Eric Lee / smarc-fsl-linux-kernel

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include/trace/bpf_probe.h 3.94 KB
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c4f6699df   Alexei Starovoitov   bpf: introduce BP... 
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  /* SPDX-License-Identifier: GPL-2.0 */
  
  #undef TRACE_SYSTEM_VAR
  
  #ifdef CONFIG_BPF_EVENTS
  
  #undef __entry
  #define __entry entry
  
  #undef __get_dynamic_array
  #define __get_dynamic_array(field)	\
  		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
  
  #undef __get_dynamic_array_len
  #define __get_dynamic_array_len(field)	\
  		((__entry->__data_loc_##field >> 16) & 0xffff)
  
  #undef __get_str
  #define __get_str(field) ((char *)__get_dynamic_array(field))
  
  #undef __get_bitmask
  #define __get_bitmask(field) (char *)__get_dynamic_array(field)
  
  #undef __perf_count
  #define __perf_count(c)	(c)
  
  #undef __perf_task
  #define __perf_task(t)	(t)
  
  /* cast any integer, pointer, or small struct to u64 */
  #define UINTTYPE(size) \
  	__typeof__(__builtin_choose_expr(size == 1,  (u8)1, \
  		   __builtin_choose_expr(size == 2, (u16)2, \
  		   __builtin_choose_expr(size == 4, (u32)3, \
  		   __builtin_choose_expr(size == 8, (u64)4, \
  					 (void)5)))))
  #define __CAST_TO_U64(x) ({ \
  	typeof(x) __src = (x); \
  	UINTTYPE(sizeof(x)) __dst; \
  	memcpy(&__dst, &__src, sizeof(__dst)); \
  	(u64)__dst; })
  
  #define __CAST1(a,...) __CAST_TO_U64(a)
  #define __CAST2(a,...) __CAST_TO_U64(a), __CAST1(__VA_ARGS__)
  #define __CAST3(a,...) __CAST_TO_U64(a), __CAST2(__VA_ARGS__)
  #define __CAST4(a,...) __CAST_TO_U64(a), __CAST3(__VA_ARGS__)
  #define __CAST5(a,...) __CAST_TO_U64(a), __CAST4(__VA_ARGS__)
  #define __CAST6(a,...) __CAST_TO_U64(a), __CAST5(__VA_ARGS__)
  #define __CAST7(a,...) __CAST_TO_U64(a), __CAST6(__VA_ARGS__)
  #define __CAST8(a,...) __CAST_TO_U64(a), __CAST7(__VA_ARGS__)
  #define __CAST9(a,...) __CAST_TO_U64(a), __CAST8(__VA_ARGS__)
  #define __CAST10(a,...) __CAST_TO_U64(a), __CAST9(__VA_ARGS__)
  #define __CAST11(a,...) __CAST_TO_U64(a), __CAST10(__VA_ARGS__)
  #define __CAST12(a,...) __CAST_TO_U64(a), __CAST11(__VA_ARGS__)
  /* tracepoints with more than 12 arguments will hit build error */
  #define CAST_TO_U64(...) CONCATENATE(__CAST, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)
  
  #undef DECLARE_EVENT_CLASS
  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
  static notrace void							\
  __bpf_trace_##call(void *__data, proto)					\
  {									\
  	struct bpf_prog *prog = __data;					\
  	CONCATENATE(bpf_trace_run, COUNT_ARGS(args))(prog, CAST_TO_U64(args));	\
  }
  
  /*
   * This part is compiled out, it is only here as a build time check
   * to make sure that if the tracepoint handling changes, the
   * bpf probe will fail to compile unless it too is updated.
   */
9df1c28bb   Matt Mullins   bpf: add writable... 
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  #define __DEFINE_EVENT(template, call, proto, args, size)		\
c4f6699df   Alexei Starovoitov   bpf: introduce BP... 
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  static inline void bpf_test_probe_##call(void)				\
  {									\
  	check_trace_callback_type_##call(__bpf_trace_##template);	\
  }									\
e8c423fb3   Alexei Starovoitov   bpf: Add typecast... 
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  typedef void (*btf_trace_##call)(void *__data, proto);			\
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  static union {								\
  	struct bpf_raw_event_map event;					\
  	btf_trace_##call handler;					\
  } __bpf_trace_tp_map_##call __used					\
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  __section("__bpf_raw_tp_map") = {					\
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  	.event = {							\
  		.tp		= &__tracepoint_##call,			\
  		.bpf_func	= __bpf_trace_##template,		\
  		.num_args	= COUNT_ARGS(args),			\
  		.writable_size	= size,					\
  	},								\
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  };
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  #define FIRST(x, ...) x
  
  #undef DEFINE_EVENT_WRITABLE
  #define DEFINE_EVENT_WRITABLE(template, call, proto, args, size)	\
  static inline void bpf_test_buffer_##call(void)				\
  {									\
  	/* BUILD_BUG_ON() is ignored if the code is completely eliminated, but \
  	 * BUILD_BUG_ON_ZERO() uses a different mechanism that is not	\
  	 * dead-code-eliminated.					\
  	 */								\
  	FIRST(proto);							\
  	(void)BUILD_BUG_ON_ZERO(size != sizeof(*FIRST(args)));		\
  }									\
  __DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), size)
  
  #undef DEFINE_EVENT
  #define DEFINE_EVENT(template, call, proto, args)			\
  	__DEFINE_EVENT(template, call, PARAMS(proto), PARAMS(args), 0)
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  #undef DEFINE_EVENT_PRINT
  #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
  	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  
  #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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  #undef DEFINE_EVENT_WRITABLE
  #undef __DEFINE_EVENT
  #undef FIRST
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  #endif /* CONFIG_BPF_EVENTS */