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/linker_set.h>
  37 #include <sys/ptrace.h>
  38 #include <thread_db.h>
  39 #include <unistd.h>
  40
  41 #include "thread_db_int.h"
  42
  43 #define TERMINATED      1
  44
  45 struct td_thragent {
  46         TD_THRAGENT_FIELDS;
  47         psaddr_t        libthr_debug_addr;
  48         psaddr_t        thread_list_addr;
  49         psaddr_t        thread_active_threads_addr;
  50         psaddr_t        thread_keytable_addr;
  51         psaddr_t        thread_last_event_addr;
  52         psaddr_t        thread_event_mask_addr;
  53         psaddr_t        thread_bp_create_addr;
  54         psaddr_t        thread_bp_death_addr;
  55         int             thread_off_dtv;
  56         int             thread_off_tlsindex;
  57         int             thread_off_attr_flags;
  58         int             thread_size_key;
  59         int             thread_off_tcb;
  60         int             thread_off_linkmap;
  61         int             thread_off_next;
  62         int             thread_off_state;
  63         int             thread_off_tid;
  64         int             thread_max_keys;
  65         int             thread_off_key_allocated;
  66         int             thread_off_key_destructor;
  67         int             thread_off_report_events;
  68         int             thread_off_event_mask;
  69         int             thread_off_event_buf;
  70         int             thread_state_zoombie;
  71         int             thread_state_running;
  72 };
  73
  74 #define P2T(c) ps2td(c)
  75
  76 static int pt_validate(const td_thrhandle_t *th);
  77
  78 static int
  79 ps2td(int c)
  80 {
  81         switch (c) {
  82         case PS_OK:
  83                 return TD_OK;
  84         case PS_ERR:
  85                 return TD_ERR;
  86         case PS_BADPID:
  87                 return TD_BADPH;
  88         case PS_BADLID:
  89                 return TD_NOLWP;
  90         case PS_BADADDR:
  91                 return TD_ERR;
  92         case PS_NOSYM:
  93                 return TD_NOLIBTHREAD;
  94         case PS_NOFREGS:
  95                 return TD_NOFPREGS;
  96         default:
  97                 return TD_ERR;
  98         }
  99 }
 100
 101 static td_err_e
 102 pt_init(void)
 103 {
 104         return (0);
 105 }
 106
 107 static td_err_e
 108 pt_ta_new(struct ps_prochandle *ph, td_thragent_t **pta)
 109 {
 110 #define LOOKUP_SYM(proc, sym, addr)                     \
 111         ret = ps_pglobal_lookup(proc, NULL, sym, addr); \
 112         if (ret != 0) {                                 \
 113                 TDBG("can not find symbol: %s\n", sym); \
 114                 ret = TD_NOLIBTHREAD;                   \
 115                 goto error;                             \
 116         }
 117
 118 #define LOOKUP_VAL(proc, sym, val)                      \
 119         ret = ps_pglobal_lookup(proc, NULL, sym, &vaddr);\
 120         if (ret != 0) {                                 \
 121                 TDBG("can not find symbol: %s\n", sym); \
 122                 ret = TD_NOLIBTHREAD;                   \
 123                 goto error;                             \
 124         }                                               \
 125         ret = ps_pread(proc, vaddr, val, sizeof(int));  \
 126         if (ret != 0) {                                 \
 127                 TDBG("can not read value of %s\n", sym);\
 128                 ret = TD_NOLIBTHREAD;                   \
 129                 goto error;                             \
 130         }
 131
 132         td_thragent_t *ta;
 133         psaddr_t vaddr;
 134         int dbg;
 135         int ret;
 136
 137         TDBG_FUNC();
 138
 139         ta = malloc(sizeof(td_thragent_t));
 140         if (ta == NULL)
 141                 return (TD_MALLOC);
 142
 143         ta->ph = ph;
 144
 145         LOOKUP_SYM(ph, "_libthr_debug",         &ta->libthr_debug_addr);
 146         LOOKUP_SYM(ph, "_thread_list",          &ta->thread_list_addr);
 147         LOOKUP_SYM(ph, "_thread_active_threads",&ta->thread_active_threads_addr);
 148         LOOKUP_SYM(ph, "_thread_keytable",      &ta->thread_keytable_addr);
 149         LOOKUP_SYM(ph, "_thread_last_event",    &ta->thread_last_event_addr);
 150         LOOKUP_SYM(ph, "_thread_event_mask",    &ta->thread_event_mask_addr);
 151         LOOKUP_SYM(ph, "_thread_bp_create",     &ta->thread_bp_create_addr);
 152         LOOKUP_SYM(ph, "_thread_bp_death",      &ta->thread_bp_death_addr);
 153         LOOKUP_VAL(ph, "_thread_off_dtv",       &ta->thread_off_dtv);
 154         LOOKUP_VAL(ph, "_thread_off_tlsindex",  &ta->thread_off_tlsindex);
 155         LOOKUP_VAL(ph, "_thread_off_attr_flags",        &ta->thread_off_attr_flags);
 156         LOOKUP_VAL(ph, "_thread_size_key",      &ta->thread_size_key);
 157         LOOKUP_VAL(ph, "_thread_off_tcb",       &ta->thread_off_tcb);
 158         LOOKUP_VAL(ph, "_thread_off_tid",       &ta->thread_off_tid);
 159         LOOKUP_VAL(ph, "_thread_off_linkmap",   &ta->thread_off_linkmap);
 160         LOOKUP_VAL(ph, "_thread_off_next",      &ta->thread_off_next);
 161         LOOKUP_VAL(ph, "_thread_off_state",     &ta->thread_off_state);
 162         LOOKUP_VAL(ph, "_thread_max_keys",      &ta->thread_max_keys);
 163         LOOKUP_VAL(ph, "_thread_off_key_allocated", &ta->thread_off_key_allocated);
 164         LOOKUP_VAL(ph, "_thread_off_key_destructor", &ta->thread_off_key_destructor);
 165         LOOKUP_VAL(ph, "_thread_state_running", &ta->thread_state_running);
 166         LOOKUP_VAL(ph, "_thread_state_zoombie", &ta->thread_state_zoombie);
 167         LOOKUP_VAL(ph, "_thread_off_report_events", &ta->thread_off_report_events);
 168         LOOKUP_VAL(ph, "_thread_off_event_mask", &ta->thread_off_event_mask);
 169         LOOKUP_VAL(ph, "_thread_off_event_buf", &ta->thread_off_event_buf);
 170         dbg = getpid();
 171         /*
 172          * If this fails it probably means we're debugging a core file and
 173          * can't write to it.
 174          */
 175         ps_pwrite(ph, ta->libthr_debug_addr, &dbg, sizeof(int));
 176         *pta = ta;
 177         return (0);
 178
 179 error:
 180         free(ta);
 181         return (ret);
 182 }
 183
 184 static td_err_e
 185 pt_ta_delete(td_thragent_t *ta)
 186 {
 187         int dbg;
 188
 189         TDBG_FUNC();
 190
 191         dbg = 0;
 192         /*
 193          * Error returns from this write are not really a problem;
 194          * the process doesn't exist any more.
 195          */
 196         ps_pwrite(ta->ph, ta->libthr_debug_addr, &dbg, sizeof(int));
 197         free(ta);
 198         return (TD_OK);
 199 }
 200
 201 static td_err_e
 202 pt_ta_map_id2thr(const td_thragent_t *ta, thread_t id, td_thrhandle_t *th)
 203 {
 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 != 0) {
 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 == 0)
 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, td_thr_iter_f *callback,
 249     void *cbdata_p, td_thr_state_e state __unused, int ti_pri __unused,
 250     sigset_t *ti_sigmask_p __unused, unsigned int ti_user_flags __unused)
 251 {
 252         TAILQ_HEAD(, pthread) thread_list;
 253         td_thrhandle_t th;
 254         psaddr_t pt;
 255         long lwp;
 256         int ret;
 257
 258         TDBG_FUNC();
 259
 260         ret = ps_pread(ta->ph, ta->thread_list_addr, &thread_list,
 261                        sizeof(thread_list));
 262         if (ret != 0)
 263                 return (P2T(ret));
 264         pt = (psaddr_t)thread_list.tqh_first;
 265         while (pt != 0) {
 266                 ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp,
 267                               sizeof(lwp));
 268                 if (ret != 0)
 269                         return (P2T(ret));
 270                 if (lwp != 0 && lwp != TERMINATED) {
 271                         th.th_ta = ta;
 272                         th.th_tid = (thread_t)lwp;
 273                         th.th_thread = pt;
 274                         if ((*callback)(&th, cbdata_p))
 275                                 return (TD_DBERR);
 276                 }
 277                 /* get next thread */
 278                 ret = ps_pread(ta->ph, pt + ta->thread_off_next, &pt,
 279                                sizeof(pt));
 280                 if (ret != 0)
 281                         return (P2T(ret));
 282         }
 283         return (TD_OK);
 284 }
 285
 286 static td_err_e
 287 pt_ta_tsd_iter(const td_thragent_t *ta, td_key_iter_f *ki, void *arg)
 288 {
 289         void *keytable;
 290         void *destructor;
 291         int i, ret, allocated;
 292
 293         TDBG_FUNC();
 294
 295         keytable = malloc(ta->thread_max_keys * ta->thread_size_key);
 296         if (keytable == NULL)
 297                 return (TD_MALLOC);
 298         ret = ps_pread(ta->ph, (psaddr_t)ta->thread_keytable_addr, keytable,
 299                        ta->thread_max_keys * ta->thread_size_key);
 300         if (ret != 0) {
 301                 free(keytable);
 302                 return (P2T(ret));
 303         }
 304         for (i = 0; i < ta->thread_max_keys; i++) {
 305                 allocated = *(int *)(void *)((uintptr_t)keytable +
 306                     i * ta->thread_size_key + ta->thread_off_key_allocated);
 307                 destructor = *(void **)(void *)((uintptr_t)keytable +
 308                     i * ta->thread_size_key + ta->thread_off_key_destructor);
 309                 if (allocated) {
 310                         ret = (ki)(i, destructor, arg);
 311                         if (ret != 0) {
 312                                 free(keytable);
 313                                 return (TD_DBERR);
 314                         }
 315                 }
 316         }
 317         free(keytable);
 318         return (TD_OK);
 319 }
 320
 321 static td_err_e
 322 pt_ta_event_addr(const td_thragent_t *ta, td_event_e event, td_notify_t *ptr)
 323 {
 324
 325         TDBG_FUNC();
 326
 327         switch (event) {
 328         case TD_CREATE:
 329                 ptr->type = NOTIFY_BPT;
 330                 ptr->u.bptaddr = ta->thread_bp_create_addr;
 331                 return (0);
 332         case TD_DEATH:
 333                 ptr->type = NOTIFY_BPT;
 334                 ptr->u.bptaddr = ta->thread_bp_death_addr;
 335                 return (0);
 336         default:
 337                 return (TD_ERR);
 338         }
 339 }
 340
 341 static td_err_e
 342 pt_ta_set_event(const td_thragent_t *ta, td_thr_events_t *events)
 343 {
 344         td_thr_events_t mask;
 345         int ret;
 346
 347         TDBG_FUNC();
 348         ret = ps_pread(ta->ph, ta->thread_event_mask_addr, &mask,
 349                 sizeof(mask));
 350         if (ret != 0)
 351                 return (P2T(ret));
 352         mask |= *events;
 353         ret = ps_pwrite(ta->ph, ta->thread_event_mask_addr, &mask,
 354                 sizeof(mask));
 355         return (P2T(ret));
 356 }
 357
 358 static td_err_e
 359 pt_ta_clear_event(const td_thragent_t *ta, td_thr_events_t *events)
 360 {
 361         td_thr_events_t mask;
 362         int ret;
 363
 364         TDBG_FUNC();
 365         ret = ps_pread(ta->ph, ta->thread_event_mask_addr, &mask,
 366                 sizeof(mask));
 367         if (ret != 0)
 368                 return (P2T(ret));
 369         mask &= ~*events;
 370         ret = ps_pwrite(ta->ph, ta->thread_event_mask_addr, &mask,
 371                 sizeof(mask));
 372         return (P2T(ret));
 373 }
 374
 375 static td_err_e
 376 pt_ta_event_getmsg(const td_thragent_t *ta, td_event_msg_t *msg)
 377 {
 378         static td_thrhandle_t handle;
 379
 380         psaddr_t pt, pt_temp;
 381         td_thr_events_e tmp;
 382         long lwp;
 383         int ret;
 384
 385         TDBG_FUNC();
 386
 387         ret = ps_pread(ta->ph, ta->thread_last_event_addr, &pt, sizeof(pt));
 388         if (ret != 0)
 389                 return (P2T(ret));
 390         if (pt == 0)
 391                 return (TD_NOMSG);
 392         /*
 393          * Take the event pointer, at the time, libthr only reports event
 394          * once a time, so it is not a link list.
 395          */
 396         pt_temp = 0;
 397         ps_pwrite(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 398
 399         /* Read event info */
 400         ret = ps_pread(ta->ph, pt + ta->thread_off_event_buf, msg, sizeof(*msg));
 401         if (ret != 0)
 402                 return (P2T(ret));
 403         if (msg->event == 0)
 404                 return (TD_NOMSG);
 405         /* Clear event */
 406         tmp = 0;
 407         ps_pwrite(ta->ph, pt + ta->thread_off_event_buf, &tmp, sizeof(tmp));
 408         /* Convert event */
 409         pt = (psaddr_t)msg->th_p;
 410         ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp, sizeof(lwp));
 411         if (ret != 0)
 412                 return (P2T(ret));
 413         handle.th_ta = ta;
 414         handle.th_tid = lwp;
 415         handle.th_thread = pt;
 416         msg->th_p = &handle;
 417         return (0);
 418 }
 419
 420 static td_err_e
 421 pt_dbsuspend(const td_thrhandle_t *th, int suspend)
 422 {
 423         const td_thragent_t *ta = th->th_ta;
 424         int ret;
 425
 426         TDBG_FUNC();
 427
 428         ret = pt_validate(th);
 429         if (ret)
 430                 return (ret);
 431
 432         if (suspend)
 433                 ret = ps_lstop(ta->ph, th->th_tid);
 434         else
 435                 ret = ps_lcontinue(ta->ph, th->th_tid);
 436         return (P2T(ret));
 437 }
 438
 439 static td_err_e
 440 pt_thr_dbresume(const td_thrhandle_t *th)
 441 {
 442         TDBG_FUNC();
 443
 444         return pt_dbsuspend(th, 0);
 445 }
 446
 447 static td_err_e
 448 pt_thr_dbsuspend(const td_thrhandle_t *th)
 449 {
 450         TDBG_FUNC();
 451
 452         return pt_dbsuspend(th, 1);
 453 }
 454
 455 static td_err_e
 456 pt_thr_validate(const td_thrhandle_t *th)
 457 {
 458         td_thrhandle_t temp;
 459         int ret;
 460
 461         TDBG_FUNC();
 462
 463         ret = pt_ta_map_id2thr(th->th_ta, th->th_tid, &temp);
 464         return (ret);
 465 }
 466
 467 static td_err_e
 468 pt_thr_get_info(const td_thrhandle_t *th, td_thrinfo_t *info)
 469 {
 470         const td_thragent_t *ta = th->th_ta;
 471         struct ptrace_lwpinfo linfo;
 472         int state;
 473         int ret;
 474
 475         TDBG_FUNC();
 476
 477         bzero(info, sizeof(*info));
 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         ret = ps_linfo(ta->ph, th->th_tid, &linfo);
 500         if (ret == PS_OK) {
 501                 info->ti_sigmask = linfo.pl_sigmask;
 502                 info->ti_pending = linfo.pl_siglist;
 503         } else
 504                 return (ret);
 505         if (state == ta->thread_state_running)
 506                 info->ti_state = TD_THR_RUN;
 507         else if (state == ta->thread_state_zoombie)
 508                 info->ti_state = TD_THR_ZOMBIE;
 509         else
 510                 info->ti_state = TD_THR_SLEEP;
 511         info->ti_type = TD_THR_USER;
 512         return (0);
 513 }
 514
 515 #ifdef __i386__
 516 static td_err_e
 517 pt_thr_getxmmregs(const td_thrhandle_t *th, char *fxsave)
 518 {
 519         const td_thragent_t *ta = th->th_ta;
 520         int ret;
 521
 522         TDBG_FUNC();
 523
 524         ret = pt_validate(th);
 525         if (ret)
 526                 return (ret);
 527
 528         ret = ps_lgetxmmregs(ta->ph, th->th_tid, fxsave);
 529         return (P2T(ret));
 530 }
 531 #endif
 532
 533 static td_err_e
 534 pt_thr_getfpregs(const td_thrhandle_t *th, prfpregset_t *fpregs)
 535 {
 536         const td_thragent_t *ta = th->th_ta;
 537         int ret;
 538
 539         TDBG_FUNC();
 540
 541         ret = pt_validate(th);
 542         if (ret)
 543                 return (ret);
 544
 545         ret = ps_lgetfpregs(ta->ph, th->th_tid, fpregs);
 546         return (P2T(ret));
 547 }
 548
 549 static td_err_e
 550 pt_thr_getgregs(const td_thrhandle_t *th, prgregset_t gregs)
 551 {
 552         const td_thragent_t *ta = th->th_ta;
 553         int ret;
 554
 555         TDBG_FUNC();
 556
 557         ret = pt_validate(th);
 558         if (ret)
 559                 return (ret);
 560
 561         ret = ps_lgetregs(ta->ph, th->th_tid, gregs);
 562         return (P2T(ret));
 563 }
 564
 565 #ifdef __i386__
 566 static td_err_e
 567 pt_thr_setxmmregs(const td_thrhandle_t *th, const char *fxsave)
 568 {
 569         const td_thragent_t *ta = th->th_ta;
 570         int ret;
 571
 572         TDBG_FUNC();
 573
 574         ret = pt_validate(th);
 575         if (ret)
 576                 return (ret);
 577
 578         ret = ps_lsetxmmregs(ta->ph, th->th_tid, fxsave);
 579         return (P2T(ret));
 580 }
 581 #endif
 582
 583 static td_err_e
 584 pt_thr_setfpregs(const td_thrhandle_t *th, const prfpregset_t *fpregs)
 585 {
 586         const td_thragent_t *ta = th->th_ta;
 587         int ret;
 588
 589         TDBG_FUNC();
 590
 591         ret = pt_validate(th);
 592         if (ret)
 593                 return (ret);
 594
 595         ret = ps_lsetfpregs(ta->ph, th->th_tid, fpregs);
 596         return (P2T(ret));
 597 }
 598
 599 static td_err_e
 600 pt_thr_setgregs(const td_thrhandle_t *th, const prgregset_t gregs)
 601 {
 602         const td_thragent_t *ta = th->th_ta;
 603         int ret;
 604
 605         TDBG_FUNC();
 606
 607         ret = pt_validate(th);
 608         if (ret)
 609                 return (ret);
 610
 611         ret = ps_lsetregs(ta->ph, th->th_tid, gregs);
 612         return (P2T(ret));
 613 }
 614
 615 static td_err_e
 616 pt_thr_event_enable(const td_thrhandle_t *th, int en)
 617 {
 618         const td_thragent_t *ta = th->th_ta;
 619         int ret;
 620
 621         TDBG_FUNC();
 622         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_report_events,
 623                 &en, sizeof(int));
 624         return (P2T(ret));
 625 }
 626
 627 static td_err_e
 628 pt_thr_set_event(const td_thrhandle_t *th, td_thr_events_t *setp)
 629 {
 630         const td_thragent_t *ta = th->th_ta;
 631         td_thr_events_t mask;
 632         int ret;
 633
 634         TDBG_FUNC();
 635         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_event_mask,
 636                         &mask, sizeof(mask));
 637         mask |= *setp;
 638         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_event_mask,
 639                         &mask, sizeof(mask));
 640         return (P2T(ret));
 641 }
 642
 643 static td_err_e
 644 pt_thr_clear_event(const td_thrhandle_t *th, td_thr_events_t *setp)
 645 {
 646         const td_thragent_t *ta = th->th_ta;
 647         td_thr_events_t mask;
 648         int ret;
 649
 650         TDBG_FUNC();
 651         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_event_mask,
 652                         &mask, sizeof(mask));
 653         mask &= ~*setp;
 654         ret = ps_pwrite(ta->ph, th->th_thread + ta->thread_off_event_mask,
 655                         &mask, sizeof(mask));
 656         return (P2T(ret));
 657 }
 658
 659 static td_err_e
 660 pt_thr_event_getmsg(const td_thrhandle_t *th, td_event_msg_t *msg)
 661 {
 662         static td_thrhandle_t handle;
 663         const td_thragent_t *ta = th->th_ta;
 664         psaddr_t pt, pt_temp;
 665         long lwp;
 666         int ret;
 667         td_thr_events_e tmp;
 668
 669         TDBG_FUNC();
 670         pt = th->th_thread;
 671         ret = ps_pread(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 672         if (ret != 0)
 673                 return (P2T(ret));
 674         /* Get event */
 675         ret = ps_pread(ta->ph, pt + ta->thread_off_event_buf, msg, sizeof(*msg));
 676         if (ret != 0)
 677                 return (P2T(ret));
 678         if (msg->event == 0)
 679                 return (TD_NOMSG);
 680         /*
 681          * Take the event pointer, at the time, libthr only reports event
 682          * once a time, so it is not a link list.
 683          */
 684         if (pt == pt_temp) {
 685                 pt_temp = 0;
 686                 ps_pwrite(ta->ph, ta->thread_last_event_addr, &pt_temp, sizeof(pt_temp));
 687         }
 688         /* Clear event */
 689         tmp = 0;
 690         ps_pwrite(ta->ph, pt + ta->thread_off_event_buf, &tmp, sizeof(tmp));
 691         /* Convert event */
 692         pt = (psaddr_t)msg->th_p;
 693         ret = ps_pread(ta->ph, pt + ta->thread_off_tid, &lwp, sizeof(lwp));
 694         if (ret != 0)
 695                 return (P2T(ret));
 696         handle.th_ta = ta;
 697         handle.th_tid = lwp;
 698         handle.th_thread = pt;
 699         msg->th_p = &handle;
 700         return (0);
 701 }
 702
 703 static td_err_e
 704 pt_thr_sstep(const td_thrhandle_t *th, int step __unused)
 705 {
 706         TDBG_FUNC();
 707
 708         return pt_validate(th);
 709 }
 710
 711 static int
 712 pt_validate(const td_thrhandle_t *th)
 713 {
 714
 715         if (th->th_tid == 0 || th->th_thread == 0)
 716                 return (TD_ERR);
 717         return (TD_OK);
 718 }
 719
 720 static td_err_e
 721 pt_thr_tls_get_addr(const td_thrhandle_t *th, psaddr_t _linkmap, size_t offset,
 722     psaddr_t *address)
 723 {
 724         const td_thragent_t *ta = th->th_ta;
 725         psaddr_t dtv_addr, obj_entry, tcb_addr;
 726         int tls_index, ret;
 727
 728         /* linkmap is a member of Obj_Entry */
 729         obj_entry = _linkmap - ta->thread_off_linkmap;
 730
 731         /* get tlsindex of the object file */
 732         ret = ps_pread(ta->ph,
 733                 obj_entry + ta->thread_off_tlsindex,
 734                 &tls_index, sizeof(tls_index));
 735         if (ret != 0)
 736                 return (P2T(ret));
 737
 738         /* get thread tcb */
 739         ret = ps_pread(ta->ph, th->th_thread + ta->thread_off_tcb,
 740                 &tcb_addr, sizeof(tcb_addr));
 741         if (ret != 0)
 742                 return (P2T(ret));
 743
 744         /* get dtv array address */
 745         ret = ps_pread(ta->ph, tcb_addr + ta->thread_off_dtv,
 746                 &dtv_addr, sizeof(dtv_addr));
 747         if (ret != 0)
 748                 return (P2T(ret));
 749         /* now get the object's tls block base address */
 750         ret = ps_pread(ta->ph, dtv_addr + sizeof(void *) * (tls_index+1),
 751             address, sizeof(*address));
 752         if (ret != 0)
 753                 return (P2T(ret));
 754
 755         *address += offset;
 756         return (TD_OK);
 757 }
 758
 759 struct ta_ops libthr_db_ops = {
 760         .to_init                = pt_init,
 761         .to_ta_clear_event      = pt_ta_clear_event,
 762         .to_ta_delete           = pt_ta_delete,
 763         .to_ta_event_addr       = pt_ta_event_addr,
 764         .to_ta_event_getmsg     = pt_ta_event_getmsg,
 765         .to_ta_map_id2thr       = pt_ta_map_id2thr,
 766         .to_ta_map_lwp2thr      = pt_ta_map_lwp2thr,
 767         .to_ta_new              = pt_ta_new,
 768         .to_ta_set_event        = pt_ta_set_event,
 769         .to_ta_thr_iter         = pt_ta_thr_iter,
 770         .to_ta_tsd_iter         = pt_ta_tsd_iter,
 771         .to_thr_clear_event     = pt_thr_clear_event,
 772         .to_thr_dbresume        = pt_thr_dbresume,
 773         .to_thr_dbsuspend       = pt_thr_dbsuspend,
 774         .to_thr_event_enable    = pt_thr_event_enable,
 775         .to_thr_event_getmsg    = pt_thr_event_getmsg,
 776         .to_thr_get_info        = pt_thr_get_info,
 777         .to_thr_getfpregs       = pt_thr_getfpregs,
 778         .to_thr_getgregs        = pt_thr_getgregs,
 779         .to_thr_set_event       = pt_thr_set_event,
 780         .to_thr_setfpregs       = pt_thr_setfpregs,
 781         .to_thr_setgregs        = pt_thr_setgregs,
 782         .to_thr_validate        = pt_thr_validate,
 783         .to_thr_tls_get_addr    = pt_thr_tls_get_addr,
 784
 785         /* FreeBSD specific extensions. */
 786         .to_thr_sstep           = pt_thr_sstep,
 787 #ifdef __i386__
 788         .to_thr_getxmmregs      = pt_thr_getxmmregs,
 789         .to_thr_setxmmregs      = pt_thr_setxmmregs,
 790 #endif
 791 };
 792
 793 DATA_SET(__ta_ops, libthr_db_ops);