/*************************************************************************** * Copyright (C) 2005 by Dominic Rath * * Dominic.Rath@gmx.de * * * * Copyright (C) 2006 by Magnus Lundin * * lundin@mlu.mine.nu * * * * Copyright (C) 2008 by Spencer Oliver * * spen@spen-soft.co.uk * * * * 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. * * * * * * Cortex-M3(tm) TRM, ARM DDI 0337E (r1p1) and 0337G (r2p0) * * * ***************************************************************************/ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "breakpoints.h" #include "cortex_m3.h" #include "target_request.h" #include "target_type.h" #include "arm_disassembler.h" #include "register.h" #include "arm_opcodes.h" /* NOTE: most of this should work fine for the Cortex-M1 and * Cortex-M0 cores too, although they're ARMv6-M not ARMv7-M. * Some differences: M0/M1 doesn't have FBP remapping or the * DWT tracing/profiling support. (So the cycle counter will * not be usable; the other stuff isn't currently used here.) * * Although there are some workarounds for errata seen only in r0p0 * silicon, such old parts are hard to find and thus not much tested * any longer. */ /* forward declarations */ static int cortex_m3_set_breakpoint(struct target *target, struct breakpoint *breakpoint); static int cortex_m3_unset_breakpoint(struct target *target, struct breakpoint *breakpoint); static void cortex_m3_enable_watchpoints(struct target *target); static int cortex_m3_store_core_reg_u32(struct target *target, enum armv7m_regtype type, uint32_t num, uint32_t value); static int cortexm3_dap_read_coreregister_u32(struct swjdp_common *swjdp, uint32_t *value, int regnum) { int retval; uint32_t dcrdr; /* because the DCB_DCRDR is used for the emulated dcc channel * we have to save/restore the DCB_DCRDR when used */ mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr); swjdp->trans_mode = TRANS_MODE_COMPOSITE; /* mem_ap_write_u32(swjdp, DCB_DCRSR, regnum); */ dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0); dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum); /* mem_ap_read_u32(swjdp, DCB_DCRDR, value); */ dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0); dap_ap_read_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value); retval = swjdp_transaction_endcheck(swjdp); /* restore DCB_DCRDR - this needs to be in a seperate * transaction otherwise the emulated DCC channel breaks */ if (retval == ERROR_OK) retval = mem_ap_write_atomic_u32(swjdp, DCB_DCRDR, dcrdr); return retval; } static int cortexm3_dap_write_coreregister_u32(struct swjdp_common *swjdp, uint32_t value, int regnum) { int retval; uint32_t dcrdr; /* because the DCB_DCRDR is used for the emulated dcc channel * we have to save/restore the DCB_DCRDR when used */ mem_ap_read_u32(swjdp, DCB_DCRDR, &dcrdr); swjdp->trans_mode = TRANS_MODE_COMPOSITE; /* mem_ap_write_u32(swjdp, DCB_DCRDR, core_regs[i]); */ dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRDR & 0xFFFFFFF0); dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRDR & 0xC), value); /* mem_ap_write_u32(swjdp, DCB_DCRSR, i | DCRSR_WnR); */ dap_setup_accessport(swjdp, CSW_32BIT | CSW_ADDRINC_OFF, DCB_DCRSR & 0xFFFFFFF0); dap_ap_write_reg_u32(swjdp, AP_REG_BD0 | (DCB_DCRSR & 0xC), regnum | DCRSR_WnR); retval = swjdp_transaction_endcheck(swjdp); /* restore DCB_DCRDR - this needs to be in a seperate * transaction otherwise the emulated DCC channel breaks */ if (retval == ERROR_OK) retval = mem_ap_write_atomic_u32(swjdp, DCB_DCRDR, dcrdr); return retval; } static int cortex_m3_write_debug_halt_mask(struct target *target, uint32_t mask_on, uint32_t mask_off) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; /* mask off status bits */ cortex_m3->dcb_dhcsr &= ~((0xFFFF << 16) | mask_off); /* create new register mask */ cortex_m3->dcb_dhcsr |= DBGKEY | C_DEBUGEN | mask_on; return mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, cortex_m3->dcb_dhcsr); } static int cortex_m3_clear_halt(struct target *target) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; /* clear step if any */ cortex_m3_write_debug_halt_mask(target, C_HALT, C_STEP); /* Read Debug Fault Status Register */ mem_ap_read_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr); /* Clear Debug Fault Status */ mem_ap_write_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr); LOG_DEBUG(" NVIC_DFSR 0x%" PRIx32 "", cortex_m3->nvic_dfsr); return ERROR_OK; } static int cortex_m3_single_step_core(struct target *target) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; uint32_t dhcsr_save; /* backup dhcsr reg */ dhcsr_save = cortex_m3->dcb_dhcsr; /* Mask interrupts before clearing halt, if done already. This avoids * Erratum 377497 (fixed in r1p0) where setting MASKINTS while clearing * HALT can put the core into an unknown state. */ if (!(cortex_m3->dcb_dhcsr & C_MASKINTS)) mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN); mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN); LOG_DEBUG(" "); /* restore dhcsr reg */ cortex_m3->dcb_dhcsr = dhcsr_save; cortex_m3_clear_halt(target); return ERROR_OK; } static int cortex_m3_endreset_event(struct target *target) { int i; uint32_t dcb_demcr; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct armv7m_common *armv7m = &cortex_m3->armv7m; struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; struct cortex_m3_fp_comparator *fp_list = cortex_m3->fp_comparator_list; struct cortex_m3_dwt_comparator *dwt_list = cortex_m3->dwt_comparator_list; /* REVISIT The four debug monitor bits are currently ignored... */ mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr); LOG_DEBUG("DCB_DEMCR = 0x%8.8" PRIx32 "",dcb_demcr); /* this register is used for emulated dcc channel */ mem_ap_write_u32(swjdp, DCB_DCRDR, 0); /* Enable debug requests */ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN)) mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN); /* clear any interrupt masking */ cortex_m3_write_debug_halt_mask(target, 0, C_MASKINTS); /* Enable features controlled by ITM and DWT blocks, and catch only * the vectors we were told to pay attention to. * * Target firmware is responsible for all fault handling policy * choices *EXCEPT* explicitly scripted overrides like "vector_catch" * or manual updates to the NVIC SHCSR and CCR registers. */ mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | armv7m->demcr); /* Paranoia: evidently some (early?) chips don't preserve all the * debug state (including FBP, DWT, etc) across reset... */ /* Enable FPB */ target_write_u32(target, FP_CTRL, 3); cortex_m3->fpb_enabled = 1; /* Restore FPB registers */ for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++) { target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value); } /* Restore DWT registers */ for (i = 0; i < cortex_m3->dwt_num_comp; i++) { target_write_u32(target, dwt_list[i].dwt_comparator_address + 0, dwt_list[i].comp); target_write_u32(target, dwt_list[i].dwt_comparator_address + 4, dwt_list[i].mask); target_write_u32(target, dwt_list[i].dwt_comparator_address + 8, dwt_list[i].function); } swjdp_transaction_endcheck(swjdp); register_cache_invalidate(cortex_m3->armv7m.core_cache); /* make sure we have latest dhcsr flags */ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); return ERROR_OK; } static int cortex_m3_examine_debug_reason(struct target *target) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */ /* 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)) { 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; else if (cortex_m3->nvic_dfsr & DFSR_VCATCH) target->debug_reason = DBG_REASON_BREAKPOINT; else /* EXTERNAL, HALTED */ target->debug_reason = DBG_REASON_UNDEFINED; } return ERROR_OK; } static int cortex_m3_examine_exception_reason(struct target *target) { uint32_t shcsr, except_sr, cfsr = -1, except_ar = -1; struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; mem_ap_read_u32(swjdp, NVIC_SHCSR, &shcsr); switch (armv7m->exception_number) { case 2: /* NMI */ break; case 3: /* Hard Fault */ mem_ap_read_atomic_u32(swjdp, NVIC_HFSR, &except_sr); if (except_sr & 0x40000000) { mem_ap_read_u32(swjdp, NVIC_CFSR, &cfsr); } break; case 4: /* Memory Management */ mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr); mem_ap_read_u32(swjdp, NVIC_MMFAR, &except_ar); break; case 5: /* Bus Fault */ mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr); mem_ap_read_u32(swjdp, NVIC_BFAR, &except_ar); break; case 6: /* Usage Fault */ mem_ap_read_u32(swjdp, NVIC_CFSR, &except_sr); break; case 11: /* SVCall */ break; case 12: /* Debug Monitor */ mem_ap_read_u32(swjdp, NVIC_DFSR, &except_sr); break; case 14: /* PendSV */ break; case 15: /* SysTick */ break; default: except_sr = 0; break; } swjdp_transaction_endcheck(swjdp); LOG_DEBUG("%s SHCSR 0x%" PRIx32 ", SR 0x%" PRIx32 ", CFSR 0x%" PRIx32 ", AR 0x%" PRIx32 "", armv7m_exception_string(armv7m->exception_number), \ shcsr, except_sr, cfsr, except_ar); return ERROR_OK; } static int cortex_m3_debug_entry(struct target *target) { int i; uint32_t xPSR; int retval; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct armv7m_common *armv7m = &cortex_m3->armv7m; struct swjdp_common *swjdp = &armv7m->swjdp_info; struct reg *r; LOG_DEBUG(" "); cortex_m3_clear_halt(target); mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK) return retval; /* Examine target state and mode */ /* First load register acessible through core debug port*/ int num_regs = armv7m->core_cache->num_regs; for (i = 0; i < num_regs; i++) { if (!armv7m->core_cache->reg_list[i].valid) armv7m->read_core_reg(target, i); } r = armv7m->core_cache->reg_list + ARMV7M_xPSR; xPSR = buf_get_u32(r->value, 0, 32); #ifdef ARMV7_GDB_HACKS /* FIXME this breaks on scan chains with more than one Cortex-M3. * Instead, each CM3 should have its own dummy value... */ /* copy real xpsr reg for gdb, setting thumb bit */ buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR); buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1); armv7m_gdb_dummy_cpsr_reg.valid = r->valid; armv7m_gdb_dummy_cpsr_reg.dirty = r->dirty; #endif /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */ if (xPSR & 0xf00) { r->dirty = r->valid; cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff); } /* Are we in an exception handler */ if (xPSR & 0x1FF) { armv7m->core_mode = ARMV7M_MODE_HANDLER; armv7m->exception_number = (xPSR & 0x1FF); } else { armv7m->core_mode = buf_get_u32(armv7m->core_cache ->reg_list[ARMV7M_CONTROL].value, 0, 1); armv7m->exception_number = 0; } if (armv7m->exception_number) { cortex_m3_examine_exception_reason(target); } LOG_DEBUG("entered debug state in core mode: %s at PC 0x%" PRIx32 ", target->state: %s", armv7m_mode_strings[armv7m->core_mode], *(uint32_t*)(armv7m->core_cache->reg_list[15].value), target_state_name(target)); if (armv7m->post_debug_entry) armv7m->post_debug_entry(target); return ERROR_OK; } static int cortex_m3_poll(struct target *target) { int retval; enum target_state prev_target_state = target->state; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; /* Read from Debug Halting Control and Status Register */ retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); if (retval != ERROR_OK) { target->state = TARGET_UNKNOWN; return retval; } /* Recover from lockup. See ARMv7-M architecture spec, * section B1.5.15 "Unrecoverable exception cases". * * REVISIT Is there a better way to report and handle this? */ if (cortex_m3->dcb_dhcsr & S_LOCKUP) { LOG_WARNING("%s -- clearing lockup after double fault", target_name(target)); cortex_m3_write_debug_halt_mask(target, C_HALT, 0); target->debug_reason = DBG_REASON_DBGRQ; /* refresh status bits */ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); } if (cortex_m3->dcb_dhcsr & S_RESET_ST) { /* check if still in reset */ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); if (cortex_m3->dcb_dhcsr & S_RESET_ST) { target->state = TARGET_RESET; return ERROR_OK; } } if (target->state == TARGET_RESET) { /* Cannot switch context while running so endreset is * called with target->state == TARGET_RESET */ LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%" PRIx32, cortex_m3->dcb_dhcsr); cortex_m3_endreset_event(target); target->state = TARGET_RUNNING; prev_target_state = TARGET_RUNNING; } if (cortex_m3->dcb_dhcsr & S_HALT) { target->state = TARGET_HALTED; if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET)) { if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK) return retval; target_call_event_callbacks(target, TARGET_EVENT_HALTED); } if (prev_target_state == TARGET_DEBUG_RUNNING) { LOG_DEBUG(" "); if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK) return retval; target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED); } } /* REVISIT when S_SLEEP is set, it's in a Sleep or DeepSleep state. * How best to model low power modes? */ if (target->state == TARGET_UNKNOWN) { /* check if processor is retiring instructions */ if (cortex_m3->dcb_dhcsr & S_RETIRE_ST) { target->state = TARGET_RUNNING; return ERROR_OK; } } return ERROR_OK; } static int cortex_m3_halt(struct target *target) { 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 cortex_m3_prepare_reset_halt() */ target->debug_reason = DBG_REASON_DBGRQ; return ERROR_OK; } } /* Write to Debug Halting Control and Status Register */ cortex_m3_write_debug_halt_mask(target, C_HALT, 0); target->debug_reason = DBG_REASON_DBGRQ; return ERROR_OK; } static int cortex_m3_soft_reset_halt(struct target *target) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; uint32_t dcb_dhcsr = 0; int retval, timeout = 0; /* Enter debug state on reset; restore DEMCR in endreset_event() */ mem_ap_write_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET); /* Request a core-only reset */ mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET); target->state = TARGET_RESET; /* registers are now invalid */ register_cache_invalidate(cortex_m3->armv7m.core_cache); while (timeout < 100) { retval = mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr); if (retval == ERROR_OK) { mem_ap_read_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr); if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH)) { LOG_DEBUG("system reset-halted, DHCSR 0x%08x, " "DFSR 0x%08x", (unsigned) dcb_dhcsr, (unsigned) cortex_m3->nvic_dfsr); cortex_m3_poll(target); /* FIXME restore user's vector catch config */ return ERROR_OK; } else LOG_DEBUG("waiting for system reset-halt, " "DHCSR 0x%08x, %d ms", (unsigned) dcb_dhcsr, timeout); } timeout++; alive_sleep(1); } return ERROR_OK; } static void cortex_m3_enable_breakpoints(struct target *target) { struct breakpoint *breakpoint = target->breakpoints; /* set any pending breakpoints */ while (breakpoint) { if (!breakpoint->set) cortex_m3_set_breakpoint(target, breakpoint); breakpoint = breakpoint->next; } } static int cortex_m3_resume(struct target *target, int current, uint32_t address, int handle_breakpoints, int debug_execution) { struct armv7m_common *armv7m = target_to_armv7m(target); struct breakpoint *breakpoint = NULL; uint32_t resume_pc; struct reg *r; if (target->state != TARGET_HALTED) { LOG_WARNING("target not halted"); return ERROR_TARGET_NOT_HALTED; } if (!debug_execution) { target_free_all_working_areas(target); cortex_m3_enable_breakpoints(target); cortex_m3_enable_watchpoints(target); } if (debug_execution) { r = armv7m->core_cache->reg_list + ARMV7M_PRIMASK; /* Disable interrupts */ /* We disable interrupts in the PRIMASK register instead of * masking with C_MASKINTS. This is probably the same issue * as Cortex-M3 Erratum 377493 (fixed in r1p0): C_MASKINTS * in parallel with disabled interrupts can cause local faults * to not be taken. * * REVISIT this clearly breaks non-debug execution, since the * PRIMASK register state isn't saved/restored... workaround * by never resuming app code after debug execution. */ buf_set_u32(r->value, 0, 1, 1); r->dirty = true; r->valid = true; /* Make sure we are in Thumb mode */ r = armv7m->core_cache->reg_list + ARMV7M_xPSR; buf_set_u32(r->value, 24, 1, 1); r->dirty = true; r->valid = true; } /* current = 1: continue on current pc, otherwise continue at
*/ r = armv7m->core_cache->reg_list + 15; if (!current) { buf_set_u32(r->value, 0, 32, address); r->dirty = true; r->valid = true; } /* if we halted last time due to a bkpt instruction * then we have to manually step over it, otherwise * the core will break again */ if (!breakpoint_find(target, buf_get_u32(r->value, 0, 32)) && !debug_execution) { armv7m_maybe_skip_bkpt_inst(target, NULL); } resume_pc = buf_get_u32(r->value, 0, 32); armv7m_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%8.8" PRIx32 " (ID: %d)", breakpoint->address, breakpoint->unique_id); cortex_m3_unset_breakpoint(target, breakpoint); cortex_m3_single_step_core(target); cortex_m3_set_breakpoint(target, breakpoint); } } /* Restart core */ cortex_m3_write_debug_halt_mask(target, 0, C_HALT); target->debug_reason = DBG_REASON_NOTHALTED; /* registers are now invalid */ register_cache_invalidate(armv7m->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; } /* int irqstepcount = 0; */ static int cortex_m3_step(struct target *target, int current, uint32_t address, int handle_breakpoints) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct armv7m_common *armv7m = &cortex_m3->armv7m; struct swjdp_common *swjdp = &armv7m->swjdp_info; struct breakpoint *breakpoint = NULL; struct reg *pc = armv7m->core_cache->reg_list + 15; bool bkpt_inst_found = false; if (target->state != TARGET_HALTED) { LOG_WARNING("target not halted"); return ERROR_TARGET_NOT_HALTED; } /* current = 1: continue on current pc, otherwise continue at
*/ if (!current) buf_set_u32(pc->value, 0, 32, address); /* the front-end may request us not to handle breakpoints */ if (handle_breakpoints) { breakpoint = breakpoint_find(target, buf_get_u32(pc->value, 0, 32)); if (breakpoint) cortex_m3_unset_breakpoint(target, breakpoint); } armv7m_maybe_skip_bkpt_inst(target, &bkpt_inst_found); target->debug_reason = DBG_REASON_SINGLESTEP; armv7m_restore_context(target); target_call_event_callbacks(target, TARGET_EVENT_RESUMED); /* if no bkpt instruction is found at pc then we can perform * a normal step, otherwise we have to manually step over the bkpt * instruction - as such simulate a step */ if (bkpt_inst_found == false) { /* set step and clear halt */ cortex_m3_write_debug_halt_mask(target, C_STEP, C_HALT); } mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); /* registers are now invalid */ register_cache_invalidate(cortex_m3->armv7m.core_cache); if (breakpoint) cortex_m3_set_breakpoint(target, breakpoint); LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32 " nvic_icsr = 0x%" PRIx32, cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr); cortex_m3_debug_entry(target); target_call_event_callbacks(target, TARGET_EVENT_HALTED); LOG_DEBUG("target stepped dcb_dhcsr = 0x%" PRIx32 " nvic_icsr = 0x%" PRIx32, cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr); return ERROR_OK; } static int cortex_m3_assert_reset(struct target *target) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; int assert_srst = 1; LOG_DEBUG("target->state: %s", target_state_name(target)); enum reset_types jtag_reset_config = jtag_get_reset_config(); /* * We can reset Cortex-M3 targets using just the NVIC without * requiring SRST, getting a SoC reset (or a core-only reset) * instead of a system reset. */ if (!(jtag_reset_config & RESET_HAS_SRST)) assert_srst = 0; /* Enable debug requests */ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr); if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN)) mem_ap_write_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN); mem_ap_write_u32(swjdp, DCB_DCRDR, 0); if (!target->reset_halt) { /* Set/Clear C_MASKINTS in a separate operation */ if (cortex_m3->dcb_dhcsr & C_MASKINTS) mem_ap_write_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT); /* clear any debug flags before resuming */ cortex_m3_clear_halt(target); /* clear C_HALT in dhcsr reg */ cortex_m3_write_debug_halt_mask(target, 0, C_HALT); } else { /* Halt in debug on reset; endreset_event() restores DEMCR. * * REVISIT catching BUSERR presumably helps to defend against * bad vector table entries. Should this include MMERR or * other flags too? */ mem_ap_write_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET); } /* * When nRST is asserted on most Stellaris devices, it clears some of * the debug state. The ARMv7M and Cortex-M3 TRMs say that's wrong; * and OpenOCD depends on those TRMs. So we won't use SRST on those * chips. (Only power-on reset should affect debug state, beyond a * few specified bits; not the chip's nRST input, wired to SRST.) * * REVISIT current errata specs don't seem to cover this issue. * Do we have more details than this email? * https://lists.berlios.de/pipermail * /openocd-development/2008-August/003065.html */ if (strcmp(target->variant, "lm3s") == 0) { /* Check for silicon revisions with the issue. */ uint32_t did0; if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK) { switch ((did0 >> 16) & 0xff) { case 0: /* all Sandstorm suffer issue */ assert_srst = 0; break; case 1: case 3: /* Fury and DustDevil rev A have * this nRST problem. It should * be fixed in rev B silicon. */ if (((did0 >> 8) & 0xff) == 0) assert_srst = 0; break; case 4: /* Tempest should be fine. */ break; } } } if (assert_srst) { /* default to asserting srst */ if (jtag_reset_config & RESET_SRST_PULLS_TRST) { jtag_add_reset(1, 1); } else { jtag_add_reset(0, 1); } } else { /* Use a standard Cortex-M3 software reset mechanism. * SYSRESETREQ will reset SoC peripherals outside the * core, like watchdog timers, if the SoC wires it up * correctly. Else VECRESET can reset just the core. */ mem_ap_write_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ); LOG_DEBUG("Using Cortex-M3 SYSRESETREQ"); { /* I do not know why this is necessary, but it * fixes strange effects (step/resume cause NMI * after reset) on LM3S6918 -- Michael Schwingen */ uint32_t tmp; mem_ap_read_atomic_u32(swjdp, NVIC_AIRCR, &tmp); } } target->state = TARGET_RESET; jtag_add_sleep(50000); register_cache_invalidate(cortex_m3->armv7m.core_cache); if (target->reset_halt) { int retval; if ((retval = target_halt(target)) != ERROR_OK) return retval; } return ERROR_OK; } static int cortex_m3_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 cortex_m3_set_breakpoint(struct target *target, struct breakpoint *breakpoint) { int retval; int fp_num = 0; uint32_t hilo; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct cortex_m3_fp_comparator *comparator_list = cortex_m3->fp_comparator_list; if (breakpoint->set) { LOG_WARNING("breakpoint (BPID: %d) already set", breakpoint->unique_id); return ERROR_OK; } if (cortex_m3->auto_bp_type) { breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT; } if (breakpoint->type == BKPT_HARD) { while (comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code)) fp_num++; if (fp_num >= cortex_m3->fp_num_code) { LOG_ERROR("Can not find free FPB Comparator!"); return ERROR_FAIL; } breakpoint->set = fp_num + 1; hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW; comparator_list[fp_num].used = 1; comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1; target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value); LOG_DEBUG("fpc_num %i fpcr_value 0x%" PRIx32 "", fp_num, comparator_list[fp_num].fpcr_value); if (!cortex_m3->fpb_enabled) { LOG_DEBUG("FPB wasn't enabled, do it now"); target_write_u32(target, FP_CTRL, 3); } } else if (breakpoint->type == BKPT_SOFT) { uint8_t code[4]; /* NOTE: on ARMv6-M and ARMv7-M, BKPT(0xab) is used for * semihosting; don't use that. Otherwise the BKPT * parameter is arbitrary. */ buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11)); retval = target_read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr); if (retval != ERROR_OK) return retval; retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code); if (retval != ERROR_OK) return retval; breakpoint->set = true; } LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)", breakpoint->unique_id, (int)(breakpoint->type), breakpoint->address, breakpoint->length, breakpoint->set); return ERROR_OK; } static int cortex_m3_unset_breakpoint(struct target *target, struct breakpoint *breakpoint) { int retval; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct cortex_m3_fp_comparator * comparator_list = cortex_m3->fp_comparator_list; if (!breakpoint->set) { LOG_WARNING("breakpoint not set"); return ERROR_OK; } LOG_DEBUG("BPID: %d, Type: %d, Address: 0x%08" PRIx32 " Length: %d (set=%d)", breakpoint->unique_id, (int)(breakpoint->type), breakpoint->address, breakpoint->length, breakpoint->set); if (breakpoint->type == BKPT_HARD) { int fp_num = breakpoint->set - 1; if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code)) { LOG_DEBUG("Invalid FP Comparator number in breakpoint"); return ERROR_OK; } comparator_list[fp_num].used = 0; comparator_list[fp_num].fpcr_value = 0; target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value); } else { /* restore original instruction (kept in target endianness) */ if (breakpoint->length == 4) { if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr)) != ERROR_OK) { return retval; } } else { if ((retval = target_write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr)) != ERROR_OK) { return retval; } } } breakpoint->set = false; return ERROR_OK; } static int cortex_m3_add_breakpoint(struct target *target, struct breakpoint *breakpoint) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); if (cortex_m3->auto_bp_type) { breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT; #ifdef ARMV7_GDB_HACKS if (breakpoint->length != 2) { /* XXX Hack: Replace all breakpoints with length != 2 with * a hardware breakpoint. */ breakpoint->type = BKPT_HARD; breakpoint->length = 2; } #endif } if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000)) { LOG_INFO("flash patch comparator requested outside code memory region"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000)) { LOG_INFO("soft breakpoint requested in code (flash) memory region"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1)) { LOG_INFO("no flash patch comparator unit available for hardware breakpoint"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } if ((breakpoint->length != 2)) { LOG_INFO("only breakpoints of two bytes length supported"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } if (breakpoint->type == BKPT_HARD) cortex_m3->fp_code_available--; cortex_m3_set_breakpoint(target, breakpoint); return ERROR_OK; } static int cortex_m3_remove_breakpoint(struct target *target, struct breakpoint *breakpoint) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); /* REVISIT why check? FBP can be updated with core running ... */ if (target->state != TARGET_HALTED) { LOG_WARNING("target not halted"); return ERROR_TARGET_NOT_HALTED; } if (cortex_m3->auto_bp_type) { breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT; } if (breakpoint->set) { cortex_m3_unset_breakpoint(target, breakpoint); } if (breakpoint->type == BKPT_HARD) cortex_m3->fp_code_available++; return ERROR_OK; } static int cortex_m3_set_watchpoint(struct target *target, struct watchpoint *watchpoint) { int dwt_num = 0; uint32_t mask, temp; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); /* watchpoint params were validated earlier */ mask = 0; temp = watchpoint->length; while (temp) { temp >>= 1; mask++; } mask--; /* REVISIT Don't fully trust these "not used" records ... users * may set up breakpoints by hand, e.g. dual-address data value * watchpoint using comparator #1; comparator #0 matching cycle * count; send data trace info through ITM and TPIU; etc */ struct cortex_m3_dwt_comparator *comparator; for (comparator = cortex_m3->dwt_comparator_list; comparator->used && dwt_num < cortex_m3->dwt_num_comp; comparator++, dwt_num++) continue; if (dwt_num >= cortex_m3->dwt_num_comp) { LOG_ERROR("Can not find free DWT Comparator"); return ERROR_FAIL; } comparator->used = 1; watchpoint->set = dwt_num + 1; comparator->comp = watchpoint->address; target_write_u32(target, comparator->dwt_comparator_address + 0, comparator->comp); comparator->mask = mask; target_write_u32(target, comparator->dwt_comparator_address + 4, comparator->mask); switch (watchpoint->rw) { case WPT_READ: comparator->function = 5; break; case WPT_WRITE: comparator->function = 6; break; case WPT_ACCESS: comparator->function = 7; break; } target_write_u32(target, comparator->dwt_comparator_address + 8, comparator->function); LOG_DEBUG("Watchpoint (ID %d) DWT%d 0x%08x 0x%x 0x%05x", watchpoint->unique_id, dwt_num, (unsigned) comparator->comp, (unsigned) comparator->mask, (unsigned) comparator->function); return ERROR_OK; } static int cortex_m3_unset_watchpoint(struct target *target, struct watchpoint *watchpoint) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct cortex_m3_dwt_comparator *comparator; int dwt_num; if (!watchpoint->set) { LOG_WARNING("watchpoint (wpid: %d) not set", watchpoint->unique_id); return ERROR_OK; } dwt_num = watchpoint->set - 1; LOG_DEBUG("Watchpoint (ID %d) DWT%d address: 0x%08x clear", watchpoint->unique_id, dwt_num, (unsigned) watchpoint->address); if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp)) { LOG_DEBUG("Invalid DWT Comparator number in watchpoint"); return ERROR_OK; } comparator = cortex_m3->dwt_comparator_list + dwt_num; comparator->used = 0; comparator->function = 0; target_write_u32(target, comparator->dwt_comparator_address + 8, comparator->function); watchpoint->set = false; return ERROR_OK; } static int cortex_m3_add_watchpoint(struct target *target, struct watchpoint *watchpoint) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); if (cortex_m3->dwt_comp_available < 1) { LOG_DEBUG("no comparators?"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } /* hardware doesn't support data value masking */ if (watchpoint->mask != ~(uint32_t)0) { LOG_DEBUG("watchpoint value masks not supported"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } /* hardware allows address masks of up to 32K */ unsigned mask; for (mask = 0; mask < 16; mask++) { if ((1u << mask) == watchpoint->length) break; } if (mask == 16) { LOG_DEBUG("unsupported watchpoint length"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } if (watchpoint->address & ((1 << mask) - 1)) { LOG_DEBUG("watchpoint address is unaligned"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } /* Caller doesn't seem to be able to describe watching for data * values of zero; that flags "no value". * * REVISIT This DWT may well be able to watch for specific data * values. Requires comparator #1 to set DATAVMATCH and match * the data, and another comparator (DATAVADDR0) matching addr. */ if (watchpoint->value) { LOG_DEBUG("data value watchpoint not YET supported"); return ERROR_TARGET_RESOURCE_NOT_AVAILABLE; } cortex_m3->dwt_comp_available--; LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available); return ERROR_OK; } static int cortex_m3_remove_watchpoint(struct target *target, struct watchpoint *watchpoint) { struct cortex_m3_common *cortex_m3 = target_to_cm3(target); /* REVISIT why check? DWT can be updated with core running ... */ if (target->state != TARGET_HALTED) { LOG_WARNING("target not halted"); return ERROR_TARGET_NOT_HALTED; } if (watchpoint->set) { cortex_m3_unset_watchpoint(target, watchpoint); } cortex_m3->dwt_comp_available++; LOG_DEBUG("dwt_comp_available: %d", cortex_m3->dwt_comp_available); return ERROR_OK; } static void cortex_m3_enable_watchpoints(struct target *target) { struct watchpoint *watchpoint = target->watchpoints; /* set any pending watchpoints */ while (watchpoint) { if (!watchpoint->set) cortex_m3_set_watchpoint(target, watchpoint); watchpoint = watchpoint->next; } } static int cortex_m3_load_core_reg_u32(struct target *target, enum armv7m_regtype type, uint32_t num, uint32_t * value) { int retval; struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; /* NOTE: we "know" here that the register identifiers used * in the v7m header match the Cortex-M3 Debug Core Register * Selector values for R0..R15, xPSR, MSP, and PSP. */ switch (num) { case 0 ... 18: /* read a normal core register */ retval = cortexm3_dap_read_coreregister_u32(swjdp, value, num); if (retval != ERROR_OK) { LOG_ERROR("JTAG failure %i",retval); return ERROR_JTAG_DEVICE_ERROR; } LOG_DEBUG("load from core reg %i value 0x%" PRIx32 "",(int)num,*value); break; case ARMV7M_PRIMASK: case ARMV7M_BASEPRI: case ARMV7M_FAULTMASK: case ARMV7M_CONTROL: /* Cortex-M3 packages these four registers as bitfields * in one Debug Core register. So say r0 and r2 docs; * it was removed from r1 docs, but still works. */ cortexm3_dap_read_coreregister_u32(swjdp, value, 20); switch (num) { case ARMV7M_PRIMASK: *value = buf_get_u32((uint8_t*)value, 0, 1); break; case ARMV7M_BASEPRI: *value = buf_get_u32((uint8_t*)value, 8, 8); break; case ARMV7M_FAULTMASK: *value = buf_get_u32((uint8_t*)value, 16, 1); break; case ARMV7M_CONTROL: *value = buf_get_u32((uint8_t*)value, 24, 2); break; } LOG_DEBUG("load from special reg %i value 0x%" PRIx32 "", (int)num, *value); break; default: return ERROR_INVALID_ARGUMENTS; } return ERROR_OK; } static int cortex_m3_store_core_reg_u32(struct target *target, enum armv7m_regtype type, uint32_t num, uint32_t value) { int retval; uint32_t reg; struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; #ifdef ARMV7_GDB_HACKS /* If the LR register is being modified, make sure it will put us * in "thumb" mode, or an INVSTATE exception will occur. This is a * hack to deal with the fact that gdb will sometimes "forge" * return addresses, and doesn't set the LSB correctly (i.e., when * printing expressions containing function calls, it sets LR = 0.) * Valid exception return codes have bit 0 set too. */ if (num == ARMV7M_R14) value |= 0x01; #endif /* NOTE: we "know" here that the register identifiers used * in the v7m header match the Cortex-M3 Debug Core Register * Selector values for R0..R15, xPSR, MSP, and PSP. */ switch (num) { case 0 ... 18: retval = cortexm3_dap_write_coreregister_u32(swjdp, value, num); if (retval != ERROR_OK) { struct reg *r; LOG_ERROR("JTAG failure %i", retval); r = armv7m->core_cache->reg_list + num; r->dirty = r->valid; return ERROR_JTAG_DEVICE_ERROR; } LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", (int)num, value); break; case ARMV7M_PRIMASK: case ARMV7M_BASEPRI: case ARMV7M_FAULTMASK: case ARMV7M_CONTROL: /* Cortex-M3 packages these four registers as bitfields * in one Debug Core register. So say r0 and r2 docs; * it was removed from r1 docs, but still works. */ cortexm3_dap_read_coreregister_u32(swjdp, ®, 20); switch (num) { case ARMV7M_PRIMASK: buf_set_u32((uint8_t*)®, 0, 1, value); break; case ARMV7M_BASEPRI: buf_set_u32((uint8_t*)®, 8, 8, value); break; case ARMV7M_FAULTMASK: buf_set_u32((uint8_t*)®, 16, 1, value); break; case ARMV7M_CONTROL: buf_set_u32((uint8_t*)®, 24, 2, value); break; } cortexm3_dap_write_coreregister_u32(swjdp, reg, 20); LOG_DEBUG("write special reg %i value 0x%" PRIx32 " ", (int)num, value); break; default: return ERROR_INVALID_ARGUMENTS; } return ERROR_OK; } static int cortex_m3_read_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer) { struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; int retval = ERROR_INVALID_ARGUMENTS; /* cortex_m3 handles unaligned memory access */ if (count && buffer) { switch (size) { case 4: retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address); break; case 2: retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address); break; case 1: retval = mem_ap_read_buf_u8(swjdp, buffer, count, address); break; } } return retval; } static int cortex_m3_write_memory(struct target *target, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer) { struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; int retval = ERROR_INVALID_ARGUMENTS; if (count && buffer) { switch (size) { case 4: retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address); break; case 2: retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address); break; case 1: retval = mem_ap_write_buf_u8(swjdp, buffer, count, address); break; } } return retval; } static int cortex_m3_bulk_write_memory(struct target *target, uint32_t address, uint32_t count, uint8_t *buffer) { return cortex_m3_write_memory(target, address, 4, count, buffer); } static int cortex_m3_init_target(struct command_context *cmd_ctx, struct target *target) { armv7m_build_reg_cache(target); return ERROR_OK; } /* REVISIT cache valid/dirty bits are unmaintained. We could set "valid" * on r/w if the core is not running, and clear on resume or reset ... or * at least, in a post_restore_context() method. */ struct dwt_reg_state { struct target *target; uint32_t addr; uint32_t value; /* scratch/cache */ }; static int cortex_m3_dwt_get_reg(struct reg *reg) { struct dwt_reg_state *state = reg->arch_info; return target_read_u32(state->target, state->addr, &state->value); } static int cortex_m3_dwt_set_reg(struct reg *reg, uint8_t *buf) { struct dwt_reg_state *state = reg->arch_info; return target_write_u32(state->target, state->addr, buf_get_u32(buf, 0, reg->size)); } struct dwt_reg { uint32_t addr; char *name; unsigned size; }; static struct dwt_reg dwt_base_regs[] = { { DWT_CTRL, "dwt_ctrl", 32, }, /* NOTE that Erratum 532314 (fixed r2p0) affects CYCCNT: it wrongly * increments while the core is asleep. */ { DWT_CYCCNT, "dwt_cyccnt", 32, }, /* plus some 8 bit counters, useful for profiling with TPIU */ }; static struct dwt_reg dwt_comp[] = { #define DWT_COMPARATOR(i) \ { DWT_COMP0 + 0x10 * (i), "dwt_" #i "_comp", 32, }, \ { DWT_MASK0 + 0x10 * (i), "dwt_" #i "_mask", 4, }, \ { DWT_FUNCTION0 + 0x10 * (i), "dwt_" #i "_function", 32, } DWT_COMPARATOR(0), DWT_COMPARATOR(1), DWT_COMPARATOR(2), DWT_COMPARATOR(3), #undef DWT_COMPARATOR }; static const struct reg_arch_type dwt_reg_type = { .get = cortex_m3_dwt_get_reg, .set = cortex_m3_dwt_set_reg, }; static void cortex_m3_dwt_addreg(struct target *t, struct reg *r, struct dwt_reg *d) { struct dwt_reg_state *state; state = calloc(1, sizeof *state); if (!state) return; state->addr = d->addr; state->target = t; r->name = d->name; r->size = d->size; r->value = &state->value; r->arch_info = state; r->type = &dwt_reg_type; } static void cortex_m3_dwt_setup(struct cortex_m3_common *cm3, struct target *target) { uint32_t dwtcr; struct reg_cache *cache; struct cortex_m3_dwt_comparator *comparator; int reg, i; target_read_u32(target, DWT_CTRL, &dwtcr); if (!dwtcr) { LOG_DEBUG("no DWT"); return; } cm3->dwt_num_comp = (dwtcr >> 28) & 0xF; cm3->dwt_comp_available = cm3->dwt_num_comp; cm3->dwt_comparator_list = calloc(cm3->dwt_num_comp, sizeof(struct cortex_m3_dwt_comparator)); if (!cm3->dwt_comparator_list) { fail0: cm3->dwt_num_comp = 0; LOG_ERROR("out of mem"); return; } cache = calloc(1, sizeof *cache); if (!cache) { fail1: free(cm3->dwt_comparator_list); goto fail0; } cache->name = "cortex-m3 dwt registers"; cache->num_regs = 2 + cm3->dwt_num_comp * 3; cache->reg_list = calloc(cache->num_regs, sizeof *cache->reg_list); if (!cache->reg_list) { free(cache); goto fail1; } for (reg = 0; reg < 2; reg++) cortex_m3_dwt_addreg(target, cache->reg_list + reg, dwt_base_regs + reg); comparator = cm3->dwt_comparator_list; for (i = 0; i < cm3->dwt_num_comp; i++, comparator++) { int j; comparator->dwt_comparator_address = DWT_COMP0 + 0x10 * i; for (j = 0; j < 3; j++, reg++) cortex_m3_dwt_addreg(target, cache->reg_list + reg, dwt_comp + 3 * i + j); } *register_get_last_cache_p(&target->reg_cache) = cache; cm3->dwt_cache = cache; LOG_DEBUG("DWT dwtcr 0x%" PRIx32 ", comp %d, watch%s", dwtcr, cm3->dwt_num_comp, (dwtcr & (0xf << 24)) ? " only" : "/trigger"); /* REVISIT: if num_comp > 1, check whether comparator #1 can * implement single-address data value watchpoints ... so we * won't need to check it later, when asked to set one up. */ } static int cortex_m3_examine(struct target *target) { int retval; uint32_t cpuid, fpcr; int i; struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct swjdp_common *swjdp = &cortex_m3->armv7m.swjdp_info; if ((retval = ahbap_debugport_init(swjdp)) != ERROR_OK) return retval; if (!target_was_examined(target)) { target_set_examined(target); /* Read from Device Identification Registers */ retval = target_read_u32(target, CPUID, &cpuid); if (retval != ERROR_OK) return retval; if (((cpuid >> 4) & 0xc3f) == 0xc23) LOG_DEBUG("Cortex-M3 r%" PRId8 "p%" PRId8 " processor detected", (uint8_t)((cpuid >> 20) & 0xf), (uint8_t)((cpuid >> 0) & 0xf)); LOG_DEBUG("cpuid: 0x%8.8" PRIx32 "", cpuid); /* NOTE: FPB and DWT are both optional. */ /* Setup FPB */ target_read_u32(target, FP_CTRL, &fpcr); cortex_m3->auto_bp_type = 1; cortex_m3->fp_num_code = ((fpcr >> 8) & 0x70) | ((fpcr >> 4) & 0xF); /* bits [14:12] and [7:4] */ cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF; cortex_m3->fp_code_available = cortex_m3->fp_num_code; cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(struct cortex_m3_fp_comparator)); cortex_m3->fpb_enabled = fpcr & 1; for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++) { cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL; cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i; } LOG_DEBUG("FPB fpcr 0x%" PRIx32 ", numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit); /* Setup DWT */ cortex_m3_dwt_setup(cortex_m3, target); /* These hardware breakpoints only work for code in flash! */ LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints", target_name(target), cortex_m3->fp_num_code, cortex_m3->dwt_num_comp); } return ERROR_OK; } static int cortex_m3_dcc_read(struct swjdp_common *swjdp, uint8_t *value, uint8_t *ctrl) { uint16_t dcrdr; mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR); *ctrl = (uint8_t)dcrdr; *value = (uint8_t)(dcrdr >> 8); LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl); /* write ack back to software dcc register * signify we have read data */ if (dcrdr & (1 << 0)) { dcrdr = 0; mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR); } return ERROR_OK; } static int cortex_m3_target_request_data(struct target *target, uint32_t size, uint8_t *buffer) { struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; uint8_t data; uint8_t ctrl; uint32_t i; for (i = 0; i < (size * 4); i++) { cortex_m3_dcc_read(swjdp, &data, &ctrl); buffer[i] = data; } return ERROR_OK; } static int cortex_m3_handle_target_request(void *priv) { struct target *target = priv; if (!target_was_examined(target)) return ERROR_OK; struct armv7m_common *armv7m = target_to_armv7m(target); struct swjdp_common *swjdp = &armv7m->swjdp_info; if (!target->dbg_msg_enabled) return ERROR_OK; if (target->state == TARGET_RUNNING) { uint8_t data; uint8_t ctrl; cortex_m3_dcc_read(swjdp, &data, &ctrl); /* check if we have data */ if (ctrl & (1 << 0)) { uint32_t request; /* we assume target is quick enough */ request = data; cortex_m3_dcc_read(swjdp, &data, &ctrl); request |= (data << 8); cortex_m3_dcc_read(swjdp, &data, &ctrl); request |= (data << 16); cortex_m3_dcc_read(swjdp, &data, &ctrl); request |= (data << 24); target_request(target, request); } } return ERROR_OK; } static int cortex_m3_init_arch_info(struct target *target, struct cortex_m3_common *cortex_m3, struct jtag_tap *tap) { int retval; struct armv7m_common *armv7m = &cortex_m3->armv7m; armv7m_init_arch_info(target, armv7m); /* prepare JTAG information for the new target */ cortex_m3->jtag_info.tap = tap; cortex_m3->jtag_info.scann_size = 4; armv7m->swjdp_info.dp_select_value = -1; armv7m->swjdp_info.ap_csw_value = -1; armv7m->swjdp_info.ap_tar_value = -1; armv7m->swjdp_info.jtag_info = &cortex_m3->jtag_info; armv7m->swjdp_info.memaccess_tck = 8; armv7m->swjdp_info.tar_autoincr_block = (1 << 12); /* Cortex-M3 has 4096 bytes autoincrement range */ /* register arch-specific functions */ armv7m->examine_debug_reason = cortex_m3_examine_debug_reason; armv7m->post_debug_entry = NULL; armv7m->pre_restore_context = NULL; armv7m->post_restore_context = NULL; armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32; armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32; target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target); if ((retval = arm_jtag_setup_connection(&cortex_m3->jtag_info)) != ERROR_OK) { return retval; } return ERROR_OK; } static int cortex_m3_target_create(struct target *target, Jim_Interp *interp) { struct cortex_m3_common *cortex_m3 = calloc(1,sizeof(struct cortex_m3_common)); cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC; cortex_m3_init_arch_info(target, cortex_m3, target->tap); return ERROR_OK; } /*--------------------------------------------------------------------------*/ static int cortex_m3_verify_pointer(struct command_context *cmd_ctx, struct cortex_m3_common *cm3) { if (cm3->common_magic != CORTEX_M3_COMMON_MAGIC) { command_print(cmd_ctx, "target is not a Cortex-M3"); return ERROR_TARGET_INVALID; } return ERROR_OK; } /* * Only stuff below this line should need to verify that its target * is a Cortex-M3. Everything else should have indirected through the * cortexm3_target structure, which is only used with CM3 targets. */ /* * REVISIT Thumb2 disassembly should work for all ARMv7 cores, as well * as at least ARM-1156T2. The interesting thing about Cortex-M is * that *only* Thumb2 disassembly matters. There are also some small * additions to Thumb2 that are specific to ARMv7-M. */ COMMAND_HANDLER(handle_cortex_m3_disassemble_command) { int retval; struct target *target = get_current_target(CMD_CTX); struct cortex_m3_common *cortex_m3 = target_to_cm3(target); uint32_t address; unsigned long count = 1; struct arm_instruction cur_instruction; retval = cortex_m3_verify_pointer(CMD_CTX, cortex_m3); if (retval != ERROR_OK) return retval; errno = 0; switch (CMD_ARGC) { case 2: COMMAND_PARSE_NUMBER(ulong, CMD_ARGV[1], count); /* FALL THROUGH */ case 1: COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address); break; default: command_print(CMD_CTX, "usage: cortex_m3 disassemble
[]"); return ERROR_OK; } while (count--) { retval = thumb2_opcode(target, address, &cur_instruction); if (retval != ERROR_OK) return retval; command_print(CMD_CTX, "%s", cur_instruction.text); address += cur_instruction.instruction_size; } return ERROR_OK; } static const struct { char name[10]; unsigned mask; } vec_ids[] = { { "hard_err", VC_HARDERR, }, { "int_err", VC_INTERR, }, { "bus_err", VC_BUSERR, }, { "state_err", VC_STATERR, }, { "chk_err", VC_CHKERR, }, { "nocp_err", VC_NOCPERR, }, { "mm_err", VC_MMERR, }, { "reset", VC_CORERESET, }, }; COMMAND_HANDLER(handle_cortex_m3_vector_catch_command) { struct target *target = get_current_target(CMD_CTX); struct cortex_m3_common *cortex_m3 = target_to_cm3(target); struct armv7m_common *armv7m = &cortex_m3->armv7m; struct swjdp_common *swjdp = &armv7m->swjdp_info; uint32_t demcr = 0; int retval; retval = cortex_m3_verify_pointer(CMD_CTX, cortex_m3); if (retval != ERROR_OK) return retval; mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr); if (CMD_ARGC > 0) { unsigned catch = 0; if (CMD_ARGC == 1) { if (strcmp(CMD_ARGV[0], "all") == 0) { catch = VC_HARDERR | VC_INTERR | VC_BUSERR | VC_STATERR | VC_CHKERR | VC_NOCPERR | VC_MMERR | VC_CORERESET; goto write; } else if (strcmp(CMD_ARGV[0], "none") == 0) { goto write; } } while (CMD_ARGC-- > 0) { unsigned i; for (i = 0; i < ARRAY_SIZE(vec_ids); i++) { if (strcmp(CMD_ARGV[CMD_ARGC], vec_ids[i].name) != 0) continue; catch |= vec_ids[i].mask; break; } if (i == ARRAY_SIZE(vec_ids)) { LOG_ERROR("No CM3 vector '%s'", CMD_ARGV[CMD_ARGC]); return ERROR_INVALID_ARGUMENTS; } } write: /* For now, armv7m->demcr only stores vector catch flags. */ armv7m->demcr = catch; demcr &= ~0xffff; demcr |= catch; /* write, but don't assume it stuck (why not??) */ mem_ap_write_u32(swjdp, DCB_DEMCR, demcr); mem_ap_read_atomic_u32(swjdp, DCB_DEMCR, &demcr); /* FIXME be sure to clear DEMCR on clean server shutdown. * Otherwise the vector catch hardware could fire when there's * no debugger hooked up, causing much confusion... */ } for (unsigned i = 0; i < ARRAY_SIZE(vec_ids); i++) { command_print(CMD_CTX, "%9s: %s", vec_ids[i].name, (demcr & vec_ids[i].mask) ? "catch" : "ignore"); } return ERROR_OK; } COMMAND_HANDLER(handle_cortex_m3_mask_interrupts_command) { struct target *target = get_current_target(CMD_CTX); struct cortex_m3_common *cortex_m3 = target_to_cm3(target); int retval; retval = cortex_m3_verify_pointer(CMD_CTX, cortex_m3); if (retval != ERROR_OK) return retval; if (target->state != TARGET_HALTED) { command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME); return ERROR_OK; } if (CMD_ARGC > 0) { bool enable; COMMAND_PARSE_ON_OFF(CMD_ARGV[0], enable); uint32_t mask_on = C_HALT | (enable ? C_MASKINTS : 0); uint32_t mask_off = enable ? 0 : C_MASKINTS; cortex_m3_write_debug_halt_mask(target, mask_on, mask_off); } command_print(CMD_CTX, "cortex_m3 interrupt mask %s", (cortex_m3->dcb_dhcsr & C_MASKINTS) ? "on" : "off"); return ERROR_OK; } static const struct command_registration cortex_m3_exec_command_handlers[] = { { .name = "disassemble", .handler = handle_cortex_m3_disassemble_command, .mode = COMMAND_EXEC, .help = "disassemble Thumb2 instructions", .usage = "address [count]", }, { .name = "maskisr", .handler = handle_cortex_m3_mask_interrupts_command, .mode = COMMAND_EXEC, .help = "mask cortex_m3 interrupts", .usage = "['on'|'off']", }, { .name = "vector_catch", .handler = handle_cortex_m3_vector_catch_command, .mode = COMMAND_EXEC, .help = "configure hardware vectors to trigger debug entry", .usage = "['all'|'none'|('bus_err'|'chk_err'|...)*]", }, COMMAND_REGISTRATION_DONE }; static const struct command_registration cortex_m3_command_handlers[] = { { .chain = armv7m_command_handlers, }, { .name = "cortex_m3", .mode = COMMAND_EXEC, .help = "Cortex-M3 command group", .chain = cortex_m3_exec_command_handlers, }, COMMAND_REGISTRATION_DONE }; struct target_type cortexm3_target = { .name = "cortex_m3", .poll = cortex_m3_poll, .arch_state = armv7m_arch_state, .target_request_data = cortex_m3_target_request_data, .halt = cortex_m3_halt, .resume = cortex_m3_resume, .step = cortex_m3_step, .assert_reset = cortex_m3_assert_reset, .deassert_reset = cortex_m3_deassert_reset, .soft_reset_halt = cortex_m3_soft_reset_halt, .get_gdb_reg_list = armv7m_get_gdb_reg_list, .read_memory = cortex_m3_read_memory, .write_memory = cortex_m3_write_memory, .bulk_write_memory = cortex_m3_bulk_write_memory, .checksum_memory = armv7m_checksum_memory, .blank_check_memory = armv7m_blank_check_memory, .run_algorithm = armv7m_run_algorithm, .add_breakpoint = cortex_m3_add_breakpoint, .remove_breakpoint = cortex_m3_remove_breakpoint, .add_watchpoint = cortex_m3_add_watchpoint, .remove_watchpoint = cortex_m3_remove_watchpoint, .commands = cortex_m3_command_handlers, .target_create = cortex_m3_target_create, .init_target = cortex_m3_init_target, .examine = cortex_m3_examine, };