Ignore MOD field for control/debug register move

This patch ignores the MOD field in control/debug register move
instructions.

gas/testsuite/

	* gas/i386/cdr.d: New file.
	* gas/i386/cdr.s: Likewise.
	* gas/i386/x86-64-cdr.d: Likewise.

	* gas/i386/i386.exp: Run cdr and x86-64-cdr.

opcodes/

	* i386-dis.c (MOD_0F20): Removed.
	(MOD_0F21): Likewise.
	(MOD_0F22): Likewise.
	(MOD_0F23): Likewise.
	(dis386_twobyte): Replace MOD_0F20, MOD_0F21, MOD_0F22 and
	MOD_0F23 with "movZ".
	(mod_table): Remove MOD_0F20, MOD_0F21, MOD_0F22 and MOD_0F23.
	(OP_R): Check mod/rm byte and call OP_E_register.

7 files changed, 70 insertions, 32 deletions

diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
index 9bee24c..f8a85bc 100644
--- a/gas/testsuite/ChangeLog
+++ b/gas/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2014-09-22  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* gas/i386/cdr.d: New file.
+	* gas/i386/cdr.s: Likewise.
+	* gas/i386/x86-64-cdr.d: Likewise.
+
+	* gas/i386/i386.exp: Run cdr and x86-64-cdr.
+
 2014-09-16  Ilya Tocar  <ilya.tocar@intel.com>
 
 	* gas/i386/avx512dq-rcig.s: New.
diff --git a/gas/testsuite/gas/i386/cdr.d b/gas/testsuite/gas/i386/cdr.d
new file mode 100644
index 0000000..b63b2a6
--- /dev/null
+++ b/gas/testsuite/gas/i386/cdr.d
@@ -0,0 +1,13 @@
+#objdump: -dw
+#name: i386 control/debug register with ignored MOD field
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+ <start>:
+[ 	]*[a-f0-9]+:	0f 22 1f             	mov    %edi,%cr3
+[ 	]*[a-f0-9]+:	0f 20 1f             	mov    %cr3,%edi
+[ 	]*[a-f0-9]+:	0f 21 1f             	mov    %db3,%edi
+[ 	]*[a-f0-9]+:	0f 23 1f             	mov    %edi,%db3
+#pass
diff --git a/gas/testsuite/gas/i386/cdr.s b/gas/testsuite/gas/i386/cdr.s
new file mode 100644
index 0000000..fb7c5a0
--- /dev/null
+++ b/gas/testsuite/gas/i386/cdr.s
@@ -0,0 +1,14 @@
+	.text
+start:
+	.byte 0x0f
+	.byte 0x22
+	.byte 0x1f
+	.byte 0x0f
+	.byte 0x20
+	.byte 0x1f
+	.byte 0x0f
+	.byte 0x21
+	.byte 0x1f
+	.byte 0x0f
+	.byte 0x23
+	.byte 0x1f
diff --git a/gas/testsuite/gas/i386/i386.exp b/gas/testsuite/gas/i386/i386.exp
index 55fb8e6..7549a40 100644
--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -80,6 +80,7 @@ if [expr ([istarget "i*86-*-*"] ||  [istarget "x86_64-*-*"]) && [gas_32_check]]
     run_dump_test "padlock"
     run_dump_test "crx"
     run_list_test "cr-err" ""
+    run_dump_test "cdr"
     run_dump_test "svme"
     run_dump_test "amdfam10"
     run_dump_test "ssse3"
@@ -449,6 +450,7 @@ if [expr ([istarget "i*86-*-*"] || [istarget "x86_64-*-*"]) && [gas_64_check]] t
     run_dump_test "x86-64-crx-suffix"
     run_dump_test "x86-64-drx"
     run_dump_test "x86-64-drx-suffix"
+    run_dump_test "x86-64-cdr"
     run_dump_test "x86-64-ssse3"
     run_dump_test "x86-64-rep"
     run_dump_test "x86-64-rep-suffix"
diff --git a/gas/testsuite/gas/i386/x86-64-cdr.d b/gas/testsuite/gas/i386/x86-64-cdr.d
new file mode 100644
index 0000000..5365d50
--- /dev/null
+++ b/gas/testsuite/gas/i386/x86-64-cdr.d
@@ -0,0 +1,14 @@
+#objdump: -dw
+#name: x86-64 control/debug register with ignored MOD field
+#source: cdr.s
+
+.*: +file format .*
+
+Disassembly of section .text:
+
+0+ <start>:
+[ 	]*[a-f0-9]+:	0f 22 1f             	mov    %rdi,%cr3
+[ 	]*[a-f0-9]+:	0f 20 1f             	mov    %cr3,%rdi
+[ 	]*[a-f0-9]+:	0f 21 1f             	mov    %db3,%rdi
+[ 	]*[a-f0-9]+:	0f 23 1f             	mov    %rdi,%db3
+#pass
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 42e09dd..e5bcb13 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,14 @@
+2014-09-22  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* i386-dis.c (MOD_0F20): Removed.
+	(MOD_0F21): Likewise.
+	(MOD_0F22): Likewise.
+	(MOD_0F23): Likewise.
+	(dis386_twobyte): Replace MOD_0F20, MOD_0F21, MOD_0F22 and
+	MOD_0F23 with "movZ".
+	(mod_table): Remove MOD_0F20, MOD_0F21, MOD_0F22 and MOD_0F23.
+	(OP_R): Check mod/rm byte and call OP_E_register.
+
 2014-09-16 Kuan-Lin Chen <kuanlinchentw@gmail.com>
 
 	* nds32-asm.c (nds32_opcodes, operand_fields, keyword_im5_i,
diff --git a/opcodes/i386-dis.c b/opcodes/i386-dis.c
index 79abe09..c7cfb55 100644
--- a/opcodes/i386-dis.c
+++ b/opcodes/i386-dis.c
@@ -753,10 +753,6 @@ enum
   MOD_0F1A_PREFIX_0,
   MOD_0F1B_PREFIX_0,
   MOD_0F1B_PREFIX_1,
-  MOD_0F20,
-  MOD_0F21,
-  MOD_0F22,
-  MOD_0F23,
   MOD_0F24,
   MOD_0F26,
   MOD_0F2B_PREFIX_0,
@@ -2736,10 +2732,10 @@ static const struct dis386 dis386_twobyte[] = {
   { "nopQ",		{ Ev } },
   { "nopQ",		{ Ev } },
   /* 20 */
-  { MOD_TABLE (MOD_0F20) },
-  { MOD_TABLE (MOD_0F21) },
-  { MOD_TABLE (MOD_0F22) },
-  { MOD_TABLE (MOD_0F23) },
+  { "movZ",		{ Rm, Cm } },
+  { "movZ",		{ Rm, Dm } },
+  { "movZ",		{ Cm, Rm } },
+  { "movZ",		{ Dm, Rm } },
   { MOD_TABLE (MOD_0F24) },
   { Bad_Opcode },
   { MOD_TABLE (MOD_0F26) },
@@ -11642,26 +11638,6 @@ static const struct dis386 mod_table[][2] = {
     { "nopQ",		{ Ev } },
   },
   {
-    /* MOD_0F20 */
-    { Bad_Opcode },
-    { "movZ",		{ Rm, Cm } },
-  },
-  {
-    /* MOD_0F21 */
-    { Bad_Opcode },
-    { "movZ",		{ Rm, Dm } },
-  },
-  {
-    /* MOD_0F22 */
-    { Bad_Opcode },
-    { "movZ",		{ Cm, Rm } },
-  },
-  {
-    /* MOD_0F23 */
-    { Bad_Opcode },
-    { "movZ",		{ Dm, Rm } },
-  },
-  {
     /* MOD_0F24 */
     { Bad_Opcode },
     { "movL",		{ Rd, Td } },
@@ -15892,10 +15868,10 @@ OP_T (int dummy ATTRIBUTE_UNUSED, int sizeflag ATTRIBUTE_UNUSED)
 static void
 OP_R (int bytemode, int sizeflag)
 {
-  if (modrm.mod == 3)
-    OP_E (bytemode, sizeflag);
-  else
-    BadOp ();
+  /* Skip mod/rm byte.  */
+  MODRM_CHECK;
+  codep++;
+  OP_E_register (bytemode, sizeflag);
 }
 
 static void