/* src/vm/jit/powerpc/md.h - machine dependent PowerPC functions

   Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
   C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   J. Wenninger, Institut f. Computersprachen - TU Wien

   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.

*/


#ifndef _VM_JIT_POWERPC_MD_H
#define _VM_JIT_POWERPC_MD_H

#include "config.h"

#include <assert.h>
#include <stdint.h>

#include "vm/jit/powerpc/codegen.h"

#include "vm/global.h"
#include "vm/vm.h"

#include "vm/jit/asmpart.h"
#include "vm/jit/codegen-common.h"


/* md_stacktrace_get_returnaddress *********************************************

   Returns the return address of the current stackframe, specified by
   the passed stack pointer and the stack frame size.

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

inline static void *md_stacktrace_get_returnaddress(void *sp, int32_t stackframesize)
{
	void *ra;

	/* Pn PowerPC the return address is located in the linkage
	   area. */

	ra = *((void **) (((uintptr_t) sp) + stackframesize + LA_LR_OFFSET));

	return ra;
}


/* md_codegen_get_pv_from_pc ***************************************************

   Machine code:

   7d6802a6    mflr    r11
   39abffe0    addi    r13,r11,-32

   or

   7d6802a6    mflr    r11
   3dabffff    addis   r13,r11,-1
   39ad68b0    addi    r13,r13,26800

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

inline static u1 *md_codegen_get_pv_from_pc(u1 *ra)
{
	u1 *pv;
	u4  mcode;
	s4  offset;

	/* get first instruction word after jump */

	mcode = *((u4 *) (ra + 1 * 4));

	/* check if we have 2 instructions (addis, addi) */

	if ((mcode >> 16) == 0x3dab) {
		/* get displacement of first instruction (addis) */

		offset = (s4) (mcode << 16);

		/* get displacement of second instruction (addi) */

		mcode = *((u4 *) (ra + 2 * 4));

		/* check for addi instruction */

		assert((mcode >> 16) == 0x39ad);

		offset += (s2) (mcode & 0x0000ffff);

	} else {
		/* check for addi instruction */

		assert((mcode >> 16) == 0x39ab);

		/* get offset of first instruction (addi) */

		offset = (s2) (mcode & 0x0000ffff);
	}

	/* calculate PV via RA + offset */

	pv = ra + offset;

	return pv;
}


/* md_cacheflush ***************************************************************

   Calls the system's function to flush the instruction and data
   cache.

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

inline static void md_cacheflush(void *addr, int nbytes)
{
	asm_cacheflush(addr, nbytes);
}


/* md_icacheflush **************************************************************

   Calls the system's function to flush the instruction cache.

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

inline static void md_icacheflush(void *addr, int nbytes)
{
	asm_cacheflush(addr, nbytes);
}


/* md_dcacheflush **************************************************************

   Calls the system's function to flush the data cache.

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

inline static void md_dcacheflush(void *addr, int nbytes)
{
	asm_cacheflush(addr, nbytes);
}

#endif /* _VM_JIT_POWERPC_MD_H */


/*
 * 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:
 */