1 // SPDX-License-Identifier: GPL-2.0
3 * Common header file for probe-based Dynamic events.
5 * This code was copied from kernel/trace/trace_kprobe.h written by
6 * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
8 * Updates to make this generic:
9 * Copyright (C) IBM Corporation, 2010-2011
10 * Author: Srikar Dronamraju
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/ctype.h>
20 #include <linux/ptrace.h>
21 #include <linux/perf_event.h>
22 #include <linux/kprobes.h>
23 #include <linux/stringify.h>
24 #include <linux/limits.h>
25 #include <linux/uaccess.h>
26 #include <linux/bitops.h>
27 #include <asm/bitsperlong.h>
30 #include "trace_output.h"
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_STRING_SIZE PATH_MAX
38 /* Reserved field names */
39 #define FIELD_STRING_IP "__probe_ip"
40 #define FIELD_STRING_RETIP "__probe_ret_ip"
41 #define FIELD_STRING_FUNC "__probe_func"
44 #define DEFINE_FIELD(type, item, name, is_signed) \
46 ret = trace_define_field(event_call, #type, name, \
47 offsetof(typeof(field), item), \
48 sizeof(field.item), is_signed, \
55 /* Flags for trace_probe */
56 #define TP_FLAG_TRACE 1
57 #define TP_FLAG_PROFILE 2
58 #define TP_FLAG_REGISTERED 4
60 /* data_loc: data location, compatible with u32 */
61 #define make_data_loc(len, offs) \
62 (((u32)(len) << 16) | ((u32)(offs) & 0xffff))
63 #define get_loc_len(dl) ((u32)(dl) >> 16)
64 #define get_loc_offs(dl) ((u32)(dl) & 0xffff)
66 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
68 return (u8 *)ent + get_loc_offs(*dl);
71 static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
73 u32 maxlen = get_loc_len(loc);
74 u32 offset = get_loc_offs(loc);
76 return make_data_loc(maxlen - consumed, offset + consumed);
79 /* Printing function type */
80 typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);
85 FETCH_OP_REG, /* Register : .param = offset */
86 FETCH_OP_STACK, /* Stack : .param = index */
87 FETCH_OP_STACKP, /* Stack pointer */
88 FETCH_OP_RETVAL, /* Return value */
89 FETCH_OP_IMM, /* Immediate : .immediate */
90 FETCH_OP_COMM, /* Current comm */
91 FETCH_OP_ARG, /* Function argument : .param */
92 FETCH_OP_FOFFS, /* File offset: .immediate */
93 // Stage 2 (dereference) op
94 FETCH_OP_DEREF, /* Dereference: .offset */
95 // Stage 3 (store) ops
96 FETCH_OP_ST_RAW, /* Raw: .size */
97 FETCH_OP_ST_MEM, /* Mem: .offset, .size */
98 FETCH_OP_ST_STRING, /* String: .offset, .size */
99 // Stage 4 (modify) op
100 FETCH_OP_MOD_BF, /* Bitfield: .basesize, .lshift, .rshift */
102 FETCH_OP_LP_ARRAY, /* Array: .param = loop count */
104 FETCH_NOP_SYMBOL, /* Unresolved Symbol holder */
116 unsigned char basesize;
117 unsigned char lshift;
118 unsigned char rshift;
120 unsigned long immediate;
125 /* fetch + deref*N + store + mod + end <= 16, this allows N=12, enough */
126 #define FETCH_INSN_MAX 16
128 /* Fetch type information table */
130 const char *name; /* Name of type */
131 size_t size; /* Byte size of type */
132 int is_signed; /* Signed flag */
133 print_type_func_t print; /* Print functions */
134 const char *fmt; /* Fromat string */
135 const char *fmttype; /* Name in format file */
138 /* For defining macros, define string/string_size types */
140 typedef u32 string_size;
142 #define PRINT_TYPE_FUNC_NAME(type) print_type_##type
143 #define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
145 /* Printing in basic type function template */
146 #define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
147 int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
148 extern const char PRINT_TYPE_FMT_NAME(type)[]
150 DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
151 DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
152 DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
153 DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
154 DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
155 DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
156 DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
157 DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
158 DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
159 DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
160 DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
161 DECLARE_BASIC_PRINT_TYPE_FUNC(x64);
163 DECLARE_BASIC_PRINT_TYPE_FUNC(string);
164 DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);
166 /* Default (unsigned long) fetch type */
167 #define __DEFAULT_FETCH_TYPE(t) x##t
168 #define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
169 #define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
170 #define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
172 #define __ADDR_FETCH_TYPE(t) u##t
173 #define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
174 #define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)
176 #define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
180 .print = PRINT_TYPE_FUNC_NAME(ptype), \
181 .fmt = PRINT_TYPE_FMT_NAME(ptype), \
182 .fmttype = _fmttype, \
184 #define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
185 __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, #_fmttype)
186 #define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
187 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)
189 /* If ptype is an alias of atype, use this macro (show atype in format) */
190 #define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign) \
191 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)
193 #define ASSIGN_FETCH_TYPE_END {}
194 #define MAX_ARRAY_LEN 64
196 #ifdef CONFIG_KPROBE_EVENTS
197 bool trace_kprobe_on_func_entry(struct trace_event_call *call);
198 bool trace_kprobe_error_injectable(struct trace_event_call *call);
200 static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
205 static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
209 #endif /* CONFIG_KPROBE_EVENTS */
212 struct fetch_insn *code;
213 bool dynamic;/* Dynamic array (string) is used */
214 unsigned int offset; /* Offset from argument entry */
215 unsigned int count; /* Array count */
216 const char *name; /* Name of this argument */
217 const char *comm; /* Command of this argument */
218 char *fmt; /* Format string if needed */
219 const struct fetch_type *type; /* Type of this argument */
223 unsigned int flags; /* For TP_FLAG_* */
224 struct trace_event_class class;
225 struct trace_event_call call;
226 struct list_head files;
227 ssize_t size; /* trace entry size */
228 unsigned int nr_args;
229 struct probe_arg args[];
232 struct event_file_link {
233 struct trace_event_file *file;
234 struct list_head list;
237 static inline bool trace_probe_is_enabled(struct trace_probe *tp)
239 return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE));
242 static inline bool trace_probe_is_registered(struct trace_probe *tp)
244 return !!(tp->flags & TP_FLAG_REGISTERED);
247 /* Check the name is good for event/group/fields */
248 static inline bool is_good_name(const char *name)
250 if (!isalpha(*name) && *name != '_')
252 while (*++name != '\0') {
253 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
259 static inline struct event_file_link *
260 find_event_file_link(struct trace_probe *tp, struct trace_event_file *file)
262 struct event_file_link *link;
264 list_for_each_entry(link, &tp->files, list)
265 if (link->file == file)
271 #define TPARG_FL_RETURN BIT(0)
272 #define TPARG_FL_KERNEL BIT(1)
273 #define TPARG_FL_FENTRY BIT(2)
274 #define TPARG_FL_MASK GENMASK(2, 0)
276 extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
277 char *arg, unsigned int flags);
279 extern int traceprobe_update_arg(struct probe_arg *arg);
280 extern void traceprobe_free_probe_arg(struct probe_arg *arg);
282 extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
283 extern int traceprobe_parse_event_name(const char **pevent,
284 const char **pgroup, char *buf);
286 extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
288 #ifdef CONFIG_PERF_EVENTS
289 extern struct trace_event_call *
290 create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
292 extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
294 extern struct trace_event_call *
295 create_local_trace_uprobe(char *name, unsigned long offs,
296 unsigned long ref_ctr_offset, bool is_return);
297 extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
299 extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
300 size_t offset, struct trace_probe *tp);