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