M68K TLS support.

M68K TLS support.

	* configure.ac (m68k-*-*): Check if binutils support TLS.
	* configure: Regenerate.
	* config/m68k/predicates.md (symbolic_operand): Extend comment.
	* config/m68k/constraints.md (Cu): New constraint.
	* config/m68k/m68k.md (UNSPEC_GOTOFF): Remove.
	(UNSPEC_RELOC16, UNSPEC_RELOC32): New constants.
	(movsi): Handle TLS symbols.
	(addsi3_5200): Handle XTLS symbols, indent.
	* config/m68k/m68k-protos.h (m68k_legitimize_tls_address): Declare.
	(m68k_tls_reference_p): Declare.
	(m68k_legitimize_address): Declare.
	(m68k_unwrap_symbol): Declare.
	* config/m68k/m68k.opt (mxtls): New option.
	* config/m68k/m68k.c (ggc.h): Include.
	(m68k_output_dwarf_dtprel): Implement hook.
	(TARGET_HAVE_TLS, TARGET_ASM_OUTPUT_DWARF_DTPREL): Define.
	(m68k_expand_prologue): Load GOT pointer when function needs it.
	(m68k_illegitimate_symbolic_constant_p): Handle TLS symbols.
	(m68k_legitimate_constant_address_p): Same.
	(m68k_decompose_address): Handle TLS references.
	(m68k_get_gp): New static function.
	(enum m68k_reloc): New contants.
	(TLS_RELOC_P): New macro.
	(m68k_wrap_symbol): New static function.
	(m68k_unwrap_symbol): New function.
	(m68k_final_prescan_insn_1): New static function.
	(m68k_final_prescan_insn): New function.
	(m68k_move_to_reg, m68k_wrap_symbol_into_got_ref): New static
	functions.
	(legitimize_pic_address): Handle TLS references..
	(m68k_tls_get_addr, m68k_get_tls_get_addr)
	(m68k_libcall_value_in_a0_p)
	(m68k_call_tls_get_addr, m68k_read_tp, m68k_get_m68k_read_tp)
	(m68k_call_m68k_read_tp): Helper variables and functions for ...
	(m68k_legitimize_tls_address): Handle TLS references.
	(m68k_tls_symbol_p, m68k_tls_reference_p_1, m68k_tls_reference_p):
	New functions.
	(m68k_legitimize_address): Handle TLS symbols.
	(m68k_get_reloc_decoration): New static function.
	(m68k_output_addr_const_extra): Handle UNSPEC_RELOC16 and
	UNSPEC_RELOC32.
	(m68k_output_dwarf_dtprel): Implement hook.
	(print_operand_address): Handle UNSPEC_RELOC16 adn UNSPEC_RELOC32.
	(m68k_libcall_value): Return result in A0 instead of D0 when asked by
	m68k_call_* routines.
	(sched_attr_op_type): Handle TLS symbols.
	(gt-m68k.h): Include.
	* config/m68k/m68k.h (FINAL_PRESCAN_INSN): Define.
	(LEGITIMATE_PIC_OPERAND_P): Support TLS.

	* gcc.target/m68k/tls-ie.c: New test.
	* gcc.target/m68k/tls-le.c: New test.
	* gcc.target/m68k/tls-gd.c: New test.
	* gcc.target/m68k/tls-ld.c: New test.
	* gcc.target/m68k/tls-ie-xgot.c: New test.
	* gcc.target/m68k/tls-le-xtls.c: New test.
	* gcc.target/m68k/tls-gd-xgot.c: New test.
	* gcc.target/m68k/tls-ld-xgot.c: New test.
	* gcc.target/m68k/tls-ld-xtls.c: New test.
	* gcc.target/m68k/tls-ld-xgot-xtls.c: New test.

From-SVN: r147654