md-os.cpp

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/* src/vm/jit/x86_64/freebsd/md-os.cpp - machine dependent x86_64 FreeBSD functions

   Copyright (C) 1996-2013
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   Copyright (C) 2009 Theobroma Systems Ltd.

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

*/


#include "config.h"

#include <cassert>
#include <cstdlib>
#include <ucontext.h>

#include "threads/thread.hpp"

#include "vm/signallocal.hpp"

#include "vm/jit/asmpart.hpp"
#include "vm/jit/stacktrace.hpp"


/* md_signal_handler_sigsegv ***************************************************

   NullPointerException signal handler for hardware null pointer
   check.

*******************************************************************************/

void md_signal_handler_sigsegv(int sig, siginfo_t *siginfo, void *_p)
{
    ucontext_t *_uc;
    mcontext_t *_mc;
    u1         *sp;
    u1         *ra;
    u1         *xpc;

    _uc = (ucontext_t *) _p;
    _mc = &_uc->uc_mcontext;

    sp  = (u1 *) _mc->mc_rsp;
    xpc = (u1 *) _mc->mc_rip;
    ra  = xpc;                          /* return address is equal to xpc     */

#if 0
    /* check for StackOverflowException */

    threads_check_stackoverflow(sp);
#endif

    _mc->mc_rax =
        (ptrint) stacktrace_hardware_nullpointerexception(NULL, sp, ra, xpc);

    _mc->mc_r10 = (ptrint) xpc;                              /* REG_ITMP2_XPC */
    _mc->mc_rip = (ptrint) asm_handle_exception;
}


/* md_signal_handler_sigfpe ****************************************************

   ArithmeticException signal handler for hardware divide by zero
   check.

*******************************************************************************/

void md_signal_handler_sigfpe(int sig, siginfo_t *siginfo, void *_p)
{
    ucontext_t  *_uc;
    mcontext_t  *_mc;
    u1          *sp;
    u1          *ra;
    u1          *xpc;

    _uc = (ucontext_t *) _p;
    _mc = &_uc->uc_mcontext;

    sp  = (u1 *) _mc->mc_rsp;
    xpc = (u1 *) _mc->mc_rip;
    ra  = xpc;                          /* return address is equal to xpc     */

    _mc->mc_rax =
        (ptrint) stacktrace_hardware_arithmeticexception(NULL, sp, ra, xpc);

    _mc->mc_r10 = (ptrint) xpc;                              /* REG_ITMP2_XPC */
    _mc->mc_rip = (ptrint) asm_handle_exception;
}


/* md_signal_handler_sigusr2 ***************************************************

   Signal handler for profiling sampling.

*******************************************************************************/

void md_signal_handler_sigusr2(int sig, siginfo_t *siginfo, void *_p)
{
    threadobject *t;
    ucontext_t   *_uc;
    mcontext_t   *_mc;
    u1           *pc;

    t = THREADOBJECT;

    _uc = (ucontext_t *) _p;
    _mc = &_uc->uc_mcontext;

    pc = (u1 *) _mc->mc_rip;

    t->pc = pc;
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c++
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 * vim:noexpandtab:sw=4:ts=4:
 */