#include "arm.h"
#include "arm_dpm.h"
+#include "armv8_dpm.h"
#include <jtag/jtag.h>
#include "register.h"
#include "breakpoints.h"
return retval;
}
-
-static int dpm_read_reg32(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+/* just read the register -- rely on the core mode being right */
+static int dpm_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
{
uint32_t value;
- int retval = ERROR_FAIL;
+ int retval;
switch (regnum) {
case 0 ... 14:
/* core-specific ... ? */
LOG_WARNING("Jazelle PC adjustment unknown");
break;
- case ARM_STATE_AARCH64:
- LOG_ERROR("AARCH64: 32bit read requested");
+ default:
+ LOG_WARNING("unknow core state");
break;
}
break;
return retval;
}
-static int dpm_read_reg64(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
-{
- uint64_t value;
- uint32_t i;
- int retval = ERROR_FAIL;
-
- switch (regnum) {
- case 0 ... 30:
- i = 0xd5130400 + regnum; /* msr dbgdtr_el0,reg */
- retval = dpm->instr_read_data_dcc_64(dpm, i, &value);
- break;
- case 31: /* SP */
- i = 0x910003e0;
- retval = dpm->instr_read_data_r0_64(dpm, i, &value);
- break;
- case 32: /* PC */
- i = 0xd53b4520;
- retval = dpm->instr_read_data_r0_64(dpm, i, &value);
- break;
- case 33: /* CPSR */
- i = 0xd53b4500;
- retval = dpm->instr_read_data_r0_64(dpm, i, &value);
- break;
-
- default:
- break;
- }
-
- if (retval == ERROR_OK) {
- buf_set_u64(r->value, 0, 64, value);
- r->valid = true;
- r->dirty = false;
- LOG_DEBUG("READ: %s, %16.16llx", r->name, (long long)value);
- }
-
- return retval;
-}
-
-
-/* just read the register -- rely on the core mode being right */
-static int dpm_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
-{
- if (r->size == 64)
- return dpm_read_reg64(dpm, r, regnum);
- else
- return dpm_read_reg32(dpm, r, regnum);
-}
-
-static int dpm_write_reg32(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+/* just write the register -- rely on the core mode being right */
+static int dpm_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
{
- int retval = ERROR_FAIL;
+ int retval;
uint32_t value = buf_get_u32(r->value, 0, 32);
switch (regnum) {
return dpm->instr_write_data_r0(dpm, ARMV4_5_BX(0), value);
}
-static int dpm_write_reg64(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
-{
- int retval = ERROR_FAIL;
- uint32_t i;
- uint64_t value = buf_get_u64(r->value, 0, 64);
-
- switch (regnum) {
- case 0 ... 30:
- i = 0xd5330400 + regnum;
- retval = dpm->instr_write_data_dcc_64(dpm, i, value);
- break;
- case 32: /* PC */
- i = 0xd51b4520;
- retval = dpm->instr_write_data_r0_64(dpm, i, value);
- break;
- default:
- LOG_DEBUG("register %s (%16.16llx) not defined", r->name,
- (unsigned long long)value);
- break;
- }
-
- if (retval == ERROR_OK) {
- r->dirty = false;
- LOG_DEBUG("WRITE: %s, %16.16llx", r->name, (unsigned long long)value);
- }
-
- return retval;
-}
-
-/* just write the register -- rely on the core mode being right */
-static int dpm_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
-{
- if (r->size == 64)
- return dpm_write_reg64(dpm, r, regnum);
- else
- return dpm_write_reg32(dpm, r, regnum);
-}
-
-static int arm_dpm_read_current_registers_i(struct arm_dpm *dpm)
+/**
+ * Read basic registers of the the current context: R0 to R15, and CPSR;
+ * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
+ * In normal operation this is called on entry to halting debug state,
+ * possibly after some other operations supporting restore of debug state
+ * or making sure the CPU is fully idle (drain write buffer, etc).
+ */
+int arm_dpm_read_current_registers(struct arm_dpm *dpm)
{
struct arm *arm = dpm->arm;
- uint32_t cpsr, instr, core_regs;
+ uint32_t cpsr;
int retval;
struct reg *r;
- enum arm_state core_state = arm->core_state;
retval = dpm->prepare(dpm);
if (retval != ERROR_OK)
}
r->dirty = true;
- if (core_state == ARM_STATE_AARCH64)
- instr = 0xd53b4500; /* mrs x0, dspsr_el0 */
- else
- instr = ARMV4_5_MRS(0, 0);
- retval = dpm->instr_read_data_r0(dpm, instr, &cpsr);
+ retval = dpm->instr_read_data_r0(dpm, ARMV4_5_MRS(0, 0), &cpsr);
if (retval != ERROR_OK)
goto fail;
/* update core mode and state, plus shadow mapping for R8..R14 */
arm_set_cpsr(arm, cpsr);
- if (core_state == ARM_STATE_AARCH64)
- /* arm_set_cpsr changes core_state, restore it for now */
- arm->core_state = ARM_STATE_AARCH64;
-
- core_regs = arm->core_cache->num_regs;
/* REVISIT we can probably avoid reading R1..R14, saving time... */
- for (unsigned i = 1; i < core_regs; i++) {
- r = dpm->arm_reg_current(arm, i);
+ for (unsigned i = 1; i < 16; i++) {
+ r = arm_reg_current(arm, i);
if (r->valid)
continue;
return retval;
}
-/**
- * Read basic registers of the the current context: R0 to R15, and CPSR;
- * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
- * In normal operation this is called on entry to halting debug state,
- * possibly after some other operations supporting restore of debug state
- * or making sure the CPU is fully idle (drain write buffer, etc).
- */
-int arm_dpm_read_current_registers(struct arm_dpm *dpm)
-{
- return arm_dpm_read_current_registers_i(dpm);
-}
-
-int arm_dpm_read_current_registers_64(struct arm_dpm *dpm)
-{
- return arm_dpm_read_current_registers_i(dpm);
-}
-
/* Avoid needless I/O ... leave breakpoints and watchpoints alone
* unless they're removed, or need updating because of single-stepping
* or running debugger code.
static int dpm_add_breakpoint(struct target *target, struct breakpoint *bp);
-
-static int arm_dpm_write_dirty_registers_32(struct arm_dpm *dpm)
+/**
+ * Writes all modified core registers for all processor modes. In normal
+ * operation this is called on exit from halting debug state.
+ *
+ * @param dpm: represents the processor
+ * @param bpwp: true ensures breakpoints and watchpoints are set,
+ * false ensures they are cleared
+ */
+int arm_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
{
struct arm *arm = dpm->arm;
struct reg_cache *cache = arm->core_cache;
int retval;
bool did_write;
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ goto done;
+
+ /* If we're managing hardware breakpoints for this core, enable
+ * or disable them as requested.
+ *
+ * REVISIT We don't yet manage them for ANY cores. Eventually
+ * we should be able to assume we handle them; but until then,
+ * cope with the hand-crafted breakpoint code.
+ */
+ if (arm->target->type->add_breakpoint == dpm_add_breakpoint) {
+ for (unsigned i = 0; i < dpm->nbp; i++) {
+ struct dpm_bp *dbp = dpm->dbp + i;
+ struct breakpoint *bp = dbp->bp;
+
+ retval = dpm_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
+ bp ? &bp->set : NULL);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+ }
+
+ /* enable/disable watchpoints */
+ for (unsigned i = 0; i < dpm->nwp; i++) {
+ struct dpm_wp *dwp = dpm->dwp + i;
+ struct watchpoint *wp = dwp->wp;
+
+ retval = dpm_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
+ wp ? &wp->set : NULL);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+
+ /* NOTE: writes to breakpoint and watchpoint registers might
+ * be queued, and need (efficient/batched) flushing later.
+ */
+
/* Scan the registers until we find one that's both dirty and
* eligible for flushing. Flush that and everything else that
* shares the same core mode setting. Typically this won't
goto done;
cache->reg_list[0].dirty = false;
-done:
- return retval;
-}
-
-static int arm_dpm_write_dirty_registers_64(struct arm_dpm *dpm)
-{
- struct arm *arm = dpm->arm;
- struct reg_cache *cache = arm->core_cache;
- int retval;
-
- /* Scan the registers until we find one that's both dirty and
- * eligible for flushing. Flush that and everything else that
- * shares the same core mode setting. Typically this won't
- * actually find anything to do...
- */
-
- /* check everything except our scratch register R0 */
- for (unsigned i = 1; i <= 32; i++) {
- struct arm_reg *r;
- unsigned regnum;
-
- if (!cache->reg_list[i].dirty)
- continue;
-
- r = cache->reg_list[i].arch_info;
- regnum = r->num;
- retval = dpm_write_reg(dpm,
- &cache->reg_list[i],
- regnum);
- if (retval != ERROR_OK)
- goto done;
- }
-
- /* flush R0 -- it's *very* dirty by now */
- retval = dpm_write_reg(dpm, &cache->reg_list[0], 0);
- if (retval != ERROR_OK)
- goto done;
- cache->reg_list[0].dirty = false;
-
-done:
- return retval;
-}
-
-/**
- * Writes all modified core registers for all processor modes. In normal
- * operation this is called on exit from halting debug state.
- *
- * @param dpm: represents the processor
- * @param bpwp: true ensures breakpoints and watchpoints are set,
- * false ensures they are cleared
- */
-int arm_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
-{
- struct arm *arm = dpm->arm;
- struct reg_cache *cache = arm->core_cache;
- int retval;
-
- retval = dpm->prepare(dpm);
- if (retval != ERROR_OK)
- goto done;
-
- /* If we're managing hardware breakpoints for this core, enable
- * or disable them as requested.
- *
- * REVISIT We don't yet manage them for ANY cores. Eventually
- * we should be able to assume we handle them; but until then,
- * cope with the hand-crafted breakpoint code.
- */
- if (arm->target->type->add_breakpoint == dpm_add_breakpoint) {
- for (unsigned i = 0; i < dpm->nbp; i++) {
- struct dpm_bp *dbp = dpm->dbp + i;
- struct breakpoint *bp = dbp->bp;
-
- retval = dpm_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
- bp ? &bp->set : NULL);
- if (retval != ERROR_OK)
- goto done;
- }
- }
-
- /* enable/disable watchpoints */
- for (unsigned i = 0; i < dpm->nwp; i++) {
- struct dpm_wp *dwp = dpm->dwp + i;
- struct watchpoint *wp = dwp->wp;
-
- retval = dpm_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
- wp ? &wp->set : NULL);
- if (retval != ERROR_OK)
- goto done;
- }
-
- /* NOTE: writes to breakpoint and watchpoint registers might
- * be queued, and need (efficient/batched) flushing later.
- */
-
- if (cache->reg_list[0].size == 64)
- retval = arm_dpm_write_dirty_registers_64(dpm);
- else
- retval = arm_dpm_write_dirty_registers_32(dpm);
-
/* (void) */ dpm->finish(dpm);
done:
return retval;
/* register access setup */
arm->full_context = arm_dpm_full_context;
- arm->read_core_reg = arm->read_core_reg ? : arm_dpm_read_core_reg;
- arm->write_core_reg = arm->write_core_reg ? : arm_dpm_write_core_reg;
+ arm->read_core_reg = arm_dpm_read_core_reg;
+ arm->write_core_reg = arm_dpm_write_core_reg;
if (arm->core_cache != NULL) {
- if (arm->core_state == ARM_STATE_AARCH64) {
- cache = armv8_build_reg_cache(target);
- target->reg_cache = cache;
- } else {
- cache = arm_build_reg_cache(target, arm);
- *register_get_last_cache_p(&target->reg_cache) = cache;
- }
-
+ cache = arm_build_reg_cache(target, arm);
if (!cache)
return ERROR_FAIL;
+
+ *register_get_last_cache_p(&target->reg_cache) = cache;
}
/* coprocessor access setup */
target->type->add_watchpoint = dpm_add_watchpoint;
target->type->remove_watchpoint = dpm_remove_watchpoint;
-
- if (dpm->arm_reg_current == 0)
- dpm->arm_reg_current = arm_reg_current;
-
/* FIXME add vector catch support */
- if (arm->core_state == ARM_STATE_AARCH64) {
- dpm->nbp = 1 + ((dpm->didr >> 24) & 0xf);
- dpm->nwp = 1 + ((dpm->didr >> 28) & 0xf);
- } else {
- dpm->nbp = 1 + ((dpm->didr >> 12) & 0xf);
- dpm->nwp = 1 + ((dpm->didr >> 20) & 0xf);
- }
-
+ dpm->nbp = 1 + ((dpm->didr >> 24) & 0xf);
+ dpm->nwp = 1 + ((dpm->didr >> 28) & 0xf);
dpm->dbp = calloc(dpm->nbp, sizeof *dpm->dbp);
dpm->dwp = calloc(dpm->nwp, sizeof *dpm->dwp);
--- /dev/null
+/*
+ * Copyright (C) 2009 by David Brownell
+ *
+ * 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.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "arm.h"
+#include "armv8.h"
+#include "armv8_dpm.h"
+#include <jtag/jtag.h>
+#include "register.h"
+#include "breakpoints.h"
+#include "target_type.h"
+#include "armv8_opcodes.h"
+
+
+/**
+ * @file
+ * Implements various ARM DPM operations using architectural debug registers.
+ * These routines layer over core-specific communication methods to cope with
+ * implementation differences between cores like ARM1136 and Cortex-A8.
+ *
+ * The "Debug Programmers' Model" (DPM) for ARMv6 and ARMv7 is defined by
+ * Part C (Debug Architecture) of the ARM Architecture Reference Manual,
+ * ARMv7-A and ARMv7-R edition (ARM DDI 0406B). In OpenOCD, DPM operations
+ * are abstracted through internal programming interfaces to share code and
+ * to minimize needless differences in debug behavior between cores.
+ */
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Coprocessor support
+ */
+
+/* Read coprocessor */
+static int dpmv8_mrc(struct target *target, int cpnum,
+ uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
+ uint32_t *value)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ LOG_DEBUG("MRC p%d, %d, r0, c%d, c%d, %d", cpnum,
+ (int) op1, (int) CRn,
+ (int) CRm, (int) op2);
+
+ /* read coprocessor register into R0; return via DCC */
+ retval = dpm->instr_read_data_r0(dpm,
+ T32_FMTITR(ARMV4_5_MRC(cpnum, op1, 0, CRn, CRm, op2)),
+ value);
+
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+static int dpmv8_mcr(struct target *target, int cpnum,
+ uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
+ uint32_t value)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ LOG_DEBUG("MCR p%d, %d, r0, c%d, c%d, %d", cpnum,
+ (int) op1, (int) CRn,
+ (int) CRm, (int) op2);
+
+ /* read DCC into r0; then write coprocessor register from R0 */
+ retval = dpm->instr_write_data_r0(dpm,
+ T32_FMTITR(ARMV4_5_MCR(cpnum, op1, 0, CRn, CRm, op2)),
+ value);
+
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+static int dpmv8_mrs(struct target *target, uint32_t op0,
+ uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
+ uint32_t *value)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval;
+ uint32_t op_code;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+ op_code = ((op0 & 0x3) << 19 | (op1 & 0x7) << 16 | (CRn & 0xF) << 12 |\
+ (CRm & 0xF) << 8 | (op2 & 0x7) << 5);
+ op_code >>= 5;
+ LOG_DEBUG("MRS p%d, %d, r0, c%d, c%d, %d", (int)op0,
+ (int) op1, (int) CRn,
+ (int) CRm, (int) op2);
+ /* read coprocessor register into R0; return via DCC */
+ retval = dpm->instr_read_data_r0(dpm,
+ ARMV8_MRS(op_code, 0),
+ value);
+
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+static int dpmv8_msr(struct target *target, uint32_t op0,
+ uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
+ uint32_t value)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval;
+ uint32_t op_code;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ op_code = ((op0 & 0x3) << 19 | (op1 & 0x7) << 16 | (CRn & 0xF) << 12 |\
+ (CRm & 0xF) << 8 | (op2 & 0x7) << 5);
+ op_code >>= 5;
+ LOG_DEBUG("MSR p%d, %d, r0, c%d, c%d, %d", (int)op0,
+ (int) op1, (int) CRn,
+ (int) CRm, (int) op2);
+
+ /* read DCC into r0; then write coprocessor register from R0 */
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV8_MSR_GP(op_code, 0),
+ value);
+
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Register access utilities
+ */
+
+/* Toggles between recorded core mode (USR, SVC, etc) and a temporary one.
+ * Routines *must* restore the original mode before returning!!
+ */
+int dpmv8_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
+{
+ int retval;
+ uint32_t cpsr;
+
+ /* restore previous mode */
+ if (mode == ARM_MODE_ANY)
+ cpsr = buf_get_u32(dpm->arm->cpsr->value, 0, 32);
+
+ /* else force to the specified mode */
+ else
+ cpsr = mode >> 4;
+
+ switch ((cpsr & 0xC) >> 2) {
+ case SYSTEM_CUREL_EL1:
+ retval = dpm->instr_execute(dpm, ARMV8_DCPS1(11));
+ if (retval != ERROR_OK)
+ return retval;
+ break;
+ case SYSTEM_CUREL_EL2:
+ retval = dpm->instr_execute(dpm, ARMV8_DCPS2(11));
+ if (retval != ERROR_OK)
+ return retval;
+ break;
+ break;
+ case SYSTEM_CUREL_EL3:
+ retval = dpm->instr_execute(dpm, ARMV8_DCPS3(11));
+ if (retval != ERROR_OK)
+ return retval;
+ break;
+ break;
+ default:
+ LOG_DEBUG("unknow mode 0x%x", (unsigned) ((cpsr & 0xC) >> 2));
+ break;
+ }
+
+
+ retval = dpm->instr_write_data_r0(dpm, ARMV8_MSR_DSPSR(0), cpsr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (dpm->instr_cpsr_sync)
+ retval = dpm->instr_cpsr_sync(dpm);
+
+ return retval;
+}
+
+/* just read the register -- rely on the core mode being right */
+static int dpmv8_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+{
+ uint32_t value;
+ uint64_t value_64;
+ int retval = ERROR_FAIL;
+
+ switch (regnum) {
+ case 0 ... 30:
+ retval = dpm->instr_read_data_dcc_64(dpm,
+ ARMV8_MSR_GP(SYSTEM_DBG_DBGDTR_EL0, regnum),
+ &value_64);
+ break;
+ case 31:
+ retval = dpm->instr_read_data_r0_64(dpm,
+ ARMV8_MOVFSP_64(0),
+ &value_64);
+ break;
+ case 32:
+ retval = dpm->instr_read_data_r0_64(dpm,
+ ARMV8_MRS_DLR(0),
+ &value_64);
+ break;
+ case 33:
+ retval = dpm->instr_read_data_r0(dpm,
+ ARMV8_MRS_DSPSR(0),
+ &value);
+ default:
+ LOG_DEBUG("READ: %s fail", r->name);
+ break;
+ }
+
+ if (retval == ERROR_OK) {
+ r->valid = true;
+ r->dirty = false;
+ buf_set_u64(r->value, 0, 32, value_64);
+ if (r->size == 64)
+ LOG_DEBUG("READ: %s, %16.8llx", r->name, (unsigned long long) value_64);
+ else
+ LOG_DEBUG("READ: %s, %8.8x", r->name, (unsigned) value);
+ }
+ return retval;
+}
+
+/* just write the register -- rely on the core mode being right */
+static int dpmv8_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+{
+ int retval = ERROR_FAIL;
+ uint32_t value = 0xFFFFFFFF;
+ uint64_t value_64 = 0xFFFFFFFFFFFFFFFF;
+
+ switch (regnum) {
+ case 0 ... 30:
+ value_64 = buf_get_u64(r->value, 0, 64);
+ retval = dpm->instr_write_data_dcc_64(dpm,
+ ARMV8_MRS(SYSTEM_DBG_DBGDTR_EL0, regnum),
+ value_64);
+ break;
+ case 31:
+ value_64 = buf_get_u64(r->value, 0, 64);
+ retval = dpm->instr_write_data_r0_64(dpm,
+ ARMV8_MOVTSP_64(0),
+ value_64);
+ break;
+ case 32:
+ value_64 = buf_get_u64(r->value, 0, 64);
+ retval = dpm->instr_write_data_r0_64(dpm,
+ ARMV8_MSR_DLR(0),
+ value_64);
+ break;
+ case 33:
+ value = buf_get_u32(r->value, 0, 32);
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV8_MSR_DSPSR(0),
+ value);
+ default:
+ LOG_DEBUG("write: %s fail", r->name);
+ break;
+ }
+
+
+ if (retval == ERROR_OK) {
+ r->dirty = false;
+ if (r->size == 64)
+ LOG_DEBUG("WRITE: %s, %16.8llx", r->name, (unsigned long long) value_64);
+ else
+ LOG_DEBUG("WRITE: %s, %8.8x", r->name, (unsigned) value);
+ }
+
+ return retval;
+}
+
+/**
+ * Read basic registers of the the current context: R0 to R15, and CPSR;
+ * sets the core mode (such as USR or IRQ) and state (such as ARM or Thumb).
+ * In normal operation this is called on entry to halting debug state,
+ * possibly after some other operations supporting restore of debug state
+ * or making sure the CPU is fully idle (drain write buffer, etc).
+ */
+int armv8_dpm_read_current_registers(struct arm_dpm *dpm)
+{
+ struct arm *arm = dpm->arm;
+ uint32_t cpsr;
+ int retval;
+ struct reg *r;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* read R0 first (it's used for scratch), then CPSR */
+ r = arm->core_cache->reg_list + 0;
+ if (!r->valid) {
+ retval = dpmv8_read_reg(dpm, r, 0);
+ if (retval != ERROR_OK)
+ goto fail;
+ }
+ r->dirty = true;
+ /* read cpsr to r0 and get it back */
+ retval = dpm->instr_read_data_r0(dpm, ARMV8_MRS_DSPSR(0), &cpsr);
+ if (retval != ERROR_OK)
+ goto fail;
+
+ /* update core mode and state, plus shadow mapping for R8..R14 */
+ armv8_set_cpsr(arm, cpsr);
+
+ /* REVISIT we can probably avoid reading R1..R14, saving time... */
+ for (unsigned i = 1; i < arm->core_cache->num_regs ; i++) {
+ r = armv8_reg_current(arm, i);
+ if (r->valid)
+ continue;
+
+ retval = dpmv8_read_reg(dpm, r, i);
+ if (retval != ERROR_OK)
+ goto fail;
+ }
+
+ /* NOTE: SPSR ignored (if it's even relevant). */
+
+ /* REVISIT the debugger can trigger various exceptions. See the
+ * ARMv7A architecture spec, section C5.7, for more info about
+ * what defenses are needed; v6 debug has the most issues.
+ */
+
+fail:
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+/* Avoid needless I/O ... leave breakpoints and watchpoints alone
+ * unless they're removed, or need updating because of single-stepping
+ * or running debugger code.
+ */
+static int dpmv8_maybe_update_bpwp(struct arm_dpm *dpm, bool bpwp,
+ struct dpm_bpwp *xp, int *set_p)
+{
+ int retval = ERROR_OK;
+ bool disable;
+
+ if (!set_p) {
+ if (!xp->dirty)
+ goto done;
+ xp->dirty = false;
+ /* removed or startup; we must disable it */
+ disable = true;
+ } else if (bpwp) {
+ if (!xp->dirty)
+ goto done;
+ /* disabled, but we must set it */
+ xp->dirty = disable = false;
+ *set_p = true;
+ } else {
+ if (!*set_p)
+ goto done;
+ /* set, but we must temporarily disable it */
+ xp->dirty = disable = true;
+ *set_p = false;
+ }
+
+ if (disable)
+ retval = dpm->bpwp_disable(dpm, xp->number);
+ else
+ retval = dpm->bpwp_enable(dpm, xp->number,
+ xp->address, xp->control);
+
+ if (retval != ERROR_OK)
+ LOG_ERROR("%s: can't %s HW %spoint %d",
+ disable ? "disable" : "enable",
+ target_name(dpm->arm->target),
+ (xp->number < 16) ? "break" : "watch",
+ xp->number & 0xf);
+done:
+ return retval;
+}
+
+static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp);
+
+/**
+ * Writes all modified core registers for all processor modes. In normal
+ * operation this is called on exit from halting debug state.
+ *
+ * @param dpm: represents the processor
+ * @param bpwp: true ensures breakpoints and watchpoints are set,
+ * false ensures they are cleared
+ */
+int armv8_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
+{
+ struct arm *arm = dpm->arm;
+ struct reg_cache *cache = arm->core_cache;
+ int retval;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ goto done;
+
+ /* If we're managing hardware breakpoints for this core, enable
+ * or disable them as requested.
+ *
+ * REVISIT We don't yet manage them for ANY cores. Eventually
+ * we should be able to assume we handle them; but until then,
+ * cope with the hand-crafted breakpoint code.
+ */
+ if (arm->target->type->add_breakpoint == dpmv8_add_breakpoint) {
+ for (unsigned i = 0; i < dpm->nbp; i++) {
+ struct dpm_bp *dbp = dpm->dbp + i;
+ struct breakpoint *bp = dbp->bp;
+
+ retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dbp->bpwp,
+ bp ? &bp->set : NULL);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+ }
+
+ /* enable/disable watchpoints */
+ for (unsigned i = 0; i < dpm->nwp; i++) {
+ struct dpm_wp *dwp = dpm->dwp + i;
+ struct watchpoint *wp = dwp->wp;
+
+ retval = dpmv8_maybe_update_bpwp(dpm, bpwp, &dwp->bpwp,
+ wp ? &wp->set : NULL);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+
+ /* NOTE: writes to breakpoint and watchpoint registers might
+ * be queued, and need (efficient/batched) flushing later.
+ */
+
+ /* Scan the registers until we find one that's both dirty and
+ * eligible for flushing. Flush that and everything else that
+ * shares the same core mode setting. Typically this won't
+ * actually find anything to do...
+ */
+
+ /* check everything except our scratch register R0 */
+ for (unsigned i = 1; i < cache->num_regs; i++) {
+ struct arm_reg *r;
+ unsigned regnum;
+
+ /* also skip PC, CPSR, and non-dirty */
+ if (i == (arm->core_cache->num_regs - 2))
+ continue;
+ if (arm->cpsr == cache->reg_list + i)
+ continue;
+ if (!cache->reg_list[i].dirty)
+ continue;
+
+ r = cache->reg_list[i].arch_info;
+ regnum = r->num;
+
+ retval = dpmv8_write_reg(dpm,
+ &cache->reg_list[i],
+ regnum);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+
+
+ /* Restore original CPSR ... assuming either that we changed it,
+ * or it's dirty. Must write PC to ensure the return address is
+ * defined, and must not write it before CPSR.
+ */
+ retval = dpmv8_modeswitch(dpm, ARM_MODE_ANY);
+ if (retval != ERROR_OK)
+ goto done;
+ arm->cpsr->dirty = false;
+
+ retval = dpmv8_write_reg(dpm, arm->pc, (arm->core_cache->num_regs - 2));
+ if (retval != ERROR_OK)
+ goto done;
+ arm->pc->dirty = false;
+
+ /* flush R0 -- it's *very* dirty by now */
+ retval = dpmv8_write_reg(dpm, &cache->reg_list[0], 0);
+ if (retval != ERROR_OK)
+ goto done;
+ cache->reg_list[0].dirty = false;
+
+ /* (void) */ dpm->finish(dpm);
+done:
+ return retval;
+}
+
+/*
+ * Standard ARM register accessors ... there are three methods
+ * in "struct arm", to support individual read/write and bulk read
+ * of registers.
+ */
+
+static int armv8_dpm_read_core_reg(struct target *target, struct reg *r,
+ int regnum, enum arm_mode mode)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = target_to_arm(target)->dpm;
+ int retval;
+ int max = arm->core_cache->num_regs;
+
+ if (regnum < 0 || regnum > max)
+ return ERROR_COMMAND_SYNTAX_ERROR;
+
+ /* REVISIT what happens if we try to read SPSR in a core mode
+ * which has no such register?
+ */
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = dpmv8_read_reg(dpm, r, regnum);
+ if (retval != ERROR_OK)
+ goto fail;
+
+fail:
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+static int armv8_dpm_write_core_reg(struct target *target, struct reg *r,
+ int regnum, enum arm_mode mode, uint8_t *value)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = target_to_arm(target)->dpm;
+ int retval;
+ int max = arm->core_cache->num_regs;
+
+ if (regnum < 0 || regnum > max)
+ return ERROR_COMMAND_SYNTAX_ERROR;
+
+ /* REVISIT what happens if we try to write SPSR in a core mode
+ * which has no such register?
+ */
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = dpmv8_write_reg(dpm, r, regnum);
+ /* always clean up, regardless of error */
+
+ /* (void) */ dpm->finish(dpm);
+ return retval;
+}
+
+static int armv8_dpm_full_context(struct target *target)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ struct reg_cache *cache = arm->core_cache;
+ int retval;
+ bool did_read;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ goto done;
+
+ do {
+ enum arm_mode mode = ARM_MODE_ANY;
+
+ did_read = false;
+
+ /* We "know" arm_dpm_read_current_registers() was called so
+ * the unmapped registers (R0..R7, PC, AND CPSR) and some
+ * view of R8..R14 are current. We also "know" oddities of
+ * register mapping: special cases for R8..R12 and SPSR.
+ *
+ * Pick some mode with unread registers and read them all.
+ * Repeat until done.
+ */
+ for (unsigned i = 0; i < cache->num_regs; i++) {
+ struct arm_reg *r;
+
+ if (cache->reg_list[i].valid)
+ continue;
+ r = cache->reg_list[i].arch_info;
+
+ /* may need to pick a mode and set CPSR */
+ if (!did_read) {
+ did_read = true;
+ mode = r->mode;
+
+ /* For regular (ARM_MODE_ANY) R8..R12
+ * in case we've entered debug state
+ * in FIQ mode we need to patch mode.
+ */
+ if (mode != ARM_MODE_ANY)
+ retval = dpmv8_modeswitch(dpm, mode);
+ else
+ retval = dpmv8_modeswitch(dpm, ARM_MODE_USR);
+
+ if (retval != ERROR_OK)
+ goto done;
+ }
+ if (r->mode != mode)
+ continue;
+
+ /* CPSR was read, so "R16" must mean SPSR */
+ retval = dpmv8_read_reg(dpm,
+ &cache->reg_list[i],
+ (r->num == 16) ? 17 : r->num);
+ if (retval != ERROR_OK)
+ goto done;
+ }
+
+ } while (did_read);
+
+ retval = dpmv8_modeswitch(dpm, ARM_MODE_ANY);
+ /* (void) */ dpm->finish(dpm);
+done:
+ return retval;
+}
+
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Breakpoint and Watchpoint support.
+ *
+ * Hardware {break,watch}points are usually left active, to minimize
+ * debug entry/exit costs. When they are set or cleared, it's done in
+ * batches. Also, DPM-conformant hardware can update debug registers
+ * regardless of whether the CPU is running or halted ... though that
+ * fact isn't currently leveraged.
+ */
+
+static int dpmv8_bpwp_setup(struct arm_dpm *dpm, struct dpm_bpwp *xp,
+ uint32_t addr, uint32_t length)
+{
+ uint32_t control;
+
+ control = (1 << 0) /* enable */
+ | (3 << 1); /* both user and privileged access */
+
+ /* Match 1, 2, or all 4 byte addresses in this word.
+ *
+ * FIXME: v7 hardware allows lengths up to 2 GB for BP and WP.
+ * Support larger length, when addr is suitably aligned. In
+ * particular, allow watchpoints on 8 byte "double" values.
+ *
+ * REVISIT allow watchpoints on unaligned 2-bit values; and on
+ * v7 hardware, unaligned 4-byte ones too.
+ */
+ switch (length) {
+ case 1:
+ control |= (1 << (addr & 3)) << 5;
+ break;
+ case 2:
+ /* require 2-byte alignment */
+ if (!(addr & 1)) {
+ control |= (3 << (addr & 2)) << 5;
+ break;
+ }
+ /* FALL THROUGH */
+ case 4:
+ /* require 4-byte alignment */
+ if (!(addr & 3)) {
+ control |= 0xf << 5;
+ break;
+ }
+ /* FALL THROUGH */
+ default:
+ LOG_ERROR("unsupported {break,watch}point length/alignment");
+ return ERROR_COMMAND_SYNTAX_ERROR;
+ }
+
+ /* other shared control bits:
+ * bits 15:14 == 0 ... both secure and nonsecure states (v6.1+ only)
+ * bit 20 == 0 ... not linked to a context ID
+ * bit 28:24 == 0 ... not ignoring N LSBs (v7 only)
+ */
+
+ xp->address = addr & ~3;
+ xp->control = control;
+ xp->dirty = true;
+
+ LOG_DEBUG("BPWP: addr %8.8" PRIx32 ", control %" PRIx32 ", number %d",
+ xp->address, control, xp->number);
+
+ /* hardware is updated in write_dirty_registers() */
+ return ERROR_OK;
+}
+
+static int dpmv8_add_breakpoint(struct target *target, struct breakpoint *bp)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+
+ if (bp->length < 2)
+ return ERROR_COMMAND_SYNTAX_ERROR;
+ if (!dpm->bpwp_enable)
+ return retval;
+
+ /* FIXME we need a generic solution for software breakpoints. */
+ if (bp->type == BKPT_SOFT)
+ LOG_DEBUG("using HW bkpt, not SW...");
+
+ for (unsigned i = 0; i < dpm->nbp; i++) {
+ if (!dpm->dbp[i].bp) {
+ retval = dpmv8_bpwp_setup(dpm, &dpm->dbp[i].bpwp,
+ bp->address, bp->length);
+ if (retval == ERROR_OK)
+ dpm->dbp[i].bp = bp;
+ break;
+ }
+ }
+
+ return retval;
+}
+
+static int dpmv8_remove_breakpoint(struct target *target, struct breakpoint *bp)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval = ERROR_COMMAND_SYNTAX_ERROR;
+
+ for (unsigned i = 0; i < dpm->nbp; i++) {
+ if (dpm->dbp[i].bp == bp) {
+ dpm->dbp[i].bp = NULL;
+ dpm->dbp[i].bpwp.dirty = true;
+
+ /* hardware is updated in write_dirty_registers() */
+ retval = ERROR_OK;
+ break;
+ }
+ }
+
+ return retval;
+}
+
+static int dpmv8_watchpoint_setup(struct arm_dpm *dpm, unsigned index_t,
+ struct watchpoint *wp)
+{
+ int retval;
+ struct dpm_wp *dwp = dpm->dwp + index_t;
+ uint32_t control;
+
+ /* this hardware doesn't support data value matching or masking */
+ if (wp->value || wp->mask != ~(uint32_t)0) {
+ LOG_DEBUG("watchpoint values and masking not supported");
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+ }
+
+ retval = dpmv8_bpwp_setup(dpm, &dwp->bpwp, wp->address, wp->length);
+ if (retval != ERROR_OK)
+ return retval;
+
+ control = dwp->bpwp.control;
+ switch (wp->rw) {
+ case WPT_READ:
+ control |= 1 << 3;
+ break;
+ case WPT_WRITE:
+ control |= 2 << 3;
+ break;
+ case WPT_ACCESS:
+ control |= 3 << 3;
+ break;
+ }
+ dwp->bpwp.control = control;
+
+ dpm->dwp[index_t].wp = wp;
+
+ return retval;
+}
+
+static int dpmv8_add_watchpoint(struct target *target, struct watchpoint *wp)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval = ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+
+ if (dpm->bpwp_enable) {
+ for (unsigned i = 0; i < dpm->nwp; i++) {
+ if (!dpm->dwp[i].wp) {
+ retval = dpmv8_watchpoint_setup(dpm, i, wp);
+ break;
+ }
+ }
+ }
+
+ return retval;
+}
+
+static int dpmv8_remove_watchpoint(struct target *target, struct watchpoint *wp)
+{
+ struct arm *arm = target_to_arm(target);
+ struct arm_dpm *dpm = arm->dpm;
+ int retval = ERROR_COMMAND_SYNTAX_ERROR;
+
+ for (unsigned i = 0; i < dpm->nwp; i++) {
+ if (dpm->dwp[i].wp == wp) {
+ dpm->dwp[i].wp = NULL;
+ dpm->dwp[i].bpwp.dirty = true;
+
+ /* hardware is updated in write_dirty_registers() */
+ retval = ERROR_OK;
+ break;
+ }
+ }
+
+ return retval;
+}
+
+void armv8_dpm_report_wfar(struct arm_dpm *dpm, uint64_t addr)
+{
+ switch (dpm->arm->core_state) {
+ case ARM_STATE_ARM:
+ case ARM_STATE_AARCH64:
+ addr -= 8;
+ break;
+ case ARM_STATE_THUMB:
+ case ARM_STATE_THUMB_EE:
+ addr -= 4;
+ break;
+ case ARM_STATE_JAZELLE:
+ /* ?? */
+ break;
+ default:
+ LOG_DEBUG("Unknow core_state");
+ break;
+ }
+ dpm->wp_pc = addr;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Other debug and support utilities
+ */
+
+void armv8_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dscr)
+{
+ struct target *target = dpm->arm->target;
+
+ dpm->dscr = dscr;
+
+ /* Examine debug reason */
+ switch (DSCR_ENTRY(dscr)) {
+ /* FALL THROUGH -- assume a v6 core in abort mode */
+ case DSCRV8_ENTRY_HLT: /* HALT request from debugger */
+ case DSCRV8_ENTRY_EXT_DEBUG: /* EDBGRQ */
+ target->debug_reason = DBG_REASON_DBGRQ;
+ break;
+ case DSCRV8_ENTRY_HALT_STEP_EXECLU: /* HALT step */
+ case DSCRV8_ENTRY_BKPT: /* SW BKPT */
+ case DSCRV8_ENTRY_RESET_CATCH: /* Reset catch */
+ case DSCRV8_ENTRY_OS_UNLOCK: /*OS unlock catch*/
+ case DSCRV8_ENTRY_EXCEPTION_CATCH: /*exception catch*/
+ case DSCRV8_ENTRY_HALT_STEP_NORMAL: /* Halt step*/
+ case DSCRV8_ENTRY_SW_ACCESS_DBG: /*SW access dbg register*/
+ target->debug_reason = DBG_REASON_BREAKPOINT;
+ break;
+ case DSCRV8_ENTRY_WATCHPOINT: /* asynch watchpoint */
+ target->debug_reason = DBG_REASON_WATCHPOINT;
+ break;
+ default:
+ target->debug_reason = DBG_REASON_UNDEFINED;
+ break;
+ }
+
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Setup and management support.
+ */
+
+/**
+ * Hooks up this DPM to its associated target; call only once.
+ * Initially this only covers the register cache.
+ *
+ * Oh, and watchpoints. Yeah.
+ */
+int armv8_dpm_setup(struct arm_dpm *dpm)
+{
+ struct arm *arm = dpm->arm;
+ struct target *target = arm->target;
+ struct reg_cache *cache;
+ arm->dpm = dpm;
+
+ /* register access setup */
+ arm->full_context = armv8_dpm_full_context;
+ arm->read_core_reg = armv8_dpm_read_core_reg;
+ arm->write_core_reg = armv8_dpm_write_core_reg;
+
+ cache = armv8_build_reg_cache(target);
+ if (!cache)
+ return ERROR_FAIL;
+
+ /* coprocessor access setup */
+ arm->mrc = dpmv8_mrc;
+ arm->mcr = dpmv8_mcr;
+ arm->mrs = dpmv8_mrs;
+ arm->msr = dpmv8_msr;
+ /* breakpoint setup -- optional until it works everywhere */
+ if (!target->type->add_breakpoint) {
+ target->type->add_breakpoint = dpmv8_add_breakpoint;
+ target->type->remove_breakpoint = dpmv8_remove_breakpoint;
+ }
+
+ /* watchpoint setup */
+ target->type->add_watchpoint = dpmv8_add_watchpoint;
+ target->type->remove_watchpoint = dpmv8_remove_watchpoint;
+
+ /* FIXME add vector catch support */
+
+ dpm->nbp = 1 + ((dpm->didr >> 12) & 0xf);
+ dpm->dbp = calloc(dpm->nbp, sizeof *dpm->dbp);
+
+ dpm->nwp = 1 + ((dpm->didr >> 20) & 0xf);
+ dpm->dwp = calloc(dpm->nwp, sizeof *dpm->dwp);
+
+ if (!dpm->dbp || !dpm->dwp) {
+ free(dpm->dbp);
+ free(dpm->dwp);
+ return ERROR_FAIL;
+ }
+
+ LOG_INFO("%s: hardware has %d breakpoints, %d watchpoints",
+ target_name(target), dpm->nbp, dpm->nwp);
+
+ /* REVISIT ... and some of those breakpoints could match
+ * execution context IDs...
+ */
+
+ return ERROR_OK;
+}
+
+/**
+ * Reinitializes DPM state at the beginning of a new debug session
+ * or after a reset which may have affected the debug module.
+ */
+int armv8_dpm_initialize(struct arm_dpm *dpm)
+{
+ /* Disable all breakpoints and watchpoints at startup. */
+ if (dpm->bpwp_disable) {
+ unsigned i;
+
+ for (i = 0; i < dpm->nbp; i++) {
+ dpm->dbp[i].bpwp.number = i;
+ (void) dpm->bpwp_disable(dpm, i);
+ }
+ for (i = 0; i < dpm->nwp; i++) {
+ dpm->dwp[i].bpwp.number = 16 + i;
+ (void) dpm->bpwp_disable(dpm, 16 + i);
+ }
+ } else
+ LOG_WARNING("%s: can't disable breakpoints and watchpoints",
+ target_name(dpm->arm->target));
+
+ return ERROR_OK;
+}
projects / openocd / commitdiff