sim/rx/err.c

/* err.c --- handle errors for RX simulator.

Copyright (C) 2008, 2009, 2010 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;
}