1 /*
2 * SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #ifndef _ESP_CPU_UTILS_H
8 #define _ESP_CPU_UTILS_H
9
10 #ifdef __cplusplus
11 extern "C" {
12 #endif
13
14 /**
15 * @brief Fetch the PC value of the previous instruction
16 *
17 * @param pc PC value of the current backtrace frame
18 *
19 */
esp_cpu_process_stack_pc(uint32_t pc)20 static inline uint32_t esp_cpu_process_stack_pc(uint32_t pc)
21 {
22 if (pc & 0x80000000) {
23 //Top two bits of a0 (return address) specify window increment. Overwrite to map to address space.
24 pc = (pc & 0x3fffffff) | 0x40000000;
25 }
26 //Minus 3 to get PC of previous instruction (i.e. instruction executed before return address)
27 return pc - 3;
28 }
29
30 #ifdef __cplusplus
31 }
32 #endif
33
34 #endif // _ESP_CPU_UTILS_H
35
