1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2023 SUSE LLC */
3 #include <linux/bpf.h>
4 #include <bpf/bpf_helpers.h>
5 #include "bpf_misc.h"
6
7 SEC("?raw_tp")
8 __success __log_level(2)
9 __msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
10 __msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0xfffffff8 goto pc+2")
11 __msg("mark_precise: frame0: regs=r2 stack= before 1: (87) r2 = -r2")
12 __msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 8")
13 __naked int bpf_neg(void)
14 {
15 asm volatile (
16 "r2 = 8;"
17 "r2 = -r2;"
18 "if r2 != -8 goto 1f;"
19 "r1 = r10;"
20 "r1 += r2;"
21 "1:"
22 "r0 = 0;"
23 "exit;"
24 ::: __clobber_all);
25 }
26
27 SEC("?raw_tp")
28 __success __log_level(2)
29 __msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
30 __msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
31 __msg("mark_precise: frame0: regs=r2 stack= before 1: (d4) r2 = le16 r2")
32 __msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
33 __naked int bpf_end_to_le(void)
34 {
35 asm volatile (
36 "r2 = 0;"
37 "r2 = le16 r2;"
38 "if r2 != 0 goto 1f;"
39 "r1 = r10;"
40 "r1 += r2;"
41 "1:"
42 "r0 = 0;"
43 "exit;"
44 ::: __clobber_all);
45 }
46
47
48 SEC("?raw_tp")
49 __success __log_level(2)
50 __msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
51 __msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
52 __msg("mark_precise: frame0: regs=r2 stack= before 1: (dc) r2 = be16 r2")
53 __msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
54 __naked int bpf_end_to_be(void)
55 {
56 asm volatile (
57 "r2 = 0;"
58 "r2 = be16 r2;"
59 "if r2 != 0 goto 1f;"
60 "r1 = r10;"
61 "r1 += r2;"
62 "1:"
63 "r0 = 0;"
64 "exit;"
65 ::: __clobber_all);
66 }
67
68 #if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
69 (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) || \
70 defined(__TARGET_ARCH_arm) || defined(__TARGET_ARCH_s390)) && \
71 __clang_major__ >= 18
72
73 SEC("?raw_tp")
74 __success __log_level(2)
75 __msg("mark_precise: frame0: regs=r2 stack= before 3: (bf) r1 = r10")
76 __msg("mark_precise: frame0: regs=r2 stack= before 2: (55) if r2 != 0x0 goto pc+2")
77 __msg("mark_precise: frame0: regs=r2 stack= before 1: (d7) r2 = bswap16 r2")
78 __msg("mark_precise: frame0: regs=r2 stack= before 0: (b7) r2 = 0")
79 __naked int bpf_end_bswap(void)
80 {
81 asm volatile (
82 "r2 = 0;"
83 "r2 = bswap16 r2;"
84 "if r2 != 0 goto 1f;"
85 "r1 = r10;"
86 "r1 += r2;"
87 "1:"
88 "r0 = 0;"
89 "exit;"
90 ::: __clobber_all);
91 }
92
93 #endif /* v4 instruction */
94
95 SEC("?raw_tp")
96 __success __log_level(2)
97 /*
98 * Without the bug fix there will be no history between "last_idx 3 first_idx 3"
99 * and "parent state regs=" lines. "R0_w=6" parts are here to help anchor
100 * expected log messages to the one specific mark_chain_precision operation.
101 *
102 * This is quite fragile: if verifier checkpointing heuristic changes, this
103 * might need adjusting.
104 */
105 __msg("2: (07) r0 += 1 ; R0_w=6")
106 __msg("3: (35) if r0 >= 0xa goto pc+1")
107 __msg("mark_precise: frame0: last_idx 3 first_idx 3 subseq_idx -1")
108 __msg("mark_precise: frame0: regs=r0 stack= before 2: (07) r0 += 1")
109 __msg("mark_precise: frame0: regs=r0 stack= before 1: (07) r0 += 1")
110 __msg("mark_precise: frame0: regs=r0 stack= before 4: (05) goto pc-4")
111 __msg("mark_precise: frame0: regs=r0 stack= before 3: (35) if r0 >= 0xa goto pc+1")
112 __msg("mark_precise: frame0: parent state regs= stack=: R0_rw=P4")
113 __msg("3: R0_w=6")
114 __naked int state_loop_first_last_equal(void)
115 {
116 asm volatile (
117 "r0 = 0;"
118 "l0_%=:"
119 "r0 += 1;"
120 "r0 += 1;"
121 /* every few iterations we'll have a checkpoint here with
122 * first_idx == last_idx, potentially confusing precision
123 * backtracking logic
124 */
125 "if r0 >= 10 goto l1_%=;" /* checkpoint + mark_precise */
126 "goto l0_%=;"
127 "l1_%=:"
128 "exit;"
129 ::: __clobber_common
130 );
131 }
132
133 char _license[] SEC("license") = "GPL";
134
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