| /* Trace file TFILE format support in GDB. |
| |
| Copyright (C) 1997-2024 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "extract-store-integer.h" |
| #include "tracefile.h" |
| #include "readline/tilde.h" |
| #include "gdbsupport/filestuff.h" |
| #include "gdbsupport/rsp-low.h" |
| #include "regcache.h" |
| #include "inferior.h" |
| #include "gdbthread.h" |
| #include "exec.h" |
| #include "completer.h" |
| #include "filenames.h" |
| #include "remote.h" |
| #include "xml-tdesc.h" |
| #include "target-descriptions.h" |
| #include "gdbsupport/pathstuff.h" |
| #include <algorithm> |
| |
| #ifndef O_LARGEFILE |
| #define O_LARGEFILE 0 |
| #endif |
| |
| /* The tfile target. */ |
| |
| static const target_info tfile_target_info = { |
| "tfile", |
| N_("Local trace dump file"), |
| N_("Use a trace file as a target.\n\ |
| Specify the filename of the trace file.") |
| }; |
| |
| class tfile_target final : public tracefile_target |
| { |
| public: |
| const target_info &info () const override |
| { return tfile_target_info; } |
| |
| void close () override; |
| void fetch_registers (struct regcache *, int) override; |
| enum target_xfer_status xfer_partial (enum target_object object, |
| const char *annex, |
| gdb_byte *readbuf, |
| const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) override; |
| void files_info () override; |
| int trace_find (enum trace_find_type type, int num, |
| CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) override; |
| bool get_trace_state_variable_value (int tsv, LONGEST *val) override; |
| traceframe_info_up traceframe_info () override; |
| |
| void get_tracepoint_status (tracepoint *tp, |
| struct uploaded_tp *utp) override; |
| }; |
| |
| /* TFILE trace writer. */ |
| |
| struct tfile_trace_file_writer |
| { |
| struct trace_file_writer base; |
| |
| /* File pointer to tfile trace file. */ |
| FILE *fp; |
| /* Path name of the tfile trace file. */ |
| char *pathname; |
| }; |
| |
| /* This is the implementation of trace_file_write_ops method |
| target_save. We just call the generic target |
| target_save_trace_data to do target-side saving. */ |
| |
| static int |
| tfile_target_save (struct trace_file_writer *self, |
| const char *filename) |
| { |
| int err = target_save_trace_data (filename); |
| |
| return (err >= 0); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| dtor. */ |
| |
| static void |
| tfile_dtor (struct trace_file_writer *self) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| xfree (writer->pathname); |
| |
| if (writer->fp != NULL) |
| fclose (writer->fp); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| start. It creates the trace file FILENAME and registers some |
| cleanups. */ |
| |
| static void |
| tfile_start (struct trace_file_writer *self, const char *filename) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| writer->pathname = tilde_expand (filename); |
| writer->fp = gdb_fopen_cloexec (writer->pathname, "wb").release (); |
| if (writer->fp == NULL) |
| error (_("Unable to open file '%s' for saving trace data (%s)"), |
| writer->pathname, safe_strerror (errno)); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_header. Write the TFILE header. */ |
| |
| static void |
| tfile_write_header (struct trace_file_writer *self) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| int written; |
| |
| /* Write a file header, with a high-bit-set char to indicate a |
| binary file, plus a hint as what this file is, and a version |
| number in case of future needs. */ |
| written = fwrite ("\x7fTRACE0\n", 8, 1, writer->fp); |
| if (written < 1) |
| perror_with_name (writer->pathname); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_regblock_type. Write the size of register block. */ |
| |
| static void |
| tfile_write_regblock_type (struct trace_file_writer *self, int size) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| fprintf (writer->fp, "R %x\n", size); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_status. */ |
| |
| static void |
| tfile_write_status (struct trace_file_writer *self, |
| struct trace_status *ts) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| fprintf (writer->fp, "status %c;%s", |
| (ts->running ? '1' : '0'), stop_reason_names[ts->stop_reason]); |
| if (ts->stop_reason == tracepoint_error |
| || ts->stop_reason == trace_stop_command) |
| { |
| char *buf = (char *) alloca (strlen (ts->stop_desc) * 2 + 1); |
| |
| bin2hex ((gdb_byte *) ts->stop_desc, buf, strlen (ts->stop_desc)); |
| fprintf (writer->fp, ":%s", buf); |
| } |
| fprintf (writer->fp, ":%x", ts->stopping_tracepoint); |
| if (ts->traceframe_count >= 0) |
| fprintf (writer->fp, ";tframes:%x", ts->traceframe_count); |
| if (ts->traceframes_created >= 0) |
| fprintf (writer->fp, ";tcreated:%x", ts->traceframes_created); |
| if (ts->buffer_free >= 0) |
| fprintf (writer->fp, ";tfree:%x", ts->buffer_free); |
| if (ts->buffer_size >= 0) |
| fprintf (writer->fp, ";tsize:%x", ts->buffer_size); |
| if (ts->disconnected_tracing) |
| fprintf (writer->fp, ";disconn:%x", ts->disconnected_tracing); |
| if (ts->circular_buffer) |
| fprintf (writer->fp, ";circular:%x", ts->circular_buffer); |
| if (ts->start_time) |
| { |
| fprintf (writer->fp, ";starttime:%s", |
| phex_nz (ts->start_time, sizeof (ts->start_time))); |
| } |
| if (ts->stop_time) |
| { |
| fprintf (writer->fp, ";stoptime:%s", |
| phex_nz (ts->stop_time, sizeof (ts->stop_time))); |
| } |
| if (ts->notes != NULL) |
| { |
| char *buf = (char *) alloca (strlen (ts->notes) * 2 + 1); |
| |
| bin2hex ((gdb_byte *) ts->notes, buf, strlen (ts->notes)); |
| fprintf (writer->fp, ";notes:%s", buf); |
| } |
| if (ts->user_name != NULL) |
| { |
| char *buf = (char *) alloca (strlen (ts->user_name) * 2 + 1); |
| |
| bin2hex ((gdb_byte *) ts->user_name, buf, strlen (ts->user_name)); |
| fprintf (writer->fp, ";username:%s", buf); |
| } |
| fprintf (writer->fp, "\n"); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_uploaded_tsv. */ |
| |
| static void |
| tfile_write_uploaded_tsv (struct trace_file_writer *self, |
| struct uploaded_tsv *utsv) |
| { |
| gdb::unique_xmalloc_ptr<char> buf; |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| if (utsv->name) |
| { |
| buf.reset ((char *) xmalloc (strlen (utsv->name) * 2 + 1)); |
| bin2hex ((gdb_byte *) (utsv->name), buf.get (), strlen (utsv->name)); |
| } |
| |
| fprintf (writer->fp, "tsv %x:%s:%x:%s\n", |
| utsv->number, phex_nz (utsv->initial_value, 8), |
| utsv->builtin, buf != NULL ? buf.get () : ""); |
| } |
| |
| #define MAX_TRACE_UPLOAD 2000 |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_uploaded_tp. */ |
| |
| static void |
| tfile_write_uploaded_tp (struct trace_file_writer *self, |
| struct uploaded_tp *utp) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| char buf[MAX_TRACE_UPLOAD]; |
| |
| fprintf (writer->fp, "tp T%x:%s:%c:%x:%x", |
| utp->number, phex_nz (utp->addr, sizeof (utp->addr)), |
| (utp->enabled ? 'E' : 'D'), utp->step, utp->pass); |
| if (utp->type == bp_fast_tracepoint) |
| fprintf (writer->fp, ":F%x", utp->orig_size); |
| if (utp->cond) |
| fprintf (writer->fp, |
| ":X%x,%s", (unsigned int) strlen (utp->cond.get ()) / 2, |
| utp->cond.get ()); |
| fprintf (writer->fp, "\n"); |
| for (const auto &act : utp->actions) |
| fprintf (writer->fp, "tp A%x:%s:%s\n", |
| utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act.get ()); |
| for (const auto &act : utp->step_actions) |
| fprintf (writer->fp, "tp S%x:%s:%s\n", |
| utp->number, phex_nz (utp->addr, sizeof (utp->addr)), act.get ()); |
| if (utp->at_string) |
| { |
| encode_source_string (utp->number, utp->addr, |
| "at", utp->at_string.get (), |
| buf, MAX_TRACE_UPLOAD); |
| fprintf (writer->fp, "tp Z%s\n", buf); |
| } |
| if (utp->cond_string) |
| { |
| encode_source_string (utp->number, utp->addr, |
| "cond", utp->cond_string.get (), |
| buf, MAX_TRACE_UPLOAD); |
| fprintf (writer->fp, "tp Z%s\n", buf); |
| } |
| for (const auto &act : utp->cmd_strings) |
| { |
| encode_source_string (utp->number, utp->addr, "cmd", act.get (), |
| buf, MAX_TRACE_UPLOAD); |
| fprintf (writer->fp, "tp Z%s\n", buf); |
| } |
| fprintf (writer->fp, "tp V%x:%s:%x:%s\n", |
| utp->number, phex_nz (utp->addr, sizeof (utp->addr)), |
| utp->hit_count, |
| phex_nz (utp->traceframe_usage, |
| sizeof (utp->traceframe_usage))); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_tdesc. */ |
| |
| static void |
| tfile_write_tdesc (struct trace_file_writer *self) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| std::optional<std::string> tdesc |
| = target_fetch_description_xml (current_inferior ()->top_target ()); |
| |
| if (!tdesc) |
| return; |
| |
| const char *ptr = tdesc->c_str (); |
| |
| /* Write tdesc line by line, prefixing each line with "tdesc ". */ |
| while (ptr != NULL) |
| { |
| const char *next = strchr (ptr, '\n'); |
| if (next != NULL) |
| { |
| fprintf (writer->fp, "tdesc %.*s\n", (int) (next - ptr), ptr); |
| /* Skip the \n. */ |
| next++; |
| } |
| else if (*ptr != '\0') |
| { |
| /* Last line, doesn't have a newline. */ |
| fprintf (writer->fp, "tdesc %s\n", ptr); |
| } |
| ptr = next; |
| } |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_definition_end. */ |
| |
| static void |
| tfile_write_definition_end (struct trace_file_writer *self) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| fprintf (writer->fp, "\n"); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| write_raw_data. */ |
| |
| static void |
| tfile_write_raw_data (struct trace_file_writer *self, gdb_byte *buf, |
| LONGEST len) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| |
| if (fwrite (buf, len, 1, writer->fp) < 1) |
| perror_with_name (writer->pathname); |
| } |
| |
| /* This is the implementation of trace_file_write_ops method |
| end. */ |
| |
| static void |
| tfile_end (struct trace_file_writer *self) |
| { |
| struct tfile_trace_file_writer *writer |
| = (struct tfile_trace_file_writer *) self; |
| uint32_t gotten = 0; |
| |
| /* Mark the end of trace data. */ |
| if (fwrite (&gotten, 4, 1, writer->fp) < 1) |
| perror_with_name (writer->pathname); |
| } |
| |
| /* Operations to write trace buffers into TFILE format. */ |
| |
| static const struct trace_file_write_ops tfile_write_ops = |
| { |
| tfile_dtor, |
| tfile_target_save, |
| tfile_start, |
| tfile_write_header, |
| tfile_write_regblock_type, |
| tfile_write_status, |
| tfile_write_uploaded_tsv, |
| tfile_write_uploaded_tp, |
| tfile_write_tdesc, |
| tfile_write_definition_end, |
| tfile_write_raw_data, |
| NULL, |
| tfile_end, |
| }; |
| |
| /* Return a trace writer for TFILE format. */ |
| |
| struct trace_file_writer * |
| tfile_trace_file_writer_new (void) |
| { |
| struct tfile_trace_file_writer *writer |
| = XNEW (struct tfile_trace_file_writer); |
| |
| writer->base.ops = &tfile_write_ops; |
| writer->fp = NULL; |
| writer->pathname = NULL; |
| |
| return (struct trace_file_writer *) writer; |
| } |
| |
| /* target tfile command */ |
| |
| static tfile_target tfile_ops; |
| |
| #define TRACE_HEADER_SIZE 8 |
| |
| #define TFILE_PID (1) |
| |
| static gdb::unique_xmalloc_ptr<char> trace_filename; |
| static int trace_fd = -1; |
| static off_t trace_frames_offset; |
| static off_t cur_offset; |
| static int cur_data_size; |
| int trace_regblock_size; |
| static std::string trace_tdesc; |
| |
| static void tfile_append_tdesc_line (const char *line); |
| static void tfile_interp_line (const char *line, |
| struct uploaded_tp **utpp, |
| struct uploaded_tsv **utsvp); |
| |
| /* Read SIZE bytes into READBUF from the trace frame, starting at |
| TRACE_FD's current position. Note that this call `read' |
| underneath, hence it advances the file's seek position. Throws an |
| error if the `read' syscall fails, or less than SIZE bytes are |
| read. */ |
| |
| static void |
| tfile_read (gdb_byte *readbuf, int size) |
| { |
| int gotten; |
| |
| gotten = read (trace_fd, readbuf, size); |
| if (gotten < 0) |
| perror_with_name (trace_filename.get ()); |
| else if (gotten < size) |
| error (_("Premature end of file while reading trace file")); |
| } |
| |
| /* Open the tfile target. */ |
| |
| static void |
| tfile_target_open (const char *arg, int from_tty) |
| { |
| int flags; |
| int scratch_chan; |
| char header[TRACE_HEADER_SIZE]; |
| char linebuf[1000]; /* Should be max remote packet size or so. */ |
| gdb_byte byte; |
| int bytes, i; |
| struct trace_status *ts; |
| struct uploaded_tp *uploaded_tps = NULL; |
| struct uploaded_tsv *uploaded_tsvs = NULL; |
| |
| target_preopen (from_tty); |
| if (!arg) |
| error (_("No trace file specified.")); |
| |
| gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg)); |
| if (!IS_ABSOLUTE_PATH (filename.get ())) |
| filename = make_unique_xstrdup (gdb_abspath (filename).c_str ()); |
| |
| flags = O_BINARY | O_LARGEFILE; |
| flags |= O_RDONLY; |
| scratch_chan = gdb_open_cloexec (filename.get (), flags, 0).release (); |
| if (scratch_chan < 0) |
| perror_with_name (filename.get ()); |
| |
| /* Looks semi-reasonable. Toss the old trace file and work on the new. */ |
| |
| current_inferior ()->unpush_target (&tfile_ops); |
| |
| trace_filename = std::move (filename); |
| trace_fd = scratch_chan; |
| |
| /* Make sure this is clear. */ |
| trace_tdesc.clear (); |
| |
| bytes = 0; |
| /* Read the file header and test for validity. */ |
| tfile_read ((gdb_byte *) &header, TRACE_HEADER_SIZE); |
| |
| bytes += TRACE_HEADER_SIZE; |
| if (!(header[0] == 0x7f |
| && (startswith (header + 1, "TRACE0\n")))) |
| error (_("File is not a valid trace file.")); |
| |
| current_inferior ()->push_target (&tfile_ops); |
| |
| trace_regblock_size = 0; |
| ts = current_trace_status (); |
| /* We know we're working with a file. Record its name. */ |
| ts->filename = trace_filename.get (); |
| /* Set defaults in case there is no status line. */ |
| ts->running_known = 0; |
| ts->stop_reason = trace_stop_reason_unknown; |
| ts->traceframe_count = -1; |
| ts->buffer_free = 0; |
| ts->disconnected_tracing = 0; |
| ts->circular_buffer = 0; |
| |
| try |
| { |
| /* Read through a section of newline-terminated lines that |
| define things like tracepoints. */ |
| i = 0; |
| while (1) |
| { |
| tfile_read (&byte, 1); |
| |
| ++bytes; |
| if (byte == '\n') |
| { |
| /* Empty line marks end of the definition section. */ |
| if (i == 0) |
| break; |
| linebuf[i] = '\0'; |
| i = 0; |
| tfile_interp_line (linebuf, &uploaded_tps, &uploaded_tsvs); |
| } |
| else |
| linebuf[i++] = byte; |
| if (i >= 1000) |
| error (_("Excessively long lines in trace file")); |
| } |
| |
| /* By now, tdesc lines have been read from tfile - let's parse them. */ |
| target_find_description (); |
| |
| /* Record the starting offset of the binary trace data. */ |
| trace_frames_offset = bytes; |
| |
| /* If we don't have a blocksize, we can't interpret the |
| traceframes. */ |
| if (trace_regblock_size == 0) |
| error (_("No register block size recorded in trace file")); |
| } |
| catch (const gdb_exception &ex) |
| { |
| /* Remove the partially set up target. */ |
| current_inferior ()->unpush_target (&tfile_ops); |
| throw; |
| } |
| |
| inferior_appeared (current_inferior (), TFILE_PID); |
| |
| thread_info *thr = add_thread_silent (&tfile_ops, ptid_t (TFILE_PID)); |
| switch_to_thread (thr); |
| |
| if (ts->traceframe_count <= 0) |
| warning (_("No traceframes present in this file.")); |
| |
| /* Add the file's tracepoints and variables into the current mix. */ |
| |
| /* Get trace state variables first, they may be checked when parsing |
| uploaded commands. */ |
| merge_uploaded_trace_state_variables (&uploaded_tsvs); |
| |
| merge_uploaded_tracepoints (&uploaded_tps); |
| |
| post_create_inferior (from_tty); |
| } |
| |
| /* Interpret the given line from the definitions part of the trace |
| file. */ |
| |
| static void |
| tfile_interp_line (const char *line, struct uploaded_tp **utpp, |
| struct uploaded_tsv **utsvp) |
| { |
| const char *p = line; |
| |
| if (startswith (p, "R ")) |
| { |
| p += strlen ("R "); |
| trace_regblock_size = strtol (p, nullptr, 16); |
| } |
| else if (startswith (p, "status ")) |
| { |
| p += strlen ("status "); |
| parse_trace_status (p, current_trace_status ()); |
| } |
| else if (startswith (p, "tp ")) |
| { |
| p += strlen ("tp "); |
| parse_tracepoint_definition (p, utpp); |
| } |
| else if (startswith (p, "tsv ")) |
| { |
| p += strlen ("tsv "); |
| parse_tsv_definition (p, utsvp); |
| } |
| else if (startswith (p, "tdesc ")) |
| { |
| p += strlen ("tdesc "); |
| tfile_append_tdesc_line (p); |
| } |
| else |
| warning (_("Ignoring trace file definition \"%s\""), line); |
| } |
| |
| /* Close the trace file and generally clean up. */ |
| |
| void |
| tfile_target::close () |
| { |
| gdb_assert (trace_fd != -1); |
| |
| switch_to_no_thread (); /* Avoid confusion from thread stuff. */ |
| exit_inferior (current_inferior ()); |
| |
| ::close (trace_fd); |
| trace_fd = -1; |
| trace_filename.reset (); |
| trace_tdesc.clear (); |
| |
| trace_reset_local_state (); |
| } |
| |
| void |
| tfile_target::files_info () |
| { |
| gdb_printf ("\t`%s'\n", trace_filename.get ()); |
| } |
| |
| void |
| tfile_target::get_tracepoint_status (tracepoint *tp, struct uploaded_tp *utp) |
| { |
| /* Other bits of trace status were collected as part of opening the |
| trace files, so nothing to do here. */ |
| } |
| |
| /* Given the position of a traceframe in the file, figure out what |
| address the frame was collected at. This would normally be the |
| value of a collected PC register, but if not available, we |
| improvise. */ |
| |
| static CORE_ADDR |
| tfile_get_traceframe_address (off_t tframe_offset) |
| { |
| CORE_ADDR addr = 0; |
| short tpnum; |
| struct tracepoint *tp; |
| off_t saved_offset = cur_offset; |
| |
| /* FIXME dig pc out of collected registers. */ |
| |
| /* Fall back to using tracepoint address. */ |
| lseek (trace_fd, tframe_offset, SEEK_SET); |
| tfile_read ((gdb_byte *) &tpnum, 2); |
| tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| |
| tp = get_tracepoint_by_number_on_target (tpnum); |
| /* FIXME this is a poor heuristic if multiple locations. */ |
| if (tp != nullptr && tp->has_locations ()) |
| addr = tp->first_loc ().address; |
| |
| /* Restore our seek position. */ |
| cur_offset = saved_offset; |
| lseek (trace_fd, cur_offset, SEEK_SET); |
| return addr; |
| } |
| |
| /* Given a type of search and some parameters, scan the collection of |
| traceframes in the file looking for a match. When found, return |
| both the traceframe and tracepoint number, otherwise -1 for |
| each. */ |
| |
| int |
| tfile_target::trace_find (enum trace_find_type type, int num, |
| CORE_ADDR addr1, CORE_ADDR addr2, int *tpp) |
| { |
| short tpnum; |
| int tfnum = 0, found = 0; |
| unsigned int data_size; |
| struct tracepoint *tp; |
| off_t offset, tframe_offset; |
| CORE_ADDR tfaddr; |
| |
| if (num == -1) |
| { |
| if (tpp) |
| *tpp = -1; |
| return -1; |
| } |
| |
| lseek (trace_fd, trace_frames_offset, SEEK_SET); |
| offset = trace_frames_offset; |
| while (1) |
| { |
| tframe_offset = offset; |
| tfile_read ((gdb_byte *) &tpnum, 2); |
| tpnum = (short) extract_signed_integer ((gdb_byte *) &tpnum, 2, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| offset += 2; |
| if (tpnum == 0) |
| break; |
| tfile_read ((gdb_byte *) &data_size, 4); |
| data_size = (unsigned int) extract_unsigned_integer |
| ((gdb_byte *) &data_size, 4, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| offset += 4; |
| |
| if (type == tfind_number) |
| { |
| /* Looking for a specific trace frame. */ |
| if (tfnum == num) |
| found = 1; |
| } |
| else |
| { |
| /* Start from the _next_ trace frame. */ |
| if (tfnum > get_traceframe_number ()) |
| { |
| switch (type) |
| { |
| case tfind_pc: |
| tfaddr = tfile_get_traceframe_address (tframe_offset); |
| if (tfaddr == addr1) |
| found = 1; |
| break; |
| case tfind_tp: |
| tp = get_tracepoint (num); |
| if (tp && tpnum == tp->number_on_target) |
| found = 1; |
| break; |
| case tfind_range: |
| tfaddr = tfile_get_traceframe_address (tframe_offset); |
| if (addr1 <= tfaddr && tfaddr <= addr2) |
| found = 1; |
| break; |
| case tfind_outside: |
| tfaddr = tfile_get_traceframe_address (tframe_offset); |
| if (!(addr1 <= tfaddr && tfaddr <= addr2)) |
| found = 1; |
| break; |
| default: |
| internal_error (_("unknown tfind type")); |
| } |
| } |
| } |
| |
| if (found) |
| { |
| if (tpp) |
| *tpp = tpnum; |
| cur_offset = offset; |
| cur_data_size = data_size; |
| |
| return tfnum; |
| } |
| /* Skip past the traceframe's data. */ |
| lseek (trace_fd, data_size, SEEK_CUR); |
| offset += data_size; |
| /* Update our own count of traceframes. */ |
| ++tfnum; |
| } |
| /* Did not find what we were looking for. */ |
| if (tpp) |
| *tpp = -1; |
| return -1; |
| } |
| |
| /* Walk over all traceframe block starting at POS offset from |
| CUR_OFFSET, and call CALLBACK for each block found. If CALLBACK |
| returns true, this returns the position in the traceframe where the |
| block is found, relative to the start of the traceframe |
| (cur_offset). Returns -1 if no callback call returned true, |
| indicating that all blocks have been walked. */ |
| |
| static int |
| traceframe_walk_blocks (gdb::function_view<bool (char)> callback, int pos) |
| { |
| /* Iterate through a traceframe's blocks, looking for a block of the |
| requested type. */ |
| |
| lseek (trace_fd, cur_offset + pos, SEEK_SET); |
| while (pos < cur_data_size) |
| { |
| unsigned short mlen; |
| char block_type; |
| |
| tfile_read ((gdb_byte *) &block_type, 1); |
| |
| ++pos; |
| |
| if (callback (block_type)) |
| return pos; |
| |
| switch (block_type) |
| { |
| case 'R': |
| lseek (trace_fd, cur_offset + pos + trace_regblock_size, SEEK_SET); |
| pos += trace_regblock_size; |
| break; |
| case 'M': |
| lseek (trace_fd, cur_offset + pos + 8, SEEK_SET); |
| tfile_read ((gdb_byte *) &mlen, 2); |
| mlen = (unsigned short) |
| extract_unsigned_integer ((gdb_byte *) &mlen, 2, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| lseek (trace_fd, mlen, SEEK_CUR); |
| pos += (8 + 2 + mlen); |
| break; |
| case 'V': |
| lseek (trace_fd, cur_offset + pos + 4 + 8, SEEK_SET); |
| pos += (4 + 8); |
| break; |
| default: |
| error (_("Unknown block type '%c' (0x%x) in trace frame"), |
| block_type, block_type); |
| break; |
| } |
| } |
| |
| return -1; |
| } |
| |
| /* Convenience wrapper around traceframe_walk_blocks. Looks for the |
| position offset of a block of type TYPE_WANTED in the current trace |
| frame, starting at POS. Returns -1 if no such block was found. */ |
| |
| static int |
| traceframe_find_block_type (char type_wanted, int pos) |
| { |
| return traceframe_walk_blocks ([&] (char blocktype) |
| { |
| return blocktype == type_wanted; |
| }, pos); |
| } |
| |
| /* Look for a block of saved registers in the traceframe, and get the |
| requested register from it. */ |
| |
| void |
| tfile_target::fetch_registers (struct regcache *regcache, int regno) |
| { |
| struct gdbarch *gdbarch = regcache->arch (); |
| int offset, regn, regsize, dummy; |
| |
| /* An uninitialized reg size says we're not going to be |
| successful at getting register blocks. */ |
| if (!trace_regblock_size) |
| return; |
| |
| if (traceframe_find_block_type ('R', 0) >= 0) |
| { |
| gdb_byte *regs = (gdb_byte *) alloca (trace_regblock_size); |
| |
| tfile_read (regs, trace_regblock_size); |
| |
| for (regn = 0; regn < gdbarch_num_regs (gdbarch); regn++) |
| { |
| if (!remote_register_number_and_offset (regcache->arch (), |
| regn, &dummy, &offset)) |
| continue; |
| |
| regsize = register_size (gdbarch, regn); |
| /* Make sure we stay within block bounds. */ |
| if (offset + regsize > trace_regblock_size) |
| break; |
| if (regcache->get_register_status (regn) == REG_UNKNOWN) |
| { |
| if (regno == regn) |
| { |
| regcache->raw_supply (regno, regs + offset); |
| break; |
| } |
| else if (regno == -1) |
| { |
| regcache->raw_supply (regn, regs + offset); |
| } |
| } |
| } |
| } |
| else |
| tracefile_fetch_registers (regcache, regno); |
| } |
| |
| static enum target_xfer_status |
| tfile_xfer_partial_features (const char *annex, |
| gdb_byte *readbuf, const gdb_byte *writebuf, |
| ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) |
| { |
| if (strcmp (annex, "target.xml")) |
| return TARGET_XFER_E_IO; |
| |
| if (readbuf == NULL) |
| error (_("tfile_xfer_partial: tdesc is read-only")); |
| |
| if (trace_tdesc.empty ()) |
| return TARGET_XFER_E_IO; |
| |
| if (offset >= trace_tdesc.length ()) |
| return TARGET_XFER_EOF; |
| |
| if (len > trace_tdesc.length () - offset) |
| len = trace_tdesc.length () - offset; |
| |
| memcpy (readbuf, trace_tdesc.c_str () + offset, len); |
| *xfered_len = len; |
| |
| return TARGET_XFER_OK; |
| } |
| |
| enum target_xfer_status |
| tfile_target::xfer_partial (enum target_object object, |
| const char *annex, gdb_byte *readbuf, |
| const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
| ULONGEST *xfered_len) |
| { |
| /* We're only doing regular memory and tdesc for now. */ |
| if (object == TARGET_OBJECT_AVAILABLE_FEATURES) |
| return tfile_xfer_partial_features (annex, readbuf, writebuf, |
| offset, len, xfered_len); |
| if (object != TARGET_OBJECT_MEMORY) |
| return TARGET_XFER_E_IO; |
| |
| if (readbuf == NULL) |
| error (_("tfile_xfer_partial: trace file is read-only")); |
| |
| if (get_traceframe_number () != -1) |
| { |
| int pos = 0; |
| enum target_xfer_status res; |
| /* Records the lowest available address of all blocks that |
| intersects the requested range. */ |
| ULONGEST low_addr_available = 0; |
| |
| /* Iterate through the traceframe's blocks, looking for |
| memory. */ |
| while ((pos = traceframe_find_block_type ('M', pos)) >= 0) |
| { |
| ULONGEST maddr, amt; |
| unsigned short mlen; |
| bfd_endian byte_order |
| = gdbarch_byte_order (current_inferior ()->arch ()); |
| |
| tfile_read ((gdb_byte *) &maddr, 8); |
| maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, |
| byte_order); |
| tfile_read ((gdb_byte *) &mlen, 2); |
| mlen = (unsigned short) |
| extract_unsigned_integer ((gdb_byte *) &mlen, 2, byte_order); |
| |
| /* If the block includes the first part of the desired |
| range, return as much it has; GDB will re-request the |
| remainder, which might be in a different block of this |
| trace frame. */ |
| if (maddr <= offset && offset < (maddr + mlen)) |
| { |
| amt = (maddr + mlen) - offset; |
| if (amt > len) |
| amt = len; |
| |
| if (maddr != offset) |
| lseek (trace_fd, offset - maddr, SEEK_CUR); |
| tfile_read (readbuf, amt); |
| *xfered_len = amt; |
| return TARGET_XFER_OK; |
| } |
| |
| if (offset < maddr && maddr < (offset + len)) |
| if (low_addr_available == 0 || low_addr_available > maddr) |
| low_addr_available = maddr; |
| |
| /* Skip over this block. */ |
| pos += (8 + 2 + mlen); |
| } |
| |
| /* Requested memory is unavailable in the context of traceframes, |
| and this address falls within a read-only section, fallback |
| to reading from executable, up to LOW_ADDR_AVAILABLE. */ |
| if (offset < low_addr_available) |
| len = std::min (len, low_addr_available - offset); |
| res = exec_read_partial_read_only (readbuf, offset, len, xfered_len); |
| |
| if (res == TARGET_XFER_OK) |
| return TARGET_XFER_OK; |
| else |
| { |
| /* No use trying further, we know some memory starting |
| at MEMADDR isn't available. */ |
| *xfered_len = len; |
| return TARGET_XFER_UNAVAILABLE; |
| } |
| } |
| else |
| { |
| /* Fallback to reading from read-only sections. */ |
| return section_table_read_available_memory (readbuf, offset, len, |
| xfered_len); |
| } |
| } |
| |
| /* Iterate through the blocks of a trace frame, looking for a 'V' |
| block with a matching tsv number. */ |
| |
| bool |
| tfile_target::get_trace_state_variable_value (int tsvnum, LONGEST *val) |
| { |
| int pos; |
| bool found = false; |
| |
| /* Iterate over blocks in current frame and find the last 'V' |
| block in which tsv number is TSVNUM. In one trace frame, there |
| may be multiple 'V' blocks created for a given trace variable, |
| and the last matched 'V' block contains the updated value. */ |
| pos = 0; |
| while ((pos = traceframe_find_block_type ('V', pos)) >= 0) |
| { |
| int vnum; |
| |
| tfile_read ((gdb_byte *) &vnum, 4); |
| vnum = (int) extract_signed_integer ((gdb_byte *) &vnum, 4, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| if (tsvnum == vnum) |
| { |
| tfile_read ((gdb_byte *) val, 8); |
| *val = extract_signed_integer ((gdb_byte *) val, 8, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| found = true; |
| } |
| pos += (4 + 8); |
| } |
| |
| return found; |
| } |
| |
| /* Callback for traceframe_walk_blocks. Builds a traceframe_info |
| object for the tfile target's current traceframe. */ |
| |
| static bool |
| build_traceframe_info (char blocktype, struct traceframe_info *info) |
| { |
| switch (blocktype) |
| { |
| case 'M': |
| { |
| ULONGEST maddr; |
| unsigned short mlen; |
| |
| tfile_read ((gdb_byte *) &maddr, 8); |
| maddr = extract_unsigned_integer ((gdb_byte *) &maddr, 8, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| tfile_read ((gdb_byte *) &mlen, 2); |
| mlen = (unsigned short) |
| extract_unsigned_integer ((gdb_byte *) &mlen, |
| 2, |
| gdbarch_byte_order |
| (current_inferior ()->arch ())); |
| |
| info->memory.emplace_back (maddr, mlen); |
| break; |
| } |
| case 'V': |
| { |
| int vnum; |
| |
| tfile_read ((gdb_byte *) &vnum, 4); |
| info->tvars.push_back (vnum); |
| } |
| case 'R': |
| case 'S': |
| { |
| break; |
| } |
| default: |
| warning (_("Unhandled trace block type (%d) '%c ' " |
| "while building trace frame info."), |
| blocktype, blocktype); |
| break; |
| } |
| |
| return false; |
| } |
| |
| traceframe_info_up |
| tfile_target::traceframe_info () |
| { |
| traceframe_info_up info (new struct traceframe_info); |
| |
| traceframe_walk_blocks ([&] (char blocktype) |
| { |
| return build_traceframe_info (blocktype, info.get ()); |
| }, 0); |
| |
| return info; |
| } |
| |
| /* Handles tdesc lines from tfile by appending the payload to |
| a global trace_tdesc variable. */ |
| |
| static void |
| tfile_append_tdesc_line (const char *line) |
| { |
| trace_tdesc += line; |
| trace_tdesc += "\n"; |
| } |
| |
| void _initialize_tracefile_tfile (); |
| void |
| _initialize_tracefile_tfile () |
| { |
| add_target (tfile_target_info, tfile_target_open, filename_completer); |
| } |