110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
NetWinder Floating Point Emulator
|
|
(c) Rebel.com, 1998-1999
|
|
|
|
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
|
|
|
|
*/
|
|
|
|
#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
|