/* src/vm/jit/powerpc/netbsd/md-os.c - machine dependent PowerPC NetBSD functions

   Copyright (C) 1996-2005, 2006, 2008
   CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO

   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 <ucontext.h>

#include "vm/types.h"

#include "vm/jit/powerpc/netbsd/md-abi.h"

#include "vm/signallocal.hpp"

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


/* md_signal_handle_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;
	u4           instr;
	s4           reg;
	ptrint       addr;
	u1          *pv;
	u1          *sp;
	u1          *ra;
	u1          *xpc;

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

	instr = *((u4 *) _mc->gregs[PT_NIP]);
	reg = (instr >> 16) & 0x1f;
	addr = _mc->gregs[reg];

	if (addr == 0) {
		pv  = (u1 *) _mc->gregs[REG_PV];
		sp  = (u1 *) _mc->gregs[REG_SP];
		ra  = (u1 *) _mc->gregs[PT_LNK];         /* this is correct for leafs */
		xpc = (u1 *) _mc->gregs[PT_NIP];

		_mc->gregs[REG_ITMP1_XPTR] =
			(ptrint) stacktrace_hardware_nullpointerexception(pv, sp, ra, xpc);

		_mc->gregs[REG_ITMP2_XPC] = (ptrint) xpc;
		_mc->gregs[PT_NIP] = (ptrint) asm_handle_exception;

	} else {
		throw_cacao_exception_exit(string_java_lang_InternalError,
								   "Segmentation fault: 0x%08lx at 0x%08lx",
								   addr, _mc->gregs[PT_NIP]);
	}		
}


/*
 * 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:
 */
