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expression_with_stack_xtensa: protected switch stacks function to compile only on window ABI supported platform

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This commit is contained in:
Felipe Neves
2019-11-15 17:14:48 +08:00
parent 11266ef05d
commit 002f38c7f5
2 changed files with 47 additions and 12 deletions
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14
components/esp_common/include/esp_expression_with_stack.h
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@@ -1,3 +1,17 @@
// 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.
#ifndef __ESP_EXPRESSION_WITH_STACK_H #ifndef __ESP_EXPRESSION_WITH_STACK_H
#define __ESP_EXPRESSION_WITH_STACK_H #define __ESP_EXPRESSION_WITH_STACK_H

45
components/xtensa/expression_with_stack_xtensa.S
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@@ -1,5 +1,16 @@
#include <xtensa/coreasm.h> // Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
#include <freertos/xtensa_context.h> //
// 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.
.text .text
/** /**
@@ -9,12 +20,17 @@
.type esp_switch_stack_enter,@function .type esp_switch_stack_enter,@function
.align 4 .align 4
esp_switch_stack_enter: esp_switch_stack_enter:
entry sp, 0x10
mov a4, a1 #ifndef __XTENSA_CALL0_ABI__
s32i a4, a3, 0 /* on a3 there is a safe place to save the current stack */ entry sp, 0x10
l32i a4, a2, 0 /* obtains the user allocated stack buffer */ mov a4, a1
mov a1, a4 /* sp register now contains caller specified stack */ s32i a4, a3, 0 /* on a3 there is a safe place to save the current stack */
retw 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); * extern void switch_stack_exit(portSTACK_TYPE *backup_stack);
@@ -23,7 +39,12 @@ esp_switch_stack_enter:
.type esp_switch_stack_exit,@function .type esp_switch_stack_exit,@function
.align 4 .align 4
esp_switch_stack_exit: esp_switch_stack_exit:
entry sp, 0x10
l32i a4, a2, 0 /* recover the original task stack */ #ifndef __XTENSA_CALL0_ABI__
mov a1, a4 /* put it on sp register again */ entry sp, 0x10
retw 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