nptl_db/td_thr_validate.c

   1 /* Validate a thread handle.
   2    Copyright (C) 1999-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include "thread_dbP.h"
  20 #include <stdbool.h>
  21
  22 td_err_e
  23 __td_ta_stack_user (td_thragent_t *ta, psaddr_t *plist)
  24 {
  25   if (__td_ta_rtld_global (ta))
  26     return DB_GET_FIELD_ADDRESS (*plist, ta, ta->ta_addr__rtld_global,
  27                                  rtld_global, _dl_stack_user, 0);
  28   else
  29     {
  30       if (ta->ta_addr__dl_stack_user == 0
  31           && td_mod_lookup (ta->ph, NULL, SYM__dl_stack_user,
  32                             &ta->ta_addr__dl_stack_user) != PS_OK)
  33         return TD_ERR;
  34       *plist = ta->ta_addr__dl_stack_user;
  35       return TD_OK;
  36     }
  37 }
  38
  39 td_err_e
  40 __td_ta_stack_used (td_thragent_t *ta, psaddr_t *plist)
  41 {
  42
  43   if (__td_ta_rtld_global (ta))
  44     return DB_GET_FIELD_ADDRESS (*plist, ta, ta->ta_addr__rtld_global,
  45                                  rtld_global, _dl_stack_used, 0);
  46   else
  47     {
  48       if (ta->ta_addr__dl_stack_used == 0
  49           && td_mod_lookup (ta->ph, NULL, SYM__dl_stack_used,
  50                             &ta->ta_addr__dl_stack_used) != PS_OK)
  51         return TD_ERR;
  52       *plist = ta->ta_addr__dl_stack_used;
  53       return TD_OK;
  54     }
  55 }
  56
  57 static td_err_e
  58 check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
  59 {
  60   td_err_e err;
  61   psaddr_t next, ofs;
  62
  63   err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
  64   if (err == TD_OK)
  65     {
  66       if (next == 0)
  67         {
  68           *uninit = true;
  69           return TD_NOTHR;
  70         }
  71       err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
  72     }
  73
  74   while (err == TD_OK)
  75     {
  76       if (next == head)
  77         return TD_NOTHR;
  78
  79       if (next - (ofs - (psaddr_t) 0) == th->th_unique)
  80         return TD_OK;
  81
  82       err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
  83     }
  84
  85   return err;
  86 }
  87
  88
  89 td_err_e
  90 td_thr_validate (const td_thrhandle_t *th)
  91 {
  92   td_err_e err;
  93   psaddr_t list;
  94
  95   LOG ("td_thr_validate");
  96
  97   /* First check the list with threads using user allocated stacks.  */
  98   bool uninit = false;
  99   err = __td_ta_stack_user (th->th_ta_p, &list);
 100   if (err == TD_OK)
 101     err = check_thread_list (th, list, &uninit);
 102
 103   /* If our thread is not on this list search the list with stack
 104      using implementation allocated stacks.  */
 105   if (err == TD_NOTHR)
 106     {
 107       err = __td_ta_stack_used (th->th_ta_p, &list);
 108       if (err == TD_OK)
 109         err = check_thread_list (th, list, &uninit);
 110
 111       if (err == TD_NOTHR && uninit && th->th_unique == 0)
 112         /* __pthread_initialize_minimal has not run yet.
 113            There is only the special case thread handle.  */
 114         err = TD_OK;
 115     }
 116
 117   return err;
 118 }