Subversion Repositories openrisc_2011-10-31

/* 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;

}