[Patch ARM] Fix build attributes for armv8-a in case of assembler files that contain no directives.

There is currently a problem in the way in which we produce
build attributes for simple assembler files that have armv8-a
instructions.

In these case we need to generate TAG_ISA_THUMB_Use to be Thumb-2
and set the architecture profile to be 'A' rather than not
setting architecture profile to be 'A' and setting TAG_ISA_THUMB_Use
to be Thumb-1.

This is a pre-requisite for any v8-m patches that have been posted.
arm-none-eabi gas testsuite run. no regressions.

2015-12-17  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	* gas/config/tc-arm.c (aeabi_set_public_attributes): Adjust
	TAG_ARCH_profile for armv8-a.
	* gas/testsuite/gas/arm/armv8a-automatic-hlt.d: New test.
	* gas/testsuite/gas/arm/armv8a-automatic-hlt.s: New test.
	* gas/testsuite/gas/arm/armv8a-automatic-lda.d: New test.
	* gas/testsuite/gas/arm/armv8a-automatic-lda.s: New test.

6 files changed, 31 insertions, 3 deletions

diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index 6f3f933..f9c76ef 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -25649,7 +25649,8 @@ aeabi_set_public_attributes (void)
   aeabi_set_attribute_int (Tag_CPU_arch, arch);
 
   /* Tag_CPU_arch_profile.  */
-  if (ARM_CPU_HAS_FEATURE (flags, arm_ext_v7a))
+  if (ARM_CPU_HAS_FEATURE (flags, arm_ext_v7a)
+      || ARM_CPU_HAS_FEATURE (flags, arm_ext_v8))
     profile = 'A';
   else if (ARM_CPU_HAS_FEATURE (flags, arm_ext_v7r))
     profile = 'R';
diff --git a/gas/testsuite/gas/arm/armv8a-automatic-hlt.d b/gas/testsuite/gas/arm/armv8a-automatic-hlt.d
new file mode 100644
index 0000000..6e8c1db
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8a-automatic-hlt.d
@@ -0,0 +1,8 @@
+# readelf: -A
+# This test is only valid on ELF based ports.
+#not-target: *-*-*coff *-*-pe *-*-wince *-*-*aout* *-*-netbsd *-*-riscix*
+Attribute Section: aeabi
+File Attributes
+  Tag_CPU_arch: v8
+  Tag_CPU_arch_profile: Application
+  Tag_THUMB_ISA_use: Thumb-2
diff --git a/gas/testsuite/gas/arm/armv8a-automatic-hlt.s b/gas/testsuite/gas/arm/armv8a-automatic-hlt.s
new file mode 100644
index 0000000..29dd4ff
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8a-automatic-hlt.s
@@ -0,0 +1,6 @@
+	.thumb
+	.syntax unified
+	hlt
+	stlexd r0, r2, [r3]
+	sevl
+	hlt 0xf
diff --git a/gas/testsuite/gas/arm/armv8a-automatic-lda.d b/gas/testsuite/gas/arm/armv8a-automatic-lda.d
new file mode 100644
index 0000000..6e8c1db
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8a-automatic-lda.d
@@ -0,0 +1,8 @@
+# readelf: -A
+# This test is only valid on ELF based ports.
+#not-target: *-*-*coff *-*-pe *-*-wince *-*-*aout* *-*-netbsd *-*-riscix*
+Attribute Section: aeabi
+File Attributes
+  Tag_CPU_arch: v8
+  Tag_CPU_arch_profile: Application
+  Tag_THUMB_ISA_use: Thumb-2
diff --git a/gas/testsuite/gas/arm/armv8a-automatic-lda.s b/gas/testsuite/gas/arm/armv8a-automatic-lda.s
new file mode 100644
index 0000000..8e1ca0c
--- /dev/null
+++ b/gas/testsuite/gas/arm/armv8a-automatic-lda.s
@@ -0,0 +1,4 @@
+	.thumb
+	.syntax unified
+	lda r0, [r0]
+	stl r0, [r1]
diff --git a/include/opcode/arm.h b/include/opcode/arm.h
index 0814d80..daeb626 100644
--- a/include/opcode/arm.h
+++ b/include/opcode/arm.h
@@ -263,9 +263,10 @@
 #define ARM_ANY		ARM_FEATURE (-1, -1, 0)	/* Any basic core.  */
 #define ARM_FEATURE_ALL	ARM_FEATURE (-1, -1, -1)/* All CPU and FPU features.  */
 #define FPU_ANY_HARD	ARM_FEATURE_COPROC (FPU_FPA | FPU_VFP_HARD | FPU_MAVERICK)
-#define ARM_ARCH_THUMB2 ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2 | ARM_EXT_V7 \
+#define ARM_ARCH_THUMB2 ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2 | ARM_EXT_V7	\
 					      | ARM_EXT_V7A | ARM_EXT_V7R \
-					      | ARM_EXT_V7M | ARM_EXT_DIV)
+					      | ARM_EXT_V7M | ARM_EXT_DIV \
+					      | ARM_EXT_V8)
 /* v7-a+sec.  */
 #define ARM_ARCH_V7A_SEC ARM_FEATURE_CORE_LOW (ARM_AEXT_V7A | ARM_EXT_SEC)
 /* v7-a+mp+sec.  */