1 /* setjmp for i386, ELF version.
2 Copyright (C) 1995,1996,1997,2000,2001,2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <bits/setjmp.h>
27 #define PARMS LINKAGE /* no space for saved regs */
29 #define SIGMSK JMPBUF+PTR_SIZE
31 ENTRY (BP_SYM (__sigsetjmp))
34 movl JMPBUF(%esp), %eax
35 CHECK_BOUNDS_BOTH_WIDE (%eax, JMPBUF(%esp), $JB_SIZE)
38 movl %ebx, (JB_BX*4)(%eax)
39 movl %esi, (JB_SI*4)(%eax)
40 movl %edi, (JB_DI*4)(%eax)
41 leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */
42 movl %ecx, (JB_SP*4)(%eax)
43 movl PCOFF(%esp), %ecx /* Save PC we are returning to now. */
44 movl %ecx, (JB_PC*4)(%eax)
45 LEAVE /* pop frame pointer to prepare for tail-call. */
46 movl %ebp, (JB_BP*4)(%eax) /* Save caller's frame pointer. */
48 /* Make a tail call to __sigjmp_save; it takes the same args. */
50 /* We cannot use the PLT, because it requires that %ebx be set, but
51 we can't save and restore our caller's value. Instead, we do an
52 indirect jump through the GOT, using for the temporary register
53 %ecx, which is call-clobbered. */
55 addl $_GLOBAL_OFFSET_TABLE_, %ecx
56 leal C_SYMBOL_NAME (BP_SYM (__sigjmp_save)@GOTOFF)(%ecx), %ecx
61 jmp BP_SYM (__sigjmp_save)
63 END (BP_SYM (__sigsetjmp))