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panic: skip over the first invalid PC in case of InstrFetchProhibited

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InstrFetchProhibited usually occurs because of a jump to an invalid
pointer. In this case, PC in the exception frame is the address of
the jump destination. 'esp_ptr_executable' check in print_backtrace
function recognizes the first frame as invalid, and the backtrace is
interrupted. This prevents the user from finding the location where
the invalid pointer is dereferenced.

Bypass the 'esp_ptr_executable' check if the exception cause is
InstrFetchProhibited. Update the test case to no longer ignore this
issue.
This commit is contained in:
Ivan Grokhotkov 2020-07-29 12:20:52 +02:00
parent 48b659b474
commit 5ff9cd495e
3 changed files with 10 additions and 7 deletions
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6
components/esp_system/port/panic_handler.c
View File

@ -156,7 +156,9 @@ static void print_backtrace(const void *f, int core)
//Check if first frame is valid
bool corrupted = !(esp_stack_ptr_is_sane(stk_frame.sp) &&
esp_ptr_executable((void *)esp_cpu_process_stack_pc(stk_frame.pc)));
(esp_ptr_executable((void *)esp_cpu_process_stack_pc(stk_frame.pc)) ||
/* Ignore the first corrupted PC in case of InstrFetchProhibited */
frame->exccause == EXCCAUSE_INSTR_PROHIBITED));
uint32_t i = ((depth <= 0) ? INT32_MAX : depth) - 1; //Account for stack frame that's already printed
while (i-- > 0 && stk_frame.next_pc != 0 && !corrupted) {
@ -456,7 +458,7 @@ static void frame_to_panic_info(XtExcFrame *frame, panic_info_t *info, bool pseu
info->description = "Exception was unhandled.";
if (info->reason == reason[0]) {
if (frame->exccause == EXCCAUSE_ILLEGAL) {
info->details = print_illegal_instruction_details;
}
}

7
tools/test_apps/system/panic/panic_tests.py
View File

@ -107,10 +107,7 @@ def instr_fetch_prohibited_inner(env, test_name):
with get_dut(env, test_name, "test_instr_fetch_prohibited") as dut:
dut.expect_gme("InstrFetchProhibited")
dut.expect_reg_dump(0)
dut.expect("Backtrace:")
# At the moment the backtrace is corrupted, need to jump over the first PC in case of InstrFetchProhibited.
# Fix this and change expect to expect_none.
dut.expect("CORRUPTED")
dut.expect_backtrace()
dut.expect_elf_sha256()
dut.expect_none("Guru Meditation")
dut.expect_none("CORRUPTED", "Guru Meditation")
test_common(dut, test_name)

4
tools/test_apps/system/panic/test_panic_util/test_panic_util.py
View File

@ -76,6 +76,10 @@ class PanicTestMixin(object):
elf_sha256_len = int(sdkconfig.get("CONFIG_APP_RETRIEVE_LEN_ELF_SHA", "16"))
self.expect("ELF file SHA256: " + elf_sha256[0:elf_sha256_len])
def expect_backtrace(self):
self.expect("Backtrace:")
self.expect_none("CORRUPTED")
def __enter__(self):
self._raw_data = None
return self