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