bpf_probe.h (5534B)
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_sockaddr 25#define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field)) 26 27#undef __get_rel_dynamic_array 28#define __get_rel_dynamic_array(field) \ 29 ((void *)(&__entry->__rel_loc_##field) + \ 30 sizeof(__entry->__rel_loc_##field) + \ 31 (__entry->__rel_loc_##field & 0xffff)) 32 33#undef __get_rel_dynamic_array_len 34#define __get_rel_dynamic_array_len(field) \ 35 ((__entry->__rel_loc_##field >> 16) & 0xffff) 36 37#undef __get_rel_str 38#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field)) 39 40#undef __get_rel_bitmask 41#define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field) 42 43#undef __get_rel_sockaddr 44#define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field)) 45 46#undef __perf_count 47#define __perf_count(c) (c) 48 49#undef __perf_task 50#define __perf_task(t) (t) 51 52/* cast any integer, pointer, or small struct to u64 */ 53#define UINTTYPE(size) \ 54 __typeof__(__builtin_choose_expr(size == 1, (u8)1, \ 55 __builtin_choose_expr(size == 2, (u16)2, \ 56 __builtin_choose_expr(size == 4, (u32)3, \ 57 __builtin_choose_expr(size == 8, (u64)4, \ 58 (void)5))))) 59#define __CAST_TO_U64(x) ({ \ 60 typeof(x) __src = (x); \ 61 UINTTYPE(sizeof(x)) __dst; \ 62 memcpy(&__dst, &__src, sizeof(__dst)); \ 63 (u64)__dst; }) 64 65#define __CAST1(a,...) __CAST_TO_U64(a) 66#define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__) 67#define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__) 68#define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__) 69#define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__) 70#define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__) 71#define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__) 72#define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__) 73#define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__) 74#define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__) 75#define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__) 76#define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__) 77/* tracepoints with more than 12 arguments will hit build error */ 78#define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__) 79 80#define __BPF_DECLARE_TRACE(call, proto, args) \ 81static notrace void \ 82__bpf_trace_##call(void *__data, proto) \ 83{ \ 84 struct bpf_prog *prog = __data; \ 85 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args)); \ 86} 87 88#undef DECLARE_EVENT_CLASS 89#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 90 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 91 92/* 93 * This part is compiled out, it is only here as a build time check 94 * to make sure that if the tracepoint handling changes, the 95 * bpf probe will fail to compile unless it too is updated. 96 */ 97#define __DEFINE_EVENT(template, call, proto, args, size) \ 98static inline void bpf_test_probe_##call(void) \ 99{ \ 100 check_trace_callback_type_##call(__bpf_trace_##template); \ 101} \ 102typedef void (*btf_trace_##call)(void *__data, proto); \ 103static union { \ 104 struct bpf_raw_event_map event; \ 105 btf_trace_##call handler; \ 106} __bpf_trace_tp_map_##call __used \ 107__section("__bpf_raw_tp_map") = { \ 108 .event = { \ 109 .tp = &__tracepoint_##call, \ 110 .bpf_func = __bpf_trace_##template, \ 111 .num_args = COUNT_ARGS(args), \ 112 .writable_size = size, \ 113 }, \ 114}; 115 116#define FIRST(x, ...) x 117 118#define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 119static inline void bpf_test_buffer_##call(void) \ 120{ \ 121 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 122 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 123 * dead-code-eliminated. \ 124 */ \ 125 FIRST(proto); \ 126 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 127} 128 129#undef DEFINE_EVENT_WRITABLE 130#define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 131 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 132 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 133 134#undef DEFINE_EVENT 135#define DEFINE_EVENT(template, call, proto, args) \ 136 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 137 138#undef DEFINE_EVENT_PRINT 139#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 140 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 141 142#undef DECLARE_TRACE 143#define DECLARE_TRACE(call, proto, args) \ 144 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 145 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 146 147#undef DECLARE_TRACE_WRITABLE 148#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 149 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 150 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 151 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 152 153#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 154 155#undef DECLARE_TRACE_WRITABLE 156#undef DEFINE_EVENT_WRITABLE 157#undef __CHECK_WRITABLE_BUF_SIZE 158#undef __DEFINE_EVENT 159#undef FIRST 160 161#endif /* CONFIG_BPF_EVENTS */