126 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2 3#undef TRACE_SYSTEM_VAR4 5#ifdef CONFIG_BPF_EVENTS6 7#include "stages/stage6_event_callback.h"8 9#undef __perf_count10#define __perf_count(c) (c)11 12#undef __perf_task13#define __perf_task(t) (t)14 15#include <linux/args.h>16 17/* cast any integer, pointer, or small struct to u64 */18#define UINTTYPE(size) \19 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \20 __builtin_choose_expr(size == 2, (u16)2, \21 __builtin_choose_expr(size == 4, (u32)3, \22 __builtin_choose_expr(size == 8, (u64)4, \23 (void)5)))))24#define __CAST_TO_U64(x) ({ \25 typeof(x) __src = (x); \26 UINTTYPE(sizeof(x)) __dst; \27 memcpy(&__dst, &__src, sizeof(__dst)); \28 (u64)__dst; })29 30#define __CAST1(a,...) __CAST_TO_U64(a)31#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)32#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)33#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)34#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)35#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)36#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)37#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)38#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)39#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)40#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)41#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)42/* tracepoints with more than 12 arguments will hit build error */43#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)44 45#define __BPF_DECLARE_TRACE(call, proto, args) \46static notrace void \47__bpf_trace_##call(void *__data, proto) \48{ \49 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args)); \50}51 52#undef DECLARE_EVENT_CLASS53#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \54 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args))55 56/*57 * This part is compiled out, it is only here as a build time check58 * to make sure that if the tracepoint handling changes, the59 * bpf probe will fail to compile unless it too is updated.60 */61#define __DEFINE_EVENT(template, call, proto, args, size) \62static inline void bpf_test_probe_##call(void) \63{ \64 check_trace_callback_type_##call(__bpf_trace_##template); \65} \66typedef void (*btf_trace_##call)(void *__data, proto); \67static union { \68 struct bpf_raw_event_map event; \69 btf_trace_##call handler; \70} __bpf_trace_tp_map_##call __used \71__section("__bpf_raw_tp_map") = { \72 .event = { \73 .tp = &__tracepoint_##call, \74 .bpf_func = __bpf_trace_##template, \75 .num_args = COUNT_ARGS(args), \76 .writable_size = size, \77 }, \78};79 80#define FIRST(x, ...) x81 82#define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \83static inline void bpf_test_buffer_##call(void) \84{ \85 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \86 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \87 * dead-code-eliminated. \88 */ \89 FIRST(proto); \90 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \91}92 93#undef DEFINE_EVENT_WRITABLE94#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \95 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \96 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)97 98#undef DEFINE_EVENT99#define DEFINE_EVENT(template, call, proto, args) \100 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)101 102#undef DEFINE_EVENT_PRINT103#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \104 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))105 106#undef DECLARE_TRACE107#define DECLARE_TRACE(call, proto, args) \108 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \109 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0)110 111#undef DECLARE_TRACE_WRITABLE112#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \113 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \114 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \115 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size)116 117#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)118 119#undef DECLARE_TRACE_WRITABLE120#undef DEFINE_EVENT_WRITABLE121#undef __CHECK_WRITABLE_BUF_SIZE122#undef __DEFINE_EVENT123#undef FIRST124 125#endif /* CONFIG_BPF_EVENTS */126