xref: /linux/kernel/trace/trace_probe.h (revision 70a663205d5085f1d82f7058e9419ff7612e9396)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Common header file for probe-based Dynamic events.
4  *
5  * This code was copied from kernel/trace/trace_kprobe.h written by
6  * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
7  *
8  * Updates to make this generic:
9  * Copyright (C) IBM Corporation, 2010-2011
10  * Author:     Srikar Dronamraju
11  */
12 
13 #include <linux/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/smp.h>
16 #include <linux/tracefs.h>
17 #include <linux/types.h>
18 #include <linux/string.h>
19 #include <linux/ptrace.h>
20 #include <linux/perf_event.h>
21 #include <linux/kprobes.h>
22 #include <linux/stringify.h>
23 #include <linux/limits.h>
24 #include <linux/uaccess.h>
25 #include <linux/bitops.h>
26 #include <linux/btf.h>
27 #include <asm/bitsperlong.h>
28 
29 #include "trace.h"
30 #include "trace_output.h"
31 
32 #define MAX_TRACE_ARGS		128
33 #define MAX_ARGSTR_LEN		63
34 #define MAX_ARRAY_LEN		64
35 #define MAX_ARG_NAME_LEN	32
36 #define MAX_BTF_ARGS_LEN	128
37 #define MAX_DENTRY_ARGS_LEN	256
38 #define MAX_STRING_SIZE		PATH_MAX
39 #define MAX_ARG_BUF_LEN		(MAX_TRACE_ARGS * MAX_ARG_NAME_LEN)
40 
41 /* Reserved field names */
42 #define FIELD_STRING_IP		"__probe_ip"
43 #define FIELD_STRING_RETIP	"__probe_ret_ip"
44 #define FIELD_STRING_FUNC	"__probe_func"
45 
46 #undef DEFINE_FIELD
47 #define DEFINE_FIELD(type, item, name, is_signed)			\
48 	do {								\
49 		ret = trace_define_field(event_call, #type, name,	\
50 					 offsetof(typeof(field), item),	\
51 					 sizeof(field.item), is_signed, \
52 					 FILTER_OTHER);			\
53 		if (ret)						\
54 			return ret;					\
55 	} while (0)
56 
57 
58 /* Flags for trace_probe */
59 #define TP_FLAG_TRACE		1
60 #define TP_FLAG_PROFILE		2
61 
62 /* data_loc: data location, compatible with u32 */
63 #define make_data_loc(len, offs)	\
64 	(((u32)(len) << 16) | ((u32)(offs) & 0xffff))
65 #define get_loc_len(dl)		((u32)(dl) >> 16)
66 #define get_loc_offs(dl)	((u32)(dl) & 0xffff)
67 
get_loc_data(u32 * dl,void * ent)68 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
69 {
70 	return (u8 *)ent + get_loc_offs(*dl);
71 }
72 
update_data_loc(u32 loc,int consumed)73 static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
74 {
75 	u32 maxlen = get_loc_len(loc);
76 	u32 offset = get_loc_offs(loc);
77 
78 	return make_data_loc(maxlen - consumed, offset + consumed);
79 }
80 
81 /* Printing function type */
82 typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);
83 
84 enum fetch_op {
85 	FETCH_OP_NOP = 0,
86 	// Stage 1 (load) ops
87 	FETCH_OP_REG,		/* Register : .param = offset */
88 	FETCH_OP_STACK,		/* Stack : .param = index */
89 	FETCH_OP_STACKP,	/* Stack pointer */
90 	FETCH_OP_RETVAL,	/* Return value */
91 	FETCH_OP_IMM,		/* Immediate : .immediate */
92 	FETCH_OP_COMM,		/* Current comm */
93 	FETCH_OP_ARG,		/* Function argument : .param */
94 	FETCH_OP_FOFFS,		/* File offset: .immediate */
95 	FETCH_OP_DATA,		/* Allocated data: .data */
96 	FETCH_OP_EDATA,		/* Entry data: .offset */
97 	// Stage 2 (dereference) op
98 	FETCH_OP_DEREF,		/* Dereference: .offset */
99 	FETCH_OP_UDEREF,	/* User-space Dereference: .offset */
100 	// Stage 3 (store) ops
101 	FETCH_OP_ST_RAW,	/* Raw: .size */
102 	FETCH_OP_ST_MEM,	/* Mem: .offset, .size */
103 	FETCH_OP_ST_UMEM,	/* Mem: .offset, .size */
104 	FETCH_OP_ST_STRING,	/* String: .offset, .size */
105 	FETCH_OP_ST_USTRING,	/* User String: .offset, .size */
106 	FETCH_OP_ST_SYMSTR,	/* Kernel Symbol String: .offset, .size */
107 	FETCH_OP_ST_EDATA,	/* Store Entry Data: .offset */
108 	// Stage 4 (modify) op
109 	FETCH_OP_MOD_BF,	/* Bitfield: .basesize, .lshift, .rshift */
110 	// Stage 5 (loop) op
111 	FETCH_OP_LP_ARRAY,	/* Array: .param = loop count */
112 	FETCH_OP_TP_ARG,	/* Trace Point argument */
113 	FETCH_OP_END,
114 	FETCH_NOP_SYMBOL,	/* Unresolved Symbol holder */
115 };
116 
117 struct fetch_insn {
118 	enum fetch_op op;
119 	union {
120 		unsigned int param;
121 		struct {
122 			unsigned int size;
123 			int offset;
124 		};
125 		struct {
126 			unsigned char basesize;
127 			unsigned char lshift;
128 			unsigned char rshift;
129 		};
130 		unsigned long immediate;
131 		void *data;
132 	};
133 };
134 
135 /* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
136 #define FETCH_INSN_MAX	16
137 #define FETCH_TOKEN_COMM	(-ECOMM)
138 
139 /* Fetch type information table */
140 struct fetch_type {
141 	const char		*name;		/* Name of type */
142 	size_t			size;		/* Byte size of type */
143 	bool			is_signed;	/* Signed flag */
144 	bool			is_string;	/* String flag */
145 	print_type_func_t	print;		/* Print functions */
146 	const char		*fmt;		/* Format string */
147 	const char		*fmttype;	/* Name in format file */
148 };
149 
150 /* For defining macros, define string/string_size types */
151 typedef u32 string;
152 typedef u32 string_size;
153 
154 #define PRINT_TYPE_FUNC_NAME(type)	print_type_##type
155 #define PRINT_TYPE_FMT_NAME(type)	print_type_format_##type
156 
157 /* Printing  in basic type function template */
158 #define DECLARE_BASIC_PRINT_TYPE_FUNC(type)				\
159 int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
160 extern const char PRINT_TYPE_FMT_NAME(type)[]
161 
162 DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
163 DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
164 DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
165 DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
166 DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
167 DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
168 DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
169 DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
170 DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
171 DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
172 DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
173 DECLARE_BASIC_PRINT_TYPE_FUNC(x64);
174 
175 DECLARE_BASIC_PRINT_TYPE_FUNC(char);
176 DECLARE_BASIC_PRINT_TYPE_FUNC(string);
177 DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);
178 
179 /* Default (unsigned long) fetch type */
180 #define __DEFAULT_FETCH_TYPE(t) x##t
181 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
182 #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
183 #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
184 
185 #define __ADDR_FETCH_TYPE(t) u##t
186 #define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
187 #define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)
188 
189 #define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, str, _fmttype)	\
190 	{.name = _name,					\
191 	 .size = _size,					\
192 	 .is_signed = (bool)sign,			\
193 	 .is_string = (bool)str,			\
194 	 .print = PRINT_TYPE_FUNC_NAME(ptype),		\
195 	 .fmt = PRINT_TYPE_FMT_NAME(ptype),		\
196 	 .fmttype = _fmttype,				\
197 	}
198 
199 /* Non string types can use these macros */
200 #define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)	\
201 	__ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, 0, #_fmttype)
202 #define ASSIGN_FETCH_TYPE(ptype, ftype, sign)			\
203 	_ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)
204 
205 /* If ptype is an alias of atype, use this macro (show atype in format) */
206 #define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign)		\
207 	_ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)
208 
209 #define ASSIGN_FETCH_TYPE_END {}
210 #define MAX_ARRAY_LEN	64
211 
212 #ifdef CONFIG_KPROBE_EVENTS
213 bool trace_kprobe_on_func_entry(struct trace_event_call *call);
214 bool trace_kprobe_error_injectable(struct trace_event_call *call);
215 #else
trace_kprobe_on_func_entry(struct trace_event_call * call)216 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
217 {
218 	return false;
219 }
220 
trace_kprobe_error_injectable(struct trace_event_call * call)221 static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
222 {
223 	return false;
224 }
225 #endif /* CONFIG_KPROBE_EVENTS */
226 
227 struct probe_arg {
228 	struct fetch_insn	*code;
229 	bool			dynamic;/* Dynamic array (string) is used */
230 	unsigned int		offset;	/* Offset from argument entry */
231 	unsigned int		count;	/* Array count */
232 	const char		*name;	/* Name of this argument */
233 	const char		*comm;	/* Command of this argument */
234 	char			*fmt;	/* Format string if needed */
235 	const struct fetch_type	*type;	/* Type of this argument */
236 };
237 
238 struct probe_entry_arg {
239 	struct fetch_insn	*code;
240 	unsigned int		size;	/* The entry data size */
241 };
242 
243 struct trace_uprobe_filter {
244 	rwlock_t		rwlock;
245 	int			nr_systemwide;
246 	struct list_head	perf_events;
247 };
248 
249 /* Event call and class holder */
250 struct trace_probe_event {
251 	unsigned int			flags;	/* For TP_FLAG_* */
252 	struct trace_event_class	class;
253 	struct trace_event_call		call;
254 	struct list_head 		files;
255 	struct list_head		probes;
256 	struct trace_uprobe_filter	filter[];
257 };
258 
259 struct trace_probe {
260 	struct list_head		list;
261 	struct trace_probe_event	*event;
262 	ssize_t				size;	/* trace entry size */
263 	unsigned int			nr_args;
264 	struct probe_entry_arg		*entry_arg;	/* This is only for return probe */
265 	struct probe_arg		args[];
266 };
267 
268 struct event_file_link {
269 	struct trace_event_file		*file;
270 	struct list_head		list;
271 };
272 
trace_probe_test_flag(struct trace_probe * tp,unsigned int flag)273 static inline bool trace_probe_test_flag(struct trace_probe *tp,
274 					 unsigned int flag)
275 {
276 	return !!(tp->event->flags & flag);
277 }
278 
trace_probe_set_flag(struct trace_probe * tp,unsigned int flag)279 static inline void trace_probe_set_flag(struct trace_probe *tp,
280 					unsigned int flag)
281 {
282 	tp->event->flags |= flag;
283 }
284 
trace_probe_clear_flag(struct trace_probe * tp,unsigned int flag)285 static inline void trace_probe_clear_flag(struct trace_probe *tp,
286 					  unsigned int flag)
287 {
288 	tp->event->flags &= ~flag;
289 }
290 
trace_probe_is_enabled(struct trace_probe * tp)291 static inline bool trace_probe_is_enabled(struct trace_probe *tp)
292 {
293 	return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE);
294 }
295 
trace_probe_name(struct trace_probe * tp)296 static inline const char *trace_probe_name(struct trace_probe *tp)
297 {
298 	return trace_event_name(&tp->event->call);
299 }
300 
trace_probe_group_name(struct trace_probe * tp)301 static inline const char *trace_probe_group_name(struct trace_probe *tp)
302 {
303 	return tp->event->call.class->system;
304 }
305 
306 static inline struct trace_event_call *
trace_probe_event_call(struct trace_probe * tp)307 	trace_probe_event_call(struct trace_probe *tp)
308 {
309 	return &tp->event->call;
310 }
311 
312 static inline struct trace_probe_event *
trace_probe_event_from_call(struct trace_event_call * event_call)313 trace_probe_event_from_call(struct trace_event_call *event_call)
314 {
315 	return container_of(event_call, struct trace_probe_event, call);
316 }
317 
318 static inline struct trace_probe *
trace_probe_primary_from_call(struct trace_event_call * call)319 trace_probe_primary_from_call(struct trace_event_call *call)
320 {
321 	struct trace_probe_event *tpe = trace_probe_event_from_call(call);
322 
323 	return list_first_entry_or_null(&tpe->probes, struct trace_probe, list);
324 }
325 
trace_probe_probe_list(struct trace_probe * tp)326 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
327 {
328 	return &tp->event->probes;
329 }
330 
trace_probe_has_sibling(struct trace_probe * tp)331 static inline bool trace_probe_has_sibling(struct trace_probe *tp)
332 {
333 	struct list_head *list = trace_probe_probe_list(tp);
334 
335 	return !list_empty(list) && !list_is_singular(list);
336 }
337 
trace_probe_unregister_event_call(struct trace_probe * tp)338 static inline int trace_probe_unregister_event_call(struct trace_probe *tp)
339 {
340 	/* tp->event is unregistered in trace_remove_event_call() */
341 	return trace_remove_event_call(&tp->event->call);
342 }
343 
trace_probe_has_single_file(struct trace_probe * tp)344 static inline bool trace_probe_has_single_file(struct trace_probe *tp)
345 {
346 	return !!list_is_singular(&tp->event->files);
347 }
348 
349 int trace_probe_init(struct trace_probe *tp, const char *event,
350 		     const char *group, bool alloc_filter, int nargs);
351 void trace_probe_cleanup(struct trace_probe *tp);
352 int trace_probe_append(struct trace_probe *tp, struct trace_probe *to);
353 void trace_probe_unlink(struct trace_probe *tp);
354 int trace_probe_register_event_call(struct trace_probe *tp);
355 int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file);
356 int trace_probe_remove_file(struct trace_probe *tp,
357 			    struct trace_event_file *file);
358 struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
359 						struct trace_event_file *file);
360 int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b);
361 bool trace_probe_match_command_args(struct trace_probe *tp,
362 				    int argc, const char **argv);
363 int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **));
364 int trace_probe_print_args(struct trace_seq *s, struct probe_arg *args, int nr_args,
365 		 u8 *data, void *field);
366 
367 #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
368 int traceprobe_get_entry_data_size(struct trace_probe *tp);
369 /* This is a runtime function to store entry data */
370 void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs);
371 #else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */
traceprobe_get_entry_data_size(struct trace_probe * tp)372 static inline int traceprobe_get_entry_data_size(struct trace_probe *tp)
373 {
374 	return 0;
375 }
376 #define store_trace_entry_data(edata, tp, regs) do { } while (0)
377 #endif
378 
379 #define trace_probe_for_each_link(pos, tp)	\
380 	list_for_each_entry(pos, &(tp)->event->files, list)
381 #define trace_probe_for_each_link_rcu(pos, tp)	\
382 	list_for_each_entry_rcu(pos, &(tp)->event->files, list)
383 
384 /*
385  * The flags used for parsing trace_probe arguments.
386  * TPARG_FL_RETURN, TPARG_FL_FENTRY and TPARG_FL_TEVENT are mutually exclusive.
387  * TPARG_FL_KERNEL and TPARG_FL_USER are also mutually exclusive.
388  * TPARG_FL_FPROBE and TPARG_FL_TPOINT are optional but it should be with
389  * TPARG_FL_KERNEL.
390  */
391 #define TPARG_FL_RETURN BIT(0)
392 #define TPARG_FL_KERNEL BIT(1)
393 #define TPARG_FL_FENTRY BIT(2)
394 #define TPARG_FL_TEVENT BIT(3)
395 #define TPARG_FL_USER   BIT(4)
396 #define TPARG_FL_FPROBE BIT(5)
397 #define TPARG_FL_TPOINT BIT(6)
398 #define TPARG_FL_LOC_MASK	GENMASK(4, 0)
399 
tparg_is_function_entry(unsigned int flags)400 static inline bool tparg_is_function_entry(unsigned int flags)
401 {
402 	return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY);
403 }
404 
tparg_is_function_return(unsigned int flags)405 static inline bool tparg_is_function_return(unsigned int flags)
406 {
407 	return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN);
408 }
409 
410 struct traceprobe_parse_context {
411 	struct trace_event_call *event;
412 	/* BTF related parameters */
413 	const char *funcname;		/* Function name in BTF */
414 	const struct btf_type  *proto;	/* Prototype of the function */
415 	const struct btf_param *params;	/* Parameter of the function */
416 	s32 nr_params;			/* The number of the parameters */
417 	struct btf *btf;		/* The BTF to be used */
418 	const struct btf_type *last_type;	/* Saved type */
419 	u32 last_bitoffs;		/* Saved bitoffs */
420 	u32 last_bitsize;		/* Saved bitsize */
421 	struct trace_probe *tp;
422 	unsigned int flags;
423 	int offset;
424 };
425 
426 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
427 				      const char *argv,
428 				      struct traceprobe_parse_context *ctx);
429 const char **traceprobe_expand_meta_args(int argc, const char *argv[],
430 					 int *new_argc, char *buf, int bufsize,
431 					 struct traceprobe_parse_context *ctx);
432 extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf);
433 
434 extern int traceprobe_update_arg(struct probe_arg *arg);
435 extern void traceprobe_free_probe_arg(struct probe_arg *arg);
436 
437 /*
438  * If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called,
439  * this MUST be called for clean up the context and return a resource.
440  */
441 void traceprobe_finish_parse(struct traceprobe_parse_context *ctx);
442 
443 extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
444 int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
445 				char *buf, int offset);
446 
447 enum probe_print_type {
448 	PROBE_PRINT_NORMAL,
449 	PROBE_PRINT_RETURN,
450 	PROBE_PRINT_EVENT,
451 };
452 
453 extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype);
454 
455 #ifdef CONFIG_PERF_EVENTS
456 extern struct trace_event_call *
457 create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
458 			  bool is_return);
459 extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
460 
461 extern struct trace_event_call *
462 create_local_trace_uprobe(char *name, unsigned long offs,
463 			  unsigned long ref_ctr_offset, bool is_return);
464 extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
465 #endif
466 extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
467 					size_t offset, struct trace_probe *tp);
468 
469 #undef ERRORS
470 #define ERRORS	\
471 	C(FILE_NOT_FOUND,	"Failed to find the given file"),	\
472 	C(NO_REGULAR_FILE,	"Not a regular file"),			\
473 	C(BAD_REFCNT,		"Invalid reference counter offset"),	\
474 	C(REFCNT_OPEN_BRACE,	"Reference counter brace is not closed"), \
475 	C(BAD_REFCNT_SUFFIX,	"Reference counter has wrong suffix"),	\
476 	C(BAD_UPROBE_OFFS,	"Invalid uprobe offset"),		\
477 	C(BAD_MAXACT_TYPE,	"Maxactive is only for function exit"),	\
478 	C(BAD_MAXACT,		"Invalid maxactive number"),		\
479 	C(MAXACT_TOO_BIG,	"Maxactive is too big"),		\
480 	C(BAD_PROBE_ADDR,	"Invalid probed address or symbol"),	\
481 	C(NON_UNIQ_SYMBOL,	"The symbol is not unique"),		\
482 	C(BAD_RETPROBE,		"Retprobe address must be an function entry"), \
483 	C(NO_TRACEPOINT,	"Tracepoint is not found"),		\
484 	C(BAD_ADDR_SUFFIX,	"Invalid probed address suffix"), \
485 	C(NO_GROUP_NAME,	"Group name is not specified"),		\
486 	C(GROUP_TOO_LONG,	"Group name is too long"),		\
487 	C(BAD_GROUP_NAME,	"Group name must follow the same rules as C identifiers"), \
488 	C(NO_EVENT_NAME,	"Event name is not specified"),		\
489 	C(EVENT_TOO_LONG,	"Event name is too long"),		\
490 	C(BAD_EVENT_NAME,	"Event name must follow the same rules as C identifiers"), \
491 	C(EVENT_EXIST,		"Given group/event name is already used by another event"), \
492 	C(RETVAL_ON_PROBE,	"$retval is not available on probe"),	\
493 	C(NO_RETVAL,		"This function returns 'void' type"),	\
494 	C(BAD_STACK_NUM,	"Invalid stack number"),		\
495 	C(BAD_ARG_NUM,		"Invalid argument number"),		\
496 	C(BAD_VAR,		"Invalid $-valiable specified"),	\
497 	C(BAD_REG_NAME,		"Invalid register name"),		\
498 	C(BAD_MEM_ADDR,		"Invalid memory address"),		\
499 	C(BAD_IMM,		"Invalid immediate value"),		\
500 	C(IMMSTR_NO_CLOSE,	"String is not closed with '\"'"),	\
501 	C(FILE_ON_KPROBE,	"File offset is not available with kprobe"), \
502 	C(BAD_FILE_OFFS,	"Invalid file offset value"),		\
503 	C(SYM_ON_UPROBE,	"Symbol is not available with uprobe"),	\
504 	C(TOO_MANY_OPS,		"Dereference is too much nested"), 	\
505 	C(DEREF_NEED_BRACE,	"Dereference needs a brace"),		\
506 	C(BAD_DEREF_OFFS,	"Invalid dereference offset"),		\
507 	C(DEREF_OPEN_BRACE,	"Dereference brace is not closed"),	\
508 	C(COMM_CANT_DEREF,	"$comm can not be dereferenced"),	\
509 	C(BAD_FETCH_ARG,	"Invalid fetch argument"),		\
510 	C(ARRAY_NO_CLOSE,	"Array is not closed"),			\
511 	C(BAD_ARRAY_SUFFIX,	"Array has wrong suffix"),		\
512 	C(BAD_ARRAY_NUM,	"Invalid array size"),			\
513 	C(ARRAY_TOO_BIG,	"Array number is too big"),		\
514 	C(BAD_TYPE,		"Unknown type is specified"),		\
515 	C(BAD_STRING,		"String accepts only memory argument"),	\
516 	C(BAD_SYMSTRING,	"Symbol String doesn't accept data/userdata"),	\
517 	C(BAD_BITFIELD,		"Invalid bitfield"),			\
518 	C(ARG_NAME_TOO_LONG,	"Argument name is too long"),		\
519 	C(NO_ARG_NAME,		"Argument name is not specified"),	\
520 	C(BAD_ARG_NAME,		"Argument name must follow the same rules as C identifiers"), \
521 	C(USED_ARG_NAME,	"This argument name is already used"),	\
522 	C(ARG_TOO_LONG,		"Argument expression is too long"),	\
523 	C(NO_ARG_BODY,		"No argument expression"),		\
524 	C(BAD_INSN_BNDRY,	"Probe point is not an instruction boundary"),\
525 	C(FAIL_REG_PROBE,	"Failed to register probe event"),\
526 	C(DIFF_PROBE_TYPE,	"Probe type is different from existing probe"),\
527 	C(DIFF_ARG_TYPE,	"Argument type or name is different from existing probe"),\
528 	C(SAME_PROBE,		"There is already the exact same probe event"),\
529 	C(NO_EVENT_INFO,	"This requires both group and event name to attach"),\
530 	C(BAD_ATTACH_EVENT,	"Attached event does not exist"),\
531 	C(BAD_ATTACH_ARG,	"Attached event does not have this field"),\
532 	C(NO_EP_FILTER,		"No filter rule after 'if'"),		\
533 	C(NOSUP_BTFARG,		"BTF is not available or not supported"),	\
534 	C(NO_BTFARG,		"This variable is not found at this probe point"),\
535 	C(NO_BTF_ENTRY,		"No BTF entry for this probe point"),	\
536 	C(BAD_VAR_ARGS,		"$arg* must be an independent parameter without name etc."),\
537 	C(NOFENTRY_ARGS,	"$arg* can be used only on function entry or exit"),	\
538 	C(DOUBLE_ARGS,		"$arg* can be used only once in the parameters"),	\
539 	C(ARGS_2LONG,		"$arg* failed because the argument list is too long"),	\
540 	C(ARGIDX_2BIG,		"$argN index is too big"),		\
541 	C(NO_PTR_STRCT,		"This is not a pointer to union/structure."),	\
542 	C(NOSUP_DAT_ARG,	"Non pointer structure/union argument is not supported."),\
543 	C(BAD_HYPHEN,		"Failed to parse single hyphen. Forgot '>'?"),	\
544 	C(NO_BTF_FIELD,		"This field is not found."),	\
545 	C(BAD_BTF_TID,		"Failed to get BTF type info."),\
546 	C(BAD_TYPE4STR,		"This type does not fit for string."),\
547 	C(NEED_STRING_TYPE,	"$comm and immediate-string only accepts string type"),
548 
549 #undef C
550 #define C(a, b)		TP_ERR_##a
551 
552 /* Define TP_ERR_ */
553 enum { ERRORS };
554 
555 /* Error text is defined in trace_probe.c */
556 
557 struct trace_probe_log {
558 	const char	*subsystem;
559 	const char	**argv;
560 	int		argc;
561 	int		index;
562 };
563 
564 void trace_probe_log_init(const char *subsystem, int argc, const char **argv);
565 void trace_probe_log_set_index(int index);
566 void trace_probe_log_clear(void);
567 void __trace_probe_log_err(int offset, int err);
568 
569 #define trace_probe_log_err(offs, err)	\
570 	__trace_probe_log_err(offs, TP_ERR_##err)
571 
572 struct uprobe_dispatch_data {
573 	struct trace_uprobe	*tu;
574 	unsigned long		bp_addr;
575 };
576