Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#undef TRACE_SYSTEM_VAR
4
5#ifdef CONFIG_BPF_EVENTS
6
7#undef __entry
8#define __entry entry
9
10#undef __get_dynamic_array
11#define __get_dynamic_array(field) \
12 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
13
14#undef __get_dynamic_array_len
15#define __get_dynamic_array_len(field) \
16 ((__entry->__data_loc_##field >> 16) & 0xffff)
17
18#undef __get_str
19#define __get_str(field) ((char *)__get_dynamic_array(field))
20
21#undef __get_bitmask
22#define __get_bitmask(field) (char *)__get_dynamic_array(field)
23
24#undef __get_cpumask
25#define __get_cpumask(field) (char *)__get_dynamic_array(field)
26
27#undef __get_sockaddr
28#define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field))
29
30#undef __get_rel_dynamic_array
31#define __get_rel_dynamic_array(field) \
32 ((void *)(&__entry->__rel_loc_##field) + \
33 sizeof(__entry->__rel_loc_##field) + \
34 (__entry->__rel_loc_##field & 0xffff))
35
36#undef __get_rel_dynamic_array_len
37#define __get_rel_dynamic_array_len(field) \
38 ((__entry->__rel_loc_##field >> 16) & 0xffff)
39
40#undef __get_rel_str
41#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
42
43#undef __get_rel_bitmask
44#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
45
46#undef __get_rel_cpumask
47#define __get_rel_cpumask(field) (char *)__get_rel_dynamic_array(field)
48
49#undef __get_rel_sockaddr
50#define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field))
51
52#undef __perf_count
53#define __perf_count(c) (c)
54
55#undef __perf_task
56#define __perf_task(t) (t)
57
58/* cast any integer, pointer, or small struct to u64 */
59#define UINTTYPE(size) \
60 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \
61 __builtin_choose_expr(size == 2, (u16)2, \
62 __builtin_choose_expr(size == 4, (u32)3, \
63 __builtin_choose_expr(size == 8, (u64)4, \
64 (void)5)))))
65#define __CAST_TO_U64(x) ({ \
66 typeof(x) __src = (x); \
67 UINTTYPE(sizeof(x)) __dst; \
68 memcpy(&__dst, &__src, sizeof(__dst)); \
69 (u64)__dst; })
70
71#define __CAST1(a,...) __CAST_TO_U64(a)
72#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)
73#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)
74#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)
75#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)
76#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)
77#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)
78#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)
79#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)
80#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)
81#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)
82#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
83/* tracepoints with more than 12 arguments will hit build error */
84#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
85
86#define __BPF_DECLARE_TRACE(call, proto, args) \
87static notrace void \
88__bpf_trace_##call(void *__data, proto) \
89{ \
90 struct bpf_prog *prog = __data; \
91 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \
92}
93
94#undef DECLARE_EVENT_CLASS
95#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
96 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))
97
98/*
99 * This part is compiled out, it is only here as a build time check
100 * to make sure that if the tracepoint handling changes, the
101 * bpf probe will fail to compile unless it too is updated.
102 */
103#define __DEFINE_EVENT(template, call, proto, args, size) \
104static inline void bpf_test_probe_##call(void) \
105{ \
106 check_trace_callback_type_##call(__bpf_trace_##template); \
107} \
108typedef void (*btf_trace_##call)(void *__data, proto); \
109static union { \
110 struct bpf_raw_event_map event; \
111 btf_trace_##call handler; \
112} __bpf_trace_tp_map_##call __used \
113__section("__bpf_raw_tp_map") = { \
114 .event = { \
115 .tp = &__tracepoint_##call, \
116 .bpf_func = __bpf_trace_##template, \
117 .num_args = COUNT_ARGS(args), \
118 .writable_size = size, \
119 }, \
120};
121
122#define FIRST(x, ...) x
123
124#define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \
125static inline void bpf_test_buffer_##call(void) \
126{ \
127 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
128 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \
129 * dead-code-eliminated. \
130 */ \
131 FIRST(proto); \
132 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \
133}
134
135#undef DEFINE_EVENT_WRITABLE
136#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
137 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
138 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
139
140#undef DEFINE_EVENT
141#define DEFINE_EVENT(template, call, proto, args) \
142 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
143
144#undef DEFINE_EVENT_PRINT
145#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
146 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
147
148#undef DECLARE_TRACE
149#define DECLARE_TRACE(call, proto, args) \
150 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
151 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0)
152
153#undef DECLARE_TRACE_WRITABLE
154#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \
155 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
156 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \
157 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size)
158
159#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
160
161#undef DECLARE_TRACE_WRITABLE
162#undef DEFINE_EVENT_WRITABLE
163#undef __CHECK_WRITABLE_BUF_SIZE
164#undef __DEFINE_EVENT
165#undef FIRST
166
167#endif /* CONFIG_BPF_EVENTS */