// SPDX-License-Identifier: GPL-2.0
/*
 * Common header file for probe-based Dynamic events.
 *
 * This code was copied from kernel/trace/trace_kprobe.h written by
 * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
 *
 * Updates to make this generic:
 * Copyright (C) IBM Corporation, 2010-2011
 * Author:     Srikar Dronamraju
 */

#include <linux/bitops.h>
#include <linux/btf.h>
#include <linux/cleanup.h>
#include <linux/kprobes.h>
#include <linux/limits.h>
#include <linux/perf_event.h>
#include <linux/ptrace.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include <linux/tracefs.h>
#include <linux/types.h>
#include <linux/uaccess.h>

#include <asm/bitsperlong.h>

#include "trace.h"
#include "trace_output.h"

#define MAX_TRACE_ARGS          128
#define MAX_ARGSTR_LEN          63
#define MAX_ARRAY_LEN           64
#define MAX_ARG_NAME_LEN        32
#define MAX_BTF_ARGS_LEN        128
#define MAX_DENTRY_ARGS_LEN     256
#define MAX_STRING_SIZE         PATH_MAX

/* Reserved field names */
#define FIELD_STRING_IP         "__probe_ip"
#define FIELD_STRING_RETIP      "__probe_ret_ip"
#define FIELD_STRING_FUNC       "__probe_func"

#undef DEFINE_FIELD
#define DEFINE_FIELD(type, item, name, is_signed)                       \
        do {                                                            \
                ret = trace_define_field(event_call, #type, name,       \
                                         offsetof(typeof(field), item), \
                                         sizeof(field.item), is_signed, \
                                         FILTER_OTHER);                 \
                if (ret)                                                \
                        return ret;                                     \
        } while (0)


/* Flags for trace_probe */
#define TP_FLAG_TRACE           1
#define TP_FLAG_PROFILE         2

/* data_loc: data location, compatible with u32 */
#define make_data_loc(len, offs)        \
        (((u32)(len) << 16) | ((u32)(offs) & 0xffff))
#define get_loc_len(dl)         ((u32)(dl) >> 16)
#define get_loc_offs(dl)        ((u32)(dl) & 0xffff)

static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
{
        return (u8 *)ent + get_loc_offs(*dl);
}

static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
{
        u32 maxlen = get_loc_len(loc);
        u32 offset = get_loc_offs(loc);

        return make_data_loc(maxlen - consumed, offset + consumed);
}

/* Printing function type */
typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);

enum fetch_op {
        FETCH_OP_NOP = 0,
        // Stage 1 (load) ops
        FETCH_OP_REG,           /* Register : .param = offset */
        FETCH_OP_STACK,         /* Stack : .param = index */
        FETCH_OP_STACKP,        /* Stack pointer */
        FETCH_OP_RETVAL,        /* Return value */
        FETCH_OP_IMM,           /* Immediate : .immediate */
        FETCH_OP_COMM,          /* Current comm */
        FETCH_OP_ARG,           /* Function argument : .param */
        FETCH_OP_FOFFS,         /* File offset: .immediate */
        FETCH_OP_DATA,          /* Allocated data: .data */
        FETCH_OP_EDATA,         /* Entry data: .offset */
        // Stage 2 (dereference) op
        FETCH_OP_DEREF,         /* Dereference: .offset */
        FETCH_OP_UDEREF,        /* User-space Dereference: .offset */
        // Stage 3 (store) ops
        FETCH_OP_ST_RAW,        /* Raw: .size */
        FETCH_OP_ST_MEM,        /* Mem: .offset, .size */
        FETCH_OP_ST_UMEM,       /* Mem: .offset, .size */
        FETCH_OP_ST_STRING,     /* String: .offset, .size */
        FETCH_OP_ST_USTRING,    /* User String: .offset, .size */
        FETCH_OP_ST_SYMSTR,     /* Kernel Symbol String: .offset, .size */
        FETCH_OP_ST_EDATA,      /* Store Entry Data: .offset */
        // Stage 4 (modify) op
        FETCH_OP_MOD_BF,        /* Bitfield: .basesize, .lshift, .rshift */
        // Stage 5 (loop) op
        FETCH_OP_LP_ARRAY,      /* Array: .param = loop count */
        FETCH_OP_TP_ARG,        /* Trace Point argument */
        FETCH_OP_END,
        FETCH_NOP_SYMBOL,       /* Unresolved Symbol holder */
};

struct fetch_insn {
        enum fetch_op op;
        union {
                unsigned int param;
                struct {
                        unsigned int size;
                        int offset;
                };
                struct {
                        unsigned char basesize;
                        unsigned char lshift;
                        unsigned char rshift;
                };
                unsigned long immediate;
                void *data;
        };
};

/* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
#define FETCH_INSN_MAX  16
#define FETCH_TOKEN_COMM        (-ECOMM)

/* Fetch type information table */
struct fetch_type {
        const char              *name;          /* Name of type */
        size_t                  size;           /* Byte size of type */
        bool                    is_signed;      /* Signed flag */
        bool                    is_string;      /* String flag */
        print_type_func_t       print;          /* Print functions */
        const char              *fmt;           /* Format string */
        const char              *fmttype;       /* Name in format file */
};

/* For defining macros, define string/string_size types */
typedef u32 string;
typedef u32 string_size;

#define PRINT_TYPE_FUNC_NAME(type)      print_type_##type
#define PRINT_TYPE_FMT_NAME(type)       print_type_format_##type

/* Printing  in basic type function template */
#define DECLARE_BASIC_PRINT_TYPE_FUNC(type)                             \
int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
extern const char PRINT_TYPE_FMT_NAME(type)[]

DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
DECLARE_BASIC_PRINT_TYPE_FUNC(x64);

DECLARE_BASIC_PRINT_TYPE_FUNC(char);
DECLARE_BASIC_PRINT_TYPE_FUNC(string);
DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);

/* Default (unsigned long) fetch type */
#define __DEFAULT_FETCH_TYPE(t) x##t
#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)

#define __ADDR_FETCH_TYPE(t) u##t
#define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
#define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)

#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, str, _fmttype)    \
        {.name = _name,                                 \
         .size = _size,                                 \
         .is_signed = (bool)sign,                       \
         .is_string = (bool)str,                        \
         .print = PRINT_TYPE_FUNC_NAME(ptype),          \
         .fmt = PRINT_TYPE_FMT_NAME(ptype),             \
         .fmttype = _fmttype,                           \
        }

/* Non string types can use these macros */
#define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype)  \
        __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, 0, #_fmttype)
#define ASSIGN_FETCH_TYPE(ptype, ftype, sign)                   \
        _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)

/* If ptype is an alias of atype, use this macro (show atype in format) */
#define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign)              \
        _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)

#define ASSIGN_FETCH_TYPE_END {}
#define MAX_ARRAY_LEN   64

#ifdef CONFIG_KPROBE_EVENTS
bool trace_kprobe_on_func_entry(struct trace_event_call *call);
bool trace_kprobe_error_injectable(struct trace_event_call *call);
#else
static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
{
        return false;
}

static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
{
        return false;
}
#endif /* CONFIG_KPROBE_EVENTS */

struct probe_arg {
        struct fetch_insn       *code;
        bool                    dynamic;/* Dynamic array (string) is used */
        unsigned int            offset; /* Offset from argument entry */
        unsigned int            count;  /* Array count */
        const char              *name;  /* Name of this argument */
        const char              *comm;  /* Command of this argument */
        char                    *fmt;   /* Format string if needed */
        const struct fetch_type *type;  /* Type of this argument */
};

struct probe_entry_arg {
        struct fetch_insn       *code;
        unsigned int            size;   /* The entry data size */
};

struct trace_uprobe_filter {
        rwlock_t                rwlock;
        int                     nr_systemwide;
        struct list_head        perf_events;
};

/* Event call and class holder */
struct trace_probe_event {
        unsigned int                    flags;  /* For TP_FLAG_* */
        struct trace_event_class        class;
        struct trace_event_call         call;
        struct list_head                files;
        struct list_head                probes;
        struct trace_uprobe_filter      filter[];
};

struct trace_probe {
        struct list_head                list;
        struct trace_probe_event        *event;
        ssize_t                         size;   /* trace entry size */
        unsigned int                    nr_args;
        struct probe_entry_arg          *entry_arg;     /* This is only for return probe */
        struct probe_arg                args[];
};

struct event_file_link {
        struct trace_event_file         *file;
        struct list_head                list;
};

static inline unsigned int trace_probe_load_flag(struct trace_probe *tp)
{
        return smp_load_acquire(&tp->event->flags);
}

static inline bool trace_probe_test_flag(struct trace_probe *tp,
                                         unsigned int flag)
{
        return !!(trace_probe_load_flag(tp) & flag);
}

static inline void trace_probe_set_flag(struct trace_probe *tp,
                                        unsigned int flag)
{
        smp_store_release(&tp->event->flags, tp->event->flags | flag);
}

static inline void trace_probe_clear_flag(struct trace_probe *tp,
                                          unsigned int flag)
{
        tp->event->flags &= ~flag;
}

static inline bool trace_probe_is_enabled(struct trace_probe *tp)
{
        return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE);
}

static inline const char *trace_probe_name(struct trace_probe *tp)
{
        return trace_event_name(&tp->event->call);
}

static inline const char *trace_probe_group_name(struct trace_probe *tp)
{
        return tp->event->call.class->system;
}

static inline struct trace_event_call *
        trace_probe_event_call(struct trace_probe *tp)
{
        return &tp->event->call;
}

static inline struct trace_probe_event *
trace_probe_event_from_call(struct trace_event_call *event_call)
{
        return container_of(event_call, struct trace_probe_event, call);
}

static inline struct trace_probe *
trace_probe_primary_from_call(struct trace_event_call *call)
{
        struct trace_probe_event *tpe = trace_probe_event_from_call(call);

        return list_first_entry_or_null(&tpe->probes, struct trace_probe, list);
}

static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
{
        return &tp->event->probes;
}

static inline bool trace_probe_has_sibling(struct trace_probe *tp)
{
        struct list_head *list = trace_probe_probe_list(tp);

        return !list_empty(list) && !list_is_singular(list);
}

static inline int trace_probe_unregister_event_call(struct trace_probe *tp)
{
        /* tp->event is unregistered in trace_remove_event_call() */
        return trace_remove_event_call(&tp->event->call);
}

static inline bool trace_probe_has_single_file(struct trace_probe *tp)
{
        return !!list_is_singular(&tp->event->files);
}

int trace_probe_init(struct trace_probe *tp, const char *event,
                     const char *group, bool alloc_filter, int nargs);
void trace_probe_cleanup(struct trace_probe *tp);
int trace_probe_append(struct trace_probe *tp, struct trace_probe *to);
void trace_probe_unlink(struct trace_probe *tp);
int trace_probe_register_event_call(struct trace_probe *tp);
int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file);
int trace_probe_remove_file(struct trace_probe *tp,
                            struct trace_event_file *file);
struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
                                                struct trace_event_file *file);
int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b);
bool trace_probe_match_command_args(struct trace_probe *tp,
                                    int argc, const char **argv);
int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **));
int trace_probe_print_args(struct trace_seq *s, struct probe_arg *args, int nr_args,
                 u8 *data, void *field);

#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
int traceprobe_get_entry_data_size(struct trace_probe *tp);
/* This is a runtime function to store entry data */
void store_trace_entry_data(void *edata, struct trace_probe *tp, struct pt_regs *regs);
#else /* !CONFIG_HAVE_FUNCTION_ARG_ACCESS_API */
static inline int traceprobe_get_entry_data_size(struct trace_probe *tp)
{
        return 0;
}
#define store_trace_entry_data(edata, tp, regs) do { } while (0)
#endif

#define trace_probe_for_each_link(pos, tp)      \
        list_for_each_entry(pos, &(tp)->event->files, list)
#define trace_probe_for_each_link_rcu(pos, tp)  \
        list_for_each_entry_rcu(pos, &(tp)->event->files, list)

/*
 * The flags used for parsing trace_probe arguments.
 * TPARG_FL_RETURN, TPARG_FL_FENTRY and TPARG_FL_TEVENT are mutually exclusive.
 * TPARG_FL_KERNEL and TPARG_FL_USER are also mutually exclusive.
 * TPARG_FL_FPROBE and TPARG_FL_TPOINT are optional but it should be with
 * TPARG_FL_KERNEL.
 */
#define TPARG_FL_RETURN BIT(0)
#define TPARG_FL_KERNEL BIT(1)
#define TPARG_FL_FENTRY BIT(2)
#define TPARG_FL_TEVENT BIT(3)
#define TPARG_FL_USER   BIT(4)
#define TPARG_FL_FPROBE BIT(5)
#define TPARG_FL_TPOINT BIT(6)
#define TPARG_FL_LOC_MASK       GENMASK(4, 0)

static inline bool tparg_is_function_entry(unsigned int flags)
{
        return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_FENTRY);
}

static inline bool tparg_is_function_return(unsigned int flags)
{
        return (flags & TPARG_FL_LOC_MASK) == (TPARG_FL_KERNEL | TPARG_FL_RETURN);
}

struct traceprobe_parse_context {
        struct trace_event_call *event;
        /* BTF related parameters */
        const char *funcname;           /* Function name in BTF */
        const struct btf_type  *proto;  /* Prototype of the function */
        const struct btf_param *params; /* Parameter of the function */
        s32 nr_params;                  /* The number of the parameters */
        struct btf *btf;                /* The BTF to be used */
        const struct btf_type *last_type;       /* Saved type */
        u32 last_bitoffs;               /* Saved bitoffs */
        u32 last_bitsize;               /* Saved bitsize */
        struct trace_probe *tp;
        unsigned int flags;
        int offset;
};

extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
                                      const char *argv,
                                      struct traceprobe_parse_context *ctx);
const char **traceprobe_expand_meta_args(int argc, const char *argv[],
                                         int *new_argc, char *buf, int bufsize,
                                         struct traceprobe_parse_context *ctx);
extern int traceprobe_expand_dentry_args(int argc, const char *argv[], char **buf);

extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);

/*
 * If either traceprobe_parse_probe_arg() or traceprobe_expand_meta_args() is called,
 * this MUST be called for clean up the context and return a resource.
 */
void traceprobe_finish_parse(struct traceprobe_parse_context *ctx);
static inline void traceprobe_free_parse_ctx(struct traceprobe_parse_context *ctx)
{
        traceprobe_finish_parse(ctx);
        kfree(ctx);
}

DEFINE_FREE(traceprobe_parse_context, struct traceprobe_parse_context *,
        if (_T) traceprobe_free_parse_ctx(_T))

extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
                                char *buf, int offset);

enum probe_print_type {
        PROBE_PRINT_NORMAL,
        PROBE_PRINT_RETURN,
        PROBE_PRINT_EVENT,
};

extern int traceprobe_set_print_fmt(struct trace_probe *tp, enum probe_print_type ptype);

#ifdef CONFIG_PERF_EVENTS
extern struct trace_event_call *
create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
                          bool is_return);
extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);

extern struct trace_event_call *
create_local_trace_uprobe(char *name, unsigned long offs,
                          unsigned long ref_ctr_offset, bool is_return);
extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
#endif
extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
                                        size_t offset, struct trace_probe *tp);

#undef ERRORS
#define ERRORS  \
        C(FILE_NOT_FOUND,       "Failed to find the given file"),       \
        C(NO_REGULAR_FILE,      "Not a regular file"),                  \
        C(BAD_REFCNT,           "Invalid reference counter offset"),    \
        C(REFCNT_OPEN_BRACE,    "Reference counter brace is not closed"), \
        C(BAD_REFCNT_SUFFIX,    "Reference counter has wrong suffix"),  \
        C(BAD_UPROBE_OFFS,      "Invalid uprobe offset"),               \
        C(BAD_MAXACT_TYPE,      "Maxactive is only for function exit"), \
        C(BAD_MAXACT,           "Invalid maxactive number"),            \
        C(MAXACT_TOO_BIG,       "Maxactive is too big"),                \
        C(BAD_PROBE_ADDR,       "Invalid probed address or symbol"),    \
        C(NON_UNIQ_SYMBOL,      "The symbol is not unique"),            \
        C(BAD_RETPROBE,         "Retprobe address must be an function entry"), \
        C(NO_TRACEPOINT,        "Tracepoint is not found"),             \
        C(BAD_TP_NAME,          "Invalid character in tracepoint name"),\
        C(BAD_ADDR_SUFFIX,      "Invalid probed address suffix"), \
        C(NO_GROUP_NAME,        "Group name is not specified"),         \
        C(GROUP_TOO_LONG,       "Group name is too long"),              \
        C(BAD_GROUP_NAME,       "Group name must follow the same rules as C identifiers"), \
        C(NO_EVENT_NAME,        "Event name is not specified"),         \
        C(EVENT_TOO_LONG,       "Event name is too long"),              \
        C(BAD_EVENT_NAME,       "Event name must follow the same rules as C identifiers"), \
        C(EVENT_EXIST,          "Given group/event name is already used by another event"), \
        C(RETVAL_ON_PROBE,      "$retval is not available on probe"),   \
        C(NO_RETVAL,            "This function returns 'void' type"),   \
        C(BAD_STACK_NUM,        "Invalid stack number"),                \
        C(BAD_ARG_NUM,          "Invalid argument number"),             \
        C(BAD_VAR,              "Invalid $-valiable specified"),        \
        C(BAD_REG_NAME,         "Invalid register name"),               \
        C(BAD_MEM_ADDR,         "Invalid memory address"),              \
        C(BAD_IMM,              "Invalid immediate value"),             \
        C(IMMSTR_NO_CLOSE,      "String is not closed with '\"'"),      \
        C(FILE_ON_KPROBE,       "File offset is not available with kprobe"), \
        C(BAD_FILE_OFFS,        "Invalid file offset value"),           \
        C(SYM_ON_UPROBE,        "Symbol is not available with uprobe"), \
        C(TOO_MANY_OPS,         "Dereference is too much nested"),      \
        C(DEREF_NEED_BRACE,     "Dereference needs a brace"),           \
        C(BAD_DEREF_OFFS,       "Invalid dereference offset"),          \
        C(DEREF_OPEN_BRACE,     "Dereference brace is not closed"),     \
        C(COMM_CANT_DEREF,      "$comm can not be dereferenced"),       \
        C(BAD_FETCH_ARG,        "Invalid fetch argument"),              \
        C(ARRAY_NO_CLOSE,       "Array is not closed"),                 \
        C(BAD_ARRAY_SUFFIX,     "Array has wrong suffix"),              \
        C(BAD_ARRAY_NUM,        "Invalid array size"),                  \
        C(ARRAY_TOO_BIG,        "Array number is too big"),             \
        C(BAD_TYPE,             "Unknown type is specified"),           \
        C(BAD_STRING,           "String accepts only memory argument"), \
        C(BAD_SYMSTRING,        "Symbol String doesn't accept data/userdata"),  \
        C(BAD_BITFIELD,         "Invalid bitfield"),                    \
        C(ARG_NAME_TOO_LONG,    "Argument name is too long"),           \
        C(NO_ARG_NAME,          "Argument name is not specified"),      \
        C(BAD_ARG_NAME,         "Argument name must follow the same rules as C identifiers"), \
        C(USED_ARG_NAME,        "This argument name is already used"),  \
        C(ARG_TOO_LONG,         "Argument expression is too long"),     \
        C(NO_ARG_BODY,          "No argument expression"),              \
        C(BAD_INSN_BNDRY,       "Probe point is not an instruction boundary"),\
        C(FAIL_REG_PROBE,       "Failed to register probe event"),\
        C(DIFF_PROBE_TYPE,      "Probe type is different from existing probe"),\
        C(DIFF_ARG_TYPE,        "Argument type or name is different from existing probe"),\
        C(SAME_PROBE,           "There is already the exact same probe event"),\
        C(NO_EVENT_INFO,        "This requires both group and event name to attach"),\
        C(BAD_ATTACH_EVENT,     "Attached event does not exist"),\
        C(BAD_ATTACH_ARG,       "Attached event does not have this field"),\
        C(NO_EP_FILTER,         "No filter rule after 'if'"),           \
        C(NOSUP_BTFARG,         "BTF is not available or not supported"),       \
        C(NO_BTFARG,            "This variable is not found at this probe point"),\
        C(NO_BTF_ENTRY,         "No BTF entry for this probe point"),   \
        C(BAD_VAR_ARGS,         "$arg* must be an independent parameter without name etc."),\
        C(NOFENTRY_ARGS,        "$arg* can be used only on function entry or exit"),    \
        C(DOUBLE_ARGS,          "$arg* can be used only once in the parameters"),       \
        C(ARGS_2LONG,           "$arg* failed because the argument list is too long"),  \
        C(ARGIDX_2BIG,          "$argN index is too big"),              \
        C(NO_PTR_STRCT,         "This is not a pointer to union/structure."),   \
        C(NOSUP_DAT_ARG,        "Non pointer structure/union argument is not supported."),\
        C(BAD_HYPHEN,           "Failed to parse single hyphen. Forgot '>'?"),  \
        C(NO_BTF_FIELD,         "This field is not found."),    \
        C(BAD_BTF_TID,          "Failed to get BTF type info."),\
        C(BAD_TYPE4STR,         "This type does not fit for string."),\
        C(NEED_STRING_TYPE,     "$comm and immediate-string only accepts string type"),\
        C(TOO_MANY_ARGS,        "Too many arguments are specified"),    \
        C(TOO_MANY_EARGS,       "Too many entry arguments specified"),

#undef C
#define C(a, b)         TP_ERR_##a

/* Define TP_ERR_ */
enum { ERRORS };

/* Error text is defined in trace_probe.c */

struct trace_probe_log {
        const char      *subsystem;
        const char      **argv;
        int             argc;
        int             index;
};

const char *trace_probe_log_init(const char *subsystem, int argc, const char **argv);
void trace_probe_log_set_index(int index);
void trace_probe_log_clear(void);
void __trace_probe_log_err(int offset, int err);

DEFINE_FREE(trace_probe_log_clear, const char *, if (_T) trace_probe_log_clear())

#define trace_probe_log_err(offs, err)  \
        __trace_probe_log_err(offs, TP_ERR_##err)

struct uprobe_dispatch_data {
        struct trace_uprobe     *tu;
        unsigned long           bp_addr;
};