1 {
2 	"atomic compare-and-exchange smoketest - 64bit",
3 	.insns = {
4 		/* val = 3; */
5 		BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
6 		/* old = atomic_cmpxchg(&val, 2, 4); */
7 		BPF_MOV64_IMM(BPF_REG_1, 4),
8 		BPF_MOV64_IMM(BPF_REG_0, 2),
9 		BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
10 		/* if (old != 3) exit(2); */
11 		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
12 		BPF_MOV64_IMM(BPF_REG_0, 2),
13 		BPF_EXIT_INSN(),
14 		/* if (val != 3) exit(3); */
15 		BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
16 		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
17 		BPF_MOV64_IMM(BPF_REG_0, 3),
18 		BPF_EXIT_INSN(),
19 		/* old = atomic_cmpxchg(&val, 3, 4); */
20 		BPF_MOV64_IMM(BPF_REG_1, 4),
21 		BPF_MOV64_IMM(BPF_REG_0, 3),
22 		BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
23 		/* if (old != 3) exit(4); */
24 		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
25 		BPF_MOV64_IMM(BPF_REG_0, 4),
26 		BPF_EXIT_INSN(),
27 		/* if (val != 4) exit(5); */
28 		BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
29 		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
30 		BPF_MOV64_IMM(BPF_REG_0, 5),
31 		BPF_EXIT_INSN(),
32 		/* exit(0); */
33 		BPF_MOV64_IMM(BPF_REG_0, 0),
34 		BPF_EXIT_INSN(),
35 	},
36 	.result = ACCEPT,
37 },
38 {
39 	"atomic compare-and-exchange smoketest - 32bit",
40 	.insns = {
41 		/* val = 3; */
42 		BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 3),
43 		/* old = atomic_cmpxchg(&val, 2, 4); */
44 		BPF_MOV32_IMM(BPF_REG_1, 4),
45 		BPF_MOV32_IMM(BPF_REG_0, 2),
46 		BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -4),
47 		/* if (old != 3) exit(2); */
48 		BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
49 		BPF_MOV32_IMM(BPF_REG_0, 2),
50 		BPF_EXIT_INSN(),
51 		/* if (val != 3) exit(3); */
52 		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
53 		BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
54 		BPF_MOV32_IMM(BPF_REG_0, 3),
55 		BPF_EXIT_INSN(),
56 		/* old = atomic_cmpxchg(&val, 3, 4); */
57 		BPF_MOV32_IMM(BPF_REG_1, 4),
58 		BPF_MOV32_IMM(BPF_REG_0, 3),
59 		BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -4),
60 		/* if (old != 3) exit(4); */
61 		BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 3, 2),
62 		BPF_MOV32_IMM(BPF_REG_0, 4),
63 		BPF_EXIT_INSN(),
64 		/* if (val != 4) exit(5); */
65 		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
66 		BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
67 		BPF_MOV32_IMM(BPF_REG_0, 5),
68 		BPF_EXIT_INSN(),
69 		/* exit(0); */
70 		BPF_MOV32_IMM(BPF_REG_0, 0),
71 		BPF_EXIT_INSN(),
72 	},
73 	.result = ACCEPT,
74 },
75 {
76 	"Can't use cmpxchg on uninit src reg",
77 	.insns = {
78 		BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
79 		BPF_MOV64_IMM(BPF_REG_0, 3),
80 		BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_2, -8),
81 		BPF_EXIT_INSN(),
82 	},
83 	.result = REJECT,
84 	.errstr = "!read_ok",
85 },
86 {
87 	"Can't use cmpxchg on uninit memory",
88 	.insns = {
89 		BPF_MOV64_IMM(BPF_REG_0, 3),
90 		BPF_MOV64_IMM(BPF_REG_2, 4),
91 		BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, BPF_REG_10, BPF_REG_2, -8),
92 		BPF_EXIT_INSN(),
93 	},
94 	.result = REJECT,
95 	.errstr = "invalid read from stack",
96 },
97 {
98 	"BPF_W cmpxchg should zero top 32 bits",
99 	.insns = {
100 		/* r0 = U64_MAX; */
101 		BPF_MOV64_IMM(BPF_REG_0, 0),
102 		BPF_ALU64_IMM(BPF_SUB, BPF_REG_0, 1),
103 		/* u64 val = r0; */
104 		BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
105 		/* r0 = (u32)atomic_cmpxchg((u32 *)&val, r0, 1); */
106 		BPF_MOV32_IMM(BPF_REG_1, 1),
107 		BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, BPF_REG_10, BPF_REG_1, -8),
108 		/* r1 = 0x00000000FFFFFFFFull; */
109 		BPF_MOV64_IMM(BPF_REG_1, 1),
110 		BPF_ALU64_IMM(BPF_LSH, BPF_REG_1, 32),
111 		BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 1),
112 		/* if (r0 != r1) exit(1); */
113 		BPF_JMP_REG(BPF_JEQ, BPF_REG_0, BPF_REG_1, 2),
114 		BPF_MOV32_IMM(BPF_REG_0, 1),
115 		BPF_EXIT_INSN(),
116 		/* exit(0); */
117 		BPF_MOV32_IMM(BPF_REG_0, 0),
118 		BPF_EXIT_INSN(),
119 	},
120 	.result = ACCEPT,
121 },
122