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, see
17 <http://www.gnu.org/licenses/>. */
18
19 #include <errno.h>
20 #include <unistd.h>
21 #include <sys/syscall.h>
22
23 void *__curbrk attribute_hidden = 0;
24
brk(void * addr)25 int brk (void *addr)
26 {
27 void *newbrk;
28
29 {
30 register long int res __asm__ ("$2");
31
32 __asm__ ("move\t$4,%2\n\t"
33 "li\t%0,%1\n\t"
34 "syscall" /* Perform the system call. */
35 : "=r" (res)
36 : "I" (__NR_brk), "r" (addr)
37 : "$4", "$7", __SYSCALL_CLOBBERS);
38 newbrk = (void *) res;
39 }
40 __curbrk = newbrk;
41
42 if (newbrk < addr)
43 {
44 __set_errno (ENOMEM);
45 return -1;
46 }
47
48 return 0;
49 }
50 libc_hidden_def(brk)
51