mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
code review and optimizations
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@180 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz
parent
3a5e6cf847
commit
85a36a57a8
10 changed files with 540 additions and 364 deletions
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@ -19,13 +19,13 @@ struct Cyclone
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unsigned int a[8]; // [r7,#0x20]
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unsigned int pc; // [r7,#0x40] Memory Base+PC
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unsigned char srh; // [r7,#0x44] Status Register high (T_S__III)
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unsigned char xc; // [r7,#0x45] Extend flag (____??X?)
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unsigned char unused; // [r7,#0x45] Unused
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unsigned char flags; // [r7,#0x46] Flags (ARM order: ____NZCV) [68k order is XNZVC]
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unsigned char irq; // [r7,#0x47] IRQ level
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unsigned int osp; // [r7,#0x48] Other Stack Pointer (USP/SSP)
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unsigned int vector; // [r7,#0x4c] IRQ vector (temporary)
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unsigned int prev_pc;// [r7,#0x50] set to start address of currently executed opcode + 2 (if enabled in config.h)
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unsigned int unused; // [r7,#0x54] Unused
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unsigned int xc; // [r7,#0x4c] Extend flag (bit29: ??X? _)
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unsigned int prev_pc; // [r7,#0x50] set to start address of currently executed opcode + 2 (if enabled in config.h)
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unsigned int unused1; // [r7,#0x54] Unused
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int stopped; // [r7,#0x58] 1 == processor is in stopped state
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int cycles; // [r7,#0x5c]
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int membase; // [r7,#0x60] Memory Base (ARM address minus 68000 address)
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@ -272,6 +272,21 @@ static int DisaMoveSr(int op)
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return 0;
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}
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static int OpChk(op)
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{
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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,"chk %s, %s",seat,deat);
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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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@ -326,6 +341,20 @@ static int MakeRegList(char *list,int mask,int ea)
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return 0;
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}
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// ================ Opcodes 0x4800+ ================
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static int DisaNbcd(int op)
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{
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// Nbcd 01001000 00eeeeee (eeeeee=ea)
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int ea=0;
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char eat[64]="";
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ea=op&0x003f;
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DisaGetEa(eat,ea,0);
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sprintf(DisaText,"nbcd %s",eat);
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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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@ -465,6 +494,19 @@ static int DisaTst(int op)
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return 0;
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}
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static int DisaTas(int op)
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{
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// Tas 01001010 11eeeeee (eeeeee=ea)
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int ea=0;
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char eat[64]="";
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ea=op&0x003f;
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DisaGetEa(eat,ea,0);
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sprintf(DisaText,"tas %s",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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@ -684,6 +726,23 @@ static int DisaCmpEor(int op)
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return 0;
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}
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static int DisaCmpm(int op)
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{
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char seat[64]="",deat[64]="";
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int type=0,size=0,sea,dea;
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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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sea=(op&7)|0x18;
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dea=(op>>9)&0x3f;
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DisaGetEa(seat,sea,size);
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DisaGetEa(deat,dea,size);
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sprintf(DisaText,"cmpm.%c %s, %s",Tasm[size],seat,deat);
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return 0;
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}
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// ================ Opcodes 0xc140+ ================
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// 1100ttt1 01000sss exg ds,dt
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// 1100ttt1 01001sss exg as,at
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@ -708,14 +767,16 @@ static int DisaExg(int op)
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static int DisaAddx(int op)
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{
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// 1t01ddd1 xx000sss addx
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int type=0,size=0,dea=0,sea=0;
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int type=0,size=0,dea=0,sea=0,mem;
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char deat[64]="",seat[64]="";
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char *opcode[6]={"","subx","","","","addx"};
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type=(op>>12)&5;
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dea =(op>> 9)&7;
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size=(op>> 6)&3; if (size>=3) return 1;
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sea = op&0x3f;
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sea = op&7;
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mem = op&8;
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if(mem) { sea+=0x20; dea+=0x20; }
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DisaGetEa(deat,dea,size);
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DisaGetEa(seat,sea,size);
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@ -772,13 +833,16 @@ static int TryOp(int op)
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if ((op&0xff00)==0x0800) DisaBtstImm(op); // Btst/Bchg/Bclr/Bset
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if ((op&0xc000)==0x0000) DisaMove(op);
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if ((op&0xf900)==0x4000) DisaNeg(op); // Negx/Clr/Neg/Not
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if ((op&0xf140)==0x4100) OpChk(op);
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if ((op&0xf1c0)==0x41c0) DisaLea(op);
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if ((op&0xf9c0)==0x40c0) DisaMoveSr(op);
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if ((op&0xffc0)==0x4800) DisaNbcd(op);
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if ((op&0xfff8)==0x4840) DisaSwap(op);
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if ((op&0xffc0)==0x4840) DisaPea(op);
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if ((op&0xffb8)==0x4880) DisaExt(op);
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if ((op&0xfb80)==0x4880) DisaMovem(op);
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if ((op&0xff00)==0x4a00) DisaTst(op);
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if ((op&0xffc0)==0x4ac0) DisaTas(op);
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if ((op&0xfff0)==0x4e40) DisaTrap(op);
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if ((op&0xfff8)==0x4e50) DisaLink(op);
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if ((op&0xfff8)==0x4e58) DisaUnlk(op);
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@ -796,6 +860,7 @@ static int TryOp(int op)
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if ((op&0xf100)==0x7000) DisaMoveq(op);
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if ((op&0x90c0)==0x90c0) DisaAritha(op);
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if ((op&0xf000)==0xb000) DisaCmpEor(op);
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if ((op&0xf138)==0xb108) DisaCmpm(op);
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if ((op&0xf130)==0xc100) DisaExg(op);
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if ((op&0xf000)==0xe000) DisaAsr(op);
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if ((op&0xf8c0)==0xe0c0) DisaAsrEa(op);
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@ -100,7 +100,7 @@ static int EaCalcReg(int r,int ea,int mask,int forceor,int shift,int noshift=0)
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if (ea>=8) needor=1; // Need to OR to access A0-7
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if ((mask>>low)&8) if (ea&8) needor=0; // Ah - no we don't actually need to or, since the bit is high in r8
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if (((mask&g_op)>>low)&8) needor=0; // Ah - no we don't actually need to or, since the bit is high in r8
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if (forceor) needor=1; // Special case for 0x30-0x38 EAs ;)
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@ -121,8 +121,9 @@ static int EaCalcReg(int r,int ea,int mask,int forceor,int shift,int noshift=0)
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}
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// EaCalc - ARM Register 'a' = Effective Address
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// Trashes r0,r2 and r3
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// If ea>=0x10, trashes r0,r2 and r3, else nothing
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// size values 0, 1, 2 ~ byte, word, long
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// mask shows usable bits in r8
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int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)
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{
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char text[32]="";
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@ -151,12 +152,19 @@ int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)
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if ((ea&7)==7 && step<2) step=2; // move.b (a7)+ or -(a7) steps by 2 not 1
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if (ea==0x1f||ea==0x27) // A7 handlers are always separate
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{
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ot(" ldr r%d,[r7,#0x3c] ;@ A7\n",a);
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}
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else
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{
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EaCalcReg(2,ea,mask,0,0,1);
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if(mask)
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for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is
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lsl=2-low; // Having a lsl #x here saves one opcode
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if (lsl>=0) ot(" ldr r%d,[r7,r2,lsl #%i]\n",a,lsl);
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else if (lsl<0) ot(" ldr r%d,[r7,r2,lsr #%i]\n",a,-lsl);
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}
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if ((ea&0x38)==0x18) // (An)+
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{
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@ -168,10 +176,17 @@ int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)
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ot(" sub r%d,r%d,#%d ;@ Pre-decrement An\n",a,a,step);
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if ((ea&0x38)==0x18||(ea&0x38)==0x20)
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{
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if (ea==0x1f||ea==0x27)
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{
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ot(" str r%d,[r7,#0x3c] ;@ A7\n",strr);
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}
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else
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{
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if (lsl>=0) ot(" str r%d,[r7,r2,lsl #%i]\n",strr,lsl);
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else if (lsl<0) ot(" str r%d,[r7,r2,lsr #%i]\n",strr,-lsl);
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}
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}
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if ((ea&0x38)==0x20) Cycles+=size<2 ? 6:10; // -(An) Extra cycles
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else Cycles+=size<2 ? 4:8; // (An),(An)+ Extra cycles
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@ -263,8 +278,8 @@ int EaCalc(int a,int mask,int ea,int size,int top,int sign_extend)
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}
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ot(" ldrh r2,[r4],#2 ;@ Fetch immediate value\n");
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ot(" ldrh r0,[r4],#2\n"); pc_dirty=1;
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ot(" orr r%d,r0,r2,lsl #16\n",a);
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ot(" ldrh r3,[r4],#2\n"); pc_dirty=1;
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ot(" orr r%d,r3,r2,lsl #16\n",a);
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Cycles+=8; // Extra cycles
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return 0;
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}
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@ -298,7 +313,7 @@ int EaRead(int a,int v,int ea,int size,int mask,int top,int sign_extend)
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lsl=2-low; // Having a lsl #2 here saves one opcode
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}
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if (top) nsarm=3;
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if (top||!sign_extend) nsarm=3;
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ot(";@ EaRead : Read register[r%d] into r%d:\n",a,v);
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@ -352,6 +367,43 @@ int EaRead(int a,int v,int ea,int size,int mask,int top,int sign_extend)
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ot("\n"); return 0;
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}
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// calculate EA and read
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// if (ea < 0x10) nothing is trashed
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// if (ea == 0x3c) r2 and r3 are trashed
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// else r0-r3 are trashed
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// size values 0, 1, 2 ~ byte, word, long
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// r_ea is reg to store ea in (-1 means ea is not needed), r is dst reg
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// if sign_extend is 0, non-32bit values will have MS bits undefined
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int EaCalcRead(int r_ea,int r,int ea,int size,int mask,int sign_extend)
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{
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if (ea<0x10)
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{
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if (r_ea==-1)
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{
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r_ea=r;
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if (!sign_extend) size=2;
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}
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}
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else if (ea==0x3c) // #imm
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{
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r_ea=r;
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}
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else
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{
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if (r_ea==-1) r_ea=0;
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}
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EaCalc (r_ea,mask,ea,size,0,sign_extend);
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EaRead (r_ea, r,ea,size,mask,0,sign_extend);
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return 0;
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}
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int EaCalcReadNoSE(int r_ea,int r,int ea,int size,int mask)
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{
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return EaCalcRead(r_ea,r,ea,size,mask,0);
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}
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// Return 1 if we can read this ea
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int EaCanRead(int ea,int size)
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{
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@ -277,6 +277,7 @@ static void PrintFramework()
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ot(" bx lr\n");
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ot("\n");
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#endif
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// 68k: XNZVC, ARM: NZCV
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if (ms) ot("CycloneSetSr\n");
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else ot("CycloneSetSr:\n");
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ot(" mov r2,r1,lsr #8\n");
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@ -291,8 +292,8 @@ static void PrintFramework()
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ot(" str r3,[r0,#0x3C]\n");
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ot(" str r2,[r0,#0x48]\n");
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ot("setsr_noswap%s\n",ms?"":":");
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ot(" mov r2,r1,lsr #3\n");
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ot(" strb r2,[r0,#0x45] ;@ the X flag\n");
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ot(" mov r2,r1,lsl #25\n");
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ot(" str r2,[r0,#0x4c] ;@ the X flag\n");
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ot(" bic r2,r1,#0xf3\n");
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ot(" tst r1,#1\n");
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ot(" orrne r2,r2,#2\n");
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@ -310,8 +311,8 @@ static void PrintFramework()
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ot(" orrne r2,r2,#2\n");
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ot(" tst r1,#2\n");
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ot(" orrne r2,r2,#1\n");
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ot(" ldrb r1,[r0,#0x45] ;@ the X flag\n");
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ot(" tst r1,#2\n");
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ot(" ldr r1,[r0,#0x4c] ;@ the X flag\n");
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ot(" tst r1,#0x20000000\n");
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ot(" orrne r2,r2,#0x10\n");
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ot(" ldrb r1,[r0,#0x44] ;@ the SR high\n");
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ot(" orr r0,r2,r1,lsl #8\n");
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@ -418,7 +419,11 @@ int MemHandler(int type,int size,int addrreg)
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addrreg=0;
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#endif
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if (addrreg != 0)
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{
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ot(" add lr,pc,#4\n"); // helps to prevent interlocks
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ot(" mov r0,r%i\n", addrreg);
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}
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else
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ot(" mov lr,pc\n");
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ot(" ldr pc,[r7,#0x%x] ;@ Call ",func);
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@ -473,6 +478,7 @@ static void PrintOpcodes()
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ot(" mov r0,#0x10\n");
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ot(" bl Exception\n");
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#endif
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ot("\n");
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Cycles=34;
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OpEnd();
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@ -499,6 +505,7 @@ static void PrintOpcodes()
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ot(" mov r0,#0x28\n");
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ot(" bl Exception\n");
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#endif
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ot("\n");
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Cycles=4;
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OpEnd();
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@ -524,6 +531,7 @@ static void PrintOpcodes()
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ot(" mov r0,#0x2c\n");
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ot(" bl Exception\n");
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#endif
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ot("\n");
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Cycles=4;
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OpEnd();
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@ -57,11 +57,11 @@ void OpEnd(int sea, int tea)
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ot("\n");
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}
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int OpBase(int op,int sepa)
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int OpBase(int op,int size,int sepa)
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{
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int ea=op&0x3f; // Get Effective Address
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if (ea<0x10) return sepa?(op&~0x7):(op&~0xf); // Use 1 handler for d0-d7 and a0-a7
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if (ea>=0x18 && ea<0x28 && (ea&7)==7) return op; // Specific handler for (a7)+ and -(a7)
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if (size==0&&(ea==0x1f || ea==0x27)) return op; // Specific handler for (a7)+ and -(a7)
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if (ea<0x38) return op&~7; // Use 1 handler for (a0)-(a7), etc...
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return op;
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}
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@ -79,57 +79,65 @@ int OpGetFlags(int subtract,int xbit,int specialz)
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if (xbit)
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{
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ot(" mov r2,r9,lsr #28\n");
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ot(" strb r2,[r7,#0x45] ;@ Save X bit\n");
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ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
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}
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return 0;
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}
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// -----------------------------------------------------------------
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int g_op;
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void OpAny(int op)
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{
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memset(OpData,0x33,sizeof(OpData));
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OpData[0]=(unsigned char)(op>>8);
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OpData[1]=(unsigned char)op;
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g_op=op;
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if ((op&0xf100)==0x0000) OpArith(op);
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if ((op&0xc000)==0x0000) OpMove(op);
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if ((op&0xf5bf)==0x003c) OpArithSr(op); // Ori/Andi/Eori $nnnn,sr
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if ((op&0xf100)==0x0100) OpBtstReg(op);
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if ((op&0xf138)==0x0108) OpMovep(op);
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if ((op&0xff00)==0x0800) OpBtstImm(op);
|
||||
if ((op&0xf900)==0x4000) OpNeg(op);
|
||||
if ((op&0xf140)==0x4100) OpChk(op);
|
||||
if ((op&0xf1c0)==0x41c0) OpLea(op);
|
||||
if ((op&0xf9c0)==0x40c0) OpMoveSr(op);
|
||||
if ((op&0xffc0)==0x4800) OpNbcd(op);
|
||||
if ((op&0xfff8)==0x4840) OpSwap(op);
|
||||
if ((op&0xffc0)==0x4840) OpPea(op);
|
||||
if ((op&0xffb8)==0x4880) OpExt(op);
|
||||
if ((op&0xfb80)==0x4880) OpMovem(op);
|
||||
if ((op&0xff00)==0x4a00) OpTst(op);
|
||||
if ((op&0xffc0)==0x4ac0) OpTas(op);
|
||||
if ((op&0xfff0)==0x4e40) OpTrap(op);
|
||||
if ((op&0xfff8)==0x4e50) OpLink(op);
|
||||
if ((op&0xfff8)==0x4e58) OpUnlk(op);
|
||||
if ((op&0xfff0)==0x4e60) OpMoveUsp(op);
|
||||
if ((op&0xfff8)==0x4e70) Op4E70(op); // Reset/Rts etc
|
||||
if ((op&0xfffd)==0x4e70) OpStopReset(op);
|
||||
if ((op&0xff80)==0x4e80) OpJsr(op);
|
||||
if ((op&0xf000)==0x5000) OpAddq(op);
|
||||
if ((op&0xf0c0)==0x50c0) OpSet(op);
|
||||
if ((op&0xf0f8)==0x50c8) OpDbra(op);
|
||||
if ((op&0xf000)==0x6000) OpBranch(op);
|
||||
if ((op&0xf100)==0x7000) OpMoveq(op);
|
||||
if ((op&0xa000)==0x8000) OpArithReg(op); // Or/Sub/And/Add
|
||||
if ((op&0xb1f0)==0x8100) OpAbcd(op);
|
||||
if ((op&0xb0c0)==0x80c0) OpMul(op);
|
||||
if ((op&0x90c0)==0x90c0) OpAritha(op);
|
||||
if ((op&0xb130)==0x9100) OpAddx(op);
|
||||
if ((op&0xf000)==0xb000) OpCmpEor(op);
|
||||
if ((op&0xf138)==0xb108) OpCmpm(op);
|
||||
if ((op&0xf130)==0xc100) OpExg(op);
|
||||
if ((op&0xf000)==0xe000) OpAsr(op); // Asr/l/Ror/l etc
|
||||
if ((op&0xf8c0)==0xe0c0) OpAsrEa(op);
|
||||
if ((op&0xf100)==0x0000) OpArith(op); // +
|
||||
if ((op&0xc000)==0x0000) OpMove(op); // +
|
||||
if ((op&0xf5bf)==0x003c) OpArithSr(op); // + Ori/Andi/Eori $nnnn,sr
|
||||
if ((op&0xf100)==0x0100) OpBtstReg(op); // +
|
||||
if ((op&0xf138)==0x0108) OpMovep(op); // +
|
||||
if ((op&0xff00)==0x0800) OpBtstImm(op); // +
|
||||
if ((op&0xf900)==0x4000) OpNeg(op); // +
|
||||
if ((op&0xf140)==0x4100) OpChk(op); // +
|
||||
if ((op&0xf1c0)==0x41c0) OpLea(op); // +
|
||||
if ((op&0xf9c0)==0x40c0) OpMoveSr(op); // +
|
||||
if ((op&0xffc0)==0x4800) OpNbcd(op); // +
|
||||
if ((op&0xfff8)==0x4840) OpSwap(op); // +
|
||||
if ((op&0xffc0)==0x4840) OpPea(op); // +
|
||||
if ((op&0xffb8)==0x4880) OpExt(op); // +
|
||||
if ((op&0xfb80)==0x4880) OpMovem(op); // +
|
||||
if ((op&0xff00)==0x4a00) OpTst(op); // +
|
||||
if ((op&0xffc0)==0x4ac0) OpTas(op); // +
|
||||
if ((op&0xfff0)==0x4e40) OpTrap(op); // +
|
||||
if ((op&0xfff8)==0x4e50) OpLink(op); // +
|
||||
if ((op&0xfff8)==0x4e58) OpUnlk(op); // +
|
||||
if ((op&0xfff0)==0x4e60) OpMoveUsp(op); // +
|
||||
if ((op&0xfff8)==0x4e70) Op4E70(op); // + Reset/Rts etc
|
||||
if ((op&0xfffd)==0x4e70) OpStopReset(op);// +
|
||||
if ((op&0xff80)==0x4e80) OpJsr(op); // +
|
||||
if ((op&0xf000)==0x5000) OpAddq(op); // +
|
||||
if ((op&0xf0c0)==0x50c0) OpSet(op); // +
|
||||
if ((op&0xf0f8)==0x50c8) OpDbra(op); // +
|
||||
if ((op&0xf000)==0x6000) OpBranch(op); // +
|
||||
if ((op&0xf100)==0x7000) OpMoveq(op); // +
|
||||
if ((op&0xa000)==0x8000) OpArithReg(op); // + Or/Sub/And/Add
|
||||
if ((op&0xb1f0)==0x8100) OpAbcd(op); // +
|
||||
if ((op&0xb0c0)==0x80c0) OpMul(op); // +
|
||||
if ((op&0x90c0)==0x90c0) OpAritha(op); // +
|
||||
if ((op&0xb130)==0x9100) OpAddx(op); // +
|
||||
if ((op&0xf000)==0xb000) OpCmpEor(op); // +
|
||||
if ((op&0xf138)==0xb108) OpCmpm(op); // +
|
||||
if ((op&0xf130)==0xc100) OpExg(op); // +
|
||||
if ((op&0xf000)==0xe000) OpAsr(op); // + Asr/l/Ror/l etc
|
||||
if ((op&0xf8c0)==0xe0c0) OpAsrEa(op); // +
|
||||
|
||||
if (op==0xffff)
|
||||
{
|
||||
SuperEnd();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -20,18 +20,16 @@ int OpArith(int op)
|
|||
if (EaCanRead(tea,size)==0) return 1;
|
||||
if (EaCanWrite(tea)==0 || EaAn(tea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op, sea, tea); Cycles=4;
|
||||
|
||||
EaCalc(10,0x0000, sea,size,1);
|
||||
EaCalc(11,0x003f, tea,size,1);
|
||||
EaRead(10, 10, sea,size,0,0,0);
|
||||
EaRead(11, 0, tea,size,0x003f,1);
|
||||
EaCalcReadNoSE((type!=6)?11:-1,0,tea,size,0x003f);
|
||||
EaCalcReadNoSE(-1,10,sea,size,0);
|
||||
|
||||
if (size==0) shiftstr=",asl #24";
|
||||
else if (size==1) shiftstr=",asl #16";
|
||||
if (size<2) shiftstr=(char *)(size?",asl #16":",asl #24");
|
||||
if (size<2) ot(" mov r0,r0,asl %i\n",size?16:24);
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
|
||||
|
|
@ -92,7 +90,7 @@ int OpAddq(int op)
|
|||
if (EaCanWrite(ea) ==0) return 1;
|
||||
if (size == 0 && EaAn(ea) ) return 1;
|
||||
|
||||
use=OpBase(op,1);
|
||||
use=OpBase(op,size,1);
|
||||
|
||||
if (num!=8) use|=0x0e00; // If num is not 8, use same handler
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
|
@ -104,8 +102,7 @@ int OpAddq(int op)
|
|||
|
||||
if (size>0 && (ea&0x38)==0x08) size=2; // addq.w #n,An is also 32-bit
|
||||
|
||||
EaCalc(10,0x003f, ea,size,1);
|
||||
EaRead(10, 0, ea,size,0x003f,1);
|
||||
EaCalcReadNoSE(10,0,ea,size,0x003f);
|
||||
|
||||
shift=32-(8<<size);
|
||||
|
||||
|
|
@ -125,6 +122,8 @@ int OpAddq(int op)
|
|||
sprintf(count,"#0x%.4x",8<<shift);
|
||||
}
|
||||
|
||||
if (size<2) ot(" mov r0,r0,asl #%d\n\n",size?16:24);
|
||||
|
||||
if (type==0) ot(" adds r1,r0,%s\n",count);
|
||||
if (type==1) ot(" subs r1,r0,%s\n",count);
|
||||
|
||||
|
|
@ -144,6 +143,8 @@ int OpArithReg(int op)
|
|||
{
|
||||
int use=0;
|
||||
int type=0,size=0,dir=0,rea=0,ea=0;
|
||||
char *asl="";
|
||||
char *strop=0;
|
||||
|
||||
type=(op>>12)&5;
|
||||
rea =(op>> 9)&7;
|
||||
|
|
@ -158,26 +159,27 @@ int OpArithReg(int op)
|
|||
if (dir && EaCanWrite(ea)==0) return 1;
|
||||
if ((size==0||!(type&1))&&EaAn(ea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use same opcode for Dn
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=4;
|
||||
|
||||
ot(";@ Get r10=EA r11=EA value\n");
|
||||
EaCalc(10,0x003f, ea,size,1);
|
||||
EaRead(10, 11, ea,size,0x003f,1);
|
||||
ot(";@ Get r0=Register r1=Register value\n");
|
||||
EaCalc( 0,0x0e00,rea,size,1);
|
||||
EaRead( 0, 1,rea,size,0x0e00,1);
|
||||
EaCalcReadNoSE(dir?10:-1,0,ea,size,0x003f);
|
||||
|
||||
EaCalcReadNoSE(dir?-1:10,1,rea,size,0x0e00);
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
if (type==0) ot(" orr ");
|
||||
if (type==1) ot(" subs ");
|
||||
if (type==4) ot(" and ");
|
||||
if (type==5) ot(" adds ");
|
||||
if (dir) ot("r1,r11,r1\n");
|
||||
else ot("r1,r1,r11\n");
|
||||
if (type==0) strop = "orr";
|
||||
if (type==1) strop = (char *) (dir ? "subs" : "rsbs");
|
||||
if (type==4) strop = "and";
|
||||
if (type==5) strop = "adds";
|
||||
|
||||
if (size==0) asl=",asl #24";
|
||||
if (size==1) asl=",asl #16";
|
||||
|
||||
if (size<2) ot(" mov r0,r0%s\n",asl);
|
||||
ot(" %s r1,r0,r1%s\n",strop,asl);
|
||||
|
||||
if ((type&1)==0) ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
||||
|
||||
|
|
@ -185,8 +187,9 @@ int OpArithReg(int op)
|
|||
ot("\n");
|
||||
|
||||
ot(";@ Save result:\n");
|
||||
if (dir) EaWrite(10, 1, ea,size,0x003f,1);
|
||||
else EaWrite( 0, 1,rea,size,0x0e00,1);
|
||||
if (size<2) ot(" mov r1,r1,asr #%d\n",size?16:24);
|
||||
if (dir) EaWrite(10, 1, ea,size,0x003f,0,0);
|
||||
else EaWrite(10, 1,rea,size,0x0e00,0,0);
|
||||
|
||||
if(rea==ea) {
|
||||
if(ea<8) Cycles=(size>=2)?8:4; else Cycles+=(size>=2)?26:14;
|
||||
|
|
@ -220,7 +223,7 @@ int OpMul(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(ea,1)==0||EaAn(ea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,1);
|
||||
use&=~0x0e00; // Use same for all registers
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -228,17 +231,17 @@ int OpMul(int op)
|
|||
if(type) Cycles=54;
|
||||
else Cycles=sign?158:140;
|
||||
|
||||
EaCalc(10,0x003f, ea, 1);
|
||||
EaRead(10, 10, ea, 1,0x003f);
|
||||
EaCalcReadNoSE(-1,0,ea,1,0x003f);
|
||||
|
||||
EaCalc (0,0x0e00,rea, 2,1);
|
||||
EaRead (0, 2,rea, 2,0x0e00,1);
|
||||
EaCalc(10,0x0e00,rea, 2);
|
||||
EaRead(10, 2,rea, 2,0x0e00);
|
||||
|
||||
ot(" movs r0,r0,asl #16\n");
|
||||
|
||||
if (type==0) // div
|
||||
{
|
||||
// the manual says C is always cleared, but neither Musashi nor FAME do that
|
||||
//ot(" bic r9,r9,#0x20000000 ;@ always clear C\n");
|
||||
ot(" tst r10,r10\n");
|
||||
ot(" beq divzero%.4x ;@ division by zero\n",op);
|
||||
ot("\n");
|
||||
|
||||
|
|
@ -246,7 +249,8 @@ int OpMul(int op)
|
|||
{
|
||||
ot(" mov r11,#0 ;@ r11 = 1 or 2 if the result is negative\n");
|
||||
ot(" orrmi r11,r11,#1\n");
|
||||
ot(" rsbmi r10,r10,#0 ;@ Make r10 positive\n");
|
||||
ot(" mov r0,r0,asr #16\n");
|
||||
ot(" rsbmi r0,r0,#0 ;@ Make r0 positive\n");
|
||||
ot("\n");
|
||||
ot(" tst r2,r2\n");
|
||||
ot(" orrmi r11,r11,#2\n");
|
||||
|
|
@ -255,13 +259,12 @@ int OpMul(int op)
|
|||
}
|
||||
else
|
||||
{
|
||||
ot(" mov r10,r10,lsl #16 ;@ use only 16 bits of divisor\n");
|
||||
ot(" mov r10,r10,lsr #16\n");
|
||||
ot(" mov r0,r0,lsr #16 ;@ use only 16 bits of divisor\n");
|
||||
}
|
||||
|
||||
ot(";@ Divide r2 by r10\n");
|
||||
ot(";@ Divide r2 by r0\n");
|
||||
ot(" mov r3,#0\n");
|
||||
ot(" mov r1,r10\n");
|
||||
ot(" mov r1,r0\n");
|
||||
ot("\n");
|
||||
ot(";@ Shift up divisor till it's just less than numerator\n");
|
||||
ot("Shift%.4x%s\n",op,ms?"":":");
|
||||
|
|
@ -274,7 +277,7 @@ int OpMul(int op)
|
|||
ot(" cmp r2,r1\n");
|
||||
ot(" adc r3,r3,r3 ;@ Double r3 and add 1 if carry set\n");
|
||||
ot(" subcs r2,r2,r1\n");
|
||||
ot(" teq r1,r10\n");
|
||||
ot(" teq r1,r0\n");
|
||||
ot(" movne r1,r1,lsr #1\n");
|
||||
ot(" bne Divide%.4x\n",op);
|
||||
ot("\n");
|
||||
|
|
@ -314,33 +317,32 @@ int OpMul(int op)
|
|||
|
||||
if (type==1)
|
||||
{
|
||||
char *shift="asr";
|
||||
|
||||
ot(";@ Get 16-bit signs right:\n");
|
||||
if (sign==0) { ot(" mov r10,r10,lsl #16\n"); shift="lsr"; }
|
||||
ot(" mov r0,r0,%s #16\n",sign?"asr":"lsr");
|
||||
ot(" mov r2,r2,lsl #16\n");
|
||||
|
||||
if (sign==0) ot(" mov r10,r10,lsr #16\n");
|
||||
ot(" mov r2,r2,%s #16\n",shift);
|
||||
ot(" mov r2,r2,%s #16\n",sign?"asr":"lsr");
|
||||
ot("\n");
|
||||
|
||||
ot(" mul r1,r2,r10\n");
|
||||
ot(" mul r1,r2,r0\n");
|
||||
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
||||
OpGetFlags(0,0);
|
||||
}
|
||||
ot("\n");
|
||||
|
||||
EaWrite(0, 1,rea, 2,0x0e00,1);
|
||||
EaWrite(10, 1,rea, 2,0x0e00,1);
|
||||
|
||||
ot("endofop%.4x%s\n",op,ms?"":":");
|
||||
if (type==0) ot("endofop%.4x%s\n",op,ms?"":":");
|
||||
OpEnd(ea);
|
||||
|
||||
if (type==0) // div
|
||||
{
|
||||
ot("divzero%.4x%s\n",op,ms?"":":");
|
||||
ot(" mov r0,#0x14 ;@ Divide by zero\n");
|
||||
ot(" bl Exception\n");
|
||||
Cycles+=38;
|
||||
OpEnd(ea);
|
||||
ot("\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -349,9 +351,8 @@ int OpMul(int op)
|
|||
int GetXBit(int subtract)
|
||||
{
|
||||
ot(";@ Get X bit:\n");
|
||||
ot(" ldrb r2,[r7,#0x45]\n");
|
||||
if (subtract) ot(" mvn r2,r2,lsl #28 ;@ Invert it\n");
|
||||
else ot(" mov r2,r2,lsl #28\n");
|
||||
ot(" ldr r2,[r7,#0x4c]\n");
|
||||
if (subtract) ot(" mvn r2,r2 ;@ Invert it\n");
|
||||
ot(" msr cpsr_flg,r2 ;@ Get into Carry\n");
|
||||
ot("\n");
|
||||
return 0;
|
||||
|
|
@ -362,34 +363,46 @@ int GetXBit(int subtract)
|
|||
int OpAbcd(int op)
|
||||
{
|
||||
int use=0;
|
||||
int type=0,sea=0,addr=0,dea=0;
|
||||
int type=0,sea=0,mem=0,dea=0;
|
||||
|
||||
type=(op>>14)&1; // sbcd/abcd
|
||||
dea =(op>> 9)&7;
|
||||
addr=(op>> 3)&1;
|
||||
mem =(op>> 3)&1;
|
||||
sea = op &7;
|
||||
|
||||
if (addr) { sea|=0x20; dea|=0x20; }
|
||||
if (mem) { sea|=0x20; dea|=0x20; }
|
||||
|
||||
use=op&~0x0e07; // Use same opcode for all registers..
|
||||
if (sea==0x27||dea==0x27) use=op; // ..except -(a7)
|
||||
if (sea==0x27) use|=0x0007; // ___x.b -(a7)
|
||||
if (dea==0x27) use|=0x0e00; // ___x.b -(a7)
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea,dea); Cycles=6;
|
||||
|
||||
EaCalc( 0,0x0007, sea,0,1);
|
||||
EaRead( 0, 10, sea,0,0x0007,1);
|
||||
EaCalc(11,0x0e00, dea,0,1);
|
||||
EaRead(11, 1, dea,0,0x0e00,1);
|
||||
if (mem)
|
||||
{
|
||||
ot(";@ Get src/dest EA vals\n");
|
||||
EaCalc (0,0x000f, sea,0,1);
|
||||
EaRead (0, 10, sea,0,0x000f,1);
|
||||
EaCalcReadNoSE(11,0,dea,0,0x1e00);
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(";@ Get src/dest reg vals\n");
|
||||
EaCalcReadNoSE(-1,10,sea,0,0x0007);
|
||||
EaCalcReadNoSE(11,0,dea,0,0x0e00);
|
||||
ot(" mov r10,r10,asl #24\n");
|
||||
}
|
||||
ot(" mov r1,r0,asl #24\n\n");
|
||||
|
||||
ot(" bic r9,r9,#0xb1000000 ;@ clear all flags except old Z\n");
|
||||
|
||||
if (type)
|
||||
{
|
||||
ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");
|
||||
ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
|
||||
ot(" mov r3,#0x00f00000\n");
|
||||
ot(" and r2,r3,r1,lsr #4\n");
|
||||
ot(" tst r0,#2\n");
|
||||
ot(" tst r0,#0x20000000\n");
|
||||
ot(" and r0,r3,r10,lsr #4\n");
|
||||
ot(" add r0,r0,r2\n");
|
||||
ot(" addne r0,r0,#0x00100000\n");
|
||||
|
|
@ -413,10 +426,10 @@ int OpAbcd(int op)
|
|||
}
|
||||
else
|
||||
{
|
||||
ot(" ldrb r0,[r7,#0x45] ;@ Get X bit\n");
|
||||
ot(" ldr r0,[r7,#0x4c] ;@ Get X bit\n");
|
||||
ot(" mov r3,#0x00f00000\n");
|
||||
ot(" and r2,r3,r10,lsr #4\n");
|
||||
ot(" tst r0,#2\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");
|
||||
|
|
@ -439,8 +452,8 @@ int OpAbcd(int op)
|
|||
ot(" bicne r9,r9,#0x40000000 ;@ Z flag\n");
|
||||
}
|
||||
|
||||
ot(" mov r2,r9,lsr #28\n");
|
||||
ot(" strb r2,[r7,#0x45] ;@ Save X bit\n");
|
||||
ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
|
||||
ot("\n");
|
||||
|
||||
EaWrite(11, 0, dea,0,0x0e00,1);
|
||||
OpEnd(sea,dea);
|
||||
|
|
@ -448,7 +461,7 @@ int OpAbcd(int op)
|
|||
return 0;
|
||||
}
|
||||
|
||||
// 01008000 00eeeeee - nbcd <ea>
|
||||
// 01001000 00eeeeee - nbcd <ea>
|
||||
int OpNbcd(int op)
|
||||
{
|
||||
int use=0;
|
||||
|
|
@ -458,23 +471,22 @@ int OpNbcd(int op)
|
|||
|
||||
if(EaCanWrite(ea)==0||EaAn(ea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
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;
|
||||
|
||||
EaCalc(10,0x3f, ea,0,1);
|
||||
EaRead(10, 0, ea,0,0x3f,1);
|
||||
EaCalcReadNoSE(10,0,ea,0,0x003f);
|
||||
|
||||
// this is rewrite of Musashi's code
|
||||
ot(" ldrb r2,[r7,#0x45]\n");
|
||||
ot(" tst r2,#2\n");
|
||||
ot(" mov r2,r0\n");
|
||||
ot(" addne r2,r0,#0x01000000 ;@ add X\n");
|
||||
ot(" ldr r2,[r7,#0x4c]\n");
|
||||
ot(" bic r9,r9,#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(" rsbs r1,r2,#0x9a000000 ;@ do arithmetic\n");
|
||||
|
||||
ot(" bic r9,r9,#0xb0000000 ;@ clear all flags, except Z\n");
|
||||
ot(" orrmi r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" cmp r1,#0x9a000000\n");
|
||||
ot(" beq finish%.4x\n",op);
|
||||
|
|
@ -495,8 +507,7 @@ int OpNbcd(int op)
|
|||
EaWrite(10, 1, ea,0,0x3f,1);
|
||||
|
||||
ot("finish%.4x%s\n",op,ms?"":":");
|
||||
ot(" mov r2,r9,lsr #28\n");
|
||||
ot(" strb r2, [r7,#0x45]\n");
|
||||
ot(" str r9,[r7,#0x4c] ;@ Save X\n");
|
||||
|
||||
OpEnd(ea);
|
||||
|
||||
|
|
@ -509,6 +520,7 @@ int OpAritha(int op)
|
|||
{
|
||||
int use=0;
|
||||
int type=0,size=0,sea=0,dea=0;
|
||||
char *asr="";
|
||||
|
||||
// Suba/Cmpa/Adda/(invalid):
|
||||
type=(op>>13)&3; if (type>=3) return 1;
|
||||
|
|
@ -520,7 +532,7 @@ int OpAritha(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(sea,size)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use same opcode for An
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -528,18 +540,19 @@ int OpAritha(int op)
|
|||
if(size==2&&(sea<0x10||sea==0x3c)) Cycles+=2;
|
||||
if(type==1) Cycles=6;
|
||||
|
||||
|
||||
// must calculate reg EA first, because of situations like: suba.w (A0)+, A0
|
||||
EaCalc (10,0x0e00, dea,2,1);
|
||||
EaRead (10, 11, dea,2,0x0e00);
|
||||
EaCalc (10,0x1e00, dea,2,1);
|
||||
EaRead (10, 11, dea,2,0x1e00);
|
||||
|
||||
EaCalc ( 0,0x003f, sea,size);
|
||||
EaRead ( 0, 0, sea,size,0x003f);
|
||||
EaCalc ( 0,0x003f, sea,size,1);
|
||||
EaRead ( 0, 0, sea,size,0x003f,1);
|
||||
|
||||
if (type==0) ot(" sub r11,r11,r0\n");
|
||||
if (type==1) ot(" cmp r11,r0 ;@ Defines NZCV\n");
|
||||
if (size<2) asr=(char *)(size?",asr #16":",asr #24");
|
||||
|
||||
if (type==0) ot(" sub r11,r11,r0%s\n",asr);
|
||||
if (type==1) ot(" cmp r11,r0%s ;@ Defines NZCV\n",asr);
|
||||
if (type==1) OpGetFlags(1,0); // Get Cmp flags
|
||||
if (type==2) ot(" add r11,r11,r0\n");
|
||||
if (type==2) ot(" add r11,r11,r0%s\n",asr);
|
||||
ot("\n");
|
||||
|
||||
if (type!=1) EaWrite(10, 11, dea,2,0x0e00,1);
|
||||
|
|
@ -555,8 +568,9 @@ int OpAddx(int op)
|
|||
{
|
||||
int use=0;
|
||||
int type=0,size=0,dea=0,sea=0,mem=0;
|
||||
char *asl="";
|
||||
|
||||
type=(op>>12)&5;
|
||||
type=(op>>14)&1;
|
||||
dea =(op>> 9)&7;
|
||||
size=(op>> 6)&3; if (size>=3) return 1;
|
||||
sea = op&7;
|
||||
|
|
@ -569,24 +583,35 @@ int OpAddx(int op)
|
|||
if(mem) { sea+=0x20; dea+=0x20; }
|
||||
|
||||
use=op&~0x0e07; // Use same opcode for Dn
|
||||
if (size==0&&(sea==0x27||dea==0x27)) use=op; // ___x.b -(a7)
|
||||
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;
|
||||
|
||||
ot(";@ Get r10=EA r11=EA value\n");
|
||||
EaCalc( 0,0x0007,sea,size,1);
|
||||
EaRead( 0, 11,sea,size,0x0007,1);
|
||||
ot(";@ Get r0=Register r1=Register value\n");
|
||||
EaCalc( 0,0x0e00,dea,size,1);
|
||||
EaRead( 0, 1,dea,size,0x0e00,1);
|
||||
if (mem)
|
||||
{
|
||||
ot(";@ Get src/dest EA vals\n");
|
||||
EaCalc (0,0x000f, sea,size,1);
|
||||
EaRead (0, 11, sea,size,0x000f,1);
|
||||
EaCalcReadNoSE(10,0,dea,size,0x1e00);
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(";@ Get src/dest reg vals\n");
|
||||
EaCalcReadNoSE(-1,11,sea,size,0x0007);
|
||||
EaCalcReadNoSE(10,0,dea,size,0x0e00);
|
||||
if (size<2) ot(" mov r11,r11,asl #%d\n\n",size?16:24);
|
||||
}
|
||||
|
||||
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
GetXBit(type==1);
|
||||
GetXBit(type==0);
|
||||
|
||||
if (type==5 && size<2)
|
||||
if (type==1 && size<2)
|
||||
{
|
||||
ot(";@ Make sure the carry bit will tip the balance:\n");
|
||||
ot(" mvn r2,#0\n");
|
||||
|
|
@ -594,10 +619,10 @@ int OpAddx(int op)
|
|||
ot("\n");
|
||||
}
|
||||
|
||||
if (type==1) ot(" sbcs r1,r1,r11\n");
|
||||
if (type==5) ot(" adcs r1,r1,r11\n");
|
||||
if (type==0) ot(" rscs r1,r11,r0%s\n",asl);
|
||||
if (type==1) ot(" adcs r1,r11,r0%s\n",asl);
|
||||
ot(" orr r3,r9,#0xb0000000 ;@ for old Z\n");
|
||||
OpGetFlags(type==1,1,0); // subtract
|
||||
OpGetFlags(type==0,1,0); // subtract
|
||||
if (size<2) {
|
||||
ot(" movs r2,r1,lsr #%i\n", size?16:24);
|
||||
ot(" orreq r9,r9,#0x40000000 ;@ add potentially missed Z\n");
|
||||
|
|
@ -606,7 +631,7 @@ int OpAddx(int op)
|
|||
ot("\n");
|
||||
|
||||
ot(";@ Save result:\n");
|
||||
EaWrite( 0, 1, dea,size,0x0e00,1);
|
||||
EaWrite(10, 1, dea,size,0x0e00,1);
|
||||
|
||||
OpEnd(sea,dea);
|
||||
|
||||
|
|
@ -619,6 +644,7 @@ int OpCmpEor(int op)
|
|||
{
|
||||
int rea=0,eor=0;
|
||||
int size=0,ea=0,use=0;
|
||||
char *asl="";
|
||||
|
||||
// Get EA and register EA
|
||||
rea=(op>>9)&7;
|
||||
|
|
@ -633,7 +659,7 @@ int OpCmpEor(int op)
|
|||
if (eor && EaCanWrite(ea)==0) return 1;
|
||||
if (EaAn(ea)&&(eor||size==0)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use 1 handler for register d0-7
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -646,18 +672,19 @@ int OpCmpEor(int op)
|
|||
}
|
||||
|
||||
ot(";@ Get EA into r10 and value into r0:\n");
|
||||
EaCalc (10,0x003f, ea,size,1);
|
||||
EaRead (10, 0, ea,size,0x003f,1);
|
||||
EaCalcReadNoSE(eor?10:-1,0,ea,size,0x003f);
|
||||
|
||||
ot(";@ Get register operand into r1:\n");
|
||||
EaCalc (1, 0x0e00, rea,size,1);
|
||||
EaRead (1, 1, rea,size,0x0e00,1);
|
||||
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(" cmp r1,r0\n");
|
||||
if (eor==0) ot(" rsbs r1,r0,r1%s\n",asl);
|
||||
if (eor)
|
||||
{
|
||||
ot(" eor r1,r0,r1\n");
|
||||
ot(" eor r1,r0,r1%s\n",asl);
|
||||
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
||||
}
|
||||
|
||||
|
|
@ -674,6 +701,7 @@ int OpCmpEor(int op)
|
|||
int OpCmpm(int op)
|
||||
{
|
||||
int size=0,sea=0,dea=0,use=0;
|
||||
char *asl="";
|
||||
|
||||
// get size, get EAs
|
||||
size=(op>>6)&3; if (size>=3) return 1;
|
||||
|
|
@ -681,21 +709,24 @@ int OpCmpm(int op)
|
|||
dea=(op>>9)&0x3f;
|
||||
|
||||
use=op&~0x0e07; // Use 1 handler for all registers..
|
||||
if (size==0&&(sea==0x1f||dea==0x1f)) use=op; // ..except (a7)+
|
||||
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 r10:\n");
|
||||
EaCalc (0,0x000f, sea,size,1);
|
||||
EaCalc (0,0x1e00, sea,size,1);
|
||||
EaRead (0, 10, sea,size,0x000f,1);
|
||||
|
||||
ot(";@ Get dst operand into r0:\n");
|
||||
EaCalc (0,0x1e00, dea,size,1);
|
||||
EaRead (0, 0, dea,size,0x1e00,1);
|
||||
EaCalcReadNoSE(-1,0,dea,size,0x1e00);
|
||||
|
||||
ot(" cmp r0,r10\n");
|
||||
if (size<2) asl=(char *)(size?",asl #16":",asl #24");
|
||||
|
||||
ot(" rsbs r0,r10,r0%s\n",asl);
|
||||
OpGetFlags(1,0); // Cmp like subtract
|
||||
ot("\n");
|
||||
|
||||
OpEnd(sea);
|
||||
return 0;
|
||||
|
|
@ -721,19 +752,20 @@ int OpChk(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(ea,size)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
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 EA into r10 and value into r0:\n");
|
||||
EaCalc (10,0x003f, ea,size,1);
|
||||
EaRead (10, 0, ea,size,0x003f,1);
|
||||
EaCalcReadNoSE(-1,0,ea,size,0x003f);
|
||||
|
||||
ot(";@ Get register operand into r1:\n");
|
||||
EaCalc (1, 0x0e00, rea,size,1);
|
||||
EaRead (1, 1, rea,size,0x0e00,1);
|
||||
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,r9,#0x80000000\n");
|
||||
|
|
@ -744,12 +776,11 @@ int OpChk(int op)
|
|||
ot(" bmi chktrap%.4x\n",op);
|
||||
|
||||
ot(";@ Do arithmetic:\n");
|
||||
ot(" bic r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" cmp r1,r0\n");
|
||||
ot(" bicgt r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" bgt chktrap%.4x\n",op);
|
||||
|
||||
ot(";@ old N remains\n");
|
||||
ot(" bic r9,r9,#0x80000000 ;@ N\n");
|
||||
ot(" orr r9,r9,r3\n");
|
||||
OpEnd(ea);
|
||||
|
||||
|
|
|
|||
|
|
@ -139,8 +139,8 @@ int OpUnlk(int op)
|
|||
OpStart(op,0x10);
|
||||
|
||||
ot(";@ Get An\n");
|
||||
EaCalc(10, 7, 8, 2, 1);
|
||||
EaRead(10, 0, 8, 2, 7, 1);
|
||||
EaCalc(10, 0xf, 8, 2, 1);
|
||||
EaRead(10, 0, 8, 2, 0xf, 1);
|
||||
|
||||
ot(" add r11,r0,#4 ;@ A7+=4\n");
|
||||
ot("\n");
|
||||
|
|
@ -181,7 +181,6 @@ int Op4E70(int op)
|
|||
SuperChange(op);
|
||||
CheckInterrupt(op);
|
||||
OpEnd(0x10);
|
||||
SuperEnd(op);
|
||||
return 0;
|
||||
|
||||
case 5: // rts
|
||||
|
|
@ -225,7 +224,7 @@ int OpJsr(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanRead(sea,-1)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,0);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,(op&0x40)?0:0x10);
|
||||
|
|
@ -294,17 +293,17 @@ int OpDbra(int op)
|
|||
break;
|
||||
case 2: // hi
|
||||
ot(" tst r9,#0x60000000 ;@ hi: !C && !Z\n");
|
||||
ot(" beq DbraTrue%.4x\n\n",op);
|
||||
ot(" beq DbraTrue\n\n");
|
||||
break;
|
||||
case 3: // ls
|
||||
ot(" tst r9,#0x60000000 ;@ ls: C || Z\n");
|
||||
ot(" bne DbraTrue%.4x\n\n",op);
|
||||
ot(" bne DbraTrue\n\n");
|
||||
break;
|
||||
default:
|
||||
ot(";@ Is the condition true?\n");
|
||||
ot(" msr cpsr_flg,r9 ;@ ARM flags = 68000 flags\n");
|
||||
ot(";@ If so, don't dbra\n");
|
||||
ot(" b%s DbraTrue%.4x\n\n",Cond[cc],op);
|
||||
ot(" b%s DbraTrue\n\n",Cond[cc]);
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
@ -332,10 +331,11 @@ int OpDbra(int op)
|
|||
OpEnd();
|
||||
}
|
||||
|
||||
if (cc==0||cc>=2)
|
||||
//if (cc==0||cc>=2)
|
||||
if (op==0x50c8)
|
||||
{
|
||||
ot(";@ condition true:\n");
|
||||
ot("DbraTrue%.4x%s\n", op, ms?"":":");
|
||||
ot("DbraTrue%s\n", ms?"":":");
|
||||
ot(" add r4,r4,#2 ;@ Skip branch offset\n");
|
||||
ot("\n");
|
||||
Cycles=12;
|
||||
|
|
@ -352,6 +352,7 @@ int OpBranch(int op)
|
|||
int size=0,use=0;
|
||||
int offset=0;
|
||||
int cc=0;
|
||||
char *asr_r11="";
|
||||
|
||||
offset=(char)(op&0xff);
|
||||
cc=(op>>8)&15;
|
||||
|
|
@ -365,33 +366,48 @@ int OpBranch(int op)
|
|||
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
OpStart(op,size?0x10:0);
|
||||
|
||||
ot(";@ Get Branch offset:\n");
|
||||
if (size)
|
||||
{
|
||||
EaCalc(0,0,0x3c,size);
|
||||
EaRead(0,0,0x3c,size,0);
|
||||
}
|
||||
else
|
||||
ot(" mov r0,r8,asl #24 ;@ Shift 8-bit signed offset up...\n\n");
|
||||
|
||||
// above code messes cycles
|
||||
Cycles=10; // Assume branch taken
|
||||
|
||||
if (cc==1) ot(" ldr r10,[r7,#0x60] ;@ Get Memory base\n");
|
||||
|
||||
if (cc>=2)
|
||||
switch (cc)
|
||||
{
|
||||
case 0: // T
|
||||
case 1: // F
|
||||
break;
|
||||
case 2: // hi
|
||||
ot(" tst r9,#0x60000000 ;@ hi: !C && !Z\n");
|
||||
ot(" bne BccDontBranch%i\n\n",8<<size);
|
||||
break;
|
||||
case 3: // ls
|
||||
ot(" tst r9,#0x60000000 ;@ ls: C || Z\n");
|
||||
ot(" beq BccDontBranch%i\n\n",8<<size);
|
||||
break;
|
||||
default:
|
||||
ot(";@ Is the condition true?\n");
|
||||
if ((cc&~1)==2) ot(" eor r9,r9,#0x20000000 ;@ Invert carry for hi/ls\n");
|
||||
ot(" msr cpsr_flg,r9 ;@ ARM flags = 68000 flags\n");
|
||||
if ((cc&~1)==2) ot(" eor r9,r9,#0x20000000\n");
|
||||
|
||||
ot(" b%s DontBranch%.4x\n",Cond[cc^1],op);
|
||||
ot("\n");
|
||||
ot(" b%s BccDontBranch%i\n\n",Cond[cc^1],8<<size);
|
||||
break;
|
||||
}
|
||||
|
||||
if (size==0) ot(" mov r0,r0,asr #24 ;@ ...shift down\n\n");
|
||||
if (size)
|
||||
{
|
||||
if (size<2)
|
||||
{
|
||||
ot(" ldrsh r11,[r4] ;@ Fetch Branch offset\n");
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(" ldrh r2,[r4] ;@ Fetch Branch offset\n");
|
||||
ot(" ldrh r11,[r4,#2]\n");
|
||||
ot(" orr r11,r11,r2,lsl #16\n");
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(" mov r11,r8,asl #24 ;@ Shift 8-bit signed offset up...\n\n");
|
||||
asr_r11=",asr #24";
|
||||
}
|
||||
|
||||
ot(";@ Branch taken - Add on r0 to PC\n");
|
||||
|
||||
|
|
@ -399,12 +415,11 @@ int OpBranch(int op)
|
|||
{
|
||||
ot(";@ Bsr - remember old PC\n");
|
||||
ot(" sub r1,r4,r10 ;@ r1 = Old PC\n");
|
||||
if (size) ot(" add r1,r1,#%d\n",1<<size);
|
||||
ot(" mov r1,r1, lsl #8\n");
|
||||
ot(" ldr r2,[r7,#0x3c]\n");
|
||||
ot(" mov r1,r1, asr #8\n");
|
||||
ot("\n");
|
||||
if (size) ot(" sub r4,r4,#%d ;@ (Branch is relative to Opcode+2)\n",1<<size);
|
||||
ot(" ldr r2,[r7,#0x3c]\n");
|
||||
ot(" add r4,r4,r0 ;@ r4 = New PC\n");
|
||||
ot(";@ Push r1 onto stack\n");
|
||||
ot(" sub r0,r2,#4 ;@ Predecrement A7\n");
|
||||
ot(" str r0,[r7,#0x3c] ;@ Save A7\n");
|
||||
|
|
@ -414,33 +429,36 @@ int OpBranch(int op)
|
|||
if (offset==0 || offset==-1)
|
||||
{
|
||||
ot(";@ Branch is quite far, so may be a good idea to check Memory Base+pc\n");
|
||||
CheckPc(4);
|
||||
ot(" add r0,r4,r11%s ;@ r4 = New PC\n",asr_r11);
|
||||
CheckPc(0);
|
||||
}
|
||||
else
|
||||
ot(" add r4,r4,r11%s ;@ r4 = New PC\n",asr_r11);
|
||||
}
|
||||
else
|
||||
{
|
||||
if (size) ot(" sub r4,r4,#%d ;@ (Branch is relative to Opcode+2)\n",1<<size);
|
||||
if (offset==0 || offset==-1)
|
||||
{
|
||||
ot(" add r0,r4,r0 ;@ r4 = New PC\n");
|
||||
ot(" add r0,r4,r11%s ;@ r4 = New PC\n",asr_r11);
|
||||
ot(";@ Branch is quite far, so may be a good idea to check Memory Base+pc\n");
|
||||
CheckPc(0);
|
||||
}
|
||||
else
|
||||
{
|
||||
ot(" add r4,r4,r0 ;@ r4 = New PC\n");
|
||||
ot(" add r4,r4,r11%s ;@ r4 = New PC\n",asr_r11);
|
||||
ot("\n");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
OpEnd(size?0x10:0);
|
||||
|
||||
if (cc>=2)
|
||||
// since all "DontBranch" code is same for every size, output only once
|
||||
if (cc>=2&&(op&0xff00)==0x6200)
|
||||
{
|
||||
ot("DontBranch%.4x%s\n", op, ms?"":":");
|
||||
Cycles+=(size==1)? 2 : -2; // Branch not taken
|
||||
OpEnd(size?0x10:0);
|
||||
ot("BccDontBranch%i%s\n", 8<<size, ms?"":":");
|
||||
if (size) ot(" add r4,r4,#%d\n",8<<size);
|
||||
Cycles+=(size==1) ? 2 : -2; // Branch not taken
|
||||
OpEnd(0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -23,7 +23,7 @@ int OpBtstReg(int op)
|
|||
if (EaCanWrite(tea)==0) return 1;
|
||||
}
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
use&=~0x0e00; // Use same handler for all registers
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
|
|
@ -36,13 +36,9 @@ int OpBtstReg(int op)
|
|||
if(size>=2) Cycles+=2;
|
||||
}
|
||||
|
||||
EaCalc (10,0x0e00,sea,0,0,0);
|
||||
EaRead (10, 10,sea,0,0x0e00,0,0);
|
||||
EaCalcReadNoSE(-1,10,sea,0,0x0e00);
|
||||
|
||||
EaCalc ( 0,0x003f,tea,size,0,0);
|
||||
if (type>0)
|
||||
ot(" mov r11,r0\n");
|
||||
EaRead ( 0, 0,tea,size,0x003f,0,0);
|
||||
EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);
|
||||
|
||||
if (tea>=0x10)
|
||||
ot(" and r10,r10,#7 ;@ mem - do mod 8\n"); // size always 0
|
||||
|
|
@ -89,14 +85,13 @@ int OpBtstImm(int op)
|
|||
if (EaCanWrite(tea)==0) return 1;
|
||||
}
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea,tea);
|
||||
|
||||
ot("\n");
|
||||
EaCalc ( 0,0x0000,sea,0,0,0);
|
||||
EaRead ( 0, 0,sea,0,0,0,0);
|
||||
EaCalcReadNoSE(-1,0,sea,0,0);
|
||||
ot(" mov r10,#1\n");
|
||||
ot(" bic r9,r9,#0x40000000 ;@ Blank Z flag\n");
|
||||
if (tea>=0x10)
|
||||
|
|
@ -112,8 +107,7 @@ int OpBtstImm(int op)
|
|||
if(size>=2) Cycles+=2;
|
||||
}
|
||||
|
||||
EaCalc (11,0x003f,tea,size,0,0);
|
||||
EaRead (11, 0,tea,size,0x003f,0,0);
|
||||
EaCalcReadNoSE((type>0)?11:-1,0,tea,size,0x003f);
|
||||
ot(" tst r0,r10 ;@ Do arithmetic\n");
|
||||
ot(" orreq r9,r9,#0x40000000 ;@ Get Z flag\n");
|
||||
ot("\n");
|
||||
|
|
@ -146,7 +140,7 @@ int OpNeg(int op)
|
|||
if (EaCanRead (ea,size)==0||EaAn(ea)) return 1;
|
||||
if (EaCanWrite(ea )==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=size<2?4:6;
|
||||
|
|
@ -162,7 +156,7 @@ int OpNeg(int op)
|
|||
|
||||
EaCalc (10,0x003f,ea,size,0,0);
|
||||
|
||||
if (type!=1) EaRead (10,0,ea,size,0x003f,0,0); // Don't need to read for 'clr' (or do we, for dummy read?)
|
||||
if (type!=1) EaRead (10,0,ea,size,0x003f,0,0); // Don't need to read for 'clr' (or do we, for a dummy read?)
|
||||
if (type==1) ot("\n");
|
||||
|
||||
if (type==0)
|
||||
|
|
@ -260,7 +254,7 @@ int OpTst(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanWrite(sea)==0||EaAn(sea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea); Cycles=4;
|
||||
|
|
@ -288,7 +282,7 @@ int OpExt(int op)
|
|||
size=(op>>6)&1;
|
||||
shift=32-(8<<size);
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op); Cycles=4;
|
||||
|
|
@ -328,7 +322,7 @@ int OpSet(int op)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanWrite(ea)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=8;
|
||||
|
|
@ -383,7 +377,7 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
|
|||
if (usereg)
|
||||
{
|
||||
ot(";@ Use Dn for count:\n");
|
||||
ot(" and r2,r8,#7<<9\n");
|
||||
ot(" and r2,r8,#0x0e00\n");
|
||||
ot(" ldr r2,[r7,r2,lsr #7]\n");
|
||||
ot(" and r2,r2,#63\n");
|
||||
ot("\n");
|
||||
|
|
@ -426,12 +420,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
|
|||
if (usereg) { // store X only if count is not 0
|
||||
ot(" cmp %s,#0 ;@ shifting by 0?\n",pct);
|
||||
ot(" biceq r9,r9,#0x20000000 ;@ if so, clear carry\n");
|
||||
ot(" movne r1,r9,lsr #28\n");
|
||||
ot(" strneb r1,[r7,#0x45] ;@ else Save X bit\n");
|
||||
ot(" strne r9,[r7,#0x4c] ;@ else Save X bit\n");
|
||||
} else {
|
||||
// count will never be 0 if we use immediate
|
||||
ot(" mov r1,r9,lsr #28\n");
|
||||
ot(" strb r1,[r7,#0x45] ;@ Save X bit\n");
|
||||
ot(" str r9,[r7,#0x4c] ;@ Save X bit\n");
|
||||
}
|
||||
|
||||
if (type==0 && dir) {
|
||||
|
|
@ -462,10 +454,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
|
|||
ot(" movs r0,r0,rrx\n");
|
||||
OpGetFlags(0,1);
|
||||
} else {
|
||||
ot(" ldrb r3,[r7,#0x45]\n");
|
||||
ot(" ldr r3,[r7,#0x4c]\n");
|
||||
ot(" movs r0,r0,lsl #1\n");
|
||||
OpGetFlags(0,1);
|
||||
ot(" tst r3,#2\n");
|
||||
ot(" tst r3,#0x20000000\n");
|
||||
ot(" orrne r0,r0,#0x%x\n", 1<<(32-wide));
|
||||
ot(" bicne r9,r9,#0x40000000 ;@ clear Z in case it got there\n");
|
||||
}
|
||||
|
|
@ -503,10 +495,10 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
|
|||
ot(" orr r0,r3,r0 ;@ r0=Rotated value\n");
|
||||
|
||||
ot(";@ Insert X bit into r2-1:\n");
|
||||
ot(" ldrb r3,[r7,#0x45]\n");
|
||||
ot(" ldr r3,[r7,#0x4c]\n");
|
||||
ot(" sub r2,r2,#1\n");
|
||||
ot(" and r3,r3,#2\n");
|
||||
ot(" mov r3,r3,lsr #1\n");
|
||||
ot(" and r3,r3,#0x20000000\n");
|
||||
ot(" mov r3,r3,lsr #29\n");
|
||||
ot(" orr r0,r0,r3,lsl r2\n");
|
||||
ot("\n");
|
||||
|
||||
|
|
@ -517,15 +509,14 @@ static int EmitAsr(int op,int type,int dir,int count,int size,int usereg)
|
|||
ot(" bicne r9,r9,#0x40000000 ;@ make sure we didn't mess Z\n");
|
||||
}
|
||||
if (usereg) { // store X only if count is not 0
|
||||
ot(" mov r2,r9,lsr #28\n");
|
||||
ot(" strb r2,[r7,#0x45] ;@ if not 0, Save X bit\n");
|
||||
ot(" str r9,[r7,#0x4c] ;@ if not 0, Save X bit\n");
|
||||
ot(" b nozerox%.4x\n",op);
|
||||
ot("norotx%.4x%s\n",op,ms?"":":");
|
||||
ot(" ldrb r2,[r7,#0x45]\n");
|
||||
ot(" ldr r2,[r7,#0x4c]\n");
|
||||
ot(" adds r0,r0,#0 ;@ Defines NZ, clears CV\n");
|
||||
OpGetFlags(0,0);
|
||||
ot(" and r2,r2,#2\n");
|
||||
ot(" orr r9,r9,r2,lsl #28 ;@ C = old_X\n");
|
||||
ot(" and r2,r2,#0x20000000\n");
|
||||
ot(" orr r9,r9,r2 ;@ C = old_X\n");
|
||||
ot("nozerox%.4x%s\n",op,ms?"":":");
|
||||
}
|
||||
|
||||
|
|
@ -642,7 +633,7 @@ int OpAsrEa(int op)
|
|||
if (EaCanRead(ea,0)==0) return 1;
|
||||
if (EaCanWrite(ea)==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=6; // EmitAsr() will add 2
|
||||
|
|
@ -668,7 +659,7 @@ int OpTas(int op, int gen_special)
|
|||
// See if we can do this opcode:
|
||||
if (EaCanWrite(ea)==0 || EaAn(ea)) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,0);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
if (!gen_special) OpStart(op,ea);
|
||||
|
|
|
|||
|
|
@ -6,15 +6,15 @@
|
|||
// trashes r0,r2
|
||||
void OpFlagsToReg(int high)
|
||||
{
|
||||
ot(" ldrb r0,[r7,#0x45] ;@ X bit\n");
|
||||
ot(" ldr r0,[r7,#0x4c] ;@ X bit\n");
|
||||
ot(" mov r1,r9,lsr #28 ;@ ____NZCV\n");
|
||||
ot(" eor r2,r1,r1,ror #1 ;@ Bit 0=C^V\n");
|
||||
ot(" tst r2,#1 ;@ 1 if C!=V\n");
|
||||
ot(" eorne r1,r1,#3 ;@ ____NZVC\n");
|
||||
ot("\n");
|
||||
if (high) ot(" ldrb r2,[r7,#0x44] ;@ Include SR high\n");
|
||||
ot(" and r0,r0,#0x02\n");
|
||||
ot(" orr r1,r1,r0,lsl #3 ;@ ___XNZVC\n");
|
||||
ot(" and r0,r0,#0x20000000\n");
|
||||
ot(" orr r1,r1,r0,lsr #25 ;@ ___XNZVC\n");
|
||||
if (high) ot(" orr r1,r1,r2,lsl #8\n");
|
||||
ot("\n");
|
||||
}
|
||||
|
|
@ -24,10 +24,10 @@ void OpFlagsToReg(int high)
|
|||
void OpRegToFlags(int high)
|
||||
{
|
||||
ot(" eor r1,r0,r0,ror #1 ;@ Bit 0=C^V\n");
|
||||
ot(" mov r2,r0,lsr #3 ;@ r2=___XN\n");
|
||||
ot(" mov r2,r0,lsl #25\n");
|
||||
ot(" tst r1,#1 ;@ 1 if C!=V\n");
|
||||
ot(" eorne r0,r0,#3 ;@ ___XNZCV\n");
|
||||
ot(" strb r2,[r7,#0x45] ;@ Store X bit\n");
|
||||
ot(" str r2,[r7,#0x4c] ;@ Store X bit\n");
|
||||
ot(" mov r9,r0,lsl #28 ;@ r9=NZCV...\n");
|
||||
|
||||
if (high)
|
||||
|
|
@ -45,14 +45,16 @@ void SuperCheck(int op)
|
|||
{
|
||||
ot(" ldr r11,[r7,#0x44] ;@ Get SR high\n");
|
||||
ot(" tst r11,#0x20 ;@ Check we are in supervisor mode\n");
|
||||
ot(" beq WrongMode%.4x ;@ No\n",op);
|
||||
ot(" beq WrongPrivilegeMode ;@ No\n");
|
||||
ot("\n");
|
||||
}
|
||||
|
||||
void SuperEnd(int op)
|
||||
void SuperEnd(void)
|
||||
{
|
||||
ot("WrongMode%.4x%s\n",op,ms?"":":");
|
||||
ot(" sub r4,r4,#2 ;@ this opcode wasn't executed - go back\n");
|
||||
ot(";@ ----------\n");
|
||||
ot(";@ tried execute privileged instruction in user mode\n");
|
||||
ot("WrongPrivilegeMode%s\n",ms?"":":");
|
||||
ot(" sub r4,r4,#2 ;@ last opcode wasn't executed - go back\n");
|
||||
ot(" mov r0,#0x20 ;@ privilege violation\n");
|
||||
ot(" bl Exception\n");
|
||||
Cycles=34;
|
||||
|
|
@ -61,20 +63,20 @@ void SuperEnd(int op)
|
|||
|
||||
// does OSP and A7 swapping if needed
|
||||
// new or old SR (not the one already in [r7,#0x44]) should be passed in r11
|
||||
// trashes r1,r11
|
||||
void SuperChange(int op)
|
||||
// trashes r0,r11
|
||||
void SuperChange(int op,int load_srh)
|
||||
{
|
||||
ot(";@ A7 <-> OSP?\n");
|
||||
ot(" ldr r1,[r7,#0x44] ;@ Get other SR high\n");
|
||||
ot(" and r11,r11,#0x20\n");
|
||||
ot(" and r1,r1,#0x20\n");
|
||||
ot(" teq r11,r1 ;@ r11 xor r1\n");
|
||||
if (load_srh)
|
||||
ot(" ldr r0,[r7,#0x44] ;@ Get other SR high\n");
|
||||
ot(" eor r0,r0,r11\n");
|
||||
ot(" tst r0,#0x20\n");
|
||||
ot(" beq no_sp_swap%.4x\n",op);
|
||||
ot(" ;@ swap OSP and A7:\n");
|
||||
ot(" ldr r11,[r7,#0x3C] ;@ Get A7\n");
|
||||
ot(" ldr r1, [r7,#0x48] ;@ Get OSP\n");
|
||||
ot(" ldr r0, [r7,#0x48] ;@ Get OSP\n");
|
||||
ot(" str r11,[r7,#0x48]\n");
|
||||
ot(" str r1, [r7,#0x3C]\n");
|
||||
ot(" str r0, [r7,#0x3C]\n");
|
||||
ot("no_sp_swap%.4x%s\n", op, ms?"":":");
|
||||
}
|
||||
|
||||
|
|
@ -110,19 +112,19 @@ int OpMove(int op)
|
|||
if (EaCanRead (sea,size)==0) return 1;
|
||||
if (EaCanWrite(tea )==0) return 1;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (tea<0x38) use&=~0x0e00; // Use same handler for register ?0-7
|
||||
|
||||
if (tea>=0x18 && tea<0x28 && (tea&7)==7) use|=0x0e00; // Specific handler for (a7)+ and -(a7)
|
||||
if (tea==0x1f || tea==0x27) use|=0x0e00; // Specific handler for (a7)+ and -(a7)
|
||||
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea,tea); Cycles=4;
|
||||
|
||||
EaCalc(0,0x003f,sea,size);
|
||||
EaRead(0, 1,sea,size,0x003f);
|
||||
EaCalcRead(-1,1,sea,size,0x003f);
|
||||
|
||||
if (movea==0) {
|
||||
if (movea==0)
|
||||
{
|
||||
ot(" adds r1,r1,#0 ;@ Defines NZ, clears CV\n");
|
||||
ot(" mrs r9,cpsr ;@ r9=NZCV flags\n");
|
||||
ot("\n");
|
||||
|
|
@ -130,19 +132,19 @@ int OpMove(int op)
|
|||
|
||||
if (movea) size=2; // movea always expands to 32-bits
|
||||
|
||||
EaCalc (0,0x0e00,tea,size,0,0);
|
||||
#if SPLIT_MOVEL_PD
|
||||
EaCalc (10,0x1e00,tea,size,0,0);
|
||||
if ((tea&0x38)==0x20 && size==2) { // -(An)
|
||||
ot(" mov r10,r0\n");
|
||||
ot(" mov r11,r1\n");
|
||||
ot(" add r0,r0,#2\n");
|
||||
EaWrite(0, 1,tea,1,0x0e00,0,0);
|
||||
EaWrite(10, 11,tea,1,0x0e00,1);
|
||||
ot(" add r0,r10,#2\n");
|
||||
EaWrite(0, 1,tea,1,0x1e00,0,0);
|
||||
EaWrite(10, 11,tea,1,0x1e00,1);
|
||||
} else {
|
||||
EaWrite(0, 1,tea,size,0x0e00,0,0);
|
||||
EaWrite(0, 1,tea,size,0x1e00,0,0);
|
||||
}
|
||||
#else
|
||||
EaWrite(0, 1,tea,size,0x0e00,0,0);
|
||||
EaCalc (0,0x1e00,tea,size,0,0);
|
||||
EaWrite(0, 1,tea,size,0x1e00,0,0);
|
||||
#endif
|
||||
|
||||
#if CYCLONE_FOR_GENESIS && !MEMHANDLERS_CHANGE_CYCLES
|
||||
|
|
@ -169,15 +171,15 @@ int OpLea(int op)
|
|||
|
||||
if (EaCanRead(sea,-1)==0) return 1; // See if we can do this opcode
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,0);
|
||||
use&=~0x0e00; // Also use 1 handler for target ?0-7
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,sea,tea);
|
||||
|
||||
EaCalc (1,0x003f,sea,0); // Lea
|
||||
EaCalc (0,0x0e00,tea,2,1);
|
||||
EaWrite(0, 1,tea,2,0x0e00,1);
|
||||
EaCalc (0,0x1e00,tea,2);
|
||||
EaWrite(0, 1,tea,2,0x1e00);
|
||||
|
||||
Cycles=Ea_add_ns(g_lea_cycle_table,sea);
|
||||
|
||||
|
|
@ -212,7 +214,7 @@ int OpMoveSr(int op)
|
|||
break;
|
||||
}
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea);
|
||||
|
|
@ -230,19 +232,16 @@ int OpMoveSr(int op)
|
|||
|
||||
if (type==2 || type==3)
|
||||
{
|
||||
EaCalc(0,0x003f,ea,size,0,0);
|
||||
EaRead(0, 0,ea,size,0x003f,0,0);
|
||||
EaCalcReadNoSE(-1,0,ea,size,0x003f);
|
||||
OpRegToFlags(type==3);
|
||||
if (type==3) {
|
||||
SuperChange(op);
|
||||
SuperChange(op,0);
|
||||
CheckInterrupt(op);
|
||||
}
|
||||
}
|
||||
|
||||
OpEnd(ea);
|
||||
|
||||
if (type==3) SuperEnd(op);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -257,7 +256,7 @@ int OpArithSr(int op)
|
|||
size=(op>>6)&1; // ccr or sr?
|
||||
ea=0x3c;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea); Cycles=16;
|
||||
|
|
@ -273,12 +272,11 @@ int OpArithSr(int op)
|
|||
if (type==5) ot(" eor r0,r1,r10\n");
|
||||
OpRegToFlags(size);
|
||||
if (size) {
|
||||
SuperChange(op);
|
||||
SuperChange(op,0);
|
||||
CheckInterrupt(op);
|
||||
}
|
||||
|
||||
OpEnd(ea);
|
||||
if (size) SuperEnd(op);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -293,7 +291,7 @@ int OpPea(int op)
|
|||
ea=op&0x003f; if (ea<0x10) return 1; // Swap opcode
|
||||
if (EaCanRead(ea,-1)==0) return 1; // See if we can do this opcode:
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,0);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea);
|
||||
|
|
@ -336,7 +334,7 @@ int OpMovem(int op)
|
|||
|
||||
cea=ea; if (change) cea=0x10;
|
||||
|
||||
use=OpBase(op);
|
||||
use=OpBase(op,size);
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler
|
||||
|
||||
OpStart(op,ea);
|
||||
|
|
@ -430,20 +428,18 @@ int OpMoveUsp(int op)
|
|||
if (dir)
|
||||
{
|
||||
ot(" ldr r1,[r7,#0x48] ;@ Get from USP\n\n");
|
||||
EaCalc (0,0x0007,8,2,1);
|
||||
EaWrite(0, 1,8,2,0x0007,1);
|
||||
EaCalc (0,0x000f,8,2,1);
|
||||
EaWrite(0, 1,8,2,0x000f,1);
|
||||
}
|
||||
else
|
||||
{
|
||||
EaCalc (0,0x0007,8,2,1);
|
||||
EaRead (0, 0,8,2,0x0007,1);
|
||||
EaCalc (0,0x000f,8,2,1);
|
||||
EaRead (0, 0,8,2,0x000f,1);
|
||||
ot(" str r0,[r7,#0x48] ;@ Put in USP\n\n");
|
||||
}
|
||||
|
||||
OpEnd();
|
||||
|
||||
SuperEnd(op);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -509,14 +505,15 @@ int OpExg(int op)
|
|||
// 0000sss1 1z001ddd (to mem)
|
||||
int OpMovep(int op)
|
||||
{
|
||||
int ea=0;
|
||||
int size=1,use=0,dir;
|
||||
int ea=0,rea=0;
|
||||
int size=1,use=0,dir,aadd=0;
|
||||
|
||||
use=op&0xf1f8;
|
||||
if (op!=use) { OpUse(op,use); return 0; } // Use existing handler (for all dests, srcs)
|
||||
|
||||
// Get EA
|
||||
ea = (op&0x0007)|0x28;
|
||||
rea= op&0x0e00;
|
||||
dir = (op>>7)&1;
|
||||
|
||||
// Find size extension
|
||||
|
|
@ -525,41 +522,43 @@ int OpMovep(int op)
|
|||
OpStart(op,ea);
|
||||
|
||||
if(dir) { // reg to mem
|
||||
EaCalc(11,0x0e00,0,size); // reg number -> r11
|
||||
EaRead(11,11,0,size,0x0e00); // regval -> r11
|
||||
EaCalc(10,0x0007,ea,size);
|
||||
EaCalcReadNoSE(-1,11,rea,size,0x1e00);
|
||||
|
||||
EaCalc(10,0x000f,ea,size);
|
||||
if(size==2) { // if operand is long
|
||||
ot(" mov r1,r11,lsr #24 ;@ first byte\n");
|
||||
EaWrite(10,1,ea,0,0x0007); // store first byte
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaWrite(10,1,ea,0,0x000f); // store first byte
|
||||
ot(" add r0,r10,#%i\n",(aadd+=2));
|
||||
ot(" mov r1,r11,lsr #16 ;@ second byte\n");
|
||||
EaWrite(10,1,ea,0,0x0007); // store second byte
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaWrite(0,1,ea,0,0x000f); // store second byte
|
||||
ot(" add r0,r10,#%i\n",(aadd+=2));
|
||||
} else {
|
||||
ot(" mov r0,r10\n");
|
||||
}
|
||||
ot(" mov r1,r11,lsr #8 ;@ first or third byte\n");
|
||||
EaWrite(10,1,ea,0,0x0007);
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaWrite(0,1,ea,0,0x000f);
|
||||
ot(" add r0,r10,#%i\n",(aadd+=2));
|
||||
ot(" and r1,r11,#0xff\n");
|
||||
EaWrite(10,1,ea,0,0x0007);
|
||||
EaWrite(0,1,ea,0,0x000f);
|
||||
} else { // mem to reg
|
||||
EaCalc(10,0x0007,ea,size,1);
|
||||
EaRead(10,11,ea,0,0x0007,1); // read first byte
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaRead(10,1,ea,0,0x0007,1); // read second byte
|
||||
EaCalc(10,0x000f,ea,size,1);
|
||||
EaRead(10,11,ea,0,0x000f,1); // read first byte
|
||||
ot(" add r0,r10,#2\n");
|
||||
EaRead(0,1,ea,0,0x000f,1); // read second byte
|
||||
if(size==2) { // if operand is long
|
||||
ot(" orr r11,r11,r1,lsr #8 ;@ second byte\n");
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaRead(10,1,ea,0,0x0007,1);
|
||||
ot(" add r0,r10,#4\n");
|
||||
EaRead(0,1,ea,0,0x000f,1);
|
||||
ot(" orr r11,r11,r1,lsr #16 ;@ third byte\n");
|
||||
ot(" add r10,r10,#2\n");
|
||||
EaRead(10,1,ea,0,0x0007,1);
|
||||
ot(" orr r0,r11,r1,lsr #24 ;@ fourth byte\n");
|
||||
ot(" add r0,r10,#6\n");
|
||||
EaRead(0,1,ea,0,0x000f,1);
|
||||
ot(" orr r1,r11,r1,lsr #24 ;@ fourth byte\n");
|
||||
} else {
|
||||
ot(" orr r0,r11,r1,lsr #8 ;@ second byte\n");
|
||||
ot(" orr r1,r11,r1,lsr #8 ;@ second byte\n");
|
||||
}
|
||||
// store the result
|
||||
EaCalc(11,0x0e00,0,size,1); // reg number -> r11
|
||||
EaWrite(11,0,0,size,0x0e00,1);
|
||||
EaCalc(11,0x0e00,rea,size,1); // reg number -> r11
|
||||
EaWrite(11,1,rea,size,0x0e00,1);
|
||||
}
|
||||
|
||||
Cycles=(size==2)?24:16;
|
||||
|
|
@ -571,7 +570,7 @@ int OpMovep(int op)
|
|||
// Emit a Stop/Reset opcodes, 01001110 011100t0 imm
|
||||
int OpStopReset(int op)
|
||||
{
|
||||
int type=(op>>1)&1; // reset/stop
|
||||
int type=(op>>1)&1; // stop/reset
|
||||
|
||||
OpStart(op);
|
||||
|
||||
|
|
@ -580,8 +579,8 @@ int OpStopReset(int op)
|
|||
if(type) {
|
||||
// copy immediate to SR, stop the CPU and eat all remaining cycles.
|
||||
ot(" ldrh r0,[r4],#2 ;@ Fetch the immediate\n");
|
||||
SuperChange(op);
|
||||
OpRegToFlags(1);
|
||||
SuperChange(op,0);
|
||||
|
||||
ot("\n");
|
||||
|
||||
|
|
@ -604,16 +603,16 @@ int OpStopReset(int op)
|
|||
ot(" ldr r11,[r7,#0x90] ;@ ResetCallback\n");
|
||||
ot(" tst r11,r11\n");
|
||||
ot(" movne lr,pc\n");
|
||||
ot(" movne pc,r11 ;@ call ResetCallback if it is defined\n");
|
||||
ot(" bxne r11 ;@ call ResetCallback if it is defined\n");
|
||||
ot(" ldrb r9,[r7,#0x46] ;@ r9 = Load Flags (NZCV)\n");
|
||||
ot(" ldr r5,[r7,#0x5c] ;@ Load Cycles\n");
|
||||
ot(" ldr r4,[r7,#0x40] ;@ Load PC\n");
|
||||
ot(" mov r9,r9,lsl #28\n");
|
||||
ot("\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
OpEnd();
|
||||
SuperEnd(op);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -18,6 +18,8 @@ extern int g_movem_cycle_table[];
|
|||
int Ea_add_ns(int *tab, int ea); // add nonstandard EA cycles
|
||||
int EaCalc(int a,int mask,int ea,int size,int top=0,int sign_extend=1); // 6
|
||||
int EaRead(int a,int v,int ea,int size,int mask,int top=0,int sign_extend=1); // 7
|
||||
int EaCalcRead(int r_ea,int r,int ea,int size,int mask,int sign_extend=1); // 6
|
||||
int EaCalcReadNoSE(int r_ea,int r,int ea,int size,int mask);
|
||||
int EaCanRead(int ea,int size);
|
||||
int EaWrite(int a,int v,int ea,int size,int mask,int top=0,int sign_extend_ea=1);
|
||||
int EaCanWrite(int ea);
|
||||
|
|
@ -37,11 +39,12 @@ int MemHandler(int type,int size,int addrreg=0);
|
|||
void FlushPC(void);
|
||||
|
||||
// OpAny.cpp
|
||||
extern int g_op;
|
||||
int OpGetFlags(int subtract,int xbit,int sprecialz=0);
|
||||
void OpUse(int op,int use);
|
||||
void OpStart(int op,int sea=0,int tea=0);
|
||||
void OpEnd(int sea=0,int tea=0);
|
||||
int OpBase(int op,int sepa=0);
|
||||
int OpBase(int op,int size,int sepa=0);
|
||||
void OpAny(int op);
|
||||
|
||||
//----------------------
|
||||
|
|
@ -95,8 +98,9 @@ int OpMovem(int op);
|
|||
int OpMoveq(int op);
|
||||
int OpMoveUsp(int op);
|
||||
int OpExg(int op);
|
||||
int OpMovep(int op); // notaz
|
||||
int OpMovep(int op);
|
||||
int OpStopReset(int op);
|
||||
void SuperCheck(int op);
|
||||
void SuperEnd(int op);
|
||||
void SuperChange(int op);
|
||||
void SuperEnd(void);
|
||||
void SuperChange(int op,int load_srh=1);
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue