1 /* setjmp for i386, ELF version.
2 Copyright (C) 1995, 1996, 1997 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 Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 #include <bits/setjmp.h>
24 /* We include the BSD entry points here as well but we make
27 .weak C_SYMBOL_NAME (setjmp)
28 popl %eax /* Pop return PC. */
29 popl %ecx /* Pop jmp_buf argument. */
30 pushl $1 /* Push second argument of zero. */
31 pushl %ecx /* Push back first argument. */
32 pushl %eax /* Push back return PC. */
36 /* Binary compatibility entry point. */
38 .weak C_SYMBOL_NAME (_setjmp)
40 popl %eax /* Pop return address. */
41 popl %ecx /* Pop jmp_buf. */
42 pushl $0 /* Push zero argument. */
43 pushl %ecx /* Push jmp_buf. */
44 pushl %eax /* Push back return address. */
47 movl 4(%esp), %eax /* User's jmp_buf in %eax. */
49 movl %ebx, (JB_BX*4)(%eax)
50 movl %esi, (JB_SI*4)(%eax)
51 movl %edi, (JB_DI*4)(%eax)
52 movl %ebp, (JB_BP*4)(%eax)
53 leal 4(%esp), %ecx /* Save SP as it will be after we return. */
54 movl %ecx, (JB_SP*4)(%eax)
55 movl 0(%esp), %ecx /* Save PC we are returning to now. */
56 movl %ecx, (JB_PC*4)(%eax)
58 /* Make a tail call to __sigjmp_save; it takes the same args. */
60 /* We cannot use the PLT, because it requires that %ebx be set, but
61 we can't save and restore our caller's value. Instead, we do an
62 indirect jump through the GOT, using for the temporary register
63 %ecx, which is call-clobbered. */
66 addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
67 movl C_SYMBOL_NAME(__sigjmp_save@GOT)(%ecx), %ecx