| /* Native-dependent code for OpenBSD/i386. |
| Copyright 2002 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| |
| #include <sys/param.h> |
| #include <sys/sysctl.h> |
| |
| /* Prevent warning from -Wmissing-prototypes. */ |
| void _initialize_i386obsd_nat (void); |
| |
| void |
| _initialize_i386obsd_nat (void) |
| { |
| /* OpenBSD provides a vm.psstrings sysctl that we can use to locate |
| the sigtramp. That way we can still recognize a sigtramp if its |
| location is changed in a new kernel. This is especially |
| important for OpenBSD, since it uses a different memory layout |
| than NetBSD, yet we cannot distinguish between the two. |
| |
| Of course this is still based on the assumption that the sigtramp |
| is placed directly under the location where the program arguments |
| and environment can be found. */ |
| #ifdef VM_PSSTRINGS |
| { |
| struct _ps_strings _ps; |
| int mib[2]; |
| size_t len; |
| |
| extern CORE_ADDR i386obsd_sigtramp_start; |
| extern CORE_ADDR i386obsd_sigtramp_end; |
| |
| mib[0] = CTL_VM; |
| mib[1] = VM_PSSTRINGS; |
| len = sizeof (_ps); |
| if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0) |
| { |
| i386obsd_sigtramp_start = (CORE_ADDR)_ps.val - 128; |
| i386obsd_sigtramp_end = (CORE_ADDR)_ps.val; |
| } |
| } |
| #endif |
| } |