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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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#define MAX_PROBE_EVENT_SIZE 3072
/* 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_EVENTSbool trace_kprobe_on_func_entry(struct trace_event_call *call);bool trace_kprobe_error_injectable(struct trace_event_call *call);#elsestatic 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 { unsigned int size; /* The entry data size */ struct fetch_insn code[] __counted_by(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_APIint 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 */ struct btf *struct_btf; /* The BTF to be used for structs */ const struct btf_type *last_type; /* Saved type */ const struct btf_type *last_struct; /* Saved structure */ 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_EVENTSextern 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);#endifextern 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 $-variable specified"), \ C(BAD_REG_NAME, "Invalid register name"), \ C(BAD_MEM_ADDR, "Invalid memory address"), \ C(BAD_IMM, "Invalid immediate value"), \ C(IMMSTR_NO_CLOSE, "String is not closed with '\"'"), \ C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \ C(BAD_FILE_OFFS, "Invalid file offset value"), \ C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \ C(TOO_MANY_OPS, "Dereference is too much nested"), \ C(DEREF_NEED_BRACE, "Dereference needs a brace"), \ C(BAD_DEREF_OFFS, "Invalid dereference offset"), \ C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \ C(COMM_CANT_DEREF, "$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"), \ C(EVENT_TOO_BIG, "Event too big (too many fields?)"), \ C(TYPECAST_NOT_EVENT, "Typecasts are only for eprobe fields"),
#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;};