/* src/vm/jit/sparc64/md-abi.h - defines for Sparc ABI

   Copyright (C) 1996-2005, 2006 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.

   Contact: cacao@cacaojvm.org

   Authors: Alexander Jordan

   Changes:

   $Id: md-abi.h 4357 2006-01-22 23:33:38Z twisti $

*/

#ifndef _MD_ABI_H
#define _MD_ABI_H

/* preallocated registers *****************************************************/

/* integer registers */
  
#define REG_RESULT_CALLEE	24   /* to deliver method results				  */
#define REG_RESULT_CALLER	 8   /* to read method results                    */

#define REG_RA_CALLEE     	31   /* callee reads return address here          */
#define REG_RA_CALLER     	15   /* caller puts address of call instr here    */

#define REG_PV_CALLEE  		29   /* procedure vector, as found by callee	  */
#define REG_PV_CALLER		13   /* caller provides PV here */


#define REG_METHODPTR    2   /* pointer to the place from where the procedure */
                             /* vector has been fetched         */
                             
                             
#define REG_ITMP1        1   /* temporary register (scratch)                  */
#define REG_ITMP2        2   /* temporary register (application)              */
#define REG_ITMP3        3   /* temporary register (application)              */

#define REG_ITMP2_XPTR   2   /* exception pointer = temporary register 2      */
#define REG_ITMP3_XPC    3   /* exception pc = temporary register 3           */

#define REG_SP          14   /* stack pointer                                 */
#define REG_FP          30   /* frame pointer                                 */
#define REG_ZERO         0   /* always zero                                   */

#define REG_OUT0         8   /* define some argument registers                */
#define REG_OUT1         9
#define REG_OUT2        10
#define REG_OUT3        11
#define REG_OUT4        12
#define REG_OUT5        13   /* available only when doing a C-call            */

/* floating point registers */
/* only using the lower half of the floating registers for now */


#define REG_FRESULT      0   /* to deliver floating point method results      */

#define REG_FTMP1        1   /* temporary floating point register             */
#define REG_FTMP2        2   /* temporary floating point register             */
#define REG_FTMP3        3   /* temporary floating point register             */

#define REG_IFTMP        1   /* temporary integer and floating point register */

#define REG_F0           0


#define INT_REG_CNT     32   /* number of integer registers                   */
#define INT_SAV_CNT     13   /* number of int callee saved registers          */
#define INT_ARG_CNT      5   /* number of int argument registers (-1 for PV)  */
#define INT_TMP_CNT      0   /* int temp registers (%g4-%g5)                  */
#define INT_RES_CNT     14   /* number of reserved integer registers          */
                             /* pv, zero, %g6, %g7, sp, ra                    */

#define FLT_REG_CNT     16   /* number of float registers                     */
#define FLT_SAV_CNT      0   /* number of flt callee saved registers          */
#define FLT_ARG_CNT      5   /* number of flt argument registers              */
#define FLT_TMP_CNT      7   /* number of flt temp registers                  */
#define FLT_RES_CNT      3   /* number of reserved float registers            */
                             /* the one "missing" register is the return reg  */
                             
/* different argument counts when following the ABI for native functions */
#define INT_NATARG_CNT   6
#define FLT_NATARG_CNT  16

#define TRACE_ARGS_NUM   6

/* helpers for stack addressing and window handling */

#define BIAS          2047    /* SPARC V9: stack @ address SP + BIAS           */

/* SPARC ABI always wants argument slots on the stack, even when not used */

#define WINSAVE_CNT     16    /* number of regs that SPARC saves onto stack    */
#define ABIPARAMS_CNT    6    /* param slots the ABI always requires on stack  */

#define JITSTACK_CNT    (WINSAVE_CNT + ABIPARAMS_CNT)
#define CSTACK_CNT      (WINSAVE_CNT + ABIPARAMS_CNT)

#define JITSTACK        ((JITSTACK_CNT) * 8 + BIAS)
#define CSTACK          ((CSTACK_CNT) * 8 + BIAS)



/* applies when the caller's window was saved */
#define REG_WINDOW_TRANSPOSE(reg) \
	(reg + 16)

#endif /* _MD_ABI_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:
 */