1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #undef TRACE_SYSTEM_VAR
4
5 #ifdef CONFIG_BPF_EVENTS
6
7 #include "stages/stage6_event_callback.h"
8
9 #undef __perf_count
10 #define __perf_count(c) (c)
11
12 #undef __perf_task
13 #define __perf_task(t) (t)
14
15 #include <linux/args.h>
16
17 /* cast any integer, pointer, or small struct to u64 */
18 #define UINTTYPE(size) \
19 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \
20 __builtin_choose_expr(size == 2, (u16)2, \
21 __builtin_choose_expr(size == 4, (u32)3, \
22 __builtin_choose_expr(size == 8, (u64)4, \
23 (void)5)))))
24 #define __CAST_TO_U64(x) ({ \
25 typeof(x) __src = (x); \
26 UINTTYPE(sizeof(x)) __dst; \
27 memcpy(&__dst, &__src, sizeof(__dst)); \
28 (u64)__dst; })
29
30 #define __CAST1(a,...) __CAST_TO_U64(a)
31 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)
32 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)
33 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)
34 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)
35 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)
36 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)
37 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)
38 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)
39 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)
40 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)
41 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
42 /* tracepoints with more than 12 arguments will hit build error */
43 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
44
45 #define __BPF_DECLARE_TRACE(call, proto, args) \
46 static notrace void \
47 __bpf_trace_##call(void *__data, proto) \
48 { \
49 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args)); \
50 }
51
52 #undef DECLARE_EVENT_CLASS
53 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
54 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))
55
56 /*
57 * This part is compiled out, it is only here as a build time check
58 * to make sure that if the tracepoint handling changes, the
59 * bpf probe will fail to compile unless it too is updated.
60 */
61 #define __DEFINE_EVENT(template, call, proto, args, size) \
62 static inline void bpf_test_probe_##call(void) \
63 { \
64 check_trace_callback_type_##call(__bpf_trace_##template); \
65 } \
66 typedef void (*btf_trace_##call)(void *__data, proto); \
67 static union { \
68 struct bpf_raw_event_map event; \
69 btf_trace_##call handler; \
70 } __bpf_trace_tp_map_##call __used \
71 __section("__bpf_raw_tp_map") = { \
72 .event = { \
73 .tp = &__tracepoint_##call, \
74 .bpf_func = __bpf_trace_##template, \
75 .num_args = COUNT_ARGS(args), \
76 .writable_size = size, \
77 }, \
78 };
79
80 #define FIRST(x, ...) x
81
82 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \
83 static inline void bpf_test_buffer_##call(void) \
84 { \
85 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
86 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \
87 * dead-code-eliminated. \
88 */ \
89 FIRST(proto); \
90 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \
91 }
92
93 #undef DEFINE_EVENT_WRITABLE
94 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
95 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
96 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
97
98 #undef DEFINE_EVENT
99 #define DEFINE_EVENT(template, call, proto, args) \
100 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
101
102 #undef DEFINE_EVENT_PRINT
103 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
104 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
105
106 #undef DECLARE_TRACE
107 #define DECLARE_TRACE(call, proto, args) \
108 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
109 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0)
110
111 #undef DECLARE_TRACE_WRITABLE
112 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \
113 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
114 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
115 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size)
116
117 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
118
119 #undef DECLARE_TRACE_WRITABLE
120 #undef DEFINE_EVENT_WRITABLE
121 #undef __CHECK_WRITABLE_BUF_SIZE
122 #undef __DEFINE_EVENT
123 #undef FIRST
124
125 #endif /* CONFIG_BPF_EVENTS */
126
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