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
68 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
69 {
70 return (u8 *)ent + get_loc_offs(*dl);
71 }
72
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
216 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
217 {
218 return false;
219 }
220
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
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
279 static inline void trace_probe_set_flag(struct trace_probe *tp,
280 unsigned int flag)
281 {
282 tp->event->flags |= flag;
283 }
284
285 static inline void trace_probe_clear_flag(struct trace_probe *tp,
286 unsigned int flag)
287 {
288 tp->event->flags &= ~flag;
289 }
290
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
296 static inline const char *trace_probe_name(struct trace_probe *tp)
297 {
298 return trace_event_name(&tp->event->call);
299 }
300
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 *
307 trace_probe_event_call(struct trace_probe *tp)
308 {
309 return &tp->event->call;
310 }
311
312 static inline struct trace_probe_event *
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 *
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
326 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
327 {
328 return &tp->event->probes;
329 }
330
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
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
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 */
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
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
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
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