// SetLastError(0).
	MOVL	$0, 0x34(FS)

	MOVL	libcall_n(BX), CX

	// Fast version, do not store args on the stack.
	CMPL	CX, $0
	JE	docall

	// Copy args to the stack.
	MOVL	CX, AX
	SALL	$2, AX
	SUBL	AX, SP			// room for args
	MOVL	SP, DI
	MOVL	libcall_args(BX), SI
	CLD
	REP; MOVSL

docall:
	// Call stdcall or cdecl function.
	// DI SI BP BX are preserved, SP is not
	CALL	libcall_fn(BX)