diff options
Diffstat (limited to 'sysdeps/i386/elf/bsd-setjmp.S')
| -rw-r--r-- | sysdeps/i386/elf/bsd-setjmp.S | 71 |
1 files changed, 70 insertions, 1 deletions
diff --git a/sysdeps/i386/elf/bsd-setjmp.S b/sysdeps/i386/elf/bsd-setjmp.S index 1417270201..4968ded11c 100644 --- a/sysdeps/i386/elf/bsd-setjmp.S +++ b/sysdeps/i386/elf/bsd-setjmp.S @@ -1 +1,70 @@ -/* We don't need any code here since the setjmp.S file contains it. */ +/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version. + Copyright (C) 1995, 1996, 1997, 2000, 2001 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> +#include "bp-sym.h" +#include "bp-asm.h" + +#define PARMS LINKAGE /* no space for saved regs */ +#define JMPBUF PARMS +#define SIGMSK JMPBUF+PTR_SIZE + +ENTRY (BP_SYM (setjmp)) + /* 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. */ + ENTER + + movl JMPBUF(%esp), %eax + CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE) + + /* Save registers. */ + movl %ebx, (JB_BX*4)(%eax) + movl %esi, (JB_SI*4)(%eax) + movl %edi, (JB_DI*4)(%eax) + leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ + movl %ecx, (JB_SP*4)(%eax) + movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */ + movl %ecx, (JB_PC*4)(%eax) + LEAVE /* pop frame pointer to prepare for tail-call. */ + movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */ + + /* Call __sigjmp_save. */ + pushl $1 + pushl 8(%esp) +#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 here2 +here2: popl %ecx + addl $_GLOBAL_OFFSET_TABLE_+[.-here2], %ecx + movl C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOT)(%ecx), %ecx + call *%ecx +#else + call BP_SYM (__sigjmp_save) +#endif + popl %ecx + popl %edx + ret +END (BP_SYM (setjmp)) |