61 lines
1.9 KiB
ArmAsm
61 lines
1.9 KiB
ArmAsm
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include <freertos/xtensa_context.h>
|
|
|
|
.extern esp_clear_watchpoint
|
|
.text
|
|
|
|
/**
|
|
* extern void switch_stack_enter(portSTACK_TYPE *stack, portSTACK_TYPE *backup_stack);
|
|
*/
|
|
.globl esp_switch_stack_enter
|
|
.type esp_switch_stack_enter,@function
|
|
.align 4
|
|
esp_switch_stack_enter:
|
|
|
|
#ifndef __XTENSA_CALL0_ABI__
|
|
entry sp, 0x10
|
|
mov a4, a1
|
|
s32i a4, a3, 0 /* on a3 there is a safe place to save the current stack */
|
|
l32i a4, a2, 0 /* obtains the user allocated stack buffer */
|
|
mov a1, a4 /* sp register now contains caller specified stack */
|
|
retw
|
|
#else
|
|
#error "this code is written for Window ABI"
|
|
#endif
|
|
|
|
/**
|
|
* extern void switch_stack_exit(portSTACK_TYPE *backup_stack);
|
|
*/
|
|
.globl esp_switch_stack_exit
|
|
.type esp_switch_stack_exit,@function
|
|
.align 4
|
|
esp_switch_stack_exit:
|
|
|
|
#ifndef __XTENSA_CALL0_ABI__
|
|
entry sp, 0x10
|
|
|
|
#if CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK
|
|
movi a6, 2
|
|
movi a4, esp_clear_watchpoint
|
|
callx4 a4 /* clear the watchpoint before releasing stack */
|
|
#endif
|
|
|
|
l32i a4, a2, 0 /* recover the original task stack */
|
|
mov a1, a4 /* put it on sp register again */
|
|
retw
|
|
#else
|
|
#error "this code is written for Window ABI"
|
|
#endif
|