| 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 ptid_t darwin_wait (ptid_t ptid, struct target_waitstatus *status); |
| 93 | |
| 94 | static void darwin_ptrace_me (void); |
| 95 | |
| 96 | static void darwin_ptrace_him (int pid); |
| 97 | |
| 98 | static void darwin_encode_reply (mig_reply_error_t *reply, |
| 99 | mach_msg_header_t *hdr, integer_t code); |
| 100 | |
| 101 | static void darwin_setup_request_notification (struct inferior *inf); |
| 102 | static void darwin_deallocate_exception_ports (darwin_inferior *inf); |
| 103 | static void darwin_setup_exceptions (struct inferior *inf); |
| 104 | static void darwin_deallocate_threads (struct inferior *inf); |
| 105 | |
| 106 | /* Task identifier of gdb. */ |
| 107 | static task_t gdb_task; |
| 108 | |
| 109 | /* A copy of mach_host_self (). */ |
| 110 | mach_port_t darwin_host_self; |
| 111 | |
| 112 | /* Exception port. */ |
| 113 | mach_port_t darwin_ex_port; |
| 114 | |
| 115 | /* Port set, to wait for answer on all ports. */ |
| 116 | mach_port_t darwin_port_set; |
| 117 | |
| 118 | /* Page size. */ |
| 119 | static vm_size_t mach_page_size; |
| 120 | |
| 121 | /* If Set, catch all mach exceptions (before they are converted to signals |
| 122 | by the kernel). */ |
| 123 | static bool enable_mach_exceptions; |
| 124 | |
| 125 | /* Inferior that should report a fake stop event. */ |
| 126 | static struct inferior *darwin_inf_fake_stop; |
| 127 | |
| 128 | /* If non-NULL, the shell we actually invoke. See maybe_cache_shell |
| 129 | for details. */ |
| 130 | static const char *copied_shell; |
| 131 | |
| 132 | #define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1)) |
| 133 | #define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1) |
| 134 | |
| 135 | /* This controls output of inferior debugging. */ |
| 136 | static unsigned int darwin_debug_flag = 0; |
| 137 | |
| 138 | /* Create a __TEXT __info_plist section in the executable so that gdb could |
| 139 | be signed. This is required to get an authorization for task_for_pid. |
| 140 | |
| 141 | Once gdb is built, you must codesign it with any system-trusted signing |
| 142 | authority. See taskgated(8) for details. */ |
| 143 | static const unsigned char info_plist[] |
| 144 | __attribute__ ((section ("__TEXT,__info_plist"),used)) = |
| 145 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" |
| 146 | "<!DOCTYPE plist PUBLIC \"-//Apple Computer//DTD PLIST 1.0//EN\"" |
| 147 | " \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n" |
| 148 | "<plist version=\"1.0\">\n" |
| 149 | "<dict>\n" |
| 150 | " <key>CFBundleIdentifier</key>\n" |
| 151 | " <string>org.gnu.gdb</string>\n" |
| 152 | " <key>CFBundleName</key>\n" |
| 153 | " <string>gdb</string>\n" |
| 154 | " <key>CFBundleVersion</key>\n" |
| 155 | " <string>1.0</string>\n" |
| 156 | " <key>SecTaskAccess</key>\n" |
| 157 | " <array>\n" |
| 158 | " <string>allowed</string>\n" |
| 159 | " <string>debug</string>\n" |
| 160 | " </array>\n" |
| 161 | "</dict>\n" |
| 162 | "</plist>\n"; |
| 163 | |
| 164 | static void inferior_debug (int level, const char *fmt, ...) |
| 165 | ATTRIBUTE_PRINTF (2, 3); |
| 166 | |
| 167 | static void |
| 168 | inferior_debug (int level, const char *fmt, ...) |
| 169 | { |
| 170 | va_list ap; |
| 171 | |
| 172 | if (darwin_debug_flag < level) |
| 173 | return; |
| 174 | |
| 175 | va_start (ap, fmt); |
| 176 | printf_unfiltered (_("[%d inferior]: "), getpid ()); |
| 177 | vprintf_unfiltered (fmt, ap); |
| 178 | va_end (ap); |
| 179 | } |
| 180 | |
| 181 | void |
| 182 | mach_check_error (kern_return_t ret, const char *file, |
| 183 | unsigned int line, const char *func) |
| 184 | { |
| 185 | if (ret == KERN_SUCCESS) |
| 186 | return; |
| 187 | if (func == NULL) |
| 188 | func = _("[UNKNOWN]"); |
| 189 | |
| 190 | warning (_("Mach error at \"%s:%u\" in function \"%s\": %s (0x%lx)"), |
| 191 | file, line, func, mach_error_string (ret), (unsigned long) ret); |
| 192 | } |
| 193 | |
| 194 | static const char * |
| 195 | unparse_exception_type (unsigned int i) |
| 196 | { |
| 197 | static char unknown_exception_buf[32]; |
| 198 | |
| 199 | switch (i) |
| 200 | { |
| 201 | case EXC_BAD_ACCESS: |
| 202 | return "EXC_BAD_ACCESS"; |
| 203 | case EXC_BAD_INSTRUCTION: |
| 204 | return "EXC_BAD_INSTRUCTION"; |
| 205 | case EXC_ARITHMETIC: |
| 206 | return "EXC_ARITHMETIC"; |
| 207 | case EXC_EMULATION: |
| 208 | return "EXC_EMULATION"; |
| 209 | case EXC_SOFTWARE: |
| 210 | return "EXC_SOFTWARE"; |
| 211 | case EXC_BREAKPOINT: |
| 212 | return "EXC_BREAKPOINT"; |
| 213 | case EXC_SYSCALL: |
| 214 | return "EXC_SYSCALL"; |
| 215 | case EXC_MACH_SYSCALL: |
| 216 | return "EXC_MACH_SYSCALL"; |
| 217 | case EXC_RPC_ALERT: |
| 218 | return "EXC_RPC_ALERT"; |
| 219 | case EXC_CRASH: |
| 220 | return "EXC_CRASH"; |
| 221 | default: |
| 222 | snprintf (unknown_exception_buf, 32, _("unknown (%d)"), i); |
| 223 | return unknown_exception_buf; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /* Set errno to zero, and then call ptrace with the given arguments. |
| 228 | If inferior debugging traces are on, then also print a debug |
| 229 | trace. |
| 230 | |
| 231 | The returned value is the same as the value returned by ptrace, |
| 232 | except in the case where that value is -1 but errno is zero. |
| 233 | This case is documented to be a non-error situation, so we |
| 234 | return zero in that case. */ |
| 235 | |
| 236 | static int |
| 237 | darwin_ptrace (const char *name, |
| 238 | int request, int pid, caddr_t arg3, int arg4) |
| 239 | { |
| 240 | int ret; |
| 241 | |
| 242 | errno = 0; |
| 243 | ret = ptrace (request, pid, arg3, arg4); |
| 244 | if (ret == -1 && errno == 0) |
| 245 | ret = 0; |
| 246 | |
| 247 | inferior_debug (4, _("ptrace (%s, %d, 0x%lx, %d): %d (%s)\n"), |
| 248 | name, pid, (unsigned long) arg3, arg4, ret, |
| 249 | (ret != 0) ? safe_strerror (errno) : _("no error")); |
| 250 | return ret; |
| 251 | } |
| 252 | |
| 253 | static int |
| 254 | cmp_thread_t (const void *l, const void *r) |
| 255 | { |
| 256 | thread_t tl = *(const thread_t *)l; |
| 257 | thread_t tr = *(const thread_t *)r; |
| 258 | return (int)(tl - tr); |
| 259 | } |
| 260 | |
| 261 | static void |
| 262 | darwin_check_new_threads (struct inferior *inf) |
| 263 | { |
| 264 | kern_return_t kret; |
| 265 | thread_array_t thread_list; |
| 266 | unsigned int new_nbr; |
| 267 | unsigned int old_nbr; |
| 268 | unsigned int new_ix, old_ix; |
| 269 | darwin_inferior *darwin_inf = get_darwin_inferior (inf); |
| 270 | std::vector<darwin_thread_t *> new_thread_vec; |
| 271 | |
| 272 | if (darwin_inf == nullptr) |
| 273 | return; |
| 274 | |
| 275 | /* Get list of threads. */ |
| 276 | kret = task_threads (darwin_inf->task, &thread_list, &new_nbr); |
| 277 | MACH_CHECK_ERROR (kret); |
| 278 | if (kret != KERN_SUCCESS) |
| 279 | return; |
| 280 | |
| 281 | /* Sort the list. */ |
| 282 | if (new_nbr > 1) |
| 283 | qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t); |
| 284 | |
| 285 | old_nbr = darwin_inf->threads.size (); |
| 286 | |
| 287 | /* Quick check for no changes. */ |
| 288 | if (old_nbr == new_nbr) |
| 289 | { |
| 290 | size_t i; |
| 291 | |
| 292 | for (i = 0; i < new_nbr; i++) |
| 293 | if (thread_list[i] != darwin_inf->threads[i]->gdb_port) |
| 294 | break; |
| 295 | if (i == new_nbr) |
| 296 | { |
| 297 | /* Deallocate ports. */ |
| 298 | for (i = 0; i < new_nbr; i++) |
| 299 | { |
| 300 | kret = mach_port_deallocate (mach_task_self (), thread_list[i]); |
| 301 | MACH_CHECK_ERROR (kret); |
| 302 | } |
| 303 | |
| 304 | /* Deallocate the buffer. */ |
| 305 | kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, |
| 306 | new_nbr * sizeof (int)); |
| 307 | MACH_CHECK_ERROR (kret); |
| 308 | |
| 309 | return; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | /* Full handling: detect new threads, remove dead threads. */ |
| 314 | |
| 315 | new_thread_vec.reserve (new_nbr); |
| 316 | |
| 317 | for (new_ix = 0, old_ix = 0; new_ix < new_nbr || old_ix < old_nbr;) |
| 318 | { |
| 319 | thread_t new_id = (new_ix < new_nbr) ? thread_list[new_ix] : THREAD_NULL; |
| 320 | darwin_thread_t *old |
| 321 | = (old_ix < old_nbr) ? darwin_inf->threads[old_ix] : NULL; |
| 322 | thread_t old_id = old != NULL ? old->gdb_port : THREAD_NULL; |
| 323 | |
| 324 | inferior_debug |
| 325 | (12, _(" new_ix:%d/%d, old_ix:%d/%d, new_id:0x%x old_id:0x%x\n"), |
| 326 | new_ix, new_nbr, old_ix, old_nbr, new_id, old_id); |
| 327 | |
| 328 | if (old_id == new_id) |
| 329 | { |
| 330 | /* Thread still exist. */ |
| 331 | new_thread_vec.push_back (old); |
| 332 | new_ix++; |
| 333 | old_ix++; |
| 334 | |
| 335 | /* Deallocate the port. */ |
| 336 | kret = mach_port_deallocate (gdb_task, new_id); |
| 337 | MACH_CHECK_ERROR (kret); |
| 338 | |
| 339 | continue; |
| 340 | } |
| 341 | if (new_ix < new_nbr && new_id == MACH_PORT_DEAD) |
| 342 | { |
| 343 | /* Ignore dead ports. |
| 344 | In some weird cases, we might get dead ports. They should |
| 345 | correspond to dead thread so they could safely be ignored. */ |
| 346 | new_ix++; |
| 347 | continue; |
| 348 | } |
| 349 | if (new_ix < new_nbr && (old_ix == old_nbr || new_id < old_id)) |
| 350 | { |
| 351 | /* A thread was created. */ |
| 352 | darwin_thread_info *pti = new darwin_thread_info; |
| 353 | |
| 354 | pti->gdb_port = new_id; |
| 355 | pti->msg_state = DARWIN_RUNNING; |
| 356 | |
| 357 | /* Add the new thread. */ |
| 358 | add_thread_with_info (ptid_t (inf->pid, 0, new_id), pti); |
| 359 | new_thread_vec.push_back (pti); |
| 360 | new_ix++; |
| 361 | continue; |
| 362 | } |
| 363 | if (old_ix < old_nbr && (new_ix == new_nbr || new_id > old_id)) |
| 364 | { |
| 365 | /* A thread was removed. */ |
| 366 | struct thread_info *thr |
| 367 | = find_thread_ptid (ptid_t (inf->pid, 0, old_id)); |
| 368 | delete_thread (thr); |
| 369 | kret = mach_port_deallocate (gdb_task, old_id); |
| 370 | MACH_CHECK_ERROR (kret); |
| 371 | old_ix++; |
| 372 | continue; |
| 373 | } |
| 374 | gdb_assert_not_reached ("unexpected thread case"); |
| 375 | } |
| 376 | |
| 377 | darwin_inf->threads = std::move (new_thread_vec); |
| 378 | |
| 379 | /* Deallocate the buffer. */ |
| 380 | kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, |
| 381 | new_nbr * sizeof (int)); |
| 382 | MACH_CHECK_ERROR (kret); |
| 383 | } |
| 384 | |
| 385 | static int |
| 386 | find_inferior_task_it (struct inferior *inf, void *port_ptr) |
| 387 | { |
| 388 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 389 | |
| 390 | return priv != nullptr && priv->task == *(task_t *)port_ptr; |
| 391 | } |
| 392 | |
| 393 | static int |
| 394 | find_inferior_pid_it (struct inferior *inf, void *pid_ptr) |
| 395 | { |
| 396 | return inf->pid == *(int *)pid_ptr; |
| 397 | } |
| 398 | |
| 399 | /* Return an inferior by task port. */ |
| 400 | static struct inferior * |
| 401 | darwin_find_inferior_by_task (task_t port) |
| 402 | { |
| 403 | return iterate_over_inferiors (&find_inferior_task_it, &port); |
| 404 | } |
| 405 | |
| 406 | /* Return an inferior by pid port. */ |
| 407 | static struct inferior * |
| 408 | darwin_find_inferior_by_pid (int pid) |
| 409 | { |
| 410 | return iterate_over_inferiors (&find_inferior_pid_it, &pid); |
| 411 | } |
| 412 | |
| 413 | /* Return a thread by port. */ |
| 414 | static darwin_thread_t * |
| 415 | darwin_find_thread (struct inferior *inf, thread_t thread) |
| 416 | { |
| 417 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 418 | |
| 419 | if (priv != nullptr) |
| 420 | for (darwin_thread_t *t : priv->threads) |
| 421 | { |
| 422 | if (t->gdb_port == thread) |
| 423 | return t; |
| 424 | } |
| 425 | |
| 426 | return NULL; |
| 427 | } |
| 428 | |
| 429 | /* Suspend (ie stop) an inferior at Mach level. */ |
| 430 | |
| 431 | static void |
| 432 | darwin_suspend_inferior (struct inferior *inf) |
| 433 | { |
| 434 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 435 | |
| 436 | if (priv != nullptr && !priv->suspended) |
| 437 | { |
| 438 | kern_return_t kret; |
| 439 | |
| 440 | kret = task_suspend (priv->task); |
| 441 | MACH_CHECK_ERROR (kret); |
| 442 | |
| 443 | priv->suspended = 1; |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | /* Resume an inferior at Mach level. */ |
| 448 | |
| 449 | static void |
| 450 | darwin_resume_inferior (struct inferior *inf) |
| 451 | { |
| 452 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 453 | |
| 454 | if (priv != nullptr && priv->suspended) |
| 455 | { |
| 456 | kern_return_t kret; |
| 457 | |
| 458 | kret = task_resume (priv->task); |
| 459 | MACH_CHECK_ERROR (kret); |
| 460 | |
| 461 | priv->suspended = 0; |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | /* Iterator functions. */ |
| 466 | |
| 467 | static int |
| 468 | darwin_suspend_inferior_it (struct inferior *inf, void *arg) |
| 469 | { |
| 470 | darwin_suspend_inferior (inf); |
| 471 | darwin_check_new_threads (inf); |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | static int |
| 476 | darwin_resume_inferior_it (struct inferior *inf, void *arg) |
| 477 | { |
| 478 | darwin_resume_inferior (inf); |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | static void |
| 483 | darwin_dump_message (mach_msg_header_t *hdr, int disp_body) |
| 484 | { |
| 485 | printf_unfiltered (_("message header:\n")); |
| 486 | printf_unfiltered (_(" bits: 0x%x\n"), hdr->msgh_bits); |
| 487 | printf_unfiltered (_(" size: 0x%x\n"), hdr->msgh_size); |
| 488 | printf_unfiltered (_(" remote-port: 0x%x\n"), hdr->msgh_remote_port); |
| 489 | printf_unfiltered (_(" local-port: 0x%x\n"), hdr->msgh_local_port); |
| 490 | printf_unfiltered (_(" reserved: 0x%x\n"), hdr->msgh_reserved); |
| 491 | printf_unfiltered (_(" id: 0x%x\n"), hdr->msgh_id); |
| 492 | |
| 493 | if (disp_body) |
| 494 | { |
| 495 | const unsigned char *data; |
| 496 | const unsigned int *ldata; |
| 497 | int size; |
| 498 | int i; |
| 499 | |
| 500 | data = (unsigned char *)(hdr + 1); |
| 501 | size = hdr->msgh_size - sizeof (mach_msg_header_t); |
| 502 | |
| 503 | if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX) |
| 504 | { |
| 505 | mach_msg_body_t *bod = (mach_msg_body_t*)data; |
| 506 | mach_msg_port_descriptor_t *desc = |
| 507 | (mach_msg_port_descriptor_t *)(bod + 1); |
| 508 | int k; |
| 509 | NDR_record_t *ndr; |
| 510 | printf_unfiltered (_("body: descriptor_count=%u\n"), |
| 511 | bod->msgh_descriptor_count); |
| 512 | data += sizeof (mach_msg_body_t); |
| 513 | size -= sizeof (mach_msg_body_t); |
| 514 | for (k = 0; k < bod->msgh_descriptor_count; k++) |
| 515 | switch (desc[k].type) |
| 516 | { |
| 517 | case MACH_MSG_PORT_DESCRIPTOR: |
| 518 | printf_unfiltered |
| 519 | (_(" descr %d: type=%u (port) name=0x%x, dispo=%d\n"), |
| 520 | k, desc[k].type, desc[k].name, desc[k].disposition); |
| 521 | break; |
| 522 | default: |
| 523 | printf_unfiltered (_(" descr %d: type=%u\n"), |
| 524 | k, desc[k].type); |
| 525 | break; |
| 526 | } |
| 527 | data += bod->msgh_descriptor_count |
| 528 | * sizeof (mach_msg_port_descriptor_t); |
| 529 | size -= bod->msgh_descriptor_count |
| 530 | * sizeof (mach_msg_port_descriptor_t); |
| 531 | ndr = (NDR_record_t *)(desc + bod->msgh_descriptor_count); |
| 532 | printf_unfiltered |
| 533 | (_("NDR: mig=%02x if=%02x encod=%02x " |
| 534 | "int=%02x char=%02x float=%02x\n"), |
| 535 | ndr->mig_vers, ndr->if_vers, ndr->mig_encoding, |
| 536 | ndr->int_rep, ndr->char_rep, ndr->float_rep); |
| 537 | data += sizeof (NDR_record_t); |
| 538 | size -= sizeof (NDR_record_t); |
| 539 | } |
| 540 | |
| 541 | printf_unfiltered (_(" data:")); |
| 542 | ldata = (const unsigned int *)data; |
| 543 | for (i = 0; i < size / sizeof (unsigned int); i++) |
| 544 | printf_unfiltered (" %08x", ldata[i]); |
| 545 | printf_unfiltered (_("\n")); |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | /* Adjust inferior data when a new task was created. */ |
| 550 | |
| 551 | static struct inferior * |
| 552 | darwin_find_new_inferior (task_t task_port, thread_t thread_port) |
| 553 | { |
| 554 | int task_pid; |
| 555 | struct inferior *inf; |
| 556 | kern_return_t kret; |
| 557 | mach_port_t prev; |
| 558 | |
| 559 | /* Find the corresponding pid. */ |
| 560 | kret = pid_for_task (task_port, &task_pid); |
| 561 | if (kret != KERN_SUCCESS) |
| 562 | { |
| 563 | MACH_CHECK_ERROR (kret); |
| 564 | return NULL; |
| 565 | } |
| 566 | |
| 567 | /* Find the inferior for this pid. */ |
| 568 | inf = darwin_find_inferior_by_pid (task_pid); |
| 569 | if (inf == NULL) |
| 570 | return NULL; |
| 571 | |
| 572 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 573 | |
| 574 | /* Deallocate saved exception ports. */ |
| 575 | darwin_deallocate_exception_ports (priv); |
| 576 | |
| 577 | /* No need to remove dead_name notification, but still... */ |
| 578 | kret = mach_port_request_notification (gdb_task, priv->task, |
| 579 | MACH_NOTIFY_DEAD_NAME, 0, |
| 580 | MACH_PORT_NULL, |
| 581 | MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| 582 | &prev); |
| 583 | if (kret != KERN_INVALID_ARGUMENT) |
| 584 | MACH_CHECK_ERROR (kret); |
| 585 | |
| 586 | /* Replace old task port. */ |
| 587 | kret = mach_port_deallocate (gdb_task, priv->task); |
| 588 | MACH_CHECK_ERROR (kret); |
| 589 | priv->task = task_port; |
| 590 | |
| 591 | darwin_setup_request_notification (inf); |
| 592 | darwin_setup_exceptions (inf); |
| 593 | |
| 594 | return inf; |
| 595 | } |
| 596 | |
| 597 | /* Check data representation. */ |
| 598 | |
| 599 | static int |
| 600 | darwin_check_message_ndr (NDR_record_t *ndr) |
| 601 | { |
| 602 | if (ndr->mig_vers != NDR_PROTOCOL_2_0 |
| 603 | || ndr->if_vers != NDR_PROTOCOL_2_0 |
| 604 | || ndr->mig_encoding != NDR_record.mig_encoding |
| 605 | || ndr->int_rep != NDR_record.int_rep |
| 606 | || ndr->char_rep != NDR_record.char_rep |
| 607 | || ndr->float_rep != NDR_record.float_rep) |
| 608 | return -1; |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | /* Decode an exception message. */ |
| 613 | |
| 614 | static int |
| 615 | darwin_decode_exception_message (mach_msg_header_t *hdr, |
| 616 | struct inferior **pinf, |
| 617 | darwin_thread_t **pthread) |
| 618 | { |
| 619 | mach_msg_body_t *bod = (mach_msg_body_t*)(hdr + 1); |
| 620 | mach_msg_port_descriptor_t *desc = (mach_msg_port_descriptor_t *)(bod + 1); |
| 621 | NDR_record_t *ndr; |
| 622 | integer_t *data; |
| 623 | struct inferior *inf; |
| 624 | darwin_thread_t *thread; |
| 625 | task_t task_port; |
| 626 | thread_t thread_port; |
| 627 | kern_return_t kret; |
| 628 | int i; |
| 629 | |
| 630 | /* Check message destination. */ |
| 631 | if (hdr->msgh_local_port != darwin_ex_port) |
| 632 | return -1; |
| 633 | |
| 634 | /* Check message header. */ |
| 635 | if (!(hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)) |
| 636 | return -1; |
| 637 | |
| 638 | /* Check descriptors. */ |
| 639 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc) |
| 640 | + sizeof (*ndr) + 2 * sizeof (integer_t)) |
| 641 | || bod->msgh_descriptor_count != 2 |
| 642 | || desc[0].type != MACH_MSG_PORT_DESCRIPTOR |
| 643 | || desc[0].disposition != MACH_MSG_TYPE_MOVE_SEND |
| 644 | || desc[1].type != MACH_MSG_PORT_DESCRIPTOR |
| 645 | || desc[1].disposition != MACH_MSG_TYPE_MOVE_SEND) |
| 646 | return -1; |
| 647 | |
| 648 | /* Check data representation. */ |
| 649 | ndr = (NDR_record_t *)(desc + 2); |
| 650 | if (darwin_check_message_ndr (ndr) != 0) |
| 651 | return -1; |
| 652 | |
| 653 | /* Ok, the hard work. */ |
| 654 | data = (integer_t *)(ndr + 1); |
| 655 | |
| 656 | task_port = desc[1].name; |
| 657 | thread_port = desc[0].name; |
| 658 | |
| 659 | /* Find process by port. */ |
| 660 | inf = darwin_find_inferior_by_task (task_port); |
| 661 | *pinf = inf; |
| 662 | |
| 663 | if (inf == NULL && data[0] == EXC_SOFTWARE && data[1] == 2 |
| 664 | && data[2] == EXC_SOFT_SIGNAL && data[3] == SIGTRAP) |
| 665 | { |
| 666 | /* Not a known inferior, but a sigtrap. This happens on darwin 16.1.0, |
| 667 | as a new Mach task is created when a process exec. */ |
| 668 | inf = darwin_find_new_inferior (task_port, thread_port); |
| 669 | *pinf = inf; |
| 670 | |
| 671 | if (inf == NULL) |
| 672 | { |
| 673 | /* Deallocate task_port, unless it was saved. */ |
| 674 | kret = mach_port_deallocate (mach_task_self (), task_port); |
| 675 | MACH_CHECK_ERROR (kret); |
| 676 | } |
| 677 | } |
| 678 | else |
| 679 | { |
| 680 | /* We got new rights to the task, get rid of it. Do not get rid of |
| 681 | thread right, as we will need it to find the thread. */ |
| 682 | kret = mach_port_deallocate (mach_task_self (), task_port); |
| 683 | MACH_CHECK_ERROR (kret); |
| 684 | } |
| 685 | |
| 686 | if (inf == NULL) |
| 687 | { |
| 688 | /* Not a known inferior. This could happen if the child fork, as |
| 689 | the created process will inherit its exception port. |
| 690 | FIXME: should the exception port be restored ? */ |
| 691 | mig_reply_error_t reply; |
| 692 | |
| 693 | inferior_debug |
| 694 | (4, _("darwin_decode_exception_message: unknown task 0x%x\n"), |
| 695 | task_port); |
| 696 | |
| 697 | /* Free thread port (we don't know it). */ |
| 698 | kret = mach_port_deallocate (mach_task_self (), thread_port); |
| 699 | MACH_CHECK_ERROR (kret); |
| 700 | |
| 701 | darwin_encode_reply (&reply, hdr, KERN_SUCCESS); |
| 702 | |
| 703 | kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT, |
| 704 | reply.Head.msgh_size, 0, |
| 705 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, |
| 706 | MACH_PORT_NULL); |
| 707 | MACH_CHECK_ERROR (kret); |
| 708 | |
| 709 | return 0; |
| 710 | } |
| 711 | |
| 712 | /* Find thread by port. */ |
| 713 | /* Check for new threads. Do it early so that the port in the exception |
| 714 | message can be deallocated. */ |
| 715 | darwin_check_new_threads (inf); |
| 716 | |
| 717 | /* Free the thread port (as gdb knows the thread, it has already has a right |
| 718 | for it, so this just decrement a reference counter). */ |
| 719 | kret = mach_port_deallocate (mach_task_self (), thread_port); |
| 720 | MACH_CHECK_ERROR (kret); |
| 721 | |
| 722 | thread = darwin_find_thread (inf, thread_port); |
| 723 | if (thread == NULL) |
| 724 | return -1; |
| 725 | *pthread = thread; |
| 726 | |
| 727 | /* The thread should be running. However we have observed cases where a |
| 728 | thread got a SIGTTIN message after being stopped. */ |
| 729 | gdb_assert (thread->msg_state != DARWIN_MESSAGE); |
| 730 | |
| 731 | /* Finish decoding. */ |
| 732 | thread->event.header = *hdr; |
| 733 | thread->event.thread_port = thread_port; |
| 734 | thread->event.task_port = task_port; |
| 735 | thread->event.ex_type = data[0]; |
| 736 | thread->event.data_count = data[1]; |
| 737 | |
| 738 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*bod) + 2 * sizeof (*desc) |
| 739 | + sizeof (*ndr) + 2 * sizeof (integer_t) |
| 740 | + data[1] * sizeof (integer_t))) |
| 741 | return -1; |
| 742 | for (i = 0; i < data[1]; i++) |
| 743 | thread->event.ex_data[i] = data[2 + i]; |
| 744 | |
| 745 | thread->msg_state = DARWIN_MESSAGE; |
| 746 | |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | /* Decode dead_name notify message. */ |
| 751 | |
| 752 | static int |
| 753 | darwin_decode_notify_message (mach_msg_header_t *hdr, struct inferior **pinf) |
| 754 | { |
| 755 | NDR_record_t *ndr = (NDR_record_t *)(hdr + 1); |
| 756 | integer_t *data = (integer_t *)(ndr + 1); |
| 757 | struct inferior *inf; |
| 758 | task_t task_port; |
| 759 | |
| 760 | /* Check message header. */ |
| 761 | if (hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX) |
| 762 | return -1; |
| 763 | |
| 764 | /* Check descriptors. */ |
| 765 | if (hdr->msgh_size < (sizeof (*hdr) + sizeof (*ndr) + sizeof (integer_t))) |
| 766 | return -2; |
| 767 | |
| 768 | /* Check data representation. */ |
| 769 | if (darwin_check_message_ndr (ndr) != 0) |
| 770 | return -3; |
| 771 | |
| 772 | task_port = data[0]; |
| 773 | |
| 774 | /* Find process by port. */ |
| 775 | inf = darwin_find_inferior_by_task (task_port); |
| 776 | *pinf = inf; |
| 777 | |
| 778 | /* Check message destination. */ |
| 779 | if (inf != NULL) |
| 780 | { |
| 781 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 782 | if (hdr->msgh_local_port != priv->notify_port) |
| 783 | return -4; |
| 784 | } |
| 785 | |
| 786 | return 0; |
| 787 | } |
| 788 | |
| 789 | static void |
| 790 | darwin_encode_reply (mig_reply_error_t *reply, mach_msg_header_t *hdr, |
| 791 | integer_t code) |
| 792 | { |
| 793 | mach_msg_header_t *rh = &reply->Head; |
| 794 | |
| 795 | rh->msgh_bits = MACH_MSGH_BITS (MACH_MSGH_BITS_REMOTE (hdr->msgh_bits), 0); |
| 796 | rh->msgh_remote_port = hdr->msgh_remote_port; |
| 797 | rh->msgh_size = (mach_msg_size_t) sizeof (mig_reply_error_t); |
| 798 | rh->msgh_local_port = MACH_PORT_NULL; |
| 799 | rh->msgh_id = hdr->msgh_id + 100; |
| 800 | |
| 801 | reply->NDR = NDR_record; |
| 802 | reply->RetCode = code; |
| 803 | } |
| 804 | |
| 805 | static void |
| 806 | darwin_send_reply (struct inferior *inf, darwin_thread_t *thread) |
| 807 | { |
| 808 | kern_return_t kret; |
| 809 | mig_reply_error_t reply; |
| 810 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 811 | |
| 812 | darwin_encode_reply (&reply, &thread->event.header, KERN_SUCCESS); |
| 813 | |
| 814 | kret = mach_msg (&reply.Head, MACH_SEND_MSG | MACH_SEND_INTERRUPT, |
| 815 | reply.Head.msgh_size, 0, |
| 816 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, |
| 817 | MACH_PORT_NULL); |
| 818 | MACH_CHECK_ERROR (kret); |
| 819 | |
| 820 | priv->pending_messages--; |
| 821 | } |
| 822 | |
| 823 | /* Wrapper around the __pthread_kill syscall. We use this instead of the |
| 824 | pthread_kill function to be able to send a signal to any kind of thread, |
| 825 | including GCD threads. */ |
| 826 | |
| 827 | static int |
| 828 | darwin_pthread_kill (darwin_thread_t *thread, int nsignal) |
| 829 | { |
| 830 | DIAGNOSTIC_PUSH; |
| 831 | DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS; |
| 832 | int res = syscall (SYS___pthread_kill, thread->gdb_port, nsignal); |
| 833 | DIAGNOSTIC_POP; |
| 834 | return res; |
| 835 | } |
| 836 | |
| 837 | static void |
| 838 | darwin_resume_thread (struct inferior *inf, darwin_thread_t *thread, |
| 839 | int step, int nsignal) |
| 840 | { |
| 841 | inferior_debug |
| 842 | (3, _("darwin_resume_thread: state=%d, thread=0x%x, step=%d nsignal=%d\n"), |
| 843 | thread->msg_state, thread->gdb_port, step, nsignal); |
| 844 | |
| 845 | switch (thread->msg_state) |
| 846 | { |
| 847 | case DARWIN_MESSAGE: |
| 848 | if (thread->event.ex_type == EXC_SOFTWARE |
| 849 | && thread->event.ex_data[0] == EXC_SOFT_SIGNAL) |
| 850 | { |
| 851 | /* Either deliver a new signal or cancel the signal received. */ |
| 852 | int res = PTRACE (PT_THUPDATE, inf->pid, |
| 853 | (caddr_t) (uintptr_t) thread->gdb_port, nsignal); |
| 854 | if (res < 0) |
| 855 | inferior_debug (1, _("ptrace THUP: res=%d\n"), res); |
| 856 | } |
| 857 | else if (nsignal) |
| 858 | { |
| 859 | /* Note: ptrace is allowed only if the process is stopped. |
| 860 | Directly send the signal to the thread. */ |
| 861 | int res = darwin_pthread_kill (thread, nsignal); |
| 862 | inferior_debug (4, _("darwin_resume_thread: kill 0x%x %d: %d\n"), |
| 863 | thread->gdb_port, nsignal, res); |
| 864 | thread->signaled = 1; |
| 865 | } |
| 866 | |
| 867 | /* Set or reset single step. */ |
| 868 | inferior_debug (4, _("darwin_set_sstep (thread=0x%x, enable=%d)\n"), |
| 869 | thread->gdb_port, step); |
| 870 | darwin_set_sstep (thread->gdb_port, step); |
| 871 | thread->single_step = step; |
| 872 | |
| 873 | darwin_send_reply (inf, thread); |
| 874 | thread->msg_state = DARWIN_RUNNING; |
| 875 | break; |
| 876 | |
| 877 | case DARWIN_RUNNING: |
| 878 | break; |
| 879 | |
| 880 | case DARWIN_STOPPED: |
| 881 | kern_return_t kret = thread_resume (thread->gdb_port); |
| 882 | MACH_CHECK_ERROR (kret); |
| 883 | |
| 884 | thread->msg_state = DARWIN_RUNNING; |
| 885 | break; |
| 886 | } |
| 887 | } |
| 888 | |
| 889 | /* Resume all threads of the inferior. */ |
| 890 | |
| 891 | static void |
| 892 | darwin_resume_inferior_threads (struct inferior *inf, int step, int nsignal) |
| 893 | { |
| 894 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 895 | |
| 896 | if (priv != nullptr) |
| 897 | for (darwin_thread_t *thread : priv->threads) |
| 898 | darwin_resume_thread (inf, thread, step, nsignal); |
| 899 | } |
| 900 | |
| 901 | struct resume_inferior_threads_param |
| 902 | { |
| 903 | int step; |
| 904 | int nsignal; |
| 905 | }; |
| 906 | |
| 907 | static int |
| 908 | darwin_resume_inferior_threads_it (struct inferior *inf, void *param) |
| 909 | { |
| 910 | int step = ((struct resume_inferior_threads_param *)param)->step; |
| 911 | int nsignal = ((struct resume_inferior_threads_param *)param)->nsignal; |
| 912 | |
| 913 | darwin_resume_inferior_threads (inf, step, nsignal); |
| 914 | |
| 915 | return 0; |
| 916 | } |
| 917 | |
| 918 | /* Suspend all threads of INF. */ |
| 919 | |
| 920 | static void |
| 921 | darwin_suspend_inferior_threads (struct inferior *inf) |
| 922 | { |
| 923 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 924 | |
| 925 | for (darwin_thread_t *thread : priv->threads) |
| 926 | { |
| 927 | switch (thread->msg_state) |
| 928 | { |
| 929 | case DARWIN_STOPPED: |
| 930 | case DARWIN_MESSAGE: |
| 931 | break; |
| 932 | case DARWIN_RUNNING: |
| 933 | { |
| 934 | kern_return_t kret = thread_suspend (thread->gdb_port); |
| 935 | MACH_CHECK_ERROR (kret); |
| 936 | thread->msg_state = DARWIN_STOPPED; |
| 937 | break; |
| 938 | } |
| 939 | } |
| 940 | } |
| 941 | } |
| 942 | |
| 943 | void |
| 944 | darwin_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal) |
| 945 | { |
| 946 | struct target_waitstatus status; |
| 947 | |
| 948 | int nsignal; |
| 949 | |
| 950 | inferior_debug |
| 951 | (2, _("darwin_resume: pid=%d, tid=0x%lx, step=%d, signal=%d\n"), |
| 952 | ptid.pid (), ptid.tid (), step, signal); |
| 953 | |
| 954 | if (signal == GDB_SIGNAL_0) |
| 955 | nsignal = 0; |
| 956 | else |
| 957 | nsignal = gdb_signal_to_host (signal); |
| 958 | |
| 959 | /* Don't try to single step all threads. */ |
| 960 | if (step) |
| 961 | ptid = inferior_ptid; |
| 962 | |
| 963 | /* minus_one_ptid is RESUME_ALL. */ |
| 964 | if (ptid == minus_one_ptid) |
| 965 | { |
| 966 | struct resume_inferior_threads_param param; |
| 967 | |
| 968 | param.nsignal = nsignal; |
| 969 | param.step = step; |
| 970 | |
| 971 | /* Resume threads. */ |
| 972 | iterate_over_inferiors (darwin_resume_inferior_threads_it, ¶m); |
| 973 | /* Resume tasks. */ |
| 974 | iterate_over_inferiors (darwin_resume_inferior_it, NULL); |
| 975 | } |
| 976 | else |
| 977 | { |
| 978 | struct inferior *inf = find_inferior_ptid (ptid); |
| 979 | long tid = ptid.tid (); |
| 980 | |
| 981 | /* Stop the inferior (should be useless). */ |
| 982 | darwin_suspend_inferior (inf); |
| 983 | |
| 984 | if (tid == 0) |
| 985 | darwin_resume_inferior_threads (inf, step, nsignal); |
| 986 | else |
| 987 | { |
| 988 | darwin_thread_t *thread; |
| 989 | |
| 990 | /* Suspend threads of the task. */ |
| 991 | darwin_suspend_inferior_threads (inf); |
| 992 | |
| 993 | /* Resume the selected thread. */ |
| 994 | thread = darwin_find_thread (inf, tid); |
| 995 | gdb_assert (thread); |
| 996 | darwin_resume_thread (inf, thread, step, nsignal); |
| 997 | } |
| 998 | |
| 999 | /* Resume the task. */ |
| 1000 | darwin_resume_inferior (inf); |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | static ptid_t |
| 1005 | darwin_decode_message (mach_msg_header_t *hdr, |
| 1006 | darwin_thread_t **pthread, |
| 1007 | struct inferior **pinf, |
| 1008 | struct target_waitstatus *status) |
| 1009 | { |
| 1010 | darwin_thread_t *thread; |
| 1011 | struct inferior *inf; |
| 1012 | |
| 1013 | /* Exception message. 2401 == 0x961 is exc. */ |
| 1014 | if (hdr->msgh_id == 2401) |
| 1015 | { |
| 1016 | int res; |
| 1017 | |
| 1018 | /* Decode message. */ |
| 1019 | res = darwin_decode_exception_message (hdr, &inf, &thread); |
| 1020 | |
| 1021 | if (res < 0) |
| 1022 | { |
| 1023 | /* Should not happen... */ |
| 1024 | printf_unfiltered |
| 1025 | (_("darwin_wait: ill-formatted message (id=0x%x)\n"), hdr->msgh_id); |
| 1026 | /* FIXME: send a failure reply? */ |
| 1027 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1028 | return minus_one_ptid; |
| 1029 | } |
| 1030 | if (inf == NULL) |
| 1031 | { |
| 1032 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1033 | return minus_one_ptid; |
| 1034 | } |
| 1035 | *pinf = inf; |
| 1036 | *pthread = thread; |
| 1037 | |
| 1038 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1039 | |
| 1040 | priv->pending_messages++; |
| 1041 | |
| 1042 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1043 | thread->msg_state = DARWIN_MESSAGE; |
| 1044 | |
| 1045 | inferior_debug (4, _("darwin_wait: thread=0x%x, got %s\n"), |
| 1046 | thread->gdb_port, |
| 1047 | unparse_exception_type (thread->event.ex_type)); |
| 1048 | |
| 1049 | switch (thread->event.ex_type) |
| 1050 | { |
| 1051 | case EXC_BAD_ACCESS: |
| 1052 | status->value.sig = GDB_EXC_BAD_ACCESS; |
| 1053 | break; |
| 1054 | case EXC_BAD_INSTRUCTION: |
| 1055 | status->value.sig = GDB_EXC_BAD_INSTRUCTION; |
| 1056 | break; |
| 1057 | case EXC_ARITHMETIC: |
| 1058 | status->value.sig = GDB_EXC_ARITHMETIC; |
| 1059 | break; |
| 1060 | case EXC_EMULATION: |
| 1061 | status->value.sig = GDB_EXC_EMULATION; |
| 1062 | break; |
| 1063 | case EXC_SOFTWARE: |
| 1064 | if (thread->event.ex_data[0] == EXC_SOFT_SIGNAL) |
| 1065 | { |
| 1066 | status->value.sig = |
| 1067 | gdb_signal_from_host (thread->event.ex_data[1]); |
| 1068 | inferior_debug (5, _(" (signal %d: %s)\n"), |
| 1069 | thread->event.ex_data[1], |
| 1070 | gdb_signal_to_name (status->value.sig)); |
| 1071 | |
| 1072 | /* If the thread is stopped because it has received a signal |
| 1073 | that gdb has just sent, continue. */ |
| 1074 | if (thread->signaled) |
| 1075 | { |
| 1076 | thread->signaled = 0; |
| 1077 | darwin_send_reply (inf, thread); |
| 1078 | thread->msg_state = DARWIN_RUNNING; |
| 1079 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1080 | } |
| 1081 | } |
| 1082 | else |
| 1083 | status->value.sig = GDB_EXC_SOFTWARE; |
| 1084 | break; |
| 1085 | case EXC_BREAKPOINT: |
| 1086 | /* Many internal GDB routines expect breakpoints to be reported |
| 1087 | as GDB_SIGNAL_TRAP, and will report GDB_EXC_BREAKPOINT |
| 1088 | as a spurious signal. */ |
| 1089 | status->value.sig = GDB_SIGNAL_TRAP; |
| 1090 | break; |
| 1091 | default: |
| 1092 | status->value.sig = GDB_SIGNAL_UNKNOWN; |
| 1093 | break; |
| 1094 | } |
| 1095 | |
| 1096 | return ptid_t (inf->pid, 0, thread->gdb_port); |
| 1097 | } |
| 1098 | else if (hdr->msgh_id == 0x48) |
| 1099 | { |
| 1100 | /* MACH_NOTIFY_DEAD_NAME: notification for exit. */ |
| 1101 | int res; |
| 1102 | |
| 1103 | res = darwin_decode_notify_message (hdr, &inf); |
| 1104 | |
| 1105 | if (res < 0) |
| 1106 | { |
| 1107 | /* Should not happen... */ |
| 1108 | printf_unfiltered |
| 1109 | (_("darwin_wait: ill-formatted message (id=0x%x, res=%d)\n"), |
| 1110 | hdr->msgh_id, res); |
| 1111 | } |
| 1112 | |
| 1113 | *pinf = NULL; |
| 1114 | *pthread = NULL; |
| 1115 | |
| 1116 | if (res < 0 || inf == NULL) |
| 1117 | { |
| 1118 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1119 | return minus_one_ptid; |
| 1120 | } |
| 1121 | |
| 1122 | if (inf != NULL) |
| 1123 | { |
| 1124 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1125 | |
| 1126 | if (!priv->no_ptrace) |
| 1127 | { |
| 1128 | pid_t res_pid; |
| 1129 | int wstatus; |
| 1130 | |
| 1131 | res_pid = wait4 (inf->pid, &wstatus, 0, NULL); |
| 1132 | if (res_pid < 0 || res_pid != inf->pid) |
| 1133 | { |
| 1134 | printf_unfiltered (_("wait4: res=%d: %s\n"), |
| 1135 | res_pid, safe_strerror (errno)); |
| 1136 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1137 | return minus_one_ptid; |
| 1138 | } |
| 1139 | if (WIFEXITED (wstatus)) |
| 1140 | { |
| 1141 | status->kind = TARGET_WAITKIND_EXITED; |
| 1142 | status->value.integer = WEXITSTATUS (wstatus); |
| 1143 | } |
| 1144 | else |
| 1145 | { |
| 1146 | status->kind = TARGET_WAITKIND_SIGNALLED; |
| 1147 | status->value.sig = gdb_signal_from_host (WTERMSIG (wstatus)); |
| 1148 | } |
| 1149 | |
| 1150 | inferior_debug (4, _("darwin_wait: pid=%d exit, status=0x%x\n"), |
| 1151 | res_pid, wstatus); |
| 1152 | |
| 1153 | /* Looks necessary on Leopard and harmless... */ |
| 1154 | wait4 (inf->pid, &wstatus, 0, NULL); |
| 1155 | |
| 1156 | inferior_ptid = ptid_t (inf->pid, 0, 0); |
| 1157 | return inferior_ptid; |
| 1158 | } |
| 1159 | else |
| 1160 | { |
| 1161 | inferior_debug (4, _("darwin_wait: pid=%d\n"), inf->pid); |
| 1162 | status->kind = TARGET_WAITKIND_EXITED; |
| 1163 | status->value.integer = 0; /* Don't know. */ |
| 1164 | return ptid_t (inf->pid, 0, 0); |
| 1165 | } |
| 1166 | } |
| 1167 | } |
| 1168 | |
| 1169 | /* Unknown message. */ |
| 1170 | warning (_("darwin: got unknown message, id: 0x%x"), hdr->msgh_id); |
| 1171 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1172 | return minus_one_ptid; |
| 1173 | } |
| 1174 | |
| 1175 | static int |
| 1176 | cancel_breakpoint (ptid_t ptid) |
| 1177 | { |
| 1178 | /* Arrange for a breakpoint to be hit again later. We will handle |
| 1179 | the current event, eventually we will resume this thread, and this |
| 1180 | breakpoint will trap again. |
| 1181 | |
| 1182 | If we do not do this, then we run the risk that the user will |
| 1183 | delete or disable the breakpoint, but the thread will have already |
| 1184 | tripped on it. */ |
| 1185 | |
| 1186 | struct regcache *regcache = get_thread_regcache (ptid); |
| 1187 | struct gdbarch *gdbarch = regcache->arch (); |
| 1188 | CORE_ADDR pc; |
| 1189 | |
| 1190 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); |
| 1191 | if (breakpoint_inserted_here_p (regcache->aspace (), pc)) |
| 1192 | { |
| 1193 | inferior_debug (4, "cancel_breakpoint for thread 0x%lx\n", |
| 1194 | (unsigned long) ptid.tid ()); |
| 1195 | |
| 1196 | /* Back up the PC if necessary. */ |
| 1197 | if (gdbarch_decr_pc_after_break (gdbarch)) |
| 1198 | regcache_write_pc (regcache, pc); |
| 1199 | |
| 1200 | return 1; |
| 1201 | } |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
| 1205 | static ptid_t |
| 1206 | darwin_wait (ptid_t ptid, struct target_waitstatus *status) |
| 1207 | { |
| 1208 | kern_return_t kret; |
| 1209 | union |
| 1210 | { |
| 1211 | mach_msg_header_t hdr; |
| 1212 | char data[0x100]; |
| 1213 | } msgin; |
| 1214 | mach_msg_header_t *hdr = &msgin.hdr; |
| 1215 | ptid_t res; |
| 1216 | darwin_thread_t *thread; |
| 1217 | struct inferior *inf; |
| 1218 | |
| 1219 | inferior_debug |
| 1220 | (2, _("darwin_wait: waiting for a message pid=%d thread=%lx\n"), |
| 1221 | ptid.pid (), ptid.tid ()); |
| 1222 | |
| 1223 | /* Handle fake stop events at first. */ |
| 1224 | if (darwin_inf_fake_stop != NULL) |
| 1225 | { |
| 1226 | inf = darwin_inf_fake_stop; |
| 1227 | darwin_inf_fake_stop = NULL; |
| 1228 | |
| 1229 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1230 | |
| 1231 | status->kind = TARGET_WAITKIND_STOPPED; |
| 1232 | status->value.sig = GDB_SIGNAL_TRAP; |
| 1233 | thread = priv->threads[0]; |
| 1234 | thread->msg_state = DARWIN_STOPPED; |
| 1235 | return ptid_t (inf->pid, 0, thread->gdb_port); |
| 1236 | } |
| 1237 | |
| 1238 | do |
| 1239 | { |
| 1240 | /* set_sigint_trap (); */ |
| 1241 | |
| 1242 | /* Wait for a message. */ |
| 1243 | kret = mach_msg (&msgin.hdr, MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0, |
| 1244 | sizeof (msgin.data), darwin_port_set, 0, MACH_PORT_NULL); |
| 1245 | |
| 1246 | /* clear_sigint_trap (); */ |
| 1247 | |
| 1248 | if (kret == MACH_RCV_INTERRUPTED) |
| 1249 | { |
| 1250 | status->kind = TARGET_WAITKIND_IGNORE; |
| 1251 | return minus_one_ptid; |
| 1252 | } |
| 1253 | |
| 1254 | if (kret != MACH_MSG_SUCCESS) |
| 1255 | { |
| 1256 | inferior_debug (5, _("mach_msg: ret=0x%x\n"), kret); |
| 1257 | status->kind = TARGET_WAITKIND_SPURIOUS; |
| 1258 | return minus_one_ptid; |
| 1259 | } |
| 1260 | |
| 1261 | /* Debug: display message. */ |
| 1262 | if (darwin_debug_flag > 10) |
| 1263 | darwin_dump_message (hdr, darwin_debug_flag > 11); |
| 1264 | |
| 1265 | res = darwin_decode_message (hdr, &thread, &inf, status); |
| 1266 | if (res == minus_one_ptid) |
| 1267 | continue; |
| 1268 | |
| 1269 | /* Early return in case an inferior has exited. */ |
| 1270 | if (inf == NULL) |
| 1271 | return res; |
| 1272 | } |
| 1273 | while (status->kind == TARGET_WAITKIND_IGNORE); |
| 1274 | |
| 1275 | /* Stop all tasks. */ |
| 1276 | iterate_over_inferiors (darwin_suspend_inferior_it, NULL); |
| 1277 | |
| 1278 | /* Read pending messages. */ |
| 1279 | while (1) |
| 1280 | { |
| 1281 | struct target_waitstatus status2; |
| 1282 | ptid_t ptid2; |
| 1283 | |
| 1284 | kret = mach_msg (&msgin.hdr, |
| 1285 | MACH_RCV_MSG | MACH_RCV_TIMEOUT, 0, |
| 1286 | sizeof (msgin.data), darwin_port_set, 1, MACH_PORT_NULL); |
| 1287 | |
| 1288 | if (kret == MACH_RCV_TIMED_OUT) |
| 1289 | break; |
| 1290 | if (kret != MACH_MSG_SUCCESS) |
| 1291 | { |
| 1292 | inferior_debug |
| 1293 | (5, _("darwin_wait: mach_msg(pending) ret=0x%x\n"), kret); |
| 1294 | break; |
| 1295 | } |
| 1296 | |
| 1297 | /* Debug: display message. */ |
| 1298 | if (darwin_debug_flag > 10) |
| 1299 | darwin_dump_message (hdr, darwin_debug_flag > 11); |
| 1300 | |
| 1301 | ptid2 = darwin_decode_message (hdr, &thread, &inf, &status2); |
| 1302 | |
| 1303 | if (inf != NULL && thread != NULL |
| 1304 | && thread->event.ex_type == EXC_BREAKPOINT) |
| 1305 | { |
| 1306 | if (thread->single_step |
| 1307 | || cancel_breakpoint (ptid_t (inf->pid, 0, thread->gdb_port))) |
| 1308 | { |
| 1309 | gdb_assert (thread->msg_state == DARWIN_MESSAGE); |
| 1310 | darwin_send_reply (inf, thread); |
| 1311 | thread->msg_state = DARWIN_RUNNING; |
| 1312 | } |
| 1313 | else |
| 1314 | inferior_debug |
| 1315 | (3, _("darwin_wait: thread 0x%x hit a non-gdb breakpoint\n"), |
| 1316 | thread->gdb_port); |
| 1317 | } |
| 1318 | else |
| 1319 | inferior_debug (3, _("darwin_wait: unhandled pending message\n")); |
| 1320 | } |
| 1321 | return res; |
| 1322 | } |
| 1323 | |
| 1324 | ptid_t |
| 1325 | darwin_nat_target::wait (ptid_t ptid, struct target_waitstatus *status, |
| 1326 | int options) |
| 1327 | { |
| 1328 | return darwin_wait (ptid, status); |
| 1329 | } |
| 1330 | |
| 1331 | void |
| 1332 | darwin_nat_target::interrupt () |
| 1333 | { |
| 1334 | struct inferior *inf = current_inferior (); |
| 1335 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1336 | |
| 1337 | /* FIXME: handle in no_ptrace mode. */ |
| 1338 | gdb_assert (!priv->no_ptrace); |
| 1339 | ::kill (inf->pid, SIGINT); |
| 1340 | } |
| 1341 | |
| 1342 | /* Deallocate threads port and vector. */ |
| 1343 | |
| 1344 | static void |
| 1345 | darwin_deallocate_threads (struct inferior *inf) |
| 1346 | { |
| 1347 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1348 | |
| 1349 | for (darwin_thread_t *t : priv->threads) |
| 1350 | { |
| 1351 | kern_return_t kret = mach_port_deallocate (gdb_task, t->gdb_port); |
| 1352 | MACH_CHECK_ERROR (kret); |
| 1353 | } |
| 1354 | |
| 1355 | priv->threads.clear (); |
| 1356 | } |
| 1357 | |
| 1358 | void |
| 1359 | darwin_nat_target::mourn_inferior () |
| 1360 | { |
| 1361 | struct inferior *inf = current_inferior (); |
| 1362 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1363 | kern_return_t kret; |
| 1364 | mach_port_t prev; |
| 1365 | |
| 1366 | /* Deallocate threads. */ |
| 1367 | darwin_deallocate_threads (inf); |
| 1368 | |
| 1369 | /* Remove notify_port from darwin_port_set. */ |
| 1370 | kret = mach_port_move_member (gdb_task, |
| 1371 | priv->notify_port, MACH_PORT_NULL); |
| 1372 | MACH_CHECK_ERROR (kret); |
| 1373 | |
| 1374 | /* Remove task port dead_name notification. */ |
| 1375 | kret = mach_port_request_notification (gdb_task, priv->task, |
| 1376 | MACH_NOTIFY_DEAD_NAME, 0, |
| 1377 | MACH_PORT_NULL, |
| 1378 | MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| 1379 | &prev); |
| 1380 | /* This can fail if the task is dead. */ |
| 1381 | inferior_debug (4, "task=0x%x, prev=0x%x, notify_port=0x%x\n", |
| 1382 | priv->task, prev, priv->notify_port); |
| 1383 | |
| 1384 | if (kret == KERN_SUCCESS) |
| 1385 | { |
| 1386 | kret = mach_port_deallocate (gdb_task, prev); |
| 1387 | MACH_CHECK_ERROR (kret); |
| 1388 | } |
| 1389 | |
| 1390 | /* Destroy notify_port. */ |
| 1391 | kret = mach_port_destroy (gdb_task, priv->notify_port); |
| 1392 | MACH_CHECK_ERROR (kret); |
| 1393 | |
| 1394 | /* Deallocate saved exception ports. */ |
| 1395 | darwin_deallocate_exception_ports (priv); |
| 1396 | |
| 1397 | /* Deallocate task port. */ |
| 1398 | kret = mach_port_deallocate (gdb_task, priv->task); |
| 1399 | MACH_CHECK_ERROR (kret); |
| 1400 | |
| 1401 | inf->priv = NULL; |
| 1402 | |
| 1403 | inf_child_target::mourn_inferior (); |
| 1404 | } |
| 1405 | |
| 1406 | static void |
| 1407 | darwin_reply_to_all_pending_messages (struct inferior *inf) |
| 1408 | { |
| 1409 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1410 | |
| 1411 | for (darwin_thread_t *t : priv->threads) |
| 1412 | { |
| 1413 | if (t->msg_state == DARWIN_MESSAGE) |
| 1414 | darwin_resume_thread (inf, t, 0, 0); |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | static void |
| 1419 | darwin_stop_inferior (struct inferior *inf) |
| 1420 | { |
| 1421 | struct target_waitstatus wstatus; |
| 1422 | ptid_t ptid; |
| 1423 | int res; |
| 1424 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1425 | |
| 1426 | gdb_assert (inf != NULL); |
| 1427 | |
| 1428 | darwin_suspend_inferior (inf); |
| 1429 | |
| 1430 | darwin_reply_to_all_pending_messages (inf); |
| 1431 | |
| 1432 | if (priv->no_ptrace) |
| 1433 | return; |
| 1434 | |
| 1435 | res = kill (inf->pid, SIGSTOP); |
| 1436 | if (res != 0) |
| 1437 | warning (_("cannot kill: %s"), safe_strerror (errno)); |
| 1438 | |
| 1439 | /* Wait until the process is really stopped. */ |
| 1440 | while (1) |
| 1441 | { |
| 1442 | ptid = darwin_wait (inferior_ptid, &wstatus); |
| 1443 | if (wstatus.kind == TARGET_WAITKIND_STOPPED |
| 1444 | && wstatus.value.sig == GDB_SIGNAL_STOP) |
| 1445 | break; |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | static kern_return_t |
| 1450 | darwin_save_exception_ports (darwin_inferior *inf) |
| 1451 | { |
| 1452 | kern_return_t kret; |
| 1453 | |
| 1454 | inf->exception_info.count = |
| 1455 | sizeof (inf->exception_info.ports) / sizeof (inf->exception_info.ports[0]); |
| 1456 | |
| 1457 | kret = task_get_exception_ports |
| 1458 | (inf->task, EXC_MASK_ALL, inf->exception_info.masks, |
| 1459 | &inf->exception_info.count, inf->exception_info.ports, |
| 1460 | inf->exception_info.behaviors, inf->exception_info.flavors); |
| 1461 | return kret; |
| 1462 | } |
| 1463 | |
| 1464 | static kern_return_t |
| 1465 | darwin_restore_exception_ports (darwin_inferior *inf) |
| 1466 | { |
| 1467 | int i; |
| 1468 | kern_return_t kret; |
| 1469 | |
| 1470 | for (i = 0; i < inf->exception_info.count; i++) |
| 1471 | { |
| 1472 | kret = task_set_exception_ports |
| 1473 | (inf->task, inf->exception_info.masks[i], inf->exception_info.ports[i], |
| 1474 | inf->exception_info.behaviors[i], inf->exception_info.flavors[i]); |
| 1475 | if (kret != KERN_SUCCESS) |
| 1476 | return kret; |
| 1477 | } |
| 1478 | |
| 1479 | return KERN_SUCCESS; |
| 1480 | } |
| 1481 | |
| 1482 | /* Deallocate saved exception ports. */ |
| 1483 | |
| 1484 | static void |
| 1485 | darwin_deallocate_exception_ports (darwin_inferior *inf) |
| 1486 | { |
| 1487 | int i; |
| 1488 | kern_return_t kret; |
| 1489 | |
| 1490 | for (i = 0; i < inf->exception_info.count; i++) |
| 1491 | { |
| 1492 | kret = mach_port_deallocate (gdb_task, inf->exception_info.ports[i]); |
| 1493 | MACH_CHECK_ERROR (kret); |
| 1494 | } |
| 1495 | inf->exception_info.count = 0; |
| 1496 | } |
| 1497 | |
| 1498 | static void |
| 1499 | darwin_setup_exceptions (struct inferior *inf) |
| 1500 | { |
| 1501 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1502 | kern_return_t kret; |
| 1503 | exception_mask_t mask; |
| 1504 | |
| 1505 | kret = darwin_save_exception_ports (priv); |
| 1506 | if (kret != KERN_SUCCESS) |
| 1507 | error (_("Unable to save exception ports, task_get_exception_ports" |
| 1508 | "returned: %d"), |
| 1509 | kret); |
| 1510 | |
| 1511 | /* Set exception port. */ |
| 1512 | if (enable_mach_exceptions) |
| 1513 | mask = EXC_MASK_ALL; |
| 1514 | else |
| 1515 | mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT; |
| 1516 | kret = task_set_exception_ports (priv->task, mask, darwin_ex_port, |
| 1517 | EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| 1518 | if (kret != KERN_SUCCESS) |
| 1519 | error (_("Unable to set exception ports, task_set_exception_ports" |
| 1520 | "returned: %d"), |
| 1521 | kret); |
| 1522 | } |
| 1523 | |
| 1524 | void |
| 1525 | darwin_nat_target::kill () |
| 1526 | { |
| 1527 | struct inferior *inf = current_inferior (); |
| 1528 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1529 | struct target_waitstatus wstatus; |
| 1530 | ptid_t ptid; |
| 1531 | kern_return_t kret; |
| 1532 | int res; |
| 1533 | |
| 1534 | if (inferior_ptid == null_ptid) |
| 1535 | return; |
| 1536 | |
| 1537 | gdb_assert (inf != NULL); |
| 1538 | |
| 1539 | kret = darwin_restore_exception_ports (priv); |
| 1540 | MACH_CHECK_ERROR (kret); |
| 1541 | |
| 1542 | darwin_reply_to_all_pending_messages (inf); |
| 1543 | |
| 1544 | res = ::kill (inf->pid, 9); |
| 1545 | |
| 1546 | if (res == 0) |
| 1547 | { |
| 1548 | /* On MacOS version Sierra, the darwin_restore_exception_ports call |
| 1549 | does not work as expected. |
| 1550 | When the kill function is called, the SIGKILL signal is received |
| 1551 | by gdb whereas it should have been received by the kernel since |
| 1552 | the exception ports have been restored. |
| 1553 | This behavior is not the expected one thus gdb does not reply to |
| 1554 | the received SIGKILL message. This situation leads to a "busy" |
| 1555 | resource from the kernel point of view and the inferior is never |
| 1556 | released, causing it to remain as a zombie process, even after |
| 1557 | GDB exits. |
| 1558 | To work around this, we mark all the threads of the inferior as |
| 1559 | signaled thus darwin_decode_message function knows that the kill |
| 1560 | signal was sent by gdb and will take the appropriate action |
| 1561 | (cancel signal and reply to the signal message). */ |
| 1562 | for (darwin_thread_t *thread : priv->threads) |
| 1563 | thread->signaled = 1; |
| 1564 | |
| 1565 | darwin_resume_inferior (inf); |
| 1566 | |
| 1567 | ptid = darwin_wait (inferior_ptid, &wstatus); |
| 1568 | } |
| 1569 | else if (errno != ESRCH) |
| 1570 | warning (_("Failed to kill inferior: kill (%d, 9) returned [%s]"), |
| 1571 | inf->pid, safe_strerror (errno)); |
| 1572 | |
| 1573 | target_mourn_inferior (inferior_ptid); |
| 1574 | } |
| 1575 | |
| 1576 | static void |
| 1577 | darwin_setup_request_notification (struct inferior *inf) |
| 1578 | { |
| 1579 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1580 | kern_return_t kret; |
| 1581 | mach_port_t prev_not; |
| 1582 | |
| 1583 | kret = mach_port_request_notification (gdb_task, priv->task, |
| 1584 | MACH_NOTIFY_DEAD_NAME, 0, |
| 1585 | priv->notify_port, |
| 1586 | MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| 1587 | &prev_not); |
| 1588 | if (kret != KERN_SUCCESS) |
| 1589 | error (_("Termination notification request failed, " |
| 1590 | "mach_port_request_notification\n" |
| 1591 | "returned: %d"), |
| 1592 | kret); |
| 1593 | if (prev_not != MACH_PORT_NULL) |
| 1594 | { |
| 1595 | /* This is unexpected, as there should not be any previously |
| 1596 | registered notification request. But this is not a fatal |
| 1597 | issue, so just emit a warning. */ |
| 1598 | warning (_("\ |
| 1599 | A task termination request was registered before the debugger registered\n\ |
| 1600 | its own. This is unexpected, but should otherwise not have any actual\n\ |
| 1601 | impact on the debugging session.")); |
| 1602 | } |
| 1603 | } |
| 1604 | |
| 1605 | static void |
| 1606 | darwin_attach_pid (struct inferior *inf) |
| 1607 | { |
| 1608 | kern_return_t kret; |
| 1609 | |
| 1610 | darwin_inferior *priv = new darwin_inferior; |
| 1611 | inf->priv.reset (priv); |
| 1612 | |
| 1613 | try |
| 1614 | { |
| 1615 | kret = task_for_pid (gdb_task, inf->pid, &priv->task); |
| 1616 | if (kret != KERN_SUCCESS) |
| 1617 | { |
| 1618 | int status; |
| 1619 | |
| 1620 | if (!inf->attach_flag) |
| 1621 | { |
| 1622 | kill (inf->pid, 9); |
| 1623 | waitpid (inf->pid, &status, 0); |
| 1624 | } |
| 1625 | |
| 1626 | error |
| 1627 | (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n" |
| 1628 | " (please check gdb is codesigned - see taskgated(8))"), |
| 1629 | inf->pid, mach_error_string (kret), (unsigned long) kret); |
| 1630 | } |
| 1631 | |
| 1632 | inferior_debug (2, _("inferior task: 0x%x, pid: %d\n"), |
| 1633 | priv->task, inf->pid); |
| 1634 | |
| 1635 | if (darwin_ex_port == MACH_PORT_NULL) |
| 1636 | { |
| 1637 | /* Create a port to get exceptions. */ |
| 1638 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| 1639 | &darwin_ex_port); |
| 1640 | if (kret != KERN_SUCCESS) |
| 1641 | error (_("Unable to create exception port, mach_port_allocate " |
| 1642 | "returned: %d"), |
| 1643 | kret); |
| 1644 | |
| 1645 | kret = mach_port_insert_right (gdb_task, darwin_ex_port, |
| 1646 | darwin_ex_port, |
| 1647 | MACH_MSG_TYPE_MAKE_SEND); |
| 1648 | if (kret != KERN_SUCCESS) |
| 1649 | error (_("Unable to create exception port, mach_port_insert_right " |
| 1650 | "returned: %d"), |
| 1651 | kret); |
| 1652 | |
| 1653 | /* Create a port set and put ex_port in it. */ |
| 1654 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET, |
| 1655 | &darwin_port_set); |
| 1656 | if (kret != KERN_SUCCESS) |
| 1657 | error (_("Unable to create port set, mach_port_allocate " |
| 1658 | "returned: %d"), |
| 1659 | kret); |
| 1660 | |
| 1661 | kret = mach_port_move_member (gdb_task, darwin_ex_port, |
| 1662 | darwin_port_set); |
| 1663 | if (kret != KERN_SUCCESS) |
| 1664 | error (_("Unable to move exception port into new port set, " |
| 1665 | "mach_port_move_member\n" |
| 1666 | "returned: %d"), |
| 1667 | kret); |
| 1668 | } |
| 1669 | |
| 1670 | /* Create a port to be notified when the child task terminates. */ |
| 1671 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| 1672 | &priv->notify_port); |
| 1673 | if (kret != KERN_SUCCESS) |
| 1674 | error (_("Unable to create notification port, mach_port_allocate " |
| 1675 | "returned: %d"), |
| 1676 | kret); |
| 1677 | |
| 1678 | kret = mach_port_move_member (gdb_task, |
| 1679 | priv->notify_port, darwin_port_set); |
| 1680 | if (kret != KERN_SUCCESS) |
| 1681 | error (_("Unable to move notification port into new port set, " |
| 1682 | "mach_port_move_member\n" |
| 1683 | "returned: %d"), |
| 1684 | kret); |
| 1685 | |
| 1686 | darwin_setup_request_notification (inf); |
| 1687 | |
| 1688 | darwin_setup_exceptions (inf); |
| 1689 | } |
| 1690 | catch (const gdb_exception &ex) |
| 1691 | { |
| 1692 | exit_inferior (inf); |
| 1693 | inferior_ptid = null_ptid; |
| 1694 | |
| 1695 | throw; |
| 1696 | } |
| 1697 | |
| 1698 | target_ops *darwin_ops = get_native_target (); |
| 1699 | if (!target_is_pushed (darwin_ops)) |
| 1700 | push_target (darwin_ops); |
| 1701 | } |
| 1702 | |
| 1703 | /* Get the thread_info object corresponding to this darwin_thread_info. */ |
| 1704 | |
| 1705 | static struct thread_info * |
| 1706 | thread_info_from_private_thread_info (darwin_thread_info *pti) |
| 1707 | { |
| 1708 | for (struct thread_info *it : all_threads ()) |
| 1709 | { |
| 1710 | darwin_thread_info *iter_pti = get_darwin_thread_info (it); |
| 1711 | |
| 1712 | if (iter_pti->gdb_port == pti->gdb_port) |
| 1713 | return it; |
| 1714 | } |
| 1715 | |
| 1716 | gdb_assert_not_reached ("did not find gdb thread for darwin thread"); |
| 1717 | } |
| 1718 | |
| 1719 | static void |
| 1720 | darwin_init_thread_list (struct inferior *inf) |
| 1721 | { |
| 1722 | darwin_check_new_threads (inf); |
| 1723 | |
| 1724 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 1725 | |
| 1726 | gdb_assert (!priv->threads.empty ()); |
| 1727 | |
| 1728 | darwin_thread_info *first_pti = priv->threads.front (); |
| 1729 | struct thread_info *first_thread |
| 1730 | = thread_info_from_private_thread_info (first_pti); |
| 1731 | |
| 1732 | inferior_ptid = first_thread->ptid; |
| 1733 | } |
| 1734 | |
| 1735 | /* The child must synchronize with gdb: gdb must set the exception port |
| 1736 | before the child call PTRACE_SIGEXC. We use a pipe to achieve this. |
| 1737 | FIXME: is there a lighter way ? */ |
| 1738 | static int ptrace_fds[2]; |
| 1739 | |
| 1740 | static void |
| 1741 | darwin_ptrace_me (void) |
| 1742 | { |
| 1743 | int res; |
| 1744 | char c; |
| 1745 | |
| 1746 | /* Close write end point. */ |
| 1747 | if (close (ptrace_fds[1]) < 0) |
| 1748 | trace_start_error_with_name ("close"); |
| 1749 | |
| 1750 | /* Wait until gdb is ready. */ |
| 1751 | res = read (ptrace_fds[0], &c, 1); |
| 1752 | if (res != 0) |
| 1753 | trace_start_error (_("unable to read from pipe, read returned: %d"), res); |
| 1754 | |
| 1755 | if (close (ptrace_fds[0]) < 0) |
| 1756 | trace_start_error_with_name ("close"); |
| 1757 | |
| 1758 | /* Get rid of privileges. */ |
| 1759 | if (setegid (getgid ()) < 0) |
| 1760 | trace_start_error_with_name ("setegid"); |
| 1761 | |
| 1762 | /* Set TRACEME. */ |
| 1763 | if (PTRACE (PT_TRACE_ME, 0, 0, 0) < 0) |
| 1764 | trace_start_error_with_name ("PTRACE"); |
| 1765 | |
| 1766 | /* Redirect signals to exception port. */ |
| 1767 | if (PTRACE (PT_SIGEXC, 0, 0, 0) < 0) |
| 1768 | trace_start_error_with_name ("PTRACE"); |
| 1769 | } |
| 1770 | |
| 1771 | /* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). */ |
| 1772 | static void |
| 1773 | darwin_pre_ptrace (void) |
| 1774 | { |
| 1775 | if (pipe (ptrace_fds) != 0) |
| 1776 | { |
| 1777 | ptrace_fds[0] = -1; |
| 1778 | ptrace_fds[1] = -1; |
| 1779 | error (_("unable to create a pipe: %s"), safe_strerror (errno)); |
| 1780 | } |
| 1781 | |
| 1782 | mark_fd_no_cloexec (ptrace_fds[0]); |
| 1783 | mark_fd_no_cloexec (ptrace_fds[1]); |
| 1784 | } |
| 1785 | |
| 1786 | static void |
| 1787 | darwin_ptrace_him (int pid) |
| 1788 | { |
| 1789 | struct inferior *inf = current_inferior (); |
| 1790 | |
| 1791 | darwin_attach_pid (inf); |
| 1792 | |
| 1793 | /* Let's the child run. */ |
| 1794 | close (ptrace_fds[0]); |
| 1795 | close (ptrace_fds[1]); |
| 1796 | |
| 1797 | unmark_fd_no_cloexec (ptrace_fds[0]); |
| 1798 | unmark_fd_no_cloexec (ptrace_fds[1]); |
| 1799 | |
| 1800 | darwin_init_thread_list (inf); |
| 1801 | |
| 1802 | gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED); |
| 1803 | } |
| 1804 | |
| 1805 | static void |
| 1806 | darwin_execvp (const char *file, char * const argv[], char * const env[]) |
| 1807 | { |
| 1808 | posix_spawnattr_t attr; |
| 1809 | short ps_flags = 0; |
| 1810 | int res; |
| 1811 | |
| 1812 | res = posix_spawnattr_init (&attr); |
| 1813 | if (res != 0) |
| 1814 | { |
| 1815 | fprintf_unfiltered |
| 1816 | (gdb_stderr, "Cannot initialize attribute for posix_spawn\n"); |
| 1817 | return; |
| 1818 | } |
| 1819 | |
| 1820 | /* Do like execve: replace the image. */ |
| 1821 | ps_flags = POSIX_SPAWN_SETEXEC; |
| 1822 | |
| 1823 | /* Disable ASLR. The constant doesn't look to be available outside the |
| 1824 | kernel include files. */ |
| 1825 | #ifndef _POSIX_SPAWN_DISABLE_ASLR |
| 1826 | #define _POSIX_SPAWN_DISABLE_ASLR 0x0100 |
| 1827 | #endif |
| 1828 | ps_flags |= _POSIX_SPAWN_DISABLE_ASLR; |
| 1829 | res = posix_spawnattr_setflags (&attr, ps_flags); |
| 1830 | if (res != 0) |
| 1831 | { |
| 1832 | fprintf_unfiltered (gdb_stderr, "Cannot set posix_spawn flags\n"); |
| 1833 | return; |
| 1834 | } |
| 1835 | |
| 1836 | posix_spawnp (NULL, argv[0], NULL, &attr, argv, env); |
| 1837 | } |
| 1838 | |
| 1839 | /* Read kernel version, and return TRUE if this host may have System |
| 1840 | Integrity Protection (Sierra or later). */ |
| 1841 | |
| 1842 | static bool |
| 1843 | may_have_sip () |
| 1844 | { |
| 1845 | char str[16]; |
| 1846 | size_t sz = sizeof (str); |
| 1847 | int ret; |
| 1848 | |
| 1849 | ret = sysctlbyname ("kern.osrelease", str, &sz, NULL, 0); |
| 1850 | if (ret == 0 && sz < sizeof (str)) |
| 1851 | { |
| 1852 | unsigned long ver = strtoul (str, NULL, 10); |
| 1853 | if (ver >= 16) |
| 1854 | return true; |
| 1855 | } |
| 1856 | return false; |
| 1857 | } |
| 1858 | |
| 1859 | /* A helper for maybe_cache_shell. This copies the shell to the |
| 1860 | cache. It will throw an exception on any failure. */ |
| 1861 | |
| 1862 | static void |
| 1863 | copy_shell_to_cache (const char *shell, const std::string &new_name) |
| 1864 | { |
| 1865 | scoped_fd from_fd (gdb_open_cloexec (shell, O_RDONLY, 0)); |
| 1866 | if (from_fd.get () < 0) |
| 1867 | error (_("Could not open shell (%s) for reading: %s"), |
| 1868 | shell, safe_strerror (errno)); |
| 1869 | |
| 1870 | std::string new_dir = ldirname (new_name.c_str ()); |
| 1871 | if (!mkdir_recursive (new_dir.c_str ())) |
| 1872 | error (_("Could not make cache directory \"%s\": %s"), |
| 1873 | new_dir.c_str (), safe_strerror (errno)); |
| 1874 | |
| 1875 | gdb::char_vector temp_name = make_temp_filename (new_name); |
| 1876 | scoped_fd to_fd (gdb_mkostemp_cloexec (&temp_name[0])); |
| 1877 | gdb::unlinker unlink_file_on_error (temp_name.data ()); |
| 1878 | |
| 1879 | if (to_fd.get () < 0) |
| 1880 | error (_("Could not open temporary file \"%s\" for writing: %s"), |
| 1881 | temp_name.data (), safe_strerror (errno)); |
| 1882 | |
| 1883 | if (fcopyfile (from_fd.get (), to_fd.get (), nullptr, |
| 1884 | COPYFILE_STAT | COPYFILE_DATA) != 0) |
| 1885 | error (_("Could not copy shell to cache as \"%s\": %s"), |
| 1886 | temp_name.data (), safe_strerror (errno)); |
| 1887 | |
| 1888 | /* Be sure that the caching is atomic so that we don't get bad |
| 1889 | results from multiple copies of gdb running at the same time. */ |
| 1890 | if (rename (temp_name.data (), new_name.c_str ()) != 0) |
| 1891 | error (_("Could not rename shell cache file to \"%s\": %s"), |
| 1892 | new_name.c_str (), safe_strerror (errno)); |
| 1893 | |
| 1894 | unlink_file_on_error.keep (); |
| 1895 | } |
| 1896 | |
| 1897 | /* If $SHELL is restricted, try to cache a copy. Starting with El |
| 1898 | Capitan, macOS introduced System Integrity Protection. Among other |
| 1899 | things, this prevents certain executables from being ptrace'd. In |
| 1900 | particular, executables in /bin, like most shells, are affected. |
| 1901 | To work around this, while preserving command-line glob expansion |
| 1902 | and redirections, gdb will cache a copy of the shell. Return true |
| 1903 | if all is well -- either the shell is not subject to SIP or it has |
| 1904 | been successfully cached. Returns false if something failed. */ |
| 1905 | |
| 1906 | static bool |
| 1907 | maybe_cache_shell () |
| 1908 | { |
| 1909 | /* SF_RESTRICTED is defined in sys/stat.h and lets us determine if a |
| 1910 | given file is subject to SIP. */ |
| 1911 | #ifdef SF_RESTRICTED |
| 1912 | |
| 1913 | /* If a check fails we want to revert -- maybe the user deleted the |
| 1914 | cache while gdb was running, or something like that. */ |
| 1915 | copied_shell = nullptr; |
| 1916 | |
| 1917 | const char *shell = get_shell (); |
| 1918 | if (!IS_ABSOLUTE_PATH (shell)) |
| 1919 | { |
| 1920 | warning (_("This version of macOS has System Integrity Protection.\n\ |
| 1921 | Normally gdb would try to work around this by caching a copy of your shell,\n\ |
| 1922 | but because your shell (%s) is not an absolute path, this is being skipped."), |
| 1923 | shell); |
| 1924 | return false; |
| 1925 | } |
| 1926 | |
| 1927 | struct stat sb; |
| 1928 | if (stat (shell, &sb) < 0) |
| 1929 | { |
| 1930 | warning (_("This version of macOS has System Integrity Protection.\n\ |
| 1931 | Normally gdb would try to work around this by caching a copy of your shell,\n\ |
| 1932 | but because gdb could not stat your shell (%s), this is being skipped.\n\ |
| 1933 | The error was: %s"), |
| 1934 | shell, safe_strerror (errno)); |
| 1935 | return false; |
| 1936 | } |
| 1937 | |
| 1938 | if ((sb.st_flags & SF_RESTRICTED) == 0) |
| 1939 | return true; |
| 1940 | |
| 1941 | /* Put the copy somewhere like ~/Library/Caches/gdb/bin/sh. */ |
| 1942 | std::string new_name = get_standard_cache_dir (); |
| 1943 | /* There's no need to insert a directory separator here, because |
| 1944 | SHELL is known to be absolute. */ |
| 1945 | new_name.append (shell); |
| 1946 | |
| 1947 | /* Maybe it was cached by some earlier gdb. */ |
| 1948 | if (stat (new_name.c_str (), &sb) != 0 || !S_ISREG (sb.st_mode)) |
| 1949 | { |
| 1950 | try |
| 1951 | { |
| 1952 | copy_shell_to_cache (shell, new_name); |
| 1953 | } |
| 1954 | catch (const gdb_exception_error &ex) |
| 1955 | { |
| 1956 | warning (_("This version of macOS has System Integrity Protection.\n\ |
| 1957 | Because `startup-with-shell' is enabled, gdb tried to work around SIP by\n\ |
| 1958 | caching a copy of your shell. However, this failed:\n\ |
| 1959 | %s\n\ |
| 1960 | If you correct the problem, gdb will automatically try again the next time\n\ |
| 1961 | you \"run\". To prevent these attempts, you can use:\n\ |
| 1962 | set startup-with-shell off"), |
| 1963 | ex.what ()); |
| 1964 | return false; |
| 1965 | } |
| 1966 | |
| 1967 | printf_filtered (_("Note: this version of macOS has System Integrity Protection.\n\ |
| 1968 | Because `startup-with-shell' is enabled, gdb has worked around this by\n\ |
| 1969 | caching a copy of your shell. The shell used by \"run\" is now:\n\ |
| 1970 | %s\n"), |
| 1971 | new_name.c_str ()); |
| 1972 | } |
| 1973 | |
| 1974 | /* We need to make sure that the new name has the correct lifetime. */ |
| 1975 | static std::string saved_shell = std::move (new_name); |
| 1976 | copied_shell = saved_shell.c_str (); |
| 1977 | |
| 1978 | #endif /* SF_RESTRICTED */ |
| 1979 | |
| 1980 | return true; |
| 1981 | } |
| 1982 | |
| 1983 | void |
| 1984 | darwin_nat_target::create_inferior (const char *exec_file, |
| 1985 | const std::string &allargs, |
| 1986 | char **env, int from_tty) |
| 1987 | { |
| 1988 | gdb::optional<scoped_restore_tmpl<bool>> restore_startup_with_shell; |
| 1989 | |
| 1990 | if (startup_with_shell && may_have_sip ()) |
| 1991 | { |
| 1992 | if (!maybe_cache_shell ()) |
| 1993 | { |
| 1994 | warning (_("startup-with-shell is now temporarily disabled")); |
| 1995 | restore_startup_with_shell.emplace (&startup_with_shell, 0); |
| 1996 | } |
| 1997 | } |
| 1998 | |
| 1999 | /* Do the hard work. */ |
| 2000 | fork_inferior (exec_file, allargs, env, darwin_ptrace_me, |
| 2001 | darwin_ptrace_him, darwin_pre_ptrace, copied_shell, |
| 2002 | darwin_execvp); |
| 2003 | } |
| 2004 | \f |
| 2005 | |
| 2006 | /* Set things up such that the next call to darwin_wait will immediately |
| 2007 | return a fake stop event for inferior INF. |
| 2008 | |
| 2009 | This assumes that the inferior's thread list has been initialized, |
| 2010 | as it will suspend the inferior's first thread. */ |
| 2011 | |
| 2012 | static void |
| 2013 | darwin_setup_fake_stop_event (struct inferior *inf) |
| 2014 | { |
| 2015 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2016 | darwin_thread_t *thread; |
| 2017 | kern_return_t kret; |
| 2018 | |
| 2019 | gdb_assert (darwin_inf_fake_stop == NULL); |
| 2020 | darwin_inf_fake_stop = inf; |
| 2021 | |
| 2022 | /* When detecting a fake pending stop event, darwin_wait returns |
| 2023 | an event saying that the first thread is in a DARWIN_STOPPED |
| 2024 | state. To make that accurate, we need to suspend that thread |
| 2025 | as well. Otherwise, we'll try resuming it when resuming the |
| 2026 | inferior, and get a warning because the thread's suspend count |
| 2027 | is already zero, making the resume request useless. */ |
| 2028 | thread = priv->threads[0]; |
| 2029 | kret = thread_suspend (thread->gdb_port); |
| 2030 | MACH_CHECK_ERROR (kret); |
| 2031 | } |
| 2032 | |
| 2033 | /* Attach to process PID, then initialize for debugging it |
| 2034 | and wait for the trace-trap that results from attaching. */ |
| 2035 | void |
| 2036 | darwin_nat_target::attach (const char *args, int from_tty) |
| 2037 | { |
| 2038 | pid_t pid; |
| 2039 | struct inferior *inf; |
| 2040 | |
| 2041 | pid = parse_pid_to_attach (args); |
| 2042 | |
| 2043 | if (pid == getpid ()) /* Trying to masturbate? */ |
| 2044 | error (_("I refuse to debug myself!")); |
| 2045 | |
| 2046 | if (from_tty) |
| 2047 | { |
| 2048 | const char *exec_file = get_exec_file (0); |
| 2049 | |
| 2050 | if (exec_file) |
| 2051 | printf_unfiltered (_("Attaching to program: %s, %s\n"), exec_file, |
| 2052 | target_pid_to_str (ptid_t (pid)).c_str ()); |
| 2053 | else |
| 2054 | printf_unfiltered (_("Attaching to %s\n"), |
| 2055 | target_pid_to_str (ptid_t (pid)).c_str ()); |
| 2056 | } |
| 2057 | |
| 2058 | if (pid == 0 || ::kill (pid, 0) < 0) |
| 2059 | error (_("Can't attach to process %d: %s (%d)"), |
| 2060 | pid, safe_strerror (errno), errno); |
| 2061 | |
| 2062 | inferior_ptid = ptid_t (pid); |
| 2063 | inf = current_inferior (); |
| 2064 | inferior_appeared (inf, pid); |
| 2065 | inf->attach_flag = 1; |
| 2066 | |
| 2067 | darwin_attach_pid (inf); |
| 2068 | |
| 2069 | darwin_suspend_inferior (inf); |
| 2070 | |
| 2071 | darwin_init_thread_list (inf); |
| 2072 | |
| 2073 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2074 | |
| 2075 | darwin_check_osabi (priv, inferior_ptid.tid ()); |
| 2076 | |
| 2077 | darwin_setup_fake_stop_event (inf); |
| 2078 | |
| 2079 | priv->no_ptrace = 1; |
| 2080 | } |
| 2081 | |
| 2082 | /* Take a program previously attached to and detaches it. |
| 2083 | The program resumes execution and will no longer stop |
| 2084 | on signals, etc. We'd better not have left any breakpoints |
| 2085 | in the program or it'll die when it hits one. For this |
| 2086 | to work, it may be necessary for the process to have been |
| 2087 | previously attached. It *might* work if the program was |
| 2088 | started via fork. */ |
| 2089 | |
| 2090 | void |
| 2091 | darwin_nat_target::detach (inferior *inf, int from_tty) |
| 2092 | { |
| 2093 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2094 | kern_return_t kret; |
| 2095 | int res; |
| 2096 | |
| 2097 | /* Display message. */ |
| 2098 | target_announce_detach (from_tty); |
| 2099 | |
| 2100 | /* If ptrace() is in use, stop the process. */ |
| 2101 | if (!priv->no_ptrace) |
| 2102 | darwin_stop_inferior (inf); |
| 2103 | |
| 2104 | kret = darwin_restore_exception_ports (priv); |
| 2105 | MACH_CHECK_ERROR (kret); |
| 2106 | |
| 2107 | if (!priv->no_ptrace) |
| 2108 | { |
| 2109 | res = PTRACE (PT_DETACH, inf->pid, 0, 0); |
| 2110 | if (res != 0) |
| 2111 | printf_unfiltered (_("Unable to detach from process-id %d: %s (%d)"), |
| 2112 | inf->pid, safe_strerror (errno), errno); |
| 2113 | } |
| 2114 | |
| 2115 | darwin_reply_to_all_pending_messages (inf); |
| 2116 | |
| 2117 | /* When using ptrace, we have just performed a PT_DETACH, which |
| 2118 | resumes the inferior. On the other hand, when we are not using |
| 2119 | ptrace, we need to resume its execution ourselves. */ |
| 2120 | if (priv->no_ptrace) |
| 2121 | darwin_resume_inferior (inf); |
| 2122 | |
| 2123 | mourn_inferior (); |
| 2124 | } |
| 2125 | |
| 2126 | std::string |
| 2127 | darwin_nat_target::pid_to_str (ptid_t ptid) |
| 2128 | { |
| 2129 | long tid = ptid.tid (); |
| 2130 | |
| 2131 | if (tid != 0) |
| 2132 | return string_printf (_("Thread 0x%lx of process %u"), |
| 2133 | tid, ptid.pid ()); |
| 2134 | |
| 2135 | return normal_pid_to_str (ptid); |
| 2136 | } |
| 2137 | |
| 2138 | bool |
| 2139 | darwin_nat_target::thread_alive (ptid_t ptid) |
| 2140 | { |
| 2141 | return true; |
| 2142 | } |
| 2143 | |
| 2144 | /* If RDADDR is not NULL, read inferior task's LEN bytes from ADDR and |
| 2145 | copy it to RDADDR in gdb's address space. |
| 2146 | If WRADDR is not NULL, write gdb's LEN bytes from WRADDR and copy it |
| 2147 | to ADDR in inferior task's address space. |
| 2148 | Return 0 on failure; number of bytes read / written otherwise. */ |
| 2149 | |
| 2150 | static int |
| 2151 | darwin_read_write_inferior (task_t task, CORE_ADDR addr, |
| 2152 | gdb_byte *rdaddr, const gdb_byte *wraddr, |
| 2153 | ULONGEST length) |
| 2154 | { |
| 2155 | kern_return_t kret; |
| 2156 | mach_vm_size_t res_length = 0; |
| 2157 | |
| 2158 | inferior_debug (8, _("darwin_read_write_inferior(task=0x%x, %s, len=%s)\n"), |
| 2159 | task, core_addr_to_string (addr), pulongest (length)); |
| 2160 | |
| 2161 | /* First read. */ |
| 2162 | if (rdaddr != NULL) |
| 2163 | { |
| 2164 | mach_vm_size_t count; |
| 2165 | |
| 2166 | /* According to target.h(to_xfer_partial), one and only one may be |
| 2167 | non-null. */ |
| 2168 | gdb_assert (wraddr == NULL); |
| 2169 | |
| 2170 | kret = mach_vm_read_overwrite (task, addr, length, |
| 2171 | (mach_vm_address_t) rdaddr, &count); |
| 2172 | if (kret != KERN_SUCCESS) |
| 2173 | { |
| 2174 | inferior_debug |
| 2175 | (1, _("darwin_read_write_inferior: mach_vm_read failed at %s: %s"), |
| 2176 | core_addr_to_string (addr), mach_error_string (kret)); |
| 2177 | return 0; |
| 2178 | } |
| 2179 | return count; |
| 2180 | } |
| 2181 | |
| 2182 | /* See above. */ |
| 2183 | gdb_assert (wraddr != NULL); |
| 2184 | |
| 2185 | while (length != 0) |
| 2186 | { |
| 2187 | mach_vm_address_t offset = addr & (mach_page_size - 1); |
| 2188 | mach_vm_address_t region_address = (mach_vm_address_t) (addr - offset); |
| 2189 | mach_vm_size_t aligned_length = |
| 2190 | (mach_vm_size_t) PAGE_ROUND (offset + length); |
| 2191 | vm_region_submap_short_info_data_64_t info; |
| 2192 | mach_msg_type_number_t count = VM_REGION_SUBMAP_SHORT_INFO_COUNT_64; |
| 2193 | natural_t region_depth = 1000; |
| 2194 | mach_vm_address_t region_start = region_address; |
| 2195 | mach_vm_size_t region_length; |
| 2196 | mach_vm_size_t write_length; |
| 2197 | |
| 2198 | /* Read page protection. */ |
| 2199 | kret = mach_vm_region_recurse |
| 2200 | (task, ®ion_start, ®ion_length, ®ion_depth, |
| 2201 | (vm_region_recurse_info_t) &info, &count); |
| 2202 | |
| 2203 | if (kret != KERN_SUCCESS) |
| 2204 | { |
| 2205 | inferior_debug (1, _("darwin_read_write_inferior: " |
| 2206 | "mach_vm_region_recurse failed at %s: %s\n"), |
| 2207 | core_addr_to_string (region_address), |
| 2208 | mach_error_string (kret)); |
| 2209 | return res_length; |
| 2210 | } |
| 2211 | |
| 2212 | inferior_debug |
| 2213 | (9, _("darwin_read_write_inferior: " |
| 2214 | "mach_vm_region_recurse addr=%s, start=%s, len=%s\n"), |
| 2215 | core_addr_to_string (region_address), |
| 2216 | core_addr_to_string (region_start), |
| 2217 | core_addr_to_string (region_length)); |
| 2218 | |
| 2219 | /* Check for holes in memory. */ |
| 2220 | if (region_start > region_address) |
| 2221 | { |
| 2222 | warning (_("No memory at %s (vs %s+0x%x). Nothing written"), |
| 2223 | core_addr_to_string (region_address), |
| 2224 | core_addr_to_string (region_start), |
| 2225 | (unsigned)region_length); |
| 2226 | return res_length; |
| 2227 | } |
| 2228 | |
| 2229 | /* Adjust the length. */ |
| 2230 | region_length -= (region_address - region_start); |
| 2231 | if (region_length > aligned_length) |
| 2232 | region_length = aligned_length; |
| 2233 | |
| 2234 | /* Make the pages RW. */ |
| 2235 | if (!(info.protection & VM_PROT_WRITE)) |
| 2236 | { |
| 2237 | vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE; |
| 2238 | |
| 2239 | kret = mach_vm_protect (task, region_address, region_length, |
| 2240 | FALSE, prot); |
| 2241 | if (kret != KERN_SUCCESS) |
| 2242 | { |
| 2243 | prot |= VM_PROT_COPY; |
| 2244 | kret = mach_vm_protect (task, region_address, region_length, |
| 2245 | FALSE, prot); |
| 2246 | } |
| 2247 | if (kret != KERN_SUCCESS) |
| 2248 | { |
| 2249 | warning (_("darwin_read_write_inferior: " |
| 2250 | "mach_vm_protect failed at %s " |
| 2251 | "(len=0x%lx, prot=0x%x): %s"), |
| 2252 | core_addr_to_string (region_address), |
| 2253 | (unsigned long) region_length, (unsigned) prot, |
| 2254 | mach_error_string (kret)); |
| 2255 | return res_length; |
| 2256 | } |
| 2257 | } |
| 2258 | |
| 2259 | if (offset + length > region_length) |
| 2260 | write_length = region_length - offset; |
| 2261 | else |
| 2262 | write_length = length; |
| 2263 | |
| 2264 | /* Write. */ |
| 2265 | kret = mach_vm_write (task, addr, (vm_offset_t) wraddr, write_length); |
| 2266 | if (kret != KERN_SUCCESS) |
| 2267 | { |
| 2268 | warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"), |
| 2269 | mach_error_string (kret)); |
| 2270 | return res_length; |
| 2271 | } |
| 2272 | |
| 2273 | /* Restore page rights. */ |
| 2274 | if (!(info.protection & VM_PROT_WRITE)) |
| 2275 | { |
| 2276 | kret = mach_vm_protect (task, region_address, region_length, |
| 2277 | FALSE, info.protection); |
| 2278 | if (kret != KERN_SUCCESS) |
| 2279 | { |
| 2280 | warning (_("darwin_read_write_inferior: " |
| 2281 | "mach_vm_protect restore failed at %s " |
| 2282 | "(len=0x%lx): %s"), |
| 2283 | core_addr_to_string (region_address), |
| 2284 | (unsigned long) region_length, |
| 2285 | mach_error_string (kret)); |
| 2286 | } |
| 2287 | } |
| 2288 | |
| 2289 | addr += write_length; |
| 2290 | wraddr += write_length; |
| 2291 | res_length += write_length; |
| 2292 | length -= write_length; |
| 2293 | } |
| 2294 | |
| 2295 | return res_length; |
| 2296 | } |
| 2297 | |
| 2298 | /* Read LENGTH bytes at offset ADDR of task_dyld_info for TASK, and copy them |
| 2299 | to RDADDR (in big endian). |
| 2300 | Return 0 on failure; number of bytes read / written otherwise. */ |
| 2301 | |
| 2302 | #ifdef TASK_DYLD_INFO_COUNT |
| 2303 | /* This is not available in Darwin 9. */ |
| 2304 | static enum target_xfer_status |
| 2305 | darwin_read_dyld_info (task_t task, CORE_ADDR addr, gdb_byte *rdaddr, |
| 2306 | ULONGEST length, ULONGEST *xfered_len) |
| 2307 | { |
| 2308 | struct task_dyld_info task_dyld_info; |
| 2309 | mach_msg_type_number_t count = TASK_DYLD_INFO_COUNT; |
| 2310 | kern_return_t kret; |
| 2311 | |
| 2312 | if (addr != 0 || length > sizeof (mach_vm_address_t)) |
| 2313 | return TARGET_XFER_EOF; |
| 2314 | |
| 2315 | kret = task_info (task, TASK_DYLD_INFO, |
| 2316 | (task_info_t) &task_dyld_info, &count); |
| 2317 | MACH_CHECK_ERROR (kret); |
| 2318 | if (kret != KERN_SUCCESS) |
| 2319 | return TARGET_XFER_E_IO; |
| 2320 | |
| 2321 | store_unsigned_integer (rdaddr, length, BFD_ENDIAN_BIG, |
| 2322 | task_dyld_info.all_image_info_addr); |
| 2323 | *xfered_len = (ULONGEST) length; |
| 2324 | return TARGET_XFER_OK; |
| 2325 | } |
| 2326 | #endif |
| 2327 | |
| 2328 | \f |
| 2329 | |
| 2330 | enum target_xfer_status |
| 2331 | darwin_nat_target::xfer_partial (enum target_object object, const char *annex, |
| 2332 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 2333 | ULONGEST offset, ULONGEST len, |
| 2334 | ULONGEST *xfered_len) |
| 2335 | { |
| 2336 | struct inferior *inf = current_inferior (); |
| 2337 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2338 | |
| 2339 | inferior_debug |
| 2340 | (8, _("darwin_xfer_partial(%s, %s, rbuf=%s, wbuf=%s) pid=%u\n"), |
| 2341 | core_addr_to_string (offset), pulongest (len), |
| 2342 | host_address_to_string (readbuf), host_address_to_string (writebuf), |
| 2343 | inf->pid); |
| 2344 | |
| 2345 | switch (object) |
| 2346 | { |
| 2347 | case TARGET_OBJECT_MEMORY: |
| 2348 | { |
| 2349 | int l = darwin_read_write_inferior (priv->task, offset, |
| 2350 | readbuf, writebuf, len); |
| 2351 | |
| 2352 | if (l == 0) |
| 2353 | return TARGET_XFER_EOF; |
| 2354 | else |
| 2355 | { |
| 2356 | gdb_assert (l > 0); |
| 2357 | *xfered_len = (ULONGEST) l; |
| 2358 | return TARGET_XFER_OK; |
| 2359 | } |
| 2360 | } |
| 2361 | #ifdef TASK_DYLD_INFO_COUNT |
| 2362 | case TARGET_OBJECT_DARWIN_DYLD_INFO: |
| 2363 | if (writebuf != NULL || readbuf == NULL) |
| 2364 | { |
| 2365 | /* Support only read. */ |
| 2366 | return TARGET_XFER_E_IO; |
| 2367 | } |
| 2368 | return darwin_read_dyld_info (priv->task, offset, readbuf, len, |
| 2369 | xfered_len); |
| 2370 | #endif |
| 2371 | default: |
| 2372 | return TARGET_XFER_E_IO; |
| 2373 | } |
| 2374 | |
| 2375 | } |
| 2376 | |
| 2377 | static void |
| 2378 | set_enable_mach_exceptions (const char *args, int from_tty, |
| 2379 | struct cmd_list_element *c) |
| 2380 | { |
| 2381 | if (inferior_ptid != null_ptid) |
| 2382 | { |
| 2383 | struct inferior *inf = current_inferior (); |
| 2384 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2385 | exception_mask_t mask; |
| 2386 | kern_return_t kret; |
| 2387 | |
| 2388 | if (enable_mach_exceptions) |
| 2389 | mask = EXC_MASK_ALL; |
| 2390 | else |
| 2391 | { |
| 2392 | darwin_restore_exception_ports (priv); |
| 2393 | mask = EXC_MASK_SOFTWARE | EXC_MASK_BREAKPOINT; |
| 2394 | } |
| 2395 | kret = task_set_exception_ports (priv->task, mask, darwin_ex_port, |
| 2396 | EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| 2397 | MACH_CHECK_ERROR (kret); |
| 2398 | } |
| 2399 | } |
| 2400 | |
| 2401 | char * |
| 2402 | darwin_nat_target::pid_to_exec_file (int pid) |
| 2403 | { |
| 2404 | static char path[PATH_MAX]; |
| 2405 | int res; |
| 2406 | |
| 2407 | res = proc_pidinfo (pid, PROC_PIDPATHINFO, 0, path, PATH_MAX); |
| 2408 | if (res >= 0) |
| 2409 | return path; |
| 2410 | else |
| 2411 | return NULL; |
| 2412 | } |
| 2413 | |
| 2414 | ptid_t |
| 2415 | darwin_nat_target::get_ada_task_ptid (long lwp, long thread) |
| 2416 | { |
| 2417 | struct inferior *inf = current_inferior (); |
| 2418 | darwin_inferior *priv = get_darwin_inferior (inf); |
| 2419 | kern_return_t kret; |
| 2420 | mach_port_name_array_t names; |
| 2421 | mach_msg_type_number_t names_count; |
| 2422 | mach_port_type_array_t types; |
| 2423 | mach_msg_type_number_t types_count; |
| 2424 | long res = 0; |
| 2425 | |
| 2426 | /* First linear search. */ |
| 2427 | for (darwin_thread_t *t : priv->threads) |
| 2428 | { |
| 2429 | if (t->inf_port == lwp) |
| 2430 | return ptid_t (inferior_ptid.pid (), 0, t->gdb_port); |
| 2431 | } |
| 2432 | |
| 2433 | /* Maybe the port was never extract. Do it now. */ |
| 2434 | |
| 2435 | /* First get inferior port names. */ |
| 2436 | kret = mach_port_names (priv->task, &names, &names_count, &types, |
| 2437 | &types_count); |
| 2438 | MACH_CHECK_ERROR (kret); |
| 2439 | if (kret != KERN_SUCCESS) |
| 2440 | return null_ptid; |
| 2441 | |
| 2442 | /* For each name, copy the right in the gdb space and then compare with |
| 2443 | our view of the inferior threads. We don't forget to deallocate the |
| 2444 | right. */ |
| 2445 | for (int i = 0; i < names_count; i++) |
| 2446 | { |
| 2447 | mach_port_t local_name; |
| 2448 | mach_msg_type_name_t local_type; |
| 2449 | |
| 2450 | /* We just need to know the corresponding name in gdb name space. |
| 2451 | So extract and deallocate the right. */ |
| 2452 | kret = mach_port_extract_right (priv->task, names[i], |
| 2453 | MACH_MSG_TYPE_COPY_SEND, |
| 2454 | &local_name, &local_type); |
| 2455 | if (kret != KERN_SUCCESS) |
| 2456 | continue; |
| 2457 | mach_port_deallocate (gdb_task, local_name); |
| 2458 | |
| 2459 | for (darwin_thread_t *t : priv->threads) |
| 2460 | { |
| 2461 | if (t->gdb_port == local_name) |
| 2462 | { |
| 2463 | t->inf_port = names[i]; |
| 2464 | if (names[i] == lwp) |
| 2465 | res = t->gdb_port; |
| 2466 | } |
| 2467 | } |
| 2468 | } |
| 2469 | |
| 2470 | vm_deallocate (gdb_task, (vm_address_t) names, |
| 2471 | names_count * sizeof (mach_port_t)); |
| 2472 | |
| 2473 | if (res) |
| 2474 | return ptid_t (inferior_ptid.pid (), 0, res); |
| 2475 | else |
| 2476 | return null_ptid; |
| 2477 | } |
| 2478 | |
| 2479 | bool |
| 2480 | darwin_nat_target::supports_multi_process () |
| 2481 | { |
| 2482 | return true; |
| 2483 | } |
| 2484 | |
| 2485 | void |
| 2486 | _initialize_darwin_nat () |
| 2487 | { |
| 2488 | kern_return_t kret; |
| 2489 | |
| 2490 | gdb_task = mach_task_self (); |
| 2491 | darwin_host_self = mach_host_self (); |
| 2492 | |
| 2493 | /* Read page size. */ |
| 2494 | kret = host_page_size (darwin_host_self, &mach_page_size); |
| 2495 | if (kret != KERN_SUCCESS) |
| 2496 | { |
| 2497 | mach_page_size = 0x1000; |
| 2498 | MACH_CHECK_ERROR (kret); |
| 2499 | } |
| 2500 | |
| 2501 | inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), |
| 2502 | (unsigned long) mach_task_self (), getpid ()); |
| 2503 | |
| 2504 | add_setshow_zuinteger_cmd ("darwin", class_obscure, |
| 2505 | &darwin_debug_flag, _("\ |
| 2506 | Set if printing inferior communication debugging statements."), _("\ |
| 2507 | Show if printing inferior communication debugging statements."), NULL, |
| 2508 | NULL, NULL, |
| 2509 | &setdebuglist, &showdebuglist); |
| 2510 | |
| 2511 | add_setshow_boolean_cmd ("mach-exceptions", class_support, |
| 2512 | &enable_mach_exceptions, _("\ |
| 2513 | Set if mach exceptions are caught."), _("\ |
| 2514 | Show if mach exceptions are caught."), _("\ |
| 2515 | When this mode is on, all low level exceptions are reported before being\n\ |
| 2516 | reported by the kernel."), |
| 2517 | &set_enable_mach_exceptions, NULL, |
| 2518 | &setlist, &showlist); |
| 2519 | } |