/* NetWinder Floating Point Emulator (c) Rebel.com, 1998-1999 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ #ifndef FPA11_H #define FPA11_H #include "cpu.h" #define GET_FPA11() (qemufpa) /* * The processes registers are always at the very top of the 8K * stack+task struct. Use the same method as 'current' uses to * reach them. */ extern CPUARMState *user_registers; #define GET_USERREG() (user_registers) /* Need task_struct */ //#include <linux/sched.h> /* includes */ #include "fpsr.h" /* FP control and status register definitions */ #include "fpu/softfloat.h" #define typeNone 0x00 #define typeSingle 0x01 #define typeDouble 0x02 #define typeExtended 0x03 /* * This must be no more and no less than 12 bytes. */ typedef union tagFPREG { floatx80 fExtended; float64 fDouble; float32 fSingle; } FPREG; /* * FPA11 device model. * * This structure is exported to user space. Do not re-order. * Only add new stuff to the end, and do not change the size of * any element. Elements of this structure are used by user * space, and must match struct user_fp in include/asm-arm/user.h. * We include the byte offsets below for documentation purposes. * * The size of this structure and FPREG are checked by fpmodule.c * on initialisation. If the rules have been broken, NWFPE will * not initialise. */ typedef struct tagFPA11 { /* 0 */ FPREG fpreg[8]; /* 8 floating point registers */ /* 96 */ FPSR fpsr; /* floating point status register */ /* 100 */ FPCR fpcr; /* floating point control register */ /* 104 */ unsigned char fType[8]; /* type of floating point value held in floating point registers. One of none single, double or extended. */ /* 112 */ int initflag; /* this is special. The kernel guarantees to set it to 0 when a thread is launched, so we can use it to detect whether this instance of the emulator needs to be initialised. */ float_status fp_status; /* QEMU float emulator status */ } FPA11; extern FPA11* qemufpa; void resetFPA11(void); void SetRoundingMode(const unsigned int); void SetRoundingPrecision(const unsigned int); static inline unsigned int readRegister(unsigned int reg) { return (user_registers->regs[(reg)]); } static inline void writeRegister(unsigned int x, unsigned int y) { #if 0 printf("writing %d to r%d\n",y,x); #endif user_registers->regs[(x)]=(y); } static inline void writeConditionCodes(unsigned int x) { cpsr_write(user_registers, x, CPSR_NZCV, CPSRWriteByInstr); } #define ARM_REG_PC 15 unsigned int EmulateAll(unsigned int opcode, FPA11* qfpa, CPUARMState* qregs); unsigned int EmulateCPDO(const unsigned int); unsigned int EmulateCPDT(const unsigned int); unsigned int EmulateCPRT(const unsigned int); unsigned int SingleCPDO(const unsigned int opcode); unsigned int DoubleCPDO(const unsigned int opcode); unsigned int ExtendedCPDO(const unsigned int opcode); /* included only for get_user/put_user macros */ #include "qemu.h" #endif