esp-idf/components/xtensa/expression_with_stack_xtensa.c

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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 <esp_expression_with_stack.h>
#include <freertos/xtensa_rtos.h>
#include <freertos/xtensa_context.h>
StackType_t * esp_switch_stack_setup(StackType_t *stack, size_t stack_size)
{
#if CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK
int watchpoint_place = (((int)stack + 31) & ~31);
#endif
StackType_t *top_of_stack = (StackType_t *)&stack[0] +
((stack_size * sizeof(StackType_t)) / sizeof(StackType_t));
//Align stack to a 16byte boundary, as required by CPU specific:
top_of_stack = (StackType_t *)(((UBaseType_t)(top_of_stack - 31) -
ALIGNUP(0x10, sizeof(XtSolFrame) )) &
~0xf);
//Fake stack frame to do not break the backtrace
XtSolFrame *frame = (XtSolFrame *)top_of_stack;
frame->a0 = 0;
frame->a1 = (UBaseType_t)top_of_stack;
#if CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK
esp_set_watchpoint(2, (char*)watchpoint_place, 32, ESP_WATCHPOINT_STORE);
#endif
return top_of_stack;
}