sysdeps/unix/sysv/linux/ia64/brk.S

   1 /* brk system call for Linux/ia64
   2    Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Stephane Eranian <eranian@hpl.hp.com> and
   5               Jes Sorensen, <Jes.Sorensen@cern.ch>, April 1999.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <sysdep.h>
  23
  24 #include <asm/unistd.h>
  25 #include <asm/errno.h>
  26
  27         .global __curbrk
  28         .data
  29         .align  8
  30 __curbrk:
  31         data8   0
  32
  33 weak_alias (__curbrk, ___brk_addr)
  34
  35 LEAF(__brk)
  36         mov     r15=__NR_brk
  37         break.i __BREAK_SYSCALL
  38         ;;
  39         cmp.ltu p6,p0=ret0,r32  /* r32 is the input register, even though we
  40                                    haven't allocated a frame */
  41         addl    r9=@ltoff(__curbrk),gp
  42         ;;
  43         ld8     r9=[r9]
  44 (p6)    mov     ret0=ENOMEM
  45 (p6)    br.cond.spnt.few __syscall_error
  46         ;;
  47         st8     [r9]=ret0
  48         mov     ret0=0
  49         ret
  50 END(__brk)
  51
  52 weak_alias (__brk, brk)