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  */
  37 extern 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 "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  */
  56 typedef 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  */
  75 typedef 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
  90 extern FPA11* qemufpa;
  91
  92 void resetFPA11(void);
  93 void SetRoundingMode(const unsigned int);
  94 void SetRoundingPrecision(const unsigned int);
  95
  96 static inline unsigned int readRegister(unsigned int reg)
  97 {
  98     return (user_registers->regs[(reg)]);
  99 }
 100
 101 static 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
 109 static inline void writeConditionCodes(unsigned int x)
 110 {
 111         cpsr_write(user_registers,x,CPSR_NZCV);
 112 }
 113
 114 #define ARM_REG_PC 15
 115
 116 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
 117
 118 unsigned int EmulateCPDO(const unsigned int);
 119 unsigned int EmulateCPDT(const unsigned int);
 120 unsigned int EmulateCPRT(const unsigned int);
 121
 122 unsigned int SingleCPDO(const unsigned int opcode);
 123 unsigned int DoubleCPDO(const unsigned int opcode);
 124 unsigned int ExtendedCPDO(const unsigned int opcode);
 125
 126
 127 /* included only for get_user/put_user macros */
 128 #include "qemu.h"
 129
 130 #endif