sysdeps/unix/i386/sysdep.S

   1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 2000 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdep.h>
  20 #define _ERRNO_H
  21 #include <bits/errno.h>
  22 #include <bp-asm.h>
  23 #include <bp-sym.h>
  24
  25 .globl C_SYMBOL_NAME(errno)
  26 .globl syscall_error
  27
  28 #undef syscall_error
  29 #ifdef NO_UNDERSCORES
  30 __syscall_error:
  31 #else
  32 syscall_error:
  33 #endif
  34 #if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
  35         /* We translate the system's EWOULDBLOCK error into EAGAIN.
  36            The GNU C library always defines EWOULDBLOCK==EAGAIN.
  37            EWOULDBLOCK_sys is the original number.  */
  38         cmpl $EWOULDBLOCK_sys, %eax /* Is it the old EWOULDBLOCK?  */
  39         jne notb                /* Branch if not.  */
  40         movl $EAGAIN, %eax      /* Yes; translate it to EAGAIN.  */
  41 notb:
  42 #endif
  43 #ifndef PIC
  44 # ifndef _LIBC_REENTRANT
  45         movl %eax, C_SYMBOL_NAME(errno)
  46 # else
  47         pushl %eax
  48         PUSH_ERRNO_LOCATION_RETURN
  49         call BP_SYM (__errno_location)
  50         POP_ERRNO_LOCATION_RETURN
  51         popl %ecx
  52         movl %ecx, (%eax)
  53 # endif
  54 #else
  55         /* The caller has pushed %ebx and then set it up to
  56            point to the GOT before calling us through the PLT.  */
  57 # ifndef _LIBC_REENTRANT
  58         movl C_SYMBOL_NAME(errno@GOT)(%ebx), %ecx
  59
  60         /* Pop %ebx value saved before jumping here.  */
  61         popl %ebx
  62         movl %eax, (%ecx)
  63 # else
  64         pushl %eax
  65         PUSH_ERRNO_LOCATION_RETURN
  66         call C_SYMBOL_NAME (BP_SYM (__errno_location)@PLT)
  67         POP_ERRNO_LOCATION_RETURN
  68         popl %ecx
  69         /* Pop %ebx value saved before jumping here.  */
  70         popl %ebx
  71         movl %ecx, (%eax)
  72 # endif
  73 #endif
  74         movl $-1, %eax
  75         ret
  76
  77 #undef  __syscall_error
  78 END (__syscall_error)