sim/rx/err.c

   1 /* err.c --- handle errors for RX simulator.
   2
   3 Copyright (C) 2008-2022 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26
  27 #include "err.h"
  28
  29 static unsigned char ee_actions[SIM_ERR_NUM_ERRORS];
  30
  31 static enum execution_error last_error;
  32
  33 static void
  34 ee_overrides (void)
  35 {
  36   /* GCC may initialize a bitfield by reading the uninitialized byte,
  37      masking in the bitfield, and writing the byte back out.  */
  38   ee_actions[SIM_ERR_READ_UNWRITTEN_BYTES] = SIM_ERRACTION_IGNORE;
  39   /* This breaks stack unwinding for exceptions because it leaves
  40      MC_PUSHED_PC tags in the unwound stack frames.  */
  41   ee_actions[SIM_ERR_CORRUPT_STACK] = SIM_ERRACTION_IGNORE;
  42 }
  43
  44 void
  45 execution_error_init_standalone (void)
  46 {
  47   int i;
  48
  49   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  50     ee_actions[i] = SIM_ERRACTION_EXIT;
  51
  52   ee_overrides ();
  53 }
  54
  55 void
  56 execution_error_init_debugger (void)
  57 {
  58   int i;
  59
  60   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  61     ee_actions[i] = SIM_ERRACTION_DEBUG;
  62
  63   ee_overrides ();
  64 }
  65
  66 void
  67 execution_error_warn_all (void)
  68 {
  69   int i;
  70
  71   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  72     ee_actions[i] = SIM_ERRACTION_WARN;
  73 }
  74
  75 void
  76 execution_error_ignore_all (void)
  77 {
  78   int i;
  79
  80   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  81     ee_actions[i] = SIM_ERRACTION_IGNORE;
  82 }
  83
  84 void
  85 execution_error (enum execution_error num, unsigned long address)
  86 {
  87   if (ee_actions[num] != SIM_ERRACTION_IGNORE)
  88     last_error = num;
  89
  90   if (ee_actions[num] == SIM_ERRACTION_EXIT
  91       || ee_actions[num] == SIM_ERRACTION_WARN)
  92     {
  93       switch (num)
  94         {
  95         case SIM_ERR_READ_UNWRITTEN_PAGES:
  96         case SIM_ERR_READ_UNWRITTEN_BYTES:
  97           printf("Read from unwritten memory at 0x%lx\n", address);
  98           break;
  99
 100         case SIM_ERR_NULL_POINTER_DEREFERENCE:
 101           printf ("NULL pointer dereference\n");
 102           break;
 103
 104         case SIM_ERR_CORRUPT_STACK:
 105           printf ("Stack corruption detected at 0x%lx\n", address);
 106           break;
 107
 108         default:
 109           printf ("Unknown execution error %d\n", num);
 110           exit (1);
 111         }
 112     }
 113
 114   if (ee_actions[num] == SIM_ERRACTION_EXIT)
 115     exit (1);
 116 }
 117
 118 enum execution_error
 119 execution_error_get_last_error (void)
 120 {
 121   return last_error;
 122 }
 123
 124 void
 125 execution_error_clear_last_error (void)
 126 {
 127   last_error = SIM_ERR_NONE;
 128 }
 129
 130 void
 131 execution_error_set_action (enum execution_error num, enum execution_error_action act)
 132 {
 133   ee_actions[num] = act;
 134 }