gcc/
	* config/bfin/linux.h (TARGET_SUPPORTS_SYNC_CALLS): Define to 1.
	* config/bfin/uclinux.h (TARGET_SUPPORTS_SYNC_CALLS): Define to 1.
	* config/bfin/bfin.h (TARGET_SUPPORTS_SYNC_CALLS): Provide default of
	0.
	* config/bfin/sync.md: New file.
	* config/bfin/bfin.md: Include it.
	(UNSPEC_ATOMIC): New.
	(UNSPEC_ONES): Provide a unique number.

	From Jie Zhang <jie.zhang@analog.com>:
	* config/bfin/bfin.c (ret_regs): New.
	(must_save_fp_p): Don't return true because of frame_pointer_needed.
	(must_save_rets_p): New.
	(n_regs_saved_by_prologue): Use must_save_rets_p instead of
	current_function_is_leaf.
	(do_link): Likewise.
	(do_unlink): Likewise.
	(expand_interrupt_handler_prologue): Use ret_regs array.
	(expand_interrupt_handler_epilogue): Use ret_regs array and
	pass return register to gen_return_internal.
	(bfin_expand_epilogue): Pass return register to
	gen_return_internal.
	(bfin_expand_call): Explicitly clobber RETS.
	* config/bfin/bfin.h (FUNCTION_RETURN_REGISTERS): Define.
	* config/bfin/bfin.md (call_symbol_fdpic, call_value_symbol_fdpic,
	call_insn_fdpic, call_value_insn_fdpic, call_symbol,
	call_value_symbol, call_insn, call_value_insn): Explicitly clobber
	RETS.
	(return_internal): Take a reg rtx rather than the register number.

gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_sync_int_long):
	Supported on Blackfin Linux targets.

From-SVN: r151381