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/*
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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __FPA11_H__
#define __FPA11_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 unsigned int *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. */
} FPA11;
extern FPA11* qemufpa;
extern void resetFPA11(void);
extern void SetRoundingMode(const unsigned int);
extern void SetRoundingPrecision(const unsigned int);
#define get_user(x,y) ((x)=*(y))
#define put_user(x,y) (*(y)=(x))
static inline unsigned int readRegister(unsigned int reg)
{
return (user_registers[(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[(x)]=(y);
}
static inline void writeConditionCodes(unsigned int x)
{
#if 0
unsigned int y;
unsigned int ZF;
printf("setting flags to %x from %x\n",x,user_registers[16]);
#endif
user_registers[16]=(x); // cpsr
user_registers[17]=(x>>29)&1; // cf
user_registers[18]=(x<<3)&(1<<31); // vf
user_registers[19]=x&(1<<31); // nzf
if(!(x&(1<<30))) user_registers[19]++; // nzf must be non-zero for zf to be cleared
#if 0
ZF = (user_registers[19] == 0);
y=user_registers[16] | (user_registers[19] & 0x80000000) | (ZF << 30) |
(user_registers[17] << 29) | ((user_registers[18] & 0x80000000) >> 3);
if(y != x)
printf("GODDAM SHIIIIIIIIIIIIIIIIT! %x %x nzf %x zf %x\n",x,y,user_registers[19],ZF);
#endif
}
#define REG_PC 15
unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, unsigned int* qregs);
#endif
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