mirror of
https://github.com/espressif/esp-idf.git
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037c079e9a
This commit refactors backtracing within the panic handler so that a common function esp_backtrace_get_next_frame() is used iteratively to traverse a callstack. A esp_backtrace_print() function has also be added that allows the printing of a backtrace at runtime. The esp_backtrace_print() function allows unity to print the backtrace of failed test cases and jump back to the main test menu without the need reset the chip. esp_backtrace_print() can also be used as a debugging function by users. - esp_stack_ptr_is_sane() moved to soc_memory_layout.h - removed uncessary includes of "esp_debug_helpers.h"
133 lines
4.4 KiB
C
133 lines
4.4 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __ASSEMBLER__
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#include "esp_err.h"
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#define ESP_WATCHPOINT_LOAD 0x40000000
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#define ESP_WATCHPOINT_STORE 0x80000000
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#define ESP_WATCHPOINT_ACCESS 0xC0000000
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/*
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* @brief Structure used for backtracing
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*
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* This structure stores the backtrace information of a particular stack frame
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* (i.e. the PC and SP). This structure is used iteratively with the
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* esp_cpu_get_next_backtrace_frame() function to traverse each frame within a
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* single stack. The next_pc represents the PC of the current frame's caller, thus
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* a next_pc of 0 indicates that the current frame is the last frame on the stack.
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*
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* @note Call esp_backtrace_get_start() to obtain initialization values for
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* this structure
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*/
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typedef struct {
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uint32_t pc; /* PC of the current frame */
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uint32_t sp; /* SP of the current frame */
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uint32_t next_pc; /* PC of the current frame's caller */
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} esp_backtrace_frame_t;
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/**
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* @brief If an OCD is connected over JTAG. set breakpoint 0 to the given function
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* address. Do nothing otherwise.
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* @param fn Pointer to the target breakpoint position
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*/
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void esp_set_breakpoint_if_jtag(void *fn);
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/**
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* @brief Set a watchpoint to break/panic when a certain memory range is accessed.
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*
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* @param no Watchpoint number. On the ESP32, this can be 0 or 1.
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* @param adr Base address to watch
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* @param size Size of the region, starting at the base address, to watch. Must
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* be one of 2^n, with n in [0..6].
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* @param flags One of ESP_WATCHPOINT_* flags
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*
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* @return ESP_ERR_INVALID_ARG on invalid arg, ESP_OK otherwise
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*
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* @warning The ESP32 watchpoint hardware watches a region of bytes by effectively
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* masking away the lower n bits for a region with size 2^n. If adr does
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* not have zero for these lower n bits, you may not be watching the
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* region you intended.
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*/
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esp_err_t esp_set_watchpoint(int no, void *adr, int size, int flags);
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/**
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* @brief Clear a watchpoint
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*
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* @param no Watchpoint to clear
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*
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*/
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void esp_clear_watchpoint(int no);
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/**
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* Get the first frame of the current stack's backtrace
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*
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* Given the following function call flow (B -> A -> X -> esp_backtrace_get_start),
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* this function will do the following.
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* - Flush CPU registers and window frames onto the current stack
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* - Return PC and SP of function A (i.e. start of the stack's backtrace)
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* - Return PC of function B (i.e. next_pc)
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*
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* @note This function is implemented in assembly
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*
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* @param[out] pc PC of the first frame in the backtrace
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* @param[out] sp SP of the first frame in the backtrace
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* @param[out] next_pc PC of the first frame's caller
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*/
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extern void esp_backtrace_get_start(uint32_t *pc, uint32_t *sp, uint32_t *next_pc);
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/**
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* Get the next frame on a stack for backtracing
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*
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* Given a stack frame(i), this function will obtain the next stack frame(i-1)
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* on the same call stack (i.e. the caller of frame(i)). This function is meant to be
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* called iteratively when doing a backtrace.
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*
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* Entry Conditions: Frame structure containing valid SP and next_pc
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* Exit Conditions:
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* - Frame structure updated with SP and PC of frame(i-1). next_pc now points to frame(i-2).
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* - If a next_pc of 0 is returned, it indicates that frame(i-1) is last frame on the stack
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*
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* @param[inout] frame Pointer to frame structure
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*
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* @return
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* - True if the SP and PC of the next frame(i-1) are sane
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* - False otherwise
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*/
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bool esp_backtrace_get_next_frame(esp_backtrace_frame_t *frame);
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/**
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* @brief Print the backtrace of the current stack
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*
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* @param depth The maximum number of stack frames to print (should be > 0)
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*
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* @return
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* - ESP_OK Backtrace successfully printed to completion or to depth limit
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* - ESP_FAIL Backtrace is corrupted
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*/
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esp_err_t esp_backtrace_print(int depth);
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#endif
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#ifdef __cplusplus
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}
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#endif
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