lib/libthread_db/libthr_db.c

   1 /*
   2  * Copyright (c) 2004 Marcel Moolenaar
   3  * Copyright (c) 2005 David Xu
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <proc_service.h>
  32 #include <stddef.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sys/types.h>
  36 #include <sys/ptrace.h>
  37 #include <thread_db.h>
  38 #include <unistd.h>
  39
  40 #include "thread_db_int.h"
  41
  42 #define TERMINATED      1
  43
  44 struct td_thragent {
  45         TD_THRAGENT_FIELDS;
  46         psaddr_t        libthr_debug_addr;
  47         psaddr_t        thread_list_addr;
  48         psaddr_t        thread_active_threads_addr;
  49         psaddr_t        thread_keytable_addr;
  50         psaddr_t        thread_last_event_addr;
  51         psaddr_t        thread_event_mask_addr;
  52         psaddr_t        thread_bp_create_addr;
  53         psaddr_t        thread_bp_death_addr;
  54         int             thread_off_dtv;
  55         int             thread_off_tlsindex;
  56         int             thread_off_attr_flags;
  57         int             thread_size_key;
  58         int             thread_off_tcb;
  59         int             thread_off_linkmap;
  60         int             thread_off_next;
  61         int             thread_off_state;
  62         int             thread_off_tid;
  63         int             thread_max_keys;
  64         int             thread_off_key_allocated;
  65         int             thread_off_key_destructor;
  66         int             thread_off_report_events;
  67         int             thread_off_event_mask;
  68         int             thread_off_event_buf;
  69         int             thread_state_zoombie;
  70         int             thread_state_running;
  71 };
  72
  73 #define P2T(c) ps2td(c)
  74
  75 static int pt_validate(const td_thrhandle_t *th);
  76
  77 static int
  78 ps2td(int c)
  79 {
  80         switch (c) {
  81         case PS_OK:
  82                 return TD_OK;
  83         case PS_ERR:
  84                 return TD_ERR;
  85         case PS_BADPID:
  86                 return TD_BADPH;
  87         case PS_BADLID:
  88                 return TD_NOLWP;
  89         case PS_BADADDR:
  90                 return TD_ERR;
  91         case PS_NOSYM:
  92                 return TD_NOLIBTHREAD;
  93         case PS_NOFREGS:
  94                 return TD_NOFPREGS;
  95         default:
  96                 return TD_ERR;
  97         }
  98 }
  99
 100 static td_err_e
 101 pt_init(void)
 102 {
 103         return (0);
 104 }
 105
 106 static td_err_e
 107 pt_ta_new(struct ps_prochandle *ph, td_thragent_t **pta)
 108 {
 109 #define LOOKUP_SYM(proc, sym, addr)                     \
 110         ret = ps_pglobal_lookup(proc, NULL, sym, addr); \
 111         if (ret != 0) {                                 \
 112                 TDBG("can not find symbol: %s\n", sym); \
 113                 ret = TD_NOLIBTHREAD;                   \
 114                 goto error;                             \
 115         }
 116
 117 #define LOOKUP_VAL(proc, sym, val)                      \
 118         ret = ps_pglobal_lookup(proc, NULL, sym, &vaddr);\
 119         if (ret != 0) {                                 \
 120                 TDBG("can not find symbol: %s\n", sym); \
 121                 ret = TD_NOLIBTHREAD;                   \
 122                 goto error;                             \
 123         }                                               \
 124         ret = ps_pread(proc, vaddr, val, sizeof(int));  \
 125         if (ret != 0) {                                 \
 126                 TDBG("can not read value of %s\n", sym);\
 127                 ret = TD_NOLIBTHREAD;                   \
 128                 goto error;                             \
 129         }
 130
 131         td_thragent_t *ta;
 132         psaddr_t vaddr;
 133         int dbg;
 134         int ret;
 135
 136         TDBG_FUNC();
 137
 138         ta = malloc(sizeof(td_thragent_t));
 139         if (ta == NULL)
 140                 return (TD_MALLOC);
 141
 142         ta->ph = ph;
 143
 144         LOOKUP_SYM(ph, "_libthr_debug",         &ta->libthr_debug_addr);
 145         LOOKUP_SYM(ph, "_thread_list",          &ta->thread_list_addr);
 146         LOOKUP_SYM(ph, "_thread_active_threads",&ta->thread_active_threads_addr);
 147         LOOKUP_SYM(ph, "_thread_keytable",      &ta->thread_keytable_addr);
 148         LOOKUP_SYM(ph, "_thread_last_event",    &ta->thread_last_event_addr);
 149         LOOKUP_SYM(ph, "_thread_event_mask",    &ta->thread_event_mask_addr);
 150         LOOKUP_SYM(ph, "_thread_bp_create",     &ta->thread_bp_create_addr);
 151         LOOKUP_SYM(ph, "_thread_bp_death",      &ta->thread_bp_death_addr);
 152         LOOKUP_VAL(ph, "_thread_off_dtv",       &ta->thread_off_dtv);
 153         LOOKUP_VAL(ph, "_thread_off_tlsindex",  &ta->thread_off_tlsindex);
 154         LOOKUP_VAL(ph, "_thread_off_attr_flags",        &ta->thread_off_attr_flags);
 155         LOOKUP_VAL(ph, "_thread_size_key",      &ta->thread_size_key);
 156         LOOKUP_VAL(ph, "_thread_off_tcb",       &ta->thread_off_tcb);
 157         LOOKUP_VAL(ph, "_thread_off_tid",       &ta->thread_off_tid);
 158         LOOKUP_VAL(ph, "_thread_off_linkmap",   &ta->thread_off_linkmap);
 159         LOOKUP_VAL(ph, "_thread_off_next",      &ta->thread_off_next);
 160         LOOKUP_VAL(ph, "_thread_off_state",     &ta->thread_off_state);
 161         LOOKUP_VAL(ph, "_thread_max_keys",      &ta->thread_max_keys);
 162         LOOKUP_VAL(ph, "_thread_off_key_allocated", &ta->thread_off_key_allocated);
 163         LOOKUP_VAL(ph, "_thread_off_key_destructor", &ta->thread_off_key_destructor);
 164         LOOKUP_VAL(ph, "_thread_state_running", &ta->thread_state_running);
 165         LOOKUP_VAL(ph, "_thread_state_zoombie", &ta->thread_state_zoombie);
 166         LOOKUP_VAL(ph, "_thread_off_report_events", &ta->thread_off_report_events);
 167         LOOKUP_VAL(ph, "_thread_off_event_mask", &ta->thread_off_event_mask);
 168         LOOKUP_VAL(ph, "_thread_off_event_buf", &ta->thread_off_event_buf);
 169         dbg = getpid();
 170         /*
 171          * If this fails it probably means we're debugging a core file and
 172          * can't write to it.
 173          */
 174         ps_pwrite(ph, ta->libthr_debug_addr, &dbg, sizeof(int));
 175         *pta = ta;
 176         return (0);
 177
 178 error:
 179         free(ta);
 180         return (ret);
 181 }
 182
 183 static td_err_e
 184 pt_ta_delete(td_thragent_t *ta)
 185 {
 186         int dbg;
 187
 188         TDBG_FUNC();
 189
 190         dbg = 0;
 191         /*
 192          * Error returns from this write are not really a problem;
 193          * the process doesn't exist any more.
 194          */
 195         ps_pwrite(ta->ph, ta->libthr_debug_addr, &dbg, sizeof(int));
 196         free(ta);
 197         return (TD_OK);
 198 }
 199
 200 static td_err_e
 201 pt_ta_map_id2thr(const td_thragent_t *ta, thread_t id, td_thrhandle_t *th)
 202 {
 203         prgregset_t gregs;
 204         TAILQ_HEAD(, pthread) thread_list;
 205         psaddr_t pt;
 206         long lwp;
 207         int ret;
 208
 209         TDBG_FUNC();
 210
 211         if (id == 0)
 212                 return (TD_NOTHR);
 213         ret = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
 214                 sizeof(thread_list));
 215         if (ret != 0)
 216                 return (P2T(ret));
 217         /* Iterate through thread list to find pthread */
 218         pt = (psaddr_t)thread_list.tqh_first;
 219         while (pt != NULL) {
 220                 ret = ps_pread(ta->ph, pt + ta->thread_off_tid,
 221                                &lwp, sizeof(lwp));
 222                 if (ret != 0)
 223                         return (P2T(ret));
 224                 if (lwp == id)
 225                         break;
 226                 /* get next thread */
 227                 ret = ps_pread(ta->ph,
 228                                 pt + ta->thread_off_next,
 229                                 &pt, sizeof(pt));
 230                 if (ret != 0)
 231                         return (P2T(ret));
 232         }
 233         if (pt == NULL)
 234                 return (TD_NOTHR);
 235         th->th_ta = ta;
 236         th->th_tid = id;
 237         th->th_thread = pt;
 238         return (TD_OK);
 239 }
 240
 241 static td_err_e
 242 pt_ta_map_lwp2thr(const td_thragent_t *ta, lwpid_t lwp, td_thrhandle_t *th)
 243 {
 244         return (pt_ta_map_id2thr(ta, lwp, th));
 245 }
 246
 247 static td_err_e
 248 pt_ta_thr_iter(const td_thragent_t *ta,
 249                td_thr_iter_f *callback, void *cbdata_p,
 250                td_thr_state_e state, int ti_pri,
 251                sigset_t *ti_sigmask_p,
 252                unsigned int ti_user_flags)
 253 {
 254         TAILQ_HEAD(, pthread) thread_list;
 255         td_thrhandle_t th;
 256         psaddr_t pt;
 257         long lwp;
 258         int ret;
 259
 260         TDBG_FUNC();
 261
 262         ret = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
 263                        sizeof(thread_list));
 264         if (ret != 0)
 265                 return (P2T(ret));
 266         pt = (psaddr_t)thread_list.tqh_first;
 267         while (pt != 0) {
 268                 ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp,
 269                               sizeof(lwp));
 270                 if (ret != 0)
 271                         return (P2T(ret));
 272                 if (lwp != 0 && lwp != TERMINATED) {
 273                         th.th_ta = ta;
 274                         th.th_tid = (thread_t)lwp;
 275                         th.th_thread = pt;
 276                         if ((*callback)(&th, cbdata_p))
 277                                 return (TD_DBERR);
 278                 }
 279                 /* get next thread */
 280                 ret = ps_pread(ta->ph, pt + ta->thread_off_next, &pt,
 281                                sizeof(pt));
 282                 if (ret != 0)
 283                         return (P2T(ret));
 284         }
 285         return (TD_OK);
 286 }
 287
 288 static td_err_e
 289 pt_ta_tsd_iter(const td_thragent_t *ta, td_key_iter_f *ki, void *arg)
 290 {
 291         char *keytable;
 292         void *destructor;
 293         int i, ret, allocated;
 294
 295         TDBG_FUNC();
 296
 297         keytable = malloc(ta->thread_max_keys * ta->thread_size_key);
 298         if (keytable == NULL)
 299                 return (TD_MALLOC);
 300         ret = ps_pread(ta->ph, (psaddr_t)ta->thread_keytable_addr, keytable,
 301                        ta->thread_max_keys * ta->thread_size_key);
 302         if (ret != 0) {
 303                 free(keytable);
 304                 return (P2T(ret));
 305         }
 306         for (i = 0; i < ta->thread_max_keys; i++) {
 307                 allocated = *(int *)(keytable + i * ta->thread_size_key +
 308                         ta->thread_off_key_allocated);
 309                 destructor = *(void **)(keytable + i * ta->thread_size_key +
 310                         ta->thread_off_key_destructor);
 311                 if (allocated) {
 312                         ret = (ki)(i, destructor, arg);
 313                         if (ret != 0) {
 314                                 free(keytable);
 315                                 return (TD_DBERR);
 316                         }
 317                 }
 318         }
 319         free(keytable);
 320         return (TD_OK);
 321 }
 322
 323 static td_err_e
 324 pt_ta_event_addr(const td_thragent_t *ta, td_event_e event, td_notify_t *ptr)
 325 {
 326
 327         TDBG_FUNC();
 328
 329         switch (event) {
 330         case TD_CREATE:
 331                 ptr->type = NOTIFY_BPT;
 332                 ptr->u.bptaddr = ta->thread_bp_create_addr;
 333                 return (0);
 334         case TD_DEATH:
 335                 ptr->type = NOTIFY_BPT;
 336                 ptr->u.bptaddr = ta->thread_bp_death_addr;
 337                 return (0);
 338         default:
 339                 return (TD_ERR);
 340         }
 341 }
 342
 343 static td_err_e
 344 pt_ta_set_event(const td_thragent_t *ta, td_thr_events_t *events)
 345 {
 346         td_thr_events_t mask;
 347         int ret;
 348
 349         TDBG_FUNC();
 350         ret = ps_pread(ta->ph, ta->thread_event_mask_addr, &mask,
 351                 sizeof(mask));
 352         if (ret != 0)
 353                 return (P2T(ret));
 354         mask |= *events;
 355         ret = ps_pwrite(ta->ph, ta->thread_event_mask_addr, &mask,
 356                 sizeof(mask));
 357         return (P2T(ret));
 358 }
 359
 360 static td_err_e
 361 pt_ta_clear_event(const td_thragent_t *ta, td_thr_events_t *events)
 362 {
 363         td_thr_events_t mask;
 364         int ret;
 365
 366         TDBG_FUNC();
 367         ret = ps_pread(ta->ph, ta->thread_event_mask_addr, &mask,
 368                 sizeof(mask));
 369         if (ret != 0)
 370                 return (P2T(ret));
 371         mask &= ~*events;
 372         ret = ps_pwrite(ta->ph, ta->thread_event_mask_addr, &mask,
 373                 sizeof(mask));
 374         return (P2T(ret));
 375 }
 376
 377 static td_err_e
 378 pt_ta_event_getmsg(const td_thragent_t *ta, td_event_msg_t *msg)
 379 {
 380         static td_thrhandle_t handle;
 381
 382         psaddr_t pt, pt_temp;
 383         td_thr_events_e tmp;
 384         long lwp;
 385         int ret;
 386
 387         TDBG_FUNC();
 388
 389         ret = ps_pread(ta->ph, ta->thread_last_event_addr, &pt, sizeof(pt));
 390         if (ret != 0)
 391                 return (P2T(ret));
 392         if (pt == NULL)
 393                 return (TD_NOMSG);
 394         /*
 395          * Take the event pointer, at the time, libthr only reports event
 396          * once a time, so it is not a link list.
 397          */
 398         pt_temp = NULL;
 399         ps_pwrite(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 400
 401         /* Read event info */
 402         ret = ps_pread(ta->ph, pt + ta->thread_off_event_buf, msg, sizeof(*msg));
 403         if (ret != 0)
 404                 return (P2T(ret));
 405         if (msg->event == 0)
 406                 return (TD_NOMSG);
 407         /* Clear event */
 408         tmp = 0;
 409         ps_pwrite(ta->ph, pt + ta->thread_off_event_buf, &tmp, sizeof(tmp));
 410         /* Convert event */
 411         pt = (psaddr_t)msg->th_p;
 412         ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp, sizeof(lwp));
 413         if (ret != 0)
 414                 return (P2T(ret));
 415         handle.th_ta = ta;
 416         handle.th_tid = lwp;
 417         handle.th_thread = pt;
 418         msg->th_p = &handle;
 419         return (0);
 420 }
 421
 422 static td_err_e
 423 pt_dbsuspend(const td_thrhandle_t *th, int suspend)
 424 {
 425         td_thragent_t *ta = (td_thragent_t *)th->th_ta;
 426         int ret;
 427
 428         TDBG_FUNC();
 429
 430         ret = pt_validate(th);
 431         if (ret)
 432                 return (ret);
 433
 434         if (suspend)
 435                 ret = ps_lstop(ta->ph, th->th_tid);
 436         else
 437                 ret = ps_lcontinue(ta->ph, th->th_tid);
 438         return (P2T(ret));
 439 }
 440
 441 static td_err_e
 442 pt_thr_dbresume(const td_thrhandle_t *th)
 443 {
 444         TDBG_FUNC();
 445
 446         return pt_dbsuspend(th, 0);
 447 }
 448
 449 static td_err_e
 450 pt_thr_dbsuspend(const td_thrhandle_t *th)
 451 {
 452         TDBG_FUNC();
 453
 454         return pt_dbsuspend(th, 1);
 455 }
 456
 457 static td_err_e
 458 pt_thr_validate(const td_thrhandle_t *th)
 459 {
 460         td_thrhandle_t temp;
 461         int ret;
 462
 463         TDBG_FUNC();
 464
 465         ret = pt_ta_map_id2thr(th->th_ta, th->th_tid, &temp);
 466         return (ret);
 467 }
 468
 469 static td_err_e
 470 pt_thr_get_info(const td_thrhandle_t *th, td_thrinfo_t *info)
 471 {
 472         const td_thragent_t *ta = th->th_ta;
 473         int state;
 474         int ret;
 475
 476         TDBG_FUNC();
 477
 478         ret = pt_validate(th);
 479         if (ret)
 480                 return (ret);
 481         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_state,
 482                        &state, sizeof(state));
 483         if (ret != 0)
 484                 return (P2T(ret));
 485         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_report_events,
 486                 &info->ti_traceme, sizeof(int));
 487         if (ret != 0)
 488                 return (P2T(ret));
 489         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_event_mask,
 490                 &info->ti_events, sizeof(td_thr_events_t));
 491         if (ret != 0)
 492                 return (P2T(ret));
 493         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_tcb,
 494                 &info->ti_tls, sizeof(void *));
 495         info->ti_lid = th->th_tid;
 496         info->ti_tid = th->th_tid;
 497         info->ti_thread = th->th_thread;
 498         info->ti_ta_p = th->th_ta;
 499         if (state == ta->thread_state_running)
 500                 info->ti_state = TD_THR_RUN;
 501         else if (state == ta->thread_state_zoombie)
 502                 info->ti_state = TD_THR_ZOMBIE;
 503         else
 504                 info->ti_state = TD_THR_SLEEP;
 505         info->ti_type = TD_THR_USER;
 506         return (0);
 507 }
 508
 509 static td_err_e
 510 pt_thr_getfpregs(const td_thrhandle_t *th, prfpregset_t *fpregs)
 511 {
 512         const td_thragent_t *ta = th->th_ta;
 513         int ret;
 514
 515         TDBG_FUNC();
 516
 517         ret = pt_validate(th);
 518         if (ret)
 519                 return (ret);
 520
 521         ret = ps_lgetfpregs(ta->ph, th->th_tid, fpregs);
 522         return (P2T(ret));
 523 }
 524
 525 static td_err_e
 526 pt_thr_getgregs(const td_thrhandle_t *th, prgregset_t gregs)
 527 {
 528         const td_thragent_t *ta = th->th_ta;
 529         int ret;
 530
 531         TDBG_FUNC();
 532
 533         ret = pt_validate(th);
 534         if (ret)
 535                 return (ret);
 536
 537         ret = ps_lgetregs(ta->ph, th->th_tid, gregs);
 538         return (P2T(ret));
 539 }
 540
 541 static td_err_e
 542 pt_thr_setfpregs(const td_thrhandle_t *th, const prfpregset_t *fpregs)
 543 {
 544         const td_thragent_t *ta = th->th_ta;
 545         int ret;
 546
 547         TDBG_FUNC();
 548
 549         ret = pt_validate(th);
 550         if (ret)
 551                 return (ret);
 552
 553         ret = ps_lsetfpregs(ta->ph, th->th_tid, fpregs);
 554         return (P2T(ret));
 555 }
 556
 557 static td_err_e
 558 pt_thr_setgregs(const td_thrhandle_t *th, const prgregset_t gregs)
 559 {
 560         const td_thragent_t *ta = th->th_ta;
 561         int ret;
 562
 563         TDBG_FUNC();
 564
 565         ret = pt_validate(th);
 566         if (ret)
 567                 return (ret);
 568
 569         ret = ps_lsetregs(ta->ph, th->th_tid, gregs);
 570         return (P2T(ret));
 571 }
 572
 573 static td_err_e
 574 pt_thr_event_enable(const td_thrhandle_t *th, int en)
 575 {
 576         const td_thragent_t *ta = th->th_ta;
 577         int ret;
 578
 579         TDBG_FUNC();
 580         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_report_events,
 581                 &en, sizeof(int));
 582         return (P2T(ret));
 583 }
 584
 585 static td_err_e
 586 pt_thr_set_event(const td_thrhandle_t *th, td_thr_events_t *setp)
 587 {
 588         const td_thragent_t *ta = th->th_ta;
 589         td_thr_events_t mask;
 590         int ret;
 591
 592         TDBG_FUNC();
 593         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_event_mask,
 594                         &mask, sizeof(mask));
 595         mask |= *setp;
 596         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_event_mask,
 597                         &mask, sizeof(mask));
 598         return (P2T(ret));
 599 }
 600
 601 static td_err_e
 602 pt_thr_clear_event(const td_thrhandle_t *th, td_thr_events_t *setp)
 603 {
 604         const td_thragent_t *ta = th->th_ta;
 605         td_thr_events_t mask;
 606         int ret;
 607
 608         TDBG_FUNC();
 609         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_event_mask,
 610                         &mask, sizeof(mask));
 611         mask &= ~*setp;
 612         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_event_mask,
 613                         &mask, sizeof(mask));
 614         return (P2T(ret));
 615 }
 616
 617 static td_err_e
 618 pt_thr_event_getmsg(const td_thrhandle_t *th, td_event_msg_t *msg)
 619 {
 620         static td_thrhandle_t handle;
 621         td_thragent_t *ta = (td_thragent_t *)th->th_ta;
 622         psaddr_t pt, pt_temp;
 623         long lwp;
 624         int ret;
 625         td_thr_events_e tmp;
 626
 627         TDBG_FUNC();
 628         pt = th->th_thread;
 629         ret = ps_pread(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 630         if (ret != 0)
 631                 return (P2T(ret));
 632         /* Get event */
 633         ret = ps_pread(ta->ph, pt + ta->thread_off_event_buf, msg, sizeof(*msg));
 634         if (ret != 0)
 635                 return (P2T(ret));
 636         if (msg->event == 0)
 637                 return (TD_NOMSG);
 638         /*
 639          * Take the event pointer, at the time, libthr only reports event
 640          * once a time, so it is not a link list.
 641          */
 642         if (pt == pt_temp) {
 643                 pt_temp = NULL;
 644                 ps_pwrite(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 645         }
 646         /* Clear event */
 647         tmp = 0;
 648         ps_pwrite(ta->ph, pt + ta->thread_off_event_buf, &tmp, sizeof(tmp));
 649         /* Convert event */
 650         pt = (psaddr_t)msg->th_p;
 651         ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp, sizeof(lwp));
 652         if (ret != 0)
 653                 return (P2T(ret));
 654         handle.th_ta = ta;
 655         handle.th_tid = lwp;
 656         handle.th_thread = pt;
 657         msg->th_p = &handle;
 658         return (0);
 659 }
 660
 661 static td_err_e
 662 pt_thr_sstep(const td_thrhandle_t *th, int step)
 663 {
 664         TDBG_FUNC();
 665
 666         return pt_validate(th);
 667 }
 668
 669 static int
 670 pt_validate(const td_thrhandle_t *th)
 671 {
 672
 673         if (th->th_tid == 0 || th->th_thread == NULL)
 674                 return (TD_ERR);
 675         return (TD_OK);
 676 }
 677
 678 static td_err_e
 679 pt_thr_tls_get_addr(const td_thrhandle_t *th, void *_linkmap, size_t offset,
 680                     void **address)
 681 {
 682         char *obj_entry;
 683         const td_thragent_t *ta = th->th_ta;
 684         psaddr_t tcb_addr, *dtv_addr, tcb_tp;
 685         int tls_index, ret;
 686
 687         /* linkmap is a member of Obj_Entry */
 688         obj_entry = (char *)_linkmap - ta->thread_off_linkmap;
 689
 690         /* get tlsindex of the object file */
 691         ret = ps_pread(ta->ph,
 692                 obj_entry + ta->thread_off_tlsindex,
 693                 &tls_index, sizeof(tls_index));
 694         if (ret != 0)
 695                 return (P2T(ret));
 696
 697         /* get thread tcb */
 698         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_tcb,
 699                 &tcb_addr, sizeof(tcb_addr));
 700         if (ret != 0)
 701                 return (P2T(ret));
 702
 703         /* get dtv array address */
 704         ret = ps_pread(ta->ph, tcb_addr + ta->thread_off_dtv,
 705                 &dtv_addr, sizeof(dtv_addr));
 706         if (ret != 0)
 707                 return (P2T(ret));
 708         /* now get the object's tls block base address */
 709         ret = ps_pread(ta->ph, &dtv_addr[tls_index+1], address,
 710                 sizeof(*address));
 711         if (ret != 0)
 712                 return (P2T(ret));
 713
 714         *address += offset;
 715         return (TD_OK);
 716 }
 717
 718 struct ta_ops libthr_db_ops = {
 719         .to_init                = pt_init,
 720         .to_ta_clear_event      = pt_ta_clear_event,
 721         .to_ta_delete           = pt_ta_delete,
 722         .to_ta_event_addr       = pt_ta_event_addr,
 723         .to_ta_event_getmsg     = pt_ta_event_getmsg,
 724         .to_ta_map_id2thr       = pt_ta_map_id2thr,
 725         .to_ta_map_lwp2thr      = pt_ta_map_lwp2thr,
 726         .to_ta_new              = pt_ta_new,
 727         .to_ta_set_event        = pt_ta_set_event,
 728         .to_ta_thr_iter         = pt_ta_thr_iter,
 729         .to_ta_tsd_iter         = pt_ta_tsd_iter,
 730         .to_thr_clear_event     = pt_thr_clear_event,
 731         .to_thr_dbresume        = pt_thr_dbresume,
 732         .to_thr_dbsuspend       = pt_thr_dbsuspend,
 733         .to_thr_event_enable    = pt_thr_event_enable,
 734         .to_thr_event_getmsg    = pt_thr_event_getmsg,
 735         .to_thr_get_info        = pt_thr_get_info,
 736         .to_thr_getfpregs       = pt_thr_getfpregs,
 737         .to_thr_getgregs        = pt_thr_getgregs,
 738         .to_thr_set_event       = pt_thr_set_event,
 739         .to_thr_setfpregs       = pt_thr_setfpregs,
 740         .to_thr_setgregs        = pt_thr_setgregs,
 741         .to_thr_validate        = pt_thr_validate,
 742         .to_thr_tls_get_addr    = pt_thr_tls_get_addr,
 743
 744         /* FreeBSD specific extensions. */
 745         .to_thr_sstep           = pt_thr_sstep,
 746 };