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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [m68k/] [cf-sbrk.c] - Rev 300
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/* * cf-sbrk.c -- * * Copyright (c) 2006 CodeSourcery Inc * * The authors hereby grant permission to use, copy, modify, distribute, * and license this software and its documentation for any purpose, provided * that existing copyright notices are retained in all copies and that this * notice is included verbatim in any distributions. No written agreement, * license, or royalty fee is required for any of the authorized uses. * Modifications to this software may be copyrighted by their authors * and need not follow the licensing terms described here, provided that * the new terms are clearly indicated on the first page of each file where * they apply. */ #include <errno.h> /* * sbrk -- changes heap size size. Get nbytes more * RAM. We just increment a pointer in what's * left of memory on the board. */ extern char __end[] __attribute__ ((aligned (4))); /* End of heap, if non NULL. */ extern void *__heap_limit; void * sbrk (int nbytes) { static char *heap = __end; char *end = __heap_limit; char *base = heap; char *new_heap = heap + nbytes; if (!end) { /* Use sp - 256 as the heap limit. */ __asm__ __volatile__ ("move.l %/sp,%0" : "=r"(end)); end -= 256; } if (nbytes < 0 || (long)(end - new_heap) < 0) { errno = ENOMEM; return (void *)-1; } heap = new_heap; return base; }
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