nptl_db/td_thr_getgregs.c

   1 /* Get a thread's general register set.
   2    Copyright (C) 1999, 2000, 2001, 2002, 2003, 2007 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include "thread_dbP.h"
  22
  23
  24 td_err_e
  25 td_thr_getgregs (const td_thrhandle_t *th, prgregset_t regset)
  26 {
  27   psaddr_t cancelhandling, tid;
  28   td_err_e err;
  29
  30   LOG ("td_thr_getgregs");
  31
  32   if (th->th_unique == 0)
  33     /* Special case for the main thread before initialization.  */
  34     return ps_lgetregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
  35                         regset) != PS_OK ? TD_ERR : TD_OK;
  36
  37   /* We have to get the state and the PID for this thread.  */
  38   err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
  39                       cancelhandling, 0);
  40   if (err != TD_OK)
  41     return err;
  42
  43   /* If the thread already terminated we return all zeroes.  */
  44   if (((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK)
  45     memset (regset, '\0', sizeof (*regset));
  46   /* Otherwise get the register content through the callback.  */
  47   else
  48     {
  49       err = DB_GET_FIELD (tid, th->th_ta_p, th->th_unique, pthread, tid, 0);
  50       if (err != TD_OK)
  51         return err;
  52
  53       if (ps_lgetregs (th->th_ta_p->ph, (uintptr_t) tid, regset) != PS_OK)
  54         return TD_ERR;
  55     }
  56
  57   return TD_OK;
  58 }