Commit | Line | Data |
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4efc6507 DE |
1 | /* Handle JIT code generation in the inferior for GDB, the GNU Debugger. |
2 | ||
7b6bb8da | 3 | Copyright (C) 2009, 2010, 2011 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 | ||
784c47ee SD |
130 | /* One reader that has been loaded successfully, and can potentially be used to |
131 | parse debug info. */ | |
132 | ||
133 | static struct jit_reader | |
134 | { | |
135 | struct gdb_reader_funcs *functions; | |
136 | void *handle; | |
137 | } *loaded_jit_reader = NULL; | |
138 | ||
139 | typedef struct gdb_reader_funcs * (reader_init_fn_type) (void); | |
140 | static const char *reader_init_fn_sym = "gdb_init_reader"; | |
141 | ||
142 | /* Try to load FILE_NAME as a JIT debug info reader. */ | |
143 | ||
144 | static struct jit_reader * | |
145 | jit_reader_load (const char *file_name) | |
146 | { | |
147 | void *so; | |
148 | reader_init_fn_type *init_fn; | |
149 | struct jit_reader *new_reader = NULL; | |
150 | struct gdb_reader_funcs *funcs = NULL; | |
151 | struct cleanup *old_cleanups; | |
152 | ||
153 | if (jit_debug) | |
154 | fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"), | |
155 | file_name); | |
156 | so = gdb_dlopen (file_name); | |
157 | old_cleanups = make_cleanup_dlclose (so); | |
158 | ||
159 | init_fn = gdb_dlsym (so, reader_init_fn_sym); | |
160 | if (!init_fn) | |
161 | error (_("Could not locate initialization function: %s."), | |
162 | reader_init_fn_sym); | |
163 | ||
164 | if (gdb_dlsym (so, "plugin_is_GPL_compatible") == NULL) | |
165 | error (_("Reader not GPL compatible.")); | |
166 | ||
167 | funcs = init_fn (); | |
168 | if (funcs->reader_version != GDB_READER_INTERFACE_VERSION) | |
169 | error (_("Reader version does not match GDB version.")); | |
170 | ||
171 | new_reader = XZALLOC (struct jit_reader); | |
172 | new_reader->functions = funcs; | |
173 | new_reader->handle = so; | |
174 | ||
175 | discard_cleanups (old_cleanups); | |
176 | return new_reader; | |
177 | } | |
178 | ||
179 | /* Provides the jit-reader-load command. */ | |
180 | ||
181 | static void | |
182 | jit_reader_load_command (char *args, int from_tty) | |
183 | { | |
184 | char *so_name; | |
185 | int len; | |
186 | struct cleanup *prev_cleanup; | |
187 | ||
188 | if (args == NULL) | |
189 | error (_("No reader name provided.")); | |
190 | ||
191 | if (loaded_jit_reader != NULL) | |
192 | error (_("JIT reader already loaded. Run jit-reader-unload first.")); | |
193 | ||
194 | so_name = xstrprintf ("%s/%s", jit_reader_dir, args); | |
195 | prev_cleanup = make_cleanup (xfree, so_name); | |
196 | ||
197 | loaded_jit_reader = jit_reader_load (so_name); | |
198 | do_cleanups (prev_cleanup); | |
199 | } | |
200 | ||
201 | /* Provides the jit-reader-unload command. */ | |
202 | ||
203 | static void | |
204 | jit_reader_unload_command (char *args, int from_tty) | |
205 | { | |
206 | if (!loaded_jit_reader) | |
207 | error (_("No JIT reader loaded.")); | |
208 | ||
209 | loaded_jit_reader->functions->destroy (loaded_jit_reader->functions); | |
210 | ||
211 | gdb_dlclose (loaded_jit_reader->handle); | |
212 | xfree (loaded_jit_reader); | |
213 | loaded_jit_reader = NULL; | |
214 | } | |
215 | ||
4efc6507 DE |
216 | /* Open a BFD from the target's memory. */ |
217 | ||
218 | static struct bfd * | |
a255712f | 219 | bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size, char *target) |
4efc6507 DE |
220 | { |
221 | const char *filename = xstrdup ("<in-memory>"); | |
222 | struct target_buffer *buffer = xmalloc (sizeof (struct target_buffer)); | |
223 | ||
224 | buffer->base = addr; | |
225 | buffer->size = size; | |
226 | return bfd_openr_iovec (filename, target, | |
227 | mem_bfd_iovec_open, | |
228 | buffer, | |
229 | mem_bfd_iovec_pread, | |
230 | mem_bfd_iovec_close, | |
231 | mem_bfd_iovec_stat); | |
232 | } | |
233 | ||
03673fc7 PP |
234 | /* Per-inferior structure recording the addresses in the inferior. */ |
235 | ||
236 | struct jit_inferior_data | |
237 | { | |
238 | CORE_ADDR breakpoint_addr; /* &__jit_debug_register_code() */ | |
239 | CORE_ADDR descriptor_addr; /* &__jit_debug_descriptor */ | |
240 | }; | |
241 | ||
1825a88d SD |
242 | /* Remember a mapping from entry_addr to objfile. */ |
243 | ||
244 | static void | |
245 | add_objfile_entry (struct objfile *objfile, CORE_ADDR entry) | |
246 | { | |
247 | CORE_ADDR *entry_addr_ptr; | |
248 | ||
249 | entry_addr_ptr = xmalloc (sizeof (CORE_ADDR)); | |
250 | *entry_addr_ptr = entry; | |
251 | set_objfile_data (objfile, jit_objfile_data, entry_addr_ptr); | |
252 | } | |
253 | ||
03673fc7 PP |
254 | /* Return jit_inferior_data for current inferior. Allocate if not already |
255 | present. */ | |
256 | ||
257 | static struct jit_inferior_data * | |
258 | get_jit_inferior_data (void) | |
259 | { | |
260 | struct inferior *inf; | |
261 | struct jit_inferior_data *inf_data; | |
262 | ||
263 | inf = current_inferior (); | |
264 | inf_data = inferior_data (inf, jit_inferior_data); | |
265 | if (inf_data == NULL) | |
266 | { | |
267 | inf_data = XZALLOC (struct jit_inferior_data); | |
268 | set_inferior_data (inf, jit_inferior_data, inf_data); | |
269 | } | |
270 | ||
271 | return inf_data; | |
272 | } | |
273 | ||
274 | static void | |
275 | jit_inferior_data_cleanup (struct inferior *inf, void *arg) | |
276 | { | |
277 | xfree (arg); | |
278 | } | |
279 | ||
1777feb0 MS |
280 | /* Helper function for reading the global JIT descriptor from remote |
281 | memory. */ | |
4efc6507 DE |
282 | |
283 | static void | |
0756c555 | 284 | jit_read_descriptor (struct gdbarch *gdbarch, |
03673fc7 PP |
285 | struct jit_descriptor *descriptor, |
286 | CORE_ADDR descriptor_addr) | |
4efc6507 DE |
287 | { |
288 | int err; | |
289 | struct type *ptr_type; | |
290 | int ptr_size; | |
291 | int desc_size; | |
292 | gdb_byte *desc_buf; | |
0756c555 | 293 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4efc6507 DE |
294 | |
295 | /* Figure out how big the descriptor is on the remote and how to read it. */ | |
0756c555 | 296 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
297 | ptr_size = TYPE_LENGTH (ptr_type); |
298 | desc_size = 8 + 2 * ptr_size; /* Two 32-bit ints and two pointers. */ | |
299 | desc_buf = alloca (desc_size); | |
300 | ||
301 | /* Read the descriptor. */ | |
03673fc7 | 302 | err = target_read_memory (descriptor_addr, desc_buf, desc_size); |
4efc6507 DE |
303 | if (err) |
304 | error (_("Unable to read JIT descriptor from remote memory!")); | |
305 | ||
306 | /* Fix the endianness to match the host. */ | |
307 | descriptor->version = extract_unsigned_integer (&desc_buf[0], 4, byte_order); | |
308 | descriptor->action_flag = | |
309 | extract_unsigned_integer (&desc_buf[4], 4, byte_order); | |
310 | descriptor->relevant_entry = extract_typed_address (&desc_buf[8], ptr_type); | |
311 | descriptor->first_entry = | |
312 | extract_typed_address (&desc_buf[8 + ptr_size], ptr_type); | |
313 | } | |
314 | ||
315 | /* Helper function for reading a JITed code entry from remote memory. */ | |
316 | ||
317 | static void | |
0756c555 DE |
318 | jit_read_code_entry (struct gdbarch *gdbarch, |
319 | CORE_ADDR code_addr, struct jit_code_entry *code_entry) | |
4efc6507 | 320 | { |
205c306f | 321 | int err, off; |
4efc6507 DE |
322 | struct type *ptr_type; |
323 | int ptr_size; | |
324 | int entry_size; | |
205c306f | 325 | int align_bytes; |
4efc6507 | 326 | gdb_byte *entry_buf; |
0756c555 | 327 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
4efc6507 DE |
328 | |
329 | /* Figure out how big the entry is on the remote and how to read it. */ | |
0756c555 | 330 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
331 | ptr_size = TYPE_LENGTH (ptr_type); |
332 | entry_size = 3 * ptr_size + 8; /* Three pointers and one 64-bit int. */ | |
333 | entry_buf = alloca (entry_size); | |
334 | ||
335 | /* Read the entry. */ | |
336 | err = target_read_memory (code_addr, entry_buf, entry_size); | |
337 | if (err) | |
338 | error (_("Unable to read JIT code entry from remote memory!")); | |
339 | ||
340 | /* Fix the endianness to match the host. */ | |
0756c555 | 341 | ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
4efc6507 DE |
342 | code_entry->next_entry = extract_typed_address (&entry_buf[0], ptr_type); |
343 | code_entry->prev_entry = | |
344 | extract_typed_address (&entry_buf[ptr_size], ptr_type); | |
345 | code_entry->symfile_addr = | |
346 | extract_typed_address (&entry_buf[2 * ptr_size], ptr_type); | |
205c306f DM |
347 | |
348 | align_bytes = gdbarch_long_long_align_bit (gdbarch) / 8; | |
349 | off = 3 * ptr_size; | |
350 | off = (off + (align_bytes - 1)) & ~(align_bytes - 1); | |
351 | ||
4efc6507 | 352 | code_entry->symfile_size = |
205c306f | 353 | extract_unsigned_integer (&entry_buf[off], 8, byte_order); |
4efc6507 DE |
354 | } |
355 | ||
1825a88d SD |
356 | /* Proxy object for building a block. */ |
357 | ||
358 | struct gdb_block | |
359 | { | |
360 | /* gdb_blocks are linked into a tree structure. Next points to the | |
361 | next node at the same depth as this block and parent to the | |
362 | parent gdb_block. */ | |
363 | struct gdb_block *next, *parent; | |
364 | ||
365 | /* Points to the "real" block that is being built out of this | |
366 | instance. This block will be added to a blockvector, which will | |
367 | then be added to a symtab. */ | |
368 | struct block *real_block; | |
369 | ||
370 | /* The first and last code address corresponding to this block. */ | |
371 | CORE_ADDR begin, end; | |
372 | ||
373 | /* The name of this block (if any). If this is non-NULL, the | |
374 | FUNCTION symbol symbol is set to this value. */ | |
375 | const char *name; | |
376 | }; | |
377 | ||
378 | /* Proxy object for building a symtab. */ | |
379 | ||
380 | struct gdb_symtab | |
381 | { | |
382 | /* The list of blocks in this symtab. These will eventually be | |
383 | converted to real blocks. */ | |
384 | struct gdb_block *blocks; | |
385 | ||
386 | /* The number of blocks inserted. */ | |
387 | int nblocks; | |
388 | ||
389 | /* A mapping between line numbers to PC. */ | |
390 | struct linetable *linetable; | |
391 | ||
392 | /* The source file for this symtab. */ | |
393 | const char *file_name; | |
394 | struct gdb_symtab *next; | |
395 | }; | |
396 | ||
397 | /* Proxy object for building an object. */ | |
398 | ||
399 | struct gdb_object | |
400 | { | |
401 | struct gdb_symtab *symtabs; | |
402 | }; | |
403 | ||
404 | /* The type of the `private' data passed around by the callback | |
405 | functions. */ | |
406 | ||
407 | typedef CORE_ADDR jit_dbg_reader_data; | |
408 | ||
409 | /* The reader calls into this function to read data off the targets | |
410 | address space. */ | |
411 | ||
412 | static enum gdb_status | |
413 | jit_target_read_impl (GDB_CORE_ADDR target_mem, void *gdb_buf, int len) | |
414 | { | |
415 | int result = target_read_memory ((CORE_ADDR) target_mem, gdb_buf, len); | |
416 | if (result == 0) | |
417 | return GDB_SUCCESS; | |
418 | else | |
419 | return GDB_FAIL; | |
420 | } | |
421 | ||
422 | /* The reader calls into this function to create a new gdb_object | |
423 | which it can then pass around to the other callbacks. Right now, | |
424 | all that is required is allocating the memory. */ | |
425 | ||
426 | static struct gdb_object * | |
427 | jit_object_open_impl (struct gdb_symbol_callbacks *cb) | |
428 | { | |
429 | /* CB is not required right now, but sometime in the future we might | |
430 | need a handle to it, and we'd like to do that without breaking | |
431 | the ABI. */ | |
432 | return XZALLOC (struct gdb_object); | |
433 | } | |
434 | ||
435 | /* Readers call into this function to open a new gdb_symtab, which, | |
436 | again, is passed around to other callbacks. */ | |
437 | ||
438 | static struct gdb_symtab * | |
439 | jit_symtab_open_impl (struct gdb_symbol_callbacks *cb, | |
440 | struct gdb_object *object, | |
441 | const char *file_name) | |
442 | { | |
443 | struct gdb_symtab *ret; | |
444 | ||
445 | /* CB stays unused. See comment in jit_object_open_impl. */ | |
446 | ||
447 | ret = XZALLOC (struct gdb_symtab); | |
448 | ret->file_name = file_name ? xstrdup (file_name) : xstrdup (""); | |
449 | ret->next = object->symtabs; | |
450 | object->symtabs = ret; | |
451 | return ret; | |
452 | } | |
453 | ||
454 | /* Returns true if the block corresponding to old should be placed | |
455 | before the block corresponding to new in the final blockvector. */ | |
456 | ||
457 | static int | |
458 | compare_block (const struct gdb_block *const old, | |
459 | const struct gdb_block *const new) | |
460 | { | |
461 | if (old == NULL) | |
462 | return 1; | |
463 | if (old->begin < new->begin) | |
464 | return 1; | |
465 | else if (old->begin == new->begin) | |
466 | { | |
467 | if (old->end > new->end) | |
468 | return 1; | |
469 | else | |
470 | return 0; | |
471 | } | |
472 | else | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /* Called by readers to open a new gdb_block. This function also | |
477 | inserts the new gdb_block in the correct place in the corresponding | |
478 | gdb_symtab. */ | |
479 | ||
480 | static struct gdb_block * | |
481 | jit_block_open_impl (struct gdb_symbol_callbacks *cb, | |
482 | struct gdb_symtab *symtab, struct gdb_block *parent, | |
483 | GDB_CORE_ADDR begin, GDB_CORE_ADDR end, const char *name) | |
484 | { | |
485 | struct gdb_block *block = XZALLOC (struct gdb_block); | |
486 | ||
487 | block->next = symtab->blocks; | |
488 | block->begin = (CORE_ADDR) begin; | |
489 | block->end = (CORE_ADDR) end; | |
490 | block->name = name ? xstrdup (name) : NULL; | |
491 | block->parent = parent; | |
492 | ||
493 | /* Ensure that the blocks are inserted in the correct (reverse of | |
494 | the order expected by blockvector). */ | |
495 | if (compare_block (symtab->blocks, block)) | |
496 | { | |
497 | symtab->blocks = block; | |
498 | } | |
499 | else | |
500 | { | |
501 | struct gdb_block *i = symtab->blocks; | |
502 | ||
503 | for (;; i = i->next) | |
504 | { | |
505 | /* Guaranteed to terminate, since compare_block (NULL, _) | |
506 | returns 1. */ | |
507 | if (compare_block (i->next, block)) | |
508 | { | |
509 | block->next = i->next; | |
510 | i->next = block; | |
511 | break; | |
512 | } | |
513 | } | |
514 | } | |
515 | symtab->nblocks++; | |
516 | ||
517 | return block; | |
518 | } | |
519 | ||
520 | /* Readers call this to add a line mapping (from PC to line number) to | |
521 | a gdb_symtab. */ | |
4efc6507 DE |
522 | |
523 | static void | |
1825a88d SD |
524 | jit_symtab_line_mapping_add_impl (struct gdb_symbol_callbacks *cb, |
525 | struct gdb_symtab *stab, int nlines, | |
526 | struct gdb_line_mapping *map) | |
527 | { | |
528 | int i; | |
529 | ||
530 | if (nlines < 1) | |
531 | return; | |
532 | ||
533 | stab->linetable = xmalloc (sizeof (struct linetable) | |
534 | + (nlines - 1) * sizeof (struct linetable_entry)); | |
535 | stab->linetable->nitems = nlines; | |
536 | for (i = 0; i < nlines; i++) | |
537 | { | |
538 | stab->linetable->item[i].pc = (CORE_ADDR) map[i].pc; | |
539 | stab->linetable->item[i].line = map[i].line; | |
540 | } | |
541 | } | |
542 | ||
543 | /* Called by readers to close a gdb_symtab. Does not need to do | |
544 | anything as of now. */ | |
545 | ||
546 | static void | |
547 | jit_symtab_close_impl (struct gdb_symbol_callbacks *cb, | |
548 | struct gdb_symtab *stab) | |
549 | { | |
550 | /* Right now nothing needs to be done here. We may need to do some | |
551 | cleanup here in the future (again, without breaking the plugin | |
552 | ABI). */ | |
553 | } | |
554 | ||
555 | /* Transform STAB to a proper symtab, and add it it OBJFILE. */ | |
556 | ||
557 | static void | |
558 | finalize_symtab (struct gdb_symtab *stab, struct objfile *objfile) | |
559 | { | |
560 | struct symtab *symtab; | |
561 | struct gdb_block *gdb_block_iter, *gdb_block_iter_tmp; | |
562 | struct block *block_iter; | |
563 | int actual_nblocks, i, blockvector_size; | |
564 | CORE_ADDR begin, end; | |
565 | ||
566 | actual_nblocks = FIRST_LOCAL_BLOCK + stab->nblocks; | |
567 | ||
568 | symtab = allocate_symtab (stab->file_name, objfile); | |
569 | /* JIT compilers compile in memory. */ | |
570 | symtab->dirname = NULL; | |
571 | ||
572 | /* Copy over the linetable entry if one was provided. */ | |
573 | if (stab->linetable) | |
574 | { | |
575 | int size = ((stab->linetable->nitems - 1) | |
576 | * sizeof (struct linetable_entry) | |
577 | + sizeof (struct linetable)); | |
578 | LINETABLE (symtab) = obstack_alloc (&objfile->objfile_obstack, size); | |
579 | memcpy (LINETABLE (symtab), stab->linetable, size); | |
580 | } | |
581 | else | |
582 | { | |
583 | LINETABLE (symtab) = NULL; | |
584 | } | |
585 | ||
586 | blockvector_size = (sizeof (struct blockvector) | |
587 | + (actual_nblocks - 1) * sizeof (struct block *)); | |
588 | symtab->blockvector = obstack_alloc (&objfile->objfile_obstack, | |
589 | blockvector_size); | |
590 | ||
591 | /* (begin, end) will contain the PC range this entire blockvector | |
592 | spans. */ | |
593 | symtab->primary = 1; | |
594 | BLOCKVECTOR_MAP (symtab->blockvector) = NULL; | |
595 | begin = stab->blocks->begin; | |
596 | end = stab->blocks->end; | |
597 | BLOCKVECTOR_NBLOCKS (symtab->blockvector) = actual_nblocks; | |
598 | ||
599 | /* First run over all the gdb_block objects, creating a real block | |
600 | object for each. Simultaneously, keep setting the real_block | |
601 | fields. */ | |
602 | for (i = (actual_nblocks - 1), gdb_block_iter = stab->blocks; | |
603 | i >= FIRST_LOCAL_BLOCK; | |
604 | i--, gdb_block_iter = gdb_block_iter->next) | |
605 | { | |
606 | struct block *new_block = allocate_block (&objfile->objfile_obstack); | |
607 | struct symbol *block_name = obstack_alloc (&objfile->objfile_obstack, | |
608 | sizeof (struct symbol)); | |
609 | ||
610 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, | |
611 | NULL); | |
612 | /* The address range. */ | |
613 | BLOCK_START (new_block) = (CORE_ADDR) gdb_block_iter->begin; | |
614 | BLOCK_END (new_block) = (CORE_ADDR) gdb_block_iter->end; | |
615 | ||
616 | /* The name. */ | |
617 | memset (block_name, 0, sizeof (struct symbol)); | |
618 | SYMBOL_DOMAIN (block_name) = VAR_DOMAIN; | |
619 | SYMBOL_CLASS (block_name) = LOC_BLOCK; | |
620 | SYMBOL_SYMTAB (block_name) = symtab; | |
621 | SYMBOL_BLOCK_VALUE (block_name) = new_block; | |
622 | ||
623 | block_name->ginfo.name = obsavestring (gdb_block_iter->name, | |
624 | strlen (gdb_block_iter->name), | |
625 | &objfile->objfile_obstack); | |
626 | ||
627 | BLOCK_FUNCTION (new_block) = block_name; | |
628 | ||
629 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
630 | if (begin > BLOCK_START (new_block)) | |
631 | begin = BLOCK_START (new_block); | |
632 | if (end < BLOCK_END (new_block)) | |
633 | end = BLOCK_END (new_block); | |
634 | ||
635 | gdb_block_iter->real_block = new_block; | |
636 | } | |
637 | ||
638 | /* Now add the special blocks. */ | |
639 | block_iter = NULL; | |
640 | for (i = 0; i < FIRST_LOCAL_BLOCK; i++) | |
641 | { | |
642 | struct block *new_block = allocate_block (&objfile->objfile_obstack); | |
643 | BLOCK_DICT (new_block) = dict_create_linear (&objfile->objfile_obstack, | |
644 | NULL); | |
645 | BLOCK_SUPERBLOCK (new_block) = block_iter; | |
646 | block_iter = new_block; | |
647 | ||
648 | BLOCK_START (new_block) = (CORE_ADDR) begin; | |
649 | BLOCK_END (new_block) = (CORE_ADDR) end; | |
650 | ||
651 | BLOCKVECTOR_BLOCK (symtab->blockvector, i) = new_block; | |
652 | } | |
653 | ||
654 | /* Fill up the superblock fields for the real blocks, using the | |
655 | real_block fields populated earlier. */ | |
656 | for (gdb_block_iter = stab->blocks; | |
657 | gdb_block_iter; | |
658 | gdb_block_iter = gdb_block_iter->next) | |
659 | { | |
660 | if (gdb_block_iter->parent != NULL) | |
661 | BLOCK_SUPERBLOCK (gdb_block_iter->real_block) = | |
662 | gdb_block_iter->parent->real_block; | |
663 | } | |
664 | ||
665 | /* Free memory. */ | |
666 | gdb_block_iter = stab->blocks; | |
667 | ||
668 | for (gdb_block_iter = stab->blocks, gdb_block_iter_tmp = gdb_block_iter->next; | |
669 | gdb_block_iter; | |
670 | gdb_block_iter = gdb_block_iter_tmp) | |
671 | { | |
672 | xfree ((void *) gdb_block_iter->name); | |
673 | xfree (gdb_block_iter); | |
674 | } | |
675 | xfree (stab->linetable); | |
676 | xfree ((char *) stab->file_name); | |
677 | xfree (stab); | |
678 | } | |
679 | ||
680 | /* Called when closing a gdb_objfile. Converts OBJ to a proper | |
681 | objfile. */ | |
682 | ||
683 | static void | |
684 | jit_object_close_impl (struct gdb_symbol_callbacks *cb, | |
685 | struct gdb_object *obj) | |
686 | { | |
687 | struct gdb_symtab *i, *j; | |
688 | struct objfile *objfile; | |
689 | jit_dbg_reader_data *priv_data; | |
690 | ||
691 | priv_data = cb->priv_data; | |
692 | ||
693 | objfile = allocate_objfile (NULL, 0); | |
694 | objfile->gdbarch = target_gdbarch; | |
695 | ||
696 | objfile->msymbols = obstack_alloc (&objfile->objfile_obstack, | |
697 | sizeof (struct minimal_symbol)); | |
698 | memset (objfile->msymbols, 0, sizeof (struct minimal_symbol)); | |
699 | ||
700 | xfree (objfile->name); | |
701 | objfile->name = xstrdup ("<< JIT compiled code >>"); | |
702 | ||
703 | j = NULL; | |
704 | for (i = obj->symtabs; i; i = j) | |
705 | { | |
706 | j = i->next; | |
707 | finalize_symtab (i, objfile); | |
708 | } | |
709 | add_objfile_entry (objfile, *priv_data); | |
710 | xfree (obj); | |
711 | } | |
712 | ||
713 | /* Try to read CODE_ENTRY using the loaded jit reader (if any). */ | |
714 | ||
715 | static int | |
716 | jit_reader_try_read_symtab (struct jit_code_entry *code_entry) | |
717 | { | |
718 | void *gdb_mem; | |
719 | int status; | |
720 | struct jit_dbg_reader *i; | |
721 | jit_dbg_reader_data priv_data; | |
722 | struct gdb_reader_funcs *funcs; | |
723 | volatile struct gdb_exception e; | |
724 | struct gdb_symbol_callbacks callbacks = | |
725 | { | |
726 | jit_object_open_impl, | |
727 | jit_symtab_open_impl, | |
728 | jit_block_open_impl, | |
729 | jit_symtab_close_impl, | |
730 | jit_object_close_impl, | |
731 | ||
732 | jit_symtab_line_mapping_add_impl, | |
733 | jit_target_read_impl, | |
734 | ||
735 | &priv_data | |
736 | }; | |
737 | ||
738 | priv_data = code_entry->symfile_addr; | |
739 | ||
740 | if (!loaded_jit_reader) | |
741 | return 0; | |
742 | ||
743 | gdb_mem = xmalloc (code_entry->symfile_size); | |
744 | ||
745 | status = 1; | |
746 | TRY_CATCH (e, RETURN_MASK_ALL) | |
747 | if (target_read_memory (code_entry->symfile_addr, gdb_mem, | |
748 | code_entry->symfile_size)) | |
749 | status = 0; | |
750 | if (e.reason < 0) | |
751 | status = 0; | |
752 | ||
753 | if (status) | |
754 | { | |
755 | funcs = loaded_jit_reader->functions; | |
756 | if (funcs->read (funcs, &callbacks, gdb_mem, code_entry->symfile_size) | |
757 | != GDB_SUCCESS) | |
758 | status = 0; | |
759 | } | |
760 | ||
761 | xfree (gdb_mem); | |
762 | if (jit_debug && status == 0) | |
763 | fprintf_unfiltered (gdb_stdlog, | |
764 | "Could not read symtab using the loaded JIT reader.\n"); | |
765 | return status; | |
766 | } | |
767 | ||
768 | /* Try to read CODE_ENTRY using BFD. */ | |
769 | ||
770 | static void | |
771 | jit_bfd_try_read_symtab (struct jit_code_entry *code_entry, | |
772 | struct gdbarch *gdbarch) | |
4efc6507 DE |
773 | { |
774 | bfd *nbfd; | |
775 | struct section_addr_info *sai; | |
776 | struct bfd_section *sec; | |
777 | struct objfile *objfile; | |
4dfb2365 | 778 | struct cleanup *old_cleanups; |
4efc6507 DE |
779 | int i; |
780 | const struct bfd_arch_info *b; | |
4efc6507 | 781 | |
a255712f PP |
782 | if (jit_debug) |
783 | fprintf_unfiltered (gdb_stdlog, | |
784 | "jit_register_code, symfile_addr = %s, " | |
785 | "symfile_size = %s\n", | |
786 | paddress (gdbarch, code_entry->symfile_addr), | |
787 | pulongest (code_entry->symfile_size)); | |
788 | ||
4efc6507 DE |
789 | nbfd = bfd_open_from_target_memory (code_entry->symfile_addr, |
790 | code_entry->symfile_size, gnutarget); | |
4dfb2365 JK |
791 | if (nbfd == NULL) |
792 | { | |
793 | puts_unfiltered (_("Error opening JITed symbol file, ignoring it.\n")); | |
794 | return; | |
795 | } | |
4efc6507 DE |
796 | |
797 | /* Check the format. NOTE: This initializes important data that GDB uses! | |
798 | We would segfault later without this line. */ | |
799 | if (!bfd_check_format (nbfd, bfd_object)) | |
800 | { | |
801 | printf_unfiltered (_("\ | |
802 | JITed symbol file is not an object file, ignoring it.\n")); | |
4dfb2365 | 803 | bfd_close (nbfd); |
4efc6507 DE |
804 | return; |
805 | } | |
806 | ||
807 | /* Check bfd arch. */ | |
0756c555 | 808 | b = gdbarch_bfd_arch_info (gdbarch); |
4efc6507 DE |
809 | if (b->compatible (b, bfd_get_arch_info (nbfd)) != b) |
810 | warning (_("JITed object file architecture %s is not compatible " | |
811 | "with target architecture %s."), bfd_get_arch_info | |
812 | (nbfd)->printable_name, b->printable_name); | |
813 | ||
814 | /* Read the section address information out of the symbol file. Since the | |
815 | file is generated by the JIT at runtime, it should all of the absolute | |
816 | addresses that we care about. */ | |
817 | sai = alloc_section_addr_info (bfd_count_sections (nbfd)); | |
4dfb2365 | 818 | old_cleanups = make_cleanup_free_section_addr_info (sai); |
4efc6507 DE |
819 | i = 0; |
820 | for (sec = nbfd->sections; sec != NULL; sec = sec->next) | |
821 | if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0) | |
822 | { | |
823 | /* We assume that these virtual addresses are absolute, and do not | |
824 | treat them as offsets. */ | |
825 | sai->other[i].addr = bfd_get_section_vma (nbfd, sec); | |
04a679b8 | 826 | sai->other[i].name = xstrdup (bfd_get_section_name (nbfd, sec)); |
4efc6507 DE |
827 | sai->other[i].sectindex = sec->index; |
828 | ++i; | |
829 | } | |
830 | ||
4dfb2365 | 831 | /* This call takes ownership of NBFD. It does not take ownership of SAI. */ |
63524580 | 832 | objfile = symbol_file_add_from_bfd (nbfd, 0, sai, OBJF_SHARED, NULL); |
4efc6507 | 833 | |
4dfb2365 | 834 | do_cleanups (old_cleanups); |
1825a88d SD |
835 | add_objfile_entry (objfile, code_entry->symfile_addr); |
836 | } | |
837 | ||
838 | /* This function registers code associated with a JIT code entry. It uses the | |
839 | pointer and size pair in the entry to read the symbol file from the remote | |
840 | and then calls symbol_file_add_from_local_memory to add it as though it were | |
841 | a symbol file added by the user. */ | |
842 | ||
843 | static void | |
844 | jit_register_code (struct gdbarch *gdbarch, | |
845 | CORE_ADDR entry_addr, struct jit_code_entry *code_entry) | |
846 | { | |
847 | int i, success; | |
848 | const struct bfd_arch_info *b; | |
849 | struct jit_inferior_data *inf_data = get_jit_inferior_data (); | |
850 | ||
851 | if (jit_debug) | |
852 | fprintf_unfiltered (gdb_stdlog, | |
853 | "jit_register_code, symfile_addr = %s, " | |
854 | "symfile_size = %s\n", | |
855 | paddress (gdbarch, code_entry->symfile_addr), | |
856 | pulongest (code_entry->symfile_size)); | |
857 | ||
858 | success = jit_reader_try_read_symtab (code_entry); | |
859 | ||
860 | if (!success) | |
861 | jit_bfd_try_read_symtab (code_entry, gdbarch); | |
4efc6507 DE |
862 | } |
863 | ||
1777feb0 MS |
864 | /* This function unregisters JITed code and frees the corresponding |
865 | objfile. */ | |
4efc6507 DE |
866 | |
867 | static void | |
868 | jit_unregister_code (struct objfile *objfile) | |
869 | { | |
870 | free_objfile (objfile); | |
871 | } | |
872 | ||
873 | /* Look up the objfile with this code entry address. */ | |
874 | ||
875 | static struct objfile * | |
876 | jit_find_objf_with_entry_addr (CORE_ADDR entry_addr) | |
877 | { | |
878 | struct objfile *objf; | |
879 | CORE_ADDR *objf_entry_addr; | |
880 | ||
881 | ALL_OBJFILES (objf) | |
882 | { | |
883 | objf_entry_addr = (CORE_ADDR *) objfile_data (objf, jit_objfile_data); | |
884 | if (objf_entry_addr != NULL && *objf_entry_addr == entry_addr) | |
885 | return objf; | |
886 | } | |
887 | return NULL; | |
888 | } | |
889 | ||
03673fc7 PP |
890 | /* (Re-)Initialize the jit breakpoint if necessary. |
891 | Return 0 on success. */ | |
892 | ||
893 | static int | |
894 | jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, | |
895 | struct jit_inferior_data *inf_data) | |
896 | { | |
897 | if (inf_data->breakpoint_addr == 0) | |
898 | { | |
899 | struct minimal_symbol *reg_symbol; | |
900 | ||
901 | /* Lookup the registration symbol. If it is missing, then we assume | |
902 | we are not attached to a JIT. */ | |
903 | reg_symbol = lookup_minimal_symbol (jit_break_name, NULL, NULL); | |
904 | if (reg_symbol == NULL) | |
905 | return 1; | |
906 | inf_data->breakpoint_addr = SYMBOL_VALUE_ADDRESS (reg_symbol); | |
907 | if (inf_data->breakpoint_addr == 0) | |
908 | return 2; | |
3b2a0cf2 JB |
909 | |
910 | /* If we have not read the jit descriptor yet (e.g. because the JITer | |
911 | itself is in a shared library which just got loaded), do so now. */ | |
912 | if (inf_data->descriptor_addr == 0) | |
913 | jit_inferior_init (gdbarch); | |
03673fc7 PP |
914 | } |
915 | else | |
916 | return 0; | |
917 | ||
918 | if (jit_debug) | |
919 | fprintf_unfiltered (gdb_stdlog, | |
920 | "jit_breakpoint_re_set_internal, " | |
921 | "breakpoint_addr = %s\n", | |
922 | paddress (gdbarch, inf_data->breakpoint_addr)); | |
923 | ||
924 | /* Put a breakpoint in the registration symbol. */ | |
925 | create_jit_event_breakpoint (gdbarch, inf_data->breakpoint_addr); | |
926 | ||
927 | return 0; | |
928 | } | |
929 | ||
3623dc3a SD |
930 | /* The private data passed around in the frame unwind callback |
931 | functions. */ | |
932 | ||
933 | struct jit_unwind_private | |
934 | { | |
935 | /* Cached register values. See jit_frame_sniffer to see how this | |
936 | works. */ | |
937 | struct gdb_reg_value **registers; | |
938 | ||
939 | /* The frame being unwound. */ | |
940 | struct frame_info *this_frame; | |
941 | }; | |
942 | ||
943 | /* Sets the value of a particular register in this frame. */ | |
944 | ||
945 | static void | |
946 | jit_unwind_reg_set_impl (struct gdb_unwind_callbacks *cb, int dwarf_regnum, | |
947 | struct gdb_reg_value *value) | |
948 | { | |
949 | struct jit_unwind_private *priv; | |
950 | int gdb_reg; | |
951 | ||
952 | priv = cb->priv_data; | |
953 | ||
954 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (get_frame_arch (priv->this_frame), | |
955 | dwarf_regnum); | |
956 | if (gdb_reg == -1) | |
957 | { | |
958 | if (jit_debug) | |
959 | fprintf_unfiltered (gdb_stdlog, | |
960 | _("Could not recognize DWARF regnum %d"), | |
961 | dwarf_regnum); | |
962 | return; | |
963 | } | |
964 | ||
965 | gdb_assert (priv->registers); | |
966 | priv->registers[gdb_reg] = value; | |
967 | } | |
968 | ||
969 | static void | |
970 | reg_value_free_impl (struct gdb_reg_value *value) | |
971 | { | |
972 | xfree (value); | |
973 | } | |
974 | ||
975 | /* Get the value of register REGNUM in the previous frame. */ | |
976 | ||
977 | static struct gdb_reg_value * | |
978 | jit_unwind_reg_get_impl (struct gdb_unwind_callbacks *cb, int regnum) | |
979 | { | |
980 | struct jit_unwind_private *priv; | |
981 | struct gdb_reg_value *value; | |
982 | int gdb_reg, size; | |
983 | struct gdbarch *frame_arch; | |
984 | ||
985 | priv = cb->priv_data; | |
986 | frame_arch = get_frame_arch (priv->this_frame); | |
987 | ||
988 | gdb_reg = gdbarch_dwarf2_reg_to_regnum (frame_arch, regnum); | |
989 | size = register_size (frame_arch, gdb_reg); | |
990 | value = xmalloc (sizeof (struct gdb_reg_value) + size - 1); | |
991 | value->defined = frame_register_read (priv->this_frame, gdb_reg, | |
992 | value->value); | |
993 | value->size = size; | |
994 | value->free = reg_value_free_impl; | |
995 | return value; | |
996 | } | |
997 | ||
998 | /* gdb_reg_value has a free function, which must be called on each | |
999 | saved register value. */ | |
1000 | ||
1001 | static void | |
1002 | jit_dealloc_cache (struct frame_info *this_frame, void *cache) | |
1003 | { | |
1004 | struct jit_unwind_private *priv_data = cache; | |
1005 | struct gdbarch *frame_arch; | |
1006 | int i; | |
1007 | ||
1008 | gdb_assert (priv_data->registers); | |
1009 | frame_arch = get_frame_arch (priv_data->this_frame); | |
1010 | ||
1011 | for (i = 0; i < gdbarch_num_regs (frame_arch); i++) | |
1012 | if (priv_data->registers[i] && priv_data->registers[i]->free) | |
1013 | priv_data->registers[i]->free (priv_data->registers[i]); | |
1014 | ||
1015 | xfree (priv_data->registers); | |
1016 | xfree (priv_data); | |
1017 | } | |
1018 | ||
1019 | /* The frame sniffer for the pseudo unwinder. | |
1020 | ||
1021 | While this is nominally a frame sniffer, in the case where the JIT | |
1022 | reader actually recognizes the frame, it does a lot more work -- it | |
1023 | unwinds the frame and saves the corresponding register values in | |
1024 | the cache. jit_frame_prev_register simply returns the saved | |
1025 | register values. */ | |
1026 | ||
1027 | static int | |
1028 | jit_frame_sniffer (const struct frame_unwind *self, | |
1029 | struct frame_info *this_frame, void **cache) | |
1030 | { | |
1031 | struct jit_inferior_data *inf_data; | |
1032 | struct jit_unwind_private *priv_data; | |
1033 | struct jit_dbg_reader *iter; | |
1034 | struct gdb_unwind_callbacks callbacks; | |
1035 | struct gdb_reader_funcs *funcs; | |
1036 | ||
1037 | inf_data = get_jit_inferior_data (); | |
1038 | ||
1039 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1040 | callbacks.reg_set = jit_unwind_reg_set_impl; | |
1041 | callbacks.target_read = jit_target_read_impl; | |
1042 | ||
1043 | if (loaded_jit_reader == NULL) | |
1044 | return 0; | |
1045 | ||
1046 | funcs = loaded_jit_reader->functions; | |
1047 | ||
1048 | gdb_assert (!*cache); | |
1049 | ||
1050 | *cache = XZALLOC (struct jit_unwind_private); | |
1051 | priv_data = *cache; | |
1052 | priv_data->registers = | |
1053 | XCALLOC (gdbarch_num_regs (get_frame_arch (this_frame)), | |
1054 | struct gdb_reg_value *); | |
1055 | priv_data->this_frame = this_frame; | |
1056 | ||
1057 | callbacks.priv_data = priv_data; | |
1058 | ||
1059 | /* Try to coax the provided unwinder to unwind the stack */ | |
1060 | if (funcs->unwind (funcs, &callbacks) == GDB_SUCCESS) | |
1061 | { | |
1062 | if (jit_debug) | |
1063 | fprintf_unfiltered (gdb_stdlog, _("Successfully unwound frame using " | |
1064 | "JIT reader.\n")); | |
1065 | return 1; | |
1066 | } | |
1067 | if (jit_debug) | |
1068 | fprintf_unfiltered (gdb_stdlog, _("Could not unwind frame using " | |
1069 | "JIT reader.\n")); | |
1070 | ||
1071 | jit_dealloc_cache (this_frame, *cache); | |
1072 | *cache = NULL; | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | ||
1078 | /* The frame_id function for the pseudo unwinder. Relays the call to | |
1079 | the loaded plugin. */ | |
1080 | ||
1081 | static void | |
1082 | jit_frame_this_id (struct frame_info *this_frame, void **cache, | |
1083 | struct frame_id *this_id) | |
1084 | { | |
1085 | struct jit_unwind_private private; | |
1086 | struct gdb_frame_id frame_id; | |
1087 | struct gdb_reader_funcs *funcs; | |
1088 | struct gdb_unwind_callbacks callbacks; | |
1089 | ||
1090 | private.registers = NULL; | |
1091 | private.this_frame = this_frame; | |
1092 | ||
1093 | /* We don't expect the frame_id function to set any registers, so we | |
1094 | set reg_set to NULL. */ | |
1095 | callbacks.reg_get = jit_unwind_reg_get_impl; | |
1096 | callbacks.reg_set = NULL; | |
1097 | callbacks.target_read = jit_target_read_impl; | |
1098 | callbacks.priv_data = &private; | |
1099 | ||
1100 | gdb_assert (loaded_jit_reader); | |
1101 | funcs = loaded_jit_reader->functions; | |
1102 | ||
1103 | frame_id = funcs->get_frame_id (funcs, &callbacks); | |
1104 | *this_id = frame_id_build (frame_id.stack_address, frame_id.code_address); | |
1105 | } | |
1106 | ||
1107 | /* Pseudo unwinder function. Reads the previously fetched value for | |
1108 | the register from the cache. */ | |
1109 | ||
1110 | static struct value * | |
1111 | jit_frame_prev_register (struct frame_info *this_frame, void **cache, int reg) | |
1112 | { | |
1113 | struct jit_unwind_private *priv = *cache; | |
1114 | struct gdb_reg_value *value; | |
1115 | ||
1116 | if (priv == NULL) | |
1117 | return frame_unwind_got_optimized (this_frame, reg); | |
1118 | ||
1119 | gdb_assert (priv->registers); | |
1120 | value = priv->registers[reg]; | |
1121 | if (value && value->defined) | |
1122 | return frame_unwind_got_bytes (this_frame, reg, value->value); | |
1123 | else | |
1124 | return frame_unwind_got_optimized (this_frame, reg); | |
1125 | } | |
1126 | ||
1127 | /* Relay everything back to the unwinder registered by the JIT debug | |
1128 | info reader.*/ | |
1129 | ||
1130 | static const struct frame_unwind jit_frame_unwind = | |
1131 | { | |
1132 | NORMAL_FRAME, | |
1133 | default_frame_unwind_stop_reason, | |
1134 | jit_frame_this_id, | |
1135 | jit_frame_prev_register, | |
1136 | NULL, | |
1137 | jit_frame_sniffer, | |
1138 | jit_dealloc_cache | |
1139 | }; | |
1140 | ||
1141 | ||
1142 | /* This is the information that is stored at jit_gdbarch_data for each | |
1143 | architecture. */ | |
1144 | ||
1145 | struct jit_gdbarch_data_type | |
1146 | { | |
1147 | /* Has the (pseudo) unwinder been prepended? */ | |
1148 | int unwinder_registered; | |
1149 | }; | |
1150 | ||
1151 | /* Check GDBARCH and prepend the pseudo JIT unwinder if needed. */ | |
1152 | ||
1153 | static void | |
1154 | jit_prepend_unwinder (struct gdbarch *gdbarch) | |
1155 | { | |
1156 | struct jit_gdbarch_data_type *data; | |
1157 | ||
1158 | data = gdbarch_data (gdbarch, jit_gdbarch_data); | |
1159 | if (!data->unwinder_registered) | |
1160 | { | |
1161 | frame_unwind_prepend_unwinder (gdbarch, &jit_frame_unwind); | |
1162 | data->unwinder_registered = 1; | |
1163 | } | |
1164 | } | |
1165 | ||
03673fc7 | 1166 | /* Register any already created translations. */ |
0756c555 DE |
1167 | |
1168 | static void | |
1169 | jit_inferior_init (struct gdbarch *gdbarch) | |
4efc6507 | 1170 | { |
4efc6507 DE |
1171 | struct jit_descriptor descriptor; |
1172 | struct jit_code_entry cur_entry; | |
03673fc7 | 1173 | struct jit_inferior_data *inf_data; |
4efc6507 | 1174 | CORE_ADDR cur_entry_addr; |
4efc6507 | 1175 | |
a255712f | 1176 | if (jit_debug) |
03673fc7 | 1177 | fprintf_unfiltered (gdb_stdlog, "jit_inferior_init\n"); |
a255712f | 1178 | |
3623dc3a SD |
1179 | jit_prepend_unwinder (gdbarch); |
1180 | ||
03673fc7 PP |
1181 | inf_data = get_jit_inferior_data (); |
1182 | if (jit_breakpoint_re_set_internal (gdbarch, inf_data) != 0) | |
4efc6507 DE |
1183 | return; |
1184 | ||
03673fc7 PP |
1185 | if (inf_data->descriptor_addr == 0) |
1186 | { | |
1187 | struct minimal_symbol *desc_symbol; | |
4efc6507 | 1188 | |
03673fc7 PP |
1189 | /* Lookup the descriptor symbol and cache the addr. If it is |
1190 | missing, we assume we are not attached to a JIT and return early. */ | |
1191 | desc_symbol = lookup_minimal_symbol (jit_descriptor_name, NULL, NULL); | |
1192 | if (desc_symbol == NULL) | |
1193 | return; | |
a255712f | 1194 | |
03673fc7 PP |
1195 | inf_data->descriptor_addr = SYMBOL_VALUE_ADDRESS (desc_symbol); |
1196 | if (inf_data->descriptor_addr == 0) | |
1197 | return; | |
1198 | } | |
4efc6507 | 1199 | |
a255712f PP |
1200 | if (jit_debug) |
1201 | fprintf_unfiltered (gdb_stdlog, | |
03673fc7 PP |
1202 | "jit_inferior_init, descriptor_addr = %s\n", |
1203 | paddress (gdbarch, inf_data->descriptor_addr)); | |
a255712f | 1204 | |
1777feb0 MS |
1205 | /* Read the descriptor so we can check the version number and load |
1206 | any already JITed functions. */ | |
03673fc7 | 1207 | jit_read_descriptor (gdbarch, &descriptor, inf_data->descriptor_addr); |
4efc6507 DE |
1208 | |
1209 | /* Check that the version number agrees with that we support. */ | |
1210 | if (descriptor.version != 1) | |
1211 | error (_("Unsupported JIT protocol version in descriptor!")); | |
1212 | ||
1777feb0 MS |
1213 | /* If we've attached to a running program, we need to check the descriptor |
1214 | to register any functions that were already generated. */ | |
4efc6507 DE |
1215 | for (cur_entry_addr = descriptor.first_entry; |
1216 | cur_entry_addr != 0; | |
1217 | cur_entry_addr = cur_entry.next_entry) | |
1218 | { | |
0756c555 | 1219 | jit_read_code_entry (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1220 | |
1221 | /* This hook may be called many times during setup, so make sure we don't | |
1222 | add the same symbol file twice. */ | |
1223 | if (jit_find_objf_with_entry_addr (cur_entry_addr) != NULL) | |
1224 | continue; | |
1225 | ||
0756c555 | 1226 | jit_register_code (gdbarch, cur_entry_addr, &cur_entry); |
4efc6507 DE |
1227 | } |
1228 | } | |
1229 | ||
0756c555 DE |
1230 | /* Exported routine to call when an inferior has been created. */ |
1231 | ||
1232 | void | |
1233 | jit_inferior_created_hook (void) | |
1234 | { | |
1235 | jit_inferior_init (target_gdbarch); | |
1236 | } | |
1237 | ||
1238 | /* Exported routine to call to re-set the jit breakpoints, | |
1239 | e.g. when a program is rerun. */ | |
1240 | ||
1241 | void | |
1242 | jit_breakpoint_re_set (void) | |
1243 | { | |
03673fc7 PP |
1244 | jit_breakpoint_re_set_internal (target_gdbarch, |
1245 | get_jit_inferior_data ()); | |
1246 | } | |
1247 | ||
1248 | /* Reset inferior_data, so sybols will be looked up again, and jit_breakpoint | |
1249 | will be reset. */ | |
1250 | ||
1251 | static void | |
1252 | jit_reset_inferior_data_and_breakpoints (void) | |
1253 | { | |
1254 | struct jit_inferior_data *inf_data; | |
1255 | ||
1256 | /* Force jit_inferior_init to re-lookup of jit symbol addresses. */ | |
1257 | inf_data = get_jit_inferior_data (); | |
1258 | inf_data->breakpoint_addr = 0; | |
1259 | inf_data->descriptor_addr = 0; | |
1260 | ||
1261 | /* Remove any existing JIT breakpoint(s). */ | |
1262 | remove_jit_event_breakpoints (); | |
1263 | ||
0756c555 DE |
1264 | jit_inferior_init (target_gdbarch); |
1265 | } | |
1266 | ||
4efc6507 DE |
1267 | /* Wrapper to match the observer function pointer prototype. */ |
1268 | ||
1269 | static void | |
0756c555 | 1270 | jit_inferior_created_observer (struct target_ops *objfile, int from_tty) |
4efc6507 | 1271 | { |
03673fc7 | 1272 | jit_reset_inferior_data_and_breakpoints (); |
4efc6507 DE |
1273 | } |
1274 | ||
1777feb0 MS |
1275 | /* This function cleans up any code entries left over when the |
1276 | inferior exits. We get left over code when the inferior exits | |
1277 | without unregistering its code, for example when it crashes. */ | |
4efc6507 DE |
1278 | |
1279 | static void | |
a79b8f6e | 1280 | jit_inferior_exit_hook (struct inferior *inf) |
4efc6507 DE |
1281 | { |
1282 | struct objfile *objf; | |
1283 | struct objfile *temp; | |
1284 | ||
4efc6507 DE |
1285 | ALL_OBJFILES_SAFE (objf, temp) |
1286 | if (objfile_data (objf, jit_objfile_data) != NULL) | |
1287 | jit_unregister_code (objf); | |
1288 | } | |
1289 | ||
03673fc7 PP |
1290 | static void |
1291 | jit_executable_changed_observer (void) | |
1292 | { | |
1293 | jit_reset_inferior_data_and_breakpoints (); | |
1294 | } | |
1295 | ||
4efc6507 | 1296 | void |
0756c555 | 1297 | jit_event_handler (struct gdbarch *gdbarch) |
4efc6507 DE |
1298 | { |
1299 | struct jit_descriptor descriptor; | |
1300 | struct jit_code_entry code_entry; | |
1301 | CORE_ADDR entry_addr; | |
1302 | struct objfile *objf; | |
1303 | ||
1304 | /* Read the descriptor from remote memory. */ | |
03673fc7 PP |
1305 | jit_read_descriptor (gdbarch, &descriptor, |
1306 | get_jit_inferior_data ()->descriptor_addr); | |
4efc6507 DE |
1307 | entry_addr = descriptor.relevant_entry; |
1308 | ||
1777feb0 | 1309 | /* Do the corresponding action. */ |
4efc6507 DE |
1310 | switch (descriptor.action_flag) |
1311 | { | |
1312 | case JIT_NOACTION: | |
1313 | break; | |
1314 | case JIT_REGISTER: | |
0756c555 DE |
1315 | jit_read_code_entry (gdbarch, entry_addr, &code_entry); |
1316 | jit_register_code (gdbarch, entry_addr, &code_entry); | |
4efc6507 DE |
1317 | break; |
1318 | case JIT_UNREGISTER: | |
1319 | objf = jit_find_objf_with_entry_addr (entry_addr); | |
1320 | if (objf == NULL) | |
1777feb0 MS |
1321 | printf_unfiltered (_("Unable to find JITed code " |
1322 | "entry at address: %s\n"), | |
dfdbc9b4 | 1323 | paddress (gdbarch, entry_addr)); |
4efc6507 DE |
1324 | else |
1325 | jit_unregister_code (objf); | |
1326 | ||
1327 | break; | |
1328 | default: | |
1329 | error (_("Unknown action_flag value in JIT descriptor!")); | |
1330 | break; | |
1331 | } | |
1332 | } | |
1333 | ||
1825a88d SD |
1334 | /* Called to free the data allocated to the jit_inferior_data slot. */ |
1335 | ||
1336 | static void | |
1337 | free_objfile_data (struct objfile *objfile, void *data) | |
1338 | { | |
1339 | xfree (data); | |
1340 | } | |
1341 | ||
3623dc3a SD |
1342 | /* Initialize the jit_gdbarch_data slot with an instance of struct |
1343 | jit_gdbarch_data_type */ | |
1344 | ||
1345 | static void * | |
1346 | jit_gdbarch_data_init (struct obstack *obstack) | |
1347 | { | |
1348 | struct jit_gdbarch_data_type *data; | |
1349 | ||
1350 | data = obstack_alloc (obstack, sizeof (struct jit_gdbarch_data_type)); | |
1351 | data->unwinder_registered = 0; | |
1352 | return data; | |
1353 | } | |
1354 | ||
4efc6507 DE |
1355 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1356 | ||
1357 | extern void _initialize_jit (void); | |
1358 | ||
1359 | void | |
1360 | _initialize_jit (void) | |
1361 | { | |
b8e0a31c SD |
1362 | jit_reader_dir = relocate_gdb_directory (JIT_READER_DIR, |
1363 | JIT_READER_DIR_RELOCATABLE); | |
1777feb0 MS |
1364 | add_setshow_zinteger_cmd ("jit", class_maintenance, &jit_debug, |
1365 | _("Set JIT debugging."), | |
1366 | _("Show JIT debugging."), | |
1367 | _("When non-zero, JIT debugging is enabled."), | |
a255712f PP |
1368 | NULL, |
1369 | show_jit_debug, | |
1370 | &setdebuglist, &showdebuglist); | |
1371 | ||
0756c555 | 1372 | observer_attach_inferior_created (jit_inferior_created_observer); |
4efc6507 | 1373 | observer_attach_inferior_exit (jit_inferior_exit_hook); |
03673fc7 | 1374 | observer_attach_executable_changed (jit_executable_changed_observer); |
1825a88d SD |
1375 | jit_objfile_data = |
1376 | register_objfile_data_with_cleanup (NULL, free_objfile_data); | |
03673fc7 PP |
1377 | jit_inferior_data = |
1378 | register_inferior_data_with_cleanup (jit_inferior_data_cleanup); | |
3623dc3a | 1379 | jit_gdbarch_data = gdbarch_data_register_pre_init (jit_gdbarch_data_init); |
784c47ee SD |
1380 | if (is_dl_available ()) |
1381 | { | |
1382 | add_com ("jit-reader-load", no_class, jit_reader_load_command, _("\ | |
1383 | Load FILE as debug info reader and unwinder for JIT compiled code.\n\ | |
1384 | Usage: jit-reader-load FILE\n\ | |
1385 | Try to load file FILE as a debug info reader (and unwinder) for\n\ | |
1386 | JIT compiled code. The file is loaded from " JIT_READER_DIR ",\n\ | |
1387 | relocated relative to the GDB executable if required.")); | |
1388 | add_com ("jit-reader-unload", no_class, jit_reader_unload_command, _("\ | |
1389 | Unload the currently loaded JIT debug info reader.\n\ | |
1390 | Usage: jit-reader-unload FILE\n\n\ | |
1391 | Do \"help jit-reader-load\" for info on loading debug info readers.")); | |
1392 | } | |
4efc6507 | 1393 | } |