[ARM] Support ARMv8.2 RAS extension.

The ARMv8.2 architecture includes the RAS extension which adds an
instruction, ESB, and a number of coprocessor registers. This patch adds
the instruction to binutils, making it available when -march=armv8.2-a
is selected. It also adds tests for the instruction and for the
coprocessor registers.

gas/
2016-01-12  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-arm.c (arm_ext_v8_2): New.
	(insns): Add "esb".
	* testsuite/gas/arm/armv8_2-a.d: New.
	* testsuite/gas/arm/armv8_2-a.s: New.

opcodes/
2016-01-12  Matthew Wahab  <matthew.wahab@arm.com>

	* arm-dis.c (arm_opcodes): Add "esb".
	(thumb_opcodes): Likewise.

Change-Id: I67f3d70789db78d1c66a56c4994675f99ac15e34

4 files changed, 111 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 59a0473..4db90f6 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2016-01-12  Matthew Wahab  <matthew.wahab@arm.com>
+
+	* config/tc-arm.c (arm_ext_v8_2): New.
+	(insns): Add "esb".
+	* testsuite/gas/arm/armv8_2-a.d: New.
+	* testsuite/gas/arm/armv8_2-a.s: New.
+
 2016-01-12  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/gas/ppc/vsx3.d: Accept nop padding.
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 0edc01a..046abe5 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -214,6 +214,8 @@ static const arm_feature_set arm_ext_v6t2_v8m =
 /* Instructions shared between ARMv8-A and ARMv8-M.  */
 static const arm_feature_set arm_ext_atomics =
   ARM_FEATURE_CORE_HIGH (ARM_EXT2_ATOMICS);
+static const arm_feature_set arm_ext_v8_2 =
+  ARM_FEATURE_CORE_HIGH (ARM_EXT2_V8_2A);
 
 static const arm_feature_set arm_arch_any = ARM_ANY;
 static const arm_feature_set arm_arch_full = ARM_FEATURE (-1, -1, -1);
@@ -19340,6 +19342,13 @@ static const struct asm_opcode insns[] =
   TUEc("crc32ch",1200240, fad0f090, 3, (RR, oRR, RR), crc32ch),
   TUEc("crc32cw",1400240, fad0f0a0, 3, (RR, oRR, RR), crc32cw),
 
+ /* ARMv8.2 RAS extension.  */
+#undef  ARM_VARIANT
+#define ARM_VARIANT   & arm_ext_v8_2
+#undef  THUMB_VARIANT
+#define THUMB_VARIANT & arm_ext_v8_2
+ TUE ("esb", 320f010, f3af8010, 0, (), noargs,  noargs),
+
 #undef  ARM_VARIANT
 #define ARM_VARIANT  & fpu_fpa_ext_v1  /* Core FPA instruction set (V1).  */
 #undef  THUMB_VARIANT
diff --git a/gas/testsuite/gas/arm/armv8_2-a.d b/gas/testsuite/gas/arm/armv8_2-a.d
new file mode 100644
index 0000000..92845de
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8_2-a.d
@@ -0,0 +1,51 @@
+#name: ARMv8.2-A
+#objdump: -dr
+
+.*: +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.s b/gas/testsuite/gas/arm/armv8_2-a.s
new file mode 100644
index 0000000..a27ac63
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8_2-a.s
@@ -0,0 +1,44 @@
+	/* ARMv8.2 features.  */
+
+	/* RAS instructions.  */
+A1:
+	.arm
+	esb
+T1:	.thumb
+	esb
+
+	/* RAS system registers.  */
+	.macro test_sysreg Opc1 CRn CRm Opc2 rw
+	mrc p15, \Opc1,\() r0, \CRn\(), \CRm\(), \Opc2\()
+	.if \rw
+	mcr p15, \Opc1\(), r1, \CRn\(), \CRm\(), \Opc2\()
+	.endif
+	.endm
+
+A2:
+	.arm
+	test_sysreg 0 c0 c1 0 0
+	test_sysreg 0 c0 c2 6 0
+	test_sysreg 0 c5 c3 0 0
+	test_sysreg 0 c5 c3 1 1
+
+	test_sysreg 0 c5 c4 0 0
+	test_sysreg 0 c5 c4 1 1
+	test_sysreg 0 c5 c4 2 1
+	test_sysreg 0 c5 c4 3 1
+	test_sysreg 0 c5 c4 4 0
+	test_sysreg 0 c5 c4 5 1
+	test_sysreg 0 c5 c4 7 1
+
+	test_sysreg 0 c5 c5 0 1
+	test_sysreg 0 c5 c5 1 1
+	test_sysreg 0 c5 c5 4 1
+	test_sysreg 0 c5 c5 5 1
+
+	test_sysreg 0 c12 c1 1 1
+	test_sysreg 4 c1  c1 4 1
+	test_sysreg 4 c5  c2 3 1
+	test_sysreg 4 c1  c1 1 1
+	test_sysreg 4 c12 c1 1 1
+
+	test_sysreg 6 c1 c1 0 1