| 1 | /* QNX Neutrino specific low level interface, for the remote server |
| 2 | for GDB. |
| 3 | Copyright (C) 2009 |
| 4 | 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 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 "server.h" |
| 23 | #include "nto-low.h" |
| 24 | |
| 25 | #include <limits.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <spawn.h> |
| 28 | #include <sys/procfs.h> |
| 29 | #include <sys/auxv.h> |
| 30 | #include <stdarg.h> |
| 31 | #include <sys/iomgr.h> |
| 32 | #include <sys/neutrino.h> |
| 33 | |
| 34 | |
| 35 | extern int using_threads; |
| 36 | int using_threads = 1; |
| 37 | |
| 38 | static void |
| 39 | nto_trace (const char *fmt, ...) |
| 40 | { |
| 41 | va_list arg_list; |
| 42 | |
| 43 | if (debug_threads == 0) |
| 44 | return; |
| 45 | fprintf (stderr, "nto:"); |
| 46 | va_start (arg_list, fmt); |
| 47 | vfprintf (stderr, fmt, arg_list); |
| 48 | va_end (arg_list); |
| 49 | } |
| 50 | |
| 51 | #define TRACE nto_trace |
| 52 | |
| 53 | /* Structure holding neutrino specific information about |
| 54 | inferior. */ |
| 55 | |
| 56 | struct nto_inferior |
| 57 | { |
| 58 | char nto_procfs_path[PATH_MAX]; |
| 59 | int ctl_fd; |
| 60 | pid_t pid; |
| 61 | int exit_signo; /* For tracking exit status. */ |
| 62 | }; |
| 63 | |
| 64 | static struct nto_inferior nto_inferior; |
| 65 | |
| 66 | static void |
| 67 | init_nto_inferior (struct nto_inferior *nto_inferior) |
| 68 | { |
| 69 | memset (nto_inferior, 0, sizeof (struct nto_inferior)); |
| 70 | nto_inferior->ctl_fd = -1; |
| 71 | nto_inferior->pid = -1; |
| 72 | } |
| 73 | |
| 74 | static void |
| 75 | do_detach (void) |
| 76 | { |
| 77 | if (nto_inferior.ctl_fd != -1) |
| 78 | { |
| 79 | nto_trace ("Closing fd\n"); |
| 80 | close (nto_inferior.ctl_fd); |
| 81 | init_nto_inferior (&nto_inferior); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /* Set current thread. Return 1 on success, 0 otherwise. */ |
| 86 | |
| 87 | static int |
| 88 | nto_set_thread (ptid_t ptid) |
| 89 | { |
| 90 | int res = 0; |
| 91 | |
| 92 | TRACE ("%s pid: %d tid: %ld\n", __func__, ptid_get_pid (ptid), |
| 93 | ptid_get_lwp (ptid)); |
| 94 | if (nto_inferior.ctl_fd != -1 |
| 95 | && !ptid_equal (ptid, null_ptid) |
| 96 | && !ptid_equal (ptid, minus_one_ptid)) |
| 97 | { |
| 98 | pthread_t tid = ptid_get_lwp (ptid); |
| 99 | |
| 100 | if (EOK == devctl (nto_inferior.ctl_fd, DCMD_PROC_CURTHREAD, &tid, |
| 101 | sizeof (tid), 0)) |
| 102 | res = 1; |
| 103 | else |
| 104 | TRACE ("%s: Error: failed to set current thread\n", __func__); |
| 105 | } |
| 106 | return res; |
| 107 | } |
| 108 | |
| 109 | /* This function will determine all alive threads. Note that we do not list |
| 110 | dead but unjoined threads even though they are still in the process' thread |
| 111 | list. |
| 112 | |
| 113 | NTO_INFERIOR must not be NULL. */ |
| 114 | |
| 115 | static void |
| 116 | nto_find_new_threads (struct nto_inferior *nto_inferior) |
| 117 | { |
| 118 | pthread_t tid; |
| 119 | |
| 120 | TRACE ("%s pid:%d\n", __func__, nto_inferior->pid); |
| 121 | |
| 122 | if (nto_inferior->ctl_fd == -1) |
| 123 | return; |
| 124 | |
| 125 | for (tid = 1;; ++tid) |
| 126 | { |
| 127 | procfs_status status; |
| 128 | ptid_t ptid; |
| 129 | int err; |
| 130 | |
| 131 | status.tid = tid; |
| 132 | err = devctl (nto_inferior->ctl_fd, DCMD_PROC_TIDSTATUS, &status, |
| 133 | sizeof (status), 0); |
| 134 | |
| 135 | if (err != EOK || status.tid == 0) |
| 136 | break; |
| 137 | |
| 138 | /* All threads in between are gone. */ |
| 139 | while (tid != status.tid || status.state == STATE_DEAD) |
| 140 | { |
| 141 | struct thread_info *ti; |
| 142 | |
| 143 | ptid = ptid_build (nto_inferior->pid, tid, 0); |
| 144 | ti = find_thread_ptid (ptid); |
| 145 | if (ti != NULL) |
| 146 | { |
| 147 | TRACE ("Removing thread %d\n", tid); |
| 148 | remove_thread (ti); |
| 149 | } |
| 150 | if (tid == status.tid) |
| 151 | break; |
| 152 | ++tid; |
| 153 | } |
| 154 | |
| 155 | if (status.state != STATE_DEAD) |
| 156 | { |
| 157 | TRACE ("Adding thread %d\n", tid); |
| 158 | ptid = ptid_build (nto_inferior->pid, tid, 0); |
| 159 | if (!find_thread_ptid (ptid)) |
| 160 | add_thread (ptid, NULL); |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | /* Given pid, open procfs path. */ |
| 166 | |
| 167 | static pid_t |
| 168 | do_attach (pid_t pid) |
| 169 | { |
| 170 | procfs_status status; |
| 171 | struct sigevent event; |
| 172 | |
| 173 | if (nto_inferior.ctl_fd != -1) |
| 174 | { |
| 175 | close (nto_inferior.ctl_fd); |
| 176 | init_nto_inferior (&nto_inferior); |
| 177 | } |
| 178 | snprintf (nto_inferior.nto_procfs_path, PATH_MAX - 1, "/proc/%d/as", pid); |
| 179 | nto_inferior.ctl_fd = open (nto_inferior.nto_procfs_path, O_RDWR); |
| 180 | if (nto_inferior.ctl_fd == -1) |
| 181 | { |
| 182 | TRACE ("Failed to open %s\n", nto_inferior.nto_procfs_path); |
| 183 | init_nto_inferior (&nto_inferior); |
| 184 | return -1; |
| 185 | } |
| 186 | if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STOP, &status, sizeof (status), 0) |
| 187 | != EOK) |
| 188 | { |
| 189 | do_detach (); |
| 190 | return -1; |
| 191 | } |
| 192 | nto_inferior.pid = pid; |
| 193 | /* Define a sigevent for process stopped notification. */ |
| 194 | event.sigev_notify = SIGEV_SIGNAL_THREAD; |
| 195 | event.sigev_signo = SIGUSR1; |
| 196 | event.sigev_code = 0; |
| 197 | event.sigev_value.sival_ptr = NULL; |
| 198 | event.sigev_priority = -1; |
| 199 | devctl (nto_inferior.ctl_fd, DCMD_PROC_EVENT, &event, sizeof (event), 0); |
| 200 | |
| 201 | if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), |
| 202 | 0) == EOK |
| 203 | && (status.flags & _DEBUG_FLAG_STOPPED)) |
| 204 | { |
| 205 | ptid_t ptid; |
| 206 | |
| 207 | kill (pid, SIGCONT); |
| 208 | ptid = ptid_build (status.pid, status.tid, 0); |
| 209 | the_low_target.arch_setup (); |
| 210 | add_process (status.pid, 1); |
| 211 | TRACE ("Adding thread: pid=%d tid=%ld\n", status.pid, |
| 212 | ptid_get_lwp (ptid)); |
| 213 | nto_find_new_threads (&nto_inferior); |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | do_detach (); |
| 218 | return -1; |
| 219 | } |
| 220 | |
| 221 | return pid; |
| 222 | } |
| 223 | |
| 224 | /* Read or write LEN bytes from/to inferior's MEMADDR memory address |
| 225 | into gdbservers's MYADDR buffer. Return number of bytes actually |
| 226 | transfered. */ |
| 227 | |
| 228 | static int |
| 229 | nto_xfer_memory (off_t memaddr, unsigned char *myaddr, int len, |
| 230 | int dowrite) |
| 231 | { |
| 232 | int nbytes = 0; |
| 233 | |
| 234 | if (lseek (nto_inferior.ctl_fd, memaddr, SEEK_SET) == memaddr) |
| 235 | { |
| 236 | if (dowrite) |
| 237 | nbytes = write (nto_inferior.ctl_fd, myaddr, len); |
| 238 | else |
| 239 | nbytes = read (nto_inferior.ctl_fd, myaddr, len); |
| 240 | if (nbytes < 0) |
| 241 | nbytes = 0; |
| 242 | } |
| 243 | if (nbytes == 0) |
| 244 | { |
| 245 | int e = errno; |
| 246 | TRACE ("Error in %s : errno=%d (%s)\n", __func__, e, strerror (e)); |
| 247 | } |
| 248 | return nbytes; |
| 249 | } |
| 250 | |
| 251 | /* Insert or remove breakpoint or watchpoint at address ADDR. |
| 252 | TYPE can be one of Neutrino breakpoint types. SIZE must be 0 for |
| 253 | inserting the point, -1 for removing it. |
| 254 | |
| 255 | Return 0 on success, 1 otherwise. */ |
| 256 | |
| 257 | static int |
| 258 | nto_breakpoint (CORE_ADDR addr, int type, int size) |
| 259 | { |
| 260 | procfs_break brk; |
| 261 | |
| 262 | brk.type = type; |
| 263 | brk.addr = addr; |
| 264 | brk.size = size; |
| 265 | if (devctl (nto_inferior.ctl_fd, DCMD_PROC_BREAK, &brk, sizeof (brk), 0) |
| 266 | != EOK) |
| 267 | return 1; |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | /* Read auxiliary vector from inferior's initial stack into gdbserver's |
| 272 | MYADDR buffer, up to LEN bytes. |
| 273 | |
| 274 | Return number of bytes read. */ |
| 275 | |
| 276 | static int |
| 277 | nto_read_auxv_from_initial_stack (CORE_ADDR initial_stack, |
| 278 | unsigned char *myaddr, |
| 279 | unsigned int len) |
| 280 | { |
| 281 | int data_ofs = 0; |
| 282 | int anint; |
| 283 | unsigned int len_read = 0; |
| 284 | |
| 285 | /* Skip over argc, argv and envp... Comment from ldd.c: |
| 286 | |
| 287 | The startup frame is set-up so that we have: |
| 288 | auxv |
| 289 | NULL |
| 290 | ... |
| 291 | envp2 |
| 292 | envp1 <----- void *frame + (argc + 2) * sizeof(char *) |
| 293 | NULL |
| 294 | ... |
| 295 | argv2 |
| 296 | argv1 |
| 297 | argc <------ void * frame |
| 298 | |
| 299 | On entry to ldd, frame gives the address of argc on the stack. */ |
| 300 | if (nto_xfer_memory (initial_stack, (unsigned char *)&anint, |
| 301 | sizeof (anint), 0) != sizeof (anint)) |
| 302 | return 0; |
| 303 | |
| 304 | /* Size of pointer is assumed to be 4 bytes (32 bit arch. ) */ |
| 305 | data_ofs += (anint + 2) * sizeof (void *); /* + 2 comes from argc itself and |
| 306 | NULL terminating pointer in |
| 307 | argv. */ |
| 308 | |
| 309 | /* Now loop over env table: */ |
| 310 | while (nto_xfer_memory (initial_stack + data_ofs, |
| 311 | (unsigned char *)&anint, sizeof (anint), 0) |
| 312 | == sizeof (anint)) |
| 313 | { |
| 314 | data_ofs += sizeof (anint); |
| 315 | if (anint == 0) |
| 316 | break; |
| 317 | } |
| 318 | initial_stack += data_ofs; |
| 319 | |
| 320 | memset (myaddr, 0, len); |
| 321 | while (len_read <= len - sizeof (auxv_t)) |
| 322 | { |
| 323 | auxv_t *auxv = (auxv_t *)myaddr; |
| 324 | |
| 325 | /* Search backwards until we have read AT_PHDR (num. 3), |
| 326 | AT_PHENT (num 4), AT_PHNUM (num 5) */ |
| 327 | if (nto_xfer_memory (initial_stack, (unsigned char *)auxv, |
| 328 | sizeof (auxv_t), 0) == sizeof (auxv_t)) |
| 329 | { |
| 330 | if (auxv->a_type != AT_NULL) |
| 331 | { |
| 332 | auxv++; |
| 333 | len_read += sizeof (auxv_t); |
| 334 | } |
| 335 | if (auxv->a_type == AT_PHNUM) /* That's all we need. */ |
| 336 | break; |
| 337 | initial_stack += sizeof (auxv_t); |
| 338 | } |
| 339 | else |
| 340 | break; |
| 341 | } |
| 342 | TRACE ("auxv: len_read: %d\n", len_read); |
| 343 | return len_read; |
| 344 | } |
| 345 | |
| 346 | /* Start inferior specified by PROGRAM passing arguments ALLARGS. */ |
| 347 | |
| 348 | static int |
| 349 | nto_create_inferior (char *program, char **allargs) |
| 350 | { |
| 351 | struct inheritance inherit; |
| 352 | pid_t pid; |
| 353 | sigset_t set; |
| 354 | |
| 355 | TRACE ("%s %s\n", __func__, program); |
| 356 | /* Clear any pending SIGUSR1's but keep the behavior the same. */ |
| 357 | signal (SIGUSR1, signal (SIGUSR1, SIG_IGN)); |
| 358 | |
| 359 | sigemptyset (&set); |
| 360 | sigaddset (&set, SIGUSR1); |
| 361 | sigprocmask (SIG_UNBLOCK, &set, NULL); |
| 362 | |
| 363 | memset (&inherit, 0, sizeof (inherit)); |
| 364 | inherit.flags |= SPAWN_SETGROUP | SPAWN_HOLD; |
| 365 | inherit.pgroup = SPAWN_NEWPGROUP; |
| 366 | pid = spawnp (program, 0, NULL, &inherit, allargs, 0); |
| 367 | sigprocmask (SIG_BLOCK, &set, NULL); |
| 368 | |
| 369 | if (pid == -1) |
| 370 | return -1; |
| 371 | |
| 372 | if (do_attach (pid) != pid) |
| 373 | return -1; |
| 374 | |
| 375 | return pid; |
| 376 | } |
| 377 | |
| 378 | /* Attach to process PID. */ |
| 379 | |
| 380 | static int |
| 381 | nto_attach (unsigned long pid) |
| 382 | { |
| 383 | TRACE ("%s %ld\n", __func__, pid); |
| 384 | if (do_attach (pid) != pid) |
| 385 | error ("Unable to attach to %ld\n", pid); |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | /* Send signal to process PID. */ |
| 390 | |
| 391 | static int |
| 392 | nto_kill (int pid) |
| 393 | { |
| 394 | TRACE ("%s %d\n", __func__, pid); |
| 395 | kill (pid, SIGKILL); |
| 396 | do_detach (); |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | /* Detach from process PID. */ |
| 401 | |
| 402 | static int |
| 403 | nto_detach (int pid) |
| 404 | { |
| 405 | TRACE ("%s %d\n", __func__, pid); |
| 406 | do_detach (); |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /* Check if the given thread is alive. |
| 411 | |
| 412 | Return 1 if alive, 0 otherwise. */ |
| 413 | |
| 414 | static int |
| 415 | nto_thread_alive (ptid_t ptid) |
| 416 | { |
| 417 | int res; |
| 418 | |
| 419 | TRACE ("%s pid:%d tid:%d\n", __func__, ptid_get_pid (ptid), |
| 420 | ptid_get_lwp (ptid)); |
| 421 | if (SignalKill (0, ptid_get_pid (ptid), ptid_get_lwp (ptid), |
| 422 | 0, 0, 0) == -1) |
| 423 | res = 0; |
| 424 | else |
| 425 | res = 1; |
| 426 | TRACE ("%s: %s\n", __func__, res ? "yes" : "no"); |
| 427 | return res; |
| 428 | } |
| 429 | |
| 430 | /* Resume inferior's execution. */ |
| 431 | |
| 432 | static void |
| 433 | nto_resume (struct thread_resume *resume_info, size_t n) |
| 434 | { |
| 435 | /* We can only work in all-stop mode. */ |
| 436 | procfs_status status; |
| 437 | procfs_run run; |
| 438 | int err; |
| 439 | |
| 440 | TRACE ("%s\n", __func__); |
| 441 | /* Workaround for aliasing rules violation. */ |
| 442 | sigset_t *run_fault = (sigset_t *) (void *) &run.fault; |
| 443 | |
| 444 | nto_set_thread (resume_info->thread); |
| 445 | |
| 446 | run.flags = _DEBUG_RUN_FAULT | _DEBUG_RUN_TRACE; |
| 447 | if (resume_info->kind == resume_step) |
| 448 | run.flags |= _DEBUG_RUN_STEP; |
| 449 | run.flags |= _DEBUG_RUN_ARM; |
| 450 | |
| 451 | sigemptyset (run_fault); |
| 452 | sigaddset (run_fault, FLTBPT); |
| 453 | sigaddset (run_fault, FLTTRACE); |
| 454 | sigaddset (run_fault, FLTILL); |
| 455 | sigaddset (run_fault, FLTPRIV); |
| 456 | sigaddset (run_fault, FLTBOUNDS); |
| 457 | sigaddset (run_fault, FLTIOVF); |
| 458 | sigaddset (run_fault, FLTIZDIV); |
| 459 | sigaddset (run_fault, FLTFPE); |
| 460 | sigaddset (run_fault, FLTPAGE); |
| 461 | sigaddset (run_fault, FLTSTACK); |
| 462 | sigaddset (run_fault, FLTACCESS); |
| 463 | |
| 464 | sigemptyset (&run.trace); |
| 465 | if (resume_info->sig) |
| 466 | { |
| 467 | int signal_to_pass; |
| 468 | |
| 469 | devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), |
| 470 | 0); |
| 471 | signal_to_pass = resume_info->sig; |
| 472 | if (status.why & (_DEBUG_WHY_SIGNALLED | _DEBUG_WHY_FAULTED)) |
| 473 | { |
| 474 | if (signal_to_pass != status.info.si_signo) |
| 475 | { |
| 476 | kill (status.pid, signal_to_pass); |
| 477 | run.flags |= _DEBUG_RUN_CLRFLT | _DEBUG_RUN_CLRSIG; |
| 478 | } |
| 479 | else /* Let it kill the program without telling us. */ |
| 480 | sigdelset (&run.trace, signal_to_pass); |
| 481 | } |
| 482 | } |
| 483 | else |
| 484 | run.flags |= _DEBUG_RUN_CLRSIG | _DEBUG_RUN_CLRFLT; |
| 485 | |
| 486 | sigfillset (&run.trace); |
| 487 | |
| 488 | regcache_invalidate (); |
| 489 | |
| 490 | err = devctl (nto_inferior.ctl_fd, DCMD_PROC_RUN, &run, sizeof (run), 0); |
| 491 | if (err != EOK) |
| 492 | TRACE ("Error: %d \"%s\"\n", err, strerror (err)); |
| 493 | } |
| 494 | |
| 495 | /* Wait for inferior's event. |
| 496 | |
| 497 | Return ptid of thread that caused the event. */ |
| 498 | |
| 499 | static ptid_t |
| 500 | nto_wait (ptid_t ptid, |
| 501 | struct target_waitstatus *ourstatus, int target_options) |
| 502 | { |
| 503 | sigset_t set; |
| 504 | siginfo_t info; |
| 505 | procfs_status status; |
| 506 | const int trace_mask = (_DEBUG_FLAG_TRACE_EXEC | _DEBUG_FLAG_TRACE_RD |
| 507 | | _DEBUG_FLAG_TRACE_WR | _DEBUG_FLAG_TRACE_MODIFY); |
| 508 | |
| 509 | TRACE ("%s\n", __func__); |
| 510 | |
| 511 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 512 | |
| 513 | sigemptyset (&set); |
| 514 | sigaddset (&set, SIGUSR1); |
| 515 | |
| 516 | devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), 0); |
| 517 | while (!(status.flags & _DEBUG_FLAG_ISTOP)) |
| 518 | { |
| 519 | sigwaitinfo (&set, &info); |
| 520 | devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, sizeof (status), |
| 521 | 0); |
| 522 | } |
| 523 | nto_find_new_threads (&nto_inferior); |
| 524 | |
| 525 | if (status.flags & _DEBUG_FLAG_SSTEP) |
| 526 | { |
| 527 | TRACE ("SSTEP\n"); |
| 528 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 529 | ourstatus->value.sig = TARGET_SIGNAL_TRAP; |
| 530 | } |
| 531 | /* Was it a breakpoint? */ |
| 532 | else if (status.flags & trace_mask) |
| 533 | { |
| 534 | TRACE ("STOPPED\n"); |
| 535 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 536 | ourstatus->value.sig = TARGET_SIGNAL_TRAP; |
| 537 | } |
| 538 | else if (status.flags & _DEBUG_FLAG_ISTOP) |
| 539 | { |
| 540 | TRACE ("ISTOP\n"); |
| 541 | switch (status.why) |
| 542 | { |
| 543 | case _DEBUG_WHY_SIGNALLED: |
| 544 | TRACE (" SIGNALLED\n"); |
| 545 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 546 | ourstatus->value.sig = |
| 547 | target_signal_from_host (status.info.si_signo); |
| 548 | nto_inferior.exit_signo = ourstatus->value.sig; |
| 549 | break; |
| 550 | case _DEBUG_WHY_FAULTED: |
| 551 | TRACE (" FAULTED\n"); |
| 552 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 553 | if (status.info.si_signo == SIGTRAP) |
| 554 | { |
| 555 | ourstatus->value.sig = 0; |
| 556 | nto_inferior.exit_signo = 0; |
| 557 | } |
| 558 | else |
| 559 | { |
| 560 | ourstatus->value.sig = |
| 561 | target_signal_from_host (status.info.si_signo); |
| 562 | nto_inferior.exit_signo = ourstatus->value.sig; |
| 563 | } |
| 564 | break; |
| 565 | |
| 566 | case _DEBUG_WHY_TERMINATED: |
| 567 | { |
| 568 | int waitval = 0; |
| 569 | |
| 570 | TRACE (" TERMINATED\n"); |
| 571 | waitpid (ptid_get_pid (ptid), &waitval, WNOHANG); |
| 572 | if (nto_inferior.exit_signo) |
| 573 | { |
| 574 | /* Abnormal death. */ |
| 575 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 576 | ourstatus->value.sig = nto_inferior.exit_signo; |
| 577 | } |
| 578 | else |
| 579 | { |
| 580 | /* Normal death. */ |
| 581 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 582 | ourstatus->value.integer = WEXITSTATUS (waitval); |
| 583 | } |
| 584 | nto_inferior.exit_signo = 0; |
| 585 | break; |
| 586 | } |
| 587 | |
| 588 | case _DEBUG_WHY_REQUESTED: |
| 589 | TRACE ("REQUESTED\n"); |
| 590 | /* We are assuming a requested stop is due to a SIGINT. */ |
| 591 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 592 | ourstatus->value.sig = TARGET_SIGNAL_INT; |
| 593 | nto_inferior.exit_signo = 0; |
| 594 | break; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | return ptid_build (status.pid, status.tid, 0); |
| 599 | } |
| 600 | |
| 601 | /* Fetch inferior's registers for currently selected thread (CURRENT_INFERIOR). |
| 602 | If REGNO is -1, fetch all registers, or REGNO register only otherwise. */ |
| 603 | |
| 604 | static void |
| 605 | nto_fetch_registers (int regno) |
| 606 | { |
| 607 | int regsize; |
| 608 | procfs_greg greg; |
| 609 | ptid_t ptid; |
| 610 | |
| 611 | TRACE ("%s (regno=%d)\n", __func__, regno); |
| 612 | if (regno >= the_low_target.num_regs) |
| 613 | return; |
| 614 | |
| 615 | if (current_inferior == NULL) |
| 616 | { |
| 617 | TRACE ("current_inferior is NULL\n"); |
| 618 | return; |
| 619 | } |
| 620 | ptid = thread_to_gdb_id (current_inferior); |
| 621 | if (!nto_set_thread (ptid)) |
| 622 | return; |
| 623 | |
| 624 | if (devctl (nto_inferior.ctl_fd, DCMD_PROC_GETGREG, &greg, sizeof (greg), |
| 625 | ®size) == EOK) |
| 626 | { |
| 627 | if (regno == -1) /* All registers. */ |
| 628 | { |
| 629 | for (regno = 0; regno != the_low_target.num_regs; ++regno) |
| 630 | { |
| 631 | const unsigned int registeroffset |
| 632 | = the_low_target.register_offset (regno); |
| 633 | supply_register (regno, ((char *)&greg) + registeroffset); |
| 634 | } |
| 635 | } |
| 636 | else |
| 637 | { |
| 638 | const unsigned int registeroffset |
| 639 | = the_low_target.register_offset (regno); |
| 640 | if (registeroffset == -1) |
| 641 | return; |
| 642 | supply_register (regno, ((char *)&greg) + registeroffset); |
| 643 | } |
| 644 | } |
| 645 | else |
| 646 | TRACE ("ERROR reading registers from inferior.\n"); |
| 647 | } |
| 648 | |
| 649 | /* Store registers for currently selected thread (CURRENT_INFERIOR). |
| 650 | We always store all registers, regardless of REGNO. */ |
| 651 | |
| 652 | static void |
| 653 | nto_store_registers (int regno) |
| 654 | { |
| 655 | procfs_greg greg; |
| 656 | int err; |
| 657 | ptid_t ptid; |
| 658 | |
| 659 | TRACE ("%s (regno:%d)\n", __func__, regno); |
| 660 | |
| 661 | if (current_inferior == NULL) |
| 662 | { |
| 663 | TRACE ("current_inferior is NULL\n"); |
| 664 | return; |
| 665 | } |
| 666 | ptid = thread_to_gdb_id (current_inferior); |
| 667 | if (!nto_set_thread (ptid)) |
| 668 | return; |
| 669 | |
| 670 | memset (&greg, 0, sizeof (greg)); |
| 671 | for (regno = 0; regno != the_low_target.num_regs; ++regno) |
| 672 | { |
| 673 | const unsigned int regoffset |
| 674 | = the_low_target.register_offset (regno); |
| 675 | collect_register (regno, ((char *)&greg) + regoffset); |
| 676 | } |
| 677 | err = devctl (nto_inferior.ctl_fd, DCMD_PROC_SETGREG, &greg, sizeof (greg), |
| 678 | 0); |
| 679 | if (err != EOK) |
| 680 | TRACE ("Error: setting registers.\n"); |
| 681 | } |
| 682 | |
| 683 | /* Read LEN bytes from inferior's memory address MEMADDR into |
| 684 | gdbserver's MYADDR buffer. |
| 685 | |
| 686 | Return 0 on success -1 otherwise. */ |
| 687 | |
| 688 | static int |
| 689 | nto_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| 690 | { |
| 691 | TRACE ("%s memaddr:0x%08lx, len:%d\n", __func__, memaddr, len); |
| 692 | |
| 693 | if (nto_xfer_memory (memaddr, myaddr, len, 0) != len) |
| 694 | { |
| 695 | TRACE ("Failed to read memory\n"); |
| 696 | return -1; |
| 697 | } |
| 698 | |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | /* Write LEN bytes from gdbserver's buffer MYADDR into inferior's |
| 703 | memory at address MEMADDR. |
| 704 | |
| 705 | Return 0 on success -1 otherwise. */ |
| 706 | |
| 707 | static int |
| 708 | nto_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len) |
| 709 | { |
| 710 | int len_written; |
| 711 | |
| 712 | TRACE ("%s memaddr: 0x%08llx len: %d\n", __func__, memaddr, len); |
| 713 | if ((len_written = nto_xfer_memory (memaddr, (unsigned char *)myaddr, len, |
| 714 | 1)) |
| 715 | != len) |
| 716 | { |
| 717 | TRACE ("Wanted to write: %d but written: %d\n", len, len_written); |
| 718 | return -1; |
| 719 | } |
| 720 | |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | /* Stop inferior. We always stop all threads. */ |
| 725 | |
| 726 | static void |
| 727 | nto_request_interrupt (void) |
| 728 | { |
| 729 | TRACE ("%s\n", __func__); |
| 730 | nto_set_thread (ptid_build (nto_inferior.pid, 1, 0)); |
| 731 | if (EOK != devctl (nto_inferior.ctl_fd, DCMD_PROC_STOP, NULL, 0, 0)) |
| 732 | TRACE ("Error stopping inferior.\n"); |
| 733 | } |
| 734 | |
| 735 | /* Read auxiliary vector from inferior's memory into gdbserver's buffer |
| 736 | MYADDR. We always read whole auxv. |
| 737 | |
| 738 | Return number of bytes stored in MYADDR buffer, 0 if OFFSET > 0 |
| 739 | or -1 on error. */ |
| 740 | |
| 741 | static int |
| 742 | nto_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len) |
| 743 | { |
| 744 | int err; |
| 745 | CORE_ADDR initial_stack; |
| 746 | procfs_info procinfo; |
| 747 | |
| 748 | TRACE ("%s\n", __func__); |
| 749 | if (offset > 0) |
| 750 | return 0; |
| 751 | |
| 752 | err = devctl (nto_inferior.ctl_fd, DCMD_PROC_INFO, &procinfo, |
| 753 | sizeof procinfo, 0); |
| 754 | if (err != EOK) |
| 755 | return -1; |
| 756 | |
| 757 | initial_stack = procinfo.initial_stack; |
| 758 | |
| 759 | return nto_read_auxv_from_initial_stack (initial_stack, myaddr, len); |
| 760 | } |
| 761 | |
| 762 | /* Insert {break/watch}point at address ADDR. |
| 763 | TYPE must be in '0'..'4' range. LEN is not used. */ |
| 764 | |
| 765 | static int |
| 766 | nto_insert_point (char type, CORE_ADDR addr, int len) |
| 767 | { |
| 768 | int wtype = _DEBUG_BREAK_HW; /* Always request HW. */ |
| 769 | |
| 770 | TRACE ("%s type:%c addr: 0x%08lx len:%d\n", __func__, (int)type, addr, len); |
| 771 | switch (type) |
| 772 | { |
| 773 | case '0': /* software-breakpoint */ |
| 774 | wtype = _DEBUG_BREAK_EXEC; |
| 775 | break; |
| 776 | case '1': /* hardware-breakpoint */ |
| 777 | wtype |= _DEBUG_BREAK_EXEC; |
| 778 | break; |
| 779 | case '2': /* write watchpoint */ |
| 780 | wtype |= _DEBUG_BREAK_RW; |
| 781 | break; |
| 782 | case '3': /* read watchpoint */ |
| 783 | wtype |= _DEBUG_BREAK_RD; |
| 784 | break; |
| 785 | case '4': /* access watchpoint */ |
| 786 | wtype |= _DEBUG_BREAK_RW; |
| 787 | break; |
| 788 | default: |
| 789 | return 1; /* Not supported. */ |
| 790 | } |
| 791 | return nto_breakpoint (addr, wtype, 0); |
| 792 | } |
| 793 | |
| 794 | /* Remove {break/watch}point at address ADDR. |
| 795 | TYPE must be in '0'..'4' range. LEN is not used. */ |
| 796 | |
| 797 | static int |
| 798 | nto_remove_point (char type, CORE_ADDR addr, int len) |
| 799 | { |
| 800 | int wtype = _DEBUG_BREAK_HW; /* Always request HW. */ |
| 801 | |
| 802 | TRACE ("%s type:%c addr: 0x%08lx len:%d\n", __func__, (int)type, addr, len); |
| 803 | switch (type) |
| 804 | { |
| 805 | case '0': /* software-breakpoint */ |
| 806 | wtype = _DEBUG_BREAK_EXEC; |
| 807 | break; |
| 808 | case '1': /* hardware-breakpoint */ |
| 809 | wtype |= _DEBUG_BREAK_EXEC; |
| 810 | break; |
| 811 | case '2': /* write watchpoint */ |
| 812 | wtype |= _DEBUG_BREAK_RW; |
| 813 | break; |
| 814 | case '3': /* read watchpoint */ |
| 815 | wtype |= _DEBUG_BREAK_RD; |
| 816 | break; |
| 817 | case '4': /* access watchpoint */ |
| 818 | wtype |= _DEBUG_BREAK_RW; |
| 819 | break; |
| 820 | default: |
| 821 | return 1; /* Not supported. */ |
| 822 | } |
| 823 | return nto_breakpoint (addr, wtype, -1); |
| 824 | } |
| 825 | |
| 826 | /* Check if the reason of stop for current thread (CURRENT_INFERIOR) is |
| 827 | a watchpoint. |
| 828 | |
| 829 | Return 1 if stopped by watchpoint, 0 otherwise. */ |
| 830 | |
| 831 | static int |
| 832 | nto_stopped_by_watchpoint (void) |
| 833 | { |
| 834 | int ret = 0; |
| 835 | |
| 836 | TRACE ("%s\n", __func__); |
| 837 | if (nto_inferior.ctl_fd != -1 && current_inferior != NULL) |
| 838 | { |
| 839 | ptid_t ptid; |
| 840 | |
| 841 | ptid = thread_to_gdb_id (current_inferior); |
| 842 | if (nto_set_thread (ptid)) |
| 843 | { |
| 844 | const int watchmask = _DEBUG_FLAG_TRACE_RD | _DEBUG_FLAG_TRACE_WR |
| 845 | | _DEBUG_FLAG_TRACE_MODIFY; |
| 846 | procfs_status status; |
| 847 | int err; |
| 848 | |
| 849 | err = devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, |
| 850 | sizeof (status), 0); |
| 851 | if (err == EOK && (status.flags & watchmask)) |
| 852 | ret = 1; |
| 853 | } |
| 854 | } |
| 855 | TRACE ("%s: %s\n", __func__, ret ? "yes" : "no"); |
| 856 | return ret; |
| 857 | } |
| 858 | |
| 859 | /* Get instruction pointer for CURRENT_INFERIOR thread. |
| 860 | |
| 861 | Return inferior's instruction pointer value, or 0 on error. */ |
| 862 | |
| 863 | static CORE_ADDR |
| 864 | nto_stopped_data_address (void) |
| 865 | { |
| 866 | CORE_ADDR ret = (CORE_ADDR)0; |
| 867 | |
| 868 | TRACE ("%s\n", __func__); |
| 869 | if (nto_inferior.ctl_fd != -1 && current_inferior != NULL) |
| 870 | { |
| 871 | ptid_t ptid; |
| 872 | |
| 873 | ptid = thread_to_gdb_id (current_inferior); |
| 874 | |
| 875 | if (nto_set_thread (ptid)) |
| 876 | { |
| 877 | procfs_status status; |
| 878 | |
| 879 | if (devctl (nto_inferior.ctl_fd, DCMD_PROC_STATUS, &status, |
| 880 | sizeof (status), 0) == EOK) |
| 881 | ret = status.ip; |
| 882 | } |
| 883 | } |
| 884 | TRACE ("%s: 0x%08lx\n", __func__, ret); |
| 885 | return ret; |
| 886 | } |
| 887 | |
| 888 | /* We do not currently support non-stop. */ |
| 889 | |
| 890 | static int |
| 891 | nto_supports_non_stop (void) |
| 892 | { |
| 893 | TRACE ("%s\n", __func__); |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | |
| 898 | |
| 899 | static struct target_ops nto_target_ops = { |
| 900 | nto_create_inferior, |
| 901 | nto_attach, |
| 902 | nto_kill, |
| 903 | nto_detach, |
| 904 | NULL, /* nto_join */ |
| 905 | nto_thread_alive, |
| 906 | nto_resume, |
| 907 | nto_wait, |
| 908 | nto_fetch_registers, |
| 909 | nto_store_registers, |
| 910 | nto_read_memory, |
| 911 | nto_write_memory, |
| 912 | NULL, /* nto_look_up_symbols */ |
| 913 | nto_request_interrupt, |
| 914 | nto_read_auxv, |
| 915 | nto_insert_point, |
| 916 | nto_remove_point, |
| 917 | nto_stopped_by_watchpoint, |
| 918 | nto_stopped_data_address, |
| 919 | NULL, /* nto_read_offsets */ |
| 920 | NULL, /* thread_db_set_tls_address */ |
| 921 | NULL, |
| 922 | hostio_last_error_from_errno, |
| 923 | NULL, /* nto_qxfer_osdata */ |
| 924 | NULL, /* xfer_siginfo */ |
| 925 | nto_supports_non_stop, |
| 926 | NULL, /* async */ |
| 927 | NULL /* start_non_stop */ |
| 928 | }; |
| 929 | |
| 930 | |
| 931 | /* Global function called by server.c. Initializes QNX Neutrino |
| 932 | gdbserver. */ |
| 933 | |
| 934 | void |
| 935 | initialize_low (void) |
| 936 | { |
| 937 | sigset_t set; |
| 938 | |
| 939 | TRACE ("%s\n", __func__); |
| 940 | set_target_ops (&nto_target_ops); |
| 941 | set_breakpoint_data (the_low_target.breakpoint, |
| 942 | the_low_target.breakpoint_len); |
| 943 | |
| 944 | /* We use SIGUSR1 to gain control after we block waiting for a process. |
| 945 | We use sigwaitevent to wait. */ |
| 946 | sigemptyset (&set); |
| 947 | sigaddset (&set, SIGUSR1); |
| 948 | sigprocmask (SIG_BLOCK, &set, NULL); |
| 949 | } |
| 950 | |