diff options
Diffstat (limited to 'apps/codecs/spc/spc_cpu.c')
-rw-r--r-- | apps/codecs/spc/spc_cpu.c | 1050 |
1 files changed, 0 insertions, 1050 deletions
diff --git a/apps/codecs/spc/spc_cpu.c b/apps/codecs/spc/spc_cpu.c deleted file mode 100644 index 6aa9499d1e..0000000000 --- a/apps/codecs/spc/spc_cpu.c +++ /dev/null | |||
@@ -1,1050 +0,0 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2006-2007 Adam Gashlin (hcs) | ||
11 | * Copyright (C) 2004-2007 Shay Green (blargg) | ||
12 | * Copyright (C) 2002 Brad Martin | ||
13 | * | ||
14 | * This program is free software; you can redistribute it and/or | ||
15 | * modify it under the terms of the GNU General Public License | ||
16 | * as published by the Free Software Foundation; either version 2 | ||
17 | * of the License, or (at your option) any later version. | ||
18 | * | ||
19 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
20 | * KIND, either express or implied. | ||
21 | * | ||
22 | ****************************************************************************/ | ||
23 | |||
24 | /* The CPU portion (shock!) */ | ||
25 | #include "codec.h" | ||
26 | #include "codecs.h" | ||
27 | #include "spc_codec.h" | ||
28 | #include "spc_profiler.h" | ||
29 | |||
30 | #undef check | ||
31 | #define check assert | ||
32 | |||
33 | #define READ( addr ) (SPC_read( this, addr, spc_time_ )) | ||
34 | #define WRITE( addr, value ) (SPC_write( this, addr, value, spc_time_ )) | ||
35 | |||
36 | #define READ_DP( addr ) READ( (addr) + dp ) | ||
37 | #define WRITE_DP( addr, value ) WRITE( (addr) + dp, value ) | ||
38 | |||
39 | #define READ_PROG16( addr ) GET_LE16( RAM + (addr) ) | ||
40 | |||
41 | #define READ_PC( pc ) (*(pc)) | ||
42 | #define READ_PC16( pc ) GET_LE16( pc ) | ||
43 | |||
44 | #define SET_PC( n ) (pc = RAM + (n)) | ||
45 | #define GET_PC() (pc - RAM) | ||
46 | |||
47 | static unsigned char const cycle_table [0x100] = { | ||
48 | 2,8,4,5,3,4,3,6,2,6,5,4,5,4,6,8, /* 0 */ | ||
49 | 2,8,4,5,4,5,5,6,5,5,6,5,2,2,4,6, /* 1 */ | ||
50 | 2,8,4,5,3,4,3,6,2,6,5,4,5,4,5,4, /* 2 */ | ||
51 | 2,8,4,5,4,5,5,6,5,5,6,5,2,2,3,8, /* 3 */ | ||
52 | 2,8,4,5,3,4,3,6,2,6,4,4,5,4,6,6, /* 4 */ | ||
53 | 2,8,4,5,4,5,5,6,5,5,4,5,2,2,4,3, /* 5 */ | ||
54 | 2,8,4,5,3,4,3,6,2,6,4,4,5,4,5,5, /* 6 */ | ||
55 | 2,8,4,5,4,5,5,6,5,5,5,5,2,2,3,6, /* 7 */ | ||
56 | 2,8,4,5,3,4,3,6,2,6,5,4,5,2,4,5, /* 8 */ | ||
57 | 2,8,4,5,4,5,5,6,5,5,5,5,2,2,12,5,/* 9 */ | ||
58 | 3,8,4,5,3,4,3,6,2,6,4,4,5,2,4,4, /* A */ | ||
59 | 2,8,4,5,4,5,5,6,5,5,5,5,2,2,3,4, /* B */ | ||
60 | 3,8,4,5,4,5,4,7,2,5,6,4,5,2,4,9, /* C */ | ||
61 | 2,8,4,5,5,6,6,7,4,5,4,5,2,2,6,3, /* D */ | ||
62 | 2,8,4,5,3,4,3,6,2,4,5,3,4,3,4,3, /* E */ | ||
63 | 2,8,4,5,4,5,5,6,3,4,5,4,2,2,4,3 /* F */ | ||
64 | }; | ||
65 | |||
66 | #define MEM_BIT() CPU_mem_bit( this, pc, spc_time_ ) | ||
67 | |||
68 | static unsigned CPU_mem_bit( THIS, uint8_t const* pc, long const spc_time_ ) | ||
69 | ICODE_ATTR; | ||
70 | |||
71 | static unsigned CPU_mem_bit( THIS, uint8_t const* pc, long const spc_time_ ) | ||
72 | { | ||
73 | unsigned addr = READ_PC16( pc ); | ||
74 | unsigned t = READ( addr & 0x1FFF ) >> (addr >> 13); | ||
75 | return (t << 8) & 0x100; | ||
76 | } | ||
77 | |||
78 | /* status flags */ | ||
79 | enum { st_n = 0x80 }; | ||
80 | enum { st_v = 0x40 }; | ||
81 | enum { st_p = 0x20 }; | ||
82 | enum { st_b = 0x10 }; | ||
83 | enum { st_h = 0x08 }; | ||
84 | enum { st_i = 0x04 }; | ||
85 | enum { st_z = 0x02 }; | ||
86 | enum { st_c = 0x01 }; | ||
87 | |||
88 | #define IS_NEG (nz & 0x880) | ||
89 | |||
90 | #define CALC_STATUS( out )\ | ||
91 | {\ | ||
92 | out = status & ~(st_n | st_z | st_c);\ | ||
93 | out |= (c >> 8) & st_c;\ | ||
94 | out |= (dp >> 3) & st_p;\ | ||
95 | if ( IS_NEG ) out |= st_n;\ | ||
96 | if ( !(nz & 0xFF) ) out |= st_z;\ | ||
97 | } | ||
98 | |||
99 | #define SET_STATUS( in )\ | ||
100 | {\ | ||
101 | status = in & ~(st_n | st_z | st_c | st_p);\ | ||
102 | c = in << 8;\ | ||
103 | nz = ((in << 4) & 0x800) | (~in & st_z);\ | ||
104 | dp = (in << 3) & 0x100;\ | ||
105 | } | ||
106 | |||
107 | |||
108 | /* stack */ | ||
109 | #define PUSH( v ) (*--sp = (uint8_t) (v)) | ||
110 | #define PUSH16( v ) (sp -= 2, SET_LE16( sp, v )) | ||
111 | #define POP() (*sp++) | ||
112 | #define SET_SP( v ) (sp = RAM + 0x101 + (v)) | ||
113 | #define GET_SP() (sp - 0x101 - RAM) | ||
114 | |||
115 | long CPU_run( THIS, long start_time ) | ||
116 | { | ||
117 | #if 0 | ||
118 | ENTER_TIMER(cpu); | ||
119 | #endif | ||
120 | |||
121 | register long spc_time_ = start_time; | ||
122 | |||
123 | #ifdef CPU_ARM | ||
124 | uint8_t* const ram_ = ram.ram; | ||
125 | #undef RAM | ||
126 | #define RAM ram_ | ||
127 | #endif | ||
128 | |||
129 | int a = this->r.a; | ||
130 | int x = this->r.x; | ||
131 | int y = this->r.y; | ||
132 | |||
133 | uint8_t const* pc; | ||
134 | SET_PC( this->r.pc ); | ||
135 | |||
136 | uint8_t* sp; | ||
137 | SET_SP( this->r.sp ); | ||
138 | |||
139 | int status; | ||
140 | int c; | ||
141 | int nz; | ||
142 | unsigned dp; | ||
143 | { | ||
144 | int temp = this->r.status; | ||
145 | SET_STATUS( temp ); | ||
146 | } | ||
147 | |||
148 | goto loop; | ||
149 | |||
150 | /* main loop */ | ||
151 | cbranch_taken_loop: | ||
152 | pc += *(int8_t const*) pc; | ||
153 | spc_time_ += 2; | ||
154 | inc_pc_loop: | ||
155 | pc++; | ||
156 | loop: | ||
157 | check( (unsigned) GET_PC() < 0x10000 ); | ||
158 | check( (unsigned) GET_SP() < 0x100 ); | ||
159 | check( (unsigned) a < 0x100 ); | ||
160 | check( (unsigned) x < 0x100 ); | ||
161 | check( (unsigned) y < 0x100 ); | ||
162 | |||
163 | unsigned opcode = *pc; | ||
164 | int cycles = this->cycle_table [opcode]; | ||
165 | unsigned data = *++pc; | ||
166 | if ( (spc_time_ += cycles) > 0 ) | ||
167 | goto out_of_time; | ||
168 | switch ( opcode ) | ||
169 | { | ||
170 | |||
171 | /* Common instructions */ | ||
172 | |||
173 | #define BRANCH( cond )\ | ||
174 | {\ | ||
175 | pc++;\ | ||
176 | int offset = (int8_t) data;\ | ||
177 | if ( cond ) {\ | ||
178 | pc += offset;\ | ||
179 | spc_time_ += 2;\ | ||
180 | }\ | ||
181 | goto loop;\ | ||
182 | } | ||
183 | |||
184 | case 0xF0: /* BEQ (most common) */ | ||
185 | BRANCH( !(uint8_t) nz ) | ||
186 | |||
187 | case 0xD0: /* BNE */ | ||
188 | BRANCH( (uint8_t) nz ) | ||
189 | |||
190 | case 0x3F: /* CALL */ | ||
191 | PUSH16( GET_PC() + 2 ); | ||
192 | SET_PC( READ_PC16( pc ) ); | ||
193 | goto loop; | ||
194 | |||
195 | case 0x6F: /* RET */ | ||
196 | SET_PC( POP() ); | ||
197 | pc += POP() * 0x100; | ||
198 | goto loop; | ||
199 | |||
200 | #define CASE( n ) case n: | ||
201 | |||
202 | /* Define common address modes based on opcode for immediate mode. Execution | ||
203 | ends with data set to the address of the operand. */ | ||
204 | #define ADDR_MODES( op )\ | ||
205 | CASE( op - 0x02 ) /* (X) */\ | ||
206 | data = x + dp;\ | ||
207 | pc--;\ | ||
208 | goto end_##op;\ | ||
209 | CASE( op + 0x0F ) /* (dp)+Y */\ | ||
210 | data = READ_PROG16( data + dp ) + y;\ | ||
211 | goto end_##op;\ | ||
212 | CASE( op - 0x01 ) /* (dp+X) */\ | ||
213 | data = READ_PROG16( ((uint8_t) (data + x)) + dp );\ | ||
214 | goto end_##op;\ | ||
215 | CASE( op + 0x0E ) /* abs+Y */\ | ||
216 | data += y;\ | ||
217 | goto abs_##op;\ | ||
218 | CASE( op + 0x0D ) /* abs+X */\ | ||
219 | data += x;\ | ||
220 | CASE( op - 0x03 ) /* abs */\ | ||
221 | abs_##op:\ | ||
222 | data += 0x100 * READ_PC( ++pc );\ | ||
223 | goto end_##op;\ | ||
224 | CASE( op + 0x0C ) /* dp+X */\ | ||
225 | data = (uint8_t) (data + x);\ | ||
226 | CASE( op - 0x04 ) /* dp */\ | ||
227 | data += dp;\ | ||
228 | end_##op: | ||
229 | |||
230 | /* 1. 8-bit Data Transmission Commands. Group I */ | ||
231 | |||
232 | ADDR_MODES( 0xE8 ) /* MOV A,addr */ | ||
233 | /*case 0xE4:*/ /* MOV a,dp (most common) */ | ||
234 | mov_a_addr: | ||
235 | a = nz = READ( data ); | ||
236 | goto inc_pc_loop; | ||
237 | case 0xBF: /* MOV A,(X)+ */ | ||
238 | data = x + dp; | ||
239 | x = (uint8_t) (x + 1); | ||
240 | pc--; | ||
241 | goto mov_a_addr; | ||
242 | |||
243 | case 0xE8: /* MOV A,imm */ | ||
244 | a = data; | ||
245 | nz = data; | ||
246 | goto inc_pc_loop; | ||
247 | |||
248 | case 0xF9: /* MOV X,dp+Y */ | ||
249 | data = (uint8_t) (data + y); | ||
250 | case 0xF8: /* MOV X,dp */ | ||
251 | data += dp; | ||
252 | goto mov_x_addr; | ||
253 | case 0xE9: /* MOV X,abs */ | ||
254 | data = READ_PC16( pc ); | ||
255 | pc++; | ||
256 | mov_x_addr: | ||
257 | data = READ( data ); | ||
258 | case 0xCD: /* MOV X,imm */ | ||
259 | x = data; | ||
260 | nz = data; | ||
261 | goto inc_pc_loop; | ||
262 | |||
263 | case 0xFB: /* MOV Y,dp+X */ | ||
264 | data = (uint8_t) (data + x); | ||
265 | case 0xEB: /* MOV Y,dp */ | ||
266 | data += dp; | ||
267 | goto mov_y_addr; | ||
268 | case 0xEC: /* MOV Y,abs */ | ||
269 | data = READ_PC16( pc ); | ||
270 | pc++; | ||
271 | mov_y_addr: | ||
272 | data = READ( data ); | ||
273 | case 0x8D: /* MOV Y,imm */ | ||
274 | y = data; | ||
275 | nz = data; | ||
276 | goto inc_pc_loop; | ||
277 | |||
278 | /* 2. 8-BIT DATA TRANSMISSION COMMANDS, GROUP 2 */ | ||
279 | |||
280 | ADDR_MODES( 0xC8 ) /* MOV addr,A */ | ||
281 | WRITE( data, a ); | ||
282 | goto inc_pc_loop; | ||
283 | |||
284 | { | ||
285 | int temp; | ||
286 | case 0xCC: /* MOV abs,Y */ | ||
287 | temp = y; | ||
288 | goto mov_abs_temp; | ||
289 | case 0xC9: /* MOV abs,X */ | ||
290 | temp = x; | ||
291 | mov_abs_temp: | ||
292 | WRITE( READ_PC16( pc ), temp ); | ||
293 | pc += 2; | ||
294 | goto loop; | ||
295 | } | ||
296 | |||
297 | case 0xD9: /* MOV dp+Y,X */ | ||
298 | data = (uint8_t) (data + y); | ||
299 | case 0xD8: /* MOV dp,X */ | ||
300 | WRITE( data + dp, x ); | ||
301 | goto inc_pc_loop; | ||
302 | |||
303 | case 0xDB: /* MOV dp+X,Y */ | ||
304 | data = (uint8_t) (data + x); | ||
305 | case 0xCB: /* MOV dp,Y */ | ||
306 | WRITE( data + dp, y ); | ||
307 | goto inc_pc_loop; | ||
308 | |||
309 | case 0xFA: /* MOV dp,dp */ | ||
310 | data = READ( data + dp ); | ||
311 | case 0x8F: /* MOV dp,#imm */ | ||
312 | WRITE_DP( READ_PC( ++pc ), data ); | ||
313 | goto inc_pc_loop; | ||
314 | |||
315 | /* 3. 8-BIT DATA TRANSMISSIN COMMANDS, GROUP 3. */ | ||
316 | |||
317 | case 0x7D: /* MOV A,X */ | ||
318 | a = x; | ||
319 | nz = x; | ||
320 | goto loop; | ||
321 | |||
322 | case 0xDD: /* MOV A,Y */ | ||
323 | a = y; | ||
324 | nz = y; | ||
325 | goto loop; | ||
326 | |||
327 | case 0x5D: /* MOV X,A */ | ||
328 | x = a; | ||
329 | nz = a; | ||
330 | goto loop; | ||
331 | |||
332 | case 0xFD: /* MOV Y,A */ | ||
333 | y = a; | ||
334 | nz = a; | ||
335 | goto loop; | ||
336 | |||
337 | case 0x9D: /* MOV X,SP */ | ||
338 | x = nz = GET_SP(); | ||
339 | goto loop; | ||
340 | |||
341 | case 0xBD: /* MOV SP,X */ | ||
342 | SET_SP( x ); | ||
343 | goto loop; | ||
344 | |||
345 | /*case 0xC6:*/ /* MOV (X),A (handled by MOV addr,A in group 2) */ | ||
346 | |||
347 | case 0xAF: /* MOV (X)+,A */ | ||
348 | WRITE_DP( x, a ); | ||
349 | x++; | ||
350 | goto loop; | ||
351 | |||
352 | /* 5. 8-BIT LOGIC OPERATION COMMANDS */ | ||
353 | |||
354 | #define LOGICAL_OP( op, func )\ | ||
355 | ADDR_MODES( op ) /* addr */\ | ||
356 | data = READ( data );\ | ||
357 | case op: /* imm */\ | ||
358 | nz = a func##= data;\ | ||
359 | goto inc_pc_loop;\ | ||
360 | { unsigned addr;\ | ||
361 | case op + 0x11: /* X,Y */\ | ||
362 | data = READ_DP( y );\ | ||
363 | addr = x + dp;\ | ||
364 | pc--;\ | ||
365 | goto addr_##op;\ | ||
366 | case op + 0x01: /* dp,dp */\ | ||
367 | data = READ_DP( data );\ | ||
368 | case op + 0x10: /*dp,imm*/\ | ||
369 | addr = READ_PC( ++pc ) + dp;\ | ||
370 | addr_##op:\ | ||
371 | nz = data func READ( addr );\ | ||
372 | WRITE( addr, nz );\ | ||
373 | goto inc_pc_loop;\ | ||
374 | } | ||
375 | |||
376 | LOGICAL_OP( 0x28, & ); /* AND */ | ||
377 | |||
378 | LOGICAL_OP( 0x08, | ); /* OR */ | ||
379 | |||
380 | LOGICAL_OP( 0x48, ^ ); /* EOR */ | ||
381 | |||
382 | /* 4. 8-BIT ARITHMETIC OPERATION COMMANDS */ | ||
383 | |||
384 | ADDR_MODES( 0x68 ) /* CMP addr */ | ||
385 | data = READ( data ); | ||
386 | case 0x68: /* CMP imm */ | ||
387 | nz = a - data; | ||
388 | c = ~nz; | ||
389 | nz &= 0xFF; | ||
390 | goto inc_pc_loop; | ||
391 | |||
392 | case 0x79: /* CMP (X),(Y) */ | ||
393 | data = READ_DP( x ); | ||
394 | nz = data - READ_DP( y ); | ||
395 | c = ~nz; | ||
396 | nz &= 0xFF; | ||
397 | goto loop; | ||
398 | |||
399 | case 0x69: /* CMP (dp),(dp) */ | ||
400 | data = READ_DP( data ); | ||
401 | case 0x78: /* CMP dp,imm */ | ||
402 | nz = READ_DP( READ_PC( ++pc ) ) - data; | ||
403 | c = ~nz; | ||
404 | nz &= 0xFF; | ||
405 | goto inc_pc_loop; | ||
406 | |||
407 | case 0x3E: /* CMP X,dp */ | ||
408 | data += dp; | ||
409 | goto cmp_x_addr; | ||
410 | case 0x1E: /* CMP X,abs */ | ||
411 | data = READ_PC16( pc ); | ||
412 | pc++; | ||
413 | cmp_x_addr: | ||
414 | data = READ( data ); | ||
415 | case 0xC8: /* CMP X,imm */ | ||
416 | nz = x - data; | ||
417 | c = ~nz; | ||
418 | nz &= 0xFF; | ||
419 | goto inc_pc_loop; | ||
420 | |||
421 | case 0x7E: /* CMP Y,dp */ | ||
422 | data += dp; | ||
423 | goto cmp_y_addr; | ||
424 | case 0x5E: /* CMP Y,abs */ | ||
425 | data = READ_PC16( pc ); | ||
426 | pc++; | ||
427 | cmp_y_addr: | ||
428 | data = READ( data ); | ||
429 | case 0xAD: /* CMP Y,imm */ | ||
430 | nz = y - data; | ||
431 | c = ~nz; | ||
432 | nz &= 0xFF; | ||
433 | goto inc_pc_loop; | ||
434 | |||
435 | { | ||
436 | int addr; | ||
437 | case 0xB9: /* SBC (x),(y) */ | ||
438 | case 0x99: /* ADC (x),(y) */ | ||
439 | pc--; /* compensate for inc later */ | ||
440 | data = READ_DP( x ); | ||
441 | addr = y + dp; | ||
442 | goto adc_addr; | ||
443 | case 0xA9: /* SBC dp,dp */ | ||
444 | case 0x89: /* ADC dp,dp */ | ||
445 | data = READ_DP( data ); | ||
446 | case 0xB8: /* SBC dp,imm */ | ||
447 | case 0x98: /* ADC dp,imm */ | ||
448 | addr = READ_PC( ++pc ) + dp; | ||
449 | adc_addr: | ||
450 | nz = READ( addr ); | ||
451 | goto adc_data; | ||
452 | |||
453 | /* catch ADC and SBC together, then decode later based on operand */ | ||
454 | #undef CASE | ||
455 | #define CASE( n ) case n: case (n) + 0x20: | ||
456 | ADDR_MODES( 0x88 ) /* ADC/SBC addr */ | ||
457 | data = READ( data ); | ||
458 | case 0xA8: /* SBC imm */ | ||
459 | case 0x88: /* ADC imm */ | ||
460 | addr = -1; /* A */ | ||
461 | nz = a; | ||
462 | adc_data: { | ||
463 | if ( opcode & 0x20 ) | ||
464 | data ^= 0xFF; /* SBC */ | ||
465 | int carry = (c >> 8) & 1; | ||
466 | int ov = (nz ^ 0x80) + carry + (int8_t) data; /* sign-extend */ | ||
467 | int hc = (nz & 15) + carry; | ||
468 | c = nz += data + carry; | ||
469 | hc = (nz & 15) - hc; | ||
470 | status = (status & ~(st_v | st_h)) | ((ov >> 2) & st_v) | | ||
471 | ((hc >> 1) & st_h); | ||
472 | if ( addr < 0 ) { | ||
473 | a = (uint8_t) nz; | ||
474 | goto inc_pc_loop; | ||
475 | } | ||
476 | WRITE( addr, (uint8_t) nz ); | ||
477 | goto inc_pc_loop; | ||
478 | } | ||
479 | |||
480 | } | ||
481 | |||
482 | /* 6. ADDITION & SUBTRACTION COMMANDS */ | ||
483 | |||
484 | #define INC_DEC_REG( reg, n )\ | ||
485 | nz = reg + n;\ | ||
486 | reg = (uint8_t) nz;\ | ||
487 | goto loop; | ||
488 | |||
489 | case 0xBC: INC_DEC_REG( a, 1 ) /* INC A */ | ||
490 | case 0x3D: INC_DEC_REG( x, 1 ) /* INC X */ | ||
491 | case 0xFC: INC_DEC_REG( y, 1 ) /* INC Y */ | ||
492 | |||
493 | case 0x9C: INC_DEC_REG( a, -1 ) /* DEC A */ | ||
494 | case 0x1D: INC_DEC_REG( x, -1 ) /* DEC X */ | ||
495 | case 0xDC: INC_DEC_REG( y, -1 ) /* DEC Y */ | ||
496 | |||
497 | case 0x9B: /* DEC dp+X */ | ||
498 | case 0xBB: /* INC dp+X */ | ||
499 | data = (uint8_t) (data + x); | ||
500 | case 0x8B: /* DEC dp */ | ||
501 | case 0xAB: /* INC dp */ | ||
502 | data += dp; | ||
503 | goto inc_abs; | ||
504 | case 0x8C: /* DEC abs */ | ||
505 | case 0xAC: /* INC abs */ | ||
506 | data = READ_PC16( pc ); | ||
507 | pc++; | ||
508 | inc_abs: | ||
509 | nz = ((opcode >> 4) & 2) - 1; | ||
510 | nz += READ( data ); | ||
511 | WRITE( data, (uint8_t) nz ); | ||
512 | goto inc_pc_loop; | ||
513 | |||
514 | /* 7. SHIFT, ROTATION COMMANDS */ | ||
515 | |||
516 | case 0x5C: /* LSR A */ | ||
517 | c = 0; | ||
518 | case 0x7C:{/* ROR A */ | ||
519 | nz = ((c >> 1) & 0x80) | (a >> 1); | ||
520 | c = a << 8; | ||
521 | a = nz; | ||
522 | goto loop; | ||
523 | } | ||
524 | |||
525 | case 0x1C: /* ASL A */ | ||
526 | c = 0; | ||
527 | case 0x3C:{/* ROL A */ | ||
528 | int temp = (c >> 8) & 1; | ||
529 | c = a << 1; | ||
530 | nz = c | temp; | ||
531 | a = (uint8_t) nz; | ||
532 | goto loop; | ||
533 | } | ||
534 | |||
535 | case 0x0B: /* ASL dp */ | ||
536 | c = 0; | ||
537 | data += dp; | ||
538 | goto rol_mem; | ||
539 | case 0x1B: /* ASL dp+X */ | ||
540 | c = 0; | ||
541 | case 0x3B: /* ROL dp+X */ | ||
542 | data = (uint8_t) (data + x); | ||
543 | case 0x2B: /* ROL dp */ | ||
544 | data += dp; | ||
545 | goto rol_mem; | ||
546 | case 0x0C: /* ASL abs */ | ||
547 | c = 0; | ||
548 | case 0x2C: /* ROL abs */ | ||
549 | data = READ_PC16( pc ); | ||
550 | pc++; | ||
551 | rol_mem: | ||
552 | nz = (c >> 8) & 1; | ||
553 | nz |= (c = READ( data ) << 1); | ||
554 | WRITE( data, (uint8_t) nz ); | ||
555 | goto inc_pc_loop; | ||
556 | |||
557 | case 0x4B: /* LSR dp */ | ||
558 | c = 0; | ||
559 | data += dp; | ||
560 | goto ror_mem; | ||
561 | case 0x5B: /* LSR dp+X */ | ||
562 | c = 0; | ||
563 | case 0x7B: /* ROR dp+X */ | ||
564 | data = (uint8_t) (data + x); | ||
565 | case 0x6B: /* ROR dp */ | ||
566 | data += dp; | ||
567 | goto ror_mem; | ||
568 | case 0x4C: /* LSR abs */ | ||
569 | c = 0; | ||
570 | case 0x6C: /* ROR abs */ | ||
571 | data = READ_PC16( pc ); | ||
572 | pc++; | ||
573 | ror_mem: { | ||
574 | int temp = READ( data ); | ||
575 | nz = ((c >> 1) & 0x80) | (temp >> 1); | ||
576 | c = temp << 8; | ||
577 | WRITE( data, nz ); | ||
578 | goto inc_pc_loop; | ||
579 | } | ||
580 | |||
581 | case 0x9F: /* XCN */ | ||
582 | nz = a = (a >> 4) | (uint8_t) (a << 4); | ||
583 | goto loop; | ||
584 | |||
585 | /* 8. 16-BIT TRANSMISION COMMANDS */ | ||
586 | |||
587 | case 0xBA: /* MOVW YA,dp */ | ||
588 | a = READ_DP( data ); | ||
589 | nz = (a & 0x7F) | (a >> 1); | ||
590 | y = READ_DP( (uint8_t) (data + 1) ); | ||
591 | nz |= y; | ||
592 | goto inc_pc_loop; | ||
593 | |||
594 | case 0xDA: /* MOVW dp,YA */ | ||
595 | WRITE_DP( data, a ); | ||
596 | WRITE_DP( (uint8_t) (data + 1), y ); | ||
597 | goto inc_pc_loop; | ||
598 | |||
599 | /* 9. 16-BIT OPERATION COMMANDS */ | ||
600 | |||
601 | case 0x3A: /* INCW dp */ | ||
602 | case 0x1A:{/* DECW dp */ | ||
603 | data += dp; | ||
604 | |||
605 | /* low byte */ | ||
606 | int temp = READ( data ); | ||
607 | temp += ((opcode >> 4) & 2) - 1; /* +1 for INCW, -1 for DECW */ | ||
608 | nz = ((temp >> 1) | temp) & 0x7F; | ||
609 | WRITE( data, (uint8_t) temp ); | ||
610 | |||
611 | /* high byte */ | ||
612 | data = ((uint8_t) (data + 1)) + dp; | ||
613 | temp >>= 8; | ||
614 | temp = (uint8_t) (temp + READ( data )); | ||
615 | nz |= temp; | ||
616 | WRITE( data, temp ); | ||
617 | |||
618 | goto inc_pc_loop; | ||
619 | } | ||
620 | |||
621 | case 0x9A: /* SUBW YA,dp */ | ||
622 | case 0x7A: /* ADDW YA,dp */ | ||
623 | { | ||
624 | /* read 16-bit addend */ | ||
625 | int temp = READ_DP( data ); | ||
626 | int sign = READ_DP( (uint8_t) (data + 1) ); | ||
627 | temp += 0x100 * sign; | ||
628 | status &= ~(st_v | st_h); | ||
629 | |||
630 | /* to do: fix half-carry for SUBW (it's probably wrong) */ | ||
631 | |||
632 | /* for SUBW, negate and truncate to 16 bits */ | ||
633 | if ( opcode & 0x80 ) { | ||
634 | temp = (temp ^ 0xFFFF) + 1; | ||
635 | sign = temp >> 8; | ||
636 | } | ||
637 | |||
638 | /* add low byte (A) */ | ||
639 | temp += a; | ||
640 | a = (uint8_t) temp; | ||
641 | nz = (temp | (temp >> 1)) & 0x7F; | ||
642 | |||
643 | /* add high byte (Y) */ | ||
644 | temp >>= 8; | ||
645 | c = y + temp; | ||
646 | nz = (nz | c) & 0xFF; | ||
647 | |||
648 | /* half-carry (temporary avoids CodeWarrior optimizer bug) */ | ||
649 | unsigned hc = (c & 15) - (y & 15); | ||
650 | status |= (hc >> 4) & st_h; | ||
651 | |||
652 | /* overflow if sign of YA changed when previous sign | ||
653 | and addend sign were same */ | ||
654 | status |= (((c ^ y) & ~(y ^ sign)) >> 1) & st_v; | ||
655 | |||
656 | y = (uint8_t) c; | ||
657 | |||
658 | goto inc_pc_loop; | ||
659 | } | ||
660 | |||
661 | case 0x5A: { /* CMPW YA,dp */ | ||
662 | int temp = a - READ_DP( data ); | ||
663 | nz = ((temp >> 1) | temp) & 0x7F; | ||
664 | temp = y + (temp >> 8); | ||
665 | temp -= READ_DP( (uint8_t) (data + 1) ); | ||
666 | nz |= temp; | ||
667 | c = ~temp; | ||
668 | nz &= 0xFF; | ||
669 | goto inc_pc_loop; | ||
670 | } | ||
671 | |||
672 | /* 10. MULTIPLICATION & DIVISON COMMANDS */ | ||
673 | |||
674 | case 0xCF: { /* MUL YA */ | ||
675 | unsigned temp = y * a; | ||
676 | a = (uint8_t) temp; | ||
677 | nz = ((temp >> 1) | temp) & 0x7F; | ||
678 | y = temp >> 8; | ||
679 | nz |= y; | ||
680 | goto loop; | ||
681 | } | ||
682 | |||
683 | case 0x9E: /* DIV YA,X */ | ||
684 | { | ||
685 | /* behavior based on SPC CPU tests */ | ||
686 | |||
687 | status &= ~(st_h | st_v); | ||
688 | |||
689 | if ( (y & 15) >= (x & 15) ) | ||
690 | status |= st_h; | ||
691 | |||
692 | if ( y >= x ) | ||
693 | status |= st_v; | ||
694 | |||
695 | unsigned ya = y * 0x100 + a; | ||
696 | if ( y < x * 2 ) | ||
697 | { | ||
698 | a = ya / x; | ||
699 | y = ya - a * x; | ||
700 | } | ||
701 | else | ||
702 | { | ||
703 | a = 255 - (ya - x * 0x200) / (256 - x); | ||
704 | y = x + (ya - x * 0x200) % (256 - x); | ||
705 | } | ||
706 | |||
707 | nz = (uint8_t) a; | ||
708 | a = (uint8_t) a; | ||
709 | |||
710 | goto loop; | ||
711 | } | ||
712 | |||
713 | /* 11. DECIMAL COMPENSATION COMMANDS */ | ||
714 | |||
715 | /* seem unused */ | ||
716 | /* case 0xDF: */ /* DAA */ | ||
717 | /* case 0xBE: */ /* DAS */ | ||
718 | |||
719 | /* 12. BRANCHING COMMANDS */ | ||
720 | |||
721 | case 0x2F: /* BRA rel */ | ||
722 | pc += (int8_t) data; | ||
723 | goto inc_pc_loop; | ||
724 | |||
725 | case 0x30: /* BMI */ | ||
726 | BRANCH( IS_NEG ) | ||
727 | |||
728 | case 0x10: /* BPL */ | ||
729 | BRANCH( !IS_NEG ) | ||
730 | |||
731 | case 0xB0: /* BCS */ | ||
732 | BRANCH( c & 0x100 ) | ||
733 | |||
734 | case 0x90: /* BCC */ | ||
735 | BRANCH( !(c & 0x100) ) | ||
736 | |||
737 | case 0x70: /* BVS */ | ||
738 | BRANCH( status & st_v ) | ||
739 | |||
740 | case 0x50: /* BVC */ | ||
741 | BRANCH( !(status & st_v) ) | ||
742 | |||
743 | case 0x03: /* BBS dp.bit,rel */ | ||
744 | case 0x23: | ||
745 | case 0x43: | ||
746 | case 0x63: | ||
747 | case 0x83: | ||
748 | case 0xA3: | ||
749 | case 0xC3: | ||
750 | case 0xE3: | ||
751 | pc++; | ||
752 | if ( (READ_DP( data ) >> (opcode >> 5)) & 1 ) | ||
753 | goto cbranch_taken_loop; | ||
754 | goto inc_pc_loop; | ||
755 | |||
756 | case 0x13: /* BBC dp.bit,rel */ | ||
757 | case 0x33: | ||
758 | case 0x53: | ||
759 | case 0x73: | ||
760 | case 0x93: | ||
761 | case 0xB3: | ||
762 | case 0xD3: | ||
763 | case 0xF3: | ||
764 | pc++; | ||
765 | if ( !((READ_DP( data ) >> (opcode >> 5)) & 1) ) | ||
766 | goto cbranch_taken_loop; | ||
767 | goto inc_pc_loop; | ||
768 | |||
769 | case 0xDE: /* CBNE dp+X,rel */ | ||
770 | data = (uint8_t) (data + x); | ||
771 | /* fall through */ | ||
772 | case 0x2E: /* CBNE dp,rel */ | ||
773 | pc++; | ||
774 | if ( READ_DP( data ) != a ) | ||
775 | goto cbranch_taken_loop; | ||
776 | goto inc_pc_loop; | ||
777 | |||
778 | case 0xFE: /* DBNZ Y,rel */ | ||
779 | y = (uint8_t) (y - 1); | ||
780 | BRANCH( y ) | ||
781 | |||
782 | case 0x6E: { /* DBNZ dp,rel */ | ||
783 | pc++; | ||
784 | unsigned temp = READ_DP( data ) - 1; | ||
785 | WRITE_DP( (uint8_t) data, (uint8_t) temp ); | ||
786 | if ( temp ) | ||
787 | goto cbranch_taken_loop; | ||
788 | goto inc_pc_loop; | ||
789 | } | ||
790 | |||
791 | case 0x1F: /* JMP (abs+X) */ | ||
792 | SET_PC( READ_PC16( pc ) + x ); | ||
793 | /* fall through */ | ||
794 | case 0x5F: /* JMP abs */ | ||
795 | SET_PC( READ_PC16( pc ) ); | ||
796 | goto loop; | ||
797 | |||
798 | /* 13. SUB-ROUTINE CALL RETURN COMMANDS */ | ||
799 | |||
800 | case 0x0F:{/* BRK */ | ||
801 | check( 0 ); /* untested */ | ||
802 | PUSH16( GET_PC() + 1 ); | ||
803 | SET_PC( READ_PROG16( 0xFFDE ) ); /* vector address verified */ | ||
804 | int temp; | ||
805 | CALC_STATUS( temp ); | ||
806 | PUSH( temp ); | ||
807 | status = (status | st_b) & ~st_i; | ||
808 | goto loop; | ||
809 | } | ||
810 | |||
811 | case 0x4F: /* PCALL offset */ | ||
812 | PUSH16( GET_PC() + 1 ); | ||
813 | SET_PC( 0xFF00 + data ); | ||
814 | goto loop; | ||
815 | |||
816 | case 0x01: /* TCALL n */ | ||
817 | case 0x11: | ||
818 | case 0x21: | ||
819 | case 0x31: | ||
820 | case 0x41: | ||
821 | case 0x51: | ||
822 | case 0x61: | ||
823 | case 0x71: | ||
824 | case 0x81: | ||
825 | case 0x91: | ||
826 | case 0xA1: | ||
827 | case 0xB1: | ||
828 | case 0xC1: | ||
829 | case 0xD1: | ||
830 | case 0xE1: | ||
831 | case 0xF1: | ||
832 | PUSH16( GET_PC() ); | ||
833 | SET_PC( READ_PROG16( 0xFFDE - (opcode >> 3) ) ); | ||
834 | goto loop; | ||
835 | |||
836 | /* 14. STACK OPERATION COMMANDS */ | ||
837 | |||
838 | { | ||
839 | int temp; | ||
840 | case 0x7F: /* RET1 */ | ||
841 | temp = POP(); | ||
842 | SET_PC( POP() ); | ||
843 | pc += POP() << 8; | ||
844 | goto set_status; | ||
845 | case 0x8E: /* POP PSW */ | ||
846 | temp = POP(); | ||
847 | set_status: | ||
848 | SET_STATUS( temp ); | ||
849 | goto loop; | ||
850 | } | ||
851 | |||
852 | case 0x0D: { /* PUSH PSW */ | ||
853 | int temp; | ||
854 | CALC_STATUS( temp ); | ||
855 | PUSH( temp ); | ||
856 | goto loop; | ||
857 | } | ||
858 | |||
859 | case 0x2D: /* PUSH A */ | ||
860 | PUSH( a ); | ||
861 | goto loop; | ||
862 | |||
863 | case 0x4D: /* PUSH X */ | ||
864 | PUSH( x ); | ||
865 | goto loop; | ||
866 | |||
867 | case 0x6D: /* PUSH Y */ | ||
868 | PUSH( y ); | ||
869 | goto loop; | ||
870 | |||
871 | case 0xAE: /* POP A */ | ||
872 | a = POP(); | ||
873 | goto loop; | ||
874 | |||
875 | case 0xCE: /* POP X */ | ||
876 | x = POP(); | ||
877 | goto loop; | ||
878 | |||
879 | case 0xEE: /* POP Y */ | ||
880 | y = POP(); | ||
881 | goto loop; | ||
882 | |||
883 | /* 15. BIT OPERATION COMMANDS */ | ||
884 | |||
885 | case 0x02: /* SET1 */ | ||
886 | case 0x22: | ||
887 | case 0x42: | ||
888 | case 0x62: | ||
889 | case 0x82: | ||
890 | case 0xA2: | ||
891 | case 0xC2: | ||
892 | case 0xE2: | ||
893 | case 0x12: /* CLR1 */ | ||
894 | case 0x32: | ||
895 | case 0x52: | ||
896 | case 0x72: | ||
897 | case 0x92: | ||
898 | case 0xB2: | ||
899 | case 0xD2: | ||
900 | case 0xF2: { | ||
901 | data += dp; | ||
902 | int bit = 1 << (opcode >> 5); | ||
903 | int mask = ~bit; | ||
904 | if ( opcode & 0x10 ) | ||
905 | bit = 0; | ||
906 | WRITE( data, (READ( data ) & mask) | bit ); | ||
907 | goto inc_pc_loop; | ||
908 | } | ||
909 | |||
910 | case 0x0E: /* TSET1 abs */ | ||
911 | case 0x4E:{/* TCLR1 abs */ | ||
912 | data = READ_PC16( pc ); | ||
913 | pc += 2; | ||
914 | unsigned temp = READ( data ); | ||
915 | nz = temp & a; | ||
916 | temp &= ~a; | ||
917 | if ( !(opcode & 0x40) ) | ||
918 | temp |= a; | ||
919 | WRITE( data, temp ); | ||
920 | goto loop; | ||
921 | } | ||
922 | |||
923 | case 0x4A: /* AND1 C,mem.bit */ | ||
924 | c &= MEM_BIT(); | ||
925 | pc += 2; | ||
926 | goto loop; | ||
927 | |||
928 | case 0x6A: /* AND1 C,/mem.bit */ | ||
929 | check( 0 ); /* untested */ | ||
930 | c &= ~MEM_BIT(); | ||
931 | pc += 2; | ||
932 | goto loop; | ||
933 | |||
934 | case 0x0A: /* OR1 C,mem.bit */ | ||
935 | check( 0 ); /* untested */ | ||
936 | c |= MEM_BIT(); | ||
937 | pc += 2; | ||
938 | goto loop; | ||
939 | |||
940 | case 0x2A: /* OR1 C,/mem.bit */ | ||
941 | check( 0 ); /* untested */ | ||
942 | c |= ~MEM_BIT(); | ||
943 | pc += 2; | ||
944 | goto loop; | ||
945 | |||
946 | case 0x8A: /* EOR1 C,mem.bit */ | ||
947 | c ^= MEM_BIT(); | ||
948 | pc += 2; | ||
949 | goto loop; | ||
950 | |||
951 | case 0xEA: { /* NOT1 mem.bit */ | ||
952 | data = READ_PC16( pc ); | ||
953 | pc += 2; | ||
954 | unsigned temp = READ( data & 0x1FFF ); | ||
955 | temp ^= 1 << (data >> 13); | ||
956 | WRITE( data & 0x1FFF, temp ); | ||
957 | goto loop; | ||
958 | } | ||
959 | |||
960 | case 0xCA: { /* MOV1 mem.bit,C */ | ||
961 | data = READ_PC16( pc ); | ||
962 | pc += 2; | ||
963 | unsigned temp = READ( data & 0x1FFF ); | ||
964 | unsigned bit = data >> 13; | ||
965 | temp = (temp & ~(1 << bit)) | (((c >> 8) & 1) << bit); | ||
966 | WRITE( data & 0x1FFF, temp ); | ||
967 | goto loop; | ||
968 | } | ||
969 | |||
970 | case 0xAA: /* MOV1 C,mem.bit */ | ||
971 | c = MEM_BIT(); | ||
972 | pc += 2; | ||
973 | goto loop; | ||
974 | |||
975 | /* 16. PROGRAM STATUS FLAG OPERATION COMMANDS */ | ||
976 | |||
977 | case 0x60: /* CLRC */ | ||
978 | c = 0; | ||
979 | goto loop; | ||
980 | |||
981 | case 0x80: /* SETC */ | ||
982 | c = ~0; | ||
983 | goto loop; | ||
984 | |||
985 | case 0xED: /* NOTC */ | ||
986 | c ^= 0x100; | ||
987 | goto loop; | ||
988 | |||
989 | case 0xE0: /* CLRV */ | ||
990 | status &= ~(st_v | st_h); | ||
991 | goto loop; | ||
992 | |||
993 | case 0x20: /* CLRP */ | ||
994 | dp = 0; | ||
995 | goto loop; | ||
996 | |||
997 | case 0x40: /* SETP */ | ||
998 | dp = 0x100; | ||
999 | goto loop; | ||
1000 | |||
1001 | case 0xA0: /* EI */ | ||
1002 | check( 0 ); /* untested */ | ||
1003 | status |= st_i; | ||
1004 | goto loop; | ||
1005 | |||
1006 | case 0xC0: /* DI */ | ||
1007 | check( 0 ); /* untested */ | ||
1008 | status &= ~st_i; | ||
1009 | goto loop; | ||
1010 | |||
1011 | /* 17. OTHER COMMANDS */ | ||
1012 | |||
1013 | case 0x00: /* NOP */ | ||
1014 | goto loop; | ||
1015 | |||
1016 | /*case 0xEF:*/ /* SLEEP */ | ||
1017 | /*case 0xFF:*/ /* STOP */ | ||
1018 | case 0xFF: | ||
1019 | c |= 1; /* force switch table to have 256 entries, | ||
1020 | hopefully helping optimizer */ | ||
1021 | } /* switch */ | ||
1022 | |||
1023 | /* unhandled instructions fall out of switch so emulator can catch them */ | ||
1024 | |||
1025 | out_of_time: | ||
1026 | /* undo partial execution of opcode */ | ||
1027 | spc_time_ -= this->cycle_table [*--pc]; | ||
1028 | { | ||
1029 | int temp; | ||
1030 | CALC_STATUS( temp ); | ||
1031 | this->r.status = (uint8_t) temp; | ||
1032 | } | ||
1033 | |||
1034 | this->r.pc = GET_PC(); | ||
1035 | this->r.sp = (uint8_t) GET_SP(); | ||
1036 | this->r.a = (uint8_t) a; | ||
1037 | this->r.x = (uint8_t) x; | ||
1038 | this->r.y = (uint8_t) y; | ||
1039 | |||
1040 | #if 0 | ||
1041 | EXIT_TIMER(cpu); | ||
1042 | #endif | ||
1043 | return spc_time_; | ||
1044 | } | ||
1045 | |||
1046 | void CPU_Init( THIS ) | ||
1047 | { | ||
1048 | ci->memcpy( this->cycle_table, cycle_table, sizeof cycle_table ); | ||
1049 | } | ||
1050 | |||