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openocd/src/target/mips_m4k.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/***************************************************************************
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2008 by David T.L. Wong *
* *
* Copyright (C) 2009 by David N. Claffey <dnclaffey@gmail.com> *
* *
* Copyright (C) 2011 by Drasko DRASKOVIC *
* drasko.draskovic@gmail.com *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "breakpoints.h"
#include "mips32.h"
#include "mips_m4k.h"
#include "mips32_dmaacc.h"
#include "target_type.h"
#include "register.h"
#include "smp.h"
static void mips_m4k_enable_breakpoints(struct target *target);
static void mips_m4k_enable_watchpoints(struct target *target);
static int mips_m4k_set_breakpoint(struct target *target,
struct breakpoint *breakpoint);
static int mips_m4k_unset_breakpoint(struct target *target,
struct breakpoint *breakpoint);
static int mips_m4k_internal_restore(struct target *target, int current,
target_addr_t address, int handle_breakpoints,
int debug_execution);
static int mips_m4k_halt(struct target *target);
static int mips_m4k_bulk_write_memory(struct target *target, target_addr_t address,
uint32_t count, const uint8_t *buffer);
static int mips_m4k_examine_debug_reason(struct target *target)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
uint32_t break_status;
int retval;
if ((target->debug_reason != DBG_REASON_DBGRQ)
&& (target->debug_reason != DBG_REASON_SINGLESTEP)) {
if (ejtag_info->debug_caps & EJTAG_DCR_IB) {
/* get info about inst breakpoint support */
retval = target_read_u32(target,
ejtag_info->ejtag_ibs_addr, &break_status);
if (retval != ERROR_OK)
return retval;
if (break_status & 0x1f) {
/* we have halted on a breakpoint */
retval = target_write_u32(target,
ejtag_info->ejtag_ibs_addr, 0);
if (retval != ERROR_OK)
return retval;
target->debug_reason = DBG_REASON_BREAKPOINT;
}
}
if (ejtag_info->debug_caps & EJTAG_DCR_DB) {
/* get info about data breakpoint support */
retval = target_read_u32(target,
ejtag_info->ejtag_dbs_addr, &break_status);
if (retval != ERROR_OK)
return retval;
if (break_status & 0x1f) {
/* we have halted on a breakpoint */
retval = target_write_u32(target,
ejtag_info->ejtag_dbs_addr, 0);
if (retval != ERROR_OK)
return retval;
target->debug_reason = DBG_REASON_WATCHPOINT;
}
}
}
return ERROR_OK;
}
static int mips_m4k_debug_entry(struct target *target)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
mips32_save_context(target);
/* make sure stepping disabled, SSt bit in CP0 debug register cleared */
mips_ejtag_config_step(ejtag_info, 0);
/* make sure break unit configured */
mips32_configure_break_unit(target);
/* attempt to find halt reason */
mips_m4k_examine_debug_reason(target);
mips32_read_config_regs(target);
/* default to mips32 isa, it will be changed below if required */
mips32->isa_mode = MIPS32_ISA_MIPS32;
/* other than mips32 only and isa bit set ? */
if (mips32->isa_imp && buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1))
mips32->isa_mode = mips32->isa_imp == 2 ? MIPS32_ISA_MIPS16E : MIPS32_ISA_MMIPS32;
LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32),
target_state_name(target));
return ERROR_OK;
}
static struct target *get_mips_m4k(struct target *target, int32_t coreid)
{
struct target_list *head;
foreach_smp_target(head, target->smp_targets) {
struct target *curr = head->target;
if ((curr->coreid == coreid) && (curr->state == TARGET_HALTED))
return curr;
}
return target;
}
static int mips_m4k_halt_smp(struct target *target)
{
int retval = ERROR_OK;
struct target_list *head;
foreach_smp_target(head, target->smp_targets) {
int ret = ERROR_OK;
struct target *curr = head->target;
if ((curr != target) && (curr->state != TARGET_HALTED))
ret = mips_m4k_halt(curr);
if (ret != ERROR_OK) {
LOG_ERROR("halt failed target->coreid: %" PRId32, curr->coreid);
retval = ret;
}
}
return retval;
}
static int update_halt_gdb(struct target *target)
{
int retval = ERROR_OK;
if (target->gdb_service->core[0] == -1) {
target->gdb_service->target = target;
target->gdb_service->core[0] = target->coreid;
retval = mips_m4k_halt_smp(target);
}
return retval;
}
static int mips_m4k_poll(struct target *target)
{
int retval = ERROR_OK;
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl;
enum target_state prev_target_state = target->state;
/* toggle to another core is done by gdb as follow */
/* maint packet J core_id */
/* continue */
/* the next polling trigger an halt event sent to gdb */
if ((target->state == TARGET_HALTED) && (target->smp) &&
(target->gdb_service) &&
(!target->gdb_service->target)) {
target->gdb_service->target =
get_mips_m4k(target, target->gdb_service->core[1]);
target_call_event_callbacks(target, TARGET_EVENT_HALTED);
return retval;
}
/* read ejtag control reg */
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
if (retval != ERROR_OK)
return retval;
ejtag_info->isa = (ejtag_ctrl & EJTAG_CTRL_DBGISA) ? 1 : 0;
/* clear this bit before handling polling
* as after reset registers will read zero */
if (ejtag_ctrl & EJTAG_CTRL_ROCC) {
/* we have detected a reset, clear flag
* otherwise ejtag will not work */
ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
retval = mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
if (retval != ERROR_OK)
return retval;
LOG_DEBUG("Reset Detected");
}
/* check for processor halted */
if (ejtag_ctrl & EJTAG_CTRL_BRKST) {
if ((target->state != TARGET_HALTED)
&& (target->state != TARGET_DEBUG_RUNNING)) {
if (target->state == TARGET_UNKNOWN)
LOG_DEBUG("EJTAG_CTRL_BRKST already set during server startup.");
/* OpenOCD was was probably started on the board with EJTAG_CTRL_BRKST already set
* (maybe put on by HALT-ing the board in the previous session).
*
* Force enable debug entry for this session.
*/
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
target->state = TARGET_HALTED;
retval = mips_m4k_debug_entry(target);
if (retval != ERROR_OK)
return retval;
if (target->smp &&
((prev_target_state == TARGET_RUNNING)
|| (prev_target_state == TARGET_RESET))) {
retval = update_halt_gdb(target);
if (retval != ERROR_OK)
return retval;
}
target_call_event_callbacks(target, TARGET_EVENT_HALTED);
} else if (target->state == TARGET_DEBUG_RUNNING) {
target->state = TARGET_HALTED;
retval = mips_m4k_debug_entry(target);
if (retval != ERROR_OK)
return retval;
if (target->smp) {
retval = update_halt_gdb(target);
if (retval != ERROR_OK)
return retval;
}
target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
}
} else
target->state = TARGET_RUNNING;
/* LOG_DEBUG("ctrl = 0x%08X", ejtag_ctrl); */
return ERROR_OK;
}
static int mips_m4k_halt(struct target *target)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
LOG_DEBUG("target->state: %s", target_state_name(target));
if (target->state == TARGET_HALTED) {
LOG_DEBUG("target was already halted");
return ERROR_OK;
}
if (target->state == TARGET_UNKNOWN)
LOG_WARNING("target was in unknown state when halt was requested");
if (target->state == TARGET_RESET) {
if ((jtag_get_reset_config() & RESET_SRST_PULLS_TRST) && jtag_get_srst()) {
LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
return ERROR_TARGET_FAILURE;
} else {
/* we came here in a reset_halt or reset_init sequence
* debug entry was already prepared in mips_m4k_assert_reset()
*/
target->debug_reason = DBG_REASON_DBGRQ;
return ERROR_OK;
}
}
/* break processor */
mips_ejtag_enter_debug(ejtag_info);
target->debug_reason = DBG_REASON_DBGRQ;
return ERROR_OK;
}
static int mips_m4k_assert_reset(struct target *target)
{
struct mips_m4k_common *mips_m4k = target_to_m4k(target);
struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
/* TODO: apply hw reset signal in not examined state */
if (!(target_was_examined(target))) {
LOG_WARNING("Reset is not asserted because the target is not examined.");
LOG_WARNING("Use a reset button or power cycle the target.");
return ERROR_TARGET_NOT_EXAMINED;
}
LOG_DEBUG("target->state: %s",
target_state_name(target));
enum reset_types jtag_reset_config = jtag_get_reset_config();
/* some cores support connecting while srst is asserted
* use that mode is it has been configured */
bool srst_asserted = false;
if (!(jtag_reset_config & RESET_SRST_PULLS_TRST) &&
(jtag_reset_config & RESET_SRST_NO_GATING)) {
jtag_add_reset(0, 1);
srst_asserted = true;
}
/* EJTAG before v2.5/2.6 does not support EJTAGBOOT or NORMALBOOT */
if (ejtag_info->ejtag_version != EJTAG_VERSION_20) {
if (target->reset_halt) {
/* use hardware to catch reset */
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT);
} else
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT);
}
if (jtag_reset_config & RESET_HAS_SRST) {
/* here we should issue a srst only, but we may have to assert trst as well */
if (jtag_reset_config & RESET_SRST_PULLS_TRST)
jtag_add_reset(1, 1);
else if (!srst_asserted)
jtag_add_reset(0, 1);
} else if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
} else {
if (mips_m4k->is_pic32mx) {
LOG_DEBUG("Using MTAP reset to reset processor...");
/* use microchip specific MTAP reset */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP);
mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND);
mips_ejtag_drscan_8_out(ejtag_info, MCHP_ASERT_RST);
mips_ejtag_drscan_8_out(ejtag_info, MCHP_DE_ASSERT_RST);
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
} else {
/* use ejtag reset - not supported by all cores */
uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
mips_ejtag_drscan_32_out(ejtag_info, ejtag_ctrl);
}
}
target->state = TARGET_RESET;
jtag_add_sleep(50000);
register_cache_invalidate(mips_m4k->mips32.core_cache);
if (target->reset_halt) {
int retval = target_halt(target);
if (retval != ERROR_OK)
return retval;
}
return ERROR_OK;
}
static int mips_m4k_deassert_reset(struct target *target)
{
LOG_DEBUG("target->state: %s", target_state_name(target));
/* deassert reset lines */
jtag_add_reset(0, 0);
return ERROR_OK;
}
static int mips_m4k_single_step_core(struct target *target)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
/* configure single step mode */
mips_ejtag_config_step(ejtag_info, 1);
/* disable interrupts while stepping */
mips32_enable_interrupts(target, 0);
/* exit debug mode */
mips_ejtag_exit_debug(ejtag_info);
mips_m4k_debug_entry(target);
return ERROR_OK;
}
static int mips_m4k_restore_smp(struct target *target, uint32_t address, int handle_breakpoints)
{
int retval = ERROR_OK;
struct target_list *head;
foreach_smp_target(head, target->smp_targets) {
int ret = ERROR_OK;
struct target *curr = head->target;
if ((curr != target) && (curr->state != TARGET_RUNNING)) {
/* resume current address , not in step mode */
ret = mips_m4k_internal_restore(curr, 1, address,
handle_breakpoints, 0);
if (ret != ERROR_OK) {
LOG_ERROR("target->coreid :%" PRId32 " failed to resume at address :0x%" PRIx32,
curr->coreid, address);
retval = ret;
}
}
}
return retval;
}
static int mips_m4k_internal_restore(struct target *target, int current,
target_addr_t address, int handle_breakpoints, int debug_execution)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct breakpoint *breakpoint = NULL;
uint32_t resume_pc;
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (!debug_execution) {
target_free_all_working_areas(target);
mips_m4k_enable_breakpoints(target);
mips_m4k_enable_watchpoints(target);
}
/* current = 1: continue on current pc, otherwise continue at <address> */
if (!current) {
mips_m4k_isa_filter(mips32->isa_imp, &address);
buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
mips32->core_cache->reg_list[MIPS32_PC].dirty = true;
mips32->core_cache->reg_list[MIPS32_PC].valid = true;
}
if ((mips32->isa_imp > 1) && debug_execution) /* if more than one isa supported */
buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 1, mips32->isa_mode);
if (!current)
resume_pc = address;
else
resume_pc = buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32);
mips32_restore_context(target);
/* the front-end may request us not to handle breakpoints */
if (handle_breakpoints) {
/* Single step past breakpoint at current address */
breakpoint = breakpoint_find(target, resume_pc);
if (breakpoint) {
LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT "",
breakpoint->address);
mips_m4k_unset_breakpoint(target, breakpoint);
mips_m4k_single_step_core(target);
mips_m4k_set_breakpoint(target, breakpoint);
}
}
/* enable interrupts if we are running */
mips32_enable_interrupts(target, !debug_execution);
/* exit debug mode */
mips_ejtag_exit_debug(ejtag_info);
target->debug_reason = DBG_REASON_NOTHALTED;
/* registers are now invalid */
register_cache_invalidate(mips32->core_cache);
if (!debug_execution) {
target->state = TARGET_RUNNING;
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
} else {
target->state = TARGET_DEBUG_RUNNING;
target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
}
return ERROR_OK;
}
static int mips_m4k_resume(struct target *target, int current,
target_addr_t address, int handle_breakpoints, int debug_execution)
{
int retval = ERROR_OK;
/* dummy resume for smp toggle in order to reduce gdb impact */
if ((target->smp) && (target->gdb_service->core[1] != -1)) {
/* simulate a start and halt of target */
target->gdb_service->target = NULL;
target->gdb_service->core[0] = target->gdb_service->core[1];
/* fake resume at next poll we play the target core[1], see poll*/
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
return retval;
}
retval = mips_m4k_internal_restore(target, current, address,
handle_breakpoints,
debug_execution);
if (retval == ERROR_OK && target->smp) {
target->gdb_service->core[0] = -1;
retval = mips_m4k_restore_smp(target, address, handle_breakpoints);
}
return retval;
}
static int mips_m4k_step(struct target *target, int current,
target_addr_t address, int handle_breakpoints)
{
/* get pointers to arch-specific information */
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct breakpoint *breakpoint = NULL;
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* current = 1: continue on current pc, otherwise continue at <address> */
if (!current) {
mips_m4k_isa_filter(mips32->isa_imp, &address);
buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
mips32->core_cache->reg_list[MIPS32_PC].dirty = true;
mips32->core_cache->reg_list[MIPS32_PC].valid = true;
}
/* the front-end may request us not to handle breakpoints */
if (handle_breakpoints) {
breakpoint = breakpoint_find(target,
buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
if (breakpoint)
mips_m4k_unset_breakpoint(target, breakpoint);
}
/* restore context */
mips32_restore_context(target);
/* configure single step mode */
mips_ejtag_config_step(ejtag_info, 1);
target->debug_reason = DBG_REASON_SINGLESTEP;
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
/* disable interrupts while stepping */
mips32_enable_interrupts(target, 0);
/* exit debug mode */
mips_ejtag_exit_debug(ejtag_info);
/* registers are now invalid */
register_cache_invalidate(mips32->core_cache);
LOG_DEBUG("target stepped ");
mips_m4k_debug_entry(target);
if (breakpoint)
mips_m4k_set_breakpoint(target, breakpoint);
target_call_event_callbacks(target, TARGET_EVENT_HALTED);
return ERROR_OK;
}
static void mips_m4k_enable_breakpoints(struct target *target)
{
struct breakpoint *breakpoint = target->breakpoints;
/* set any pending breakpoints */
while (breakpoint) {
if (!breakpoint->is_set)
mips_m4k_set_breakpoint(target, breakpoint);
breakpoint = breakpoint->next;
}
}
static int mips_m4k_set_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct mips32_comparator *comparator_list = mips32->inst_break_list;
int retval;
if (breakpoint->is_set) {
LOG_WARNING("breakpoint already set");
return ERROR_OK;
}
if (breakpoint->type == BKPT_HARD) {
int bp_num = 0;
while (comparator_list[bp_num].used && (bp_num < mips32->num_inst_bpoints))
bp_num++;
if (bp_num >= mips32->num_inst_bpoints) {
LOG_ERROR("Can not find free FP Comparator(bpid: %" PRIu32 ")",
breakpoint->unique_id);
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
breakpoint_hw_set(breakpoint, bp_num);
comparator_list[bp_num].used = 1;
comparator_list[bp_num].bp_value = breakpoint->address;
if (breakpoint->length != 4) /* make sure isa bit set */
comparator_list[bp_num].bp_value |= 1;
else /* make sure isa bit cleared */
comparator_list[bp_num].bp_value &= ~1;
/* EJTAG 2.0 uses 30bit IBA. First 2 bits are reserved.
* Warning: there is no IB ASID registers in 2.0.
* Do not set it! :) */
if (ejtag_info->ejtag_version == EJTAG_VERSION_20)
comparator_list[bp_num].bp_value &= 0xFFFFFFFC;
target_write_u32(target, comparator_list[bp_num].reg_address,
comparator_list[bp_num].bp_value);
target_write_u32(target, comparator_list[bp_num].reg_address +
ejtag_info->ejtag_ibm_offs, 0x00000000);
target_write_u32(target, comparator_list[bp_num].reg_address +
ejtag_info->ejtag_ibc_offs, 1);
LOG_DEBUG("bpid: %" PRIu32 ", bp_num %i bp_value 0x%" PRIx32 "",
breakpoint->unique_id,
bp_num, comparator_list[bp_num].bp_value);
} else if (breakpoint->type == BKPT_SOFT) {
LOG_DEBUG("bpid: %" PRIu32, breakpoint->unique_id);
uint32_t isa_req = breakpoint->length & 1; /* micro mips request bit */
uint32_t bplength = breakpoint->length & ~1; /* drop micro mips request bit for length */
uint32_t bpaddr = breakpoint->address & ~1; /* drop isa bit from address, if set */
if (bplength == 4) {
uint32_t verify = 0xffffffff;
uint32_t sdbbp32_instr = MIPS32_SDBBP(isa_req);
if (ejtag_info->endianness && isa_req)
sdbbp32_instr = SWAP16(sdbbp32_instr);
if ((breakpoint->address & 3) == 0) { /* word aligned */
retval = target_read_memory(target, bpaddr, bplength, 1, breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
retval = target_write_u32(target, bpaddr, sdbbp32_instr);
if (retval != ERROR_OK)
return retval;
retval = target_read_u32(target, bpaddr, &verify);
if (retval != ERROR_OK)
return retval;
if (verify != sdbbp32_instr)
verify = 0;
} else { /* 16 bit aligned */
retval = target_read_memory(target, bpaddr, 2, 2, breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
uint8_t sdbbp_buf[4];
target_buffer_set_u32(target, sdbbp_buf, sdbbp32_instr);
retval = target_write_memory(target, bpaddr, 2, 2, sdbbp_buf);
if (retval != ERROR_OK)
return retval;
retval = target_read_memory(target, bpaddr, 2, 2, sdbbp_buf);
if (retval != ERROR_OK)
return retval;
if (target_buffer_get_u32(target, sdbbp_buf) != sdbbp32_instr)
verify = 0;
}
if (verify == 0) {
LOG_ERROR("Unable to set 32bit breakpoint at address %08" TARGET_PRIxADDR
" - check that memory is read/writable", breakpoint->address);
return ERROR_OK;
}
} else {
uint16_t verify = 0xffff;
retval = target_read_memory(target, bpaddr, bplength, 1, breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
retval = target_write_u16(target, bpaddr, MIPS16_SDBBP(isa_req));
if (retval != ERROR_OK)
return retval;
retval = target_read_u16(target, bpaddr, &verify);
if (retval != ERROR_OK)
return retval;
if (verify != MIPS16_SDBBP(isa_req)) {
LOG_ERROR("Unable to set 16bit breakpoint at address %08" TARGET_PRIxADDR
" - check that memory is read/writable", breakpoint->address);
return ERROR_OK;
}
}
breakpoint->is_set = true;
}
return ERROR_OK;
}
static int mips_m4k_unset_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
/* get pointers to arch-specific information */
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct mips32_comparator *comparator_list = mips32->inst_break_list;
int retval;
if (!breakpoint->is_set) {
LOG_WARNING("breakpoint not set");
return ERROR_OK;
}
if (breakpoint->type == BKPT_HARD) {
int bp_num = breakpoint->number;
if (bp_num >= mips32->num_inst_bpoints) {
LOG_DEBUG("Invalid FP Comparator number in breakpoint (bpid: %" PRIu32 ")",
breakpoint->unique_id);
return ERROR_OK;
}
LOG_DEBUG("bpid: %" PRIu32 " - releasing hw: %d",
breakpoint->unique_id,
bp_num);
comparator_list[bp_num].used = 0;
comparator_list[bp_num].bp_value = 0;
target_write_u32(target, comparator_list[bp_num].reg_address +
ejtag_info->ejtag_ibc_offs, 0);
} else {
/* restore original instruction (kept in target endianness) */
uint32_t isa_req = breakpoint->length & 1;
uint32_t bplength = breakpoint->length & ~1;
uint8_t current_instr[4];
LOG_DEBUG("bpid: %" PRIu32, breakpoint->unique_id);
if (bplength == 4) {
uint32_t sdbbp32_instr = MIPS32_SDBBP(isa_req);
if (ejtag_info->endianness && isa_req)
sdbbp32_instr = SWAP16(sdbbp32_instr);
if ((breakpoint->address & 3) == 0) { /* 32bit aligned */
/* check that user program has not modified breakpoint instruction */
retval = target_read_memory(target, breakpoint->address, 4, 1, current_instr);
if (retval != ERROR_OK)
return retval;
/**
* target_read_memory() gets us data in _target_ endianness.
* If we want to use this data on the host for comparisons with some macros
* we must first transform it to _host_ endianness using target_buffer_get_u16().
*/
if (sdbbp32_instr == target_buffer_get_u32(target, current_instr)) {
retval = target_write_memory(target, breakpoint->address, 4, 1,
breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
}
} else { /* 16bit aligned */
retval = target_read_memory(target, breakpoint->address, 2, 2, current_instr);
if (retval != ERROR_OK)
return retval;
if (sdbbp32_instr == target_buffer_get_u32(target, current_instr)) {
retval = target_write_memory(target, breakpoint->address, 2, 2,
breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
}
}
} else {
/* check that user program has not modified breakpoint instruction */
retval = target_read_memory(target, breakpoint->address, 2, 1, current_instr);
if (retval != ERROR_OK)
return retval;
if (target_buffer_get_u16(target, current_instr) == MIPS16_SDBBP(isa_req)) {
retval = target_write_memory(target, breakpoint->address, 2, 1,
breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
}
}
}
breakpoint->is_set = false;
return ERROR_OK;
}
static int mips_m4k_add_breakpoint(struct target *target, struct breakpoint *breakpoint)
{
struct mips32_common *mips32 = target_to_mips32(target);
if ((breakpoint->length > 5 || breakpoint->length < 2) || /* out of range */
(breakpoint->length == 4 && (breakpoint->address & 2)) || /* mips32 unaligned */
(mips32->isa_imp == MIPS32_ONLY && breakpoint->length != 4) || /* misp32 specific */
((mips32->isa_imp & 1) != (breakpoint->length & 1))) /* isa not implemented */
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
if (breakpoint->type == BKPT_HARD) {
if (mips32->num_inst_bpoints_avail < 1) {
LOG_INFO("no hardware breakpoint available");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
mips32->num_inst_bpoints_avail--;
}
return mips_m4k_set_breakpoint(target, breakpoint);
}
static int mips_m4k_remove_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
/* get pointers to arch-specific information */
struct mips32_common *mips32 = target_to_mips32(target);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (breakpoint->is_set)
mips_m4k_unset_breakpoint(target, breakpoint);
if (breakpoint->type == BKPT_HARD)
mips32->num_inst_bpoints_avail++;
return ERROR_OK;
}
static int mips_m4k_set_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct mips32_comparator *comparator_list = mips32->data_break_list;
int wp_num = 0;
/*
* watchpoint enabled, ignore all byte lanes in value register
* and exclude both load and store accesses from watchpoint
* condition evaluation
*/
int enable = EJTAG_DBCN_NOSB | EJTAG_DBCN_NOLB | EJTAG_DBCN_BE |
(0xff << EJTAG_DBCN_BLM_SHIFT);
if (watchpoint->is_set) {
LOG_WARNING("watchpoint already set");
return ERROR_OK;
}
while (comparator_list[wp_num].used && (wp_num < mips32->num_data_bpoints))
wp_num++;
if (wp_num >= mips32->num_data_bpoints) {
LOG_ERROR("Can not find free FP Comparator");
return ERROR_FAIL;
}
if (watchpoint->length != 4) {
LOG_ERROR("Only watchpoints of length 4 are supported");
return ERROR_TARGET_UNALIGNED_ACCESS;
}
if (watchpoint->address % 4) {
LOG_ERROR("Watchpoints address should be word aligned");
return ERROR_TARGET_UNALIGNED_ACCESS;
}
switch (watchpoint->rw) {
case WPT_READ:
enable &= ~EJTAG_DBCN_NOLB;
break;
case WPT_WRITE:
enable &= ~EJTAG_DBCN_NOSB;
break;
case WPT_ACCESS:
enable &= ~(EJTAG_DBCN_NOLB | EJTAG_DBCN_NOSB);
break;
default:
LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
}
watchpoint->number = wp_num;
comparator_list[wp_num].used = 1;
comparator_list[wp_num].bp_value = watchpoint->address;
/* EJTAG 2.0 uses 29bit DBA. First 3 bits are reserved.
* There is as well no ASID register support. */
if (ejtag_info->ejtag_version == EJTAG_VERSION_20)
comparator_list[wp_num].bp_value &= 0xFFFFFFF8;
else
target_write_u32(target, comparator_list[wp_num].reg_address +
ejtag_info->ejtag_dbasid_offs, 0x00000000);
target_write_u32(target, comparator_list[wp_num].reg_address,
comparator_list[wp_num].bp_value);
target_write_u32(target, comparator_list[wp_num].reg_address +
ejtag_info->ejtag_dbm_offs, 0x00000000);
target_write_u32(target, comparator_list[wp_num].reg_address +
ejtag_info->ejtag_dbc_offs, enable);
/* TODO: probably this value is ignored on 2.0 */
target_write_u32(target, comparator_list[wp_num].reg_address +
ejtag_info->ejtag_dbv_offs, 0);
LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "", wp_num, comparator_list[wp_num].bp_value);
return ERROR_OK;
}
static int mips_m4k_unset_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
/* get pointers to arch-specific information */
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct mips32_comparator *comparator_list = mips32->data_break_list;
if (!watchpoint->is_set) {
LOG_WARNING("watchpoint not set");
return ERROR_OK;
}
int wp_num = watchpoint->number;
if (wp_num >= mips32->num_data_bpoints) {
LOG_DEBUG("Invalid FP Comparator number in watchpoint");
return ERROR_OK;
}
comparator_list[wp_num].used = 0;
comparator_list[wp_num].bp_value = 0;
target_write_u32(target, comparator_list[wp_num].reg_address +
ejtag_info->ejtag_dbc_offs, 0);
watchpoint->is_set = false;
return ERROR_OK;
}
static int mips_m4k_add_watchpoint(struct target *target, struct watchpoint *watchpoint)
{
struct mips32_common *mips32 = target_to_mips32(target);
if (mips32->num_data_bpoints_avail < 1) {
LOG_INFO("no hardware watchpoints available");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
mips32->num_data_bpoints_avail--;
mips_m4k_set_watchpoint(target, watchpoint);
return ERROR_OK;
}
static int mips_m4k_remove_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
/* get pointers to arch-specific information */
struct mips32_common *mips32 = target_to_mips32(target);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (watchpoint->is_set)
mips_m4k_unset_watchpoint(target, watchpoint);
mips32->num_data_bpoints_avail++;
return ERROR_OK;
}
static void mips_m4k_enable_watchpoints(struct target *target)
{
struct watchpoint *watchpoint = target->watchpoints;
/* set any pending watchpoints */
while (watchpoint) {
if (!watchpoint->is_set)
mips_m4k_set_watchpoint(target, watchpoint);
watchpoint = watchpoint->next;
}
}
static int mips_m4k_read_memory(struct target *target, target_addr_t address,
uint32_t size, uint32_t count, uint8_t *buffer)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
LOG_DEBUG("address: " TARGET_ADDR_FMT ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
address, size, count);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* sanitize arguments */
if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
return ERROR_COMMAND_SYNTAX_ERROR;
if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
return ERROR_TARGET_UNALIGNED_ACCESS;
/* since we don't know if buffer is aligned, we allocate new mem that is always aligned */
void *t = NULL;
if (size > 1) {
t = malloc(count * size * sizeof(uint8_t));
if (!t) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
} else
t = buffer;
/* if noDMA off, use DMAACC mode for memory read */
int retval;
if (ejtag_info->impcode & EJTAG_IMP_NODMA)
retval = mips32_pracc_read_mem(ejtag_info, address, size, count, t);
else
retval = mips32_dmaacc_read_mem(ejtag_info, address, size, count, t);
/* mips32_..._read_mem with size 4/2 returns uint32_t/uint16_t in host */
/* endianness, but byte array should represent target endianness */
if (retval == ERROR_OK) {
switch (size) {
case 4:
target_buffer_set_u32_array(target, buffer, count, t);
break;
case 2:
target_buffer_set_u16_array(target, buffer, count, t);
break;
}
}
if (size > 1)
free(t);
return retval;
}
static int mips_m4k_write_memory(struct target *target, target_addr_t address,
uint32_t size, uint32_t count, const uint8_t *buffer)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
LOG_DEBUG("address: " TARGET_ADDR_FMT ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32 "",
address, size, count);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (size == 4 && count > 32) {
int retval = mips_m4k_bulk_write_memory(target, address, count, buffer);
if (retval == ERROR_OK)
return ERROR_OK;
LOG_WARNING("Falling back to non-bulk write");
}
/* sanitize arguments */
if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
return ERROR_COMMAND_SYNTAX_ERROR;
if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
return ERROR_TARGET_UNALIGNED_ACCESS;
/** correct endianness if we have word or hword access */
void *t = NULL;
if (size > 1) {
/* mips32_..._write_mem with size 4/2 requires uint32_t/uint16_t in host */
/* endianness, but byte array represents target endianness */
t = malloc(count * size * sizeof(uint8_t));
if (!t) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
switch (size) {
case 4:
target_buffer_get_u32_array(target, buffer, count, (uint32_t *)t);
break;
case 2:
target_buffer_get_u16_array(target, buffer, count, (uint16_t *)t);
break;
}
buffer = t;
}
/* if noDMA off, use DMAACC mode for memory write */
int retval;
if (ejtag_info->impcode & EJTAG_IMP_NODMA)
retval = mips32_pracc_write_mem(ejtag_info, address, size, count, buffer);
else
retval = mips32_dmaacc_write_mem(ejtag_info, address, size, count, buffer);
free(t);
if (retval != ERROR_OK)
return retval;
return ERROR_OK;
}
static int mips_m4k_init_target(struct command_context *cmd_ctx,
struct target *target)
{
mips32_build_reg_cache(target);
return ERROR_OK;
}
static int mips_m4k_init_arch_info(struct target *target,
struct mips_m4k_common *mips_m4k, struct jtag_tap *tap)
{
struct mips32_common *mips32 = &mips_m4k->mips32;
mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
/* initialize mips4k specific info */
mips32_init_arch_info(target, mips32, tap);
mips32->arch_info = mips_m4k;
return ERROR_OK;
}
static int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
{
struct mips_m4k_common *mips_m4k = calloc(1, sizeof(struct mips_m4k_common));
mips_m4k_init_arch_info(target, mips_m4k, target->tap);
return ERROR_OK;
}
static int mips_m4k_examine(struct target *target)
{
struct mips_m4k_common *mips_m4k = target_to_m4k(target);
struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
if (!target_was_examined(target)) {
int retval = mips_ejtag_get_idcode(ejtag_info);
if (retval != ERROR_OK) {
LOG_ERROR("idcode read failed");
return retval;
}
if (((ejtag_info->idcode >> 1) & 0x7FF) == 0x29) {
/* we are using a pic32mx so select ejtag port
* as it is not selected by default */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP);
LOG_DEBUG("PIC32 Detected - using EJTAG Interface");
mips_m4k->is_pic32mx = true;
}
}
/* init rest of ejtag interface */
int retval = mips_ejtag_init(ejtag_info);
if (retval != ERROR_OK)
return retval;
return mips32_examine(target);
}
static int mips_m4k_bulk_write_memory(struct target *target, target_addr_t address,
uint32_t count, const uint8_t *buffer)
{
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct working_area *fast_data_area;
int retval;
int write_t = 1;
LOG_DEBUG("address: " TARGET_ADDR_FMT ", count: 0x%8.8" PRIx32 "",
address, count);
/* check alignment */
if (address & 0x3u)
return ERROR_TARGET_UNALIGNED_ACCESS;
if (!mips32->fast_data_area) {
/* Get memory for block write handler
* we preserve this area between calls and gain a speed increase
* of about 3kb/sec when writing flash
* this will be released/nulled by the system when the target is resumed or reset */
retval = target_alloc_working_area(target,
MIPS32_FASTDATA_HANDLER_SIZE,
&mips32->fast_data_area);
if (retval != ERROR_OK) {
LOG_ERROR("No working area available");
return retval;
}
/* reset fastadata state so the algo get reloaded */
ejtag_info->fast_access_save = -1;
}
fast_data_area = mips32->fast_data_area;
if (address <= fast_data_area->address + fast_data_area->size &&
fast_data_area->address <= address + count) {
LOG_ERROR("fast_data (" TARGET_ADDR_FMT ") is within write area "
"(" TARGET_ADDR_FMT "-" TARGET_ADDR_FMT ").",
fast_data_area->address, address, address + count);
LOG_ERROR("Change work-area-phys or load_image address!");
return ERROR_FAIL;
}
/* mips32_pracc_fastdata_xfer requires uint32_t in host endianness, */
/* but byte array represents target endianness */
uint32_t *t = NULL;
t = malloc(count * sizeof(uint32_t));
if (!t) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
target_buffer_get_u32_array(target, buffer, count, t);
retval = mips32_pracc_fastdata_xfer(ejtag_info, mips32->fast_data_area, write_t, address,
count, t);
free(t);
if (retval != ERROR_OK)
LOG_ERROR("Fastdata access Failed");
return retval;
}
static int mips_m4k_verify_pointer(struct command_invocation *cmd,
struct mips_m4k_common *mips_m4k)
{
if (mips_m4k->common_magic != MIPSM4K_COMMON_MAGIC) {
command_print(cmd, "target is not an MIPS_M4K");
return ERROR_TARGET_INVALID;
}
return ERROR_OK;
}
COMMAND_HANDLER(mips_m4k_handle_cp0_command)
{
int retval;
struct target *target = get_current_target(CMD_CTX);
struct mips_m4k_common *mips_m4k = target_to_m4k(target);
struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
retval = mips_m4k_verify_pointer(CMD, mips_m4k);
if (retval != ERROR_OK)
return retval;
if (target->state != TARGET_HALTED) {
command_print(CMD, "target must be stopped for \"%s\" command", CMD_NAME);
return ERROR_OK;
}
/* two or more argument, access a single register/select (write if third argument is given) */
if (CMD_ARGC < 2)
return ERROR_COMMAND_SYNTAX_ERROR;
else {
uint32_t cp0_reg, cp0_sel;
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
if (CMD_ARGC == 2) {
uint32_t value;
retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel);
if (retval != ERROR_OK) {
command_print(CMD,
"couldn't access reg %" PRIu32,
cp0_reg);
return ERROR_OK;
}
command_print(CMD, "cp0 reg %" PRIu32 ", select %" PRIu32 ": %8.8" PRIx32,
cp0_reg, cp0_sel, value);
} else if (CMD_ARGC == 3) {
uint32_t value;
COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel);
if (retval != ERROR_OK) {
command_print(CMD,
"couldn't access cp0 reg %" PRIu32 ", select %" PRIu32,
cp0_reg, cp0_sel);
return ERROR_OK;
}
command_print(CMD, "cp0 reg %" PRIu32 ", select %" PRIu32 ": %8.8" PRIx32,
cp0_reg, cp0_sel, value);
}
}
return ERROR_OK;
}
COMMAND_HANDLER(mips_m4k_handle_scan_delay_command)
{
struct target *target = get_current_target(CMD_CTX);
struct mips_m4k_common *mips_m4k = target_to_m4k(target);
struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
if (CMD_ARGC == 1)
COMMAND_PARSE_NUMBER(uint, CMD_ARGV[0], ejtag_info->scan_delay);
else if (CMD_ARGC > 1)
return ERROR_COMMAND_SYNTAX_ERROR;
command_print(CMD, "scan delay: %d nsec", ejtag_info->scan_delay);
if (ejtag_info->scan_delay >= MIPS32_SCAN_DELAY_LEGACY_MODE) {
ejtag_info->mode = 0;
command_print(CMD, "running in legacy mode");
} else {
ejtag_info->mode = 1;
command_print(CMD, "running in fast queued mode");
}
return ERROR_OK;
}
static const struct command_registration mips_m4k_exec_command_handlers[] = {
{
.name = "cp0",
.handler = mips_m4k_handle_cp0_command,
.mode = COMMAND_EXEC,
.usage = "regnum [value]",
.help = "display/modify cp0 register",
},
{
.name = "scan_delay",
.handler = mips_m4k_handle_scan_delay_command,
.mode = COMMAND_ANY,
.help = "display/set scan delay in nano seconds",
.usage = "[value]",
},
{
.chain = smp_command_handlers,
},
COMMAND_REGISTRATION_DONE
};
const struct command_registration mips_m4k_command_handlers[] = {
{
.chain = mips32_command_handlers,
},
{
.name = "mips_m4k",
.mode = COMMAND_ANY,
.help = "mips_m4k command group",
.usage = "",
.chain = mips_m4k_exec_command_handlers,
},
COMMAND_REGISTRATION_DONE
};
struct target_type mips_m4k_target = {
.name = "mips_m4k",
.poll = mips_m4k_poll,
.arch_state = mips32_arch_state,
.halt = mips_m4k_halt,
.resume = mips_m4k_resume,
.step = mips_m4k_step,
.assert_reset = mips_m4k_assert_reset,
.deassert_reset = mips_m4k_deassert_reset,
.get_gdb_reg_list = mips32_get_gdb_reg_list,
.read_memory = mips_m4k_read_memory,
.write_memory = mips_m4k_write_memory,
.checksum_memory = mips32_checksum_memory,
.blank_check_memory = mips32_blank_check_memory,
.run_algorithm = mips32_run_algorithm,
.add_breakpoint = mips_m4k_add_breakpoint,
.remove_breakpoint = mips_m4k_remove_breakpoint,
.add_watchpoint = mips_m4k_add_watchpoint,
.remove_watchpoint = mips_m4k_remove_watchpoint,
.commands = mips_m4k_command_handlers,
.target_create = mips_m4k_target_create,
.init_target = mips_m4k_init_target,
.examine = mips_m4k_examine,
};
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