1 /* SPDX-License-Identifier: GPL-2.0 */
3 #undef TRACE_SYSTEM_VAR
5 #ifdef CONFIG_BPF_EVENTS
10 #undef __get_dynamic_array
11 #define __get_dynamic_array(field) \
12 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
14 #undef __get_dynamic_array_len
15 #define __get_dynamic_array_len(field) \
16 ((__entry->__data_loc_##field >> 16) & 0xffff)
19 #define __get_str(field) ((char *)__get_dynamic_array(field))
22 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
25 #define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field))
27 #undef __get_rel_dynamic_array
28 #define __get_rel_dynamic_array(field) \
29 ((void *)(&__entry->__rel_loc_##field) + \
30 sizeof(__entry->__rel_loc_##field) + \
31 (__entry->__rel_loc_##field & 0xffff))
33 #undef __get_rel_dynamic_array_len
34 #define __get_rel_dynamic_array_len(field) \
35 ((__entry->__rel_loc_##field >> 16) & 0xffff)
38 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
40 #undef __get_rel_bitmask
41 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
43 #undef __get_rel_sockaddr
44 #define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field))
47 #define __perf_count(c) (c)
50 #define __perf_task(t) (t)
52 /* cast any integer, pointer, or small struct to u64 */
53 #define UINTTYPE(size) \
54 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \
55 __builtin_choose_expr(size == 2, (u16)2, \
56 __builtin_choose_expr(size == 4, (u32)3, \
57 __builtin_choose_expr(size == 8, (u64)4, \
59 #define __CAST_TO_U64(x) ({ \
60 typeof(x) __src = (x); \
61 UINTTYPE(sizeof(x)) __dst; \
62 memcpy(&__dst, &__src, sizeof(__dst)); \
65 #define __CAST1(a,...) __CAST_TO_U64(a)
66 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)
67 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)
68 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)
69 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)
70 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)
71 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)
72 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)
73 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)
74 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)
75 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)
76 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
77 /* tracepoints with more than 12 arguments will hit build error */
78 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
80 #define __BPF_DECLARE_TRACE(call, proto, args) \
82 __bpf_trace_##call(void *__data, proto) \
84 struct bpf_prog *prog = __data; \
85 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \
88 #undef DECLARE_EVENT_CLASS
89 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
90 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))
93 * This part is compiled out, it is only here as a build time check
94 * to make sure that if the tracepoint handling changes, the
95 * bpf probe will fail to compile unless it too is updated.
97 #define __DEFINE_EVENT(template, call, proto, args, size) \
98 static inline void bpf_test_probe_##call(void) \
100 check_trace_callback_type_##call(__bpf_trace_##template); \
102 typedef void (*btf_trace_##call)(void *__data, proto); \
104 struct bpf_raw_event_map event; \
105 btf_trace_##call handler; \
106 } __bpf_trace_tp_map_##call __used \
107 __section("__bpf_raw_tp_map") = { \
109 .tp = &__tracepoint_##call, \
110 .bpf_func = __bpf_trace_##template, \
111 .num_args = COUNT_ARGS(args), \
112 .writable_size = size, \
116 #define FIRST(x, ...) x
118 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \
119 static inline void bpf_test_buffer_##call(void) \
121 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
122 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \
123 * dead-code-eliminated. \
126 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \
129 #undef DEFINE_EVENT_WRITABLE
130 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
131 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
132 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
135 #define DEFINE_EVENT(template, call, proto, args) \
136 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
138 #undef DEFINE_EVENT_PRINT
139 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
140 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
143 #define DECLARE_TRACE(call, proto, args) \
144 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
145 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0)
147 #undef DECLARE_TRACE_WRITABLE
148 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \
149 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
150 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
151 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size)
153 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
155 #undef DECLARE_TRACE_WRITABLE
156 #undef DEFINE_EVENT_WRITABLE
157 #undef __CHECK_WRITABLE_BUF_SIZE
158 #undef __DEFINE_EVENT
161 #endif /* CONFIG_BPF_EVENTS */