[ARM] Add command line option for RAS extension.

This patch adds the architecture extension "+ras" to enable RAS
support. It is enabled by default for -march=armv8.2-a and available but
disabled by default for armv8-a and armv8.1-a.

gas/
	* config/tc-arm.c (arm_ext_v8_2): Rename to arm_ext_ras.
	(arm_ext_ras): Renamed from arm_ext_v8_2.
	(insns): Update for arm_ext_v8_2 renaming.
	(arm_extensions): Add "ras".
	* doc/c-arm.texi (ARM Options): Add an entry for "ras".
	* testsuite/gas/arm/armv8-a+ras.d: New.
	* testsuite/gas/arm/armv8_2-a.d: Add explicit command line
	options.

include/
	* opcode/arm.h (ARM_EXT2_RAS): New.  Also align preceding
	entries.
	(ARM_AEXT_V8_2A): Add ARM_EXT2_RAS.

opcodes/
	* arm-dis.c (arm_opcodes): Replace ARM_EXT_V8_2A with
	ARM_EXT_RAS in relevant entries.

5 files changed, 76 insertions, 4 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index ec30637..d41cd6d 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,14 @@
+2016-06-07  Matthew Wahab  <matthew.wahab@arm.com>
+
+	* config/tc-arm.c (arm_ext_v8_2): Rename to arm_ext_ras.
+	(arm_ext_ras): Renamed from arm_ext_v8_2.
+	(insns): Update for arm_ext_v8_2 renaming.
+	(arm_extensions): Add "ras".
+	* doc/c-arm.texi (ARM Options): Add an entry for "ras".
+	* testsuite/gas/arm/armv8-a+ras.d: New.
+	* testsuite/gas/arm/armv8_2-a.d: Add explicit command line
+	options.
+
 2016-06-05  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>
 
 	* itbl-parse.y (yyerror): Use modern argument declaration style.
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index d1114a1..5005343 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -223,8 +223,8 @@ static const arm_feature_set arm_ext_atomics =
 /* DSP instructions Tag_DSP_extension refers to.  */
 static const arm_feature_set arm_ext_dsp =
   ARM_FEATURE_CORE_LOW (ARM_EXT_V5E | ARM_EXT_V5ExP | ARM_EXT_V6_DSP);
-static const arm_feature_set arm_ext_v8_2 =
-  ARM_FEATURE_CORE_HIGH (ARM_EXT2_V8_2A);
+static const arm_feature_set arm_ext_ras =
+  ARM_FEATURE_CORE_HIGH (ARM_EXT2_RAS);
 /* FP16 instructions.  */
 static const arm_feature_set arm_ext_fp16 =
   ARM_FEATURE_CORE_HIGH (ARM_EXT2_FP16_INST);
@@ -19713,9 +19713,9 @@ static const struct asm_opcode insns[] =
 
  /* ARMv8.2 RAS extension.  */
 #undef  ARM_VARIANT
-#define ARM_VARIANT   & arm_ext_v8_2
+#define ARM_VARIANT   & arm_ext_ras
 #undef  THUMB_VARIANT
-#define THUMB_VARIANT & arm_ext_v8_2
+#define THUMB_VARIANT & arm_ext_ras
  TUE ("esb", 320f010, f3af8010, 0, (), noargs,  noargs),
 
 #undef  ARM_VARIANT
@@ -25508,6 +25508,9 @@ static const struct arm_option_extension_value_table arm_extensions[] =
   ARM_EXT_OPT ("pan",	ARM_FEATURE_CORE_HIGH (ARM_EXT2_PAN),
 			ARM_FEATURE (ARM_EXT_V8, ARM_EXT2_PAN, 0),
 			ARM_FEATURE_CORE_LOW (ARM_EXT_V8)),
+  ARM_EXT_OPT ("ras",	ARM_FEATURE_CORE_HIGH (ARM_EXT2_RAS),
+			ARM_FEATURE (ARM_EXT_V8, ARM_EXT2_RAS, 0),
+			ARM_FEATURE_CORE_LOW (ARM_EXT_V8)),
   ARM_EXT_OPT ("rdma",  FPU_ARCH_NEON_VFP_ARMV8_1,
 			ARM_FEATURE_COPROC (FPU_NEON_ARMV8 | FPU_NEON_EXT_RDMA),
 			ARM_FEATURE_CORE_LOW (ARM_EXT_V8)),
diff --git a/gas/doc/c-arm.texi b/gas/doc/c-arm.texi
index 7ca38d0..0cf7390 100644
--- a/gas/doc/c-arm.texi
+++ b/gas/doc/c-arm.texi
@@ -186,6 +186,8 @@ architectures),
 @code{virt} (Virtualization Extensions for v7-A architecture, implies
 @code{idiv}),
 @code{pan} (Priviliged Access Never Extensions for v8-A architecture),
+@code{ras} (Reliability, Availability and Serviceability extensions
+for v8-A architecture),
 @code{rdma} (ARMv8.1 Advanced SIMD extensions for v8-A architecture, implies
 @code{simd})
 and
diff --git a/gas/testsuite/gas/arm/armv8-a+ras.d b/gas/testsuite/gas/arm/armv8-a+ras.d
new file mode 100644
index 0000000..b6a4e45
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8-a+ras.d
@@ -0,0 +1,55 @@
+#name: ARMv8-A RAS
+#as: -march=armv8-a+ras
+#source: armv8_2-a.s
+#objdump: -dr
+#skip: *-*-pe *-wince-* *-*-coff
+
+
+.*: +file format .*arm.*
+
+Disassembly of section .text:
+
+[0-9a-f]+ <.*>:
+   [0-9a-f]+:	e320f010 	esb
+
+[0-9a-f]+ <.*>:
+   [0-9a-f]+:	f3af 8010 	esb
+
+[0-9a-f]+ <.*>:
+   [0-9a-f]+:	ee100f11 	mrc	15, 0, r0, cr0, cr1, \{0\}
+   [0-9a-f]+:	ee100fd2 	mrc	15, 0, r0, cr0, cr2, \{6\}
+  [0-9a-f]+:	ee150f13 	mrc	15, 0, r0, cr5, cr3, \{0\}
+  [0-9a-f]+:	ee150f33 	mrc	15, 0, r0, cr5, cr3, \{1\}
+  [0-9a-f]+:	ee051f33 	mcr	15, 0, r1, cr5, cr3, \{1\}
+  [0-9a-f]+:	ee150f14 	mrc	15, 0, r0, cr5, cr4, \{0\}
+  [0-9a-f]+:	ee150f34 	mrc	15, 0, r0, cr5, cr4, \{1\}
+  [0-9a-f]+:	ee051f34 	mcr	15, 0, r1, cr5, cr4, \{1\}
+  [0-9a-f]+:	ee150f54 	mrc	15, 0, r0, cr5, cr4, \{2\}
+  [0-9a-f]+:	ee051f54 	mcr	15, 0, r1, cr5, cr4, \{2\}
+  [0-9a-f]+:	ee150f74 	mrc	15, 0, r0, cr5, cr4, \{3\}
+  [0-9a-f]+:	ee051f74 	mcr	15, 0, r1, cr5, cr4, \{3\}
+  [0-9a-f]+:	ee150f94 	mrc	15, 0, r0, cr5, cr4, \{4\}
+  [0-9a-f]+:	ee150fb4 	mrc	15, 0, r0, cr5, cr4, \{5\}
+  [0-9a-f]+:	ee051fb4 	mcr	15, 0, r1, cr5, cr4, \{5\}
+  [0-9a-f]+:	ee150ff4 	mrc	15, 0, r0, cr5, cr4, \{7\}
+  [0-9a-f]+:	ee051ff4 	mcr	15, 0, r1, cr5, cr4, \{7\}
+  [0-9a-f]+:	ee150f15 	mrc	15, 0, r0, cr5, cr5, \{0\}
+  [0-9a-f]+:	ee051f15 	mcr	15, 0, r1, cr5, cr5, \{0\}
+  [0-9a-f]+:	ee150f35 	mrc	15, 0, r0, cr5, cr5, \{1\}
+  [0-9a-f]+:	ee051f35 	mcr	15, 0, r1, cr5, cr5, \{1\}
+  [0-9a-f]+:	ee150f95 	mrc	15, 0, r0, cr5, cr5, \{4\}
+  [0-9a-f]+:	ee051f95 	mcr	15, 0, r1, cr5, cr5, \{4\}
+  [0-9a-f]+:	ee150fb5 	mrc	15, 0, r0, cr5, cr5, \{5\}
+  [0-9a-f]+:	ee051fb5 	mcr	15, 0, r1, cr5, cr5, \{5\}
+  [0-9a-f]+:	ee1c0f31 	mrc	15, 0, r0, cr12, cr1, \{1\}
+  [0-9a-f]+:	ee0c1f31 	mcr	15, 0, r1, cr12, cr1, \{1\}
+  [0-9a-f]+:	ee910f91 	mrc	15, 4, r0, cr1, cr1, \{4\}
+  [0-9a-f]+:	ee811f91 	mcr	15, 4, r1, cr1, cr1, \{4\}
+  [0-9a-f]+:	ee950f72 	mrc	15, 4, r0, cr5, cr2, \{3\}
+  [0-9a-f]+:	ee851f72 	mcr	15, 4, r1, cr5, cr2, \{3\}
+  [0-9a-f]+:	ee910f31 	mrc	15, 4, r0, cr1, cr1, \{1\}
+  [0-9a-f]+:	ee811f31 	mcr	15, 4, r1, cr1, cr1, \{1\}
+  [0-9a-f]+:	ee9c0f31 	mrc	15, 4, r0, cr12, cr1, \{1\}
+  [0-9a-f]+:	ee8c1f31 	mcr	15, 4, r1, cr12, cr1, \{1\}
+  [0-9a-f]+:	eed10f11 	mrc	15, 6, r0, cr1, cr1, \{0\}
+  [0-9a-f]+:	eec11f11 	mcr	15, 6, r1, cr1, cr1, \{0\}
diff --git a/gas/testsuite/gas/arm/armv8_2-a.d b/gas/testsuite/gas/arm/armv8_2-a.d
index bf8c011..a971711 100644
--- a/gas/testsuite/gas/arm/armv8_2-a.d
+++ b/gas/testsuite/gas/arm/armv8_2-a.d
@@ -1,4 +1,5 @@
 #name: ARMv8.2-A
+#as: -march=armv8.2-a
 #objdump: -dr
 #skip: *-*-pe *-wince-* *-*-coff