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35 lines
757 B
C
35 lines
757 B
C
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/*
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* SPDX-FileCopyrightText: 2021 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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#ifndef _ESP_CPU_UTILS_H
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#define _ESP_CPU_UTILS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Fetch the PC value of the previous instruction
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*
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* @param pc PC value of the current backtrace frame
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*
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*/
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static inline uint32_t esp_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. Overwrite to map to address space.
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pc = (pc & 0x3fffffff) | 0x40000000;
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}
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//Minus 3 to get PC of previous instruction (i.e. instruction executed before return address)
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return pc - 3;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif // _ESP_CPU_UTILS_H
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