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4efc6507 DE |
1 | /* Handle JIT code generation in the inferior for GDB, the GNU Debugger. |
2 | ||
28e7fd62 | 3 | Copyright (C) 2009-2013 Free Software Foundation, Inc. |
4efc6507 DE |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | ||
22 | #include "jit.h" | |
f997c383 | 23 | #include "jit-reader.h" |
1825a88d | 24 | #include "block.h" |
4efc6507 | 25 | #include "breakpoint.h" |
a255712f | 26 | #include "command.h" |
1825a88d | 27 | #include "dictionary.h" |
c9fb1240 | 28 | #include "filenames.h" |
1825a88d | 29 | #include "frame-unwind.h" |
a255712f | 30 | #include "gdbcmd.h" |
4efc6507 | 31 | #include "gdbcore.h" |
03673fc7 | 32 | #include "inferior.h" |
4efc6507 DE |
33 | #include "observer.h" |
34 | #include "objfiles.h" | |
3623dc3a | 35 | #include "regcache.h" |
4efc6507 DE |
36 | #include "symfile.h" |
37 | #include "symtab.h" | |
38 | #include "target.h" | |
784c47ee | 39 | #include "gdb-dlfcn.h" |
4efc6507 | 40 | #include "gdb_stat.h" |
1825a88d | 41 | #include "exceptions.h" |
cbb099e8 | 42 | #include "gdb_bfd.h" |
4efc6507 | 43 | |
b8e0a31c SD |
44 | static const char *jit_reader_dir = NULL; |
45 | ||
4efc6507 DE |
46 | static const struct objfile_data *jit_objfile_data; |
47 | ||
48 | static const char *const jit_break_name = "__jit_debug_register_code"; | |
49 | ||
50 | static const char *const jit_descriptor_name = "__jit_debug_descriptor"; | |
51 | ||
03673fc7 | 52 | static const struct inferior_data *jit_inferior_data = NULL; |
4efc6507 | 53 | |
e2bd3b15 | 54 | static void jit_inferior_init (struct gdbarch *gdbarch); |
3b2a0cf2 | 55 | |
3623dc3a SD |
56 | /* An unwinder is registered for every gdbarch. This key is used to |
57 | remember if the unwinder has been registered for a particular | |
58 | gdbarch. */ | |
59 | ||
60 | static struct gdbarch_data *jit_gdbarch_data; | |
61 | ||
a255712f PP |
62 | /* Non-zero if we want to see trace of jit level stuff. */ |
63 | ||
ccce17b0 | 64 | static unsigned int jit_debug = 0; |
a255712f PP |
65 | |
66 | static void | |
67 | show_jit_debug (struct ui_file *file, int from_tty, | |
68 | struct cmd_list_element *c, const char *value) | |
69 | { | |
70 | fprintf_filtered (file, _("JIT debugging is %s.\n"), value); | |
71 | } | |
72 | ||
4efc6507 DE |
73 | struct target_buffer |
74 | { | |
75 | CORE_ADDR base; | |
a255712f | 76 | ULONGEST size; |
4efc6507 DE |
77 | }; |
78 | ||
79 | /* Openning the file is a no-op. */ | |
80 | ||
81 | static void * | |
82 | mem_bfd_iovec_open (struct bfd *abfd, void *open_closure) | |
83 | { | |
84 | return open_closure; | |
85 | } | |
86 | ||
87 | /* Closing the file is just freeing the base/size pair on our side. */ | |
88 | ||
89 | static int | |
90 | mem_bfd_iovec_close (struct bfd *abfd, void *stream) | |
91 | { | |
92 | xfree (stream); | |
93 | return 1; | |
94 | } | |
95 | ||
96 | /* For reading the file, we just need to pass through to target_read_memory and | |
97 | fix up the arguments and return values. */ | |
98 | ||
99 | static file_ptr | |
100 | mem_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, | |
101 | file_ptr nbytes, file_ptr offset) | |
102 | { | |
103 | int err; | |
104 | struct target_buffer *buffer = (struct target_buffer *) stream; | |
105 | ||
106 | /* If this read will read all of the file, limit it to just the rest. */ | |
107 | if (offset + nbytes > buffer->size) | |
108 | nbytes = buffer->size - offset; | |
109 | ||
110 | /* If there are no more bytes left, we've reached EOF. */ | |
111 | if (nbytes == 0) | |
112 | return 0; | |
113 | ||
114 | err = target_read_memory (buffer->base + offset, (gdb_byte *) buf, nbytes); | |
115 | if (err) | |
116 | return -1; | |
117 | ||
118 | return nbytes; | |
119 | } | |
120 | ||
121 | /* For statting the file, we only support the st_size attribute. */ | |
122 | ||
123 | static int | |
124 | mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb) | |
125 | { | |
126 | struct target_buffer *buffer = (struct target_buffer*) stream; | |
127 | ||
128 | sb->st_size = buffer->size; | |
129 | return 0; | |
130 | } | |
131 | ||
f0bbc364 TT |
132 | /* Open a BFD from the target's memory. */ |
133 | ||
134 | static struct bfd * | |
135 | bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size, char *target) | |
136 | { | |
f0bbc364 TT |
137 | struct target_buffer *buffer = xmalloc (sizeof (struct target_buffer)); |
138 | ||
139 | buffer->base = addr; | |
140 | buffer->size = size; | |
64c31149 TT |
141 | return gdb_bfd_openr_iovec ("<in-memory>", target, |
142 | mem_bfd_iovec_open, | |
143 | buffer, | |
144 | mem_bfd_iovec_pread, | |
145 | mem_bfd_iovec_close, | |
146 | mem_bfd_iovec_stat); | |
f0bbc364 TT |
147 | } |
148 | ||
784c47ee SD |
149 | /* One reader that has been loaded successfully, and can potentially be used to |
150 | parse debug info. */ | |
151 | ||
152 | static struct jit_reader | |
153 | { | |
154 | struct gdb_reader_funcs *functions; | |
155 | void *handle; | |
156 | } *loaded_jit_reader = NULL; | |
157 | ||
158 | typedef struct gdb_reader_funcs * (reader_init_fn_type) (void); | |
159 | static const char *reader_init_fn_sym = "gdb_init_reader"; | |
160 | ||
161 | /* Try to load FILE_NAME as a JIT debug info reader. */ | |
162 | ||
163 | static struct jit_reader * | |
164 | jit_reader_load (const char *file_name) | |
165 | { | |
166 | void *so; | |
167 | reader_init_fn_type *init_fn; | |
168 | struct jit_reader *new_reader = NULL; | |
169 | struct gdb_reader_funcs *funcs = NULL; | |
170 | struct cleanup *old_cleanups; | |
171 | ||
172 | if (jit_debug) | |
173 | fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"), | |
174 | file_name); | |
175 | so = gdb_dlopen (file_name); | |
176 | old_cleanups = make_cleanup_dlclose (so); | |
177 | ||
178 | init_fn = gdb_dlsym (so, reader_init_fn_sym); | |
179 | if (!init_fn) | |
180 | error (_("Could not locate initialization function: %s."), | |
181 | reader_init_fn_sym); | |
182 | ||
183 | if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL) | |
184 | error (_("Reader not GPL compatible.")); | |
185 | ||
186 | funcs = init_fn (); | |
187 | if (funcs->reader_version != GDB_READER_INTERFACE_VERSION) | |
188 | error (_("Reader version does not match GDB version.")); | |
189 | ||
190 | new_reader = XZALLOC (struct jit_reader); | |
191 | new_reader->functions = funcs; | |
192 | new_reader->handle = so; | |
193 | ||
194 | discard_cleanups (old_cleanups); | |
195 | return new_reader; | |
196 | } | |
197 | ||
198 | /* Provides the jit-reader-load command. */ | |
199 | ||
200 | static void | |
201 | jit_reader_load_command (char *args, int from_tty) | |
202 | { | |
203 | char *so_name; | |
784c47ee SD |
204 | struct cleanup *prev_cleanup; |
205 | ||
206 | if (args == NULL) | |
207 | error (_("No reader name provided.")); | |
208 | ||
209 | if (loaded_jit_reader != NULL) | |
210 | error (_("JIT reader already loaded. Run jit-reader-unload first.")); | |
211 | ||
c9fb1240 SD |
212 | if (IS_ABSOLUTE_PATH (args)) |
213 | so_name = xstrdup (args); | |
214 | else | |
215 | so_name = xstrprintf ("%s%s%s", SLASH_STRING, jit_reader_dir, args); | |
784c47ee SD |
216 | prev_cleanup = make_cleanup (xfree, so_name); |
217 | ||
218 | loaded_jit_reader = jit_reader_load (so_name); | |
219 | do_cleanups (prev_cleanup); | |
220 | } | |
221 | ||
222 | /* Provides the jit-reader-unload command. */ | |
223 | ||
224 | static void | |
225 | jit_reader_unload_command (char *args, int from_tty) | |
226 | { | |
227 | if (!loaded_jit_reader) | |
228 | error (_("No JIT reader loaded.")); | |
229 | ||
230 | loaded_jit_reader->functions->destroy (loaded_jit_reader->functions); | |
231 | ||
232 | gdb_dlclose (loaded_jit_reader->handle); | |
233 | xfree (loaded_jit_reader); | |
234 | loaded_jit_reader = NULL; | |
235 | } | |
236 | ||
03bef283 TT |
237 | /* Per-inferior structure recording which objfile has the JIT |
238 | symbols. */ | |
03673fc7 PP |
239 | |
240 | struct jit_inferior_data | |
241 | { | |
03bef283 TT |
242 | /* The objfile. This is NULL if no objfile holds the JIT |
243 | symbols. */ | |
244 | ||
245 | struct objfile *objfile; | |
f25c0135 TT |
246 | |
247 | /* If this inferior has __jit_debug_register_code, this is the | |
248 | cached address from the minimal symbol. This is used to detect | |
249 | relocations requiring the breakpoint to be re-created. */ | |
250 | ||
251 | CORE_ADDR cached_code_address; | |
252 | ||
253 | /* This is the JIT event breakpoint, or NULL if it has not been | |
254 | set. */ | |
255 | ||
256 | struct breakpoint *jit_breakpoint; | |
03bef283 TT |
257 | }; |
258 | ||
f25c0135 TT |
259 | /* Per-objfile structure recording the addresses in the inferior. |
260 | This object serves two purposes: for ordinary objfiles, it may | |
261 | cache some symbols related to the JIT interface; and for | |
262 | JIT-created objfiles, it holds some information about the | |
263 | jit_code_entry. */ | |
03bef283 TT |
264 | |
265 | struct jit_objfile_data | |
266 | { | |
267 | /* Symbol for __jit_debug_register_code. */ | |
268 | struct minimal_symbol *register_code; | |
269 | ||
270 | /* Symbol for __jit_debug_descriptor. */ | |
271 | struct minimal_symbol *descriptor; | |
272 | ||
f25c0135 TT |
273 | /* Address of struct jit_code_entry in this objfile. This is only |
274 | non-zero for objfiles that represent code created by the JIT. */ | |
03bef283 | 275 | CORE_ADDR addr; |
03673fc7 PP |
276 | }; |
277 | ||
03bef283 TT |
278 | /* Fetch the jit_objfile_data associated with OBJF. If no data exists |
279 | yet, make a new structure and attach it. */ | |
280 | ||
281 | static struct jit_objfile_data * | |
282 | get_jit_objfile_data (struct objfile *objf) | |
283 | { | |
284 | struct jit_objfile_data *objf_data; | |
285 | ||
286 | objf_data = objfile_data (objf, jit_objfile_data); | |
287 | if (objf_data == NULL) | |
288 | { | |
289 | objf_data = XZALLOC (struct jit_objfile_data); | |
290 | set_objfile_data (objf, jit_objfile_data, objf_data); | |
291 | } | |
292 | ||
293 | return objf_data; | |
294 | } | |
295 | ||
b4264740 SD |
296 | /* Remember OBJFILE has been created for struct jit_code_entry located |
297 | at inferior address ENTRY. */ | |
1825a88d SD |
298 | |
299 | static void | |
300 | add_objfile_entry (struct objfile *objfile, CORE_ADDR entry) | |
301 | { | |
03bef283 | 302 | struct jit_objfile_data *objf_data; |
1825a88d | 303 | |
03bef283 TT |
304 | objf_data = get_jit_objfile_data (objfile); |
305 | objf_data->addr = entry; | |
1825a88d SD |
306 | } |
307 | ||
03673fc7 PP |
308 | /* Return jit_inferior_data for current inferior. Allocate if not already |
309 | present. */ | |
310 | ||
311 | static struct jit_inferior_data * | |
312 | get_jit_inferior_data (void) | |
313 | { | |
314 | struct inferior *inf; | |
315 | struct jit_inferior_data *inf_data; | |
316 | ||
317 | inf = current_inferior (); | |
318 | inf_data = inferior_data (inf, jit_inferior_data); | |
319 | if (inf_data == NULL) | |
320 | { | |
321 | inf_data = XZALLOC (struct jit_inferior_data); | |
322 | set_inferior_data (inf, jit_inferior_data, inf_data); | |
323 | } | |
324 | ||
325 | return inf_data; | |
326 | } | |
327 | ||
328 | static void | |
329 | jit_inferior_data_cleanup (struct inferior *inf, void *arg) | |
330 | { | |
331 | xfree (arg); | |
332 | } | |
333 | ||
1777feb0 | 334 | /* Helper function for reading the global JIT descriptor from remote |
03bef283 | 335 | memory. Returns 1 if all went well, 0 otherwise. */ |
4efc6507 | 336 | |
03bef283 | 337 | static int |
0756c555 | 338 | jit_read_descriptor (struct gdbarch *gdbarch, |
03673fc7 | 339 | struct jit_descriptor *descriptor, |
03bef283 | 340 | struct jit_inferior_data *inf_data) |
4efc6507 DE |
341 | { |
342 | int err; | |
343 | struct type *ptr_type; | |
344 | int ptr_size; | |
345 | int desc_size; | |
346 | gdb_byte *desc_buf; | |
0756c555 | 347 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
03bef283 TT |
348 | struct jit_objfile_data *objf_data; |
349 | ||
350 | if (inf_data->objfile == NULL) | |
351 | return 0; | |
352 | objf_data = get_jit_objfile_data (inf_data->objfile); | |
353 | if (objf_data->descriptor == NULL) | |
354 | return 0; | |
355 | ||
356 | if (jit_debug) | |
357 | fprintf_unfiltered (gdb_stdlog, | |
358 | "jit_read_descriptor, descriptor_addr = %s\n", | |
359 | paddress (gdbarch, SYMBOL_VALUE_ADDRESS (objf_data->descriptor))); | |
4efc6507 DE |
360 | |
361 | /* Figure out how big the descriptor is on the remote and how to read it. */ | |
0756c555 | 362 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
363 | ptr_size = TYPE_LENGTH (ptr_type); |
364 | desc_size = 8 + 2 * ptr_size; /* Two 32-bit ints and two pointers. */ | |
365 | desc_buf = alloca (desc_size); | |
366 | ||
367 | /* Read the descriptor. */ | |
03bef283 TT |
368 | err = target_read_memory (SYMBOL_VALUE_ADDRESS (objf_data->descriptor), |
369 | desc_buf, desc_size); | |
4efc6507 | 370 | if (err) |
03bef283 TT |
371 | { |
372 | printf_unfiltered (_("Unable to read JIT descriptor from " | |
373 | "remote memory\n")); | |
374 | return 0; | |
375 | } | |
4efc6507 DE |
376 | |
377 | /* Fix the endianness to match the host. */ | |
378 | descriptor->version = extract_unsigned_integer (&desc_buf[0], 4, byte_order); | |
379 | descriptor->action_flag = | |
380 | extract_unsigned_integer (&desc_buf[4], 4, byte_order); | |
381 | descriptor->relevant_entry = extract_typed_address (&desc_buf[8], ptr_type); | |
382 | descriptor->first_entry = | |
383 | extract_typed_address (&desc_buf[8 + ptr_size], ptr_type); | |
03bef283 TT |
384 | |
385 | return 1; | |
4efc6507 DE |
386 | } |
387 | ||
388 | /* Helper function for reading a JITed code entry from remote memory. */ | |
389 | ||
390 | static void | |
0756c555 DE |
391 | jit_read_code_entry (struct gdbarch *gdbarch, |
392 | CORE_ADDR code_addr, struct jit_code_entry *code_entry) | |
4efc6507 | 393 | { |
205c306f | 394 | int err, off; |
4efc6507 DE |
395 | struct type *ptr_type; |
396 | int ptr_size; | |
397 | int entry_size; | |
205c306f | 398 | int align_bytes; |
4efc6507 | 399 | gdb_byte *entry_buf; |
0756c555 | 400 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4efc6507 DE |
401 | |
402 | /* Figure out how big the entry is on the remote and how to read it. */ | |
0756c555 | 403 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 | 404 | ptr_size = TYPE_LENGTH (ptr_type); |
227ee7fc RH |
405 | |
406 | /* Figure out where the longlong value will be. */ | |
407 | align_bytes = gdbarch_long_long_align_bit (gdbarch) / 8; | |
408 | off = 3 * ptr_size; | |
409 | off = (off + (align_bytes - 1)) & ~(align_bytes - 1); | |
410 | ||
411 | entry_size = off + 8; /* Three pointers and one 64-bit int. */ | |
4efc6507 DE |
412 | entry_buf = alloca (entry_size); |
413 | ||
414 | /* Read the entry. */ | |
415 | err = target_read_memory (code_addr, entry_buf, entry_size); | |
416 | if (err) | |
417 | error (_("Unable to read JIT code entry from remote memory!")); | |
418 | ||
419 | /* Fix the endianness to match the host. */ | |
0756c555 | 420 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
421 | code_entry->next_entry = extract_typed_address (&entry_buf[0], ptr_type); |
422 | code_entry->prev_entry = | |
423 | extract_typed_address (&entry_buf[ptr_size], ptr_type); | |
424 | code_entry->symfile_addr = | |
425 | extract_typed_address (&entry_buf[2 * ptr_size], ptr_type); | |
426 | code_entry->symfile_size = | |
205c306f | 427 | extract_unsigned_integer (&entry_buf[off], 8, byte_order); |
4efc6507 DE |
428 | } |
429 | ||
1825a88d SD |
430 | /* Proxy object for building a block. */ |
431 | ||
432 | struct gdb_block | |
433 | { | |
434 | /* gdb_blocks are linked into a tree structure. Next points to the | |
435 | next node at the same depth as this block and parent to the | |
436 | parent gdb_block. */ | |
437 | struct gdb_block *next, *parent; | |
438 | ||
439 | /* Points to the "real" block that is being built out of this | |
440 | instance. This block will be added to a blockvector, which will | |
441 | then be added to a symtab. */ | |
442 | struct block *real_block; | |
443 | ||
444 | /* The first and last code address corresponding to this block. */ | |
445 | CORE_ADDR begin, end; | |
446 | ||
447 | /* The name of this block (if any). If this is non-NULL, the | |
448 | FUNCTION symbol symbol is set to this value. */ | |
449 | const char *name; | |
450 | }; | |
451 | ||
452 | /* Proxy object for building a symtab. */ | |
453 | ||
454 | struct gdb_symtab | |
455 | { | |
456 | /* The list of blocks in this symtab. These will eventually be | |
457 | converted to real blocks. */ | |
458 | struct gdb_block *blocks; | |
459 | ||
460 | /* The number of blocks inserted. */ | |
461 | int nblocks; | |
462 | ||
463 | /* A mapping between line numbers to PC. */ | |
464 | struct linetable *linetable; | |
465 | ||
466 | /* The source file for this symtab. */ | |
467 | const char *file_name; | |
468 | struct gdb_symtab *next; | |
469 | }; | |
470 | ||
471 | /* Proxy object for building an object. */ | |
472 | ||
473 | struct gdb_object | |
474 | { | |
475 | struct gdb_symtab *symtabs; | |
476 | }; | |
477 | ||
478 | /* The type of the `private' data passed around by the callback | |
479 | functions. */ | |
480 | ||
481 | typedef CORE_ADDR jit_dbg_reader_data; | |
482 | ||
483 | /* The reader calls into this function to read data off the targets | |
484 | address space. */ | |
485 | ||
486 | static enum gdb_status | |
487 | jit_target_read_impl (GDB_CORE_ADDR target_mem, void *gdb_buf, int len) | |
488 | { | |
489 | int result = target_read_memory ((CORE_ADDR) target_mem, gdb_buf, len); | |
490 | if (result == 0) | |
491 | return GDB_SUCCESS; | |
492 | else | |
493 | return GDB_FAIL; | |
494 | } | |
495 | ||
496 | /* The reader calls into this function to create a new gdb_object | |
497 | which it can then pass around to the other callbacks. Right now, | |
498 | all that is required is allocating the memory. */ | |
499 | ||
500 | static struct gdb_object * | |
501 | jit_object_open_impl (struct gdb_symbol_callbacks *cb) | |
502 | { | |
503 | /* CB is not required right now, but sometime in the future we might | |
504 | need a handle to it, and we'd like to do that without breaking | |
505 | the ABI. */ | |
506 | return XZALLOC (struct gdb_object); | |
507 | } | |
508 | ||
509 | /* Readers call into this function to open a new gdb_symtab, which, | |
510 | again, is passed around to other callbacks. */ | |
511 | ||
512 | static struct gdb_symtab * | |
513 | jit_symtab_open_impl (struct gdb_symbol_callbacks *cb, | |
514 | struct gdb_object *object, | |
515 | const char *file_name) | |
516 | { | |
517 | struct gdb_symtab *ret; | |
518 | ||
519 | /* CB stays unused. See comment in jit_object_open_impl. */ | |
520 | ||
521 | ret = XZALLOC (struct gdb_symtab); | |
522 | ret->file_name = file_name ? xstrdup (file_name) : xstrdup (""); | |
523 | ret->next = object->symtabs; | |
524 | object->symtabs = ret; | |
525 | return ret; | |
526 | } | |
527 | ||
528 | /* Returns true if the block corresponding to old should be placed | |
529 | before the block corresponding to new in the final blockvector. */ | |
530 | ||
531 | static int | |
532 | compare_block (const struct gdb_block *const old, | |
533 | const struct gdb_block *const new) | |
534 | { | |
535 | if (old == NULL) | |
536 | return 1; | |
537 | if (old->begin < new->begin) | |
538 | return 1; | |
539 | else if (old->begin == new->begin) | |
540 | { | |
541 | if (old->end > new->end) | |
542 | return 1; | |
543 | else | |
544 | return 0; | |
545 | } | |
546 | else | |
547 | return 0; | |
548 | } | |
549 | ||
550 | /* Called by readers to open a new gdb_block. This function also | |
551 | inserts the new gdb_block in the correct place in the corresponding | |
552 | gdb_symtab. */ | |
553 | ||
554 | static struct gdb_block * | |
555 | jit_block_open_impl (struct gdb_symbol_callbacks *cb, | |
556 | struct gdb_symtab *symtab, struct gdb_block *parent, | |
557 | GDB_CORE_ADDR begin, GDB_CORE_ADDR end, const char *name) | |
558 | { | |
559 | struct gdb_block *block = XZALLOC (struct gdb_block); | |
560 | ||
561 | block->next = symtab->blocks; | |
562 | block->begin = (CORE_ADDR) begin; | |
563 | block->end = (CORE_ADDR) end; | |
564 | block->name = name ? xstrdup (name) : NULL; | |
565 | block->parent = parent; | |
566 | ||
567 | /* Ensure that the blocks are inserted in the correct (reverse of | |
568 | the order expected by blockvector). */ | |
569 | if (compare_block (symtab->blocks, block)) | |
570 | { | |
571 | symtab->blocks = block; | |
572 | } | |
573 | else | |
574 | { | |
575 | struct gdb_block *i = symtab->blocks; | |
576 | ||
577 | for (;; i = i->next) | |
578 | { | |
579 | /* Guaranteed to terminate, since compare_block (NULL, _) | |
580 | returns 1. */ | |
581 | if (compare_block (i->next, block)) | |
582 | { | |
583 | block->next = i->next; | |
584 | i->next = block; | |
585 | break; | |
586 | } | |
587 | } | |
588 | } | |
589 | symtab->nblocks++; | |
590 | ||
591 | return block; | |
592 | } | |
593 | ||
594 | /* Readers call this to add a line mapping (from PC to line number) to | |
595 | a gdb_symtab. */ | |
4efc6507 DE |
596 | |
597 | static void | |
1825a88d SD |
598 | jit_symtab_line_mapping_add_impl (struct gdb_symbol_callbacks *cb, |
599 | struct gdb_symtab *stab, int nlines, | |
600 | struct gdb_line_mapping *map) | |
601 | { | |
602 | int i; | |
603 | ||
604 | if (nlines < 1) | |
605 | return; | |
606 | ||
607 | stab->linetable = xmalloc (sizeof (struct linetable) | |
608 | + (nlines - 1) * sizeof (struct linetable_entry)); | |
609 | stab->linetable->nitems = nlines; | |
610 | for (i = 0; i < nlines; i++) | |
611 | { | |
612 | stab->linetable->item[i].pc = (CORE_ADDR) map[i].pc; | |
613 | stab->linetable->item[i].line = map[i].line; | |
614 | } | |
615 | } | |
616 | ||
617 | /* Called by readers to close a gdb_symtab. Does not need to do | |
618 | anything as of now. */ | |
619 | ||
620 | static void | |
621 | jit_symtab_close_impl (struct gdb_symbol_callbacks *cb, | |
622 | struct gdb_symtab *stab) | |
623 | { | |
624 | /* Right now nothing needs to be done here. We may need to do some | |
625 | cleanup here in the future (again, without breaking the plugin | |
626 | ABI). */ | |
627 | } | |
628 | ||
629 | /* Transform STAB to a proper symtab, and add it it OBJFILE. */ | |
630 | ||
631 | static void | |
632 | finalize_symtab (struct gdb_symtab *stab, struct objfile *objfile) | |
633 | { | |
634 | struct symtab *symtab; | |
635 | struct gdb_block *gdb_block_iter, *gdb_block_iter_tmp; | |
636 | struct block *block_iter; | |
637 | int actual_nblocks, i, blockvector_size; | |
638 | CORE_ADDR begin, end; | |
639 | ||
640 | actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks; | |
641 | ||
642 | symtab = allocate_symtab (stab->file_name, objfile); | |
643 | /* JIT compilers compile in memory. */ | |
644 | symtab->dirname = NULL; | |
645 | ||
646 | /* Copy over the linetable entry if one was provided. */ | |
647 | if (stab->linetable) | |
648 | { | |
649 | int size = ((stab->linetable->nitems - 1) | |
650 | * sizeof (struct linetable_entry) | |
651 | + sizeof (struct linetable)); | |
652 | LINETABLE (symtab) = obstack_alloc (&objfile->objfile_obstack, size); | |
653 | memcpy (LINETABLE (symtab), stab->linetable, size); | |
654 | } | |
655 | else | |
656 | { | |
657 | LINETABLE (symtab) = NULL; | |
658 | } | |
659 | ||
660 | blockvector_size = (sizeof (struct blockvector) | |
661 | + (actual_nblocks - 1) * sizeof (struct block *)); | |
662 | symtab->blockvector = obstack_alloc (&objfile->objfile_obstack, | |
663 | blockvector_size); | |
664 | ||
665 | /* (begin, end) will contain the PC range this entire blockvector | |
666 | spans. */ | |
667 | symtab->primary = 1; | |
668 | BLOCKVECTOR_MAP (symtab->blockvector) = NULL; | |
669 | begin = stab->blocks->begin; | |
670 | end = stab->blocks->end; | |
671 | BLOCKVECTOR_NBLOCKS (symtab->blockvector) = actual_nblocks; | |
672 | ||
673 | /* First run over all the gdb_block objects, creating a real block | |
674 | object for each. Simultaneously, keep setting the real_block | |
675 | fields. */ | |
676 | for (i = (actual_nblocks - 1), gdb_block_iter = stab->blocks; | |
677 | i >= FIRST_LOCAL_BLOCK; | |
678 | i--, gdb_block_iter = gdb_block_iter->next) | |
679 | { | |
680 | struct block *new_block = allocate_block (&objfile->objfile_obstack); | |
681 | struct symbol *block_name = obstack_alloc (&objfile->objfile_obstack, | |
682 | sizeof (struct symbol)); | |
2535757a TT |
683 | struct type *block_type = arch_type (get_objfile_arch (objfile), |
684 | TYPE_CODE_VOID, | |
685 | 1, | |
686 | "void"); | |
1825a88d SD |
687 | |
688 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, | |
689 | NULL); | |
690 | /* The address range. */ | |
691 | BLOCK_START (new_block) = (CORE_ADDR) gdb_block_iter->begin; | |
692 | BLOCK_END (new_block) = (CORE_ADDR) gdb_block_iter->end; | |
693 | ||
694 | /* The name. */ | |
695 | memset (block_name, 0, sizeof (struct symbol)); | |
696 | SYMBOL_DOMAIN (block_name) = VAR_DOMAIN; | |
697 | SYMBOL_CLASS (block_name) = LOC_BLOCK; | |
698 | SYMBOL_SYMTAB (block_name) = symtab; | |
2535757a | 699 | SYMBOL_TYPE (block_name) = lookup_function_type (block_type); |
1825a88d SD |
700 | SYMBOL_BLOCK_VALUE (block_name) = new_block; |
701 | ||
10f0c4bb TT |
702 | block_name->ginfo.name = obstack_copy0 (&objfile->objfile_obstack, |
703 | gdb_block_iter->name, | |
704 | strlen (gdb_block_iter->name)); | |
1825a88d SD |
705 | |
706 | BLOCK_FUNCTION (new_block) = block_name; | |
707 | ||
708 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
709 | if (begin > BLOCK_START (new_block)) | |
710 | begin = BLOCK_START (new_block); | |
711 | if (end < BLOCK_END (new_block)) | |
712 | end = BLOCK_END (new_block); | |
713 | ||
714 | gdb_block_iter->real_block = new_block; | |
715 | } | |
716 | ||
717 | /* Now add the special blocks. */ | |
718 | block_iter = NULL; | |
719 | for (i = 0; i < FIRST_LOCAL_BLOCK; i++) | |
720 | { | |
84a146c9 TT |
721 | struct block *new_block; |
722 | ||
723 | new_block = (i == GLOBAL_BLOCK | |
724 | ? allocate_global_block (&objfile->objfile_obstack) | |
725 | : allocate_block (&objfile->objfile_obstack)); | |
1825a88d SD |
726 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, |
727 | NULL); | |
728 | BLOCK_SUPERBLOCK (new_block) = block_iter; | |
729 | block_iter = new_block; | |
730 | ||
731 | BLOCK_START (new_block) = (CORE_ADDR) begin; | |
732 | BLOCK_END (new_block) = (CORE_ADDR) end; | |
733 | ||
734 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
84a146c9 TT |
735 | |
736 | if (i == GLOBAL_BLOCK) | |
737 | set_block_symtab (new_block, symtab); | |
1825a88d SD |
738 | } |
739 | ||
740 | /* Fill up the superblock fields for the real blocks, using the | |
741 | real_block fields populated earlier. */ | |
742 | for (gdb_block_iter = stab->blocks; | |
743 | gdb_block_iter; | |
744 | gdb_block_iter = gdb_block_iter->next) | |
745 | { | |
746 | if (gdb_block_iter->parent != NULL) | |
db334a01 SD |
747 | { |
748 | /* If the plugin specifically mentioned a parent block, we | |
749 | use that. */ | |
750 | BLOCK_SUPERBLOCK (gdb_block_iter->real_block) = | |
751 | gdb_block_iter->parent->real_block; | |
752 | } | |
753 | else | |
754 | { | |
755 | /* And if not, we set a default parent block. */ | |
756 | BLOCK_SUPERBLOCK (gdb_block_iter->real_block) = | |
757 | BLOCKVECTOR_BLOCK (symtab->blockvector, STATIC_BLOCK); | |
758 | } | |
1825a88d SD |
759 | } |
760 | ||
761 | /* Free memory. */ | |
762 | gdb_block_iter = stab->blocks; | |
763 | ||
764 | for (gdb_block_iter = stab->blocks, gdb_block_iter_tmp = gdb_block_iter->next; | |
765 | gdb_block_iter; | |
766 | gdb_block_iter = gdb_block_iter_tmp) | |
767 | { | |
768 | xfree ((void *) gdb_block_iter->name); | |
769 | xfree (gdb_block_iter); | |
770 | } | |
771 | xfree (stab->linetable); | |
772 | xfree ((char *) stab->file_name); | |
773 | xfree (stab); | |
774 | } | |
775 | ||
776 | /* Called when closing a gdb_objfile. Converts OBJ to a proper | |
777 | objfile. */ | |
778 | ||
779 | static void | |
780 | jit_object_close_impl (struct gdb_symbol_callbacks *cb, | |
781 | struct gdb_object *obj) | |
782 | { | |
783 | struct gdb_symtab *i, *j; | |
784 | struct objfile *objfile; | |
785 | jit_dbg_reader_data *priv_data; | |
786 | ||
787 | priv_data = cb->priv_data; | |
788 | ||
789 | objfile = allocate_objfile (NULL, 0); | |
f5656ead | 790 | objfile->gdbarch = target_gdbarch (); |
1825a88d | 791 | |
a5bd37c3 | 792 | terminate_minimal_symbol_table (objfile); |
1825a88d | 793 | |
e1507e95 | 794 | objfile->name = "<< JIT compiled code >>"; |
1825a88d SD |
795 | |
796 | j = NULL; | |
797 | for (i = obj->symtabs; i; i = j) | |
798 | { | |
799 | j = i->next; | |
800 | finalize_symtab (i, objfile); | |
801 | } | |
802 | add_objfile_entry (objfile, *priv_data); | |
803 | xfree (obj); | |
804 | } | |
805 | ||
744ab88c | 806 | /* Try to read CODE_ENTRY using the loaded jit reader (if any). |
b4264740 SD |
807 | ENTRY_ADDR is the address of the struct jit_code_entry in the |
808 | inferior address space. */ | |
1825a88d SD |
809 | |
810 | static int | |
744ab88c SD |
811 | jit_reader_try_read_symtab (struct jit_code_entry *code_entry, |
812 | CORE_ADDR entry_addr) | |
1825a88d SD |
813 | { |
814 | void *gdb_mem; | |
815 | int status; | |
1825a88d SD |
816 | jit_dbg_reader_data priv_data; |
817 | struct gdb_reader_funcs *funcs; | |
818 | volatile struct gdb_exception e; | |
819 | struct gdb_symbol_callbacks callbacks = | |
820 | { | |
821 | jit_object_open_impl, | |
822 | jit_symtab_open_impl, | |
823 | jit_block_open_impl, | |
824 | jit_symtab_close_impl, | |
825 | jit_object_close_impl, | |
826 | ||
827 | jit_symtab_line_mapping_add_impl, | |
828 | jit_target_read_impl, | |
829 | ||
830 | &priv_data | |
831 | }; | |
832 | ||
744ab88c | 833 | priv_data = entry_addr; |
1825a88d SD |
834 | |
835 | if (!loaded_jit_reader) | |
836 | return 0; | |
837 | ||
838 | gdb_mem = xmalloc (code_entry->symfile_size); | |
839 | ||
840 | status = 1; | |
841 | TRY_CATCH (e, RETURN_MASK_ALL) | |
842 | if (target_read_memory (code_entry->symfile_addr, gdb_mem, | |
843 | code_entry->symfile_size)) | |
844 | status = 0; | |
845 | if (e.reason < 0) | |
846 | status = 0; | |
847 | ||
848 | if (status) | |
849 | { | |
850 | funcs = loaded_jit_reader->functions; | |
851 | if (funcs->read (funcs, &callbacks, gdb_mem, code_entry->symfile_size) | |
852 | != GDB_SUCCESS) | |
853 | status = 0; | |
854 | } | |
855 | ||
856 | xfree (gdb_mem); | |
857 | if (jit_debug && status == 0) | |
858 | fprintf_unfiltered (gdb_stdlog, | |
859 | "Could not read symtab using the loaded JIT reader.\n"); | |
860 | return status; | |
861 | } | |
862 | ||
744ab88c | 863 | /* Try to read CODE_ENTRY using BFD. ENTRY_ADDR is the address of the |
b4264740 | 864 | struct jit_code_entry in the inferior address space. */ |
1825a88d SD |
865 | |
866 | static void | |
867 | jit_bfd_try_read_symtab (struct jit_code_entry *code_entry, | |
744ab88c | 868 | CORE_ADDR entry_addr, |
1825a88d | 869 | struct gdbarch *gdbarch) |
4efc6507 DE |
870 | { |
871 | bfd *nbfd; | |
872 | struct section_addr_info *sai; | |
873 | struct bfd_section *sec; | |
874 | struct objfile *objfile; | |
4dfb2365 | 875 | struct cleanup *old_cleanups; |
4efc6507 DE |
876 | int i; |
877 | const struct bfd_arch_info *b; | |
4efc6507 | 878 | |
a255712f PP |
879 | if (jit_debug) |
880 | fprintf_unfiltered (gdb_stdlog, | |
881 | "jit_register_code, symfile_addr = %s, " | |
882 | "symfile_size = %s\n", | |
883 | paddress (gdbarch, code_entry->symfile_addr), | |
884 | pulongest (code_entry->symfile_size)); | |
885 | ||
4efc6507 DE |
886 | nbfd = bfd_open_from_target_memory (code_entry->symfile_addr, |
887 | code_entry->symfile_size, gnutarget); | |
4dfb2365 JK |
888 | if (nbfd == NULL) |
889 | { | |
890 | puts_unfiltered (_("Error opening JITed symbol file, ignoring it.\n")); | |
891 | return; | |
892 | } | |
4efc6507 DE |
893 | |
894 | /* Check the format. NOTE: This initializes important data that GDB uses! | |
895 | We would segfault later without this line. */ | |
896 | if (!bfd_check_format (nbfd, bfd_object)) | |
897 | { | |
898 | printf_unfiltered (_("\ | |
899 | JITed symbol file is not an object file, ignoring it.\n")); | |
cbb099e8 | 900 | gdb_bfd_unref (nbfd); |
4efc6507 DE |
901 | return; |
902 | } | |
903 | ||
904 | /* Check bfd arch. */ | |
0756c555 | 905 | b = gdbarch_bfd_arch_info (gdbarch); |
4efc6507 DE |
906 | if (b->compatible (b, bfd_get_arch_info (nbfd)) != b) |
907 | warning (_("JITed object file architecture %s is not compatible " | |
908 | "with target architecture %s."), bfd_get_arch_info | |
909 | (nbfd)->printable_name, b->printable_name); | |
910 | ||
911 | /* Read the section address information out of the symbol file. Since the | |
912 | file is generated by the JIT at runtime, it should all of the absolute | |
913 | addresses that we care about. */ | |
914 | sai = alloc_section_addr_info (bfd_count_sections (nbfd)); | |
4dfb2365 | 915 | old_cleanups = make_cleanup_free_section_addr_info (sai); |
4efc6507 DE |
916 | i = 0; |
917 | for (sec = nbfd->sections; sec != NULL; sec = sec->next) | |
918 | if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0) | |
919 | { | |
920 | /* We assume that these virtual addresses are absolute, and do not | |
921 | treat them as offsets. */ | |
922 | sai->other[i].addr = bfd_get_section_vma (nbfd, sec); | |
04a679b8 | 923 | sai->other[i].name = xstrdup (bfd_get_section_name (nbfd, sec)); |
4efc6507 DE |
924 | sai->other[i].sectindex = sec->index; |
925 | ++i; | |
926 | } | |
927 | ||
8ac244b4 TT |
928 | /* This call does not take ownership of SAI. */ |
929 | make_cleanup_bfd_unref (nbfd); | |
63524580 | 930 | objfile = symbol_file_add_from_bfd (nbfd, 0, sai, OBJF_SHARED, NULL); |
4efc6507 | 931 | |
4dfb2365 | 932 | do_cleanups (old_cleanups); |
744ab88c | 933 | add_objfile_entry (objfile, entry_addr); |
1825a88d SD |
934 | } |
935 | ||
936 | /* This function registers code associated with a JIT code entry. It uses the | |
937 | pointer and size pair in the entry to read the symbol file from the remote | |
938 | and then calls symbol_file_add_from_local_memory to add it as though it were | |
939 | a symbol file added by the user. */ | |
940 | ||
941 | static void | |
942 | jit_register_code (struct gdbarch *gdbarch, | |
943 | CORE_ADDR entry_addr, struct jit_code_entry *code_entry) | |
944 | { | |
974a734b | 945 | int success; |
1825a88d SD |
946 | |
947 | if (jit_debug) | |
948 | fprintf_unfiltered (gdb_stdlog, | |
949 | "jit_register_code, symfile_addr = %s, " | |
950 | "symfile_size = %s\n", | |
951 | paddress (gdbarch, code_entry->symfile_addr), | |
952 | pulongest (code_entry->symfile_size)); | |
953 | ||
744ab88c | 954 | success = jit_reader_try_read_symtab (code_entry, entry_addr); |
1825a88d SD |
955 | |
956 | if (!success) | |
744ab88c | 957 | jit_bfd_try_read_symtab (code_entry, entry_addr, gdbarch); |
4efc6507 DE |
958 | } |
959 | ||
1777feb0 MS |
960 | /* This function unregisters JITed code and frees the corresponding |
961 | objfile. */ | |
4efc6507 DE |
962 | |
963 | static void | |
964 | jit_unregister_code (struct objfile *objfile) | |
965 | { | |
966 | free_objfile (objfile); | |
967 | } | |
968 | ||
969 | /* Look up the objfile with this code entry address. */ | |
970 | ||
971 | static struct objfile * | |
972 | jit_find_objf_with_entry_addr (CORE_ADDR entry_addr) | |
973 | { | |
974 | struct objfile *objf; | |
4efc6507 DE |
975 | |
976 | ALL_OBJFILES (objf) | |
977 | { | |
03bef283 TT |
978 | struct jit_objfile_data *objf_data; |
979 | ||
980 | objf_data = objfile_data (objf, jit_objfile_data); | |
981 | if (objf_data != NULL && objf_data->addr == entry_addr) | |
4efc6507 DE |
982 | return objf; |
983 | } | |
984 | return NULL; | |
985 | } | |
986 | ||
f25c0135 TT |
987 | /* A callback for iterate_over_inferiors that updates the inferior's |
988 | JIT breakpoint information, if necessary. */ | |
989 | ||
990 | static int | |
991 | jit_update_inferior_cache (struct inferior *inf, void *data) | |
992 | { | |
993 | struct bp_location *loc = data; | |
994 | ||
995 | if (inf->pspace == loc->pspace) | |
996 | { | |
997 | struct jit_inferior_data *inf_data; | |
998 | ||
999 | inf_data = inferior_data (inf, jit_inferior_data); | |
1000 | if (inf_data != NULL && inf_data->jit_breakpoint == loc->owner) | |
1001 | { | |
1002 | inf_data->cached_code_address = 0; | |
1003 | inf_data->jit_breakpoint = NULL; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | /* This is called when a breakpoint is deleted. It updates the | |
1011 | inferior's cache, if needed. */ | |
1012 | ||
1013 | static void | |
1014 | jit_breakpoint_deleted (struct breakpoint *b) | |
1015 | { | |
1016 | struct bp_location *iter; | |
1017 | ||
1018 | if (b->type != bp_jit_event) | |
1019 | return; | |
1020 | ||
1021 | for (iter = b->loc; iter != NULL; iter = iter->next) | |
1022 | iterate_over_inferiors (jit_update_inferior_cache, iter); | |
1023 | } | |
1024 | ||
03673fc7 PP |
1025 | /* (Re-)Initialize the jit breakpoint if necessary. |
1026 | Return 0 on success. */ | |
1027 | ||
1028 | static int | |
1029 | jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, | |
1030 | struct jit_inferior_data *inf_data) | |
1031 | { | |
03bef283 TT |
1032 | struct minimal_symbol *reg_symbol, *desc_symbol; |
1033 | struct objfile *objf; | |
1034 | struct jit_objfile_data *objf_data; | |
f25c0135 | 1035 | CORE_ADDR addr; |
03bef283 | 1036 | |
f25c0135 TT |
1037 | if (inf_data->objfile == NULL) |
1038 | { | |
1039 | /* Lookup the registration symbol. If it is missing, then we | |
1040 | assume we are not attached to a JIT. */ | |
1041 | reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name, &objf); | |
1042 | if (reg_symbol == NULL || SYMBOL_VALUE_ADDRESS (reg_symbol) == 0) | |
1043 | return 1; | |
03bef283 | 1044 | |
f25c0135 TT |
1045 | desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, objf); |
1046 | if (desc_symbol == NULL || SYMBOL_VALUE_ADDRESS (desc_symbol) == 0) | |
1047 | return 1; | |
03bef283 | 1048 | |
f25c0135 TT |
1049 | objf_data = get_jit_objfile_data (objf); |
1050 | objf_data->register_code = reg_symbol; | |
1051 | objf_data->descriptor = desc_symbol; | |
03bef283 | 1052 | |
f25c0135 TT |
1053 | inf_data->objfile = objf; |
1054 | } | |
1055 | else | |
1056 | objf_data = get_jit_objfile_data (inf_data->objfile); | |
03bef283 | 1057 | |
f25c0135 | 1058 | addr = SYMBOL_VALUE_ADDRESS (objf_data->register_code); |
03bef283 | 1059 | |
03673fc7 PP |
1060 | if (jit_debug) |
1061 | fprintf_unfiltered (gdb_stdlog, | |
1062 | "jit_breakpoint_re_set_internal, " | |
1063 | "breakpoint_addr = %s\n", | |
f25c0135 TT |
1064 | paddress (gdbarch, addr)); |
1065 | ||
1066 | if (inf_data->cached_code_address == addr) | |
1067 | return 1; | |
1068 | ||
1069 | /* Delete the old breakpoint. */ | |
1070 | if (inf_data->jit_breakpoint != NULL) | |
1071 | delete_breakpoint (inf_data->jit_breakpoint); | |
03673fc7 PP |
1072 | |
1073 | /* Put a breakpoint in the registration symbol. */ | |
f25c0135 TT |
1074 | inf_data->cached_code_address = addr; |
1075 | inf_data->jit_breakpoint = create_jit_event_breakpoint (gdbarch, addr); | |
03673fc7 PP |
1076 | |
1077 | return 0; | |
1078 | } | |
1079 | ||
3623dc3a SD |
1080 | /* The private data passed around in the frame unwind callback |
1081 | functions. */ | |
1082 | ||
1083 | struct jit_unwind_private | |
1084 | { | |
1085 | /* Cached register values. See jit_frame_sniffer to see how this | |
1086 | works. */ | |
1087 | struct gdb_reg_value **registers; | |
1088 | ||
1089 | /* The frame being unwound. */ | |
1090 | struct frame_info *this_frame; | |
1091 | }; | |
1092 | ||
1093 | /* Sets the value of a particular register in this frame. */ | |
1094 | ||
1095 | static void | |
1096 | jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum, | |
1097 | struct gdb_reg_value *value) | |
1098 | { | |
1099 | struct jit_unwind_private *priv; | |
1100 | int gdb_reg; | |
1101 | ||
1102 | priv = cb->priv_data; | |
1103 | ||
1104 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame), | |
1105 | dwarf_regnum); | |
1106 | if (gdb_reg == -1) | |
1107 | { | |
1108 | if (jit_debug) | |
1109 | fprintf_unfiltered (gdb_stdlog, | |
1110 | _("Could not recognize DWARF regnum %d"), | |
1111 | dwarf_regnum); | |
1112 | return; | |
1113 | } | |
1114 | ||
1115 | gdb_assert (priv->registers); | |
1116 | priv->registers[gdb_reg] = value; | |
1117 | } | |
1118 | ||
1119 | static void | |
1120 | reg_value_free_impl (struct gdb_reg_value *value) | |
1121 | { | |
1122 | xfree (value); | |
1123 | } | |
1124 | ||
1125 | /* Get the value of register REGNUM in the previous frame. */ | |
1126 | ||
1127 | static struct gdb_reg_value * | |
1128 | jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum) | |
1129 | { | |
1130 | struct jit_unwind_private *priv; | |
1131 | struct gdb_reg_value *value; | |
1132 | int gdb_reg, size; | |
1133 | struct gdbarch *frame_arch; | |
1134 | ||
1135 | priv = cb->priv_data; | |
1136 | frame_arch = get_frame_arch (priv->this_frame); | |
1137 | ||
1138 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum); | |
1139 | size = register_size (frame_arch, gdb_reg); | |
1140 | value = xmalloc (sizeof (struct gdb_reg_value) + size - 1); | |
ca9d61b9 JB |
1141 | value->defined = deprecated_frame_register_read (priv->this_frame, gdb_reg, |
1142 | value->value); | |
3623dc3a SD |
1143 | value->size = size; |
1144 | value->free = reg_value_free_impl; | |
1145 | return value; | |
1146 | } | |
1147 | ||
1148 | /* gdb_reg_value has a free function, which must be called on each | |
1149 | saved register value. */ | |
1150 | ||
1151 | static void | |
1152 | jit_dealloc_cache (struct frame_info *this_frame, void *cache) | |
1153 | { | |
1154 | struct jit_unwind_private *priv_data = cache; | |
1155 | struct gdbarch *frame_arch; | |
1156 | int i; | |
1157 | ||
1158 | gdb_assert (priv_data->registers); | |
1159 | frame_arch = get_frame_arch (priv_data->this_frame); | |
1160 | ||
1161 | for (i = 0; i < gdbarch_num_regs (frame_arch); i++) | |
1162 | if (priv_data->registers[i] && priv_data->registers[i]->free) | |
1163 | priv_data->registers[i]->free (priv_data->registers[i]); | |
1164 | ||
1165 | xfree (priv_data->registers); | |
1166 | xfree (priv_data); | |
1167 | } | |
1168 | ||
1169 | /* The frame sniffer for the pseudo unwinder. | |
1170 | ||
1171 | While this is nominally a frame sniffer, in the case where the JIT | |
1172 | reader actually recognizes the frame, it does a lot more work -- it | |
1173 | unwinds the frame and saves the corresponding register values in | |
1174 | the cache. jit_frame_prev_register simply returns the saved | |
1175 | register values. */ | |
1176 | ||
1177 | static int | |
1178 | jit_frame_sniffer (const struct frame_unwind *self, | |
1179 | struct frame_info *this_frame, void **cache) | |
1180 | { | |
3623dc3a | 1181 | struct jit_unwind_private *priv_data; |
3623dc3a SD |
1182 | struct gdb_unwind_callbacks callbacks; |
1183 | struct gdb_reader_funcs *funcs; | |
1184 | ||
3623dc3a SD |
1185 | callbacks.reg_get = jit_unwind_reg_get_impl; |
1186 | callbacks.reg_set = jit_unwind_reg_set_impl; | |
1187 | callbacks.target_read = jit_target_read_impl; | |
1188 | ||
1189 | if (loaded_jit_reader == NULL) | |
1190 | return 0; | |
1191 | ||
1192 | funcs = loaded_jit_reader->functions; | |
1193 | ||
1194 | gdb_assert (!*cache); | |
1195 | ||
1196 | *cache = XZALLOC (struct jit_unwind_private); | |
1197 | priv_data = *cache; | |
1198 | priv_data->registers = | |
1199 | XCALLOC (gdbarch_num_regs (get_frame_arch (this_frame)), | |
1200 | struct gdb_reg_value *); | |
1201 | priv_data->this_frame = this_frame; | |
1202 | ||
1203 | callbacks.priv_data = priv_data; | |
1204 | ||
1205 | /* Try to coax the provided unwinder to unwind the stack */ | |
1206 | if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS) | |
1207 | { | |
1208 | if (jit_debug) | |
1209 | fprintf_unfiltered (gdb_stdlog, _("Successfully unwound frame using " | |
1210 | "JIT reader.\n")); | |
1211 | return 1; | |
1212 | } | |
1213 | if (jit_debug) | |
1214 | fprintf_unfiltered (gdb_stdlog, _("Could not unwind frame using " | |
1215 | "JIT reader.\n")); | |
1216 | ||
1217 | jit_dealloc_cache (this_frame, *cache); | |
1218 | *cache = NULL; | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | ||
1224 | /* The frame_id function for the pseudo unwinder. Relays the call to | |
1225 | the loaded plugin. */ | |
1226 | ||
1227 | static void | |
1228 | jit_frame_this_id (struct frame_info *this_frame, void **cache, | |
1229 | struct frame_id *this_id) | |
1230 | { | |
1231 | struct jit_unwind_private private; | |
1232 | struct gdb_frame_id frame_id; | |
1233 | struct gdb_reader_funcs *funcs; | |
1234 | struct gdb_unwind_callbacks callbacks; | |
1235 | ||
1236 | private.registers = NULL; | |
1237 | private.this_frame = this_frame; | |
1238 | ||
1239 | /* We don't expect the frame_id function to set any registers, so we | |
1240 | set reg_set to NULL. */ | |
1241 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1242 | callbacks.reg_set = NULL; | |
1243 | callbacks.target_read = jit_target_read_impl; | |
1244 | callbacks.priv_data = &private; | |
1245 | ||
1246 | gdb_assert (loaded_jit_reader); | |
1247 | funcs = loaded_jit_reader->functions; | |
1248 | ||
1249 | frame_id = funcs->get_frame_id (funcs, &callbacks); | |
1250 | *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address); | |
1251 | } | |
1252 | ||
1253 | /* Pseudo unwinder function. Reads the previously fetched value for | |
1254 | the register from the cache. */ | |
1255 | ||
1256 | static struct value * | |
1257 | jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg) | |
1258 | { | |
1259 | struct jit_unwind_private *priv = *cache; | |
1260 | struct gdb_reg_value *value; | |
1261 | ||
1262 | if (priv == NULL) | |
1263 | return frame_unwind_got_optimized (this_frame, reg); | |
1264 | ||
1265 | gdb_assert (priv->registers); | |
1266 | value = priv->registers[reg]; | |
1267 | if (value && value->defined) | |
1268 | return frame_unwind_got_bytes (this_frame, reg, value->value); | |
1269 | else | |
1270 | return frame_unwind_got_optimized (this_frame, reg); | |
1271 | } | |
1272 | ||
1273 | /* Relay everything back to the unwinder registered by the JIT debug | |
1274 | info reader.*/ | |
1275 | ||
1276 | static const struct frame_unwind jit_frame_unwind = | |
1277 | { | |
1278 | NORMAL_FRAME, | |
1279 | default_frame_unwind_stop_reason, | |
1280 | jit_frame_this_id, | |
1281 | jit_frame_prev_register, | |
1282 | NULL, | |
1283 | jit_frame_sniffer, | |
1284 | jit_dealloc_cache | |
1285 | }; | |
1286 | ||
1287 | ||
1288 | /* This is the information that is stored at jit_gdbarch_data for each | |
1289 | architecture. */ | |
1290 | ||
1291 | struct jit_gdbarch_data_type | |
1292 | { | |
1293 | /* Has the (pseudo) unwinder been prepended? */ | |
1294 | int unwinder_registered; | |
1295 | }; | |
1296 | ||
1297 | /* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */ | |
1298 | ||
1299 | static void | |
1300 | jit_prepend_unwinder (struct gdbarch *gdbarch) | |
1301 | { | |
1302 | struct jit_gdbarch_data_type *data; | |
1303 | ||
1304 | data = gdbarch_data (gdbarch, jit_gdbarch_data); | |
1305 | if (!data->unwinder_registered) | |
1306 | { | |
1307 | frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind); | |
1308 | data->unwinder_registered = 1; | |
1309 | } | |
1310 | } | |
1311 | ||
03673fc7 | 1312 | /* Register any already created translations. */ |
0756c555 DE |
1313 | |
1314 | static void | |
1315 | jit_inferior_init (struct gdbarch *gdbarch) | |
4efc6507 | 1316 | { |
4efc6507 DE |
1317 | struct jit_descriptor descriptor; |
1318 | struct jit_code_entry cur_entry; | |
03673fc7 | 1319 | struct jit_inferior_data *inf_data; |
4efc6507 | 1320 | CORE_ADDR cur_entry_addr; |
4efc6507 | 1321 | |
a255712f | 1322 | if (jit_debug) |
03673fc7 | 1323 | fprintf_unfiltered (gdb_stdlog, "jit_inferior_init\n"); |
a255712f | 1324 | |
3623dc3a SD |
1325 | jit_prepend_unwinder (gdbarch); |
1326 | ||
03673fc7 PP |
1327 | inf_data = get_jit_inferior_data (); |
1328 | if (jit_breakpoint_re_set_internal (gdbarch, inf_data) != 0) | |
4efc6507 DE |
1329 | return; |
1330 | ||
1777feb0 MS |
1331 | /* Read the descriptor so we can check the version number and load |
1332 | any already JITed functions. */ | |
03bef283 TT |
1333 | if (!jit_read_descriptor (gdbarch, &descriptor, inf_data)) |
1334 | return; | |
4efc6507 DE |
1335 | |
1336 | /* Check that the version number agrees with that we support. */ | |
1337 | if (descriptor.version != 1) | |
03bef283 TT |
1338 | { |
1339 | printf_unfiltered (_("Unsupported JIT protocol version %ld " | |
1340 | "in descriptor (expected 1)\n"), | |
1341 | (long) descriptor.version); | |
1342 | return; | |
1343 | } | |
4efc6507 | 1344 | |
1777feb0 MS |
1345 | /* If we've attached to a running program, we need to check the descriptor |
1346 | to register any functions that were already generated. */ | |
4efc6507 DE |
1347 | for (cur_entry_addr = descriptor.first_entry; |
1348 | cur_entry_addr != 0; | |
1349 | cur_entry_addr = cur_entry.next_entry) | |
1350 | { | |
0756c555 | 1351 | jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1352 | |
1353 | /* This hook may be called many times during setup, so make sure we don't | |
1354 | add the same symbol file twice. */ | |
1355 | if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL) | |
1356 | continue; | |
1357 | ||
0756c555 | 1358 | jit_register_code (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1359 | } |
1360 | } | |
1361 | ||
0756c555 DE |
1362 | /* Exported routine to call when an inferior has been created. */ |
1363 | ||
1364 | void | |
1365 | jit_inferior_created_hook (void) | |
1366 | { | |
f5656ead | 1367 | jit_inferior_init (target_gdbarch ()); |
0756c555 DE |
1368 | } |
1369 | ||
1370 | /* Exported routine to call to re-set the jit breakpoints, | |
1371 | e.g. when a program is rerun. */ | |
1372 | ||
1373 | void | |
1374 | jit_breakpoint_re_set (void) | |
1375 | { | |
f5656ead | 1376 | jit_breakpoint_re_set_internal (target_gdbarch (), |
03673fc7 PP |
1377 | get_jit_inferior_data ()); |
1378 | } | |
1379 | ||
1777feb0 MS |
1380 | /* This function cleans up any code entries left over when the |
1381 | inferior exits. We get left over code when the inferior exits | |
1382 | without unregistering its code, for example when it crashes. */ | |
4efc6507 DE |
1383 | |
1384 | static void | |
a79b8f6e | 1385 | jit_inferior_exit_hook (struct inferior *inf) |
4efc6507 DE |
1386 | { |
1387 | struct objfile *objf; | |
1388 | struct objfile *temp; | |
1389 | ||
4efc6507 | 1390 | ALL_OBJFILES_SAFE (objf, temp) |
03bef283 TT |
1391 | { |
1392 | struct jit_objfile_data *objf_data = objfile_data (objf, | |
1393 | jit_objfile_data); | |
4efc6507 | 1394 | |
03bef283 TT |
1395 | if (objf_data != NULL && objf_data->addr != 0) |
1396 | jit_unregister_code (objf); | |
1397 | } | |
03673fc7 PP |
1398 | } |
1399 | ||
4efc6507 | 1400 | void |
0756c555 | 1401 | jit_event_handler (struct gdbarch *gdbarch) |
4efc6507 DE |
1402 | { |
1403 | struct jit_descriptor descriptor; | |
1404 | struct jit_code_entry code_entry; | |
1405 | CORE_ADDR entry_addr; | |
1406 | struct objfile *objf; | |
1407 | ||
1408 | /* Read the descriptor from remote memory. */ | |
03bef283 TT |
1409 | if (!jit_read_descriptor (gdbarch, &descriptor, get_jit_inferior_data ())) |
1410 | return; | |
4efc6507 DE |
1411 | entry_addr = descriptor.relevant_entry; |
1412 | ||
1777feb0 | 1413 | /* Do the corresponding action. */ |
4efc6507 DE |
1414 | switch (descriptor.action_flag) |
1415 | { | |
1416 | case JIT_NOACTION: | |
1417 | break; | |
1418 | case JIT_REGISTER: | |
0756c555 DE |
1419 | jit_read_code_entry (gdbarch, entry_addr, &code_entry); |
1420 | jit_register_code (gdbarch, entry_addr, &code_entry); | |
4efc6507 DE |
1421 | break; |
1422 | case JIT_UNREGISTER: | |
1423 | objf = jit_find_objf_with_entry_addr (entry_addr); | |
1424 | if (objf == NULL) | |
1777feb0 MS |
1425 | printf_unfiltered (_("Unable to find JITed code " |
1426 | "entry at address: %s\n"), | |
dfdbc9b4 | 1427 | paddress (gdbarch, entry_addr)); |
4efc6507 DE |
1428 | else |
1429 | jit_unregister_code (objf); | |
1430 | ||
1431 | break; | |
1432 | default: | |
1433 | error (_("Unknown action_flag value in JIT descriptor!")); | |
1434 | break; | |
1435 | } | |
1436 | } | |
1437 | ||
1825a88d SD |
1438 | /* Called to free the data allocated to the jit_inferior_data slot. */ |
1439 | ||
1440 | static void | |
1441 | free_objfile_data (struct objfile *objfile, void *data) | |
1442 | { | |
03bef283 TT |
1443 | struct jit_objfile_data *objf_data = data; |
1444 | ||
1445 | if (objf_data->register_code != NULL) | |
1446 | { | |
1447 | struct jit_inferior_data *inf_data = get_jit_inferior_data (); | |
1448 | ||
1449 | if (inf_data->objfile == objfile) | |
1450 | inf_data->objfile = NULL; | |
1451 | } | |
1452 | ||
1825a88d SD |
1453 | xfree (data); |
1454 | } | |
1455 | ||
3623dc3a SD |
1456 | /* Initialize the jit_gdbarch_data slot with an instance of struct |
1457 | jit_gdbarch_data_type */ | |
1458 | ||
1459 | static void * | |
1460 | jit_gdbarch_data_init (struct obstack *obstack) | |
1461 | { | |
1462 | struct jit_gdbarch_data_type *data; | |
1463 | ||
1464 | data = obstack_alloc (obstack, sizeof (struct jit_gdbarch_data_type)); | |
1465 | data->unwinder_registered = 0; | |
1466 | return data; | |
1467 | } | |
1468 | ||
4efc6507 DE |
1469 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1470 | ||
1471 | extern void _initialize_jit (void); | |
1472 | ||
1473 | void | |
1474 | _initialize_jit (void) | |
1475 | { | |
b8e0a31c SD |
1476 | jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR, |
1477 | JIT_READER_DIR_RELOCATABLE); | |
ccce17b0 YQ |
1478 | add_setshow_zuinteger_cmd ("jit", class_maintenance, &jit_debug, |
1479 | _("Set JIT debugging."), | |
1480 | _("Show JIT debugging."), | |
1481 | _("When non-zero, JIT debugging is enabled."), | |
1482 | NULL, | |
1483 | show_jit_debug, | |
1484 | &setdebuglist, &showdebuglist); | |
a255712f | 1485 | |
4efc6507 | 1486 | observer_attach_inferior_exit (jit_inferior_exit_hook); |
f25c0135 TT |
1487 | observer_attach_breakpoint_deleted (jit_breakpoint_deleted); |
1488 | ||
1825a88d SD |
1489 | jit_objfile_data = |
1490 | register_objfile_data_with_cleanup (NULL, free_objfile_data); | |
03673fc7 | 1491 | jit_inferior_data = |
8e260fc0 | 1492 | register_inferior_data_with_cleanup (NULL, jit_inferior_data_cleanup); |
3623dc3a | 1493 | jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init); |
784c47ee SD |
1494 | if (is_dl_available ()) |
1495 | { | |
1496 | add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\ | |
1497 | Load FILE as debug info reader and unwinder for JIT compiled code.\n\ | |
1498 | Usage: jit-reader-load FILE\n\ | |
1499 | Try to load file FILE as a debug info reader (and unwinder) for\n\ | |
1500 | JIT compiled code. The file is loaded from " JIT_READER_DIR ",\n\ | |
1501 | relocated relative to the GDB executable if required.")); | |
1502 | add_com ("jit-reader-unload", no_class, jit_reader_unload_command, _("\ | |
1503 | Unload the currently loaded JIT debug info reader.\n\ | |
1504 | Usage: jit-reader-unload FILE\n\n\ | |
1505 | Do \"help jit-reader-load\" for info on loading debug info readers.")); | |
1506 | } | |
4efc6507 | 1507 | } |