39 lines
1.1 KiB
ArmAsm
39 lines
1.1 KiB
ArmAsm
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/*
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* Copyright (c) 2020 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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#include <xtensa/coreasm.h>
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#include <xtensa/corebits.h>
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#include <xtensa/config/system.h>
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#include <xtensa/hal.h>
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#include <xtensa-asm2-context.h>
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.section .iram1, "ax"
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.align 4
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.global z_xtensa_backtrace_get_start
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.type z_xtensa_backtrace_get_start, @function
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z_xtensa_backtrace_get_start:
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entry a1, 32
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/* Spill registers onto stack (excluding this function) */
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call8 xthal_window_spill
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/* a2, a3, a4 should be out arguments for i PC, i SP, i-1 PC respectively.
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* Use a6 and a7 as scratch */
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/* Load address for interrupted stack */
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l32i a6, a5, 0
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/* Load i PC in a7 */
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l32i a7, a6, BSA_PC_OFF
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/* Store value of i PC in a2 */
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s32i a7, a2, 0
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/* Load value for (i-1) PC, which return address of i into a7 */
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l32i a7, a6, BSA_A0_OFF
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/* Store value of (i-1) PC in a4 */
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s32i a7, a4, 0
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/* Add BASE_SAVE_AREA_SIZE in interrupted stack to get i SP */
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addi a6, a6, BASE_SAVE_AREA_SIZE
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/* Store i SP in a3 */
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s32i a6, a3, 0
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retw
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