Commit | Line | Data |
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4efc6507 DE |
1 | /* Handle JIT code generation in the inferior for GDB, the GNU Debugger. |
2 | ||
0b302171 | 3 | Copyright (C) 2009-2012 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 SD |
27 | #include "dictionary.h" |
28 | #include "frame-unwind.h" | |
a255712f | 29 | #include "gdbcmd.h" |
4efc6507 | 30 | #include "gdbcore.h" |
03673fc7 | 31 | #include "inferior.h" |
4efc6507 DE |
32 | #include "observer.h" |
33 | #include "objfiles.h" | |
3623dc3a | 34 | #include "regcache.h" |
4efc6507 DE |
35 | #include "symfile.h" |
36 | #include "symtab.h" | |
37 | #include "target.h" | |
784c47ee | 38 | #include "gdb-dlfcn.h" |
4efc6507 | 39 | #include "gdb_stat.h" |
1825a88d | 40 | #include "exceptions.h" |
4efc6507 | 41 | |
b8e0a31c SD |
42 | static const char *jit_reader_dir = NULL; |
43 | ||
4efc6507 DE |
44 | static const struct objfile_data *jit_objfile_data; |
45 | ||
46 | static const char *const jit_break_name = "__jit_debug_register_code"; | |
47 | ||
48 | static const char *const jit_descriptor_name = "__jit_debug_descriptor"; | |
49 | ||
03673fc7 | 50 | static const struct inferior_data *jit_inferior_data = NULL; |
4efc6507 | 51 | |
e2bd3b15 | 52 | static void jit_inferior_init (struct gdbarch *gdbarch); |
3b2a0cf2 | 53 | |
3623dc3a SD |
54 | /* An unwinder is registered for every gdbarch. This key is used to |
55 | remember if the unwinder has been registered for a particular | |
56 | gdbarch. */ | |
57 | ||
58 | static struct gdbarch_data *jit_gdbarch_data; | |
59 | ||
a255712f PP |
60 | /* Non-zero if we want to see trace of jit level stuff. */ |
61 | ||
62 | static int jit_debug = 0; | |
63 | ||
64 | static void | |
65 | show_jit_debug (struct ui_file *file, int from_tty, | |
66 | struct cmd_list_element *c, const char *value) | |
67 | { | |
68 | fprintf_filtered (file, _("JIT debugging is %s.\n"), value); | |
69 | } | |
70 | ||
4efc6507 DE |
71 | struct target_buffer |
72 | { | |
73 | CORE_ADDR base; | |
a255712f | 74 | ULONGEST size; |
4efc6507 DE |
75 | }; |
76 | ||
77 | /* Openning the file is a no-op. */ | |
78 | ||
79 | static void * | |
80 | mem_bfd_iovec_open (struct bfd *abfd, void *open_closure) | |
81 | { | |
82 | return open_closure; | |
83 | } | |
84 | ||
85 | /* Closing the file is just freeing the base/size pair on our side. */ | |
86 | ||
87 | static int | |
88 | mem_bfd_iovec_close (struct bfd *abfd, void *stream) | |
89 | { | |
90 | xfree (stream); | |
91 | return 1; | |
92 | } | |
93 | ||
94 | /* For reading the file, we just need to pass through to target_read_memory and | |
95 | fix up the arguments and return values. */ | |
96 | ||
97 | static file_ptr | |
98 | mem_bfd_iovec_pread (struct bfd *abfd, void *stream, void *buf, | |
99 | file_ptr nbytes, file_ptr offset) | |
100 | { | |
101 | int err; | |
102 | struct target_buffer *buffer = (struct target_buffer *) stream; | |
103 | ||
104 | /* If this read will read all of the file, limit it to just the rest. */ | |
105 | if (offset + nbytes > buffer->size) | |
106 | nbytes = buffer->size - offset; | |
107 | ||
108 | /* If there are no more bytes left, we've reached EOF. */ | |
109 | if (nbytes == 0) | |
110 | return 0; | |
111 | ||
112 | err = target_read_memory (buffer->base + offset, (gdb_byte *) buf, nbytes); | |
113 | if (err) | |
114 | return -1; | |
115 | ||
116 | return nbytes; | |
117 | } | |
118 | ||
119 | /* For statting the file, we only support the st_size attribute. */ | |
120 | ||
121 | static int | |
122 | mem_bfd_iovec_stat (struct bfd *abfd, void *stream, struct stat *sb) | |
123 | { | |
124 | struct target_buffer *buffer = (struct target_buffer*) stream; | |
125 | ||
126 | sb->st_size = buffer->size; | |
127 | return 0; | |
128 | } | |
129 | ||
f0bbc364 TT |
130 | /* Open a BFD from the target's memory. */ |
131 | ||
132 | static struct bfd * | |
133 | bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size, char *target) | |
134 | { | |
135 | const char *filename = xstrdup ("<in-memory>"); | |
136 | struct target_buffer *buffer = xmalloc (sizeof (struct target_buffer)); | |
137 | ||
138 | buffer->base = addr; | |
139 | buffer->size = size; | |
140 | return bfd_openr_iovec (filename, target, | |
141 | mem_bfd_iovec_open, | |
142 | buffer, | |
143 | mem_bfd_iovec_pread, | |
144 | mem_bfd_iovec_close, | |
145 | mem_bfd_iovec_stat); | |
146 | } | |
147 | ||
784c47ee SD |
148 | /* One reader that has been loaded successfully, and can potentially be used to |
149 | parse debug info. */ | |
150 | ||
151 | static struct jit_reader | |
152 | { | |
153 | struct gdb_reader_funcs *functions; | |
154 | void *handle; | |
155 | } *loaded_jit_reader = NULL; | |
156 | ||
157 | typedef struct gdb_reader_funcs * (reader_init_fn_type) (void); | |
158 | static const char *reader_init_fn_sym = "gdb_init_reader"; | |
159 | ||
160 | /* Try to load FILE_NAME as a JIT debug info reader. */ | |
161 | ||
162 | static struct jit_reader * | |
163 | jit_reader_load (const char *file_name) | |
164 | { | |
165 | void *so; | |
166 | reader_init_fn_type *init_fn; | |
167 | struct jit_reader *new_reader = NULL; | |
168 | struct gdb_reader_funcs *funcs = NULL; | |
169 | struct cleanup *old_cleanups; | |
170 | ||
171 | if (jit_debug) | |
172 | fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"), | |
173 | file_name); | |
174 | so = gdb_dlopen (file_name); | |
175 | old_cleanups = make_cleanup_dlclose (so); | |
176 | ||
177 | init_fn = gdb_dlsym (so, reader_init_fn_sym); | |
178 | if (!init_fn) | |
179 | error (_("Could not locate initialization function: %s."), | |
180 | reader_init_fn_sym); | |
181 | ||
182 | if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL) | |
183 | error (_("Reader not GPL compatible.")); | |
184 | ||
185 | funcs = init_fn (); | |
186 | if (funcs->reader_version != GDB_READER_INTERFACE_VERSION) | |
187 | error (_("Reader version does not match GDB version.")); | |
188 | ||
189 | new_reader = XZALLOC (struct jit_reader); | |
190 | new_reader->functions = funcs; | |
191 | new_reader->handle = so; | |
192 | ||
193 | discard_cleanups (old_cleanups); | |
194 | return new_reader; | |
195 | } | |
196 | ||
197 | /* Provides the jit-reader-load command. */ | |
198 | ||
199 | static void | |
200 | jit_reader_load_command (char *args, int from_tty) | |
201 | { | |
202 | char *so_name; | |
203 | int len; | |
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 | ||
212 | so_name = xstrprintf ("%s/%s", jit_reader_dir, args); | |
213 | prev_cleanup = make_cleanup (xfree, so_name); | |
214 | ||
215 | loaded_jit_reader = jit_reader_load (so_name); | |
216 | do_cleanups (prev_cleanup); | |
217 | } | |
218 | ||
219 | /* Provides the jit-reader-unload command. */ | |
220 | ||
221 | static void | |
222 | jit_reader_unload_command (char *args, int from_tty) | |
223 | { | |
224 | if (!loaded_jit_reader) | |
225 | error (_("No JIT reader loaded.")); | |
226 | ||
227 | loaded_jit_reader->functions->destroy (loaded_jit_reader->functions); | |
228 | ||
229 | gdb_dlclose (loaded_jit_reader->handle); | |
230 | xfree (loaded_jit_reader); | |
231 | loaded_jit_reader = NULL; | |
232 | } | |
233 | ||
03bef283 TT |
234 | /* Per-inferior structure recording which objfile has the JIT |
235 | symbols. */ | |
03673fc7 PP |
236 | |
237 | struct jit_inferior_data | |
238 | { | |
03bef283 TT |
239 | /* The objfile. This is NULL if no objfile holds the JIT |
240 | symbols. */ | |
241 | ||
242 | struct objfile *objfile; | |
243 | }; | |
244 | ||
245 | /* Per-objfile structure recording the addresses in the inferior. */ | |
246 | ||
247 | struct jit_objfile_data | |
248 | { | |
249 | /* Symbol for __jit_debug_register_code. */ | |
250 | struct minimal_symbol *register_code; | |
251 | ||
252 | /* Symbol for __jit_debug_descriptor. */ | |
253 | struct minimal_symbol *descriptor; | |
254 | ||
255 | /* Address of struct jit_code_entry in this objfile. */ | |
256 | CORE_ADDR addr; | |
03673fc7 PP |
257 | }; |
258 | ||
03bef283 TT |
259 | /* Fetch the jit_objfile_data associated with OBJF. If no data exists |
260 | yet, make a new structure and attach it. */ | |
261 | ||
262 | static struct jit_objfile_data * | |
263 | get_jit_objfile_data (struct objfile *objf) | |
264 | { | |
265 | struct jit_objfile_data *objf_data; | |
266 | ||
267 | objf_data = objfile_data (objf, jit_objfile_data); | |
268 | if (objf_data == NULL) | |
269 | { | |
270 | objf_data = XZALLOC (struct jit_objfile_data); | |
271 | set_objfile_data (objf, jit_objfile_data, objf_data); | |
272 | } | |
273 | ||
274 | return objf_data; | |
275 | } | |
276 | ||
b4264740 SD |
277 | /* Remember OBJFILE has been created for struct jit_code_entry located |
278 | at inferior address ENTRY. */ | |
1825a88d SD |
279 | |
280 | static void | |
281 | add_objfile_entry (struct objfile *objfile, CORE_ADDR entry) | |
282 | { | |
283 | CORE_ADDR *entry_addr_ptr; | |
03bef283 | 284 | struct jit_objfile_data *objf_data; |
1825a88d | 285 | |
03bef283 TT |
286 | objf_data = get_jit_objfile_data (objfile); |
287 | objf_data->addr = entry; | |
1825a88d SD |
288 | } |
289 | ||
03673fc7 PP |
290 | /* Return jit_inferior_data for current inferior. Allocate if not already |
291 | present. */ | |
292 | ||
293 | static struct jit_inferior_data * | |
294 | get_jit_inferior_data (void) | |
295 | { | |
296 | struct inferior *inf; | |
297 | struct jit_inferior_data *inf_data; | |
298 | ||
299 | inf = current_inferior (); | |
300 | inf_data = inferior_data (inf, jit_inferior_data); | |
301 | if (inf_data == NULL) | |
302 | { | |
303 | inf_data = XZALLOC (struct jit_inferior_data); | |
304 | set_inferior_data (inf, jit_inferior_data, inf_data); | |
305 | } | |
306 | ||
307 | return inf_data; | |
308 | } | |
309 | ||
310 | static void | |
311 | jit_inferior_data_cleanup (struct inferior *inf, void *arg) | |
312 | { | |
313 | xfree (arg); | |
314 | } | |
315 | ||
1777feb0 | 316 | /* Helper function for reading the global JIT descriptor from remote |
03bef283 | 317 | memory. Returns 1 if all went well, 0 otherwise. */ |
4efc6507 | 318 | |
03bef283 | 319 | static int |
0756c555 | 320 | jit_read_descriptor (struct gdbarch *gdbarch, |
03673fc7 | 321 | struct jit_descriptor *descriptor, |
03bef283 | 322 | struct jit_inferior_data *inf_data) |
4efc6507 DE |
323 | { |
324 | int err; | |
325 | struct type *ptr_type; | |
326 | int ptr_size; | |
327 | int desc_size; | |
328 | gdb_byte *desc_buf; | |
0756c555 | 329 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
03bef283 TT |
330 | struct jit_objfile_data *objf_data; |
331 | ||
332 | if (inf_data->objfile == NULL) | |
333 | return 0; | |
334 | objf_data = get_jit_objfile_data (inf_data->objfile); | |
335 | if (objf_data->descriptor == NULL) | |
336 | return 0; | |
337 | ||
338 | if (jit_debug) | |
339 | fprintf_unfiltered (gdb_stdlog, | |
340 | "jit_read_descriptor, descriptor_addr = %s\n", | |
341 | paddress (gdbarch, SYMBOL_VALUE_ADDRESS (objf_data->descriptor))); | |
4efc6507 DE |
342 | |
343 | /* Figure out how big the descriptor is on the remote and how to read it. */ | |
0756c555 | 344 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
345 | ptr_size = TYPE_LENGTH (ptr_type); |
346 | desc_size = 8 + 2 * ptr_size; /* Two 32-bit ints and two pointers. */ | |
347 | desc_buf = alloca (desc_size); | |
348 | ||
349 | /* Read the descriptor. */ | |
03bef283 TT |
350 | err = target_read_memory (SYMBOL_VALUE_ADDRESS (objf_data->descriptor), |
351 | desc_buf, desc_size); | |
4efc6507 | 352 | if (err) |
03bef283 TT |
353 | { |
354 | printf_unfiltered (_("Unable to read JIT descriptor from " | |
355 | "remote memory\n")); | |
356 | return 0; | |
357 | } | |
4efc6507 DE |
358 | |
359 | /* Fix the endianness to match the host. */ | |
360 | descriptor->version = extract_unsigned_integer (&desc_buf[0], 4, byte_order); | |
361 | descriptor->action_flag = | |
362 | extract_unsigned_integer (&desc_buf[4], 4, byte_order); | |
363 | descriptor->relevant_entry = extract_typed_address (&desc_buf[8], ptr_type); | |
364 | descriptor->first_entry = | |
365 | extract_typed_address (&desc_buf[8 + ptr_size], ptr_type); | |
03bef283 TT |
366 | |
367 | return 1; | |
4efc6507 DE |
368 | } |
369 | ||
370 | /* Helper function for reading a JITed code entry from remote memory. */ | |
371 | ||
372 | static void | |
0756c555 DE |
373 | jit_read_code_entry (struct gdbarch *gdbarch, |
374 | CORE_ADDR code_addr, struct jit_code_entry *code_entry) | |
4efc6507 | 375 | { |
205c306f | 376 | int err, off; |
4efc6507 DE |
377 | struct type *ptr_type; |
378 | int ptr_size; | |
379 | int entry_size; | |
205c306f | 380 | int align_bytes; |
4efc6507 | 381 | gdb_byte *entry_buf; |
0756c555 | 382 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4efc6507 DE |
383 | |
384 | /* Figure out how big the entry is on the remote and how to read it. */ | |
0756c555 | 385 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 | 386 | ptr_size = TYPE_LENGTH (ptr_type); |
227ee7fc RH |
387 | |
388 | /* Figure out where the longlong value will be. */ | |
389 | align_bytes = gdbarch_long_long_align_bit (gdbarch) / 8; | |
390 | off = 3 * ptr_size; | |
391 | off = (off + (align_bytes - 1)) & ~(align_bytes - 1); | |
392 | ||
393 | entry_size = off + 8; /* Three pointers and one 64-bit int. */ | |
4efc6507 DE |
394 | entry_buf = alloca (entry_size); |
395 | ||
396 | /* Read the entry. */ | |
397 | err = target_read_memory (code_addr, entry_buf, entry_size); | |
398 | if (err) | |
399 | error (_("Unable to read JIT code entry from remote memory!")); | |
400 | ||
401 | /* Fix the endianness to match the host. */ | |
0756c555 | 402 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
403 | code_entry->next_entry = extract_typed_address (&entry_buf[0], ptr_type); |
404 | code_entry->prev_entry = | |
405 | extract_typed_address (&entry_buf[ptr_size], ptr_type); | |
406 | code_entry->symfile_addr = | |
407 | extract_typed_address (&entry_buf[2 * ptr_size], ptr_type); | |
408 | code_entry->symfile_size = | |
205c306f | 409 | extract_unsigned_integer (&entry_buf[off], 8, byte_order); |
4efc6507 DE |
410 | } |
411 | ||
1825a88d SD |
412 | /* Proxy object for building a block. */ |
413 | ||
414 | struct gdb_block | |
415 | { | |
416 | /* gdb_blocks are linked into a tree structure. Next points to the | |
417 | next node at the same depth as this block and parent to the | |
418 | parent gdb_block. */ | |
419 | struct gdb_block *next, *parent; | |
420 | ||
421 | /* Points to the "real" block that is being built out of this | |
422 | instance. This block will be added to a blockvector, which will | |
423 | then be added to a symtab. */ | |
424 | struct block *real_block; | |
425 | ||
426 | /* The first and last code address corresponding to this block. */ | |
427 | CORE_ADDR begin, end; | |
428 | ||
429 | /* The name of this block (if any). If this is non-NULL, the | |
430 | FUNCTION symbol symbol is set to this value. */ | |
431 | const char *name; | |
432 | }; | |
433 | ||
434 | /* Proxy object for building a symtab. */ | |
435 | ||
436 | struct gdb_symtab | |
437 | { | |
438 | /* The list of blocks in this symtab. These will eventually be | |
439 | converted to real blocks. */ | |
440 | struct gdb_block *blocks; | |
441 | ||
442 | /* The number of blocks inserted. */ | |
443 | int nblocks; | |
444 | ||
445 | /* A mapping between line numbers to PC. */ | |
446 | struct linetable *linetable; | |
447 | ||
448 | /* The source file for this symtab. */ | |
449 | const char *file_name; | |
450 | struct gdb_symtab *next; | |
451 | }; | |
452 | ||
453 | /* Proxy object for building an object. */ | |
454 | ||
455 | struct gdb_object | |
456 | { | |
457 | struct gdb_symtab *symtabs; | |
458 | }; | |
459 | ||
460 | /* The type of the `private' data passed around by the callback | |
461 | functions. */ | |
462 | ||
463 | typedef CORE_ADDR jit_dbg_reader_data; | |
464 | ||
465 | /* The reader calls into this function to read data off the targets | |
466 | address space. */ | |
467 | ||
468 | static enum gdb_status | |
469 | jit_target_read_impl (GDB_CORE_ADDR target_mem, void *gdb_buf, int len) | |
470 | { | |
471 | int result = target_read_memory ((CORE_ADDR) target_mem, gdb_buf, len); | |
472 | if (result == 0) | |
473 | return GDB_SUCCESS; | |
474 | else | |
475 | return GDB_FAIL; | |
476 | } | |
477 | ||
478 | /* The reader calls into this function to create a new gdb_object | |
479 | which it can then pass around to the other callbacks. Right now, | |
480 | all that is required is allocating the memory. */ | |
481 | ||
482 | static struct gdb_object * | |
483 | jit_object_open_impl (struct gdb_symbol_callbacks *cb) | |
484 | { | |
485 | /* CB is not required right now, but sometime in the future we might | |
486 | need a handle to it, and we'd like to do that without breaking | |
487 | the ABI. */ | |
488 | return XZALLOC (struct gdb_object); | |
489 | } | |
490 | ||
491 | /* Readers call into this function to open a new gdb_symtab, which, | |
492 | again, is passed around to other callbacks. */ | |
493 | ||
494 | static struct gdb_symtab * | |
495 | jit_symtab_open_impl (struct gdb_symbol_callbacks *cb, | |
496 | struct gdb_object *object, | |
497 | const char *file_name) | |
498 | { | |
499 | struct gdb_symtab *ret; | |
500 | ||
501 | /* CB stays unused. See comment in jit_object_open_impl. */ | |
502 | ||
503 | ret = XZALLOC (struct gdb_symtab); | |
504 | ret->file_name = file_name ? xstrdup (file_name) : xstrdup (""); | |
505 | ret->next = object->symtabs; | |
506 | object->symtabs = ret; | |
507 | return ret; | |
508 | } | |
509 | ||
510 | /* Returns true if the block corresponding to old should be placed | |
511 | before the block corresponding to new in the final blockvector. */ | |
512 | ||
513 | static int | |
514 | compare_block (const struct gdb_block *const old, | |
515 | const struct gdb_block *const new) | |
516 | { | |
517 | if (old == NULL) | |
518 | return 1; | |
519 | if (old->begin < new->begin) | |
520 | return 1; | |
521 | else if (old->begin == new->begin) | |
522 | { | |
523 | if (old->end > new->end) | |
524 | return 1; | |
525 | else | |
526 | return 0; | |
527 | } | |
528 | else | |
529 | return 0; | |
530 | } | |
531 | ||
532 | /* Called by readers to open a new gdb_block. This function also | |
533 | inserts the new gdb_block in the correct place in the corresponding | |
534 | gdb_symtab. */ | |
535 | ||
536 | static struct gdb_block * | |
537 | jit_block_open_impl (struct gdb_symbol_callbacks *cb, | |
538 | struct gdb_symtab *symtab, struct gdb_block *parent, | |
539 | GDB_CORE_ADDR begin, GDB_CORE_ADDR end, const char *name) | |
540 | { | |
541 | struct gdb_block *block = XZALLOC (struct gdb_block); | |
542 | ||
543 | block->next = symtab->blocks; | |
544 | block->begin = (CORE_ADDR) begin; | |
545 | block->end = (CORE_ADDR) end; | |
546 | block->name = name ? xstrdup (name) : NULL; | |
547 | block->parent = parent; | |
548 | ||
549 | /* Ensure that the blocks are inserted in the correct (reverse of | |
550 | the order expected by blockvector). */ | |
551 | if (compare_block (symtab->blocks, block)) | |
552 | { | |
553 | symtab->blocks = block; | |
554 | } | |
555 | else | |
556 | { | |
557 | struct gdb_block *i = symtab->blocks; | |
558 | ||
559 | for (;; i = i->next) | |
560 | { | |
561 | /* Guaranteed to terminate, since compare_block (NULL, _) | |
562 | returns 1. */ | |
563 | if (compare_block (i->next, block)) | |
564 | { | |
565 | block->next = i->next; | |
566 | i->next = block; | |
567 | break; | |
568 | } | |
569 | } | |
570 | } | |
571 | symtab->nblocks++; | |
572 | ||
573 | return block; | |
574 | } | |
575 | ||
576 | /* Readers call this to add a line mapping (from PC to line number) to | |
577 | a gdb_symtab. */ | |
4efc6507 DE |
578 | |
579 | static void | |
1825a88d SD |
580 | jit_symtab_line_mapping_add_impl (struct gdb_symbol_callbacks *cb, |
581 | struct gdb_symtab *stab, int nlines, | |
582 | struct gdb_line_mapping *map) | |
583 | { | |
584 | int i; | |
585 | ||
586 | if (nlines < 1) | |
587 | return; | |
588 | ||
589 | stab->linetable = xmalloc (sizeof (struct linetable) | |
590 | + (nlines - 1) * sizeof (struct linetable_entry)); | |
591 | stab->linetable->nitems = nlines; | |
592 | for (i = 0; i < nlines; i++) | |
593 | { | |
594 | stab->linetable->item[i].pc = (CORE_ADDR) map[i].pc; | |
595 | stab->linetable->item[i].line = map[i].line; | |
596 | } | |
597 | } | |
598 | ||
599 | /* Called by readers to close a gdb_symtab. Does not need to do | |
600 | anything as of now. */ | |
601 | ||
602 | static void | |
603 | jit_symtab_close_impl (struct gdb_symbol_callbacks *cb, | |
604 | struct gdb_symtab *stab) | |
605 | { | |
606 | /* Right now nothing needs to be done here. We may need to do some | |
607 | cleanup here in the future (again, without breaking the plugin | |
608 | ABI). */ | |
609 | } | |
610 | ||
611 | /* Transform STAB to a proper symtab, and add it it OBJFILE. */ | |
612 | ||
613 | static void | |
614 | finalize_symtab (struct gdb_symtab *stab, struct objfile *objfile) | |
615 | { | |
616 | struct symtab *symtab; | |
617 | struct gdb_block *gdb_block_iter, *gdb_block_iter_tmp; | |
618 | struct block *block_iter; | |
619 | int actual_nblocks, i, blockvector_size; | |
620 | CORE_ADDR begin, end; | |
621 | ||
622 | actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks; | |
623 | ||
624 | symtab = allocate_symtab (stab->file_name, objfile); | |
625 | /* JIT compilers compile in memory. */ | |
626 | symtab->dirname = NULL; | |
627 | ||
628 | /* Copy over the linetable entry if one was provided. */ | |
629 | if (stab->linetable) | |
630 | { | |
631 | int size = ((stab->linetable->nitems - 1) | |
632 | * sizeof (struct linetable_entry) | |
633 | + sizeof (struct linetable)); | |
634 | LINETABLE (symtab) = obstack_alloc (&objfile->objfile_obstack, size); | |
635 | memcpy (LINETABLE (symtab), stab->linetable, size); | |
636 | } | |
637 | else | |
638 | { | |
639 | LINETABLE (symtab) = NULL; | |
640 | } | |
641 | ||
642 | blockvector_size = (sizeof (struct blockvector) | |
643 | + (actual_nblocks - 1) * sizeof (struct block *)); | |
644 | symtab->blockvector = obstack_alloc (&objfile->objfile_obstack, | |
645 | blockvector_size); | |
646 | ||
647 | /* (begin, end) will contain the PC range this entire blockvector | |
648 | spans. */ | |
649 | symtab->primary = 1; | |
650 | BLOCKVECTOR_MAP (symtab->blockvector) = NULL; | |
651 | begin = stab->blocks->begin; | |
652 | end = stab->blocks->end; | |
653 | BLOCKVECTOR_NBLOCKS (symtab->blockvector) = actual_nblocks; | |
654 | ||
655 | /* First run over all the gdb_block objects, creating a real block | |
656 | object for each. Simultaneously, keep setting the real_block | |
657 | fields. */ | |
658 | for (i = (actual_nblocks - 1), gdb_block_iter = stab->blocks; | |
659 | i >= FIRST_LOCAL_BLOCK; | |
660 | i--, gdb_block_iter = gdb_block_iter->next) | |
661 | { | |
662 | struct block *new_block = allocate_block (&objfile->objfile_obstack); | |
663 | struct symbol *block_name = obstack_alloc (&objfile->objfile_obstack, | |
664 | sizeof (struct symbol)); | |
665 | ||
666 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, | |
667 | NULL); | |
668 | /* The address range. */ | |
669 | BLOCK_START (new_block) = (CORE_ADDR) gdb_block_iter->begin; | |
670 | BLOCK_END (new_block) = (CORE_ADDR) gdb_block_iter->end; | |
671 | ||
672 | /* The name. */ | |
673 | memset (block_name, 0, sizeof (struct symbol)); | |
674 | SYMBOL_DOMAIN (block_name) = VAR_DOMAIN; | |
675 | SYMBOL_CLASS (block_name) = LOC_BLOCK; | |
676 | SYMBOL_SYMTAB (block_name) = symtab; | |
677 | SYMBOL_BLOCK_VALUE (block_name) = new_block; | |
678 | ||
679 | block_name->ginfo.name = obsavestring (gdb_block_iter->name, | |
680 | strlen (gdb_block_iter->name), | |
681 | &objfile->objfile_obstack); | |
682 | ||
683 | BLOCK_FUNCTION (new_block) = block_name; | |
684 | ||
685 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
686 | if (begin > BLOCK_START (new_block)) | |
687 | begin = BLOCK_START (new_block); | |
688 | if (end < BLOCK_END (new_block)) | |
689 | end = BLOCK_END (new_block); | |
690 | ||
691 | gdb_block_iter->real_block = new_block; | |
692 | } | |
693 | ||
694 | /* Now add the special blocks. */ | |
695 | block_iter = NULL; | |
696 | for (i = 0; i < FIRST_LOCAL_BLOCK; i++) | |
697 | { | |
84a146c9 TT |
698 | struct block *new_block; |
699 | ||
700 | new_block = (i == GLOBAL_BLOCK | |
701 | ? allocate_global_block (&objfile->objfile_obstack) | |
702 | : allocate_block (&objfile->objfile_obstack)); | |
1825a88d SD |
703 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, |
704 | NULL); | |
705 | BLOCK_SUPERBLOCK (new_block) = block_iter; | |
706 | block_iter = new_block; | |
707 | ||
708 | BLOCK_START (new_block) = (CORE_ADDR) begin; | |
709 | BLOCK_END (new_block) = (CORE_ADDR) end; | |
710 | ||
711 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
84a146c9 TT |
712 | |
713 | if (i == GLOBAL_BLOCK) | |
714 | set_block_symtab (new_block, symtab); | |
1825a88d SD |
715 | } |
716 | ||
717 | /* Fill up the superblock fields for the real blocks, using the | |
718 | real_block fields populated earlier. */ | |
719 | for (gdb_block_iter = stab->blocks; | |
720 | gdb_block_iter; | |
721 | gdb_block_iter = gdb_block_iter->next) | |
722 | { | |
723 | if (gdb_block_iter->parent != NULL) | |
724 | BLOCK_SUPERBLOCK (gdb_block_iter->real_block) = | |
725 | gdb_block_iter->parent->real_block; | |
726 | } | |
727 | ||
728 | /* Free memory. */ | |
729 | gdb_block_iter = stab->blocks; | |
730 | ||
731 | for (gdb_block_iter = stab->blocks, gdb_block_iter_tmp = gdb_block_iter->next; | |
732 | gdb_block_iter; | |
733 | gdb_block_iter = gdb_block_iter_tmp) | |
734 | { | |
735 | xfree ((void *) gdb_block_iter->name); | |
736 | xfree (gdb_block_iter); | |
737 | } | |
738 | xfree (stab->linetable); | |
739 | xfree ((char *) stab->file_name); | |
740 | xfree (stab); | |
741 | } | |
742 | ||
743 | /* Called when closing a gdb_objfile. Converts OBJ to a proper | |
744 | objfile. */ | |
745 | ||
746 | static void | |
747 | jit_object_close_impl (struct gdb_symbol_callbacks *cb, | |
748 | struct gdb_object *obj) | |
749 | { | |
750 | struct gdb_symtab *i, *j; | |
751 | struct objfile *objfile; | |
752 | jit_dbg_reader_data *priv_data; | |
753 | ||
754 | priv_data = cb->priv_data; | |
755 | ||
756 | objfile = allocate_objfile (NULL, 0); | |
757 | objfile->gdbarch = target_gdbarch; | |
758 | ||
a5bd37c3 | 759 | terminate_minimal_symbol_table (objfile); |
1825a88d SD |
760 | |
761 | xfree (objfile->name); | |
762 | objfile->name = xstrdup ("<< JIT compiled code >>"); | |
763 | ||
764 | j = NULL; | |
765 | for (i = obj->symtabs; i; i = j) | |
766 | { | |
767 | j = i->next; | |
768 | finalize_symtab (i, objfile); | |
769 | } | |
770 | add_objfile_entry (objfile, *priv_data); | |
771 | xfree (obj); | |
772 | } | |
773 | ||
744ab88c | 774 | /* Try to read CODE_ENTRY using the loaded jit reader (if any). |
b4264740 SD |
775 | ENTRY_ADDR is the address of the struct jit_code_entry in the |
776 | inferior address space. */ | |
1825a88d SD |
777 | |
778 | static int | |
744ab88c SD |
779 | jit_reader_try_read_symtab (struct jit_code_entry *code_entry, |
780 | CORE_ADDR entry_addr) | |
1825a88d SD |
781 | { |
782 | void *gdb_mem; | |
783 | int status; | |
784 | struct jit_dbg_reader *i; | |
785 | jit_dbg_reader_data priv_data; | |
786 | struct gdb_reader_funcs *funcs; | |
787 | volatile struct gdb_exception e; | |
788 | struct gdb_symbol_callbacks callbacks = | |
789 | { | |
790 | jit_object_open_impl, | |
791 | jit_symtab_open_impl, | |
792 | jit_block_open_impl, | |
793 | jit_symtab_close_impl, | |
794 | jit_object_close_impl, | |
795 | ||
796 | jit_symtab_line_mapping_add_impl, | |
797 | jit_target_read_impl, | |
798 | ||
799 | &priv_data | |
800 | }; | |
801 | ||
744ab88c | 802 | priv_data = entry_addr; |
1825a88d SD |
803 | |
804 | if (!loaded_jit_reader) | |
805 | return 0; | |
806 | ||
807 | gdb_mem = xmalloc (code_entry->symfile_size); | |
808 | ||
809 | status = 1; | |
810 | TRY_CATCH (e, RETURN_MASK_ALL) | |
811 | if (target_read_memory (code_entry->symfile_addr, gdb_mem, | |
812 | code_entry->symfile_size)) | |
813 | status = 0; | |
814 | if (e.reason < 0) | |
815 | status = 0; | |
816 | ||
817 | if (status) | |
818 | { | |
819 | funcs = loaded_jit_reader->functions; | |
820 | if (funcs->read (funcs, &callbacks, gdb_mem, code_entry->symfile_size) | |
821 | != GDB_SUCCESS) | |
822 | status = 0; | |
823 | } | |
824 | ||
825 | xfree (gdb_mem); | |
826 | if (jit_debug && status == 0) | |
827 | fprintf_unfiltered (gdb_stdlog, | |
828 | "Could not read symtab using the loaded JIT reader.\n"); | |
829 | return status; | |
830 | } | |
831 | ||
744ab88c | 832 | /* Try to read CODE_ENTRY using BFD. ENTRY_ADDR is the address of the |
b4264740 | 833 | struct jit_code_entry in the inferior address space. */ |
1825a88d SD |
834 | |
835 | static void | |
836 | jit_bfd_try_read_symtab (struct jit_code_entry *code_entry, | |
744ab88c | 837 | CORE_ADDR entry_addr, |
1825a88d | 838 | struct gdbarch *gdbarch) |
4efc6507 DE |
839 | { |
840 | bfd *nbfd; | |
841 | struct section_addr_info *sai; | |
842 | struct bfd_section *sec; | |
843 | struct objfile *objfile; | |
4dfb2365 | 844 | struct cleanup *old_cleanups; |
4efc6507 DE |
845 | int i; |
846 | const struct bfd_arch_info *b; | |
4efc6507 | 847 | |
a255712f PP |
848 | if (jit_debug) |
849 | fprintf_unfiltered (gdb_stdlog, | |
850 | "jit_register_code, symfile_addr = %s, " | |
851 | "symfile_size = %s\n", | |
852 | paddress (gdbarch, code_entry->symfile_addr), | |
853 | pulongest (code_entry->symfile_size)); | |
854 | ||
4efc6507 DE |
855 | nbfd = bfd_open_from_target_memory (code_entry->symfile_addr, |
856 | code_entry->symfile_size, gnutarget); | |
4dfb2365 JK |
857 | if (nbfd == NULL) |
858 | { | |
859 | puts_unfiltered (_("Error opening JITed symbol file, ignoring it.\n")); | |
860 | return; | |
861 | } | |
4efc6507 DE |
862 | |
863 | /* Check the format. NOTE: This initializes important data that GDB uses! | |
864 | We would segfault later without this line. */ | |
865 | if (!bfd_check_format (nbfd, bfd_object)) | |
866 | { | |
867 | printf_unfiltered (_("\ | |
868 | JITed symbol file is not an object file, ignoring it.\n")); | |
4dfb2365 | 869 | bfd_close (nbfd); |
4efc6507 DE |
870 | return; |
871 | } | |
872 | ||
873 | /* Check bfd arch. */ | |
0756c555 | 874 | b = gdbarch_bfd_arch_info (gdbarch); |
4efc6507 DE |
875 | if (b->compatible (b, bfd_get_arch_info (nbfd)) != b) |
876 | warning (_("JITed object file architecture %s is not compatible " | |
877 | "with target architecture %s."), bfd_get_arch_info | |
878 | (nbfd)->printable_name, b->printable_name); | |
879 | ||
880 | /* Read the section address information out of the symbol file. Since the | |
881 | file is generated by the JIT at runtime, it should all of the absolute | |
882 | addresses that we care about. */ | |
883 | sai = alloc_section_addr_info (bfd_count_sections (nbfd)); | |
4dfb2365 | 884 | old_cleanups = make_cleanup_free_section_addr_info (sai); |
4efc6507 DE |
885 | i = 0; |
886 | for (sec = nbfd->sections; sec != NULL; sec = sec->next) | |
887 | if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0) | |
888 | { | |
889 | /* We assume that these virtual addresses are absolute, and do not | |
890 | treat them as offsets. */ | |
891 | sai->other[i].addr = bfd_get_section_vma (nbfd, sec); | |
04a679b8 | 892 | sai->other[i].name = xstrdup (bfd_get_section_name (nbfd, sec)); |
4efc6507 DE |
893 | sai->other[i].sectindex = sec->index; |
894 | ++i; | |
895 | } | |
896 | ||
4dfb2365 | 897 | /* This call takes ownership of NBFD. It does not take ownership of SAI. */ |
63524580 | 898 | objfile = symbol_file_add_from_bfd (nbfd, 0, sai, OBJF_SHARED, NULL); |
4efc6507 | 899 | |
4dfb2365 | 900 | do_cleanups (old_cleanups); |
744ab88c | 901 | add_objfile_entry (objfile, entry_addr); |
1825a88d SD |
902 | } |
903 | ||
904 | /* This function registers code associated with a JIT code entry. It uses the | |
905 | pointer and size pair in the entry to read the symbol file from the remote | |
906 | and then calls symbol_file_add_from_local_memory to add it as though it were | |
907 | a symbol file added by the user. */ | |
908 | ||
909 | static void | |
910 | jit_register_code (struct gdbarch *gdbarch, | |
911 | CORE_ADDR entry_addr, struct jit_code_entry *code_entry) | |
912 | { | |
913 | int i, success; | |
914 | const struct bfd_arch_info *b; | |
915 | struct jit_inferior_data *inf_data = get_jit_inferior_data (); | |
916 | ||
917 | if (jit_debug) | |
918 | fprintf_unfiltered (gdb_stdlog, | |
919 | "jit_register_code, symfile_addr = %s, " | |
920 | "symfile_size = %s\n", | |
921 | paddress (gdbarch, code_entry->symfile_addr), | |
922 | pulongest (code_entry->symfile_size)); | |
923 | ||
744ab88c | 924 | success = jit_reader_try_read_symtab (code_entry, entry_addr); |
1825a88d SD |
925 | |
926 | if (!success) | |
744ab88c | 927 | jit_bfd_try_read_symtab (code_entry, entry_addr, gdbarch); |
4efc6507 DE |
928 | } |
929 | ||
1777feb0 MS |
930 | /* This function unregisters JITed code and frees the corresponding |
931 | objfile. */ | |
4efc6507 DE |
932 | |
933 | static void | |
934 | jit_unregister_code (struct objfile *objfile) | |
935 | { | |
936 | free_objfile (objfile); | |
937 | } | |
938 | ||
939 | /* Look up the objfile with this code entry address. */ | |
940 | ||
941 | static struct objfile * | |
942 | jit_find_objf_with_entry_addr (CORE_ADDR entry_addr) | |
943 | { | |
944 | struct objfile *objf; | |
945 | CORE_ADDR *objf_entry_addr; | |
946 | ||
947 | ALL_OBJFILES (objf) | |
948 | { | |
03bef283 TT |
949 | struct jit_objfile_data *objf_data; |
950 | ||
951 | objf_data = objfile_data (objf, jit_objfile_data); | |
952 | if (objf_data != NULL && objf_data->addr == entry_addr) | |
4efc6507 DE |
953 | return objf; |
954 | } | |
955 | return NULL; | |
956 | } | |
957 | ||
03673fc7 PP |
958 | /* (Re-)Initialize the jit breakpoint if necessary. |
959 | Return 0 on success. */ | |
960 | ||
961 | static int | |
962 | jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, | |
963 | struct jit_inferior_data *inf_data) | |
964 | { | |
03bef283 TT |
965 | struct minimal_symbol *reg_symbol, *desc_symbol; |
966 | struct objfile *objf; | |
967 | struct jit_objfile_data *objf_data; | |
968 | ||
969 | if (inf_data->objfile != NULL) | |
03673fc7 PP |
970 | return 0; |
971 | ||
03bef283 TT |
972 | /* Lookup the registration symbol. If it is missing, then we assume |
973 | we are not attached to a JIT. */ | |
974 | reg_symbol = lookup_minimal_symbol_and_objfile (jit_break_name, &objf); | |
975 | if (reg_symbol == NULL || SYMBOL_VALUE_ADDRESS (reg_symbol) == 0) | |
976 | return 1; | |
977 | ||
978 | desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, objf); | |
979 | if (desc_symbol == NULL || SYMBOL_VALUE_ADDRESS (desc_symbol) == 0) | |
980 | return 1; | |
981 | ||
982 | objf_data = get_jit_objfile_data (objf); | |
983 | objf_data->register_code = reg_symbol; | |
984 | objf_data->descriptor = desc_symbol; | |
985 | ||
986 | inf_data->objfile = objf; | |
987 | ||
988 | jit_inferior_init (gdbarch); | |
989 | ||
03673fc7 PP |
990 | if (jit_debug) |
991 | fprintf_unfiltered (gdb_stdlog, | |
992 | "jit_breakpoint_re_set_internal, " | |
993 | "breakpoint_addr = %s\n", | |
03bef283 | 994 | paddress (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol))); |
03673fc7 PP |
995 | |
996 | /* Put a breakpoint in the registration symbol. */ | |
03bef283 | 997 | create_jit_event_breakpoint (gdbarch, SYMBOL_VALUE_ADDRESS (reg_symbol)); |
03673fc7 PP |
998 | |
999 | return 0; | |
1000 | } | |
1001 | ||
3623dc3a SD |
1002 | /* The private data passed around in the frame unwind callback |
1003 | functions. */ | |
1004 | ||
1005 | struct jit_unwind_private | |
1006 | { | |
1007 | /* Cached register values. See jit_frame_sniffer to see how this | |
1008 | works. */ | |
1009 | struct gdb_reg_value **registers; | |
1010 | ||
1011 | /* The frame being unwound. */ | |
1012 | struct frame_info *this_frame; | |
1013 | }; | |
1014 | ||
1015 | /* Sets the value of a particular register in this frame. */ | |
1016 | ||
1017 | static void | |
1018 | jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum, | |
1019 | struct gdb_reg_value *value) | |
1020 | { | |
1021 | struct jit_unwind_private *priv; | |
1022 | int gdb_reg; | |
1023 | ||
1024 | priv = cb->priv_data; | |
1025 | ||
1026 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame), | |
1027 | dwarf_regnum); | |
1028 | if (gdb_reg == -1) | |
1029 | { | |
1030 | if (jit_debug) | |
1031 | fprintf_unfiltered (gdb_stdlog, | |
1032 | _("Could not recognize DWARF regnum %d"), | |
1033 | dwarf_regnum); | |
1034 | return; | |
1035 | } | |
1036 | ||
1037 | gdb_assert (priv->registers); | |
1038 | priv->registers[gdb_reg] = value; | |
1039 | } | |
1040 | ||
1041 | static void | |
1042 | reg_value_free_impl (struct gdb_reg_value *value) | |
1043 | { | |
1044 | xfree (value); | |
1045 | } | |
1046 | ||
1047 | /* Get the value of register REGNUM in the previous frame. */ | |
1048 | ||
1049 | static struct gdb_reg_value * | |
1050 | jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum) | |
1051 | { | |
1052 | struct jit_unwind_private *priv; | |
1053 | struct gdb_reg_value *value; | |
1054 | int gdb_reg, size; | |
1055 | struct gdbarch *frame_arch; | |
1056 | ||
1057 | priv = cb->priv_data; | |
1058 | frame_arch = get_frame_arch (priv->this_frame); | |
1059 | ||
1060 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum); | |
1061 | size = register_size (frame_arch, gdb_reg); | |
1062 | value = xmalloc (sizeof (struct gdb_reg_value) + size - 1); | |
1063 | value->defined = frame_register_read (priv->this_frame, gdb_reg, | |
1064 | value->value); | |
1065 | value->size = size; | |
1066 | value->free = reg_value_free_impl; | |
1067 | return value; | |
1068 | } | |
1069 | ||
1070 | /* gdb_reg_value has a free function, which must be called on each | |
1071 | saved register value. */ | |
1072 | ||
1073 | static void | |
1074 | jit_dealloc_cache (struct frame_info *this_frame, void *cache) | |
1075 | { | |
1076 | struct jit_unwind_private *priv_data = cache; | |
1077 | struct gdbarch *frame_arch; | |
1078 | int i; | |
1079 | ||
1080 | gdb_assert (priv_data->registers); | |
1081 | frame_arch = get_frame_arch (priv_data->this_frame); | |
1082 | ||
1083 | for (i = 0; i < gdbarch_num_regs (frame_arch); i++) | |
1084 | if (priv_data->registers[i] && priv_data->registers[i]->free) | |
1085 | priv_data->registers[i]->free (priv_data->registers[i]); | |
1086 | ||
1087 | xfree (priv_data->registers); | |
1088 | xfree (priv_data); | |
1089 | } | |
1090 | ||
1091 | /* The frame sniffer for the pseudo unwinder. | |
1092 | ||
1093 | While this is nominally a frame sniffer, in the case where the JIT | |
1094 | reader actually recognizes the frame, it does a lot more work -- it | |
1095 | unwinds the frame and saves the corresponding register values in | |
1096 | the cache. jit_frame_prev_register simply returns the saved | |
1097 | register values. */ | |
1098 | ||
1099 | static int | |
1100 | jit_frame_sniffer (const struct frame_unwind *self, | |
1101 | struct frame_info *this_frame, void **cache) | |
1102 | { | |
1103 | struct jit_inferior_data *inf_data; | |
1104 | struct jit_unwind_private *priv_data; | |
1105 | struct jit_dbg_reader *iter; | |
1106 | struct gdb_unwind_callbacks callbacks; | |
1107 | struct gdb_reader_funcs *funcs; | |
1108 | ||
1109 | inf_data = get_jit_inferior_data (); | |
1110 | ||
1111 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1112 | callbacks.reg_set = jit_unwind_reg_set_impl; | |
1113 | callbacks.target_read = jit_target_read_impl; | |
1114 | ||
1115 | if (loaded_jit_reader == NULL) | |
1116 | return 0; | |
1117 | ||
1118 | funcs = loaded_jit_reader->functions; | |
1119 | ||
1120 | gdb_assert (!*cache); | |
1121 | ||
1122 | *cache = XZALLOC (struct jit_unwind_private); | |
1123 | priv_data = *cache; | |
1124 | priv_data->registers = | |
1125 | XCALLOC (gdbarch_num_regs (get_frame_arch (this_frame)), | |
1126 | struct gdb_reg_value *); | |
1127 | priv_data->this_frame = this_frame; | |
1128 | ||
1129 | callbacks.priv_data = priv_data; | |
1130 | ||
1131 | /* Try to coax the provided unwinder to unwind the stack */ | |
1132 | if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS) | |
1133 | { | |
1134 | if (jit_debug) | |
1135 | fprintf_unfiltered (gdb_stdlog, _("Successfully unwound frame using " | |
1136 | "JIT reader.\n")); | |
1137 | return 1; | |
1138 | } | |
1139 | if (jit_debug) | |
1140 | fprintf_unfiltered (gdb_stdlog, _("Could not unwind frame using " | |
1141 | "JIT reader.\n")); | |
1142 | ||
1143 | jit_dealloc_cache (this_frame, *cache); | |
1144 | *cache = NULL; | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | ||
1149 | ||
1150 | /* The frame_id function for the pseudo unwinder. Relays the call to | |
1151 | the loaded plugin. */ | |
1152 | ||
1153 | static void | |
1154 | jit_frame_this_id (struct frame_info *this_frame, void **cache, | |
1155 | struct frame_id *this_id) | |
1156 | { | |
1157 | struct jit_unwind_private private; | |
1158 | struct gdb_frame_id frame_id; | |
1159 | struct gdb_reader_funcs *funcs; | |
1160 | struct gdb_unwind_callbacks callbacks; | |
1161 | ||
1162 | private.registers = NULL; | |
1163 | private.this_frame = this_frame; | |
1164 | ||
1165 | /* We don't expect the frame_id function to set any registers, so we | |
1166 | set reg_set to NULL. */ | |
1167 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1168 | callbacks.reg_set = NULL; | |
1169 | callbacks.target_read = jit_target_read_impl; | |
1170 | callbacks.priv_data = &private; | |
1171 | ||
1172 | gdb_assert (loaded_jit_reader); | |
1173 | funcs = loaded_jit_reader->functions; | |
1174 | ||
1175 | frame_id = funcs->get_frame_id (funcs, &callbacks); | |
1176 | *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address); | |
1177 | } | |
1178 | ||
1179 | /* Pseudo unwinder function. Reads the previously fetched value for | |
1180 | the register from the cache. */ | |
1181 | ||
1182 | static struct value * | |
1183 | jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg) | |
1184 | { | |
1185 | struct jit_unwind_private *priv = *cache; | |
1186 | struct gdb_reg_value *value; | |
1187 | ||
1188 | if (priv == NULL) | |
1189 | return frame_unwind_got_optimized (this_frame, reg); | |
1190 | ||
1191 | gdb_assert (priv->registers); | |
1192 | value = priv->registers[reg]; | |
1193 | if (value && value->defined) | |
1194 | return frame_unwind_got_bytes (this_frame, reg, value->value); | |
1195 | else | |
1196 | return frame_unwind_got_optimized (this_frame, reg); | |
1197 | } | |
1198 | ||
1199 | /* Relay everything back to the unwinder registered by the JIT debug | |
1200 | info reader.*/ | |
1201 | ||
1202 | static const struct frame_unwind jit_frame_unwind = | |
1203 | { | |
1204 | NORMAL_FRAME, | |
1205 | default_frame_unwind_stop_reason, | |
1206 | jit_frame_this_id, | |
1207 | jit_frame_prev_register, | |
1208 | NULL, | |
1209 | jit_frame_sniffer, | |
1210 | jit_dealloc_cache | |
1211 | }; | |
1212 | ||
1213 | ||
1214 | /* This is the information that is stored at jit_gdbarch_data for each | |
1215 | architecture. */ | |
1216 | ||
1217 | struct jit_gdbarch_data_type | |
1218 | { | |
1219 | /* Has the (pseudo) unwinder been prepended? */ | |
1220 | int unwinder_registered; | |
1221 | }; | |
1222 | ||
1223 | /* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */ | |
1224 | ||
1225 | static void | |
1226 | jit_prepend_unwinder (struct gdbarch *gdbarch) | |
1227 | { | |
1228 | struct jit_gdbarch_data_type *data; | |
1229 | ||
1230 | data = gdbarch_data (gdbarch, jit_gdbarch_data); | |
1231 | if (!data->unwinder_registered) | |
1232 | { | |
1233 | frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind); | |
1234 | data->unwinder_registered = 1; | |
1235 | } | |
1236 | } | |
1237 | ||
03673fc7 | 1238 | /* Register any already created translations. */ |
0756c555 DE |
1239 | |
1240 | static void | |
1241 | jit_inferior_init (struct gdbarch *gdbarch) | |
4efc6507 | 1242 | { |
4efc6507 DE |
1243 | struct jit_descriptor descriptor; |
1244 | struct jit_code_entry cur_entry; | |
03673fc7 | 1245 | struct jit_inferior_data *inf_data; |
4efc6507 | 1246 | CORE_ADDR cur_entry_addr; |
03bef283 | 1247 | struct jit_objfile_data *objf_data; |
4efc6507 | 1248 | |
a255712f | 1249 | if (jit_debug) |
03673fc7 | 1250 | fprintf_unfiltered (gdb_stdlog, "jit_inferior_init\n"); |
a255712f | 1251 | |
3623dc3a SD |
1252 | jit_prepend_unwinder (gdbarch); |
1253 | ||
03673fc7 PP |
1254 | inf_data = get_jit_inferior_data (); |
1255 | if (jit_breakpoint_re_set_internal (gdbarch, inf_data) != 0) | |
4efc6507 DE |
1256 | return; |
1257 | ||
1777feb0 MS |
1258 | /* Read the descriptor so we can check the version number and load |
1259 | any already JITed functions. */ | |
03bef283 TT |
1260 | if (!jit_read_descriptor (gdbarch, &descriptor, inf_data)) |
1261 | return; | |
4efc6507 DE |
1262 | |
1263 | /* Check that the version number agrees with that we support. */ | |
1264 | if (descriptor.version != 1) | |
03bef283 TT |
1265 | { |
1266 | printf_unfiltered (_("Unsupported JIT protocol version %ld " | |
1267 | "in descriptor (expected 1)\n"), | |
1268 | (long) descriptor.version); | |
1269 | return; | |
1270 | } | |
4efc6507 | 1271 | |
1777feb0 MS |
1272 | /* If we've attached to a running program, we need to check the descriptor |
1273 | to register any functions that were already generated. */ | |
4efc6507 DE |
1274 | for (cur_entry_addr = descriptor.first_entry; |
1275 | cur_entry_addr != 0; | |
1276 | cur_entry_addr = cur_entry.next_entry) | |
1277 | { | |
0756c555 | 1278 | jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1279 | |
1280 | /* This hook may be called many times during setup, so make sure we don't | |
1281 | add the same symbol file twice. */ | |
1282 | if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL) | |
1283 | continue; | |
1284 | ||
0756c555 | 1285 | jit_register_code (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1286 | } |
1287 | } | |
1288 | ||
0756c555 DE |
1289 | /* Exported routine to call when an inferior has been created. */ |
1290 | ||
1291 | void | |
1292 | jit_inferior_created_hook (void) | |
1293 | { | |
1294 | jit_inferior_init (target_gdbarch); | |
1295 | } | |
1296 | ||
1297 | /* Exported routine to call to re-set the jit breakpoints, | |
1298 | e.g. when a program is rerun. */ | |
1299 | ||
1300 | void | |
1301 | jit_breakpoint_re_set (void) | |
1302 | { | |
03673fc7 PP |
1303 | jit_breakpoint_re_set_internal (target_gdbarch, |
1304 | get_jit_inferior_data ()); | |
1305 | } | |
1306 | ||
1777feb0 MS |
1307 | /* This function cleans up any code entries left over when the |
1308 | inferior exits. We get left over code when the inferior exits | |
1309 | without unregistering its code, for example when it crashes. */ | |
4efc6507 DE |
1310 | |
1311 | static void | |
a79b8f6e | 1312 | jit_inferior_exit_hook (struct inferior *inf) |
4efc6507 DE |
1313 | { |
1314 | struct objfile *objf; | |
1315 | struct objfile *temp; | |
1316 | ||
4efc6507 | 1317 | ALL_OBJFILES_SAFE (objf, temp) |
03bef283 TT |
1318 | { |
1319 | struct jit_objfile_data *objf_data = objfile_data (objf, | |
1320 | jit_objfile_data); | |
4efc6507 | 1321 | |
03bef283 TT |
1322 | if (objf_data != NULL && objf_data->addr != 0) |
1323 | jit_unregister_code (objf); | |
1324 | } | |
03673fc7 PP |
1325 | } |
1326 | ||
4efc6507 | 1327 | void |
0756c555 | 1328 | jit_event_handler (struct gdbarch *gdbarch) |
4efc6507 DE |
1329 | { |
1330 | struct jit_descriptor descriptor; | |
1331 | struct jit_code_entry code_entry; | |
1332 | CORE_ADDR entry_addr; | |
1333 | struct objfile *objf; | |
1334 | ||
1335 | /* Read the descriptor from remote memory. */ | |
03bef283 TT |
1336 | if (!jit_read_descriptor (gdbarch, &descriptor, get_jit_inferior_data ())) |
1337 | return; | |
4efc6507 DE |
1338 | entry_addr = descriptor.relevant_entry; |
1339 | ||
1777feb0 | 1340 | /* Do the corresponding action. */ |
4efc6507 DE |
1341 | switch (descriptor.action_flag) |
1342 | { | |
1343 | case JIT_NOACTION: | |
1344 | break; | |
1345 | case JIT_REGISTER: | |
0756c555 DE |
1346 | jit_read_code_entry (gdbarch, entry_addr, &code_entry); |
1347 | jit_register_code (gdbarch, entry_addr, &code_entry); | |
4efc6507 DE |
1348 | break; |
1349 | case JIT_UNREGISTER: | |
1350 | objf = jit_find_objf_with_entry_addr (entry_addr); | |
1351 | if (objf == NULL) | |
1777feb0 MS |
1352 | printf_unfiltered (_("Unable to find JITed code " |
1353 | "entry at address: %s\n"), | |
dfdbc9b4 | 1354 | paddress (gdbarch, entry_addr)); |
4efc6507 DE |
1355 | else |
1356 | jit_unregister_code (objf); | |
1357 | ||
1358 | break; | |
1359 | default: | |
1360 | error (_("Unknown action_flag value in JIT descriptor!")); | |
1361 | break; | |
1362 | } | |
1363 | } | |
1364 | ||
1825a88d SD |
1365 | /* Called to free the data allocated to the jit_inferior_data slot. */ |
1366 | ||
1367 | static void | |
1368 | free_objfile_data (struct objfile *objfile, void *data) | |
1369 | { | |
03bef283 TT |
1370 | struct jit_objfile_data *objf_data = data; |
1371 | ||
1372 | if (objf_data->register_code != NULL) | |
1373 | { | |
1374 | struct jit_inferior_data *inf_data = get_jit_inferior_data (); | |
1375 | ||
1376 | if (inf_data->objfile == objfile) | |
1377 | inf_data->objfile = NULL; | |
1378 | } | |
1379 | ||
1825a88d SD |
1380 | xfree (data); |
1381 | } | |
1382 | ||
3623dc3a SD |
1383 | /* Initialize the jit_gdbarch_data slot with an instance of struct |
1384 | jit_gdbarch_data_type */ | |
1385 | ||
1386 | static void * | |
1387 | jit_gdbarch_data_init (struct obstack *obstack) | |
1388 | { | |
1389 | struct jit_gdbarch_data_type *data; | |
1390 | ||
1391 | data = obstack_alloc (obstack, sizeof (struct jit_gdbarch_data_type)); | |
1392 | data->unwinder_registered = 0; | |
1393 | return data; | |
1394 | } | |
1395 | ||
4efc6507 DE |
1396 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1397 | ||
1398 | extern void _initialize_jit (void); | |
1399 | ||
1400 | void | |
1401 | _initialize_jit (void) | |
1402 | { | |
b8e0a31c SD |
1403 | jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR, |
1404 | JIT_READER_DIR_RELOCATABLE); | |
1777feb0 MS |
1405 | add_setshow_zinteger_cmd ("jit", class_maintenance, &jit_debug, |
1406 | _("Set JIT debugging."), | |
1407 | _("Show JIT debugging."), | |
1408 | _("When non-zero, JIT debugging is enabled."), | |
a255712f PP |
1409 | NULL, |
1410 | show_jit_debug, | |
1411 | &setdebuglist, &showdebuglist); | |
1412 | ||
4efc6507 | 1413 | observer_attach_inferior_exit (jit_inferior_exit_hook); |
1825a88d SD |
1414 | jit_objfile_data = |
1415 | register_objfile_data_with_cleanup (NULL, free_objfile_data); | |
03673fc7 PP |
1416 | jit_inferior_data = |
1417 | register_inferior_data_with_cleanup (jit_inferior_data_cleanup); | |
3623dc3a | 1418 | jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init); |
784c47ee SD |
1419 | if (is_dl_available ()) |
1420 | { | |
1421 | add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\ | |
1422 | Load FILE as debug info reader and unwinder for JIT compiled code.\n\ | |
1423 | Usage: jit-reader-load FILE\n\ | |
1424 | Try to load file FILE as a debug info reader (and unwinder) for\n\ | |
1425 | JIT compiled code. The file is loaded from " JIT_READER_DIR ",\n\ | |
1426 | relocated relative to the GDB executable if required.")); | |
1427 | add_com ("jit-reader-unload", no_class, jit_reader_unload_command, _("\ | |
1428 | Unload the currently loaded JIT debug info reader.\n\ | |
1429 | Usage: jit-reader-unload FILE\n\n\ | |
1430 | Do \"help jit-reader-load\" for info on loading debug info readers.")); | |
1431 | } | |
4efc6507 | 1432 | } |