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 128