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 69 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent) 70 { 71 return (u8 *)ent + get_loc_offs(*dl); 72 } 73 74 static 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 */ 83 typedef int (*print_type_func_t)(struct trace_seq *, void *, void *); 84 85 enum 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 }; 117 118 struct 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 */ 141 struct 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 */ 152 typedef u32 string; 153 typedef 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) \ 160 int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\ 161 extern const char PRINT_TYPE_FMT_NAME(type)[] 162 163 DECLARE_BASIC_PRINT_TYPE_FUNC(u8); 164 DECLARE_BASIC_PRINT_TYPE_FUNC(u16); 165 DECLARE_BASIC_PRINT_TYPE_FUNC(u32); 166 DECLARE_BASIC_PRINT_TYPE_FUNC(u64); 167 DECLARE_BASIC_PRINT_TYPE_FUNC(s8); 168 DECLARE_BASIC_PRINT_TYPE_FUNC(s16); 169 DECLARE_BASIC_PRINT_TYPE_FUNC(s32); 170 DECLARE_BASIC_PRINT_TYPE_FUNC(s64); 171 DECLARE_BASIC_PRINT_TYPE_FUNC(x8); 172 DECLARE_BASIC_PRINT_TYPE_FUNC(x16); 173 DECLARE_BASIC_PRINT_TYPE_FUNC(x32); 174 DECLARE_BASIC_PRINT_TYPE_FUNC(x64); 175 176 DECLARE_BASIC_PRINT_TYPE_FUNC(char); 177 DECLARE_BASIC_PRINT_TYPE_FUNC(string); 178 DECLARE_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 214 bool trace_kprobe_on_func_entry(struct trace_event_call *call); 215 bool trace_kprobe_error_injectable(struct trace_event_call *call); 216 #else 217 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call) 218 { 219 return false; 220 } 221 222 static inline bool trace_kprobe_error_injectable(struct trace_event_call *call) 223 { 224 return false; 225 } 226 #endif /* CONFIG_KPROBE_EVENTS */ 227 228 struct 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 }; 238 239 struct probe_entry_arg { 240 struct fetch_insn *code; 241 unsigned int size; /* The entry data size */ 242 }; 243 244 struct 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 */ 251 struct 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 }; 259 260 struct 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 }; 268 269 struct event_file_link { 270 struct trace_event_file *file; 271 struct list_head list; 272 }; 273 274 static inline unsigned int trace_probe_load_flag(struct trace_probe *tp) 275 { 276 return smp_load_acquire(&tp->event->flags); 277 } 278 279 static inline bool trace_probe_test_flag(struct trace_probe *tp, 280 unsigned int flag) 281 { 282 return !!(trace_probe_load_flag(tp) & flag); 283 } 284 285 static 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 } 290 291 static inline void trace_probe_clear_flag(struct trace_probe *tp, 292 unsigned int flag) 293 { 294 tp->event->flags &= ~flag; 295 } 296 297 static 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 } 301 302 static inline const char *trace_probe_name(struct trace_probe *tp) 303 { 304 return trace_event_name(&tp->event->call); 305 } 306 307 static inline const char *trace_probe_group_name(struct trace_probe *tp) 308 { 309 return tp->event->call.class->system; 310 } 311 312 static inline struct trace_event_call * 313 trace_probe_event_call(struct trace_probe *tp) 314 { 315 return &tp->event->call; 316 } 317 318 static inline struct trace_probe_event * 319 trace_probe_event_from_call(struct trace_event_call *event_call) 320 { 321 return container_of(event_call, struct trace_probe_event, call); 322 } 323 324 static inline struct trace_probe * 325 trace_probe_primary_from_call(struct trace_event_call *call) 326 { 327 struct trace_probe_event *tpe = trace_probe_event_from_call(call); 328 329 return list_first_entry_or_null(&tpe->probes, struct trace_probe, list); 330 } 331 332 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp) 333 { 334 return &tp->event->probes; 335 } 336 337 static 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(list) && !list_is_singular(list); 342 } 343 344 static 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(&tp->event->call); 348 } 349 350 static inline bool trace_probe_has_single_file(struct trace_probe *tp) 351 { 352 return !!list_is_singular(&tp->event->files); 353 } 354 355 int trace_probe_init(struct trace_probe *tp, const char *event, 356 const char *group, bool alloc_filter, int nargs); 357 void trace_probe_cleanup(struct trace_probe *tp); 358 int trace_probe_append(struct trace_probe *tp, struct trace_probe *to); 359 void trace_probe_unlink(struct trace_probe *tp); 360 int trace_probe_register_event_call(struct trace_probe *tp); 361 int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file); 362 int trace_probe_remove_file(struct trace_probe *tp, 363 struct trace_event_file *file); 364 struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, 365 struct trace_event_file *file); 366 int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b); 367 bool trace_probe_match_command_args(struct trace_probe *tp, 368 int argc, const char **argv); 369 int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **)); 370 int 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 374 int traceprobe_get_entry_data_size(struct trace_probe *tp); 375 /* This is a runtime function to store entry data */ 376 void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs); 377 #else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */ 378 static 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) 405 406 static inline bool tparg_is_function_entry(unsigned int flags) 407 { 408 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY); 409 } 410 411 static inline bool tparg_is_function_return(unsigned int flags) 412 { 413 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN); 414 } 415 416 struct 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 }; 431 432 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, 433 const char *argv, 434 struct traceprobe_parse_context *ctx); 435 const char **traceprobe_expand_meta_args(int argc, const char *argv[], 436 int *new_argc, char *buf, int bufsize, 437 struct traceprobe_parse_context *ctx); 438 extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf); 439 440 extern int traceprobe_update_arg(struct probe_arg *arg); 441 extern 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 */ 447 void traceprobe_finish_parse(struct traceprobe_parse_context *ctx); 448 static inline void traceprobe_free_parse_ctx(struct traceprobe_parse_context *ctx) 449 { 450 traceprobe_finish_parse(ctx); 451 kfree(ctx); 452 } 453 454 DEFINE_FREE(traceprobe_parse_context, struct traceprobe_parse_context *, 455 if (_T) traceprobe_free_parse_ctx(_T)) 456 457 extern int traceprobe_split_symbol_offset(char *symbol, long *offset); 458 int traceprobe_parse_event_name(const char **pevent, const char **pgroup, 459 char *buf, int offset); 460 461 enum probe_print_type { 462 PROBE_PRINT_NORMAL, 463 PROBE_PRINT_RETURN, 464 PROBE_PRINT_EVENT, 465 }; 466 467 extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype); 468 469 #ifdef CONFIG_PERF_EVENTS 470 extern struct trace_event_call * 471 create_local_trace_kprobe(char *func, void *addr, unsigned long offs, 472 bool is_return); 473 extern void destroy_local_trace_kprobe(struct trace_event_call *event_call); 474 475 extern struct trace_event_call * 476 create_local_trace_uprobe(char *name, unsigned long offs, 477 unsigned long ref_ctr_offset, bool is_return); 478 extern void destroy_local_trace_uprobe(struct trace_event_call *event_call); 479 #endif 480 extern 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_ */ 570 enum { ERRORS }; 571 572 /* Error text is defined in trace_probe.c */ 573 574 struct trace_probe_log { 575 const char *subsystem; 576 const char **argv; 577 int argc; 578 int index; 579 }; 580 581 void trace_probe_log_init(const char *subsystem, int argc, const char **argv); 582 void trace_probe_log_set_index(int index); 583 void trace_probe_log_clear(void); 584 void __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) 588 589 struct uprobe_dispatch_data { 590 struct trace_uprobe *tu; 591 unsigned long bp_addr; 592 }; 593