diff options
Diffstat (limited to 'sysdeps/i386/elf/bsd-setjmp.S')
| -rw-r--r-- | sysdeps/i386/elf/bsd-setjmp.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/sysdeps/i386/elf/bsd-setjmp.S b/sysdeps/i386/elf/bsd-setjmp.S new file mode 100644 index 0000000000..72a85b18e1 --- /dev/null +++ b/sysdeps/i386/elf/bsd-setjmp.S @@ -0,0 +1,78 @@ +/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'. i386 version. + Copyright (C) 1995-1997,2000,2001,2002,2003 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; 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 __i686.get_pc_thunk.cx + addl $_GLOBAL_OFFSET_TABLE_, %ecx + leal C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOTOFF)(%ecx), %ecx + call *%ecx +#else + call BP_SYM (__sigjmp_save) +#endif + popl %ecx + popl %edx + ret +END (BP_SYM (setjmp)) + + .section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits + .globl __i686.get_pc_thunk.cx + .hidden __i686.get_pc_thunk.cx + .type __i686.get_pc_thunk.cx,@function +__i686.get_pc_thunk.cx: + movl (%esp), %ecx + ret + .size __i686.get_pc_thunk.cx, . - __i686.get_pc_thunk.cx |