[Patch] Update ARM attribute support for Tag_DIV_use and Tag_MPextension_use

[Matthew Gretton-Dann]

Hi,

Please can someone review, and then if appropriate approve, and commit
the attached patch?

The patch adds support for the ARM ABI attributes: Tag_DIV_use, and
Tag_MPextension_use.  It also adds some new attribute values for
existing attributes to the attribute dumping in readelf.

The interesting part of the patch is the support for
Tag_MPextension_use.  A previous version of the ABI gave this tag the ID
70, however, the latest version of the ABI has changed the ID to 42.  To
keep compatibility with old toolchains that use the old ID I treat both
tag IDs as being identical - but when merging attributes we only output
the new ID.

ChangeLog entry:
2010-02-17  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>
	* bfd/elf32-arm.c (elf32_arm_merge_eabi_attributes): Add support
	for merging Tag_DIV_use, Tag_MPextension_use, and
	Tag_MPextension_use_legacy tags.
	* bfd/readelf.c (arm_attr_tag_Advanced_SIMD_arch): Add
	description of newly permitted attribute values.
	(arm_attr_tag_Virtualization_use): Likewise.
	(arm_attr_tag_DIV_use): Add description of new attribute.
	(arm_attr_tag_MPextension_use): Likewise.
	* gas/config/tc-arm.c (arm_convert_symbolic_attribute): Add
	Tag_DIV_use.
	* gas/doc/c-arm.texi: Likewise
	* include/elf/arm.h (Tag_MPextension_use): Renumber.
	(Tag_DIV_use): Add.
	(Tag_MPextension_use_legacy): Likewise.
	* gas/testsuite/arm/attr-order.d: Fix test for new name for
	Tag_Virtualization_use attribute values
	* ld/testsuite/ld-arm/attr-merge-3.attr: Fix test for new
	Tag_MPextension_use value.
	* ld/testsuite/ld-arm/attr-merge-3b.s: Likewise
	* ld/testsuite/ld-arm/attr-merge-unknown-1.d: Fix test now that
	42 is a recognised attribute ID.
	* ld/testsuite/ld-arm/attr-merge-unknown-1.s: Likewise.
	* ld/testsuite/ld-arm/attr-merge-6.attr: New test.
	* ld/testsuite/ld-arm/attr-merge-6a.s: Likewise.
	* ld/testsuite/ld-arm/attr-merge-6b.s: Likewise.
	* ld/testsuite/ld-arm/attr-merge-7.attr: Likewise.
	* ld/testsuite/ld-arm/attr-merge-7a.s: Likewise.
	* ld/testsuite/ld-arm/attr-merge-7b.s: Likewise.
	* ld/testsuite/ld-arm/arm-elf.exp: Run the new tests.

Thanks,

Matt

-- 
Matthew Gretton-Dann
Principal Engineer - Tools, PD Software
ARM Limited
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