sysdeps/unix/sysv/linux/i386/sysdep.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 /* Because the Linux version is in fact i386/ELF and the start.? file
  20    for this system (sysdeps/i386/elf/start.S) is also used by The Hurd
  21    and therefore this files must not contain the definition of the
  22    `errno' variable (I don't know why, ask Roland), we have to define
  23    it somewhere else.
  24
  25    ...and this place is here.  */
  26         .bss
  27         .globl errno
  28         .type errno,@object
  29         .size errno,4
  30 errno:  .space 4
  31         .globl _errno
  32         .type _errno,@object
  33 _errno = errno  /* This name is expected by hj libc.so.5 startup code.  */
  34         .text
  35
  36 /* The following code is not used at all in the shared library.
  37    The PIC system call stubs set errno themselves.  */
  38
  39 #ifndef PIC
  40
  41 /* The syscall stubs jump here when they detect an error.
  42    The code for Linux is almost identical to the canonical Unix/i386
  43    code, except that the error number in %eax is negated.  */
  44
  45 .globl __syscall_error
  46 __syscall_error:
  47         negl %eax
  48
  49 #define __syscall_error __syscall_error_1
  50 #include <sysdeps/unix/i386/sysdep.S>
  51
  52 #endif