commit 8514e4db84ccafaf3be07e842be2fa2001ba876e
Author: Alan Modra <amodra@gmail.com>
Date:   Fri Nov 28 13:21:52 2014 +1030

    Don't deprecate powerpc mftb insn
    
    mftb is marked phased out in the architecture manual, but we can keep
    it as an extended mnemonic for mftbl.
    
            * ppc-opc.c (powerpc_opcodes <mftb>): Don't deprecate for power7.
            (TB): Delete.
            (insert_tbr, extract_tbr): Validate tbr number.

### a/opcodes/ChangeLog
### b/opcodes/ChangeLog
## -1,3 +1,9 @@
+2014-11-28  Alan Modra  <amodra@gmail.com>
+
+	* ppc-opc.c (powerpc_opcodes <mftb>): Don't deprecate for power7.
+	(TB): Delete.
+	(insert_tbr, extract_tbr): Validate tbr number.
+
 2014-11-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* configure: Regenerated.
--- a/opcodes/ppc-opc.c
+++ b/opcodes/ppc-opc.c
@@ -1872,28 +1872,30 @@ extract_sprg (unsigned long insn,
    much, since the architecture manual does not define mftb as
    accepting any values other than 268 or 269.  */
 
-#define TB (268)
-
 static unsigned long
 insert_tbr (unsigned long insn,
 	    long value,
 	    ppc_cpu_t dialect ATTRIBUTE_UNUSED,
-	    const char **errmsg ATTRIBUTE_UNUSED)
+	    const char **errmsg)
 {
   if (value == 0)
-    value = TB;
+    value = 268;
+  if (value != 268 && value != 269)
+    *errmsg = _("invalid tbr number");
   return insn | ((value & 0x1f) << 16) | ((value & 0x3e0) << 6);
 }
 
 static long
 extract_tbr (unsigned long insn,
 	     ppc_cpu_t dialect ATTRIBUTE_UNUSED,
-	     int *invalid ATTRIBUTE_UNUSED)
+	     int *invalid)
 {
   long ret;
 
   ret = ((insn >> 16) & 0x1f) | ((insn >> 6) & 0x3e0);
-  if (ret == TB)
+  if (ret != 268 && ret != 269)
+    *invalid = 1;
+  if (ret == 268)
     ret = 0;
   return ret;
 }
@@ -5051,7 +5053,7 @@ const struct powerpc_opcode powerpc_opcodes[] = {
 
 {"mftbl",	XSPR(31,371,268), XSPR_MASK, PPC,	NO371,		{RT}},
 {"mftbu",	XSPR(31,371,269), XSPR_MASK, PPC,	NO371,		{RT}},
-{"mftb",	X(31,371),	X_MASK,      PPC|PPCA2,	NO371|POWER7,	{RT, TBR}},
+{"mftb",	X(31,371),	X_MASK,      PPC|PPCA2,	NO371,		{RT, TBR}},
 
 {"lwaux",	X(31,373),	X_MASK,      PPC64|PPCVLE, PPCNONE,	{RT, RAL, RB}},