sysdeps/mach/hurd/i386/exc2signal.c

   1 /* Translate Mach exception codes into signal numbers.  i386 version.
   2    Copyright (C) 1991-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <hurd.h>
  20 #include <hurd/signal.h>
  21 #include <mach/exception.h>
  22
  23 /* Translate the Mach exception codes, as received in an `exception_raise' RPC,
  24    into a signal number and signal subcode.  */
  25
  26 void
  27 _hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)
  28 {
  29   detail->error = 0;
  30
  31   switch (detail->exc)
  32     {
  33     default:
  34       *signo = SIGIOT;
  35       detail->code = detail->exc;
  36       break;
  37
  38     case EXC_BAD_ACCESS:
  39       if (detail->exc_code == KERN_INVALID_ADDRESS
  40           || detail->exc_code == KERN_PROTECTION_FAILURE
  41           || detail->exc_code == KERN_WRITE_PROTECTION_FAILURE)
  42         *signo = SIGSEGV;
  43       else
  44         *signo = SIGBUS;
  45       detail->code = detail->exc_subcode;
  46       detail->error = detail->exc_code;
  47       break;
  48
  49     case EXC_BAD_INSTRUCTION:
  50       *signo = SIGILL;
  51       if (detail->exc_code == EXC_I386_INVOP)
  52         detail->code = ILL_INVOPR_FAULT;
  53       else if (detail->exc_code == EXC_I386_STKFLT)
  54         detail->code = ILL_STACK_FAULT;
  55       else
  56         detail->code = 0;
  57       break;
  58
  59     case EXC_ARITHMETIC:
  60       switch (detail->exc_code)
  61         {
  62         case EXC_I386_DIV:      /* integer divide by zero */
  63           *signo = SIGFPE;
  64           detail->code = FPE_INTDIV_FAULT;
  65           break;
  66
  67         case EXC_I386_INTO:     /* integer overflow */
  68           *signo = SIGFPE;
  69           detail->code = FPE_INTOVF_TRAP;
  70           break;
  71
  72           /* These aren't anywhere documented or used in Mach 3.0.  */
  73         case EXC_I386_NOEXT:
  74         case EXC_I386_EXTOVR:
  75         default:
  76           *signo = SIGFPE;
  77           detail->code = 0;
  78           break;
  79
  80         case EXC_I386_EXTERR:
  81           /* Subcode is the fp_status word saved by the hardware.
  82              Give an error code corresponding to the first bit set.  */
  83           if (detail->exc_subcode & FPS_IE)
  84             {
  85               *signo = SIGILL;
  86               detail->code = ILL_FPEOPR_FAULT;
  87             }
  88           else if (detail->exc_subcode & FPS_DE)
  89             {
  90               *signo = SIGFPE;
  91               detail->code = FPE_FLTDNR_FAULT;
  92             }
  93           else if (detail->exc_subcode & FPS_ZE)
  94             {
  95               *signo = SIGFPE;
  96               detail->code = FPE_FLTDIV_FAULT;
  97             }
  98           else if (detail->exc_subcode & FPS_OE)
  99             {
 100               *signo = SIGFPE;
 101               detail->code = FPE_FLTOVF_FAULT;
 102             }
 103           else if (detail->exc_subcode & FPS_UE)
 104             {
 105               *signo = SIGFPE;
 106               detail->code = FPE_FLTUND_FAULT;
 107             }
 108           else if (detail->exc_subcode & FPS_PE)
 109             {
 110               *signo = SIGFPE;
 111               detail->code = FPE_FLTINX_FAULT;
 112             }
 113           else
 114             {
 115               *signo = SIGFPE;
 116               detail->code = 0;
 117             }
 118           break;
 119
 120           /* These two can only be arithmetic exceptions if we
 121              are in V86 mode, which sounds like emulation to me.
 122              (See Mach 3.0 i386/trap.c.)  */
 123         case EXC_I386_EMERR:
 124           *signo = SIGFPE;
 125           detail->code = FPE_EMERR_FAULT;
 126           break;
 127         case EXC_I386_BOUND:
 128           *signo = SIGFPE;
 129           detail->code = FPE_EMBND_FAULT;
 130           break;
 131         }
 132       break;
 133
 134     case EXC_EMULATION:
 135       /* 3.0 doesn't give this one, why, I don't know.  */
 136       *signo = SIGEMT;
 137       detail->code = 0;
 138       break;
 139
 140     case EXC_SOFTWARE:
 141       /* The only time we get this in Mach 3.0
 142          is for an out of bounds trap.  */
 143       if (detail->exc_code == EXC_I386_BOUND)
 144         {
 145           *signo = SIGFPE;
 146           detail->code = FPE_SUBRNG_FAULT;
 147         }
 148       else
 149         {
 150           *signo = SIGEMT;
 151           detail->code = 0;
 152         }
 153       break;
 154
 155     case EXC_BREAKPOINT:
 156       *signo = SIGTRAP;
 157       if (detail->exc_code == EXC_I386_SGL)
 158         detail->code = DBG_SINGLE_TRAP;
 159       else if (detail->exc_code == EXC_I386_BPT)
 160         detail->code = DBG_BRKPNT_FAULT;
 161       else
 162         detail->code = 0;
 163       break;
 164     }
 165 }