tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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 __perf_count
25#define __perf_count(c) (c)
26
27#undef __perf_task
28#define __perf_task(t) (t)
29
30/* cast any integer, pointer, or small struct to u64 */
31#define UINTTYPE(size) \
32 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \
33 __builtin_choose_expr(size == 2, (u16)2, \
34 __builtin_choose_expr(size == 4, (u32)3, \
35 __builtin_choose_expr(size == 8, (u64)4, \
36 (void)5)))))
37#define __CAST_TO_U64(x) ({ \
38 typeof(x) __src = (x); \
39 UINTTYPE(sizeof(x)) __dst; \
40 memcpy(&__dst, &__src, sizeof(__dst)); \
41 (u64)__dst; })
42
43#define __CAST1(a,...) __CAST_TO_U64(a)
44#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)
45#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)
46#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)
47#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)
48#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)
49#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)
50#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)
51#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)
52#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)
53#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)
54#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
55/* tracepoints with more than 12 arguments will hit build error */
56#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
57
58#undef DECLARE_EVENT_CLASS
59#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
60static notrace void \
61__bpf_trace_##call(void *__data, proto) \
62{ \
63 struct bpf_prog *prog = __data; \
64 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \
65}
66
67/*
68 * This part is compiled out, it is only here as a build time check
69 * to make sure that if the tracepoint handling changes, the
70 * bpf probe will fail to compile unless it too is updated.
71 */
72#define __DEFINE_EVENT(template, call, proto, args, size) \
73static inline void bpf_test_probe_##call(void) \
74{ \
75 check_trace_callback_type_##call(__bpf_trace_##template); \
76} \
77static struct bpf_raw_event_map __used \
78 __attribute__((section("__bpf_raw_tp_map"))) \
79__bpf_trace_tp_map_##call = { \
80 .tp = &__tracepoint_##call, \
81 .bpf_func = (void *)__bpf_trace_##template, \
82 .num_args = COUNT_ARGS(args), \
83 .writable_size = size, \
84};
85
86#define FIRST(x, ...) x
87
88#undef DEFINE_EVENT_WRITABLE
89#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
90static inline void bpf_test_buffer_##call(void) \
91{ \
92 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
93 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \
94 * dead-code-eliminated. \
95 */ \
96 FIRST(proto); \
97 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \
98} \
99__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
100
101#undef DEFINE_EVENT
102#define DEFINE_EVENT(template, call, proto, args) \
103 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
104
105#undef DEFINE_EVENT_PRINT
106#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
107 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
108
109#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
110
111#undef DEFINE_EVENT_WRITABLE
112#undef __DEFINE_EVENT
113#undef FIRST
114
115#endif /* CONFIG_BPF_EVENTS */