| /* brk system call for Linux/VAX. |
| Copyright (C) 2000, 2005 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/syscall.h> |
| |
| /* This must be initialized data because commons can't have aliases. */ |
| void *__curbrk attribute_hidden = NULL; |
| |
| int |
| brk (void *addr) |
| { |
| register unsigned long int result __asm__ ("%%r0"); |
| |
| __asm__ ( |
| " pushl %%ap \n" /* Start frame */ |
| " pushl %2 \n" /* New top address we wish to get */ |
| " pushl $1 \n" /* One argument */ |
| " movl %%sp, %%ap \n" /* Finish frame */ |
| " chmk %1 \n" /* Perform the system call */ |
| " addl2 $8, %%sp \n" /* Remove pushed arg */ |
| " movl (%%sp)+, %%ap \n" /* Get back %AP */ |
| : "=r" (result) |
| : "0" (__NR_brk), |
| "g" (addr)); |
| |
| if ((void *) result < addr) { |
| __set_errno (ENOMEM); |
| return -1; |
| } else |
| __curbrk = (void *) result; |
| |
| return 0; |
| } |
| libc_hidden_def(brk) |
| |