esp-idf/components/xtensa/expression_with_stack_xtens...

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// 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 xtensa_shared_stack
.extern xtensa_shared_stack_callback
.extern xtensa_shared_stack_function_done
.extern xtensa_shared_stack_env
.extern longjmp
.text
/* extern void esp_shared_stack_invoke_function(void) */
.globl esp_shared_stack_invoke_function
.type esp_shared_stack_invoke_function,@function
.align 4
esp_shared_stack_invoke_function:
#ifndef __XTENSA_CALL0_ABI__
movi a0, 0 /* must not rotate the window here, */
/* the state of execution for shared stack */
/* functions will be completely destroyed at end */
movi a6, xtensa_shared_stack
l32i sp, a6, 0 /* load shared stack pointer */
movi a12, xtensa_shared_stack_callback
l32i a12, a12, 0
callx4 a12 /* call user function */
movi a6, xtensa_shared_stack_function_done
movi a7, 1
s32i a7, a6, 0 /* hint the function was finished */
movi a6, xtensa_shared_stack_env
movi a7, 0
movi a12, longjmp
callx4 a12 /* jump to last clean state previously saved */
ret
#else
#error "this code is written for Window ABI"
#endif