ESP-IDF
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Outline
#include <esp_expression_with_stack.h>
#include <setjmp.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/portmacro.h"
xtensa_shared_stack
xtensa_shared_stack_callback
xtensa_shared_stack_env
xtensa_shared_stack_function_done
xtensa_shared_stack_spinlock
current_task_stack
esp_switch_stack_setup(StackType_t *, size_t)
esp_execute_shared_stack_function(SemaphoreHandle_t, void *, size_t, shared_stack_function)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/esp_system/port/arch/xtensa/expression_with_stack.c
 
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/* * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <esp_expression_with_stack.h> #include <setjmp.h> #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/portmacro.h"5 includes StackType_t *xtensa_shared_stack; shared_stack_function xtensa_shared_stack_callback; jmp_buf xtensa_shared_stack_env; bool xtensa_shared_stack_function_done = false; static portMUX_TYPE xtensa_shared_stack_spinlock = portMUX_INITIALIZER_UNLOCKED; static void *current_task_stack = NULL; extern void esp_shared_stack_invoke_function(void); static void esp_switch_stack_setup(StackType_t *stack, size_t stack_size) { //We need also to tweak current task stackpointer to avoid erroneous //stack overflow indication, so fills the stack with freertos known pattern: memset(stack, 0xa5U, stack_size * sizeof(StackType_t)); StaticTask_t *current = (StaticTask_t *)xTaskGetCurrentTaskHandle(); //Then put the fake stack inside of TCB: current_task_stack = current->pxDummy6; current->pxDummy6 = (void *)stack; StackType_t *top_of_stack = stack + stack_size; //Align stack to a 16byte boundary, as required by CPU specific: top_of_stack = (StackType_t *)(((UBaseType_t)(top_of_stack - 16) & ~0xf)); #if CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK vPortSetStackWatchpoint(stack); #endif xtensa_shared_stack = top_of_stack; }{ ... } void esp_execute_shared_stack_function(SemaphoreHandle_t lock, void *stack, size_t stack_size, shared_stack_function function) { assert(lock); assert(stack); assert(stack_size > 0 && stack_size >= CONFIG_ESP_MINIMAL_SHARED_STACK_SIZE); assert(function); xSemaphoreTake(lock, portMAX_DELAY); portENTER_CRITICAL(&xtensa_shared_stack_spinlock); xtensa_shared_stack_function_done = false; esp_switch_stack_setup(stack, stack_size); xtensa_shared_stack_callback = function; portEXIT_CRITICAL(&xtensa_shared_stack_spinlock); setjmp(xtensa_shared_stack_env); if (!xtensa_shared_stack_function_done) { esp_shared_stack_invoke_function(); }{...} portENTER_CRITICAL(&xtensa_shared_stack_spinlock); StaticTask_t *current = (StaticTask_t *)xTaskGetCurrentTaskHandle(); //Restore current task stack: current->pxDummy6 = (StackType_t *)current_task_stack; #if CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK vPortSetStackWatchpoint(current->pxDummy6); #endif portEXIT_CRITICAL(&xtensa_shared_stack_spinlock); xSemaphoreGive(lock); }{ ... }
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