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 "fpu/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 131