D17281.id48380.diff
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	Index: sys/amd64/amd64/support.S
	===================================================================
	--- sys/amd64/amd64/support.S
	+++ sys/amd64/amd64/support.S
	@@ -1023,34 +1023,33 @@
	PUSH_FRAME_POINTER
	movq %rdx,%r8 /* %r8 = maxlen */

	- xchgq %rdi,%rsi
	- incq %rdx
	+ incq %rdx
	1:
	decq %rdx
	jz 4f
	- lodsb
	- stosb
	- orb %al,%al
	+ movb (%rdi),%al
	+ movb %al,(%rsi)
	+ incq %rsi
	+ incq %rdi
	+ testb %al,%al
	jnz 1b

	/* Success -- 0 byte reached */
	decq %rdx
	xorl %eax,%eax
	- jmp 6f
	-4:
	- /* rdx is zero -- return ENAMETOOLONG */
	- movq $ENAMETOOLONG,%rax
	-
	-6:
	-
	+2:
	testq %rcx,%rcx
	- jz 7f
	+ jz 3f
	/* set lencopied and return %rax /
	subq %rdx,%r8
	movq %r8,(%rcx)
	-7:
	+3:
	POP_FRAME_POINTER
	ret
	+4:
	+ /* rdx is zero -- return ENAMETOOLONG */
	+ movl $ENAMETOOLONG,%eax
	+ jmp 2b
	END(copystr)

	/*