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Diffstat (limited to 'target-arm/nwfpe/fpa11.h')
| -rw-r--r-- | target-arm/nwfpe/fpa11.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/target-arm/nwfpe/fpa11.h b/target-arm/nwfpe/fpa11.h new file mode 100644 index 0000000..95ad119 --- /dev/null +++ b/target-arm/nwfpe/fpa11.h @@ -0,0 +1,131 @@ +/* + 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 |