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

#undef TRACE_SYSTEM_VAR

#ifdef CONFIG_BPF_EVENTS

#include "stages/stage6_event_callback.h"

#undef __perf_count
#define __perf_count(c) (c)

#undef __perf_task
#define __perf_task(t)  (t)

#include <linux/args.h>

/* 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__)

#define __BPF_DECLARE_TRACE(call, proto, args)                          \
static notrace void                                                     \
__bpf_trace_##call(void *__data, proto)                                 \
{                                                                       \
        CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args));        \
}

#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
        __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))

#define __BPF_DECLARE_TRACE_SYSCALL(call, proto, args)                  \
static notrace void                                                     \
__bpf_trace_##call(void *__data, proto)                                 \
{                                                                       \
        might_fault();                                                  \
        preempt_disable_notrace();                                      \
        CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args));        \
        preempt_enable_notrace();                                       \
}

#undef DECLARE_EVENT_SYSCALL_CLASS
#define DECLARE_EVENT_SYSCALL_CLASS(call, proto, args, tstruct, assign, print)  \
        __BPF_DECLARE_TRACE_SYSCALL(call, PARAMS(proto), PARAMS(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.
 */
#define __DEFINE_EVENT(template, call, proto, args, size)               \
static inline void bpf_test_probe_##call(void)                          \
{                                                                       \
        check_trace_callback_type_##call(__bpf_trace_##template);       \
}                                                                       \
typedef void (*btf_trace_##call)(void *__data, proto);                  \
static union {                                                          \
        struct bpf_raw_event_map event;                                 \
        btf_trace_##call handler;                                       \
} __bpf_trace_tp_map_##call __used                                      \
__section("__bpf_raw_tp_map") = {                                       \
        .event = {                                                      \
                .tp             = &__tracepoint_##call,                 \
                .bpf_func       = __bpf_trace_##template,               \
                .num_args       = COUNT_ARGS(args),                     \
                .writable_size  = size,                                 \
        },                                                              \
};

#define FIRST(x, ...) x

#define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size)              \
static inline void bpf_test_buffer_##call(void)                         \
{                                                                       \
        /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
         * BUILD_BUG_ON_ZERO() uses a different mechanism that is not   \
         * dead-code-eliminated.                                        \
         */                                                             \
        FIRST(proto);                                                   \
        (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args)));          \
}

#undef DEFINE_EVENT_WRITABLE
#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \
        __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
        __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)

#undef DEFINE_EVENT
#define DEFINE_EVENT(template, call, proto, args)                       \
        __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)

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

#undef DECLARE_TRACE
#define DECLARE_TRACE(call, proto, args)                                \
        __BPF_DECLARE_TRACE(call##_tp, PARAMS(proto), PARAMS(args))             \
        __DEFINE_EVENT(call##_tp, call##_tp, PARAMS(proto), PARAMS(args), 0)

#undef DECLARE_TRACE_WRITABLE
#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \
        __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \
        __BPF_DECLARE_TRACE(call##_tp, PARAMS(proto), PARAMS(args)) \
        __DEFINE_EVENT(call##_tp, call##_tp, PARAMS(proto), PARAMS(args), size)

#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

#undef DECLARE_TRACE_WRITABLE
#undef DEFINE_EVENT_WRITABLE
#undef __CHECK_WRITABLE_BUF_SIZE
#undef __DEFINE_EVENT
#undef FIRST

#endif /* CONFIG_BPF_EVENTS */