X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Ftarget%2Farm_dpm.c;h=f5dd22d8b31677a57f8c8bb414e501c65e918443;hp=127f87b53648c403f9ea30bdced193482eacedc5;hb=8bb1998e6afe8488c44828e69b5b0d5092f39545;hpb=563d937c3c6a7080998baa2313d66ae184b820ac
diff --git a/src/target/arm_dpm.c b/src/target/arm_dpm.c
index 127f87b536..f5dd22d8b3 100644
--- a/src/target/arm_dpm.c
+++ b/src/target/arm_dpm.c
@@ -12,19 +12,21 @@
* 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.
+ * along with this program. If not, see .
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include "armv4_5.h" /* REVISIT to become arm.h */
+#include "arm.h"
#include "arm_dpm.h"
-#include "jtag.h"
+#include "armv8_dpm.h"
+#include
#include "register.h"
+#include "breakpoints.h"
+#include "target_type.h"
+#include "arm_opcodes.h"
/**
@@ -32,16 +34,24 @@
* 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 dpm_mrc(struct target *target, int cpnum,
- uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
- uint32_t *value)
+ 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;
@@ -51,7 +61,9 @@ static int dpm_mrc(struct target *target, int cpnum,
if (retval != ERROR_OK)
return retval;
- LOG_DEBUG("MRC p%d, %d, r0, c%d, c%d, %d", cpnum, op1, CRn, CRm, op2);
+ 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,
@@ -63,8 +75,8 @@ static int dpm_mrc(struct target *target, int cpnum,
}
static int dpm_mcr(struct target *target, int cpnum,
- uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm,
- uint32_t value)
+ 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;
@@ -74,7 +86,9 @@ static int dpm_mcr(struct target *target, int cpnum,
if (retval != ERROR_OK)
return retval;
- LOG_DEBUG("MCR p%d, %d, r0, c%d, c%d, %d", cpnum, op1, CRn, CRm, op2);
+ 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,
@@ -85,6 +99,8 @@ static int dpm_mcr(struct target *target, int cpnum,
return retval;
}
+/*----------------------------------------------------------------------*/
+
/*
* Register access utilities
*/
@@ -92,13 +108,13 @@ static int dpm_mcr(struct target *target, int cpnum,
/* Toggles between recorded core mode (USR, SVC, etc) and a temporary one.
* Routines *must* restore the original mode before returning!!
*/
-static int dpm_modeswitch(struct arm_dpm *dpm, enum armv4_5_mode mode)
+int arm_dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode)
{
int retval;
uint32_t cpsr;
/* restore previous mode */
- if (mode == ARMV4_5_MODE_ANY)
+ if (mode == ARM_MODE_ANY)
cpsr = buf_get_u32(dpm->arm->cpsr->value, 0, 32);
/* else force to the specified mode */
@@ -106,6 +122,8 @@ static int dpm_modeswitch(struct arm_dpm *dpm, enum armv4_5_mode mode)
cpsr = mode;
retval = dpm->instr_write_data_r0(dpm, ARMV4_5_MSR_GP(0, 0xf, 0), cpsr);
+ if (retval != ERROR_OK)
+ return retval;
if (dpm->instr_cpsr_sync)
retval = dpm->instr_cpsr_sync(dpm);
@@ -113,51 +131,101 @@ static int dpm_modeswitch(struct arm_dpm *dpm, enum armv4_5_mode mode)
return retval;
}
+/* Read 64bit VFP registers */
+static int dpm_read_reg_u64(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+{
+ int retval = ERROR_FAIL;
+ uint32_t value_r0, value_r1;
+
+ switch (regnum) {
+ case ARM_VFP_V3_D0 ... ARM_VFP_V3_D31:
+ /* move from double word register to r0:r1: "vmov r0, r1, vm"
+ * then read r0 via dcc
+ */
+ retval = dpm->instr_read_data_r0(dpm,
+ ARMV4_5_VMOV(1, 1, 0, ((regnum - ARM_VFP_V3_D0) >> 4),
+ ((regnum - ARM_VFP_V3_D0) & 0xf)), &value_r0);
+ if (retval != ERROR_OK)
+ break;
+
+ /* read r1 via dcc */
+ retval = dpm->instr_read_data_dcc(dpm,
+ ARMV4_5_MCR(14, 0, 1, 0, 5, 0),
+ &value_r1);
+ break;
+ default:
+
+ break;
+ }
+
+ if (retval == ERROR_OK) {
+ buf_set_u32(r->value, 0, 32, value_r0);
+ buf_set_u32(r->value + 4, 0, 32, value_r1);
+ r->valid = true;
+ r->dirty = false;
+ LOG_DEBUG("READ: %s, %8.8x, %8.8x", r->name,
+ (unsigned) value_r0, (unsigned) value_r1);
+ }
+
+ 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)
+int arm_dpm_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
{
uint32_t value;
int retval;
switch (regnum) {
- case 0 ... 14:
- /* return via DCC: "MCR p14, 0, Rnum, c0, c5, 0" */
- retval = dpm->instr_read_data_dcc(dpm,
+ case 0 ... 14:
+ /* return via DCC: "MCR p14, 0, Rnum, c0, c5, 0" */
+ retval = dpm->instr_read_data_dcc(dpm,
ARMV4_5_MCR(14, 0, regnum, 0, 5, 0),
&value);
- break;
- case 15: /* PC */
- /* "MOV r0, pc"; then return via DCC */
- retval = dpm->instr_read_data_r0(dpm, 0xe1a0000f, &value);
-
- /* NOTE: this seems like a slightly awkward place to update
- * this value ... but if the PC gets written (the only way
- * to change what we compute), the arch spec says subsequent
- * reads return values which are "unpredictable". So this
- * is always right except in those broken-by-intent cases.
- */
- switch (dpm->arm->core_state) {
- case ARMV4_5_STATE_ARM:
- value -= 8;
break;
- case ARMV4_5_STATE_THUMB:
- case ARM_STATE_THUMB_EE:
- value -= 4;
+ case 15:/* PC
+ * "MOV r0, pc"; then return via DCC */
+ retval = dpm->instr_read_data_r0(dpm, 0xe1a0000f, &value);
+
+ /* NOTE: this seems like a slightly awkward place to update
+ * this value ... but if the PC gets written (the only way
+ * to change what we compute), the arch spec says subsequent
+ * reads return values which are "unpredictable". So this
+ * is always right except in those broken-by-intent cases.
+ */
+ switch (dpm->arm->core_state) {
+ case ARM_STATE_ARM:
+ value -= 8;
+ break;
+ case ARM_STATE_THUMB:
+ case ARM_STATE_THUMB_EE:
+ value -= 4;
+ break;
+ case ARM_STATE_JAZELLE:
+ /* core-specific ... ? */
+ LOG_WARNING("Jazelle PC adjustment unknown");
+ break;
+ default:
+ LOG_WARNING("unknow core state");
+ break;
+ }
break;
- case ARMV4_5_STATE_JAZELLE:
- /* core-specific ... ? */
- LOG_WARNING("Jazelle PC adjustment unknown");
+ case ARM_VFP_V3_D0 ... ARM_VFP_V3_D31:
+ return dpm_read_reg_u64(dpm, r, regnum);
break;
- }
- break;
- default:
- /* 16: "MRS r0, CPSR"; then return via DCC
- * 17: "MRS r0, SPSR"; then return via DCC
- */
- retval = dpm->instr_read_data_r0(dpm,
+ case ARM_VFP_V3_FPSCR:
+ /* "VMRS r0, FPSCR"; then return via DCC */
+ retval = dpm->instr_read_data_r0(dpm,
+ ARMV4_5_VMRS(0), &value);
+ break;
+ default:
+ /* 16: "MRS r0, CPSR"; then return via DCC
+ * 17: "MRS r0, SPSR"; then return via DCC
+ */
+ retval = dpm->instr_read_data_r0(dpm,
ARMV4_5_MRS(0, regnum & 1),
&value);
- break;
+ break;
}
if (retval == ERROR_OK) {
@@ -170,6 +238,43 @@ static int dpm_read_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
return retval;
}
+/* Write 64bit VFP registers */
+static int dpm_write_reg_u64(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
+{
+ int retval = ERROR_FAIL;
+ uint32_t value_r0 = buf_get_u32(r->value, 0, 32);
+ uint32_t value_r1 = buf_get_u32(r->value + 4, 0, 32);
+
+ switch (regnum) {
+ case ARM_VFP_V3_D0 ... ARM_VFP_V3_D31:
+ /* write value_r1 to r1 via dcc */
+ retval = dpm->instr_write_data_dcc(dpm,
+ ARMV4_5_MRC(14, 0, 1, 0, 5, 0),
+ value_r1);
+ if (retval != ERROR_OK)
+ break;
+
+ /* write value_r0 to r0 via dcc then,
+ * move to double word register from r0:r1: "vmov vm, r0, r1"
+ */
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV4_5_VMOV(0, 1, 0, ((regnum - ARM_VFP_V3_D0) >> 4),
+ ((regnum - ARM_VFP_V3_D0) & 0xf)), value_r0);
+ break;
+ default:
+
+ break;
+ }
+
+ if (retval == ERROR_OK) {
+ r->dirty = false;
+ LOG_DEBUG("WRITE: %s, %8.8x, %8.8x", r->name,
+ (unsigned) value_r0, (unsigned) value_r1);
+ }
+
+ 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)
{
@@ -177,28 +282,38 @@ static int dpm_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
uint32_t value = buf_get_u32(r->value, 0, 32);
switch (regnum) {
- case 0 ... 14:
- /* load register from DCC: "MCR p14, 0, Rnum, c0, c5, 0" */
- retval = dpm->instr_write_data_dcc(dpm,
+ case 0 ... 14:
+ /* load register from DCC: "MRC p14, 0, Rnum, c0, c5, 0" */
+ retval = dpm->instr_write_data_dcc(dpm,
ARMV4_5_MRC(14, 0, regnum, 0, 5, 0),
value);
- break;
- case 15: /* PC */
- /* read r0 from DCC; then "MOV pc, r0" */
- retval = dpm->instr_write_data_r0(dpm, 0xe1a0f000, value);
- break;
- default:
- /* 16: read r0 from DCC, then "MSR r0, CPSR_cxsf"
- * 17: read r0 from DCC, then "MSR r0, SPSR_cxsf"
- */
- retval = dpm->instr_write_data_r0(dpm,
+ break;
+ case 15:/* PC
+ * read r0 from DCC; then "MOV pc, r0" */
+ retval = dpm->instr_write_data_r0(dpm, 0xe1a0f000, value);
+ break;
+ case ARM_VFP_V3_D0 ... ARM_VFP_V3_D31:
+ return dpm_write_reg_u64(dpm, r, regnum);
+ break;
+ case ARM_VFP_V3_FPSCR:
+ /* move to r0 from DCC, then "VMSR FPSCR, r0" */
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV4_5_VMSR(0), value);
+ break;
+ default:
+ /* 16: read r0 from DCC, then "MSR r0, CPSR_cxsf"
+ * 17: read r0 from DCC, then "MSR r0, SPSR_cxsf"
+ */
+ retval = dpm->instr_write_data_r0(dpm,
ARMV4_5_MSR_GP(0, 0xf, regnum & 1),
value);
+ if (retval != ERROR_OK)
+ return retval;
- if (regnum == 16 && dpm->instr_cpsr_sync)
- retval = dpm->instr_cpsr_sync(dpm);
+ if (regnum == 16 && dpm->instr_cpsr_sync)
+ retval = dpm->instr_cpsr_sync(dpm);
- break;
+ break;
}
if (retval == ERROR_OK) {
@@ -209,6 +324,18 @@ static int dpm_write_reg(struct arm_dpm *dpm, struct reg *r, unsigned regnum)
return retval;
}
+/**
+ * Write to program counter and switch the core state (arm/thumb) according to
+ * the address.
+ */
+static int dpm_write_pc_core_state(struct arm_dpm *dpm, struct reg *r)
+{
+ uint32_t value = buf_get_u32(r->value, 0, 32);
+
+ /* read r0 from DCC; then "BX r0" */
+ return dpm->instr_write_data_r0(dpm, ARMV4_5_BX(0), value);
+}
+
/**
* 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).
@@ -227,14 +354,16 @@ int arm_dpm_read_current_registers(struct arm_dpm *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 = dpm_read_reg(dpm, r, 0);
- if (retval != ERROR_OK)
- goto fail;
+ /* read R0 and R1 first (it's used for scratch), then CPSR */
+ for (unsigned i = 0; i < 2; i++) {
+ r = arm->core_cache->reg_list + i;
+ if (!r->valid) {
+ retval = arm_dpm_read_reg(dpm, r, i);
+ if (retval != ERROR_OK)
+ goto fail;
+ }
+ r->dirty = true;
}
- r->dirty = true;
retval = dpm->instr_read_data_r0(dpm, ARMV4_5_MRS(0, 0), &cpsr);
if (retval != ERROR_OK)
@@ -244,28 +373,85 @@ int arm_dpm_read_current_registers(struct arm_dpm *dpm)
arm_set_cpsr(arm, cpsr);
/* REVISIT we can probably avoid reading R1..R14, saving time... */
- for (unsigned i = 1; i < 16; i++) {
+ for (unsigned i = 2; i < 16; i++) {
r = arm_reg_current(arm, i);
if (r->valid)
continue;
- retval = dpm_read_reg(dpm, r, i);
+ retval = arm_dpm_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 dpm_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 dpm_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 arm_dpm_write_dirty_registers(struct arm_dpm *dpm)
+int arm_dpm_write_dirty_registers(struct arm_dpm *dpm, bool bpwp)
{
struct arm *arm = dpm->arm;
struct reg_cache *cache = arm->core_cache;
@@ -276,18 +462,52 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *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
* actually find anything to do...
*/
do {
- enum armv4_5_mode mode = ARMV4_5_MODE_ANY;
+ enum arm_mode mode = ARM_MODE_ANY;
did_write = false;
- /* check everything except our scratch register R0 */
- for (unsigned i = 1; i < cache->num_regs; i++) {
+ /* check everything except our scratch registers R0 and R1 */
+ for (unsigned i = 2; i < cache->num_regs; i++) {
struct arm_reg *r;
unsigned regnum;
@@ -304,7 +524,7 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *dpm)
/* may need to pick and set a mode */
if (!did_write) {
- enum armv4_5_mode tmode;
+ enum arm_mode tmode;
did_write = true;
mode = tmode = r->mode;
@@ -316,10 +536,10 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *dpm)
* we "know" core mode is accurate
* since we haven't changed it yet
*/
- if (arm->core_mode == ARMV4_5_MODE_FIQ
- && ARMV4_5_MODE_ANY
- != mode)
- tmode = ARMV4_5_MODE_USR;
+ if (arm->core_mode == ARM_MODE_FIQ
+ && ARM_MODE_ANY
+ != mode)
+ tmode = ARM_MODE_USR;
break;
case 16:
/* SPSR */
@@ -328,16 +548,20 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *dpm)
}
/* REVISIT error checks */
- if (tmode != ARMV4_5_MODE_ANY)
- retval = dpm_modeswitch(dpm, tmode);
+ if (tmode != ARM_MODE_ANY) {
+ retval = arm_dpm_modeswitch(dpm, tmode);
+ if (retval != ERROR_OK)
+ goto done;
+ }
}
if (r->mode != mode)
continue;
retval = dpm_write_reg(dpm,
- &cache->reg_list[i],
- regnum);
-
+ &cache->reg_list[i],
+ regnum);
+ if (retval != ERROR_OK)
+ goto done;
}
} while (did_write);
@@ -346,70 +570,100 @@ int arm_dpm_write_dirty_registers(struct arm_dpm *dpm)
* or it's dirty. Must write PC to ensure the return address is
* defined, and must not write it before CPSR.
*/
- retval = dpm_modeswitch(dpm, ARMV4_5_MODE_ANY);
+ retval = arm_dpm_modeswitch(dpm, ARM_MODE_ANY);
+ if (retval != ERROR_OK)
+ goto done;
arm->cpsr->dirty = false;
- retval = dpm_write_reg(dpm, &cache->reg_list[15], 15);
- cache->reg_list[15].dirty = false;
+ /* restore the PC, make sure to also switch the core state
+ * to whatever it was set to with "arm core_state" command.
+ * target code will have set PC to an appropriate resume address.
+ */
+ retval = dpm_write_pc_core_state(dpm, arm->pc);
+ if (retval != ERROR_OK)
+ goto done;
+ /* on Cortex-A5 (as found on NXP VF610 SoC), BX instruction
+ * executed in debug state doesn't appear to set the PC,
+ * explicitly set it with a "MOV pc, r0". This doesn't influence
+ * CPSR on Cortex-A9 so it should be OK. Maybe due to different
+ * debug version?
+ */
+ retval = dpm_write_reg(dpm, arm->pc, 15);
+ if (retval != ERROR_OK)
+ goto done;
+ arm->pc->dirty = false;
- /* flush R0 -- it's *very* dirty by now */
- retval = dpm_write_reg(dpm, &cache->reg_list[0], 0);
- cache->reg_list[0].dirty = false;
+ /* flush R0 and R1 (our scratch registers) */
+ for (unsigned i = 0; i < 2; i++) {
+ retval = dpm_write_reg(dpm, &cache->reg_list[i], i);
+ if (retval != ERROR_OK)
+ goto done;
+ cache->reg_list[i].dirty = false;
+ }
/* (void) */ dpm->finish(dpm);
done:
return retval;
}
-/* Returns ARMV4_5_MODE_ANY or temporary mode to use while reading the
+/* Returns ARM_MODE_ANY or temporary mode to use while reading the
* specified register ... works around flakiness from ARM core calls.
* Caller already filtered out SPSR access; mode is never MODE_SYS
* or MODE_ANY.
*/
-static enum armv4_5_mode dpm_mapmode(struct arm *arm,
- unsigned num, enum armv4_5_mode mode)
+static enum arm_mode dpm_mapmode(struct arm *arm,
+ unsigned num, enum arm_mode mode)
{
- enum armv4_5_mode amode = arm->core_mode;
+ enum arm_mode amode = arm->core_mode;
/* don't switch if the mode is already correct */
- if (amode == ARMV4_5_MODE_SYS)
- amode = ARMV4_5_MODE_USR;
+ if (amode == ARM_MODE_SYS)
+ amode = ARM_MODE_USR;
if (mode == amode)
- return ARMV4_5_MODE_ANY;
+ return ARM_MODE_ANY;
switch (num) {
- /* don't switch for non-shadowed registers (r0..r7, r15/pc, cpsr) */
- case 0 ... 7:
- case 15:
- case 16:
- break;
- /* r8..r12 aren't shadowed for anything except FIQ */
- case 8 ... 12:
- if (mode == ARMV4_5_MODE_FIQ)
+ /* don't switch for non-shadowed registers (r0..r7, r15/pc, cpsr) */
+ case 0 ... 7:
+ case 15:
+ case 16:
+ break;
+ /* r8..r12 aren't shadowed for anything except FIQ */
+ case 8 ... 12:
+ if (mode == ARM_MODE_FIQ)
+ return mode;
+ break;
+ /* r13/sp, and r14/lr are always shadowed */
+ case 13:
+ case 14:
+ case ARM_VFP_V3_D0 ... ARM_VFP_V3_FPSCR:
return mode;
- break;
- /* r13/sp, and r14/lr are always shadowed */
- case 13:
- case 14:
- return mode;
- default:
- LOG_WARNING("invalid register #%u", num);
- break;
+ default:
+ LOG_WARNING("invalid register #%u", num);
+ break;
}
- return ARMV4_5_MODE_ANY;
+ return ARM_MODE_ANY;
}
+
+/*
+ * Standard ARM register accessors ... there are three methods
+ * in "struct arm", to support individual read/write and bulk read
+ * of registers.
+ */
+
static int arm_dpm_read_core_reg(struct target *target, struct reg *r,
- int regnum, enum armv4_5_mode mode)
+ int regnum, enum arm_mode mode)
{
struct arm_dpm *dpm = target_to_arm(target)->dpm;
int retval;
- if (regnum < 0 || regnum > 16)
- return ERROR_INVALID_ARGUMENTS;
+ if (regnum < 0 || (regnum > 16 && regnum < ARM_VFP_V3_D0) ||
+ (regnum > ARM_VFP_V3_FPSCR))
+ return ERROR_COMMAND_SYNTAX_ERROR;
if (regnum == 16) {
- if (mode != ARMV4_5_MODE_ANY)
+ if (mode != ARM_MODE_ANY)
regnum = 17;
} else
mode = dpm_mapmode(dpm->arm, regnum, mode);
@@ -422,17 +676,19 @@ static int arm_dpm_read_core_reg(struct target *target, struct reg *r,
if (retval != ERROR_OK)
return retval;
- if (mode != ARMV4_5_MODE_ANY) {
- retval = dpm_modeswitch(dpm, mode);
+ if (mode != ARM_MODE_ANY) {
+ retval = arm_dpm_modeswitch(dpm, mode);
if (retval != ERROR_OK)
goto fail;
}
- retval = dpm_read_reg(dpm, r, regnum);
+ retval = arm_dpm_read_reg(dpm, r, regnum);
+ if (retval != ERROR_OK)
+ goto fail;
/* always clean up, regardless of error */
- if (mode != ARMV4_5_MODE_ANY)
- /* (void) */ dpm_modeswitch(dpm, ARMV4_5_MODE_ANY);
+ if (mode != ARM_MODE_ANY)
+ /* (void) */ arm_dpm_modeswitch(dpm, ARM_MODE_ANY);
fail:
/* (void) */ dpm->finish(dpm);
@@ -440,17 +696,18 @@ fail:
}
static int arm_dpm_write_core_reg(struct target *target, struct reg *r,
- int regnum, enum armv4_5_mode mode, uint32_t value)
+ int regnum, enum arm_mode mode, uint8_t *value)
{
struct arm_dpm *dpm = target_to_arm(target)->dpm;
int retval;
- if (regnum < 0 || regnum > 16)
- return ERROR_INVALID_ARGUMENTS;
+ if (regnum < 0 || (regnum > 16 && regnum < ARM_VFP_V3_D0) ||
+ (regnum > ARM_VFP_V3_FPSCR))
+ return ERROR_COMMAND_SYNTAX_ERROR;
if (regnum == 16) {
- if (mode != ARMV4_5_MODE_ANY)
+ if (mode != ARM_MODE_ANY)
regnum = 17;
} else
mode = dpm_mapmode(dpm->arm, regnum, mode);
@@ -463,8 +720,8 @@ static int arm_dpm_write_core_reg(struct target *target, struct reg *r,
if (retval != ERROR_OK)
return retval;
- if (mode != ARMV4_5_MODE_ANY) {
- retval = dpm_modeswitch(dpm, mode);
+ if (mode != ARM_MODE_ANY) {
+ retval = arm_dpm_modeswitch(dpm, mode);
if (retval != ERROR_OK)
goto fail;
}
@@ -472,8 +729,8 @@ static int arm_dpm_write_core_reg(struct target *target, struct reg *r,
retval = dpm_write_reg(dpm, r, regnum);
/* always clean up, regardless of error */
- if (mode != ARMV4_5_MODE_ANY)
- /* (void) */ dpm_modeswitch(dpm, ARMV4_5_MODE_ANY);
+ if (mode != ARM_MODE_ANY)
+ /* (void) */ arm_dpm_modeswitch(dpm, ARM_MODE_ANY);
fail:
/* (void) */ dpm->finish(dpm);
@@ -493,7 +750,7 @@ static int arm_dpm_full_context(struct target *target)
goto done;
do {
- enum armv4_5_mode mode = ARMV4_5_MODE_ANY;
+ enum arm_mode mode = ARM_MODE_ANY;
did_read = false;
@@ -517,58 +774,346 @@ static int arm_dpm_full_context(struct target *target)
did_read = true;
mode = r->mode;
- /* For R8..R12 when we've entered debug
- * state in FIQ mode... patch 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 == ARMV4_5_MODE_ANY)
- mode = ARMV4_5_MODE_USR;
+ if (mode != ARM_MODE_ANY)
+ retval = arm_dpm_modeswitch(dpm, mode);
+ else
+ retval = arm_dpm_modeswitch(dpm, ARM_MODE_USR);
- /* REVISIT error checks */
- retval = dpm_modeswitch(dpm, mode);
+ if (retval != ERROR_OK)
+ goto done;
}
if (r->mode != mode)
continue;
/* CPSR was read, so "R16" must mean SPSR */
- retval = dpm_read_reg(dpm,
+ retval = arm_dpm_read_reg(dpm,
&cache->reg_list[i],
(r->num == 16) ? 17 : r->num);
-
+ if (retval != ERROR_OK)
+ goto done;
}
} while (did_read);
- retval = dpm_modeswitch(dpm, ARMV4_5_MODE_ANY);
+ retval = arm_dpm_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 dpm_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 dpm_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 = dpm_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 dpm_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 dpm_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 = dpm_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 dpm_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 = dpm_watchpoint_setup(dpm, i, wp);
+ break;
+ }
+ }
+ }
+
+ return retval;
+}
+
+static int dpm_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 arm_dpm_report_wfar(struct arm_dpm *dpm, uint32_t addr)
+{
+ switch (dpm->arm->core_state) {
+ case ARM_STATE_ARM:
+ addr -= 8;
+ break;
+ case ARM_STATE_THUMB:
+ case ARM_STATE_THUMB_EE:
+ addr -= 4;
+ break;
+ case ARM_STATE_JAZELLE:
+ case ARM_STATE_AARCH64:
+ /* ?? */
+ break;
+ }
+ dpm->wp_pc = addr;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * Other debug and support utilities
+ */
+
+void arm_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)) {
+ case DSCR_ENTRY_HALT_REQ: /* HALT request from debugger */
+ case DSCR_ENTRY_EXT_DBG_REQ: /* EDBGRQ */
+ target->debug_reason = DBG_REASON_DBGRQ;
+ break;
+ case DSCR_ENTRY_BREAKPOINT: /* HW breakpoint */
+ case DSCR_ENTRY_BKPT_INSTR: /* vector catch */
+ target->debug_reason = DBG_REASON_BREAKPOINT;
+ break;
+ case DSCR_ENTRY_IMPRECISE_WATCHPT: /* asynch watchpoint */
+ case DSCR_ENTRY_PRECISE_WATCHPT:/* precise 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 arm_dpm_setup(struct arm_dpm *dpm)
{
struct arm *arm = dpm->arm;
struct target *target = arm->target;
- struct reg_cache *cache;
+ struct reg_cache *cache = 0;
arm->dpm = dpm;
+ /* register access setup */
arm->full_context = arm_dpm_full_context;
arm->read_core_reg = arm_dpm_read_core_reg;
arm->write_core_reg = arm_dpm_write_core_reg;
- cache = armv4_5_build_reg_cache(target, arm);
- if (!cache)
- return ERROR_FAIL;
+ if (arm->core_cache == NULL) {
+ cache = arm_build_reg_cache(target, arm);
+ if (!cache)
+ return ERROR_FAIL;
- *register_get_last_cache_p(&target->reg_cache) = cache;
+ *register_get_last_cache_p(&target->reg_cache) = cache;
+ }
+ /* coprocessor access setup */
arm->mrc = dpm_mrc;
arm->mcr = dpm_mcr;
+ /* breakpoint setup -- optional until it works everywhere */
+ if (!target->type->add_breakpoint) {
+ target->type->add_breakpoint = dpm_add_breakpoint;
+ target->type->remove_breakpoint = dpm_remove_breakpoint;
+ }
+
+ /* watchpoint setup */
+ target->type->add_watchpoint = dpm_add_watchpoint;
+ target->type->remove_watchpoint = dpm_remove_watchpoint;
+
+ /* FIXME add vector catch support */
+
+ 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);
+
+ 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;
}
@@ -578,6 +1123,21 @@ int arm_dpm_setup(struct arm_dpm *dpm)
*/
int arm_dpm_initialize(struct arm_dpm *dpm)
{
- /* FIXME -- nothing yet */
+ /* 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;
}