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- /***************************************************************************
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * Copyright (C) 2008 by David T.L. Wong *
- * *
- * 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 "mips32.h"
- #include "mips_m4k.h"
- #include "mips32_dmaacc.h"
- #include "jtag.h"
- #include "log.h"
-
- #include <stdlib.h>
- #include <string.h>
-
- /* cli handling */
-
- /* forward declarations */
- int mips_m4k_poll(target_t *target);
- int mips_m4k_halt(struct target_s *target);
- int mips_m4k_soft_reset_halt(struct target_s *target);
- int mips_m4k_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution);
- int mips_m4k_step(struct target_s *target, int current, u32 address, int handle_breakpoints);
- int mips_m4k_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
- int mips_m4k_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer);
- int mips_m4k_register_commands(struct command_context_s *cmd_ctx);
- int mips_m4k_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
- int mips_m4k_quit(void);
- int mips_m4k_target_create(struct target_s *target, Jim_Interp *interp);
-
- int mips_m4k_examine(struct target_s *target);
- int mips_m4k_assert_reset(target_t *target);
- int mips_m4k_deassert_reset(target_t *target);
-
- target_type_t mips_m4k_target =
- {
- .name = "mips_m4k",
-
- .poll = mips_m4k_poll,
- .arch_state = mips32_arch_state,
-
- .target_request_data = NULL,
-
- .halt = mips_m4k_halt,
- .resume = mips_m4k_resume,
- .step = mips_m4k_step,
-
- .assert_reset = mips_m4k_assert_reset,
- .deassert_reset = mips_m4k_deassert_reset,
- .soft_reset_halt = mips_m4k_soft_reset_halt,
-
- .get_gdb_reg_list = mips32_get_gdb_reg_list,
-
- .read_memory = mips_m4k_read_memory,
- .write_memory = mips_m4k_write_memory,
- .bulk_write_memory = mips_m4k_bulk_write_memory,
- .checksum_memory = NULL,
- .blank_check_memory = NULL,
-
- .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,
-
- .register_commands = mips_m4k_register_commands,
- .target_create = mips_m4k_target_create,
- .init_target = mips_m4k_init_target,
- .examine = mips_m4k_examine,
- .quit = mips_m4k_quit
- };
-
- 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;
-
- /* 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;
- }
-
- if (debug_reg & EJTAG_DEBUG_DSS)
- {
- /* stopped due to single step - clear step bit */
- mips_ejtag_config_step(ejtag_info, 0);
- }
-
- mips32_save_context(target);
-
- LOG_DEBUG("entered debug state at PC 0x%x, target->state: %s",
- *(u32*)(mips32->core_cache->reg_list[MIPS32_PC].value),
- Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
-
- return ERROR_OK;
- }
-
- int mips_m4k_poll(target_t *target)
- {
- int retval;
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
- u32 ejtag_ctrl = ejtag_info->ejtag_ctrl;
-
- /* read ejtag control reg */
- jtag_add_end_state(TAP_RTI);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
-
- if (ejtag_ctrl & EJTAG_CTRL_BRKST)
- {
- if ((target->state == TARGET_RUNNING) || (target->state == TARGET_RESET))
- {
- jtag_add_end_state(TAP_RTI);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
-
- target->state = TARGET_HALTED;
-
- if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
- return retval;
-
- target_call_event_callbacks(target, TARGET_EVENT_HALTED);
- }
- else if (target->state == TARGET_DEBUG_RUNNING)
- {
- target->state = TARGET_HALTED;
-
- if ((retval = mips_m4k_debug_entry(target)) != ERROR_OK)
- return retval;
-
- target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
- }
- }
- else
- {
- target->state = TARGET_RUNNING;
- }
-
- if (ejtag_ctrl & EJTAG_CTRL_ROCC)
- {
- /* we have detected a reset, clear flag
- * otherwise ejtag will not work */
- jtag_add_end_state(TAP_RTI);
- ejtag_ctrl = ejtag_info->ejtag_ctrl & ~EJTAG_CTRL_ROCC;
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- LOG_DEBUG("Reset Detected");
- }
-
- // LOG_DEBUG("ctrl=0x%08X", ejtag_ctrl);
-
- return ERROR_OK;
- }
-
- int mips_m4k_halt(struct target_s *target)
- {
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
-
- LOG_DEBUG("target->state: %s",
- Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
-
- 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_reset_config & RESET_SRST_PULLS_TRST) && jtag_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 mips32_prepare_reset_halt()
- */
- 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;
- }
-
- int mips_m4k_assert_reset(target_t *target)
- {
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
-
- LOG_DEBUG("target->state: %s",
- Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
-
- if (!(jtag_reset_config & RESET_HAS_SRST))
- {
- LOG_ERROR("Can't assert SRST");
- return ERROR_FAIL;
- }
-
- if (target->reset_halt)
- {
- /* use hardware to catch reset */
- jtag_add_end_state(TAP_RTI);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_EJTAGBOOT, NULL);
- }
- else
- {
- jtag_add_end_state(TAP_RTI);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_NORMALBOOT, NULL);
- }
-
- if (strcmp(target->variant, "ejtag_srst") == 0)
- {
- u32 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, NULL);
- mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
- }
- else
- {
- /* 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
- {
- jtag_add_reset(0, 1);
- }
- }
-
- target->state = TARGET_RESET;
- jtag_add_sleep(50000);
-
- mips32_invalidate_core_regs(target);
-
- if (target->reset_halt)
- {
- int retval;
- if ((retval = target_halt(target))!=ERROR_OK)
- return retval;
- }
-
-
- return ERROR_OK;
- }
-
- int mips_m4k_deassert_reset(target_t *target)
- {
- LOG_DEBUG("target->state: %s",
- Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
-
- /* deassert reset lines */
- jtag_add_reset(0, 0);
-
- return ERROR_OK;
- }
-
- int mips_m4k_soft_reset_halt(struct target_s *target)
- {
- /* TODO */
- 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;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
- breakpoint_t *breakpoint = NULL;
- u32 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)
- {
- buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
- mips32->core_cache->reg_list[MIPS32_PC].dirty = 1;
- mips32->core_cache->reg_list[MIPS32_PC].valid = 1;
- }
-
- 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 */
- if ((breakpoint = breakpoint_find(target, resume_pc)))
- {
- LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
- mips_m4k_unset_breakpoint(target, breakpoint);
- //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);
-
- /* registers are now invalid */
- mips32_invalidate_core_regs(target);
-
- if (!debug_execution)
- {
- target->state = TARGET_RUNNING;
- target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
- LOG_DEBUG("target resumed at 0x%x", resume_pc);
- }
- else
- {
- target->state = TARGET_DEBUG_RUNNING;
- target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
- LOG_DEBUG("target debug resumed at 0x%x", resume_pc);
- }
-
- return ERROR_OK;
- }
-
- int mips_m4k_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
- {
- /* get pointers to arch-specific information */
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
- breakpoint_t *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)
- buf_set_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32, address);
-
- /* the front-end may request us not to handle breakpoints */
- if (handle_breakpoints)
- if ((breakpoint = breakpoint_find(target, buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32))))
- 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);
-
- /* exit debug mode */
- mips_ejtag_exit_debug(ejtag_info, 1);
-
- /* registers are now invalid */
- mips32_invalidate_core_regs(target);
-
- if (breakpoint)
- mips_m4k_set_breakpoint(target, breakpoint);
-
- LOG_DEBUG("target stepped ");
-
- mips_m4k_debug_entry(target);
- target_call_event_callbacks(target, TARGET_EVENT_HALTED);
-
- return ERROR_OK;
- }
-
- void mips_m4k_enable_breakpoints(struct target_s *target)
- {
- breakpoint_t *breakpoint = target->breakpoints;
-
- /* set any pending breakpoints */
- while (breakpoint)
- {
- if (breakpoint->set == 0)
- mips_m4k_set_breakpoint(target, breakpoint);
- breakpoint = breakpoint->next;
- }
- }
-
- int mips_m4k_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- int mips_m4k_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
- {
- /* TODO */
- return ERROR_OK;
- }
-
- void mips_m4k_enable_watchpoints(struct target_s *target)
- {
- watchpoint_t *watchpoint = target->watchpoints;
-
- /* set any pending watchpoints */
- while (watchpoint)
- {
- if (watchpoint->set == 0)
- mips_m4k_set_watchpoint(target, watchpoint);
- watchpoint = watchpoint->next;
- }
- }
-
- int mips_m4k_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
- {
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
-
- LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", 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_INVALID_ARGUMENTS;
-
- if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
- return ERROR_TARGET_UNALIGNED_ACCESS;
-
- switch (size)
- {
- case 4:
- case 2:
- case 1:
- /* if noDMA off, use DMAACC mode for memory read */
- if(ejtag_info->impcode & EJTAG_IMP_NODMA)
- return mips32_pracc_read_mem(ejtag_info, address, size, count, (void *)buffer);
- else
- return mips32_dmaacc_read_mem(ejtag_info, address, size, count, (void *)buffer);
- default:
- LOG_ERROR("BUG: we shouldn't get here");
- exit(-1);
- break;
- }
-
- return ERROR_OK;
- }
-
- int mips_m4k_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
- {
- mips32_common_t *mips32 = target->arch_info;
- mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
-
- LOG_DEBUG("address: 0x%8.8x, size: 0x%8.8x, count: 0x%8.8x", 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_INVALID_ARGUMENTS;
-
- if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
- return ERROR_TARGET_UNALIGNED_ACCESS;
-
- switch (size)
- {
- case 4:
- case 2:
- case 1:
- /* if noDMA off, use DMAACC mode for memory write */
- if(ejtag_info->impcode & EJTAG_IMP_NODMA)
- mips32_pracc_write_mem(ejtag_info, address, size, count, (void *)buffer);
- else
- mips32_dmaacc_write_mem(ejtag_info, address, size, count, (void *)buffer);
- break;
- default:
- LOG_ERROR("BUG: we shouldn't get here");
- exit(-1);
- break;
- }
-
- return ERROR_OK;
- }
-
- int mips_m4k_register_commands(struct command_context_s *cmd_ctx)
- {
- int retval;
-
- retval = mips32_register_commands(cmd_ctx);
- return retval;
- }
-
- int mips_m4k_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
- {
- mips32_build_reg_cache(target);
-
- return ERROR_OK;
- }
-
- int mips_m4k_quit(void)
- {
- return ERROR_OK;
- }
-
- int mips_m4k_init_arch_info(target_t *target, mips_m4k_common_t *mips_m4k, int chain_pos, const char *variant)
- {
- mips32_common_t *mips32 = &mips_m4k->mips32_common;
-
- if (variant)
- {
- mips_m4k->variant = strdup(variant);
- }
- else
- {
- mips_m4k->variant = strdup("");
- }
-
- mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
-
- /* initialize mips4k specific info */
- mips32_init_arch_info(target, mips32, chain_pos, variant);
- mips32->arch_info = mips_m4k;
-
- return ERROR_OK;
- }
-
- int mips_m4k_target_create(struct target_s *target, Jim_Interp *interp)
- {
- mips_m4k_common_t *mips_m4k = calloc(1,sizeof(mips_m4k_common_t));
-
- mips_m4k_init_arch_info(target, mips_m4k, target->chain_position, target->variant);
-
- return ERROR_OK;
- }
-
- int mips_m4k_examine(struct target_s *target)
- {
- int retval;
- mips32_common_t *mips32 = target->arch_info;
- 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)
- {
- /* 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;
-
- return ERROR_OK;
- }
-
- int mips_m4k_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
- {
- return mips_m4k_write_memory(target, address, 4, count, buffer);
- }
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