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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 <[email protected]>
7 *
8 * Updates to make this generic:
9 * Copyright (C) IBM Corporation, 2010-2011
10 * Author: Srikar Dronamraju
11 */
12
13#include <linux/bitops.h>
14#include <linux/btf.h>
15#include <linux/cleanup.h>
16#include <linux/kprobes.h>
17#include <linux/limits.h>
18#include <linux/perf_event.h>
19#include <linux/ptrace.h>
20#include <linux/seq_file.h>
21#include <linux/slab.h>
22#include <linux/smp.h>
23#include <linux/string.h>
24#include <linux/stringify.h>
25#include <linux/tracefs.h>
26#include <linux/types.h>
27#include <linux/uaccess.h>
28
29#include <asm/bitsperlong.h>
30
31#include "trace.h"
32#include "trace_output.h"
33
34#define MAX_TRACE_ARGS 128
35#define MAX_ARGSTR_LEN 255
36#define MAX_ARRAY_LEN 64
37#define MAX_ARG_NAME_LEN 32
38#define MAX_BTF_ARGS_LEN 128
39#define MAX_DENTRY_ARGS_LEN 256
40#define MAX_STRING_SIZE PATH_MAX
41#define MAX_PROBE_EVENT_SIZE 3072
42
43/* Reserved field names */
44#define FIELD_STRING_IP "__probe_ip"
45#define FIELD_STRING_RETIP "__probe_ret_ip"
46#define FIELD_STRING_FUNC "__probe_func"
47
48#undef DEFINE_FIELD
49#define DEFINE_FIELD(type, item, name, is_signed) \
50 do { \
51 ret = trace_define_field(event_call, #type, name, \
52 offsetof(typeof(field), item), \
53 sizeof(field.item), is_signed, \
54 FILTER_OTHER); \
55 if (ret) \
56 return ret; \
57 } while (0)
58
59
60/* Flags for trace_probe */
61#define TP_FLAG_TRACE 1
62#define TP_FLAG_PROFILE 2
63
64/* data_loc: data location, compatible with u32 */
65#define make_data_loc(len, offs) \
66 (((u32)(len) << 16) | ((u32)(offs) & 0xffff))
67#define get_loc_len(dl) ((u32)(dl) >> 16)
68#define get_loc_offs(dl) ((u32)(dl) & 0xffff)
69
70static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
71{
72 return (u8 *)ent + get_loc_offs(*dl);
73}
74
75static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
76{
77 u32 maxlen = get_loc_len(loc);
78 u32 offset = get_loc_offs(loc);
79
80 return make_data_loc(maxlen - consumed, offset + consumed);
81}
82
83/* Printing function type */
84typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);
85
86#define FETCH_OP_LIST { \
87 /* Stage 1 (load) ops */ \
88 FETCH_OP(NOP, none), /* NOP */ \
89 FETCH_OP(REG, param), /* Register: .param = offset */ \
90 FETCH_OP(STACK, param), /* Stack: .param = index */ \
91 FETCH_OP(STACKP, none), /* Stack pointer */ \
92 FETCH_OP(RETVAL, none), /* Return value */ \
93 FETCH_OP(IMM, imm), /* Immediate: .immediate */ \
94 FETCH_OP(COMM, none), /* Current comm */ \
95 FETCH_OP(CURRENT, none), /* Current task_struct address */\
96 FETCH_OP(ARG, param), /* Argument: .param = index */ \
97 FETCH_OP(FOFFS, imm), /* File offset: .immediate */ \
98 FETCH_OP(IMMSTR, string), /* Allocated string: .data */ \
99 FETCH_OP(EDATA, offset), /* Entry data: .offset */ \
100 FETCH_OP(TP_ARG, tp_arg), /* Tracepoint argument: .data */\
101 /* Stage 2 (dereference) ops */ \
102 FETCH_OP(DEREF, offset), /* Dereference: .offset */ \
103 FETCH_OP(UDEREF, offset), /* User-space dereference: .offset */\
104 FETCH_OP(CPU_PTR, none), /* Per-CPU pointer: .offset */ \
105 /* Stage 3 (store) ops */ \
106 FETCH_OP(ST_RAW, store), /* Raw value: .size */ \
107 FETCH_OP(ST_MEM, store), /* Memory: .offset, .size */ \
108 FETCH_OP(ST_UMEM, store), /* User memory: .offset, .size */\
109 FETCH_OP(ST_STRING, store), /* String: .offset, .size */ \
110 FETCH_OP(ST_USTRING, store), /* User string: .offset, .size */\
111 FETCH_OP(ST_SYMSTR, store), /* Symbol name: .offset, .size */\
112 FETCH_OP(ST_EDATA, offset), /* Entry data: .offset */ \
113 /* Stage 4 (modify) op */ \
114 FETCH_OP(MOD_BF, bf), /* Bitfield: .basesize, .lshift, .rshift*/\
115 /* Stage 5 (loop) op */ \
116 FETCH_OP(LP_ARRAY, param), /* Loop array: .param = count */\
117 /* End */ \
118 FETCH_OP(END, none), \
119 /* Unresolved Symbol holder */ \
120 FETCH_OP(NOP_SYMBOL, symbol), /* Non loaded symbol: .data = symbol name */\
121}
122
123#define FETCH_OP(opname, decode_fn) FETCH_OP_##opname
124enum fetch_op FETCH_OP_LIST;
125#undef FETCH_OP
126
127#define FETCH_NOP_SYMBOL FETCH_OP_NOP_SYMBOL
128
129struct fetch_insn {
130 enum fetch_op op;
131 union {
132 unsigned int param;
133 struct {
134 unsigned int size;
135 int offset;
136 };
137 struct {
138 unsigned char basesize;
139 unsigned char lshift;
140 unsigned char rshift;
141 };
142 unsigned long immediate;
143 void *data;
144 };
145};
146
147/* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
148#define FETCH_INSN_MAX 16
149#define FETCH_TOKEN_COMM (-ECOMM)
150
151/* Fetch type information table */
152struct fetch_type {
153 const char *name; /* Name of type */
154 size_t size; /* Byte size of type */
155 bool is_signed; /* Signed flag */
156 bool is_string; /* String flag */
157 print_type_func_t print; /* Print functions */
158 const char *fmt; /* Format string */
159 const char *fmttype; /* Name in format file */
160};
161
162/* For defining macros, define string/string_size types */
163typedef u32 string;
164typedef u32 string_size;
165
166#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
167#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
168
169/* Printing in basic type function template */
170#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
171int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
172extern const char PRINT_TYPE_FMT_NAME(type)[]
173
174DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
175DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
176DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
177DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
178DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
179DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
180DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
181DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
182DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
183DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
184DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
185DECLARE_BASIC_PRINT_TYPE_FUNC(x64);
186
187DECLARE_BASIC_PRINT_TYPE_FUNC(char);
188DECLARE_BASIC_PRINT_TYPE_FUNC(string);
189DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);
190
191/* Default (unsigned long) fetch type */
192#define __DEFAULT_FETCH_TYPE(t) x##t
193#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
194#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
195#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
196
197#define __ADDR_FETCH_TYPE(t) u##t
198#define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
199#define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)
200
201#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, str, _fmttype) \
202 {.name = _name, \
203 .size = _size, \
204 .is_signed = (bool)sign, \
205 .is_string = (bool)str, \
206 .print = PRINT_TYPE_FUNC_NAME(ptype), \
207 .fmt = PRINT_TYPE_FMT_NAME(ptype), \
208 .fmttype = _fmttype, \
209 }
210
211/* Non string types can use these macros */
212#define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
213 __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, 0, #_fmttype)
214#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
215 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)
216
217/* If ptype is an alias of atype, use this macro (show atype in format) */
218#define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign) \
219 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)
220
221#define ASSIGN_FETCH_TYPE_END {}
222
223#ifdef CONFIG_KPROBE_EVENTS
224bool trace_kprobe_on_func_entry(struct trace_event_call *call);
225bool trace_kprobe_error_injectable(struct trace_event_call *call);
226#else
227static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
228{
229 return false;
230}
231
232static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
233{
234 return false;
235}
236#endif /* CONFIG_KPROBE_EVENTS */
237
238struct probe_arg {
239 struct fetch_insn *code;
240 bool dynamic;/* Dynamic array (string) is used */
241 unsigned int offset; /* Offset from argument entry */
242 unsigned int count; /* Array count */
243 const char *name; /* Name of this argument */
244 const char *comm; /* Command of this argument */
245 char *fmt; /* Format string if needed */
246 const struct fetch_type *type; /* Type of this argument */
247};
248
249struct probe_entry_arg {
250 unsigned int size; /* The entry data size */
251 struct fetch_insn code[] __counted_by(size);
252};
253
254struct trace_uprobe_filter {
255 rwlock_t rwlock;
256 int nr_systemwide;
257 struct list_head perf_events;
258};
259
260/* Event call and class holder */
261struct trace_probe_event {
262 unsigned int flags; /* For TP_FLAG_* */
263 struct trace_event_class class;
264 struct trace_event_call call;
265 struct list_head files;
266 struct list_head probes;
267 char **field_strings;
268 int nr_field_strings;
269 struct trace_uprobe_filter filter[];
270};
271
272struct trace_probe {
273 struct list_head list;
274 struct trace_probe_event *event;
275 ssize_t size; /* trace entry size */
276 unsigned int nr_args;
277 struct probe_entry_arg *entry_arg; /* This is only for return probe */
278 struct probe_arg args[];
279};
280
281struct event_file_link {
282 struct trace_event_file *file;
283 struct list_head list;
284};
285
286static inline unsigned int trace_probe_load_flag(struct trace_probe *tp)
287{
288 return smp_load_acquire(&tp->event->flags);
289}
290
291static inline bool trace_probe_test_flag(struct trace_probe *tp,
292 unsigned int flag)
293{
294 return !!(trace_probe_load_flag(tp) & flag);
295}
296
297static inline void trace_probe_set_flag(struct trace_probe *tp,
298 unsigned int flag)
299{
300 smp_store_release(&tp->event->flags, tp->event->flags | flag);
301}
302
303static inline void trace_probe_clear_flag(struct trace_probe *tp,
304 unsigned int flag)
305{
306 tp->event->flags &= ~flag;
307}
308
309static inline bool trace_probe_is_enabled(struct trace_probe *tp)
310{
311 return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE);
312}
313
314static inline const char *trace_probe_name(struct trace_probe *tp)
315{
316 return trace_event_name(&tp->event->call);
317}
318
319static inline const char *trace_probe_group_name(struct trace_probe *tp)
320{
321 return tp->event->call.class->system;
322}
323
324static inline struct trace_event_call *
325 trace_probe_event_call(struct trace_probe *tp)
326{
327 return &tp->event->call;
328}
329
330static inline struct trace_probe_event *
331trace_probe_event_from_call(struct trace_event_call *event_call)
332{
333 return container_of(event_call, struct trace_probe_event, call);
334}
335
336static inline struct trace_probe *
337trace_probe_primary_from_call(struct trace_event_call *call)
338{
339 struct trace_probe_event *tpe = trace_probe_event_from_call(call);
340
341 return list_first_entry_or_null(&tpe->probes, struct trace_probe, list);
342}
343
344static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
345{
346 return &tp->event->probes;
347}
348
349static inline bool trace_probe_has_sibling(struct trace_probe *tp)
350{
351 struct list_head *list = trace_probe_probe_list(tp);
352
353 return !list_empty(list) && !list_is_singular(list);
354}
355
356static inline int trace_probe_unregister_event_call(struct trace_probe *tp)
357{
358 /* tp->event is unregistered in trace_remove_event_call() */
359 return trace_remove_event_call(&tp->event->call);
360}
361
362static inline bool trace_probe_has_single_file(struct trace_probe *tp)
363{
364 return list_is_singular(&tp->event->files);
365}
366
367int trace_probe_init(struct trace_probe *tp, const char *event,
368 const char *group, bool alloc_filter, int nargs);
369void trace_probe_cleanup(struct trace_probe *tp);
370int trace_probe_append(struct trace_probe *tp, struct trace_probe *to);
371void trace_probe_unlink(struct trace_probe *tp);
372int trace_probe_register_event_call(struct trace_probe *tp);
373int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file);
374int trace_probe_remove_file(struct trace_probe *tp,
375 struct trace_event_file *file);
376struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
377 struct trace_event_file *file);
378int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b);
379bool trace_probe_match_command_args(struct trace_probe *tp,
380 int argc, const char **argv);
381int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **));
382int trace_probe_print_args(struct trace_seq *s, struct probe_arg *args, int nr_args,
383 u8 *data, void *field);
384#ifdef CONFIG_PROBE_EVENTS_DUMP_FETCHARG
385void trace_probe_dump_args(struct seq_file *m, struct trace_probe *tp);
386#else
387static inline void trace_probe_dump_args(struct seq_file *m, struct trace_probe *tp)
388{
389}
390#endif
391
392#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
393int traceprobe_get_entry_data_size(struct trace_probe *tp);
394/* This is a runtime function to store entry data */
395void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs);
396#else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */
397static inline int traceprobe_get_entry_data_size(struct trace_probe *tp)
398{
399 return 0;
400}
401#define store_trace_entry_data(edata, tp, regs) do { } while (0)
402#endif
403
404#define trace_probe_for_each_link(pos, tp) \
405 list_for_each_entry(pos, &(tp)->event->files, list)
406#define trace_probe_for_each_link_rcu(pos, tp) \
407 list_for_each_entry_rcu(pos, &(tp)->event->files, list)
408
409/*
410 * The flags used for parsing trace_probe arguments.
411 * TPARG_FL_RETURN, TPARG_FL_FENTRY and TPARG_FL_TEVENT are mutually exclusive.
412 * TPARG_FL_KERNEL and TPARG_FL_USER are also mutually exclusive.
413 * TPARG_FL_FPROBE and TPARG_FL_TPOINT are optional but it should be with
414 * TPARG_FL_KERNEL.
415 */
416#define TPARG_FL_RETURN BIT(0)
417#define TPARG_FL_KERNEL BIT(1)
418#define TPARG_FL_FENTRY BIT(2)
419#define TPARG_FL_TEVENT BIT(3)
420#define TPARG_FL_USER BIT(4)
421#define TPARG_FL_FPROBE BIT(5)
422#define TPARG_FL_TPOINT BIT(6)
423#define TPARG_FL_LOC_MASK GENMASK(4, 0)
424
425static inline bool tparg_is_function_entry(unsigned int flags)
426{
427 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY);
428}
429
430static inline bool tparg_is_function_return(unsigned int flags)
431{
432 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN);
433}
434
435static inline bool tparg_is_event_probe(unsigned int flags)
436{
437 return !!(flags & TPARG_FL_TEVENT);
438}
439
440/* Each typecast consumes nested level. So the max number of typecast is 8. */
441#define TRACEPROBE_MAX_NESTED_LEVEL 8
442
443enum parse_state_type {
444 STATE_DEREF,
445 STATE_TYPECAST,
446};
447
448struct parse_state {
449 int type;
450 union {
451 struct {
452 int deref;
453 long offset;
454 int cur_offs;
455 char *inner_arg;
456 bool is_cpu_read;
457 } deref;
458 struct {
459 char *casttype;
460 char *fieldname;
461 int orig_offset;
462 int field_offset_diff;
463 char *inner_arg;
464 } typecast;
465 };
466};
467
468struct traceprobe_parse_context {
469 struct trace_event_call *event;
470 /* BTF related parameters */
471 const char *funcname; /* Function name in BTF */
472 const struct btf_type *proto; /* Prototype of the function */
473 const struct btf_param *params; /* Parameter of the function */
474 s32 nr_params; /* The number of the parameters */
475 struct btf *btf; /* The BTF to be used */
476 struct btf *struct_btf; /* The BTF to be used for structs */
477 const struct btf_type *last_type; /* Saved type */
478 const struct btf_type *last_struct; /* Saved structure */
479 u32 last_bitoffs; /* Saved bitoffs */
480 u32 last_bitsize; /* Saved bitsize */
481 struct trace_probe *tp;
482 unsigned int flags;
483 int offset;
484 int prefix_byteoffs; /* The byte offset of the prefix field of typecast */
485 struct parse_state stack[TRACEPROBE_MAX_NESTED_LEVEL + 1];
486 int depth;
487};
488
489
490extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
491 const char *argv,
492 struct traceprobe_parse_context *ctx);
493const char **traceprobe_expand_meta_args(int argc, const char *argv[],
494 int *new_argc, char *buf, int bufsize,
495 struct traceprobe_parse_context *ctx);
496extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf);
497
498extern int traceprobe_update_arg(struct probe_arg *arg);
499extern void traceprobe_free_probe_arg(struct probe_arg *arg);
500
501/*
502 * If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called,
503 * this MUST be called for clean up the context and return a resource.
504 */
505void traceprobe_finish_parse(struct traceprobe_parse_context *ctx);
506static inline void traceprobe_free_parse_ctx(struct traceprobe_parse_context *ctx)
507{
508 traceprobe_finish_parse(ctx);
509 kfree(ctx);
510}
511
512DEFINE_FREE(traceprobe_parse_context, struct traceprobe_parse_context *,
513 if (_T) traceprobe_free_parse_ctx(_T))
514
515extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
516int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
517 char *buf, int offset);
518
519enum probe_print_type {
520 PROBE_PRINT_NORMAL,
521 PROBE_PRINT_RETURN,
522 PROBE_PRINT_EVENT,
523};
524
525extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype);
526
527#ifdef CONFIG_PERF_EVENTS
528extern struct trace_event_call *
529create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
530 bool is_return);
531extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
532
533extern struct trace_event_call *
534create_local_trace_uprobe(char *name, unsigned long offs,
535 unsigned long ref_ctr_offset, bool is_return);
536extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
537#endif
538extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
539 size_t offset, struct trace_probe *tp);
540
541#undef ERRORS
542#define ERRORS \
543 C(ARGIDX_2BIG, "$argN index is too big"), \
544 C(ARGS_2LONG, "$arg* failed because the argument list is too long"), \
545 C(ARG_NAME_TOO_LONG, "Argument name is too long"), \
546 C(ARG_TOO_LONG, "Argument expression is too long"), \
547 C(ARRAY_NO_CLOSE, "Array is not closed"), \
548 C(ARRAY_TOO_BIG, "Array number is too big"), \
549 C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \
550 C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \
551 C(BAD_ARG_NUM, "Invalid argument number"), \
552 C(BAD_ARRAY_NUM, "Invalid array size"), \
553 C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \
554 C(BAD_ATTACH_ARG, "Attached event does not have this field"), \
555 C(BAD_ATTACH_EVENT, "Attached event does not exist"), \
556 C(BAD_BITFIELD, "Invalid bitfield"), \
557 C(BAD_BTF_TID, "Failed to get BTF type info."), \
558 C(BAD_DEREF_OFFS, "Invalid dereference offset"), \
559 C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
560 C(BAD_FETCH_ARG, "Invalid fetch argument"), \
561 C(BAD_FILE_OFFS, "Invalid file offset value"), \
562 C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \
563 C(BAD_HYPHEN, "Failed to parse single hyphen. Forgot '>'?"), \
564 C(BAD_IMM, "Invalid immediate value"), \
565 C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"), \
566 C(BAD_MAXACT, "Invalid maxactive number"), \
567 C(BAD_MAXACT_TYPE, "Maxactive is only for function exit"), \
568 C(BAD_MEM_ADDR, "Invalid memory address"), \
569 C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
570 C(BAD_REFCNT, "Invalid reference counter offset"), \
571 C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \
572 C(BAD_REG_NAME, "Invalid register name"), \
573 C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
574 C(BAD_STACK_NUM, "Invalid stack number"), \
575 C(BAD_STRING, "String accepts only memory argument"), \
576 C(BAD_SYMSTRING, "Symbol String doesn't accept data/userdata"), \
577 C(BAD_TP_NAME, "Invalid character in tracepoint name"), \
578 C(BAD_TYPE, "Unknown type is specified"), \
579 C(BAD_TYPE4STR, "This type does not fit for string."), \
580 C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \
581 C(BAD_VAR, "Invalid $-variable specified"), \
582 C(BAD_VAR_ARGS, "$arg* must be an independent parameter without name etc."), \
583 C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \
584 C(DEREF_NEED_BRACE, "Dereference needs a brace"), \
585 C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \
586 C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"), \
587 C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"), \
588 C(DOUBLE_ARGS, "$arg* can be used only once in the parameters"), \
589 C(EVENT_EXIST, "Given group/event name is already used by another event"), \
590 C(EVENT_TOO_BIG, "Event too big (too many fields?)"), \
591 C(EVENT_TOO_LONG, "Event name is too long"), \
592 C(FAIL_REG_PROBE, "Failed to register probe event"), \
593 C(FILE_NOT_FOUND, "Failed to find the given file"), \
594 C(FILE_ON_KPROBE, "File offset is not available for kernel probes"), \
595 C(GROUP_TOO_LONG, "Group name is too long"), \
596 C(IMMSTR_NO_CLOSE, "String is not closed with '\"'"), \
597 C(MAXACT_TOO_BIG, "Maxactive is too big"), \
598 C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"), \
599 C(NOFENTRY_ARGS, "$arg* can be used only on function entry or exit"), \
600 C(NON_UNIQ_SYMBOL, "The symbol is not unique"), \
601 C(NOSUP_BTFARG, "BTF is not available or not supported"), \
602 C(NOSUP_DAT_ARG, "Non pointer structure/union argument is not supported."), \
603 C(NOSUP_PERCPU, "Per-cpu variable access is only for kernel probes"), \
604 C(NO_ARG_BODY, "No argument expression"), \
605 C(NO_ARG_NAME, "Argument name is not specified"), \
606 C(NO_BTFARG, "This variable is not found at this probe point"), \
607 C(NO_BTF_ENTRY, "No BTF entry for this probe point"), \
608 C(NO_BTF_FIELD, "This field is not found."), \
609 C(NO_EP_FILTER, "No filter rule after 'if'"), \
610 C(NO_EVENT_FIELD, "This event field is not found."), \
611 C(NO_EVENT_INFO, "This requires both group and event name to attach"), \
612 C(NO_EVENT_NAME, "Event name is not specified"), \
613 C(NO_GROUP_NAME, "Group name is not specified"), \
614 C(NO_PTR_STRCT, "This is not a pointer to union/structure."), \
615 C(NO_REGULAR_FILE, "Not a regular file"), \
616 C(NO_RETVAL, "This function returns 'void' type"), \
617 C(NO_TRACEPOINT, "Tracepoint is not found"), \
618 C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \
619 C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
620 C(SAME_PROBE, "There is already the exact same probe event"), \
621 C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \
622 C(TOO_MANY_ARGS, "Too many arguments are specified"), \
623 C(TOO_MANY_EARGS, "Too many entry arguments specified"), \
624 C(TOO_MANY_NESTED, "Too many nested typecasts/dereferences"), \
625 C(TOO_MANY_OPS, "Dereference is too much nested"), \
626 C(TYPECAST_BAD_ARROW, "Typecast field option does not support -> operator"), \
627 C(TYPECAST_NOT_ALIGNED, "Typecast field option is not byte-aligned"), \
628 C(TYPECAST_NOT_EVENT, "Typecasts are only for eprobe fields"), \
629 C(TYPECAST_REQ_FIELD, "Typecast requires a field access"), \
630 C(TYPECAST_SYM_OFFSET, "@SYM+/-OFFSET with typecast needs parentheses"), \
631 C(USED_ARG_NAME, "This argument name is already used"),
632
633#undef C
634#define C(a, b) TP_ERR_##a
635
636/* Define TP_ERR_ */
637enum { ERRORS };
638
639/* Error text is defined in trace_probe.c */
640
641struct trace_probe_log {
642 const char *subsystem;
643 const char **argv;
644 int argc;
645 int index;
646};
647
648const char *trace_probe_log_init(const char *subsystem, int argc, const char **argv);
649void trace_probe_log_set_index(int index);
650void trace_probe_log_clear(void);
651void __trace_probe_log_err(int offset, int err);
652
653DEFINE_FREE(trace_probe_log_clear, const char *, if (_T) trace_probe_log_clear())
654
655#define trace_probe_log_err(offs, err) \
656 __trace_probe_log_err(offs, TP_ERR_##err)
657
658struct uprobe_dispatch_data {
659 struct trace_uprobe *tu;
660 unsigned long bp_addr;
661};