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gdb: Modify PC in case of invalid PC

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Signed-off-by: Sachin Parekh <sachin.parekh@espressif.com>
This commit is contained in:
Sachin Parekh 2020-04-17 19:06:26 +05:30 committed by bot
parent f32582b588
commit 6618e0c31d
3 changed files with 35 additions and 2 deletions
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1
components/esp32/ld/esp32.project.ld.in
View File

@ -142,6 +142,7 @@ SECTIONS
. = 0x3C0;
KEEP(*(.DoubleExceptionVector.text));
. = 0x400;
_invalid_pc_placeholder = ABSOLUTE(.);
*(.*Vector.literal)
*(.UserEnter.literal);

18
components/esp32/panic.c
View File

@ -188,6 +188,8 @@ static const char *edesc[] = {
#define NUM_EDESCS (sizeof(edesc) / sizeof(char *))
extern int _invalid_pc_placeholder;
static void commonErrorHandler(XtExcFrame *frame);
static inline void disableAllWdts();
static void illegal_instruction_helper(XtExcFrame *frame);
@ -309,6 +311,14 @@ void panicHandler(XtExcFrame *frame)
if (esp_cpu_in_ocd_debug_mode()) {
disableAllWdts();
if (!(esp_ptr_executable((void *)((frame->pc & 0x3fffffffU) | 0x40000000U)) && (frame->pc & 0xC0000000U))) {
/* Xtensa ABI sets the 2 MSBs of the PC according to the windowed call size
* Incase the PC is invalid, GDB will fail to translate addresses to function names
* Hence replacing the PC to a placeholder address in case of invalid PC
*/
frame->pc = (uint32_t)&_invalid_pc_placeholder;
}
if (frame->exccause == PANIC_RSN_INTWDT_CPU0 ||
frame->exccause == PANIC_RSN_INTWDT_CPU1) {
TIMERG1.int_clr_timers.wdt = 1;
@ -354,6 +364,14 @@ void xt_unhandled_exception(XtExcFrame *frame)
APPTRACE_ONPANIC_HOST_FLUSH_TMO);
#endif
#endif
if (!(esp_ptr_executable((void *)((frame->pc & 0x3fffffffU) | 0x40000000U)) && (frame->pc & 0xC0000000U))) {
/* Xtensa ABI sets the 2 MSBs of the PC according to the windowed call size
* Incase the PC is invalid, GDB will fail to translate addresses to function names
* Hence replacing the PC to a placeholder address in case of invalid PC
*/
frame->pc = (uint32_t)&_invalid_pc_placeholder;
}
//Stick a hardware breakpoint on the address the handler returns to. This way, the OCD debugger
//will kick in exactly at the context the error happened.
setFirstBreakpoint(frame->pc);

18
components/esp_gdbstub/xtensa/gdbstub_xtensa.c
View File

@ -23,6 +23,8 @@
#warning "gdbstub_xtensa: revisit the implementation for Call0 ABI"
#endif
extern int _invalid_pc_placeholder;
static void init_regfile(esp_gdbstub_gdb_regfile_t *dst)
{
memset(dst, 0, sizeof(*dst));
@ -46,7 +48,15 @@ void esp_gdbstub_frame_to_regfile(const esp_gdbstub_frame_t *frame, esp_gdbstub_
{
init_regfile(dst);
const uint32_t *a_regs = (const uint32_t *) &frame->a0;
dst->pc = (frame->pc & 0x3fffffffU) | 0x40000000U;
if (!(esp_ptr_executable((void *)((frame->pc & 0x3fffffffU) | 0x40000000U)) && (frame->pc & 0xC0000000U))) {
/* Xtensa ABI sets the 2 MSBs of the PC according to the windowed call size
* Incase the PC is invalid, GDB will fail to translate addresses to function names
* Hence replacing the PC to a placeholder address in case of invalid PC
*/
dst->pc = (uint32_t)&_invalid_pc_placeholder;
} else {
dst->pc = (frame->pc & 0x3fffffffU) | 0x40000000U;
}
for (int i = 0; i < 16; i++) {
dst->a[i] = a_regs[i];
@ -72,7 +82,11 @@ static void solicited_frame_to_regfile(const XtSolFrame *frame, esp_gdbstub_gdb_
{
init_regfile(dst);
const uint32_t *a_regs = (const uint32_t *) &frame->a0;
dst->pc = (frame->pc & 0x3fffffffU) | 0x40000000U;
if (!(esp_ptr_executable((void *)((frame->pc & 0x3fffffffU) | 0x40000000U)) && (frame->pc & 0xC0000000U))) {
dst->pc = (uint32_t)&_invalid_pc_placeholder;
} else {
dst->pc = (frame->pc & 0x3fffffffU) | 0x40000000U;
}
/* only 4 registers saved in the solicited frame */
for (int i = 0; i < 4; i++) {