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 __get_rel_dynamic_array 25 #define __get_rel_dynamic_array(field) \ 26 ((void *)(&__entry->__rel_loc_##field) + \ 27 sizeof(__entry->__rel_loc_##field) + \ 28 (__entry->__rel_loc_##field & 0xffff)) 29 30 #undef __get_rel_dynamic_array_len 31 #define __get_rel_dynamic_array_len(field) \ 32 ((__entry->__rel_loc_##field >> 16) & 0xffff) 33 34 #undef __get_rel_str 35 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field)) 36 37 #undef __get_rel_bitmask 38 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field) 39 40 #undef __perf_count 41 #define __perf_count(c) (c) 42 43 #undef __perf_task 44 #define __perf_task(t) (t) 45 46 /* cast any integer, pointer, or small struct to u64 */ 47 #define UINTTYPE(size) \ 48 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \ 49 __builtin_choose_expr(size == 2, (u16)2, \ 50 __builtin_choose_expr(size == 4, (u32)3, \ 51 __builtin_choose_expr(size == 8, (u64)4, \ 52 (void)5))))) 53 #define __CAST_TO_U64(x) ({ \ 54 typeof(x) __src = (x); \ 55 UINTTYPE(sizeof(x)) __dst; \ 56 memcpy(&__dst, &__src, sizeof(__dst)); \ 57 (u64)__dst; }) 58 59 #define __CAST1(a,...) __CAST_TO_U64(a) 60 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) 61 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) 62 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) 63 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) 64 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) 65 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) 66 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) 67 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) 68 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) 69 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) 70 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) 71 /* tracepoints with more than 12 arguments will hit build error */ 72 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) 73 74 #define __BPF_DECLARE_TRACE(call, proto, args) \ 75 static notrace void \ 76 __bpf_trace_##call(void *__data, proto) \ 77 { \ 78 struct bpf_prog *prog = __data; \ 79 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 80 } 81 82 #undef DECLARE_EVENT_CLASS 83 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 84 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 85 86 /* 87 * This part is compiled out, it is only here as a build time check 88 * to make sure that if the tracepoint handling changes, the 89 * bpf probe will fail to compile unless it too is updated. 90 */ 91 #define __DEFINE_EVENT(template, call, proto, args, size) \ 92 static inline void bpf_test_probe_##call(void) \ 93 { \ 94 check_trace_callback_type_##call(__bpf_trace_##template); \ 95 } \ 96 typedef void (*btf_trace_##call)(void *__data, proto); \ 97 static union { \ 98 struct bpf_raw_event_map event; \ 99 btf_trace_##call handler; \ 100 } __bpf_trace_tp_map_##call __used \ 101 __section("__bpf_raw_tp_map") = { \ 102 .event = { \ 103 .tp = &__tracepoint_##call, \ 104 .bpf_func = __bpf_trace_##template, \ 105 .num_args = COUNT_ARGS(args), \ 106 .writable_size = size, \ 107 }, \ 108 }; 109 110 #define FIRST(x, ...) x 111 112 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 113 static inline void bpf_test_buffer_##call(void) \ 114 { \ 115 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 116 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 117 * dead-code-eliminated. \ 118 */ \ 119 FIRST(proto); \ 120 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 121 } 122 123 #undef DEFINE_EVENT_WRITABLE 124 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 125 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 126 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 127 128 #undef DEFINE_EVENT 129 #define DEFINE_EVENT(template, call, proto, args) \ 130 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 131 132 #undef DEFINE_EVENT_PRINT 133 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 134 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 135 136 #undef DECLARE_TRACE 137 #define DECLARE_TRACE(call, proto, args) \ 138 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 139 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 140 141 #undef DECLARE_TRACE_WRITABLE 142 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 143 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 144 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 145 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 146 147 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 148 149 #undef DECLARE_TRACE_WRITABLE 150 #undef DEFINE_EVENT_WRITABLE 151 #undef __CHECK_WRITABLE_BUF_SIZE 152 #undef __DEFINE_EVENT 153 #undef FIRST 154 155 #endif /* CONFIG_BPF_EVENTS */ 156