831 lines
21 KiB
C++
831 lines
21 KiB
C++
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// This file is part of the Cyclone 68000 Emulator
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// Copyright (c) 2004,2011 FinalDave (emudave (at) gmail.com)
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// Copyright (c) 2005-2011 Gražvydas "notaz" Ignotas (notasas (at) gmail.com)
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// This code is licensed under the GNU General Public License version 2.0 and the MAME License.
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// You can choose the license that has the most advantages for you.
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// SVN repository can be found at http://code.google.com/p/cyclone68000/
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#include "app.h"
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// --------------------- Opcodes 0x0000+ ---------------------
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// Emit an Ori/And/Sub/Add/Eor/Cmp Immediate opcode, 0000ttt0 ssaaaaaa
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int OpArith(int op)
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{
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int type=0,size=0;
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int sea=0,tea=0;
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int use=0;
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const char *shiftstr="";
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// Get source and target EA
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type=(op>>9)&7; if (type==4 || type>=7) return 1;
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size=(op>>6)&3; if (size>=3) return 1;
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sea= 0x003c;
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tea=op&0x003f;
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// See if we can do this opcode:
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if (EaCanRead(tea,size)==0) return 1;
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if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;
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use=OpBase(op,size);
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op, sea, tea); Cycles=4;
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// imm must be read first
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EaCalcReadNoSE(-1,10,sea,size,0);
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EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);
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if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");
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if (size<2) ot(" mov r10,r10,asl #%i\n",size?16:24);
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ot(";@ Do arithmetic:\n");
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if (type==0) ot(" orr r1,r10,r0%s\n",shiftstr);
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if (type==1) ot(" and r1,r10,r0%s\n",shiftstr);
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if (type==2||type==6)
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ot(" rsbs r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);
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if (type==3) ot(" adds r1,r10,r0%s ;@ Defines NZCV\n",shiftstr);
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if (type==5) ot(" eor r1,r10,r0%s\n",shiftstr);
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if (type<2 || type==5) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n"); // 0,1,5
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if (type< 2) OpGetFlags(0,0); // Ori/And
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if (type==2) OpGetFlags(1,1); // Sub: Subtract/X-bit
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if (type==3) OpGetFlags(0,1); // Add: X-bit
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if (type==5) OpGetFlags(0,0); // Eor
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if (type==6) OpGetFlags(1,0); // Cmp: Subtract
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ot("\n");
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if (type!=6)
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{
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EaWrite(11, 1, tea,size,0x003f,1);
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}
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// Correct cycles:
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if (type==6)
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{
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if (size>=2 && tea<0x10) Cycles+=2;
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}
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else
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{
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if (size>=2) Cycles+=4;
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if (tea>=8) Cycles+=4;
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if (type==1 && size>=2 && tea<8) Cycles-=2;
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}
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OpEnd(sea,tea);
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return 0;
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}
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// --------------------- Opcodes 0x5000+ ---------------------
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int OpAddq(int op)
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{
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// 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)
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int num=0,type=0,size=0,ea=0;
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int use=0;
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char count[16]="";
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int shift=0;
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num =(op>>9)&7; if (num==0) num=8;
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type=(op>>8)&1;
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size=(op>>6)&3; if (size>=3) return 1;
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ea = op&0x3f;
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// See if we can do this opcode:
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if (EaCanRead (ea,size)==0) return 1;
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if (EaCanWrite(ea) ==0) return 1;
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if (size == 0 && EaAn(ea) ) return 1;
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use=OpBase(op,size,1);
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if (num!=8) use|=0x0e00; // If num is not 8, use same handler
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,ea);
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Cycles=ea<8?4:8;
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if(type==0&&size==1) Cycles=ea<0x10?4:8;
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if(size>=2) Cycles=ea<0x10?8:12;
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if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit
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EaCalcReadNoSE(11,0,ea,size,0x003f);
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shift=32-(8<<size);
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if (num!=8)
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{
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int lsr=9-shift;
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ot(" and r2,r8,#0x0e00 ;@ Get quick value\n");
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if (lsr>=0) sprintf(count,"r2,lsr #%d", lsr);
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else sprintf(count,"r2,lsl #%d", -lsr);
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ot("\n");
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}
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else
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{
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sprintf(count,"#0x%.4x",8<<shift);
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}
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if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
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if (type==0) ot(" adds r1,r0,%s\n",count);
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if (type==1) ot(" subs r1,r0,%s\n",count);
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if ((ea&0x38)!=0x08) OpGetFlags(type,1);
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ot("\n");
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EaWrite(11, 1, ea,size,0x003f,1);
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OpEnd(ea);
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return 0;
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}
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// --------------------- Opcodes 0x8000+ ---------------------
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// 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)
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int OpArithReg(int op)
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{
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int use=0;
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int type=0,size=0,dir=0,rea=0,ea=0;
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const char *asl="";
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const char *strop=0;
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type=(op>>12)&5;
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rea =(op>> 9)&7;
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dir =(op>> 8)&1; // er,re
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size=(op>> 6)&3; if (size>=3) return 1;
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ea = op&0x3f;
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if (dir && ea<0x10) return 1; // addx/subx opcode
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// See if we can do this opcode:
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if (dir==0 && EaCanRead (ea,size)==0) return 1;
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if (dir && EaCanWrite(ea)==0) return 1;
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if ((size==0||!(type&1))&&EaAn(ea)) return 1;
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use=OpBase(op,size);
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use&=~0x0e00; // Use same opcode for Dn
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,ea); Cycles=4;
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EaCalcReadNoSE(dir?11:-1,0,ea,size,0x003f);
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EaCalcReadNoSE(dir?-1:11,1,rea,size,0x0e00);
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ot(";@ Do arithmetic:\n");
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if (type==0) strop = "orr";
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if (type==1) strop = (char *) (dir ? "subs" : "rsbs");
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if (type==4) strop = "and";
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if (type==5) strop = "adds";
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if (size==0) asl=",asl #24";
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if (size==1) asl=",asl #16";
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if (size<2) ot(" mov r0,r0%s\n",asl);
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ot(" %s r1,r0,r1%s\n",strop,asl);
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if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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OpGetFlags(type==1,type&1); // 1==subtract
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ot("\n");
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ot(";@ Save result:\n");
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if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);
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if (dir) EaWrite(11, 1, ea,size,0x003f,0,0);
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else EaWrite(11, 1,rea,size,0x0e00,0,0);
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if(rea==ea) {
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if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;
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} else if(dir) {
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Cycles+=4;
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if(size>=2) Cycles+=4;
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} else {
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if(size>=2) {
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Cycles+=2;
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if(ea<0x10||ea==0x3c) Cycles+=2;
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}
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}
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OpEnd(ea);
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return 0;
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}
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// --------------------- Opcodes 0x80c0+ ---------------------
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int OpMul(int op)
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{
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// Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)
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int type=0,rea=0,sign=0,ea=0;
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int use=0;
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type=(op>>14)&1; // div/mul
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rea =(op>> 9)&7;
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sign=(op>> 8)&1;
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ea = op&0x3f;
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// See if we can do this opcode:
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if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;
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use=OpBase(op,1);
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use&=~0x0e00; // Use same for all registers
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,ea);
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if(type) Cycles=54;
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else Cycles=sign?158:140;
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EaCalcReadNoSE(-1,0,ea,1,0x003f);
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EaCalc(11,0x0e00,rea, 2);
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EaRead(11, 2,rea, 2,0x0e00);
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ot(" movs r1,r0,asl #16\n");
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if (type==0) // div
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{
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// the manual says C is always cleared, but neither Musashi nor FAME do that
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//ot(" bic r10,r10,#0x20000000 ;@ always clear C\n");
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ot(" beq divzero%.4x ;@ division by zero\n",op);
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ot("\n");
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if (sign)
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{
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ot(" mov r12,#0 ;@ r12 = 1 or 2 if the result is negative\n");
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ot(" tst r2,r2\n");
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ot(" orrmi r12,r12,#2\n");
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ot(" rsbmi r2,r2,#0 ;@ Make r2 positive\n");
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ot("\n");
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ot(" movs r0,r1,asr #16\n");
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ot(" orrmi r12,r12,#1\n");
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ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");
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ot("\n");
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ot(";@ detect the nasty 0x80000000 / -1 situation\n");
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ot(" mov r3,r2,asr #31\n");
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ot(" eors r3,r3,r1,asr #16\n");
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ot(" beq wrendofop%.4x\n",op);
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}
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else
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{
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ot(" mov r0,r1,lsr #16 ;@ use only 16 bits of divisor\n");
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}
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ot("\n");
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ot(";@ Divide r2 by r0\n");
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ot(" mov r3,#0\n");
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ot(" mov r1,r0\n");
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ot("\n");
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ot(";@ Shift up divisor till it's just less than numerator\n");
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ot("Shift%.4x%s\n",op,ms?"":":");
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ot(" cmp r1,r2,lsr #1\n");
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ot(" movls r1,r1,lsl #1\n");
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ot(" bcc Shift%.4x\n",op);
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ot("\n");
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ot("Divide%.4x%s\n",op,ms?"":":");
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ot(" cmp r2,r1\n");
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ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");
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ot(" subcs r2,r2,r1\n");
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ot(" teq r1,r0\n");
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ot(" movne r1,r1,lsr #1\n");
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ot(" bne Divide%.4x\n",op);
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ot("\n");
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ot(";@r3==quotient,r2==remainder\n");
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if (sign)
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{
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// sign correction
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ot(" and r1,r12,#1\n");
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ot(" teq r1,r12,lsr #1\n");
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ot(" rsbne r3,r3,#0 ;@ negate if quotient is negative\n");
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ot(" tst r12,#2\n");
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ot(" rsbne r2,r2,#0 ;@ negate the remainder if divident was negative\n");
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ot("\n");
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// signed overflow check
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ot(" mov r1,r3,asl #16\n");
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ot(" cmp r3,r1,asr #16 ;@ signed overflow?\n");
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ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");
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ot(" bne endofop%.4x ;@ overflow!\n",op);
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ot("\n");
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ot("wrendofop%.4x%s\n",op,ms?"":":");
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}
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else
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{
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// overflow check
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ot(" movs r1,r3,lsr #16 ;@ check for overflow condition\n");
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ot(" orrne r10,r10,#0x10000000 ;@ set overflow flag\n");
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ot(" bne endofop%.4x ;@ overflow!\n",op);
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ot("\n");
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}
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ot(" mov r1,r3,lsl #16 ;@ Clip to 16-bits\n");
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ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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OpGetFlags(0,0);
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ot(" mov r1,r1,lsr #16\n");
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ot(" orr r1,r1,r2,lsl #16 ;@ Insert remainder\n");
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}
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if (type==1)
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{
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ot(";@ Get 16-bit signs right:\n");
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ot(" mov r0,r1,%s #16\n",sign?"asr":"lsr");
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ot(" mov r2,r2,lsl #16\n");
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ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");
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ot("\n");
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ot(" mul r1,r2,r0\n");
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ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
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OpGetFlags(0,0);
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}
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ot("\n");
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EaWrite(11, 1,rea, 2,0x0e00,1);
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if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");
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OpEnd(ea);
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if (type==0) // div
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{
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ot("divzero%.4x%s\n",op,ms?"":":");
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ot(" mov r0,#5 ;@ Divide by zero\n");
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ot(" bl Exception\n");
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Cycles+=38;
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OpEnd(ea);
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ot("\n");
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}
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return 0;
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}
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// Get X Bit into carry - trashes r2
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int GetXBit(int subtract)
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{
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ot(";@ Get X bit:\n");
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ot(" ldr r2,[r7,#0x4c]\n");
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if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");
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ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");
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ot("\n");
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return 0;
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}
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// --------------------- Opcodes 0x8100+ ---------------------
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// 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)
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int OpAbcd(int op)
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{
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int use=0;
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int type=0,sea=0,mem=0,dea=0;
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type=(op>>14)&1; // sbcd/abcd
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dea =(op>> 9)&7;
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mem =(op>> 3)&1;
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sea = op &7;
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if (mem) { sea|=0x20; dea|=0x20; }
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use=op&~0x0e07; // Use same opcode for all registers..
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if (sea==0x27) use|=0x0007; // ___x.b -(a7)
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if (dea==0x27) use|=0x0e00; // ___x.b -(a7)
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if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
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OpStart(op,sea,dea); Cycles=6;
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if (mem)
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{
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ot(";@ Get src/dest EA vals\n");
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EaCalc (0,0x000f, sea,0,1);
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EaRead (0, 6, sea,0,0x000f,1);
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EaCalcReadNoSE(11,0,dea,0,0x0e00);
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}
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else
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{
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ot(";@ Get src/dest reg vals\n");
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EaCalcReadNoSE(-1,6,sea,0,0x0007);
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EaCalcReadNoSE(11,0,dea,0,0x0e00);
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ot(" mov r6,r6,asl #24\n");
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}
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ot(" mov r1,r0,asl #24\n\n");
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ot(" bic r10,r10,#0xb1000000 ;@ clear all flags except old Z\n");
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if (type)
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{
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ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
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ot(" mov r3,#0x00f00000\n");
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ot(" and r2,r3,r1,lsr #4\n");
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ot(" tst r0,#0x20000000\n");
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ot(" and r0,r3,r6,lsr #4\n");
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ot(" add r0,r0,r2\n");
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ot(" addne r0,r0,#0x00100000\n");
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// ot(" tst r0,#0x00800000\n");
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// ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");
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ot(" cmp r0,#0x00900000\n");
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ot(" addhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");
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ot(" mov r2,r1,lsr #28\n");
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ot(" add r0,r0,r2,lsl #24\n");
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ot(" mov r2,r6,lsr #28\n");
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ot(" add r0,r0,r2,lsl #24\n");
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ot(" cmp r0,#0x09900000\n");
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ot(" orrhi r10,r10,#0x20000000 ;@ C\n");
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ot(" subhi r0,r0,#0x0a000000\n");
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// ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");
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// ot(" orr r10,r10,r3,lsl #4 ;@ V\n");
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ot(" movs r0,r0,lsl #4\n");
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ot(" orrmi r10,r10,#0x90000000 ;@ Undefined N+V behavior\n"); // this is what Musashi really does
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ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");
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}
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else
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{
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ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
|
|
ot(" mov r3,#0x00f00000\n");
|
|
ot(" and r2,r3,r6,lsr #4\n");
|
|
ot(" tst r0,#0x20000000\n");
|
|
ot(" and r0,r3,r1,lsr #4\n");
|
|
ot(" sub r0,r0,r2\n");
|
|
ot(" subne r0,r0,#0x00100000\n");
|
|
// ot(" tst r0,#0x00800000\n");
|
|
// ot(" orreq r10,r10,#0x01000000 ;@ Undefined V behavior\n");
|
|
ot(" cmp r0,#0x00900000\n");
|
|
ot(" subhi r0,r0,#0x00600000 ;@ Decimal adjust units\n");
|
|
|
|
ot(" mov r2,r1,lsr #28\n");
|
|
ot(" add r0,r0,r2,lsl #24\n");
|
|
ot(" mov r2,r6,lsr #28\n");
|
|
ot(" sub r0,r0,r2,lsl #24\n");
|
|
ot(" cmp r0,#0x09900000\n");
|
|
ot(" orrhi r10,r10,#0xa0000000 ;@ N and C\n");
|
|
ot(" addhi r0,r0,#0x0a000000\n");
|
|
// ot(" and r3,r10,r0,lsr #3 ;@ Undefined V behavior part II\n");
|
|
// ot(" orr r10,r10,r3,lsl #4 ;@ V\n");
|
|
ot(" movs r0,r0,lsl #4\n");
|
|
// ot(" orrmi r10,r10,#0x80000000 ;@ Undefined N behavior\n");
|
|
ot(" bicne r10,r10,#0x40000000 ;@ Z flag\n");
|
|
}
|
|
|
|
ot(" str r10,[r7,#0x4c] ;@ Save X bit\n");
|
|
ot("\n");
|
|
|
|
EaWrite(11, 0, dea,0,0x0e00,1);
|
|
|
|
ot(" ldr r6,[r7,#0x54]\n");
|
|
OpEnd(sea,dea);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// 01001000 00eeeeee - nbcd <ea>
|
|
int OpNbcd(int op)
|
|
{
|
|
int use=0;
|
|
int ea=0;
|
|
|
|
ea=op&0x3f;
|
|
|
|
if(EaCanWrite(ea)==0||EaAn(ea)) return 1;
|
|
|
|
use=OpBase(op,0);
|
|
if(op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,ea); Cycles=6;
|
|
if(ea >= 8) Cycles+=2;
|
|
|
|
EaCalcReadNoSE(6,0,ea,0,0x003f);
|
|
|
|
// this is rewrite of Musashi's code
|
|
ot(" ldr r2,[r7,#0x4c]\n");
|
|
ot(" bic r10,r10,#0xb0000000 ;@ clear all flags, except Z\n");
|
|
ot(" mov r0,r0,asl #24\n");
|
|
ot(" and r2,r2,#0x20000000\n");
|
|
ot(" add r2,r0,r2,lsr #5 ;@ add X\n");
|
|
ot(" rsb r11,r2,#0x9a000000 ;@ do arithmetic\n");
|
|
|
|
ot(" cmp r11,#0x9a000000\n");
|
|
ot(" beq finish%.4x\n",op);
|
|
ot("\n");
|
|
|
|
ot(" mvn r3,r11,lsr #31 ;@ Undefined V behavior\n",op);
|
|
ot(" and r2,r11,#0x0f000000\n");
|
|
ot(" cmp r2,#0x0a000000\n");
|
|
ot(" andeq r11,r11,#0xf0000000\n");
|
|
ot(" addeq r11,r11,#0x10000000\n");
|
|
ot(" and r3,r3,r11,lsr #31 ;@ Undefined V behavior part II\n",op);
|
|
ot(" movs r1,r11,asr #24\n");
|
|
ot(" bicne r10,r10,#0x40000000 ;@ Z\n");
|
|
ot(" orr r10,r10,r3,lsl #28 ;@ save V\n",op);
|
|
ot(" orr r10,r10,#0x20000000 ;@ C\n");
|
|
ot("\n");
|
|
|
|
EaWrite(6, 1, ea,0,0x3f,0,0);
|
|
|
|
ot("finish%.4x%s\n",op,ms?"":":");
|
|
ot(" tst r11,r11\n");
|
|
ot(" orrmi r10,r10,#0x80000000 ;@ N\n");
|
|
ot(" str r10,[r7,#0x4c] ;@ Save X\n");
|
|
ot("\n");
|
|
|
|
ot(" ldr r6,[r7,#0x54]\n");
|
|
OpEnd(ea);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// --------------------- Opcodes 0x90c0+ ---------------------
|
|
// Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)
|
|
int OpAritha(int op)
|
|
{
|
|
int use=0;
|
|
int type=0,size=0,sea=0,dea=0;
|
|
const char *asr="";
|
|
|
|
// Suba/Cmpa/Adda/(invalid):
|
|
type=(op>>13)&3; if (type>=3) return 1;
|
|
|
|
size=(op>>8)&1; size++;
|
|
dea=(op>>9)&7; dea|=8; // Dest=An
|
|
sea=op&0x003f; // Source
|
|
|
|
// See if we can do this opcode:
|
|
if (EaCanRead(sea,size)==0) return 1;
|
|
|
|
use=OpBase(op,size);
|
|
use&=~0x0e00; // Use same opcode for An
|
|
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,sea); Cycles=(size==2)?6:8;
|
|
if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;
|
|
if(type==1) Cycles=6;
|
|
|
|
// EA calculation order defines how situations like suba.w (A0)+, A0 get handled.
|
|
// different emus act differently in this situation, I couldn't fugure which is right behaviour.
|
|
//if (type == 1)
|
|
{
|
|
EaCalcReadNoSE(-1,0,sea,size,0x003f);
|
|
EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);
|
|
}
|
|
#if 0
|
|
else
|
|
{
|
|
EaCalcReadNoSE(type!=1?11:-1,1,dea,2,0x0e00);
|
|
EaCalcReadNoSE(-1,0,sea,size,0x003f);
|
|
}
|
|
#endif
|
|
|
|
if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
|
|
if (size<2) asr=(char *)(size?",asr #16":",asr #24");
|
|
|
|
if (type==0) ot(" sub r1,r1,r0%s\n",asr);
|
|
if (type==1) ot(" cmp r1,r0%s ;@ Defines NZCV\n",asr);
|
|
if (type==1) OpGetFlags(1,0); // Get Cmp flags
|
|
if (type==2) ot(" add r1,r1,r0%s\n",asr);
|
|
ot("\n");
|
|
|
|
if (type!=1) EaWrite(11, 1, dea,2,0x0e00);
|
|
|
|
OpEnd(sea);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// --------------------- Opcodes 0x9100+ ---------------------
|
|
// Emit a Subx/Addx opcode, 1t01ddd1 zz00rsss addx.z Ds,Dd
|
|
int OpAddx(int op)
|
|
{
|
|
int use=0;
|
|
int type=0,size=0,dea=0,sea=0,mem=0;
|
|
const char *asl="";
|
|
|
|
type=(op>>14)&1;
|
|
dea =(op>> 9)&7;
|
|
size=(op>> 6)&3; if (size>=3) return 1;
|
|
sea = op&7;
|
|
mem =(op>> 3)&1;
|
|
|
|
// See if we can do this opcode:
|
|
if (EaCanRead(sea,size)==0) return 1;
|
|
if (EaCanWrite(dea)==0) return 1;
|
|
|
|
if (mem) { sea+=0x20; dea+=0x20; }
|
|
|
|
use=op&~0x0e07; // Use same opcode for Dn
|
|
if (size==0&&sea==0x27) use|=0x0007; // ___x.b -(a7)
|
|
if (size==0&&dea==0x27) use|=0x0e00; // ___x.b -(a7)
|
|
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,sea,dea); Cycles=4;
|
|
if(size>=2) Cycles+=4;
|
|
if(sea>=0x10) Cycles+=2;
|
|
|
|
if (mem)
|
|
{
|
|
ot(";@ Get src/dest EA vals\n");
|
|
EaCalc (0,0x000f, sea,size,1);
|
|
EaRead (0, 6, sea,size,0x000f,1);
|
|
EaCalcReadNoSE(11,0,dea,size,0x0e00);
|
|
}
|
|
else
|
|
{
|
|
ot(";@ Get src/dest reg vals\n");
|
|
EaCalcReadNoSE(-1,6,sea,size,0x0007);
|
|
EaCalcReadNoSE(11,0,dea,size,0x0e00);
|
|
if (size<2) ot(" mov r6,r6,asl #%d\n\n",size?16:24);
|
|
}
|
|
|
|
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
|
|
|
ot(";@ Do arithmetic:\n");
|
|
GetXBit(type==0);
|
|
|
|
if (type==1 && size<2)
|
|
{
|
|
ot(";@ Make sure the carry bit will tip the balance:\n");
|
|
ot(" mvn r2,#0\n");
|
|
ot(" orr r6,r6,r2,lsr #%i\n",(size==0)?8:16);
|
|
ot("\n");
|
|
}
|
|
|
|
if (type==0) ot(" rscs r1,r6,r0%s\n",asl);
|
|
if (type==1) ot(" adcs r1,r6,r0%s\n",asl);
|
|
ot(" orr r3,r10,#0xb0000000 ;@ for old Z\n");
|
|
OpGetFlags(type==0,1,0); // subtract
|
|
if (size<2) {
|
|
ot(" movs r2,r1,lsr #%i\n", size?16:24);
|
|
ot(" orreq r10,r10,#0x40000000 ;@ add potentially missed Z\n");
|
|
}
|
|
ot(" andeq r10,r10,r3 ;@ fix Z\n");
|
|
ot("\n");
|
|
|
|
ot(";@ Save result:\n");
|
|
EaWrite(11, 1, dea,size,0x0e00,1);
|
|
|
|
ot(" ldr r6,[r7,#0x54]\n");
|
|
OpEnd(sea,dea);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// --------------------- Opcodes 0xb000+ ---------------------
|
|
// Emit a Cmp/Eor opcode, 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)
|
|
int OpCmpEor(int op)
|
|
{
|
|
int rea=0,eor=0;
|
|
int size=0,ea=0,use=0;
|
|
const char *asl="";
|
|
|
|
// Get EA and register EA
|
|
rea=(op>>9)&7;
|
|
eor=(op>>8)&1;
|
|
size=(op>>6)&3; if (size>=3) return 1;
|
|
ea=op&0x3f;
|
|
|
|
if (eor && (ea>>3) == 1) return 1; // not a valid mode for eor
|
|
|
|
// See if we can do this opcode:
|
|
if (EaCanRead(ea,size)==0) return 1;
|
|
if (eor && EaCanWrite(ea)==0) return 1;
|
|
if (EaAn(ea)&&(eor||size==0)) return 1;
|
|
|
|
use=OpBase(op,size);
|
|
use&=~0x0e00; // Use 1 handler for register d0-7
|
|
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,ea); Cycles=4;
|
|
if(eor) {
|
|
if(ea>8) Cycles+=4;
|
|
if(size>=2) Cycles+=4;
|
|
} else {
|
|
if(size>=2) Cycles+=2;
|
|
}
|
|
|
|
ot(";@ Get EA into r11 and value into r0:\n");
|
|
EaCalcReadNoSE(eor?11:-1,0,ea,size,0x003f);
|
|
|
|
ot(";@ Get register operand into r1:\n");
|
|
EaCalcReadNoSE(-1,1,rea,size,0x0e00);
|
|
|
|
if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
|
|
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
|
|
|
ot(";@ Do arithmetic:\n");
|
|
if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);
|
|
if (eor)
|
|
{
|
|
ot(" eor r1,r0,r1%s\n",asl);
|
|
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
|
}
|
|
|
|
OpGetFlags(eor==0,0); // Cmp like subtract
|
|
ot("\n");
|
|
|
|
if (eor) EaWrite(11, 1,ea,size,0x003f,1);
|
|
|
|
OpEnd(ea);
|
|
return 0;
|
|
}
|
|
|
|
// Emit a Cmpm opcode, 1011ddd1 xx001sss (rrr=Adst, xx=size extension, sss=Asrc)
|
|
int OpCmpm(int op)
|
|
{
|
|
int size=0,sea=0,dea=0,use=0;
|
|
const char *asl="";
|
|
|
|
// get size, get EAs
|
|
size=(op>>6)&3; if (size>=3) return 1;
|
|
sea=(op&7)|0x18;
|
|
dea=(op>>9)&0x3f;
|
|
|
|
use=op&~0x0e07; // Use 1 handler for all registers..
|
|
if (size==0&&sea==0x1f) use|=0x0007; // ..except (a7)+
|
|
if (size==0&&dea==0x1f) use|=0x0e00;
|
|
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,sea); Cycles=4;
|
|
|
|
ot(";@ Get src operand into r11:\n");
|
|
EaCalc (0,0x0007, sea,size,1);
|
|
EaRead (0, 11, sea,size,0x0007,1);
|
|
|
|
ot(";@ Get dst operand into r0:\n");
|
|
EaCalcReadNoSE(-1,0,dea,size,0x0e00);
|
|
|
|
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
|
|
|
ot(" rsbs r0,r11,r0%s\n",asl);
|
|
OpGetFlags(1,0); // Cmp like subtract
|
|
ot("\n");
|
|
|
|
OpEnd(sea);
|
|
return 0;
|
|
}
|
|
|
|
|
|
// Emit a Chk opcode, 0100ddd1 x0eeeeee (rrr=Dn, x=size extension, eeeeee=ea)
|
|
int OpChk(int op)
|
|
{
|
|
int rea=0;
|
|
int size=0,ea=0,use=0;
|
|
|
|
// Get EA and register EA
|
|
rea=(op>>9)&7;
|
|
if((op>>7)&1)
|
|
size=1; // word operation
|
|
else size=2; // long
|
|
ea=op&0x3f;
|
|
|
|
if (EaAn(ea)) return 1; // not a valid mode
|
|
if (size!=1) return 1; // 000 variant only supports word
|
|
|
|
// See if we can do this opcode:
|
|
if (EaCanRead(ea,size)==0) return 1;
|
|
|
|
use=OpBase(op,size);
|
|
use&=~0x0e00; // Use 1 handler for register d0-7
|
|
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
|
|
|
OpStart(op,ea); Cycles=10;
|
|
|
|
ot(";@ Get value into r0:\n");
|
|
EaCalcReadNoSE(-1,0,ea,size,0x003f);
|
|
|
|
ot(";@ Get register operand into r1:\n");
|
|
EaCalcReadNoSE(-1,1,rea,size,0x0e00);
|
|
|
|
if (size<2) ot(" mov r0,r0,asl #%d\n",size?16:24);
|
|
if (size<2) ot(" mov r1,r1,asl #%d\n\n",size?16:24);
|
|
|
|
ot(";@ get flags, including undocumented ones\n");
|
|
ot(" and r3,r10,#0x80000000\n");
|
|
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
|
OpGetFlags(0,0);
|
|
|
|
ot(";@ is reg negative?\n");
|
|
ot(" bmi chktrap%.4x\n",op);
|
|
|
|
ot(";@ Do arithmetic:\n");
|
|
ot(" bic r10,r10,#0x80000000 ;@ N\n");
|
|
ot(" cmp r1,r0\n");
|
|
ot(" bgt chktrap%.4x\n",op);
|
|
|
|
ot(";@ old N remains\n");
|
|
ot(" orr r10,r10,r3\n");
|
|
OpEnd(ea);
|
|
|
|
ot("chktrap%.4x%s ;@ CHK exception:\n",op,ms?"":":");
|
|
ot(" mov r0,#6\n");
|
|
ot(" bl Exception\n");
|
|
Cycles+=40;
|
|
OpEnd(ea);
|
|
|
|
return 0;
|
|
}
|
|
|