1 /* brk system call for Linux/i386.
2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
24 /* This must be initialized data because commons can't have aliases. */
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
30 weak_alias (__curbrk, ___brk_addr)
35 void *newbrk, *scratch;
37 asm ("movl %%ebx, %1\n" /* Save %ebx in scratch register. */
38 "movl %3, %%ebx\n" /* Put ADDR in %ebx to be syscall arg. */
39 "int $0x80 # %2\n" /* Perform the system call. */
40 "movl %1, %%ebx\n" /* Restore %ebx from scratch register. */
41 : "=a" (newbrk), "=r" (scratch)
42 : "0" (SYS_ify (brk)), "g" (addr));
54 weak_alias (__brk, brk)