Archipelago » qemu

/*

    NetWinder Floating Point Emulator

    (c) Rebel.com, 1998-1999

    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

    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 of the License, 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, see <http://www.gnu.org/licenses/>.

*/

#ifndef __FPA11_H__

#define __FPA11_H__

#include <stdlib.h>

#include <stdio.h>

#include <errno.h>

#include <cpu.h>

#define GET_FPA11() (qemufpa)

/*

 * The processes registers are always at the very top of the 8K

 * stack+task struct.  Use the same method as 'current' uses to

 * reach them.

 */

extern CPUARMState *user_registers;

#define GET_USERREG() (user_registers)

/* Need task_struct */

//#include <linux/sched.h>

/* includes */

#include "fpsr.h"                /* FP control and status register definitions */

#include "softfloat.h"

#define                typeNone                0x00

#define                typeSingle                0x01

#define                typeDouble                0x02

#define                typeExtended                0x03

/*

 * This must be no more and no less than 12 bytes.

 */

typedef union tagFPREG {

   floatx80 fExtended;

   float64  fDouble;

   float32  fSingle;

} FPREG;

/*

 * FPA11 device model.

 *

 * This structure is exported to user space.  Do not re-order.

 * Only add new stuff to the end, and do not change the size of

 * any element.  Elements of this structure are used by user

 * space, and must match struct user_fp in include/asm-arm/user.h.

 * We include the byte offsets below for documentation purposes.

 *

 * The size of this structure and FPREG are checked by fpmodule.c

 * on initialisation.  If the rules have been broken, NWFPE will

 * not initialise.

 */

typedef struct tagFPA11 {

/*   0 */  FPREG fpreg[8];                /* 8 floating point registers */

/*  96 */  FPSR fpsr;                        /* floating point status register */

/* 100 */  FPCR fpcr;                        /* floating point control register */

/* 104 */  unsigned char fType[8];        /* type of floating point value held in

                                           floating point registers.  One of none

                                           single, double or extended. */

/* 112 */  int initflag;                /* this is special.  The kernel guarantees

                                           to set it to 0 when a thread is launched,

                                           so we can use it to detect whether this

                                           instance of the emulator needs to be

                                           initialised. */

    float_status fp_status;      /* QEMU float emulator status */

} FPA11;

extern FPA11* qemufpa;

extern void resetFPA11(void);

extern void SetRoundingMode(const unsigned int);

extern void SetRoundingPrecision(const unsigned int);

static inline unsigned int readRegister(unsigned int reg)

{

    return (user_registers->regs[(reg)]);

}

static inline void writeRegister(unsigned int x, unsigned int y)

{

#if 0

        printf("writing %d to r%d\n",y,x);

#endif

        user_registers->regs[(x)]=(y);

}

static inline void writeConditionCodes(unsigned int x)

{

        cpsr_write(user_registers,x,CPSR_NZCV);

}

#define REG_PC 15

unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);

unsigned int EmulateCPDO(const unsigned int);

unsigned int EmulateCPDT(const unsigned int);

unsigned int EmulateCPRT(const unsigned int);

unsigned int SingleCPDO(const unsigned int opcode);

unsigned int DoubleCPDO(const unsigned int opcode);

unsigned int ExtendedCPDO(const unsigned int opcode);

/* included only for get_user/put_user macros */

#include "qemu.h"

#endif