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1 | /* brk system call for Linux/MIPS. | |
2 | Copyright (C) 2000, 2005, 2006 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
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. | |
9 | ||
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
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. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <unistd.h> | |
22 | #include <sysdep.h> | |
23 | ||
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) | |
30 | ||
31 | int | |
32 | __brk (void *addr) | |
33 | { | |
34 | void *newbrk; | |
35 | ||
36 | { | |
37 | register long int res __asm__ ("$2"); | |
38 | ||
39 | asm ("move\t$4,%2\n\t" | |
40 | "li\t%0,%1\n\t" | |
41 | "syscall" /* Perform the system call. */ | |
42 | : "=r" (res) | |
43 | : "I" (SYS_ify (brk)), "r" (addr) | |
44 | : "$4", "$7", __SYSCALL_CLOBBERS); | |
45 | newbrk = (void *) res; | |
46 | } | |
47 | __curbrk = newbrk; | |
48 | ||
49 | if (newbrk < addr) | |
50 | { | |
51 | __set_errno (ENOMEM); | |
52 | return -1; | |
53 | } | |
54 | ||
55 | return 0; | |
56 | } | |
57 | weak_alias (__brk, brk) |