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fd26970f | 1 | /* brk system call for Linux/SPARC. |
489b7d4b | 2 | Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
fd26970f UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx) | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Library General Public License as | |
8 | published by the Free Software Foundation; either version 2 of the | |
9 | License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Library General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Library General Public | |
17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include <errno.h> | |
22 | #include <unistd.h> | |
23 | #include <sysdep.h> | |
24 | ||
25 | /* This must be initialized data because commons can't have aliases. */ | |
26 | void *__curbrk = 0; | |
27 | ||
28 | /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt | |
29 | to work around different old braindamage in the old Linux ELF dynamic | |
30 | linker. */ | |
31 | weak_alias (__curbrk, ___brk_addr) | |
32 | ||
33 | int | |
34 | __brk (void *addr) | |
35 | { | |
9c4c0024 | 36 | void *newbrk; |
fd26970f | 37 | |
489b7d4b RH |
38 | { |
39 | register void *o0 __asm__("%o0") = addr; | |
40 | register int g1 __asm__("%g1") = __NR_brk; | |
41 | __asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc"); | |
42 | newbrk = o0; | |
43 | } | |
fd26970f UD |
44 | |
45 | __curbrk = newbrk; | |
46 | ||
47 | if (newbrk < addr) | |
48 | { | |
49 | __set_errno (ENOMEM); | |
50 | return -1; | |
51 | } | |
52 | ||
53 | return 0; | |
54 | } | |
55 | weak_alias (__brk, brk) |