sim/rx/err.c

   1 /* err.c --- handle errors for RX simulator.
   2
   3 Copyright (C) 2008-2021 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 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 #include "err.h"
  25
  26 static unsigned char ee_actions[SIM_ERR_NUM_ERRORS];
  27
  28 static enum execution_error last_error;
  29
  30 static void
  31 ee_overrides (void)
  32 {
  33   /* GCC may initialize a bitfield by reading the uninitialized byte,
  34      masking in the bitfield, and writing the byte back out.  */
  35   ee_actions[SIM_ERR_READ_UNWRITTEN_BYTES] = SIM_ERRACTION_IGNORE;
  36   /* This breaks stack unwinding for exceptions because it leaves
  37      MC_PUSHED_PC tags in the unwound stack frames.  */
  38   ee_actions[SIM_ERR_CORRUPT_STACK] = SIM_ERRACTION_IGNORE;
  39 }
  40
  41 void
  42 execution_error_init_standalone (void)
  43 {
  44   int i;
  45
  46   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  47     ee_actions[i] = SIM_ERRACTION_EXIT;
  48
  49   ee_overrides ();
  50 }
  51
  52 void
  53 execution_error_init_debugger (void)
  54 {
  55   int i;
  56
  57   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  58     ee_actions[i] = SIM_ERRACTION_DEBUG;
  59
  60   ee_overrides ();
  61 }
  62
  63 void
  64 execution_error_warn_all (void)
  65 {
  66   int i;
  67
  68   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  69     ee_actions[i] = SIM_ERRACTION_WARN;
  70 }
  71
  72 void
  73 execution_error_ignore_all (void)
  74 {
  75   int i;
  76
  77   for (i = 0; i < SIM_ERR_NUM_ERRORS; i++)
  78     ee_actions[i] = SIM_ERRACTION_IGNORE;
  79 }
  80
  81 void
  82 execution_error (enum execution_error num, unsigned long address)
  83 {
  84   if (ee_actions[num] != SIM_ERRACTION_IGNORE)
  85     last_error = num;
  86
  87   if (ee_actions[num] == SIM_ERRACTION_EXIT
  88       || ee_actions[num] == SIM_ERRACTION_WARN)
  89     {
  90       switch (num)
  91         {
  92         case SIM_ERR_READ_UNWRITTEN_PAGES:
  93         case SIM_ERR_READ_UNWRITTEN_BYTES:
  94           printf("Read from unwritten memory at 0x%lx\n", address);
  95           break;
  96
  97         case SIM_ERR_NULL_POINTER_DEREFERENCE:
  98           printf ("NULL pointer dereference\n");
  99           break;
 100
 101         case SIM_ERR_CORRUPT_STACK:
 102           printf ("Stack corruption detected at 0x%lx\n", address);
 103           break;
 104
 105         default:
 106           printf ("Unknown execution error %d\n", num);
 107           exit (1);
 108         }
 109     }
 110
 111   if (ee_actions[num] == SIM_ERRACTION_EXIT)
 112     exit (1);
 113 }
 114
 115 enum execution_error
 116 execution_error_get_last_error (void)
 117 {
 118   return last_error;
 119 }
 120
 121 void
 122 execution_error_clear_last_error (void)
 123 {
 124   last_error = SIM_ERR_NONE;
 125 }
 126
 127 void
 128 execution_error_set_action (enum execution_error num, enum execution_error_action act)
 129 {
 130   ee_actions[num] = act;
 131 }