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- // Dave's Disa 68000 Disassembler
- #ifndef __GNUC__
- #pragma warning(disable:4115)
- #endif
- #include <stdio.h>
- #include <string.h>
- #include "Disa.h"
- unsigned int DisaPc=0;
- char *DisaText=NULL; // Text buffer to write in
- static char Tasm[]="bwl?";
- static char Comment[64]="";
- unsigned short (*DisaWord)(unsigned int a)=NULL;
- static unsigned int DisaLong(unsigned int a)
- {
- unsigned int d=0;
- if (DisaWord==NULL) return d;
- d= DisaWord(a)<<16;
- d|=DisaWord(a+2)&0xffff;
- return d;
- }
- // Get text version of the effective address
- int DisaGetEa(char *t,int ea,int size)
- {
- ea&=0x3f; t[0]=0;
- if ((ea&0x38)==0x00) { sprintf(t,"d%d",ea ); return 0; } // 000rrr
- if ((ea&0x38)==0x08) { sprintf(t,"a%d",ea&7); return 0; } // 001rrr
- if ((ea&0x38)==0x10) { sprintf(t,"(a%d)",ea&7); return 0; } // 010rrr
- if ((ea&0x38)==0x18) { sprintf(t,"(a%d)+",ea&7); return 0; } // 011rrr
- if ((ea&0x38)==0x20) { sprintf(t,"-(a%d)",ea&7); return 0; } // 100rrr
- if ((ea&0x38)==0x28) { sprintf(t,"($%x,a%d)",DisaWord(DisaPc)&0xffff,ea&7); DisaPc+=2; return 0; } // 101rrr
- if ((ea&0x38)==0x30)
- {
- // 110nnn - An + Disp + D/An
- int areg=0,ext=0,off=0,da=0,reg=0,wol=0,scale=0;
- ext=DisaWord(DisaPc)&0xffff;
- areg=ea&7;
- off=ext&0xff; da =ext&0x8000?'a':'d';
- reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';
- scale=1<<((ext>>9)&3);
- if (scale<2) sprintf(t,"($%x,a%d,%c%d.%c)", off,areg,da,reg,wol);
- else sprintf(t,"($%x,a%d,%c%d.%c*%d)",off,areg,da,reg,wol,scale); // 68020
- DisaPc+=2;
- return 0;
- }
- if (ea==0x38) { sprintf(t,"$%x.w",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0; } // 111000 - Absolute short
- if (ea==0x39) { sprintf(t,"$%x.l",DisaLong(DisaPc)); DisaPc+=4; return 0; } // 111001 - Absolute long
- if (ea==0x3a)
- {
- // 111010 - PC Relative
- int ext=DisaWord(DisaPc)&0xffff;
- sprintf(t,"($%x,pc)",ext);
- sprintf(Comment,"; =%x",DisaPc+(short)ext); // Comment where pc+ext is
- DisaPc+=2;
- return 0;
- }
- if (ea==0x3b)
- {
- // 111011 - PC Relative + D/An
- int ext=0,off=0,da=0,reg=0,wol=0,scale=0;
- ext=DisaWord(DisaPc)&0xffff;
- off=ext&0xff; da =ext&0x8000?'a':'d';
- reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';
- scale=1<<((ext>>9)&3);
- if (scale<2) sprintf(t,"($%x,pc,%c%d.%c)", off,da,reg,wol);
- else sprintf(t,"($%x,pc,%c%d.%c*%d)",off,da,reg,wol,scale); // 68020
- sprintf(Comment,"; =%x",DisaPc+(char)off); // Comment where pc+ext is
- DisaPc+=2;
- return 0;
- }
- if (ea==0x3c)
- {
- // 111100 - Immediate
- switch (size)
- {
- case 0: sprintf(t,"#$%x",DisaWord(DisaPc)&0x00ff); DisaPc+=2; return 0;
- case 1: sprintf(t,"#$%x",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0;
- case 2: sprintf(t,"#$%x",DisaLong(DisaPc) ); DisaPc+=4; return 0;
- }
- return 1;
- }
- // Unknown effective address
- sprintf(t,"ea=(%d%d%d %d%d%d)",
- (ea>>5)&1,(ea>>4)&1,(ea>>3)&1,
- (ea>>2)&1,(ea>>1)&1, ea &1);
- return 1;
- }
- static void GetOffset(char *text)
- {
- int off=(short)DisaWord(DisaPc); DisaPc+=2;
- if (off<0) sprintf(text,"-$%x",-off);
- else sprintf(text,"$%x", off);
- }
- // ================ Opcodes 0x0000+ ================
- static int DisaArithImm(int op)
- {
- // Or/And/Sub/Add/Eor/Cmp Immediate 0000ttt0 xxDDDddd (tt=type, xx=size extension, DDDddd=Dest ea)
- int dea=0;
- char seat[64]="",deat[64]="";
- int type=0,size=0;
- char *arith[8]={"or","and","sub","add","?","eor","cmp","?"};
- type=(op>>9)&7; if (type==4 || type>=7) return 1;
- size=(op>>6)&3; if (size>=3) return 1;
- dea=op&0x3f; if (dea==0x3c) return 1;
- DisaGetEa(seat,0x3c,size);
- DisaGetEa(deat,dea, size);
- sprintf(DisaText,"%si.%c %s, %s",arith[type],Tasm[size],seat,deat);
- return 0;
- }
- // ================ Opcodes 0x0108+ ================
- static int DisaMovep(int op)
- {
- // movep.x (Aa),Dn - 0000nnn1 dx001aaa nn
- int dn=0,dir=0,size=0,an=0;
- char offset[32]="";
- dn =(op>>9)&7;
- dir =(op>>7)&1;
- size=(op>>6)&1; size++;
- an = op &7;
- GetOffset(offset);
- if (dir) sprintf(DisaText,"movep.%c d%d, (%s,a%d)",Tasm[size],dn,offset,an);
- else sprintf(DisaText,"movep.%c (%s,a%d), d%d",Tasm[size],offset,an,dn);
- return 0;
- }
- // ================ Opcodes 0x007c+ ================
- static int DisaArithSr(int op)
- {
- // Ori/Andi/Eori $nnnn,sr 0000t0tx 0s111100
- char *opcode[6]={"ori","andi","","","","eori"};
- char seat[64]="";
- int type=0,size=0;
- type=(op>>9)&5;
- size=(op>>6)&1;
- DisaGetEa(seat,0x3c,size);
- sprintf(DisaText,"%s.%c %s, %s", opcode[type], Tasm[size], seat, size?"sr":"ccr");
- return 0;
- }
- // ================ Opcodes 0x0100+ ================
- static int DisaBtstReg(int op)
- {
- // Btst/Bchg/Bclr/Bset 0000nnn1 tteeeeee (nn=reg number, eeeeee=Dest ea)
- int type=0;
- int sea=0,dea=0;
- char seat[64]="",deat[64]="";
- char *opcode[4]={"btst","bchg","bclr","bset"};
- sea =(op>>9)&7;
- type=(op>>6)&3;
- dea= op&0x3f;
- if ((dea&0x38)==0x08) return 1; // movep
- DisaGetEa(seat,sea,0);
- DisaGetEa(deat,dea,0);
- sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);
- return 0;
- }
- // ================ Opcodes 0x0800+ ================
- static int DisaBtstImm(int op)
- {
- // Btst/Bchg/Bclr/Bset 00001000 tteeeeee 00 nn (eeeeee=ea, nn=bit number)
- int type=0;
- char seat[64]="",deat[64]="";
- char *opcode[4]={"btst","bchg","bclr","bset"};
- type=(op>>6)&3;
- DisaGetEa(seat, 0x3c,0);
- DisaGetEa(deat,op&0x3f,0);
- sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);
- return 0;
- }
- // ================ Opcodes 0x1000+ ================
- static int DisaMove(int op)
- {
- // Move 00xxdddD DDssssss (xx=size extension, ssssss=Source EA, DDDddd=Dest ea)
- int sea=0,dea=0;
- char inst[64]="",seat[64]="",deat[64]="";
- char *movea="";
- int size=0;
- if ((op&0x01c0)==0x0040) movea="a"; // See if it's a movea opcode
- // Find size extension
- switch (op&0x3000)
- {
- case 0x1000: size=0; break;
- case 0x3000: size=1; break;
- case 0x2000: size=2; break;
- default: return 1;
- }
- sea = op&0x003f;
- DisaGetEa(seat,sea,size);
- dea =(op&0x01c0)>>3;
- dea|=(op&0x0e00)>>9;
- DisaGetEa(deat,dea,size);
- sprintf(inst,"move%s.%c",movea,Tasm[size]);
- sprintf(DisaText,"%s %s, %s",inst,seat,deat);
- return 0;
- }
- // ================ Opcodes 0x4000+ ================
- static int DisaNeg(int op)
- {
- // 01000tt0 xxeeeeee (tt=negx/clr/neg/not, xx=size, eeeeee=EA)
- char eat[64]="";
- int type=0,size=0;
- char *opcode[4]={"negx","clr","neg","not"};
- type=(op>>9)&3;
- size=(op>>6)&3; if (size>=3) return 1;
- DisaGetEa(eat,op&0x3f,size);
- sprintf(DisaText,"%s.%c %s",opcode[type],Tasm[size],eat);
- return 0;
- }
- // ================ Opcodes 0x40c0+ ================
- static int DisaMoveSr(int op)
- {
- // 01000tt0 11eeeeee (tt=type, xx=size, eeeeee=EA)
- int type=0,ea=0;
- char eat[64]="";
- type=(op>>9)&3;
- ea=op&0x3f;
- DisaGetEa(eat,ea,1);
- switch (type)
- {
- default: sprintf(DisaText,"move sr, %s", eat); break;
- case 1: sprintf(DisaText,"move ccr, %s",eat); break;
- case 2: sprintf(DisaText,"move %s, ccr",eat); break;
- case 3: sprintf(DisaText,"move %s, sr", eat); break;
- }
- return 0;
- }
- static int OpChk(int op)
- {
- int sea=0,dea=0;
- char seat[64]="",deat[64]="";
- sea=op&0x003f;
- DisaGetEa(seat,sea,0);
- dea=(op>>9)&7; dea|=8;
- DisaGetEa(deat,dea,2);
- sprintf(DisaText,"chk %s, %s",seat,deat);
- return 0;
- }
- // ================ Opcodes 0x41c0+ ================
- static int DisaLea(int op)
- {
- // Lea 0100nnn1 11eeeeee (eeeeee=ea)
- int sea=0,dea=0;
- char seat[64]="",deat[64]="";
- sea=op&0x003f;
- DisaGetEa(seat,sea,0);
- dea=(op>>9)&7; dea|=8;
- DisaGetEa(deat,dea,2);
- sprintf(DisaText,"lea %s, %s",seat,deat);
- return 0;
- }
- static int MakeRegList(char *list,int mask,int ea)
- {
- int reverse=0,i=0,low=0,len=0;
- if ((ea&0x38)==0x20) reverse=1; // -(An), bitfield is reversed
- mask&=0xffff; list[0]=0;
- for (i=0;i<17;i++)
- {
- int bit=0;
- // Mask off bit i:
- if (reverse) bit=0x8000>>i; else bit=1<<i;
- bit&=mask;
- if (bit==0 || i==8)
- {
- // low to i-1 are a continuous section, add it:
- char add[16]="";
- int ad=low&8?'a':'d';
- if (low==i-1) sprintf(add,"%c%d/", ad,low&7);
- if (low< i-1) sprintf(add,"%c%d-%c%d/",ad,low&7, ad,(i-1)&7);
- strcat(list,add);
- low=i; // Next section
- }
- if (bit==0) low=i+1;
- }
- // Knock off trailing '/'
- len=strlen(list);
- if (len>0) if (list[len-1]=='/') list[len-1]=0;
- return 0;
- }
- // ================ Opcodes 0x4800+ ================
- static int DisaNbcd(int op)
- {
- // Nbcd 01001000 00eeeeee (eeeeee=ea)
- int ea=0;
- char eat[64]="";
- ea=op&0x003f;
- DisaGetEa(eat,ea,0);
- sprintf(DisaText,"nbcd %s",eat);
- return 0;
- }
- // ================ Opcodes 0x4840+ ================
- static int DisaSwap(int op)
- {
- // Swap, 01001000 01000nnn swap Dn
- sprintf(DisaText,"swap d%d",op&7);
- return 0;
- }
- // ================ Opcodes 0x4850+ ================
- static int DisaPea(int op)
- {
- // Pea 01001000 01eeeeee (eeeeee=ea) pea
- int ea=0;
- char eat[64]="";
- ea=op&0x003f; if (ea<0x10) return 1; // swap opcode
- DisaGetEa(eat,ea,2);
- sprintf(DisaText,"pea %s",eat);
- return 0;
- }
- // ================ Opcodes 0x4880+ ================
- static int DisaExt(int op)
- {
- // Ext 01001000 1x000nnn (x=size, eeeeee=EA)
- char eat[64]="";
- int size=0;
- size=(op>>6)&1; size++;
- DisaGetEa(eat,op&0x3f,size);
- sprintf(DisaText,"ext.%c %s",Tasm[size],eat);
- return 0;
- }
- // ================ Opcodes 0x4890+ ================
- static int DisaMovem(int op)
- {
- // Movem 01001d00 1xeeeeee regmask d=direction, x=size, eeeeee=EA
- int dir=0,size=0;
- int ea=0,mask=0;
- char list[64]="",eat[64]="";
- dir=(op>>10)&1;
- size=((op>>6)&1)+1;
- ea=op&0x3f; if (ea<0x10) return 1; // ext opcode
- mask=DisaWord(DisaPc)&0xffff; DisaPc+=2;
- MakeRegList(list,mask,ea); // Turn register mask into text
- DisaGetEa(eat,ea,size);
- if (dir) sprintf(DisaText,"movem.%c %s, %s",Tasm[size],eat,list);
- else sprintf(DisaText,"movem.%c %s, %s",Tasm[size],list,eat);
- return 0;
- }
- // ================ Opcodes 0x4e40+ ================
- static int DisaTrap(int op)
- {
- sprintf(DisaText,"trap #%d",op&0xf);
- return 0;
- }
- // ================ Opcodes 0x4e50+ ================
- static int DisaLink(int op)
- {
- // Link opcode, 01001110 01010nnn dd link An,#offset
- char eat[64]="";
- char offset[32]="";
- DisaGetEa(eat,(op&7)|8,0);
- GetOffset(offset);
- sprintf(DisaText,"link %s,#%s",eat,offset);
- return 0;
- }
- // ================ Opcodes 0x4e58+ ================
- static int DisaUnlk(int op)
- {
- // Link opcode, 01001110 01011nnn dd unlk An
- char eat[64]="";
- DisaGetEa(eat,(op&7)|8,0);
- sprintf(DisaText,"unlk %s",eat);
- return 0;
- }
- // ================ Opcodes 0x4e60+ ================
- static int DisaMoveUsp(int op)
- {
- // Move USP opcode, 01001110 0110dnnn move An to/from USP (d=direction)
- int ea=0,dir=0;
- char eat[64]="";
- dir=(op>>3)&1;
- ea=(op&7)|8;
- DisaGetEa(eat,ea,0);
- if (dir) sprintf(DisaText,"move usp, %s",eat);
- else sprintf(DisaText,"move %s, usp",eat);
- return 0;
- }
- // ================ Opcodes 0x4e70+ ================
- static int Disa4E70(int op)
- {
- char *inst[8]={"reset","nop","stop","rte","rtd","rts","trapv","rtr"};
- int n=0;
- n=op&7;
- sprintf(DisaText,"%s",inst[n]);
- //todo - 'stop' with 16 bit data
- return 0;
- }
- // ================ Opcodes 0x4a00+ ================
- static int DisaTst(int op)
- {
- // Tst 01001010 xxeeeeee (eeeeee=ea)
- int ea=0;
- char eat[64]="";
- int size=0;
- ea=op&0x003f;
- DisaGetEa(eat,ea,0);
- size=(op>>6)&3; if (size>=3) return 1;
- sprintf(DisaText,"tst.%c %s",Tasm[size],eat);
- return 0;
- }
- static int DisaTas(int op)
- {
- // Tas 01001010 11eeeeee (eeeeee=ea)
- int ea=0;
- char eat[64]="";
- ea=op&0x003f;
- DisaGetEa(eat,ea,0);
- sprintf(DisaText,"tas %s",eat);
- return 0;
- }
- // ================ Opcodes 0x4e80+ ================
- static int DisaJsr(int op)
- {
- // Jsr/Jmp 0100 1110 1mEE Eeee (eeeeee=ea m=1=jmp)
- int sea=0;
- char seat[64]="";
- sea=op&0x003f;
- DisaGetEa(seat,sea,0);
- sprintf(DisaText,"j%s %s", op&0x40?"mp":"sr", seat);
- return 0;
- }
- // ================ Opcodes 0x5000+ ================
- static int DisaAddq(int op)
- {
- // 0101nnnt xxeeeeee (nnn=#8,1-7 t=addq/subq xx=size, eeeeee=EA)
- int num=0,type=0,size=0,ea=0;
- char eat[64]="";
- num =(op>>9)&7; if (num==0) num=8;
- type=(op>>8)&1;
- size=(op>>6)&3; if (size>=3) return 1;
- ea = op&0x3f;
- DisaGetEa(eat,ea,size);
- sprintf(DisaText,"%s.%c #%d, %s",type?"subq":"addq",Tasm[size],num,eat);
- return 0;
- }
- // ================ Opcodes 0x50c0+ ================
- static int DisaSet(int op)
- {
- // 0101cccc 11eeeeee (sxx ea)
- static char *cond[16]=
- {"t" ,"f", "hi","ls","cc","cs","ne","eq",
- "vc","vs","pl","mi","ge","lt","gt","le"};
- char *cc="";
- int ea=0;
- char eat[64]="";
- cc=cond[(op>>8)&0xf]; // Get condition code
- ea=op&0x3f;
- if ((ea&0x38)==0x08) return 1; // dbra, not scc
- DisaGetEa(eat,ea,0);
- sprintf(DisaText,"s%s %s",cc,eat);
- return 0;
- }
- // ================ Opcodes 0x50c8+ ================
- static int DisaDbra(int op)
- {
- // 0101cccc 11001nnn offset (dbra/dbxx Rn,offset)
- int dea=0; char deat[64]="";
- int pc=0,Offset=0;
- static char *BraCode[16]=
- {"bt" ,"bra","bhi","bls","bcc","bcs","bne","beq",
- "bvc","bvs","bpl","bmi","bge","blt","bgt","ble"};
- char *Bra="";
- dea=op&7;
- DisaGetEa(deat,dea,2);
- // Get condition code
- Bra=BraCode[(op>>8)&0xf];
- // Get offset
- pc=DisaPc;
- Offset=(short)DisaWord(DisaPc); DisaPc+=2;
- sprintf(DisaText,"d%s %s, %x",Bra,deat,pc+Offset);
- return 0;
- }
- // ================ Opcodes 0x6000+ ================
- static int DisaBranch(int op)
- {
- // Branch 0110cccc nn (cccc=condition)
- int pc=0,Offset=0;
- static char *BraCode[16]=
- {"bra","bsr","bhi","bls","bcc","bcs","bne","beq",
- "bvc","bvs","bpl","bmi","bge","blt","bgt","ble"};
- char *Bra="";
- // Get condition code
- Bra=BraCode[(op>>8)&0x0f];
- // Get offset
- pc=DisaPc;
- Offset=(char)(op&0xff);
- if (Offset== 0) { Offset=(short)DisaWord(DisaPc); DisaPc+=2; }
- else if (Offset==-1) { Offset= DisaLong(DisaPc); DisaPc+=4; }
- sprintf(DisaText,"%s %x",Bra,pc+Offset);
- return 0;
- }
- // ================ Opcodes 0x7000+ ================
- static int DisaMoveq(int op)
- {
- // Moveq 0111rrr0 nn (rrr=Dest register, nn=data)
- int dea=0; char deat[64]="";
- char *inst="moveq";
- int val=0;
- dea=(op>>9)&7;
- DisaGetEa(deat,dea,2);
- val=(char)(op&0xff);
- sprintf(DisaText,"%s #$%x, %s",inst,val,deat);
- return 0;
- }
- // ================ Opcodes 0x8000+ ================
- static int DisaArithReg(int op)
- {
- // 1t0tnnnd xxeeeeee (tt=type:or/sub/and/add xx=size, eeeeee=EA)
- int type=0,size=0,dir=0,rea=0,ea=0;
- char reat[64]="",eat[64]="";
- char *opcode[]={"or","sub","","","and","add"};
- type=(op>>12)&5;
- rea =(op>> 9)&7;
- dir =(op>> 8)&1;
- size=(op>> 6)&3; if (size>=3) return 1;
- ea = op&0x3f;
- if (dir && ea<0x10) return 1; // addx opcode
- DisaGetEa(reat,rea,size);
- DisaGetEa( eat, ea,size);
- if (dir) sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],reat,eat);
- else sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],eat,reat);
- return 0;
- }
- // ================ Opcodes 0x8100+ ================
- static int DisaAbcd(int op)
- {
- // 1t00ddd1 0000asss - sbcd/abcd Ds,Dd or -(As),-(Ad)
- int type=0;
- int dn=0,addr=0,sn=0;
- char *opcode[]={"sbcd","abcd"};
- type=(op>>14)&1;
- dn =(op>> 9)&7;
- addr=(op>> 3)&1;
- sn = op &7;
- if (addr) sprintf(DisaText,"%s -(a%d), -(a%d)",opcode[type],sn,dn);
- else sprintf(DisaText,"%s d%d, d%d", opcode[type],sn,dn);
- return 0;
- }
- // ================ Opcodes 0x80c0+ ================
- static int DisaMul(int op)
- {
- // Div/Mul: 1m00nnns 11eeeeee (m=Mul, nnn=Register Dn, s=signed, eeeeee=EA)
- int type=0,rea=0,sign=0,ea=0,size=1;
- char reat[64]="",eat[64]="";
- char *opcode[2]={"div","mul"};
- type=(op>>14)&1; // div/mul
- rea =(op>> 9)&7;
- sign=(op>> 8)&1;
- ea = op&0x3f;
- DisaGetEa(reat,rea,size);
- DisaGetEa( eat, ea,size);
- sprintf(DisaText,"%s%c.%c %s, %s",opcode[type],sign?'s':'u',Tasm[size],eat,reat);
- return 0;
- }
- // ================ Opcodes 0x90c0+ ================
- static int DisaAritha(int op)
- {
- // Suba/Cmpa/Adda 1tt1nnnx 11eeeeee (tt=type, x=size, eeeeee=Source EA)
- int type=0,size=0,sea=0,dea=0;
- char seat[64]="",deat[64]="";
- char *aritha[4]={"suba","cmpa","adda",""};
- 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
- DisaGetEa(seat,sea,size);
- DisaGetEa(deat,dea,size);
- sprintf(DisaText,"%s.%c %s, %s",aritha[type],Tasm[size],seat,deat);
- return 0;
- }
- // ================ Opcodes 0xb000+ ================
- static int DisaCmpEor(int op)
- {
- // Cmp/Eor 1011rrrt xxeeeeee (rrr=Dn, t=cmp/eor, xx=size extension, eeeeee=ea)
- char reat[64]="",eat[64]="";
- int type=0,size=0;
- type=(op>>8)&1;
- size=(op>>6)&3; if (size>=3) return 1;
- DisaGetEa(reat,(op>>9)&7,size);
- DisaGetEa(eat, op&0x3f, size);
- if (type) sprintf(DisaText,"eor.%c %s, %s",Tasm[size],reat,eat);
- else sprintf(DisaText,"cmp.%c %s, %s",Tasm[size],eat,reat);
- return 0;
- }
- static int DisaCmpm(int op)
- {
- char seat[64]="",deat[64]="";
- int type=0,size=0,sea,dea;
- type=(op>>8)&1;
- size=(op>>6)&3; if (size>=3) return 1;
- sea=(op&7)|0x18;
- dea=(op>>9)&0x3f;
- DisaGetEa(seat,sea,size);
- DisaGetEa(deat,dea,size);
- sprintf(DisaText,"cmpm.%c %s, %s",Tasm[size],seat,deat);
- return 0;
- }
- // ================ Opcodes 0xc140+ ================
- // 1100ttt1 01000sss exg ds,dt
- // 1100ttt1 01001sss exg as,at
- // 1100ttt1 10001sss exg as,dt
- static int DisaExg(int op)
- {
- int tr=0,type=0,sr=0;
- tr =(op>>9)&7;
- type= op&0xf8;
- sr = op&7;
- if (type==0x40) sprintf(DisaText,"exg d%d, d%d",sr,tr);
- else if (type==0x48) sprintf(DisaText,"exg a%d, a%d",sr,tr);
- else if (type==0x88) sprintf(DisaText,"exg a%d, d%d",sr,tr);
- else return 1;
- return 0;
- }
- // ================ Opcodes 0xd100+ ================
- static int DisaAddx(int op)
- {
- // 1t01ddd1 xx000sss addx
- int type=0,size=0,dea=0,sea=0,mem;
- char deat[64]="",seat[64]="";
- char *opcode[6]={"","subx","","","","addx"};
- type=(op>>12)&5;
- dea =(op>> 9)&7;
- size=(op>> 6)&3; if (size>=3) return 1;
- sea = op&7;
- mem = op&8;
- if(mem) { sea+=0x20; dea+=0x20; }
- DisaGetEa(deat,dea,size);
- DisaGetEa(seat,sea,size);
- sprintf(DisaText,"%s.%c %s, %s",opcode[type],Tasm[size],seat,deat);
- return 0;
- }
- // ================ Opcodes 0xe000+ ================
- static char *AsrName[4]={"as","ls","rox","ro"};
- static int DisaAsr(int op)
- {
- // Asr/l/Ror/l etc - 1110cccd xxuttnnn
- // (ccc=count, d=direction xx=size extension, u=use reg for count, tt=type, nnn=register Dn)
- int count=0,dir=0,size=0,usereg=0,type=0,num=0;
- count =(op>>9)&7;
- dir =(op>>8)&1;
- size =(op>>6)&3; if (size>=3) return 1; // todo Asr EA
- usereg=(op>>5)&1;
- type =(op>>3)&3;
- num = op &7; // Register number
- if (usereg==0) count=((count-1)&7)+1; // because ccc=000 means 8
- sprintf(DisaText,"%s%c.%c %c%d, d%d",
- AsrName[type], dir?'l':'r', Tasm[size],
- usereg?'d':'#', count, num);
- return 0;
- }
- static int DisaAsrEa(int op)
- {
- // Asr/l/Ror/l etc EA - 11100ttd 11eeeeee
- int type=0,dir=0,size=1;
- char eat[64]="";
- type=(op>>9)&3;
- dir =(op>>8)&1;
- DisaGetEa(eat,op&0x3f,size);
- sprintf(DisaText,"%s%c.w %s", AsrName[type], dir?'l':'r', eat);
- return 0;
- }
- // =================================================================
- static int TryOp(int op)
- {
- if ((op&0xf100)==0x0000) DisaArithImm(op); // Ori/And/Sub/Add/Eor/Cmp Immediate
- if ((op&0xf5bf)==0x003c) DisaArithSr(op); // Ori/Andi/Eori $nnnn,sr
- if ((op&0xf100)==0x0100) DisaBtstReg(op);
- if ((op&0xf138)==0x0108) DisaMovep(op);
- if ((op&0xff00)==0x0800) DisaBtstImm(op); // Btst/Bchg/Bclr/Bset
- if ((op&0xc000)==0x0000) DisaMove(op);
- if ((op&0xf900)==0x4000) DisaNeg(op); // Negx/Clr/Neg/Not
- if ((op&0xf140)==0x4100) OpChk(op);
- if ((op&0xf1c0)==0x41c0) DisaLea(op);
- if ((op&0xf9c0)==0x40c0) DisaMoveSr(op);
- if ((op&0xffc0)==0x4800) DisaNbcd(op);
- if ((op&0xfff8)==0x4840) DisaSwap(op);
- if ((op&0xffc0)==0x4840) DisaPea(op);
- if ((op&0xffb8)==0x4880) DisaExt(op);
- if ((op&0xfb80)==0x4880) DisaMovem(op);
- if ((op&0xff00)==0x4a00) DisaTst(op);
- if ((op&0xffc0)==0x4ac0) DisaTas(op);
- if ((op&0xfff0)==0x4e40) DisaTrap(op);
- if ((op&0xfff8)==0x4e50) DisaLink(op);
- if ((op&0xfff8)==0x4e58) DisaUnlk(op);
- if ((op&0xfff0)==0x4e60) DisaMoveUsp(op);
- if ((op&0xfff8)==0x4e70) Disa4E70(op);
- if ((op&0xff80)==0x4e80) DisaJsr(op);
- if ((op&0xf000)==0x5000) DisaAddq(op);
- if ((op&0xf0c0)==0x50c0) DisaSet(op);
- if ((op&0xf0f8)==0x50c8) DisaDbra(op);
- if ((op&0xf000)==0x6000) DisaBranch(op);
- if ((op&0xa000)==0x8000) DisaArithReg(op); // Or/Sub/And/Add
- if ((op&0xb1f0)==0x8100) DisaAbcd(op);
- if ((op&0xb130)==0x9100) DisaAddx(op);
- if ((op&0xb0c0)==0x80c0) DisaMul(op);
- if ((op&0xf100)==0x7000) DisaMoveq(op);
- if ((op&0x90c0)==0x90c0) DisaAritha(op);
- if ((op&0xf000)==0xb000) DisaCmpEor(op);
- if ((op&0xf138)==0xb108) DisaCmpm(op);
- if ((op&0xf130)==0xc100) DisaExg(op);
- if ((op&0xf000)==0xe000) DisaAsr(op);
- if ((op&0xf8c0)==0xe0c0) DisaAsrEa(op);
- // Unknown opcoode
- return 0;
- }
- int DisaGet()
- {
- int op=0;
- if (DisaWord==NULL) return 1;
- Comment[0]=0;
- DisaText[0]=0; // Assume opcode unknown
- op=DisaWord(DisaPc)&0xffff; DisaPc+=2;
- TryOp(op);
- strcat(DisaText,Comment);
- // Unknown opcoode
- return 0;
- }
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