bpf/verifier/atomic_xchg.c

0001 {
0002     "atomic exchange smoketest - 64bit",
0003     .insns = {
0004         /* val = 3; */
0005         BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
0006         /* old = atomic_xchg(&val, 4); */
0007         BPF_MOV64_IMM(BPF_REG_1, 4),
0008         BPF_ATOMIC_OP(BPF_DW, BPF_XCHG, BPF_REG_10, BPF_REG_1, -8),
0009         /* if (old != 3) exit(1); */
0010         BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
0011         BPF_MOV64_IMM(BPF_REG_0, 1),
0012         BPF_EXIT_INSN(),
0013         /* if (val != 4) exit(2); */
0014         BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
0015         BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
0016         BPF_MOV64_IMM(BPF_REG_0, 2),
0017         BPF_EXIT_INSN(),
0018         /* exit(0); */
0019         BPF_MOV64_IMM(BPF_REG_0, 0),
0020         BPF_EXIT_INSN(),
0021     },
0022     .result = ACCEPT,
0023 },
0024 {
0025     "atomic exchange smoketest - 32bit",
0026     .insns = {
0027         /* val = 3; */
0028         BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 3),
0029         /* old = atomic_xchg(&val, 4); */
0030         BPF_MOV32_IMM(BPF_REG_1, 4),
0031         BPF_ATOMIC_OP(BPF_W, BPF_XCHG, BPF_REG_10, BPF_REG_1, -4),
0032         /* if (old != 3) exit(1); */
0033         BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
0034         BPF_MOV32_IMM(BPF_REG_0, 1),
0035         BPF_EXIT_INSN(),
0036         /* if (val != 4) exit(2); */
0037         BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
0038         BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
0039         BPF_MOV32_IMM(BPF_REG_0, 2),
0040         BPF_EXIT_INSN(),
0041         /* exit(0); */
0042         BPF_MOV32_IMM(BPF_REG_0, 0),
0043         BPF_EXIT_INSN(),
0044     },
0045     .result = ACCEPT,
0046 },