?? i_sub.c
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/**********************************//* *//* Copyright 2000, David Grant *//* *//* see LICENSE for more details *//* *//**********************************/#include "coldfire.h"/* Subtract instruction *//* Format 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+| 1 | 0 | 0 | 1 | Register | OPmode | EA Mode |EA Register|+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+*/int SUBTime[2][8]={{1, 3, 3, 3, 3, 4, 3, 1 }, {-1, 3, 3, 3, 3, 4, 3, -1 }};INSTRUCTION_5ARGS(SUB, unsigned Code1,4, unsigned Register,3, unsigned OPMode,3, unsigned EAMode,3, unsigned EARegister,3);static void execute(void){ struct _Address Source,Destination; unsigned int Result, SValue, DValue; SUB_Instr Instr; Memory_RetrWordFromPC(&Instr.Code);/* printf("SUB: Register=%d, OPMode=%d, EAMode=%d, EARegister=%d\n", Register, OPMode, EAMode,EARegister);*/ if(Instr.Bits.OPMode==2) { /* <EA>y + Dx */ if(!EA_GetFromPC(&Source, 32, Instr.Bits.EAMode, Instr.Bits.EARegister)) return; if(!EA_GetFromPC(&Destination, 32, 0, Instr.Bits.Register)) return; } else if(Instr.Bits.OPMode==6) { /* Dy + <EA>x -> <EA>x */ if(Instr.Bits.EAMode==0) { ERR("May not specify Dx for destination when source is Dx"); return; } else if(Instr.Bits.EAMode==1) { ERR("May not specify Ax for destination when source is Dx"); return; } if(!EA_GetFromPC(&Source, 32, 0, Instr.Bits.Register)) return; if(!EA_GetFromPC(&Destination, 32, Instr.Bits.EAMode, Instr.Bits.EARegister)) return; } else { ERR("Unknown opcode %x\n", Instr.Bits.OPMode); return; } EA_GetValue(&SValue, &Source); EA_GetValue(&DValue, &Destination); Result = DValue - SValue; /* Set the status register */ SR_Set(I_SUB, SValue, DValue, Result); EA_PutValue(&Destination, Result); if(Instr.Bits.OPMode==2) /* <EA>y + Dx */ cycle(SUBTime[0][cycle_EA(Instr.Bits.EARegister,Instr.Bits.EAMode)]); else cycle(SUBTime[1][cycle_EA(Instr.Bits.EARegister,Instr.Bits.EAMode)]); return;}static int disassemble(char *Instruction, char *Arg1, char *Arg2){ SUB_Instr Instr; Memory_RetrWordFromPC(&Instr.Code); sprintf(Instruction, "SUB.L"); if(Instr.Bits.OPMode==2) { /* <EA>y & Dx */ Addressing_Print(32, Instr.Bits.EAMode, Instr.Bits.EARegister, Arg1); Addressing_Print(32, 0, Instr.Bits.Register, Arg2); } else { Addressing_Print(32, 0, Instr.Bits.Register, Arg1); Addressing_Print(32, Instr.Bits.EAMode, Instr.Bits.EARegister, Arg2); } return 0;}int sub_5206_register(void){ instruction_register(0x9000, 0xF000, &execute, &disassemble); return 1;}
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