tests/stxb.data - third_party/github.com/iovisor/ubpf - Git at Google

 -- asm
 mov32 %r2, 0x11
 stxb [%r1+2], %r2
 ldxb %r0, [%r1+2]
 exit
 -- mem
 aa bb ff cc dd
 -- result
 0x11
	-- asm
	mov32 %r2, 0x11
	stxb [%r1+2], %r2
	ldxb %r0, [%r1+2]
	exit
	-- mem
	aa bb ff cc dd
	-- result
	0x11