/* 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 __setjmp; .type __setjmp,@function .align 4; \ __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. */ .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) /* 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 jmp *%ecx #else jmp __sigjmp_save #endif .size __sigsetjmp,.-__sigsetjmp;