linuxthreads_db/td_thr_getgregs.c

   1 /* Get a thread's general register set.
   2    Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.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 gregs)
  26 {
  27   struct _pthread_descr_struct pds;
  28
  29   LOG ("td_thr_getgregs");
  30
  31   if (th->th_unique == NULL)
  32     {
  33       /* No data yet.  Use the main thread.  */
  34       pid_t pid = ps_getpid (th->th_ta_p->ph);
  35       if (ps_lgetregs (th->th_ta_p->ph, pid, gregs) != PS_OK)
  36         return TD_ERR;
  37       return TD_OK;
  38     }
  39
  40   /* We have to get the state and the PID for this thread.  */
  41   if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
  42                  sizeof (struct _pthread_descr_struct)) != PS_OK)
  43     return TD_ERR;
  44
  45   /* If the thread already terminated we return all zeroes.  */
  46   if (pds.p_terminated)
  47     memset (gregs, '\0', sizeof (prgregset_t));
  48   /* Otherwise get the register content through the callback.  */
  49   else
  50     {
  51       pid_t pid = pds.p_pid ?: ps_getpid (th->th_ta_p->ph);
  52
  53       if (ps_lgetregs (th->th_ta_p->ph, pid, gregs) != PS_OK)
  54         return TD_ERR;
  55     }
  56
  57   return TD_OK;
  58 }