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67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
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/*
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* Copyright (c) 2012, STMicroelectronics.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE 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
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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*/
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/*---------------------------------------------------------------------------*/
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/*
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* Function implementation taken and adapted from:
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* cpu/stm32w108/e_stdio/src/syscalls.c
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*/
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/*---------------------------------------------------------------------------*/
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#include <errno.h>
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#include <stdio.h>
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/*---------------------------------------------------------------------------*/
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extern int errno;
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/*---------------------------------------------------------------------------*/
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/* Register name faking - works in collusion with the linker. */
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register char *stack_ptr asm ("sp");
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/*---------------------------------------------------------------------------*/
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caddr_t
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_sbrk(int incr)
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{
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extern char end; /* Defined by the linker */
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static char *heap_end;
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char *prev_heap_end;
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if(heap_end == 0) {
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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(heap_end + incr > stack_ptr) {
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_write(1, "Heap and stack collision\n", 25);
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/*abort ();*/
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errno = ENOMEM;
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return (caddr_t)-1;
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}
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heap_end += incr;
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return (caddr_t)prev_heap_end;
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}
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/*---------------------------------------------------------------------------*/
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