mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-10-27 21:48:50 +01:00
821 lines
21 KiB
C
821 lines
21 KiB
C
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// Dave's Disa 68000 Disassembler
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#ifndef __GNUC__
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#pragma warning(disable:4115)
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "Disa.h"
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unsigned int DisaPc=0;
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char *DisaText=NULL; // Text buffer to write in
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static char Tasm[]="bwl?";
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static char Comment[64]="";
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unsigned short (CPU_CALL *DisaWord)(unsigned int a)=NULL;
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static unsigned int DisaLong(unsigned int a)
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{
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unsigned int d=0;
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if (DisaWord==NULL) return d;
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d= DisaWord(a)<<16;
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d|=DisaWord(a+2)&0xffff;
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return d;
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}
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// Get text version of the effective address
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int DisaGetEa(char *t,int ea,int size)
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{
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ea&=0x3f; t[0]=0;
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if ((ea&0x38)==0x00) { sprintf(t,"d%d",ea ); return 0; } // 000rrr
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if ((ea&0x38)==0x08) { sprintf(t,"a%d",ea&7); return 0; } // 001rrr
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if ((ea&0x38)==0x10) { sprintf(t,"(a%d)",ea&7); return 0; } // 010rrr
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if ((ea&0x38)==0x18) { sprintf(t,"(a%d)+",ea&7); return 0; } // 011rrr
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if ((ea&0x38)==0x20) { sprintf(t,"-(a%d)",ea&7); return 0; } // 100rrr
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if ((ea&0x38)==0x28) { sprintf(t,"($%x,a%d)",DisaWord(DisaPc)&0xffff,ea&7); DisaPc+=2; return 0; } // 101rrr
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if ((ea&0x38)==0x30)
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{
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// 110nnn - An + Disp + D/An
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int areg=0,ext=0,off=0,da=0,reg=0,wol=0,scale=0;
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ext=DisaWord(DisaPc)&0xffff;
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areg=ea&7;
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off=ext&0xff; da =ext&0x8000?'a':'d';
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reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';
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scale=1<<((ext>>9)&3);
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if (scale<2) sprintf(t,"($%x,a%d,%c%d.%c)", off,areg,da,reg,wol);
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else sprintf(t,"($%x,a%d,%c%d.%c*%d)",off,areg,da,reg,wol,scale); // 68020
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DisaPc+=2;
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return 0;
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}
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if (ea==0x38) { sprintf(t,"$%x.w",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0; } // 111000 - Absolute short
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if (ea==0x39) { sprintf(t,"$%x.l",DisaLong(DisaPc)); DisaPc+=4; return 0; } // 111001 - Absolute long
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if (ea==0x3a)
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{
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// 111010 - PC Relative
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int ext=DisaWord(DisaPc)&0xffff;
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sprintf(t,"($%x,pc)",ext);
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sprintf(Comment,"; =%x",DisaPc+(short)ext); // Comment where pc+ext is
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DisaPc+=2;
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return 0;
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}
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if (ea==0x3b)
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{
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// 111011 - PC Relative + D/An
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int ext=0,off=0,da=0,reg=0,wol=0,scale=0;
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ext=DisaWord(DisaPc)&0xffff;
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off=ext&0xff; da =ext&0x8000?'a':'d';
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reg=(ext>>12)&7; wol=ext&0x0800?'l':'w';
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scale=1<<((ext>>9)&3);
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if (scale<2) sprintf(t,"($%x,pc,%c%d.%c)", off,da,reg,wol);
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else sprintf(t,"($%x,pc,%c%d.%c*%d)",off,da,reg,wol,scale); // 68020
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sprintf(Comment,"; =%x",DisaPc+(char)off); // Comment where pc+ext is
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DisaPc+=2;
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return 0;
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}
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if (ea==0x3c)
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{
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// 111100 - Immediate
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switch (size)
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{
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case 0: sprintf(t,"#$%x",DisaWord(DisaPc)&0x00ff); DisaPc+=2; return 0;
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case 1: sprintf(t,"#$%x",DisaWord(DisaPc)&0xffff); DisaPc+=2; return 0;
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case 2: sprintf(t,"#$%x",DisaLong(DisaPc) ); DisaPc+=4; return 0;
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}
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return 1;
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}
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// Unknown effective address
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sprintf(t,"ea=(%d%d%d %d%d%d)",
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(ea>>5)&1,(ea>>4)&1,(ea>>3)&1,
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(ea>>2)&1,(ea>>1)&1, ea &1);
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return 1;
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}
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static void GetOffset(char *text)
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{
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int off=(short)DisaWord(DisaPc); DisaPc+=2;
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if (off<0) sprintf(text,"-$%x",-off);
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else sprintf(text,"$%x", off);
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}
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// ================ Opcodes 0x0000+ ================
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static int DisaArithImm(int op)
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{
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// Or/And/Sub/Add/Eor/Cmp Immediate 0000ttt0 xxDDDddd (tt=type, xx=size extension, DDDddd=Dest ea)
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int dea=0;
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char seat[64]="",deat[64]="";
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int type=0,size=0;
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char *arith[8]={"or","and","sub","add","?","eor","cmp","?"};
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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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dea=op&0x3f; if (dea==0x3c) return 1;
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DisaGetEa(seat,0x3c,size);
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DisaGetEa(deat,dea, size);
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sprintf(DisaText,"%si.%c %s, %s",arith[type],Tasm[size],seat,deat);
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return 0;
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}
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// ================ Opcodes 0x0108+ ================
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static int DisaMovep(int op)
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{
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// movep.x (Aa),Dn - 0000nnn1 dx001aaa nn
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int dn=0,dir=0,size=0,an=0;
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char offset[32]="";
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dn =(op>>9)&7;
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dir =(op>>7)&1;
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size=(op>>6)&1; size++;
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an = op &7;
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GetOffset(offset);
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if (dir) sprintf(DisaText,"movep.%c d%d, (%s,a%d)",Tasm[size],dn,offset,an);
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else sprintf(DisaText,"movep.%c (%s,a%d), d%d",Tasm[size],offset,an,dn);
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return 0;
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}
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// ================ Opcodes 0x007c+ ================
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static int DisaArithSr(int op)
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{
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// Ori/Andi/Eori $nnnn,sr 0000t0tx 0s111100
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char *opcode[6]={"ori","andi","","","","eori"};
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char seat[64]="";
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int type=0,size=0;
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type=(op>>9)&5;
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size=(op>>6)&1;
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DisaGetEa(seat,0x3c,size);
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sprintf(DisaText,"%s.%c %s, %s", opcode[type], Tasm[size], seat, size?"sr":"ccr");
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return 0;
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}
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// ================ Opcodes 0x0100+ ================
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static int DisaBtstReg(int op)
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{
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// Btst/Bchg/Bclr/Bset 0000nnn1 tteeeeee (nn=reg number, eeeeee=Dest ea)
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int type=0;
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int sea=0,dea=0;
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char seat[64]="",deat[64]="";
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char *opcode[4]={"btst","bchg","bclr","bset"};
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sea =(op>>9)&7;
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type=(op>>6)&3;
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dea= op&0x3f;
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if ((dea&0x38)==0x08) return 1; // movep
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DisaGetEa(seat,sea,0);
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DisaGetEa(deat,dea,0);
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sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);
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return 0;
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}
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// ================ Opcodes 0x0800+ ================
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static int DisaBtstImm(int op)
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{
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// Btst/Bchg/Bclr/Bset 00001000 tteeeeee 00 nn (eeeeee=ea, nn=bit number)
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int type=0;
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char seat[64]="",deat[64]="";
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char *opcode[4]={"btst","bchg","bclr","bset"};
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type=(op>>6)&3;
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DisaGetEa(seat, 0x3c,0);
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DisaGetEa(deat,op&0x3f,0);
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sprintf(DisaText,"%s %s, %s",opcode[type],seat,deat);
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return 0;
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}
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// ================ Opcodes 0x1000+ ================
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static int DisaMove(int op)
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{
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// Move 00xxdddD DDssssss (xx=size extension, ssssss=Source EA, DDDddd=Dest ea)
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int sea=0,dea=0;
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char inst[64]="",seat[64]="",deat[64]="";
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char *movea="";
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int size=0;
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if ((op&0x01c0)==0x0040) movea="a"; // See if it's a movea opcode
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// Find size extension
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switch (op&0x3000)
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{
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case 0x1000: size=0; break;
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case 0x3000: size=1; break;
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case 0x2000: size=2; break;
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default: return 1;
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}
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sea = op&0x003f;
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DisaGetEa(seat,sea,size);
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dea =(op&0x01c0)>>3;
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dea|=(op&0x0e00)>>9;
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DisaGetEa(deat,dea,size);
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sprintf(inst,"move%s.%c",movea,Tasm[size]);
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sprintf(DisaText,"%s %s, %s",inst,seat,deat);
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return 0;
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}
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// ================ Opcodes 0x4000+ ================
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static int DisaNeg(int op)
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{
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// 01000tt0 xxeeeeee (tt=negx/clr/neg/not, xx=size, eeeeee=EA)
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char eat[64]="";
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int type=0,size=0;
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char *opcode[4]={"negx","clr","neg","not"};
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type=(op>>9)&3;
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size=(op>>6)&3; if (size>=3) return 1;
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DisaGetEa(eat,op&0x3f,size);
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sprintf(DisaText,"%s.%c %s",opcode[type],Tasm[size],eat);
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return 0;
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}
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// ================ Opcodes 0x40c0+ ================
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static int DisaMoveSr(int op)
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{
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// 01000tt0 11eeeeee (tt=type, xx=size, eeeeee=EA)
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int type=0,ea=0;
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char eat[64]="";
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type=(op>>9)&3;
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ea=op&0x3f;
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DisaGetEa(eat,ea,1);
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switch (type)
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{
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default: sprintf(DisaText,"move sr, %s", eat); break;
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case 1: sprintf(DisaText,"move ccr, %s",eat); break;
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case 2: sprintf(DisaText,"move %s, ccr",eat); break;
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case 3: sprintf(DisaText,"move %s, sr", eat); break;
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}
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return 0;
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}
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// ================ Opcodes 0x41c0+ ================
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static int DisaLea(int op)
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{
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// Lea 0100nnn1 11eeeeee (eeeeee=ea)
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int sea=0,dea=0;
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char seat[64]="",deat[64]="";
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sea=op&0x003f;
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DisaGetEa(seat,sea,0);
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dea=(op>>9)&7; dea|=8;
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DisaGetEa(deat,dea,2);
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sprintf(DisaText,"lea %s, %s",seat,deat);
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return 0;
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}
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static int MakeRegList(char *list,int mask,int ea)
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{
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int reverse=0,i=0,low=0,len=0;
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if ((ea&0x38)==0x20) reverse=1; // -(An), bitfield is reversed
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mask&=0xffff; list[0]=0;
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for (i=0;i<17;i++)
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{
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int bit=0;
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// Mask off bit i:
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if (reverse) bit=0x8000>>i; else bit=1<<i;
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bit&=mask;
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if (bit==0 || i==8)
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{
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// low to i-1 are a continuous section, add it:
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char add[16]="";
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int ad=low&8?'a':'d';
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if (low==i-1) sprintf(add,"%c%d/", ad,low&7);
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if (low< i-1) sprintf(add,"%c%d-%c%d/",ad,low&7, ad,(i-1)&7);
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strcat(list,add);
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low=i; // Next section
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}
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if (bit==0) low=i+1;
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}
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// Knock off trailing '/'
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len=strlen(list);
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if (len>0) if (list[len-1]=='/') list[len-1]=0;
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return 0;
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}
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// ================ Opcodes 0x4840+ ================
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static int DisaSwap(int op)
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{
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// Swap, 01001000 01000nnn swap Dn
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sprintf(DisaText,"swap d%d",op&7);
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return 0;
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}
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// ================ Opcodes 0x4850+ ================
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static int DisaPea(int op)
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{
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// Pea 01001000 01eeeeee (eeeeee=ea) pea
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int ea=0;
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char eat[64]="";
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ea=op&0x003f; if (ea<0x10) return 1; // swap opcode
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DisaGetEa(eat,ea,2);
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sprintf(DisaText,"pea %s",eat);
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return 0;
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}
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// ================ Opcodes 0x4880+ ================
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static int DisaExt(int op)
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{
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// Ext 01001000 1x000nnn (x=size, eeeeee=EA)
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char eat[64]="";
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int size=0;
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size=(op>>6)&1; size++;
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DisaGetEa(eat,op&0x3f,size);
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sprintf(DisaText,"ext.%c %s",Tasm[size],eat);
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return 0;
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}
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// ================ Opcodes 0x4890+ ================
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static int DisaMovem(int op)
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{
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// Movem 01001d00 1xeeeeee regmask d=direction, x=size, eeeeee=EA
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int dir=0,size=0;
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int ea=0,mask=0;
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char list[64]="",eat[64]="";
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dir=(op>>10)&1;
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size=((op>>6)&1)+1;
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ea=op&0x3f; if (ea<0x10) return 1; // ext opcode
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mask=DisaWord(DisaPc)&0xffff; DisaPc+=2;
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MakeRegList(list,mask,ea); // Turn register mask into text
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DisaGetEa(eat,ea,size);
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if (dir) sprintf(DisaText,"movem.%c %s, %s",Tasm[size],eat,list);
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else sprintf(DisaText,"movem.%c %s, %s",Tasm[size],list,eat);
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return 0;
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}
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// ================ Opcodes 0x4e40+ ================
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static int DisaTrap(int op)
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{
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sprintf(DisaText,"trap #%d",op&0xf);
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return 0;
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}
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// ================ Opcodes 0x4e50+ ================
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static int DisaLink(int op)
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{
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// Link opcode, 01001110 01010nnn dd link An,#offset
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char eat[64]="";
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char offset[32]="";
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DisaGetEa(eat,(op&7)|8,0);
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GetOffset(offset);
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sprintf(DisaText,"link %s,#%s",eat,offset);
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return 0;
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}
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// ================ Opcodes 0x4e58+ ================
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static int DisaUnlk(int op)
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{
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// Link opcode, 01001110 01011nnn dd unlk An
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char eat[64]="";
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DisaGetEa(eat,(op&7)|8,0);
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sprintf(DisaText,"unlk %s",eat);
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return 0;
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}
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// ================ Opcodes 0x4e60+ ================
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static int DisaMoveUsp(int op)
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{
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// Move USP opcode, 01001110 0110dnnn move An to/from USP (d=direction)
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int ea=0,dir=0;
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char eat[64]="";
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dir=(op>>3)&1;
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ea=(op&7)|8;
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DisaGetEa(eat,ea,0);
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if (dir) sprintf(DisaText,"move usp, %s",eat);
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else sprintf(DisaText,"move %s, usp",eat);
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return 0;
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}
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// ================ Opcodes 0x4e70+ ================
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static int Disa4E70(int op)
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{
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char *inst[8]={"reset","nop","stop","rte","rtd","rts","trapv","rtr"};
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int n=0;
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n=op&7;
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sprintf(DisaText,"%s",inst[n]);
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//todo - 'stop' with 16 bit data
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return 0;
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}
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// ================ Opcodes 0x4a00+ ================
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static int DisaTst(int op)
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{
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// Tst 01001010 xxeeeeee (eeeeee=ea)
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int ea=0;
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char eat[64]="";
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int size=0;
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ea=op&0x003f;
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DisaGetEa(eat,ea,0);
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size=(op>>6)&3; if (size>=3) return 1;
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sprintf(DisaText,"tst.%c %s",Tasm[size],eat);
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return 0;
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}
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// ================ Opcodes 0x4e80+ ================
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static int DisaJsr(int op)
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{
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// Jsr/Jmp 0100 1110 1mEE Eeee (eeeeee=ea m=1=jmp)
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int sea=0;
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char seat[64]="";
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sea=op&0x003f;
|
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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;
|
|
}
|
|
|
|
// ================ 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;
|
|
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&0x3f;
|
|
|
|
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&0xf1c0)==0x41c0) DisaLea(op);
|
|
if ((op&0xf9c0)==0x40c0) DisaMoveSr(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&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&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;
|
|
}
|