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 123