* config.gcc <arm>: Add --with-abi=
	* config/arm/arm-protos.h (arm_get_frame_size, thumb_get_frame_size,
	thumb_far_jump_used): Remove prototypes.
	(arm_needs_doubleword_align): Add prototype.
	(thumb_compute_initial_elimination_offset): Ditto.
	* config/arm/arm.c (arm_get_frame_offsets): New function.
	(use_return_insn, output_return_instruction, arm_output_epilogue,
	arm_output_function_epilogue, arm_compute_initial_elimination_offset,
	arm_expand_prologue, thumb_expand_epilogue): Use it.
	(arm_abi, target_abi_name, all_arm_abis): New variables.
	(arm_override_options): Set them.  Set structure padding for AAPCS.
	(arm_return_in_memory): Update ABI check.
	(arm_init_cumulative_args): Initialize can_split.
	(arm_needs_doubleword_align): New function.
	(arm_function_arg): Don't split args after pushing to stack. Handle
	doubleword/even reg alignment.
	(arm_va_arg): Handle all doubleword aligned args.
	(add_minpoolforward ref, dump_minpool, push_minpool_fix): Align based
	on ABI, not CPU.
	(arm_compute_save_reg0_reg12_mask): Fix comment.
	(thumb_get_frame_size, thumb_get_frame_size): Remove.
	(thumb_jump_far_used_p): Remove superfluous argument.  Return save
	value for alignment.
	(thumb_unexpanded_epilogue, thumb_output_function_prologue): Change
	to match.
	(thumb_compute_initial_elimination_offset): New function.
	(thumb_expand_prologue): Use arm_get_frame_offsets.  Remove
	unneccessary rounding.
	* config/arm/arm.h (target_abi_name): Declare.
	(ARM_DOUBLEWORD_ALIGN, DOUBLEWORD_ALIGNMENT, TARGET_IWMMXT_ABI,
	arm_abi_type, ARM_DEFAULT_ABI): Define.
	(ARM_FLAG_ATPCS): Remove.
	(TARGET_OPTIONS, OPTION_DEFAULT_SPECS): Add -mabi=.
	(BIGGEST_ALIGNMENT, PREFERRED_STACK_BOUNDARY, STACK_BOUNDARY): Use it.
	(ADJUST_FIELD_ALIGN, DATA_ALIGNMENT, LOCAL_ALIGNMENT,
	TYPE_NEEDS_IWMMXT_ALIGNMENT): Remove.
	(LIBCALL_VALUE, FUNCTION_VALUE_REGNO_P, FUNCTION_ARG_REGNO_P):
	Contitionalize on ABI, not CPU.
	(struct arm_stack_offsets): Define.
	(struct machine_function): Add stack_offsets.  Remove frame_size.
	(FUNCTION_ARG_PARTIAL_NREGS): Don't split if previous args have been
	pushed.
	(FUNCTION_ARG_ADVANCE, FUNCTION_ARG_BOUNDARY): Handle general
	doubleword alignment.
	(THUMB_INITIAL_ELIMINATION_OFFSET,
	ARM_INITIAL_ELIMINATION_OFFSET): Remove.
	(INITIAL_ELIMINATION_OFFSET): Call functions directly.
	* config/arm/arm.md (align_8): Enable for all targets.
	* config/arm/netbsd-elf.h (TARGET_DEFAULT): Remove TARGET_ATPCS.
	(ARM_DEFAULT_ABI): Define.
	* doc/invoke.texi <ARM>: Document -mabi=. Update documentation for
	-mstructure-size-boundary.

From-SVN: r79921