mirror of
https://github.com/espressif/ESP8266_RTOS_SDK.git
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120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
// Copyright 2019-2020 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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#include <stdint.h>
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#include "esp8266/eagle_soc.h"
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static inline uint32_t prev_text_size(const uint32_t pc)
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{
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uint32_t size;
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extern uint32_t _text_start, _text_end;
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if (pc > (uint32_t)&_text_start && pc < (uint32_t)&_text_end) {
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size = pc - (uint32_t )&_text_start;
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} else if (IS_IRAM(pc)) {
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size = pc - IRAM_BASE;
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} else {
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size = 0;
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}
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return size;
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}
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int xt_pc_is_valid(const void *pc)
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{
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return prev_text_size((uint32_t)pc) ? 1 : 0;
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}
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int xt_retaddr_callee(const void *i_pc, const void *i_sp, const void *i_lr, void **o_pc, void **o_sp)
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{
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uint32_t lr = (uint32_t)i_lr;
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uint32_t pc = (uint32_t)i_pc;
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uint32_t sp = (uint32_t)i_sp;
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uint32_t off = 0;
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const uint32_t text_size = prev_text_size(pc);
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for (; off < text_size; off++) {
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if ((*(uint8_t *)(pc - off) == 0x12) &&
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(*(uint8_t *)(pc - off + 1) == 0xc1)) {
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const int8_t stk_size = *(int8_t *)(pc - off + 2);
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if (stk_size >= 0 || stk_size % 16 != 0) {
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continue;
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}
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sp -= stk_size;
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pc = *(uint32_t *)(sp - 4);
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*o_sp = (void *)sp;
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*o_pc = (void *)pc;
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break;
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} else if ((*(uint8_t *)(pc - off) == 0x92) &&
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(((*(uint8_t *)(pc - off + 1)) & 0xf0) == 0xa0) &&
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(*(uint8_t *)(pc - off + 3) == 0x90) &&
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(*(uint8_t *)(pc - off + 4) == 0x11) &&
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(*(uint8_t *)(pc - off + 5) == 0xc0)) {
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const uint16_t stk_size = ((*(uint8_t *)(pc - off + 1)) & 0x0f) + (*(uint8_t *)(pc - off + 2));
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if (!stk_size || stk_size >= 2048) {
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continue;
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}
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sp += stk_size;
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pc = *(uint32_t *)(sp - 4);
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*o_sp = (void *)sp;
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*o_pc = (void *)pc;
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break;
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} else if ((*(uint8_t *)(pc - off) == 0x0d) &&
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(*(uint8_t *)(pc - off + 1) == 0xf0)) {
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pc = lr;
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*o_sp = (void *)sp;
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*o_pc = (void *)pc;
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break;
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}
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}
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return off < text_size ? (xt_pc_is_valid(*o_pc) ? 1 : 0) : 0;
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}
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void *xt_return_address(int lvl)
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{
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void *i_sp;
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void *i_lr = NULL;
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void *i_pc = (void *)((uint32_t)xt_return_address + 32);
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void *o_pc = NULL;
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void *o_sp;
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__asm__ __volatile__(
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"mov %0, a1\n"
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: "=a"(i_sp)
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:
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: "memory"
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);
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lvl += 2;
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while(lvl-- && xt_retaddr_callee(i_pc, i_sp, i_lr, &o_pc, &o_sp)) {
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i_pc = o_pc;
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i_sp = o_sp;
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}
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return xt_pc_is_valid(o_pc) ? o_pc : NULL;
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}
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