1 /* Trace file TFILE format support in GDB.
3 Copyright (C) 1997-2018 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
21 #include "tracefile.h"
22 #include "readline/tilde.h"
23 #include "filestuff.h"
24 #include "rsp-low.h" /* bin2hex */
27 #include "gdbthread.h"
28 #include "exec.h" /* exec_bfd */
29 #include "completer.h"
30 #include "filenames.h"
32 #include "xml-tdesc.h"
33 #include "target-descriptions.h"
41 /* The tfile target. */
43 class tfile_target final : public tracefile_target
46 const char *shortname () override
49 const char *longname () override
50 { return _("Local trace dump file"); }
52 const char *doc () override
55 Use a trace file as a target. Specify the filename of the trace file.");
58 void open (const char *, int) override;
59 void close () override;
60 void fetch_registers (struct regcache *, int) override;
61 enum target_xfer_status xfer_partial (enum target_object object,
64 const gdb_byte *writebuf,
65 ULONGEST offset, ULONGEST len,
66 ULONGEST *xfered_len) override;
67 void files_info () override;
68 int trace_find (enum trace_find_type type, int num,
69 CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) override;
70 int get_trace_state_variable_value (int tsv, LONGEST *val) override;
71 traceframe_info_up traceframe_info () override;
73 void get_tracepoint_status (struct breakpoint *tp,
74 struct uploaded_tp *utp) override;
77 /* TFILE trace writer. */
79 struct tfile_trace_file_writer
81 struct trace_file_writer base;
83 /* File pointer to tfile trace file. */
85 /* Path name of the tfile trace file. */
89 /* This is the implementation of trace_file_write_ops method
90 target_save. We just call the generic target
91 target_save_trace_data to do target-side saving. */
94 tfile_target_save (struct trace_file_writer *self,
97 int err = target_save_trace_data (filename);
102 /* This is the implementation of trace_file_write_ops method
106 tfile_dtor (struct trace_file_writer *self)
108 struct tfile_trace_file_writer *writer
109 = (struct tfile_trace_file_writer *) self;
111 xfree (writer->pathname);
113 if (writer->fp != NULL)
117 /* This is the implementation of trace_file_write_ops method
118 start. It creates the trace file FILENAME and registers some
122 tfile_start (struct trace_file_writer *self, const char *filename)
124 struct tfile_trace_file_writer *writer
125 = (struct tfile_trace_file_writer *) self;
127 writer->pathname = tilde_expand (filename);
128 writer->fp = gdb_fopen_cloexec (writer->pathname, "wb").release ();
129 if (writer->fp == NULL)
130 error (_("Unable to open file '%s' for saving trace data (%s)"),
131 writer->pathname, safe_strerror (errno));
134 /* This is the implementation of trace_file_write_ops method
135 write_header. Write the TFILE header. */
138 tfile_write_header (struct trace_file_writer *self)
140 struct tfile_trace_file_writer *writer
141 = (struct tfile_trace_file_writer *) self;
144 /* Write a file header, with a high-bit-set char to indicate a
145 binary file, plus a hint as what this file is, and a version
146 number in case of future needs. */
147 written = fwrite ("\x7fTRACE0\n", 8, 1, writer->fp);
149 perror_with_name (writer->pathname);
152 /* This is the implementation of trace_file_write_ops method
153 write_regblock_type. Write the size of register block. */
156 tfile_write_regblock_type (struct trace_file_writer *self, int size)
158 struct tfile_trace_file_writer *writer
159 = (struct tfile_trace_file_writer *) self;
161 fprintf (writer->fp, "R %x\n", size);
164 /* This is the implementation of trace_file_write_ops method
168 tfile_write_status (struct trace_file_writer *self,
169 struct trace_status *ts)
171 struct tfile_trace_file_writer *writer
172 = (struct tfile_trace_file_writer *) self;
174 fprintf (writer->fp, "status %c;%s",
175 (ts->running ? '1' : '0'), stop_reason_names[ts->stop_reason]);
176 if (ts->stop_reason == tracepoint_error
177 || ts->stop_reason == trace_stop_command)
179 char *buf = (char *) alloca (strlen (ts->stop_desc) * 2 + 1);
181 bin2hex ((gdb_byte *) ts->stop_desc, buf, strlen (ts->stop_desc));
182 fprintf (writer->fp, ":%s", buf);
184 fprintf (writer->fp, ":%x", ts->stopping_tracepoint);
185 if (ts->traceframe_count >= 0)
186 fprintf (writer->fp, ";tframes:%x", ts->traceframe_count);
187 if (ts->traceframes_created >= 0)
188 fprintf (writer->fp, ";tcreated:%x", ts->traceframes_created);
189 if (ts->buffer_free >= 0)
190 fprintf (writer->fp, ";tfree:%x", ts->buffer_free);
191 if (ts->buffer_size >= 0)
192 fprintf (writer->fp, ";tsize:%x", ts->buffer_size);
193 if (ts->disconnected_tracing)
194 fprintf (writer->fp, ";disconn:%x", ts->disconnected_tracing);
195 if (ts->circular_buffer)
196 fprintf (writer->fp, ";circular:%x", ts->circular_buffer);
199 fprintf (writer->fp, ";starttime:%s",
200 phex_nz (ts->start_time, sizeof (ts->start_time)));
204 fprintf (writer->fp, ";stoptime:%s",
205 phex_nz (ts->stop_time, sizeof (ts->stop_time)));
207 if (ts->notes != NULL)
209 char *buf = (char *) alloca (strlen (ts->notes) * 2 + 1);
211 bin2hex ((gdb_byte *) ts->notes, buf, strlen (ts->notes));
212 fprintf (writer->fp, ";notes:%s", buf);
214 if (ts->user_name != NULL)
216 char *buf = (char *) alloca (strlen (ts->user_name) * 2 + 1);
218 bin2hex ((gdb_byte *) ts->user_name, buf, strlen (ts->user_name));
219 fprintf (writer->fp, ";username:%s", buf);
221 fprintf (writer->fp, "\n");
224 /* This is the implementation of trace_file_write_ops method
225 write_uploaded_tsv. */
228 tfile_write_uploaded_tsv (struct trace_file_writer *self,
229 struct uploaded_tsv *utsv)
232 struct tfile_trace_file_writer *writer
233 = (struct tfile_trace_file_writer *) self;
237 buf = (char *) xmalloc (strlen (utsv->name) * 2 + 1);
238 bin2hex ((gdb_byte *) (utsv->name), buf, strlen (utsv->name));
241 fprintf (writer->fp, "tsv %x:%s:%x:%s\n",
242 utsv->number, phex_nz (utsv->initial_value, 8),
243 utsv->builtin, buf != NULL ? buf : "");
249 #define MAX_TRACE_UPLOAD 2000
251 /* This is the implementation of trace_file_write_ops method
252 write_uploaded_tp. */
255 tfile_write_uploaded_tp (struct trace_file_writer *self,
256 struct uploaded_tp *utp)
258 struct tfile_trace_file_writer *writer
259 = (struct tfile_trace_file_writer *) self;
260 char buf[MAX_TRACE_UPLOAD];
262 fprintf (writer->fp, "tp T%x:%s:%c:%x:%x",
263 utp->number, phex_nz (utp->addr, sizeof (utp->addr)),
264 (utp->enabled ? 'E' : 'D'), utp->step, utp->pass);
265 if (utp->type == bp_fast_tracepoint)
266 fprintf (writer->fp, ":F%x", utp->orig_size);
269 ":X%x,%s", (unsigned int) strlen (utp->cond) / 2,
271 fprintf (writer->fp, "\n");
272 for (char *act : utp->actions)
273 fprintf (writer->fp, "tp A%x:%s:%s\n",
274 utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act);
275 for (char *act : utp->step_actions)
276 fprintf (writer->fp, "tp S%x:%s:%s\n",
277 utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act);
280 encode_source_string (utp->number, utp->addr,
281 "at", utp->at_string, buf, MAX_TRACE_UPLOAD);
282 fprintf (writer->fp, "tp Z%s\n", buf);
284 if (utp->cond_string)
286 encode_source_string (utp->number, utp->addr,
287 "cond", utp->cond_string,
288 buf, MAX_TRACE_UPLOAD);
289 fprintf (writer->fp, "tp Z%s\n", buf);
291 for (char *act : utp->cmd_strings)
293 encode_source_string (utp->number, utp->addr, "cmd", act,
294 buf, MAX_TRACE_UPLOAD);
295 fprintf (writer->fp, "tp Z%s\n", buf);
297 fprintf (writer->fp, "tp V%x:%s:%x:%s\n",
298 utp->number, phex_nz (utp->addr, sizeof (utp->addr)),
300 phex_nz (utp->traceframe_usage,
301 sizeof (utp->traceframe_usage)));
304 /* This is the implementation of trace_file_write_ops method
308 tfile_write_tdesc (struct trace_file_writer *self)
310 struct tfile_trace_file_writer *writer
311 = (struct tfile_trace_file_writer *) self;
313 gdb::optional<std::string> tdesc
314 = target_fetch_description_xml (target_stack);
319 const char *ptr = tdesc->c_str ();
321 /* Write tdesc line by line, prefixing each line with "tdesc ". */
324 const char *next = strchr (ptr, '\n');
327 fprintf (writer->fp, "tdesc %.*s\n", (int) (next - ptr), ptr);
331 else if (*ptr != '\0')
333 /* Last line, doesn't have a newline. */
334 fprintf (writer->fp, "tdesc %s\n", ptr);
340 /* This is the implementation of trace_file_write_ops method
341 write_definition_end. */
344 tfile_write_definition_end (struct trace_file_writer *self)
346 struct tfile_trace_file_writer *writer
347 = (struct tfile_trace_file_writer *) self;
349 fprintf (writer->fp, "\n");
352 /* This is the implementation of trace_file_write_ops method
356 tfile_write_raw_data (struct trace_file_writer *self, gdb_byte *buf,
359 struct tfile_trace_file_writer *writer
360 = (struct tfile_trace_file_writer *) self;
362 if (fwrite (buf, len, 1, writer->fp) < 1)
363 perror_with_name (writer->pathname);
366 /* This is the implementation of trace_file_write_ops method
370 tfile_end (struct trace_file_writer *self)
372 struct tfile_trace_file_writer *writer
373 = (struct tfile_trace_file_writer *) self;
376 /* Mark the end of trace data. */
377 if (fwrite (&gotten, 4, 1, writer->fp) < 1)
378 perror_with_name (writer->pathname);
381 /* Operations to write trace buffers into TFILE format. */
383 static const struct trace_file_write_ops tfile_write_ops =
389 tfile_write_regblock_type,
391 tfile_write_uploaded_tsv,
392 tfile_write_uploaded_tp,
394 tfile_write_definition_end,
395 tfile_write_raw_data,
400 /* Return a trace writer for TFILE format. */
402 struct trace_file_writer *
403 tfile_trace_file_writer_new (void)
405 struct tfile_trace_file_writer *writer
406 = XNEW (struct tfile_trace_file_writer);
408 writer->base.ops = &tfile_write_ops;
410 writer->pathname = NULL;
412 return (struct trace_file_writer *) writer;
415 /* target tfile command */
417 static tfile_target tfile_ops;
419 #define TRACE_HEADER_SIZE 8
421 #define TFILE_PID (1)
423 static char *trace_filename;
424 static int trace_fd = -1;
425 static off_t trace_frames_offset;
426 static off_t cur_offset;
427 static int cur_data_size;
428 int trace_regblock_size;
429 static struct buffer trace_tdesc;
431 static void tfile_append_tdesc_line (const char *line);
432 static void tfile_interp_line (char *line,
433 struct uploaded_tp **utpp,
434 struct uploaded_tsv **utsvp);
436 /* Read SIZE bytes into READBUF from the trace frame, starting at
437 TRACE_FD's current position. Note that this call `read'
438 underneath, hence it advances the file's seek position. Throws an
439 error if the `read' syscall fails, or less than SIZE bytes are
443 tfile_read (gdb_byte *readbuf, int size)
447 gotten = read (trace_fd, readbuf, size);
449 perror_with_name (trace_filename);
450 else if (gotten < size)
451 error (_("Premature end of file while reading trace file"));
455 tfile_target::open (const char *arg, int from_tty)
459 char header[TRACE_HEADER_SIZE];
460 char linebuf[1000]; /* Should be max remote packet size or so. */
463 struct trace_status *ts;
464 struct uploaded_tp *uploaded_tps = NULL;
465 struct uploaded_tsv *uploaded_tsvs = NULL;
467 target_preopen (from_tty);
469 error (_("No trace file specified."));
471 gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg));
472 if (!IS_ABSOLUTE_PATH (filename.get ()))
473 filename.reset (concat (current_directory, "/", filename.get (),
476 flags = O_BINARY | O_LARGEFILE;
478 scratch_chan = gdb_open_cloexec (filename.get (), flags, 0);
479 if (scratch_chan < 0)
480 perror_with_name (filename.get ());
482 /* Looks semi-reasonable. Toss the old trace file and work on the new. */
484 unpush_target (&tfile_ops);
486 trace_filename = filename.release ();
487 trace_fd = scratch_chan;
489 /* Make sure this is clear. */
490 buffer_free (&trace_tdesc);
493 /* Read the file header and test for validity. */
494 tfile_read ((gdb_byte *) &header, TRACE_HEADER_SIZE);
496 bytes += TRACE_HEADER_SIZE;
497 if (!(header[0] == 0x7f
498 && (startswith (header + 1, "TRACE0\n"))))
499 error (_("File is not a valid trace file."));
501 push_target (&tfile_ops);
503 trace_regblock_size = 0;
504 ts = current_trace_status ();
505 /* We know we're working with a file. Record its name. */
506 ts->filename = trace_filename;
507 /* Set defaults in case there is no status line. */
508 ts->running_known = 0;
509 ts->stop_reason = trace_stop_reason_unknown;
510 ts->traceframe_count = -1;
512 ts->disconnected_tracing = 0;
513 ts->circular_buffer = 0;
517 /* Read through a section of newline-terminated lines that
518 define things like tracepoints. */
522 tfile_read (&byte, 1);
527 /* Empty line marks end of the definition section. */
532 tfile_interp_line (linebuf, &uploaded_tps, &uploaded_tsvs);
537 error (_("Excessively long lines in trace file"));
540 /* By now, tdesc lines have been read from tfile - let's parse them. */
541 target_find_description ();
543 /* Record the starting offset of the binary trace data. */
544 trace_frames_offset = bytes;
546 /* If we don't have a blocksize, we can't interpret the
548 if (trace_regblock_size == 0)
549 error (_("No register block size recorded in trace file"));
551 CATCH (ex, RETURN_MASK_ALL)
553 /* Remove the partially set up target. */
554 unpush_target (&tfile_ops);
555 throw_exception (ex);
559 inferior_appeared (current_inferior (), TFILE_PID);
560 inferior_ptid = pid_to_ptid (TFILE_PID);
561 add_thread_silent (inferior_ptid);
563 if (ts->traceframe_count <= 0)
564 warning (_("No traceframes present in this file."));
566 /* Add the file's tracepoints and variables into the current mix. */
568 /* Get trace state variables first, they may be checked when parsing
569 uploaded commands. */
570 merge_uploaded_trace_state_variables (&uploaded_tsvs);
572 merge_uploaded_tracepoints (&uploaded_tps);
574 post_create_inferior (&tfile_ops, from_tty);
577 /* Interpret the given line from the definitions part of the trace
581 tfile_interp_line (char *line, struct uploaded_tp **utpp,
582 struct uploaded_tsv **utsvp)
586 if (startswith (p, "R "))
589 trace_regblock_size = strtol (p, &p, 16);
591 else if (startswith (p, "status "))
593 p += strlen ("status ");
594 parse_trace_status (p, current_trace_status ());
596 else if (startswith (p, "tp "))
599 parse_tracepoint_definition (p, utpp);
601 else if (startswith (p, "tsv "))
603 p += strlen ("tsv ");
604 parse_tsv_definition (p, utsvp);
606 else if (startswith (p, "tdesc "))
608 p += strlen ("tdesc ");
609 tfile_append_tdesc_line (p);
612 warning (_("Ignoring trace file definition \"%s\""), line);
615 /* Close the trace file and generally clean up. */
618 tfile_target::close ()
625 pid = ptid_get_pid (inferior_ptid);
626 inferior_ptid = null_ptid; /* Avoid confusion from thread stuff. */
627 exit_inferior_silent (pid);
631 xfree (trace_filename);
632 trace_filename = NULL;
633 buffer_free (&trace_tdesc);
635 trace_reset_local_state ();
639 tfile_target::files_info ()
641 printf_filtered ("\t`%s'\n", trace_filename);
645 tfile_target::get_tracepoint_status (struct breakpoint *tp, struct uploaded_tp *utp)
647 /* Other bits of trace status were collected as part of opening the
648 trace files, so nothing to do here. */
651 /* Given the position of a traceframe in the file, figure out what
652 address the frame was collected at. This would normally be the
653 value of a collected PC register, but if not available, we
657 tfile_get_traceframe_address (off_t tframe_offset)
661 struct tracepoint *tp;
662 off_t saved_offset = cur_offset;
664 /* FIXME dig pc out of collected registers. */
666 /* Fall back to using tracepoint address. */
667 lseek (trace_fd, tframe_offset, SEEK_SET);
668 tfile_read ((gdb_byte *) &tpnum, 2);
669 tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2,
671 (target_gdbarch ()));
673 tp = get_tracepoint_by_number_on_target (tpnum);
674 /* FIXME this is a poor heuristic if multiple locations. */
676 addr = tp->loc->address;
678 /* Restore our seek position. */
679 cur_offset = saved_offset;
680 lseek (trace_fd, cur_offset, SEEK_SET);
684 /* Given a type of search and some parameters, scan the collection of
685 traceframes in the file looking for a match. When found, return
686 both the traceframe and tracepoint number, otherwise -1 for
690 tfile_target::trace_find (enum trace_find_type type, int num,
691 CORE_ADDR addr1, CORE_ADDR addr2, int *tpp)
694 int tfnum = 0, found = 0;
695 unsigned int data_size;
696 struct tracepoint *tp;
697 off_t offset, tframe_offset;
707 lseek (trace_fd, trace_frames_offset, SEEK_SET);
708 offset = trace_frames_offset;
711 tframe_offset = offset;
712 tfile_read ((gdb_byte *) &tpnum, 2);
713 tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2,
715 (target_gdbarch ()));
719 tfile_read ((gdb_byte *) &data_size, 4);
720 data_size = (unsigned int) extract_unsigned_integer
721 ((gdb_byte *) &data_size, 4,
722 gdbarch_byte_order (target_gdbarch ()));
725 if (type == tfind_number)
727 /* Looking for a specific trace frame. */
733 /* Start from the _next_ trace frame. */
734 if (tfnum > get_traceframe_number ())
739 tfaddr = tfile_get_traceframe_address (tframe_offset);
744 tp = get_tracepoint (num);
745 if (tp && tpnum == tp->number_on_target)
749 tfaddr = tfile_get_traceframe_address (tframe_offset);
750 if (addr1 <= tfaddr && tfaddr <= addr2)
754 tfaddr = tfile_get_traceframe_address (tframe_offset);
755 if (!(addr1 <= tfaddr && tfaddr <= addr2))
759 internal_error (__FILE__, __LINE__, _("unknown tfind type"));
769 cur_data_size = data_size;
773 /* Skip past the traceframe's data. */
774 lseek (trace_fd, data_size, SEEK_CUR);
776 /* Update our own count of traceframes. */
779 /* Did not find what we were looking for. */
785 /* Prototype of the callback passed to tframe_walk_blocks. */
786 typedef int (*walk_blocks_callback_func) (char blocktype, void *data);
788 /* Callback for traceframe_walk_blocks, used to find a given block
789 type in a traceframe. */
792 match_blocktype (char blocktype, void *data)
794 char *wantedp = (char *) data;
796 if (*wantedp == blocktype)
802 /* Walk over all traceframe block starting at POS offset from
803 CUR_OFFSET, and call CALLBACK for each block found, passing in DATA
804 unmodified. If CALLBACK returns true, this returns the position in
805 the traceframe where the block is found, relative to the start of
806 the traceframe (cur_offset). Returns -1 if no callback call
807 returned true, indicating that all blocks have been walked. */
810 traceframe_walk_blocks (walk_blocks_callback_func callback,
813 /* Iterate through a traceframe's blocks, looking for a block of the
816 lseek (trace_fd, cur_offset + pos, SEEK_SET);
817 while (pos < cur_data_size)
822 tfile_read ((gdb_byte *) &block_type, 1);
826 if ((*callback) (block_type, data))
832 lseek (trace_fd, cur_offset + pos + trace_regblock_size, SEEK_SET);
833 pos += trace_regblock_size;
836 lseek (trace_fd, cur_offset + pos + 8, SEEK_SET);
837 tfile_read ((gdb_byte *) &mlen, 2);
838 mlen = (unsigned short)
839 extract_unsigned_integer ((gdb_byte *) &mlen, 2,
841 (target_gdbarch ()));
842 lseek (trace_fd, mlen, SEEK_CUR);
843 pos += (8 + 2 + mlen);
846 lseek (trace_fd, cur_offset + pos + 4 + 8, SEEK_SET);
850 error (_("Unknown block type '%c' (0x%x) in trace frame"),
851 block_type, block_type);
859 /* Convenience wrapper around traceframe_walk_blocks. Looks for the
860 position offset of a block of type TYPE_WANTED in the current trace
861 frame, starting at POS. Returns -1 if no such block was found. */
864 traceframe_find_block_type (char type_wanted, int pos)
866 return traceframe_walk_blocks (match_blocktype, pos, &type_wanted);
869 /* Look for a block of saved registers in the traceframe, and get the
870 requested register from it. */
873 tfile_target::fetch_registers (struct regcache *regcache, int regno)
875 struct gdbarch *gdbarch = regcache->arch ();
876 int offset, regn, regsize, dummy;
878 /* An uninitialized reg size says we're not going to be
879 successful at getting register blocks. */
880 if (!trace_regblock_size)
883 if (traceframe_find_block_type ('R', 0) >= 0)
885 gdb_byte *regs = (gdb_byte *) alloca (trace_regblock_size);
887 tfile_read (regs, trace_regblock_size);
889 for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++)
891 if (!remote_register_number_and_offset (regcache->arch (),
892 regn, &dummy, &offset))
895 regsize = register_size (gdbarch, regn);
896 /* Make sure we stay within block bounds. */
897 if (offset + regsize > trace_regblock_size)
899 if (regcache_register_status (regcache, regn) == REG_UNKNOWN)
903 regcache_raw_supply (regcache, regno, regs + offset);
906 else if (regno == -1)
908 regcache_raw_supply (regcache, regn, regs + offset);
914 tracefile_fetch_registers (regcache, regno);
917 static enum target_xfer_status
918 tfile_xfer_partial_features (const char *annex,
919 gdb_byte *readbuf, const gdb_byte *writebuf,
920 ULONGEST offset, ULONGEST len,
921 ULONGEST *xfered_len)
923 if (strcmp (annex, "target.xml"))
924 return TARGET_XFER_E_IO;
927 error (_("tfile_xfer_partial: tdesc is read-only"));
929 if (trace_tdesc.used_size == 0)
930 return TARGET_XFER_E_IO;
932 if (offset >= trace_tdesc.used_size)
933 return TARGET_XFER_EOF;
935 if (len > trace_tdesc.used_size - offset)
936 len = trace_tdesc.used_size - offset;
938 memcpy (readbuf, trace_tdesc.buffer + offset, len);
941 return TARGET_XFER_OK;
944 enum target_xfer_status
945 tfile_target::xfer_partial (enum target_object object,
946 const char *annex, gdb_byte *readbuf,
947 const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
948 ULONGEST *xfered_len)
950 /* We're only doing regular memory and tdesc for now. */
951 if (object == TARGET_OBJECT_AVAILABLE_FEATURES)
952 return tfile_xfer_partial_features (annex, readbuf, writebuf,
953 offset, len, xfered_len);
954 if (object != TARGET_OBJECT_MEMORY)
955 return TARGET_XFER_E_IO;
958 error (_("tfile_xfer_partial: trace file is read-only"));
960 if (get_traceframe_number () != -1)
963 enum target_xfer_status res;
964 /* Records the lowest available address of all blocks that
965 intersects the requested range. */
966 ULONGEST low_addr_available = 0;
968 /* Iterate through the traceframe's blocks, looking for
970 while ((pos = traceframe_find_block_type ('M', pos)) >= 0)
974 enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
976 tfile_read ((gdb_byte *) &maddr, 8);
977 maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8,
979 tfile_read ((gdb_byte *) &mlen, 2);
980 mlen = (unsigned short)
981 extract_unsigned_integer ((gdb_byte *) &mlen, 2, byte_order);
983 /* If the block includes the first part of the desired
984 range, return as much it has; GDB will re-request the
985 remainder, which might be in a different block of this
987 if (maddr <= offset && offset < (maddr + mlen))
989 amt = (maddr + mlen) - offset;
994 lseek (trace_fd, offset - maddr, SEEK_CUR);
995 tfile_read (readbuf, amt);
997 return TARGET_XFER_OK;
1000 if (offset < maddr && maddr < (offset + len))
1001 if (low_addr_available == 0 || low_addr_available > maddr)
1002 low_addr_available = maddr;
1004 /* Skip over this block. */
1005 pos += (8 + 2 + mlen);
1008 /* Requested memory is unavailable in the context of traceframes,
1009 and this address falls within a read-only section, fallback
1010 to reading from executable, up to LOW_ADDR_AVAILABLE. */
1011 if (offset < low_addr_available)
1012 len = std::min (len, low_addr_available - offset);
1013 res = exec_read_partial_read_only (readbuf, offset, len, xfered_len);
1015 if (res == TARGET_XFER_OK)
1016 return TARGET_XFER_OK;
1019 /* No use trying further, we know some memory starting
1020 at MEMADDR isn't available. */
1022 return TARGET_XFER_UNAVAILABLE;
1027 /* Fallback to reading from read-only sections. */
1028 return section_table_read_available_memory (readbuf, offset, len,
1033 /* Iterate through the blocks of a trace frame, looking for a 'V'
1034 block with a matching tsv number. */
1037 tfile_target::get_trace_state_variable_value (int tsvnum, LONGEST *val)
1042 /* Iterate over blocks in current frame and find the last 'V'
1043 block in which tsv number is TSVNUM. In one trace frame, there
1044 may be multiple 'V' blocks created for a given trace variable,
1045 and the last matched 'V' block contains the updated value. */
1047 while ((pos = traceframe_find_block_type ('V', pos)) >= 0)
1051 tfile_read ((gdb_byte *) &vnum, 4);
1052 vnum = (int) extract_signed_integer ((gdb_byte *) &vnum, 4,
1054 (target_gdbarch ()));
1057 tfile_read ((gdb_byte *) val, 8);
1058 *val = extract_signed_integer ((gdb_byte *) val, 8,
1060 (target_gdbarch ()));
1069 /* Callback for traceframe_walk_blocks. Builds a traceframe_info
1070 object for the tfile target's current traceframe. */
1073 build_traceframe_info (char blocktype, void *data)
1075 struct traceframe_info *info = (struct traceframe_info *) data;
1082 unsigned short mlen;
1084 tfile_read ((gdb_byte *) &maddr, 8);
1085 maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8,
1087 (target_gdbarch ()));
1088 tfile_read ((gdb_byte *) &mlen, 2);
1089 mlen = (unsigned short)
1090 extract_unsigned_integer ((gdb_byte *) &mlen,
1091 2, gdbarch_byte_order
1092 (target_gdbarch ()));
1094 info->memory.emplace_back (maddr, mlen);
1101 tfile_read ((gdb_byte *) &vnum, 4);
1102 info->tvars.push_back (vnum);
1110 warning (_("Unhandled trace block type (%d) '%c ' "
1111 "while building trace frame info."),
1112 blocktype, blocktype);
1120 tfile_target::traceframe_info ()
1122 traceframe_info_up info (new struct traceframe_info);
1124 traceframe_walk_blocks (build_traceframe_info, 0, info.get ());
1129 /* Handles tdesc lines from tfile by appending the payload to
1130 a global trace_tdesc variable. */
1133 tfile_append_tdesc_line (const char *line)
1135 buffer_grow_str (&trace_tdesc, line);
1136 buffer_grow_str (&trace_tdesc, "\n");
1140 _initialize_tracefile_tfile (void)
1142 add_target_with_completer (&tfile_ops, filename_completer);