bpf, tests: Add tests for BPF_CMPXCHG
Tests for BPF_CMPXCHG with both word and double word operands. As with
the tests for other atomic operations, these tests only check the result
of the arithmetic operation. The atomicity of the operations is not tested.
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/20210809091829.810076-14-johan.almbladh@anyfinetworks.com
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 855f640..d05fe7b 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -5690,6 +5690,172 @@ static struct bpf_test tests[] = {
#undef BPF_ATOMIC_OP_TEST2
#undef BPF_ATOMIC_OP_TEST3
#undef BPF_ATOMIC_OP_TEST4
+ /* BPF_ATOMIC | BPF_W, BPF_CMPXCHG */
+ {
+ "BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful return",
+ .u.insns_int = {
+ BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0x01234567 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful store",
+ .u.insns_int = {
+ BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_LDX_MEM(BPF_W, R0, R10, -40),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0x89abcdef } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure return",
+ .u.insns_int = {
+ BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
+ BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0x01234567 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure store",
+ .u.insns_int = {
+ BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
+ BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_LDX_MEM(BPF_W, R0, R10, -40),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0x01234567 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test side effects",
+ .u.insns_int = {
+ BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
+ BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
+ BPF_ALU32_REG(BPF_MOV, R0, R3),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0x89abcdef } },
+ .stack_depth = 40,
+ },
+ /* BPF_ATOMIC | BPF_DW, BPF_CMPXCHG */
+ {
+ "BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful return",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
+ BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_STX_MEM(BPF_DW, R10, R1, -40),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
+ BPF_JMP_REG(BPF_JNE, R0, R1, 1),
+ BPF_ALU64_REG(BPF_SUB, R0, R1),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful store",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
+ BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_STX_MEM(BPF_DW, R10, R0, -40),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
+ BPF_LDX_MEM(BPF_DW, R0, R10, -40),
+ BPF_JMP_REG(BPF_JNE, R0, R2, 1),
+ BPF_ALU64_REG(BPF_SUB, R0, R2),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure return",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
+ BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_ALU64_IMM(BPF_ADD, R0, 1),
+ BPF_STX_MEM(BPF_DW, R10, R1, -40),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
+ BPF_JMP_REG(BPF_JNE, R0, R1, 1),
+ BPF_ALU64_REG(BPF_SUB, R0, R1),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure store",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
+ BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_ALU64_IMM(BPF_ADD, R0, 1),
+ BPF_STX_MEM(BPF_DW, R10, R1, -40),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
+ BPF_LDX_MEM(BPF_DW, R0, R10, -40),
+ BPF_JMP_REG(BPF_JNE, R0, R1, 1),
+ BPF_ALU64_REG(BPF_SUB, R0, R1),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 40,
+ },
+ {
+ "BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test side effects",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
+ BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_STX_MEM(BPF_DW, R10, R1, -40),
+ BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
+ BPF_LD_IMM64(R0, 0xfecdba9876543210ULL),
+ BPF_JMP_REG(BPF_JNE, R0, R2, 1),
+ BPF_ALU64_REG(BPF_SUB, R0, R2),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 40,
+ },
/* BPF_JMP32 | BPF_JEQ | BPF_K */
{
"JMP32_JEQ_K: Small immediate",