text: /* err.c --- handle errors for RX simulator.
  
  Copyright (C) 2008-2015 Free Software Foundation, Inc.
  Contributed by Red Hat, Inc.
  
  This file is part of the GNU simulators.
  
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #include "err.h"
  
  static unsigned char ee_actions[SIM_ERR_NUM_ERRORS];
  
  static enum execution_error last_error;
  
  static void
  ee_overrides ()
  {
    /* GCC may initialize a bitfield by reading the uninitialized byte,
       masking in the bitfield, and writing the byte back out.  */
    ee_actions[SIM_ERR_READ_UNWRITTEN_BYTES] = SIM_ERRACTION_IGNORE;
    /* This breaks stack unwinding for exceptions because it leaves
       MC_PUSHED_PC tags in the unwound stack frames.  */
    ee_actions[SIM_ERR_CORRUPT_STACK] = SIM_ERRACTION_IGNORE;
  }
  
  void
  execution_error_init_standalone (void)
  {
    int i;
  
    for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
      ee_actions[i] = SIM_ERRACTION_EXIT;
  
    ee_overrides ();
  }
  
  void
  execution_error_init_debugger (void)
  {
    int i;
  
    for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
      ee_actions[i] = SIM_ERRACTION_DEBUG;
  
    ee_overrides ();
  }
  
  void
  execution_error_exit_all (void)
  {
    int i;
  
    for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
      ee_actions[i] = SIM_ERRACTION_EXIT;
  }
  
  void
  execution_error_warn_all (void)
  {
    int i;
  
    for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
      ee_actions[i] = SIM_ERRACTION_WARN;
  }
  
  void
  execution_error_ignore_all (void)
  {
    int i;
  
    for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
      ee_actions[i] = SIM_ERRACTION_IGNORE;
  }
  
  void
  execution_error (enum execution_error num, unsigned long address)
  {
    if (ee_actions[num] != SIM_ERRACTION_IGNORE)
      last_error = num;
  
    if (ee_actions[num] == SIM_ERRACTION_EXIT
        || ee_actions[num] == SIM_ERRACTION_WARN)
      {
        switch (num)
  	{
  	case SIM_ERR_READ_UNWRITTEN_PAGES:
  	case SIM_ERR_READ_UNWRITTEN_BYTES:
  	  printf("Read from unwritten memory at 0x%lx\n", address);
  	  break;
  
  	case SIM_ERR_NULL_POINTER_DEREFERENCE:
  	  printf ("NULL pointer dereference\n");
  	  break;
  
  	case SIM_ERR_CORRUPT_STACK:
  	  printf ("Stack corruption detected at 0x%lx\n", address);
  	  break;
  
  	default:
  	  printf ("Unknown execution error %d\n", num);
  	  exit (1);
  	}
      }
  
    if (ee_actions[num] == SIM_ERRACTION_EXIT)
      exit (1);
  }
  
  enum execution_error
  execution_error_get_last_error (void)
  {
    return last_error;
  }
  
  void
  execution_error_clear_last_error (void)
  {
    last_error = SIM_ERR_NONE;
  }
  
  void
  execution_error_set_action (enum execution_error num, enum execution_error_action act)
  {
    ee_actions[num] = act;
  }
  