target-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, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #ifndef __FPA11_H__
  23 #define __FPA11_H__
  24
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <errno.h>
  28
  29 #include <cpu.h>
  30
  31 #define GET_FPA11() (qemufpa)
  32
  33 /*
  34  * The processes registers are always at the very top of the 8K
  35  * stack+task struct.  Use the same method as 'current' uses to
  36  * reach them.
  37  */
  38 extern CPUARMState *user_registers;
  39
  40 #define GET_USERREG() (user_registers)
  41
  42 /* Need task_struct */
  43 //#include <linux/sched.h>
  44
  45 /* includes */
  46 #include "fpsr.h"               /* FP control and status register definitions */
  47 #include "softfloat.h"
  48
  49 #define         typeNone                0x00
  50 #define         typeSingle              0x01
  51 #define         typeDouble              0x02
  52 #define         typeExtended            0x03
  53
  54 /*
  55  * This must be no more and no less than 12 bytes.
  56  */
  57 typedef union tagFPREG {
  58    floatx80 fExtended;
  59    float64  fDouble;
  60    float32  fSingle;
  61 } FPREG;
  62
  63 /*
  64  * FPA11 device model.
  65  *
  66  * This structure is exported to user space.  Do not re-order.
  67  * Only add new stuff to the end, and do not change the size of
  68  * any element.  Elements of this structure are used by user
  69  * space, and must match struct user_fp in include/asm-arm/user.h.
  70  * We include the byte offsets below for documentation purposes.
  71  *
  72  * The size of this structure and FPREG are checked by fpmodule.c
  73  * on initialisation.  If the rules have been broken, NWFPE will
  74  * not initialise.
  75  */
  76 typedef struct tagFPA11 {
  77 /*   0 */  FPREG fpreg[8];              /* 8 floating point registers */
  78 /*  96 */  FPSR fpsr;                   /* floating point status register */
  79 /* 100 */  FPCR fpcr;                   /* floating point control register */
  80 /* 104 */  unsigned char fType[8];      /* type of floating point value held in
  81                                            floating point registers.  One of none
  82                                            single, double or extended. */
  83 /* 112 */  int initflag;                /* this is special.  The kernel guarantees
  84                                            to set it to 0 when a thread is launched,
  85                                            so we can use it to detect whether this
  86                                            instance of the emulator needs to be
  87                                            initialised. */
  88     float_status fp_status;      /* QEMU float emulator status */
  89 } FPA11;
  90
  91 extern FPA11* qemufpa;
  92
  93 extern void resetFPA11(void);
  94 extern void SetRoundingMode(const unsigned int);
  95 extern void SetRoundingPrecision(const unsigned int);
  96
  97 static inline unsigned int readRegister(unsigned int reg)
  98 {
  99     return (user_registers->regs[(reg)]);
 100 }
 101
 102 static inline void writeRegister(unsigned int x, unsigned int y)
 103 {
 104 #if 0
 105         printf("writing %d to r%d\n",y,x);
 106 #endif
 107         user_registers->regs[(x)]=(y);
 108 }
 109
 110 static inline void writeConditionCodes(unsigned int x)
 111 {
 112         cpsr_write(user_registers,x,CPSR_NZCV);
 113 }
 114
 115 #define REG_PC 15
 116
 117 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
 118
 119 /* included only for get_user/put_user macros */
 120 #include "qemu.h"
 121
 122 #endif