| /* |
| * Copyright (c) 2020 Espressif Systems (Shanghai) Co., Ltd. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <xtensa/coreasm.h> |
| #include <xtensa/corebits.h> |
| #include <xtensa/config/system.h> |
| #include <xtensa/hal.h> |
| #include <xtensa-asm2-context.h> |
| |
| .section .iram1, "ax" |
| .align 4 |
| .global z_xtensa_backtrace_get_start |
| .type z_xtensa_backtrace_get_start, @function |
| z_xtensa_backtrace_get_start: |
| entry a1, 32 |
| /* Spill registers onto stack (excluding this function) */ |
| call8 xthal_window_spill |
| /* a2, a3, a4 should be out arguments for i PC, i SP, i-1 PC respectively. |
| * Use a6 and a7 as scratch */ |
| |
| /* Load address for interrupted stack */ |
| l32i a6, a5, 0 |
| /* Load i PC in a7 */ |
| l32i a7, a6, BSA_PC_OFF |
| /* Store value of i PC in a2 */ |
| s32i a7, a2, 0 |
| /* Load value for (i-1) PC, which return address of i into a7 */ |
| l32i a7, a6, BSA_A0_OFF |
| /* Store value of (i-1) PC in a4 */ |
| s32i a7, a4, 0 |
| /* Add BASE_SAVE_AREA_SIZE in interrupted stack to get i SP */ |
| addi a6, a6, BASE_SAVE_AREA_SIZE |
| /* Store i SP in a3 */ |
| s32i a6, a3, 0 |
| retw |
