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