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system: stack watchpoint support on C3

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Closes IDF-2307
This commit is contained in:
Jakob Hasse
2020-12-03 14:28:06 +08:00
parent 9827adaa09
commit b51889dccb
6 changed files with 44 additions and 14 deletions
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20
tools/test_apps/system/panic/main/test_panic_main.c
View File

@@ -100,14 +100,30 @@ static void IRAM_ATTR test_int_wdt_cache_disabled(void)
}
}
/**
* This function overwrites the stack beginning from the valid area continuously towards and beyond
* the end of the stack (stack base) of the current task.
* This is to test stack protection measures like a watchpoint at the end of the stack.
*
* @note: This test DOES NOT write beyond the stack limit. It only writes up to exactly the limit itself.
* The FreeRTOS stack protection mechanisms all trigger shortly before the end of the stack.
*/
static void test_stack_overflow(void)
{
register uint32_t* sp asm("sp");
uint32_t *end = sp - CONFIG_ESP_MAIN_TASK_STACK_SIZE;
TaskStatus_t pxTaskStatus;
vTaskGetInfo(NULL, &pxTaskStatus, pdFALSE, pdFALSE);
uint32_t *end = (uint32_t*) pxTaskStatus.pxStackBase;
// offset - 20 bytes from SP in order to not corrupt the current frame.
// Need to write from higher to lower addresses since the stack grows downwards and the watchpoint/canary is near
// the end of the stack (lowest address).
for (uint32_t* ptr = sp - 5; ptr != end; --ptr) {
*ptr = rand();
*ptr = 0;
}
// trigger a context switch to initiate checking the FreeRTOS stack canary
vTaskDelay(pdMS_TO_TICKS(0));
}
static void test_illegal_instruction(void)

3
tools/test_apps/system/panic/sdkconfig.defaults
View File

@@ -10,3 +10,6 @@ CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK=y
# To panic on task WDT
CONFIG_ESP_TASK_WDT_PANIC=y
# For vTaskGetInfo() used in test_stack_overflow()
CONFIG_FREERTOS_USE_TRACE_FACILITY=y