1 | /* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'. i386 version. |
2 | Copyright (C) 1994-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
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. |
9 | |
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. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | /* This just does a tail-call to `__sigsetjmp (ARG, 0)'. |
20 | We cannot do it in C because it must be a tail-call, so frame-unwinding |
21 | in setjmp doesn't clobber the state restored by longjmp. */ |
22 | |
23 | #include <sysdep.h> |
24 | #include <pointer_guard.h> |
25 | #include <jmpbuf-offsets.h> |
26 | #include <stap-probe.h> |
27 | |
28 | #define PARMS 4 /* no space for saved regs */ |
29 | #define JMPBUF PARMS |
30 | #define SIGMSK JMPBUF+4 |
31 | |
32 | ENTRY (_setjmp) |
33 | |
34 | xorl %eax, %eax |
35 | movl JMPBUF(%esp), %edx |
36 | |
37 | /* Save registers. */ |
38 | movl %ebx, (JB_BX*4)(%edx) |
39 | movl %esi, (JB_SI*4)(%edx) |
40 | movl %edi, (JB_DI*4)(%edx) |
41 | leal JMPBUF(%esp), %ecx /* Save SP as it will be after we return. */ |
42 | #ifdef PTR_MANGLE |
43 | PTR_MANGLE (%ecx) |
44 | #endif |
45 | movl %ecx, (JB_SP*4)(%edx) |
46 | movl 0(%esp), %ecx /* Save PC we are returning to now. */ |
47 | LIBC_PROBE (setjmp, 3, 4@%edx, -4@$0, 4@%ecx) |
48 | #ifdef PTR_MANGLE |
49 | PTR_MANGLE (%ecx) |
50 | #endif |
51 | movl %ecx, (JB_PC*4)(%edx) |
52 | movl %ebp, (JB_BP*4)(%edx) /* Save caller's frame pointer. */ |
53 | |
54 | movl %eax, JB_SIZE(%edx) /* No signal mask set. */ |
55 | ret |
56 | END (_setjmp) |
57 | libc_hidden_def (_setjmp) |
58 | |