nptl_db/td_thr_validate.c

   1 /* Validate a thread handle.
   2    Copyright (C) 1999-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include "thread_dbP.h"
  21 #include <stdbool.h>
  22
  23 td_err_e
  24 __td_ta_stack_user (td_thragent_t *ta, psaddr_t *plist)
  25 {
  26   if (__td_ta_rtld_global (ta))
  27     return DB_GET_FIELD_ADDRESS (*plist, ta, ta->ta_addr__rtld_global,
  28                                  rtld_global, _dl_stack_user, 0);
  29   else
  30     {
  31       if (ta->ta_addr__dl_stack_user == 0
  32           && td_mod_lookup (ta->ph, NULL, SYM__dl_stack_user,
  33                             &ta->ta_addr__dl_stack_user) != PS_OK)
  34         return TD_ERR;
  35       *plist = ta->ta_addr__dl_stack_user;
  36       return TD_OK;
  37     }
  38 }
  39
  40 td_err_e
  41 __td_ta_stack_used (td_thragent_t *ta, psaddr_t *plist)
  42 {
  43
  44   if (__td_ta_rtld_global (ta))
  45     return DB_GET_FIELD_ADDRESS (*plist, ta, ta->ta_addr__rtld_global,
  46                                  rtld_global, _dl_stack_used, 0);
  47   else
  48     {
  49       if (ta->ta_addr__dl_stack_used == 0
  50           && td_mod_lookup (ta->ph, NULL, SYM__dl_stack_used,
  51                             &ta->ta_addr__dl_stack_used) != PS_OK)
  52         return TD_ERR;
  53       *plist = ta->ta_addr__dl_stack_used;
  54       return TD_OK;
  55     }
  56 }
  57
  58 static td_err_e
  59 check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
  60 {
  61   td_err_e err;
  62   psaddr_t next, ofs;
  63
  64   err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
  65   if (err == TD_OK)
  66     {
  67       if (next == 0)
  68         {
  69           *uninit = true;
  70           return TD_NOTHR;
  71         }
  72       err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
  73     }
  74
  75   while (err == TD_OK)
  76     {
  77       if (next == head)
  78         return TD_NOTHR;
  79
  80       if (next - (ofs - (psaddr_t) 0) == th->th_unique)
  81         return TD_OK;
  82
  83       err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
  84     }
  85
  86   return err;
  87 }
  88
  89
  90 td_err_e
  91 td_thr_validate (const td_thrhandle_t *th)
  92 {
  93   td_err_e err;
  94   psaddr_t list;
  95
  96   LOG ("td_thr_validate");
  97
  98   /* First check the list with threads using user allocated stacks.  */
  99   bool uninit = false;
 100   err = __td_ta_stack_user (th->th_ta_p, &list);
 101   if (err == TD_OK)
 102     err = check_thread_list (th, list, &uninit);
 103
 104   /* If our thread is not on this list search the list with stack
 105      using implementation allocated stacks.  */
 106   if (err == TD_NOTHR)
 107     {
 108       err = __td_ta_stack_used (th->th_ta_p, &list);
 109       if (err == TD_OK)
 110         err = check_thread_list (th, list, &uninit);
 111
 112       if (err == TD_NOTHR && uninit && th->th_unique == 0)
 113         /* __pthread_initialize_minimal has not run yet.
 114            There is only the special case thread handle.  */
 115         err = TD_OK;
 116     }
 117
 118   return err;
 119 }