/* 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() ((FPA11 *)(¤t_thread_info()->fpstate)) /* * 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. */ #define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1) #include <linux/thread_info.h> /* includes */ #include "fpsr.h" /* FP control and status register definitions */ #include "milieu.h" struct roundingData { int8 mode; int8 precision; signed char exception; }; #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 { float32 fSingle; float64 fDouble; #ifdef CONFIG_FPE_NWFPE_XP floatx80 fExtended; #else u32 padding[3]; #endif } __attribute__ ((packed,aligned(4))) 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 <asm/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. */ } __attribute__ ((packed,aligned(4))) FPA11; extern int8 SetRoundingMode(const unsigned int); extern int8 SetRoundingPrecision(const unsigned int); extern void nwfpe_init_fpa(union fp_state *fp); extern unsigned int EmulateAll(unsigned int opcode); extern unsigned int EmulateCPDT(const unsigned int opcode); extern unsigned int EmulateCPDO(const unsigned int opcode); extern unsigned int EmulateCPRT(const unsigned int opcode); /* fpa11_cpdt.c */ extern unsigned int PerformLDF(const unsigned int opcode); extern unsigned int PerformSTF(const unsigned int opcode); extern unsigned int PerformLFM(const unsigned int opcode); extern unsigned int PerformSFM(const unsigned int opcode); /* single_cpdo.c */ extern unsigned int SingleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); /* double_cpdo.c */ extern unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); /* extneded_cpdo.c */ extern unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd); #endif