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