uclibc-ng/libc/sysdeps/linux/i386/setjmp.S

/* setjmp for i386.
   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#define _ASM
#define _SETJMP_H
#include <bits/setjmp.h>

.globl __sigsetjmp;
.type	 __sigsetjmp,@function
.align 4;                                                               \
__sigsetjmp:
	movl 4(%esp), %eax	/* User's jmp_buf in %eax.  */
     	/* Save registers.  */
	movl %ebx, (JB_BX*4)(%eax)
	movl %esi, (JB_SI*4)(%eax)
	movl %edi, (JB_DI*4)(%eax)
	movl %ebp, (JB_BP*4)(%eax)
	leal 4(%esp), %ecx	/* Save SP as it will be after we return.  */
     	movl %ecx, (JB_SP*4)(%eax)
	movl 0(%esp), %ecx	/* Save PC we are returning to now.  */
     	movl %ecx, (JB_PC*4)(%eax)

	pushl 0x8(%esp) /* save mask */
	pushl 0x8(%esp) /* jump buf */

	/* Make a tail call to __sigjmp_save; it takes the same args.  */
#if defined(PIC)
	/* We cannot use the PLT, because it requires that %ebx be set, but
           we can't save and restore our caller's value.  Instead, we do an
           indirect jump through the GOT, using for the temporary register
           %ecx, which is call-clobbered.  */
	call Lhere
Lhere:
	popl %ecx
	addl $_GLOBAL_OFFSET_TABLE_+[.-Lhere], %ecx
	movl (__sigjmp_save)(%ecx), %ecx
	call *%ecx
#else
	call __sigjmp_save
#endif

	add  $8, %esp
	ret
.size __sigsetjmp,.-__sigsetjmp;

.globl _setjmp;
.type	 _setjmp,@function
.align 4;                                                               \
_setjmp:
	pushl $0		/* Push zero argument.  */
	pushl 0x8(%esp)	/* Push jmp_buf.  */
	call  __sigsetjmp
	add  $8, %esp
	ret
.size _setjmp,.-_setjmp;