[AArch64][PATCH 2/2] Support ARMv8.2 DC CVAP instruction.

ARMv8.2 adds the new system instruction DC CVAP. This patch adds support
for the instruction to binutils, enabled when -march=armv8.2-a is
selected.

gas/
2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-aarch64.c (parse_sys_ins_reg): Add check of
	architectural support for system register.

gas/testsuite/
2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>

	* gas/aarch64/sysreg-2.d: Add tests for dc instruction.
	* gas/aarch64/sysreg-2.s: Add uses of dc instruction.

include/opcode/
2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64.h (aarch64_sys_ins_reg_supported_p): Declare.

opcodes/
2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>

	* aarch64-opc.c (aarch64_sys_regs_dc): Add "cvap".
	(aarch64_sys_ins_reg_supported_p): New.

Change-Id: I3158b97d9bbee9644c2d0e2986db807412ef1053

9 files changed, 51 insertions, 0 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 8b95bdd..aa6454e 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
+
+	* config/tc-aarch64.c (parse_sys_ins_reg): Add check of
+	architectural support for system register.
+
 2015-12-10  Jose E. Marchesi  <jose.marchesi@oracle.com>
 
 	* doc/c-sparc.texi (Sparc-Regs): Document the %dN and %qN notation
diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index d306710..bb2f228 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -3687,6 +3687,10 @@ parse_sys_ins_reg (char **str, struct hash_control *sys_ins_regs)
   if (!o)
     return NULL;
 
+  if (!aarch64_sys_ins_reg_supported_p (cpu_variant, o))
+    as_bad (_("selected processor does not support system register "
+	      "name '%s'"), buf);
+
   *str = q;
   return o;
 }
diff --git a/gas/testsuite/ChangeLog b/gas/testsuite/ChangeLog
index aecac6a..1a2f004 100644
--- a/gas/testsuite/ChangeLog
+++ b/gas/testsuite/ChangeLog
@@ -1,5 +1,10 @@
 2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
 
+	* gas/aarch64/sysreg-2.d: Add tests for dc instruction.
+	* gas/aarch64/sysreg-2.s: Add uses of dc instruction.
+
+2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
+
 	* gas/aarch64/uao-directive.d: New.
 	* gas/aarch64/uao.d: New.
 	* gas/aarch64/uao.s: New.
diff --git a/gas/testsuite/gas/aarch64/sysreg-2.d b/gas/testsuite/gas/aarch64/sysreg-2.d
index 31b9f33..dffe08f 100644
--- a/gas/testsuite/gas/aarch64/sysreg-2.d
+++ b/gas/testsuite/gas/aarch64/sysreg-2.d
@@ -27,3 +27,6 @@ Disassembly of section .text:
   [0-9a-f]+:	d518c125 	msr	disr_el1, x5
   [0-9a-f]+:	d538c125 	mrs	x5, disr_el1
   [0-9a-f]+:	d53cc125 	mrs	x5, vdisr_el2
+  [0-9a-f]+:	d50b7a20 	dc	cvac, x0
+  [0-9a-f]+:	d50b7b21 	dc	cvau, x1
+  [0-9a-f]+:	d50b7c22 	dc	cvap, x2
diff --git a/gas/testsuite/gas/aarch64/sysreg-2.s b/gas/testsuite/gas/aarch64/sysreg-2.s
index 2a6b06c..62b3a5e 100644
--- a/gas/testsuite/gas/aarch64/sysreg-2.s
+++ b/gas/testsuite/gas/aarch64/sysreg-2.s
@@ -30,3 +30,9 @@
 	rw_sys_reg sys_reg=vsesr_el2 xreg=x5 r=1 w=0
 	rw_sys_reg sys_reg=disr_el1 xreg=x5 r=1 w=1
 	rw_sys_reg sys_reg=vdisr_el2 xreg=x5 r=1 w=0
+
+	/* DC CVAP.  */
+
+	dc cvac, x0
+	dc cvau, x1
+	dc cvap, x2
diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index 2f06d4e..0a186e8 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,5 +1,9 @@
 2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
 
+	* aarch64.h (aarch64_sys_ins_reg_supported_p): Declare.
+
+2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
+
 	* aarch64.h (aarch64_sys_ins_reg): Replace has_xt with flags.
 	(aarch64_sys_ins_reg_has_xt): Declare.
 
diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index d0f6c3d..7477066 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -676,6 +676,9 @@ typedef struct
 } aarch64_sys_ins_reg;
 
 extern bfd_boolean aarch64_sys_ins_reg_has_xt (const aarch64_sys_ins_reg *);
+extern bfd_boolean
+aarch64_sys_ins_reg_supported_p (const aarch64_feature_set,
+				 const aarch64_sys_ins_reg *);
 
 extern const aarch64_sys_ins_reg aarch64_sys_regs_ic [];
 extern const aarch64_sys_ins_reg aarch64_sys_regs_dc [];
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 9385878..3d84fbe 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,5 +1,10 @@
 2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
 
+	* aarch64-opc.c (aarch64_sys_regs_dc): Add "cvap".
+	(aarch64_sys_ins_reg_supported_p): New.
+
+2015-12-10  Matthew Wahab  <matthew.wahab@arm.com>
+
 	* aarch64-dis.c (aarch64_ext_regrt_sysins): Replace use of has_xt
 	with aarch64_sys_ins_reg_has_xt.
 	(aarch64_ext_sysins_op): Likewise.
diff --git a/opcodes/aarch64-opc.c b/opcodes/aarch64-opc.c
index 2ae2f10..86aeae0 100644
--- a/opcodes/aarch64-opc.c
+++ b/opcodes/aarch64-opc.c
@@ -3264,6 +3264,7 @@ const aarch64_sys_ins_reg aarch64_sys_regs_dc[] =
     { "cvac",       CPENS (3, C7, C10, 1), F_HASXT },
     { "csw",	    CPENS (0, C7, C10, 2), F_HASXT },
     { "cvau",       CPENS (3, C7, C11, 1), F_HASXT },
+    { "cvap",       CPENS (3, C7, C12, 1), F_HASXT | F_ARCHEXT },
     { "civac",      CPENS (3, C7, C14, 1), F_HASXT },
     { "cisw",       CPENS (0, C7, C14, 2), F_HASXT },
     { 0,       CPENS(0,0,0,0), 0 }
@@ -3329,6 +3330,21 @@ aarch64_sys_ins_reg_has_xt (const aarch64_sys_ins_reg *sys_ins_reg)
   return (sys_ins_reg->flags & F_HASXT) != 0;
 }
 
+extern bfd_boolean
+aarch64_sys_ins_reg_supported_p (const aarch64_feature_set features,
+				 const aarch64_sys_ins_reg *reg)
+{
+  if (!(reg->flags & F_ARCHEXT))
+    return TRUE;
+
+  /* DC CVAP.  Values are from aarch64_sys_regs_dc.  */
+  if (reg->value == CPENS (3, C7, C12, 1)
+      && !AARCH64_CPU_HAS_FEATURE (features, AARCH64_FEATURE_V8_2))
+    return FALSE;
+
+  return TRUE;
+}
+
 #undef C0
 #undef C1
 #undef C2