110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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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*/
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#ifndef __FPA11_H__
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#define __FPA11_H__
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#define GET_FPA11() ((FPA11 *)(¤t_thread_info()->fpstate))
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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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#define GET_USERREG() ((struct pt_regs *)(THREAD_START_SP + (unsigned long)current_thread_info()) - 1)
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#include <linux/thread_info.h>
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/* includes */
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#include "fpsr.h" /* FP control and status register definitions */
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#include "milieu.h"
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struct roundingData {
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int8 mode;
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int8 precision;
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signed char exception;
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};
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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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float32 fSingle;
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float64 fDouble;
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#ifdef CONFIG_FPE_NWFPE_XP
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floatx80 fExtended;
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#else
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u32 padding[3];
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#endif
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} __attribute__ ((packed,aligned(4))) 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 <asm/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
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none, 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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} __attribute__ ((packed,aligned(4))) FPA11;
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extern int8 SetRoundingMode(const unsigned int);
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extern int8 SetRoundingPrecision(const unsigned int);
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extern void nwfpe_init_fpa(union fp_state *fp);
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extern unsigned int EmulateAll(unsigned int opcode);
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extern unsigned int EmulateCPDT(const unsigned int opcode);
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extern unsigned int EmulateCPDO(const unsigned int opcode);
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extern unsigned int EmulateCPRT(const unsigned int opcode);
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/* fpa11_cpdt.c */
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extern unsigned int PerformLDF(const unsigned int opcode);
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extern unsigned int PerformSTF(const unsigned int opcode);
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extern unsigned int PerformLFM(const unsigned int opcode);
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extern unsigned int PerformSFM(const unsigned int opcode);
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/* single_cpdo.c */
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extern unsigned int SingleCPDO(struct roundingData *roundData,
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const unsigned int opcode, FPREG * rFd);
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/* double_cpdo.c */
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extern unsigned int DoubleCPDO(struct roundingData *roundData,
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const unsigned int opcode, FPREG * rFd);
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/* extneded_cpdo.c */
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extern unsigned int ExtendedCPDO(struct roundingData *roundData,
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const unsigned int opcode, FPREG * rFd);
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#endif
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