[patch] m68k-tdep.c: Rename %mbb to %mbo.

[Kazu Hirata <kazu at codesourcery dot com>]

Hi,

Attached is a patch to accept %mbb as an alias for %mbo, which is a
CPU register in fido, a m68k variant.

I recently renamed %mbb to %mbo in binutils while accepting %mbb for
backward compatibility.  This patch is the gdb version of the backward
compatibility.  Namely, with this patch, gdb accetps %mbb as an alias
for %mbo.

Tested by running the gdb testsuite.  OK to apply?

Kazu Hirata

2007-09-26  Kazu Hirata  <kazu@codesourcery.com>

	* m68k-tdep.c (value_of_m68k_user_reg, mbb_regname): New.
	(m68k_gdbarch_init): Register a user register "mbb".

Index: gdb/m68k-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/m68k-tdep.c,v
retrieving revision 1.123
diff -u -d -p -r1.123 m68k-tdep.c
--- gdb/m68k-tdep.c	23 Aug 2007 18:08:35 -0000	1.123
+++ gdb/m68k-tdep.c	26 Sep 2007 18:43:01 -0000
@@ -1054,6 +1054,20 @@ m68k_svr4_init_abi (struct gdbarch_info 
   tdep->struct_value_regnum = M68K_A0_REGNUM;
 }
 
+/* Look up a register value for a register name BATON by converting
+   BATON to a standard name (either a built-in register name or one in
+   a target description.  */
+
+static struct value *
+value_of_m68k_user_reg (struct frame_info *frame, const void *baton)
+{
+  const char *regname = baton;
+  int regnum = user_reg_map_name_to_regnum (get_frame_arch (frame),
+					    regname, strlen (regname));
+  return value_of_register (regnum, frame);
+}
+
+static const char *mbb_regname = "mbo";
 
 /* Function: m68k_gdbarch_init
    Initializer function for the m68k gdbarch vector.
@@ -1069,6 +1083,7 @@ m68k_gdbarch_init (struct gdbarch_info i
   int i;
   enum m68k_flavour flavour = m68k_no_flavour;
   int has_fp = 1;
+  int has_mbo = 0;
   const struct floatformat **long_double_format = floatformats_m68881_ext;
 
   /* Check any target description for validity.  */
@@ -1096,7 +1111,11 @@ m68k_gdbarch_init (struct gdbarch_info i
 	  feature = tdesc_find_feature (info.target_desc,
 					"org.gnu.gdb.fido.core");
 	  if (feature != NULL)
-	    flavour = m68k_fido_flavour;
+	    {
+	      flavour = m68k_fido_flavour;
+	      if (tdesc_unnumbered_register (feature, "mbo"))
+		has_mbo = 1;
+	    }
 	}
 
       if (feature == NULL)
@@ -1257,6 +1276,9 @@ m68k_gdbarch_init (struct gdbarch_info i
   if (tdesc_data)
     tdesc_use_registers (gdbarch, tdesc_data);
 
+  if (has_mbo)
+    user_reg_add (gdbarch, "mbb", value_of_m68k_user_reg, mbb_regname);
+
   return gdbarch;
 }