137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/*
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* Copyright (c) 2020 Espressif Systems (Shanghai) Co., Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "xtensa/corebits.h"
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#include "xtensa_backtrace.h"
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#include <zephyr/sys/printk.h>
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#if defined(CONFIG_SOC_SERIES_ESP32)
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#include "soc/soc_memory_layout.h"
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#elif defined(CONFIG_SOC_FAMILY_INTEL_ADSP)
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#include "debug_helpers.h"
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#elif defined(CONFIG_SOC_XTENSA_DC233C)
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#include "backtrace_helpers.h"
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#endif
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static int mask, cause;
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static inline uint32_t xtensa_cpu_process_stack_pc(uint32_t pc)
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{
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if (pc & 0x80000000) {
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/* Top two bits of a0 (return address) specify window increment.
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* Overwrite to map to address space.
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*/
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if (cause != EXCCAUSE_INSTR_PROHIBITED) {
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pc = (pc & 0x3fffffff) | mask;
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} else {
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pc = (pc & 0x3fffffff) | 0x40000000;
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}
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}
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/* Minus 3 to get PC of previous instruction
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* (i.e. instruction executed before return address)
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*/
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return pc - 3;
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}
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static inline bool xtensa_stack_ptr_is_sane(uint32_t sp)
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{
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#if defined(CONFIG_SOC_SERIES_ESP32)
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return esp_stack_ptr_is_sane(sp);
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#elif defined(CONFIG_SOC_FAMILY_INTEL_ADSP)
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return intel_adsp_ptr_is_sane(sp);
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#elif defined(CONFIG_SOC_XTENSA_DC233C)
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return xtensa_dc233c_stack_ptr_is_sane(sp);
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#else
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#warning "xtensa_stack_ptr_is_sane is not defined for this platform"
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#endif
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}
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static inline bool xtensa_ptr_executable(const void *p)
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{
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#if defined(CONFIG_SOC_SERIES_ESP32)
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return esp_ptr_executable(p);
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#elif defined(CONFIG_SOC_FAMILY_INTEL_ADSP)
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return intel_adsp_ptr_executable(p);
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#elif defined(CONFIG_SOC_XTENSA_DC233C)
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return xtensa_dc233c_ptr_executable(p);
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#else
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#warning "xtensa_ptr_executable is not defined for this platform"
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#endif
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}
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bool xtensa_backtrace_get_next_frame(struct xtensa_backtrace_frame_t *frame)
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{
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/* Use frame(i-1)'s BS area located below frame(i)'s
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* sp to get frame(i-1)'s sp and frame(i-2)'s pc
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*/
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/* Base save area consists of 4 words under SP */
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char *base_save = (char *)frame->sp;
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frame->pc = frame->next_pc;
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/* If next_pc = 0, indicates frame(i-1) is the last
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* frame on the stack
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*/
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frame->next_pc = *((uint32_t *)(base_save - 16));
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frame->sp = *((uint32_t *)(base_save - 12));
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/* Return true if both sp and pc of frame(i-1) are sane,
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* false otherwise
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*/
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return (xtensa_stack_ptr_is_sane(frame->sp) &&
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xtensa_ptr_executable((void *)
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xtensa_cpu_process_stack_pc(frame->pc)));
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}
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int xtensa_backtrace_print(int depth, int *interrupted_stack)
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{
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/* Check arguments */
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if (depth <= 0) {
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return -1;
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}
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/* Initialize stk_frame with first frame of stack */
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struct xtensa_backtrace_frame_t stk_frame;
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xtensa_backtrace_get_start(&(stk_frame.pc), &(stk_frame.sp),
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&(stk_frame.next_pc), interrupted_stack);
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__asm__ volatile("l32i a4, a3, 0");
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__asm__ volatile("l32i a4, a4, 4");
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__asm__ volatile("mov %0, a4" : "=r"(cause));
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if (cause != EXCCAUSE_INSTR_PROHIBITED) {
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mask = stk_frame.pc & 0xc0000000;
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}
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printk("\r\n\r\nBacktrace:");
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printk("0x%08x:0x%08x ",
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xtensa_cpu_process_stack_pc(stk_frame.pc),
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stk_frame.sp);
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/* Check if first frame is valid */
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bool corrupted = !(xtensa_stack_ptr_is_sane(stk_frame.sp) &&
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(xtensa_ptr_executable((void *)
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xtensa_cpu_process_stack_pc(stk_frame.pc)) ||
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/* Ignore the first corrupted PC in case of InstrFetchProhibited */
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cause == EXCCAUSE_INSTR_PROHIBITED));
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while (depth-- > 0 && stk_frame.next_pc != 0 && !corrupted) {
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/* Get previous stack frame */
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if (!xtensa_backtrace_get_next_frame(&stk_frame)) {
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corrupted = true;
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}
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printk("0x%08x:0x%08x ", xtensa_cpu_process_stack_pc(stk_frame.pc), stk_frame.sp);
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}
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/* Print backtrace termination marker */
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int ret = 0;
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if (corrupted) {
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printk(" |<-CORRUPTED");
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ret = -1;
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} else if (stk_frame.next_pc != 0) { /* Backtrace continues */
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printk(" |<-CONTINUES");
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}
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printk("\r\n\r\n");
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return ret;
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}
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