sysdeps/mach/hurd/mips/exc2signal.c

   1 /* Translate Mach exception codes into signal numbers.  MIPS version.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <hurd.h>
  21 #include <hurd/signal.h>
  22 #include <mach/exception.h>
  23
  24 /* Translate the Mach exception codes, as received in an `exception_raise' RPC,
  25    into a signal number and signal subcode.  */
  26
  27 void
  28 _hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)
  29 {
  30   detail->error = 0;
  31
  32   switch (detail->exc)
  33     {
  34     default:
  35       *signo = SIGIOT;
  36       detail->code = detail->exc;
  37       break;
  38
  39     case EXC_BAD_ACCESS:
  40       if (detail->exc_code == KERN_PROTECTION_FAILURE)
  41         *signo = SIGSEGV;
  42       else
  43         *signo = SIGBUS;
  44       detail->code = detail->exc_subcode;
  45       detail->error = detail->exc_code;
  46       break;
  47
  48     case EXC_BAD_INSTRUCTION:
  49       *signo = SIGILL;
  50       if (detail->exc_code == EXC_MIPS_II)
  51         detail->code = detail->exc_subcode;
  52       else
  53         detail->code = 0;
  54       break;
  55
  56     case EXC_ARITHMETIC:
  57       switch (detail->exc_code)
  58         {
  59         case EXC_MIPS_OV:       /* integer overflow */
  60           *signo = SIGFPE;
  61           detail->code = detail->exc_subcode;
  62           break;
  63
  64         default:
  65           *signo = SIGFPE;
  66           detail->code = 0;
  67           break;
  68
  69         case EXC_MIPS_INT:
  70           /* Subcode is the fp_status word saved by the hardware.
  71              Give an error code corresponding to the first bit set.  */
  72           if (detail->exc_subcode == EXC_MIPS_FLT_UNIMP)
  73             *signo = SIGILL;
  74           else
  75             *signo = SIGFPE;
  76           detail->code = detail->exc_subcode;
  77           break;
  78         }
  79       break;
  80
  81     case EXC_EMULATION:
  82       /* 3.0 doesn't give this one, why, I don't know.  */
  83       *signo = SIGEMT;
  84       detail->code = 0;
  85       break;
  86
  87     case EXC_SOFTWARE:
  88       *signo = SIGEMT;
  89       detail->code = 0;
  90       break;
  91
  92     case EXC_BREAKPOINT:
  93       *signo = SIGTRAP;
  94       detail->code = 0;
  95       break;
  96     }
  97 }