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 "sbcl.h"
  21 #include "arch.h"
  22 #include "signal.h"
  23
  24 #include "runtime.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 #include "thread.h"
  31 \f
  32 /* the way that we shut down the system on a fatal error */
  33
  34 static void
  35 default_lossage_handler(void)
  36 {
  37     exit(1);
  38 }
  39 static void (*lossage_handler)(void) = default_lossage_handler;
  40 void
  41 set_lossage_handler(void handler(void))
  42 {
  43     lossage_handler = handler;
  44 }
  45
  46 never_returns
  47 lose(char *fmt, ...)
  48 {
  49     va_list ap;
  50     fprintf(stderr, "fatal error encountered in SBCL pid %d",getpid());
  51 #if defined(LISP_FEATURE_SB_THREAD)
  52     fprintf(stderr, "(tid %ld)",thread_self());
  53 #endif
  54     if (fmt) {
  55         fprintf(stderr, ":\n");
  56         va_start(ap, fmt);
  57         vfprintf(stderr, fmt, ap);
  58         va_end(ap);
  59     }
  60     fprintf(stderr, "\n");
  61     fflush(stderr);
  62     lossage_handler();
  63     fprintf(stderr, "Argh! lossage_handler() returned, total confusion..\n");
  64     exit(1);
  65 }
  66 \f
  67 /* internal error handler for when the Lisp error system doesn't exist
  68  *
  69  * FIXME: Shouldn't error output go to stderr instead of stdout? (Alas,
  70  * this'd require changes in a number of things like brief_print(..),
  71  * or I'd have changed it immediately.) */
  72 void
  73 describe_internal_error(os_context_t *context)
  74 {
  75     unsigned char *ptr = arch_internal_error_arguments(context);
  76     int len, scoffset, sc, offset, ch;
  77
  78     len = *ptr++;
  79     printf("internal error #%d\n", *ptr++);
  80     len--;
  81     while (len > 0) {
  82         scoffset = *ptr++;
  83         len--;
  84         if (scoffset == 253) {
  85             scoffset = *ptr++;
  86             len--;
  87         }
  88         else if (scoffset == 254) {
  89             scoffset = ptr[0] + ptr[1]*256;
  90             ptr += 2;
  91             len -= 2;
  92         }
  93         else if (scoffset == 255) {
  94             scoffset = ptr[0] + (ptr[1]<<8) + (ptr[2]<<16) + (ptr[3]<<24);
  95             ptr += 4;
  96             len -= 4;
  97         }
  98         sc = scoffset & 0x1f;
  99         offset = scoffset >> 5;
 100
 101         printf("    SC: %d, Offset: %d", sc, offset);
 102         switch (sc) {
 103         case sc_AnyReg:
 104         case sc_DescriptorReg:
 105             putchar('\t');
 106             brief_print(*os_context_register_addr(context, offset));
 107             break;
 108
 109         case sc_CharacterReg:
 110             ch = *os_context_register_addr(context, offset);
 111 #ifdef LISP_FEATURE_X86
 112             if (offset&1)
 113                 ch = ch>>8;
 114             ch = ch & 0xff;
 115 #endif
 116             switch (ch) {
 117             case '\n': printf("\t'\\n'\n"); break;
 118             case '\b': printf("\t'\\b'\n"); break;
 119             case '\t': printf("\t'\\t'\n"); break;
 120             case '\r': printf("\t'\\r'\n"); break;
 121             default:
 122                 if (ch < 32 || ch > 127)
 123                     printf("\\%03o", ch);
 124                 else
 125                     printf("\t'%c'\n", ch);
 126                 break;
 127             }
 128             break;
 129         case sc_SapReg:
 130 #ifdef sc_WordPointerReg
 131         case sc_WordPointerReg:
 132 #endif
 133             printf("\t0x%08lx\n", (unsigned long) *os_context_register_addr(context, offset));
 134             break;
 135         case sc_SignedReg:
 136             printf("\t%ld\n", (long) *os_context_register_addr(context, offset));
 137             break;
 138         case sc_UnsignedReg:
 139             printf("\t%lu\n", (unsigned long) *os_context_register_addr(context, offset));
 140             break;
 141 #ifdef sc_SingleFloatReg
 142         case sc_SingleFloatReg:
 143             printf("\t%g\n", *(float *)&context->sc_fpregs[offset]);
 144             break;
 145 #endif
 146 #ifdef sc_DoubleFloatReg
 147         case sc_DoubleFloatReg:
 148             printf("\t%g\n", *(double *)&context->sc_fpregs[offset]);
 149             break;
 150 #endif
 151         default:
 152             printf("\t???\n");
 153             break;
 154         }
 155     }
 156 }
 157 \f
 158 /* utility routines used by miscellaneous pieces of code */
 159
 160 lispobj debug_print(lispobj string)
 161 {
 162     /* This is a kludge.  It's not actually safe - in general - to use
 163        %primitive print on the alpha, because it skips half of the
 164        number stack setup that should usually be done on a function
 165        call, so the called routine (i.e. this one) ends up being able
 166        to overwrite local variables in the caller.  Rather than fix
 167        this everywhere that %primitive print is used (it's only a
 168        debugging aid anyway) we just guarantee our safety by putting
 169        an unused buffer on the stack before doing anything else
 170        here */
 171     char untouched[32];
 172     fprintf(stderr, "%s\n",
 173             (char *)(((struct vector *)native_pointer(string))->data));
 174     /* shut GCC up about not using this, because that's the point.. */
 175     if (untouched);
 176     return NIL;
 177 }