esp-idf/components/xtensa/include/esp_cpu_utils.h

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/*
* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef _ESP_CPU_UTILS_H
#define _ESP_CPU_UTILS_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Fetch the PC value of the previous instruction
*
* @param pc PC value of the current backtrace frame
*
*/
static inline uint32_t esp_cpu_process_stack_pc(uint32_t pc)
{
if (pc & 0x80000000) {
//Top two bits of a0 (return address) specify window increment. Overwrite to map to address space.
pc = (pc & 0x3fffffff) | 0x40000000;
}
//Minus 3 to get PC of previous instruction (i.e. instruction executed before return address)
return pc - 3;
}
#ifdef __cplusplus
}
#endif
#endif // _ESP_CPU_UTILS_H