| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* brk system call for Linux/VAX. |
| 2 | Copyright (C) 2000, 2005 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 | /* This must be initialized data because commons can't have aliases. */ |
| 25 | void *__curbrk attribute_hidden = NULL; |
| 26 | |
| 27 | int |
| 28 | brk (void *addr) |
| 29 | { |
| 30 | register unsigned long int result __asm__ ("%%r0"); |
| 31 | |
| 32 | __asm__ ( |
| 33 | " pushl %%ap \n" /* Start frame */ |
| 34 | " pushl %2 \n" /* New top address we wish to get */ |
| 35 | " pushl $1 \n" /* One argument */ |
| 36 | " movl %%sp, %%ap \n" /* Finish frame */ |
| 37 | " chmk %1 \n" /* Perform the system call */ |
| 38 | " addl2 $8, %%sp \n" /* Remove pushed arg */ |
| 39 | " movl (%%sp)+, %%ap \n" /* Get back %AP */ |
| 40 | : "=r" (result) |
| 41 | : "0" (__NR_brk), |
| 42 | "g" (addr)); |
| 43 | |
| 44 | if ((void *) result < addr) { |
| 45 | __set_errno (ENOMEM); |
| 46 | return -1; |
| 47 | } else |
| 48 | __curbrk = (void *) result; |
| 49 | |
| 50 | return 0; |
| 51 | } |
| 52 | libc_hidden_def(brk) |
| 53 | |