/* Native-dependent code for OpenBSD/i386. Copyright 2002, 2003, 2004 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> #include "i386-tdep.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; mib[0] = CTL_VM; mib[1] = VM_PSSTRINGS; len = sizeof (_ps); if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0) { i386obsd_sigtramp_start_addr = (u_long) _ps.val - 128; i386obsd_sigtramp_end_addr = (u_long) _ps.val; } } #endif }