sysdeps/unix/sysv/linux/m68k/mmap.S

   1 /* Copyright (C) 1996-2015 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19
  20         .text
  21 ENTRY (__mmap)
  22
  23         move.l #SYS_ify (mmap), %d0     /* System call number in %d0.  */
  24
  25         lea 4(%sp), %a0                 /* Address of args is 1st arg.  */
  26         move.l %a0, %d1
  27
  28         /* Do the system call trap.  */
  29         trap #0
  30
  31         /* Kludge: negative numbers are among the legal return values.
  32            If %d0 is between -4096 and 0 then there was an error.  */
  33         cmp.l #-4096, %d0
  34         jhi SYSCALL_ERROR_LABEL
  35
  36         /* Successful; return the syscall's value.  Copy it to %a0 because
  37            mmap is declared to return a pointer.  */
  38         move.l %d0, %a0
  39         rts
  40 PSEUDO_END (__mmap)
  41
  42 weak_alias (__mmap, mmap)