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7951c4eb YQ |
1 | /* Trace file TFILE format support in GDB. |
2 | ||
32d0add0 | 3 | Copyright (C) 1997-2015 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" | |
31 | ||
32 | #ifndef O_LARGEFILE | |
33 | #define O_LARGEFILE 0 | |
34 | #endif | |
7951c4eb YQ |
35 | |
36 | /* TFILE trace writer. */ | |
37 | ||
38 | struct tfile_trace_file_writer | |
39 | { | |
40 | struct trace_file_writer base; | |
41 | ||
42 | /* File pointer to tfile trace file. */ | |
43 | FILE *fp; | |
44 | /* Path name of the tfile trace file. */ | |
45 | char *pathname; | |
46 | }; | |
47 | ||
48 | /* This is the implementation of trace_file_write_ops method | |
49 | target_save. We just call the generic target | |
50 | target_save_trace_data to do target-side saving. */ | |
51 | ||
52 | static int | |
53 | tfile_target_save (struct trace_file_writer *self, | |
54 | const char *filename) | |
55 | { | |
56 | int err = target_save_trace_data (filename); | |
57 | ||
58 | return (err >= 0); | |
59 | } | |
60 | ||
61 | /* This is the implementation of trace_file_write_ops method | |
62 | dtor. */ | |
63 | ||
64 | static void | |
65 | tfile_dtor (struct trace_file_writer *self) | |
66 | { | |
67 | struct tfile_trace_file_writer *writer | |
68 | = (struct tfile_trace_file_writer *) self; | |
69 | ||
70 | xfree (writer->pathname); | |
71 | ||
72 | if (writer->fp != NULL) | |
73 | fclose (writer->fp); | |
74 | } | |
75 | ||
76 | /* This is the implementation of trace_file_write_ops method | |
77 | start. It creates the trace file FILENAME and registers some | |
78 | cleanups. */ | |
79 | ||
80 | static void | |
81 | tfile_start (struct trace_file_writer *self, const char *filename) | |
82 | { | |
83 | struct tfile_trace_file_writer *writer | |
84 | = (struct tfile_trace_file_writer *) self; | |
85 | ||
86 | writer->pathname = tilde_expand (filename); | |
87 | writer->fp = gdb_fopen_cloexec (writer->pathname, "wb"); | |
88 | if (writer->fp == NULL) | |
89 | error (_("Unable to open file '%s' for saving trace data (%s)"), | |
90 | writer->pathname, safe_strerror (errno)); | |
91 | } | |
92 | ||
93 | /* This is the implementation of trace_file_write_ops method | |
94 | write_header. Write the TFILE header. */ | |
95 | ||
96 | static void | |
97 | tfile_write_header (struct trace_file_writer *self) | |
98 | { | |
99 | struct tfile_trace_file_writer *writer | |
100 | = (struct tfile_trace_file_writer *) self; | |
101 | int written; | |
102 | ||
103 | /* Write a file header, with a high-bit-set char to indicate a | |
104 | binary file, plus a hint as what this file is, and a version | |
105 | number in case of future needs. */ | |
106 | written = fwrite ("\x7fTRACE0\n", 8, 1, writer->fp); | |
107 | if (written < 1) | |
108 | perror_with_name (writer->pathname); | |
109 | } | |
110 | ||
111 | /* This is the implementation of trace_file_write_ops method | |
112 | write_regblock_type. Write the size of register block. */ | |
113 | ||
114 | static void | |
115 | tfile_write_regblock_type (struct trace_file_writer *self, int size) | |
116 | { | |
117 | struct tfile_trace_file_writer *writer | |
118 | = (struct tfile_trace_file_writer *) self; | |
119 | ||
120 | fprintf (writer->fp, "R %x\n", size); | |
121 | } | |
122 | ||
123 | /* This is the implementation of trace_file_write_ops method | |
124 | write_status. */ | |
125 | ||
126 | static void | |
127 | tfile_write_status (struct trace_file_writer *self, | |
128 | struct trace_status *ts) | |
129 | { | |
130 | struct tfile_trace_file_writer *writer | |
131 | = (struct tfile_trace_file_writer *) self; | |
132 | ||
133 | fprintf (writer->fp, "status %c;%s", | |
134 | (ts->running ? '1' : '0'), stop_reason_names[ts->stop_reason]); | |
135 | if (ts->stop_reason == tracepoint_error | |
136 | || ts->stop_reason == tstop_command) | |
137 | { | |
138 | char *buf = (char *) alloca (strlen (ts->stop_desc) * 2 + 1); | |
139 | ||
140 | bin2hex ((gdb_byte *) ts->stop_desc, buf, strlen (ts->stop_desc)); | |
141 | fprintf (writer->fp, ":%s", buf); | |
142 | } | |
143 | fprintf (writer->fp, ":%x", ts->stopping_tracepoint); | |
144 | if (ts->traceframe_count >= 0) | |
145 | fprintf (writer->fp, ";tframes:%x", ts->traceframe_count); | |
146 | if (ts->traceframes_created >= 0) | |
147 | fprintf (writer->fp, ";tcreated:%x", ts->traceframes_created); | |
148 | if (ts->buffer_free >= 0) | |
149 | fprintf (writer->fp, ";tfree:%x", ts->buffer_free); | |
150 | if (ts->buffer_size >= 0) | |
151 | fprintf (writer->fp, ";tsize:%x", ts->buffer_size); | |
152 | if (ts->disconnected_tracing) | |
153 | fprintf (writer->fp, ";disconn:%x", ts->disconnected_tracing); | |
154 | if (ts->circular_buffer) | |
155 | fprintf (writer->fp, ";circular:%x", ts->circular_buffer); | |
156 | if (ts->start_time) | |
157 | { | |
158 | fprintf (writer->fp, ";starttime:%s", | |
159 | phex_nz (ts->start_time, sizeof (ts->start_time))); | |
160 | } | |
161 | if (ts->stop_time) | |
162 | { | |
163 | fprintf (writer->fp, ";stoptime:%s", | |
164 | phex_nz (ts->stop_time, sizeof (ts->stop_time))); | |
165 | } | |
166 | if (ts->notes != NULL) | |
167 | { | |
168 | char *buf = (char *) alloca (strlen (ts->notes) * 2 + 1); | |
169 | ||
170 | bin2hex ((gdb_byte *) ts->notes, buf, strlen (ts->notes)); | |
171 | fprintf (writer->fp, ";notes:%s", buf); | |
172 | } | |
173 | if (ts->user_name != NULL) | |
174 | { | |
175 | char *buf = (char *) alloca (strlen (ts->user_name) * 2 + 1); | |
176 | ||
177 | bin2hex ((gdb_byte *) ts->user_name, buf, strlen (ts->user_name)); | |
178 | fprintf (writer->fp, ";username:%s", buf); | |
179 | } | |
180 | fprintf (writer->fp, "\n"); | |
181 | } | |
182 | ||
183 | /* This is the implementation of trace_file_write_ops method | |
184 | write_uploaded_tsv. */ | |
185 | ||
186 | static void | |
187 | tfile_write_uploaded_tsv (struct trace_file_writer *self, | |
188 | struct uploaded_tsv *utsv) | |
189 | { | |
190 | char *buf = ""; | |
191 | struct tfile_trace_file_writer *writer | |
192 | = (struct tfile_trace_file_writer *) self; | |
193 | ||
194 | if (utsv->name) | |
195 | { | |
196 | buf = (char *) xmalloc (strlen (utsv->name) * 2 + 1); | |
197 | bin2hex ((gdb_byte *) (utsv->name), buf, strlen (utsv->name)); | |
198 | } | |
199 | ||
200 | fprintf (writer->fp, "tsv %x:%s:%x:%s\n", | |
201 | utsv->number, phex_nz (utsv->initial_value, 8), | |
202 | utsv->builtin, buf); | |
203 | ||
204 | if (utsv->name) | |
205 | xfree (buf); | |
206 | } | |
207 | ||
208 | #define MAX_TRACE_UPLOAD 2000 | |
209 | ||
210 | /* This is the implementation of trace_file_write_ops method | |
211 | write_uploaded_tp. */ | |
212 | ||
213 | static void | |
214 | tfile_write_uploaded_tp (struct trace_file_writer *self, | |
215 | struct uploaded_tp *utp) | |
216 | { | |
217 | struct tfile_trace_file_writer *writer | |
218 | = (struct tfile_trace_file_writer *) self; | |
219 | int a; | |
220 | char *act; | |
221 | char buf[MAX_TRACE_UPLOAD]; | |
222 | ||
223 | fprintf (writer->fp, "tp T%x:%s:%c:%x:%x", | |
224 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), | |
225 | (utp->enabled ? 'E' : 'D'), utp->step, utp->pass); | |
226 | if (utp->type == bp_fast_tracepoint) | |
227 | fprintf (writer->fp, ":F%x", utp->orig_size); | |
228 | if (utp->cond) | |
229 | fprintf (writer->fp, | |
230 | ":X%x,%s", (unsigned int) strlen (utp->cond) / 2, | |
231 | utp->cond); | |
232 | fprintf (writer->fp, "\n"); | |
233 | for (a = 0; VEC_iterate (char_ptr, utp->actions, a, act); ++a) | |
234 | fprintf (writer->fp, "tp A%x:%s:%s\n", | |
235 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act); | |
236 | for (a = 0; VEC_iterate (char_ptr, utp->step_actions, a, act); ++a) | |
237 | fprintf (writer->fp, "tp S%x:%s:%s\n", | |
238 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act); | |
239 | if (utp->at_string) | |
240 | { | |
241 | encode_source_string (utp->number, utp->addr, | |
242 | "at", utp->at_string, buf, MAX_TRACE_UPLOAD); | |
243 | fprintf (writer->fp, "tp Z%s\n", buf); | |
244 | } | |
245 | if (utp->cond_string) | |
246 | { | |
247 | encode_source_string (utp->number, utp->addr, | |
248 | "cond", utp->cond_string, | |
249 | buf, MAX_TRACE_UPLOAD); | |
250 | fprintf (writer->fp, "tp Z%s\n", buf); | |
251 | } | |
252 | for (a = 0; VEC_iterate (char_ptr, utp->cmd_strings, a, act); ++a) | |
253 | { | |
254 | encode_source_string (utp->number, utp->addr, "cmd", act, | |
255 | buf, MAX_TRACE_UPLOAD); | |
256 | fprintf (writer->fp, "tp Z%s\n", buf); | |
257 | } | |
258 | fprintf (writer->fp, "tp V%x:%s:%x:%s\n", | |
259 | utp->number, phex_nz (utp->addr, sizeof (utp->addr)), | |
260 | utp->hit_count, | |
261 | phex_nz (utp->traceframe_usage, | |
262 | sizeof (utp->traceframe_usage))); | |
263 | } | |
264 | ||
265 | /* This is the implementation of trace_file_write_ops method | |
266 | write_definition_end. */ | |
267 | ||
268 | static void | |
269 | tfile_write_definition_end (struct trace_file_writer *self) | |
270 | { | |
271 | struct tfile_trace_file_writer *writer | |
272 | = (struct tfile_trace_file_writer *) self; | |
273 | ||
274 | fprintf (writer->fp, "\n"); | |
275 | } | |
276 | ||
277 | /* This is the implementation of trace_file_write_ops method | |
278 | write_raw_data. */ | |
279 | ||
280 | static void | |
281 | tfile_write_raw_data (struct trace_file_writer *self, gdb_byte *buf, | |
282 | LONGEST len) | |
283 | { | |
284 | struct tfile_trace_file_writer *writer | |
285 | = (struct tfile_trace_file_writer *) self; | |
286 | ||
287 | if (fwrite (buf, len, 1, writer->fp) < 1) | |
288 | perror_with_name (writer->pathname); | |
289 | } | |
290 | ||
291 | /* This is the implementation of trace_file_write_ops method | |
292 | end. */ | |
293 | ||
294 | static void | |
295 | tfile_end (struct trace_file_writer *self) | |
296 | { | |
297 | struct tfile_trace_file_writer *writer | |
298 | = (struct tfile_trace_file_writer *) self; | |
299 | uint32_t gotten = 0; | |
300 | ||
301 | /* Mark the end of trace data. */ | |
302 | if (fwrite (&gotten, 4, 1, writer->fp) < 1) | |
303 | perror_with_name (writer->pathname); | |
304 | } | |
305 | ||
306 | /* Operations to write trace buffers into TFILE format. */ | |
307 | ||
308 | static const struct trace_file_write_ops tfile_write_ops = | |
309 | { | |
310 | tfile_dtor, | |
311 | tfile_target_save, | |
312 | tfile_start, | |
313 | tfile_write_header, | |
314 | tfile_write_regblock_type, | |
315 | tfile_write_status, | |
316 | tfile_write_uploaded_tsv, | |
317 | tfile_write_uploaded_tp, | |
318 | tfile_write_definition_end, | |
319 | tfile_write_raw_data, | |
320 | NULL, | |
321 | tfile_end, | |
322 | }; | |
323 | ||
324 | /* Return a trace writer for TFILE format. */ | |
325 | ||
326 | struct trace_file_writer * | |
327 | tfile_trace_file_writer_new (void) | |
328 | { | |
329 | struct tfile_trace_file_writer *writer | |
330 | = xmalloc (sizeof (struct tfile_trace_file_writer)); | |
331 | ||
332 | writer->base.ops = &tfile_write_ops; | |
333 | writer->fp = NULL; | |
334 | writer->pathname = NULL; | |
335 | ||
336 | return (struct trace_file_writer *) writer; | |
337 | } | |
11395323 YQ |
338 | |
339 | /* target tfile command */ | |
340 | ||
341 | static struct target_ops tfile_ops; | |
342 | ||
343 | /* Fill in tfile_ops with its defined operations and properties. */ | |
344 | ||
345 | #define TRACE_HEADER_SIZE 8 | |
346 | ||
347 | #define TFILE_PID (1) | |
348 | ||
349 | static char *trace_filename; | |
350 | static int trace_fd = -1; | |
351 | static off_t trace_frames_offset; | |
352 | static off_t cur_offset; | |
353 | static int cur_data_size; | |
354 | int trace_regblock_size; | |
355 | ||
356 | static void tfile_interp_line (char *line, | |
357 | struct uploaded_tp **utpp, | |
358 | struct uploaded_tsv **utsvp); | |
359 | ||
360 | /* Read SIZE bytes into READBUF from the trace frame, starting at | |
361 | TRACE_FD's current position. Note that this call `read' | |
362 | underneath, hence it advances the file's seek position. Throws an | |
363 | error if the `read' syscall fails, or less than SIZE bytes are | |
364 | read. */ | |
365 | ||
366 | static void | |
367 | tfile_read (gdb_byte *readbuf, int size) | |
368 | { | |
369 | int gotten; | |
370 | ||
371 | gotten = read (trace_fd, readbuf, size); | |
372 | if (gotten < 0) | |
373 | perror_with_name (trace_filename); | |
374 | else if (gotten < size) | |
375 | error (_("Premature end of file while reading trace file")); | |
376 | } | |
377 | ||
378 | static void | |
014f9477 | 379 | tfile_open (const char *arg, int from_tty) |
11395323 | 380 | { |
11395323 YQ |
381 | char *temp; |
382 | struct cleanup *old_chain; | |
383 | int flags; | |
384 | int scratch_chan; | |
385 | char header[TRACE_HEADER_SIZE]; | |
386 | char linebuf[1000]; /* Should be max remote packet size or so. */ | |
387 | gdb_byte byte; | |
388 | int bytes, i; | |
389 | struct trace_status *ts; | |
390 | struct uploaded_tp *uploaded_tps = NULL; | |
391 | struct uploaded_tsv *uploaded_tsvs = NULL; | |
014f9477 | 392 | char *filename; |
11395323 YQ |
393 | |
394 | target_preopen (from_tty); | |
014f9477 | 395 | if (!arg) |
11395323 YQ |
396 | error (_("No trace file specified.")); |
397 | ||
014f9477 | 398 | filename = tilde_expand (arg); |
11395323 YQ |
399 | if (!IS_ABSOLUTE_PATH(filename)) |
400 | { | |
401 | temp = concat (current_directory, "/", filename, (char *) NULL); | |
402 | xfree (filename); | |
403 | filename = temp; | |
404 | } | |
405 | ||
406 | old_chain = make_cleanup (xfree, filename); | |
407 | ||
408 | flags = O_BINARY | O_LARGEFILE; | |
409 | flags |= O_RDONLY; | |
410 | scratch_chan = gdb_open_cloexec (filename, flags, 0); | |
411 | if (scratch_chan < 0) | |
412 | perror_with_name (filename); | |
413 | ||
414 | /* Looks semi-reasonable. Toss the old trace file and work on the new. */ | |
415 | ||
416 | discard_cleanups (old_chain); /* Don't free filename any more. */ | |
417 | unpush_target (&tfile_ops); | |
418 | ||
419 | trace_filename = xstrdup (filename); | |
420 | trace_fd = scratch_chan; | |
421 | ||
422 | bytes = 0; | |
423 | /* Read the file header and test for validity. */ | |
424 | tfile_read ((gdb_byte *) &header, TRACE_HEADER_SIZE); | |
425 | ||
426 | bytes += TRACE_HEADER_SIZE; | |
427 | if (!(header[0] == 0x7f | |
61012eef | 428 | && (startswith (header + 1, "TRACE0\n")))) |
11395323 YQ |
429 | error (_("File is not a valid trace file.")); |
430 | ||
431 | push_target (&tfile_ops); | |
432 | ||
433 | trace_regblock_size = 0; | |
434 | ts = current_trace_status (); | |
435 | /* We know we're working with a file. Record its name. */ | |
436 | ts->filename = trace_filename; | |
437 | /* Set defaults in case there is no status line. */ | |
438 | ts->running_known = 0; | |
439 | ts->stop_reason = trace_stop_reason_unknown; | |
440 | ts->traceframe_count = -1; | |
441 | ts->buffer_free = 0; | |
442 | ts->disconnected_tracing = 0; | |
443 | ts->circular_buffer = 0; | |
444 | ||
492d29ea | 445 | TRY |
11395323 YQ |
446 | { |
447 | /* Read through a section of newline-terminated lines that | |
448 | define things like tracepoints. */ | |
449 | i = 0; | |
450 | while (1) | |
451 | { | |
452 | tfile_read (&byte, 1); | |
453 | ||
454 | ++bytes; | |
455 | if (byte == '\n') | |
456 | { | |
457 | /* Empty line marks end of the definition section. */ | |
458 | if (i == 0) | |
459 | break; | |
460 | linebuf[i] = '\0'; | |
461 | i = 0; | |
462 | tfile_interp_line (linebuf, &uploaded_tps, &uploaded_tsvs); | |
463 | } | |
464 | else | |
465 | linebuf[i++] = byte; | |
466 | if (i >= 1000) | |
467 | error (_("Excessively long lines in trace file")); | |
468 | } | |
469 | ||
470 | /* Record the starting offset of the binary trace data. */ | |
471 | trace_frames_offset = bytes; | |
472 | ||
473 | /* If we don't have a blocksize, we can't interpret the | |
474 | traceframes. */ | |
475 | if (trace_regblock_size == 0) | |
476 | error (_("No register block size recorded in trace file")); | |
477 | } | |
492d29ea | 478 | CATCH (ex, RETURN_MASK_ALL) |
11395323 YQ |
479 | { |
480 | /* Remove the partially set up target. */ | |
481 | unpush_target (&tfile_ops); | |
482 | throw_exception (ex); | |
483 | } | |
492d29ea | 484 | END_CATCH |
11395323 YQ |
485 | |
486 | inferior_appeared (current_inferior (), TFILE_PID); | |
487 | inferior_ptid = pid_to_ptid (TFILE_PID); | |
488 | add_thread_silent (inferior_ptid); | |
489 | ||
490 | if (ts->traceframe_count <= 0) | |
491 | warning (_("No traceframes present in this file.")); | |
492 | ||
493 | /* Add the file's tracepoints and variables into the current mix. */ | |
494 | ||
495 | /* Get trace state variables first, they may be checked when parsing | |
496 | uploaded commands. */ | |
497 | merge_uploaded_trace_state_variables (&uploaded_tsvs); | |
498 | ||
499 | merge_uploaded_tracepoints (&uploaded_tps); | |
500 | ||
501 | post_create_inferior (&tfile_ops, from_tty); | |
502 | } | |
503 | ||
504 | /* Interpret the given line from the definitions part of the trace | |
505 | file. */ | |
506 | ||
507 | static void | |
508 | tfile_interp_line (char *line, struct uploaded_tp **utpp, | |
509 | struct uploaded_tsv **utsvp) | |
510 | { | |
511 | char *p = line; | |
512 | ||
61012eef | 513 | if (startswith (p, "R ")) |
11395323 YQ |
514 | { |
515 | p += strlen ("R "); | |
516 | trace_regblock_size = strtol (p, &p, 16); | |
517 | } | |
61012eef | 518 | else if (startswith (p, "status ")) |
11395323 YQ |
519 | { |
520 | p += strlen ("status "); | |
521 | parse_trace_status (p, current_trace_status ()); | |
522 | } | |
61012eef | 523 | else if (startswith (p, "tp ")) |
11395323 YQ |
524 | { |
525 | p += strlen ("tp "); | |
526 | parse_tracepoint_definition (p, utpp); | |
527 | } | |
61012eef | 528 | else if (startswith (p, "tsv ")) |
11395323 YQ |
529 | { |
530 | p += strlen ("tsv "); | |
531 | parse_tsv_definition (p, utsvp); | |
532 | } | |
533 | else | |
534 | warning (_("Ignoring trace file definition \"%s\""), line); | |
535 | } | |
536 | ||
537 | /* Close the trace file and generally clean up. */ | |
538 | ||
539 | static void | |
540 | tfile_close (struct target_ops *self) | |
541 | { | |
542 | int pid; | |
543 | ||
544 | if (trace_fd < 0) | |
545 | return; | |
546 | ||
547 | pid = ptid_get_pid (inferior_ptid); | |
548 | inferior_ptid = null_ptid; /* Avoid confusion from thread stuff. */ | |
549 | exit_inferior_silent (pid); | |
550 | ||
551 | close (trace_fd); | |
552 | trace_fd = -1; | |
553 | xfree (trace_filename); | |
554 | trace_filename = NULL; | |
555 | ||
556 | trace_reset_local_state (); | |
557 | } | |
558 | ||
559 | static void | |
560 | tfile_files_info (struct target_ops *t) | |
561 | { | |
562 | printf_filtered ("\t`%s'\n", trace_filename); | |
563 | } | |
564 | ||
11395323 YQ |
565 | static void |
566 | tfile_get_tracepoint_status (struct target_ops *self, | |
567 | struct breakpoint *tp, struct uploaded_tp *utp) | |
568 | { | |
569 | /* Other bits of trace status were collected as part of opening the | |
570 | trace files, so nothing to do here. */ | |
571 | } | |
572 | ||
573 | /* Given the position of a traceframe in the file, figure out what | |
574 | address the frame was collected at. This would normally be the | |
575 | value of a collected PC register, but if not available, we | |
576 | improvise. */ | |
577 | ||
578 | static CORE_ADDR | |
579 | tfile_get_traceframe_address (off_t tframe_offset) | |
580 | { | |
581 | CORE_ADDR addr = 0; | |
582 | short tpnum; | |
583 | struct tracepoint *tp; | |
584 | off_t saved_offset = cur_offset; | |
585 | ||
586 | /* FIXME dig pc out of collected registers. */ | |
587 | ||
588 | /* Fall back to using tracepoint address. */ | |
589 | lseek (trace_fd, tframe_offset, SEEK_SET); | |
590 | tfile_read ((gdb_byte *) &tpnum, 2); | |
591 | tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, | |
592 | gdbarch_byte_order | |
593 | (target_gdbarch ())); | |
594 | ||
595 | tp = get_tracepoint_by_number_on_target (tpnum); | |
596 | /* FIXME this is a poor heuristic if multiple locations. */ | |
597 | if (tp && tp->base.loc) | |
598 | addr = tp->base.loc->address; | |
599 | ||
600 | /* Restore our seek position. */ | |
601 | cur_offset = saved_offset; | |
602 | lseek (trace_fd, cur_offset, SEEK_SET); | |
603 | return addr; | |
604 | } | |
605 | ||
606 | /* Given a type of search and some parameters, scan the collection of | |
607 | traceframes in the file looking for a match. When found, return | |
608 | both the traceframe and tracepoint number, otherwise -1 for | |
609 | each. */ | |
610 | ||
611 | static int | |
612 | tfile_trace_find (struct target_ops *self, enum trace_find_type type, int num, | |
613 | CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) | |
614 | { | |
615 | short tpnum; | |
616 | int tfnum = 0, found = 0; | |
617 | unsigned int data_size; | |
618 | struct tracepoint *tp; | |
619 | off_t offset, tframe_offset; | |
620 | CORE_ADDR tfaddr; | |
621 | ||
622 | if (num == -1) | |
623 | { | |
624 | if (tpp) | |
625 | *tpp = -1; | |
626 | return -1; | |
627 | } | |
628 | ||
629 | lseek (trace_fd, trace_frames_offset, SEEK_SET); | |
630 | offset = trace_frames_offset; | |
631 | while (1) | |
632 | { | |
633 | tframe_offset = offset; | |
634 | tfile_read ((gdb_byte *) &tpnum, 2); | |
635 | tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, | |
636 | gdbarch_byte_order | |
637 | (target_gdbarch ())); | |
638 | offset += 2; | |
639 | if (tpnum == 0) | |
640 | break; | |
641 | tfile_read ((gdb_byte *) &data_size, 4); | |
642 | data_size = (unsigned int) extract_unsigned_integer | |
643 | ((gdb_byte *) &data_size, 4, | |
644 | gdbarch_byte_order (target_gdbarch ())); | |
645 | offset += 4; | |
646 | ||
647 | if (type == tfind_number) | |
648 | { | |
649 | /* Looking for a specific trace frame. */ | |
650 | if (tfnum == num) | |
651 | found = 1; | |
652 | } | |
653 | else | |
654 | { | |
655 | /* Start from the _next_ trace frame. */ | |
656 | if (tfnum > get_traceframe_number ()) | |
657 | { | |
658 | switch (type) | |
659 | { | |
660 | case tfind_pc: | |
661 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
662 | if (tfaddr == addr1) | |
663 | found = 1; | |
664 | break; | |
665 | case tfind_tp: | |
666 | tp = get_tracepoint (num); | |
667 | if (tp && tpnum == tp->number_on_target) | |
668 | found = 1; | |
669 | break; | |
670 | case tfind_range: | |
671 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
672 | if (addr1 <= tfaddr && tfaddr <= addr2) | |
673 | found = 1; | |
674 | break; | |
675 | case tfind_outside: | |
676 | tfaddr = tfile_get_traceframe_address (tframe_offset); | |
677 | if (!(addr1 <= tfaddr && tfaddr <= addr2)) | |
678 | found = 1; | |
679 | break; | |
680 | default: | |
681 | internal_error (__FILE__, __LINE__, _("unknown tfind type")); | |
682 | } | |
683 | } | |
684 | } | |
685 | ||
686 | if (found) | |
687 | { | |
688 | if (tpp) | |
689 | *tpp = tpnum; | |
690 | cur_offset = offset; | |
691 | cur_data_size = data_size; | |
692 | ||
693 | return tfnum; | |
694 | } | |
695 | /* Skip past the traceframe's data. */ | |
696 | lseek (trace_fd, data_size, SEEK_CUR); | |
697 | offset += data_size; | |
698 | /* Update our own count of traceframes. */ | |
699 | ++tfnum; | |
700 | } | |
701 | /* Did not find what we were looking for. */ | |
702 | if (tpp) | |
703 | *tpp = -1; | |
704 | return -1; | |
705 | } | |
706 | ||
707 | /* Prototype of the callback passed to tframe_walk_blocks. */ | |
708 | typedef int (*walk_blocks_callback_func) (char blocktype, void *data); | |
709 | ||
710 | /* Callback for traceframe_walk_blocks, used to find a given block | |
711 | type in a traceframe. */ | |
712 | ||
713 | static int | |
714 | match_blocktype (char blocktype, void *data) | |
715 | { | |
716 | char *wantedp = data; | |
717 | ||
718 | if (*wantedp == blocktype) | |
719 | return 1; | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | /* Walk over all traceframe block starting at POS offset from | |
725 | CUR_OFFSET, and call CALLBACK for each block found, passing in DATA | |
726 | unmodified. If CALLBACK returns true, this returns the position in | |
727 | the traceframe where the block is found, relative to the start of | |
728 | the traceframe (cur_offset). Returns -1 if no callback call | |
729 | returned true, indicating that all blocks have been walked. */ | |
730 | ||
731 | static int | |
732 | traceframe_walk_blocks (walk_blocks_callback_func callback, | |
733 | int pos, void *data) | |
734 | { | |
735 | /* Iterate through a traceframe's blocks, looking for a block of the | |
736 | requested type. */ | |
737 | ||
738 | lseek (trace_fd, cur_offset + pos, SEEK_SET); | |
739 | while (pos < cur_data_size) | |
740 | { | |
741 | unsigned short mlen; | |
742 | char block_type; | |
743 | ||
744 | tfile_read ((gdb_byte *) &block_type, 1); | |
745 | ||
746 | ++pos; | |
747 | ||
748 | if ((*callback) (block_type, data)) | |
749 | return pos; | |
750 | ||
751 | switch (block_type) | |
752 | { | |
753 | case 'R': | |
754 | lseek (trace_fd, cur_offset + pos + trace_regblock_size, SEEK_SET); | |
755 | pos += trace_regblock_size; | |
756 | break; | |
757 | case 'M': | |
758 | lseek (trace_fd, cur_offset + pos + 8, SEEK_SET); | |
759 | tfile_read ((gdb_byte *) &mlen, 2); | |
760 | mlen = (unsigned short) | |
761 | extract_unsigned_integer ((gdb_byte *) &mlen, 2, | |
762 | gdbarch_byte_order | |
763 | (target_gdbarch ())); | |
764 | lseek (trace_fd, mlen, SEEK_CUR); | |
765 | pos += (8 + 2 + mlen); | |
766 | break; | |
767 | case 'V': | |
768 | lseek (trace_fd, cur_offset + pos + 4 + 8, SEEK_SET); | |
769 | pos += (4 + 8); | |
770 | break; | |
771 | default: | |
772 | error (_("Unknown block type '%c' (0x%x) in trace frame"), | |
773 | block_type, block_type); | |
774 | break; | |
775 | } | |
776 | } | |
777 | ||
778 | return -1; | |
779 | } | |
780 | ||
781 | /* Convenience wrapper around traceframe_walk_blocks. Looks for the | |
782 | position offset of a block of type TYPE_WANTED in the current trace | |
783 | frame, starting at POS. Returns -1 if no such block was found. */ | |
784 | ||
785 | static int | |
786 | traceframe_find_block_type (char type_wanted, int pos) | |
787 | { | |
788 | return traceframe_walk_blocks (match_blocktype, pos, &type_wanted); | |
789 | } | |
790 | ||
791 | /* Look for a block of saved registers in the traceframe, and get the | |
792 | requested register from it. */ | |
793 | ||
794 | static void | |
795 | tfile_fetch_registers (struct target_ops *ops, | |
796 | struct regcache *regcache, int regno) | |
797 | { | |
798 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
48b6e87e | 799 | int offset, regn, regsize; |
11395323 YQ |
800 | |
801 | /* An uninitialized reg size says we're not going to be | |
802 | successful at getting register blocks. */ | |
803 | if (!trace_regblock_size) | |
804 | return; | |
805 | ||
11395323 YQ |
806 | if (traceframe_find_block_type ('R', 0) >= 0) |
807 | { | |
48b6e87e YQ |
808 | gdb_byte *regs = alloca (trace_regblock_size); |
809 | ||
11395323 YQ |
810 | tfile_read (regs, trace_regblock_size); |
811 | ||
812 | /* Assume the block is laid out in GDB register number order, | |
813 | each register with the size that it has in GDB. */ | |
814 | offset = 0; | |
815 | for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++) | |
816 | { | |
817 | regsize = register_size (gdbarch, regn); | |
818 | /* Make sure we stay within block bounds. */ | |
819 | if (offset + regsize >= trace_regblock_size) | |
820 | break; | |
821 | if (regcache_register_status (regcache, regn) == REG_UNKNOWN) | |
822 | { | |
823 | if (regno == regn) | |
824 | { | |
825 | regcache_raw_supply (regcache, regno, regs + offset); | |
826 | break; | |
827 | } | |
828 | else if (regno == -1) | |
829 | { | |
830 | regcache_raw_supply (regcache, regn, regs + offset); | |
831 | } | |
832 | } | |
833 | offset += regsize; | |
834 | } | |
11395323 | 835 | } |
48b6e87e YQ |
836 | else |
837 | tracefile_fetch_registers (regcache, regno); | |
11395323 YQ |
838 | } |
839 | ||
840 | static enum target_xfer_status | |
841 | tfile_xfer_partial (struct target_ops *ops, enum target_object object, | |
842 | const char *annex, gdb_byte *readbuf, | |
843 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, | |
844 | ULONGEST *xfered_len) | |
845 | { | |
846 | /* We're only doing regular memory for now. */ | |
847 | if (object != TARGET_OBJECT_MEMORY) | |
848 | return TARGET_XFER_E_IO; | |
849 | ||
850 | if (readbuf == NULL) | |
851 | error (_("tfile_xfer_partial: trace file is read-only")); | |
852 | ||
853 | if (get_traceframe_number () != -1) | |
854 | { | |
855 | int pos = 0; | |
8acf9577 | 856 | enum target_xfer_status res; |
290a839c YQ |
857 | /* Records the lowest available address of all blocks that |
858 | intersects the requested range. */ | |
859 | ULONGEST low_addr_available = 0; | |
11395323 YQ |
860 | |
861 | /* Iterate through the traceframe's blocks, looking for | |
862 | memory. */ | |
863 | while ((pos = traceframe_find_block_type ('M', pos)) >= 0) | |
864 | { | |
865 | ULONGEST maddr, amt; | |
866 | unsigned short mlen; | |
867 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); | |
868 | ||
869 | tfile_read ((gdb_byte *) &maddr, 8); | |
870 | maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, | |
871 | byte_order); | |
872 | tfile_read ((gdb_byte *) &mlen, 2); | |
873 | mlen = (unsigned short) | |
874 | extract_unsigned_integer ((gdb_byte *) &mlen, 2, byte_order); | |
875 | ||
876 | /* If the block includes the first part of the desired | |
877 | range, return as much it has; GDB will re-request the | |
878 | remainder, which might be in a different block of this | |
879 | trace frame. */ | |
880 | if (maddr <= offset && offset < (maddr + mlen)) | |
881 | { | |
882 | amt = (maddr + mlen) - offset; | |
883 | if (amt > len) | |
884 | amt = len; | |
885 | ||
886 | if (maddr != offset) | |
887 | lseek (trace_fd, offset - maddr, SEEK_CUR); | |
888 | tfile_read (readbuf, amt); | |
889 | *xfered_len = amt; | |
890 | return TARGET_XFER_OK; | |
891 | } | |
892 | ||
290a839c YQ |
893 | if (offset < maddr && maddr < (offset + len)) |
894 | if (low_addr_available == 0 || low_addr_available > maddr) | |
895 | low_addr_available = maddr; | |
896 | ||
11395323 YQ |
897 | /* Skip over this block. */ |
898 | pos += (8 + 2 + mlen); | |
899 | } | |
11395323 | 900 | |
8acf9577 YQ |
901 | /* Requested memory is unavailable in the context of traceframes, |
902 | and this address falls within a read-only section, fallback | |
290a839c YQ |
903 | to reading from executable, up to LOW_ADDR_AVAILABLE. */ |
904 | if (offset < low_addr_available) | |
905 | len = min (len, low_addr_available - offset); | |
8acf9577 YQ |
906 | res = exec_read_partial_read_only (readbuf, offset, len, xfered_len); |
907 | ||
908 | if (res == TARGET_XFER_OK) | |
909 | return TARGET_XFER_OK; | |
910 | else | |
911 | { | |
912 | /* No use trying further, we know some memory starting | |
913 | at MEMADDR isn't available. */ | |
914 | *xfered_len = len; | |
915 | return TARGET_XFER_UNAVAILABLE; | |
916 | } | |
1ee79381 YQ |
917 | } |
918 | else | |
919 | { | |
920 | /* Fallback to reading from read-only sections. */ | |
921 | return section_table_read_available_memory (readbuf, offset, len, | |
922 | xfered_len); | |
923 | } | |
11395323 YQ |
924 | } |
925 | ||
926 | /* Iterate through the blocks of a trace frame, looking for a 'V' | |
927 | block with a matching tsv number. */ | |
928 | ||
929 | static int | |
930 | tfile_get_trace_state_variable_value (struct target_ops *self, | |
931 | int tsvnum, LONGEST *val) | |
932 | { | |
933 | int pos; | |
934 | int found = 0; | |
935 | ||
936 | /* Iterate over blocks in current frame and find the last 'V' | |
937 | block in which tsv number is TSVNUM. In one trace frame, there | |
938 | may be multiple 'V' blocks created for a given trace variable, | |
939 | and the last matched 'V' block contains the updated value. */ | |
940 | pos = 0; | |
941 | while ((pos = traceframe_find_block_type ('V', pos)) >= 0) | |
942 | { | |
943 | int vnum; | |
944 | ||
945 | tfile_read ((gdb_byte *) &vnum, 4); | |
946 | vnum = (int) extract_signed_integer ((gdb_byte *) &vnum, 4, | |
947 | gdbarch_byte_order | |
948 | (target_gdbarch ())); | |
949 | if (tsvnum == vnum) | |
950 | { | |
951 | tfile_read ((gdb_byte *) val, 8); | |
952 | *val = extract_signed_integer ((gdb_byte *) val, 8, | |
953 | gdbarch_byte_order | |
954 | (target_gdbarch ())); | |
955 | found = 1; | |
956 | } | |
957 | pos += (4 + 8); | |
958 | } | |
959 | ||
960 | return found; | |
961 | } | |
962 | ||
11395323 YQ |
963 | /* Callback for traceframe_walk_blocks. Builds a traceframe_info |
964 | object for the tfile target's current traceframe. */ | |
965 | ||
966 | static int | |
967 | build_traceframe_info (char blocktype, void *data) | |
968 | { | |
969 | struct traceframe_info *info = data; | |
970 | ||
971 | switch (blocktype) | |
972 | { | |
973 | case 'M': | |
974 | { | |
975 | struct mem_range *r; | |
976 | ULONGEST maddr; | |
977 | unsigned short mlen; | |
978 | ||
979 | tfile_read ((gdb_byte *) &maddr, 8); | |
980 | maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, | |
981 | gdbarch_byte_order | |
982 | (target_gdbarch ())); | |
983 | tfile_read ((gdb_byte *) &mlen, 2); | |
984 | mlen = (unsigned short) | |
985 | extract_unsigned_integer ((gdb_byte *) &mlen, | |
986 | 2, gdbarch_byte_order | |
987 | (target_gdbarch ())); | |
988 | ||
989 | r = VEC_safe_push (mem_range_s, info->memory, NULL); | |
990 | ||
991 | r->start = maddr; | |
992 | r->length = mlen; | |
993 | break; | |
994 | } | |
995 | case 'V': | |
996 | { | |
997 | int vnum; | |
998 | ||
999 | tfile_read ((gdb_byte *) &vnum, 4); | |
1000 | VEC_safe_push (int, info->tvars, vnum); | |
1001 | } | |
1002 | case 'R': | |
1003 | case 'S': | |
1004 | { | |
1005 | break; | |
1006 | } | |
1007 | default: | |
1008 | warning (_("Unhandled trace block type (%d) '%c ' " | |
1009 | "while building trace frame info."), | |
1010 | blocktype, blocktype); | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | static struct traceframe_info * | |
1018 | tfile_traceframe_info (struct target_ops *self) | |
1019 | { | |
1020 | struct traceframe_info *info = XCNEW (struct traceframe_info); | |
1021 | ||
1022 | traceframe_walk_blocks (build_traceframe_info, 0, info); | |
1023 | return info; | |
1024 | } | |
1025 | ||
1026 | static void | |
1027 | init_tfile_ops (void) | |
1028 | { | |
12e03cd0 YQ |
1029 | init_tracefile_ops (&tfile_ops); |
1030 | ||
11395323 YQ |
1031 | tfile_ops.to_shortname = "tfile"; |
1032 | tfile_ops.to_longname = "Local trace dump file"; | |
1033 | tfile_ops.to_doc | |
1034 | = "Use a trace file as a target. Specify the filename of the trace file."; | |
1035 | tfile_ops.to_open = tfile_open; | |
1036 | tfile_ops.to_close = tfile_close; | |
1037 | tfile_ops.to_fetch_registers = tfile_fetch_registers; | |
1038 | tfile_ops.to_xfer_partial = tfile_xfer_partial; | |
1039 | tfile_ops.to_files_info = tfile_files_info; | |
11395323 YQ |
1040 | tfile_ops.to_get_tracepoint_status = tfile_get_tracepoint_status; |
1041 | tfile_ops.to_trace_find = tfile_trace_find; | |
1042 | tfile_ops.to_get_trace_state_variable_value | |
1043 | = tfile_get_trace_state_variable_value; | |
11395323 | 1044 | tfile_ops.to_traceframe_info = tfile_traceframe_info; |
11395323 YQ |
1045 | } |
1046 | ||
1047 | extern initialize_file_ftype _initialize_tracefile_tfile; | |
1048 | ||
1049 | void | |
1050 | _initialize_tracefile_tfile (void) | |
1051 | { | |
1052 | init_tfile_ops (); | |
1053 | ||
1054 | add_target_with_completer (&tfile_ops, filename_completer); | |
1055 | } |