Add support for ARMv8-M Mainline with DSP extension

2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>

bfd/
	(elf32_arm_merge_eabi_attributes): Add merging logic for
	Tag_DSP_extension.

binutils/
	* readelf.c (display_arm_attribute): Add output for Tag_DSP_extension.
	(arm_attr_public_tags): Define DSP_extension attribute.

gas/
	* NEWS: Document ARMv8-M and ARMv8-M Security and DSP Extensions.
	* config/tc-arm.c (arm_ext_dsp): New feature for Thumb DSP
	instructions.
	(arm_extensions): Add dsp extension for ARMv8-M Mainline.
	(aeabi_set_public_attributes): Memorize the feature bits of the
	architecture selected for Tag_CPU_arch.  Use it to set
	Tag_DSP_extension to 1 for ARMv8-M Mainline with DSP extension.
	(arm_convert_symbolic_attribute): Define Tag_DSP_extension.
	* testsuite/gas/arm/arch7em-bad.d: Rename to ...
	* testsuite/gas/arm/arch7em-bad-1.d: This.
	* testsuite/gas/arm/arch7em-bad-2.d: New file.
	* testsuite/gas/arm/arch7em-bad-3.d: Likewise.
	* testsuite/gas/arm/archv8m-main-dsp-1.d: Likewise.
	* testsuite/gas/arm/archv8m-main-dsp-2.d: Likewise.
	* testsuite/gas/arm/archv8m-main-dsp-3.d: Likewise.
	* testsuite/gas/arm/archv8m-main-dsp-4.d: Likewise.
	* testsuite/gas/arm/archv8m-main-dsp-5.d: Likewise.
	* testsuite/gas/arm/attr-march-armv8m.main.dsp.d: Likewise.

include/
	* elf/arm.h (Tag_DSP_extension): Define.

ld/
	* testsuite/ld-arm/arm-elf.exp (EABI attribute merging 10 (DSP)): New
	test.
	* testsuite/ld-arm/attr-merge-10b-dsp.s: New file.
	* testsuite/ld-arm/attr-merge-10-dsp.attr: Likewise.

4 files changed, 23 insertions, 0 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index ef1d3de..752f766 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,10 @@
+2016-05-10  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* testsuite/ld-arm/arm-elf.exp (EABI attribute merging 10 (DSP)): New
+	test.
+	* testsuite/ld-arm/attr-merge-10b-dsp.s: New file.
+	* testsuite/ld-arm/attr-merge-10-dsp.attr: Likewise.
+
 2016-05-10  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* ld/testsuite/ld-elf/flags1.d (xfail): Remove *-*-nacl*".
diff --git a/ld/testsuite/ld-arm/arm-elf.exp b/ld/testsuite/ld-arm/arm-elf.exp
index fea70a1..f34ce5f 100644
--- a/ld/testsuite/ld-arm/arm-elf.exp
+++ b/ld/testsuite/ld-arm/arm-elf.exp
@@ -411,6 +411,9 @@ set armeabitests_common {
      {"EABI attribute merging 10" "-r" "" "" {attr-merge-10a.s attr-merge-10b.s}
       {{readelf -A attr-merge-10.attr}}
       "attr-merge-10"}
+     {"EABI attribute merging 10 (DSP)" "-r" "" "" {attr-merge-10a.s attr-merge-10b-dsp.s}
+      {{readelf -A attr-merge-10-dsp.attr}}
+      "attr-merge-10-dsp"}
      {"EABI attribute arch merging 1" "-r" "" "" {arch-v6k.s arch-v6t2.s}
       {{readelf -A attr-merge-arch-1.attr}}
       "attr-merge-arch-1"}
diff --git a/ld/testsuite/ld-arm/attr-merge-10-dsp.attr b/ld/testsuite/ld-arm/attr-merge-10-dsp.attr
new file mode 100644
index 0000000..7cdbd49
--- /dev/null
+++ b/ld/testsuite/ld-arm/attr-merge-10-dsp.attr
@@ -0,0 +1,7 @@
+Attribute Section: aeabi
+File Attributes
+  Tag_CPU_name: "8-M.MAIN"
+  Tag_CPU_arch: v8-M.mainline
+  Tag_CPU_arch_profile: Microcontroller
+  Tag_THUMB_ISA_use: Yes
+  Tag_DSP_extension: Allowed
diff --git a/ld/testsuite/ld-arm/attr-merge-10b-dsp.s b/ld/testsuite/ld-arm/attr-merge-10b-dsp.s
new file mode 100644
index 0000000..de67b36
--- /dev/null
+++ b/ld/testsuite/ld-arm/attr-merge-10b-dsp.s
@@ -0,0 +1,6 @@
+	.arch armv8-m.main
+
+	@ Tag_CPU_arch & Tag_CPU_arch_profile = v8-M.MAIN
+	.eabi_attribute Tag_CPU_arch, 17
+	.eabi_attribute Tag_CPU_arch_profile, 'M'
+	.eabi_attribute Tag_DSP_extension, 1