src/runtime/interr.c

   1 /*
   2  * stuff to handle internal errors
   3  */
   4
   5 /*
   6  * This software is part of the SBCL system. See the README file for
   7  * more information.
   8  *
   9  * This software is derived from the CMU CL system, which was
  10  * written at Carnegie Mellon University and released into the
  11  * public domain. The software is in the public domain and is
  12  * provided with absolutely no warranty. See the COPYING and CREDITS
  13  * files for more information.
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdarg.h>
  18 #include <stdlib.h>
  19
  20 #include "arch.h"
  21 #include "signal.h"
  22
  23 #include "runtime.h"
  24 #include "sbcl.h"
  25 #include "interr.h"
  26 #include "print.h"
  27 #include "lispregs.h"
  28 #include "genesis/static-symbols.h"
  29 #include "genesis/vector.h"
  30 \f
  31 /* the way that we shut down the system on a fatal error */
  32
  33 static void
  34 default_lossage_handler(void)
  35 {
  36     exit(1);
  37 }
  38 static void (*lossage_handler)(void) = default_lossage_handler;
  39 void
  40 set_lossage_handler(void handler(void))
  41 {
  42     lossage_handler = handler;
  43 }
  44
  45 never_returns
  46 lose(char *fmt, ...)
  47 {
  48     va_list ap;
  49     fprintf(stderr, "fatal error encountered in SBCL pid %d\n",getpid());
  50     if (fmt) {
  51         fprintf(stderr, ":\n");
  52         va_start(ap, fmt);
  53         vfprintf(stderr, fmt, ap);
  54         va_end(ap);
  55     }
  56     fprintf(stderr, "\n");
  57     fflush(stderr);
  58     lossage_handler();
  59     fprintf(stderr, "Argh! lossage_handler() returned, total confusion..\n");
  60     exit(1);
  61 }
  62 \f
  63 /* internal error handler for when the Lisp error system doesn't exist
  64  *
  65  * FIXME: Shouldn't error output go to stderr instead of stdout? (Alas,
  66  * this'd require changes in a number of things like brief_print(..),
  67  * or I'd have changed it immediately.) */
  68 void
  69 describe_internal_error(os_context_t *context)
  70 {
  71     unsigned char *ptr = arch_internal_error_arguments(context);
  72     int len, scoffset, sc, offset, ch;
  73
  74     len = *ptr++;
  75     printf("internal error #%d\n", *ptr++);
  76     len--;
  77     while (len > 0) {
  78         scoffset = *ptr++;
  79         len--;
  80         if (scoffset == 253) {
  81             scoffset = *ptr++;
  82             len--;
  83         }
  84         else if (scoffset == 254) {
  85             scoffset = ptr[0] + ptr[1]*256;
  86             ptr += 2;
  87             len -= 2;
  88         }
  89         else if (scoffset == 255) {
  90             scoffset = ptr[0] + (ptr[1]<<8) + (ptr[2]<<16) + (ptr[3]<<24);
  91             ptr += 4;
  92             len -= 4;
  93         }
  94         sc = scoffset & 0x1f;
  95         offset = scoffset >> 5;
  96
  97         printf("    SC: %d, Offset: %d", sc, offset);
  98         switch (sc) {
  99         case sc_AnyReg:
 100         case sc_DescriptorReg:
 101             putchar('\t');
 102             brief_print(*os_context_register_addr(context, offset));
 103             break;
 104
 105         case sc_BaseCharReg:
 106             ch = *os_context_register_addr(context, offset);
 107 #ifdef __i386__
 108             if (offset&1)
 109                 ch = ch>>8;
 110             ch = ch & 0xff;
 111 #endif
 112             switch (ch) {
 113             case '\n': printf("\t'\\n'\n"); break;
 114             case '\b': printf("\t'\\b'\n"); break;
 115             case '\t': printf("\t'\\t'\n"); break;
 116             case '\r': printf("\t'\\r'\n"); break;
 117             default:
 118                 if (ch < 32 || ch > 127)
 119                     printf("\\%03o", ch);
 120                 else
 121                     printf("\t'%c'\n", ch);
 122                 break;
 123             }
 124             break;
 125         case sc_SapReg:
 126 #ifdef sc_WordPointerReg
 127         case sc_WordPointerReg:
 128 #endif
 129             printf("\t0x%08x\n", *os_context_register_addr(context, offset));
 130             break;
 131         case sc_SignedReg:
 132             printf("\t%d\n", *os_context_register_addr(context, offset));
 133             break;
 134         case sc_UnsignedReg:
 135             printf("\t%u\n", *os_context_register_addr(context, offset));
 136             break;
 137 #ifdef sc_SingleFloatReg
 138         case sc_SingleFloatReg:
 139             printf("\t%g\n", *(float *)&context->sc_fpregs[offset]);
 140             break;
 141 #endif
 142 #ifdef sc_DoubleFloatReg
 143         case sc_DoubleFloatReg:
 144             printf("\t%g\n", *(double *)&context->sc_fpregs[offset]);
 145             break;
 146 #endif
 147         default:
 148             printf("\t???\n");
 149             break;
 150         }
 151     }
 152 }
 153 \f
 154 /* utility routines used by miscellaneous pieces of code */
 155
 156 lispobj debug_print(lispobj string)
 157 {
 158     /* This is a kludge.  It's not actually safe - in general - to use
 159        %primitive print on the alpha, because it skips half of the
 160        number stack setup that should usually be done on a function call,
 161        so the called routine (i.e. this one) ends up being able to overwrite
 162        local variables in the caller.  Rather than fix this everywhere
 163        that %primitive print is used (it's only a debugging aid anyway)
 164        we just put guarantee our safety by putting an unused buffer on
 165        the stack before doing anything else here */
 166     char untouched[32]; /* GCC warns about not using this, but that's the point.. */
 167     fprintf(stderr, "%s\n",
 168             (char *)(((struct vector *)native_pointer(string))->data),untouched);
 169     return NIL;
 170 }