sysdeps/mach/hurd/i386/exc2signal.c

   1 /* Translate Mach exception codes into signal numbers.  i386 version.
   2    Copyright (C) 1991,1992,1994,1996,1997,2001 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_INVALID_ADDRESS
  41           || detail->exc_code == KERN_PROTECTION_FAILURE
  42           || detail->exc_code == KERN_WRITE_PROTECTION_FAILURE)
  43         *signo = SIGSEGV;
  44       else
  45         *signo = SIGBUS;
  46       detail->code = detail->exc_subcode;
  47       detail->error = detail->exc_code;
  48       break;
  49
  50     case EXC_BAD_INSTRUCTION:
  51       *signo = SIGILL;
  52       if (detail->exc_code == EXC_I386_INVOP)
  53         detail->code = ILL_INVOPR_FAULT;
  54       else if (detail->exc_code == EXC_I386_STKFLT)
  55         detail->code = ILL_STACK_FAULT;
  56       else
  57         detail->code = 0;
  58       break;
  59
  60     case EXC_ARITHMETIC:
  61       switch (detail->exc_code)
  62         {
  63         case EXC_I386_DIV:      /* integer divide by zero */
  64           *signo = SIGFPE;
  65           detail->code = FPE_INTDIV_FAULT;
  66           break;
  67
  68         case EXC_I386_INTO:     /* integer overflow */
  69           *signo = SIGFPE;
  70           detail->code = FPE_INTOVF_TRAP;
  71           break;
  72
  73           /* These aren't anywhere documented or used in Mach 3.0.  */
  74         case EXC_I386_NOEXT:
  75         case EXC_I386_EXTOVR:
  76         default:
  77           *signo = SIGFPE;
  78           detail->code = 0;
  79           break;
  80
  81         case EXC_I386_EXTERR:
  82           /* Subcode is the fp_status word saved by the hardware.
  83              Give an error code corresponding to the first bit set.  */
  84           if (detail->exc_subcode & FPS_IE)
  85             {
  86               *signo = SIGILL;
  87               detail->code = ILL_FPEOPR_FAULT;
  88             }
  89           else if (detail->exc_subcode & FPS_DE)
  90             {
  91               *signo = SIGFPE;
  92               detail->code = FPE_FLTDNR_FAULT;
  93             }
  94           else if (detail->exc_subcode & FPS_ZE)
  95             {
  96               *signo = SIGFPE;
  97               detail->code = FPE_FLTDIV_FAULT;
  98             }
  99           else if (detail->exc_subcode & FPS_OE)
 100             {
 101               *signo = SIGFPE;
 102               detail->code = FPE_FLTOVF_FAULT;
 103             }
 104           else if (detail->exc_subcode & FPS_UE)
 105             {
 106               *signo = SIGFPE;
 107               detail->code = FPE_FLTUND_FAULT;
 108             }
 109           else if (detail->exc_subcode & FPS_PE)
 110             {
 111               *signo = SIGFPE;
 112               detail->code = FPE_FLTINX_FAULT;
 113             }
 114           else
 115             {
 116               *signo = SIGFPE;
 117               detail->code = 0;
 118             }
 119           break;
 120
 121           /* These two can only be arithmetic exceptions if we
 122              are in V86 mode, which sounds like emulation to me.
 123              (See Mach 3.0 i386/trap.c.)  */
 124         case EXC_I386_EMERR:
 125           *signo = SIGFPE;
 126           detail->code = FPE_EMERR_FAULT;
 127           break;
 128         case EXC_I386_BOUND:
 129           *signo = SIGFPE;
 130           detail->code = FPE_EMBND_FAULT;
 131           break;
 132         }
 133       break;
 134
 135     case EXC_EMULATION:
 136       /* 3.0 doesn't give this one, why, I don't know.  */
 137       *signo = SIGEMT;
 138       detail->code = 0;
 139       break;
 140
 141     case EXC_SOFTWARE:
 142       /* The only time we get this in Mach 3.0
 143          is for an out of bounds trap.  */
 144       if (detail->exc_code == EXC_I386_BOUND)
 145         {
 146           *signo = SIGFPE;
 147           detail->code = FPE_SUBRNG_FAULT;
 148         }
 149       else
 150         {
 151           *signo = SIGEMT;
 152           detail->code = 0;
 153         }
 154       break;
 155
 156     case EXC_BREAKPOINT:
 157       *signo = SIGTRAP;
 158       if (detail->exc_code == EXC_I386_SGL)
 159         detail->code = DBG_SINGLE_TRAP;
 160       else if (detail->exc_code == EXC_I386_BPT)
 161         detail->code = DBG_BRKPNT_FAULT;
 162       else
 163         detail->code = 0;
 164       break;
 165     }
 166 }