1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #undef TRACE_SYSTEM_VAR 4 5 #ifdef CONFIG_BPF_EVENTS 6 7 #undef __entry 8 #define __entry entry 9 10 #undef __get_dynamic_array 11 #define __get_dynamic_array(field) \ 12 ((void *)__entry + (__entry->__data_loc_##field & 0xffff)) 13 14 #undef __get_dynamic_array_len 15 #define __get_dynamic_array_len(field) \ 16 ((__entry->__data_loc_##field >> 16) & 0xffff) 17 18 #undef __get_str 19 #define __get_str(field) ((char *)__get_dynamic_array(field)) 20 21 #undef __get_bitmask 22 #define __get_bitmask(field) (char *)__get_dynamic_array(field) 23 24 #undef __perf_count 25 #define __perf_count(c) (c) 26 27 #undef __perf_task 28 #define __perf_task(t) (t) 29 30 /* cast any integer, pointer, or small struct to u64 */ 31 #define UINTTYPE(size) \ 32 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \ 33 __builtin_choose_expr(size == 2, (u16)2, \ 34 __builtin_choose_expr(size == 4, (u32)3, \ 35 __builtin_choose_expr(size == 8, (u64)4, \ 36 (void)5))))) 37 #define __CAST_TO_U64(x) ({ \ 38 typeof(x) __src = (x); \ 39 UINTTYPE(sizeof(x)) __dst; \ 40 memcpy(&__dst, &__src, sizeof(__dst)); \ 41 (u64)__dst; }) 42 43 #define __CAST1(a,...) __CAST_TO_U64(a) 44 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) 45 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) 46 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) 47 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) 48 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) 49 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) 50 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) 51 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) 52 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) 53 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) 54 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) 55 /* tracepoints with more than 12 arguments will hit build error */ 56 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) 57 58 #define __BPF_DECLARE_TRACE(call, proto, args) \ 59 static notrace void \ 60 __bpf_trace_##call(void *__data, proto) \ 61 { \ 62 struct bpf_prog *prog = __data; \ 63 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 64 } 65 66 #undef DECLARE_EVENT_CLASS 67 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 68 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 69 70 /* 71 * This part is compiled out, it is only here as a build time check 72 * to make sure that if the tracepoint handling changes, the 73 * bpf probe will fail to compile unless it too is updated. 74 */ 75 #define __DEFINE_EVENT(template, call, proto, args, size) \ 76 static inline void bpf_test_probe_##call(void) \ 77 { \ 78 check_trace_callback_type_##call(__bpf_trace_##template); \ 79 } \ 80 typedef void (*btf_trace_##call)(void *__data, proto); \ 81 static union { \ 82 struct bpf_raw_event_map event; \ 83 btf_trace_##call handler; \ 84 } __bpf_trace_tp_map_##call __used \ 85 __section("__bpf_raw_tp_map") = { \ 86 .event = { \ 87 .tp = &__tracepoint_##call, \ 88 .bpf_func = __bpf_trace_##template, \ 89 .num_args = COUNT_ARGS(args), \ 90 .writable_size = size, \ 91 }, \ 92 }; 93 94 #define FIRST(x, ...) x 95 96 #undef DEFINE_EVENT_WRITABLE 97 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 98 static inline void bpf_test_buffer_##call(void) \ 99 { \ 100 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 101 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 102 * dead-code-eliminated. \ 103 */ \ 104 FIRST(proto); \ 105 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 106 } \ 107 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 108 109 #undef DEFINE_EVENT 110 #define DEFINE_EVENT(template, call, proto, args) \ 111 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 112 113 #undef DEFINE_EVENT_PRINT 114 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 115 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 116 117 #undef DECLARE_TRACE 118 #define DECLARE_TRACE(call, proto, args) \ 119 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 120 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 121 122 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 123 124 #undef DEFINE_EVENT_WRITABLE 125 #undef __DEFINE_EVENT 126 #undef FIRST 127 128 #endif /* CONFIG_BPF_EVENTS */ 129