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7951c4eb YQ |
1 | /* Trace file TFILE format support in GDB. |
2 | ||
618f726f | 3 | Copyright (C) 1997-2016 Free Software Foundation, Inc. |
7951c4eb YQ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "tracefile.h" | |
22 | #include "readline/tilde.h" | |
23 | #include "filestuff.h" | |
24 | #include "rsp-low.h" /* bin2hex */ | |
11395323 YQ |
25 | #include "regcache.h" |
26 | #include "inferior.h" | |
27 | #include "gdbthread.h" | |
28 | #include "exec.h" /* exec_bfd */ | |
29 | #include "completer.h" | |
30 | #include "filenames.h" | |
e909d859 | 31 | #include "remote.h" |
11395323 YQ |
32 | |
33 | #ifndef O_LARGEFILE | |
34 | #define O_LARGEFILE 0 | |
35 | #endif | |
7951c4eb YQ |
36 | |
37 | /* TFILE trace writer. */ | |
38 | ||
39 | struct tfile_trace_file_writer | |
40 | { | |
41 | struct trace_file_writer base; | |
42 | ||
43 | /* File pointer to tfile trace file. */ | |
44 | FILE *fp; | |
45 | /* Path name of the tfile trace file. */ | |
46 | char *pathname; | |
47 | }; | |
48 | ||
49 | /* This is the implementation of trace_file_write_ops method | |
50 | target_save. We just call the generic target | |
51 | target_save_trace_data to do target-side saving. */ | |
52 | ||
53 | static int | |
54 | tfile_target_save (struct trace_file_writer *self, | |
55 | const char *filename) | |
56 | { | |
57 | int err = target_save_trace_data (filename); | |
58 | ||
59 | return (err >= 0); | |
60 | } | |
61 | ||
62 | /* This is the implementation of trace_file_write_ops method | |
63 | dtor. */ | |
64 | ||
65 | static void | |
66 | tfile_dtor (struct trace_file_writer *self) | |
67 | { | |
68 | struct tfile_trace_file_writer *writer | |
69 | = (struct tfile_trace_file_writer *) self; | |
70 | ||
71 | xfree (writer->pathname); | |
72 | ||
73 | if (writer->fp != NULL) | |
74 | fclose (writer->fp); | |
75 | } | |
76 | ||
77 | /* This is the implementation of trace_file_write_ops method | |
78 | start. It creates the trace file FILENAME and registers some | |
79 | cleanups. */ | |
80 | ||
81 | static void | |
82 | tfile_start (struct trace_file_writer *self, const char *filename) | |
83 | { | |
84 | struct tfile_trace_file_writer *writer | |
85 | = (struct tfile_trace_file_writer *) self; | |
86 | ||
87 | writer->pathname = tilde_expand (filename); | |
88 | writer->fp = gdb_fopen_cloexec (writer->pathname, "wb"); | |
89 | if (writer->fp == NULL) | |
90 | error (_("Unable to open file '%s' for saving trace data (%s)"), | |
91 | writer->pathname, safe_strerror (errno)); | |
92 | } | |
93 | ||
94 | /* This is the implementation of trace_file_write_ops method | |
95 | write_header. Write the TFILE header. */ | |
96 | ||
97 | static void | |
98 | tfile_write_header (struct trace_file_writer *self) | |
99 | { | |
100 | struct tfile_trace_file_writer *writer | |
101 | = (struct tfile_trace_file_writer *) self; | |
102 | int written; | |
103 | ||
104 | /* Write a file header, with a high-bit-set char to indicate a | |
105 | binary file, plus a hint as what this file is, and a version | |
106 | number in case of future needs. */ | |
107 | written = fwrite ("\x7fTRACE0\n", 8, 1, writer->fp); | |
108 | if (written < 1) | |
109 | perror_with_name (writer->pathname); | |
110 | } | |
111 | ||
112 | /* This is the implementation of trace_file_write_ops method | |
113 | write_regblock_type. Write the size of register block. */ | |
114 | ||
115 | static void | |
116 | tfile_write_regblock_type (struct trace_file_writer *self, int size) | |
117 | { | |
118 | struct tfile_trace_file_writer *writer | |
119 | = (struct tfile_trace_file_writer *) self; | |
120 | ||
121 | fprintf (writer->fp, "R %x\n", size); | |
122 | } | |
123 | ||
124 | /* This is the implementation of trace_file_write_ops method | |
125 | write_status. */ | |
126 | ||
127 | static void | |
128 | tfile_write_status (struct trace_file_writer *self, | |
129 | struct trace_status *ts) | |
130 | { | |
131 | struct tfile_trace_file_writer *writer | |
132 | = (struct tfile_trace_file_writer *) self; | |
133 | ||
134 | fprintf (writer->fp, "status %c;%s", | |
135 | (ts->running ? '1' : '0'), stop_reason_names[ts->stop_reason]); | |
136 | if (ts->stop_reason == tracepoint_error | |
137 | || ts->stop_reason == tstop_command) | |
138 | { | |
139 | char *buf = (char *) alloca (strlen (ts->stop_desc) * 2 + 1); | |
140 | ||
141 | bin2hex ((gdb_byte *) ts->stop_desc, buf, strlen (ts->stop_desc)); | |
142 | fprintf (writer->fp, ":%s", buf); | |
143 | } | |
144 | fprintf (writer->fp, ":%x", ts->stopping_tracepoint); | |
145 | if (ts->traceframe_count >= 0) | |
146 | fprintf (writer->fp, ";tframes:%x", ts->traceframe_count); | |
147 | if (ts->traceframes_created >= 0) | |
148 | fprintf (writer->fp, ";tcreated:%x", ts->traceframes_created); | |
149 | if (ts->buffer_free >= 0) | |
150 | fprintf (writer->fp, ";tfree:%x", ts->buffer_free); | |
151 | if (ts->buffer_size >= 0) | |
152 | fprintf (writer->fp, ";tsize:%x", ts->buffer_size); | |
153 | if (ts->disconnected_tracing) | |
154 | fprintf (writer->fp, ";disconn:%x", ts->disconnected_tracing); | |
155 | if (ts->circular_buffer) | |
156 | fprintf (writer->fp, ";circular:%x", ts->circular_buffer); | |
157 | if (ts->start_time) | |
158 | { | |
159 | fprintf (writer->fp, ";starttime:%s", | |
160 | phex_nz (ts->start_time, sizeof (ts->start_time))); | |
161 | } | |
162 | if (ts->stop_time) | |
163 | { | |
164 | fprintf (writer->fp, ";stoptime:%s", | |
165 | phex_nz (ts->stop_time, sizeof (ts->stop_time))); | |
166 | } | |
167 | if (ts->notes != NULL) | |
168 | { | |
169 | char *buf = (char *) alloca (strlen (ts->notes) * 2 + 1); | |
170 | ||
171 | bin2hex ((gdb_byte *) ts->notes, buf, strlen (ts->notes)); | |
172 | fprintf (writer->fp, ";notes:%s", buf); | |
173 | } | |
174 | if (ts->user_name != NULL) | |
175 | { | |
176 | char *buf = (char *) alloca (strlen (ts->user_name) * 2 + 1); | |
177 | ||
178 | bin2hex ((gdb_byte *) ts->user_name, buf, strlen (ts->user_name)); | |
179 | fprintf (writer->fp, ";username:%s", buf); | |
180 | } | |
181 | fprintf (writer->fp, "\n"); | |
182 | } | |
183 | ||
184 | /* This is the implementation of trace_file_write_ops method | |
185 | write_uploaded_tsv. */ | |
186 | ||
187 | static void | |
188 | tfile_write_uploaded_tsv (struct trace_file_writer *self, | |
189 | struct uploaded_tsv *utsv) | |
190 | { | |
191 | char *buf = ""; | |
192 | struct tfile_trace_file_writer *writer | |
193 | = (struct tfile_trace_file_writer *) self; | |
194 | ||
195 | if (utsv->name) | |
196 | { | |
197 | buf = (char *) xmalloc (strlen (utsv->name) * 2 + 1); | |
198 | bin2hex ((gdb_byte *) (utsv->name), buf, strlen (utsv->name)); | |
199 | } | |
200 | ||
201 | fprintf (writer->fp, "tsv %x:%s:%x:%s\n", | |
202 | utsv->number, phex_nz (utsv->initial_value, 8), | |
203 | utsv->builtin, buf); | |
204 | ||
205 | if (utsv->name) | |
206 | xfree (buf); | |
207 | } | |
208 | ||
209 | #define MAX_TRACE_UPLOAD 2000 | |
210 | ||
211 | /* This is the implementation of trace_file_write_ops method | |
212 | write_uploaded_tp. */ | |
213 | ||
214 | static void | |
215 | tfile_write_uploaded_tp (struct trace_file_writer *self, | |
216 | struct uploaded_tp *utp) | |
217 | { | |
218 | struct tfile_trace_file_writer *writer | |
219 | = (struct tfile_trace_file_writer *) self; | |
220 | int a; | |
221 | char *act; | |
222 | char buf[MAX_TRACE_UPLOAD]; | |
223 | ||
224 | fprintf (writer->fp, "tp T%x:%s:%c:%x:%x", | |
225 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), | |
226 | (utp->enabled ? 'E' : 'D'), utp->step, utp->pass); | |
227 | if (utp->type == bp_fast_tracepoint) | |
228 | fprintf (writer->fp, ":F%x", utp->orig_size); | |
229 | if (utp->cond) | |
230 | fprintf (writer->fp, | |
231 | ":X%x,%s", (unsigned int) strlen (utp->cond) / 2, | |
232 | utp->cond); | |
233 | fprintf (writer->fp, "\n"); | |
234 | for (a = 0; VEC_iterate (char_ptr, utp->actions, a, act); ++a) | |
235 | fprintf (writer->fp, "tp A%x:%s:%s\n", | |
236 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act); | |
237 | for (a = 0; VEC_iterate (char_ptr, utp->step_actions, a, act); ++a) | |
238 | fprintf (writer->fp, "tp S%x:%s:%s\n", | |
239 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act); | |
240 | if (utp->at_string) | |
241 | { | |
242 | encode_source_string (utp->number, utp->addr, | |
243 | "at", utp->at_string, buf, MAX_TRACE_UPLOAD); | |
244 | fprintf (writer->fp, "tp Z%s\n", buf); | |
245 | } | |
246 | if (utp->cond_string) | |
247 | { | |
248 | encode_source_string (utp->number, utp->addr, | |
249 | "cond", utp->cond_string, | |
250 | buf, MAX_TRACE_UPLOAD); | |
251 | fprintf (writer->fp, "tp Z%s\n", buf); | |
252 | } | |
253 | for (a = 0; VEC_iterate (char_ptr, utp->cmd_strings, a, act); ++a) | |
254 | { | |
255 | encode_source_string (utp->number, utp->addr, "cmd", act, | |
256 | buf, MAX_TRACE_UPLOAD); | |
257 | fprintf (writer->fp, "tp Z%s\n", buf); | |
258 | } | |
259 | fprintf (writer->fp, "tp V%x:%s:%x:%s\n", | |
260 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), | |
261 | utp->hit_count, | |
262 | phex_nz (utp->traceframe_usage, | |
263 | sizeof (utp->traceframe_usage))); | |
264 | } | |
265 | ||
266 | /* This is the implementation of trace_file_write_ops method | |
267 | write_definition_end. */ | |
268 | ||
269 | static void | |
270 | tfile_write_definition_end (struct trace_file_writer *self) | |
271 | { | |
272 | struct tfile_trace_file_writer *writer | |
273 | = (struct tfile_trace_file_writer *) self; | |
274 | ||
275 | fprintf (writer->fp, "\n"); | |
276 | } | |
277 | ||
278 | /* This is the implementation of trace_file_write_ops method | |
279 | write_raw_data. */ | |
280 | ||
281 | static void | |
282 | tfile_write_raw_data (struct trace_file_writer *self, gdb_byte *buf, | |
283 | LONGEST len) | |
284 | { | |
285 | struct tfile_trace_file_writer *writer | |
286 | = (struct tfile_trace_file_writer *) self; | |
287 | ||
288 | if (fwrite (buf, len, 1, writer->fp) < 1) | |
289 | perror_with_name (writer->pathname); | |
290 | } | |
291 | ||
292 | /* This is the implementation of trace_file_write_ops method | |
293 | end. */ | |
294 | ||
295 | static void | |
296 | tfile_end (struct trace_file_writer *self) | |
297 | { | |
298 | struct tfile_trace_file_writer *writer | |
299 | = (struct tfile_trace_file_writer *) self; | |
300 | uint32_t gotten = 0; | |
301 | ||
302 | /* Mark the end of trace data. */ | |
303 | if (fwrite (&gotten, 4, 1, writer->fp) < 1) | |
304 | perror_with_name (writer->pathname); | |
305 | } | |
306 | ||
307 | /* Operations to write trace buffers into TFILE format. */ | |
308 | ||
309 | static const struct trace_file_write_ops tfile_write_ops = | |
310 | { | |
311 | tfile_dtor, | |
312 | tfile_target_save, | |
313 | tfile_start, | |
314 | tfile_write_header, | |
315 | tfile_write_regblock_type, | |
316 | tfile_write_status, | |
317 | tfile_write_uploaded_tsv, | |
318 | tfile_write_uploaded_tp, | |
319 | tfile_write_definition_end, | |
320 | tfile_write_raw_data, | |
321 | NULL, | |
322 | tfile_end, | |
323 | }; | |
324 | ||
325 | /* Return a trace writer for TFILE format. */ | |
326 | ||
327 | struct trace_file_writer * | |
328 | tfile_trace_file_writer_new (void) | |
329 | { | |
330 | struct tfile_trace_file_writer *writer | |
8d749320 | 331 | = XNEW (struct tfile_trace_file_writer); |
7951c4eb YQ |
332 | |
333 | writer->base.ops = &tfile_write_ops; | |
334 | writer->fp = NULL; | |
335 | writer->pathname = NULL; | |
336 | ||
337 | return (struct trace_file_writer *) writer; | |
338 | } | |
11395323 YQ |
339 | |
340 | /* target tfile command */ | |
341 | ||
342 | static struct target_ops tfile_ops; | |
343 | ||
344 | /* Fill in tfile_ops with its defined operations and properties. */ | |
345 | ||
346 | #define TRACE_HEADER_SIZE 8 | |
347 | ||
348 | #define TFILE_PID (1) | |
349 | ||
350 | static char *trace_filename; | |
351 | static int trace_fd = -1; | |
352 | static off_t trace_frames_offset; | |
353 | static off_t cur_offset; | |
354 | static int cur_data_size; | |
355 | int trace_regblock_size; | |
356 | ||
357 | static void tfile_interp_line (char *line, | |
358 | struct uploaded_tp **utpp, | |
359 | struct uploaded_tsv **utsvp); | |
360 | ||
361 | /* Read SIZE bytes into READBUF from the trace frame, starting at | |
362 | TRACE_FD's current position. Note that this call `read' | |
363 | underneath, hence it advances the file's seek position. Throws an | |
364 | error if the `read' syscall fails, or less than SIZE bytes are | |
365 | read. */ | |
366 | ||
367 | static void | |
368 | tfile_read (gdb_byte *readbuf, int size) | |
369 | { | |
370 | int gotten; | |
371 | ||
372 | gotten = read (trace_fd, readbuf, size); | |
373 | if (gotten < 0) | |
374 | perror_with_name (trace_filename); | |
375 | else if (gotten < size) | |
376 | error (_("Premature end of file while reading trace file")); | |
377 | } | |
378 | ||
379 | static void | |
014f9477 | 380 | tfile_open (const char *arg, int from_tty) |
11395323 | 381 | { |
11395323 YQ |
382 | char *temp; |
383 | struct cleanup *old_chain; | |
384 | int flags; | |
385 | int scratch_chan; | |
386 | char header[TRACE_HEADER_SIZE]; | |
387 | char linebuf[1000]; /* Should be max remote packet size or so. */ | |
388 | gdb_byte byte; | |
389 | int bytes, i; | |
390 | struct trace_status *ts; | |
391 | struct uploaded_tp *uploaded_tps = NULL; | |
392 | struct uploaded_tsv *uploaded_tsvs = NULL; | |
014f9477 | 393 | char *filename; |
11395323 YQ |
394 | |
395 | target_preopen (from_tty); | |
014f9477 | 396 | if (!arg) |
11395323 YQ |
397 | error (_("No trace file specified.")); |
398 | ||
014f9477 | 399 | filename = tilde_expand (arg); |
11395323 YQ |
400 | if (!IS_ABSOLUTE_PATH(filename)) |
401 | { | |
402 | temp = concat (current_directory, "/", filename, (char *) NULL); | |
403 | xfree (filename); | |
404 | filename = temp; | |
405 | } | |
406 | ||
407 | old_chain = make_cleanup (xfree, filename); | |
408 | ||
409 | flags = O_BINARY | O_LARGEFILE; | |
410 | flags |= O_RDONLY; | |
411 | scratch_chan = gdb_open_cloexec (filename, flags, 0); | |
412 | if (scratch_chan < 0) | |
413 | perror_with_name (filename); | |
414 | ||
415 | /* Looks semi-reasonable. Toss the old trace file and work on the new. */ | |
416 | ||
417 | discard_cleanups (old_chain); /* Don't free filename any more. */ | |
418 | unpush_target (&tfile_ops); | |
419 | ||
420 | trace_filename = xstrdup (filename); | |
421 | trace_fd = scratch_chan; | |
422 | ||
423 | bytes = 0; | |
424 | /* Read the file header and test for validity. */ | |
425 | tfile_read ((gdb_byte *) &header, TRACE_HEADER_SIZE); | |
426 | ||
427 | bytes += TRACE_HEADER_SIZE; | |
428 | if (!(header[0] == 0x7f | |
61012eef | 429 | && (startswith (header + 1, "TRACE0\n")))) |
11395323 YQ |
430 | error (_("File is not a valid trace file.")); |
431 | ||
432 | push_target (&tfile_ops); | |
433 | ||
434 | trace_regblock_size = 0; | |
435 | ts = current_trace_status (); | |
436 | /* We know we're working with a file. Record its name. */ | |
437 | ts->filename = trace_filename; | |
438 | /* Set defaults in case there is no status line. */ | |
439 | ts->running_known = 0; | |
440 | ts->stop_reason = trace_stop_reason_unknown; | |
441 | ts->traceframe_count = -1; | |
442 | ts->buffer_free = 0; | |
443 | ts->disconnected_tracing = 0; | |
444 | ts->circular_buffer = 0; | |
445 | ||
492d29ea | 446 | TRY |
11395323 YQ |
447 | { |
448 | /* Read through a section of newline-terminated lines that | |
449 | define things like tracepoints. */ | |
450 | i = 0; | |
451 | while (1) | |
452 | { | |
453 | tfile_read (&byte, 1); | |
454 | ||
455 | ++bytes; | |
456 | if (byte == '\n') | |
457 | { | |
458 | /* Empty line marks end of the definition section. */ | |
459 | if (i == 0) | |
460 | break; | |
461 | linebuf[i] = '\0'; | |
462 | i = 0; | |
463 | tfile_interp_line (linebuf, &uploaded_tps, &uploaded_tsvs); | |
464 | } | |
465 | else | |
466 | linebuf[i++] = byte; | |
467 | if (i >= 1000) | |
468 | error (_("Excessively long lines in trace file")); | |
469 | } | |
470 | ||
471 | /* Record the starting offset of the binary trace data. */ | |
472 | trace_frames_offset = bytes; | |
473 | ||
474 | /* If we don't have a blocksize, we can't interpret the | |
475 | traceframes. */ | |
476 | if (trace_regblock_size == 0) | |
477 | error (_("No register block size recorded in trace file")); | |
478 | } | |
492d29ea | 479 | CATCH (ex, RETURN_MASK_ALL) |
11395323 YQ |
480 | { |
481 | /* Remove the partially set up target. */ | |
482 | unpush_target (&tfile_ops); | |
483 | throw_exception (ex); | |
484 | } | |
492d29ea | 485 | END_CATCH |
11395323 YQ |
486 | |
487 | inferior_appeared (current_inferior (), TFILE_PID); | |
488 | inferior_ptid = pid_to_ptid (TFILE_PID); | |
489 | add_thread_silent (inferior_ptid); | |
490 | ||
491 | if (ts->traceframe_count <= 0) | |
492 | warning (_("No traceframes present in this file.")); | |
493 | ||
494 | /* Add the file's tracepoints and variables into the current mix. */ | |
495 | ||
496 | /* Get trace state variables first, they may be checked when parsing | |
497 | uploaded commands. */ | |
498 | merge_uploaded_trace_state_variables (&uploaded_tsvs); | |
499 | ||
500 | merge_uploaded_tracepoints (&uploaded_tps); | |
501 | ||
502 | post_create_inferior (&tfile_ops, from_tty); | |
503 | } | |
504 | ||
505 | /* Interpret the given line from the definitions part of the trace | |
506 | file. */ | |
507 | ||
508 | static void | |
509 | tfile_interp_line (char *line, struct uploaded_tp **utpp, | |
510 | struct uploaded_tsv **utsvp) | |
511 | { | |
512 | char *p = line; | |
513 | ||
61012eef | 514 | if (startswith (p, "R ")) |
11395323 YQ |
515 | { |
516 | p += strlen ("R "); | |
517 | trace_regblock_size = strtol (p, &p, 16); | |
518 | } | |
61012eef | 519 | else if (startswith (p, "status ")) |
11395323 YQ |
520 | { |
521 | p += strlen ("status "); | |
522 | parse_trace_status (p, current_trace_status ()); | |
523 | } | |
61012eef | 524 | else if (startswith (p, "tp ")) |
11395323 YQ |
525 | { |
526 | p += strlen ("tp "); | |
527 | parse_tracepoint_definition (p, utpp); | |
528 | } | |
61012eef | 529 | else if (startswith (p, "tsv ")) |
11395323 YQ |
530 | { |
531 | p += strlen ("tsv "); | |
532 | parse_tsv_definition (p, utsvp); | |
533 | } | |
534 | else | |
535 | warning (_("Ignoring trace file definition \"%s\""), line); | |
536 | } | |
537 | ||
538 | /* Close the trace file and generally clean up. */ | |
539 | ||
540 | static void | |
541 | tfile_close (struct target_ops *self) | |
542 | { | |
543 | int pid; | |
544 | ||
545 | if (trace_fd < 0) | |
546 | return; | |
547 | ||
548 | pid = ptid_get_pid (inferior_ptid); | |
549 | inferior_ptid = null_ptid; /* Avoid confusion from thread stuff. */ | |
550 | exit_inferior_silent (pid); | |
551 | ||
552 | close (trace_fd); | |
553 | trace_fd = -1; | |
554 | xfree (trace_filename); | |
555 | trace_filename = NULL; | |
556 | ||
557 | trace_reset_local_state (); | |
558 | } | |
559 | ||
560 | static void | |
561 | tfile_files_info (struct target_ops *t) | |
562 | { | |
563 | printf_filtered ("\t`%s'\n", trace_filename); | |
564 | } | |
565 | ||
11395323 YQ |
566 | static void |
567 | tfile_get_tracepoint_status (struct target_ops *self, | |
568 | struct breakpoint *tp, struct uploaded_tp *utp) | |
569 | { | |
570 | /* Other bits of trace status were collected as part of opening the | |
571 | trace files, so nothing to do here. */ | |
572 | } | |
573 | ||
574 | /* Given the position of a traceframe in the file, figure out what | |
575 | address the frame was collected at. This would normally be the | |
576 | value of a collected PC register, but if not available, we | |
577 | improvise. */ | |
578 | ||
579 | static CORE_ADDR | |
580 | tfile_get_traceframe_address (off_t tframe_offset) | |
581 | { | |
582 | CORE_ADDR addr = 0; | |
583 | short tpnum; | |
584 | struct tracepoint *tp; | |
585 | off_t saved_offset = cur_offset; | |
586 | ||
587 | /* FIXME dig pc out of collected registers. */ | |
588 | ||
589 | /* Fall back to using tracepoint address. */ | |
590 | lseek (trace_fd, tframe_offset, SEEK_SET); | |
591 | tfile_read ((gdb_byte *) &tpnum, 2); | |
592 | tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, | |
593 | gdbarch_byte_order | |
594 | (target_gdbarch ())); | |
595 | ||
596 | tp = get_tracepoint_by_number_on_target (tpnum); | |
597 | /* FIXME this is a poor heuristic if multiple locations. */ | |
598 | if (tp && tp->base.loc) | |
599 | addr = tp->base.loc->address; | |
600 | ||
601 | /* Restore our seek position. */ | |
602 | cur_offset = saved_offset; | |
603 | lseek (trace_fd, cur_offset, SEEK_SET); | |
604 | return addr; | |
605 | } | |
606 | ||
607 | /* Given a type of search and some parameters, scan the collection of | |
608 | traceframes in the file looking for a match. When found, return | |
609 | both the traceframe and tracepoint number, otherwise -1 for | |
610 | each. */ | |
611 | ||
612 | static int | |
613 | tfile_trace_find (struct target_ops *self, enum trace_find_type type, int num, | |
614 | CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) | |
615 | { | |
616 | short tpnum; | |
617 | int tfnum = 0, found = 0; | |
618 | unsigned int data_size; | |
619 | struct tracepoint *tp; | |
620 | off_t offset, tframe_offset; | |
621 | CORE_ADDR tfaddr; | |
622 | ||
623 | if (num == -1) | |
624 | { | |
625 | if (tpp) | |
626 | *tpp = -1; | |
627 | return -1; | |
628 | } | |
629 | ||
630 | lseek (trace_fd, trace_frames_offset, SEEK_SET); | |
631 | offset = trace_frames_offset; | |
632 | while (1) | |
633 | { | |
634 | tframe_offset = offset; | |
635 | tfile_read ((gdb_byte *) &tpnum, 2); | |
636 | tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, | |
637 | gdbarch_byte_order | |
638 | (target_gdbarch ())); | |
639 | offset += 2; | |
640 | if (tpnum == 0) | |
641 | break; | |
642 | tfile_read ((gdb_byte *) &data_size, 4); | |
643 | data_size = (unsigned int) extract_unsigned_integer | |
644 | ((gdb_byte *) &data_size, 4, | |
645 | gdbarch_byte_order (target_gdbarch ())); | |
646 | offset += 4; | |
647 | ||
648 | if (type == tfind_number) | |
649 | { | |
650 | /* Looking for a specific trace frame. */ | |
651 | if (tfnum == num) | |
652 | found = 1; | |
653 | } | |
654 | else | |
655 | { | |
656 | /* Start from the _next_ trace frame. */ | |
657 | if (tfnum > get_traceframe_number ()) | |
658 | { | |
659 | switch (type) | |
660 | { | |
661 | case tfind_pc: | |
662 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
663 | if (tfaddr == addr1) | |
664 | found = 1; | |
665 | break; | |
666 | case tfind_tp: | |
667 | tp = get_tracepoint (num); | |
668 | if (tp && tpnum == tp->number_on_target) | |
669 | found = 1; | |
670 | break; | |
671 | case tfind_range: | |
672 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
673 | if (addr1 <= tfaddr && tfaddr <= addr2) | |
674 | found = 1; | |
675 | break; | |
676 | case tfind_outside: | |
677 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
678 | if (!(addr1 <= tfaddr && tfaddr <= addr2)) | |
679 | found = 1; | |
680 | break; | |
681 | default: | |
682 | internal_error (__FILE__, __LINE__, _("unknown tfind type")); | |
683 | } | |
684 | } | |
685 | } | |
686 | ||
687 | if (found) | |
688 | { | |
689 | if (tpp) | |
690 | *tpp = tpnum; | |
691 | cur_offset = offset; | |
692 | cur_data_size = data_size; | |
693 | ||
694 | return tfnum; | |
695 | } | |
696 | /* Skip past the traceframe's data. */ | |
697 | lseek (trace_fd, data_size, SEEK_CUR); | |
698 | offset += data_size; | |
699 | /* Update our own count of traceframes. */ | |
700 | ++tfnum; | |
701 | } | |
702 | /* Did not find what we were looking for. */ | |
703 | if (tpp) | |
704 | *tpp = -1; | |
705 | return -1; | |
706 | } | |
707 | ||
708 | /* Prototype of the callback passed to tframe_walk_blocks. */ | |
709 | typedef int (*walk_blocks_callback_func) (char blocktype, void *data); | |
710 | ||
711 | /* Callback for traceframe_walk_blocks, used to find a given block | |
712 | type in a traceframe. */ | |
713 | ||
714 | static int | |
715 | match_blocktype (char blocktype, void *data) | |
716 | { | |
19ba03f4 | 717 | char *wantedp = (char *) data; |
11395323 YQ |
718 | |
719 | if (*wantedp == blocktype) | |
720 | return 1; | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
725 | /* Walk over all traceframe block starting at POS offset from | |
726 | CUR_OFFSET, and call CALLBACK for each block found, passing in DATA | |
727 | unmodified. If CALLBACK returns true, this returns the position in | |
728 | the traceframe where the block is found, relative to the start of | |
729 | the traceframe (cur_offset). Returns -1 if no callback call | |
730 | returned true, indicating that all blocks have been walked. */ | |
731 | ||
732 | static int | |
733 | traceframe_walk_blocks (walk_blocks_callback_func callback, | |
734 | int pos, void *data) | |
735 | { | |
736 | /* Iterate through a traceframe's blocks, looking for a block of the | |
737 | requested type. */ | |
738 | ||
739 | lseek (trace_fd, cur_offset + pos, SEEK_SET); | |
740 | while (pos < cur_data_size) | |
741 | { | |
742 | unsigned short mlen; | |
743 | char block_type; | |
744 | ||
745 | tfile_read ((gdb_byte *) &block_type, 1); | |
746 | ||
747 | ++pos; | |
748 | ||
749 | if ((*callback) (block_type, data)) | |
750 | return pos; | |
751 | ||
752 | switch (block_type) | |
753 | { | |
754 | case 'R': | |
755 | lseek (trace_fd, cur_offset + pos + trace_regblock_size, SEEK_SET); | |
756 | pos += trace_regblock_size; | |
757 | break; | |
758 | case 'M': | |
759 | lseek (trace_fd, cur_offset + pos + 8, SEEK_SET); | |
760 | tfile_read ((gdb_byte *) &mlen, 2); | |
761 | mlen = (unsigned short) | |
762 | extract_unsigned_integer ((gdb_byte *) &mlen, 2, | |
763 | gdbarch_byte_order | |
764 | (target_gdbarch ())); | |
765 | lseek (trace_fd, mlen, SEEK_CUR); | |
766 | pos += (8 + 2 + mlen); | |
767 | break; | |
768 | case 'V': | |
769 | lseek (trace_fd, cur_offset + pos + 4 + 8, SEEK_SET); | |
770 | pos += (4 + 8); | |
771 | break; | |
772 | default: | |
773 | error (_("Unknown block type '%c' (0x%x) in trace frame"), | |
774 | block_type, block_type); | |
775 | break; | |
776 | } | |
777 | } | |
778 | ||
779 | return -1; | |
780 | } | |
781 | ||
782 | /* Convenience wrapper around traceframe_walk_blocks. Looks for the | |
783 | position offset of a block of type TYPE_WANTED in the current trace | |
784 | frame, starting at POS. Returns -1 if no such block was found. */ | |
785 | ||
786 | static int | |
787 | traceframe_find_block_type (char type_wanted, int pos) | |
788 | { | |
789 | return traceframe_walk_blocks (match_blocktype, pos, &type_wanted); | |
790 | } | |
791 | ||
792 | /* Look for a block of saved registers in the traceframe, and get the | |
793 | requested register from it. */ | |
794 | ||
795 | static void | |
796 | tfile_fetch_registers (struct target_ops *ops, | |
797 | struct regcache *regcache, int regno) | |
798 | { | |
799 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
e909d859 | 800 | int offset, regn, regsize, dummy; |
11395323 YQ |
801 | |
802 | /* An uninitialized reg size says we're not going to be | |
803 | successful at getting register blocks. */ | |
804 | if (!trace_regblock_size) | |
805 | return; | |
806 | ||
11395323 YQ |
807 | if (traceframe_find_block_type ('R', 0) >= 0) |
808 | { | |
224c3ddb | 809 | gdb_byte *regs = (gdb_byte *) alloca (trace_regblock_size); |
48b6e87e | 810 | |
11395323 YQ |
811 | tfile_read (regs, trace_regblock_size); |
812 | ||
11395323 YQ |
813 | for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++) |
814 | { | |
e909d859 MK |
815 | if (!remote_register_number_and_offset (get_regcache_arch (regcache), |
816 | regn, &dummy, &offset)) | |
817 | continue; | |
818 | ||
11395323 YQ |
819 | regsize = register_size (gdbarch, regn); |
820 | /* Make sure we stay within block bounds. */ | |
473b99e5 | 821 | if (offset + regsize > trace_regblock_size) |
11395323 YQ |
822 | break; |
823 | if (regcache_register_status (regcache, regn) == REG_UNKNOWN) | |
824 | { | |
825 | if (regno == regn) | |
826 | { | |
827 | regcache_raw_supply (regcache, regno, regs + offset); | |
828 | break; | |
829 | } | |
830 | else if (regno == -1) | |
831 | { | |
832 | regcache_raw_supply (regcache, regn, regs + offset); | |
833 | } | |
834 | } | |
11395323 | 835 | } |
11395323 | 836 | } |
48b6e87e YQ |
837 | else |
838 | tracefile_fetch_registers (regcache, regno); | |
11395323 YQ |
839 | } |
840 | ||
841 | static enum target_xfer_status | |
842 | tfile_xfer_partial (struct target_ops *ops, enum target_object object, | |
843 | const char *annex, gdb_byte *readbuf, | |
844 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, | |
845 | ULONGEST *xfered_len) | |
846 | { | |
847 | /* We're only doing regular memory for now. */ | |
848 | if (object != TARGET_OBJECT_MEMORY) | |
849 | return TARGET_XFER_E_IO; | |
850 | ||
851 | if (readbuf == NULL) | |
852 | error (_("tfile_xfer_partial: trace file is read-only")); | |
853 | ||
854 | if (get_traceframe_number () != -1) | |
855 | { | |
856 | int pos = 0; | |
8acf9577 | 857 | enum target_xfer_status res; |
290a839c YQ |
858 | /* Records the lowest available address of all blocks that |
859 | intersects the requested range. */ | |
860 | ULONGEST low_addr_available = 0; | |
11395323 YQ |
861 | |
862 | /* Iterate through the traceframe's blocks, looking for | |
863 | memory. */ | |
864 | while ((pos = traceframe_find_block_type ('M', pos)) >= 0) | |
865 | { | |
866 | ULONGEST maddr, amt; | |
867 | unsigned short mlen; | |
868 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
869 | ||
870 | tfile_read ((gdb_byte *) &maddr, 8); | |
871 | maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, | |
872 | byte_order); | |
873 | tfile_read ((gdb_byte *) &mlen, 2); | |
874 | mlen = (unsigned short) | |
875 | extract_unsigned_integer ((gdb_byte *) &mlen, 2, byte_order); | |
876 | ||
877 | /* If the block includes the first part of the desired | |
878 | range, return as much it has; GDB will re-request the | |
879 | remainder, which might be in a different block of this | |
880 | trace frame. */ | |
881 | if (maddr <= offset && offset < (maddr + mlen)) | |
882 | { | |
883 | amt = (maddr + mlen) - offset; | |
884 | if (amt > len) | |
885 | amt = len; | |
886 | ||
887 | if (maddr != offset) | |
888 | lseek (trace_fd, offset - maddr, SEEK_CUR); | |
889 | tfile_read (readbuf, amt); | |
890 | *xfered_len = amt; | |
891 | return TARGET_XFER_OK; | |
892 | } | |
893 | ||
290a839c YQ |
894 | if (offset < maddr && maddr < (offset + len)) |
895 | if (low_addr_available == 0 || low_addr_available > maddr) | |
896 | low_addr_available = maddr; | |
897 | ||
11395323 YQ |
898 | /* Skip over this block. */ |
899 | pos += (8 + 2 + mlen); | |
900 | } | |
11395323 | 901 | |
8acf9577 YQ |
902 | /* Requested memory is unavailable in the context of traceframes, |
903 | and this address falls within a read-only section, fallback | |
290a839c YQ |
904 | to reading from executable, up to LOW_ADDR_AVAILABLE. */ |
905 | if (offset < low_addr_available) | |
906 | len = min (len, low_addr_available - offset); | |
8acf9577 YQ |
907 | res = exec_read_partial_read_only (readbuf, offset, len, xfered_len); |
908 | ||
909 | if (res == TARGET_XFER_OK) | |
910 | return TARGET_XFER_OK; | |
911 | else | |
912 | { | |
913 | /* No use trying further, we know some memory starting | |
914 | at MEMADDR isn't available. */ | |
915 | *xfered_len = len; | |
916 | return TARGET_XFER_UNAVAILABLE; | |
917 | } | |
1ee79381 YQ |
918 | } |
919 | else | |
920 | { | |
921 | /* Fallback to reading from read-only sections. */ | |
922 | return section_table_read_available_memory (readbuf, offset, len, | |
923 | xfered_len); | |
924 | } | |
11395323 YQ |
925 | } |
926 | ||
927 | /* Iterate through the blocks of a trace frame, looking for a 'V' | |
928 | block with a matching tsv number. */ | |
929 | ||
930 | static int | |
931 | tfile_get_trace_state_variable_value (struct target_ops *self, | |
932 | int tsvnum, LONGEST *val) | |
933 | { | |
934 | int pos; | |
935 | int found = 0; | |
936 | ||
937 | /* Iterate over blocks in current frame and find the last 'V' | |
938 | block in which tsv number is TSVNUM. In one trace frame, there | |
939 | may be multiple 'V' blocks created for a given trace variable, | |
940 | and the last matched 'V' block contains the updated value. */ | |
941 | pos = 0; | |
942 | while ((pos = traceframe_find_block_type ('V', pos)) >= 0) | |
943 | { | |
944 | int vnum; | |
945 | ||
946 | tfile_read ((gdb_byte *) &vnum, 4); | |
947 | vnum = (int) extract_signed_integer ((gdb_byte *) &vnum, 4, | |
948 | gdbarch_byte_order | |
949 | (target_gdbarch ())); | |
950 | if (tsvnum == vnum) | |
951 | { | |
952 | tfile_read ((gdb_byte *) val, 8); | |
953 | *val = extract_signed_integer ((gdb_byte *) val, 8, | |
954 | gdbarch_byte_order | |
955 | (target_gdbarch ())); | |
956 | found = 1; | |
957 | } | |
958 | pos += (4 + 8); | |
959 | } | |
960 | ||
961 | return found; | |
962 | } | |
963 | ||
11395323 YQ |
964 | /* Callback for traceframe_walk_blocks. Builds a traceframe_info |
965 | object for the tfile target's current traceframe. */ | |
966 | ||
967 | static int | |
968 | build_traceframe_info (char blocktype, void *data) | |
969 | { | |
19ba03f4 | 970 | struct traceframe_info *info = (struct traceframe_info *) data; |
11395323 YQ |
971 | |
972 | switch (blocktype) | |
973 | { | |
974 | case 'M': | |
975 | { | |
976 | struct mem_range *r; | |
977 | ULONGEST maddr; | |
978 | unsigned short mlen; | |
979 | ||
980 | tfile_read ((gdb_byte *) &maddr, 8); | |
981 | maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, | |
982 | gdbarch_byte_order | |
983 | (target_gdbarch ())); | |
984 | tfile_read ((gdb_byte *) &mlen, 2); | |
985 | mlen = (unsigned short) | |
986 | extract_unsigned_integer ((gdb_byte *) &mlen, | |
987 | 2, gdbarch_byte_order | |
988 | (target_gdbarch ())); | |
989 | ||
990 | r = VEC_safe_push (mem_range_s, info->memory, NULL); | |
991 | ||
992 | r->start = maddr; | |
993 | r->length = mlen; | |
994 | break; | |
995 | } | |
996 | case 'V': | |
997 | { | |
998 | int vnum; | |
999 | ||
1000 | tfile_read ((gdb_byte *) &vnum, 4); | |
1001 | VEC_safe_push (int, info->tvars, vnum); | |
1002 | } | |
1003 | case 'R': | |
1004 | case 'S': | |
1005 | { | |
1006 | break; | |
1007 | } | |
1008 | default: | |
1009 | warning (_("Unhandled trace block type (%d) '%c ' " | |
1010 | "while building trace frame info."), | |
1011 | blocktype, blocktype); | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static struct traceframe_info * | |
1019 | tfile_traceframe_info (struct target_ops *self) | |
1020 | { | |
1021 | struct traceframe_info *info = XCNEW (struct traceframe_info); | |
1022 | ||
1023 | traceframe_walk_blocks (build_traceframe_info, 0, info); | |
1024 | return info; | |
1025 | } | |
1026 | ||
1027 | static void | |
1028 | init_tfile_ops (void) | |
1029 | { | |
12e03cd0 YQ |
1030 | init_tracefile_ops (&tfile_ops); |
1031 | ||
11395323 YQ |
1032 | tfile_ops.to_shortname = "tfile"; |
1033 | tfile_ops.to_longname = "Local trace dump file"; | |
1034 | tfile_ops.to_doc | |
1035 | = "Use a trace file as a target. Specify the filename of the trace file."; | |
1036 | tfile_ops.to_open = tfile_open; | |
1037 | tfile_ops.to_close = tfile_close; | |
1038 | tfile_ops.to_fetch_registers = tfile_fetch_registers; | |
1039 | tfile_ops.to_xfer_partial = tfile_xfer_partial; | |
1040 | tfile_ops.to_files_info = tfile_files_info; | |
11395323 YQ |
1041 | tfile_ops.to_get_tracepoint_status = tfile_get_tracepoint_status; |
1042 | tfile_ops.to_trace_find = tfile_trace_find; | |
1043 | tfile_ops.to_get_trace_state_variable_value | |
1044 | = tfile_get_trace_state_variable_value; | |
11395323 | 1045 | tfile_ops.to_traceframe_info = tfile_traceframe_info; |
11395323 YQ |
1046 | } |
1047 | ||
1048 | extern initialize_file_ftype _initialize_tracefile_tfile; | |
1049 | ||
1050 | void | |
1051 | _initialize_tracefile_tfile (void) | |
1052 | { | |
1053 | init_tfile_ops (); | |
1054 | ||
1055 | add_target_with_completer (&tfile_ops, filename_completer); | |
1056 | } |