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