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#define __BPF_DECLARE_TRACE(call, proto, args)				\
 59static notrace void							\
 60__bpf_trace_##call(void *__data, proto)					\
 61{									\
 62	struct bpf_prog *prog = __data;					\
 63	CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args));	\
 64}
 65
 66#undef DECLARE_EVENT_CLASS
 67#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 68	__BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))
 69
 70/*
 71 * This part is compiled out, it is only here as a build time check
 72 * to make sure that if the tracepoint handling changes, the
 73 * bpf probe will fail to compile unless it too is updated.
 74 */
 75#define __DEFINE_EVENT(template, call, proto, args, size)		\
 76static inline void bpf_test_probe_##call(void)				\
 77{									\
 78	check_trace_callback_type_##call(__bpf_trace_##template);	\
 79}									\
 80typedef void (*btf_trace_##call)(void *__data, proto);			\
 81static union {								\
 82	struct bpf_raw_event_map event;					\
 83	btf_trace_##call handler;					\
 84} __bpf_trace_tp_map_##call __used					\
 85__section("__bpf_raw_tp_map") = {					\
 86	.event = {							\
 87		.tp		= &__tracepoint_##call,			\
 88		.bpf_func	= __bpf_trace_##template,		\
 89		.num_args	= COUNT_ARGS(args),			\
 90		.writable_size	= size,					\
 91	},								\
 92};
 93
 94#define FIRST(x, ...) x
 95
 96#undef DEFINE_EVENT_WRITABLE
 97#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size)	\
 98static inline void bpf_test_buffer_##call(void)				\
 99{									\
100	/* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
101	 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not	\
102	 * dead-code-eliminated.					\
103	 */								\
104	FIRST(proto);							\
105	(void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args)));		\
106}									\
107__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
108
109#undef DEFINE_EVENT
110#define DEFINE_EVENT(template, call, proto, args)			\
111	__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
112
113#undef DEFINE_EVENT_PRINT
114#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
115	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
116
117#undef DECLARE_TRACE
118#define DECLARE_TRACE(call, proto, args)				\
119	__BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))		\
120	__DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0)
121
122#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
123
124#undef DEFINE_EVENT_WRITABLE
125#undef __DEFINE_EVENT
126#undef FIRST
127
128#endif /* CONFIG_BPF_EVENTS */