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/* setjmp for i386, ELF version.
Copyright (C) 1995, 1996, 1997, 2000 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. */
#include <sysdep.h>
#define _ASM
#define _SETJMP_H
#include <bits/setjmp.h>
/* We include the BSD entry points here as well but we make
them weak. */
ENTRY (setjmp)
.weak C_SYMBOL_NAME (setjmp)
popl %eax /* Pop return PC. */
popl %ecx /* Pop jmp_buf argument. */
pushl $1 /* Push second argument of zero. */
pushl %ecx /* Push back first argument. */
pushl %eax /* Push back return PC. */
/* Note that we have to use a non-exported symbol in the next
jump since otherwise gas will emit it as a jump through the
PLT which is what we cannot use here. */
jmp .Linternal_sigsetjmp
END (setjmp)
/* Binary compatibility entry point. */
ENTRY (_setjmp)
.weak C_SYMBOL_NAME (_setjmp)
ENTRY (__setjmp)
popl %eax /* Pop return address. */
popl %ecx /* Pop jmp_buf. */
pushl $0 /* Push zero argument. */
pushl %ecx /* Push jmp_buf. */
pushl %eax /* Push back return address. */
ENTRY (__sigsetjmp)
.Linternal_sigsetjmp = __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
END (__sigsetjmp)
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