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/* Copyright (C) 1998, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper, <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _LINUX_I386_I686_SYSDEP_H
#define _LINUX_I386_I686_SYSDEP_H 1
/* There is some commonality. */
#include <sysdeps/unix/sysv/linux/i386/sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
/* We define special versions of the error handler code to match the i686's
deep branch prediction mechanism. */
#ifdef PIC
# undef SYSCALL_ERROR_HANDLER
/* Store (- %eax) into errno through the GOT. */
# ifdef _LIBC_REENTRANT
# ifndef HAVE_HIDDEN
# define SETUP_PIC_REG \
call 1f; \
.subsection 1; \
1:movl (%esp), %ebx; \
ret; \
.previous
# else
# define SETUP_PIC_REG \
.section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits; \
.globl __i686.get_pc_thunk.bx; \
.hidden __i686.get_pc_thunk.bx; \
.type __i686.get_pc_thunk.bx,@function; \
__i686.get_pc_thunk.bx: \
movl (%esp), %ebx; \
ret; \
.previous; \
call __i686.get_pc_thunk.bx
# endif
# define SYSCALL_ERROR_HANDLER \
0:pushl %ebx; \
SETUP_PIC_REG; \
addl $_GLOBAL_OFFSET_TABLE_, %ebx; \
xorl %edx, %edx; \
subl %eax, %edx; \
pushl %edx; \
PUSH_ERRNO_LOCATION_RETURN; \
call BP_SYM (__errno_location)@PLT; \
POP_ERRNO_LOCATION_RETURN; \
popl %ecx; \
popl %ebx; \
movl %ecx, (%eax); \
orl $-1, %eax; \
jmp L(pseudo_end);
/* A quick note: it is assumed that the call to `__errno_location' does
not modify the stack! */
# else
# ifndef HAVE_HIDDEN
# define SETUP_PIC_REG \
call 1f; \
.subsection 1; \
1:movl (%esp), %ecx; \
ret; \
.previous
# else
# define SETUP_PIC_REG \
.section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits; \
.globl __i686.get_pc_thunk.cx; \
.hidden __i686.get_pc_thunk.cx; \
.type __i686.get_pc_thunk.cx,@function; \
__i686.get_pc_thunk.cx: \
movl (%esp), %ecx; \
ret; \
.previous; \
call __i686.get_pc_thunk.cx
# endif
# define SYSCALL_ERROR_HANDLER \
0:SETUP_PIC_REG; \
addl $_GLOBAL_OFFSET_TABLE_, %ecx; \
xorl %edx, %edx; \
subl %eax, %edx; \
movl errno@GOT(%ecx), %ecx; \
movl %edx, (%ecx); \
orl $-1, %eax; \
jmp L(pseudo_end);
# endif /* _LIBC_REENTRANT */
#endif /* PIC */
#endif /* linux/i386/i686/sysdep.h */
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