Add support for ARMv8-M security extensions instructions

Add support for ARMv8-M security extensions instructions

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

gas/
	* config/tc-arm.c (arm_ext_m): Add feature bit ARM_EXT2_V8M_MAIN.
	(arm_ext_v8m_main): New feature set for bit ARM_EXT2_V8M_MAIN.
	(arm_ext_v8m_m_only): New feature set for instructions in ARMv8-M not
	shared with a non M profile architecture.
	(do_rn): New function.
	(known_t32_only_insn): Check opcode against arm_ext_v8m_m_only rather
	than arm_ext_v8m.
	(v7m_psrs): Add ARMv8-M security extensions new special registers.
	(insns): Add ARMv8-M Security Extensions instructions.
	(aeabi_set_public_attributes): Use arm_ext_v8m_m_only instead of
	arm_ext_v8m_m to decide the profile and the Thumb ISA.
	* testsuite/gas/arm/archv8m-cmse.s: New file.
	* testsuite/gas/arm/archv8m-cmse-main.s: Likewise..
	* testsuite/gas/arm/archv8m-cmse-msr.s: Likewise.
	* testsuite/gas/arm/any-cmse.d: Likewise.
	* testsuite/gas/arm/any-cmse-main.d: Likewise.
	* testsuite/gas/arm/archv8m-cmse-base.d: Likewise.
	* testsuite/gas/arm/archv8m-cmse-msr-base.d: Likewise.
	* testsuite/gas/arm/archv8m-cmse-main-1.d: Likewise.
	* testsuite/gas/arm/archv8m-cmse-main-2.d: Likewise.
	* testsuite/gas/arm/archv8m-cmse-msr-main.d: Likewise.

include/
	* opcode/arm.h (ARM_EXT2_V8M_MAIN): new feature bit.
	(ARM_AEXT2_V8M_MAIN): New architecture extension feature set.
	(ARM_ARCH_V8M_MAIN): Use ARM_AEXT2_V8M_MAIN instead of ARM_AEXT2_V8M
	for the high core bits.

opcodes/
	* arm-dis.c (coprocessor_opcodes): Add entries for VFP ARMv8-M
	Mainline Security Extensions instructions.
	(thumb_opcodes): Add entries for narrow ARMv8-M Security
	Extensions instructions.
	(thumb32_opcodes): Add entries for wide ARMv8-M Security Extensions
	instructions.
	(psr_name): Add new MSP_NS and PSP_NS ARMv8-M Security Extensions
	special registers.