feat(esp8266): refactor ESP8266(xtensa lx106) panic backtrace function

2025-07-15 08:32:42 +08:00 · 2019-08-22 20:11:59 +08:00
parent 0193d06019
commit 767d995466
6 changed files with 269 additions and 156 deletions
--- a/components/esp8266/source/backtrace.c
+++ b/components/esp8266/source/backtrace.c
@ -0,0 +1,119 @@
+// Copyright 2019-2020 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 <stdint.h>
+#include "esp8266/eagle_soc.h"
+
+static inline uint32_t prev_text_size(const uint32_t pc)
+{
+    uint32_t size;
+    extern uint32_t _text_start, _text_end;
+
+    if (pc > (uint32_t)&_text_start && pc < (uint32_t)&_text_end) {
+        size = pc - (uint32_t )&_text_start;
+    } else if (IS_IRAM(pc)) {
+        size = pc - IRAM_BASE;
+    } else {
+        size = 0;
+    }
+
+    return size;
+}
+
+int xt_pc_is_valid(const void *pc)
+{
+    return prev_text_size((uint32_t)pc) ? 1 : 0;
+}
+
+int xt_retaddr_callee(const void *i_pc, const void *i_sp, const void *i_lr, void **o_pc, void **o_sp)
+{
+    uint32_t lr = (uint32_t)i_lr;
+    uint32_t pc = (uint32_t)i_pc;
+    uint32_t sp = (uint32_t)i_sp;
+
+    uint32_t off = 0;
+    const uint32_t text_size = prev_text_size(pc);
+
+    for (; off < text_size; off++) {
+        if ((*(uint8_t *)(pc - off) == 0x12) &&
+            (*(uint8_t *)(pc - off + 1) == 0xc1)) {
+            const int8_t stk_size = *(int8_t *)(pc - off + 2);
+
+            if (stk_size >= 0 || stk_size % 16 != 0) {
+                continue;
+            }
+
+            sp -= stk_size;
+            pc = *(uint32_t *)(sp - 4);
+
+            *o_sp = (void *)sp;
+            *o_pc = (void *)pc;
+
+            break;
+        } else if ((*(uint8_t *)(pc - off) == 0x92) &&
+                    (((*(uint8_t *)(pc - off + 1)) & 0xf0) == 0xa0) &&
+                    (*(uint8_t *)(pc - off + 3) == 0x90) &&
+                    (*(uint8_t *)(pc - off + 4) == 0x11) &&
+                    (*(uint8_t *)(pc - off + 5) == 0xc0)) {
+            const uint16_t stk_size = ((*(uint8_t *)(pc - off + 1)) & 0x0f) + (*(uint8_t *)(pc - off + 2));
+
+            if (!stk_size || stk_size >= 2048) {
+                continue;
+            }
+
+            sp += stk_size;
+            pc = *(uint32_t *)(sp - 4);
+
+            *o_sp = (void *)sp;
+            *o_pc = (void *)pc;
+
+            break;
+        } else if ((*(uint8_t *)(pc - off) == 0x0d) &&
+                    (*(uint8_t *)(pc - off + 1) == 0xf0)) {
+            pc = lr;
+
+            *o_sp = (void *)sp;
+            *o_pc = (void *)pc;
+            
+            break;
+        }
+    }
+    
+    return off < text_size ? (xt_pc_is_valid(*o_pc) ? 1 : 0) : 0;
+}
+
+void *xt_return_address(int lvl)
+{
+    void *i_sp;
+    void *i_lr = NULL;
+    void *i_pc = (void *)((uint32_t)xt_return_address + 32);
+
+    void *o_pc = NULL;
+    void *o_sp;
+
+    __asm__ __volatile__(
+            "mov    %0,  a1\n"
+            : "=a"(i_sp)
+            : 
+            : "memory"
+    );
+
+    lvl += 2;
+    while(lvl-- && xt_retaddr_callee(i_pc, i_sp, i_lr, &o_pc, &o_sp)) {
+        i_pc = o_pc;
+        i_sp = o_sp;
+    }
+
+    return xt_pc_is_valid(o_pc) ? o_pc : NULL;
+}