aboutsummaryrefslogtreecommitdiff
path: root/gdb/i386obsd-nat.c
diff options
context:
space:
mode:
Diffstat (limited to 'gdb/i386obsd-nat.c')
-rw-r--r--gdb/i386obsd-nat.c60
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
+}