2002-07-04 17:13:28 +02:00
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/* Native-dependent code for OpenBSD/i386.
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2004-02-22 12:19:15 +01:00
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2005-12-17 23:34:03 +01:00
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Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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2002-07-04 17:13:28 +02:00
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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2005-12-17 23:34:03 +01:00
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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2002-07-04 17:13:28 +02:00
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#include "defs.h"
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#include <sys/param.h>
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#include <sys/sysctl.h>
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2003-08-10 20:32:09 +02:00
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#include "i386-tdep.h"
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2002-07-04 17:13:28 +02:00
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/* Prevent warning from -Wmissing-prototypes. */
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2002-07-04 17:17:43 +02:00
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void _initialize_i386obsd_nat (void);
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2002-07-04 17:13:28 +02:00
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void
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_initialize_i386obsd_nat (void)
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{
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/* OpenBSD provides a vm.psstrings sysctl that we can use to locate
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the sigtramp. That way we can still recognize a sigtramp if its
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location is changed in a new kernel. This is especially
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important for OpenBSD, since it uses a different memory layout
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than NetBSD, yet we cannot distinguish between the two.
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Of course this is still based on the assumption that the sigtramp
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is placed directly under the location where the program arguments
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and environment can be found. */
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#ifdef VM_PSSTRINGS
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{
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struct _ps_strings _ps;
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int mib[2];
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size_t len;
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mib[0] = CTL_VM;
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mib[1] = VM_PSSTRINGS;
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len = sizeof (_ps);
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if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)
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{
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2004-11-19 22:55:24 +01:00
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i386obsd_sigtramp_start_addr = (u_long) _ps.val - 128;
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i386obsd_sigtramp_end_addr = (u_long) _ps.val;
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2002-07-04 17:13:28 +02:00
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}
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}
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#endif
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}
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