Release 4.17 include/trace/bpf_probe.h

/* SPDX-License-Identifier: GPL-2.0 */

#undef TRACE_SYSTEM_VAR

#ifdef CONFIG_BPF_EVENTS

#undef __entry

#define __entry entry

#undef __get_dynamic_array

#define __get_dynamic_array(field)	\
		((void *)__entry + (__entry->__data_loc_##field & 0xffff))

#undef __get_dynamic_array_len

#define __get_dynamic_array_len(field)	\
		((__entry->__data_loc_##field >> 16) & 0xffff)

#undef __get_str

#define __get_str(field) ((char *)__get_dynamic_array(field))

#undef __get_bitmask

#define __get_bitmask(field) (char *)__get_dynamic_array(field)

#undef __perf_count

#define __perf_count(c)	(c)

#undef __perf_task

#define __perf_task(t)	(t)

/* cast any integer, pointer, or small struct to u64 */

#define UINTTYPE(size) \
	__typeof__(__builtin_choose_expr(size == 1,  (u8)1, \
                   __builtin_choose_expr(size == 2, (u16)2, \
                   __builtin_choose_expr(size == 4, (u32)3, \
                   __builtin_choose_expr(size == 8, (u64)4, \
                                         (void)5)))))

#define __CAST_TO_U64(x) ({ \
        typeof(x) __src = (x); \
        UINTTYPE(sizeof(x)) __dst; \
        memcpy(&__dst, &__src, sizeof(__dst)); \
        (u64)__dst; })


#define __CAST1(a,...) __CAST_TO_U64(a)

#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)

#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)

#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)

#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)

#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)

#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)

#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)

#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)

#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)

#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)

#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
/* tracepoints with more than 12 arguments will hit build error */

#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)

#undef DECLARE_EVENT_CLASS

#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
static notrace void                                                     \
__bpf_trace_##call(void *__data, proto)                                 \
{                                                                       \
        struct bpf_prog *prog = __data;                                 \
        CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args));  \
}

/*
 * This part is compiled out, it is only here as a build time check
 * to make sure that if the tracepoint handling changes, the
 * bpf probe will fail to compile unless it too is updated.
 */
#undef DEFINE_EVENT

#define DEFINE_EVENT(template, call, proto, args)			\
static inline void bpf_test_probe_##call(void)                          \
{                                                                       \
        check_trace_callback_type_##call(__bpf_trace_##template);       \
}                                                                       \
static struct bpf_raw_event_map __used                                  \
        __attribute__((section("__bpf_raw_tp_map")))                    \
__bpf_trace_tp_map_##call = {                                           \
        .tp             = &__tracepoint_##call,                         \
        .bpf_func       = (void *)__bpf_trace_##template,               \
        .num_args       = COUNT_ARGS(args),                             \
};


#undef DEFINE_EVENT_PRINT

#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))

#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
#endif /* CONFIG_BPF_EVENTS */
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Directory: include/trace

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