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Add support of separate memories for heap and stack region swith the use of TWO_RAM_REGIONS define

pull/6172/head
adustm 2018-02-20 10:32:49 +01:00
parent 02b2b01a83
commit f551255ded
1 changed files with 68 additions and 0 deletions
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targets/TARGET_STM/TARGET_STM32L4/l4_retarget.c Normal file
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/**
******************************************************************************
* @file l4_retarget.c
* @author MCD Application Team
* @brief CMSIS Cortex-M4 Core Peripheral Access Layer Source File for STM32L475xG
******************************************************************************
* @attention
*
* <h2><center>&copy; COPYRIGHT(c) 2018 STMicroelectronics</center></h2>
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
#if defined(TWO_RAM_REGIONS)
#if defined(TOOLCHAIN_GCC_ARM) || defined(TOOLCHAIN_GCC_CR)
#include <errno.h>
#include "stm32l4xx.h"
extern uint32_t __mbed_sbrk_start;
extern uint32_t __mbed_krbs_start;
#define STM32L4_HEAP_ALIGN 32
#define STM32L4_ALIGN_UP(X, ALIGN) (((X) + (ALIGN) - 1) & ~((ALIGN) - 1))
/**
* The default implementation of _sbrk() (in platform/mbed_retarget.cpp) for GCC_ARM requires one-region model (heap and
* stack share one region), which doesn't fit two-region model (heap and stack are two distinct regions), for example,
* STM32L475xG locates heap on SRAM1 and stack on SRAM2.
* Define __wrap__sbrk() to override the default _sbrk(). It is expected to get called through gcc
* hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk().
*/
void *__wrap__sbrk(int incr)
{
static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;
uint32_t heap_ind_old = STM32L4_ALIGN_UP(heap_ind, STM32L4_HEAP_ALIGN);
uint32_t heap_ind_new = STM32L4_ALIGN_UP(heap_ind_old + incr, STM32L4_HEAP_ALIGN);
if (heap_ind_new > &__mbed_krbs_start) {
errno = ENOMEM;
return (void *) -1;
}
heap_ind = heap_ind_new;
return (void *) heap_ind_old;
}
#endif /* GCC_ARM toolchain */
#endif /* TWO_RAM_REGIONS */