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
  25#include <cpu.h>
  26
  27#define GET_FPA11() (qemufpa)
  28
  29/*
  30 * The processes registers are always at the very top of the 8K
  31 * stack+task struct.  Use the same method as 'current' uses to
  32 * reach them.
  33 */
  34extern CPUARMState *user_registers;
  35
  36#define GET_USERREG() (user_registers)
  37
  38/* Need task_struct */
  39//#include <linux/sched.h>
  40
  41/* includes */
  42#include "fpsr.h"               /* FP control and status register definitions */
  43#include "fpu/softfloat.h"
  44
  45#define         typeNone                0x00
  46#define         typeSingle              0x01
  47#define         typeDouble              0x02
  48#define         typeExtended            0x03
  49
  50/*
  51 * This must be no more and no less than 12 bytes.
  52 */
  53typedef union tagFPREG {
  54   floatx80 fExtended;
  55   float64  fDouble;
  56   float32  fSingle;
  57} FPREG;
  58
  59/*
  60 * FPA11 device model.
  61 *
  62 * This structure is exported to user space.  Do not re-order.
  63 * Only add new stuff to the end, and do not change the size of
  64 * any element.  Elements of this structure are used by user
  65 * space, and must match struct user_fp in include/asm-arm/user.h.
  66 * We include the byte offsets below for documentation purposes.
  67 *
  68 * The size of this structure and FPREG are checked by fpmodule.c
  69 * on initialisation.  If the rules have been broken, NWFPE will
  70 * not initialise.
  71 */
  72typedef struct tagFPA11 {
  73/*   0 */  FPREG fpreg[8];              /* 8 floating point registers */
  74/*  96 */  FPSR fpsr;                   /* floating point status register */
  75/* 100 */  FPCR fpcr;                   /* floating point control register */
  76/* 104 */  unsigned char fType[8];      /* type of floating point value held in
  77                                           floating point registers.  One of none
  78                                           single, double or extended. */
  79/* 112 */  int initflag;                /* this is special.  The kernel guarantees
  80                                           to set it to 0 when a thread is launched,
  81                                           so we can use it to detect whether this
  82                                           instance of the emulator needs to be
  83                                           initialised. */
  84    float_status fp_status;      /* QEMU float emulator status */
  85} FPA11;
  86
  87extern FPA11* qemufpa;
  88
  89void resetFPA11(void);
  90void SetRoundingMode(const unsigned int);
  91void SetRoundingPrecision(const unsigned int);
  92
  93static inline unsigned int readRegister(unsigned int reg)
  94{
  95    return (user_registers->regs[(reg)]);
  96}
  97
  98static inline void writeRegister(unsigned int x, unsigned int y)
  99{
 100#if 0
 101        printf("writing %d to r%d\n",y,x);
 102#endif
 103        user_registers->regs[(x)]=(y);
 104}
 105
 106static inline void writeConditionCodes(unsigned int x)
 107{
 108    cpsr_write(user_registers, x, CPSR_NZCV, CPSRWriteByInstr);
 109}
 110
 111#define ARM_REG_PC 15
 112
 113unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
 114
 115unsigned int EmulateCPDO(const unsigned int);
 116unsigned int EmulateCPDT(const unsigned int);
 117unsigned int EmulateCPRT(const unsigned int);
 118
 119unsigned int SingleCPDO(const unsigned int opcode);
 120unsigned int DoubleCPDO(const unsigned int opcode);
 121unsigned int ExtendedCPDO(const unsigned int opcode);
 122
 123
 124/* included only for get_user/put_user macros */
 125#include "qemu.h"
 126
 127#endif
 128