retval = reg->type->set(reg, buf);
		free(buf);

		if (retval != ERROR_OK) {
			Jim_SetResultFormatted(interp, "failed to set '%s' to register '%s'",
				reg_value, reg_name);
			return JIM_ERR;
		}
	}

	return JIM_OK;
}

/**
 * Returns true only if the target has a handler for the specified event.
 */
bool target_has_event_action(struct target *target, enum target_event event)
{
	struct target_event_action *teap;

	for (teap = target->event_action; teap; teap = teap->next) {
		if (teap->event == event)
			return true;
	}
	return false;
}

enum target_cfg_param {
	TCFG_TYPE,
	TCFG_EVENT,
	TCFG_WORK_AREA_VIRT,
	TCFG_WORK_AREA_PHYS,
	TCFG_WORK_AREA_SIZE,
	TCFG_WORK_AREA_BACKUP,
	TCFG_ENDIAN,
	TCFG_COREID,
	TCFG_CHAIN_POSITION,
	TCFG_DBGBASE,
	TCFG_RTOS,
	TCFG_DEFER_EXAMINE,
	TCFG_GDB_PORT,
	TCFG_GDB_MAX_CONNECTIONS,
};

static struct jim_nvp nvp_config_opts[] = {
	{ .name = "-type",             .value = TCFG_TYPE },
	{ .name = "-event",            .value = TCFG_EVENT },
	{ .name = "-work-area-virt",   .value = TCFG_WORK_AREA_VIRT },
	{ .name = "-work-area-phys",   .value = TCFG_WORK_AREA_PHYS },
	{ .name = "-work-area-size",   .value = TCFG_WORK_AREA_SIZE },
	{ .name = "-work-area-backup", .value = TCFG_WORK_AREA_BACKUP },
	{ .name = "-endian",           .value = TCFG_ENDIAN },
	{ .name = "-coreid",           .value = TCFG_COREID },
	{ .name = "-chain-position",   .value = TCFG_CHAIN_POSITION },
	{ .name = "-dbgbase",          .value = TCFG_DBGBASE },
	{ .name = "-rtos",             .value = TCFG_RTOS },
	{ .name = "-defer-examine",    .value = TCFG_DEFER_EXAMINE },
	{ .name = "-gdb-port",         .value = TCFG_GDB_PORT },
	{ .name = "-gdb-max-connections",   .value = TCFG_GDB_MAX_CONNECTIONS },
	{ .name = NULL, .value = -1 }
};

static int target_configure(struct jim_getopt_info *goi, struct target *target)
{
	struct jim_nvp *n;
	Jim_Obj *o;
	jim_wide w;
	int e;

	/* parse config or cget options ... */
	while (goi->argc > 0) {
		Jim_SetEmptyResult(goi->interp);
		/* jim_getopt_debug(goi); */

		if (target->type->target_jim_configure) {
			/* target defines a configure function */
			/* target gets first dibs on parameters */
			e = (*(target->type->target_jim_configure))(target, goi);
			if (e == JIM_OK) {
				/* more? */
				continue;
			}
			if (e == JIM_ERR) {
				/* An error */
				return e;
			}
			/* otherwise we 'continue' below */
		}
		e = jim_getopt_nvp(goi, nvp_config_opts, &n);
		if (e != JIM_OK) {
			jim_getopt_nvp_unknown(goi, nvp_config_opts, 0);
			return e;
		}
		switch (n->value) {
		case TCFG_TYPE:
			/* not settable */
			if (goi->isconfigure) {
				Jim_SetResultFormatted(goi->interp,
						"not settable: %s", n->name);
				return JIM_ERR;
			} else {
no_params:
				if (goi->argc != 0) {
					Jim_WrongNumArgs(goi->interp,
							goi->argc, goi->argv,
							"NO PARAMS");
					return JIM_ERR;
				}
			}
			Jim_SetResultString(goi->interp,
					target_type_name(target), -1);
			/* loop for more */
			break;
		case TCFG_EVENT:
			if (goi->argc == 0) {
				Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name? ...");
				return JIM_ERR;
			}

			e = jim_getopt_nvp(goi, nvp_target_event, &n);
			if (e != JIM_OK) {
				jim_getopt_nvp_unknown(goi, nvp_target_event, 1);
				return e;
			}

			if (goi->isconfigure) {
				if (goi->argc != 1) {
					Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name? ?EVENT-BODY?");
					return JIM_ERR;
				}
			} else {
				if (goi->argc != 0) {
					Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv, "-event ?event-name?");
					return JIM_ERR;
				}
			}

			{
				struct target_event_action *teap;

				teap = target->event_action;
				/* replace existing? */
				while (teap) {
					if (teap->event == (enum target_event)n->value)
						break;
					teap = teap->next;
				}

				if (goi->isconfigure) {
					/* START_DEPRECATED_TPIU */
					if (n->value == TARGET_EVENT_TRACE_CONFIG)
						LOG_INFO("DEPRECATED target event %s; use TPIU events {pre,post}-{enable,disable}", n->name);
					/* END_DEPRECATED_TPIU */

					bool replace = true;
					if (!teap) {
						/* create new */
						teap = calloc(1, sizeof(*teap));
						replace = false;
					}
					teap->event = n->value;
					teap->interp = goi->interp;
					jim_getopt_obj(goi, &o);
					if (teap->body)
						Jim_DecrRefCount(teap->interp, teap->body);
					teap->body  = Jim_DuplicateObj(goi->interp, o);
					/*
					 * FIXME:
					 *     Tcl/TK - "tk events" have a nice feature.
					 *     See the "BIND" command.
					 *    We should support that here.
					 *     You can specify %X and %Y in the event code.
					 *     The idea is: %T - target name.
					 *     The idea is: %N - target number
					 *     The idea is: %E - event name.
					 */
					Jim_IncrRefCount(teap->body);

					if (!replace) {
						/* add to head of event list */
						teap->next = target->event_action;
						target->event_action = teap;
					}
					Jim_SetEmptyResult(goi->interp);
				} else {
					/* get */
					if (!teap)
						Jim_SetEmptyResult(goi->interp);
					else
						Jim_SetResult(goi->interp, Jim_DuplicateObj(goi->interp, teap->body));
				}
			}
			/* loop for more */
			break;

		case TCFG_WORK_AREA_VIRT:
			if (goi->isconfigure) {
				target_free_all_working_areas(target);
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->working_area_virt = w;
				target->working_area_virt_spec = true;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->working_area_virt));
			/* loop for more */
			break;

		case TCFG_WORK_AREA_PHYS:
			if (goi->isconfigure) {
				target_free_all_working_areas(target);
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->working_area_phys = w;
				target->working_area_phys_spec = true;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->working_area_phys));
			/* loop for more */
			break;

		case TCFG_WORK_AREA_SIZE:
			if (goi->isconfigure) {
				target_free_all_working_areas(target);
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->working_area_size = w;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->working_area_size));
			/* loop for more */
			break;

		case TCFG_WORK_AREA_BACKUP:
			if (goi->isconfigure) {
				target_free_all_working_areas(target);
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				/* make this exactly 1 or 0 */
				target->backup_working_area = (!!w);
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->backup_working_area));
			/* loop for more e*/
			break;


		case TCFG_ENDIAN:
			if (goi->isconfigure) {
				e = jim_getopt_nvp(goi, nvp_target_endian, &n);
				if (e != JIM_OK) {
					jim_getopt_nvp_unknown(goi, nvp_target_endian, 1);
					return e;
				}
				target->endianness = n->value;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			n = jim_nvp_value2name_simple(nvp_target_endian, target->endianness);
			if (!n->name) {
				target->endianness = TARGET_LITTLE_ENDIAN;
				n = jim_nvp_value2name_simple(nvp_target_endian, target->endianness);
			}
			Jim_SetResultString(goi->interp, n->name, -1);
			/* loop for more */
			break;

		case TCFG_COREID:
			if (goi->isconfigure) {
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->coreid = (int32_t)w;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->coreid));
			/* loop for more */
			break;

		case TCFG_CHAIN_POSITION:
			if (goi->isconfigure) {
				Jim_Obj *o_t;
				struct jtag_tap *tap;

				if (target->has_dap) {
					Jim_SetResultString(goi->interp,
						"target requires -dap parameter instead of -chain-position!", -1);
					return JIM_ERR;
				}

				target_free_all_working_areas(target);
				e = jim_getopt_obj(goi, &o_t);
				if (e != JIM_OK)
					return e;
				tap = jtag_tap_by_jim_obj(goi->interp, o_t);
				if (!tap)
					return JIM_ERR;
				target->tap = tap;
				target->tap_configured = true;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResultString(goi->interp, target->tap->dotted_name, -1);
			/* loop for more e*/
			break;
		case TCFG_DBGBASE:
			if (goi->isconfigure) {
				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->dbgbase = (uint32_t)w;
				target->dbgbase_set = true;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->dbgbase));
			/* loop for more */
			break;
		case TCFG_RTOS:
			/* RTOS */
			{
				int result = rtos_create(goi, target);
				if (result != JIM_OK)
					return result;
			}
			/* loop for more */
			break;

		case TCFG_DEFER_EXAMINE:
			/* DEFER_EXAMINE */
			target->defer_examine = true;
			/* loop for more */
			break;

		case TCFG_GDB_PORT:
			if (goi->isconfigure) {
				struct command_context *cmd_ctx = current_command_context(goi->interp);
				if (cmd_ctx->mode != COMMAND_CONFIG) {
					Jim_SetResultString(goi->interp, "-gdb-port must be configured before 'init'", -1);
					return JIM_ERR;
				}

				const char *s;
				e = jim_getopt_string(goi, &s, NULL);
				if (e != JIM_OK)
					return e;
				free(target->gdb_port_override);
				target->gdb_port_override = strdup(s);
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResultString(goi->interp, target->gdb_port_override ? target->gdb_port_override : "undefined", -1);
			/* loop for more */
			break;

		case TCFG_GDB_MAX_CONNECTIONS:
			if (goi->isconfigure) {
				struct command_context *cmd_ctx = current_command_context(goi->interp);
				if (cmd_ctx->mode != COMMAND_CONFIG) {
					Jim_SetResultString(goi->interp, "-gdb-max-connections must be configured before 'init'", -1);
					return JIM_ERR;
				}

				e = jim_getopt_wide(goi, &w);
				if (e != JIM_OK)
					return e;
				target->gdb_max_connections = (w < 0) ? CONNECTION_LIMIT_UNLIMITED : (int)w;
			} else {
				if (goi->argc != 0)
					goto no_params;
			}
			Jim_SetResult(goi->interp, Jim_NewIntObj(goi->interp, target->gdb_max_connections));
			break;
		}
	} /* while (goi->argc) */


		/* done - we return */
	return JIM_OK;
}

static int jim_target_configure(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
{
	struct command *c = jim_to_command(interp);
	struct jim_getopt_info goi;

	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);
	goi.isconfigure = !strcmp(c->name, "configure");
	if (goi.argc < 1) {
		Jim_WrongNumArgs(goi.interp, goi.argc, goi.argv,
				 "missing: -option ...");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	return target_configure(&goi, target);
}

static int jim_target_mem2array(Jim_Interp *interp,
		int argc, Jim_Obj *const *argv)
{
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	return target_mem2array(interp, target, argc - 1, argv + 1);
}

static int jim_target_array2mem(Jim_Interp *interp,
		int argc, Jim_Obj *const *argv)
{
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	return target_array2mem(interp, target, argc - 1, argv + 1);
}

static int jim_target_tap_disabled(Jim_Interp *interp)
{
	Jim_SetResultFormatted(interp, "[TAP is disabled]");
	return JIM_ERR;
}

static int jim_target_examine(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	bool allow_defer = false;

	struct jim_getopt_info goi;
	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);
	if (goi.argc > 1) {
		const char *cmd_name = Jim_GetString(argv[0], NULL);
		Jim_SetResultFormatted(goi.interp,
				"usage: %s ['allow-defer']", cmd_name);
		return JIM_ERR;
	}
	if (goi.argc > 0 &&
	    strcmp(Jim_GetString(argv[1], NULL), "allow-defer") == 0) {
		/* consume it */
		Jim_Obj *obj;
		int e = jim_getopt_obj(&goi, &obj);
		if (e != JIM_OK)
			return e;
		allow_defer = true;
	}

	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	if (!target->tap->enabled)
		return jim_target_tap_disabled(interp);

	if (allow_defer && target->defer_examine) {
		LOG_INFO("Deferring arp_examine of %s", target_name(target));
		LOG_INFO("Use arp_examine command to examine it manually!");
		return JIM_OK;
	}

	int e = target->type->examine(target);
	if (e != ERROR_OK) {
		target_reset_examined(target);
		return JIM_ERR;
	}

	target_set_examined(target);

	return JIM_OK;
}

static int jim_target_was_examined(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
{
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);

	Jim_SetResultBool(interp, target_was_examined(target));
	return JIM_OK;
}

static int jim_target_examine_deferred(Jim_Interp *interp, int argc, Jim_Obj * const *argv)
{
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);

	Jim_SetResultBool(interp, target->defer_examine);
	return JIM_OK;
}

static int jim_target_halt_gdb(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "[no parameters]");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);

	if (target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT) != ERROR_OK)
		return JIM_ERR;

	return JIM_OK;
}

static int jim_target_poll(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "[no parameters]");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	if (!target->tap->enabled)
		return jim_target_tap_disabled(interp);

	int e;
	if (!(target_was_examined(target)))
		e = ERROR_TARGET_NOT_EXAMINED;
	else
		e = target->type->poll(target);
	if (e != ERROR_OK)
		return JIM_ERR;
	return JIM_OK;
}

static int jim_target_reset(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	struct jim_getopt_info goi;
	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);

	if (goi.argc != 2) {
		Jim_WrongNumArgs(interp, 0, argv,
				"([tT]|[fF]|assert|deassert) BOOL");
		return JIM_ERR;
	}

	struct jim_nvp *n;
	int e = jim_getopt_nvp(&goi, nvp_assert, &n);
	if (e != JIM_OK) {
		jim_getopt_nvp_unknown(&goi, nvp_assert, 1);
		return e;
	}
	/* the halt or not param */
	jim_wide a;
	e = jim_getopt_wide(&goi, &a);
	if (e != JIM_OK)
		return e;

	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	if (!target->tap->enabled)
		return jim_target_tap_disabled(interp);

	if (!target->type->assert_reset || !target->type->deassert_reset) {
		Jim_SetResultFormatted(interp,
				"No target-specific reset for %s",
				target_name(target));
		return JIM_ERR;
	}

	if (target->defer_examine)
		target_reset_examined(target);

	/* determine if we should halt or not. */
	target->reset_halt = (a != 0);
	/* When this happens - all workareas are invalid. */
	target_free_all_working_areas_restore(target, 0);

	/* do the assert */
	if (n->value == NVP_ASSERT)
		e = target->type->assert_reset(target);
	else
		e = target->type->deassert_reset(target);
	return (e == ERROR_OK) ? JIM_OK : JIM_ERR;
}

static int jim_target_halt(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "[no parameters]");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	if (!target->tap->enabled)
		return jim_target_tap_disabled(interp);
	int e = target->type->halt(target);
	return (e == ERROR_OK) ? JIM_OK : JIM_ERR;
}

static int jim_target_wait_state(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	struct jim_getopt_info goi;
	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);

	/* params:  <name>  statename timeoutmsecs */
	if (goi.argc != 2) {
		const char *cmd_name = Jim_GetString(argv[0], NULL);
		Jim_SetResultFormatted(goi.interp,
				"%s <state_name> <timeout_in_msec>", cmd_name);
		return JIM_ERR;
	}

	struct jim_nvp *n;
	int e = jim_getopt_nvp(&goi, nvp_target_state, &n);
	if (e != JIM_OK) {
		jim_getopt_nvp_unknown(&goi, nvp_target_state, 1);
		return e;
	}
	jim_wide a;
	e = jim_getopt_wide(&goi, &a);
	if (e != JIM_OK)
		return e;
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	if (!target->tap->enabled)
		return jim_target_tap_disabled(interp);

	e = target_wait_state(target, n->value, a);
	if (e != ERROR_OK) {
		Jim_Obj *obj = Jim_NewIntObj(interp, e);
		Jim_SetResultFormatted(goi.interp,
				"target: %s wait %s fails (%#s) %s",
				target_name(target), n->name,
				obj, target_strerror_safe(e));
		return JIM_ERR;
	}
	return JIM_OK;
}
/* List for human, Events defined for this target.
 * scripts/programs should use 'name cget -event NAME'
 */
COMMAND_HANDLER(handle_target_event_list)
{
	struct target *target = get_current_target(CMD_CTX);
	struct target_event_action *teap = target->event_action;

	command_print(CMD, "Event actions for target (%d) %s\n",
				   target->target_number,
				   target_name(target));
	command_print(CMD, "%-25s | Body", "Event");
	command_print(CMD, "------------------------- | "
			"----------------------------------------");
	while (teap) {
		command_print(CMD, "%-25s | %s",
				target_event_name(teap->event),
				Jim_GetString(teap->body, NULL));
		teap = teap->next;
	}
	command_print(CMD, "***END***");
	return ERROR_OK;
}
static int jim_target_current_state(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "[no parameters]");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	Jim_SetResultString(interp, target_state_name(target), -1);
	return JIM_OK;
}
static int jim_target_invoke_event(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	struct jim_getopt_info goi;
	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);
	if (goi.argc != 1) {
		const char *cmd_name = Jim_GetString(argv[0], NULL);
		Jim_SetResultFormatted(goi.interp, "%s <eventname>", cmd_name);
		return JIM_ERR;
	}
	struct jim_nvp *n;
	int e = jim_getopt_nvp(&goi, nvp_target_event, &n);
	if (e != JIM_OK) {
		jim_getopt_nvp_unknown(&goi, nvp_target_event, 1);
		return e;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);
	struct target *target = get_current_target(cmd_ctx);
	target_handle_event(target, n->value);
	return JIM_OK;
}

static const struct command_registration target_instance_command_handlers[] = {
	{
		.name = "configure",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_configure,
		.help  = "configure a new target for use",
		.usage = "[target_attribute ...]",
	},
	{
		.name = "cget",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_configure,
		.help  = "returns the specified target attribute",
		.usage = "target_attribute",
	},
	{
		.name = "mwd",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "Write 64-bit word(s) to target memory",
		.usage = "address data [count]",
	},
	{
		.name = "mww",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "Write 32-bit word(s) to target memory",
		.usage = "address data [count]",
	},
	{
		.name = "mwh",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "Write 16-bit half-word(s) to target memory",
		.usage = "address data [count]",
	},
	{
		.name = "mwb",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "Write byte(s) to target memory",
		.usage = "address data [count]",
	},
	{
		.name = "mdd",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "Display target memory as 64-bit words",
		.usage = "address [count]",
	},
	{
		.name = "mdw",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "Display target memory as 32-bit words",
		.usage = "address [count]",
	},
	{
		.name = "mdh",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "Display target memory as 16-bit half-words",
		.usage = "address [count]",
	},
	{
		.name = "mdb",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "Display target memory as 8-bit bytes",
		.usage = "address [count]",
	},
	{
		.name = "array2mem",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_array2mem,
		.help = "Writes Tcl array of 8/16/32 bit numbers "
			"to target memory",
		.usage = "arrayname bitwidth address count",
	},
	{
		.name = "mem2array",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_mem2array,
		.help = "Loads Tcl array of 8/16/32 bit numbers "
			"from target memory",
		.usage = "arrayname bitwidth address count",
	},
	{
		.name = "get_reg",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_get_reg,
		.help = "Get register values from the target",
		.usage = "list",
	},
	{
		.name = "set_reg",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_set_reg,
		.help = "Set target register values",
		.usage = "dict",
	},
	{
		.name = "read_memory",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_read_memory,
		.help = "Read Tcl list of 8/16/32/64 bit numbers from target memory",
		.usage = "address width count ['phys']",
	},
	{
		.name = "write_memory",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_write_memory,
		.help = "Write Tcl list of 8/16/32/64 bit numbers to target memory",
		.usage = "address width data ['phys']",
	},
	{
		.name = "eventlist",
		.handler = handle_target_event_list,
		.mode = COMMAND_EXEC,
		.help = "displays a table of events defined for this target",
		.usage = "",
	},
	{
		.name = "curstate",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_current_state,
		.help = "displays the current state of this target",
	},
	{
		.name = "arp_examine",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_examine,
		.help = "used internally for reset processing",
		.usage = "['allow-defer']",
	},
	{
		.name = "was_examined",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_was_examined,
		.help = "used internally for reset processing",
	},
	{
		.name = "examine_deferred",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_examine_deferred,
		.help = "used internally for reset processing",
	},
	{
		.name = "arp_halt_gdb",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_halt_gdb,
		.help = "used internally for reset processing to halt GDB",
	},
	{
		.name = "arp_poll",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_poll,
		.help = "used internally for reset processing",
	},
	{
		.name = "arp_reset",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_reset,
		.help = "used internally for reset processing",
	},
	{
		.name = "arp_halt",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_halt,
		.help = "used internally for reset processing",
	},
	{
		.name = "arp_waitstate",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_wait_state,
		.help = "used internally for reset processing",
	},
	{
		.name = "invoke-event",
		.mode = COMMAND_EXEC,
		.jim_handler = jim_target_invoke_event,
		.help = "invoke handler for specified event",
		.usage = "event_name",
	},
	COMMAND_REGISTRATION_DONE
};

static int target_create(struct jim_getopt_info *goi)
{
	Jim_Obj *new_cmd;
	Jim_Cmd *cmd;
	const char *cp;
	int e;
	int x;
	struct target *target;
	struct command_context *cmd_ctx;

	cmd_ctx = current_command_context(goi->interp);
	assert(cmd_ctx);

	if (goi->argc < 3) {
		Jim_WrongNumArgs(goi->interp, 1, goi->argv, "?name? ?type? ..options...");
		return JIM_ERR;
	}

	/* COMMAND */
	jim_getopt_obj(goi, &new_cmd);
	/* does this command exist? */
	cmd = Jim_GetCommand(goi->interp, new_cmd, JIM_NONE);
	if (cmd) {
		cp = Jim_GetString(new_cmd, NULL);
		Jim_SetResultFormatted(goi->interp, "Command/target: %s Exists", cp);
		return JIM_ERR;
	}

	/* TYPE */
	e = jim_getopt_string(goi, &cp, NULL);
	if (e != JIM_OK)
		return e;
	struct transport *tr = get_current_transport();
	if (tr->override_target) {
		e = tr->override_target(&cp);
		if (e != ERROR_OK) {
			LOG_ERROR("The selected transport doesn't support this target");
			return JIM_ERR;
		}
		LOG_INFO("The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD");
	}
	/* now does target type exist */
	for (x = 0 ; target_types[x] ; x++) {
		if (strcmp(cp, target_types[x]->name) == 0) {
			/* found */
			break;
		}
	}
	if (!target_types[x]) {
		Jim_SetResultFormatted(goi->interp, "Unknown target type %s, try one of ", cp);
		for (x = 0 ; target_types[x] ; x++) {
			if (target_types[x + 1]) {
				Jim_AppendStrings(goi->interp,
								   Jim_GetResult(goi->interp),
								   target_types[x]->name,
								   ", ", NULL);
			} else {
				Jim_AppendStrings(goi->interp,
								   Jim_GetResult(goi->interp),
								   " or ",
								   target_types[x]->name, NULL);
			}
		}
		return JIM_ERR;
	}

	/* Create it */
	target = calloc(1, sizeof(struct target));
	if (!target) {
		LOG_ERROR("Out of memory");
		return JIM_ERR;
	}

	/* set empty smp cluster */
	target->smp_targets = &empty_smp_targets;

	/* set target number */
	target->target_number = new_target_number();

	/* allocate memory for each unique target type */
	target->type = malloc(sizeof(struct target_type));
	if (!target->type) {
		LOG_ERROR("Out of memory");
		free(target);
		return JIM_ERR;
	}

	memcpy(target->type, target_types[x], sizeof(struct target_type));

	/* default to first core, override with -coreid */
	target->coreid = 0;

	target->working_area        = 0x0;
	target->working_area_size   = 0x0;
	target->working_areas       = NULL;
	target->backup_working_area = 0;

	target->state               = TARGET_UNKNOWN;
	target->debug_reason        = DBG_REASON_UNDEFINED;
	target->reg_cache           = NULL;
	target->breakpoints         = NULL;
	target->watchpoints         = NULL;
	target->next                = NULL;
	target->arch_info           = NULL;

	target->verbose_halt_msg	= true;

	target->halt_issued			= false;

	/* initialize trace information */
	target->trace_info = calloc(1, sizeof(struct trace));
	if (!target->trace_info) {
		LOG_ERROR("Out of memory");
		free(target->type);
		free(target);
		return JIM_ERR;
	}

	target->dbgmsg          = NULL;
	target->dbg_msg_enabled = 0;

	target->endianness = TARGET_ENDIAN_UNKNOWN;

	target->rtos = NULL;
	target->rtos_auto_detect = false;

	target->gdb_port_override = NULL;
	target->gdb_max_connections = 1;

	/* Do the rest as "configure" options */
	goi->isconfigure = 1;
	e = target_configure(goi, target);

	if (e == JIM_OK) {
		if (target->has_dap) {
			if (!target->dap_configured) {
				Jim_SetResultString(goi->interp, "-dap ?name? required when creating target", -1);
				e = JIM_ERR;
			}
		} else {
			if (!target->tap_configured) {
				Jim_SetResultString(goi->interp, "-chain-position ?name? required when creating target", -1);
				e = JIM_ERR;
			}
		}
		/* tap must be set after target was configured */
		if (!target->tap)
			e = JIM_ERR;
	}

	if (e != JIM_OK) {
		rtos_destroy(target);
		free(target->gdb_port_override);
		free(target->trace_info);
		free(target->type);
		free(target);
		return e;
	}

	if (target->endianness == TARGET_ENDIAN_UNKNOWN) {
		/* default endian to little if not specified */
		target->endianness = TARGET_LITTLE_ENDIAN;
	}

	cp = Jim_GetString(new_cmd, NULL);
	target->cmd_name = strdup(cp);
	if (!target->cmd_name) {
		LOG_ERROR("Out of memory");
		rtos_destroy(target);
		free(target->gdb_port_override);
		free(target->trace_info);
		free(target->type);
		free(target);
		return JIM_ERR;
	}

	if (target->type->target_create) {
		e = (*(target->type->target_create))(target, goi->interp);
		if (e != ERROR_OK) {
			LOG_DEBUG("target_create failed");
			free(target->cmd_name);
			rtos_destroy(target);
			free(target->gdb_port_override);
			free(target->trace_info);
			free(target->type);
			free(target);
			return JIM_ERR;
		}
	}

	/* create the target specific commands */
	if (target->type->commands) {
		e = register_commands(cmd_ctx, NULL, target->type->commands);
		if (e != ERROR_OK)
			LOG_ERROR("unable to register '%s' commands", cp);
	}

	/* now - create the new target name command */
	const struct command_registration target_subcommands[] = {
		{
			.chain = target_instance_command_handlers,
		},
		{
			.chain = target->type->commands,
		},
		COMMAND_REGISTRATION_DONE
	};
	const struct command_registration target_commands[] = {
		{
			.name = cp,
			.mode = COMMAND_ANY,
			.help = "target command group",
			.usage = "",
			.chain = target_subcommands,
		},
		COMMAND_REGISTRATION_DONE
	};
	e = register_commands_override_target(cmd_ctx, NULL, target_commands, target);
	if (e != ERROR_OK) {
		if (target->type->deinit_target)
			target->type->deinit_target(target);
		free(target->cmd_name);
		rtos_destroy(target);
		free(target->gdb_port_override);
		free(target->trace_info);
		free(target->type);
		free(target);
		return JIM_ERR;
	}

	/* append to end of list */
	append_to_list_all_targets(target);

	cmd_ctx->current_target = target;
	return JIM_OK;
}

static int jim_target_current(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "Too many parameters");
		return JIM_ERR;
	}
	struct command_context *cmd_ctx = current_command_context(interp);
	assert(cmd_ctx);

	struct target *target = get_current_target_or_null(cmd_ctx);
	if (target)
		Jim_SetResultString(interp, target_name(target), -1);
	return JIM_OK;
}

static int jim_target_types(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "Too many parameters");
		return JIM_ERR;
	}
	Jim_SetResult(interp, Jim_NewListObj(interp, NULL, 0));
	for (unsigned x = 0; target_types[x]; x++) {
		Jim_ListAppendElement(interp, Jim_GetResult(interp),
			Jim_NewStringObj(interp, target_types[x]->name, -1));
	}
	return JIM_OK;
}

static int jim_target_names(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	if (argc != 1) {
		Jim_WrongNumArgs(interp, 1, argv, "Too many parameters");
		return JIM_ERR;
	}
	Jim_SetResult(interp, Jim_NewListObj(interp, NULL, 0));
	struct target *target = all_targets;
	while (target) {
		Jim_ListAppendElement(interp, Jim_GetResult(interp),
			Jim_NewStringObj(interp, target_name(target), -1));
		target = target->next;
	}
	return JIM_OK;
}

static int jim_target_smp(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	int i;
	const char *targetname;
	int retval, len;
	struct target *target = NULL;
	struct target_list *head, *new;

	retval = 0;
	LOG_DEBUG("%d", argc);
	/* argv[1] = target to associate in smp
	 * argv[2] = target to associate in smp
	 * argv[3] ...
	 */

	struct list_head *lh = malloc(sizeof(*lh));
	if (!lh) {
		LOG_ERROR("Out of memory");
		return JIM_ERR;
	}
	INIT_LIST_HEAD(lh);

	for (i = 1; i < argc; i++) {

		targetname = Jim_GetString(argv[i], &len);
		target = get_target(targetname);
		LOG_DEBUG("%s ", targetname);
		if (target) {
			new = malloc(sizeof(struct target_list));
			new->target = target;
			list_add_tail(&new->lh, lh);
		}
	}
	/*  now parse the list of cpu and put the target in smp mode*/
	foreach_smp_target(head, lh) {
		target = head->target;
		target->smp = 1;
		target->smp_targets = lh;
	}

	if (target && target->rtos)
		retval = rtos_smp_init(target);

	return retval;
}


static int jim_target_create(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
{
	struct jim_getopt_info goi;
	jim_getopt_setup(&goi, interp, argc - 1, argv + 1);
	if (goi.argc < 3) {
		Jim_WrongNumArgs(goi.interp, goi.argc, goi.argv,
			"<name> <target_type> [<target_options> ...]");
		return JIM_ERR;
	}
	return target_create(&goi);
}

static const struct command_registration target_subcommand_handlers[] = {
	{
		.name = "init",
		.mode = COMMAND_CONFIG,
		.handler = handle_target_init_command,
		.help = "initialize targets",
		.usage = "",
	},
	{
		.name = "create",
		.mode = COMMAND_CONFIG,
		.jim_handler = jim_target_create,
		.usage = "name type '-chain-position' name [options ...]",
		.help = "Creates and selects a new target",
	},
	{
		.name = "current",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_current,
		.help = "Returns the currently selected target",
	},
	{
		.name = "types",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_types,
		.help = "Returns the available target types as "
				"a list of strings",
	},
	{
		.name = "names",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_names,
		.help = "Returns the names of all targets as a list of strings",
	},
	{
		.name = "smp",
		.mode = COMMAND_ANY,
		.jim_handler = jim_target_smp,
		.usage = "targetname1 targetname2 ...",
		.help = "gather several target in a smp list"
	},

	COMMAND_REGISTRATION_DONE
};

struct fast_load {
	target_addr_t address;
	uint8_t *data;
	int length;

};

static int fastload_num;
static struct fast_load *fastload;

static void free_fastload(void)
{
	if (fastload) {
		for (int i = 0; i < fastload_num; i++)
			free(fastload[i].data);
		free(fastload);
		fastload = NULL;
	}
}

COMMAND_HANDLER(handle_fast_load_image_command)
{
	uint8_t *buffer;
	size_t buf_cnt;
	uint32_t image_size;
	target_addr_t min_address = 0;
	target_addr_t max_address = -1;

	struct image image;

	int retval = CALL_COMMAND_HANDLER(parse_load_image_command,
			&image, &min_address, &max_address);
	if (retval != ERROR_OK)
		return retval;

	struct duration bench;
	duration_start(&bench);

	retval = image_open(&image, CMD_ARGV[0], (CMD_ARGC >= 3) ? CMD_ARGV[2] : NULL);
	if (retval != ERROR_OK)
		return retval;

	image_size = 0x0;
	retval = ERROR_OK;
	fastload_num = image.num_sections;
	fastload = malloc(sizeof(struct fast_load)*image.num_sections);
	if (!fastload) {
		command_print(CMD, "out of memory");
		image_close(&image);
		return ERROR_FAIL;
	}
	memset(fastload, 0, sizeof(struct fast_load)*image.num_sections);
	for (unsigned int i = 0; i < image.num_sections; i++) {
		buffer = malloc(image.sections[i].size);
		if (!buffer) {
			command_print(CMD, "error allocating buffer for section (%d bytes)",
						  (int)(image.sections[i].size));
			retval = ERROR_FAIL;
			break;
		}

		retval = image_read_section(&image, i, 0x0, image.sections[i].size, buffer, &buf_cnt);
		if (retval != ERROR_OK) {
			free(buffer);
			break;
		}

		uint32_t offset = 0;
		uint32_t length = buf_cnt;

		/* DANGER!!! beware of unsigned comparison here!!! */

		if ((image.sections[i].base_address + buf_cnt >= min_address) &&
				(image.sections[i].base_address < max_address)) {
			if (image.sections[i].base_address < min_address) {
				/* clip addresses below */
				offset += min_address-image.sections[i].base_address;
				length -= offset;
			}

			if (image.sections[i].base_address + buf_cnt > max_address)
				length -= (image.sections[i].base_address + buf_cnt)-max_address;

			fastload[i].address = image.sections[i].base_address + offset;
			fastload[i].data = malloc(length);
			if (!fastload[i].data) {
				free(buffer);
				command_print(CMD, "error allocating buffer for section (%" PRIu32 " bytes)",
							  length);
				retval = ERROR_FAIL;
				break;
			}
			memcpy(fastload[i].data, buffer + offset, length);
			fastload[i].length = length;

			image_size += length;
			command_print(CMD, "%u bytes written at address 0x%8.8x",
						  (unsigned int)length,
						  ((unsigned int)(image.sections[i].base_address + offset)));
		}

		free(buffer);
	}

	if ((retval == ERROR_OK) && (duration_measure(&bench) == ERROR_OK)) {
		command_print(CMD, "Loaded %" PRIu32 " bytes "
				"in %fs (%0.3f KiB/s)", image_size,
				duration_elapsed(&bench), duration_kbps(&bench, image_size));

		command_print(CMD,
				"WARNING: image has not been loaded to target!"
				"You can issue a 'fast_load' to finish loading.");
	}

	image_close(&image);

	if (retval != ERROR_OK)
		free_fastload();

	return retval;
}

COMMAND_HANDLER(handle_fast_load_command)
{
	if (CMD_ARGC > 0)
		return ERROR_COMMAND_SYNTAX_ERROR;
	if (!fastload) {
		LOG_ERROR("No image in memory");
		return ERROR_FAIL;
	}
	int i;
	int64_t ms = timeval_ms();
	int size = 0;
	int retval = ERROR_OK;
	for (i = 0; i < fastload_num; i++) {
		struct target *target = get_current_target(CMD_CTX);
		command_print(CMD, "Write to 0x%08x, length 0x%08x",
					  (unsigned int)(fastload[i].address),
					  (unsigned int)(fastload[i].length));
		retval = target_write_buffer(target, fastload[i].address, fastload[i].length, fastload[i].data);
		if (retval != ERROR_OK)
			break;
		size += fastload[i].length;
	}
	if (retval == ERROR_OK) {
		int64_t after = timeval_ms();
		command_print(CMD, "Loaded image %f kBytes/s", (float)(size/1024.0)/((float)(after-ms)/1000.0));
	}
	return retval;
}

static const struct command_registration target_command_handlers[] = {
	{
		.name = "targets",
		.handler = handle_targets_command,
		.mode = COMMAND_ANY,
		.help = "change current default target (one parameter) "
			"or prints table of all targets (no parameters)",
		.usage = "[target]",
	},
	{
		.name = "target",
		.mode = COMMAND_CONFIG,
		.help = "configure target",
		.chain = target_subcommand_handlers,
		.usage = "",
	},
	COMMAND_REGISTRATION_DONE
};

int target_register_commands(struct command_context *cmd_ctx)
{
	return register_commands(cmd_ctx, NULL, target_command_handlers);
}

static bool target_reset_nag = true;

bool get_target_reset_nag(void)
{
	return target_reset_nag;
}

COMMAND_HANDLER(handle_target_reset_nag)
{
	return CALL_COMMAND_HANDLER(handle_command_parse_bool,
			&target_reset_nag, "Nag after each reset about options to improve "
			"performance");
}

COMMAND_HANDLER(handle_ps_command)
{
	struct target *target = get_current_target(CMD_CTX);
	char *display;
	if (target->state != TARGET_HALTED) {
		LOG_INFO("target not halted !!");
		return ERROR_OK;
	}

	if ((target->rtos) && (target->rtos->type)
			&& (target->rtos->type->ps_command)) {
		display = target->rtos->type->ps_command(target);
		command_print(CMD, "%s", display);
		free(display);
		return ERROR_OK;
	} else {
		LOG_INFO("failed");
		return ERROR_TARGET_FAILURE;
	}
}

static void binprint(struct command_invocation *cmd, const char *text, const uint8_t *buf, int size)
{
	if (text)
		command_print_sameline(cmd, "%s", text);
	for (int i = 0; i < size; i++)
		command_print_sameline(cmd, " %02x", buf[i]);
	command_print(cmd, " ");
}

COMMAND_HANDLER(handle_test_mem_access_command)
{
	struct target *target = get_current_target(CMD_CTX);
	uint32_t test_size;
	int retval = ERROR_OK;

	if (target->state != TARGET_HALTED) {
		LOG_INFO("target not halted !!");
		return ERROR_FAIL;
	}

	if (CMD_ARGC != 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], test_size);

	/* Test reads */
	size_t num_bytes = test_size + 4;

	struct working_area *wa = NULL;
	retval = target_alloc_working_area(target, num_bytes, &wa);
	if (retval != ERROR_OK) {
		LOG_ERROR("Not enough working area");
		return ERROR_FAIL;
	}

	uint8_t *test_pattern = malloc(num_bytes);

	for (size_t i = 0; i < num_bytes; i++)
		test_pattern[i] = rand();

	retval = target_write_memory(target, wa->address, 1, num_bytes, test_pattern);
	if (retval != ERROR_OK) {
		LOG_ERROR("Test pattern write failed");
		goto out;
	}

	for (int host_offset = 0; host_offset <= 1; host_offset++) {
		for (int size = 1; size <= 4; size *= 2) {
			for (int offset = 0; offset < 4; offset++) {
				uint32_t count = test_size / size;
				size_t host_bufsiz = (count + 2) * size + host_offset;
				uint8_t *read_ref = malloc(host_bufsiz);
				uint8_t *read_buf = malloc(host_bufsiz);

				for (size_t i = 0; i < host_bufsiz; i++) {
					read_ref[i] = rand();
					read_buf[i] = read_ref[i];
				}
				command_print_sameline(CMD,
						"Test read %" PRIu32 " x %d @ %d to %saligned buffer: ", count,
						size, offset, host_offset ? "un" : "");

				struct duration bench;
				duration_start(&bench);

				retval = target_read_memory(target, wa->address + offset, size, count,
						read_buf + size + host_offset);

				duration_measure(&bench);

				if (retval == ERROR_TARGET_UNALIGNED_ACCESS) {
					command_print(CMD, "Unsupported alignment");
					goto next;
				} else if (retval != ERROR_OK) {
					command_print(CMD, "Memory read failed");
					goto next;
				}

				/* replay on host */
				memcpy(read_ref + size + host_offset, test_pattern + offset, count * size);

				/* check result */
				int result = memcmp(read_ref, read_buf, host_bufsiz);
				if (result == 0) {
					command_print(CMD, "Pass in %fs (%0.3f KiB/s)",
							duration_elapsed(&bench),
							duration_kbps(&bench, count * size));
				} else {
					command_print(CMD, "Compare failed");
					binprint(CMD, "ref:", read_ref, host_bufsiz);
					binprint(CMD, "buf:", read_buf, host_bufsiz);
				}
next:
				free(read_ref);
				free(read_buf);
			}
		}
	}

out:
	free(test_pattern);

	target_free_working_area(target, wa);

	/* Test writes */
	num_bytes = test_size + 4 + 4 + 4;

	retval = target_alloc_working_area(target, num_bytes, &wa);
	if (retval != ERROR_OK) {
		LOG_ERROR("Not enough working area");
		return ERROR_FAIL;
	}

	test_pattern = malloc(num_bytes);

	for (size_t i = 0; i < num_bytes; i++)
		test_pattern[i] = rand();

	for (int host_offset = 0; host_offset <= 1; host_offset++) {
		for (int size = 1; size <= 4; size *= 2) {
			for (int offset = 0; offset < 4; offset++) {
				uint32_t count = test_size / size;
				size_t host_bufsiz = count * size + host_offset;
				uint8_t *read_ref = malloc(num_bytes);
				uint8_t *read_buf = malloc(num_bytes);
				uint8_t *write_buf = malloc(host_bufsiz);

				for (size_t i = 0; i < host_bufsiz; i++)
					write_buf[i] = rand();
				command_print_sameline(CMD,
						"Test write %" PRIu32 " x %d @ %d from %saligned buffer: ", count,
						size, offset, host_offset ? "un" : "");

				retval = target_write_memory(target, wa->address, 1, num_bytes, test_pattern);
				if (retval != ERROR_OK) {
					command_print(CMD, "Test pattern write failed");
					goto nextw;
				}

				/* replay on host */
				memcpy(read_ref, test_pattern, num_bytes);
				memcpy(read_ref + size + offset, write_buf + host_offset, count * size);

				struct duration bench;
				duration_start(&bench);

				retval = target_write_memory(target, wa->address + size + offset, size, count,
						write_buf + host_offset);

				duration_measure(&bench);

				if (retval == ERROR_TARGET_UNALIGNED_ACCESS) {
					command_print(CMD, "Unsupported alignment");
					goto nextw;
				} else if (retval != ERROR_OK) {
					command_print(CMD, "Memory write failed");
					goto nextw;
				}

				/* read back */
				retval = target_read_memory(target, wa->address, 1, num_bytes, read_buf);
				if (retval != ERROR_OK) {
					command_print(CMD, "Test pattern write failed");
					goto nextw;
				}

				/* check result */
				int result = memcmp(read_ref, read_buf, num_bytes);
				if (result == 0) {
					command_print(CMD, "Pass in %fs (%0.3f KiB/s)",
							duration_elapsed(&bench),
							duration_kbps(&bench, count * size));
				} else {
					command_print(CMD, "Compare failed");
					binprint(CMD, "ref:", read_ref, num_bytes);
					binprint(CMD, "buf:", read_buf, num_bytes);
				}
nextw:
				free(read_ref);
				free(read_buf);
			}
		}
	}

	free(test_pattern);

	target_free_working_area(target, wa);
	return retval;
}

static const struct command_registration target_exec_command_handlers[] = {
	{
		.name = "fast_load_image",
		.handler = handle_fast_load_image_command,
		.mode = COMMAND_ANY,
		.help = "Load image into server memory for later use by "
			"fast_load; primarily for profiling",
		.usage = "filename address ['bin'|'ihex'|'elf'|'s19'] "
			"[min_address [max_length]]",
	},
	{
		.name = "fast_load",
		.handler = handle_fast_load_command,
		.mode = COMMAND_EXEC,
		.help = "loads active fast load image to current target "
			"- mainly for profiling purposes",
		.usage = "",
	},
	{
		.name = "profile",
		.handler = handle_profile_command,
		.mode = COMMAND_EXEC,
		.usage = "seconds filename [start end]",
		.help = "profiling samples the CPU PC",
	},
	/** @todo don't register virt2phys() unless target supports it */
	{
		.name = "virt2phys",
		.handler = handle_virt2phys_command,
		.mode = COMMAND_ANY,
		.help = "translate a virtual address into a physical address",
		.usage = "virtual_address",
	},
	{
		.name = "reg",
		.handler = handle_reg_command,
		.mode = COMMAND_EXEC,
		.help = "display (reread from target with \"force\") or set a register; "
			"with no arguments, displays all registers and their values",
		.usage = "[(register_number|register_name) [(value|'force')]]",
	},
	{
		.name = "poll",
		.handler = handle_poll_command,
		.mode = COMMAND_EXEC,
		.help = "poll target state; or reconfigure background polling",
		.usage = "['on'|'off']",
	},
	{
		.name = "wait_halt",
		.handler = handle_wait_halt_command,
		.mode = COMMAND_EXEC,
		.help = "wait up to the specified number of milliseconds "
			"(default 5000) for a previously requested halt",
		.usage = "[milliseconds]",
	},
	{
		.name = "halt",
		.handler = handle_halt_command,
		.mode = COMMAND_EXEC,
		.help = "request target to halt, then wait up to the specified "
			"number of milliseconds (default 5000) for it to complete",
		.usage = "[milliseconds]",
	},
	{
		.name = "resume",
		.handler = handle_resume_command,
		.mode = COMMAND_EXEC,
		.help =	"resume target execution from current PC or address",
		.usage = "[address]",
	},
	{
		.name = "reset",
		.handler = handle_reset_command,
		.mode = COMMAND_EXEC,
		.usage = "[run|halt|init]",
		.help = "Reset all targets into the specified mode. "
			"Default reset mode is run, if not given.",
	},
	{
		.name = "soft_reset_halt",
		.handler = handle_soft_reset_halt_command,
		.mode = COMMAND_EXEC,
		.usage = "",
		.help = "halt the target and do a soft reset",
	},
	{
		.name = "step",
		.handler = handle_step_command,
		.mode = COMMAND_EXEC,
		.help =	"step one instruction from current PC or address",
		.usage = "[address]",
	},
	{
		.name = "mdd",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "display memory double-words",
		.usage = "['phys'] address [count]",
	},
	{
		.name = "mdw",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "display memory words",
		.usage = "['phys'] address [count]",
	},
	{
		.name = "mdh",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "display memory half-words",
		.usage = "['phys'] address [count]",
	},
	{
		.name = "mdb",
		.handler = handle_md_command,
		.mode = COMMAND_EXEC,
		.help = "display memory bytes",
		.usage = "['phys'] address [count]",
	},
	{
		.name = "mwd",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "write memory double-word",
		.usage = "['phys'] address value [count]",
	},
	{
		.name = "mww",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "write memory word",
		.usage = "['phys'] address value [count]",
	},
	{
		.name = "mwh",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "write memory half-word",
		.usage = "['phys'] address value [count]",
	},
	{
		.name = "mwb",
		.handler = handle_mw_command,
		.mode = COMMAND_EXEC,
		.help = "write memory byte",
		.usage = "['phys'] address value [count]",
	},
	{
		.name = "bp",
		.handler = handle_bp_command,
		.mode = COMMAND_EXEC,
		.help = "list or set hardware or software breakpoint",
		.usage = "[<address> [<asid>] <length> ['hw'|'hw_ctx']]",
	},
	{
		.name = "rbp",
		.handler = handle_rbp_command,
		.mode = COMMAND_EXEC,
		.help = "remove breakpoint",
		.usage = "'all' | address",
	},
	{
		.name = "wp",
		.handler = handle_wp_command,
		.mode = COMMAND_EXEC,
		.help = "list (no params) or create watchpoints",
		.usage = "[address length [('r'|'w'|'a') value [mask]]]",
	},
	{
		.name = "rwp",
		.handler = handle_rwp_command,
		.mode = COMMAND_EXEC,
		.help = "remove watchpoint",
		.usage = "address",
	},
	{
		.name = "load_image",
		.handler = handle_load_image_command,
		.mode = COMMAND_EXEC,
		.usage = "filename address ['bin'|'ihex'|'elf'|'s19'] "
			"[min_address] [max_length]",
	},
	{
		.name = "dump_image",
		.handler = handle_dump_image_command,
		.mode = COMMAND_EXEC,
		.usage = "filename address size",
	},
	{
		.name = "verify_image_checksum",
		.handler = handle_verify_image_checksum_command,
		.mode = COMMAND_EXEC,
		.usage = "filename [offset [type]]",
	},
	{
		.name = "verify_image",
		.handler = handle_verify_image_command,
		.mode = COMMAND_EXEC,
		.usage = "filename [offset [type]]",
	},
	{
		.name = "test_image",
		.handler = handle_test_image_command,
		.mode = COMMAND_EXEC,
		.usage = "filename [offset [type]]",
	},
	{
		.name = "get_reg",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_get_reg,
		.help = "Get register values from the target",
		.usage = "list",
	},
	{
		.name = "set_reg",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_set_reg,
		.help = "Set target register values",
		.usage = "dict",
	},
	{
		.name = "read_memory",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_read_memory,
		.help = "Read Tcl list of 8/16/32/64 bit numbers from target memory",
		.usage = "address width count ['phys']",
	},
	{
		.name = "write_memory",
		.mode = COMMAND_EXEC,
		.jim_handler = target_jim_write_memory,
		.help = "Write Tcl list of 8/16/32/64 bit numbers to target memory",
		.usage = "address width data ['phys']",
	},
	{
		.name = "reset_nag",
		.handler = handle_target_reset_nag,
		.mode = COMMAND_ANY,
		.help = "Nag after each reset about options that could have been "
				"enabled to improve performance.",
		.usage = "['enable'|'disable']",
	},
	{
		.name = "ps",
		.handler = handle_ps_command,
		.mode = COMMAND_EXEC,
		.help = "list all tasks",
		.usage = "",
	},
	{
		.name = "test_mem_access",
		.handler = handle_test_mem_access_command,
		.mode = COMMAND_EXEC,
		.help = "Test the target's memory access functions",
		.usage = "size",
	},

	COMMAND_REGISTRATION_DONE
};
static int target_register_user_commands(struct command_context *cmd_ctx)
{
	int retval = ERROR_OK;
	retval = target_request_register_commands(cmd_ctx);
	if (retval != ERROR_OK)
		return retval;

	retval = trace_register_commands(cmd_ctx);
	if (retval != ERROR_OK)
		return retval;


	return register_commands(cmd_ctx, NULL, target_exec_command_handlers);
}