Commit e5009b46 authored by Johan Almbladh's avatar Johan Almbladh Committed by Daniel Borkmann
Browse files

bpf, tests: Add word-order tests for load/store of double words 



A double word (64-bit) load/store may be implemented as two successive
32-bit operations, one for each word. Check that the order of those
operations is consistent with the machine endianness.

Signed-off-by: default avatarJohan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarYonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210809091829.810076-10-johan.almbladh@anyfinetworks.com
parent 84024a4e

lib/test_bpf.c

+36 −0
Original line number Diff line number Diff line
@@ -5420,6 +5420,42 @@ static struct bpf_test tests[] = { 
		{ { 0, 0xffffffff } },

		.stack_depth = 40,

	},

	{

		"STX_MEM_DW: Store double word: first word in memory",

		.u.insns_int = {

			BPF_LD_IMM64(R0, 0),

			BPF_LD_IMM64(R1, 0x0123456789abcdefLL),

			BPF_STX_MEM(BPF_DW, R10, R1, -40),

			BPF_LDX_MEM(BPF_W, R0, R10, -40),

			BPF_EXIT_INSN(),

		},

		INTERNAL,

		{ },

#ifdef __BIG_ENDIAN

		{ { 0, 0x01234567 } },

#else

		{ { 0, 0x89abcdef } },

#endif

		.stack_depth = 40,

	},

	{

		"STX_MEM_DW: Store double word: second word in memory",

		.u.insns_int = {

			BPF_LD_IMM64(R0, 0),

			BPF_LD_IMM64(R1, 0x0123456789abcdefLL),

			BPF_STX_MEM(BPF_DW, R10, R1, -40),

			BPF_LDX_MEM(BPF_W, R0, R10, -36),

			BPF_EXIT_INSN(),

		},

		INTERNAL,

		{ },

#ifdef __BIG_ENDIAN

		{ { 0, 0x89abcdef } },

#else

		{ { 0, 0x01234567 } },

#endif

		.stack_depth = 40,

	},

	/* BPF_STX | BPF_ATOMIC | BPF_W/DW */

	{

		"STX_XADD_W: Test: 0x12 + 0x10 = 0x22",