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 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args)); \ 50 } 51 52 #undef DECLARE_EVENT_CLASS 53 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 54 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) 55 56 #define __BPF_DECLARE_TRACE_SYSCALL(call, proto, args) \ 57 static notrace void \ 58 __bpf_trace_##call(void *__data, proto) \ 59 { \ 60 might_fault(); \ 61 preempt_disable_notrace(); \ 62 CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(__data, CAST_TO_U64(args)); \ 63 preempt_enable_notrace(); \ 64 } 65 66 #undef DECLARE_EVENT_SYSCALL_CLASS 67 #define DECLARE_EVENT_SYSCALL_CLASS(call, proto, args, tstruct, assign, print) \ 68 __BPF_DECLARE_TRACE_SYSCALL(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 #define __CHECK_WRITABLE_BUF_SIZE(call, proto, args, size) \ 97 static inline void bpf_test_buffer_##call(void) \ 98 { \ 99 /* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \ 100 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not \ 101 * dead-code-eliminated. \ 102 */ \ 103 FIRST(proto); \ 104 (void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args))); \ 105 } 106 107 #undef DEFINE_EVENT_WRITABLE 108 #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size) \ 109 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 110 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size) 111 112 #undef DEFINE_EVENT 113 #define DEFINE_EVENT(template, call, proto, args) \ 114 __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0) 115 116 #undef DEFINE_EVENT_PRINT 117 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 118 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 119 120 #undef DECLARE_TRACE 121 #define DECLARE_TRACE(call, proto, args) \ 122 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 123 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), 0) 124 125 #undef DECLARE_TRACE_WRITABLE 126 #define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ 127 __CHECK_WRITABLE_BUF_SIZE(call, PARAMS(proto), PARAMS(args), size) \ 128 __BPF_DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) \ 129 __DEFINE_EVENT(call, call, PARAMS(proto), PARAMS(args), size) 130 131 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 132 133 #undef DECLARE_TRACE_WRITABLE 134 #undef DEFINE_EVENT_WRITABLE 135 #undef __CHECK_WRITABLE_BUF_SIZE 136 #undef __DEFINE_EVENT 137 #undef FIRST 138 139 #endif /* CONFIG_BPF_EVENTS */ 140