60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* Native-dependent code for OpenBSD/i386.
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Copyright 2002, 2003 Free Software Foundation, Inc.
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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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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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#include "i386-tdep.h"
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/* Prevent warning from -Wmissing-prototypes. */
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void _initialize_i386obsd_nat (void);
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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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i386obsd_sigtramp_start = (CORE_ADDR)_ps.val - 128;
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i386obsd_sigtramp_end = (CORE_ADDR)_ps.val;
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}
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}
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#endif
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}
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