| 1 | /* Darwin support for GDB, the GNU debugger. |
| 2 | Copyright (C) 2008, 2009 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 | |
| 22 | #include "defs.h" |
| 23 | #include "top.h" |
| 24 | #include "inferior.h" |
| 25 | #include "target.h" |
| 26 | #include "symfile.h" |
| 27 | #include "symtab.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "gdb.h" |
| 30 | #include "gdbcmd.h" |
| 31 | #include "gdbcore.h" |
| 32 | #include "gdbthread.h" |
| 33 | #include "regcache.h" |
| 34 | #include "event-top.h" |
| 35 | #include "inf-loop.h" |
| 36 | #include "gdb_stat.h" |
| 37 | #include "exceptions.h" |
| 38 | #include "inf-child.h" |
| 39 | #include "value.h" |
| 40 | #include "arch-utils.h" |
| 41 | #include "bfd.h" |
| 42 | |
| 43 | #include <sys/ptrace.h> |
| 44 | #include <sys/signal.h> |
| 45 | #include <machine/setjmp.h> |
| 46 | #include <sys/types.h> |
| 47 | #include <unistd.h> |
| 48 | #include <signal.h> |
| 49 | #include <string.h> |
| 50 | #include <ctype.h> |
| 51 | #include <sys/param.h> |
| 52 | #include <sys/sysctl.h> |
| 53 | #include <sys/proc.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 | |
| 66 | /* Quick overview. |
| 67 | Darwin kernel is Mach + BSD derived kernel. Note that they share the |
| 68 | same memory space and are linked together (ie there is no micro-kernel). |
| 69 | |
| 70 | Although ptrace(2) is available on Darwin, it is not complete. We have |
| 71 | to use Mach calls to read and write memory and to modify registers. We |
| 72 | also use Mach to get inferior faults. As we cannot use select(2) or |
| 73 | signals with Mach port (the Mach communication channel), signals are |
| 74 | reported to gdb as an exception. Furthermore we detect death of the |
| 75 | inferior through a Mach notification message. This way we only wait |
| 76 | on Mach ports. |
| 77 | |
| 78 | Some Mach documentation is available for Apple xnu source package or |
| 79 | from the web. */ |
| 80 | |
| 81 | |
| 82 | #define PTRACE(CMD, PID, ADDR, SIG) \ |
| 83 | darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG)) |
| 84 | |
| 85 | extern boolean_t exc_server (mach_msg_header_t *in, mach_msg_header_t *out); |
| 86 | |
| 87 | static void darwin_stop (ptid_t); |
| 88 | |
| 89 | static void darwin_resume (ptid_t ptid, int step, |
| 90 | enum target_signal signal); |
| 91 | |
| 92 | static void darwin_mourn_inferior (struct target_ops *ops); |
| 93 | |
| 94 | static int darwin_lookup_task (char *args, task_t * ptask, int *ppid); |
| 95 | |
| 96 | static void darwin_kill_inferior (void); |
| 97 | |
| 98 | static void darwin_ptrace_me (void); |
| 99 | |
| 100 | static void darwin_ptrace_him (int pid); |
| 101 | |
| 102 | static void darwin_create_inferior (struct target_ops *ops, char *exec_file, |
| 103 | char *allargs, char **env, int from_tty); |
| 104 | |
| 105 | static void darwin_files_info (struct target_ops *ops); |
| 106 | |
| 107 | static int darwin_thread_alive (ptid_t tpid); |
| 108 | |
| 109 | /* Current inferior. */ |
| 110 | darwin_inferior *darwin_inf = NULL; |
| 111 | |
| 112 | /* Target operations for Darwin. */ |
| 113 | static struct target_ops *darwin_ops; |
| 114 | |
| 115 | /* Task identifier of gdb. */ |
| 116 | static task_t gdb_task; |
| 117 | |
| 118 | /* A copy of mach_host_self (). */ |
| 119 | mach_port_t darwin_host_self; |
| 120 | |
| 121 | /* Exception port. */ |
| 122 | mach_port_t darwin_ex_port; |
| 123 | |
| 124 | /* Notification port. */ |
| 125 | mach_port_t darwin_not_port; |
| 126 | |
| 127 | /* Port set. */ |
| 128 | mach_port_t darwin_port_set; |
| 129 | |
| 130 | /* Page size. */ |
| 131 | static vm_size_t mach_page_size; |
| 132 | |
| 133 | /* If Set, catch all mach exceptions (before they are converted to signals |
| 134 | by the kernel). */ |
| 135 | static int enable_mach_exceptions; |
| 136 | |
| 137 | #define PAGE_TRUNC(x) ((x) & ~(mach_page_size - 1)) |
| 138 | #define PAGE_ROUND(x) PAGE_TRUNC((x) + mach_page_size - 1) |
| 139 | |
| 140 | /* Buffer containing received message and to be sent message. */ |
| 141 | static union |
| 142 | { |
| 143 | mach_msg_header_t hdr; |
| 144 | char data[1024]; |
| 145 | } msgin, msgout; |
| 146 | |
| 147 | /* Current message state. |
| 148 | If the kernel has sent a message it expects a reply and the inferior |
| 149 | can't be killed before. */ |
| 150 | static enum msg_state { NO_MESSAGE, GOT_MESSAGE, REPLY_SENT } msg_state; |
| 151 | |
| 152 | /* Unmarshalled received message. */ |
| 153 | static struct exc_msg |
| 154 | { |
| 155 | /* Receive port. */ |
| 156 | mach_port_t port; |
| 157 | |
| 158 | /* Thread and task taking the exception. */ |
| 159 | mach_port_t thread_port; |
| 160 | mach_port_t task_port; |
| 161 | |
| 162 | /* Type of the exception. */ |
| 163 | exception_type_t ex_type; |
| 164 | |
| 165 | /* Machine dependent details. */ |
| 166 | mach_msg_type_number_t data_count; |
| 167 | integer_t ex_data[4]; |
| 168 | } exc_msg; |
| 169 | |
| 170 | |
| 171 | /* This controls output of inferior debugging. |
| 172 | 1 = basic exception handling |
| 173 | 2 = task management |
| 174 | 3 = thread management |
| 175 | 4 = pending_event_handler |
| 176 | 6 = most chatty level. */ |
| 177 | |
| 178 | static int darwin_debug_flag = 0; |
| 179 | |
| 180 | static void |
| 181 | inferior_debug (int level, const char *fmt, ...) |
| 182 | { |
| 183 | va_list ap; |
| 184 | |
| 185 | if (darwin_debug_flag < level) |
| 186 | return; |
| 187 | |
| 188 | va_start (ap, fmt); |
| 189 | printf_unfiltered (_("[%d inferior]: "), getpid ()); |
| 190 | vprintf_unfiltered (fmt, ap); |
| 191 | va_end (ap); |
| 192 | } |
| 193 | |
| 194 | void |
| 195 | mach_check_error (kern_return_t ret, const char *file, |
| 196 | unsigned int line, const char *func) |
| 197 | { |
| 198 | if (ret == KERN_SUCCESS) |
| 199 | return; |
| 200 | if (func == NULL) |
| 201 | func = _("[UNKNOWN]"); |
| 202 | |
| 203 | error (_("error on line %u of \"%s\" in function \"%s\": %s (0x%lx)\n"), |
| 204 | line, file, func, mach_error_string (ret), (unsigned long) ret); |
| 205 | } |
| 206 | |
| 207 | static const char * |
| 208 | unparse_exception_type (unsigned int i) |
| 209 | { |
| 210 | static char unknown_exception_buf[32]; |
| 211 | |
| 212 | switch (i) |
| 213 | { |
| 214 | case EXC_BAD_ACCESS: |
| 215 | return "EXC_BAD_ACCESS"; |
| 216 | case EXC_BAD_INSTRUCTION: |
| 217 | return "EXC_BAD_INSTRUCTION"; |
| 218 | case EXC_ARITHMETIC: |
| 219 | return "EXC_ARITHMETIC"; |
| 220 | case EXC_EMULATION: |
| 221 | return "EXC_EMULATION"; |
| 222 | case EXC_SOFTWARE: |
| 223 | return "EXC_SOFTWARE"; |
| 224 | case EXC_BREAKPOINT: |
| 225 | return "EXC_BREAKPOINT"; |
| 226 | case EXC_SYSCALL: |
| 227 | return "EXC_SYSCALL"; |
| 228 | case EXC_MACH_SYSCALL: |
| 229 | return "EXC_MACH_SYSCALL"; |
| 230 | case EXC_RPC_ALERT: |
| 231 | return "EXC_RPC_ALERT"; |
| 232 | case EXC_CRASH: |
| 233 | return "EXC_CRASH"; |
| 234 | default: |
| 235 | snprintf (unknown_exception_buf, 32, _("unknown (%d)"), i); |
| 236 | return unknown_exception_buf; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static int |
| 241 | darwin_ptrace (const char *name, |
| 242 | int request, int pid, PTRACE_TYPE_ARG3 arg3, int arg4) |
| 243 | { |
| 244 | int ret; |
| 245 | |
| 246 | ret = ptrace (request, pid, (caddr_t) arg3, arg4); |
| 247 | |
| 248 | inferior_debug (2, _("ptrace (%s, %d, 0x%x, %d): %d (%s)\n"), |
| 249 | name, pid, arg3, arg4, ret, |
| 250 | (ret != 0) ? strerror (errno) : _("no error")); |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | static int |
| 255 | cmp_thread_t (const void *l, const void *r) |
| 256 | { |
| 257 | thread_t lt = *(const thread_t *)l; |
| 258 | thread_t lr = *(const thread_t *)r; |
| 259 | return (int)(lr - lt); |
| 260 | } |
| 261 | |
| 262 | static void |
| 263 | darwin_check_new_threads (darwin_inferior *inf) |
| 264 | { |
| 265 | kern_return_t kret; |
| 266 | unsigned int i; |
| 267 | thread_array_t thread_list; |
| 268 | unsigned int new_nbr; |
| 269 | unsigned int old_nbr; |
| 270 | unsigned int new_ix, old_ix; |
| 271 | VEC (thread_t) *thread_vec; |
| 272 | |
| 273 | /* Get list of threads. */ |
| 274 | kret = task_threads (inf->task, &thread_list, &new_nbr); |
| 275 | MACH_CHECK_ERROR (kret); |
| 276 | if (kret != KERN_SUCCESS) |
| 277 | return; |
| 278 | |
| 279 | if (new_nbr > 1) |
| 280 | qsort (thread_list, new_nbr, sizeof (thread_t), cmp_thread_t); |
| 281 | |
| 282 | thread_vec = VEC_alloc (thread_t, new_nbr); |
| 283 | |
| 284 | if (inf->threads) |
| 285 | old_nbr = VEC_length (thread_t, inf->threads); |
| 286 | else |
| 287 | old_nbr = 0; |
| 288 | |
| 289 | for (new_ix = 0, old_ix = 0; new_ix < new_nbr || old_ix < old_nbr;) |
| 290 | { |
| 291 | thread_t new_id = (new_ix < new_nbr) ? |
| 292 | thread_list[new_ix] : THREAD_NULL; |
| 293 | thread_t old_id = (old_ix < old_nbr) ? |
| 294 | VEC_index (thread_t, inf->threads, old_ix) : THREAD_NULL; |
| 295 | |
| 296 | if (old_id == new_id) |
| 297 | { |
| 298 | /* Thread still exist. */ |
| 299 | VEC_safe_push (thread_t, thread_vec, old_id); |
| 300 | new_ix++; |
| 301 | old_ix++; |
| 302 | |
| 303 | kret = mach_port_deallocate (gdb_task, old_id); |
| 304 | MACH_CHECK_ERROR (kret); |
| 305 | continue; |
| 306 | } |
| 307 | if (new_id < old_id || old_ix == old_nbr) |
| 308 | { |
| 309 | /* A thread was created. */ |
| 310 | struct thread_info *tp; |
| 311 | |
| 312 | tp = add_thread (ptid_build (inf->pid, 0, new_id)); |
| 313 | VEC_safe_push (thread_t, thread_vec, new_id); |
| 314 | new_ix++; |
| 315 | continue; |
| 316 | } |
| 317 | if (new_id > old_id || new_ix == new_nbr) |
| 318 | { |
| 319 | /* A thread was removed. */ |
| 320 | delete_thread (ptid_build (inf->pid, 0, old_id)); |
| 321 | kret = mach_port_deallocate (gdb_task, old_id); |
| 322 | MACH_CHECK_ERROR (kret); |
| 323 | old_ix++; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | if (inf->threads) |
| 328 | VEC_free (thread_t, inf->threads); |
| 329 | inf->threads = thread_vec; |
| 330 | |
| 331 | kret = vm_deallocate (gdb_task, (vm_address_t) thread_list, |
| 332 | new_nbr * sizeof (int)); |
| 333 | MACH_CHECK_ERROR (kret); |
| 334 | } |
| 335 | |
| 336 | static void |
| 337 | darwin_stop (ptid_t t) |
| 338 | { |
| 339 | int ret; |
| 340 | |
| 341 | ret = kill (ptid_get_pid (inferior_ptid), SIGINT); |
| 342 | } |
| 343 | |
| 344 | static void |
| 345 | darwin_resume (ptid_t ptid, int step, enum target_signal signal) |
| 346 | { |
| 347 | struct target_waitstatus status; |
| 348 | int pid; |
| 349 | thread_t thread; |
| 350 | kern_return_t kret; |
| 351 | int res; |
| 352 | |
| 353 | /* minus_one_ptid is RESUME_ALL. */ |
| 354 | if (ptid_equal (ptid, minus_one_ptid)) |
| 355 | ptid = inferior_ptid; |
| 356 | |
| 357 | pid = ptid_get_pid (ptid); |
| 358 | thread = ptid_get_tid (ptid); |
| 359 | |
| 360 | inferior_debug |
| 361 | (2, _("darwin_resume: state=%d, thread=0x%x, step=%d signal=%d\n"), |
| 362 | msg_state, thread, step, signal); |
| 363 | |
| 364 | switch (msg_state) |
| 365 | { |
| 366 | case GOT_MESSAGE: |
| 367 | switch (exc_msg.ex_type) |
| 368 | { |
| 369 | case EXC_SOFTWARE: |
| 370 | if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL) |
| 371 | { |
| 372 | int nsignal = target_signal_to_host (signal); |
| 373 | res = PTRACE (PT_THUPDATE, pid, |
| 374 | (void *)exc_msg.thread_port, nsignal); |
| 375 | if (res < 0) |
| 376 | printf_unfiltered (_("ptrace THUP: res=%d\n"), res); |
| 377 | } |
| 378 | break; |
| 379 | |
| 380 | default: |
| 381 | break; |
| 382 | } |
| 383 | |
| 384 | if (thread != 0) |
| 385 | { |
| 386 | inferior_debug (2, _("darwin_set_sstep (thread=%x, enable=%d)\n"), |
| 387 | thread, step); |
| 388 | darwin_set_sstep (thread, step); |
| 389 | } |
| 390 | |
| 391 | kret = mach_msg (&msgout.hdr, MACH_SEND_MSG | MACH_SEND_INTERRUPT, |
| 392 | msgout.hdr.msgh_size, 0, |
| 393 | MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, |
| 394 | MACH_PORT_NULL); |
| 395 | if (kret != 0) |
| 396 | printf_unfiltered (_("mach_msg (reply) ret=%d\n"), kret); |
| 397 | |
| 398 | msg_state = REPLY_SENT; |
| 399 | break; |
| 400 | |
| 401 | case NO_MESSAGE: |
| 402 | if (step) |
| 403 | res = PTRACE (PT_STEP, pid, (caddr_t)1, 0); |
| 404 | else |
| 405 | res = PTRACE (PT_CONTINUE, pid, (caddr_t)1, 0); |
| 406 | break; |
| 407 | |
| 408 | default: |
| 409 | gdb_assert (0); |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | kern_return_t |
| 414 | catch_exception_raise_state |
| 415 | (mach_port_t port, |
| 416 | exception_type_t exception_type, mach_exception_data_t exception_data, |
| 417 | mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor, |
| 418 | thread_state_t in_state, mach_msg_type_number_t in_state_count, |
| 419 | thread_state_t out_state, mach_msg_type_number_t out_state_count) |
| 420 | { |
| 421 | return KERN_FAILURE; |
| 422 | } |
| 423 | |
| 424 | kern_return_t |
| 425 | catch_exception_raise_state_identity |
| 426 | (mach_port_t port, mach_port_t thread_port, mach_port_t task_port, |
| 427 | exception_type_t exception_type, mach_exception_data_t exception_data, |
| 428 | mach_msg_type_number_t data_count, thread_state_flavor_t * state_flavor, |
| 429 | thread_state_t in_state, mach_msg_type_number_t in_state_count, |
| 430 | thread_state_t out_state, mach_msg_type_number_t out_state_count) |
| 431 | { |
| 432 | kern_return_t kret; |
| 433 | |
| 434 | kret = mach_port_deallocate (mach_task_self (), task_port); |
| 435 | MACH_CHECK_ERROR (kret); |
| 436 | kret = mach_port_deallocate (mach_task_self (), thread_port); |
| 437 | MACH_CHECK_ERROR (kret); |
| 438 | |
| 439 | return KERN_FAILURE; |
| 440 | } |
| 441 | |
| 442 | kern_return_t |
| 443 | catch_exception_raise (mach_port_t port, |
| 444 | mach_port_t thread_port, |
| 445 | mach_port_t task_port, |
| 446 | exception_type_t exception_type, |
| 447 | exception_data_t exception_data, |
| 448 | mach_msg_type_number_t data_count) |
| 449 | { |
| 450 | kern_return_t kret; |
| 451 | int i; |
| 452 | int res; |
| 453 | |
| 454 | /* We got new rights to the task. Get rid of it. */ |
| 455 | kret = mach_port_deallocate (mach_task_self (), task_port); |
| 456 | MACH_CHECK_ERROR (kret); |
| 457 | |
| 458 | inferior_debug |
| 459 | (7, _("catch_exception_raise: exception_type=%d, data_count=%d\n"), |
| 460 | exception_type, data_count); |
| 461 | if (darwin_debug_flag > 7) |
| 462 | { |
| 463 | for (i = 0; i < data_count; i++) |
| 464 | printf_unfiltered (" %08x", exception_data[i]); |
| 465 | printf_unfiltered ("\n"); |
| 466 | } |
| 467 | |
| 468 | /* Save the message. |
| 469 | FIXME: this should be in a per-thread variable. */ |
| 470 | exc_msg.port = port; |
| 471 | exc_msg.thread_port = thread_port; |
| 472 | exc_msg.task_port = task_port; |
| 473 | exc_msg.ex_type = exception_type; |
| 474 | exc_msg.data_count = data_count; |
| 475 | for (i = 0; i < data_count && i < 4; i++) |
| 476 | exc_msg.ex_data[i] = exception_data[i]; |
| 477 | |
| 478 | return KERN_SUCCESS; |
| 479 | } |
| 480 | |
| 481 | static ptid_t |
| 482 | darwin_wait (struct target_ops *ops, |
| 483 | ptid_t ptid, struct target_waitstatus *status) |
| 484 | { |
| 485 | kern_return_t kret; |
| 486 | mach_msg_header_t *hdr = &msgin.hdr; |
| 487 | pid_t pid = ptid_get_pid (inferior_ptid); /* FIXME. */ |
| 488 | |
| 489 | gdb_assert (msg_state != GOT_MESSAGE); |
| 490 | |
| 491 | inferior_debug (6, _("darwin_wait: waiting for a message\n")); |
| 492 | |
| 493 | /* Wait for a message. */ |
| 494 | kret = mach_msg (&msgin.hdr, MACH_RCV_MSG | MACH_RCV_INTERRUPT, 0, |
| 495 | sizeof (msgin.data), darwin_port_set, 0, MACH_PORT_NULL); |
| 496 | |
| 497 | if (kret == MACH_RCV_INTERRUPTED) |
| 498 | { |
| 499 | status->kind = TARGET_WAITKIND_IGNORE; |
| 500 | return minus_one_ptid; |
| 501 | } |
| 502 | |
| 503 | if (kret != MACH_MSG_SUCCESS) |
| 504 | { |
| 505 | inferior_debug (1, _("mach_msg: ret=%x\n"), kret); |
| 506 | status->kind = TARGET_WAITKIND_SPURIOUS; |
| 507 | return minus_one_ptid; |
| 508 | } |
| 509 | |
| 510 | /* Debug: display message. */ |
| 511 | if (darwin_debug_flag > 10) |
| 512 | { |
| 513 | const unsigned long *buf = (unsigned long *) hdr; |
| 514 | unsigned int i; |
| 515 | |
| 516 | printf_unfiltered (_(" bits: 0x%x"), hdr->msgh_bits); |
| 517 | printf_unfiltered (_(", size: 0x%x"), hdr->msgh_size); |
| 518 | printf_unfiltered (_(", remote-port: 0x%x"), hdr->msgh_remote_port); |
| 519 | printf_unfiltered (_(", local-port: 0x%x"), hdr->msgh_local_port); |
| 520 | printf_unfiltered (_(", reserved: 0x%x"), hdr->msgh_reserved); |
| 521 | printf_unfiltered (_(", id: 0x%x\n"), hdr->msgh_id); |
| 522 | |
| 523 | if (darwin_debug_flag > 11) |
| 524 | { |
| 525 | printf_unfiltered (_(" data:")); |
| 526 | for (i = 0; i < hdr->msgh_size; i++) |
| 527 | printf_unfiltered (" %08lx", buf[i]); |
| 528 | printf_unfiltered (_("\n")); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | /* Exception message. */ |
| 533 | if (hdr->msgh_local_port == darwin_ex_port) |
| 534 | { |
| 535 | /* Handle it via the exception server. */ |
| 536 | if (!exc_server (&msgin.hdr, &msgout.hdr)) |
| 537 | { |
| 538 | printf_unfiltered (_("exc_server: unknown message (id=%x)\n"), |
| 539 | hdr->msgh_id); |
| 540 | status->kind = TARGET_WAITKIND_SPURIOUS; |
| 541 | return minus_one_ptid; |
| 542 | } |
| 543 | |
| 544 | status->kind = TARGET_WAITKIND_STOPPED; |
| 545 | |
| 546 | inferior_debug (2, _("darwin_wait: thread=%x, got %s\n"), |
| 547 | exc_msg.thread_port, |
| 548 | unparse_exception_type (exc_msg.ex_type)); |
| 549 | |
| 550 | switch (exc_msg.ex_type) |
| 551 | { |
| 552 | case EXC_BAD_ACCESS: |
| 553 | status->value.sig = TARGET_EXC_BAD_ACCESS; |
| 554 | break; |
| 555 | case EXC_BAD_INSTRUCTION: |
| 556 | status->value.sig = TARGET_EXC_BAD_INSTRUCTION; |
| 557 | break; |
| 558 | case EXC_ARITHMETIC: |
| 559 | status->value.sig = TARGET_EXC_ARITHMETIC; |
| 560 | break; |
| 561 | case EXC_EMULATION: |
| 562 | status->value.sig = TARGET_EXC_EMULATION; |
| 563 | break; |
| 564 | case EXC_SOFTWARE: |
| 565 | if (exc_msg.ex_data[0] == EXC_SOFT_SIGNAL) |
| 566 | { |
| 567 | status->value.sig = target_signal_from_host (exc_msg.ex_data[1]); |
| 568 | inferior_debug (2, _(" (signal %d: %s)\n"), |
| 569 | exc_msg.ex_data[1], |
| 570 | target_signal_to_name (status->value.sig)); |
| 571 | } |
| 572 | else |
| 573 | status->value.sig = TARGET_EXC_SOFTWARE; |
| 574 | break; |
| 575 | case EXC_BREAKPOINT: |
| 576 | /* Many internal GDB routines expect breakpoints to be reported |
| 577 | as TARGET_SIGNAL_TRAP, and will report TARGET_EXC_BREAKPOINT |
| 578 | as a spurious signal. */ |
| 579 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 580 | break; |
| 581 | default: |
| 582 | status->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 583 | break; |
| 584 | } |
| 585 | |
| 586 | msg_state = GOT_MESSAGE; |
| 587 | |
| 588 | return ptid_build (pid, 0, exc_msg.thread_port); |
| 589 | } |
| 590 | else if (hdr->msgh_local_port == darwin_not_port) |
| 591 | { |
| 592 | pid_t res; |
| 593 | int wstatus; |
| 594 | |
| 595 | /* FIXME: translate task port to pid. */ |
| 596 | res = wait4 (pid, &wstatus, 0, NULL); |
| 597 | if (res != pid) |
| 598 | { |
| 599 | printf_unfiltered (_("wait4: res=%x\n"), res); |
| 600 | wstatus = 0; |
| 601 | } |
| 602 | status->kind = TARGET_WAITKIND_EXITED; |
| 603 | status->value.integer = WEXITSTATUS (wstatus); |
| 604 | |
| 605 | inferior_debug (2, _("darwin_wait: pid=%d exit, status=%x\n"), |
| 606 | pid, wstatus); |
| 607 | |
| 608 | msg_state = NO_MESSAGE; |
| 609 | |
| 610 | return ptid; |
| 611 | } |
| 612 | else |
| 613 | { |
| 614 | printf_unfiltered (_("Bad local-port: %x\n"), hdr->msgh_local_port); |
| 615 | status->kind = TARGET_WAITKIND_SPURIOUS; |
| 616 | return minus_one_ptid; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | static void |
| 621 | darwin_mourn_inferior (struct target_ops *ops) |
| 622 | { |
| 623 | struct inferior *inf = current_inferior (); |
| 624 | kern_return_t kret; |
| 625 | mach_port_t prev; |
| 626 | int i; |
| 627 | |
| 628 | unpush_target (darwin_ops); |
| 629 | |
| 630 | /* Deallocate threads. */ |
| 631 | if (darwin_inf->threads) |
| 632 | { |
| 633 | int k; |
| 634 | thread_t t; |
| 635 | for (k = 0; VEC_iterate (thread_t, darwin_inf->threads, k, t); k++) |
| 636 | { |
| 637 | kret = mach_port_deallocate (gdb_task, t); |
| 638 | MACH_CHECK_ERROR (kret); |
| 639 | } |
| 640 | VEC_free (thread_t, darwin_inf->threads); |
| 641 | darwin_inf->threads = NULL; |
| 642 | } |
| 643 | |
| 644 | kret = mach_port_request_notification (gdb_task, darwin_inf->task, |
| 645 | MACH_NOTIFY_DEAD_NAME, 0, |
| 646 | darwin_inf->prev_not_port, |
| 647 | MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| 648 | &prev); |
| 649 | /* This can fail if the task is dead. */ |
| 650 | if (kret == KERN_SUCCESS) |
| 651 | { |
| 652 | kret = mach_port_deallocate (gdb_task, prev); |
| 653 | MACH_CHECK_ERROR (kret); |
| 654 | } |
| 655 | |
| 656 | /* Deallocate saved exception ports. */ |
| 657 | for (i = 0; i < darwin_inf->exception_info.count; i++) |
| 658 | { |
| 659 | kret = mach_port_deallocate |
| 660 | (gdb_task, darwin_inf->exception_info.ports[i]); |
| 661 | MACH_CHECK_ERROR (kret); |
| 662 | } |
| 663 | darwin_inf->exception_info.count = 0; |
| 664 | |
| 665 | kret = mach_port_deallocate (gdb_task, darwin_inf->task); |
| 666 | MACH_CHECK_ERROR (kret); |
| 667 | |
| 668 | darwin_inf->task = 0; |
| 669 | darwin_inf->pid = 0; |
| 670 | |
| 671 | generic_mourn_inferior (); |
| 672 | } |
| 673 | |
| 674 | static void |
| 675 | darwin_stop_inferior (darwin_inferior *inf) |
| 676 | { |
| 677 | struct target_waitstatus wstatus; |
| 678 | ptid_t ptid; |
| 679 | kern_return_t kret; |
| 680 | int status; |
| 681 | int res; |
| 682 | |
| 683 | gdb_assert (inf != NULL); |
| 684 | |
| 685 | kret = task_suspend (inf->task); |
| 686 | MACH_CHECK_ERROR (kret); |
| 687 | |
| 688 | if (msg_state == GOT_MESSAGE) |
| 689 | darwin_resume (inferior_ptid, 0, 0); |
| 690 | |
| 691 | res = kill (inf->pid, SIGSTOP); |
| 692 | if (res != 0) |
| 693 | warning (_("cannot kill: %s\n"), strerror (errno)); |
| 694 | |
| 695 | ptid = darwin_wait (inferior_ptid, &wstatus); |
| 696 | gdb_assert (wstatus.kind = TARGET_WAITKIND_STOPPED); |
| 697 | } |
| 698 | |
| 699 | static void |
| 700 | darwin_kill_inferior (void) |
| 701 | { |
| 702 | struct target_waitstatus wstatus; |
| 703 | ptid_t ptid; |
| 704 | kern_return_t kret; |
| 705 | int status; |
| 706 | int res; |
| 707 | |
| 708 | gdb_assert (darwin_inf != NULL); |
| 709 | |
| 710 | if (ptid_equal (inferior_ptid, null_ptid)) |
| 711 | return; |
| 712 | |
| 713 | darwin_stop_inferior (darwin_inf); |
| 714 | |
| 715 | res = PTRACE (PT_KILL, darwin_inf->pid, 0, 0); |
| 716 | gdb_assert (res == 0); |
| 717 | |
| 718 | if (msg_state == GOT_MESSAGE) |
| 719 | { |
| 720 | exc_msg.ex_type = 0; |
| 721 | darwin_resume (inferior_ptid, 0, 0); |
| 722 | } |
| 723 | |
| 724 | kret = task_resume (darwin_inf->task); |
| 725 | MACH_CHECK_ERROR (kret); |
| 726 | |
| 727 | ptid = darwin_wait (inferior_ptid, &wstatus); |
| 728 | |
| 729 | /* This double wait seems required... */ |
| 730 | res = waitpid (darwin_inf->pid, &status, 0); |
| 731 | gdb_assert (res == darwin_inf->pid); |
| 732 | |
| 733 | msg_state = NO_MESSAGE; |
| 734 | |
| 735 | target_mourn_inferior (); |
| 736 | } |
| 737 | |
| 738 | /* The child must synchronize with gdb: gdb must set the exception port |
| 739 | before the child call PTRACE_SIGEXC. We use a pipe to achieve this. |
| 740 | FIXME: is there a lighter way ? */ |
| 741 | static int ptrace_fds[2]; |
| 742 | |
| 743 | static void |
| 744 | darwin_ptrace_me (void) |
| 745 | { |
| 746 | int res; |
| 747 | char c; |
| 748 | |
| 749 | /* Close write end point. */ |
| 750 | close (ptrace_fds[1]); |
| 751 | |
| 752 | /* Wait until gdb is ready. */ |
| 753 | res = read (ptrace_fds[0], &c, 1); |
| 754 | gdb_assert (res == 0); |
| 755 | close (ptrace_fds[0]); |
| 756 | |
| 757 | /* Get rid of privileges. */ |
| 758 | setegid (getgid ()); |
| 759 | |
| 760 | /* Set TRACEME. */ |
| 761 | PTRACE (PT_TRACE_ME, 0, 0, 0); |
| 762 | |
| 763 | /* Redirect signals to exception port. */ |
| 764 | PTRACE (PT_SIGEXC, 0, 0, 0); |
| 765 | } |
| 766 | |
| 767 | /* Dummy function to be sure fork_inferior uses fork(2) and not vfork(2). */ |
| 768 | static void |
| 769 | darwin_pre_ptrace (void) |
| 770 | { |
| 771 | if (pipe (ptrace_fds) != 0) |
| 772 | { |
| 773 | ptrace_fds[0] = -1; |
| 774 | ptrace_fds[1] = -1; |
| 775 | error (_("unable to create a pipe: %s"), safe_strerror (errno)); |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | static kern_return_t |
| 780 | darwin_save_exception_ports (darwin_inferior *inf) |
| 781 | { |
| 782 | kern_return_t kret; |
| 783 | |
| 784 | inf->exception_info.count = |
| 785 | sizeof (inf->exception_info.ports) / sizeof (inf->exception_info.ports[0]); |
| 786 | |
| 787 | kret = task_get_exception_ports |
| 788 | (inf->task, EXC_MASK_ALL, inf->exception_info.masks, |
| 789 | &inf->exception_info.count, inf->exception_info.ports, |
| 790 | inf->exception_info.behaviors, inf->exception_info.flavors); |
| 791 | return kret; |
| 792 | } |
| 793 | |
| 794 | static kern_return_t |
| 795 | darwin_restore_exception_ports (darwin_inferior *inf) |
| 796 | { |
| 797 | int i; |
| 798 | kern_return_t kret; |
| 799 | |
| 800 | for (i = 0; i < inf->exception_info.count; i++) |
| 801 | { |
| 802 | kret = task_set_exception_ports |
| 803 | (inf->task, inf->exception_info.masks[i], inf->exception_info.ports[i], |
| 804 | inf->exception_info.behaviors[i], inf->exception_info.flavors[i]); |
| 805 | if (kret != KERN_SUCCESS) |
| 806 | return kret; |
| 807 | } |
| 808 | |
| 809 | return KERN_SUCCESS; |
| 810 | } |
| 811 | |
| 812 | static void |
| 813 | darwin_attach_pid (int pid) |
| 814 | { |
| 815 | task_t itask; |
| 816 | kern_return_t kret; |
| 817 | mach_port_t prev_port; |
| 818 | int traps_expected; |
| 819 | exception_mask_t mask; |
| 820 | |
| 821 | kret = task_for_pid (gdb_task, pid, &itask); |
| 822 | if (kret != KERN_SUCCESS) |
| 823 | { |
| 824 | int status; |
| 825 | struct inferior *inf = current_inferior (); |
| 826 | |
| 827 | if (!inf->attach_flag) |
| 828 | { |
| 829 | kill (pid, 9); |
| 830 | waitpid (pid, &status, 0); |
| 831 | } |
| 832 | |
| 833 | error (_("Unable to find Mach task port for process-id %d: %s (0x%lx).\n" |
| 834 | " (please check gdb is setgid procmod)"), |
| 835 | pid, mach_error_string (kret), (unsigned long) kret); |
| 836 | } |
| 837 | |
| 838 | inferior_debug (2, _("inferior task: 0x%08x, pid: %d\n"), itask, pid); |
| 839 | |
| 840 | if (darwin_ex_port == MACH_PORT_NULL) |
| 841 | { |
| 842 | /* Create a port to get exceptions. */ |
| 843 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| 844 | &darwin_ex_port); |
| 845 | gdb_assert (kret == KERN_SUCCESS); |
| 846 | |
| 847 | kret = mach_port_insert_right (gdb_task, darwin_ex_port, darwin_ex_port, |
| 848 | MACH_MSG_TYPE_MAKE_SEND); |
| 849 | gdb_assert (kret == KERN_SUCCESS); |
| 850 | |
| 851 | /* Create a port set and put ex_port in it. */ |
| 852 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_PORT_SET, |
| 853 | &darwin_port_set); |
| 854 | gdb_assert (kret == KERN_SUCCESS); |
| 855 | |
| 856 | kret = mach_port_move_member (gdb_task, darwin_ex_port, darwin_port_set); |
| 857 | gdb_assert (kret == KERN_SUCCESS); |
| 858 | |
| 859 | /* Create a port to be notified when the child task terminates. */ |
| 860 | kret = mach_port_allocate (gdb_task, MACH_PORT_RIGHT_RECEIVE, |
| 861 | &darwin_not_port); |
| 862 | gdb_assert (kret == KERN_SUCCESS); |
| 863 | |
| 864 | kret = mach_port_insert_right (gdb_task, darwin_not_port, darwin_not_port, |
| 865 | MACH_MSG_TYPE_MAKE_SEND); |
| 866 | gdb_assert (kret == KERN_SUCCESS); |
| 867 | |
| 868 | kret = mach_port_move_member (gdb_task, darwin_not_port, darwin_port_set); |
| 869 | gdb_assert (kret == KERN_SUCCESS); |
| 870 | } |
| 871 | |
| 872 | kret = mach_port_request_notification (gdb_task, itask, |
| 873 | MACH_NOTIFY_DEAD_NAME, 0, |
| 874 | darwin_not_port, |
| 875 | MACH_MSG_TYPE_MAKE_SEND_ONCE, |
| 876 | &darwin_inf->prev_not_port); |
| 877 | gdb_assert (kret == KERN_SUCCESS); |
| 878 | |
| 879 | darwin_inf->task = itask; |
| 880 | darwin_inf->pid = pid; |
| 881 | |
| 882 | kret = darwin_save_exception_ports (darwin_inf); |
| 883 | gdb_assert (kret == KERN_SUCCESS); |
| 884 | |
| 885 | /* Set exception port. */ |
| 886 | if (enable_mach_exceptions) |
| 887 | mask = EXC_MASK_ALL; |
| 888 | else |
| 889 | mask = EXC_MASK_SOFTWARE; |
| 890 | kret = task_set_exception_ports |
| 891 | (itask, mask, darwin_ex_port, EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| 892 | gdb_assert (kret == KERN_SUCCESS); |
| 893 | |
| 894 | push_target (darwin_ops); |
| 895 | } |
| 896 | |
| 897 | static void |
| 898 | darwin_init_thread_list (darwin_inferior *inf) |
| 899 | { |
| 900 | thread_t thread; |
| 901 | |
| 902 | darwin_check_new_threads (inf); |
| 903 | |
| 904 | gdb_assert (inf->threads && VEC_length (thread_t, inf->threads) > 0); |
| 905 | thread = VEC_index (thread_t, inf->threads, 0); |
| 906 | inferior_ptid = ptid_build (inf->pid, 0, thread); |
| 907 | } |
| 908 | |
| 909 | static void |
| 910 | darwin_ptrace_him (int pid) |
| 911 | { |
| 912 | task_t itask; |
| 913 | kern_return_t kret; |
| 914 | mach_port_t prev_port; |
| 915 | int traps_expected; |
| 916 | |
| 917 | darwin_attach_pid (pid); |
| 918 | |
| 919 | /* Let's the child run. */ |
| 920 | close (ptrace_fds[0]); |
| 921 | close (ptrace_fds[1]); |
| 922 | |
| 923 | /* fork_inferior automatically add a thread - but it uses a wrong tid. */ |
| 924 | delete_thread_silent (inferior_ptid); |
| 925 | darwin_init_thread_list (darwin_inf); |
| 926 | |
| 927 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| 928 | } |
| 929 | |
| 930 | static void |
| 931 | darwin_create_inferior (struct target_ops *ops, char *exec_file, |
| 932 | char *allargs, char **env, int from_tty) |
| 933 | { |
| 934 | /* Do the hard work. */ |
| 935 | fork_inferior (exec_file, allargs, env, darwin_ptrace_me, darwin_ptrace_him, |
| 936 | darwin_pre_ptrace, NULL); |
| 937 | |
| 938 | /* Return now in case of error. */ |
| 939 | if (ptid_equal (inferior_ptid, null_ptid)) |
| 940 | return; |
| 941 | } |
| 942 | \f |
| 943 | |
| 944 | /* Attach to process PID, then initialize for debugging it |
| 945 | and wait for the trace-trap that results from attaching. */ |
| 946 | static void |
| 947 | darwin_attach (struct target_ops *ops, char *args, int from_tty) |
| 948 | { |
| 949 | pid_t pid; |
| 950 | pid_t pid2; |
| 951 | int wstatus; |
| 952 | int res; |
| 953 | struct inferior *inf; |
| 954 | |
| 955 | gdb_assert (msg_state == NO_MESSAGE); |
| 956 | |
| 957 | if (!args) |
| 958 | error_no_arg (_("process-id to attach")); |
| 959 | |
| 960 | pid = atoi (args); |
| 961 | |
| 962 | if (pid == getpid ()) /* Trying to masturbate? */ |
| 963 | error (_("I refuse to debug myself!")); |
| 964 | |
| 965 | if (from_tty) |
| 966 | printf_unfiltered (_("Attaching to pid %d\n"), pid); |
| 967 | |
| 968 | res = PTRACE (PT_ATTACHEXC, pid, 0, 0); |
| 969 | if (res != 0) |
| 970 | error (_("Unable to attach to process-id %d: %s (%d)"), |
| 971 | pid, strerror (errno), errno); |
| 972 | |
| 973 | inf = add_inferior (pid); |
| 974 | inf->attach_flag = 1; |
| 975 | |
| 976 | darwin_attach_pid (pid); |
| 977 | |
| 978 | pid2 = wait4 (pid, &wstatus, WUNTRACED, NULL); |
| 979 | gdb_assert (pid2 == pid); |
| 980 | inferior_debug (1, _("darwin_attach: wait4 pid=%d, status=0x%x\n"), |
| 981 | pid2, wstatus); |
| 982 | |
| 983 | |
| 984 | darwin_init_thread_list (darwin_inf); |
| 985 | |
| 986 | darwin_check_osabi (darwin_inf, ptid_get_tid (inferior_ptid)); |
| 987 | |
| 988 | /* Looks strange, but the kernel doesn't stop the process... |
| 989 | (Bug in Leopard ?) |
| 990 | Do it manually. */ |
| 991 | /* FIXME: doesn't look to work with multi-threads!! */ |
| 992 | kill (pid, SIGSTOP); |
| 993 | } |
| 994 | |
| 995 | /* Take a program previously attached to and detaches it. |
| 996 | The program resumes execution and will no longer stop |
| 997 | on signals, etc. We'd better not have left any breakpoints |
| 998 | in the program or it'll die when it hits one. For this |
| 999 | to work, it may be necessary for the process to have been |
| 1000 | previously attached. It *might* work if the program was |
| 1001 | started via fork. */ |
| 1002 | static void |
| 1003 | darwin_detach (struct target_ops *ops, char *args, int from_tty) |
| 1004 | { |
| 1005 | kern_return_t kret; |
| 1006 | int res; |
| 1007 | |
| 1008 | if (from_tty) |
| 1009 | { |
| 1010 | char *exec_file = get_exec_file (0); |
| 1011 | if (exec_file == 0) |
| 1012 | exec_file = ""; |
| 1013 | printf_unfiltered (_("Detaching from program: %s, %d\n"), exec_file, |
| 1014 | ptid_get_pid (inferior_ptid)); |
| 1015 | gdb_flush (gdb_stdout); |
| 1016 | } |
| 1017 | |
| 1018 | darwin_stop_inferior (darwin_inf); |
| 1019 | |
| 1020 | kret = darwin_restore_exception_ports (darwin_inf); |
| 1021 | MACH_CHECK_ERROR (kret); |
| 1022 | |
| 1023 | if (msg_state == GOT_MESSAGE) |
| 1024 | { |
| 1025 | exc_msg.ex_type = 0; |
| 1026 | darwin_resume (inferior_ptid, 0, 0); |
| 1027 | } |
| 1028 | |
| 1029 | kret = task_resume (darwin_inf->task); |
| 1030 | gdb_assert (kret == KERN_SUCCESS); |
| 1031 | |
| 1032 | res = PTRACE (PT_DETACH, darwin_inf->pid, 0, 0); |
| 1033 | if (res != 0) |
| 1034 | printf_unfiltered (_("Unable to detach from process-id %d: %s (%d)"), |
| 1035 | darwin_inf->pid, strerror (errno), errno); |
| 1036 | |
| 1037 | msg_state = NO_MESSAGE; |
| 1038 | |
| 1039 | darwin_mourn_inferior (ops); |
| 1040 | } |
| 1041 | |
| 1042 | static void |
| 1043 | darwin_files_info (struct target_ops *ops) |
| 1044 | { |
| 1045 | gdb_assert (darwin_inf != NULL); |
| 1046 | } |
| 1047 | |
| 1048 | static char * |
| 1049 | darwin_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 1050 | { |
| 1051 | static char buf[128]; |
| 1052 | |
| 1053 | snprintf (buf, sizeof (buf), |
| 1054 | _("process %d gdb-thread 0x%lx"), |
| 1055 | (unsigned) ptid_get_pid (ptid), |
| 1056 | (unsigned long) ptid_get_tid (ptid)); |
| 1057 | return buf; |
| 1058 | } |
| 1059 | |
| 1060 | static int |
| 1061 | darwin_thread_alive (ptid_t ptid) |
| 1062 | { |
| 1063 | return 1; |
| 1064 | } |
| 1065 | |
| 1066 | /* If RDADDR is not NULL, read inferior task's LEN bytes from ADDR and |
| 1067 | copy it to RDADDR in gdb's address space. |
| 1068 | If WRADDR is not NULL, write gdb's LEN bytes from WRADDR and copy it |
| 1069 | to ADDR in inferior task's address space. |
| 1070 | Return 0 on failure; number of bytes read / writen otherwise. */ |
| 1071 | static int |
| 1072 | darwin_read_write_inferior (task_t task, CORE_ADDR addr, |
| 1073 | char *rdaddr, const char *wraddr, int length) |
| 1074 | { |
| 1075 | kern_return_t err; |
| 1076 | mach_vm_address_t offset = addr & (mach_page_size - 1); |
| 1077 | mach_vm_address_t low_address = (mach_vm_address_t) (addr - offset); |
| 1078 | mach_vm_size_t aligned_length = (mach_vm_size_t) PAGE_ROUND (offset + length); |
| 1079 | pointer_t copied; |
| 1080 | int copy_count; |
| 1081 | mach_vm_size_t remaining_length; |
| 1082 | mach_vm_address_t region_address; |
| 1083 | mach_vm_size_t region_length; |
| 1084 | |
| 1085 | inferior_debug (8, _("darwin_read_write_inferior(%s, len=%d)\n"), |
| 1086 | core_addr_to_string (addr), length); |
| 1087 | |
| 1088 | /* Get memory from inferior with page aligned addresses */ |
| 1089 | err = mach_vm_read (task, low_address, aligned_length, |
| 1090 | &copied, ©_count); |
| 1091 | if (err != KERN_SUCCESS) |
| 1092 | { |
| 1093 | warning (_("darwin_read_write_inferior: vm_read failed: %s"), |
| 1094 | mach_error_string (err)); |
| 1095 | return 0; |
| 1096 | } |
| 1097 | |
| 1098 | if (rdaddr != NULL) |
| 1099 | memcpy (rdaddr, (char *)copied + offset, length); |
| 1100 | |
| 1101 | if (wraddr == NULL) |
| 1102 | goto out; |
| 1103 | |
| 1104 | memcpy ((char *)copied + offset, wraddr, length); |
| 1105 | |
| 1106 | /* Do writes atomically. |
| 1107 | First check for holes and unwritable memory. */ |
| 1108 | for (region_address = low_address, remaining_length = aligned_length; |
| 1109 | region_address < low_address + aligned_length; |
| 1110 | region_address += region_length, remaining_length -= region_length) |
| 1111 | { |
| 1112 | vm_region_basic_info_data_64_t info; |
| 1113 | mach_port_t object_name; |
| 1114 | mach_vm_address_t old_address = region_address; |
| 1115 | mach_msg_type_number_t count; |
| 1116 | |
| 1117 | region_length = remaining_length; |
| 1118 | count = VM_REGION_BASIC_INFO_COUNT_64; |
| 1119 | err = mach_vm_region (task, ®ion_address, ®ion_length, |
| 1120 | VM_REGION_BASIC_INFO_64, |
| 1121 | (vm_region_info_t) &info, &count, &object_name); |
| 1122 | |
| 1123 | if (err != KERN_SUCCESS) |
| 1124 | { |
| 1125 | warning (_("darwin_write_inferior: mach_vm_region failed: %s"), |
| 1126 | mach_error_string (err)); |
| 1127 | goto out; |
| 1128 | } |
| 1129 | |
| 1130 | /* Check for holes in memory */ |
| 1131 | if (region_address > old_address) |
| 1132 | { |
| 1133 | warning (_("No memory at %s (vs %s+0x%x). Nothing written"), |
| 1134 | core_addr_to_string (old_address), |
| 1135 | core_addr_to_string (region_address), |
| 1136 | (unsigned)region_length); |
| 1137 | length = 0; |
| 1138 | goto out; |
| 1139 | } |
| 1140 | |
| 1141 | if (!(info.max_protection & VM_PROT_WRITE)) |
| 1142 | { |
| 1143 | warning (_("Memory at address %s is unwritable. Nothing written"), |
| 1144 | core_addr_to_string (old_address)); |
| 1145 | length = 0; |
| 1146 | goto out; |
| 1147 | } |
| 1148 | |
| 1149 | if (!(info.protection & VM_PROT_WRITE)) |
| 1150 | { |
| 1151 | err = mach_vm_protect (task, old_address, region_length, |
| 1152 | FALSE, info.protection | VM_PROT_WRITE); |
| 1153 | if (err != KERN_SUCCESS) |
| 1154 | { |
| 1155 | warning |
| 1156 | (_("darwin_read_write_inferior: mach_vm_protect failed: %s"), |
| 1157 | mach_error_string (err)); |
| 1158 | length = 0; |
| 1159 | goto out; |
| 1160 | } |
| 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | err = mach_vm_write (task, low_address, copied, aligned_length); |
| 1165 | |
| 1166 | if (err != KERN_SUCCESS) |
| 1167 | { |
| 1168 | warning (_("darwin_read_write_inferior: mach_vm_write failed: %s"), |
| 1169 | mach_error_string (err)); |
| 1170 | length = 0; |
| 1171 | } |
| 1172 | out: |
| 1173 | mach_vm_deallocate (mach_task_self (), copied, copy_count); |
| 1174 | return length; |
| 1175 | } |
| 1176 | |
| 1177 | \f |
| 1178 | /* Return 0 on failure, number of bytes handled otherwise. TARGET |
| 1179 | is ignored. */ |
| 1180 | static int |
| 1181 | darwin_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int write, |
| 1182 | struct mem_attrib *attrib, struct target_ops *target) |
| 1183 | { |
| 1184 | task_t task = darwin_inf->task; |
| 1185 | |
| 1186 | if (task == MACH_PORT_NULL) |
| 1187 | return 0; |
| 1188 | |
| 1189 | inferior_debug (8, _("darwin_xfer_memory(%s, %d, %c)\n"), |
| 1190 | core_addr_to_string (memaddr), len, write ? 'w' : 'r'); |
| 1191 | |
| 1192 | if (write) |
| 1193 | return darwin_read_write_inferior (task, memaddr, NULL, myaddr, len); |
| 1194 | else |
| 1195 | return darwin_read_write_inferior (task, memaddr, myaddr, NULL, len); |
| 1196 | } |
| 1197 | |
| 1198 | static LONGEST |
| 1199 | darwin_xfer_partial (struct target_ops *ops, |
| 1200 | enum target_object object, const char *annex, |
| 1201 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 1202 | ULONGEST offset, LONGEST len) |
| 1203 | { |
| 1204 | inferior_debug (8, _("darwin_xfer_partial(%s, %d, rbuf=%p, wbuf=%p)\n"), |
| 1205 | core_addr_to_string (offset), (int)len, readbuf, writebuf); |
| 1206 | |
| 1207 | if (object != TARGET_OBJECT_MEMORY) |
| 1208 | return -1; |
| 1209 | |
| 1210 | return darwin_read_write_inferior (darwin_inf->task, offset, |
| 1211 | readbuf, writebuf, len); |
| 1212 | } |
| 1213 | |
| 1214 | static void |
| 1215 | set_enable_mach_exceptions (char *args, int from_tty, |
| 1216 | struct cmd_list_element *c) |
| 1217 | { |
| 1218 | if (darwin_inf && darwin_inf->task != TASK_NULL) |
| 1219 | { |
| 1220 | exception_mask_t mask; |
| 1221 | kern_return_t kret; |
| 1222 | |
| 1223 | if (enable_mach_exceptions) |
| 1224 | mask = EXC_MASK_ALL; |
| 1225 | else |
| 1226 | { |
| 1227 | darwin_restore_exception_ports (darwin_inf); |
| 1228 | mask = EXC_MASK_SOFTWARE; |
| 1229 | } |
| 1230 | kret = task_set_exception_ports (darwin_inf->task, mask, darwin_ex_port, |
| 1231 | EXCEPTION_DEFAULT, THREAD_STATE_NONE); |
| 1232 | MACH_CHECK_ERROR (kret); |
| 1233 | } |
| 1234 | } |
| 1235 | |
| 1236 | void |
| 1237 | _initialize_darwin_inferior () |
| 1238 | { |
| 1239 | kern_return_t kret; |
| 1240 | |
| 1241 | gdb_assert (darwin_inf == NULL); |
| 1242 | |
| 1243 | gdb_task = mach_task_self (); |
| 1244 | darwin_host_self = mach_host_self (); |
| 1245 | |
| 1246 | /* Read page size. */ |
| 1247 | kret = host_page_size (darwin_host_self, &mach_page_size); |
| 1248 | if (kret != KERN_SUCCESS) |
| 1249 | { |
| 1250 | mach_page_size = 0x1000; |
| 1251 | MACH_CHECK_ERROR (kret); |
| 1252 | } |
| 1253 | |
| 1254 | darwin_inf = (struct darwin_inferior *) |
| 1255 | xmalloc (sizeof (struct darwin_inferior)); |
| 1256 | |
| 1257 | memset (darwin_inf, 0, sizeof (*darwin_inf)); |
| 1258 | |
| 1259 | darwin_ops = inf_child_target (); |
| 1260 | |
| 1261 | darwin_ops->to_shortname = "darwin-child"; |
| 1262 | darwin_ops->to_longname = _("Darwin child process"); |
| 1263 | darwin_ops->to_doc = |
| 1264 | _("Darwin child process (started by the \"run\" command)."); |
| 1265 | darwin_ops->to_create_inferior = darwin_create_inferior; |
| 1266 | darwin_ops->to_attach = darwin_attach; |
| 1267 | darwin_ops->to_attach_no_wait = 0; |
| 1268 | darwin_ops->to_detach = darwin_detach; |
| 1269 | darwin_ops->to_files_info = darwin_files_info; |
| 1270 | darwin_ops->to_wait = darwin_wait; |
| 1271 | darwin_ops->to_mourn_inferior = darwin_mourn_inferior; |
| 1272 | darwin_ops->to_kill = darwin_kill_inferior; |
| 1273 | darwin_ops->to_stop = darwin_stop; |
| 1274 | darwin_ops->to_resume = darwin_resume; |
| 1275 | darwin_ops->to_thread_alive = darwin_thread_alive; |
| 1276 | darwin_ops->to_pid_to_str = darwin_pid_to_str; |
| 1277 | darwin_ops->to_load = NULL; |
| 1278 | darwin_ops->deprecated_xfer_memory = darwin_xfer_memory; |
| 1279 | darwin_ops->to_xfer_partial = darwin_xfer_partial; |
| 1280 | darwin_ops->to_has_thread_control = tc_schedlock /*| tc_switch */; |
| 1281 | |
| 1282 | darwin_complete_target (darwin_ops); |
| 1283 | |
| 1284 | add_target (darwin_ops); |
| 1285 | |
| 1286 | inferior_debug (2, _("GDB task: 0x%lx, pid: %d\n"), mach_task_self (), |
| 1287 | getpid ()); |
| 1288 | |
| 1289 | add_setshow_zinteger_cmd ("darwin", class_obscure, |
| 1290 | &darwin_debug_flag, _("\ |
| 1291 | Set if printing inferior communication debugging statements."), _("\ |
| 1292 | Show if printing inferior communication debugging statements."), NULL, |
| 1293 | NULL, NULL, |
| 1294 | &setdebuglist, &showdebuglist); |
| 1295 | |
| 1296 | add_setshow_boolean_cmd ("mach-exceptions", class_support, |
| 1297 | &enable_mach_exceptions, _("\ |
| 1298 | Set if mach exceptions are caught."), _("\ |
| 1299 | Show if mach exceptions are caught."), _("\ |
| 1300 | When this mode is on, all low level exceptions are reported before being\n\ |
| 1301 | reported by the kernel."), |
| 1302 | &set_enable_mach_exceptions, NULL, |
| 1303 | &setlist, &showlist); |
| 1304 | } |