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 #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 70 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent) 71 { 72 return (u8 *)ent + get_loc_offs(*dl); 73 } 74 75 static 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 */ 84 typedef 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 124 enum fetch_op FETCH_OP_LIST; 125 #undef FETCH_OP 126 127 #define FETCH_NOP_SYMBOL FETCH_OP_NOP_SYMBOL 128 129 struct 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 */ 152 struct 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 */ 163 typedef u32 string; 164 typedef 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) \ 171 int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\ 172 extern const char PRINT_TYPE_FMT_NAME(type)[] 173 174 DECLARE_BASIC_PRINT_TYPE_FUNC(u8); 175 DECLARE_BASIC_PRINT_TYPE_FUNC(u16); 176 DECLARE_BASIC_PRINT_TYPE_FUNC(u32); 177 DECLARE_BASIC_PRINT_TYPE_FUNC(u64); 178 DECLARE_BASIC_PRINT_TYPE_FUNC(s8); 179 DECLARE_BASIC_PRINT_TYPE_FUNC(s16); 180 DECLARE_BASIC_PRINT_TYPE_FUNC(s32); 181 DECLARE_BASIC_PRINT_TYPE_FUNC(s64); 182 DECLARE_BASIC_PRINT_TYPE_FUNC(x8); 183 DECLARE_BASIC_PRINT_TYPE_FUNC(x16); 184 DECLARE_BASIC_PRINT_TYPE_FUNC(x32); 185 DECLARE_BASIC_PRINT_TYPE_FUNC(x64); 186 187 DECLARE_BASIC_PRINT_TYPE_FUNC(char); 188 DECLARE_BASIC_PRINT_TYPE_FUNC(string); 189 DECLARE_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 #define MAX_ARRAY_LEN 64 223 224 #ifdef CONFIG_KPROBE_EVENTS 225 bool trace_kprobe_on_func_entry(struct trace_event_call *call); 226 bool trace_kprobe_error_injectable(struct trace_event_call *call); 227 #else 228 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call) 229 { 230 return false; 231 } 232 233 static inline bool trace_kprobe_error_injectable(struct trace_event_call *call) 234 { 235 return false; 236 } 237 #endif /* CONFIG_KPROBE_EVENTS */ 238 239 struct probe_arg { 240 struct fetch_insn *code; 241 bool dynamic;/* Dynamic array (string) is used */ 242 unsigned int offset; /* Offset from argument entry */ 243 unsigned int count; /* Array count */ 244 const char *name; /* Name of this argument */ 245 const char *comm; /* Command of this argument */ 246 char *fmt; /* Format string if needed */ 247 const struct fetch_type *type; /* Type of this argument */ 248 }; 249 250 struct probe_entry_arg { 251 unsigned int size; /* The entry data size */ 252 struct fetch_insn code[] __counted_by(size); 253 }; 254 255 struct trace_uprobe_filter { 256 rwlock_t rwlock; 257 int nr_systemwide; 258 struct list_head perf_events; 259 }; 260 261 /* Event call and class holder */ 262 struct trace_probe_event { 263 unsigned int flags; /* For TP_FLAG_* */ 264 struct trace_event_class class; 265 struct trace_event_call call; 266 struct list_head files; 267 struct list_head probes; 268 struct trace_uprobe_filter filter[]; 269 }; 270 271 struct trace_probe { 272 struct list_head list; 273 struct trace_probe_event *event; 274 ssize_t size; /* trace entry size */ 275 unsigned int nr_args; 276 struct probe_entry_arg *entry_arg; /* This is only for return probe */ 277 struct probe_arg args[]; 278 }; 279 280 struct event_file_link { 281 struct trace_event_file *file; 282 struct list_head list; 283 }; 284 285 static inline unsigned int trace_probe_load_flag(struct trace_probe *tp) 286 { 287 return smp_load_acquire(&tp->event->flags); 288 } 289 290 static inline bool trace_probe_test_flag(struct trace_probe *tp, 291 unsigned int flag) 292 { 293 return !!(trace_probe_load_flag(tp) & flag); 294 } 295 296 static inline void trace_probe_set_flag(struct trace_probe *tp, 297 unsigned int flag) 298 { 299 smp_store_release(&tp->event->flags, tp->event->flags | flag); 300 } 301 302 static inline void trace_probe_clear_flag(struct trace_probe *tp, 303 unsigned int flag) 304 { 305 tp->event->flags &= ~flag; 306 } 307 308 static inline bool trace_probe_is_enabled(struct trace_probe *tp) 309 { 310 return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE); 311 } 312 313 static inline const char *trace_probe_name(struct trace_probe *tp) 314 { 315 return trace_event_name(&tp->event->call); 316 } 317 318 static inline const char *trace_probe_group_name(struct trace_probe *tp) 319 { 320 return tp->event->call.class->system; 321 } 322 323 static inline struct trace_event_call * 324 trace_probe_event_call(struct trace_probe *tp) 325 { 326 return &tp->event->call; 327 } 328 329 static inline struct trace_probe_event * 330 trace_probe_event_from_call(struct trace_event_call *event_call) 331 { 332 return container_of(event_call, struct trace_probe_event, call); 333 } 334 335 static inline struct trace_probe * 336 trace_probe_primary_from_call(struct trace_event_call *call) 337 { 338 struct trace_probe_event *tpe = trace_probe_event_from_call(call); 339 340 return list_first_entry_or_null(&tpe->probes, struct trace_probe, list); 341 } 342 343 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp) 344 { 345 return &tp->event->probes; 346 } 347 348 static inline bool trace_probe_has_sibling(struct trace_probe *tp) 349 { 350 struct list_head *list = trace_probe_probe_list(tp); 351 352 return !list_empty(list) && !list_is_singular(list); 353 } 354 355 static inline int trace_probe_unregister_event_call(struct trace_probe *tp) 356 { 357 /* tp->event is unregistered in trace_remove_event_call() */ 358 return trace_remove_event_call(&tp->event->call); 359 } 360 361 static inline bool trace_probe_has_single_file(struct trace_probe *tp) 362 { 363 return !!list_is_singular(&tp->event->files); 364 } 365 366 int trace_probe_init(struct trace_probe *tp, const char *event, 367 const char *group, bool alloc_filter, int nargs); 368 void trace_probe_cleanup(struct trace_probe *tp); 369 int trace_probe_append(struct trace_probe *tp, struct trace_probe *to); 370 void trace_probe_unlink(struct trace_probe *tp); 371 int trace_probe_register_event_call(struct trace_probe *tp); 372 int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file); 373 int trace_probe_remove_file(struct trace_probe *tp, 374 struct trace_event_file *file); 375 struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, 376 struct trace_event_file *file); 377 int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b); 378 bool trace_probe_match_command_args(struct trace_probe *tp, 379 int argc, const char **argv); 380 int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **)); 381 int trace_probe_print_args(struct trace_seq *s, struct probe_arg *args, int nr_args, 382 u8 *data, void *field); 383 #ifdef CONFIG_PROBE_EVENTS_DUMP_FETCHARG 384 void trace_probe_dump_args(struct seq_file *m, struct trace_probe *tp); 385 #else 386 static inline void trace_probe_dump_args(struct seq_file *m, struct trace_probe *tp) 387 { 388 } 389 #endif 390 391 #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API 392 int traceprobe_get_entry_data_size(struct trace_probe *tp); 393 /* This is a runtime function to store entry data */ 394 void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs); 395 #else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */ 396 static inline int traceprobe_get_entry_data_size(struct trace_probe *tp) 397 { 398 return 0; 399 } 400 #define store_trace_entry_data(edata, tp, regs) do { } while (0) 401 #endif 402 403 #define trace_probe_for_each_link(pos, tp) \ 404 list_for_each_entry(pos, &(tp)->event->files, list) 405 #define trace_probe_for_each_link_rcu(pos, tp) \ 406 list_for_each_entry_rcu(pos, &(tp)->event->files, list) 407 408 /* 409 * The flags used for parsing trace_probe arguments. 410 * TPARG_FL_RETURN, TPARG_FL_FENTRY and TPARG_FL_TEVENT are mutually exclusive. 411 * TPARG_FL_KERNEL and TPARG_FL_USER are also mutually exclusive. 412 * TPARG_FL_FPROBE and TPARG_FL_TPOINT are optional but it should be with 413 * TPARG_FL_KERNEL. 414 */ 415 #define TPARG_FL_RETURN BIT(0) 416 #define TPARG_FL_KERNEL BIT(1) 417 #define TPARG_FL_FENTRY BIT(2) 418 #define TPARG_FL_TEVENT BIT(3) 419 #define TPARG_FL_USER BIT(4) 420 #define TPARG_FL_FPROBE BIT(5) 421 #define TPARG_FL_TPOINT BIT(6) 422 #define TPARG_FL_LOC_MASK GENMASK(4, 0) 423 424 static inline bool tparg_is_function_entry(unsigned int flags) 425 { 426 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY); 427 } 428 429 static inline bool tparg_is_function_return(unsigned int flags) 430 { 431 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN); 432 } 433 434 static inline bool tparg_is_event_probe(unsigned int flags) 435 { 436 return !!(flags & TPARG_FL_TEVENT); 437 } 438 439 struct traceprobe_parse_context { 440 struct trace_event_call *event; 441 /* BTF related parameters */ 442 const char *funcname; /* Function name in BTF */ 443 const struct btf_type *proto; /* Prototype of the function */ 444 const struct btf_param *params; /* Parameter of the function */ 445 s32 nr_params; /* The number of the parameters */ 446 struct btf *btf; /* The BTF to be used */ 447 struct btf *struct_btf; /* The BTF to be used for structs */ 448 const struct btf_type *last_type; /* Saved type */ 449 const struct btf_type *last_struct; /* Saved structure */ 450 u32 last_bitoffs; /* Saved bitoffs */ 451 u32 last_bitsize; /* Saved bitsize */ 452 struct trace_probe *tp; 453 unsigned int flags; 454 int offset; 455 int nested_level; 456 int prefix_byteoffs; /* The byte offset of the prefix field of typecast */ 457 }; 458 459 /* Each typecast consumes nested level. So the max number of typecast is 3. */ 460 #define TRACEPROBE_MAX_NESTED_LEVEL 3 461 462 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, 463 const char *argv, 464 struct traceprobe_parse_context *ctx); 465 const char **traceprobe_expand_meta_args(int argc, const char *argv[], 466 int *new_argc, char *buf, int bufsize, 467 struct traceprobe_parse_context *ctx); 468 extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf); 469 470 extern int traceprobe_update_arg(struct probe_arg *arg); 471 extern void traceprobe_free_probe_arg(struct probe_arg *arg); 472 473 /* 474 * If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called, 475 * this MUST be called for clean up the context and return a resource. 476 */ 477 void traceprobe_finish_parse(struct traceprobe_parse_context *ctx); 478 static inline void traceprobe_free_parse_ctx(struct traceprobe_parse_context *ctx) 479 { 480 traceprobe_finish_parse(ctx); 481 kfree(ctx); 482 } 483 484 DEFINE_FREE(traceprobe_parse_context, struct traceprobe_parse_context *, 485 if (_T) traceprobe_free_parse_ctx(_T)) 486 487 extern int traceprobe_split_symbol_offset(char *symbol, long *offset); 488 int traceprobe_parse_event_name(const char **pevent, const char **pgroup, 489 char *buf, int offset); 490 491 enum probe_print_type { 492 PROBE_PRINT_NORMAL, 493 PROBE_PRINT_RETURN, 494 PROBE_PRINT_EVENT, 495 }; 496 497 extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype); 498 499 #ifdef CONFIG_PERF_EVENTS 500 extern struct trace_event_call * 501 create_local_trace_kprobe(char *func, void *addr, unsigned long offs, 502 bool is_return); 503 extern void destroy_local_trace_kprobe(struct trace_event_call *event_call); 504 505 extern struct trace_event_call * 506 create_local_trace_uprobe(char *name, unsigned long offs, 507 unsigned long ref_ctr_offset, bool is_return); 508 extern void destroy_local_trace_uprobe(struct trace_event_call *event_call); 509 #endif 510 extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, 511 size_t offset, struct trace_probe *tp); 512 513 #undef ERRORS 514 #define ERRORS \ 515 C(FILE_NOT_FOUND, "Failed to find the given file"), \ 516 C(NO_REGULAR_FILE, "Not a regular file"), \ 517 C(BAD_REFCNT, "Invalid reference counter offset"), \ 518 C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \ 519 C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \ 520 C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \ 521 C(BAD_MAXACT_TYPE, "Maxactive is only for function exit"), \ 522 C(BAD_MAXACT, "Invalid maxactive number"), \ 523 C(MAXACT_TOO_BIG, "Maxactive is too big"), \ 524 C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \ 525 C(NON_UNIQ_SYMBOL, "The symbol is not unique"), \ 526 C(BAD_RETPROBE, "Retprobe address must be an function entry"), \ 527 C(NO_TRACEPOINT, "Tracepoint is not found"), \ 528 C(BAD_TP_NAME, "Invalid character in tracepoint name"),\ 529 C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \ 530 C(NO_GROUP_NAME, "Group name is not specified"), \ 531 C(GROUP_TOO_LONG, "Group name is too long"), \ 532 C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \ 533 C(NO_EVENT_NAME, "Event name is not specified"), \ 534 C(EVENT_TOO_LONG, "Event name is too long"), \ 535 C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \ 536 C(EVENT_EXIST, "Given group/event name is already used by another event"), \ 537 C(RETVAL_ON_PROBE, "$retval is not available on probe"), \ 538 C(NO_RETVAL, "This function returns 'void' type"), \ 539 C(BAD_STACK_NUM, "Invalid stack number"), \ 540 C(BAD_ARG_NUM, "Invalid argument number"), \ 541 C(BAD_VAR, "Invalid $-variable specified"), \ 542 C(BAD_REG_NAME, "Invalid register name"), \ 543 C(BAD_MEM_ADDR, "Invalid memory address"), \ 544 C(BAD_IMM, "Invalid immediate value"), \ 545 C(IMMSTR_NO_CLOSE, "String is not closed with '\"'"), \ 546 C(FILE_ON_KPROBE, "File offset is not available for kernel probes"), \ 547 C(BAD_FILE_OFFS, "Invalid file offset value"), \ 548 C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \ 549 C(TOO_MANY_OPS, "Dereference is too much nested"), \ 550 C(DEREF_NEED_BRACE, "Dereference needs a brace"), \ 551 C(BAD_DEREF_OFFS, "Invalid dereference offset"), \ 552 C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \ 553 C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \ 554 C(BAD_FETCH_ARG, "Invalid fetch argument"), \ 555 C(ARRAY_NO_CLOSE, "Array is not closed"), \ 556 C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \ 557 C(BAD_ARRAY_NUM, "Invalid array size"), \ 558 C(ARRAY_TOO_BIG, "Array number is too big"), \ 559 C(BAD_TYPE, "Unknown type is specified"), \ 560 C(BAD_STRING, "String accepts only memory argument"), \ 561 C(BAD_SYMSTRING, "Symbol String doesn't accept data/userdata"), \ 562 C(BAD_BITFIELD, "Invalid bitfield"), \ 563 C(ARG_NAME_TOO_LONG, "Argument name is too long"), \ 564 C(NO_ARG_NAME, "Argument name is not specified"), \ 565 C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \ 566 C(USED_ARG_NAME, "This argument name is already used"), \ 567 C(ARG_TOO_LONG, "Argument expression is too long"), \ 568 C(NO_ARG_BODY, "No argument expression"), \ 569 C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\ 570 C(FAIL_REG_PROBE, "Failed to register probe event"),\ 571 C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"),\ 572 C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"),\ 573 C(SAME_PROBE, "There is already the exact same probe event"),\ 574 C(NO_EVENT_INFO, "This requires both group and event name to attach"),\ 575 C(BAD_ATTACH_EVENT, "Attached event does not exist"),\ 576 C(BAD_ATTACH_ARG, "Attached event does not have this field"),\ 577 C(NO_EP_FILTER, "No filter rule after 'if'"), \ 578 C(NOSUP_BTFARG, "BTF is not available or not supported"), \ 579 C(NO_BTFARG, "This variable is not found at this probe point"),\ 580 C(NO_BTF_ENTRY, "No BTF entry for this probe point"), \ 581 C(BAD_VAR_ARGS, "$arg* must be an independent parameter without name etc."),\ 582 C(NOFENTRY_ARGS, "$arg* can be used only on function entry or exit"), \ 583 C(DOUBLE_ARGS, "$arg* can be used only once in the parameters"), \ 584 C(ARGS_2LONG, "$arg* failed because the argument list is too long"), \ 585 C(ARGIDX_2BIG, "$argN index is too big"), \ 586 C(NO_PTR_STRCT, "This is not a pointer to union/structure."), \ 587 C(NOSUP_DAT_ARG, "Non pointer structure/union argument is not supported."),\ 588 C(BAD_HYPHEN, "Failed to parse single hyphen. Forgot '>'?"), \ 589 C(NO_EVENT_FIELD, "This event field is not found."), \ 590 C(NO_BTF_FIELD, "This field is not found."), \ 591 C(BAD_BTF_TID, "Failed to get BTF type info."),\ 592 C(BAD_TYPE4STR, "This type does not fit for string."),\ 593 C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"),\ 594 C(TOO_MANY_ARGS, "Too many arguments are specified"), \ 595 C(TOO_MANY_EARGS, "Too many entry arguments specified"), \ 596 C(EVENT_TOO_BIG, "Event too big (too many fields?)"), \ 597 C(TYPECAST_NOT_EVENT, "Typecasts are only for eprobe fields"), \ 598 C(TYPECAST_REQ_FIELD, "Typecast requires a field access"), \ 599 C(TOO_MANY_NESTED, "Too many nested typecasts/dereferences"), \ 600 C(TYPECAST_SYM_OFFSET, "@SYM+/-OFFSET with typecast needs parentheses"), \ 601 C(TYPECAST_NOT_ALIGNED, "Typecast field option is not byte-aligned"), \ 602 C(TYPECAST_BAD_ARROW, "Typecast field option does not support -> operator"), \ 603 C(NOSUP_PERCPU, "Per-cpu variable access is only for kernel probes"), 604 605 #undef C 606 #define C(a, b) TP_ERR_##a 607 608 /* Define TP_ERR_ */ 609 enum { ERRORS }; 610 611 /* Error text is defined in trace_probe.c */ 612 613 struct trace_probe_log { 614 const char *subsystem; 615 const char **argv; 616 int argc; 617 int index; 618 }; 619 620 const char *trace_probe_log_init(const char *subsystem, int argc, const char **argv); 621 void trace_probe_log_set_index(int index); 622 void trace_probe_log_clear(void); 623 void __trace_probe_log_err(int offset, int err); 624 625 DEFINE_FREE(trace_probe_log_clear, const char *, if (_T) trace_probe_log_clear()) 626 627 #define trace_probe_log_err(offs, err) \ 628 __trace_probe_log_err(offs, TP_ERR_##err) 629 630 struct uprobe_dispatch_data { 631 struct trace_uprobe *tu; 632 unsigned long bp_addr; 633 }; 634