57 lines
1.7 KiB
ArmAsm
57 lines
1.7 KiB
ArmAsm
// 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 <freertos/xtensa_context.h>
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.extern esp_clear_watchpoint
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.text
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/**
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* extern void switch_stack_enter(portSTACK_TYPE *stack, portSTACK_TYPE *backup_stack);
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*/
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.globl esp_switch_stack_enter
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.type esp_switch_stack_enter,@function
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.align 4
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esp_switch_stack_enter:
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#ifndef __XTENSA_CALL0_ABI__
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entry sp, 0x10
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mov a4, a1
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s32i a4, a3, 0 /* on a3 there is a safe place to save the current stack */
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l32i a4, a2, 0 /* obtains the user allocated stack buffer */
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mov a1, a4 /* sp register now contains caller specified stack */
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retw
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#else
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#error "this code is written for Window ABI"
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#endif
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/**
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* extern void switch_stack_exit(portSTACK_TYPE *backup_stack);
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*/
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.globl esp_switch_stack_exit
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.type esp_switch_stack_exit,@function
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.align 4
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esp_switch_stack_exit:
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#ifndef __XTENSA_CALL0_ABI__
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entry sp, 0x10
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l32i a4, a2, 0 /* recover the original task stack */
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mov a1, a4 /* put it on sp register again */
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retw
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#else
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#error "this code is written for Window ABI"
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#endif
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