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

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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: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210809091829.810076-10-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-08-09 11:18:24 +02:00 committed by Daniel Borkmann
parent 84024a4e86
commit e5009b4636
1 changed files with 36 additions and 0 deletions
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36
lib/test_bpf.c
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@ -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",