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  */
  34 extern 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  */
  53 typedef 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  */
  72 typedef 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
  87 extern FPA11* qemufpa;
  88
  89 void resetFPA11(void);
  90 void SetRoundingMode(const unsigned int);
  91 void SetRoundingPrecision(const unsigned int);
  92
  93 static inline unsigned int readRegister(unsigned int reg)
  94 {
  95     return (user_registers->regs[(reg)]);
  96 }
  97
  98 static 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
 106 static 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
 113 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs);
 114
 115 unsigned int EmulateCPDO(const unsigned int);
 116 unsigned int EmulateCPDT(const unsigned int);
 117 unsigned int EmulateCPRT(const unsigned int);
 118
 119 unsigned int SingleCPDO(const unsigned int opcode);
 120 unsigned int DoubleCPDO(const unsigned int opcode);
 121 unsigned int ExtendedCPDO(const unsigned int opcode);
 122
 123
 124 /* included only for get_user/put_user macros */
 125 #include "qemu.h"
 126
 127 #endif