/* 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. */ extern void *__curbrk; libc_hidden_proto(__curbrk) void *__curbrk = NULL; libc_hidden_data_def(__curbrk) libc_hidden_proto(brk) 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)