LXR qemu/linux-user/arm/nwfpe/fpa11.h

   1/*
   2    NetWinder Floating Point Emulator
   3    (c) Rebel.com, 1998-1999
   4
   5    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, see <http://www.gnu.org/licenses/>.
  19*/
  20
  21#ifndef __FPA11_H__
  22#define __FPA11_H__
  23
  24#include <stdlib.h>
  25#include <stdio.h>
  26#include <errno.h>
  27
  28#include <cpu.h>
  29
  30#define GET_FPA11() (qemufpa)
  31
  32/*
  33 * The processes registers are always at the very top of the 8K
  34 * stack+task struct.  Use the same method as 'current' uses to
  35 * reach them.
  36 */
  37extern CPUARMState *user_registers;
  38
  39#define GET_USERREG() (user_registers)
  40
  41/* Need task_struct */
  42//#include <linux/sched.h>
  43
  44/* includes */
  45#include "fpsr.h"               /* FP control and status register definitions */
  46#include "fpu/softfloat.h"
  47
  48#define         typeNone                0x00
  49#define         typeSingle              0x01
  50#define         typeDouble              0x02
  51#define         typeExtended            0x03
  52
  53/*
  54 * This must be no more and no less than 12 bytes.
  55 */
  56typedef union tagFPREG {
  57   floatx80 fExtended;
  58   float64  fDouble;
  59   float32  fSingle;
  60} FPREG;
  61
  62/*
  63 * FPA11 device model.
  64 *
  65 * This structure is exported to user space.  Do not re-order.
  66 * Only add new stuff to the end, and do not change the size of
  67 * any element.  Elements of this structure are used by user
  68 * space, and must match struct user_fp in include/asm-arm/user.h.
  69 * We include the byte offsets below for documentation purposes.
  70 *
  71 * The size of this structure and FPREG are checked by fpmodule.c
  72 * on initialisation.  If the rules have been broken, NWFPE will
  73 * not initialise.
  74 */
  75typedef struct tagFPA11 {
  76/*   0 */  FPREG fpreg[8];              /* 8 floating point registers */
  77/*  96 */  FPSR fpsr;                   /* floating point status register */
  78/* 100 */  FPCR fpcr;                   /* floating point control register */
  79/* 104 */  unsigned char fType[8];      /* type of floating point value held in
  80                                           floating point registers.  One of none
  81                                           single, double or extended. */
  82/* 112 */  int initflag;                /* this is special.  The kernel guarantees
  83                                           to set it to 0 when a thread is launched,
  84                                           so we can use it to detect whether this
  85                                           instance of the emulator needs to be
  86                                           initialised. */
  87    float_status fp_status;      /* QEMU float emulator status */
  88} FPA11;
  89
  90extern FPA11* qemufpa;
  91
  92void resetFPA11(void);
  93void SetRoundingMode(const unsigned int);
  94void SetRoundingPrecision(const unsigned int);
  95
  96static inline unsigned int readRegister(unsigned int reg)
  97{
  98    return (user_registers->regs[(reg)]);
  99}
 100
 101static inline void writeRegister(unsigned int x, unsigned int y)
 102{
 103#if 0
 104        printf("writing %d to r%d\n",y,x);
 105#endif
 106        user_registers->regs[(x)]=(y);
 107}
 108
 109static inline void writeConditionCodes(unsigned int x)
 110{
 111        cpsr_write(user_registers,x,CPSR_NZCV);
 112}
 113
 114#define ARM_REG_PC 15
 115
 116unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
 117
 118unsigned int EmulateCPDO(const unsigned int);
 119unsigned int EmulateCPDT(const unsigned int);
 120unsigned int EmulateCPRT(const unsigned int);
 121
 122unsigned int SingleCPDO(const unsigned int opcode);
 123unsigned int DoubleCPDO(const unsigned int opcode);
 124unsigned int ExtendedCPDO(const unsigned int opcode);
 125
 126
 127/* included only for get_user/put_user macros */
 128#include "qemu.h"
 129
 130#endif
 131