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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 <asm/bitsperlong.h>
27
28#include "trace.h"
29#include "trace_output.h"
30
31#define MAX_TRACE_ARGS 128
32#define MAX_ARGSTR_LEN 63
33#define MAX_ARRAY_LEN 64
34#define MAX_ARG_NAME_LEN 32
35#define MAX_STRING_SIZE PATH_MAX
36
37
38#define FIELD_STRING_IP "__probe_ip"
39#define FIELD_STRING_RETIP "__probe_ret_ip"
40#define FIELD_STRING_FUNC "__probe_func"
41
42#undef DEFINE_FIELD
43#define DEFINE_FIELD(type, item, name, is_signed) \
44 do { \
45 ret = trace_define_field(event_call, #type, name, \
46 offsetof(typeof(field), item), \
47 sizeof(field.item), is_signed, \
48 FILTER_OTHER); \
49 if (ret) \
50 return ret; \
51 } while (0)
52
53
54
55#define TP_FLAG_TRACE 1
56#define TP_FLAG_PROFILE 2
57
58
59#define make_data_loc(len, offs) \
60 (((u32)(len) << 16) | ((u32)(offs) & 0xffff))
61#define get_loc_len(dl) ((u32)(dl) >> 16)
62#define get_loc_offs(dl) ((u32)(dl) & 0xffff)
63
64static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
65{
66 return (u8 *)ent + get_loc_offs(*dl);
67}
68
69static nokprobe_inline u32 update_data_loc(u32 loc, int consumed)
70{
71 u32 maxlen = get_loc_len(loc);
72 u32 offset = get_loc_offs(loc);
73
74 return make_data_loc(maxlen - consumed, offset + consumed);
75}
76
77
78typedef int (*print_type_func_t)(struct trace_seq *, void *, void *);
79
80enum fetch_op {
81 FETCH_OP_NOP = 0,
82
83 FETCH_OP_REG,
84 FETCH_OP_STACK,
85 FETCH_OP_STACKP,
86 FETCH_OP_RETVAL,
87 FETCH_OP_IMM,
88 FETCH_OP_COMM,
89 FETCH_OP_ARG,
90 FETCH_OP_FOFFS,
91 FETCH_OP_DATA,
92
93 FETCH_OP_DEREF,
94 FETCH_OP_UDEREF,
95
96 FETCH_OP_ST_RAW,
97 FETCH_OP_ST_MEM,
98 FETCH_OP_ST_UMEM,
99 FETCH_OP_ST_STRING,
100 FETCH_OP_ST_USTRING,
101
102 FETCH_OP_MOD_BF,
103
104 FETCH_OP_LP_ARRAY,
105 FETCH_OP_END,
106 FETCH_NOP_SYMBOL,
107};
108
109struct fetch_insn {
110 enum fetch_op op;
111 union {
112 unsigned int param;
113 struct {
114 unsigned int size;
115 int offset;
116 };
117 struct {
118 unsigned char basesize;
119 unsigned char lshift;
120 unsigned char rshift;
121 };
122 unsigned long immediate;
123 void *data;
124 };
125};
126
127
128#define FETCH_INSN_MAX 16
129#define FETCH_TOKEN_COMM (-ECOMM)
130
131
132struct fetch_type {
133 const char *name;
134 size_t size;
135 int is_signed;
136 print_type_func_t print;
137 const char *fmt;
138 const char *fmttype;
139};
140
141
142typedef u32 string;
143typedef u32 string_size;
144
145#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
146#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
147
148
149#define DECLARE_BASIC_PRINT_TYPE_FUNC(type) \
150int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s, void *data, void *ent);\
151extern const char PRINT_TYPE_FMT_NAME(type)[]
152
153DECLARE_BASIC_PRINT_TYPE_FUNC(u8);
154DECLARE_BASIC_PRINT_TYPE_FUNC(u16);
155DECLARE_BASIC_PRINT_TYPE_FUNC(u32);
156DECLARE_BASIC_PRINT_TYPE_FUNC(u64);
157DECLARE_BASIC_PRINT_TYPE_FUNC(s8);
158DECLARE_BASIC_PRINT_TYPE_FUNC(s16);
159DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
160DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
161DECLARE_BASIC_PRINT_TYPE_FUNC(x8);
162DECLARE_BASIC_PRINT_TYPE_FUNC(x16);
163DECLARE_BASIC_PRINT_TYPE_FUNC(x32);
164DECLARE_BASIC_PRINT_TYPE_FUNC(x64);
165
166DECLARE_BASIC_PRINT_TYPE_FUNC(string);
167DECLARE_BASIC_PRINT_TYPE_FUNC(symbol);
168
169
170#define __DEFAULT_FETCH_TYPE(t) x##t
171#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
172#define DEFAULT_FETCH_TYPE _DEFAULT_FETCH_TYPE(BITS_PER_LONG)
173#define DEFAULT_FETCH_TYPE_STR __stringify(DEFAULT_FETCH_TYPE)
174
175#define __ADDR_FETCH_TYPE(t) u##t
176#define _ADDR_FETCH_TYPE(t) __ADDR_FETCH_TYPE(t)
177#define ADDR_FETCH_TYPE _ADDR_FETCH_TYPE(BITS_PER_LONG)
178
179#define __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
180 {.name = _name, \
181 .size = _size, \
182 .is_signed = sign, \
183 .print = PRINT_TYPE_FUNC_NAME(ptype), \
184 .fmt = PRINT_TYPE_FMT_NAME(ptype), \
185 .fmttype = _fmttype, \
186 }
187#define _ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, _fmttype) \
188 __ASSIGN_FETCH_TYPE(_name, ptype, ftype, _size, sign, #_fmttype)
189#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
190 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, ptype)
191
192
193#define ASSIGN_FETCH_TYPE_ALIAS(ptype, atype, ftype, sign) \
194 _ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, atype)
195
196#define ASSIGN_FETCH_TYPE_END {}
197#define MAX_ARRAY_LEN 64
198
199#ifdef CONFIG_KPROBE_EVENTS
200bool trace_kprobe_on_func_entry(struct trace_event_call *call);
201bool trace_kprobe_error_injectable(struct trace_event_call *call);
202#else
203static inline bool trace_kprobe_on_func_entry(struct trace_event_call *call)
204{
205 return false;
206}
207
208static inline bool trace_kprobe_error_injectable(struct trace_event_call *call)
209{
210 return false;
211}
212#endif
213
214struct probe_arg {
215 struct fetch_insn *code;
216 bool dynamic;
217 unsigned int offset;
218 unsigned int count;
219 const char *name;
220 const char *comm;
221 char *fmt;
222 const struct fetch_type *type;
223};
224
225struct trace_uprobe_filter {
226 rwlock_t rwlock;
227 int nr_systemwide;
228 struct list_head perf_events;
229};
230
231
232struct trace_probe_event {
233 unsigned int flags;
234 struct trace_event_class class;
235 struct trace_event_call call;
236 struct list_head files;
237 struct list_head probes;
238 struct trace_uprobe_filter filter[];
239};
240
241struct trace_probe {
242 struct list_head list;
243 struct trace_probe_event *event;
244 ssize_t size;
245 unsigned int nr_args;
246 struct probe_arg args[];
247};
248
249struct event_file_link {
250 struct trace_event_file *file;
251 struct list_head list;
252};
253
254static inline bool trace_probe_test_flag(struct trace_probe *tp,
255 unsigned int flag)
256{
257 return !!(tp->event->flags & flag);
258}
259
260static inline void trace_probe_set_flag(struct trace_probe *tp,
261 unsigned int flag)
262{
263 tp->event->flags |= flag;
264}
265
266static inline void trace_probe_clear_flag(struct trace_probe *tp,
267 unsigned int flag)
268{
269 tp->event->flags &= ~flag;
270}
271
272static inline bool trace_probe_is_enabled(struct trace_probe *tp)
273{
274 return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE);
275}
276
277static inline const char *trace_probe_name(struct trace_probe *tp)
278{
279 return trace_event_name(&tp->event->call);
280}
281
282static inline const char *trace_probe_group_name(struct trace_probe *tp)
283{
284 return tp->event->call.class->system;
285}
286
287static inline struct trace_event_call *
288 trace_probe_event_call(struct trace_probe *tp)
289{
290 return &tp->event->call;
291}
292
293static inline struct trace_probe_event *
294trace_probe_event_from_call(struct trace_event_call *event_call)
295{
296 return container_of(event_call, struct trace_probe_event, call);
297}
298
299static inline struct trace_probe *
300trace_probe_primary_from_call(struct trace_event_call *call)
301{
302 struct trace_probe_event *tpe = trace_probe_event_from_call(call);
303
304 return list_first_entry(&tpe->probes, struct trace_probe, list);
305}
306
307static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp)
308{
309 return &tp->event->probes;
310}
311
312static inline bool trace_probe_has_sibling(struct trace_probe *tp)
313{
314 struct list_head *list = trace_probe_probe_list(tp);
315
316 return !list_empty(list) && !list_is_singular(list);
317}
318
319static inline int trace_probe_unregister_event_call(struct trace_probe *tp)
320{
321
322 return trace_remove_event_call(&tp->event->call);
323}
324
325static inline bool trace_probe_has_single_file(struct trace_probe *tp)
326{
327 return !!list_is_singular(&tp->event->files);
328}
329
330int trace_probe_init(struct trace_probe *tp, const char *event,
331 const char *group, bool alloc_filter);
332void trace_probe_cleanup(struct trace_probe *tp);
333int trace_probe_append(struct trace_probe *tp, struct trace_probe *to);
334void trace_probe_unlink(struct trace_probe *tp);
335int trace_probe_register_event_call(struct trace_probe *tp);
336int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file);
337int trace_probe_remove_file(struct trace_probe *tp,
338 struct trace_event_file *file);
339struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
340 struct trace_event_file *file);
341int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b);
342bool trace_probe_match_command_args(struct trace_probe *tp,
343 int argc, const char **argv);
344int trace_probe_create(const char *raw_command, int (*createfn)(int, const char **));
345
346#define trace_probe_for_each_link(pos, tp) \
347 list_for_each_entry(pos, &(tp)->event->files, list)
348#define trace_probe_for_each_link_rcu(pos, tp) \
349 list_for_each_entry_rcu(pos, &(tp)->event->files, list)
350
351#define TPARG_FL_RETURN BIT(0)
352#define TPARG_FL_KERNEL BIT(1)
353#define TPARG_FL_FENTRY BIT(2)
354#define TPARG_FL_MASK GENMASK(2, 0)
355
356extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
357 char *arg, unsigned int flags);
358
359extern int traceprobe_update_arg(struct probe_arg *arg);
360extern void traceprobe_free_probe_arg(struct probe_arg *arg);
361
362extern int traceprobe_split_symbol_offset(char *symbol, long *offset);
363int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
364 char *buf, int offset);
365
366extern int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return);
367
368#ifdef CONFIG_PERF_EVENTS
369extern struct trace_event_call *
370create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
371 bool is_return);
372extern void destroy_local_trace_kprobe(struct trace_event_call *event_call);
373
374extern struct trace_event_call *
375create_local_trace_uprobe(char *name, unsigned long offs,
376 unsigned long ref_ctr_offset, bool is_return);
377extern void destroy_local_trace_uprobe(struct trace_event_call *event_call);
378#endif
379extern int traceprobe_define_arg_fields(struct trace_event_call *event_call,
380 size_t offset, struct trace_probe *tp);
381
382#undef ERRORS
383#define ERRORS \
384 C(FILE_NOT_FOUND, "Failed to find the given file"), \
385 C(NO_REGULAR_FILE, "Not a regular file"), \
386 C(BAD_REFCNT, "Invalid reference counter offset"), \
387 C(REFCNT_OPEN_BRACE, "Reference counter brace is not closed"), \
388 C(BAD_REFCNT_SUFFIX, "Reference counter has wrong suffix"), \
389 C(BAD_UPROBE_OFFS, "Invalid uprobe offset"), \
390 C(MAXACT_NO_KPROBE, "Maxactive is not for kprobe"), \
391 C(BAD_MAXACT, "Invalid maxactive number"), \
392 C(MAXACT_TOO_BIG, "Maxactive is too big"), \
393 C(BAD_PROBE_ADDR, "Invalid probed address or symbol"), \
394 C(BAD_RETPROBE, "Retprobe address must be an function entry"), \
395 C(BAD_ADDR_SUFFIX, "Invalid probed address suffix"), \
396 C(NO_GROUP_NAME, "Group name is not specified"), \
397 C(GROUP_TOO_LONG, "Group name is too long"), \
398 C(BAD_GROUP_NAME, "Group name must follow the same rules as C identifiers"), \
399 C(NO_EVENT_NAME, "Event name is not specified"), \
400 C(EVENT_TOO_LONG, "Event name is too long"), \
401 C(BAD_EVENT_NAME, "Event name must follow the same rules as C identifiers"), \
402 C(RETVAL_ON_PROBE, "$retval is not available on probe"), \
403 C(BAD_STACK_NUM, "Invalid stack number"), \
404 C(BAD_ARG_NUM, "Invalid argument number"), \
405 C(BAD_VAR, "Invalid $-valiable specified"), \
406 C(BAD_REG_NAME, "Invalid register name"), \
407 C(BAD_MEM_ADDR, "Invalid memory address"), \
408 C(BAD_IMM, "Invalid immediate value"), \
409 C(IMMSTR_NO_CLOSE, "String is not closed with '\"'"), \
410 C(FILE_ON_KPROBE, "File offset is not available with kprobe"), \
411 C(BAD_FILE_OFFS, "Invalid file offset value"), \
412 C(SYM_ON_UPROBE, "Symbol is not available with uprobe"), \
413 C(TOO_MANY_OPS, "Dereference is too much nested"), \
414 C(DEREF_NEED_BRACE, "Dereference needs a brace"), \
415 C(BAD_DEREF_OFFS, "Invalid dereference offset"), \
416 C(DEREF_OPEN_BRACE, "Dereference brace is not closed"), \
417 C(COMM_CANT_DEREF, "$comm can not be dereferenced"), \
418 C(BAD_FETCH_ARG, "Invalid fetch argument"), \
419 C(ARRAY_NO_CLOSE, "Array is not closed"), \
420 C(BAD_ARRAY_SUFFIX, "Array has wrong suffix"), \
421 C(BAD_ARRAY_NUM, "Invalid array size"), \
422 C(ARRAY_TOO_BIG, "Array number is too big"), \
423 C(BAD_TYPE, "Unknown type is specified"), \
424 C(BAD_STRING, "String accepts only memory argument"), \
425 C(BAD_BITFIELD, "Invalid bitfield"), \
426 C(ARG_NAME_TOO_LONG, "Argument name is too long"), \
427 C(NO_ARG_NAME, "Argument name is not specified"), \
428 C(BAD_ARG_NAME, "Argument name must follow the same rules as C identifiers"), \
429 C(USED_ARG_NAME, "This argument name is already used"), \
430 C(ARG_TOO_LONG, "Argument expression is too long"), \
431 C(NO_ARG_BODY, "No argument expression"), \
432 C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\
433 C(FAIL_REG_PROBE, "Failed to register probe event"),\
434 C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"),\
435 C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"),\
436 C(SAME_PROBE, "There is already the exact same probe event"),
437
438#undef C
439#define C(a, b) TP_ERR_##a
440
441
442enum { ERRORS };
443
444
445
446struct trace_probe_log {
447 const char *subsystem;
448 const char **argv;
449 int argc;
450 int index;
451};
452
453void trace_probe_log_init(const char *subsystem, int argc, const char **argv);
454void trace_probe_log_set_index(int index);
455void trace_probe_log_clear(void);
456void __trace_probe_log_err(int offset, int err);
457
458#define trace_probe_log_err(offs, err) \
459 __trace_probe_log_err(offs, TP_ERR_##err)
460
