esp-idf/components/xtensa/debug_helpers.c

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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_attr.h"
#include "esp_err.h"
#include "esp_debug_helpers.h"
#include "soc/soc_memory_layout.h"
#include "soc/cpu.h"
#include "sdkconfig.h"
#include "esp_rom_sys.h"
bool IRAM_ATTR esp_backtrace_get_next_frame(esp_backtrace_frame_t *frame)
{
//Use frame(i-1)'s BS area located below frame(i)'s sp to get frame(i-1)'s sp and frame(i-2)'s pc
void *base_save = (void *)frame->sp; //Base save area consists of 4 words under SP
frame->pc = frame->next_pc;
frame->next_pc = *((uint32_t *)(base_save - 16)); //If next_pc = 0, indicates frame(i-1) is the last frame on the stack
frame->sp = *((uint32_t *)(base_save - 12));
//Return true if both sp and pc of frame(i-1) are sane, false otherwise
return (esp_stack_ptr_is_sane(frame->sp) && esp_ptr_executable((void*)esp_cpu_process_stack_pc(frame->pc)));
}
esp_err_t IRAM_ATTR esp_backtrace_print(int depth)
{
//Check arguments
if (depth <= 0) {
return ESP_ERR_INVALID_ARG;
}
//Initialize stk_frame with first frame of stack
esp_backtrace_frame_t stk_frame;
esp_backtrace_get_start(&(stk_frame.pc), &(stk_frame.sp), &(stk_frame.next_pc));
//esp_cpu_get_backtrace_start(&stk_frame);
esp_rom_printf("\r\n\r\nBacktrace:");
esp_rom_printf("0x%08X:0x%08X ", esp_cpu_process_stack_pc(stk_frame.pc), stk_frame.sp);
//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))) ?
false : true;
uint32_t i = (depth <= 0) ? INT32_MAX : depth;
while (i-- > 0 && stk_frame.next_pc != 0 && !corrupted) {
if (!esp_backtrace_get_next_frame(&stk_frame)) { //Get previous stack frame
corrupted = true;
}
esp_rom_printf("0x%08X:0x%08X ", esp_cpu_process_stack_pc(stk_frame.pc), stk_frame.sp);
}
//Print backtrace termination marker
esp_err_t ret = ESP_OK;
if (corrupted) {
esp_rom_printf(" |<-CORRUPTED");
ret = ESP_FAIL;
} else if (stk_frame.next_pc != 0) { //Backtrace continues
esp_rom_printf(" |<-CONTINUES");
}
esp_rom_printf("\r\n\r\n");
return ret;
}