58 lines
2.2 KiB
ArmAsm
58 lines
2.2 KiB
ArmAsm
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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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/*
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* esp_backtrace_get_start(uint32_t *pc, uint32_t *sp, uint32_t *next_pc)
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*
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* High Addr
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* ..................
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* | i-3 BS |
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* | i-1 locals | Function B
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* .................. i-1 SP
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* | i-2 BS |
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* | i locals | Function A (Start of backtrace)
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* ------------------ i SP
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* | i-1 BS |
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* | i+1 locals | Backtracing function (e.g. esp_backtrace_print())
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* ------------------ i+1 SP
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* | i BS |
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* | i+2 locals | esp_backtrace_get_start() <- This function
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* ------------------ i+2 SP
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* | i+1 BS |
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* | i+3 locals | xthal_window_spill()
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* ------------------ i+3 SP
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* .................. Low Addr
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*/
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.section .iram1, "ax"
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.align 4
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.global esp_backtrace_get_start
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.type esp_backtrace_get_start, @function
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esp_backtrace_get_start:
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entry a1, 32
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call8 xthal_window_spill //Spill registers onto stack (excluding this function)
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//a2, a3, a4 should be out arguments for i SP, i PC, i-1 PC respectively. Use a5 and a6 as scratch
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l32e a5, sp, -16 //Get i PC, which is ret addres of i+1
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s32i a5, a2, 0 //Store i PC to arg *pc
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l32e a6, sp, -12 //Get i+1 SP. Used to access i BS
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l32e a5, a6, -12 //Get i SP
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s32i a5, a3, 0 //Store i SP to arg *sp
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l32e a5, a6, -16 //Get i-1 PC, which is ret address of i
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s32i a5, a4, 0 //Store i-1 PC to arg *next_pc
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retw
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