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/* Translate Mach exception codes into signal numbers. i386 version.
Copyright (C) 1991-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <hurd.h>
#include <hurd/signal.h>
#include <mach/exception.h>
/* Translate the Mach exception codes, as received in an `exception_raise' RPC,
into a signal number and signal subcode. */
void
_hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)
{
detail->error = 0;
switch (detail->exc)
{
default:
*signo = SIGIOT;
detail->code = detail->exc;
break;
case EXC_BAD_ACCESS:
if (detail->exc_code == KERN_INVALID_ADDRESS
|| detail->exc_code == KERN_PROTECTION_FAILURE
|| detail->exc_code == KERN_WRITE_PROTECTION_FAILURE)
*signo = SIGSEGV;
else
*signo = SIGBUS;
detail->code = detail->exc_subcode;
detail->error = detail->exc_code;
break;
case EXC_BAD_INSTRUCTION:
*signo = SIGILL;
if (detail->exc_code == EXC_I386_INVOP)
detail->code = ILL_INVOPR_FAULT;
else if (detail->exc_code == EXC_I386_STKFLT)
detail->code = ILL_STACK_FAULT;
else
detail->code = 0;
break;
case EXC_ARITHMETIC:
switch (detail->exc_code)
{
case EXC_I386_DIV: /* integer divide by zero */
*signo = SIGFPE;
detail->code = FPE_INTDIV_FAULT;
break;
case EXC_I386_INTO: /* integer overflow */
*signo = SIGFPE;
detail->code = FPE_INTOVF_TRAP;
break;
/* These aren't anywhere documented or used in Mach 3.0. */
case EXC_I386_NOEXT:
case EXC_I386_EXTOVR:
default:
*signo = SIGFPE;
detail->code = 0;
break;
case EXC_I386_EXTERR:
/* Subcode is the fp_status word saved by the hardware.
Give an error code corresponding to the first bit set. */
if (detail->exc_subcode & FPS_IE)
{
*signo = SIGILL;
detail->code = ILL_FPEOPR_FAULT;
}
else if (detail->exc_subcode & FPS_DE)
{
*signo = SIGFPE;
detail->code = FPE_FLTDNR_FAULT;
}
else if (detail->exc_subcode & FPS_ZE)
{
*signo = SIGFPE;
detail->code = FPE_FLTDIV_FAULT;
}
else if (detail->exc_subcode & FPS_OE)
{
*signo = SIGFPE;
detail->code = FPE_FLTOVF_FAULT;
}
else if (detail->exc_subcode & FPS_UE)
{
*signo = SIGFPE;
detail->code = FPE_FLTUND_FAULT;
}
else if (detail->exc_subcode & FPS_PE)
{
*signo = SIGFPE;
detail->code = FPE_FLTINX_FAULT;
}
else
{
*signo = SIGFPE;
detail->code = 0;
}
break;
/* These two can only be arithmetic exceptions if we
are in V86 mode, which sounds like emulation to me.
(See Mach 3.0 i386/trap.c.) */
case EXC_I386_EMERR:
*signo = SIGFPE;
detail->code = FPE_EMERR_FAULT;
break;
case EXC_I386_BOUND:
*signo = SIGFPE;
detail->code = FPE_EMBND_FAULT;
break;
}
break;
case EXC_EMULATION:
/* 3.0 doesn't give this one, why, I don't know. */
*signo = SIGEMT;
detail->code = 0;
break;
case EXC_SOFTWARE:
/* The only time we get this in Mach 3.0
is for an out of bounds trap. */
if (detail->exc_code == EXC_I386_BOUND)
{
*signo = SIGFPE;
detail->code = FPE_SUBRNG_FAULT;
}
else
{
*signo = SIGEMT;
detail->code = 0;
}
break;
case EXC_BREAKPOINT:
*signo = SIGTRAP;
if (detail->exc_code == EXC_I386_SGL)
detail->code = DBG_SINGLE_TRAP;
else if (detail->exc_code == EXC_I386_BPT)
detail->code = DBG_BRKPNT_FAULT;
else
detail->code = 0;
break;
}
}
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