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baadce09 MK |
1 | /* Native-dependent code for OpenBSD/i386. |
2 | Copyright 2002 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "defs.h" | |
22 | ||
23 | #include <sys/param.h> | |
24 | #include <sys/sysctl.h> | |
25 | ||
26 | /* Prevent warning from -Wmissing-prototypes. */ | |
e5e4acad | 27 | void _initialize_i386obsd_nat (void); |
baadce09 MK |
28 | |
29 | void | |
30 | _initialize_i386obsd_nat (void) | |
31 | { | |
32 | /* OpenBSD provides a vm.psstrings sysctl that we can use to locate | |
33 | the sigtramp. That way we can still recognize a sigtramp if its | |
34 | location is changed in a new kernel. This is especially | |
35 | important for OpenBSD, since it uses a different memory layout | |
36 | than NetBSD, yet we cannot distinguish between the two. | |
37 | ||
38 | Of course this is still based on the assumption that the sigtramp | |
39 | is placed directly under the location where the program arguments | |
40 | and environment can be found. */ | |
41 | #ifdef VM_PSSTRINGS | |
42 | { | |
43 | struct _ps_strings _ps; | |
44 | int mib[2]; | |
45 | size_t len; | |
46 | ||
47 | extern CORE_ADDR i386nbsd_sigtramp_start; | |
48 | extern CORE_ADDR i386nbsd_sigtramp_end; | |
49 | ||
50 | mib[0] = CTL_VM; | |
51 | mib[1] = VM_PSSTRINGS; | |
52 | len = sizeof (_ps); | |
53 | if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0) | |
54 | { | |
55 | i386nbsd_sigtramp_start = (CORE_ADDR)_ps.val - 128; | |
56 | i386nbsd_sigtramp_end = (CORE_ADDR)_ps.val; | |
57 | } | |
58 | } | |
59 | #endif | |
60 | } |