nptl_db/td_thr_getgregs.c

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