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46d7de19 | 1 | /* brk system call for Linux/m68k. |
7cc27f44 UD |
2 | Copyright (C) 1996, 1997 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. | |
46d7de19 | 4 | |
7cc27f44 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
46d7de19 | 9 | |
7cc27f44 UD |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
46d7de19 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
46d7de19 RM |
19 | |
20 | #include <errno.h> | |
21 | #include <unistd.h> | |
22 | #include <sysdep.h> | |
23 | ||
7cc27f44 UD |
24 | void *__curbrk = 0; |
25 | ||
26 | /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt | |
27 | to work around different old braindamage in the old Linux/x86 ELF | |
28 | dynamic linker. Sigh. */ | |
29 | weak_alias (__curbrk, ___brk_addr) | |
46d7de19 RM |
30 | |
31 | int | |
32 | __brk (void *addr) | |
33 | { | |
34 | void *newbrk; | |
35 | ||
36 | { | |
37 | register long d0 __asm__ ("%d0"); | |
38 | ||
39 | asm ("move%.l %2, %%d1\n" | |
40 | "trap #0" /* Perform the system call. */ | |
41 | : "=d" (d0) | |
42 | : "0" (SYS_ify (brk)), "g" (addr) | |
43 | : "%d0", "%d1"); | |
44 | newbrk = (void *) d0; | |
45 | } | |
46 | __curbrk = newbrk; | |
47 | ||
48 | if (newbrk < addr) | |
49 | { | |
c4029823 | 50 | __set_errno (ENOMEM); |
46d7de19 RM |
51 | return -1; |
52 | } | |
53 | ||
54 | return 0; | |
55 | } | |
56 | weak_alias (__brk, brk) |