kernel/trace/trace_probe.h

   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
  68 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
  69 {
  70         return (u8 *)ent + get_loc_offs(*dl);
  71 }
  72
  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
 216 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
 217 {
 218         return false;
 219 }
 220
 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
 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
 279 static inline void trace_probe_set_flag(struct trace_probe *tp,
 280                                         unsigned int flag)
 281 {
 282         tp->event->flags |= flag;
 283 }
 284
 285 static inline void trace_probe_clear_flag(struct trace_probe *tp,
 286                                           unsigned int flag)
 287 {
 288         tp->event->flags &= ~flag;
 289 }
 290
 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
 296 static inline const char *trace_probe_name(struct trace_probe *tp)
 297 {
 298         return trace_event_name(&tp->event->call);
 299 }
 300
 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 *
 307         trace_probe_event_call(struct trace_probe *tp)
 308 {
 309         return &tp->event->call;
 310 }
 311
 312 static inline struct trace_probe_event *
 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 *
 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
 326 static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
 327 {
 328         return &tp->event->probes;
 329 }
 330
 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
 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
 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 */
 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
 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
 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 };