Line data    Source code

       1             : /* Get return address register value for frame.
       2             :    Copyright (C) 2013 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include "libdwflP.h"
      34             : 
      35             : bool
      36         484 : dwfl_frame_pc (Dwfl_Frame *state, Dwarf_Addr *pc, bool *isactivation)
      37             : {
      38         484 :   assert (state->pc_state == DWFL_FRAME_STATE_PC_SET);
      39         484 :   *pc = state->pc;
      40         484 :   ebl_normalize_pc (state->thread->process->ebl, pc);
      41         484 :   if (isactivation)
      42             :     {
      43             :       /* Bottom frame?  */
      44         232 :       if (state->initial_frame)
      45          47 :         *isactivation = true;
      46             :       /* *ISACTIVATION is logical union of whether current or previous frame
      47             :          state is SIGNAL_FRAME.  */
      48         185 :       else if (state->signal_frame)
      49           0 :         *isactivation = true;
      50             :       else
      51             :         {
      52             :           /* If the previous frame has unwound unsuccessfully just silently do
      53             :              not consider it could be a SIGNAL_FRAME.  */
      54         185 :           __libdwfl_frame_unwind (state);
      55         185 :           if (state->unwound == NULL
      56         165 :               || state->unwound->pc_state != DWFL_FRAME_STATE_PC_SET)
      57          40 :             *isactivation = false;
      58             :           else
      59         145 :             *isactivation = state->unwound->signal_frame;
      60             :         }
      61             :     }
      62         484 :   return true;
      63             : }
      64             : INTDEF (dwfl_frame_pc)