54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
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/*
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* Copyright (c) 2015, Freescale Semiconductor, Inc.
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* Copyright 2016-2019 NXP
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#if defined(__GNUC__)
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#include <stdio.h>
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#include <errno.h>
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#endif
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#if defined(__GNUC__)
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/*!
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* @brief Function to override ARMGCC default function _sbrk
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*
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* _sbrk is called by malloc. ARMGCC default _sbrk compares "SP" register and
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* heap end, if heap end is larger than "SP", then _sbrk returns error and
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* memory allocation failed. This function changes to compare __HeapLimit with
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* heap end.
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*/
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caddr_t _sbrk(int incr);
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caddr_t _sbrk(int incr)
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{
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extern char end __asm("end");
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extern char heap_limit __asm("__HeapLimit");
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static char *heap_end;
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char *prev_heap_end;
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caddr_t ret;
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if (heap_end == NULL)
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{
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heap_end = &end;
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}
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prev_heap_end = heap_end;
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if ((unsigned int)heap_end + (unsigned int)incr > (unsigned int)(&heap_limit))
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{
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errno = ENOMEM;
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ret = (caddr_t)-1;
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}
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else
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{
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heap_end = (char *)((unsigned int)heap_end + (unsigned int)incr);
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ret = (caddr_t)prev_heap_end;
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}
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return ret;
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}
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#endif
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