| 1 | /* Low level Unix child interface to ptrace, for GDB when running under Unix. |
| 2 | |
| 3 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
| 4 | 1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc. |
| 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 2 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, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "observer.h" |
| 25 | #include "gdb_ptrace.h" |
| 26 | #include "inflow.h" |
| 27 | #include "inferior.h" |
| 28 | #include "regcache.h" |
| 29 | #include "command.h" |
| 30 | #include "gdbcore.h" |
| 31 | #include "inf-child.h" |
| 32 | #include "gdbcmd.h" |
| 33 | #include "gdb_string.h" |
| 34 | |
| 35 | #include <sys/wait.h> |
| 36 | #include <signal.h> |
| 37 | |
| 38 | /* HACK: Save the ptrace ops returned by ptrace_target. */ |
| 39 | static struct target_ops *ptrace_ops_hack; |
| 40 | |
| 41 | static void |
| 42 | inf_ptrace_kill_inferior (void) |
| 43 | { |
| 44 | int status; |
| 45 | int pid = PIDGET (inferior_ptid); |
| 46 | |
| 47 | if (pid == 0) |
| 48 | return; |
| 49 | |
| 50 | /* This once used to call "kill" to kill the inferior just in case |
| 51 | the inferior was still running. As others have noted in the past |
| 52 | (kingdon) there shouldn't be any way to get here if the inferior |
| 53 | is still running -- else there's a major problem elsewere in gdb |
| 54 | and it needs to be fixed. |
| 55 | |
| 56 | The kill call causes problems under hpux10, so it's been removed; |
| 57 | if this causes problems we'll deal with them as they arise. */ |
| 58 | ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0); |
| 59 | wait (&status); |
| 60 | target_mourn_inferior (); |
| 61 | } |
| 62 | |
| 63 | /* Resume execution of the inferior process. If STEP is nonzero, |
| 64 | single-step it. If SIGNAL is nonzero, give it that signal. */ |
| 65 | |
| 66 | static void |
| 67 | inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal) |
| 68 | { |
| 69 | int request = PT_CONTINUE; |
| 70 | int pid = PIDGET (ptid); |
| 71 | |
| 72 | if (pid == -1) |
| 73 | /* Resume all threads. */ |
| 74 | /* I think this only gets used in the non-threaded case, where |
| 75 | "resume all threads" and "resume inferior_ptid" are the |
| 76 | same. */ |
| 77 | pid = PIDGET (inferior_ptid); |
| 78 | |
| 79 | if (step) |
| 80 | { |
| 81 | /* If this system does not support PT_STEP, a higher level |
| 82 | function will have called single_step() to transmute the step |
| 83 | request into a continue request (by setting breakpoints on |
| 84 | all possible successor instructions), so we don't have to |
| 85 | worry about that here. */ |
| 86 | request = PT_STEP; |
| 87 | } |
| 88 | |
| 89 | /* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from |
| 90 | where it was. If GDB wanted it to start some other way, we have |
| 91 | already written a new PC value to the child. */ |
| 92 | errno = 0; |
| 93 | ptrace (request, pid, (PTRACE_TYPE_ARG3) 1, target_signal_to_host (signal)); |
| 94 | if (errno != 0) |
| 95 | perror_with_name ("ptrace"); |
| 96 | } |
| 97 | |
| 98 | /* Set an upper limit on alloca. */ |
| 99 | #define GDB_MAX_ALLOCA 0x1000 |
| 100 | |
| 101 | /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory |
| 102 | in the NEW_SUN_PTRACE case. It ought to be straightforward. But |
| 103 | it appears that writing did not write the data that I specified. I |
| 104 | cannot understand where it got the data that it actually did |
| 105 | write. */ |
| 106 | |
| 107 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR to |
| 108 | debugger memory starting at MYADDR. Copy to inferior if WRITE is |
| 109 | nonzero. TARGET is ignored. |
| 110 | |
| 111 | Returns the length copied, which is either the LEN argument or |
| 112 | zero. This xfer function does not do partial moves, since |
| 113 | ptrace_ops_hack doesn't allow memory operations to cross below us in the |
| 114 | target stack anyway. */ |
| 115 | |
| 116 | int |
| 117 | inf_ptrace_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
| 118 | struct mem_attrib *attrib, struct target_ops *target) |
| 119 | { |
| 120 | int i; |
| 121 | /* Round starting address down to longword boundary. */ |
| 122 | CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_TYPE_RET); |
| 123 | /* Round ending address up; get number of longwords that makes. */ |
| 124 | int count = ((((memaddr + len) - addr) + sizeof (PTRACE_TYPE_RET) - 1) |
| 125 | / sizeof (PTRACE_TYPE_RET)); |
| 126 | int alloc = count * sizeof (PTRACE_TYPE_RET); |
| 127 | PTRACE_TYPE_RET *buffer; |
| 128 | struct cleanup *old_chain = NULL; |
| 129 | |
| 130 | #ifdef PT_IO |
| 131 | /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request |
| 132 | that promises to be much more efficient in reading and writing |
| 133 | data in the traced process's address space. */ |
| 134 | |
| 135 | { |
| 136 | struct ptrace_io_desc piod; |
| 137 | |
| 138 | /* NOTE: We assume that there are no distinct address spaces for |
| 139 | instruction and data. */ |
| 140 | piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; |
| 141 | piod.piod_offs = (void *) memaddr; |
| 142 | piod.piod_addr = myaddr; |
| 143 | piod.piod_len = len; |
| 144 | |
| 145 | if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) & piod, 0) == -1) |
| 146 | { |
| 147 | /* If the PT_IO request is somehow not supported, fallback on |
| 148 | using PT_WRITE_D/PT_READ_D. Otherwise we will return zero |
| 149 | to indicate failure. */ |
| 150 | if (errno != EINVAL) |
| 151 | return 0; |
| 152 | } |
| 153 | else |
| 154 | { |
| 155 | /* Return the actual number of bytes read or written. */ |
| 156 | return piod.piod_len; |
| 157 | } |
| 158 | } |
| 159 | #endif |
| 160 | |
| 161 | /* Allocate buffer of that many longwords. */ |
| 162 | if (len < GDB_MAX_ALLOCA) |
| 163 | { |
| 164 | buffer = (PTRACE_TYPE_RET *) alloca (alloc); |
| 165 | } |
| 166 | else |
| 167 | { |
| 168 | buffer = (PTRACE_TYPE_RET *) xmalloc (alloc); |
| 169 | old_chain = make_cleanup (xfree, buffer); |
| 170 | } |
| 171 | |
| 172 | if (write) |
| 173 | { |
| 174 | /* Fill start and end extra bytes of buffer with existing memory |
| 175 | data. */ |
| 176 | if (addr != memaddr || len < (int) sizeof (PTRACE_TYPE_RET)) |
| 177 | { |
| 178 | /* Need part of initial word -- fetch it. */ |
| 179 | buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid), |
| 180 | (PTRACE_TYPE_ARG3) addr, 0); |
| 181 | } |
| 182 | |
| 183 | if (count > 1) /* FIXME, avoid if even boundary. */ |
| 184 | { |
| 185 | buffer[count - 1] = |
| 186 | ptrace (PT_READ_I, PIDGET (inferior_ptid), |
| 187 | ((PTRACE_TYPE_ARG3) |
| 188 | (addr + (count - 1) * sizeof (PTRACE_TYPE_RET))), 0); |
| 189 | } |
| 190 | |
| 191 | /* Copy data to be written over corresponding part of buffer. */ |
| 192 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 193 | myaddr, len); |
| 194 | |
| 195 | /* Write the entire buffer. */ |
| 196 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 197 | { |
| 198 | errno = 0; |
| 199 | ptrace (PT_WRITE_D, PIDGET (inferior_ptid), |
| 200 | (PTRACE_TYPE_ARG3) addr, buffer[i]); |
| 201 | if (errno) |
| 202 | { |
| 203 | /* Using the appropriate one (I or D) is necessary for |
| 204 | Gould NP1, at least. */ |
| 205 | errno = 0; |
| 206 | ptrace (PT_WRITE_I, PIDGET (inferior_ptid), |
| 207 | (PTRACE_TYPE_ARG3) addr, buffer[i]); |
| 208 | } |
| 209 | if (errno) |
| 210 | return 0; |
| 211 | } |
| 212 | } |
| 213 | else |
| 214 | { |
| 215 | /* Read all the longwords. */ |
| 216 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_TYPE_RET)) |
| 217 | { |
| 218 | errno = 0; |
| 219 | buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid), |
| 220 | (PTRACE_TYPE_ARG3) addr, 0); |
| 221 | if (errno) |
| 222 | return 0; |
| 223 | QUIT; |
| 224 | } |
| 225 | |
| 226 | /* Copy appropriate bytes out of the buffer. */ |
| 227 | memcpy (myaddr, |
| 228 | (char *) buffer + (memaddr & (sizeof (PTRACE_TYPE_RET) - 1)), |
| 229 | len); |
| 230 | } |
| 231 | |
| 232 | if (old_chain != NULL) |
| 233 | do_cleanups (old_chain); |
| 234 | return len; |
| 235 | } |
| 236 | |
| 237 | /* Wait for child to do something. Return pid of child, or -1 in case |
| 238 | of error; store status through argument pointer OURSTATUS. */ |
| 239 | |
| 240 | static ptid_t |
| 241 | inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus) |
| 242 | { |
| 243 | int save_errno; |
| 244 | int status; |
| 245 | char *execd_pathname = NULL; |
| 246 | int exit_status; |
| 247 | int related_pid; |
| 248 | int syscall_id; |
| 249 | enum target_waitkind kind; |
| 250 | int pid; |
| 251 | |
| 252 | do |
| 253 | { |
| 254 | set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| 255 | attached process. */ |
| 256 | set_sigio_trap (); |
| 257 | |
| 258 | pid = wait (&status); |
| 259 | target_post_wait (pid_to_ptid (pid), status); |
| 260 | |
| 261 | save_errno = errno; |
| 262 | |
| 263 | clear_sigio_trap (); |
| 264 | |
| 265 | clear_sigint_trap (); |
| 266 | |
| 267 | if (pid == -1) |
| 268 | { |
| 269 | if (save_errno == EINTR) |
| 270 | continue; |
| 271 | |
| 272 | fprintf_unfiltered (gdb_stderr, |
| 273 | "Child process unexpectedly missing: %s.\n", |
| 274 | safe_strerror (save_errno)); |
| 275 | |
| 276 | /* Claim it exited with unknown signal. */ |
| 277 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 278 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 279 | return pid_to_ptid (-1); |
| 280 | } |
| 281 | |
| 282 | /* Did it exit? |
| 283 | */ |
| 284 | if (target_has_exited (pid, status, &exit_status)) |
| 285 | { |
| 286 | /* ??rehrauer: For now, ignore this. */ |
| 287 | continue; |
| 288 | } |
| 289 | |
| 290 | if (!target_thread_alive (pid_to_ptid (pid))) |
| 291 | { |
| 292 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 293 | return pid_to_ptid (pid); |
| 294 | } |
| 295 | } |
| 296 | while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */ |
| 297 | |
| 298 | store_waitstatus (ourstatus, status); |
| 299 | return pid_to_ptid (pid); |
| 300 | } |
| 301 | |
| 302 | void |
| 303 | inf_ptrace_post_wait (ptid_t ptid, int wait_status) |
| 304 | { |
| 305 | /* This version of Unix doesn't require a meaningful "post wait" |
| 306 | operation. |
| 307 | */ |
| 308 | } |
| 309 | |
| 310 | /* Check to see if the given thread is alive. |
| 311 | |
| 312 | FIXME: Is kill() ever the right way to do this? I doubt it, but |
| 313 | for now we're going to try and be compatable with the old thread |
| 314 | code. */ |
| 315 | |
| 316 | static int |
| 317 | inf_ptrace_thread_alive (ptid_t ptid) |
| 318 | { |
| 319 | pid_t pid = PIDGET (ptid); |
| 320 | |
| 321 | return (kill (pid, 0) != -1); |
| 322 | } |
| 323 | |
| 324 | /* Attach to process PID, then initialize for debugging it. */ |
| 325 | |
| 326 | static void |
| 327 | inf_ptrace_attach (char *args, int from_tty) |
| 328 | { |
| 329 | char *exec_file; |
| 330 | int pid; |
| 331 | char *dummy; |
| 332 | |
| 333 | if (!args) |
| 334 | error_no_arg ("process-id to attach"); |
| 335 | |
| 336 | dummy = args; |
| 337 | pid = strtol (args, &dummy, 0); |
| 338 | /* Some targets don't set errno on errors, grrr! */ |
| 339 | if ((pid == 0) && (args == dummy)) |
| 340 | error ("Illegal process-id: %s\n", args); |
| 341 | |
| 342 | if (pid == getpid ()) /* Trying to masturbate? */ |
| 343 | error ("I refuse to debug myself!"); |
| 344 | |
| 345 | if (from_tty) |
| 346 | { |
| 347 | exec_file = (char *) get_exec_file (0); |
| 348 | |
| 349 | if (exec_file) |
| 350 | printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, |
| 351 | target_pid_to_str (pid_to_ptid (pid))); |
| 352 | else |
| 353 | printf_unfiltered ("Attaching to %s\n", |
| 354 | target_pid_to_str (pid_to_ptid (pid))); |
| 355 | |
| 356 | gdb_flush (gdb_stdout); |
| 357 | } |
| 358 | |
| 359 | attach (pid); |
| 360 | |
| 361 | inferior_ptid = pid_to_ptid (pid); |
| 362 | push_target (ptrace_ops_hack); |
| 363 | } |
| 364 | |
| 365 | static void |
| 366 | inf_ptrace_post_attach (int pid) |
| 367 | { |
| 368 | /* This version of Unix doesn't require a meaningful "post attach" |
| 369 | operation by a debugger. */ |
| 370 | } |
| 371 | |
| 372 | /* Take a program previously attached to and detaches it. The program |
| 373 | resumes execution and will no longer stop on signals, etc. We'd |
| 374 | better not have left any breakpoints in the program or it'll die |
| 375 | when it hits one. For this to work, it may be necessary for the |
| 376 | process to have been previously attached. It *might* work if the |
| 377 | program was started via the normal ptrace (PTRACE_TRACEME). */ |
| 378 | |
| 379 | static void |
| 380 | inf_ptrace_detach (char *args, int from_tty) |
| 381 | { |
| 382 | int siggnal = 0; |
| 383 | int pid = PIDGET (inferior_ptid); |
| 384 | |
| 385 | if (from_tty) |
| 386 | { |
| 387 | char *exec_file = get_exec_file (0); |
| 388 | if (exec_file == 0) |
| 389 | exec_file = ""; |
| 390 | printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, |
| 391 | target_pid_to_str (pid_to_ptid (pid))); |
| 392 | gdb_flush (gdb_stdout); |
| 393 | } |
| 394 | if (args) |
| 395 | siggnal = atoi (args); |
| 396 | |
| 397 | detach (siggnal); |
| 398 | |
| 399 | inferior_ptid = null_ptid; |
| 400 | unpush_target (ptrace_ops_hack); |
| 401 | } |
| 402 | |
| 403 | /* Get ready to modify the registers array. On machines which store |
| 404 | individual registers, this doesn't need to do anything. On |
| 405 | machines which store all the registers in one fell swoop, this |
| 406 | makes sure that registers contains all the registers from the |
| 407 | program being debugged. */ |
| 408 | |
| 409 | static void |
| 410 | inf_ptrace_prepare_to_store (void) |
| 411 | { |
| 412 | } |
| 413 | |
| 414 | /* Print status information about what we're accessing. */ |
| 415 | |
| 416 | static void |
| 417 | inf_ptrace_files_info (struct target_ops *ignore) |
| 418 | { |
| 419 | printf_unfiltered ("\tUsing the running image of %s %s.\n", |
| 420 | attach_flag ? "attached" : "child", |
| 421 | target_pid_to_str (inferior_ptid)); |
| 422 | } |
| 423 | |
| 424 | static void |
| 425 | inf_ptrace_open (char *arg, int from_tty) |
| 426 | { |
| 427 | error ("Use the \"run\" command to start a Unix child process."); |
| 428 | } |
| 429 | |
| 430 | /* Stub function which causes the inferior that runs it, to be ptrace-able |
| 431 | by its parent process. */ |
| 432 | |
| 433 | static void |
| 434 | inf_ptrace_me (void) |
| 435 | { |
| 436 | /* "Trace me, Dr. Memory!" */ |
| 437 | ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0); |
| 438 | } |
| 439 | |
| 440 | /* Stub function which causes the GDB that runs it, to start ptrace-ing |
| 441 | the child process. */ |
| 442 | |
| 443 | static void |
| 444 | inf_ptrace_him (int pid) |
| 445 | { |
| 446 | push_target (ptrace_ops_hack); |
| 447 | |
| 448 | /* On some targets, there must be some explicit synchronization |
| 449 | between the parent and child processes after the debugger |
| 450 | forks, and before the child execs the debuggee program. This |
| 451 | call basically gives permission for the child to exec. |
| 452 | */ |
| 453 | |
| 454 | target_acknowledge_created_inferior (pid); |
| 455 | |
| 456 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, |
| 457 | * and will be 1 or 2 depending on whether we're starting |
| 458 | * without or with a shell. |
| 459 | */ |
| 460 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| 461 | |
| 462 | /* On some targets, there must be some explicit actions taken after |
| 463 | the inferior has been started up. |
| 464 | */ |
| 465 | target_post_startup_inferior (pid_to_ptid (pid)); |
| 466 | } |
| 467 | |
| 468 | /* Start an inferior Unix child process and sets inferior_ptid to its |
| 469 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing |
| 470 | the arguments to the program. ENV is the environment vector to |
| 471 | pass. Errors reported with error(). */ |
| 472 | |
| 473 | static void |
| 474 | inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env, |
| 475 | int from_tty) |
| 476 | { |
| 477 | fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him, |
| 478 | NULL, NULL); |
| 479 | /* We are at the first instruction we care about. */ |
| 480 | observer_notify_inferior_created (¤t_target, from_tty); |
| 481 | /* Pedal to the metal... */ |
| 482 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
| 483 | } |
| 484 | |
| 485 | static void |
| 486 | inf_ptrace_post_startup_inferior (ptid_t ptid) |
| 487 | { |
| 488 | /* This version of Unix doesn't require a meaningful "post startup inferior" |
| 489 | operation by a debugger. |
| 490 | */ |
| 491 | } |
| 492 | |
| 493 | static void |
| 494 | inf_ptrace_acknowledge_created_inferior (int pid) |
| 495 | { |
| 496 | /* This version of Unix doesn't require a meaningful "acknowledge created inferior" |
| 497 | operation by a debugger. |
| 498 | */ |
| 499 | } |
| 500 | |
| 501 | static int |
| 502 | inf_ptrace_insert_fork_catchpoint (int pid) |
| 503 | { |
| 504 | /* This version of Unix doesn't support notification of fork events. */ |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | static int |
| 509 | inf_ptrace_remove_fork_catchpoint (int pid) |
| 510 | { |
| 511 | /* This version of Unix doesn't support notification of fork events. */ |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static int |
| 516 | inf_ptrace_insert_vfork_catchpoint (int pid) |
| 517 | { |
| 518 | /* This version of Unix doesn't support notification of vfork events. */ |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static int |
| 523 | inf_ptrace_remove_vfork_catchpoint (int pid) |
| 524 | { |
| 525 | /* This version of Unix doesn't support notification of vfork events. */ |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static int |
| 530 | inf_ptrace_follow_fork (int follow_child) |
| 531 | { |
| 532 | /* This version of Unix doesn't support following fork or vfork events. */ |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static int |
| 537 | inf_ptrace_insert_exec_catchpoint (int pid) |
| 538 | { |
| 539 | /* This version of Unix doesn't support notification of exec events. */ |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static int |
| 544 | inf_ptrace_remove_exec_catchpoint (int pid) |
| 545 | { |
| 546 | /* This version of Unix doesn't support notification of exec events. */ |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | static int |
| 551 | inf_ptrace_reported_exec_events_per_exec_call (void) |
| 552 | { |
| 553 | /* This version of Unix doesn't support notification of exec events. |
| 554 | */ |
| 555 | return 1; |
| 556 | } |
| 557 | |
| 558 | static int |
| 559 | inf_ptrace_has_exited (int pid, int wait_status, int *exit_status) |
| 560 | { |
| 561 | if (WIFEXITED (wait_status)) |
| 562 | { |
| 563 | *exit_status = WEXITSTATUS (wait_status); |
| 564 | return 1; |
| 565 | } |
| 566 | |
| 567 | if (WIFSIGNALED (wait_status)) |
| 568 | { |
| 569 | *exit_status = 0; /* ?? Don't know what else to say here. */ |
| 570 | return 1; |
| 571 | } |
| 572 | |
| 573 | /* ?? Do we really need to consult the event state, too? Assume the |
| 574 | wait_state alone suffices. |
| 575 | */ |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | static void |
| 580 | inf_ptrace_mourn_inferior (void) |
| 581 | { |
| 582 | unpush_target (ptrace_ops_hack); |
| 583 | generic_mourn_inferior (); |
| 584 | } |
| 585 | |
| 586 | static int |
| 587 | inf_ptrace_can_run (void) |
| 588 | { |
| 589 | return 1; |
| 590 | } |
| 591 | |
| 592 | /* Send a SIGINT to the process group. This acts just like the user |
| 593 | typed a ^C on the controlling terminal. |
| 594 | |
| 595 | XXX - This may not be correct for all systems. Some may want to |
| 596 | use killpg() instead of kill (-pgrp). */ |
| 597 | |
| 598 | static void |
| 599 | inf_ptrace_stop (void) |
| 600 | { |
| 601 | kill (-inferior_process_group, SIGINT); |
| 602 | } |
| 603 | |
| 604 | /* Perform a partial transfer to/from the specified object. For |
| 605 | memory transfers, fall back to the old memory xfer functions. */ |
| 606 | |
| 607 | static LONGEST |
| 608 | inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object, |
| 609 | const char *annex, void *readbuf, |
| 610 | const void *writebuf, ULONGEST offset, LONGEST len) |
| 611 | { |
| 612 | switch (object) |
| 613 | { |
| 614 | case TARGET_OBJECT_MEMORY: |
| 615 | if (readbuf) |
| 616 | return inf_ptrace_xfer_memory (offset, readbuf, len, 0 /*write */ , |
| 617 | NULL, ops); |
| 618 | if (writebuf) |
| 619 | return inf_ptrace_xfer_memory (offset, readbuf, len, 1 /*write */ , |
| 620 | NULL, ops); |
| 621 | return -1; |
| 622 | |
| 623 | case TARGET_OBJECT_UNWIND_TABLE: |
| 624 | return -1; |
| 625 | |
| 626 | case TARGET_OBJECT_AUXV: |
| 627 | return -1; |
| 628 | |
| 629 | case TARGET_OBJECT_WCOOKIE: |
| 630 | return -1; |
| 631 | |
| 632 | default: |
| 633 | return -1; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | static char * |
| 638 | inf_ptrace_pid_to_str (ptid_t ptid) |
| 639 | { |
| 640 | return normal_pid_to_str (ptid); |
| 641 | } |
| 642 | |
| 643 | struct target_ops * |
| 644 | inf_ptrace_target (void) |
| 645 | { |
| 646 | struct target_ops *t = inf_child_target (); |
| 647 | t->to_open = inf_ptrace_open; |
| 648 | t->to_attach = inf_ptrace_attach; |
| 649 | t->to_post_attach = inf_ptrace_post_attach; |
| 650 | t->to_detach = inf_ptrace_detach; |
| 651 | t->to_resume = inf_ptrace_resume; |
| 652 | t->to_wait = inf_ptrace_wait; |
| 653 | t->to_post_wait = inf_ptrace_post_wait; |
| 654 | t->to_prepare_to_store = inf_ptrace_prepare_to_store; |
| 655 | t->to_xfer_memory = inf_ptrace_xfer_memory; |
| 656 | t->to_xfer_partial = inf_ptrace_xfer_partial; |
| 657 | t->to_files_info = inf_ptrace_files_info; |
| 658 | t->to_kill = inf_ptrace_kill_inferior; |
| 659 | t->to_create_inferior = inf_ptrace_create_inferior; |
| 660 | t->to_post_startup_inferior = inf_ptrace_post_startup_inferior; |
| 661 | t->to_acknowledge_created_inferior = |
| 662 | inf_ptrace_acknowledge_created_inferior; |
| 663 | t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint; |
| 664 | t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint; |
| 665 | t->to_insert_vfork_catchpoint = inf_ptrace_insert_vfork_catchpoint; |
| 666 | t->to_remove_vfork_catchpoint = inf_ptrace_remove_vfork_catchpoint; |
| 667 | t->to_follow_fork = inf_ptrace_follow_fork; |
| 668 | t->to_insert_exec_catchpoint = inf_ptrace_insert_exec_catchpoint; |
| 669 | t->to_remove_exec_catchpoint = inf_ptrace_remove_exec_catchpoint; |
| 670 | t->to_reported_exec_events_per_exec_call = |
| 671 | inf_ptrace_reported_exec_events_per_exec_call; |
| 672 | t->to_has_exited = inf_ptrace_has_exited; |
| 673 | t->to_mourn_inferior = inf_ptrace_mourn_inferior; |
| 674 | t->to_can_run = inf_ptrace_can_run; |
| 675 | t->to_thread_alive = inf_ptrace_thread_alive; |
| 676 | t->to_pid_to_str = inf_ptrace_pid_to_str; |
| 677 | t->to_stop = inf_ptrace_stop; |
| 678 | t->to_stratum = process_stratum; |
| 679 | t->to_has_all_memory = 1; |
| 680 | t->to_has_memory = 1; |
| 681 | t->to_has_stack = 1; |
| 682 | t->to_has_registers = 1; |
| 683 | t->to_has_execution = 1; |
| 684 | t->to_magic = OPS_MAGIC; |
| 685 | ptrace_ops_hack = t; |
| 686 | return t; |
| 687 | } |