4 // some ops use non-standard cycle counts for EAs, so are listed here.
\r
5 // all constants borrowed from the MUSASHI core by Karl Stenerud.
\r
7 /* Extra cycles for JMP instruction (000, 010) */
\r
8 int g_jmp_cycle_table[8] =
\r
12 10, /* EA_MODE_IX */
\r
15 6, /* EA_MODE_PCDI */
\r
16 10, /* EA_MODE_PCIX */
\r
20 /* Extra cycles for JSR instruction (000, 010) */
\r
21 int g_jsr_cycle_table[8] =
\r
25 10, /* EA_MODE_IX */
\r
28 6, /* EA_MODE_PCDI */
\r
29 10, /* EA_MODE_PCIX */
\r
33 /* Extra cycles for LEA instruction (000, 010) */
\r
34 int g_lea_cycle_table[8] =
\r
38 12, /* EA_MODE_IX */
\r
40 12, /* EA_MODE_AL */
\r
41 8, /* EA_MODE_PCDI */
\r
42 12, /* EA_MODE_PCIX */
\r
46 /* Extra cycles for PEA instruction (000, 010) */
\r
47 int g_pea_cycle_table[8] =
\r
50 10, /* EA_MODE_DI */
\r
51 14, /* EA_MODE_IX */
\r
52 10, /* EA_MODE_AW */
\r
53 14, /* EA_MODE_AL */
\r
54 10, /* EA_MODE_PCDI */
\r
55 14, /* EA_MODE_PCIX */
\r
59 /* Extra cycles for MOVEM instruction (000, 010) */
\r
60 int g_movem_cycle_table[8] =
\r
67 0, /* EA_MODE_PCDI */
\r
68 0, /* EA_MODE_PCIX */
\r
72 // add nonstandard EA
\r
73 int Ea_add_ns(int *tab, int ea)
\r
75 if(ea<0x10) return 0;
\r
76 if((ea&0x38)==0x10) return tab[0]; // (An) (ai)
\r
77 if(ea<0x28) return 0;
\r
78 if(ea<0x30) return tab[1]; // ($nn,An) (di)
\r
79 if(ea<0x38) return tab[2]; // ($nn,An,Rn) (ix)
\r
80 if(ea==0x38) return tab[3]; // (aw)
\r
81 if(ea==0x39) return tab[4]; // (al)
\r
82 if(ea==0x3a) return tab[5]; // ($nn,PC) (pcdi)
\r
83 if(ea==0x3b) return tab[6]; // ($nn,pc,Rn) (pcix)
\r
84 if(ea==0x3c) return tab[7]; // #$nnnn (i)
\r
89 // ---------------------------------------------------------------------------
\r
90 // Gets the offset of a register for an ea, and puts it in 'r'
\r
91 // Shifted left by 'shift'
\r
92 // Doesn't trash anything
\r
93 static int EaCalcReg(int r,int ea,int mask,int forceor,int shift,int noshift=0)
\r
95 int i=0,low=0,needor=0;
\r
98 for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is
\r
99 mask&=0xf<<low; // This is the max we can do
\r
101 if (ea>=8) needor=1; // Need to OR to access A0-7
\r
103 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
\r
105 if (forceor) needor=1; // Special case for 0x30-0x38 EAs ;)
\r
107 ot(" and r%d,r8,#0x%.4x\n",r,mask);
\r
108 if (needor) ot(" orr r%d,r%d,#0x%x ;@ A0-7\n",r,r,8<<low);
\r
110 // Find out amount to shift left:
\r
115 ot(" mov r%d,r%d,",r,r);
\r
116 if (lsl>0) ot("lsl #%d\n", lsl);
\r
117 else ot("lsr #%d\n",-lsl);
\r
123 // EaCalc - ARM Register 'a' = Effective Address
\r
124 // Trashes r0,r2 and r3
\r
125 // size values 0, 1, 2 ~ byte, word, long
\r
126 int EaCalc(int a,int mask,int ea,int size,int top)
\r
131 DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address
\r
132 func=0x68+(size<<2); // Get correct read handler
\r
137 if (size>=2||(size==0&&top)) noshift=1; // Saves one opcode
\r
139 ot(";@ EaCalc : Get register index into r%d:\n",a);
\r
141 EaCalcReg(a,ea,mask,0,2,noshift);
\r
145 ot(";@ EaCalc : Get '%s' into r%d:\n",text,a);
\r
146 // (An), (An)+, -(An)
\r
149 int step=1<<size, strr=a;
\r
152 if ((ea&7)==7 && step<2) step=2; // move.b (a7)+ or -(a7) steps by 2 not 1
\r
154 EaCalcReg(2,ea,mask,0,0,1);
\r
156 for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is
\r
157 lsl=2-low; // Having a lsl #x here saves one opcode
\r
158 if (lsl>=0) ot(" ldr r%d,[r7,r2,lsl #%i]\n",a,lsl);
\r
159 else if (lsl<0) ot(" ldr r%d,[r7,r2,lsr #%i]\n",a,-lsl);
\r
161 if ((ea&0x38)==0x18) // (An)+
\r
163 ot(" add r3,r%d,#%d ;@ Post-increment An\n",a,step);
\r
167 if ((ea&0x38)==0x20) // -(An)
\r
168 ot(" sub r%d,r%d,#%d ;@ Pre-decrement An\n",a,a,step);
\r
170 if ((ea&0x38)==0x18||(ea&0x38)==0x20)
\r
172 if (lsl>=0) ot(" str r%d,[r7,r2,lsl #%i]\n",strr,lsl);
\r
173 else if (lsl<0) ot(" str r%d,[r7,r2,lsr #%i]\n",strr,-lsl);
\r
176 if ((ea&0x38)==0x20) Cycles+=size<2 ? 6:10; // -(An) Extra cycles
\r
177 else Cycles+=size<2 ? 4:8; // (An),(An)+ Extra cycles
\r
181 if (ea<0x30) // ($nn,An) (di)
\r
183 EaCalcReg(2,8,mask,0,0);
\r
184 ot(" ldrsh r0,[r4],#2 ;@ Fetch offset\n");
\r
185 ot(" ldr r2,[r7,r2,lsl #2]\n");
\r
186 ot(" add r%d,r0,r2 ;@ Add on offset\n",a);
\r
187 Cycles+=size<2 ? 8:12; // Extra cycles
\r
191 if (ea<0x38) // ($nn,An,Rn) (ix)
\r
193 ot(";@ Get extension word into r3:\n");
\r
194 ot(" ldrh r3,[r4],#2 ;@ ($Disp,PC,Rn)\n");
\r
195 ot(" mov r2,r3,lsr #10\n");
\r
196 ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");
\r
197 ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");
\r
198 ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");
\r
199 ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");
\r
200 ot(" mov r0,r3,asl #24 ;@ r0=Get 8-bit signed Disp\n");
\r
201 ot(" add r3,r2,r0,asr #24 ;@ r3=Disp+Rn\n");
\r
203 EaCalcReg(2,8,mask,1,0);
\r
204 ot(" ldr r2,[r7,r2,lsl #2]\n");
\r
205 ot(" add r%d,r2,r3 ;@ r%d=Disp+An+Rn\n",a,a);
\r
206 Cycles+=size<2 ? 10:14; // Extra cycles
\r
210 if (ea==0x38) // (aw)
\r
212 ot(" ldrsh r%d,[r4],#2 ;@ Fetch Absolute Short address\n",a);
\r
213 Cycles+=size<2 ? 8:12; // Extra cycles
\r
217 if (ea==0x39) // (al)
\r
219 ot(" ldrh r2,[r4],#2 ;@ Fetch Absolute Long address\n");
\r
220 ot(" ldrh r0,[r4],#2\n");
\r
221 ot(" orr r%d,r0,r2,lsl #16\n",a);
\r
222 Cycles+=size<2 ? 12:16; // Extra cycles
\r
226 if (ea==0x3a) // ($nn,PC) (pcdi)
\r
228 ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");
\r
229 ot(" sub r0,r4,r0 ;@ Real PC\n");
\r
230 ot(" ldrsh r2,[r4],#2 ;@ Fetch extension\n");
\r
231 ot(" mov r0,r0,lsl #8\n");
\r
232 ot(" add r%d,r2,r0,asr #8 ;@ ($nn,PC)\n",a);
\r
233 Cycles+=size<2 ? 8:12; // Extra cycles
\r
237 if (ea==0x3b) // ($nn,pc,Rn) (pcix)
\r
239 ot(" ldr r0,[r7,#0x60] ;@ Get Memory base\n");
\r
240 ot(" ldrh r3,[r4] ;@ Get extension word\n");
\r
241 ot(" sub r0,r4,r0 ;@ r0=PC\n");
\r
242 ot(" add r4,r4,#2\n");
\r
243 ot(" mov r0,r0,asl #8 ;@ use only 24bits of PC\n");
\r
244 ot(" mov r2,r3,lsr #10\n");
\r
245 ot(" tst r3,#0x0800 ;@ Is Rn Word or Long\n");
\r
246 ot(" and r2,r2,#0x3c ;@ r2=Index of Rn\n");
\r
247 ot(" ldreqsh r2,[r7,r2] ;@ r2=Rn.w\n");
\r
248 ot(" ldrne r2,[r7,r2] ;@ r2=Rn.l\n");
\r
249 ot(" mov r3,r3,asl #24 ;@ r3=Get 8-bit signed Disp\n");
\r
250 ot(" add r2,r2,r3,asr #24 ;@ r2=Disp+Rn\n");
\r
251 ot(" add r%d,r2,r0,asr #8 ;@ r%d=Disp+PC+Rn\n",a,a);
\r
252 Cycles+=size<2 ? 10:14; // Extra cycles
\r
256 if (ea==0x3c) // #$nnnn (i)
\r
260 ot(" ldr%s r%d,[r4],#2 ;@ Fetch immediate value\n",Sarm[size&3],a);
\r
261 Cycles+=4; // Extra cycles
\r
265 ot(" ldrh r2,[r4],#2 ;@ Fetch immediate value\n");
\r
266 ot(" ldrh r0,[r4],#2\n");
\r
267 ot(" orr r%d,r0,r2,lsl #16\n",a);
\r
268 Cycles+=8; // Extra cycles
\r
275 // ---------------------------------------------------------------------------
\r
276 // Read effective address in (ARM Register 'a') to ARM register 'v'
\r
277 // 'a' and 'v' can be anything but 0 is generally best (for both)
\r
278 // If (ea<0x10) nothing is trashed, else r0-r3 is trashed
\r
279 // If 'top' is given, the ARM register v shifted to the top, e.g. 0xc000 -> 0xc0000000
\r
280 // Otherwise the ARM register v is sign extended, e.g. 0xc000 -> 0xffffc000
\r
282 int EaRead(int a,int v,int ea,int size,int mask,int top)
\r
287 shift=32-(8<<size);
\r
289 DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address
\r
294 if (size>=2||(size==0&&top)) {
\r
296 for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is
\r
297 lsl=2-low; // Having a lsl #2 here saves one opcode
\r
300 ot(";@ EaRead : Read register[r%d] into r%d:\n",a,v);
\r
302 if (lsl>0) ot(" ldr%s r%d,[r7,r%d,lsl #%i]\n",Narm[size&3],v,a,lsl);
\r
303 else if (lsl<0) ot(" ldr%s r%d,[r7,r%d,lsr #%i]\n",Narm[size&3],v,a,-lsl);
\r
304 else ot(" ldr%s r%d,[r7,r%d]\n",Sarm[size&3],v,a);
\r
306 if (top && shift) ot(" mov r%d,r%d,asl #%d\n",v,v,shift);
\r
308 ot("\n"); return 0;
\r
311 ot(";@ EaRead : Read '%s' (address in r%d) into r%d:\n",text,a,v);
\r
317 if (top) asl=shift;
\r
319 if (v!=a || asl) ot(" mov r%d,r%d,asl #%d\n",v,a,asl);
\r
320 ot("\n"); return 0;
\r
323 if (a!=0) ot(" mov r0,r%d\n",a);
\r
325 if (ea>=0x3a && ea<=0x3b) MemHandler(2,size); // Fetch
\r
326 else MemHandler(0,size); // Read
\r
328 if (v!=0 || shift) {
\r
329 if (shift) ot(" mov r%d,r0,asl #%d\n",v,shift);
\r
330 else ot(" mov r%d,r0\n",v);
\r
332 if (top==0 && shift) ot(" mov r%d,r%d,asr #%d\n",v,v,shift);
\r
334 ot("\n"); return 0;
\r
337 // Return 1 if we can read this ea
\r
338 int EaCanRead(int ea,int size)
\r
343 // These don't make sense?:
\r
344 if (ea< 0x10) return 0; // Register
\r
345 if (ea==0x3c) return 0; // Immediate
\r
346 if (ea>=0x18 && ea<0x28) return 0; // Pre/Post inc/dec An
\r
349 if (ea<=0x3c) return 1;
\r
353 // ---------------------------------------------------------------------------
\r
354 // Write effective address (ARM Register 'a') with ARM register 'v'
\r
355 // Trashes r0-r3,r12,lr; 'a' can be 0 or 2+, 'v' can be 1 or higher
\r
356 // If a==0 and v==1 it's faster though.
\r
357 int EaWrite(int a,int v,int ea,int size,int mask,int top)
\r
362 if(a == 1) { printf("Error! EaWrite a==1 !\n"); return 1; }
\r
364 if (top) shift=32-(8<<size);
\r
366 DisaPc=2; DisaGetEa(text,ea,size); // Get text version of the effective address
\r
371 if (size>=2||(size==0&&top)) {
\r
373 for (i=mask|0x8000; (i&1)==0; i>>=1) low++; // Find out how high up the EA mask is
\r
374 lsl=2-low; // Having a lsl #x here saves one opcode
\r
377 ot(";@ EaWrite: r%d into register[r%d]:\n",v,a);
\r
378 if (shift) ot(" mov r%d,r%d,asr #%d\n",v,v,shift);
\r
380 if (lsl>0) ot(" str%s r%d,[r7,r%d,lsl #%i]\n",Narm[size&3],v,a,lsl);
\r
381 else if (lsl<0) ot(" str%s r%d,[r7,r%d,lsr #%i]\n",Narm[size&3],v,a,-lsl);
\r
382 else ot(" str%s r%d,[r7,r%d]\n",Narm[size&3],v,a);
\r
384 ot("\n"); return 0;
\r
387 ot(";@ EaWrite: Write r%d into '%s' (address in r%d):\n",v,text,a);
\r
389 if (ea==0x3c) { ot("Error! Write EA=0x%x\n\n",ea); return 1; }
\r
391 if (a!=0 && v!=0) ot(" mov r0,r%d\n",a);
\r
392 if (v!=1 || shift) ot(" mov r1,r%d,asr #%d\n",v,shift);
\r
393 if (a!=0 && v==0) ot(" mov r0,r%d\n",a);
\r
395 MemHandler(1,size); // Call write handler
\r
397 ot("\n"); return 0;
\r
400 // Return 1 if we can write this ea
\r
401 int EaCanWrite(int ea)
\r
403 if (ea<=0x39) return 1; // 3b?
\r
406 // ---------------------------------------------------------------------------
\r
408 // Return 1 if EA is An reg
\r
411 if((ea&0x38)==8) return 1;
\r