| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* brk system call for Linux/i386. |
| 2 | Copyright (C) 1995, 1996, 2000 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 <sys/syscall.h> |
| 23 | |
| 24 | |
| 25 | /* This must be initialized data because commons can't have aliases. */ |
| 26 | void *__curbrk attribute_hidden = 0; |
| 27 | |
| 28 | int brk (void *addr) |
| 29 | { |
| 30 | void *newbrk; |
| 31 | |
| 32 | { |
| 33 | register void *o0 __asm__("%o0") = addr; |
| 34 | register int g1 __asm__("%g1") = 17 ; |
| 35 | __asm__ ("t 0x10" : "=r"(o0) : "r"(g1), "0"(o0) : "cc"); |
| 36 | newbrk = o0; |
| 37 | } |
| 38 | |
| 39 | __curbrk = newbrk; |
| 40 | |
| 41 | if (newbrk < addr) |
| 42 | { |
| 43 | __set_errno (ENOMEM); |
| 44 | return -1; |
| 45 | } |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | libc_hidden_def(brk) |