1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #undef TRACE_SYSTEM_VAR 4 5 #ifdef CONFIG_BPF_EVENTS 6 7 #include "stages/stage6_event_callback.h" 8 9 #undef __perf_count 10 #define __perf_count(c) (c) 11 12 #undef __perf_task 13 #define __perf_task(t) (t) 14 15 /* cast any integer, pointer, or small struct to u64 */ 16 #define UINTTYPE(size) \ 17 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \ 18 __builtin_choose_expr(size == 2, (u16)2, \ 19 __builtin_choose_expr(size == 4, (u32)3, \ 20 __builtin_choose_expr(size == 8, (u64)4, \ 21 (void)5))))) 22 #define __CAST_TO_U64(x) ({ \ 23 typeof(x) __src = (x); \ 24 UINTTYPE(sizeof(x)) __dst; \ 25 memcpy(&__dst, &__src, sizeof(__dst)); \ 26 (u64)__dst; }) 27 28 #define __CAST1(a,...) __CAST_TO_U64(a) 29 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) 30 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) 31 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) 32 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) 33 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) 34 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) 35 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) 36 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) 37 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) 38 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) 39 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) 40 /* tracepoints with more than 12 arguments will hit build error */ 41 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) 42 43 #define __BPF_DECLARE_TRACE(call, proto, args) \ 44 static notrace void \ 45 __bpf_trace_##call(void *__data, proto) \ 46 { \ 47 struct bpf_prog *prog = __data; \ 48 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 49 } 50 51 #undef DECLARE_EVENT_CLASS 52 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 53 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 54 55 /* 56 * This part is compiled out, it is only here as a build time check 57 * to make sure that if the tracepoint handling changes, the 58 * bpf probe will fail to compile unless it too is updated. 59 */ 60 #define __DEFINE_EVENT(template, call, proto, args, size) \ 61 static inline void bpf_test_probe_##call(void) \ 62 { \ 63 check_trace_callback_type_##call(__bpf_trace_##template); \ 64 } \ 65 typedef void (*btf_trace_##call)(void *__data, proto); \ 66 static union { \ 67 struct bpf_raw_event_map event; \ 68 btf_trace_##call handler; \ 69 } __bpf_trace_tp_map_##call __used \ 70 __section("__bpf_raw_tp_map") = { \ 71 .event = { \ 72 .tp = &__tracepoint_##call, \ 73 .bpf_func = __bpf_trace_##template, \ 74 .num_args = COUNT_ARGS(args), \ 75 .writable_size = size, \ 76 }, \ 77 }; 78 79 #define FIRST(x, ...) x 80 81 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 82 static inline void bpf_test_buffer_##call(void) \ 83 { \ 84 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 85 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 86 * dead-code-eliminated. \ 87 */ \ 88 FIRST(proto); \ 89 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 90 } 91 92 #undef DEFINE_EVENT_WRITABLE 93 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 94 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 95 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 96 97 #undef DEFINE_EVENT 98 #define DEFINE_EVENT(template, call, proto, args) \ 99 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 100 101 #undef DEFINE_EVENT_PRINT 102 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 103 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 104 105 #undef DECLARE_TRACE 106 #define DECLARE_TRACE(call, proto, args) \ 107 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 108 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 109 110 #undef DECLARE_TRACE_WRITABLE 111 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 112 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 113 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 114 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 115 116 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 117 118 #undef DECLARE_TRACE_WRITABLE 119 #undef DEFINE_EVENT_WRITABLE 120 #undef __CHECK_WRITABLE_BUF_SIZE 121 #undef __DEFINE_EVENT 122 #undef FIRST 123 124 #endif /* CONFIG_BPF_EVENTS */ 125