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/* setjmp for i386.
Copyright (C) 1995, 1996 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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <sysdep.h>
#define _ASM
#include <jmp_buf.h>
/* Binary compatibility entry point. */
ENTRY (__setjmp)
popl %eax /* Pop return address. */
pushl $0 /* Push zero argument. */
pushl %eax /* Push back return address. */
ENTRY (__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)
/* Make a tail call to __sigjmp_save; it takes the same args. */
#ifdef 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 here
here: popl %ecx
addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx
jmp *%ecx
#else
jmp __sigjmp_save
#endif
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