target->arch_info = mips32;
mips32->common_magic = MIPS32_COMMON_MAGIC;
+ /* has breakpoint/watchpint unit been scanned */
+ mips32->bp_scanned = 0;
+ mips32->data_break_list = NULL;
+
mips32->ejtag_info.chain_pos = chain_pos;
mips32->read_core_reg = mips32_read_core_reg;
mips32->write_core_reg = mips32_write_core_reg;
/*TODO*/
return ERROR_OK;
}
+
+int mips32_examine(struct target_s *target)
+{
+ mips32_common_t *mips32 = target->arch_info;
+
+ if (!target->type->examined)
+ {
+ target->type->examined = 1;
+
+ /* we will configure later */
+ mips32->bp_scanned = 0;
+ mips32->num_inst_bpoints = 0;
+ mips32->num_data_bpoints = 0;
+ mips32->num_inst_bpoints_avail = 0;
+ mips32->num_data_bpoints_avail = 0;
+ }
+
+ return ERROR_OK;
+}
+
+int mips32_configure_break_unit(struct target_s *target)
+{
+ /* get pointers to arch-specific information */
+ mips32_common_t *mips32 = target->arch_info;
+ int retval;
+ u32 dcr, bpinfo;
+ int i;
+
+ if (mips32->bp_scanned)
+ return ERROR_OK;
+
+ /* get info about breakpoint support */
+ if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
+ return retval;
+
+ if (dcr & (1 << 16))
+ {
+ /* get number of inst breakpoints */
+ if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
+ return retval;
+
+ mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
+ mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
+ mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(mips32_comparator_t));
+ for (i = 0; i < mips32->num_inst_bpoints; i++)
+ {
+ mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
+ }
+
+ /* clear IBIS reg */
+ if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
+ return retval;
+ }
+
+ if (dcr & (1 << 17))
+ {
+ /* get number of data breakpoints */
+ if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
+ return retval;
+
+ mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
+ mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
+ mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(mips32_comparator_t));
+ for (i = 0; i < mips32->num_data_bpoints; i++)
+ {
+ mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
+ }
+
+ /* clear DBIS reg */
+ if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
+ return retval;
+ }
+
+ LOG_DEBUG("DCR 0x%x numinst %i numdata %i", dcr, mips32->num_inst_bpoints, mips32->num_data_bpoints);
+
+ mips32->bp_scanned = 1;
+
+ return ERROR_OK;
+}
.quit = mips_m4k_quit
};
+int mips_m4k_examine_debug_reason(target_t *target)
+{
+ int break_status;
+ int retval;
+
+ if ((target->debug_reason != DBG_REASON_DBGRQ)
+ && (target->debug_reason != DBG_REASON_SINGLESTEP))
+ {
+ /* get info about inst breakpoint support */
+ if ((retval = target_read_u32(target, EJTAG_IBS, &break_status)) != ERROR_OK)
+ return retval;
+ if (break_status & 0x1f)
+ {
+ /* we have halted on a breakpoint */
+ if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
+ return retval;
+ target->debug_reason = DBG_REASON_BREAKPOINT;
+ }
+
+ /* get info about data breakpoint support */
+ if ((retval = target_read_u32(target, 0xFF302000, &break_status)) != ERROR_OK)
+ return retval;
+ if (break_status & 0x1f)
+ {
+ /* we have halted on a breakpoint */
+ if ((retval = target_write_u32(target, 0xFF302000, 0)) != ERROR_OK)
+ return retval;
+ target->debug_reason = DBG_REASON_WATCHPOINT;
+ }
+ }
+
+ return ERROR_OK;
+}
+
int mips_m4k_debug_entry(target_t *target)
{
- u32 debug_reg;
mips32_common_t *mips32 = target->arch_info;
mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+ u32 debug_reg;
/* read debug register */
mips_ejtag_read_debug(ejtag_info, &debug_reg);
- if ((target->debug_reason != DBG_REASON_DBGRQ)
- && (target->debug_reason != DBG_REASON_SINGLESTEP))
- {
-// if (cortex_m3->nvic_dfsr & DFSR_BKPT)
-// {
-// target->debug_reason = DBG_REASON_BREAKPOINT;
-// if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
-// target->debug_reason = DBG_REASON_WPTANDBKPT;
-// }
-// else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
-// target->debug_reason = DBG_REASON_WATCHPOINT;
- }
+ /* make sure break uit configured */
+ mips32_configure_break_unit(target);
+
+ /* attempt to find halt reason */
+ mips_m4k_examine_debug_reason(target);
+ /* clear single step if active */
if (debug_reg & EJTAG_DEBUG_DSS)
{
/* stopped due to single step - clear step bit */
return ERROR_OK;
}
+int mips_m4k_single_step_core(target_t *target)
+{
+ mips32_common_t *mips32 = target->arch_info;
+ mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
+
+ /* configure single step mode */
+ mips_ejtag_config_step(ejtag_info, 1);
+
+ /* exit debug mode */
+ mips_ejtag_exit_debug(ejtag_info, 1);
+
+ mips_m4k_debug_entry(target);
+
+ return ERROR_OK;
+}
+
int mips_m4k_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
{
mips32_common_t *mips32 = target->arch_info;
{
LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
mips_m4k_unset_breakpoint(target, breakpoint);
- //mips_m4k_single_step_core(target);
+ mips_m4k_single_step_core(target);
mips_m4k_set_breakpoint(target, breakpoint);
}
}
/* exit debug mode - enable interrupts if required */
mips_ejtag_exit_debug(ejtag_info, !debug_execution);
+ target->debug_reason = DBG_REASON_NOTHALTED;
/* registers are now invalid */
mips32_invalidate_core_regs(target);
int mips_m4k_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
- /* TODO */
+ mips32_common_t *mips32 = target->arch_info;
+ mips32_comparator_t * comparator_list = mips32->inst_break_list;
+
+ if (breakpoint->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_DEBUG("ERROR Can not find free FP Comparator");
+ LOG_WARNING("ERROR Can not find free FP Comparator");
+ exit(-1);
+ }
+ breakpoint->set = bp_num + 1;
+ comparator_list[bp_num].used = 1;
+ comparator_list[bp_num].bp_value = breakpoint->address;
+ 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 + 0x08, 0x00000000);
+ target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 1);
+ LOG_DEBUG("bp_num %i bp_value 0x%x", bp_num, comparator_list[bp_num].bp_value);
+ }
+ else if (breakpoint->type == BKPT_SOFT)
+ {
+
+ }
+
return ERROR_OK;
}
int mips_m4k_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
- /* TODO */
+ /* get pointers to arch-specific information */
+ mips32_common_t *mips32 = target->arch_info;
+ mips32_comparator_t * comparator_list = mips32->inst_break_list;
+
+ if (!breakpoint->set)
+ {
+ LOG_WARNING("breakpoint not set");
+ return ERROR_OK;
+ }
+
+ if (breakpoint->type == BKPT_HARD)
+ {
+ int bp_num = breakpoint->set - 1;
+ if ((bp_num < 0) || (bp_num >= mips32->num_inst_bpoints))
+ {
+ LOG_DEBUG("Invalid FP Comparator number in breakpoint");
+ return ERROR_OK;
+ }
+ comparator_list[bp_num].used = 0;
+ comparator_list[bp_num].bp_value = 0;
+ target_write_u32(target, comparator_list[bp_num].reg_address + 0x18, 0);
+ }
+ else
+ {
+
+ }
+ breakpoint->set = 0;
+
return ERROR_OK;
}
int mips_m4k_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
- /* TODO */
+ mips32_common_t *mips32 = target->arch_info;
+
+ if (mips32->num_inst_bpoints_avail < 1)
+ {
+ LOG_INFO("no hardware breakpoint available");
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+ }
+
+ /* default to hardware for now */
+ breakpoint->type = BKPT_HARD;
+
+ mips32->num_inst_bpoints_avail--;
+ mips_m4k_set_breakpoint(target, breakpoint);
+
return ERROR_OK;
}
int mips_m4k_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
{
- /* TODO */
+ /* get pointers to arch-specific information */
+ mips32_common_t *mips32 = target->arch_info;
+
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("target not halted");
+ return ERROR_TARGET_NOT_HALTED;
+ }
+
+ if (breakpoint->set)
+ {
+ mips_m4k_unset_breakpoint(target, breakpoint);
+ }
+
+ if (breakpoint->type == BKPT_HARD)
+ mips32->num_inst_bpoints_avail++;
+
return ERROR_OK;
}
mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
u32 idcode = 0;
- target->type->examined = 1;
-
- mips_ejtag_get_idcode(ejtag_info, &idcode, NULL);
-
- if (((idcode >> 1) & 0x7FF) == 0x29)
+ if (!target->type->examined)
{
- /* we are using a pic32mx so select ejtag port
- * as it is not selected by default */
- mips_ejtag_set_instr(ejtag_info, 0x05, NULL);
- LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
+ mips_ejtag_get_idcode(ejtag_info, &idcode, NULL);
+
+ if (((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, 0x05, NULL);
+ LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
+ }
}
/* init rest of ejtag interface */
if ((retval = mips_ejtag_init(ejtag_info)) != ERROR_OK)
return retval;
+ if ((retval = mips32_examine(target)) != ERROR_OK)
+ return retval;
+
return ERROR_OK;
}
projects / openocd / commitdiff