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1 | /* Darwin support for GDB, the GNU debugger. | |
2 | Copyright (C) 2008-2020 Free Software Foundation, Inc. | |
3 | ||
4 | Contributed by AdaCore. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "defs.h" | |
22 | #include "top.h" | |
23 | #include "inferior.h" | |
24 | #include "target.h" | |
25 | #include "symfile.h" | |
26 | #include "symtab.h" | |
27 | #include "objfiles.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "gdbcore.h" | |
30 | #include "gdbthread.h" | |
31 | #include "regcache.h" | |
32 | #include "event-top.h" | |
33 | #include "inf-loop.h" | |
34 | #include <sys/stat.h> | |
35 | #include "inf-child.h" | |
36 | #include "value.h" | |
37 | #include "arch-utils.h" | |
38 | #include "bfd.h" | |
39 | #include "bfd/mach-o.h" | |
40 | #include "gdbarch.h" | |
41 | ||
42 | #include <copyfile.h> | |
43 | #include <sys/ptrace.h> | |
44 | #include <sys/signal.h> | |
45 | #include <setjmp.h> | |
46 | #include <sys/types.h> | |
47 | #include <unistd.h> | |
48 | #include <signal.h> | |
49 | #include <ctype.h> | |
50 | #include <sys/sysctl.h> | |
51 | #include <sys/proc.h> | |
52 | #include <libproc.h> | |
53 | #include <sys/syscall.h> | |
54 | #include <spawn.h> | |
55 | ||
56 | #include <mach/mach_error.h> | |
57 | #include <mach/mach_vm.h> | |
58 | #include <mach/mach_init.h> | |
59 | #include <mach/vm_map.h> | |
60 | #include <mach/task.h> | |
61 | #include <mach/mach_port.h> | |
62 | #include <mach/thread_act.h> | |
63 | #include <mach/port.h> | |
64 | ||
65 | #include "darwin-nat.h" | |
66 | #include "filenames.h" | |
67 | #include "gdbsupport/filestuff.h" | |
68 | #include "gdbsupport/gdb_unlinker.h" | |
69 | #include "gdbsupport/pathstuff.h" | |
70 | #include "gdbsupport/scoped_fd.h" | |
71 | #include "nat/fork-inferior.h" | |
72 | ||
73 | /* Quick overview. | |
74 | Darwin kernel is Mach + BSD derived kernel. Note that they share the | |
75 | same memory space and are linked together (ie there is no micro-kernel). | |
76 | ||
77 | Although ptrace(2) is available on Darwin, it is not complete. We have | |
78 | to use Mach calls to read and write memory and to modify registers. We | |
79 | also use Mach to get inferior faults. As we cannot use select(2) or | |
80 | signals with Mach port (the Mach communication channel), signals are | |
81 | reported to gdb as an exception. Furthermore we detect death of the | |
82 | inferior through a Mach notification message. This way we only wait | |
83 | on Mach ports. | |
84 | ||
85 | Some Mach documentation is available for Apple xnu source package or | |
86 | from the web. */ | |
87 | ||
88 | ||
89 | #define PTRACE(CMD, PID, ADDR, SIG) \ | |
90 | darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG)) | |
91 | ||
92 | static void darwin_ptrace_me (void); | |
93 | ||
94 | static void darwin_encode_reply (mig_reply_error_t *reply, | |
95 | mach_msg_header_t *hdr, integer_t code); | |
96 | ||
97 | static void darwin_setup_request_notification (struct inferior *inf); | |
98 | static void darwin_deallocate_exception_ports (darwin_inferior *inf); | |
99 | static void darwin_setup_exceptions (struct inferior *inf); | |
100 | static void darwin_deallocate_threads (struct inferior *inf); | |
101 | ||
102 | /* Task identifier of gdb. */ | |
103 | static task_t gdb_task; | |
104 | ||
105 | /* A copy of mach_host_self (). */ | |
106 | mach_port_t darwin_host_self; | |
107 | ||
108 | /* Exception port. */ | |
109 | mach_port_t darwin_ex_port; | |
110 | ||
111 | /* Port set, to wait for answer on all ports. */ | |
112 | mach_port_t darwin_port_set; | |
113 | ||
114 | /* Page size. */ | |
115 | static vm_size_t mach_page_size; | |
116 | ||
117 | /* If Set, catch all mach exceptions (before they are converted to signals | |
118 | by the kernel). */ | |
119 | static bool enable_mach_exceptions; | |
120 | ||
121 | /* Inferior that should report a fake stop event. */ | |
122 | static struct inferior *darwin_inf_fake_stop; | |
123 | ||
124 | /* If non-NULL, the shell we actually invoke. See maybe_cache_shell | |
125 | for details. */ | |
126 | static const char *copied_shell; | |
127 | ||
128 | #define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1)) | |
129 | #define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1) | |
130 | ||
131 | /* This controls output of inferior debugging. */ | |
132 | static unsigned int darwin_debug_flag = 0; | |
133 | ||
134 | /* Create a __TEXT __info_plist section in the executable so that gdb could | |
135 | be signed. This is required to get an authorization for task_for_pid. | |
136 | ||
137 | Once gdb is built, you must codesign it with any system-trusted signing | |
138 | authority. See taskgated(8) for details. */ | |
139 | static const unsigned char info_plist[] | |
140 | __attribute__ ((section ("__TEXT,__info_plist"),used)) = | |
141 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" | |
142 | "<!DOCTYPE plist PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\"" | |
143 | " \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n" | |
144 | "<plist version=\"1.0\">\n" | |
145 | "<dict>\n" | |
146 | " <key>CFBundleIdentifier</key>\n" | |
147 | " <string>org.gnu.gdb</string>\n" | |
148 | " <key>CFBundleName</key>\n" | |
149 | " <string>gdb</string>\n" | |
150 | " <key>CFBundleVersion</key>\n" | |
151 | " <string>1.0</string>\n" | |
152 | " <key>SecTaskAccess</key>\n" | |
153 | " <array>\n" | |
154 | " <string>allowed</string>\n" | |
155 | " <string>debug</string>\n" | |
156 | " </array>\n" | |
157 | "</dict>\n" | |
158 | "</plist>\n"; | |
159 | ||
160 | static void inferior_debug (int level, const char *fmt, ...) | |
161 | ATTRIBUTE_PRINTF (2, 3); | |
162 | ||
163 | static void | |
164 | inferior_debug (int level, const char *fmt, ...) | |
165 | { | |
166 | va_list ap; | |
167 | ||
168 | if (darwin_debug_flag < level) | |
169 | return; | |
170 | ||
171 | va_start (ap, fmt); | |
172 | printf_unfiltered (_("[%d inferior]: "), getpid ()); | |
173 | vprintf_unfiltered (fmt, ap); | |
174 | va_end (ap); | |
175 | } | |
176 | ||
177 | void | |
178 | mach_check_error (kern_return_t ret, const char *file, | |
179 | unsigned int line, const char *func) | |
180 | { | |
181 | if (ret == KERN_SUCCESS) | |
182 | return; | |
183 | if (func == NULL) | |
184 | func = _("[UNKNOWN]"); | |
185 | ||
186 | warning (_("Mach error at \"%s:%u\" in function \"%s\": %s (0x%lx)"), | |
187 | file, line, func, mach_error_string (ret), (unsigned long) ret); | |
188 | } | |
189 | ||
190 | static const char * | |
191 | unparse_exception_type (unsigned int i) | |
192 | { | |
193 | static char unknown_exception_buf[32]; | |
194 | ||
195 | switch (i) | |
196 | { | |
197 | case EXC_BAD_ACCESS: | |
198 | return "EXC_BAD_ACCESS"; | |
199 | case EXC_BAD_INSTRUCTION: | |
200 | return "EXC_BAD_INSTRUCTION"; | |
201 | case EXC_ARITHMETIC: | |
202 | return "EXC_ARITHMETIC"; | |
203 | case EXC_EMULATION: | |
204 | return "EXC_EMULATION"; | |
205 | case EXC_SOFTWARE: | |
206 | return "EXC_SOFTWARE"; | |
207 | case EXC_BREAKPOINT: | |
208 | return "EXC_BREAKPOINT"; | |
209 | case EXC_SYSCALL: | |
210 | return "EXC_SYSCALL"; | |
211 | case EXC_MACH_SYSCALL: | |
212 | return "EXC_MACH_SYSCALL"; | |
213 | case EXC_RPC_ALERT: | |
214 | return "EXC_RPC_ALERT"; | |
215 | case EXC_CRASH: | |
216 | return "EXC_CRASH"; | |
217 | default: | |
218 | snprintf (unknown_exception_buf, 32, _("unknown (%d)"), i); | |
219 | return unknown_exception_buf; | |
220 | } | |
221 | } | |
222 | ||
223 | /* Set errno to zero, and then call ptrace with the given arguments. | |
224 | If inferior debugging traces are on, then also print a debug | |
225 | trace. | |
226 | ||
227 | The returned value is the same as the value returned by ptrace, | |
228 | except in the case where that value is -1 but errno is zero. | |
229 | This case is documented to be a non-error situation, so we | |
230 | return zero in that case. */ | |
231 | ||
232 | static int | |
233 | darwin_ptrace (const char *name, | |
234 | int request, int pid, caddr_t arg3, int arg4) | |
235 | { | |
236 | int ret; | |
237 | ||
238 | errno = 0; | |
239 | ret = ptrace (request, pid, arg3, arg4); | |
240 | if (ret == -1 && errno == 0) | |
241 | ret = 0; | |
242 | ||
243 | inferior_debug (4, _("ptrace (%s, %d, 0x%lx, %d): %d (%s)\n"), | |
244 | name, pid, (unsigned long) arg3, arg4, ret, | |
245 | (ret != 0) ? safe_strerror (errno) : _("no error")); | |
246 | return ret; | |
247 | } | |
248 | ||
249 | static int | |
250 | cmp_thread_t (const void *l, const void *r) | |
251 | { | |
252 | thread_t tl = *(const thread_t *)l; | |
253 | thread_t tr = *(const thread_t *)r; | |
254 | return (int)(tl - tr); | |
255 | } | |
256 | ||
257 | void | |
258 | darwin_nat_target::check_new_threads (inferior *inf) | |
259 | { | |
260 | kern_return_t kret; | |
261 | thread_array_t thread_list; | |
262 | unsigned int new_nbr; | |
263 | unsigned int old_nbr; | |
264 | unsigned int new_ix, old_ix; | |
265 | darwin_inferior *darwin_inf = get_darwin_inferior (inf); | |
266 | std::vector<darwin_thread_t *> new_thread_vec; | |
267 | ||
268 | if (darwin_inf == nullptr) | |
269 | return; | |
270 | ||
271 | /* Get list of threads. */ | |
272 | kret = task_threads (darwin_inf->task, &thread_list, &new_nbr); | |
273 | MACH_CHECK_ERROR (kret); | |
274 | if (kret != KERN_SUCCESS) | |
275 | return; | |
276 | ||
277 | /* Sort the list. */ | |
278 | if (new_nbr > 1) | |
279 | qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t); | |
280 | ||
281 | old_nbr = darwin_inf->threads.size (); | |
282 | ||
283 | /* Quick check for no changes. */ | |
284 | if (old_nbr == new_nbr) | |
285 | { | |
286 | size_t i; | |
287 | ||
288 | for (i = 0; i < new_nbr; i++) | |
289 | if (thread_list[i] != darwin_inf->threads[i]->gdb_port) | |
290 | break; | |
291 | if (i == new_nbr) | |
292 | { | |
293 | /* Deallocate ports. */ | |
294 | for (i = 0; i < new_nbr; i++) | |
295 | { | |
296 | kret = mach_port_deallocate (mach_task_self (), thread_list[i]); | |
297 | MACH_CHECK_ERROR (kret); | |
298 | } | |
299 | ||
300 | /* Deallocate the buffer. */ | |
301 | kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, | |
302 | new_nbr * sizeof (int)); | |
303 | MACH_CHECK_ERROR (kret); | |
304 | ||
305 | return; | |
306 | } | |
307 | } | |
308 | ||
309 | /* Full handling: detect new threads, remove dead threads. */ | |
310 | ||
311 | new_thread_vec.reserve (new_nbr); | |
312 | ||
313 | for (new_ix = 0, old_ix = 0; new_ix < new_nbr || old_ix < old_nbr;) | |
314 | { | |
315 | thread_t new_id = (new_ix < new_nbr) ? thread_list[new_ix] : THREAD_NULL; | |
316 | darwin_thread_t *old | |
317 | = (old_ix < old_nbr) ? darwin_inf->threads[old_ix] : NULL; | |
318 | thread_t old_id = old != NULL ? old->gdb_port : THREAD_NULL; | |
319 | ||
320 | inferior_debug | |
321 | (12, _(" new_ix:%d/%d, old_ix:%d/%d, new_id:0x%x old_id:0x%x\n"), | |
322 | new_ix, new_nbr, old_ix, old_nbr, new_id, old_id); | |
323 | ||
324 | if (old_id == new_id) | |
325 | { | |
326 | /* Thread still exist. */ | |
327 | new_thread_vec.push_back (old); | |
328 | new_ix++; | |
329 | old_ix++; | |
330 | ||
331 | /* Deallocate the port. */ | |
332 | kret = mach_port_deallocate (gdb_task, new_id); | |
333 | MACH_CHECK_ERROR (kret); | |
334 | ||
335 | continue; | |
336 | } | |
337 | if (new_ix < new_nbr && new_id == MACH_PORT_DEAD) | |
338 | { | |
339 | /* Ignore dead ports. | |
340 | In some weird cases, we might get dead ports. They should | |
341 | correspond to dead thread so they could safely be ignored. */ | |
342 | new_ix++; | |
343 | continue; | |
344 | } | |
345 | if (new_ix < new_nbr && (old_ix == old_nbr || new_id < old_id)) | |
346 | { | |
347 | /* A thread was created. */ | |
348 | darwin_thread_info *pti = new darwin_thread_info; | |
349 | ||
350 | pti->gdb_port = new_id; | |
351 | pti->msg_state = DARWIN_RUNNING; | |
352 | ||
353 | /* Add the new thread. */ | |
354 | add_thread_with_info (this, ptid_t (inf->pid, 0, new_id), pti); | |
355 | new_thread_vec.push_back (pti); | |
356 | new_ix++; | |
357 | continue; | |
358 | } | |
359 | if (old_ix < old_nbr && (new_ix == new_nbr || new_id > old_id)) | |
360 | { | |
361 | /* A thread was removed. */ | |
362 | struct thread_info *thr | |
363 | = find_thread_ptid (this, ptid_t (inf->pid, 0, old_id)); | |
364 | delete_thread (thr); | |
365 | kret = mach_port_deallocate (gdb_task, old_id); | |
366 | MACH_CHECK_ERROR (kret); | |
367 | old_ix++; | |
368 | continue; | |
369 | } | |
370 | gdb_assert_not_reached ("unexpected thread case"); | |
371 | } | |
372 | ||
373 | darwin_inf->threads = std::move (new_thread_vec); | |
374 | ||
375 | /* Deallocate the buffer. */ | |
376 | kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, | |
377 | new_nbr * sizeof (int)); | |
378 | MACH_CHECK_ERROR (kret); | |
379 | } | |
380 | ||
381 | static int | |
382 | find_inferior_task_it (struct inferior *inf, void *port_ptr) | |
383 | { | |
384 | darwin_inferior *priv = get_darwin_inferior (inf); | |
385 | ||
386 | return priv != nullptr && priv->task == *(task_t *)port_ptr; | |
387 | } | |
388 | ||
389 | static int | |
390 | find_inferior_pid_it (struct inferior *inf, void *pid_ptr) | |
391 | { | |
392 | return inf->pid == *(int *)pid_ptr; | |
393 | } | |
394 | ||
395 | /* Return an inferior by task port. */ | |
396 | static struct inferior * | |
397 | darwin_find_inferior_by_task (task_t port) | |
398 | { | |
399 | return iterate_over_inferiors (&find_inferior_task_it, &port); | |
400 | } | |
401 | ||
402 | /* Return an inferior by pid port. */ | |
403 | static struct inferior * | |
404 | darwin_find_inferior_by_pid (int pid) | |
405 | { | |
406 | return iterate_over_inferiors (&find_inferior_pid_it, &pid); | |
407 | } | |
408 | ||
409 | /* Return a thread by port. */ | |
410 | static darwin_thread_t * | |
411 | darwin_find_thread (struct inferior *inf, thread_t thread) | |
412 | { | |
413 | darwin_inferior *priv = get_darwin_inferior (inf); | |
414 | ||
415 | if (priv != nullptr) | |
416 | for (darwin_thread_t *t : priv->threads) | |
417 | { | |
418 | if (t->gdb_port == thread) | |
419 | return t; | |
420 | } | |
421 | ||
422 | return NULL; | |
423 | } | |
424 | ||
425 | /* Suspend (ie stop) an inferior at Mach level. */ | |
426 | ||
427 | static void | |
428 | darwin_suspend_inferior (struct inferior *inf) | |
429 | { | |
430 | darwin_inferior *priv = get_darwin_inferior (inf); | |
431 | ||
432 | if (priv != nullptr && !priv->suspended) | |
433 | { | |
434 | kern_return_t kret; | |
435 | ||
436 | kret = task_suspend (priv->task); | |
437 | MACH_CHECK_ERROR (kret); | |
438 | ||
439 | priv->suspended = 1; | |
440 | } | |
441 | } | |
442 | ||
443 | /* Resume an inferior at Mach level. */ | |
444 | ||
445 | static void | |
446 | darwin_resume_inferior (struct inferior *inf) | |
447 | { | |
448 | darwin_inferior *priv = get_darwin_inferior (inf); | |
449 | ||
450 | if (priv != nullptr && priv->suspended) | |
451 | { | |
452 | kern_return_t kret; | |
453 | ||
454 | kret = task_resume (priv->task); | |
455 | MACH_CHECK_ERROR (kret); | |
456 | ||
457 | priv->suspended = 0; | |
458 | } | |
459 | } | |
460 | ||
461 | /* Iterator functions. */ | |
462 | ||
463 | static int | |
464 | darwin_resume_inferior_it (struct inferior *inf, void *arg) | |
465 | { | |
466 | darwin_resume_inferior (inf); | |
467 | return 0; | |
468 | } | |
469 | ||
470 | static void | |
471 | darwin_dump_message (mach_msg_header_t *hdr, int disp_body) | |
472 | { | |
473 | printf_unfiltered (_("message header:\n")); | |
474 | printf_unfiltered (_(" bits: 0x%x\n"), hdr->msgh_bits); | |
475 | printf_unfiltered (_(" size: 0x%x\n"), hdr->msgh_size); | |
476 | printf_unfiltered (_(" remote-port: 0x%x\n"), hdr->msgh_remote_port); | |
477 | printf_unfiltered (_(" local-port: 0x%x\n"), hdr->msgh_local_port); | |
478 | printf_unfiltered (_(" reserved: 0x%x\n"), hdr->msgh_reserved); | |
479 | printf_unfiltered (_(" id: 0x%x\n"), hdr->msgh_id); | |
480 | ||
481 | if (disp_body) | |
482 | { | |
483 | const unsigned char *data; | |
484 | const unsigned int *ldata; | |
485 | int size; | |
486 | int i; | |
487 | ||
488 | data = (unsigned char *)(hdr + 1); | |
489 | size = hdr->msgh_size - sizeof (mach_msg_header_t); | |
490 | ||
491 | if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX) | |
492 | { | |
493 | mach_msg_body_t *bod = (mach_msg_body_t*)data; | |
494 | mach_msg_port_descriptor_t *desc = | |
495 | (mach_msg_port_descriptor_t *)(bod + 1); | |
496 | int k; | |
497 | NDR_record_t *ndr; | |
498 | printf_unfiltered (_("body: descriptor_count=%u\n"), | |
499 | bod->msgh_descriptor_count); | |
500 | data += sizeof (mach_msg_body_t); | |
501 | size -= sizeof (mach_msg_body_t); | |
502 | for (k = 0; k < bod->msgh_descriptor_count; k++) | |
503 | switch (desc[k].type) | |
504 | { | |
505 | case MACH_MSG_PORT_DESCRIPTOR: | |
506 | printf_unfiltered | |
507 | (_(" descr %d: type=%u (port) name=0x%x, dispo=%d\n"), | |
508 | k, desc[k].type, desc[k].name, desc[k].disposition); | |
509 | break; | |
510 | default: | |
511 | printf_unfiltered (_(" descr %d: type=%u\n"), | |
512 | k, desc[k].type); | |
513 | break; | |
514 | } | |
515 | data += bod->msgh_descriptor_count | |
516 | * sizeof (mach_msg_port_descriptor_t); | |
517 | size -= bod->msgh_descriptor_count | |
518 | * sizeof (mach_msg_port_descriptor_t); | |
519 | ndr = (NDR_record_t *)(desc + bod->msgh_descriptor_count); | |
520 | printf_unfiltered | |
521 | (_("NDR: mig=%02x if=%02x encod=%02x " | |
522 | "int=%02x char=%02x float=%02x\n"), | |
523 | ndr->mig_vers, ndr->if_vers, ndr->mig_encoding, | |
524 | ndr->int_rep, ndr->char_rep, ndr->float_rep); | |
525 | data += sizeof (NDR_record_t); | |
526 | size -= sizeof (NDR_record_t); | |
527 | } | |
528 | ||
529 | printf_unfiltered (_(" data:")); | |
530 | ldata = (const unsigned int *)data; | |
531 | for (i = 0; i < size / sizeof (unsigned int); i++) | |
532 | printf_unfiltered (" %08x", ldata[i]); | |
533 | printf_unfiltered (_("\n")); | |
534 | } | |
535 | } | |
536 | ||
537 | /* Adjust inferior data when a new task was created. */ | |
538 | ||
539 | static struct inferior * | |
540 | darwin_find_new_inferior (task_t task_port, thread_t thread_port) | |
541 | { | |
542 | int task_pid; | |
543 | struct inferior *inf; | |
544 | kern_return_t kret; | |
545 | mach_port_t prev; | |
546 | ||
547 | /* Find the corresponding pid. */ | |
548 | kret = pid_for_task (task_port, &task_pid); | |
549 | if (kret != KERN_SUCCESS) | |
550 | { | |
551 | MACH_CHECK_ERROR (kret); | |
552 | return NULL; | |
553 | } | |
554 | ||
555 | /* Find the inferior for this pid. */ | |
556 | inf = darwin_find_inferior_by_pid (task_pid); | |
557 | if (inf == NULL) | |
558 | return NULL; | |
559 | ||
560 | darwin_inferior *priv = get_darwin_inferior (inf); | |
561 | ||
562 | /* Deallocate saved exception ports. */ | |
563 | darwin_deallocate_exception_ports (priv); | |
564 | ||
565 | /* No need to remove dead_name notification, but still... */ | |
566 | kret = mach_port_request_notification (gdb_task, priv->task, | |
567 | MACH_NOTIFY_DEAD_NAME, 0, | |
568 | MACH_PORT_NULL, | |
569 | MACH_MSG_TYPE_MAKE_SEND_ONCE, | |
570 | &prev); | |
571 | if (kret != KERN_INVALID_ARGUMENT) | |
572 | MACH_CHECK_ERROR (kret); | |
573 | ||
574 | /* Replace old task port. */ | |
575 | kret = mach_port_deallocate (gdb_task, priv->task); | |
576 | MACH_CHECK_ERROR (kret); | |
577 | priv->task = task_port; | |
578 | ||
579 | darwin_setup_request_notification (inf); | |
580 | darwin_setup_exceptions (inf); | |
581 | ||
582 | return inf; | |
583 | } | |
584 | ||
585 | /* Check data representation. */ | |
586 | ||
587 | static int | |
588 | darwin_check_message_ndr (NDR_record_t *ndr) | |
589 | { | |
590 | if (ndr->mig_vers != NDR_PROTOCOL_2_0 | |
591 | || ndr->if_vers != NDR_PROTOCOL_2_0 | |
592 | || ndr->mig_encoding != NDR_record.mig_encoding | |
593 | || ndr->int_rep != NDR_record.int_rep | |
594 | || ndr->char_rep != NDR_record.char_rep | |
595 | || ndr->float_rep != NDR_record.float_rep) | |
596 | return -1; | |
597 | return 0; | |
598 | } | |
599 | ||
600 | /* Decode an exception message. */ | |
601 | ||
602 | int | |
603 | darwin_nat_target::decode_exception_message (mach_msg_header_t *hdr, | |
604 | inferior **pinf, | |
605 | darwin_thread_t **pthread) | |
606 | { | |
607 | mach_msg_body_t *bod = (mach_msg_body_t*)(hdr + 1); | |
608 | mach_msg_port_descriptor_t *desc = (mach_msg_port_descriptor_t *)(bod + 1); | |
609 | NDR_record_t *ndr; | |
610 | integer_t *data; | |
611 | struct inferior *inf; | |
612 | darwin_thread_t *thread; | |
613 | task_t task_port; | |
614 | thread_t thread_port; | |
615 | kern_return_t kret; | |
616 | int i; | |
617 | ||
618 | /* Check message destination. */ | |
619 | if (hdr->msgh_local_port != darwin_ex_port) | |
620 | return -1; | |
621 | ||
622 | /* Check message header. */ | |
623 | if (!(hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)) | |
624 | return -1; | |
625 | ||
626 | /* Check descriptors. */ | |
627 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc) | |
628 | + sizeof (*ndr) + 2 * sizeof (integer_t)) | |
629 | || bod->msgh_descriptor_count != 2 | |
630 | || desc[0].type != MACH_MSG_PORT_DESCRIPTOR | |
631 | || desc[0].disposition != MACH_MSG_TYPE_MOVE_SEND | |
632 | || desc[1].type != MACH_MSG_PORT_DESCRIPTOR | |
633 | || desc[1].disposition != MACH_MSG_TYPE_MOVE_SEND) | |
634 | return -1; | |
635 | ||
636 | /* Check data representation. */ | |
637 | ndr = (NDR_record_t *)(desc + 2); | |
638 | if (darwin_check_message_ndr (ndr) != 0) | |
639 | return -1; | |
640 | ||
641 | /* Ok, the hard work. */ | |
642 | data = (integer_t *)(ndr + 1); | |
643 | ||
644 | task_port = desc[1].name; | |
645 | thread_port = desc[0].name; | |
646 | ||
647 | /* Find process by port. */ | |
648 | inf = darwin_find_inferior_by_task (task_port); | |
649 | *pinf = inf; | |
650 | ||
651 | if (inf == NULL && data[0] == EXC_SOFTWARE && data[1] == 2 | |
652 | && data[2] == EXC_SOFT_SIGNAL && data[3] == SIGTRAP) | |
653 | { | |
654 | /* Not a known inferior, but a sigtrap. This happens on darwin 16.1.0, | |
655 | as a new Mach task is created when a process exec. */ | |
656 | inf = darwin_find_new_inferior (task_port, thread_port); | |
657 | *pinf = inf; | |
658 | ||
659 | if (inf == NULL) | |
660 | { | |
661 | /* Deallocate task_port, unless it was saved. */ | |
662 | kret = mach_port_deallocate (mach_task_self (), task_port); | |
663 | MACH_CHECK_ERROR (kret); | |
664 | } | |
665 | } | |
666 | else | |
667 | { | |
668 | /* We got new rights to the task, get rid of it. Do not get rid of | |
669 | thread right, as we will need it to find the thread. */ | |
670 | kret = mach_port_deallocate (mach_task_self (), task_port); | |
671 | MACH_CHECK_ERROR (kret); | |
672 | } | |
673 | ||
674 | if (inf == NULL) | |
675 | { | |
676 | /* Not a known inferior. This could happen if the child fork, as | |
677 | the created process will inherit its exception port. | |
678 | FIXME: should the exception port be restored ? */ | |
679 | mig_reply_error_t reply; | |
680 | ||
681 | inferior_debug | |
682 | (4, _("darwin_decode_exception_message: unknown task 0x%x\n"), | |
683 | task_port); | |
684 | ||
685 | /* Free thread port (we don't know it). */ | |
686 | kret = mach_port_deallocate (mach_task_self (), thread_port); | |
687 | MACH_CHECK_ERROR (kret); | |
688 | ||
689 | darwin_encode_reply (&reply, hdr, KERN_SUCCESS); | |
690 | ||
691 | kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT, | |
692 | reply.Head.msgh_size, 0, | |
693 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, | |
694 | MACH_PORT_NULL); | |
695 | MACH_CHECK_ERROR (kret); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | /* Find thread by port. */ | |
701 | /* Check for new threads. Do it early so that the port in the exception | |
702 | message can be deallocated. */ | |
703 | check_new_threads (inf); | |
704 | ||
705 | /* Free the thread port (as gdb knows the thread, it has already has a right | |
706 | for it, so this just decrement a reference counter). */ | |
707 | kret = mach_port_deallocate (mach_task_self (), thread_port); | |
708 | MACH_CHECK_ERROR (kret); | |
709 | ||
710 | thread = darwin_find_thread (inf, thread_port); | |
711 | if (thread == NULL) | |
712 | return -1; | |
713 | *pthread = thread; | |
714 | ||
715 | /* The thread should be running. However we have observed cases where a | |
716 | thread got a SIGTTIN message after being stopped. */ | |
717 | gdb_assert (thread->msg_state != DARWIN_MESSAGE); | |
718 | ||
719 | /* Finish decoding. */ | |
720 | thread->event.header = *hdr; | |
721 | thread->event.thread_port = thread_port; | |
722 | thread->event.task_port = task_port; | |
723 | thread->event.ex_type = data[0]; | |
724 | thread->event.data_count = data[1]; | |
725 | ||
726 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc) | |
727 | + sizeof (*ndr) + 2 * sizeof (integer_t) | |
728 | + data[1] * sizeof (integer_t))) | |
729 | return -1; | |
730 | for (i = 0; i < data[1]; i++) | |
731 | thread->event.ex_data[i] = data[2 + i]; | |
732 | ||
733 | thread->msg_state = DARWIN_MESSAGE; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | /* Decode dead_name notify message. */ | |
739 | ||
740 | static int | |
741 | darwin_decode_notify_message (mach_msg_header_t *hdr, struct inferior **pinf) | |
742 | { | |
743 | NDR_record_t *ndr = (NDR_record_t *)(hdr + 1); | |
744 | integer_t *data = (integer_t *)(ndr + 1); | |
745 | struct inferior *inf; | |
746 | task_t task_port; | |
747 | ||
748 | /* Check message header. */ | |
749 | if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX) | |
750 | return -1; | |
751 | ||
752 | /* Check descriptors. */ | |
753 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*ndr) + sizeof (integer_t))) | |
754 | return -2; | |
755 | ||
756 | /* Check data representation. */ | |
757 | if (darwin_check_message_ndr (ndr) != 0) | |
758 | return -3; | |
759 | ||
760 | task_port = data[0]; | |
761 | ||
762 | /* Find process by port. */ | |
763 | inf = darwin_find_inferior_by_task (task_port); | |
764 | *pinf = inf; | |
765 | ||
766 | /* Check message destination. */ | |
767 | if (inf != NULL) | |
768 | { | |
769 | darwin_inferior *priv = get_darwin_inferior (inf); | |
770 | if (hdr->msgh_local_port != priv->notify_port) | |
771 | return -4; | |
772 | } | |
773 | ||
774 | return 0; | |
775 | } | |
776 | ||
777 | static void | |
778 | darwin_encode_reply (mig_reply_error_t *reply, mach_msg_header_t *hdr, | |
779 | integer_t code) | |
780 | { | |
781 | mach_msg_header_t *rh = &reply->Head; | |
782 | ||
783 | rh->msgh_bits = MACH_MSGH_BITS (MACH_MSGH_BITS_REMOTE (hdr->msgh_bits), 0); | |
784 | rh->msgh_remote_port = hdr->msgh_remote_port; | |
785 | rh->msgh_size = (mach_msg_size_t) sizeof (mig_reply_error_t); | |
786 | rh->msgh_local_port = MACH_PORT_NULL; | |
787 | rh->msgh_id = hdr->msgh_id + 100; | |
788 | ||
789 | reply->NDR = NDR_record; | |
790 | reply->RetCode = code; | |
791 | } | |
792 | ||
793 | static void | |
794 | darwin_send_reply (struct inferior *inf, darwin_thread_t *thread) | |
795 | { | |
796 | kern_return_t kret; | |
797 | mig_reply_error_t reply; | |
798 | darwin_inferior *priv = get_darwin_inferior (inf); | |
799 | ||
800 | darwin_encode_reply (&reply, &thread->event.header, KERN_SUCCESS); | |
801 | ||
802 | kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT, | |
803 | reply.Head.msgh_size, 0, | |
804 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, | |
805 | MACH_PORT_NULL); | |
806 | MACH_CHECK_ERROR (kret); | |
807 | ||
808 | priv->pending_messages--; | |
809 | } | |
810 | ||
811 | /* Wrapper around the __pthread_kill syscall. We use this instead of the | |
812 | pthread_kill function to be able to send a signal to any kind of thread, | |
813 | including GCD threads. */ | |
814 | ||
815 | static int | |
816 | darwin_pthread_kill (darwin_thread_t *thread, int nsignal) | |
817 | { | |
818 | DIAGNOSTIC_PUSH; | |
819 | DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS; | |
820 | int res = syscall (SYS___pthread_kill, thread->gdb_port, nsignal); | |
821 | DIAGNOSTIC_POP; | |
822 | return res; | |
823 | } | |
824 | ||
825 | static void | |
826 | darwin_resume_thread (struct inferior *inf, darwin_thread_t *thread, | |
827 | int step, int nsignal) | |
828 | { | |
829 | inferior_debug | |
830 | (3, _("darwin_resume_thread: state=%d, thread=0x%x, step=%d nsignal=%d\n"), | |
831 | thread->msg_state, thread->gdb_port, step, nsignal); | |
832 | ||
833 | switch (thread->msg_state) | |
834 | { | |
835 | case DARWIN_MESSAGE: | |
836 | if (thread->event.ex_type == EXC_SOFTWARE | |
837 | && thread->event.ex_data[0] == EXC_SOFT_SIGNAL) | |
838 | { | |
839 | /* Either deliver a new signal or cancel the signal received. */ | |
840 | int res = PTRACE (PT_THUPDATE, inf->pid, | |
841 | (caddr_t) (uintptr_t) thread->gdb_port, nsignal); | |
842 | if (res < 0) | |
843 | inferior_debug (1, _("ptrace THUP: res=%d\n"), res); | |
844 | } | |
845 | else if (nsignal) | |
846 | { | |
847 | /* Note: ptrace is allowed only if the process is stopped. | |
848 | Directly send the signal to the thread. */ | |
849 | int res = darwin_pthread_kill (thread, nsignal); | |
850 | inferior_debug (4, _("darwin_resume_thread: kill 0x%x %d: %d\n"), | |
851 | thread->gdb_port, nsignal, res); | |
852 | thread->signaled = 1; | |
853 | } | |
854 | ||
855 | /* Set or reset single step. */ | |
856 | inferior_debug (4, _("darwin_set_sstep (thread=0x%x, enable=%d)\n"), | |
857 | thread->gdb_port, step); | |
858 | darwin_set_sstep (thread->gdb_port, step); | |
859 | thread->single_step = step; | |
860 | ||
861 | darwin_send_reply (inf, thread); | |
862 | thread->msg_state = DARWIN_RUNNING; | |
863 | break; | |
864 | ||
865 | case DARWIN_RUNNING: | |
866 | break; | |
867 | ||
868 | case DARWIN_STOPPED: | |
869 | kern_return_t kret = thread_resume (thread->gdb_port); | |
870 | MACH_CHECK_ERROR (kret); | |
871 | ||
872 | thread->msg_state = DARWIN_RUNNING; | |
873 | break; | |
874 | } | |
875 | } | |
876 | ||
877 | /* Resume all threads of the inferior. */ | |
878 | ||
879 | static void | |
880 | darwin_resume_inferior_threads (struct inferior *inf, int step, int nsignal) | |
881 | { | |
882 | darwin_inferior *priv = get_darwin_inferior (inf); | |
883 | ||
884 | if (priv != nullptr) | |
885 | for (darwin_thread_t *thread : priv->threads) | |
886 | darwin_resume_thread (inf, thread, step, nsignal); | |
887 | } | |
888 | ||
889 | struct resume_inferior_threads_param | |
890 | { | |
891 | int step; | |
892 | int nsignal; | |
893 | }; | |
894 | ||
895 | static int | |
896 | darwin_resume_inferior_threads_it (struct inferior *inf, void *param) | |
897 | { | |
898 | int step = ((struct resume_inferior_threads_param *)param)->step; | |
899 | int nsignal = ((struct resume_inferior_threads_param *)param)->nsignal; | |
900 | ||
901 | darwin_resume_inferior_threads (inf, step, nsignal); | |
902 | ||
903 | return 0; | |
904 | } | |
905 | ||
906 | /* Suspend all threads of INF. */ | |
907 | ||
908 | static void | |
909 | darwin_suspend_inferior_threads (struct inferior *inf) | |
910 | { | |
911 | darwin_inferior *priv = get_darwin_inferior (inf); | |
912 | ||
913 | for (darwin_thread_t *thread : priv->threads) | |
914 | { | |
915 | switch (thread->msg_state) | |
916 | { | |
917 | case DARWIN_STOPPED: | |
918 | case DARWIN_MESSAGE: | |
919 | break; | |
920 | case DARWIN_RUNNING: | |
921 | { | |
922 | kern_return_t kret = thread_suspend (thread->gdb_port); | |
923 | MACH_CHECK_ERROR (kret); | |
924 | thread->msg_state = DARWIN_STOPPED; | |
925 | break; | |
926 | } | |
927 | } | |
928 | } | |
929 | } | |
930 | ||
931 | void | |
932 | darwin_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal) | |
933 | { | |
934 | struct target_waitstatus status; | |
935 | ||
936 | int nsignal; | |
937 | ||
938 | inferior_debug | |
939 | (2, _("darwin_resume: pid=%d, tid=0x%lx, step=%d, signal=%d\n"), | |
940 | ptid.pid (), ptid.tid (), step, signal); | |
941 | ||
942 | if (signal == GDB_SIGNAL_0) | |
943 | nsignal = 0; | |
944 | else | |
945 | nsignal = gdb_signal_to_host (signal); | |
946 | ||
947 | /* Don't try to single step all threads. */ | |
948 | if (step) | |
949 | ptid = inferior_ptid; | |
950 | ||
951 | /* minus_one_ptid is RESUME_ALL. */ | |
952 | if (ptid == minus_one_ptid) | |
953 | { | |
954 | struct resume_inferior_threads_param param; | |
955 | ||
956 | param.nsignal = nsignal; | |
957 | param.step = step; | |
958 | ||
959 | /* Resume threads. */ | |
960 | iterate_over_inferiors (darwin_resume_inferior_threads_it, ¶m); | |
961 | /* Resume tasks. */ | |
962 | iterate_over_inferiors (darwin_resume_inferior_it, NULL); | |
963 | } | |
964 | else | |
965 | { | |
966 | inferior *inf = find_inferior_ptid (this, ptid); | |
967 | long tid = ptid.tid (); | |
968 | ||
969 | /* Stop the inferior (should be useless). */ | |
970 | darwin_suspend_inferior (inf); | |
971 | ||
972 | if (tid == 0) | |
973 | darwin_resume_inferior_threads (inf, step, nsignal); | |
974 | else | |
975 | { | |
976 | darwin_thread_t *thread; | |
977 | ||
978 | /* Suspend threads of the task. */ | |
979 | darwin_suspend_inferior_threads (inf); | |
980 | ||
981 | /* Resume the selected thread. */ | |
982 | thread = darwin_find_thread (inf, tid); | |
983 | gdb_assert (thread); | |
984 | darwin_resume_thread (inf, thread, step, nsignal); | |
985 | } | |
986 | ||
987 | /* Resume the task. */ | |
988 | darwin_resume_inferior (inf); | |
989 | } | |
990 | } | |
991 | ||
992 | ptid_t | |
993 | darwin_nat_target::decode_message (mach_msg_header_t *hdr, | |
994 | darwin_thread_t **pthread, | |
995 | inferior **pinf, | |
996 | target_waitstatus *status) | |
997 | { | |
998 | darwin_thread_t *thread; | |
999 | struct inferior *inf; | |
1000 | ||
1001 | /* Exception message. 2401 == 0x961 is exc. */ | |
1002 | if (hdr->msgh_id == 2401) | |
1003 | { | |
1004 | int res; | |
1005 | ||
1006 | /* Decode message. */ | |
1007 | res = decode_exception_message (hdr, &inf, &thread); | |
1008 | ||
1009 | if (res < 0) | |
1010 | { | |
1011 | /* Should not happen... */ | |
1012 | printf_unfiltered | |
1013 | (_("darwin_wait: ill-formatted message (id=0x%x)\n"), hdr->msgh_id); | |
1014 | /* FIXME: send a failure reply? */ | |
1015 | status->kind = TARGET_WAITKIND_IGNORE; | |
1016 | return minus_one_ptid; | |
1017 | } | |
1018 | if (inf == NULL) | |
1019 | { | |
1020 | status->kind = TARGET_WAITKIND_IGNORE; | |
1021 | return minus_one_ptid; | |
1022 | } | |
1023 | *pinf = inf; | |
1024 | *pthread = thread; | |
1025 | ||
1026 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1027 | ||
1028 | priv->pending_messages++; | |
1029 | ||
1030 | status->kind = TARGET_WAITKIND_STOPPED; | |
1031 | thread->msg_state = DARWIN_MESSAGE; | |
1032 | ||
1033 | inferior_debug (4, _("darwin_wait: thread=0x%x, got %s\n"), | |
1034 | thread->gdb_port, | |
1035 | unparse_exception_type (thread->event.ex_type)); | |
1036 | ||
1037 | switch (thread->event.ex_type) | |
1038 | { | |
1039 | case EXC_BAD_ACCESS: | |
1040 | status->value.sig = GDB_EXC_BAD_ACCESS; | |
1041 | break; | |
1042 | case EXC_BAD_INSTRUCTION: | |
1043 | status->value.sig = GDB_EXC_BAD_INSTRUCTION; | |
1044 | break; | |
1045 | case EXC_ARITHMETIC: | |
1046 | status->value.sig = GDB_EXC_ARITHMETIC; | |
1047 | break; | |
1048 | case EXC_EMULATION: | |
1049 | status->value.sig = GDB_EXC_EMULATION; | |
1050 | break; | |
1051 | case EXC_SOFTWARE: | |
1052 | if (thread->event.ex_data[0] == EXC_SOFT_SIGNAL) | |
1053 | { | |
1054 | status->value.sig = | |
1055 | gdb_signal_from_host (thread->event.ex_data[1]); | |
1056 | inferior_debug (5, _(" (signal %d: %s)\n"), | |
1057 | thread->event.ex_data[1], | |
1058 | gdb_signal_to_name (status->value.sig)); | |
1059 | ||
1060 | /* If the thread is stopped because it has received a signal | |
1061 | that gdb has just sent, continue. */ | |
1062 | if (thread->signaled) | |
1063 | { | |
1064 | thread->signaled = 0; | |
1065 | darwin_send_reply (inf, thread); | |
1066 | thread->msg_state = DARWIN_RUNNING; | |
1067 | status->kind = TARGET_WAITKIND_IGNORE; | |
1068 | } | |
1069 | } | |
1070 | else | |
1071 | status->value.sig = GDB_EXC_SOFTWARE; | |
1072 | break; | |
1073 | case EXC_BREAKPOINT: | |
1074 | /* Many internal GDB routines expect breakpoints to be reported | |
1075 | as GDB_SIGNAL_TRAP, and will report GDB_EXC_BREAKPOINT | |
1076 | as a spurious signal. */ | |
1077 | status->value.sig = GDB_SIGNAL_TRAP; | |
1078 | break; | |
1079 | default: | |
1080 | status->value.sig = GDB_SIGNAL_UNKNOWN; | |
1081 | break; | |
1082 | } | |
1083 | ||
1084 | return ptid_t (inf->pid, 0, thread->gdb_port); | |
1085 | } | |
1086 | else if (hdr->msgh_id == 0x48) | |
1087 | { | |
1088 | /* MACH_NOTIFY_DEAD_NAME: notification for exit. */ | |
1089 | int res; | |
1090 | ||
1091 | res = darwin_decode_notify_message (hdr, &inf); | |
1092 | ||
1093 | if (res < 0) | |
1094 | { | |
1095 | /* Should not happen... */ | |
1096 | printf_unfiltered | |
1097 | (_("darwin_wait: ill-formatted message (id=0x%x, res=%d)\n"), | |
1098 | hdr->msgh_id, res); | |
1099 | } | |
1100 | ||
1101 | *pinf = NULL; | |
1102 | *pthread = NULL; | |
1103 | ||
1104 | if (res < 0 || inf == NULL) | |
1105 | { | |
1106 | status->kind = TARGET_WAITKIND_IGNORE; | |
1107 | return minus_one_ptid; | |
1108 | } | |
1109 | ||
1110 | if (inf != NULL) | |
1111 | { | |
1112 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1113 | ||
1114 | if (!priv->no_ptrace) | |
1115 | { | |
1116 | pid_t res_pid; | |
1117 | int wstatus; | |
1118 | ||
1119 | res_pid = wait4 (inf->pid, &wstatus, 0, NULL); | |
1120 | if (res_pid < 0 || res_pid != inf->pid) | |
1121 | { | |
1122 | printf_unfiltered (_("wait4: res=%d: %s\n"), | |
1123 | res_pid, safe_strerror (errno)); | |
1124 | status->kind = TARGET_WAITKIND_IGNORE; | |
1125 | return minus_one_ptid; | |
1126 | } | |
1127 | if (WIFEXITED (wstatus)) | |
1128 | { | |
1129 | status->kind = TARGET_WAITKIND_EXITED; | |
1130 | status->value.integer = WEXITSTATUS (wstatus); | |
1131 | } | |
1132 | else | |
1133 | { | |
1134 | status->kind = TARGET_WAITKIND_SIGNALLED; | |
1135 | status->value.sig = gdb_signal_from_host (WTERMSIG (wstatus)); | |
1136 | } | |
1137 | ||
1138 | inferior_debug (4, _("darwin_wait: pid=%d exit, status=0x%x\n"), | |
1139 | res_pid, wstatus); | |
1140 | ||
1141 | /* Looks necessary on Leopard and harmless... */ | |
1142 | wait4 (inf->pid, &wstatus, 0, NULL); | |
1143 | ||
1144 | inferior_ptid = ptid_t (inf->pid, 0, 0); | |
1145 | return inferior_ptid; | |
1146 | } | |
1147 | else | |
1148 | { | |
1149 | inferior_debug (4, _("darwin_wait: pid=%d\n"), inf->pid); | |
1150 | status->kind = TARGET_WAITKIND_EXITED; | |
1151 | status->value.integer = 0; /* Don't know. */ | |
1152 | return ptid_t (inf->pid, 0, 0); | |
1153 | } | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | /* Unknown message. */ | |
1158 | warning (_("darwin: got unknown message, id: 0x%x"), hdr->msgh_id); | |
1159 | status->kind = TARGET_WAITKIND_IGNORE; | |
1160 | return minus_one_ptid; | |
1161 | } | |
1162 | ||
1163 | int | |
1164 | darwin_nat_target::cancel_breakpoint (ptid_t ptid) | |
1165 | { | |
1166 | /* Arrange for a breakpoint to be hit again later. We will handle | |
1167 | the current event, eventually we will resume this thread, and this | |
1168 | breakpoint will trap again. | |
1169 | ||
1170 | If we do not do this, then we run the risk that the user will | |
1171 | delete or disable the breakpoint, but the thread will have already | |
1172 | tripped on it. */ | |
1173 | ||
1174 | struct regcache *regcache = get_thread_regcache (this, ptid); | |
1175 | struct gdbarch *gdbarch = regcache->arch (); | |
1176 | CORE_ADDR pc; | |
1177 | ||
1178 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
1179 | if (breakpoint_inserted_here_p (regcache->aspace (), pc)) | |
1180 | { | |
1181 | inferior_debug (4, "cancel_breakpoint for thread 0x%lx\n", | |
1182 | (unsigned long) ptid.tid ()); | |
1183 | ||
1184 | /* Back up the PC if necessary. */ | |
1185 | if (gdbarch_decr_pc_after_break (gdbarch)) | |
1186 | regcache_write_pc (regcache, pc); | |
1187 | ||
1188 | return 1; | |
1189 | } | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | ptid_t | |
1194 | darwin_nat_target::wait_1 (ptid_t ptid, struct target_waitstatus *status) | |
1195 | { | |
1196 | kern_return_t kret; | |
1197 | union | |
1198 | { | |
1199 | mach_msg_header_t hdr; | |
1200 | char data[0x100]; | |
1201 | } msgin; | |
1202 | mach_msg_header_t *hdr = &msgin.hdr; | |
1203 | ptid_t res; | |
1204 | darwin_thread_t *thread; | |
1205 | ||
1206 | inferior_debug | |
1207 | (2, _("darwin_wait: waiting for a message pid=%d thread=%lx\n"), | |
1208 | ptid.pid (), ptid.tid ()); | |
1209 | ||
1210 | /* Handle fake stop events at first. */ | |
1211 | if (darwin_inf_fake_stop != NULL) | |
1212 | { | |
1213 | inferior *inf = darwin_inf_fake_stop; | |
1214 | darwin_inf_fake_stop = NULL; | |
1215 | ||
1216 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1217 | ||
1218 | status->kind = TARGET_WAITKIND_STOPPED; | |
1219 | status->value.sig = GDB_SIGNAL_TRAP; | |
1220 | thread = priv->threads[0]; | |
1221 | thread->msg_state = DARWIN_STOPPED; | |
1222 | return ptid_t (inf->pid, 0, thread->gdb_port); | |
1223 | } | |
1224 | ||
1225 | do | |
1226 | { | |
1227 | /* set_sigint_trap (); */ | |
1228 | ||
1229 | /* Wait for a message. */ | |
1230 | kret = mach_msg (&msgin.hdr, MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0, | |
1231 | sizeof (msgin.data), darwin_port_set, 0, MACH_PORT_NULL); | |
1232 | ||
1233 | /* clear_sigint_trap (); */ | |
1234 | ||
1235 | if (kret == MACH_RCV_INTERRUPTED) | |
1236 | { | |
1237 | status->kind = TARGET_WAITKIND_IGNORE; | |
1238 | return minus_one_ptid; | |
1239 | } | |
1240 | ||
1241 | if (kret != MACH_MSG_SUCCESS) | |
1242 | { | |
1243 | inferior_debug (5, _("mach_msg: ret=0x%x\n"), kret); | |
1244 | status->kind = TARGET_WAITKIND_SPURIOUS; | |
1245 | return minus_one_ptid; | |
1246 | } | |
1247 | ||
1248 | /* Debug: display message. */ | |
1249 | if (darwin_debug_flag > 10) | |
1250 | darwin_dump_message (hdr, darwin_debug_flag > 11); | |
1251 | ||
1252 | inferior *inf; | |
1253 | res = decode_message (hdr, &thread, &inf, status); | |
1254 | if (res == minus_one_ptid) | |
1255 | continue; | |
1256 | ||
1257 | /* Early return in case an inferior has exited. */ | |
1258 | if (inf == NULL) | |
1259 | return res; | |
1260 | } | |
1261 | while (status->kind == TARGET_WAITKIND_IGNORE); | |
1262 | ||
1263 | /* Stop all tasks. */ | |
1264 | for (inferior *inf : all_inferiors (this)) | |
1265 | { | |
1266 | darwin_suspend_inferior (inf); | |
1267 | check_new_threads (inf); | |
1268 | } | |
1269 | ||
1270 | /* Read pending messages. */ | |
1271 | while (1) | |
1272 | { | |
1273 | struct target_waitstatus status2; | |
1274 | ptid_t ptid2; | |
1275 | ||
1276 | kret = mach_msg (&msgin.hdr, | |
1277 | MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0, | |
1278 | sizeof (msgin.data), darwin_port_set, 1, MACH_PORT_NULL); | |
1279 | ||
1280 | if (kret == MACH_RCV_TIMED_OUT) | |
1281 | break; | |
1282 | if (kret != MACH_MSG_SUCCESS) | |
1283 | { | |
1284 | inferior_debug | |
1285 | (5, _("darwin_wait: mach_msg(pending) ret=0x%x\n"), kret); | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | /* Debug: display message. */ | |
1290 | if (darwin_debug_flag > 10) | |
1291 | darwin_dump_message (hdr, darwin_debug_flag > 11); | |
1292 | ||
1293 | inferior *inf; | |
1294 | ptid2 = decode_message (hdr, &thread, &inf, &status2); | |
1295 | ||
1296 | if (inf != NULL && thread != NULL | |
1297 | && thread->event.ex_type == EXC_BREAKPOINT) | |
1298 | { | |
1299 | if (thread->single_step | |
1300 | || cancel_breakpoint (ptid_t (inf->pid, 0, thread->gdb_port))) | |
1301 | { | |
1302 | gdb_assert (thread->msg_state == DARWIN_MESSAGE); | |
1303 | darwin_send_reply (inf, thread); | |
1304 | thread->msg_state = DARWIN_RUNNING; | |
1305 | } | |
1306 | else | |
1307 | inferior_debug | |
1308 | (3, _("darwin_wait: thread 0x%x hit a non-gdb breakpoint\n"), | |
1309 | thread->gdb_port); | |
1310 | } | |
1311 | else | |
1312 | inferior_debug (3, _("darwin_wait: unhandled pending message\n")); | |
1313 | } | |
1314 | return res; | |
1315 | } | |
1316 | ||
1317 | ptid_t | |
1318 | darwin_nat_target::wait (ptid_t ptid, struct target_waitstatus *status, | |
1319 | int options) | |
1320 | { | |
1321 | return wait_1 (ptid, status); | |
1322 | } | |
1323 | ||
1324 | void | |
1325 | darwin_nat_target::interrupt () | |
1326 | { | |
1327 | struct inferior *inf = current_inferior (); | |
1328 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1329 | ||
1330 | /* FIXME: handle in no_ptrace mode. */ | |
1331 | gdb_assert (!priv->no_ptrace); | |
1332 | ::kill (inf->pid, SIGINT); | |
1333 | } | |
1334 | ||
1335 | /* Deallocate threads port and vector. */ | |
1336 | ||
1337 | static void | |
1338 | darwin_deallocate_threads (struct inferior *inf) | |
1339 | { | |
1340 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1341 | ||
1342 | for (darwin_thread_t *t : priv->threads) | |
1343 | { | |
1344 | kern_return_t kret = mach_port_deallocate (gdb_task, t->gdb_port); | |
1345 | MACH_CHECK_ERROR (kret); | |
1346 | } | |
1347 | ||
1348 | priv->threads.clear (); | |
1349 | } | |
1350 | ||
1351 | void | |
1352 | darwin_nat_target::mourn_inferior () | |
1353 | { | |
1354 | struct inferior *inf = current_inferior (); | |
1355 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1356 | kern_return_t kret; | |
1357 | mach_port_t prev; | |
1358 | ||
1359 | /* Deallocate threads. */ | |
1360 | darwin_deallocate_threads (inf); | |
1361 | ||
1362 | /* Remove notify_port from darwin_port_set. */ | |
1363 | kret = mach_port_move_member (gdb_task, | |
1364 | priv->notify_port, MACH_PORT_NULL); | |
1365 | MACH_CHECK_ERROR (kret); | |
1366 | ||
1367 | /* Remove task port dead_name notification. */ | |
1368 | kret = mach_port_request_notification (gdb_task, priv->task, | |
1369 | MACH_NOTIFY_DEAD_NAME, 0, | |
1370 | MACH_PORT_NULL, | |
1371 | MACH_MSG_TYPE_MAKE_SEND_ONCE, | |
1372 | &prev); | |
1373 | /* This can fail if the task is dead. */ | |
1374 | inferior_debug (4, "task=0x%x, prev=0x%x, notify_port=0x%x\n", | |
1375 | priv->task, prev, priv->notify_port); | |
1376 | ||
1377 | if (kret == KERN_SUCCESS) | |
1378 | { | |
1379 | kret = mach_port_deallocate (gdb_task, prev); | |
1380 | MACH_CHECK_ERROR (kret); | |
1381 | } | |
1382 | ||
1383 | /* Destroy notify_port. */ | |
1384 | kret = mach_port_destroy (gdb_task, priv->notify_port); | |
1385 | MACH_CHECK_ERROR (kret); | |
1386 | ||
1387 | /* Deallocate saved exception ports. */ | |
1388 | darwin_deallocate_exception_ports (priv); | |
1389 | ||
1390 | /* Deallocate task port. */ | |
1391 | kret = mach_port_deallocate (gdb_task, priv->task); | |
1392 | MACH_CHECK_ERROR (kret); | |
1393 | ||
1394 | inf->priv = NULL; | |
1395 | ||
1396 | inf_child_target::mourn_inferior (); | |
1397 | } | |
1398 | ||
1399 | static void | |
1400 | darwin_reply_to_all_pending_messages (struct inferior *inf) | |
1401 | { | |
1402 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1403 | ||
1404 | for (darwin_thread_t *t : priv->threads) | |
1405 | { | |
1406 | if (t->msg_state == DARWIN_MESSAGE) | |
1407 | darwin_resume_thread (inf, t, 0, 0); | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | void | |
1412 | darwin_nat_target::stop_inferior (inferior *inf) | |
1413 | { | |
1414 | struct target_waitstatus wstatus; | |
1415 | ptid_t ptid; | |
1416 | int res; | |
1417 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1418 | ||
1419 | gdb_assert (inf != NULL); | |
1420 | ||
1421 | darwin_suspend_inferior (inf); | |
1422 | ||
1423 | darwin_reply_to_all_pending_messages (inf); | |
1424 | ||
1425 | if (priv->no_ptrace) | |
1426 | return; | |
1427 | ||
1428 | res = ::kill (inf->pid, SIGSTOP); | |
1429 | if (res != 0) | |
1430 | warning (_("cannot kill: %s"), safe_strerror (errno)); | |
1431 | ||
1432 | /* Wait until the process is really stopped. */ | |
1433 | while (1) | |
1434 | { | |
1435 | ptid = wait_1 (inferior_ptid, &wstatus); | |
1436 | if (wstatus.kind == TARGET_WAITKIND_STOPPED | |
1437 | && wstatus.value.sig == GDB_SIGNAL_STOP) | |
1438 | break; | |
1439 | } | |
1440 | } | |
1441 | ||
1442 | static kern_return_t | |
1443 | darwin_save_exception_ports (darwin_inferior *inf) | |
1444 | { | |
1445 | kern_return_t kret; | |
1446 | ||
1447 | inf->exception_info.count = | |
1448 | sizeof (inf->exception_info.ports) / sizeof (inf->exception_info.ports[0]); | |
1449 | ||
1450 | kret = task_get_exception_ports | |
1451 | (inf->task, EXC_MASK_ALL, inf->exception_info.masks, | |
1452 | &inf->exception_info.count, inf->exception_info.ports, | |
1453 | inf->exception_info.behaviors, inf->exception_info.flavors); | |
1454 | return kret; | |
1455 | } | |
1456 | ||
1457 | static kern_return_t | |
1458 | darwin_restore_exception_ports (darwin_inferior *inf) | |
1459 | { | |
1460 | int i; | |
1461 | kern_return_t kret; | |
1462 | ||
1463 | for (i = 0; i < inf->exception_info.count; i++) | |
1464 | { | |
1465 | kret = task_set_exception_ports | |
1466 | (inf->task, inf->exception_info.masks[i], inf->exception_info.ports[i], | |
1467 | inf->exception_info.behaviors[i], inf->exception_info.flavors[i]); | |
1468 | if (kret != KERN_SUCCESS) | |
1469 | return kret; | |
1470 | } | |
1471 | ||
1472 | return KERN_SUCCESS; | |
1473 | } | |
1474 | ||
1475 | /* Deallocate saved exception ports. */ | |
1476 | ||
1477 | static void | |
1478 | darwin_deallocate_exception_ports (darwin_inferior *inf) | |
1479 | { | |
1480 | int i; | |
1481 | kern_return_t kret; | |
1482 | ||
1483 | for (i = 0; i < inf->exception_info.count; i++) | |
1484 | { | |
1485 | kret = mach_port_deallocate (gdb_task, inf->exception_info.ports[i]); | |
1486 | MACH_CHECK_ERROR (kret); | |
1487 | } | |
1488 | inf->exception_info.count = 0; | |
1489 | } | |
1490 | ||
1491 | static void | |
1492 | darwin_setup_exceptions (struct inferior *inf) | |
1493 | { | |
1494 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1495 | kern_return_t kret; | |
1496 | exception_mask_t mask; | |
1497 | ||
1498 | kret = darwin_save_exception_ports (priv); | |
1499 | if (kret != KERN_SUCCESS) | |
1500 | error (_("Unable to save exception ports, task_get_exception_ports" | |
1501 | "returned: %d"), | |
1502 | kret); | |
1503 | ||
1504 | /* Set exception port. */ | |
1505 | if (enable_mach_exceptions) | |
1506 | mask = EXC_MASK_ALL; | |
1507 | else | |
1508 | mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT; | |
1509 | kret = task_set_exception_ports (priv->task, mask, darwin_ex_port, | |
1510 | EXCEPTION_DEFAULT, THREAD_STATE_NONE); | |
1511 | if (kret != KERN_SUCCESS) | |
1512 | error (_("Unable to set exception ports, task_set_exception_ports" | |
1513 | "returned: %d"), | |
1514 | kret); | |
1515 | } | |
1516 | ||
1517 | void | |
1518 | darwin_nat_target::kill () | |
1519 | { | |
1520 | struct inferior *inf = current_inferior (); | |
1521 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1522 | struct target_waitstatus wstatus; | |
1523 | ptid_t ptid; | |
1524 | kern_return_t kret; | |
1525 | int res; | |
1526 | ||
1527 | if (inferior_ptid == null_ptid) | |
1528 | return; | |
1529 | ||
1530 | gdb_assert (inf != NULL); | |
1531 | ||
1532 | kret = darwin_restore_exception_ports (priv); | |
1533 | MACH_CHECK_ERROR (kret); | |
1534 | ||
1535 | darwin_reply_to_all_pending_messages (inf); | |
1536 | ||
1537 | res = ::kill (inf->pid, 9); | |
1538 | ||
1539 | if (res == 0) | |
1540 | { | |
1541 | /* On MacOS version Sierra, the darwin_restore_exception_ports call | |
1542 | does not work as expected. | |
1543 | When the kill function is called, the SIGKILL signal is received | |
1544 | by gdb whereas it should have been received by the kernel since | |
1545 | the exception ports have been restored. | |
1546 | This behavior is not the expected one thus gdb does not reply to | |
1547 | the received SIGKILL message. This situation leads to a "busy" | |
1548 | resource from the kernel point of view and the inferior is never | |
1549 | released, causing it to remain as a zombie process, even after | |
1550 | GDB exits. | |
1551 | To work around this, we mark all the threads of the inferior as | |
1552 | signaled thus darwin_decode_message function knows that the kill | |
1553 | signal was sent by gdb and will take the appropriate action | |
1554 | (cancel signal and reply to the signal message). */ | |
1555 | for (darwin_thread_t *thread : priv->threads) | |
1556 | thread->signaled = 1; | |
1557 | ||
1558 | darwin_resume_inferior (inf); | |
1559 | ||
1560 | ptid = wait_1 (inferior_ptid, &wstatus); | |
1561 | } | |
1562 | else if (errno != ESRCH) | |
1563 | warning (_("Failed to kill inferior: kill (%d, 9) returned [%s]"), | |
1564 | inf->pid, safe_strerror (errno)); | |
1565 | ||
1566 | target_mourn_inferior (inferior_ptid); | |
1567 | } | |
1568 | ||
1569 | static void | |
1570 | darwin_setup_request_notification (struct inferior *inf) | |
1571 | { | |
1572 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1573 | kern_return_t kret; | |
1574 | mach_port_t prev_not; | |
1575 | ||
1576 | kret = mach_port_request_notification (gdb_task, priv->task, | |
1577 | MACH_NOTIFY_DEAD_NAME, 0, | |
1578 | priv->notify_port, | |
1579 | MACH_MSG_TYPE_MAKE_SEND_ONCE, | |
1580 | &prev_not); | |
1581 | if (kret != KERN_SUCCESS) | |
1582 | error (_("Termination notification request failed, " | |
1583 | "mach_port_request_notification\n" | |
1584 | "returned: %d"), | |
1585 | kret); | |
1586 | if (prev_not != MACH_PORT_NULL) | |
1587 | { | |
1588 | /* This is unexpected, as there should not be any previously | |
1589 | registered notification request. But this is not a fatal | |
1590 | issue, so just emit a warning. */ | |
1591 | warning (_("\ | |
1592 | A task termination request was registered before the debugger registered\n\ | |
1593 | its own. This is unexpected, but should otherwise not have any actual\n\ | |
1594 | impact on the debugging session.")); | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | static void | |
1599 | darwin_attach_pid (struct inferior *inf) | |
1600 | { | |
1601 | kern_return_t kret; | |
1602 | ||
1603 | darwin_inferior *priv = new darwin_inferior; | |
1604 | inf->priv.reset (priv); | |
1605 | ||
1606 | try | |
1607 | { | |
1608 | kret = task_for_pid (gdb_task, inf->pid, &priv->task); | |
1609 | if (kret != KERN_SUCCESS) | |
1610 | { | |
1611 | int status; | |
1612 | ||
1613 | if (!inf->attach_flag) | |
1614 | { | |
1615 | kill (inf->pid, 9); | |
1616 | waitpid (inf->pid, &status, 0); | |
1617 | } | |
1618 | ||
1619 | error | |
1620 | (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n" | |
1621 | " (please check gdb is codesigned - see taskgated(8))"), | |
1622 | inf->pid, mach_error_string (kret), (unsigned long) kret); | |
1623 | } | |
1624 | ||
1625 | inferior_debug (2, _("inferior task: 0x%x, pid: %d\n"), | |
1626 | priv->task, inf->pid); | |
1627 | ||
1628 | if (darwin_ex_port == MACH_PORT_NULL) | |
1629 | { | |
1630 | /* Create a port to get exceptions. */ | |
1631 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, | |
1632 | &darwin_ex_port); | |
1633 | if (kret != KERN_SUCCESS) | |
1634 | error (_("Unable to create exception port, mach_port_allocate " | |
1635 | "returned: %d"), | |
1636 | kret); | |
1637 | ||
1638 | kret = mach_port_insert_right (gdb_task, darwin_ex_port, | |
1639 | darwin_ex_port, | |
1640 | MACH_MSG_TYPE_MAKE_SEND); | |
1641 | if (kret != KERN_SUCCESS) | |
1642 | error (_("Unable to create exception port, mach_port_insert_right " | |
1643 | "returned: %d"), | |
1644 | kret); | |
1645 | ||
1646 | /* Create a port set and put ex_port in it. */ | |
1647 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET, | |
1648 | &darwin_port_set); | |
1649 | if (kret != KERN_SUCCESS) | |
1650 | error (_("Unable to create port set, mach_port_allocate " | |
1651 | "returned: %d"), | |
1652 | kret); | |
1653 | ||
1654 | kret = mach_port_move_member (gdb_task, darwin_ex_port, | |
1655 | darwin_port_set); | |
1656 | if (kret != KERN_SUCCESS) | |
1657 | error (_("Unable to move exception port into new port set, " | |
1658 | "mach_port_move_member\n" | |
1659 | "returned: %d"), | |
1660 | kret); | |
1661 | } | |
1662 | ||
1663 | /* Create a port to be notified when the child task terminates. */ | |
1664 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, | |
1665 | &priv->notify_port); | |
1666 | if (kret != KERN_SUCCESS) | |
1667 | error (_("Unable to create notification port, mach_port_allocate " | |
1668 | "returned: %d"), | |
1669 | kret); | |
1670 | ||
1671 | kret = mach_port_move_member (gdb_task, | |
1672 | priv->notify_port, darwin_port_set); | |
1673 | if (kret != KERN_SUCCESS) | |
1674 | error (_("Unable to move notification port into new port set, " | |
1675 | "mach_port_move_member\n" | |
1676 | "returned: %d"), | |
1677 | kret); | |
1678 | ||
1679 | darwin_setup_request_notification (inf); | |
1680 | ||
1681 | darwin_setup_exceptions (inf); | |
1682 | } | |
1683 | catch (const gdb_exception &ex) | |
1684 | { | |
1685 | exit_inferior (inf); | |
1686 | inferior_ptid = null_ptid; | |
1687 | ||
1688 | throw; | |
1689 | } | |
1690 | ||
1691 | target_ops *darwin_ops = get_native_target (); | |
1692 | if (!target_is_pushed (darwin_ops)) | |
1693 | push_target (darwin_ops); | |
1694 | } | |
1695 | ||
1696 | /* Get the thread_info object corresponding to this darwin_thread_info. */ | |
1697 | ||
1698 | static struct thread_info * | |
1699 | thread_info_from_private_thread_info (darwin_thread_info *pti) | |
1700 | { | |
1701 | for (struct thread_info *it : all_threads ()) | |
1702 | { | |
1703 | darwin_thread_info *iter_pti = get_darwin_thread_info (it); | |
1704 | ||
1705 | if (iter_pti->gdb_port == pti->gdb_port) | |
1706 | return it; | |
1707 | } | |
1708 | ||
1709 | gdb_assert_not_reached ("did not find gdb thread for darwin thread"); | |
1710 | } | |
1711 | ||
1712 | void | |
1713 | darwin_nat_target::init_thread_list (inferior *inf) | |
1714 | { | |
1715 | check_new_threads (inf); | |
1716 | ||
1717 | darwin_inferior *priv = get_darwin_inferior (inf); | |
1718 | ||
1719 | gdb_assert (!priv->threads.empty ()); | |
1720 | ||
1721 | darwin_thread_info *first_pti = priv->threads.front (); | |
1722 | struct thread_info *first_thread | |
1723 | = thread_info_from_private_thread_info (first_pti); | |
1724 | ||
1725 | inferior_ptid = first_thread->ptid; | |
1726 | } | |
1727 | ||
1728 | /* The child must synchronize with gdb: gdb must set the exception port | |
1729 | before the child call PTRACE_SIGEXC. We use a pipe to achieve this. | |
1730 | FIXME: is there a lighter way ? */ | |
1731 | static int ptrace_fds[2]; | |
1732 | ||
1733 | static void | |
1734 | darwin_ptrace_me (void) | |
1735 | { | |
1736 | int res; | |
1737 | char c; | |
1738 | ||
1739 | /* Close write end point. */ | |
1740 | if (close (ptrace_fds[1]) < 0) | |
1741 | trace_start_error_with_name ("close"); | |
1742 | ||
1743 | /* Wait until gdb is ready. */ | |
1744 | res = read (ptrace_fds[0], &c, 1); | |
1745 | if (res != 0) | |
1746 | trace_start_error (_("unable to read from pipe, read returned: %d"), res); | |
1747 | ||
1748 | if (close (ptrace_fds[0]) < 0) | |
1749 | trace_start_error_with_name ("close"); | |
1750 | ||
1751 | /* Get rid of privileges. */ | |
1752 | if (setegid (getgid ()) < 0) | |
1753 | trace_start_error_with_name ("setegid"); | |
1754 | ||
1755 | /* Set TRACEME. */ | |
1756 | if (PTRACE (PT_TRACE_ME, 0, 0, 0) < 0) | |
1757 | trace_start_error_with_name ("PTRACE"); | |
1758 | ||
1759 | /* Redirect signals to exception port. */ | |
1760 | if (PTRACE (PT_SIGEXC, 0, 0, 0) < 0) | |
1761 | trace_start_error_with_name ("PTRACE"); | |
1762 | } | |
1763 | ||
1764 | /* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). */ | |
1765 | static void | |
1766 | darwin_pre_ptrace (void) | |
1767 | { | |
1768 | if (pipe (ptrace_fds) != 0) | |
1769 | { | |
1770 | ptrace_fds[0] = -1; | |
1771 | ptrace_fds[1] = -1; | |
1772 | error (_("unable to create a pipe: %s"), safe_strerror (errno)); | |
1773 | } | |
1774 | ||
1775 | mark_fd_no_cloexec (ptrace_fds[0]); | |
1776 | mark_fd_no_cloexec (ptrace_fds[1]); | |
1777 | } | |
1778 | ||
1779 | void | |
1780 | darwin_nat_target::ptrace_him (int pid) | |
1781 | { | |
1782 | struct inferior *inf = current_inferior (); | |
1783 | ||
1784 | darwin_attach_pid (inf); | |
1785 | ||
1786 | /* Let's the child run. */ | |
1787 | ::close (ptrace_fds[0]); | |
1788 | ::close (ptrace_fds[1]); | |
1789 | ||
1790 | unmark_fd_no_cloexec (ptrace_fds[0]); | |
1791 | unmark_fd_no_cloexec (ptrace_fds[1]); | |
1792 | ||
1793 | init_thread_list (inf); | |
1794 | ||
1795 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); | |
1796 | } | |
1797 | ||
1798 | static void | |
1799 | darwin_execvp (const char *file, char * const argv[], char * const env[]) | |
1800 | { | |
1801 | posix_spawnattr_t attr; | |
1802 | short ps_flags = 0; | |
1803 | int res; | |
1804 | ||
1805 | res = posix_spawnattr_init (&attr); | |
1806 | if (res != 0) | |
1807 | { | |
1808 | fprintf_unfiltered | |
1809 | (gdb_stderr, "Cannot initialize attribute for posix_spawn\n"); | |
1810 | return; | |
1811 | } | |
1812 | ||
1813 | /* Do like execve: replace the image. */ | |
1814 | ps_flags = POSIX_SPAWN_SETEXEC; | |
1815 | ||
1816 | /* Disable ASLR. The constant doesn't look to be available outside the | |
1817 | kernel include files. */ | |
1818 | #ifndef _POSIX_SPAWN_DISABLE_ASLR | |
1819 | #define _POSIX_SPAWN_DISABLE_ASLR 0x0100 | |
1820 | #endif | |
1821 | ps_flags |= _POSIX_SPAWN_DISABLE_ASLR; | |
1822 | res = posix_spawnattr_setflags (&attr, ps_flags); | |
1823 | if (res != 0) | |
1824 | { | |
1825 | fprintf_unfiltered (gdb_stderr, "Cannot set posix_spawn flags\n"); | |
1826 | return; | |
1827 | } | |
1828 | ||
1829 | posix_spawnp (NULL, argv[0], NULL, &attr, argv, env); | |
1830 | } | |
1831 | ||
1832 | /* Read kernel version, and return TRUE if this host may have System | |
1833 | Integrity Protection (Sierra or later). */ | |
1834 | ||
1835 | static bool | |
1836 | may_have_sip () | |
1837 | { | |
1838 | char str[16]; | |
1839 | size_t sz = sizeof (str); | |
1840 | int ret; | |
1841 | ||
1842 | ret = sysctlbyname ("kern.osrelease", str, &sz, NULL, 0); | |
1843 | if (ret == 0 && sz < sizeof (str)) | |
1844 | { | |
1845 | unsigned long ver = strtoul (str, NULL, 10); | |
1846 | if (ver >= 16) | |
1847 | return true; | |
1848 | } | |
1849 | return false; | |
1850 | } | |
1851 | ||
1852 | /* A helper for maybe_cache_shell. This copies the shell to the | |
1853 | cache. It will throw an exception on any failure. */ | |
1854 | ||
1855 | static void | |
1856 | copy_shell_to_cache (const char *shell, const std::string &new_name) | |
1857 | { | |
1858 | scoped_fd from_fd (gdb_open_cloexec (shell, O_RDONLY, 0)); | |
1859 | if (from_fd.get () < 0) | |
1860 | error (_("Could not open shell (%s) for reading: %s"), | |
1861 | shell, safe_strerror (errno)); | |
1862 | ||
1863 | std::string new_dir = ldirname (new_name.c_str ()); | |
1864 | if (!mkdir_recursive (new_dir.c_str ())) | |
1865 | error (_("Could not make cache directory \"%s\": %s"), | |
1866 | new_dir.c_str (), safe_strerror (errno)); | |
1867 | ||
1868 | gdb::char_vector temp_name = make_temp_filename (new_name); | |
1869 | scoped_fd to_fd (gdb_mkostemp_cloexec (&temp_name[0])); | |
1870 | gdb::unlinker unlink_file_on_error (temp_name.data ()); | |
1871 | ||
1872 | if (to_fd.get () < 0) | |
1873 | error (_("Could not open temporary file \"%s\" for writing: %s"), | |
1874 | temp_name.data (), safe_strerror (errno)); | |
1875 | ||
1876 | if (fcopyfile (from_fd.get (), to_fd.get (), nullptr, | |
1877 | COPYFILE_STAT | COPYFILE_DATA) != 0) | |
1878 | error (_("Could not copy shell to cache as \"%s\": %s"), | |
1879 | temp_name.data (), safe_strerror (errno)); | |
1880 | ||
1881 | /* Be sure that the caching is atomic so that we don't get bad | |
1882 | results from multiple copies of gdb running at the same time. */ | |
1883 | if (rename (temp_name.data (), new_name.c_str ()) != 0) | |
1884 | error (_("Could not rename shell cache file to \"%s\": %s"), | |
1885 | new_name.c_str (), safe_strerror (errno)); | |
1886 | ||
1887 | unlink_file_on_error.keep (); | |
1888 | } | |
1889 | ||
1890 | /* If $SHELL is restricted, try to cache a copy. Starting with El | |
1891 | Capitan, macOS introduced System Integrity Protection. Among other | |
1892 | things, this prevents certain executables from being ptrace'd. In | |
1893 | particular, executables in /bin, like most shells, are affected. | |
1894 | To work around this, while preserving command-line glob expansion | |
1895 | and redirections, gdb will cache a copy of the shell. Return true | |
1896 | if all is well -- either the shell is not subject to SIP or it has | |
1897 | been successfully cached. Returns false if something failed. */ | |
1898 | ||
1899 | static bool | |
1900 | maybe_cache_shell () | |
1901 | { | |
1902 | /* SF_RESTRICTED is defined in sys/stat.h and lets us determine if a | |
1903 | given file is subject to SIP. */ | |
1904 | #ifdef SF_RESTRICTED | |
1905 | ||
1906 | /* If a check fails we want to revert -- maybe the user deleted the | |
1907 | cache while gdb was running, or something like that. */ | |
1908 | copied_shell = nullptr; | |
1909 | ||
1910 | const char *shell = get_shell (); | |
1911 | if (!IS_ABSOLUTE_PATH (shell)) | |
1912 | { | |
1913 | warning (_("This version of macOS has System Integrity Protection.\n\ | |
1914 | Normally gdb would try to work around this by caching a copy of your shell,\n\ | |
1915 | but because your shell (%s) is not an absolute path, this is being skipped."), | |
1916 | shell); | |
1917 | return false; | |
1918 | } | |
1919 | ||
1920 | struct stat sb; | |
1921 | if (stat (shell, &sb) < 0) | |
1922 | { | |
1923 | warning (_("This version of macOS has System Integrity Protection.\n\ | |
1924 | Normally gdb would try to work around this by caching a copy of your shell,\n\ | |
1925 | but because gdb could not stat your shell (%s), this is being skipped.\n\ | |
1926 | The error was: %s"), | |
1927 | shell, safe_strerror (errno)); | |
1928 | return false; | |
1929 | } | |
1930 | ||
1931 | if ((sb.st_flags & SF_RESTRICTED) == 0) | |
1932 | return true; | |
1933 | ||
1934 | /* Put the copy somewhere like ~/Library/Caches/gdb/bin/sh. */ | |
1935 | std::string new_name = get_standard_cache_dir (); | |
1936 | /* There's no need to insert a directory separator here, because | |
1937 | SHELL is known to be absolute. */ | |
1938 | new_name.append (shell); | |
1939 | ||
1940 | /* Maybe it was cached by some earlier gdb. */ | |
1941 | if (stat (new_name.c_str (), &sb) != 0 || !S_ISREG (sb.st_mode)) | |
1942 | { | |
1943 | try | |
1944 | { | |
1945 | copy_shell_to_cache (shell, new_name); | |
1946 | } | |
1947 | catch (const gdb_exception_error &ex) | |
1948 | { | |
1949 | warning (_("This version of macOS has System Integrity Protection.\n\ | |
1950 | Because `startup-with-shell' is enabled, gdb tried to work around SIP by\n\ | |
1951 | caching a copy of your shell. However, this failed:\n\ | |
1952 | %s\n\ | |
1953 | If you correct the problem, gdb will automatically try again the next time\n\ | |
1954 | you \"run\". To prevent these attempts, you can use:\n\ | |
1955 | set startup-with-shell off"), | |
1956 | ex.what ()); | |
1957 | return false; | |
1958 | } | |
1959 | ||
1960 | printf_filtered (_("Note: this version of macOS has System Integrity Protection.\n\ | |
1961 | Because `startup-with-shell' is enabled, gdb has worked around this by\n\ | |
1962 | caching a copy of your shell. The shell used by \"run\" is now:\n\ | |
1963 | %s\n"), | |
1964 | new_name.c_str ()); | |
1965 | } | |
1966 | ||
1967 | /* We need to make sure that the new name has the correct lifetime. */ | |
1968 | static std::string saved_shell = std::move (new_name); | |
1969 | copied_shell = saved_shell.c_str (); | |
1970 | ||
1971 | #endif /* SF_RESTRICTED */ | |
1972 | ||
1973 | return true; | |
1974 | } | |
1975 | ||
1976 | void | |
1977 | darwin_nat_target::create_inferior (const char *exec_file, | |
1978 | const std::string &allargs, | |
1979 | char **env, int from_tty) | |
1980 | { | |
1981 | gdb::optional<scoped_restore_tmpl<bool>> restore_startup_with_shell; | |
1982 | darwin_nat_target *the_target = this; | |
1983 | ||
1984 | if (startup_with_shell && may_have_sip ()) | |
1985 | { | |
1986 | if (!maybe_cache_shell ()) | |
1987 | { | |
1988 | warning (_("startup-with-shell is now temporarily disabled")); | |
1989 | restore_startup_with_shell.emplace (&startup_with_shell, 0); | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | /* Do the hard work. */ | |
1994 | fork_inferior (exec_file, allargs, env, darwin_ptrace_me, | |
1995 | [the_target] (int pid) | |
1996 | { | |
1997 | the_target->ptrace_him (pid); | |
1998 | }, | |
1999 | darwin_pre_ptrace, copied_shell, | |
2000 | darwin_execvp); | |
2001 | } | |
2002 | \f | |
2003 | ||
2004 | /* Set things up such that the next call to darwin_wait will immediately | |
2005 | return a fake stop event for inferior INF. | |
2006 | ||
2007 | This assumes that the inferior's thread list has been initialized, | |
2008 | as it will suspend the inferior's first thread. */ | |
2009 | ||
2010 | static void | |
2011 | darwin_setup_fake_stop_event (struct inferior *inf) | |
2012 | { | |
2013 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2014 | darwin_thread_t *thread; | |
2015 | kern_return_t kret; | |
2016 | ||
2017 | gdb_assert (darwin_inf_fake_stop == NULL); | |
2018 | darwin_inf_fake_stop = inf; | |
2019 | ||
2020 | /* When detecting a fake pending stop event, darwin_wait returns | |
2021 | an event saying that the first thread is in a DARWIN_STOPPED | |
2022 | state. To make that accurate, we need to suspend that thread | |
2023 | as well. Otherwise, we'll try resuming it when resuming the | |
2024 | inferior, and get a warning because the thread's suspend count | |
2025 | is already zero, making the resume request useless. */ | |
2026 | thread = priv->threads[0]; | |
2027 | kret = thread_suspend (thread->gdb_port); | |
2028 | MACH_CHECK_ERROR (kret); | |
2029 | } | |
2030 | ||
2031 | /* Attach to process PID, then initialize for debugging it | |
2032 | and wait for the trace-trap that results from attaching. */ | |
2033 | void | |
2034 | darwin_nat_target::attach (const char *args, int from_tty) | |
2035 | { | |
2036 | pid_t pid; | |
2037 | struct inferior *inf; | |
2038 | ||
2039 | pid = parse_pid_to_attach (args); | |
2040 | ||
2041 | if (pid == getpid ()) /* Trying to masturbate? */ | |
2042 | error (_("I refuse to debug myself!")); | |
2043 | ||
2044 | if (from_tty) | |
2045 | { | |
2046 | const char *exec_file = get_exec_file (0); | |
2047 | ||
2048 | if (exec_file) | |
2049 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, | |
2050 | target_pid_to_str (ptid_t (pid)).c_str ()); | |
2051 | else | |
2052 | printf_unfiltered (_("Attaching to %s\n"), | |
2053 | target_pid_to_str (ptid_t (pid)).c_str ()); | |
2054 | } | |
2055 | ||
2056 | if (pid == 0 || ::kill (pid, 0) < 0) | |
2057 | error (_("Can't attach to process %d: %s (%d)"), | |
2058 | pid, safe_strerror (errno), errno); | |
2059 | ||
2060 | inferior_ptid = ptid_t (pid); | |
2061 | inf = current_inferior (); | |
2062 | inferior_appeared (inf, pid); | |
2063 | inf->attach_flag = 1; | |
2064 | ||
2065 | darwin_attach_pid (inf); | |
2066 | ||
2067 | darwin_suspend_inferior (inf); | |
2068 | ||
2069 | init_thread_list (inf); | |
2070 | ||
2071 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2072 | ||
2073 | darwin_check_osabi (priv, inferior_ptid.tid ()); | |
2074 | ||
2075 | darwin_setup_fake_stop_event (inf); | |
2076 | ||
2077 | priv->no_ptrace = 1; | |
2078 | } | |
2079 | ||
2080 | /* Take a program previously attached to and detaches it. | |
2081 | The program resumes execution and will no longer stop | |
2082 | on signals, etc. We'd better not have left any breakpoints | |
2083 | in the program or it'll die when it hits one. For this | |
2084 | to work, it may be necessary for the process to have been | |
2085 | previously attached. It *might* work if the program was | |
2086 | started via fork. */ | |
2087 | ||
2088 | void | |
2089 | darwin_nat_target::detach (inferior *inf, int from_tty) | |
2090 | { | |
2091 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2092 | kern_return_t kret; | |
2093 | int res; | |
2094 | ||
2095 | /* Display message. */ | |
2096 | target_announce_detach (from_tty); | |
2097 | ||
2098 | /* If ptrace() is in use, stop the process. */ | |
2099 | if (!priv->no_ptrace) | |
2100 | stop_inferior (inf); | |
2101 | ||
2102 | kret = darwin_restore_exception_ports (priv); | |
2103 | MACH_CHECK_ERROR (kret); | |
2104 | ||
2105 | if (!priv->no_ptrace) | |
2106 | { | |
2107 | res = PTRACE (PT_DETACH, inf->pid, 0, 0); | |
2108 | if (res != 0) | |
2109 | printf_unfiltered (_("Unable to detach from process-id %d: %s (%d)"), | |
2110 | inf->pid, safe_strerror (errno), errno); | |
2111 | } | |
2112 | ||
2113 | darwin_reply_to_all_pending_messages (inf); | |
2114 | ||
2115 | /* When using ptrace, we have just performed a PT_DETACH, which | |
2116 | resumes the inferior. On the other hand, when we are not using | |
2117 | ptrace, we need to resume its execution ourselves. */ | |
2118 | if (priv->no_ptrace) | |
2119 | darwin_resume_inferior (inf); | |
2120 | ||
2121 | mourn_inferior (); | |
2122 | } | |
2123 | ||
2124 | std::string | |
2125 | darwin_nat_target::pid_to_str (ptid_t ptid) | |
2126 | { | |
2127 | long tid = ptid.tid (); | |
2128 | ||
2129 | if (tid != 0) | |
2130 | return string_printf (_("Thread 0x%lx of process %u"), | |
2131 | tid, ptid.pid ()); | |
2132 | ||
2133 | return normal_pid_to_str (ptid); | |
2134 | } | |
2135 | ||
2136 | bool | |
2137 | darwin_nat_target::thread_alive (ptid_t ptid) | |
2138 | { | |
2139 | return true; | |
2140 | } | |
2141 | ||
2142 | /* If RDADDR is not NULL, read inferior task's LEN bytes from ADDR and | |
2143 | copy it to RDADDR in gdb's address space. | |
2144 | If WRADDR is not NULL, write gdb's LEN bytes from WRADDR and copy it | |
2145 | to ADDR in inferior task's address space. | |
2146 | Return 0 on failure; number of bytes read / written otherwise. */ | |
2147 | ||
2148 | static int | |
2149 | darwin_read_write_inferior (task_t task, CORE_ADDR addr, | |
2150 | gdb_byte *rdaddr, const gdb_byte *wraddr, | |
2151 | ULONGEST length) | |
2152 | { | |
2153 | kern_return_t kret; | |
2154 | mach_vm_size_t res_length = 0; | |
2155 | ||
2156 | inferior_debug (8, _("darwin_read_write_inferior(task=0x%x, %s, len=%s)\n"), | |
2157 | task, core_addr_to_string (addr), pulongest (length)); | |
2158 | ||
2159 | /* First read. */ | |
2160 | if (rdaddr != NULL) | |
2161 | { | |
2162 | mach_vm_size_t count; | |
2163 | ||
2164 | /* According to target.h(to_xfer_partial), one and only one may be | |
2165 | non-null. */ | |
2166 | gdb_assert (wraddr == NULL); | |
2167 | ||
2168 | kret = mach_vm_read_overwrite (task, addr, length, | |
2169 | (mach_vm_address_t) rdaddr, &count); | |
2170 | if (kret != KERN_SUCCESS) | |
2171 | { | |
2172 | inferior_debug | |
2173 | (1, _("darwin_read_write_inferior: mach_vm_read failed at %s: %s"), | |
2174 | core_addr_to_string (addr), mach_error_string (kret)); | |
2175 | return 0; | |
2176 | } | |
2177 | return count; | |
2178 | } | |
2179 | ||
2180 | /* See above. */ | |
2181 | gdb_assert (wraddr != NULL); | |
2182 | ||
2183 | while (length != 0) | |
2184 | { | |
2185 | mach_vm_address_t offset = addr & (mach_page_size - 1); | |
2186 | mach_vm_address_t region_address = (mach_vm_address_t) (addr - offset); | |
2187 | mach_vm_size_t aligned_length = | |
2188 | (mach_vm_size_t) PAGE_ROUND (offset + length); | |
2189 | vm_region_submap_short_info_data_64_t info; | |
2190 | mach_msg_type_number_t count = VM_REGION_SUBMAP_SHORT_INFO_COUNT_64; | |
2191 | natural_t region_depth = 1000; | |
2192 | mach_vm_address_t region_start = region_address; | |
2193 | mach_vm_size_t region_length; | |
2194 | mach_vm_size_t write_length; | |
2195 | ||
2196 | /* Read page protection. */ | |
2197 | kret = mach_vm_region_recurse | |
2198 | (task, ®ion_start, ®ion_length, ®ion_depth, | |
2199 | (vm_region_recurse_info_t) &info, &count); | |
2200 | ||
2201 | if (kret != KERN_SUCCESS) | |
2202 | { | |
2203 | inferior_debug (1, _("darwin_read_write_inferior: " | |
2204 | "mach_vm_region_recurse failed at %s: %s\n"), | |
2205 | core_addr_to_string (region_address), | |
2206 | mach_error_string (kret)); | |
2207 | return res_length; | |
2208 | } | |
2209 | ||
2210 | inferior_debug | |
2211 | (9, _("darwin_read_write_inferior: " | |
2212 | "mach_vm_region_recurse addr=%s, start=%s, len=%s\n"), | |
2213 | core_addr_to_string (region_address), | |
2214 | core_addr_to_string (region_start), | |
2215 | core_addr_to_string (region_length)); | |
2216 | ||
2217 | /* Check for holes in memory. */ | |
2218 | if (region_start > region_address) | |
2219 | { | |
2220 | warning (_("No memory at %s (vs %s+0x%x). Nothing written"), | |
2221 | core_addr_to_string (region_address), | |
2222 | core_addr_to_string (region_start), | |
2223 | (unsigned)region_length); | |
2224 | return res_length; | |
2225 | } | |
2226 | ||
2227 | /* Adjust the length. */ | |
2228 | region_length -= (region_address - region_start); | |
2229 | if (region_length > aligned_length) | |
2230 | region_length = aligned_length; | |
2231 | ||
2232 | /* Make the pages RW. */ | |
2233 | if (!(info.protection & VM_PROT_WRITE)) | |
2234 | { | |
2235 | vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE; | |
2236 | ||
2237 | kret = mach_vm_protect (task, region_address, region_length, | |
2238 | FALSE, prot); | |
2239 | if (kret != KERN_SUCCESS) | |
2240 | { | |
2241 | prot |= VM_PROT_COPY; | |
2242 | kret = mach_vm_protect (task, region_address, region_length, | |
2243 | FALSE, prot); | |
2244 | } | |
2245 | if (kret != KERN_SUCCESS) | |
2246 | { | |
2247 | warning (_("darwin_read_write_inferior: " | |
2248 | "mach_vm_protect failed at %s " | |
2249 | "(len=0x%lx, prot=0x%x): %s"), | |
2250 | core_addr_to_string (region_address), | |
2251 | (unsigned long) region_length, (unsigned) prot, | |
2252 | mach_error_string (kret)); | |
2253 | return res_length; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | if (offset + length > region_length) | |
2258 | write_length = region_length - offset; | |
2259 | else | |
2260 | write_length = length; | |
2261 | ||
2262 | /* Write. */ | |
2263 | kret = mach_vm_write (task, addr, (vm_offset_t) wraddr, write_length); | |
2264 | if (kret != KERN_SUCCESS) | |
2265 | { | |
2266 | warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"), | |
2267 | mach_error_string (kret)); | |
2268 | return res_length; | |
2269 | } | |
2270 | ||
2271 | /* Restore page rights. */ | |
2272 | if (!(info.protection & VM_PROT_WRITE)) | |
2273 | { | |
2274 | kret = mach_vm_protect (task, region_address, region_length, | |
2275 | FALSE, info.protection); | |
2276 | if (kret != KERN_SUCCESS) | |
2277 | { | |
2278 | warning (_("darwin_read_write_inferior: " | |
2279 | "mach_vm_protect restore failed at %s " | |
2280 | "(len=0x%lx): %s"), | |
2281 | core_addr_to_string (region_address), | |
2282 | (unsigned long) region_length, | |
2283 | mach_error_string (kret)); | |
2284 | } | |
2285 | } | |
2286 | ||
2287 | addr += write_length; | |
2288 | wraddr += write_length; | |
2289 | res_length += write_length; | |
2290 | length -= write_length; | |
2291 | } | |
2292 | ||
2293 | return res_length; | |
2294 | } | |
2295 | ||
2296 | /* Read LENGTH bytes at offset ADDR of task_dyld_info for TASK, and copy them | |
2297 | to RDADDR (in big endian). | |
2298 | Return 0 on failure; number of bytes read / written otherwise. */ | |
2299 | ||
2300 | #ifdef TASK_DYLD_INFO_COUNT | |
2301 | /* This is not available in Darwin 9. */ | |
2302 | static enum target_xfer_status | |
2303 | darwin_read_dyld_info (task_t task, CORE_ADDR addr, gdb_byte *rdaddr, | |
2304 | ULONGEST length, ULONGEST *xfered_len) | |
2305 | { | |
2306 | struct task_dyld_info task_dyld_info; | |
2307 | mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT; | |
2308 | kern_return_t kret; | |
2309 | ||
2310 | if (addr != 0 || length > sizeof (mach_vm_address_t)) | |
2311 | return TARGET_XFER_EOF; | |
2312 | ||
2313 | kret = task_info (task, TASK_DYLD_INFO, | |
2314 | (task_info_t) &task_dyld_info, &count); | |
2315 | MACH_CHECK_ERROR (kret); | |
2316 | if (kret != KERN_SUCCESS) | |
2317 | return TARGET_XFER_E_IO; | |
2318 | ||
2319 | store_unsigned_integer (rdaddr, length, BFD_ENDIAN_BIG, | |
2320 | task_dyld_info.all_image_info_addr); | |
2321 | *xfered_len = (ULONGEST) length; | |
2322 | return TARGET_XFER_OK; | |
2323 | } | |
2324 | #endif | |
2325 | ||
2326 | \f | |
2327 | ||
2328 | enum target_xfer_status | |
2329 | darwin_nat_target::xfer_partial (enum target_object object, const char *annex, | |
2330 | gdb_byte *readbuf, const gdb_byte *writebuf, | |
2331 | ULONGEST offset, ULONGEST len, | |
2332 | ULONGEST *xfered_len) | |
2333 | { | |
2334 | struct inferior *inf = current_inferior (); | |
2335 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2336 | ||
2337 | inferior_debug | |
2338 | (8, _("darwin_xfer_partial(%s, %s, rbuf=%s, wbuf=%s) pid=%u\n"), | |
2339 | core_addr_to_string (offset), pulongest (len), | |
2340 | host_address_to_string (readbuf), host_address_to_string (writebuf), | |
2341 | inf->pid); | |
2342 | ||
2343 | switch (object) | |
2344 | { | |
2345 | case TARGET_OBJECT_MEMORY: | |
2346 | { | |
2347 | int l = darwin_read_write_inferior (priv->task, offset, | |
2348 | readbuf, writebuf, len); | |
2349 | ||
2350 | if (l == 0) | |
2351 | return TARGET_XFER_EOF; | |
2352 | else | |
2353 | { | |
2354 | gdb_assert (l > 0); | |
2355 | *xfered_len = (ULONGEST) l; | |
2356 | return TARGET_XFER_OK; | |
2357 | } | |
2358 | } | |
2359 | #ifdef TASK_DYLD_INFO_COUNT | |
2360 | case TARGET_OBJECT_DARWIN_DYLD_INFO: | |
2361 | if (writebuf != NULL || readbuf == NULL) | |
2362 | { | |
2363 | /* Support only read. */ | |
2364 | return TARGET_XFER_E_IO; | |
2365 | } | |
2366 | return darwin_read_dyld_info (priv->task, offset, readbuf, len, | |
2367 | xfered_len); | |
2368 | #endif | |
2369 | default: | |
2370 | return TARGET_XFER_E_IO; | |
2371 | } | |
2372 | ||
2373 | } | |
2374 | ||
2375 | static void | |
2376 | set_enable_mach_exceptions (const char *args, int from_tty, | |
2377 | struct cmd_list_element *c) | |
2378 | { | |
2379 | if (inferior_ptid != null_ptid) | |
2380 | { | |
2381 | struct inferior *inf = current_inferior (); | |
2382 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2383 | exception_mask_t mask; | |
2384 | kern_return_t kret; | |
2385 | ||
2386 | if (enable_mach_exceptions) | |
2387 | mask = EXC_MASK_ALL; | |
2388 | else | |
2389 | { | |
2390 | darwin_restore_exception_ports (priv); | |
2391 | mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT; | |
2392 | } | |
2393 | kret = task_set_exception_ports (priv->task, mask, darwin_ex_port, | |
2394 | EXCEPTION_DEFAULT, THREAD_STATE_NONE); | |
2395 | MACH_CHECK_ERROR (kret); | |
2396 | } | |
2397 | } | |
2398 | ||
2399 | char * | |
2400 | darwin_nat_target::pid_to_exec_file (int pid) | |
2401 | { | |
2402 | static char path[PATH_MAX]; | |
2403 | int res; | |
2404 | ||
2405 | res = proc_pidinfo (pid, PROC_PIDPATHINFO, 0, path, PATH_MAX); | |
2406 | if (res >= 0) | |
2407 | return path; | |
2408 | else | |
2409 | return NULL; | |
2410 | } | |
2411 | ||
2412 | ptid_t | |
2413 | darwin_nat_target::get_ada_task_ptid (long lwp, long thread) | |
2414 | { | |
2415 | struct inferior *inf = current_inferior (); | |
2416 | darwin_inferior *priv = get_darwin_inferior (inf); | |
2417 | kern_return_t kret; | |
2418 | mach_port_name_array_t names; | |
2419 | mach_msg_type_number_t names_count; | |
2420 | mach_port_type_array_t types; | |
2421 | mach_msg_type_number_t types_count; | |
2422 | long res = 0; | |
2423 | ||
2424 | /* First linear search. */ | |
2425 | for (darwin_thread_t *t : priv->threads) | |
2426 | { | |
2427 | if (t->inf_port == lwp) | |
2428 | return ptid_t (inferior_ptid.pid (), 0, t->gdb_port); | |
2429 | } | |
2430 | ||
2431 | /* Maybe the port was never extract. Do it now. */ | |
2432 | ||
2433 | /* First get inferior port names. */ | |
2434 | kret = mach_port_names (priv->task, &names, &names_count, &types, | |
2435 | &types_count); | |
2436 | MACH_CHECK_ERROR (kret); | |
2437 | if (kret != KERN_SUCCESS) | |
2438 | return null_ptid; | |
2439 | ||
2440 | /* For each name, copy the right in the gdb space and then compare with | |
2441 | our view of the inferior threads. We don't forget to deallocate the | |
2442 | right. */ | |
2443 | for (int i = 0; i < names_count; i++) | |
2444 | { | |
2445 | mach_port_t local_name; | |
2446 | mach_msg_type_name_t local_type; | |
2447 | ||
2448 | /* We just need to know the corresponding name in gdb name space. | |
2449 | So extract and deallocate the right. */ | |
2450 | kret = mach_port_extract_right (priv->task, names[i], | |
2451 | MACH_MSG_TYPE_COPY_SEND, | |
2452 | &local_name, &local_type); | |
2453 | if (kret != KERN_SUCCESS) | |
2454 | continue; | |
2455 | mach_port_deallocate (gdb_task, local_name); | |
2456 | ||
2457 | for (darwin_thread_t *t : priv->threads) | |
2458 | { | |
2459 | if (t->gdb_port == local_name) | |
2460 | { | |
2461 | t->inf_port = names[i]; | |
2462 | if (names[i] == lwp) | |
2463 | res = t->gdb_port; | |
2464 | } | |
2465 | } | |
2466 | } | |
2467 | ||
2468 | vm_deallocate (gdb_task, (vm_address_t) names, | |
2469 | names_count * sizeof (mach_port_t)); | |
2470 | ||
2471 | if (res) | |
2472 | return ptid_t (inferior_ptid.pid (), 0, res); | |
2473 | else | |
2474 | return null_ptid; | |
2475 | } | |
2476 | ||
2477 | bool | |
2478 | darwin_nat_target::supports_multi_process () | |
2479 | { | |
2480 | return true; | |
2481 | } | |
2482 | ||
2483 | void _initialize_darwin_nat (); | |
2484 | void | |
2485 | _initialize_darwin_nat () | |
2486 | { | |
2487 | kern_return_t kret; | |
2488 | ||
2489 | gdb_task = mach_task_self (); | |
2490 | darwin_host_self = mach_host_self (); | |
2491 | ||
2492 | /* Read page size. */ | |
2493 | kret = host_page_size (darwin_host_self, &mach_page_size); | |
2494 | if (kret != KERN_SUCCESS) | |
2495 | { | |
2496 | mach_page_size = 0x1000; | |
2497 | MACH_CHECK_ERROR (kret); | |
2498 | } | |
2499 | ||
2500 | inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), | |
2501 | (unsigned long) mach_task_self (), getpid ()); | |
2502 | ||
2503 | add_setshow_zuinteger_cmd ("darwin", class_obscure, | |
2504 | &darwin_debug_flag, _("\ | |
2505 | Set if printing inferior communication debugging statements."), _("\ | |
2506 | Show if printing inferior communication debugging statements."), NULL, | |
2507 | NULL, NULL, | |
2508 | &setdebuglist, &showdebuglist); | |
2509 | ||
2510 | add_setshow_boolean_cmd ("mach-exceptions", class_support, | |
2511 | &enable_mach_exceptions, _("\ | |
2512 | Set if mach exceptions are caught."), _("\ | |
2513 | Show if mach exceptions are caught."), _("\ | |
2514 | When this mode is on, all low level exceptions are reported before being\n\ | |
2515 | reported by the kernel."), | |
2516 | &set_enable_mach_exceptions, NULL, | |
2517 | &setlist, &showlist); | |
2518 | } |