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glibc/sysdeps/i386/setjmp.S
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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 |