MIPS: Add microMIPS XPA support

Add support for the base and Virtualization ASE microMIPS instructions
as per the architecture specifications[1][2][3][4].

Most of this change by Andrew Bennett.

[1] "MIPS Architecture for Programmers Volume II-B: The microMIPS32
    Instruction Set", MIPS Technologies, Inc., Document Number: MD00582,
    Revision 5.04, January 15, 2014, Section 5.5 "Recoded 32-Bit
    Instructions", p. 340

[2] "microMIPS32 Architecture for Programmers Volume IV-i:
    Virtualization Module of the microMIPS32 Architecture", MIPS
    Technologies, Inc., Document Number: MD00848, Revision 1.06,
    December 10, 2013, Section 6.1 "Overview", pp. 133, 136

[3] "MIPS Architecture for Programmers Volume II-B: The microMIPS64
    Instruction Set", MIPS Technologies, Inc., Document Number: MD00594,
    Revision 5.04, January 15, 2014, Section 5.5 "Recoded 32-Bit
    Instructions", pp. 415, 444

[4] "microMIPS64 Architecture for Programmers Volume IV-i:
    Virtualization Module of the microMIPS64 Architecture", MIPS
    Technologies, Inc., Document Number: MD00849, Revision 1.06,
    December 10, 2013, Section 6.1 "Overview", pp. 134-135, 139-140

	binutils/
	* NEWS: Mention microMIPS XPA support.

	opcodes/
	* micromips-opc.c (XPA, XPAVZ): New macros.
	(micromips_opcodes): Add "mfhc0", "mfhgc0", "mthc0" and
	"mthgc0".

	gas/
	* config/tc-mips.c (mips_ases): Add microMIPS XPA support.
	* testsuite/gas/mips/micromips@xpa.d: New test.
	* testsuite/gas/mips/mips.exp: Run the new test.  Enable
	`xpa-virt-err' test for `micromips'.

4 files changed, 37 insertions, 5 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index c6fb96a..371fca8 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,6 +1,14 @@
 2017-06-30  Andrew Bennett  <andrew.bennett@imgtec.com>
 	    Maciej W. Rozycki  <macro@imgtec.com>
 
+	* config/tc-mips.c (mips_ases): Add microMIPS XPA support.
+	* testsuite/gas/mips/micromips@xpa.d: New test.
+	* testsuite/gas/mips/mips.exp: Run the new test.  Enable
+	`xpa-virt-err' test for `micromips'.
+
+2017-06-30  Andrew Bennett  <andrew.bennett@imgtec.com>
+	    Maciej W. Rozycki  <macro@imgtec.com>
+
 	* testsuite/gas/mips/micromips@r5.d: New test.
 	* testsuite/gas/mips/mips.exp: Run the new test.
 
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 9b42ef8..e1e6b32 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -1762,7 +1762,7 @@ static const struct mips_ase mips_ases[] = {
 
   { "xpa", ASE_XPA, 0,
     OPTION_XPA, OPTION_NO_XPA,
-     2,  2, -1, -1,
+    2, 2, 2, 2,
     -1 },
 
   { "mips16e2", ASE_MIPS16E2, 0,
diff --git a/gas/testsuite/gas/mips/micromips@xpa.d b/gas/testsuite/gas/mips/micromips@xpa.d
new file mode 100644
index 0000000..a8ab640
--- /dev/null
+++ b/gas/testsuite/gas/mips/micromips@xpa.d
@@ -0,0 +1,25 @@
+#objdump: -dr --prefix-addresses --show-raw-insn -M cp0-names=mips32r2
+#name: XPA instructions
+#source: xpa.s
+#as: -32 -mxpa -mvirt
+
+.*: +file format .*mips.*
+
+Disassembly of section \.text:
+[0-9a-f]+ <[^>]*> 0041 00f4 	mfhc0	v0,c0_random
+[0-9a-f]+ <[^>]*> 0050 00f4 	mfhc0	v0,c0_config
+[0-9a-f]+ <[^>]*> 0040 10f4 	mfhc0	v0,c0_mvpconf0
+[0-9a-f]+ <[^>]*> 0040 38f4 	mfhc0	v0,\$0,7
+[0-9a-f]+ <[^>]*> 0041 02f4 	mthc0	v0,c0_random
+[0-9a-f]+ <[^>]*> 0050 02f4 	mthc0	v0,c0_config
+[0-9a-f]+ <[^>]*> 0040 12f4 	mthc0	v0,c0_mvpconf0
+[0-9a-f]+ <[^>]*> 0040 3af4 	mthc0	v0,\$0,7
+[0-9a-f]+ <[^>]*> 0041 04f4 	mfhgc0	v0,c0_random
+[0-9a-f]+ <[^>]*> 0050 04f4 	mfhgc0	v0,c0_config
+[0-9a-f]+ <[^>]*> 0040 14f4 	mfhgc0	v0,c0_mvpconf0
+[0-9a-f]+ <[^>]*> 0040 3cf4 	mfhgc0	v0,\$0,7
+[0-9a-f]+ <[^>]*> 0041 06f4 	mthgc0	v0,c0_random
+[0-9a-f]+ <[^>]*> 0050 06f4 	mthgc0	v0,c0_config
+[0-9a-f]+ <[^>]*> 0040 16f4 	mthgc0	v0,c0_mvpconf0
+[0-9a-f]+ <[^>]*> 0040 3ef4 	mthgc0	v0,\$0,7
+	\.\.\.
diff --git a/gas/testsuite/gas/mips/mips.exp b/gas/testsuite/gas/mips/mips.exp
index 793505f..81dfd34 100644
--- a/gas/testsuite/gas/mips/mips.exp
+++ b/gas/testsuite/gas/mips/mips.exp
@@ -1561,10 +1561,9 @@ if { [istarget mips*-*-vxworks*] } {
     run_dump_test_arches "msa-relax"	[mips_arch_list_matching mips32r2 !mips32r6]
     run_dump_test_arches "msa-branch"	[mips_arch_list_matching mips32r2]
 
-    run_dump_test_arches "xpa"		[mips_arch_list_matching mips32r2 !micromips]
-    run_dump_test_arches "xpa-err"	[mips_arch_list_matching mips32r2 !micromips]
-    run_dump_test_arches "xpa-virt-err" \
-				[mips_arch_list_matching mips32r2 !micromips]
+    run_dump_test_arches "xpa"		[mips_arch_list_matching mips32r2]
+    run_dump_test_arches "xpa-err"	[mips_arch_list_matching mips32r2]
+    run_dump_test_arches "xpa-virt-err"	[mips_arch_list_matching mips32r2]
     run_dump_test_arches "r5" "-32"	[mips_arch_list_matching mips32r5]
 
     run_dump_test "pcrel-1"