a8d3431ae9
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1268 c046a42c-6fe2-441c-8c8c-71466251a162
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
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NetWinder Floating Point Emulator
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(c) Rebel.com, 1998-1999
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __FPA11_H__
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#define __FPA11_H__
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#define GET_FPA11() (qemufpa)
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/*
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* The processes registers are always at the very top of the 8K
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* stack+task struct. Use the same method as 'current' uses to
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* reach them.
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*/
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extern unsigned int *user_registers;
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#define GET_USERREG() (user_registers)
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/* Need task_struct */
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//#include <linux/sched.h>
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/* includes */
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#include "fpsr.h" /* FP control and status register definitions */
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#include "softfloat.h"
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#define typeNone 0x00
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#define typeSingle 0x01
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#define typeDouble 0x02
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#define typeExtended 0x03
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/*
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* This must be no more and no less than 12 bytes.
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*/
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typedef union tagFPREG {
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floatx80 fExtended;
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float64 fDouble;
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float32 fSingle;
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} FPREG;
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/*
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* FPA11 device model.
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*
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* This structure is exported to user space. Do not re-order.
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* Only add new stuff to the end, and do not change the size of
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* any element. Elements of this structure are used by user
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* space, and must match struct user_fp in include/asm-arm/user.h.
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* We include the byte offsets below for documentation purposes.
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*
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* The size of this structure and FPREG are checked by fpmodule.c
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* on initialisation. If the rules have been broken, NWFPE will
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* not initialise.
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*/
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typedef struct tagFPA11 {
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/* 0 */ FPREG fpreg[8]; /* 8 floating point registers */
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/* 96 */ FPSR fpsr; /* floating point status register */
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/* 100 */ FPCR fpcr; /* floating point control register */
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/* 104 */ unsigned char fType[8]; /* type of floating point value held in
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floating point registers. One of none
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single, double or extended. */
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/* 112 */ int initflag; /* this is special. The kernel guarantees
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to set it to 0 when a thread is launched,
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so we can use it to detect whether this
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instance of the emulator needs to be
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initialised. */
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} FPA11;
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extern FPA11* qemufpa;
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extern void resetFPA11(void);
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extern void SetRoundingMode(const unsigned int);
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extern void SetRoundingPrecision(const unsigned int);
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static inline unsigned int readRegister(unsigned int reg)
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{
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return (user_registers[(reg)]);
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}
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static inline void writeRegister(unsigned int x, unsigned int y)
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{
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#if 0
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printf("writing %d to r%d\n",y,x);
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#endif
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user_registers[(x)]=(y);
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}
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static inline void writeConditionCodes(unsigned int x)
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{
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#if 0
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unsigned int y;
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unsigned int ZF;
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printf("setting flags to %x from %x\n",x,user_registers[16]);
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#endif
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user_registers[16]=(x); // cpsr
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user_registers[17]=(x>>29)&1; // cf
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user_registers[18]=(x<<3)&(1<<31); // vf
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user_registers[19]=x&(1<<31); // nzf
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if(!(x&(1<<30))) user_registers[19]++; // nzf must be non-zero for zf to be cleared
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#if 0
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ZF = (user_registers[19] == 0);
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y=user_registers[16] | (user_registers[19] & 0x80000000) | (ZF << 30) |
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(user_registers[17] << 29) | ((user_registers[18] & 0x80000000) >> 3);
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if(y != x)
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printf("GODDAM SHIIIIIIIIIIIIIIIIT! %x %x nzf %x zf %x\n",x,y,user_registers[19],ZF);
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#endif
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}
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#define REG_PC 15
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unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, unsigned int* qregs);
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/* included only for get_user/put_user macros */
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#include "qemu.h"
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#endif
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