(x86_access_reg): Add a debug statement so accesses to bad register numbers

can be seen with debugging enabled.

(Logical change 1.81)

src/x86/Gregs-x86.c

@@ -0,0 +1,57 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2002 Hewlett-Packard Co
+	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "unwind_i.h"
+
+HIDDEN int
+x86_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
+		int write)
+{
+  struct x86_loc loc = X86_LOC (0, 0);
+
+  switch (reg)
+    {
+    case UNW_X86_EIP:
+      if (write)
+	c->eip = *valp;		/* also update the EIP cache */
+      loc = c->eip_loc;
+      break;
+
+    case UNW_X86_ESP:
+      if (write)
+	return -UNW_EREADONLYREG;
+      *valp = c->esp;
+      return 0;
+
+    default:
+      debug (1, "%s: bad register number %u\n", __FUNCTION__, reg);
+      return -UNW_EBADREG;
+    }
+
+  if (write)
+    return x86_put (c, loc, *valp);
+  else
+    return x86_get (c, loc, valp);
+}