1 files changed, 92 insertions, 0 deletions
diff --git a/contrib/gdb/gdb/sentinel-frame.c b/contrib/gdb/gdb/sentinel-frame.c
new file mode 100644
index 000000000000..94c1ee31311e
--- /dev/null
+++ b/contrib/gdb/gdb/sentinel-frame.c
@@ -0,0 +1,92 @@
+/* Code dealing with register stack frames, for GDB, the GNU debugger.
+
+   Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+   1995, 1996, 1997, 1998, 1999, 2000, 2001, 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 "regcache.h"
+#include "sentinel-frame.h"
+#include "inferior.h"
+#include "frame-unwind.h"
+
+struct frame_unwind_cache
+{
+  struct regcache *regcache;
+};
+
+void *
+sentinel_frame_cache (struct regcache *regcache)
+{
+  struct frame_unwind_cache *cache = 
+    FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
+  cache->regcache = regcache;
+  return cache;
+}
+
+/* Here the register value is taken direct from the register cache.  */
+
+static void
+sentinel_frame_prev_register (struct frame_info *next_frame,
+			      void **this_prologue_cache,
+			      int regnum, int *optimized,
+			      enum lval_type *lvalp, CORE_ADDR *addrp,
+			      int *realnum, void *bufferp)
+{
+  struct frame_unwind_cache *cache = *this_prologue_cache;
+  /* Describe the register's location.  A reg-frame maps all registers
+     onto the corresponding hardware register.  */
+  *optimized = 0;
+  *lvalp = lval_register;
+  *addrp = register_offset_hack (current_gdbarch, regnum);
+  *realnum = regnum;
+
+  /* If needed, find and return the value of the register.  */
+  if (bufferp != NULL)
+    {
+      /* Return the actual value.  */
+      /* Use the regcache_cooked_read() method so that it, on the fly,
+         constructs either a raw or pseudo register from the raw
+         register cache.  */
+      regcache_cooked_read (cache->regcache, regnum, bufferp);
+    }
+}
+
+static void
+sentinel_frame_this_id (struct frame_info *next_frame,
+			void **this_prologue_cache,
+			struct frame_id *this_id)
+{
+  /* The sentinel frame is used as a starting point for creating the
+     previous (inner most) frame.  That frame's THIS_ID method will be
+     called to determine the inner most frame's ID.  Not this one.  */
+  internal_error (__FILE__, __LINE__, "sentinel_frame_this_id called");
+}
+
+const struct frame_unwind sentinel_frame_unwinder =
+{
+  /* Should the sentinel frame be given a special type?  */
+  NORMAL_FRAME,
+  sentinel_frame_this_id,
+  sentinel_frame_prev_register
+};
+
+const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder;