* i386bsd-tdep.c (i386nbsd_sigtramp_start, i386nbsd_sigtramp_end):

New variables.
(i386nbsd_init_abi): Use these to initialize tdep->sigtramp_start
and tdep->sigtramp_end.
* i386obsd-nat.c: New file.
* config/i386/obsd.mh (NATDEPFILES): Add i386obsd-nat.o.

1 files changed, 60 insertions, 0 deletions

diff --git a/gdb/i386obsd-nat.c b/gdb/i386obsd-nat.c
new file mode 100644
index 0000000..01a2bbe
--- /dev/null
+++ b/gdb/i386obsd-nat.c
@@ -0,0 +1,60 @@
+/* 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_i386fbsd_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 i386nbsd_sigtramp_start;
+    extern CORE_ADDR i386nbsd_sigtramp_end;
+
+    mib[0] = CTL_VM;
+    mib[1] = VM_PSSTRINGS;
+    len = sizeof (_ps);
+    if (sysctl (mib, 2, &_ps, &len, NULL, 0) == 0)
+      {
+	i386nbsd_sigtramp_start = (CORE_ADDR)_ps.val - 128;
+	i386nbsd_sigtramp_end = (CORE_ADDR)_ps.val;
+      }
+  }
+#endif
+}