mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-02-24 01:29:34 +08:00
e9375a96b3
* m68k/Makefile.in (CF_CRT0): Rename to CF_CRT0S, separate hosted & unhosted versions. (CF_OBJS): Add cf-isv.o. (CF_SOURCES): Add cf-isv.S. (cf-hosted-crt0.o, cf-unhosted-crt0.o): New targets. * m68k/cf-isv.S: New, broken out of ... * m68k/cf-crt0.S: ... here. Add HOSTED & UNHOSTED differences. * m68k/cf-crt1.c (__start1): Add heap_limit argument. (__heap_limit): Define. * m68k/cf-sbrk.c (__heap_limit): Declare. (sbrk): Adjust for __heap_limit. * m68k/cf.sc: Use different crt0's for hosted & unhosted. Install a separate isv.o file. * m68k/io.h (HOSTED_PUTCHAR): Replace with ... (HOSTED_INIT_SIM): ... this.
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
|
|
* 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;
|
|
}
|