libpthread/linuxthreads_db/td_thr_getfpregs.c

   1 /* Get a thread's floating-point register set.
   2    Copyright (C) 1999, 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include "thread_dbP.h"
  21
  22
  23 td_err_e
  24 td_thr_getfpregs (const td_thrhandle_t *th, prfpregset_t *regset)
  25 {
  26   struct _pthread_descr_struct pds;
  27
  28   LOG ("td_thr_getfpregs");
  29
  30   if (th->th_unique == NULL)
  31     {
  32       /* No data yet.  Use the main thread.  */
  33       pid_t pid = ps_getpid (th->th_ta_p->ph);
  34       if (ps_lgetfpregs (th->th_ta_p->ph, pid, regset) != PS_OK)
  35         return TD_ERR;
  36       return TD_OK;
  37     }
  38
  39   /* We have to get the state and the PID for this thread.  */
  40   if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
  41                  sizeof (struct _pthread_descr_struct)) != PS_OK)
  42     return TD_ERR;
  43
  44   /* If the thread already terminated we return all zeroes.  */
  45   if (pds.p_terminated)
  46     memset (regset, '\0', sizeof (*regset));
  47   /* Otherwise get the register content through the callback.  */
  48   else
  49     {
  50       pid_t pid = pds.p_pid ?: ps_getpid (th->th_ta_p->ph);
  51
  52       if (ps_lgetfpregs (th->th_ta_p->ph, pid, regset) != PS_OK)
  53         return TD_ERR;
  54     }
  55
  56   return TD_OK;
  57 }