expression_with_stack_xtensa_asm.S
1 // Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include <freertos/xtensa_context.h> 16 17 .extern xtensa_shared_stack 18 .extern xtensa_shared_stack_callback 19 .extern xtensa_shared_stack_function_done 20 .extern xtensa_shared_stack_env 21 .extern longjmp 22 .text 23 24 25 /* extern void esp_shared_stack_invoke_function(void) */ 26 27 .globl esp_shared_stack_invoke_function 28 .type esp_shared_stack_invoke_function,@function 29 .align 4 30 esp_shared_stack_invoke_function: 31 32 #ifndef __XTENSA_CALL0_ABI__ 33 movi a0, 0 /* must not rotate the window here, */ 34 /* the state of execution for shared stack */ 35 /* functions will be completely destroyed at end */ 36 movi a6, xtensa_shared_stack 37 l32i sp, a6, 0 /* load shared stack pointer */ 38 movi a12, xtensa_shared_stack_callback 39 l32i a12, a12, 0 40 callx4 a12 /* call user function */ 41 movi a6, xtensa_shared_stack_function_done 42 movi a7, 1 43 s32i a7, a6, 0 /* hint the function was finished */ 44 movi a6, xtensa_shared_stack_env 45 movi a7, 0 46 movi a12, longjmp 47 callx4 a12 /* jump to last clean state previously saved */ 48 ret 49 #else 50 #error "this code is written for Window ABI" 51 #endif