MOVV	n+8(FP), R5
	MOVW	prot+16(FP), R6
	MOVW	flags+20(FP), R7
	MOVW	fd+24(FP), R8
	MOVW	off+28(FP), R9

	MOVV	$SYS_mmap, R11
	SYSCALL
	MOVW	$-4096, R5
	BGEU	R5, R4, ok
	MOVV	$0, p+32(FP)
	SUBVU	R4, R0, R4
	MOVV	R4, err+40(FP)
	RET
ok:
	MOVV	R4, p+32(FP)
	MOVV	$0, err+40(FP)
	RET

// Call the function stored in _cgo_mmap using the GCC calling convention.