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