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_cpumask 25 #define __get_cpumask(field) (char *)__get_dynamic_array(field) 26 27 #undef __get_sockaddr 28 #define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field)) 29 30 #undef __get_rel_dynamic_array 31 #define __get_rel_dynamic_array(field) \ 32 ((void *)(&__entry->__rel_loc_##field) + \ 33 sizeof(__entry->__rel_loc_##field) + \ 34 (__entry->__rel_loc_##field & 0xffff)) 35 36 #undef __get_rel_dynamic_array_len 37 #define __get_rel_dynamic_array_len(field) \ 38 ((__entry->__rel_loc_##field >> 16) & 0xffff) 39 40 #undef __get_rel_str 41 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field)) 42 43 #undef __get_rel_bitmask 44 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field) 45 46 #undef __get_rel_cpumask 47 #define __get_rel_cpumask(field) (char *)__get_rel_dynamic_array(field) 48 49 #undef __get_rel_sockaddr 50 #define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field)) 51 52 #undef __perf_count 53 #define __perf_count(c) (c) 54 55 #undef __perf_task 56 #define __perf_task(t) (t) 57 58 /* cast any integer, pointer, or small struct to u64 */ 59 #define UINTTYPE(size) \ 60 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \ 61 __builtin_choose_expr(size == 2, (u16)2, \ 62 __builtin_choose_expr(size == 4, (u32)3, \ 63 __builtin_choose_expr(size == 8, (u64)4, \ 64 (void)5))))) 65 #define __CAST_TO_U64(x) ({ \ 66 typeof(x) __src = (x); \ 67 UINTTYPE(sizeof(x)) __dst; \ 68 memcpy(&__dst, &__src, sizeof(__dst)); \ 69 (u64)__dst; }) 70 71 #define __CAST1(a,...) __CAST_TO_U64(a) 72 #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) 73 #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) 74 #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) 75 #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) 76 #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) 77 #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) 78 #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) 79 #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) 80 #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) 81 #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) 82 #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) 83 /* tracepoints with more than 12 arguments will hit build error */ 84 #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) 85 86 #define __BPF_DECLARE_TRACE(call, proto, args) \ 87 static notrace void \ 88 __bpf_trace_##call(void *__data, proto) \ 89 { \ 90 struct bpf_prog *prog = __data; \ 91 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 92 } 93 94 #undef DECLARE_EVENT_CLASS 95 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 96 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 97 98 /* 99 * This part is compiled out, it is only here as a build time check 100 * to make sure that if the tracepoint handling changes, the 101 * bpf probe will fail to compile unless it too is updated. 102 */ 103 #define __DEFINE_EVENT(template, call, proto, args, size) \ 104 static inline void bpf_test_probe_##call(void) \ 105 { \ 106 check_trace_callback_type_##call(__bpf_trace_##template); \ 107 } \ 108 typedef void (*btf_trace_##call)(void *__data, proto); \ 109 static union { \ 110 struct bpf_raw_event_map event; \ 111 btf_trace_##call handler; \ 112 } __bpf_trace_tp_map_##call __used \ 113 __section("__bpf_raw_tp_map") = { \ 114 .event = { \ 115 .tp = &__tracepoint_##call, \ 116 .bpf_func = __bpf_trace_##template, \ 117 .num_args = COUNT_ARGS(args), \ 118 .writable_size = size, \ 119 }, \ 120 }; 121 122 #define FIRST(x, ...) x 123 124 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 125 static inline void bpf_test_buffer_##call(void) \ 126 { \ 127 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 128 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 129 * dead-code-eliminated. \ 130 */ \ 131 FIRST(proto); \ 132 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 133 } 134 135 #undef DEFINE_EVENT_WRITABLE 136 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 137 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 138 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 139 140 #undef DEFINE_EVENT 141 #define DEFINE_EVENT(template, call, proto, args) \ 142 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 143 144 #undef DEFINE_EVENT_PRINT 145 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 146 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 147 148 #undef DECLARE_TRACE 149 #define DECLARE_TRACE(call, proto, args) \ 150 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 151 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 152 153 #undef DECLARE_TRACE_WRITABLE 154 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 155 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 156 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 157 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 158 159 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 160 161 #undef DECLARE_TRACE_WRITABLE 162 #undef DEFINE_EVENT_WRITABLE 163 #undef __CHECK_WRITABLE_BUF_SIZE 164 #undef __DEFINE_EVENT 165 #undef FIRST 166 167 #endif /* CONFIG_BPF_EVENTS */ 168