sysdeps/unix/sysv/linux/i386/mmap.S

   1 /* Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <sysdep.h>
  20
  21         .text
  22
  23 ENTRY (__mmap)
  24
  25         /* Save registers.  */
  26         movl %ebx, %edx
  27
  28         movl $SYS_ify(mmap), %eax       /* System call number in %eax.  */
  29
  30         lea 4(%esp), %ebx               /* Address of args is 1st arg.  */
  31
  32         /* Do the system call trap.  */
  33         int $0x80
  34
  35         /* Restore registers.  */
  36         movl %edx, %ebx
  37
  38         /* If 0 > %eax > -4096 there was an error.  */
  39         cmpl $-4096, %eax
  40         ja SYSCALL_ERROR_LABEL
  41
  42         /* Successful; return the syscall's value.  */
  43 L(pseudo_end):
  44         ret
  45
  46 PSEUDO_END (__mmap)
  47
  48 weak_alias (__mmap, mmap)
  49 weak_alias (__mmap, mmap64)