nptl_db/td_thr_getgregs.c

   1 /* Get a thread's general register set.
   2    Copyright (C) 1999-2017 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "thread_dbP.h"
  21
  22
  23 td_err_e
  24 td_thr_getgregs (const td_thrhandle_t *th, prgregset_t regset)
  25 {
  26   psaddr_t cancelhandling, tid;
  27   td_err_e err;
  28
  29   LOG ("td_thr_getgregs");
  30
  31   if (th->th_unique == 0)
  32     /* Special case for the main thread before initialization.  */
  33     return ps_lgetregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
  34                         regset) != PS_OK ? TD_ERR : TD_OK;
  35
  36   /* We have to get the state and the PID for this thread.  */
  37   err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
  38                       cancelhandling, 0);
  39   if (err != TD_OK)
  40     return err;
  41
  42   /* If the thread already terminated we return all zeroes.  */
  43   if (((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK)
  44     memset (regset, '\0', sizeof (*regset));
  45   /* Otherwise get the register content through the callback.  */
  46   else
  47     {
  48       err = DB_GET_FIELD (tid, th->th_ta_p, th->th_unique, pthread, tid, 0);
  49       if (err != TD_OK)
  50         return err;
  51
  52       if (ps_lgetregs (th->th_ta_p->ph, (uintptr_t) tid, regset) != PS_OK)
  53         return TD_ERR;
  54     }
  55
  56   return TD_OK;
  57 }