Codes.h 12 KB

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  1. /** M6502: portable 6502 emulator ****************************/
  2. /** **/
  3. /** Codes.h **/
  4. /** **/
  5. /** This file contains implementation for the main table of **/
  6. /** 6502 commands. It is included from 6502.c. **/
  7. /** **/
  8. /** Copyright (C) Marat Fayzullin 1996-2002 **/
  9. /** Alex Krasivsky 1996 **/
  10. /** You are not allowed to distribute this software **/
  11. /** commercially. Please, notify me, if you make any **/
  12. /** changes to this file. **/
  13. /*************************************************************/
  14. /*
  15. * $LastChangedDate$
  16. * $Author$
  17. * $HeadURL$
  18. * $Revision$
  19. */
  20. case 0x10:
  21. if (R->P & N_FLAG)
  22. R->PC.W++;
  23. else
  24. {
  25. M_JR;
  26. } break; /* BPL * REL */
  27. case 0x30:
  28. if (R->P & N_FLAG)
  29. {
  30. M_JR;
  31. }
  32. else
  33. R->PC.W++;
  34. break; /* BMI * REL */
  35. case 0xD0:
  36. if (R->P & Z_FLAG)
  37. R->PC.W++;
  38. else
  39. {
  40. M_JR;
  41. } break; /* BNE * REL */
  42. case 0xF0:
  43. if (R->P & Z_FLAG)
  44. {
  45. M_JR;
  46. }
  47. else
  48. R->PC.W++;
  49. break; /* BEQ * REL */
  50. case 0x90:
  51. if (R->P & C_FLAG)
  52. R->PC.W++;
  53. else
  54. {
  55. M_JR;
  56. } break; /* BCC * REL */
  57. case 0xB0:
  58. if (R->P & C_FLAG)
  59. {
  60. M_JR;
  61. }
  62. else
  63. R->PC.W++;
  64. break; /* BCS * REL */
  65. case 0x50:
  66. if (R->P & V_FLAG)
  67. R->PC.W++;
  68. else
  69. {
  70. M_JR;
  71. } break; /* BVC * REL */
  72. case 0x70:
  73. if (R->P & V_FLAG)
  74. {
  75. M_JR;
  76. }
  77. else
  78. R->PC.W++;
  79. break; /* BVS * REL */
  80. /* RTI */
  81. case 0x40:
  82. M_POP(R->P);
  83. //R->P |= R_FLAG;
  84. M_POP(R->PC.B.l);
  85. M_POP(R->PC.B.h);
  86. break;
  87. /* RTS */
  88. case 0x60:
  89. M_POP(R->PC.B.l);
  90. M_POP(R->PC.B.h);
  91. R->PC.W++;
  92. break;
  93. /* JSR $ssss ABS */
  94. case 0x20:
  95. K.B.l = Op6502(R->PC.W++);
  96. K.B.h = Op6502(R->PC.W);
  97. M_PUSH(R->PC.B.h);
  98. M_PUSH(R->PC.B.l);
  99. R->PC = K;
  100. break;
  101. /* JMP $ssss ABS */
  102. case 0x4C:
  103. M_LDWORD(K);
  104. R->PC = K;
  105. break;
  106. /* JMP ($ssss) ABDINDIR */
  107. case 0x6C:
  108. M_LDWORD(K);
  109. R->PC.B.l = Rd6502(K.W);
  110. K.B.l++;
  111. R->PC.B.h = Rd6502(K.W);
  112. break;
  113. /* BRK */
  114. case 0x00:
  115. R->PC.W++;
  116. M_PUSH(R->PC.B.h);
  117. M_PUSH(R->PC.B.l);
  118. M_PUSH(R->P | B_FLAG);
  119. R->P = (R->P | I_FLAG) & ~D_FLAG;
  120. R->PC.B.l = Rd6502(0xFFFE);
  121. R->PC.B.h = Rd6502(0xFFFF);
  122. break;
  123. /* CLI */
  124. case 0x58:
  125. if ((R->IRequest != INT_NONE) && (R->P & I_FLAG))
  126. {
  127. R->AfterCLI = 1;
  128. R->IBackup = R->ICount;
  129. R->ICount = 1;
  130. }
  131. R->P &= ~I_FLAG;
  132. break;
  133. /* PLP */
  134. case 0x28:
  135. M_POP(I);
  136. if ((R->IRequest != INT_NONE) && ((I ^ R->P) & ~I & I_FLAG))
  137. {
  138. R->AfterCLI = 1;
  139. R->IBackup = R->ICount;
  140. R->ICount = 1;
  141. }
  142. R->P = I /*| R_FLAG*/ | B_FLAG;
  143. break;
  144. case 0x08:
  145. M_PUSH(R->P);
  146. break; /* PHP */
  147. case 0x18:
  148. R->P &= ~C_FLAG;
  149. break; /* CLC */
  150. case 0xB8:
  151. R->P &= ~V_FLAG;
  152. break; /* CLV */
  153. case 0xD8:
  154. R->P &= ~D_FLAG;
  155. break; /* CLD */
  156. case 0x38:
  157. R->P |= C_FLAG;
  158. break; /* SEC */
  159. case 0xF8:
  160. R->P |= D_FLAG;
  161. break; /* SED */
  162. case 0x78:
  163. R->P |= I_FLAG;
  164. break; /* SEI */
  165. case 0x48:
  166. M_PUSH(R->A);
  167. break; /* PHA */
  168. case 0x68:
  169. M_POP(R->A);
  170. M_FL(R->A);
  171. break; /* PLA */
  172. case 0x98:
  173. R->A = R->Y;
  174. M_FL(R->A);
  175. break; /* TYA */
  176. case 0xA8:
  177. R->Y = R->A;
  178. M_FL(R->Y);
  179. break; /* TAY */
  180. case 0xC8:
  181. R->Y++;
  182. M_FL(R->Y);
  183. break; /* INY */
  184. case 0x88:
  185. R->Y--;
  186. M_FL(R->Y);
  187. break; /* DEY */
  188. case 0x8A:
  189. R->A = R->X;
  190. M_FL(R->A);
  191. break; /* TXA */
  192. case 0xAA:
  193. R->X = R->A;
  194. M_FL(R->X);
  195. break; /* TAX */
  196. case 0xE8:
  197. R->X++;
  198. M_FL(R->X);
  199. break; /* INX */
  200. case 0xCA:
  201. R->X--;
  202. M_FL(R->X);
  203. break; /* DEX */
  204. default: /* In CMOS version unrecognized instructions are concidered as
  205. NOP */
  206. case 0xEA:
  207. break; /* NOP */
  208. case 0x9A:
  209. R->S = R->X;
  210. break; /* TXS */
  211. case 0xBA:
  212. R->X = R->S;
  213. M_FL(R->X);
  214. break; /* TSX */
  215. case 0x24:
  216. MR_Zp(I);
  217. M_BIT(I);
  218. break; /* BIT $ss ZP */
  219. case 0x2C:
  220. MR_Ab(I);
  221. M_BIT(I);
  222. break; /* BIT $ssss ABS */
  223. case 0x05:
  224. MR_Zp(I);
  225. M_ORA(I);
  226. break; /* ORA $ss ZP */
  227. case 0x06:
  228. MM_Zp(M_ASL);
  229. break; /* ASL $ss ZP */
  230. case 0x25:
  231. MR_Zp(I);
  232. M_AND(I);
  233. break; /* AND $ss ZP */
  234. case 0x26:
  235. MM_Zp(M_ROL);
  236. break; /* ROL $ss ZP */
  237. case 0x45:
  238. MR_Zp(I);
  239. M_EOR(I);
  240. break; /* EOR $ss ZP */
  241. case 0x46:
  242. MM_Zp(M_LSR);
  243. break; /* LSR $ss ZP */
  244. case 0x65:
  245. MR_Zp(I);
  246. M_ADC(I);
  247. break; /* ADC $ss ZP */
  248. case 0x66:
  249. MM_Zp(M_ROR);
  250. break; /* ROR $ss ZP */
  251. case 0x84:
  252. MW_Zp(R->Y);
  253. break; /* STY $ss ZP */
  254. case 0x85:
  255. MW_Zp(R->A);
  256. break; /* STA $ss ZP */
  257. case 0x86:
  258. MW_Zp(R->X);
  259. break; /* STX $ss ZP */
  260. case 0xA4:
  261. MR_Zp(R->Y);
  262. M_FL(R->Y);
  263. break; /* LDY $ss ZP */
  264. case 0xA5:
  265. MR_Zp(R->A);
  266. M_FL(R->A);
  267. break; /* LDA $ss ZP */
  268. case 0xA6:
  269. MR_Zp(R->X);
  270. M_FL(R->X);
  271. break; /* LDX $ss ZP */
  272. case 0xC4:
  273. MR_Zp(I);
  274. M_CMP(R->Y, I);
  275. break; /* CPY $ss ZP */
  276. case 0xC5:
  277. MR_Zp(I);
  278. M_CMP(R->A, I);
  279. break; /* CMP $ss ZP */
  280. case 0xC6:
  281. MM_Zp(M_DEC);
  282. break; /* DEC $ss ZP */
  283. case 0xE4:
  284. MR_Zp(I);
  285. M_CMP(R->X, I);
  286. break; /* CPX $ss ZP */
  287. case 0xE5:
  288. MR_Zp(I);
  289. M_SBC(I);
  290. break; /* SBC $ss ZP */
  291. case 0xE6:
  292. MM_Zp(M_INC);
  293. break; /* INC $ss ZP */
  294. case 0x0D:
  295. MR_Ab(I);
  296. M_ORA(I);
  297. break; /* ORA $ssss ABS */
  298. case 0x0E:
  299. MM_Ab(M_ASL);
  300. break; /* ASL $ssss ABS */
  301. case 0x2D:
  302. MR_Ab(I);
  303. M_AND(I);
  304. break; /* AND $ssss ABS */
  305. case 0x2E:
  306. MM_Ab(M_ROL);
  307. break; /* ROL $ssss ABS */
  308. case 0x4D:
  309. MR_Ab(I);
  310. M_EOR(I);
  311. break; /* EOR $ssss ABS */
  312. case 0x4E:
  313. MM_Ab(M_LSR);
  314. break; /* LSR $ssss ABS */
  315. case 0x6D:
  316. MR_Ab(I);
  317. M_ADC(I);
  318. break; /* ADC $ssss ABS */
  319. case 0x6E:
  320. MM_Ab(M_ROR);
  321. break; /* ROR $ssss ABS */
  322. case 0x8C:
  323. MW_Ab(R->Y);
  324. break; /* STY $ssss ABS */
  325. case 0x8D:
  326. MW_Ab(R->A);
  327. break; /* STA $ssss ABS */
  328. case 0x8E:
  329. MW_Ab(R->X);
  330. break; /* STX $ssss ABS */
  331. case 0xAC:
  332. MR_Ab(R->Y);
  333. M_FL(R->Y);
  334. break; /* LDY $ssss ABS */
  335. case 0xAD:
  336. MR_Ab(R->A);
  337. M_FL(R->A);
  338. break; /* LDA $ssss ABS */
  339. case 0xAE:
  340. MR_Ab(R->X);
  341. M_FL(R->X);
  342. break; /* LDX $ssss ABS */
  343. case 0xCC:
  344. MR_Ab(I);
  345. M_CMP(R->Y, I);
  346. break; /* CPY $ssss ABS */
  347. case 0xCD:
  348. MR_Ab(I);
  349. M_CMP(R->A, I);
  350. break; /* CMP $ssss ABS */
  351. case 0xCE:
  352. MM_Ab(M_DEC);
  353. break; /* DEC $ssss ABS */
  354. case 0xEC:
  355. MR_Ab(I);
  356. M_CMP(R->X, I);
  357. break; /* CPX $ssss ABS */
  358. case 0xED:
  359. MR_Ab(I);
  360. M_SBC(I);
  361. break; /* SBC $ssss ABS */
  362. case 0xEE:
  363. MM_Ab(M_INC);
  364. break; /* INC $ssss ABS */
  365. case 0x09:
  366. MR_Im(I);
  367. M_ORA(I);
  368. break; /* ORA #$ss IMM */
  369. case 0x29:
  370. MR_Im(I);
  371. M_AND(I);
  372. break; /* AND #$ss IMM */
  373. case 0x49:
  374. MR_Im(I);
  375. M_EOR(I);
  376. break; /* EOR #$ss IMM */
  377. case 0x69:
  378. MR_Im(I);
  379. M_ADC(I);
  380. break; /* ADC #$ss IMM */
  381. case 0xA0:
  382. MR_Im(R->Y);
  383. M_FL(R->Y);
  384. break; /* LDY #$ss IMM */
  385. case 0xA2:
  386. MR_Im(R->X);
  387. M_FL(R->X);
  388. break; /* LDX #$ss IMM */
  389. case 0xA9:
  390. MR_Im(R->A);
  391. M_FL(R->A);
  392. break; /* LDA #$ss IMM */
  393. case 0xC0:
  394. MR_Im(I);
  395. M_CMP(R->Y, I);
  396. break; /* CPY #$ss IMM */
  397. case 0xC9:
  398. MR_Im(I);
  399. M_CMP(R->A, I);
  400. break; /* CMP #$ss IMM */
  401. case 0xE0:
  402. MR_Im(I);
  403. M_CMP(R->X, I);
  404. break; /* CPX #$ss IMM */
  405. case 0xE9:
  406. MR_Im(I);
  407. M_SBC(I);
  408. break; /* SBC #$ss IMM */
  409. case 0x15:
  410. MR_Zx(I);
  411. M_ORA(I);
  412. break; /* ORA $ss,x ZP,x */
  413. case 0x16:
  414. MM_Zx(M_ASL);
  415. break; /* ASL $ss,x ZP,x */
  416. case 0x35:
  417. MR_Zx(I);
  418. M_AND(I);
  419. break; /* AND $ss,x ZP,x */
  420. case 0x36:
  421. MM_Zx(M_ROL);
  422. break; /* ROL $ss,x ZP,x */
  423. case 0x55:
  424. MR_Zx(I);
  425. M_EOR(I);
  426. break; /* EOR $ss,x ZP,x */
  427. case 0x56:
  428. MM_Zx(M_LSR);
  429. break; /* LSR $ss,x ZP,x */
  430. case 0x75:
  431. MR_Zx(I);
  432. M_ADC(I);
  433. break; /* ADC $ss,x ZP,x */
  434. case 0x76:
  435. MM_Zx(M_ROR);
  436. break; /* ROR $ss,x ZP,x */
  437. case 0x94:
  438. MW_Zx(R->Y);
  439. break; /* STY $ss,x ZP,x */
  440. case 0x95:
  441. MW_Zx(R->A);
  442. break; /* STA $ss,x ZP,x */
  443. case 0x96:
  444. MW_Zy(R->X);
  445. break; /* STX $ss,y ZP,y */
  446. case 0xB4:
  447. MR_Zx(R->Y);
  448. M_FL(R->Y);
  449. break; /* LDY $ss,x ZP,x */
  450. case 0xB5:
  451. MR_Zx(R->A);
  452. M_FL(R->A);
  453. break; /* LDA $ss,x ZP,x */
  454. case 0xB6:
  455. MR_Zy(R->X);
  456. M_FL(R->X);
  457. break; /* LDX $ss,y ZP,y */
  458. case 0xD5:
  459. MR_Zx(I);
  460. M_CMP(R->A, I);
  461. break; /* CMP $ss,x ZP,x */
  462. case 0xD6:
  463. MM_Zx(M_DEC);
  464. break; /* DEC $ss,x ZP,x */
  465. case 0xF5:
  466. MR_Zx(I);
  467. M_SBC(I);
  468. break; /* SBC $ss,x ZP,x */
  469. case 0xF6:
  470. MM_Zx(M_INC);
  471. break; /* INC $ss,x ZP,x */
  472. case 0x19:
  473. MR_Ay(I);
  474. M_ORA(I);
  475. break; /* ORA $ssss,y ABS,y */
  476. case 0x1D:
  477. MR_Ax(I);
  478. M_ORA(I);
  479. break; /* ORA $ssss,x ABS,x */
  480. case 0x1E:
  481. MM_Ax(M_ASL);
  482. break; /* ASL $ssss,x ABS,x */
  483. case 0x39:
  484. MR_Ay(I);
  485. M_AND(I);
  486. break; /* AND $ssss,y ABS,y */
  487. case 0x3D:
  488. MR_Ax(I);
  489. M_AND(I);
  490. break; /* AND $ssss,x ABS,x */
  491. case 0x3E:
  492. MM_Ax(M_ROL);
  493. break; /* ROL $ssss,x ABS,x */
  494. case 0x59:
  495. MR_Ay(I);
  496. M_EOR(I);
  497. break; /* EOR $ssss,y ABS,y */
  498. case 0x5D:
  499. MR_Ax(I);
  500. M_EOR(I);
  501. break; /* EOR $ssss,x ABS,x */
  502. case 0x5E:
  503. MM_Ax(M_LSR);
  504. break; /* LSR $ssss,x ABS,x */
  505. case 0x79:
  506. MR_Ay(I);
  507. M_ADC(I);
  508. break; /* ADC $ssss,y ABS,y */
  509. case 0x7D:
  510. MR_Ax(I);
  511. M_ADC(I);
  512. break; /* ADC $ssss,x ABS,x */
  513. case 0x7E:
  514. MM_Ax(M_ROR);
  515. break; /* ROR $ssss,x ABS,x */
  516. case 0x99:
  517. MW_Ay(R->A);
  518. break; /* STA $ssss,y ABS,y */
  519. case 0x9D:
  520. MW_Ax(R->A);
  521. break; /* STA $ssss,x ABS,x */
  522. case 0xB9:
  523. MR_Ay(R->A);
  524. M_FL(R->A);
  525. break; /* LDA $ssss,y ABS,y */
  526. case 0xBC:
  527. MR_Ax(R->Y);
  528. M_FL(R->Y);
  529. break; /* LDY $ssss,x ABS,x */
  530. case 0xBD:
  531. MR_Ax(R->A);
  532. M_FL(R->A);
  533. break; /* LDA $ssss,x ABS,x */
  534. case 0xBE:
  535. MR_Ay(R->X);
  536. M_FL(R->X);
  537. break; /* LDX $ssss,y ABS,y */
  538. case 0xD9:
  539. MR_Ay(I);
  540. M_CMP(R->A, I);
  541. break; /* CMP $ssss,y ABS,y */
  542. case 0xDD:
  543. MR_Ax(I);
  544. M_CMP(R->A, I);
  545. break; /* CMP $ssss,x ABS,x */
  546. case 0xDE:
  547. MM_Ax(M_DEC);
  548. break; /* DEC $ssss,x ABS,x */
  549. case 0xF9:
  550. MR_Ay(I);
  551. M_SBC(I);
  552. break; /* SBC $ssss,y ABS,y */
  553. case 0xFD:
  554. MR_Ax(I);
  555. M_SBC(I);
  556. break; /* SBC $ssss,x ABS,x */
  557. case 0xFE:
  558. MM_Ax(M_INC);
  559. break; /* INC $ssss,x ABS,x */
  560. case 0x01:
  561. MR_Ix(I);
  562. M_ORA(I);
  563. break; /* ORA ($ss,x) INDEXINDIR */
  564. case 0x11:
  565. MR_Iy(I);
  566. M_ORA(I);
  567. break; /* ORA ($ss),y INDIRINDEX */
  568. case 0x21:
  569. MR_Ix(I);
  570. M_AND(I);
  571. break; /* AND ($ss,x) INDEXINDIR */
  572. case 0x31:
  573. MR_Iy(I);
  574. M_AND(I);
  575. break; /* AND ($ss),y INDIRINDEX */
  576. case 0x41:
  577. MR_Ix(I);
  578. M_EOR(I);
  579. break; /* EOR ($ss,x) INDEXINDIR */
  580. case 0x51:
  581. MR_Iy(I);
  582. M_EOR(I);
  583. break; /* EOR ($ss),y INDIRINDEX */
  584. case 0x61:
  585. MR_Ix(I);
  586. M_ADC(I);
  587. break; /* ADC ($ss,x) INDEXINDIR */
  588. case 0x71:
  589. MR_Iy(I);
  590. M_ADC(I);
  591. break; /* ADC ($ss),y INDIRINDEX */
  592. case 0x81:
  593. MW_Ix(R->A);
  594. break; /* STA ($ss,x) INDEXINDIR */
  595. case 0x91:
  596. MW_Iy(R->A);
  597. break; /* STA ($ss),y INDIRINDEX */
  598. case 0xA1:
  599. MR_Ix(R->A);
  600. M_FL(R->A);
  601. break; /* LDA ($ss,x) INDEXINDIR */
  602. case 0xB1:
  603. MR_Iy(R->A);
  604. M_FL(R->A);
  605. break; /* LDA ($ss),y INDIRINDEX */
  606. case 0xC1:
  607. MR_Ix(I);
  608. M_CMP(R->A, I);
  609. break; /* CMP ($ss,x) INDEXINDIR */
  610. case 0xD1:
  611. MR_Iy(I);
  612. M_CMP(R->A, I);
  613. break; /* CMP ($ss),y INDIRINDEX */
  614. case 0xE1:
  615. MR_Ix(I);
  616. M_SBC(I);
  617. break; /* SBC ($ss,x) INDEXINDIR */
  618. case 0xF1:
  619. MR_Iy(I);
  620. M_SBC(I);
  621. break; /* SBC ($ss),y INDIRINDEX */
  622. case 0x0A:
  623. M_ASL(R->A);
  624. break; /* ASL a ACC */
  625. case 0x2A:
  626. M_ROL(R->A);
  627. break; /* ROL a ACC */
  628. case 0x4A:
  629. M_LSR(R->A);
  630. break; /* LSR a ACC */
  631. case 0x6A:
  632. M_ROR(R->A);
  633. break; /* ROR a ACC */