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openocd/src/target/arm7tdmi.c

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/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.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, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "arm7tdmi.h"
#include "target_type.h"
#if 0
#define _DEBUG_INSTRUCTION_EXECUTION_
#endif
/* forward declarations */
int arm7tdmi_target_create(struct target_s *target,Jim_Interp *interp);
int arm7tdmi_quit(void);
/* target function declarations */
int arm7tdmi_poll(struct target_s *target);
int arm7tdmi_halt(target_t *target);
target_type_t arm7tdmi_target =
{
.name = "arm7tdmi",
.poll = arm7_9_poll,
.arch_state = armv4_5_arch_state,
.target_request_data = arm7_9_target_request_data,
.halt = arm7_9_halt,
.resume = arm7_9_resume,
.step = arm7_9_step,
.assert_reset = arm7_9_assert_reset,
.deassert_reset = arm7_9_deassert_reset,
.soft_reset_halt = arm7_9_soft_reset_halt,
.get_gdb_reg_list = armv4_5_get_gdb_reg_list,
.read_memory = arm7_9_read_memory,
.write_memory = arm7_9_write_memory,
.bulk_write_memory = arm7_9_bulk_write_memory,
.checksum_memory = arm7_9_checksum_memory,
.blank_check_memory = arm7_9_blank_check_memory,
.run_algorithm = armv4_5_run_algorithm,
.add_breakpoint = arm7_9_add_breakpoint,
.remove_breakpoint = arm7_9_remove_breakpoint,
.add_watchpoint = arm7_9_add_watchpoint,
.remove_watchpoint = arm7_9_remove_watchpoint,
.register_commands = arm7tdmi_register_commands,
.target_create = arm7tdmi_target_create,
.init_target = arm7tdmi_init_target,
.examine = arm7tdmi_examine,
.quit = arm7tdmi_quit
};
int arm7tdmi_examine_debug_reason(target_t *target)
{
int retval = ERROR_OK;
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
/* only check the debug reason if we don't know it already */
if ((target->debug_reason != DBG_REASON_DBGRQ)
&& (target->debug_reason != DBG_REASON_SINGLESTEP))
{
scan_field_t fields[2];
uint8_t databus[4];
uint8_t breakpoint;
jtag_set_end_state(TAP_DRPAUSE);
fields[0].tap = arm7_9->jtag_info.tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
fields[0].in_value = &breakpoint;
fields[1].tap = arm7_9->jtag_info.tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
fields[1].in_value = databus;
if ((retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1)) != ERROR_OK)
{
return retval;
}
arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL);
jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
if ((retval = jtag_execute_queue()) != ERROR_OK)
{
return retval;
}
fields[0].in_value = NULL;
fields[0].out_value = &breakpoint;
fields[1].in_value = NULL;
fields[1].out_value = databus;
jtag_add_dr_scan(2, fields, jtag_set_end_state(TAP_DRPAUSE));
if (breakpoint & 1)
target->debug_reason = DBG_REASON_WATCHPOINT;
else
target->debug_reason = DBG_REASON_BREAKPOINT;
}
return ERROR_OK;
}
static int arm7tdmi_num_bits[]={1, 32};
static __inline int arm7tdmi_clock_out_inner(arm_jtag_t *jtag_info, uint32_t out, int breakpoint)
{
uint32_t values[2]={breakpoint, flip_u32(out, 32)};
jtag_add_dr_out(jtag_info->tap,
2,
arm7tdmi_num_bits,
values,
jtag_get_end_state());
jtag_add_runtest(0, jtag_get_end_state());
return ERROR_OK;
}
/* put an instruction in the ARM7TDMI pipeline or write the data bus, and optionally read data */
static __inline int arm7tdmi_clock_out(arm_jtag_t *jtag_info, uint32_t out, uint32_t *deprecated, int breakpoint)
{
jtag_set_end_state(TAP_DRPAUSE);
arm_jtag_scann(jtag_info, 0x1);
arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
}
/* clock the target, reading the databus */
int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, uint32_t *in)
{
int retval = ERROR_OK;
scan_field_t fields[2];
jtag_set_end_state(TAP_DRPAUSE);
if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
{
return retval;
}
arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
fields[0].tap = jtag_info->tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
fields[0].in_value = NULL;
fields[1].tap = jtag_info->tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
fields[1].in_value = (uint8_t *)in;
jtag_add_dr_scan(2, fields, jtag_get_end_state());
jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
jtag_add_runtest(0, jtag_get_end_state());
#ifdef _DEBUG_INSTRUCTION_EXECUTION_
{
if ((retval = jtag_execute_queue()) != ERROR_OK)
{
return retval;
}
if (in)
{
LOG_DEBUG("in: 0x%8.8x", *in);
}
else
{
LOG_ERROR("BUG: called with in == NULL");
}
}
#endif
return ERROR_OK;
}
void arm_endianness(uint8_t *tmp, void *in, int size, int be, int flip)
{
uint32_t readback = le_to_h_u32(tmp);
if (flip)
readback = flip_u32(readback, 32);
switch (size)
{
case 4:
if (be)
{
h_u32_to_be(((uint8_t*)in), readback);
} else
{
h_u32_to_le(((uint8_t*)in), readback);
}
break;
case 2:
if (be)
{
h_u16_to_be(((uint8_t*)in), readback & 0xffff);
} else
{
h_u16_to_le(((uint8_t*)in), readback & 0xffff);
}
break;
case 1:
*((uint8_t *)in)= readback & 0xff;
break;
}
}
static int arm7endianness(jtag_callback_data_t arg, jtag_callback_data_t size, jtag_callback_data_t be, jtag_callback_data_t captured)
{
uint8_t *in = (uint8_t *)arg;
arm_endianness((uint8_t *)captured, in, (int)size, (int)be, 1);
return ERROR_OK;
}
/* clock the target, and read the databus
* the *in pointer points to a buffer where elements of 'size' bytes
* are stored in big (be == 1) or little (be == 0) endianness
*/
int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size, int be)
{
int retval = ERROR_OK;
scan_field_t fields[2];
jtag_set_end_state(TAP_DRPAUSE);
if ((retval = arm_jtag_scann(jtag_info, 0x1)) != ERROR_OK)
{
return retval;
}
arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
fields[0].tap = jtag_info->tap;
fields[0].num_bits = 1;
fields[0].out_value = NULL;
fields[0].in_value = NULL;
fields[1].tap = jtag_info->tap;
fields[1].num_bits = 32;
fields[1].out_value = NULL;
jtag_alloc_in_value32(&fields[1]);
jtag_add_dr_scan(2, fields, jtag_get_end_state());
jtag_add_callback4(arm7endianness, (jtag_callback_data_t)in, (jtag_callback_data_t)size, (jtag_callback_data_t)be, (jtag_callback_data_t)fields[1].in_value);
jtag_add_runtest(0, jtag_get_end_state());
#ifdef _DEBUG_INSTRUCTION_EXECUTION_
{
if ((retval = jtag_execute_queue()) != ERROR_OK)
{
return retval;
}
if (in)
{
LOG_DEBUG("in: 0x%8.8x", *(uint32_t*)in);
}
else
{
LOG_ERROR("BUG: called with in == NULL");
}
}
#endif
return ERROR_OK;
}
void arm7tdmi_change_to_arm(target_t *target, uint32_t *r0, uint32_t *pc)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* save r0 before using it and put system in ARM state
* to allow common handling of ARM and THUMB debugging */
/* fetch STR r0, [r0] */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* nothing fetched, STR r0, [r0] in Execute (2) */
arm7tdmi_clock_data_in(jtag_info, r0);
/* MOV r0, r15 fetched, STR in Decode */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* nothing fetched, STR r0, [r0] in Execute (2) */
arm7tdmi_clock_data_in(jtag_info, pc);
/* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* nothing fetched, data for LDR r0, [PC, #0] */
arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
/* nothing fetched, data from previous cycle is written to register */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* fetch BX */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
/* NOP fetched, BX in Decode, MOV in Execute */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* NOP fetched, BX in Execute (1) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
jtag_execute_queue();
/* fix program counter:
* MOV r0, r15 was the 4th instruction (+6)
* reading PC in Thumb state gives address of instruction + 4
*/
*pc -= 0xa;
}
/* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
* roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
*
* The solution is to arrange for a large out/in scan in this loop and
* and convert data afterwards.
*/
void arm7tdmi_read_core_regs(target_t *target, uint32_t mask, uint32_t* core_regs[16])
{
int i;
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* STMIA r0-15, [r0] at debug speed
* register values will start to appear on 4th DCLK
*/
arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
/* fetch NOP, STM in DECODE stage */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* fetch NOP, STM in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
for (i = 0; i <= 15; i++)
{
if (mask & (1 << i))
/* nothing fetched, STM still in EXECUTE (1 + i cycle) */
arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
}
}
void arm7tdmi_read_core_regs_target_buffer(target_t *target, uint32_t mask, void* buffer, int size)
{
int i;
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
uint32_t *buf_u32 = buffer;
uint16_t *buf_u16 = buffer;
uint8_t *buf_u8 = buffer;
/* STMIA r0-15, [r0] at debug speed
* register values will start to appear on 4th DCLK
*/
arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
/* fetch NOP, STM in DECODE stage */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* fetch NOP, STM in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
for (i = 0; i <= 15; i++)
{
/* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
if (mask & (1 << i))
{
switch (size)
{
case 4:
arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
break;
case 2:
arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
break;
case 1:
arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
break;
}
}
}
}
void arm7tdmi_read_xpsr(target_t *target, uint32_t *xpsr, int spsr)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* MRS r0, cpsr */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
/* STR r0, [r15] */
arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
/* fetch NOP, STR in DECODE stage */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* fetch NOP, STR in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* nothing fetched, STR still in EXECUTE (2nd cycle) */
arm7tdmi_clock_data_in(jtag_info, xpsr);
}
void arm7tdmi_write_xpsr(target_t *target, uint32_t xpsr, int spsr)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
/* MSR1 fetched */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
/* MSR2 fetched, MSR1 in DECODE */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
/* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
/* nothing fetched, MSR1 in EXECUTE (2) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
/* nothing fetched, MSR2 in EXECUTE (2) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* nothing fetched, MSR3 in EXECUTE (2) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* NOP fetched, MSR4 in EXECUTE (1) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* nothing fetched, MSR4 in EXECUTE (2) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
}
void arm7tdmi_write_xpsr_im8(target_t *target, uint8_t xpsr_im, int rot, int spsr)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
/* MSR fetched */
arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
/* NOP fetched, MSR in DECODE */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* NOP fetched, MSR in EXECUTE (1) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* nothing fetched, MSR in EXECUTE (2) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
}
void arm7tdmi_write_core_regs(target_t *target, uint32_t mask, uint32_t core_regs[16])
{
int i;
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* LDMIA r0-15, [r0] at debug speed
* register values will start to appear on 4th DCLK
*/
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
/* fetch NOP, LDM in DECODE stage */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* fetch NOP, LDM in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
for (i = 0; i <= 15; i++)
{
if (mask & (1 << i))
/* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
}
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
}
void arm7tdmi_load_word_regs(target_t *target, uint32_t mask)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed load-multiple into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
}
void arm7tdmi_load_hword_reg(target_t *target, int num)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed load half-word into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
}
void arm7tdmi_load_byte_reg(target_t *target, int num)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed load byte into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
}
void arm7tdmi_store_word_regs(target_t *target, uint32_t mask)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed store-multiple into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
}
void arm7tdmi_store_hword_reg(target_t *target, int num)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed store half-word into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
}
void arm7tdmi_store_byte_reg(target_t *target, int num)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* put system-speed store byte into the pipeline */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
}
void arm7tdmi_write_pc(target_t *target, uint32_t pc)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
/* LDMIA r0-15, [r0] at debug speed
* register values will start to appear on 4th DCLK
*/
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
/* fetch NOP, LDM in DECODE stage */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* fetch NOP, LDM in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
arm7tdmi_clock_out_inner(jtag_info, pc, 0);
/* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* fetch NOP, LDM in EXECUTE stage (4th cycle) */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
/* fetch NOP, LDM in EXECUTE stage (5th cycle) */
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
}
void arm7tdmi_branch_resume(target_t *target)
{
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
}
void arm7tdmi_branch_resume_thumb(target_t *target)
{
LOG_DEBUG("-");
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
reg_t *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
/* LDMIA r0, [r0] at debug speed
* register values will start to appear on 4th DCLK
*/
arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
/* fetch NOP, LDM in DECODE stage */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* fetch NOP, LDM in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32) | 1, NULL, 0);
/* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* Branch and eXchange */
arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
embeddedice_read_reg(dbg_stat);
/* fetch NOP, BX in DECODE stage */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* target is now in Thumb state */
embeddedice_read_reg(dbg_stat);
/* fetch NOP, BX in EXECUTE stage (1st cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
/* target is now in Thumb state */
embeddedice_read_reg(dbg_stat);
/* load r0 value */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
/* fetch NOP, LDR in Decode */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* fetch NOP, LDR in Execute */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
/* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
arm7tdmi_clock_out(jtag_info, buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32), NULL, 0);
/* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
embeddedice_read_reg(dbg_stat);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
}
void arm7tdmi_build_reg_cache(target_t *target)
{
reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
/* get pointers to arch-specific information */
armv4_5_common_t *armv4_5 = target->arch_info;
(*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
armv4_5->core_cache = (*cache_p);
}
int arm7tdmi_examine(struct target_s *target)
{
int retval;
armv4_5_common_t *armv4_5 = target->arch_info;
arm7_9_common_t *arm7_9 = armv4_5->arch_info;
if (!target_was_examined(target))
{
/* get pointers to arch-specific information */
reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
reg_cache_t *t = embeddedice_build_reg_cache(target, arm7_9);
if (t == NULL)
return ERROR_FAIL;
(*cache_p) = t;
arm7_9->eice_cache = (*cache_p);
if (arm7_9->etm_ctx)
{
arm_jtag_t *jtag_info = &arm7_9->jtag_info;
(*cache_p)->next = etm_build_reg_cache(target, jtag_info, arm7_9->etm_ctx);
arm7_9->etm_ctx->reg_cache = (*cache_p)->next;
}
target_set_examined(target);
}
if ((retval = embeddedice_setup(target)) != ERROR_OK)
return retval;
if ((retval = arm7_9_setup(target)) != ERROR_OK)
return retval;
if (arm7_9->etm_ctx)
{
if ((retval = etm_setup(target)) != ERROR_OK)
return retval;
}
return ERROR_OK;
}
int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
{
arm7tdmi_build_reg_cache(target);
return ERROR_OK;
}
int arm7tdmi_quit(void)
{
return ERROR_OK;
}
int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, jtag_tap_t *tap)
{
armv4_5_common_t *armv4_5;
arm7_9_common_t *arm7_9;
arm7_9 = &arm7tdmi->arm7_9_common;
armv4_5 = &arm7_9->armv4_5_common;
/* prepare JTAG information for the new target */
arm7_9->jtag_info.tap = tap;
arm7_9->jtag_info.scann_size = 4;
/* register arch-specific functions */
arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
arm7_9->change_to_arm = arm7tdmi_change_to_arm;
arm7_9->read_core_regs = arm7tdmi_read_core_regs;
arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
arm7_9->read_xpsr = arm7tdmi_read_xpsr;
arm7_9->write_xpsr = arm7tdmi_write_xpsr;
arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
arm7_9->write_core_regs = arm7tdmi_write_core_regs;
arm7_9->load_word_regs = arm7tdmi_load_word_regs;
arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
arm7_9->store_word_regs = arm7tdmi_store_word_regs;
arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
arm7_9->write_pc = arm7tdmi_write_pc;
arm7_9->branch_resume = arm7tdmi_branch_resume;
arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
arm7_9->enable_single_step = arm7_9_enable_eice_step;
arm7_9->disable_single_step = arm7_9_disable_eice_step;
arm7_9->pre_debug_entry = NULL;
arm7_9->post_debug_entry = NULL;
arm7_9->pre_restore_context = NULL;
arm7_9->post_restore_context = NULL;
/* initialize arch-specific breakpoint handling */
arm7_9->arm_bkpt = 0xdeeedeee;
arm7_9->thumb_bkpt = 0xdeee;
arm7_9->dbgreq_adjust_pc = 2;
arm7_9->arch_info = arm7tdmi;
arm7tdmi->arch_info = NULL;
arm7tdmi->common_magic = ARM7TDMI_COMMON_MAGIC;
arm7_9_init_arch_info(target, arm7_9);
return ERROR_OK;
}
int arm7tdmi_target_create(struct target_s *target, Jim_Interp *interp)
{
arm7tdmi_common_t *arm7tdmi;
arm7tdmi = calloc(1,sizeof(arm7tdmi_common_t));
arm7tdmi_init_arch_info(target, arm7tdmi, target->tap);
return ERROR_OK;
}
int arm7tdmi_register_commands(struct command_context_s *cmd_ctx)
{
int retval;
retval = arm7_9_register_commands(cmd_ctx);
return retval;
}
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