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/* Translate Mach exception codes into signal numbers. i386 version.
Copyright (C) 1991-2025 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
<https://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. */
static void
exception2signal (struct hurd_signal_detail *detail, int *signo, int posix)
{
detail->error = 0;
switch (detail->exc)
{
default:
*signo = SIGIOT;
detail->code = detail->exc;
break;
case EXC_BAD_ACCESS:
switch (detail->exc_code)
{
case KERN_INVALID_ADDRESS:
case KERN_MEMORY_FAILURE:
*signo = SIGSEGV;
detail->code = posix ? SEGV_MAPERR : detail->exc_subcode;
break;
case KERN_PROTECTION_FAILURE:
case KERN_WRITE_PROTECTION_FAILURE:
*signo = SIGSEGV;
detail->code = posix ? SEGV_ACCERR : detail->exc_subcode;
break;
default:
*signo = SIGBUS;
detail->code = posix ? BUS_ADRERR : detail->exc_subcode;
break;
}
detail->error = detail->exc_code;
break;
case EXC_BAD_INSTRUCTION:
*signo = SIGILL;
switch (detail->exc_code)
{
case EXC_I386_INVOP:
detail->code = posix ? ILL_ILLOPC : ILL_INVOPR_FAULT;
break;
case EXC_I386_STKFLT:
detail->code = posix ? ILL_BADSTK : ILL_STACK_FAULT;
break;
default:
detail->code = 0;
break;
}
break;
case EXC_ARITHMETIC:
*signo = SIGFPE;
switch (detail->exc_code)
{
case EXC_I386_DIV: /* integer divide by zero */
detail->code = posix ? FPE_INTDIV : FPE_INTDIV_FAULT;
break;
case EXC_I386_INTO: /* integer overflow */
detail->code = posix ? FPE_INTOVF : FPE_INTOVF_TRAP;
break;
/* These aren't anywhere documented or used in Mach 3.0. */
case EXC_I386_NOEXT:
case EXC_I386_EXTOVR:
default:
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)
{
/* NB: We used to send SIGILL here but we can't distinguish
POSIX vs. legacy with respect to what signal we send. */
detail->code = posix ? FPE_FLTINV : 0 /*ILL_FPEOPR_FAULT*/;
}
else if (detail->exc_subcode & FPS_DE)
{
detail->code = posix ? FPE_FLTUND : FPE_FLTDNR_FAULT;
}
else if (detail->exc_subcode & FPS_ZE)
{
detail->code = posix ? FPE_FLTDIV : FPE_FLTDIV_FAULT;
}
else if (detail->exc_subcode & FPS_OE)
{
detail->code = posix ? FPE_FLTOVF : FPE_FLTOVF_FAULT;
}
else if (detail->exc_subcode & FPS_UE)
{
detail->code = posix ? FPE_FLTUND : FPE_FLTUND_FAULT;
}
else if (detail->exc_subcode & FPS_PE)
{
detail->code = posix ? FPE_FLTRES : FPE_FLTINX_FAULT;
}
else
{
detail->code = 0;
}
break;
/* These two can only be arithmetic exceptions if we
are in V86 mode. (See Mach 3.0 i386/trap.c.) */
case EXC_I386_EMERR:
detail->code = posix ? 0 : FPE_EMERR_FAULT;
break;
case EXC_I386_BOUND:
detail->code = posix ? FPE_FLTSUB : 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 = posix ? FPE_FLTSUB : FPE_SUBRNG_FAULT;
}
else
{
*signo = SIGEMT;
detail->code = 0;
}
break;
case EXC_BREAKPOINT:
*signo = SIGTRAP;
switch (detail->exc_code)
{
case EXC_I386_SGL:
detail->code = posix ? TRAP_BRKPT : DBG_SINGLE_TRAP;
break;
case EXC_I386_BPT:
detail->code = posix ? TRAP_BRKPT : DBG_BRKPNT_FAULT;
break;
default:
detail->code = 0;
break;
}
break;
}
}
libc_hidden_def (_hurd_exception2signal)
void
_hurd_exception2signal (struct hurd_signal_detail *detail, int *signo)
{
exception2signal (detail, signo, 1);
}
void
_hurd_exception2signal_legacy (struct hurd_signal_detail *detail, int *signo)
{
exception2signal (detail, signo, 0);
}
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