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

   1 /* Copyright (C) 1995 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <sysdep.h>
  20
  21         .text
  22         SYSCALL_ERROR_HANDLER
  23
  24 ENTRY (__mmap)
  25
  26         /* Save registers.  */
  27         movl %ebx, %edx
  28
  29         movl $SYS_ify(mmap), %eax       /* System call number in %eax.  */
  30
  31         lea 4(%esp), %ebx               /* Address of args is 1st arg.  */
  32
  33         /* Do the system call trap.  */
  34         int $0x80
  35
  36         /* Restore registers.  */
  37         movl %edx, %ebx
  38
  39         /* %eax is < 0 if there was an error.  */
  40         testl %eax, %eax
  41         jl syscall_error
  42
  43         /* Successful; return the syscall's value.  */
  44         ret
  45
  46 weak_alias (__mmap, mmap)