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 "cpu.h" 25 26 #define GET_FPA11() (qemufpa) 27 28 /* 29 * The processes registers are always at the very top of the 8K 30 * stack+task struct. Use the same method as 'current' uses to 31 * reach them. 32 */ 33 extern CPUARMState *user_registers; 34 35 #define GET_USERREG() (user_registers) 36 37 /* Need task_struct */ 38 //#include <linux/sched.h> 39 40 /* includes */ 41 #include "fpsr.h" /* FP control and status register definitions */ 42 #include "fpu/softfloat.h" 43 44 #define typeNone 0x00 45 #define typeSingle 0x01 46 #define typeDouble 0x02 47 #define typeExtended 0x03 48 49 /* 50 * This must be no more and no less than 12 bytes. 51 */ 52 typedef union tagFPREG { 53 floatx80 fExtended; 54 float64 fDouble; 55 float32 fSingle; 56 } FPREG; 57 58 /* 59 * FPA11 device model. 60 * 61 * This structure is exported to user space. Do not re-order. 62 * Only add new stuff to the end, and do not change the size of 63 * any element. Elements of this structure are used by user 64 * space, and must match struct user_fp in include/asm-arm/user.h. 65 * We include the byte offsets below for documentation purposes. 66 * 67 * The size of this structure and FPREG are checked by fpmodule.c 68 * on initialisation. If the rules have been broken, NWFPE will 69 * not initialise. 70 */ 71 typedef struct tagFPA11 { 72 /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */ 73 /* 96 */ FPSR fpsr; /* floating point status register */ 74 /* 100 */ FPCR fpcr; /* floating point control register */ 75 /* 104 */ unsigned char fType[8]; /* type of floating point value held in 76 floating point registers. One of none 77 single, double or extended. */ 78 /* 112 */ int initflag; /* this is special. The kernel guarantees 79 to set it to 0 when a thread is launched, 80 so we can use it to detect whether this 81 instance of the emulator needs to be 82 initialised. */ 83 float_status fp_status; /* QEMU float emulator status */ 84 } FPA11; 85 86 extern FPA11* qemufpa; 87 88 void resetFPA11(void); 89 void SetRoundingMode(const unsigned int); 90 void SetRoundingPrecision(const unsigned int); 91 92 static inline unsigned int readRegister(unsigned int reg) 93 { 94 return (user_registers->regs[(reg)]); 95 } 96 97 static inline void writeRegister(unsigned int x, unsigned int y) 98 { 99 #if 0 100 printf("writing %d to r%d\n",y,x); 101 #endif 102 user_registers->regs[(x)]=(y); 103 } 104 105 static inline void writeConditionCodes(unsigned int x) 106 { 107 cpsr_write(user_registers, x, CPSR_NZCV, CPSRWriteByInstr); 108 } 109 110 #define ARM_REG_PC 15 111 112 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs); 113 114 unsigned int EmulateCPDO(const unsigned int); 115 unsigned int EmulateCPDT(const unsigned int); 116 unsigned int EmulateCPRT(const unsigned int); 117 118 unsigned int SingleCPDO(const unsigned int opcode); 119 unsigned int DoubleCPDO(const unsigned int opcode); 120 unsigned int ExtendedCPDO(const unsigned int opcode); 121 122 123 /* included only for get_user/put_user macros */ 124 #include "qemu.h" 125 126 #endif 127