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 #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) \ 46 static notrace void \ 47 __bpf_trace_##call(void *__data, proto) \ 48 { \ 49 struct bpf_prog *prog = __data; \ 50 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 51 } 52 53 #undef DECLARE_EVENT_CLASS 54 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 55 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 56 57 /* 58 * This part is compiled out, it is only here as a build time check 59 * to make sure that if the tracepoint handling changes, the 60 * bpf probe will fail to compile unless it too is updated. 61 */ 62 #define __DEFINE_EVENT(template, call, proto, args, size) \ 63 static inline void bpf_test_probe_##call(void) \ 64 { \ 65 check_trace_callback_type_##call(__bpf_trace_##template); \ 66 } \ 67 typedef void (*btf_trace_##call)(void *__data, proto); \ 68 static union { \ 69 struct bpf_raw_event_map event; \ 70 btf_trace_##call handler; \ 71 } __bpf_trace_tp_map_##call __used \ 72 __section("__bpf_raw_tp_map") = { \ 73 .event = { \ 74 .tp = &__tracepoint_##call, \ 75 .bpf_func = __bpf_trace_##template, \ 76 .num_args = COUNT_ARGS(args), \ 77 .writable_size = size, \ 78 }, \ 79 }; 80 81 #define FIRST(x, ...) x 82 83 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 84 static inline void bpf_test_buffer_##call(void) \ 85 { \ 86 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 87 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 88 * dead-code-eliminated. \ 89 */ \ 90 FIRST(proto); \ 91 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 92 } 93 94 #undef DEFINE_EVENT_WRITABLE 95 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 96 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 97 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 98 99 #undef DEFINE_EVENT 100 #define DEFINE_EVENT(template, call, proto, args) \ 101 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 102 103 #undef DEFINE_EVENT_PRINT 104 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 105 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 106 107 #undef DECLARE_TRACE 108 #define DECLARE_TRACE(call, proto, args) \ 109 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 110 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 111 112 #undef DECLARE_TRACE_WRITABLE 113 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 114 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 115 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 116 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 117 118 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 119 120 #undef DECLARE_TRACE_WRITABLE 121 #undef DEFINE_EVENT_WRITABLE 122 #undef __CHECK_WRITABLE_BUF_SIZE 123 #undef __DEFINE_EVENT 124 #undef FIRST 125 126 #endif /* CONFIG_BPF_EVENTS */ 127