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fd26970f | 1 | /* brk system call for Linux/SPARC. |
688903eb | 2 | Copyright (C) 1995-2018 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 | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
fd26970f UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
fd26970f | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
fd26970f UD |
19 | |
20 | #include <errno.h> | |
21 | #include <unistd.h> | |
22 | #include <sysdep.h> | |
23 | ||
24 | /* This must be initialized data because commons can't have aliases. */ | |
25 | void *__curbrk = 0; | |
26 | ||
27 | /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt | |
28 | to work around different old braindamage in the old Linux ELF dynamic | |
29 | linker. */ | |
30 | weak_alias (__curbrk, ___brk_addr) | |
31 | ||
32 | int | |
33 | __brk (void *addr) | |
34 | { | |
9c4c0024 | 35 | void *newbrk; |
fd26970f | 36 | |
489b7d4b RH |
37 | { |
38 | register void *o0 __asm__("%o0") = addr; | |
39 | register int g1 __asm__("%g1") = __NR_brk; | |
40 | __asm ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc"); | |
41 | newbrk = o0; | |
42 | } | |
fd26970f UD |
43 | |
44 | __curbrk = newbrk; | |
45 | ||
46 | if (newbrk < addr) | |
47 | { | |
48 | __set_errno (ENOMEM); | |
49 | return -1; | |
50 | } | |
51 | ||
52 | return 0; | |
53 | } | |
54 | weak_alias (__brk, brk) |