| /* |
| * 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; |
| } |
