1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Common header file for probe-based Dynamic events. 4 * 5 * This code was copied from kernel/trace/trace_kprobe.h written by 6 * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> 7 * 8 * Updates to make this generic: 9 * Copyright (C) IBM Corporation, 2010-2011 10 * Author: Srikar Dronamraju 11 */ 12 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <linux/smp.h> 16 #include <linux/tracefs.h> 17 #include <linux/types.h> 18 #include <linux/string.h> 19 #include <linux/ptrace.h> 20 #include <linux/perf_event.h> 21 #include <linux/kprobes.h> 22 #include <linux/stringify.h> 23 #include <linux/limits.h> 24 #include <linux/uaccess.h> 25 #include <linux/bitops.h> 26 #include <linux/btf.h> 27 #include <asm/bitsperlong.h> 28 29 #include "trace.h" 30 #include "trace_output.h" 31 32 #define MAX_TRACE_ARGS 128 33 #define MAX_ARGSTR_LEN 63 34 #define MAX_ARRAY_LEN 64 35 #define MAX_ARG_NAME_LEN 32 36 #define MAX_BTF_ARGS_LEN 128 37 #define MAX_DENTRY_ARGS_LEN 256 38 #define MAX_STRING_SIZE PATH_MAX 39 #define MAX_ARG_BUF_LEN (MAX_TRACE_ARGS * MAX_ARG_NAME_LEN) 40 41 /* Reserved field names */ 42 #define FIELD_STRING_IP "__probe_ip" 43 #define FIELD_STRING_RETIP "__probe_ret_ip" 44 #define FIELD_STRING_FUNC "__probe_func" 45 46 #undef DEFINE_FIELD 47 #define DEFINE_FIELD(type, item, name, is_signed) \ 48 do { \ 49 ret = trace_define_field(event_call, #type, name, \ 50 offsetof(typeof(field), item), \ 51 sizeof(field.item), is_signed, \ 52 FILTER_OTHER); \ 53 if (ret) \ 54 return ret; \ 55 } while (0) 56 57 58 /* Flags for trace_probe */ 59 #define TP_FLAG_TRACE 1 60 #define TP_FLAG_PROFILE 2 61 62 /* data_loc: data location, compatible with u32 */ 63 #define make_data_loc(len, offs) \ 64 (((u32)(len) << 16) | ((u32)(offs) & 0xffff)) 65 #define get_loc_len(dl) ((u32)(dl) >> 16) 66 #define get_loc_offs(dl) ((u32)(dl) & 0xffff) 67 get_loc_data(u32 * dl,void * ent)68 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent) 69 { 70 return (u8 *)ent + get_loc_offs(*dl); 71 } 72 update_data_loc(u32 loc,int consumed)73 static nokprobe_inline u32 update_data_loc(u32 loc, int consumed) 74 { 75 u32 maxlen = get_loc_len(loc); 76 u32 offset = get_loc_offs(loc); 77 78 return make_data_loc(maxlen - consumed, offset + consumed); 79 } 80 81 /* Printing function type */ 82 typedef int (*print_type_func_t)(struct trace_seq *, void *, void *); 83 84 enum fetch_op { 85 FETCH_OP_NOP = 0, 86 // Stage 1 (load) ops 87 FETCH_OP_REG, /* Register : .param = offset */ 88 FETCH_OP_STACK, /* Stack : .param = index */ 89 FETCH_OP_STACKP, /* Stack pointer */ 90 FETCH_OP_RETVAL, /* Return value */ 91 FETCH_OP_IMM, /* Immediate : .immediate */ 92 FETCH_OP_COMM, /* Current comm */ 93 FETCH_OP_ARG, /* Function argument : .param */ 94 FETCH_OP_FOFFS, /* File offset: .immediate */ 95 FETCH_OP_DATA, /* Allocated data: .data */ 96 FETCH_OP_EDATA, /* Entry data: .offset */ 97 // Stage 2 (dereference) op 98 FETCH_OP_DEREF, /* Dereference: .offset */ 99 FETCH_OP_UDEREF, /* User-space Dereference: .offset */ 100 // Stage 3 (store) ops 101 FETCH_OP_ST_RAW, /* Raw: .size */ 102 FETCH_OP_ST_MEM, /* Mem: .offset, .size */ 103 FETCH_OP_ST_UMEM, /* Mem: .offset, .size */ 104 FETCH_OP_ST_STRING, /* String: .offset, .size */ 105 FETCH_OP_ST_USTRING, /* User String: .offset, .size */ 106 FETCH_OP_ST_SYMSTR, /* Kernel Symbol String: .offset, .size */ 107 FETCH_OP_ST_EDATA, /* Store Entry Data: .offset */ 108 // Stage 4 (modify) op 109 FETCH_OP_MOD_BF, /* Bitfield: .basesize, .lshift, .rshift */ 110 // Stage 5 (loop) op 111 FETCH_OP_LP_ARRAY, /* Array: .param = loop count */ 112 FETCH_OP_TP_ARG, /* Trace Point argument */ 113 FETCH_OP_END, 114 FETCH_NOP_SYMBOL, /* Unresolved Symbol holder */ 115 }; 116 117 struct fetch_insn { 118 enum fetch_op op; 119 union { 120 unsigned int param; 121 struct { 122 unsigned int size; 123 int offset; 124 }; 125 struct { 126 unsigned char basesize; 127 unsigned char lshift; 128 unsigned char rshift; 129 }; 130 unsigned long immediate; 131 void *data; 132 }; 133 }; 134 135 /* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */ 136 #define FETCH_INSN_MAX 16 137 #define FETCH_TOKEN_COMM (-ECOMM) 138 139 /* Fetch type information table */ 140 struct fetch_type { 141 const char *name; /* Name of type */ 142 size_t size; /* Byte size of type */ 143 bool is_signed; /* Signed flag */ 144 bool is_string; /* String flag */ 145 print_type_func_t print; /* Print functions */ 146 const char *fmt; /* Format string */ 147 const char *fmttype; /* Name in format file */ 148 }; 149 150 /* For defining macros, define string/string_size types */ 151 typedef u32 string; 152 typedef u32 string_size; 153 154 #define PRINT_TYPE_FUNC_NAME(type) print_type_##type 155 #define PRINT_TYPE_FMT_NAME(type) print_type_format_##type 156 157 /* Printing in basic type function template */ 158 #define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \ 159 int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\ 160 extern const char PRINT_TYPE_FMT_NAME(type)[] 161 162 DECLARE_BASIC_PRINT_TYPE_FUNC(u8); 163 DECLARE_BASIC_PRINT_TYPE_FUNC(u16); 164 DECLARE_BASIC_PRINT_TYPE_FUNC(u32); 165 DECLARE_BASIC_PRINT_TYPE_FUNC(u64); 166 DECLARE_BASIC_PRINT_TYPE_FUNC(s8); 167 DECLARE_BASIC_PRINT_TYPE_FUNC(s16); 168 DECLARE_BASIC_PRINT_TYPE_FUNC(s32); 169 DECLARE_BASIC_PRINT_TYPE_FUNC(s64); 170 DECLARE_BASIC_PRINT_TYPE_FUNC(x8); 171 DECLARE_BASIC_PRINT_TYPE_FUNC(x16); 172 DECLARE_BASIC_PRINT_TYPE_FUNC(x32); 173 DECLARE_BASIC_PRINT_TYPE_FUNC(x64); 174 175 DECLARE_BASIC_PRINT_TYPE_FUNC(char); 176 DECLARE_BASIC_PRINT_TYPE_FUNC(string); 177 DECLARE_BASIC_PRINT_TYPE_FUNC(symbol); 178 179 /* Default (unsigned long) fetch type */ 180 #define __DEFAULT_FETCH_TYPE(t) x##t 181 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t) 182 #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG) 183 #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE) 184 185 #define __ADDR_FETCH_TYPE(t) u##t 186 #define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t) 187 #define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG) 188 189 #define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, str, _fmttype) \ 190 {.name = _name, \ 191 .size = _size, \ 192 .is_signed = (bool)sign, \ 193 .is_string = (bool)str, \ 194 .print = PRINT_TYPE_FUNC_NAME(ptype), \ 195 .fmt = PRINT_TYPE_FMT_NAME(ptype), \ 196 .fmttype = _fmttype, \ 197 } 198 199 /* Non string types can use these macros */ 200 #define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \ 201 __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, 0, #_fmttype) 202 #define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \ 203 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype) 204 205 /* If ptype is an alias of atype, use this macro (show atype in format) */ 206 #define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign) \ 207 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype) 208 209 #define ASSIGN_FETCH_TYPE_END {} 210 #define MAX_ARRAY_LEN 64 211 212 #ifdef CONFIG_KPROBE_EVENTS 213 bool trace_kprobe_on_func_entry(struct trace_event_call *call); 214 bool trace_kprobe_error_injectable(struct trace_event_call *call); 215 #else trace_kprobe_on_func_entry(struct trace_event_call * call)216 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call) 217 { 218 return false; 219 } 220 trace_kprobe_error_injectable(struct trace_event_call * call)221 static inline bool trace_kprobe_error_injectable(struct trace_event_call *call) 222 { 223 return false; 224 } 225 #endif /* CONFIG_KPROBE_EVENTS */ 226 227 struct probe_arg { 228 struct fetch_insn *code; 229 bool dynamic;/* Dynamic array (string) is used */ 230 unsigned int offset; /* Offset from argument entry */ 231 unsigned int count; /* Array count */ 232 const char *name; /* Name of this argument */ 233 const char *comm; /* Command of this argument */ 234 char *fmt; /* Format string if needed */ 235 const struct fetch_type *type; /* Type of this argument */ 236 }; 237 238 struct probe_entry_arg { 239 struct fetch_insn *code; 240 unsigned int size; /* The entry data size */ 241 }; 242 243 struct trace_uprobe_filter { 244 rwlock_t rwlock; 245 int nr_systemwide; 246 struct list_head perf_events; 247 }; 248 249 /* Event call and class holder */ 250 struct trace_probe_event { 251 unsigned int flags; /* For TP_FLAG_* */ 252 struct trace_event_class class; 253 struct trace_event_call call; 254 struct list_head files; 255 struct list_head probes; 256 struct trace_uprobe_filter filter[]; 257 }; 258 259 struct trace_probe { 260 struct list_head list; 261 struct trace_probe_event *event; 262 ssize_t size; /* trace entry size */ 263 unsigned int nr_args; 264 struct probe_entry_arg *entry_arg; /* This is only for return probe */ 265 struct probe_arg args[]; 266 }; 267 268 struct event_file_link { 269 struct trace_event_file *file; 270 struct list_head list; 271 }; 272 trace_probe_test_flag(struct trace_probe * tp,unsigned int flag)273 static inline bool trace_probe_test_flag(struct trace_probe *tp, 274 unsigned int flag) 275 { 276 return !!(tp->event->flags & flag); 277 } 278 trace_probe_set_flag(struct trace_probe * tp,unsigned int flag)279 static inline void trace_probe_set_flag(struct trace_probe *tp, 280 unsigned int flag) 281 { 282 tp->event->flags |= flag; 283 } 284 trace_probe_clear_flag(struct trace_probe * tp,unsigned int flag)285 static inline void trace_probe_clear_flag(struct trace_probe *tp, 286 unsigned int flag) 287 { 288 tp->event->flags &= ~flag; 289 } 290 trace_probe_is_enabled(struct trace_probe * tp)291 static inline bool trace_probe_is_enabled(struct trace_probe *tp) 292 { 293 return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE); 294 } 295 trace_probe_name(struct trace_probe * tp)296 static inline const char *trace_probe_name(struct trace_probe *tp) 297 { 298 return trace_event_name(&tp->event->call); 299 } 300 trace_probe_group_name(struct trace_probe * tp)301 static inline const char *trace_probe_group_name(struct trace_probe *tp) 302 { 303 return tp->event->call.class->system; 304 } 305 306 static inline struct trace_event_call * trace_probe_event_call(struct trace_probe * tp)307 trace_probe_event_call(struct trace_probe *tp) 308 { 309 return &tp->event->call; 310 } 311 312 static inline struct trace_probe_event * trace_probe_event_from_call(struct trace_event_call * event_call)313 trace_probe_event_from_call(struct trace_event_call *event_call) 314 { 315 return container_of(event_call, struct trace_probe_event, call); 316 } 317 318 static inline struct trace_probe * trace_probe_primary_from_call(struct trace_event_call * call)319 trace_probe_primary_from_call(struct trace_event_call *call) 320 { 321 struct trace_probe_event *tpe = trace_probe_event_from_call(call); 322 323 return list_first_entry_or_null(&tpe->probes, struct trace_probe, list); 324 } 325 trace_probe_probe_list(struct trace_probe * tp)326 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp) 327 { 328 return &tp->event->probes; 329 } 330 trace_probe_has_sibling(struct trace_probe * tp)331 static inline bool trace_probe_has_sibling(struct trace_probe *tp) 332 { 333 struct list_head *list = trace_probe_probe_list(tp); 334 335 return !list_empty(list) && !list_is_singular(list); 336 } 337 trace_probe_unregister_event_call(struct trace_probe * tp)338 static inline int trace_probe_unregister_event_call(struct trace_probe *tp) 339 { 340 /* tp->event is unregistered in trace_remove_event_call() */ 341 return trace_remove_event_call(&tp->event->call); 342 } 343 trace_probe_has_single_file(struct trace_probe * tp)344 static inline bool trace_probe_has_single_file(struct trace_probe *tp) 345 { 346 return !!list_is_singular(&tp->event->files); 347 } 348 349 int trace_probe_init(struct trace_probe *tp, const char *event, 350 const char *group, bool alloc_filter, int nargs); 351 void trace_probe_cleanup(struct trace_probe *tp); 352 int trace_probe_append(struct trace_probe *tp, struct trace_probe *to); 353 void trace_probe_unlink(struct trace_probe *tp); 354 int trace_probe_register_event_call(struct trace_probe *tp); 355 int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file); 356 int trace_probe_remove_file(struct trace_probe *tp, 357 struct trace_event_file *file); 358 struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, 359 struct trace_event_file *file); 360 int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b); 361 bool trace_probe_match_command_args(struct trace_probe *tp, 362 int argc, const char **argv); 363 int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **)); 364 int trace_probe_print_args(struct trace_seq *s, struct probe_arg *args, int nr_args, 365 u8 *data, void *field); 366 367 #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API 368 int traceprobe_get_entry_data_size(struct trace_probe *tp); 369 /* This is a runtime function to store entry data */ 370 void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs); 371 #else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */ traceprobe_get_entry_data_size(struct trace_probe * tp)372 static inline int traceprobe_get_entry_data_size(struct trace_probe *tp) 373 { 374 return 0; 375 } 376 #define store_trace_entry_data(edata, tp, regs) do { } while (0) 377 #endif 378 379 #define trace_probe_for_each_link(pos, tp) \ 380 list_for_each_entry(pos, &(tp)->event->files, list) 381 #define trace_probe_for_each_link_rcu(pos, tp) \ 382 list_for_each_entry_rcu(pos, &(tp)->event->files, list) 383 384 /* 385 * The flags used for parsing trace_probe arguments. 386 * TPARG_FL_RETURN, TPARG_FL_FENTRY and TPARG_FL_TEVENT are mutually exclusive. 387 * TPARG_FL_KERNEL and TPARG_FL_USER are also mutually exclusive. 388 * TPARG_FL_FPROBE and TPARG_FL_TPOINT are optional but it should be with 389 * TPARG_FL_KERNEL. 390 */ 391 #define TPARG_FL_RETURN BIT(0) 392 #define TPARG_FL_KERNEL BIT(1) 393 #define TPARG_FL_FENTRY BIT(2) 394 #define TPARG_FL_TEVENT BIT(3) 395 #define TPARG_FL_USER BIT(4) 396 #define TPARG_FL_FPROBE BIT(5) 397 #define TPARG_FL_TPOINT BIT(6) 398 #define TPARG_FL_LOC_MASK GENMASK(4, 0) 399 tparg_is_function_entry(unsigned int flags)400 static inline bool tparg_is_function_entry(unsigned int flags) 401 { 402 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY); 403 } 404 tparg_is_function_return(unsigned int flags)405 static inline bool tparg_is_function_return(unsigned int flags) 406 { 407 return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN); 408 } 409 410 struct traceprobe_parse_context { 411 struct trace_event_call *event; 412 /* BTF related parameters */ 413 const char *funcname; /* Function name in BTF */ 414 const struct btf_type *proto; /* Prototype of the function */ 415 const struct btf_param *params; /* Parameter of the function */ 416 s32 nr_params; /* The number of the parameters */ 417 struct btf *btf; /* The BTF to be used */ 418 const struct btf_type *last_type; /* Saved type */ 419 u32 last_bitoffs; /* Saved bitoffs */ 420 u32 last_bitsize; /* Saved bitsize */ 421 struct trace_probe *tp; 422 unsigned int flags; 423 int offset; 424 }; 425 426 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, 427 const char *argv, 428 struct traceprobe_parse_context *ctx); 429 const char **traceprobe_expand_meta_args(int argc, const char *argv[], 430 int *new_argc, char *buf, int bufsize, 431 struct traceprobe_parse_context *ctx); 432 extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf); 433 434 extern int traceprobe_update_arg(struct probe_arg *arg); 435 extern void traceprobe_free_probe_arg(struct probe_arg *arg); 436 437 /* 438 * If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called, 439 * this MUST be called for clean up the context and return a resource. 440 */ 441 void traceprobe_finish_parse(struct traceprobe_parse_context *ctx); 442 443 extern int traceprobe_split_symbol_offset(char *symbol, long *offset); 444 int traceprobe_parse_event_name(const char **pevent, const char **pgroup, 445 char *buf, int offset); 446 447 enum probe_print_type { 448 PROBE_PRINT_NORMAL, 449 PROBE_PRINT_RETURN, 450 PROBE_PRINT_EVENT, 451 }; 452 453 extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype); 454 455 #ifdef CONFIG_PERF_EVENTS 456 extern struct trace_event_call * 457 create_local_trace_kprobe(char *func, void *addr, unsigned long offs, 458 bool is_return); 459 extern void destroy_local_trace_kprobe(struct trace_event_call *event_call); 460 461 extern struct trace_event_call * 462 create_local_trace_uprobe(char *name, unsigned long offs, 463 unsigned long ref_ctr_offset, bool is_return); 464 extern void destroy_local_trace_uprobe(struct trace_event_call *event_call); 465 #endif 466 extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, 467 size_t offset, struct trace_probe *tp); 468 469 #undef ERRORS 470 #define ERRORS \ 471 C(FILE_NOT_FOUND, "Failed to find the given file"), \ 472 C(NO_REGULAR_FILE, "Not a regular file"), \ 473 C(BAD_REFCNT, "Invalid reference counter offset"), \ 474 C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \ 475 C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \ 476 C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \ 477 C(BAD_MAXACT_TYPE, "Maxactive is only for function exit"), \ 478 C(BAD_MAXACT, "Invalid maxactive number"), \ 479 C(MAXACT_TOO_BIG, "Maxactive is too big"), \ 480 C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \ 481 C(NON_UNIQ_SYMBOL, "The symbol is not unique"), \ 482 C(BAD_RETPROBE, "Retprobe address must be an function entry"), \ 483 C(NO_TRACEPOINT, "Tracepoint is not found"), \ 484 C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \ 485 C(NO_GROUP_NAME, "Group name is not specified"), \ 486 C(GROUP_TOO_LONG, "Group name is too long"), \ 487 C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \ 488 C(NO_EVENT_NAME, "Event name is not specified"), \ 489 C(EVENT_TOO_LONG, "Event name is too long"), \ 490 C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \ 491 C(EVENT_EXIST, "Given group/event name is already used by another event"), \ 492 C(RETVAL_ON_PROBE, "$retval is not available on probe"), \ 493 C(NO_RETVAL, "This function returns 'void' type"), \ 494 C(BAD_STACK_NUM, "Invalid stack number"), \ 495 C(BAD_ARG_NUM, "Invalid argument number"), \ 496 C(BAD_VAR, "Invalid $-valiable specified"), \ 497 C(BAD_REG_NAME, "Invalid register name"), \ 498 C(BAD_MEM_ADDR, "Invalid memory address"), \ 499 C(BAD_IMM, "Invalid immediate value"), \ 500 C(IMMSTR_NO_CLOSE, "String is not closed with '\"'"), \ 501 C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \ 502 C(BAD_FILE_OFFS, "Invalid file offset value"), \ 503 C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \ 504 C(TOO_MANY_OPS, "Dereference is too much nested"), \ 505 C(DEREF_NEED_BRACE, "Dereference needs a brace"), \ 506 C(BAD_DEREF_OFFS, "Invalid dereference offset"), \ 507 C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \ 508 C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \ 509 C(BAD_FETCH_ARG, "Invalid fetch argument"), \ 510 C(ARRAY_NO_CLOSE, "Array is not closed"), \ 511 C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \ 512 C(BAD_ARRAY_NUM, "Invalid array size"), \ 513 C(ARRAY_TOO_BIG, "Array number is too big"), \ 514 C(BAD_TYPE, "Unknown type is specified"), \ 515 C(BAD_STRING, "String accepts only memory argument"), \ 516 C(BAD_SYMSTRING, "Symbol String doesn't accept data/userdata"), \ 517 C(BAD_BITFIELD, "Invalid bitfield"), \ 518 C(ARG_NAME_TOO_LONG, "Argument name is too long"), \ 519 C(NO_ARG_NAME, "Argument name is not specified"), \ 520 C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \ 521 C(USED_ARG_NAME, "This argument name is already used"), \ 522 C(ARG_TOO_LONG, "Argument expression is too long"), \ 523 C(NO_ARG_BODY, "No argument expression"), \ 524 C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\ 525 C(FAIL_REG_PROBE, "Failed to register probe event"),\ 526 C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"),\ 527 C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"),\ 528 C(SAME_PROBE, "There is already the exact same probe event"),\ 529 C(NO_EVENT_INFO, "This requires both group and event name to attach"),\ 530 C(BAD_ATTACH_EVENT, "Attached event does not exist"),\ 531 C(BAD_ATTACH_ARG, "Attached event does not have this field"),\ 532 C(NO_EP_FILTER, "No filter rule after 'if'"), \ 533 C(NOSUP_BTFARG, "BTF is not available or not supported"), \ 534 C(NO_BTFARG, "This variable is not found at this probe point"),\ 535 C(NO_BTF_ENTRY, "No BTF entry for this probe point"), \ 536 C(BAD_VAR_ARGS, "$arg* must be an independent parameter without name etc."),\ 537 C(NOFENTRY_ARGS, "$arg* can be used only on function entry or exit"), \ 538 C(DOUBLE_ARGS, "$arg* can be used only once in the parameters"), \ 539 C(ARGS_2LONG, "$arg* failed because the argument list is too long"), \ 540 C(ARGIDX_2BIG, "$argN index is too big"), \ 541 C(NO_PTR_STRCT, "This is not a pointer to union/structure."), \ 542 C(NOSUP_DAT_ARG, "Non pointer structure/union argument is not supported."),\ 543 C(BAD_HYPHEN, "Failed to parse single hyphen. Forgot '>'?"), \ 544 C(NO_BTF_FIELD, "This field is not found."), \ 545 C(BAD_BTF_TID, "Failed to get BTF type info."),\ 546 C(BAD_TYPE4STR, "This type does not fit for string."),\ 547 C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"), 548 549 #undef C 550 #define C(a, b) TP_ERR_##a 551 552 /* Define TP_ERR_ */ 553 enum { ERRORS }; 554 555 /* Error text is defined in trace_probe.c */ 556 557 struct trace_probe_log { 558 const char *subsystem; 559 const char **argv; 560 int argc; 561 int index; 562 }; 563 564 void trace_probe_log_init(const char *subsystem, int argc, const char **argv); 565 void trace_probe_log_set_index(int index); 566 void trace_probe_log_clear(void); 567 void __trace_probe_log_err(int offset, int err); 568 569 #define trace_probe_log_err(offs, err) \ 570 __trace_probe_log_err(offs, TP_ERR_##err) 571 572 struct uprobe_dispatch_data { 573 struct trace_uprobe *tu; 574 unsigned long bp_addr; 575 }; 576