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c906108c | 1 | /* Core dump and executable file functions below target vector, for GDB. |
4646aa9d | 2 | |
213516ef | 3 | Copyright (C) 1986-2023 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | #include "defs.h" | |
d55e5aa6 | 21 | #include "arch-utils.h" |
4de283e4 TT |
22 | #include <signal.h> |
23 | #include <fcntl.h> | |
ef0f16cc | 24 | #include "frame.h" |
d55e5aa6 TT |
25 | #include "inferior.h" |
26 | #include "infrun.h" | |
4de283e4 TT |
27 | #include "symtab.h" |
28 | #include "command.h" | |
29 | #include "bfd.h" | |
30 | #include "target.h" | |
d55e5aa6 | 31 | #include "process-stratum-target.h" |
4de283e4 TT |
32 | #include "gdbcore.h" |
33 | #include "gdbthread.h" | |
4e052eda | 34 | #include "regcache.h" |
0e24ac5d | 35 | #include "regset.h" |
d55e5aa6 | 36 | #include "symfile.h" |
4de283e4 | 37 | #include "exec.h" |
e0eac551 | 38 | #include "readline/tilde.h" |
4de283e4 | 39 | #include "solib.h" |
db082f59 | 40 | #include "solist.h" |
4de283e4 TT |
41 | #include "filenames.h" |
42 | #include "progspace.h" | |
43 | #include "objfiles.h" | |
44 | #include "gdb_bfd.h" | |
45 | #include "completer.h" | |
268a13a5 | 46 | #include "gdbsupport/filestuff.h" |
aa2d5a42 | 47 | #include "build-id.h" |
ff8577f6 | 48 | #include "gdbsupport/pathstuff.h" |
b91f93a0 | 49 | #include "gdbsupport/scoped_fd.h" |
c689d1fe | 50 | #include "gdbsupport/x86-xstate.h" |
b91f93a0 | 51 | #include "debuginfod-support.h" |
db082f59 | 52 | #include <unordered_map> |
973695d6 | 53 | #include <unordered_set> |
09c2f5d4 | 54 | #include "gdbcmd.h" |
95ce627a | 55 | #include "xml-tdesc.h" |
68cffbbd | 56 | #include "memtag.h" |
8e860359 | 57 | |
ee28ca0f AC |
58 | #ifndef O_LARGEFILE |
59 | #define O_LARGEFILE 0 | |
60 | #endif | |
61 | ||
f6ac5f3d PA |
62 | /* The core file target. */ |
63 | ||
d9f719f1 PA |
64 | static const target_info core_target_info = { |
65 | "core", | |
66 | N_("Local core dump file"), | |
590042fc PW |
67 | N_("Use a core file as a target.\n\ |
68 | Specify the filename of the core file.") | |
d9f719f1 PA |
69 | }; |
70 | ||
3b3dac9b | 71 | class core_target final : public process_stratum_target |
f6ac5f3d PA |
72 | { |
73 | public: | |
15244507 | 74 | core_target (); |
f6ac5f3d | 75 | |
d9f719f1 PA |
76 | const target_info &info () const override |
77 | { return core_target_info; } | |
f6ac5f3d | 78 | |
f6ac5f3d PA |
79 | void close () override; |
80 | void detach (inferior *, int) override; | |
81 | void fetch_registers (struct regcache *, int) override; | |
82 | ||
83 | enum target_xfer_status xfer_partial (enum target_object object, | |
84 | const char *annex, | |
85 | gdb_byte *readbuf, | |
86 | const gdb_byte *writebuf, | |
87 | ULONGEST offset, ULONGEST len, | |
88 | ULONGEST *xfered_len) override; | |
89 | void files_info () override; | |
90 | ||
57810aa7 | 91 | bool thread_alive (ptid_t ptid) override; |
f6ac5f3d PA |
92 | const struct target_desc *read_description () override; |
93 | ||
a068643d | 94 | std::string pid_to_str (ptid_t) override; |
f6ac5f3d PA |
95 | |
96 | const char *thread_name (struct thread_info *) override; | |
97 | ||
2735d421 | 98 | bool has_all_memory () override { return true; } |
57810aa7 PA |
99 | bool has_memory () override; |
100 | bool has_stack () override; | |
101 | bool has_registers () override; | |
5018ce90 | 102 | bool has_execution (inferior *inf) override { return false; } |
f3d11a9a | 103 | |
f6ac5f3d | 104 | bool info_proc (const char *, enum info_proc_what) override; |
f6ac5f3d | 105 | |
68cffbbd LM |
106 | bool supports_memory_tagging () override; |
107 | ||
108 | /* Core file implementation of fetch_memtags. Fetch the memory tags from | |
109 | core file notes. */ | |
110 | bool fetch_memtags (CORE_ADDR address, size_t len, | |
111 | gdb::byte_vector &tags, int type) override; | |
112 | ||
c689d1fe JB |
113 | x86_xsave_layout fetch_x86_xsave_layout () override; |
114 | ||
15244507 PA |
115 | /* A few helpers. */ |
116 | ||
117 | /* Getter, see variable definition. */ | |
118 | struct gdbarch *core_gdbarch () | |
119 | { | |
120 | return m_core_gdbarch; | |
121 | } | |
122 | ||
123 | /* See definition. */ | |
124 | void get_core_register_section (struct regcache *regcache, | |
125 | const struct regset *regset, | |
126 | const char *name, | |
dbd534fe | 127 | int section_min_size, |
15244507 PA |
128 | const char *human_name, |
129 | bool required); | |
130 | ||
09c2f5d4 KB |
131 | /* See definition. */ |
132 | void info_proc_mappings (struct gdbarch *gdbarch); | |
133 | ||
15244507 PA |
134 | private: /* per-core data */ |
135 | ||
5d067f3d PA |
136 | /* Get rid of the core inferior. */ |
137 | void clear_core (); | |
138 | ||
15244507 PA |
139 | /* The core's section table. Note that these target sections are |
140 | *not* mapped in the current address spaces' set of target | |
141 | sections --- those should come only from pure executable or | |
142 | shared library bfds. The core bfd sections are an implementation | |
143 | detail of the core target, just like ptrace is for unix child | |
144 | targets. */ | |
25b5a04e | 145 | std::vector<target_section> m_core_section_table; |
15244507 | 146 | |
db082f59 KB |
147 | /* File-backed address space mappings: some core files include |
148 | information about memory mapped files. */ | |
25b5a04e | 149 | std::vector<target_section> m_core_file_mappings; |
db082f59 | 150 | |
973695d6 KB |
151 | /* Unavailable mappings. These correspond to pathnames which either |
152 | weren't found or could not be opened. Knowing these addresses can | |
153 | still be useful. */ | |
154 | std::vector<mem_range> m_core_unavailable_mappings; | |
155 | ||
db082f59 KB |
156 | /* Build m_core_file_mappings. Called from the constructor. */ |
157 | void build_file_mappings (); | |
158 | ||
973695d6 KB |
159 | /* Helper method for xfer_partial. */ |
160 | enum target_xfer_status xfer_memory_via_mappings (gdb_byte *readbuf, | |
161 | const gdb_byte *writebuf, | |
162 | ULONGEST offset, | |
163 | ULONGEST len, | |
164 | ULONGEST *xfered_len); | |
165 | ||
15244507 PA |
166 | /* FIXME: kettenis/20031023: Eventually this field should |
167 | disappear. */ | |
168 | struct gdbarch *m_core_gdbarch = NULL; | |
169 | }; | |
c906108c | 170 | |
15244507 PA |
171 | core_target::core_target () |
172 | { | |
134df964 LM |
173 | /* Find a first arch based on the BFD. We need the initial gdbarch so |
174 | we can setup the hooks to find a target description. */ | |
15244507 | 175 | m_core_gdbarch = gdbarch_from_bfd (core_bfd); |
2acceee2 | 176 | |
134df964 LM |
177 | /* If the arch is able to read a target description from the core, it |
178 | could yield a more specific gdbarch. */ | |
179 | const struct target_desc *tdesc = read_description (); | |
180 | ||
181 | if (tdesc != nullptr) | |
182 | { | |
183 | struct gdbarch_info info; | |
134df964 LM |
184 | info.abfd = core_bfd; |
185 | info.target_desc = tdesc; | |
186 | m_core_gdbarch = gdbarch_find_by_info (info); | |
187 | } | |
188 | ||
6ba0a321 CB |
189 | if (!m_core_gdbarch |
190 | || !gdbarch_iterate_over_regset_sections_p (m_core_gdbarch)) | |
191 | error (_("\"%s\": Core file format not supported"), | |
192 | bfd_get_filename (core_bfd)); | |
2acceee2 | 193 | |
15244507 | 194 | /* Find the data section */ |
2d128614 | 195 | m_core_section_table = build_section_table (core_bfd); |
db082f59 KB |
196 | |
197 | build_file_mappings (); | |
15244507 | 198 | } |
0e24ac5d | 199 | |
25b5a04e | 200 | /* Construct the table for file-backed mappings if they exist. |
db082f59 KB |
201 | |
202 | For each unique path in the note, we'll open a BFD with a bfd | |
203 | target of "binary". This is an unstructured bfd target upon which | |
204 | we'll impose a structure from the mappings in the architecture-specific | |
205 | mappings note. A BFD section is allocated and initialized for each | |
206 | file-backed mapping. | |
207 | ||
208 | We take care to not share already open bfds with other parts of | |
209 | GDB; in particular, we don't want to add new sections to existing | |
210 | BFDs. We do, however, ensure that the BFDs that we allocate here | |
211 | will go away (be deallocated) when the core target is detached. */ | |
212 | ||
213 | void | |
214 | core_target::build_file_mappings () | |
215 | { | |
216 | std::unordered_map<std::string, struct bfd *> bfd_map; | |
973695d6 | 217 | std::unordered_set<std::string> unavailable_paths; |
db082f59 KB |
218 | |
219 | /* See linux_read_core_file_mappings() in linux-tdep.c for an example | |
220 | read_core_file_mappings method. */ | |
221 | gdbarch_read_core_file_mappings (m_core_gdbarch, core_bfd, | |
222 | ||
223 | /* After determining the number of mappings, read_core_file_mappings | |
bb2a6777 TT |
224 | will invoke this lambda. */ |
225 | [&] (ULONGEST) | |
db082f59 | 226 | { |
db082f59 KB |
227 | }, |
228 | ||
229 | /* read_core_file_mappings will invoke this lambda for each mapping | |
230 | that it finds. */ | |
231 | [&] (int num, ULONGEST start, ULONGEST end, ULONGEST file_ofs, | |
aa95b2d4 | 232 | const char *filename, const bfd_build_id *build_id) |
db082f59 KB |
233 | { |
234 | /* Architecture-specific read_core_mapping methods are expected to | |
235 | weed out non-file-backed mappings. */ | |
236 | gdb_assert (filename != nullptr); | |
237 | ||
ea70f941 LS |
238 | if (unavailable_paths.find (filename) != unavailable_paths.end ()) |
239 | { | |
240 | /* We have already seen some mapping for FILENAME but failed to | |
241 | find/open the file. There is no point in trying the same | |
242 | thing again so just record that the range [start, end) is | |
243 | unavailable. */ | |
244 | m_core_unavailable_mappings.emplace_back (start, end - start); | |
245 | return; | |
246 | } | |
247 | ||
db082f59 KB |
248 | struct bfd *bfd = bfd_map[filename]; |
249 | if (bfd == nullptr) | |
250 | { | |
251 | /* Use exec_file_find() to do sysroot expansion. It'll | |
252 | also strip the potential sysroot "target:" prefix. If | |
253 | there is no sysroot, an equivalent (possibly more | |
254 | canonical) pathname will be provided. */ | |
255 | gdb::unique_xmalloc_ptr<char> expanded_fname | |
256 | = exec_file_find (filename, NULL); | |
b91f93a0 AM |
257 | |
258 | if (expanded_fname == nullptr && build_id != nullptr) | |
259 | debuginfod_exec_query (build_id->data, build_id->size, | |
260 | filename, &expanded_fname); | |
261 | ||
db082f59 KB |
262 | if (expanded_fname == nullptr) |
263 | { | |
973695d6 | 264 | m_core_unavailable_mappings.emplace_back (start, end - start); |
ea70f941 LS |
265 | unavailable_paths.insert (filename); |
266 | warning (_("Can't open file %s during file-backed mapping " | |
267 | "note processing"), | |
268 | filename); | |
db082f59 KB |
269 | return; |
270 | } | |
271 | ||
9b3a1001 | 272 | bfd = bfd_openr (expanded_fname.get (), "binary"); |
db082f59 KB |
273 | |
274 | if (bfd == nullptr || !bfd_check_format (bfd, bfd_object)) | |
275 | { | |
973695d6 | 276 | m_core_unavailable_mappings.emplace_back (start, end - start); |
ea70f941 LS |
277 | unavailable_paths.insert (filename); |
278 | warning (_("Can't open file %s which was expanded to %s " | |
279 | "during file-backed mapping note processing"), | |
280 | filename, expanded_fname.get ()); | |
0ad504dd | 281 | |
db082f59 KB |
282 | if (bfd != nullptr) |
283 | bfd_close (bfd); | |
284 | return; | |
285 | } | |
286 | /* Ensure that the bfd will be closed when core_bfd is closed. | |
287 | This can be checked before/after a core file detach via | |
288 | "maint info bfds". */ | |
289 | gdb_bfd_record_inclusion (core_bfd, bfd); | |
9b3a1001 | 290 | bfd_map[filename] = bfd; |
db082f59 KB |
291 | } |
292 | ||
293 | /* Make new BFD section. All sections have the same name, | |
294 | which is permitted by bfd_make_section_anyway(). */ | |
295 | asection *sec = bfd_make_section_anyway (bfd, "load"); | |
296 | if (sec == nullptr) | |
297 | error (_("Can't make section")); | |
298 | sec->filepos = file_ofs; | |
299 | bfd_set_section_flags (sec, SEC_READONLY | SEC_HAS_CONTENTS); | |
300 | bfd_set_section_size (sec, end - start); | |
301 | bfd_set_section_vma (sec, start); | |
302 | bfd_set_section_lma (sec, start); | |
303 | bfd_set_section_alignment (sec, 2); | |
304 | ||
305 | /* Set target_section fields. */ | |
6be2a9ab | 306 | m_core_file_mappings.emplace_back (start, end, sec); |
39f53acb AM |
307 | |
308 | /* If this is a bfd of a shared library, record its soname | |
309 | and build id. */ | |
310 | if (build_id != nullptr) | |
311 | { | |
312 | gdb::unique_xmalloc_ptr<char> soname | |
313 | = gdb_bfd_read_elf_soname (bfd->filename); | |
314 | if (soname != nullptr) | |
315 | set_cbfd_soname_build_id (current_program_space->cbfd, | |
316 | soname.get (), build_id); | |
317 | } | |
db082f59 | 318 | }); |
973695d6 KB |
319 | |
320 | normalize_mem_ranges (&m_core_unavailable_mappings); | |
15244507 | 321 | } |
0e24ac5d | 322 | |
7f9f62ba PA |
323 | /* An arbitrary identifier for the core inferior. */ |
324 | #define CORELOW_PID 1 | |
325 | ||
15244507 | 326 | void |
5d067f3d | 327 | core_target::clear_core () |
c906108c | 328 | { |
c906108c SS |
329 | if (core_bfd) |
330 | { | |
60db1b85 PA |
331 | switch_to_no_thread (); /* Avoid confusion from thread |
332 | stuff. */ | |
9324bfea | 333 | exit_inferior (current_inferior ()); |
c906108c | 334 | |
aff410f1 | 335 | /* Clear out solib state while the bfd is still open. See |
dda83cd7 | 336 | comments in clear_solib in solib.c. */ |
a77053c2 | 337 | clear_solib (); |
7a292a7a | 338 | |
06333fea | 339 | current_program_space->cbfd.reset (nullptr); |
c906108c | 340 | } |
5d067f3d PA |
341 | } |
342 | ||
343 | /* Close the core target. */ | |
344 | ||
345 | void | |
346 | core_target::close () | |
347 | { | |
348 | clear_core (); | |
c906108c | 349 | |
15244507 PA |
350 | /* Core targets are heap-allocated (see core_target_open), so here |
351 | we delete ourselves. */ | |
352 | delete this; | |
74b7792f AC |
353 | } |
354 | ||
aff410f1 MS |
355 | /* Look for sections whose names start with `.reg/' so that we can |
356 | extract the list of threads in a core file. */ | |
c906108c | 357 | |
22ed0412 AB |
358 | /* If ASECT is a section whose name begins with '.reg/' then extract the |
359 | lwpid after the '/' and create a new thread in INF. | |
360 | ||
361 | If REG_SECT is not nullptr, and the both ASECT and REG_SECT point at the | |
362 | same position in the parent bfd object then switch to the newly created | |
363 | thread, otherwise, the selected thread is left unchanged. */ | |
364 | ||
c906108c | 365 | static void |
22ed0412 | 366 | add_to_thread_list (asection *asect, asection *reg_sect, inferior *inf) |
c906108c | 367 | { |
fd361982 | 368 | if (!startswith (bfd_section_name (asect), ".reg/")) |
c906108c SS |
369 | return; |
370 | ||
22ed0412 AB |
371 | int lwpid = atoi (bfd_section_name (asect) + 5); |
372 | ptid_t ptid (inf->pid, lwpid); | |
60db1b85 | 373 | thread_info *thr = add_thread (inf->process_target (), ptid); |
c906108c | 374 | |
22ed0412 | 375 | /* Warning, Will Robinson, looking at BFD private data! */ |
c906108c SS |
376 | |
377 | if (reg_sect != NULL | |
aff410f1 | 378 | && asect->filepos == reg_sect->filepos) /* Did we find .reg? */ |
60db1b85 | 379 | switch_to_thread (thr); /* Yes, make it current. */ |
c906108c SS |
380 | } |
381 | ||
451953fa PA |
382 | /* Issue a message saying we have no core to debug, if FROM_TTY. */ |
383 | ||
384 | static void | |
385 | maybe_say_no_core_file_now (int from_tty) | |
386 | { | |
387 | if (from_tty) | |
6cb06a8c | 388 | gdb_printf (_("No core file now.\n")); |
451953fa PA |
389 | } |
390 | ||
30baf67b | 391 | /* Backward compatibility with old way of specifying core files. */ |
451953fa PA |
392 | |
393 | void | |
394 | core_file_command (const char *filename, int from_tty) | |
395 | { | |
396 | dont_repeat (); /* Either way, seems bogus. */ | |
397 | ||
398 | if (filename == NULL) | |
399 | { | |
400 | if (core_bfd != NULL) | |
401 | { | |
402 | target_detach (current_inferior (), from_tty); | |
403 | gdb_assert (core_bfd == NULL); | |
404 | } | |
405 | else | |
406 | maybe_say_no_core_file_now (from_tty); | |
407 | } | |
408 | else | |
409 | core_target_open (filename, from_tty); | |
410 | } | |
411 | ||
08796916 AB |
412 | /* A vmcore file is a core file created by the Linux kernel at the point of |
413 | a crash. Each thread in the core file represents a real CPU core, and | |
414 | the lwpid for each thread is the pid of the process that was running on | |
415 | that core at the moment of the crash. | |
416 | ||
417 | However, not every CPU core will have been running a process, some cores | |
418 | will be idle. For these idle cores the CPU writes an lwpid of 0. And | |
419 | of course, multiple cores might be idle, so there could be multiple | |
420 | threads with an lwpid of 0. | |
421 | ||
422 | The problem is GDB doesn't really like threads with an lwpid of 0; GDB | |
423 | presents such a thread as a process rather than a thread. And GDB | |
424 | certainly doesn't like multiple threads having the same lwpid, each time | |
425 | a new thread is seen with the same lwpid the earlier thread (with the | |
426 | same lwpid) will be deleted. | |
427 | ||
428 | This function addresses both of these problems by assigning a fake lwpid | |
429 | to any thread with an lwpid of 0. | |
430 | ||
431 | GDB finds the lwpid information by looking at the bfd section names | |
432 | which include the lwpid, e.g. .reg/NN where NN is the lwpid. This | |
433 | function looks though all the section names looking for sections named | |
434 | .reg/NN. If any sections are found where NN == 0, then we assign a new | |
435 | unique value of NN. Then, in a second pass, any sections ending /0 are | |
436 | assigned their new number. | |
437 | ||
438 | Remember, a core file may contain multiple register sections for | |
439 | different register sets, but the sets are always grouped by thread, so | |
440 | we can figure out which registers should be assigned the same new | |
441 | lwpid. For example, consider a core file containing: | |
442 | ||
443 | .reg/0, .reg2/0, .reg/0, .reg2/0 | |
444 | ||
445 | This represents two threads, each thread contains a .reg and .reg2 | |
446 | register set. The .reg represents the start of each thread. After | |
447 | renaming the sections will now look like this: | |
448 | ||
449 | .reg/1, .reg2/1, .reg/2, .reg2/2 | |
450 | ||
451 | After calling this function the rest of the core file handling code can | |
452 | treat this core file just like any other core file. */ | |
453 | ||
454 | static void | |
455 | rename_vmcore_idle_reg_sections (bfd *abfd, inferior *inf) | |
456 | { | |
457 | /* Map from the bfd section to its lwpid (the /NN number). */ | |
458 | std::vector<std::pair<asection *, int>> sections_and_lwpids; | |
459 | ||
460 | /* The set of all /NN numbers found. Needed so we can easily find unused | |
461 | numbers in the case that we need to rename some sections. */ | |
462 | std::unordered_set<int> all_lwpids; | |
463 | ||
464 | /* A count of how many sections called .reg/0 we have found. */ | |
465 | unsigned zero_lwpid_count = 0; | |
466 | ||
467 | /* Look for all the .reg sections. Record the section object and the | |
468 | lwpid which is extracted from the section name. Spot if any have an | |
469 | lwpid of zero. */ | |
470 | for (asection *sect : gdb_bfd_sections (core_bfd)) | |
471 | { | |
472 | if (startswith (bfd_section_name (sect), ".reg/")) | |
473 | { | |
474 | int lwpid = atoi (bfd_section_name (sect) + 5); | |
475 | sections_and_lwpids.emplace_back (sect, lwpid); | |
476 | all_lwpids.insert (lwpid); | |
477 | if (lwpid == 0) | |
478 | zero_lwpid_count++; | |
479 | } | |
480 | } | |
481 | ||
482 | /* If every ".reg/NN" section has a non-zero lwpid then we don't need to | |
483 | do any renaming. */ | |
484 | if (zero_lwpid_count == 0) | |
485 | return; | |
486 | ||
487 | /* Assign a new number to any .reg sections with an lwpid of 0. */ | |
488 | int new_lwpid = 1; | |
489 | for (auto §_and_lwpid : sections_and_lwpids) | |
490 | if (sect_and_lwpid.second == 0) | |
491 | { | |
492 | while (all_lwpids.find (new_lwpid) != all_lwpids.end ()) | |
493 | new_lwpid++; | |
494 | sect_and_lwpid.second = new_lwpid; | |
495 | new_lwpid++; | |
496 | } | |
497 | ||
498 | /* Now update the names of any sections with an lwpid of 0. This is | |
499 | more than just the .reg sections we originally found. */ | |
500 | std::string replacement_lwpid_str; | |
501 | auto iter = sections_and_lwpids.begin (); | |
502 | int replacement_lwpid = 0; | |
503 | for (asection *sect : gdb_bfd_sections (core_bfd)) | |
504 | { | |
505 | if (iter != sections_and_lwpids.end () && sect == iter->first) | |
506 | { | |
507 | gdb_assert (startswith (bfd_section_name (sect), ".reg/")); | |
508 | ||
509 | int lwpid = atoi (bfd_section_name (sect) + 5); | |
510 | if (lwpid == iter->second) | |
511 | { | |
512 | /* This section was not given a new number. */ | |
513 | gdb_assert (lwpid != 0); | |
514 | replacement_lwpid = 0; | |
515 | } | |
516 | else | |
517 | { | |
518 | replacement_lwpid = iter->second; | |
519 | ptid_t ptid (inf->pid, replacement_lwpid); | |
520 | if (!replacement_lwpid_str.empty ()) | |
521 | replacement_lwpid_str += ", "; | |
522 | replacement_lwpid_str += target_pid_to_str (ptid); | |
523 | } | |
524 | ||
525 | iter++; | |
526 | } | |
527 | ||
528 | if (replacement_lwpid != 0) | |
529 | { | |
530 | const char *name = bfd_section_name (sect); | |
531 | size_t len = strlen (name); | |
532 | ||
533 | if (strncmp (name + len - 2, "/0", 2) == 0) | |
534 | { | |
535 | /* This section needs a new name. */ | |
536 | std::string name_str | |
537 | = string_printf ("%.*s/%d", | |
538 | static_cast<int> (len - 2), | |
539 | name, replacement_lwpid); | |
540 | char *name_buf | |
541 | = static_cast<char *> (bfd_alloc (abfd, name_str.size () + 1)); | |
542 | if (name_buf == nullptr) | |
543 | error (_("failed to allocate space for section name '%s'"), | |
544 | name_str.c_str ()); | |
545 | memcpy (name_buf, name_str.c_str(), name_str.size () + 1); | |
546 | bfd_rename_section (sect, name_buf); | |
547 | } | |
548 | } | |
549 | } | |
550 | ||
551 | if (zero_lwpid_count == 1) | |
552 | warning (_("found thread with pid 0, assigned replacement Target Id: %s"), | |
553 | replacement_lwpid_str.c_str ()); | |
554 | else | |
555 | warning (_("found threads with pid 0, assigned replacement Target Ids: %s"), | |
556 | replacement_lwpid_str.c_str ()); | |
557 | } | |
558 | ||
aa2d5a42 KS |
559 | /* Locate (and load) an executable file (and symbols) given the core file |
560 | BFD ABFD. */ | |
561 | ||
562 | static void | |
563 | locate_exec_from_corefile_build_id (bfd *abfd, int from_tty) | |
564 | { | |
565 | const bfd_build_id *build_id = build_id_bfd_get (abfd); | |
566 | if (build_id == nullptr) | |
567 | return; | |
568 | ||
569 | gdb_bfd_ref_ptr execbfd | |
570 | = build_id_to_exec_bfd (build_id->size, build_id->data); | |
571 | ||
b91f93a0 AM |
572 | if (execbfd == nullptr) |
573 | { | |
574 | /* Attempt to query debuginfod for the executable. */ | |
575 | gdb::unique_xmalloc_ptr<char> execpath; | |
576 | scoped_fd fd = debuginfod_exec_query (build_id->data, build_id->size, | |
577 | abfd->filename, &execpath); | |
578 | ||
579 | if (fd.get () >= 0) | |
580 | { | |
581 | execbfd = gdb_bfd_open (execpath.get (), gnutarget); | |
582 | ||
583 | if (execbfd == nullptr) | |
584 | warning (_("\"%s\" from debuginfod cannot be opened as bfd: %s"), | |
585 | execpath.get (), | |
586 | gdb_bfd_errmsg (bfd_get_error (), nullptr).c_str ()); | |
587 | else if (!build_id_verify (execbfd.get (), build_id->size, | |
588 | build_id->data)) | |
589 | execbfd.reset (nullptr); | |
590 | } | |
591 | } | |
592 | ||
aa2d5a42 KS |
593 | if (execbfd != nullptr) |
594 | { | |
595 | exec_file_attach (bfd_get_filename (execbfd.get ()), from_tty); | |
596 | symbol_file_add_main (bfd_get_filename (execbfd.get ()), | |
597 | symfile_add_flag (from_tty ? SYMFILE_VERBOSE : 0)); | |
598 | } | |
599 | } | |
600 | ||
d9f719f1 | 601 | /* See gdbcore.h. */ |
c906108c | 602 | |
f6ac5f3d | 603 | void |
d9f719f1 | 604 | core_target_open (const char *arg, int from_tty) |
c906108c SS |
605 | { |
606 | const char *p; | |
607 | int siggy; | |
c906108c | 608 | int scratch_chan; |
ee28ca0f | 609 | int flags; |
c906108c SS |
610 | |
611 | target_preopen (from_tty); | |
014f9477 | 612 | if (!arg) |
c906108c | 613 | { |
8a3fe4f8 | 614 | if (core_bfd) |
3e43a32a MS |
615 | error (_("No core file specified. (Use `detach' " |
616 | "to stop debugging a core file.)")); | |
8a3fe4f8 AC |
617 | else |
618 | error (_("No core file specified.")); | |
c906108c SS |
619 | } |
620 | ||
ee0c3293 | 621 | gdb::unique_xmalloc_ptr<char> filename (tilde_expand (arg)); |
f947f967 TV |
622 | if (strlen (filename.get ()) != 0 |
623 | && !IS_ABSOLUTE_PATH (filename.get ())) | |
7ab2607f | 624 | filename = make_unique_xstrdup (gdb_abspath (filename.get ()).c_str ()); |
c906108c | 625 | |
ee28ca0f AC |
626 | flags = O_BINARY | O_LARGEFILE; |
627 | if (write_files) | |
628 | flags |= O_RDWR; | |
629 | else | |
630 | flags |= O_RDONLY; | |
13084383 | 631 | scratch_chan = gdb_open_cloexec (filename.get (), flags, 0).release (); |
c906108c | 632 | if (scratch_chan < 0) |
ee0c3293 | 633 | perror_with_name (filename.get ()); |
c906108c | 634 | |
ee0c3293 | 635 | gdb_bfd_ref_ptr temp_bfd (gdb_bfd_fopen (filename.get (), gnutarget, |
192b62ce TT |
636 | write_files ? FOPEN_RUB : FOPEN_RB, |
637 | scratch_chan)); | |
c906108c | 638 | if (temp_bfd == NULL) |
ee0c3293 | 639 | perror_with_name (filename.get ()); |
c906108c | 640 | |
6ba0a321 | 641 | if (!bfd_check_format (temp_bfd.get (), bfd_core)) |
c906108c SS |
642 | { |
643 | /* Do it after the err msg */ | |
aff410f1 | 644 | /* FIXME: should be checking for errors from bfd_close (for one |
dda83cd7 SM |
645 | thing, on error it does not free all the storage associated |
646 | with the bfd). */ | |
8a3fe4f8 | 647 | error (_("\"%s\" is not a core dump: %s"), |
ee0c3293 | 648 | filename.get (), bfd_errmsg (bfd_get_error ())); |
c906108c SS |
649 | } |
650 | ||
06333fea | 651 | current_program_space->cbfd = std::move (temp_bfd); |
c906108c | 652 | |
15244507 | 653 | core_target *target = new core_target (); |
0e24ac5d | 654 | |
15244507 PA |
655 | /* Own the target until it is successfully pushed. */ |
656 | target_ops_up target_holder (target); | |
2acceee2 | 657 | |
c906108c SS |
658 | validate_files (); |
659 | ||
2f1b5984 MK |
660 | /* If we have no exec file, try to set the architecture from the |
661 | core file. We don't do this unconditionally since an exec file | |
662 | typically contains more information that helps us determine the | |
663 | architecture than a core file. */ | |
7e10abd1 | 664 | if (!current_program_space->exec_bfd ()) |
2f1b5984 | 665 | set_gdbarch_from_file (core_bfd); |
cbda0a99 | 666 | |
02980c56 | 667 | current_inferior ()->push_target (std::move (target_holder)); |
c906108c | 668 | |
60db1b85 | 669 | switch_to_no_thread (); |
0de3b513 | 670 | |
739fc47a PA |
671 | /* Need to flush the register cache (and the frame cache) from a |
672 | previous debug session. If inferior_ptid ends up the same as the | |
673 | last debug session --- e.g., b foo; run; gcore core1; step; gcore | |
674 | core2; core core1; core core2 --- then there's potential for | |
675 | get_current_regcache to return the cached regcache of the | |
676 | previous session, and the frame cache being stale. */ | |
677 | registers_changed (); | |
678 | ||
22ed0412 AB |
679 | /* Find (or fake) the pid for the process in this core file, and |
680 | initialise the current inferior with that pid. */ | |
681 | bool fake_pid_p = false; | |
682 | int pid = bfd_core_file_pid (core_bfd); | |
683 | if (pid == 0) | |
684 | { | |
685 | fake_pid_p = true; | |
686 | pid = CORELOW_PID; | |
687 | } | |
688 | ||
689 | inferior *inf = current_inferior (); | |
690 | gdb_assert (inf->pid == 0); | |
691 | inferior_appeared (inf, pid); | |
692 | inf->fake_pid_p = fake_pid_p; | |
693 | ||
08796916 AB |
694 | /* Rename any .reg/0 sections, giving them each a fake lwpid. */ |
695 | rename_vmcore_idle_reg_sections (core_bfd, inf); | |
696 | ||
0de3b513 PA |
697 | /* Build up thread list from BFD sections, and possibly set the |
698 | current thread to the .reg/NN section matching the .reg | |
aff410f1 | 699 | section. */ |
a190fabb TT |
700 | asection *reg_sect = bfd_get_section_by_name (core_bfd, ".reg"); |
701 | for (asection *sect : gdb_bfd_sections (core_bfd)) | |
22ed0412 | 702 | add_to_thread_list (sect, reg_sect, inf); |
0de3b513 | 703 | |
d7e15655 | 704 | if (inferior_ptid == null_ptid) |
3cdd9356 PA |
705 | { |
706 | /* Either we found no .reg/NN section, and hence we have a | |
707 | non-threaded core (single-threaded, from gdb's perspective), | |
708 | or for some reason add_to_thread_list couldn't determine | |
709 | which was the "main" thread. The latter case shouldn't | |
710 | usually happen, but we're dealing with input here, which can | |
711 | always be broken in different ways. */ | |
22ed0412 | 712 | thread_info *thread = first_thread_of_inferior (inf); |
c5504eaf | 713 | |
3cdd9356 | 714 | if (thread == NULL) |
22ed0412 | 715 | thread = add_thread_silent (target, ptid_t (CORELOW_PID)); |
60db1b85 PA |
716 | |
717 | switch_to_thread (thread); | |
3cdd9356 PA |
718 | } |
719 | ||
7e10abd1 | 720 | if (current_program_space->exec_bfd () == nullptr) |
aa2d5a42 KS |
721 | locate_exec_from_corefile_build_id (core_bfd, from_tty); |
722 | ||
a7aba266 | 723 | post_create_inferior (from_tty); |
959b8724 | 724 | |
0de3b513 PA |
725 | /* Now go through the target stack looking for threads since there |
726 | may be a thread_stratum target loaded on top of target core by | |
727 | now. The layer above should claim threads found in the BFD | |
728 | sections. */ | |
a70b8144 | 729 | try |
8e7b59a5 | 730 | { |
e8032dde | 731 | target_update_thread_list (); |
8e7b59a5 KS |
732 | } |
733 | ||
230d2906 | 734 | catch (const gdb_exception_error &except) |
492d29ea PA |
735 | { |
736 | exception_print (gdb_stderr, except); | |
737 | } | |
0de3b513 | 738 | |
c906108c SS |
739 | p = bfd_core_file_failing_command (core_bfd); |
740 | if (p) | |
6cb06a8c | 741 | gdb_printf (_("Core was generated by `%s'.\n"), p); |
c906108c | 742 | |
0c557179 SDJ |
743 | /* Clearing any previous state of convenience variables. */ |
744 | clear_exit_convenience_vars (); | |
745 | ||
c906108c SS |
746 | siggy = bfd_core_file_failing_signal (core_bfd); |
747 | if (siggy > 0) | |
423ec54c | 748 | { |
15244507 PA |
749 | gdbarch *core_gdbarch = target->core_gdbarch (); |
750 | ||
22203bbf | 751 | /* If we don't have a CORE_GDBARCH to work with, assume a native |
1f8cf220 PA |
752 | core (map gdb_signal from host signals). If we do have |
753 | CORE_GDBARCH to work with, but no gdb_signal_from_target | |
754 | implementation for that gdbarch, as a fallback measure, | |
755 | assume the host signal mapping. It'll be correct for native | |
756 | cores, but most likely incorrect for cross-cores. */ | |
2ea28649 | 757 | enum gdb_signal sig = (core_gdbarch != NULL |
1f8cf220 PA |
758 | && gdbarch_gdb_signal_from_target_p (core_gdbarch) |
759 | ? gdbarch_gdb_signal_from_target (core_gdbarch, | |
760 | siggy) | |
761 | : gdb_signal_from_host (siggy)); | |
423ec54c | 762 | |
6cb06a8c TT |
763 | gdb_printf (_("Program terminated with signal %s, %s"), |
764 | gdb_signal_to_name (sig), gdb_signal_to_string (sig)); | |
ad97bfc5 JB |
765 | if (gdbarch_report_signal_info_p (core_gdbarch)) |
766 | gdbarch_report_signal_info (core_gdbarch, current_uiout, sig); | |
6cb06a8c | 767 | gdb_printf (_(".\n")); |
0c557179 SDJ |
768 | |
769 | /* Set the value of the internal variable $_exitsignal, | |
770 | which holds the signal uncaught by the inferior. */ | |
771 | set_internalvar_integer (lookup_internalvar ("_exitsignal"), | |
772 | siggy); | |
423ec54c | 773 | } |
c906108c | 774 | |
87ab71f0 | 775 | /* Fetch all registers from core file. */ |
9c742269 | 776 | target_fetch_registers (get_thread_regcache (inferior_thread ()), -1); |
c906108c | 777 | |
87ab71f0 PA |
778 | /* Now, set up the frame cache, and print the top of stack. */ |
779 | reinit_frame_cache (); | |
08d72866 | 780 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1); |
f0e8c4c5 JK |
781 | |
782 | /* Current thread should be NUM 1 but the user does not know that. | |
783 | If a program is single threaded gdb in general does not mention | |
784 | anything about threads. That is why the test is >= 2. */ | |
5b6d1e4f | 785 | if (thread_count (target) >= 2) |
f0e8c4c5 | 786 | { |
a70b8144 | 787 | try |
f0e8c4c5 JK |
788 | { |
789 | thread_command (NULL, from_tty); | |
790 | } | |
230d2906 | 791 | catch (const gdb_exception_error &except) |
492d29ea PA |
792 | { |
793 | exception_print (gdb_stderr, except); | |
794 | } | |
f0e8c4c5 | 795 | } |
c906108c SS |
796 | } |
797 | ||
f6ac5f3d PA |
798 | void |
799 | core_target::detach (inferior *inf, int from_tty) | |
c906108c | 800 | { |
5d067f3d PA |
801 | /* Get rid of the core. Don't rely on core_target::close doing it, |
802 | because target_detach may be called with core_target's refcount > 1, | |
803 | meaning core_target::close may not be called yet by the | |
804 | unpush_target call below. */ | |
805 | clear_core (); | |
806 | ||
807 | /* Note that 'this' may be dangling after this call. unpush_target | |
808 | closes the target if the refcount reaches 0, and our close | |
809 | implementation deletes 'this'. */ | |
fadf6add | 810 | inf->unpush_target (this); |
15244507 | 811 | |
66452beb PW |
812 | /* Clear the register cache and the frame cache. */ |
813 | registers_changed (); | |
c906108c | 814 | reinit_frame_cache (); |
451953fa | 815 | maybe_say_no_core_file_now (from_tty); |
c906108c SS |
816 | } |
817 | ||
de57eccd | 818 | /* Try to retrieve registers from a section in core_bfd, and supply |
6ba0a321 | 819 | them to REGSET. |
de57eccd | 820 | |
11a33714 SM |
821 | If ptid's lwp member is zero, do the single-threaded |
822 | thing: look for a section named NAME. If ptid's lwp | |
0de3b513 PA |
823 | member is non-zero, do the multi-threaded thing: look for a section |
824 | named "NAME/LWP", where LWP is the shortest ASCII decimal | |
11a33714 | 825 | representation of ptid's lwp member. |
de57eccd JM |
826 | |
827 | HUMAN_NAME is a human-readable name for the kind of registers the | |
828 | NAME section contains, for use in error messages. | |
829 | ||
15244507 PA |
830 | If REQUIRED is true, print an error if the core file doesn't have a |
831 | section by the appropriate name. Otherwise, just do nothing. */ | |
de57eccd | 832 | |
15244507 PA |
833 | void |
834 | core_target::get_core_register_section (struct regcache *regcache, | |
835 | const struct regset *regset, | |
836 | const char *name, | |
dbd534fe | 837 | int section_min_size, |
15244507 PA |
838 | const char *human_name, |
839 | bool required) | |
de57eccd | 840 | { |
6ba0a321 CB |
841 | gdb_assert (regset != nullptr); |
842 | ||
7be0c536 | 843 | struct bfd_section *section; |
de57eccd | 844 | bfd_size_type size; |
6ba0a321 | 845 | bool variable_size_section = (regset->flags & REGSET_VARIABLE_SIZE); |
de57eccd | 846 | |
3c3ae77e | 847 | thread_section_name section_name (name, regcache->ptid ()); |
de57eccd | 848 | |
3c3ae77e | 849 | section = bfd_get_section_by_name (core_bfd, section_name.c_str ()); |
de57eccd JM |
850 | if (! section) |
851 | { | |
852 | if (required) | |
aff410f1 MS |
853 | warning (_("Couldn't find %s registers in core file."), |
854 | human_name); | |
de57eccd JM |
855 | return; |
856 | } | |
857 | ||
fd361982 | 858 | size = bfd_section_size (section); |
dbd534fe | 859 | if (size < section_min_size) |
8f0435f7 | 860 | { |
3c3ae77e PA |
861 | warning (_("Section `%s' in core file too small."), |
862 | section_name.c_str ()); | |
8f0435f7 AA |
863 | return; |
864 | } | |
dbd534fe | 865 | if (size != section_min_size && !variable_size_section) |
f962539a AA |
866 | { |
867 | warning (_("Unexpected size of section `%s' in core file."), | |
3c3ae77e | 868 | section_name.c_str ()); |
f962539a | 869 | } |
8f0435f7 | 870 | |
0cac9354 | 871 | gdb::byte_vector contents (size); |
d8b2f9e3 SM |
872 | if (!bfd_get_section_contents (core_bfd, section, contents.data (), |
873 | (file_ptr) 0, size)) | |
de57eccd | 874 | { |
8a3fe4f8 | 875 | warning (_("Couldn't read %s registers from `%s' section in core file."), |
3c3ae77e | 876 | human_name, section_name.c_str ()); |
de57eccd JM |
877 | return; |
878 | } | |
879 | ||
6ba0a321 | 880 | regset->supply_regset (regset, regcache, -1, contents.data (), size); |
de57eccd JM |
881 | } |
882 | ||
15244507 PA |
883 | /* Data passed to gdbarch_iterate_over_regset_sections's callback. */ |
884 | struct get_core_registers_cb_data | |
885 | { | |
886 | core_target *target; | |
887 | struct regcache *regcache; | |
888 | }; | |
889 | ||
5aa82d05 AA |
890 | /* Callback for get_core_registers that handles a single core file |
891 | register note section. */ | |
892 | ||
893 | static void | |
a616bb94 | 894 | get_core_registers_cb (const char *sect_name, int supply_size, int collect_size, |
8f0435f7 | 895 | const struct regset *regset, |
5aa82d05 AA |
896 | const char *human_name, void *cb_data) |
897 | { | |
6ba0a321 CB |
898 | gdb_assert (regset != nullptr); |
899 | ||
15244507 PA |
900 | auto *data = (get_core_registers_cb_data *) cb_data; |
901 | bool required = false; | |
6ba0a321 | 902 | bool variable_size_section = (regset->flags & REGSET_VARIABLE_SIZE); |
a616bb94 AH |
903 | |
904 | if (!variable_size_section) | |
905 | gdb_assert (supply_size == collect_size); | |
5aa82d05 AA |
906 | |
907 | if (strcmp (sect_name, ".reg") == 0) | |
8f0435f7 | 908 | { |
15244507 | 909 | required = true; |
8f0435f7 AA |
910 | if (human_name == NULL) |
911 | human_name = "general-purpose"; | |
912 | } | |
5aa82d05 | 913 | else if (strcmp (sect_name, ".reg2") == 0) |
8f0435f7 AA |
914 | { |
915 | if (human_name == NULL) | |
916 | human_name = "floating-point"; | |
917 | } | |
918 | ||
15244507 | 919 | data->target->get_core_register_section (data->regcache, regset, sect_name, |
6ba0a321 | 920 | supply_size, human_name, required); |
5aa82d05 | 921 | } |
de57eccd | 922 | |
c906108c SS |
923 | /* Get the registers out of a core file. This is the machine- |
924 | independent part. Fetch_core_registers is the machine-dependent | |
aff410f1 MS |
925 | part, typically implemented in the xm-file for each |
926 | architecture. */ | |
c906108c SS |
927 | |
928 | /* We just get all the registers, so we don't use regno. */ | |
929 | ||
f6ac5f3d PA |
930 | void |
931 | core_target::fetch_registers (struct regcache *regcache, int regno) | |
c906108c | 932 | { |
15244507 | 933 | if (!(m_core_gdbarch != nullptr |
6ba0a321 | 934 | && gdbarch_iterate_over_regset_sections_p (m_core_gdbarch))) |
c906108c | 935 | { |
6cb06a8c TT |
936 | gdb_printf (gdb_stderr, |
937 | "Can't fetch registers from this type of core file\n"); | |
c906108c SS |
938 | return; |
939 | } | |
940 | ||
6ba0a321 CB |
941 | struct gdbarch *gdbarch = regcache->arch (); |
942 | get_core_registers_cb_data data = { this, regcache }; | |
943 | gdbarch_iterate_over_regset_sections (gdbarch, | |
944 | get_core_registers_cb, | |
945 | (void *) &data, NULL); | |
c906108c | 946 | |
ee99023e | 947 | /* Mark all registers not found in the core as unavailable. */ |
6ba0a321 | 948 | for (int i = 0; i < gdbarch_num_regs (regcache->arch ()); i++) |
0ec9f114 | 949 | if (regcache->get_register_status (i) == REG_UNKNOWN) |
73e1c03f | 950 | regcache->raw_supply (i, NULL); |
c906108c SS |
951 | } |
952 | ||
f6ac5f3d PA |
953 | void |
954 | core_target::files_info () | |
c906108c | 955 | { |
15244507 | 956 | print_section_info (&m_core_section_table, core_bfd); |
c906108c | 957 | } |
e2544d02 | 958 | \f |
973695d6 KB |
959 | /* Helper method for core_target::xfer_partial. */ |
960 | ||
961 | enum target_xfer_status | |
962 | core_target::xfer_memory_via_mappings (gdb_byte *readbuf, | |
963 | const gdb_byte *writebuf, | |
964 | ULONGEST offset, ULONGEST len, | |
965 | ULONGEST *xfered_len) | |
966 | { | |
967 | enum target_xfer_status xfer_status; | |
968 | ||
969 | xfer_status = (section_table_xfer_memory_partial | |
970 | (readbuf, writebuf, | |
971 | offset, len, xfered_len, | |
bb2a6777 | 972 | m_core_file_mappings)); |
973695d6 KB |
973 | |
974 | if (xfer_status == TARGET_XFER_OK || m_core_unavailable_mappings.empty ()) | |
975 | return xfer_status; | |
976 | ||
977 | /* There are instances - e.g. when debugging within a docker | |
978 | container using the AUFS storage driver - where the pathnames | |
979 | obtained from the note section are incorrect. Despite the path | |
980 | being wrong, just knowing the start and end addresses of the | |
981 | mappings is still useful; we can attempt an access of the file | |
982 | stratum constrained to the address ranges corresponding to the | |
983 | unavailable mappings. */ | |
984 | ||
985 | ULONGEST memaddr = offset; | |
986 | ULONGEST memend = offset + len; | |
987 | ||
988 | for (const auto &mr : m_core_unavailable_mappings) | |
989 | { | |
990 | if (address_in_mem_range (memaddr, &mr)) | |
dda83cd7 | 991 | { |
973695d6 KB |
992 | if (!address_in_mem_range (memend, &mr)) |
993 | len = mr.start + mr.length - memaddr; | |
994 | ||
995 | xfer_status = this->beneath ()->xfer_partial (TARGET_OBJECT_MEMORY, | |
996 | NULL, | |
997 | readbuf, | |
998 | writebuf, | |
999 | offset, | |
1000 | len, | |
1001 | xfered_len); | |
1002 | break; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | return xfer_status; | |
1007 | } | |
1008 | ||
f6ac5f3d PA |
1009 | enum target_xfer_status |
1010 | core_target::xfer_partial (enum target_object object, const char *annex, | |
1011 | gdb_byte *readbuf, const gdb_byte *writebuf, | |
1012 | ULONGEST offset, ULONGEST len, ULONGEST *xfered_len) | |
e2544d02 RM |
1013 | { |
1014 | switch (object) | |
1015 | { | |
1016 | case TARGET_OBJECT_MEMORY: | |
2735d421 KB |
1017 | { |
1018 | enum target_xfer_status xfer_status; | |
1019 | ||
1020 | /* Try accessing memory contents from core file data, | |
1021 | restricting consideration to those sections for which | |
1022 | the BFD section flag SEC_HAS_CONTENTS is set. */ | |
1023 | auto has_contents_cb = [] (const struct target_section *s) | |
1024 | { | |
1025 | return ((s->the_bfd_section->flags & SEC_HAS_CONTENTS) != 0); | |
1026 | }; | |
1027 | xfer_status = section_table_xfer_memory_partial | |
1028 | (readbuf, writebuf, | |
1029 | offset, len, xfered_len, | |
bb2a6777 | 1030 | m_core_section_table, |
2735d421 KB |
1031 | has_contents_cb); |
1032 | if (xfer_status == TARGET_XFER_OK) | |
1033 | return TARGET_XFER_OK; | |
1034 | ||
db082f59 KB |
1035 | /* Check file backed mappings. If they're available, use |
1036 | core file provided mappings (e.g. from .note.linuxcore.file | |
1037 | or the like) as this should provide a more accurate | |
1038 | result. If not, check the stratum beneath us, which should | |
1bd57575 LM |
1039 | be the file stratum. |
1040 | ||
1041 | We also check unavailable mappings due to Docker/AUFS driver | |
1042 | issues. */ | |
1043 | if (!m_core_file_mappings.empty () | |
1044 | || !m_core_unavailable_mappings.empty ()) | |
1045 | { | |
1046 | xfer_status = xfer_memory_via_mappings (readbuf, writebuf, offset, | |
1047 | len, xfered_len); | |
1048 | } | |
db082f59 KB |
1049 | else |
1050 | xfer_status = this->beneath ()->xfer_partial (object, annex, readbuf, | |
1051 | writebuf, offset, len, | |
1052 | xfered_len); | |
2735d421 KB |
1053 | if (xfer_status == TARGET_XFER_OK) |
1054 | return TARGET_XFER_OK; | |
e2544d02 | 1055 | |
2735d421 KB |
1056 | /* Finally, attempt to access data in core file sections with |
1057 | no contents. These will typically read as all zero. */ | |
1058 | auto no_contents_cb = [&] (const struct target_section *s) | |
1059 | { | |
1060 | return !has_contents_cb (s); | |
1061 | }; | |
1062 | xfer_status = section_table_xfer_memory_partial | |
1063 | (readbuf, writebuf, | |
1064 | offset, len, xfered_len, | |
bb2a6777 | 1065 | m_core_section_table, |
2735d421 KB |
1066 | no_contents_cb); |
1067 | ||
1068 | return xfer_status; | |
1069 | } | |
e2544d02 RM |
1070 | case TARGET_OBJECT_AUXV: |
1071 | if (readbuf) | |
1072 | { | |
1073 | /* When the aux vector is stored in core file, BFD | |
1074 | represents this with a fake section called ".auxv". */ | |
1075 | ||
c4c5b7ba | 1076 | struct bfd_section *section; |
e2544d02 | 1077 | bfd_size_type size; |
e2544d02 RM |
1078 | |
1079 | section = bfd_get_section_by_name (core_bfd, ".auxv"); | |
1080 | if (section == NULL) | |
2ed4b548 | 1081 | return TARGET_XFER_E_IO; |
e2544d02 | 1082 | |
fd361982 | 1083 | size = bfd_section_size (section); |
e2544d02 | 1084 | if (offset >= size) |
9b409511 | 1085 | return TARGET_XFER_EOF; |
e2544d02 RM |
1086 | size -= offset; |
1087 | if (size > len) | |
1088 | size = len; | |
9b409511 YQ |
1089 | |
1090 | if (size == 0) | |
1091 | return TARGET_XFER_EOF; | |
1092 | if (!bfd_get_section_contents (core_bfd, section, readbuf, | |
1093 | (file_ptr) offset, size)) | |
e2544d02 | 1094 | { |
8a3fe4f8 | 1095 | warning (_("Couldn't read NT_AUXV note in core file.")); |
2ed4b548 | 1096 | return TARGET_XFER_E_IO; |
e2544d02 RM |
1097 | } |
1098 | ||
9b409511 YQ |
1099 | *xfered_len = (ULONGEST) size; |
1100 | return TARGET_XFER_OK; | |
e2544d02 | 1101 | } |
2ed4b548 | 1102 | return TARGET_XFER_E_IO; |
e2544d02 | 1103 | |
403e1656 MK |
1104 | case TARGET_OBJECT_WCOOKIE: |
1105 | if (readbuf) | |
1106 | { | |
1107 | /* When the StackGhost cookie is stored in core file, BFD | |
aff410f1 MS |
1108 | represents this with a fake section called |
1109 | ".wcookie". */ | |
403e1656 MK |
1110 | |
1111 | struct bfd_section *section; | |
1112 | bfd_size_type size; | |
403e1656 MK |
1113 | |
1114 | section = bfd_get_section_by_name (core_bfd, ".wcookie"); | |
1115 | if (section == NULL) | |
2ed4b548 | 1116 | return TARGET_XFER_E_IO; |
403e1656 | 1117 | |
fd361982 | 1118 | size = bfd_section_size (section); |
403e1656 | 1119 | if (offset >= size) |
96c4f946 | 1120 | return TARGET_XFER_EOF; |
403e1656 MK |
1121 | size -= offset; |
1122 | if (size > len) | |
1123 | size = len; | |
9b409511 YQ |
1124 | |
1125 | if (size == 0) | |
1126 | return TARGET_XFER_EOF; | |
1127 | if (!bfd_get_section_contents (core_bfd, section, readbuf, | |
1128 | (file_ptr) offset, size)) | |
403e1656 | 1129 | { |
8a3fe4f8 | 1130 | warning (_("Couldn't read StackGhost cookie in core file.")); |
2ed4b548 | 1131 | return TARGET_XFER_E_IO; |
403e1656 MK |
1132 | } |
1133 | ||
9b409511 YQ |
1134 | *xfered_len = (ULONGEST) size; |
1135 | return TARGET_XFER_OK; | |
1136 | ||
403e1656 | 1137 | } |
2ed4b548 | 1138 | return TARGET_XFER_E_IO; |
403e1656 | 1139 | |
de584861 | 1140 | case TARGET_OBJECT_LIBRARIES: |
15244507 PA |
1141 | if (m_core_gdbarch != nullptr |
1142 | && gdbarch_core_xfer_shared_libraries_p (m_core_gdbarch)) | |
de584861 PA |
1143 | { |
1144 | if (writebuf) | |
2ed4b548 | 1145 | return TARGET_XFER_E_IO; |
9b409511 YQ |
1146 | else |
1147 | { | |
15244507 | 1148 | *xfered_len = gdbarch_core_xfer_shared_libraries (m_core_gdbarch, |
9b409511 YQ |
1149 | readbuf, |
1150 | offset, len); | |
1151 | ||
1152 | if (*xfered_len == 0) | |
1153 | return TARGET_XFER_EOF; | |
1154 | else | |
1155 | return TARGET_XFER_OK; | |
1156 | } | |
de584861 | 1157 | } |
0e30a3b0 | 1158 | return TARGET_XFER_E_IO; |
de584861 | 1159 | |
356a5233 | 1160 | case TARGET_OBJECT_LIBRARIES_AIX: |
15244507 PA |
1161 | if (m_core_gdbarch != nullptr |
1162 | && gdbarch_core_xfer_shared_libraries_aix_p (m_core_gdbarch)) | |
356a5233 JB |
1163 | { |
1164 | if (writebuf) | |
2ed4b548 | 1165 | return TARGET_XFER_E_IO; |
9b409511 YQ |
1166 | else |
1167 | { | |
1168 | *xfered_len | |
15244507 | 1169 | = gdbarch_core_xfer_shared_libraries_aix (m_core_gdbarch, |
9b409511 YQ |
1170 | readbuf, offset, |
1171 | len); | |
1172 | ||
1173 | if (*xfered_len == 0) | |
1174 | return TARGET_XFER_EOF; | |
1175 | else | |
1176 | return TARGET_XFER_OK; | |
1177 | } | |
356a5233 | 1178 | } |
0e30a3b0 | 1179 | return TARGET_XFER_E_IO; |
356a5233 | 1180 | |
9015683b TT |
1181 | case TARGET_OBJECT_SIGNAL_INFO: |
1182 | if (readbuf) | |
9b409511 | 1183 | { |
15244507 PA |
1184 | if (m_core_gdbarch != nullptr |
1185 | && gdbarch_core_xfer_siginfo_p (m_core_gdbarch)) | |
9b409511 | 1186 | { |
15244507 | 1187 | LONGEST l = gdbarch_core_xfer_siginfo (m_core_gdbarch, readbuf, |
382b69bb JB |
1188 | offset, len); |
1189 | ||
1190 | if (l >= 0) | |
1191 | { | |
1192 | *xfered_len = l; | |
1193 | if (l == 0) | |
1194 | return TARGET_XFER_EOF; | |
1195 | else | |
1196 | return TARGET_XFER_OK; | |
1197 | } | |
9b409511 YQ |
1198 | } |
1199 | } | |
2ed4b548 | 1200 | return TARGET_XFER_E_IO; |
9015683b | 1201 | |
e2544d02 | 1202 | default: |
b6a8c27b PA |
1203 | return this->beneath ()->xfer_partial (object, annex, readbuf, |
1204 | writebuf, offset, len, | |
1205 | xfered_len); | |
e2544d02 RM |
1206 | } |
1207 | } | |
1208 | ||
c906108c | 1209 | \f |
c906108c SS |
1210 | |
1211 | /* Okay, let's be honest: threads gleaned from a core file aren't | |
1212 | exactly lively, are they? On the other hand, if we don't claim | |
1213 | that each & every one is alive, then we don't get any of them | |
1214 | to appear in an "info thread" command, which is quite a useful | |
1215 | behaviour. | |
c5aa993b | 1216 | */ |
57810aa7 | 1217 | bool |
f6ac5f3d | 1218 | core_target::thread_alive (ptid_t ptid) |
c906108c | 1219 | { |
57810aa7 | 1220 | return true; |
c906108c SS |
1221 | } |
1222 | ||
4eb0ad19 DJ |
1223 | /* Ask the current architecture what it knows about this core file. |
1224 | That will be used, in turn, to pick a better architecture. This | |
1225 | wrapper could be avoided if targets got a chance to specialize | |
15244507 | 1226 | core_target. */ |
4eb0ad19 | 1227 | |
f6ac5f3d PA |
1228 | const struct target_desc * |
1229 | core_target::read_description () | |
4eb0ad19 | 1230 | { |
b93d537f LM |
1231 | /* First check whether the target wants us to use the corefile target |
1232 | description notes. */ | |
1233 | if (gdbarch_use_target_description_from_corefile_notes (m_core_gdbarch, | |
1234 | core_bfd)) | |
95ce627a | 1235 | { |
b93d537f LM |
1236 | /* If the core file contains a target description note then go ahead and |
1237 | use that. */ | |
1238 | bfd_size_type tdesc_note_size = 0; | |
1239 | struct bfd_section *tdesc_note_section | |
1240 | = bfd_get_section_by_name (core_bfd, ".gdb-tdesc"); | |
1241 | if (tdesc_note_section != nullptr) | |
1242 | tdesc_note_size = bfd_section_size (tdesc_note_section); | |
1243 | if (tdesc_note_size > 0) | |
95ce627a | 1244 | { |
b93d537f LM |
1245 | gdb::char_vector contents (tdesc_note_size + 1); |
1246 | if (bfd_get_section_contents (core_bfd, tdesc_note_section, | |
1247 | contents.data (), (file_ptr) 0, | |
1248 | tdesc_note_size)) | |
1249 | { | |
1250 | /* Ensure we have a null terminator. */ | |
1251 | contents[tdesc_note_size] = '\0'; | |
1252 | const struct target_desc *result | |
1253 | = string_read_description_xml (contents.data ()); | |
1254 | if (result != nullptr) | |
1255 | return result; | |
1256 | } | |
95ce627a AB |
1257 | } |
1258 | } | |
1259 | ||
b93d537f LM |
1260 | /* If the architecture provides a corefile target description hook, use |
1261 | it now. Even if the core file contains a target description in a note | |
1262 | section, it is not useful for targets that can potentially have distinct | |
1263 | descriptions for each thread. One example is AArch64's SVE/SME | |
1264 | extensions that allow per-thread vector length changes, resulting in | |
1265 | registers with different sizes. */ | |
15244507 | 1266 | if (m_core_gdbarch && gdbarch_core_read_description_p (m_core_gdbarch)) |
2117c711 TT |
1267 | { |
1268 | const struct target_desc *result; | |
1269 | ||
15244507 | 1270 | result = gdbarch_core_read_description (m_core_gdbarch, this, core_bfd); |
b93d537f | 1271 | if (result != nullptr) |
2117c711 TT |
1272 | return result; |
1273 | } | |
4eb0ad19 | 1274 | |
b6a8c27b | 1275 | return this->beneath ()->read_description (); |
4eb0ad19 DJ |
1276 | } |
1277 | ||
a068643d | 1278 | std::string |
f6ac5f3d | 1279 | core_target::pid_to_str (ptid_t ptid) |
0de3b513 | 1280 | { |
88f38a04 | 1281 | struct inferior *inf; |
a5ee0f0c | 1282 | int pid; |
0de3b513 | 1283 | |
a5ee0f0c PA |
1284 | /* The preferred way is to have a gdbarch/OS specific |
1285 | implementation. */ | |
15244507 PA |
1286 | if (m_core_gdbarch != nullptr |
1287 | && gdbarch_core_pid_to_str_p (m_core_gdbarch)) | |
1288 | return gdbarch_core_pid_to_str (m_core_gdbarch, ptid); | |
c5504eaf | 1289 | |
a5ee0f0c PA |
1290 | /* Otherwise, if we don't have one, we'll just fallback to |
1291 | "process", with normal_pid_to_str. */ | |
28439f5e | 1292 | |
a5ee0f0c | 1293 | /* Try the LWPID field first. */ |
e38504b3 | 1294 | pid = ptid.lwp (); |
a5ee0f0c | 1295 | if (pid != 0) |
f2907e49 | 1296 | return normal_pid_to_str (ptid_t (pid)); |
a5ee0f0c PA |
1297 | |
1298 | /* Otherwise, this isn't a "threaded" core -- use the PID field, but | |
1299 | only if it isn't a fake PID. */ | |
5b6d1e4f | 1300 | inf = find_inferior_ptid (this, ptid); |
88f38a04 | 1301 | if (inf != NULL && !inf->fake_pid_p) |
a5ee0f0c | 1302 | return normal_pid_to_str (ptid); |
0de3b513 | 1303 | |
a5ee0f0c | 1304 | /* No luck. We simply don't have a valid PID to print. */ |
a068643d | 1305 | return "<main task>"; |
0de3b513 PA |
1306 | } |
1307 | ||
f6ac5f3d PA |
1308 | const char * |
1309 | core_target::thread_name (struct thread_info *thr) | |
4dfc5dbc | 1310 | { |
15244507 PA |
1311 | if (m_core_gdbarch != nullptr |
1312 | && gdbarch_core_thread_name_p (m_core_gdbarch)) | |
1313 | return gdbarch_core_thread_name (m_core_gdbarch, thr); | |
4dfc5dbc JB |
1314 | return NULL; |
1315 | } | |
1316 | ||
57810aa7 | 1317 | bool |
f6ac5f3d | 1318 | core_target::has_memory () |
c35b1492 PA |
1319 | { |
1320 | return (core_bfd != NULL); | |
1321 | } | |
1322 | ||
57810aa7 | 1323 | bool |
f6ac5f3d | 1324 | core_target::has_stack () |
c35b1492 PA |
1325 | { |
1326 | return (core_bfd != NULL); | |
1327 | } | |
1328 | ||
57810aa7 | 1329 | bool |
f6ac5f3d | 1330 | core_target::has_registers () |
c35b1492 PA |
1331 | { |
1332 | return (core_bfd != NULL); | |
1333 | } | |
1334 | ||
451b7c33 TT |
1335 | /* Implement the to_info_proc method. */ |
1336 | ||
f6ac5f3d PA |
1337 | bool |
1338 | core_target::info_proc (const char *args, enum info_proc_what request) | |
451b7c33 TT |
1339 | { |
1340 | struct gdbarch *gdbarch = get_current_arch (); | |
1341 | ||
1342 | /* Since this is the core file target, call the 'core_info_proc' | |
1343 | method on gdbarch, not 'info_proc'. */ | |
1344 | if (gdbarch_core_info_proc_p (gdbarch)) | |
1345 | gdbarch_core_info_proc (gdbarch, args, request); | |
c906108c | 1346 | |
f6ac5f3d | 1347 | return true; |
c906108c SS |
1348 | } |
1349 | ||
68cffbbd LM |
1350 | /* Implementation of the "supports_memory_tagging" target_ops method. */ |
1351 | ||
1352 | bool | |
1353 | core_target::supports_memory_tagging () | |
1354 | { | |
1355 | /* Look for memory tag sections. If they exist, that means this core file | |
1356 | supports memory tagging. */ | |
1357 | ||
1358 | return (bfd_get_section_by_name (core_bfd, "memtag") != nullptr); | |
1359 | } | |
1360 | ||
1361 | /* Implementation of the "fetch_memtags" target_ops method. */ | |
1362 | ||
1363 | bool | |
1364 | core_target::fetch_memtags (CORE_ADDR address, size_t len, | |
1365 | gdb::byte_vector &tags, int type) | |
1366 | { | |
99d9c3b9 | 1367 | gdbarch *gdbarch = current_inferior ()->arch (); |
68cffbbd LM |
1368 | |
1369 | /* Make sure we have a way to decode the memory tag notes. */ | |
1370 | if (!gdbarch_decode_memtag_section_p (gdbarch)) | |
1371 | error (_("gdbarch_decode_memtag_section not implemented for this " | |
1372 | "architecture.")); | |
1373 | ||
1374 | memtag_section_info info; | |
1375 | info.memtag_section = nullptr; | |
1376 | ||
1377 | while (get_next_core_memtag_section (core_bfd, info.memtag_section, | |
1378 | address, info)) | |
1379 | { | |
1380 | size_t adjusted_length | |
1381 | = (address + len < info.end_address) ? len : (info.end_address - address); | |
1382 | ||
1383 | /* Decode the memory tag note and return the tags. */ | |
1384 | gdb::byte_vector tags_read | |
1385 | = gdbarch_decode_memtag_section (gdbarch, info.memtag_section, type, | |
1386 | address, adjusted_length); | |
1387 | ||
1388 | /* Transfer over the tags that have been read. */ | |
1389 | tags.insert (tags.end (), tags_read.begin (), tags_read.end ()); | |
1390 | ||
1391 | /* ADDRESS + LEN may cross the boundaries of a particular memory tag | |
1392 | segment. Check if we need to fetch tags from a different section. */ | |
1393 | if (!tags_read.empty () && (address + len) < info.end_address) | |
1394 | return true; | |
1395 | ||
1396 | /* There are more tags to fetch. Update ADDRESS and LEN. */ | |
1397 | len -= (info.end_address - address); | |
1398 | address = info.end_address; | |
1399 | } | |
1400 | ||
1401 | return false; | |
1402 | } | |
1403 | ||
c689d1fe JB |
1404 | /* Implementation of the "fetch_x86_xsave_layout" target_ops method. */ |
1405 | ||
1406 | x86_xsave_layout | |
1407 | core_target::fetch_x86_xsave_layout () | |
1408 | { | |
1409 | if (m_core_gdbarch != nullptr && | |
1410 | gdbarch_core_read_x86_xsave_layout_p (m_core_gdbarch)) | |
1411 | { | |
1412 | x86_xsave_layout layout; | |
1413 | if (!gdbarch_core_read_x86_xsave_layout (m_core_gdbarch, layout)) | |
1414 | return {}; | |
1415 | ||
1416 | return layout; | |
1417 | } | |
1418 | ||
1419 | return {}; | |
1420 | } | |
1421 | ||
09c2f5d4 KB |
1422 | /* Get a pointer to the current core target. If not connected to a |
1423 | core target, return NULL. */ | |
1424 | ||
1425 | static core_target * | |
1426 | get_current_core_target () | |
1427 | { | |
1428 | target_ops *proc_target = current_inferior ()->process_target (); | |
1429 | return dynamic_cast<core_target *> (proc_target); | |
1430 | } | |
1431 | ||
1432 | /* Display file backed mappings from core file. */ | |
1433 | ||
1434 | void | |
1435 | core_target::info_proc_mappings (struct gdbarch *gdbarch) | |
1436 | { | |
d7a78e5c | 1437 | if (!m_core_file_mappings.empty ()) |
09c2f5d4 | 1438 | { |
6cb06a8c | 1439 | gdb_printf (_("Mapped address spaces:\n\n")); |
09c2f5d4 KB |
1440 | if (gdbarch_addr_bit (gdbarch) == 32) |
1441 | { | |
6cb06a8c TT |
1442 | gdb_printf ("\t%10s %10s %10s %10s %s\n", |
1443 | "Start Addr", | |
1444 | " End Addr", | |
1445 | " Size", " Offset", "objfile"); | |
09c2f5d4 KB |
1446 | } |
1447 | else | |
1448 | { | |
6cb06a8c TT |
1449 | gdb_printf (" %18s %18s %10s %10s %s\n", |
1450 | "Start Addr", | |
1451 | " End Addr", | |
1452 | " Size", " Offset", "objfile"); | |
09c2f5d4 KB |
1453 | } |
1454 | } | |
1455 | ||
d7a78e5c | 1456 | for (const target_section &tsp : m_core_file_mappings) |
09c2f5d4 | 1457 | { |
bb2a6777 TT |
1458 | ULONGEST start = tsp.addr; |
1459 | ULONGEST end = tsp.endaddr; | |
1460 | ULONGEST file_ofs = tsp.the_bfd_section->filepos; | |
1461 | const char *filename = bfd_get_filename (tsp.the_bfd_section->owner); | |
09c2f5d4 KB |
1462 | |
1463 | if (gdbarch_addr_bit (gdbarch) == 32) | |
6cb06a8c TT |
1464 | gdb_printf ("\t%10s %10s %10s %10s %s\n", |
1465 | paddress (gdbarch, start), | |
1466 | paddress (gdbarch, end), | |
1467 | hex_string (end - start), | |
1468 | hex_string (file_ofs), | |
1469 | filename); | |
09c2f5d4 | 1470 | else |
6cb06a8c TT |
1471 | gdb_printf (" %18s %18s %10s %10s %s\n", |
1472 | paddress (gdbarch, start), | |
1473 | paddress (gdbarch, end), | |
1474 | hex_string (end - start), | |
1475 | hex_string (file_ofs), | |
1476 | filename); | |
09c2f5d4 KB |
1477 | } |
1478 | } | |
1479 | ||
1480 | /* Implement "maintenance print core-file-backed-mappings" command. | |
1481 | ||
1482 | If mappings are loaded, the results should be similar to the | |
1483 | mappings shown by "info proc mappings". This command is mainly a | |
1484 | debugging tool for GDB developers to make sure that the expected | |
1485 | mappings are present after loading a core file. For Linux, the | |
1486 | output provided by this command will be very similar (if not | |
1487 | identical) to that provided by "info proc mappings". This is not | |
1488 | necessarily the case for other OSes which might provide | |
1489 | more/different information in the "info proc mappings" output. */ | |
1490 | ||
1491 | static void | |
1492 | maintenance_print_core_file_backed_mappings (const char *args, int from_tty) | |
1493 | { | |
1494 | core_target *targ = get_current_core_target (); | |
1495 | if (targ != nullptr) | |
1496 | targ->info_proc_mappings (targ->core_gdbarch ()); | |
1497 | } | |
1498 | ||
6c265988 | 1499 | void _initialize_corelow (); |
c906108c | 1500 | void |
6c265988 | 1501 | _initialize_corelow () |
c906108c | 1502 | { |
d9f719f1 | 1503 | add_target (core_target_info, core_target_open, filename_completer); |
09c2f5d4 | 1504 | add_cmd ("core-file-backed-mappings", class_maintenance, |
dda83cd7 | 1505 | maintenance_print_core_file_backed_mappings, |
513487e1 | 1506 | _("Print core file's file-backed mappings."), |
09c2f5d4 | 1507 | &maintenanceprintlist); |
c906108c | 1508 | } |