67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2012, STMicroelectronics.
|
|
* All rights reserved.
|
|
*
|
|
* 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 the Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
*
|
|
*/
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Function implementation taken and adapted from:
|
|
* cpu/stm32w108/e_stdio/src/syscalls.c
|
|
*/
|
|
/*---------------------------------------------------------------------------*/
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
/*---------------------------------------------------------------------------*/
|
|
extern int errno;
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Register name faking - works in collusion with the linker. */
|
|
register char *stack_ptr asm ("sp");
|
|
/*---------------------------------------------------------------------------*/
|
|
caddr_t
|
|
_sbrk(int incr)
|
|
{
|
|
extern char end; /* Defined by the linker */
|
|
static char *heap_end;
|
|
char *prev_heap_end;
|
|
|
|
if(heap_end == 0) {
|
|
heap_end = &end;
|
|
}
|
|
prev_heap_end = heap_end;
|
|
if(heap_end + incr > stack_ptr) {
|
|
_write(1, "Heap and stack collision\n", 25);
|
|
/*abort ();*/
|
|
errno = ENOMEM;
|
|
return (caddr_t)-1;
|
|
}
|
|
|
|
heap_end += incr;
|
|
return (caddr_t)prev_heap_end;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|