sek.c 15 KB

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  1. /*
  2. * PicoDrive
  3. * (c) Copyright Dave, 2004
  4. * (C) notaz, 2006-2009
  5. *
  6. * This work is licensed under the terms of MAME license.
  7. * See COPYING file in the top-level directory.
  8. */
  9. #include "pico_int.h"
  10. #include "memory.h"
  11. #ifdef USE_LIBRETRO_VFS
  12. #include "file_stream_transforms.h"
  13. #endif
  14. /* context */
  15. // Cyclone 68000
  16. #ifdef EMU_C68K
  17. struct Cyclone PicoCpuCM68k;
  18. #endif
  19. // MUSASHI 68000
  20. #ifdef EMU_M68K
  21. m68ki_cpu_core PicoCpuMM68k;
  22. #endif
  23. // FAME 68000
  24. #ifdef EMU_F68K
  25. M68K_CONTEXT PicoCpuFM68k;
  26. #endif
  27. static int do_ack(int level)
  28. {
  29. struct PicoVideo *pv = &Pico.video;
  30. elprintf(EL_INTS, "%cack: @ %06x [%u], p=%02x",
  31. level == 6 ? 'v' : 'h', SekPc, SekCyclesDone(), pv->pending_ints);
  32. // the VDP doesn't look at the 68k level
  33. if (pv->pending_ints & pv->reg[1] & 0x20) {
  34. pv->pending_ints &= ~0x20;
  35. pv->status &= ~SR_F;
  36. return (pv->reg[0] & pv->pending_ints & 0x10) >> 2;
  37. }
  38. else if (pv->pending_ints & pv->reg[0] & 0x10)
  39. pv->pending_ints &= ~0x10;
  40. return 0;
  41. }
  42. /* callbacks */
  43. #ifdef EMU_C68K
  44. // interrupt acknowledgment
  45. static int SekIntAck(int level)
  46. {
  47. PicoCpuCM68k.irq = do_ack(level);
  48. return CYCLONE_INT_ACK_AUTOVECTOR;
  49. }
  50. static void SekResetAck(void)
  51. {
  52. elprintf(EL_ANOMALY, "Reset encountered @ %06x", SekPc);
  53. }
  54. static int SekUnrecognizedOpcode()
  55. {
  56. unsigned int pc;
  57. pc = SekPc;
  58. elprintf(EL_ANOMALY, "Unrecognized Opcode @ %06x", pc);
  59. // see if we are still in a mapped region
  60. pc &= 0x00ffffff;
  61. if (map_flag_set(m68k_read16_map[pc >> M68K_MEM_SHIFT])) {
  62. elprintf(EL_STATUS|EL_ANOMALY, "m68k crash @%06x", pc);
  63. PicoCpuCM68k.cycles = 0;
  64. PicoCpuCM68k.state_flags |= 1;
  65. return 1;
  66. }
  67. // happened once - may happen again
  68. SekFinishIdleDet();
  69. #ifdef EMU_M68K // debugging cyclone
  70. {
  71. extern int have_illegal;
  72. have_illegal = 1;
  73. }
  74. #endif
  75. return 0;
  76. }
  77. #endif
  78. #ifdef EMU_M68K
  79. static int SekIntAckM68K(int level)
  80. {
  81. CPU_INT_LEVEL = do_ack(level) << 8;
  82. return M68K_INT_ACK_AUTOVECTOR;
  83. }
  84. static int SekTasCallback(void)
  85. {
  86. return 0; // no writeback
  87. }
  88. #endif
  89. #ifdef EMU_F68K
  90. static void SekIntAckF68K(unsigned level)
  91. {
  92. PicoCpuFM68k.interrupts[0] = do_ack(level);
  93. }
  94. #endif
  95. PICO_INTERNAL void SekInit(void)
  96. {
  97. #ifdef EMU_C68K
  98. CycloneInit();
  99. memset(&PicoCpuCM68k,0,sizeof(PicoCpuCM68k));
  100. PicoCpuCM68k.IrqCallback=SekIntAck;
  101. PicoCpuCM68k.ResetCallback=SekResetAck;
  102. PicoCpuCM68k.UnrecognizedCallback=SekUnrecognizedOpcode;
  103. PicoCpuCM68k.flags=4; // Z set
  104. #endif
  105. #ifdef EMU_M68K
  106. {
  107. void *oldcontext = m68ki_cpu_p;
  108. m68k_set_context(&PicoCpuMM68k);
  109. m68k_set_cpu_type(M68K_CPU_TYPE_68000);
  110. m68k_init();
  111. m68k_set_int_ack_callback(SekIntAckM68K);
  112. m68k_set_tas_instr_callback(SekTasCallback);
  113. //m68k_pulse_reset();
  114. m68k_set_context(oldcontext);
  115. }
  116. #endif
  117. #ifdef EMU_F68K
  118. memset(&PicoCpuFM68k, 0, sizeof(PicoCpuFM68k));
  119. fm68k_init();
  120. PicoCpuFM68k.iack_handler = SekIntAckF68K;
  121. PicoCpuFM68k.sr = 0x2704; // Z flag
  122. #endif
  123. }
  124. // Reset the 68000:
  125. PICO_INTERNAL int SekReset(void)
  126. {
  127. if (Pico.rom==NULL) return 1;
  128. #ifdef EMU_C68K
  129. CycloneReset(&PicoCpuCM68k);
  130. #endif
  131. #ifdef EMU_M68K
  132. m68k_set_context(&PicoCpuMM68k); // if we ever reset m68k, we always need it's context to be set
  133. m68ki_cpu.sp[0]=0;
  134. m68k_set_irq(0);
  135. m68k_pulse_reset();
  136. REG_USP = 0; // ?
  137. #endif
  138. #ifdef EMU_F68K
  139. fm68k_reset(&PicoCpuFM68k);
  140. #endif
  141. return 0;
  142. }
  143. void SekStepM68k(void)
  144. {
  145. Pico.t.m68c_aim = Pico.t.m68c_cnt + 1;
  146. #if defined(EMU_CORE_DEBUG)
  147. Pico.t.m68c_cnt += CM_compareRun(1, 0);
  148. #elif defined(EMU_C68K)
  149. PicoCpuCM68k.cycles=1;
  150. CycloneRun(&PicoCpuCM68k);
  151. Pico.t.m68c_cnt += 1 - PicoCpuCM68k.cycles;
  152. #elif defined(EMU_M68K)
  153. Pico.t.m68c_cnt += m68k_execute(1);
  154. #elif defined(EMU_F68K)
  155. Pico.t.m68c_cnt += fm68k_emulate(&PicoCpuFM68k, 1, 0);
  156. #endif
  157. }
  158. PICO_INTERNAL void SekSetRealTAS(int use_real)
  159. {
  160. #ifdef EMU_C68K
  161. CycloneSetRealTAS(use_real);
  162. #endif
  163. #ifdef EMU_F68K
  164. // TODO
  165. #endif
  166. }
  167. // Pack the cpu into a common format:
  168. // XXX: rename
  169. PICO_INTERNAL void SekPackCpu(unsigned char *cpu, int is_sub)
  170. {
  171. unsigned int pc=0;
  172. #if defined(EMU_C68K)
  173. struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
  174. memcpy(cpu,context->d,0x40);
  175. pc=context->pc-context->membase;
  176. *(unsigned int *)(cpu+0x44)=CycloneGetSr(context);
  177. *(unsigned int *)(cpu+0x48)=context->osp;
  178. cpu[0x4c] = context->irq;
  179. cpu[0x4d] = context->state_flags & 1;
  180. #elif defined(EMU_M68K)
  181. void *oldcontext = m68ki_cpu_p;
  182. m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
  183. memcpy(cpu,m68ki_cpu_p->dar,0x40);
  184. pc=m68ki_cpu_p->pc;
  185. *(unsigned int *)(cpu+0x44)=m68k_get_reg(NULL, M68K_REG_SR);
  186. *(unsigned int *)(cpu+0x48)=m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET];
  187. cpu[0x4c] = CPU_INT_LEVEL>>8;
  188. cpu[0x4d] = CPU_STOPPED;
  189. m68k_set_context(oldcontext);
  190. #elif defined(EMU_F68K)
  191. M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
  192. memcpy(cpu,context->dreg,0x40);
  193. pc=context->pc;
  194. *(unsigned int *)(cpu+0x44)=context->sr;
  195. *(unsigned int *)(cpu+0x48)=context->asp;
  196. cpu[0x4c] = context->interrupts[0];
  197. cpu[0x4d] = (context->execinfo & FM68K_HALTED) ? 1 : 0;
  198. #endif
  199. *(unsigned int *)(cpu+0x40) = pc;
  200. *(unsigned int *)(cpu+0x50) =
  201. is_sub ? SekCycleCntS68k : Pico.t.m68c_cnt;
  202. }
  203. PICO_INTERNAL void SekUnpackCpu(const unsigned char *cpu, int is_sub)
  204. {
  205. #if defined(EMU_C68K)
  206. struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
  207. CycloneSetSr(context, *(unsigned int *)(cpu+0x44));
  208. context->osp=*(unsigned int *)(cpu+0x48);
  209. memcpy(context->d,cpu,0x40);
  210. context->membase = 0;
  211. context->pc = *(unsigned int *)(cpu+0x40);
  212. CycloneUnpack(context, NULL); // rebase PC
  213. context->irq = cpu[0x4c];
  214. context->state_flags = 0;
  215. if (cpu[0x4d])
  216. context->state_flags |= 1;
  217. #elif defined(EMU_M68K)
  218. void *oldcontext = m68ki_cpu_p;
  219. m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
  220. m68k_set_reg(M68K_REG_SR, *(unsigned int *)(cpu+0x44));
  221. memcpy(m68ki_cpu_p->dar,cpu,0x40);
  222. m68ki_cpu_p->pc=*(unsigned int *)(cpu+0x40);
  223. m68ki_cpu_p->sp[m68ki_cpu_p->s_flag^SFLAG_SET]=*(unsigned int *)(cpu+0x48);
  224. CPU_INT_LEVEL = cpu[0x4c] << 8;
  225. CPU_STOPPED = cpu[0x4d];
  226. m68k_set_context(oldcontext);
  227. #elif defined(EMU_F68K)
  228. M68K_CONTEXT *context = is_sub ? &PicoCpuFS68k : &PicoCpuFM68k;
  229. memcpy(context->dreg,cpu,0x40);
  230. context->pc =*(unsigned int *)(cpu+0x40);
  231. context->sr =*(unsigned int *)(cpu+0x44);
  232. context->asp=*(unsigned int *)(cpu+0x48);
  233. context->interrupts[0] = cpu[0x4c];
  234. context->execinfo &= ~FM68K_HALTED;
  235. if (cpu[0x4d]&1) context->execinfo |= FM68K_HALTED;
  236. #endif
  237. if (is_sub)
  238. SekCycleCntS68k = *(unsigned int *)(cpu+0x50);
  239. else
  240. Pico.t.m68c_cnt = *(unsigned int *)(cpu+0x50);
  241. }
  242. /* idle loop detection, not to be used in CD mode */
  243. #ifdef EMU_C68K
  244. #include "cpu/cyclone/tools/idle.h"
  245. #endif
  246. static unsigned short **idledet_ptrs = NULL;
  247. static int idledet_count = 0, idledet_bads = 0;
  248. static int idledet_start_frame = 0;
  249. #if 0
  250. #define IDLE_STATS 1
  251. unsigned int idlehit_addrs[128], idlehit_counts[128];
  252. void SekRegisterIdleHit(unsigned int pc)
  253. {
  254. int i;
  255. for (i = 0; i < 127 && idlehit_addrs[i]; i++) {
  256. if (idlehit_addrs[i] == pc) {
  257. idlehit_counts[i]++;
  258. return;
  259. }
  260. }
  261. idlehit_addrs[i] = pc;
  262. idlehit_counts[i] = 1;
  263. idlehit_addrs[i+1] = 0;
  264. }
  265. #endif
  266. void SekInitIdleDet(void)
  267. {
  268. unsigned short **tmp;
  269. tmp = realloc(idledet_ptrs, 0x200 * sizeof(tmp[0]));
  270. if (tmp == NULL) {
  271. free(idledet_ptrs);
  272. idledet_ptrs = NULL;
  273. }
  274. else
  275. idledet_ptrs = tmp;
  276. idledet_count = idledet_bads = 0;
  277. idledet_start_frame = Pico.m.frame_count + 360;
  278. #ifdef IDLE_STATS
  279. idlehit_addrs[0] = 0;
  280. #endif
  281. #ifdef EMU_C68K
  282. CycloneInitIdle();
  283. #endif
  284. #ifdef EMU_F68K
  285. fm68k_idle_install();
  286. #endif
  287. }
  288. int SekIsIdleReady(void)
  289. {
  290. return (Pico.m.frame_count >= idledet_start_frame);
  291. }
  292. int SekIsIdleCode(unsigned short *dst, int bytes)
  293. {
  294. // printf("SekIsIdleCode %04x %i\n", *dst, bytes);
  295. switch (bytes)
  296. {
  297. case 2:
  298. if ((*dst & 0xf000) != 0x6000) // not another branch
  299. return 1;
  300. break;
  301. case 4:
  302. if ( (*dst & 0xff3f) == 0x4a38 || // tst.x ($xxxx.w); tas ($xxxx.w)
  303. (*dst & 0xc1ff) == 0x0038 || // move.x ($xxxx.w), dX
  304. (*dst & 0xf13f) == 0xb038) // cmp.x ($xxxx.w), dX
  305. return 1;
  306. if (PicoIn.AHW & (PAHW_MCD|PAHW_32X))
  307. break;
  308. // with no addons, there should be no need to wait
  309. // for byte change anywhere
  310. if ( (*dst & 0xfff8) == 0x4a10 || // tst.b ($aX)
  311. (*dst & 0xfff8) == 0x4a28) // tst.b ($xxxx,a0)
  312. return 1;
  313. break;
  314. case 6:
  315. if ( ((dst[1] & 0xe0) == 0xe0 && ( // RAM and
  316. *dst == 0x4a39 || // tst.b ($xxxxxxxx)
  317. *dst == 0x4a79 || // tst.w ($xxxxxxxx)
  318. *dst == 0x4ab9 || // tst.l ($xxxxxxxx)
  319. (*dst & 0xc1ff) == 0x0039 || // move.x ($xxxxxxxx), dX
  320. (*dst & 0xf13f) == 0xb039))||// cmp.x ($xxxxxxxx), dX
  321. *dst == 0x0838 || // btst $X, ($xxxx.w) [6 byte op]
  322. (*dst & 0xffbf) == 0x0c38) // cmpi.{b,w} $X, ($xxxx.w)
  323. return 1;
  324. break;
  325. case 8:
  326. if ( ((dst[2] & 0xe0) == 0xe0 && ( // RAM and
  327. *dst == 0x0839 || // btst $X, ($xxxxxxxx.w) [8 byte op]
  328. (*dst & 0xffbf) == 0x0c39))||// cmpi.{b,w} $X, ($xxxxxxxx)
  329. *dst == 0x0cb8) // cmpi.l $X, ($xxxx.w)
  330. return 1;
  331. break;
  332. case 12:
  333. if (PicoIn.AHW & (PAHW_MCD|PAHW_32X))
  334. break;
  335. if ( (*dst & 0xf1f8) == 0x3010 && // move.w (aX), dX
  336. (dst[1]&0xf100) == 0x0000 && // arithmetic
  337. (dst[3]&0xf100) == 0x0000) // arithmetic
  338. return 1;
  339. break;
  340. }
  341. return 0;
  342. }
  343. int SekRegisterIdlePatch(unsigned int pc, int oldop, int newop, void *ctx)
  344. {
  345. int is_main68k = 1;
  346. u16 *target;
  347. uptr v;
  348. #if defined(EMU_C68K)
  349. struct Cyclone *cyc = ctx;
  350. is_main68k = cyc == &PicoCpuCM68k;
  351. pc -= cyc->membase;
  352. #elif defined(EMU_F68K)
  353. is_main68k = ctx == &PicoCpuFM68k;
  354. #endif
  355. pc &= ~0xff000000;
  356. if (!(newop&0x200))
  357. elprintf(EL_IDLE, "idle: patch %06x %04x %04x %c %c #%i", pc, oldop, newop,
  358. (newop&0x200)?'n':'y', is_main68k?'m':'s', idledet_count);
  359. // XXX: probably shouldn't patch RAM too
  360. v = m68k_read16_map[pc >> M68K_MEM_SHIFT];
  361. if (!(v & 0x80000000))
  362. target = (u16 *)((v << 1) + pc);
  363. else {
  364. if (++idledet_bads > 128)
  365. return 2; // remove detector
  366. return 1; // don't patch
  367. }
  368. if (idledet_count >= 0x200 && (idledet_count & 0x1ff) == 0) {
  369. unsigned short **tmp;
  370. tmp = realloc(idledet_ptrs, (idledet_count+0x200) * sizeof(tmp[0]));
  371. if (tmp == NULL)
  372. return 1;
  373. idledet_ptrs = tmp;
  374. }
  375. idledet_ptrs[idledet_count++] = target;
  376. return 0;
  377. }
  378. void SekFinishIdleDet(void)
  379. {
  380. if (idledet_count < 0)
  381. return;
  382. #ifdef EMU_C68K
  383. CycloneFinishIdle();
  384. #endif
  385. #ifdef EMU_F68K
  386. fm68k_idle_remove();
  387. #endif
  388. while (idledet_count > 0)
  389. {
  390. unsigned short *op = idledet_ptrs[--idledet_count];
  391. if ((*op & 0xfd00) == 0x7100)
  392. *op &= 0xff, *op |= 0x6600;
  393. else if ((*op & 0xfd00) == 0x7500)
  394. *op &= 0xff, *op |= 0x6700;
  395. else if ((*op & 0xfd00) == 0x7d00)
  396. *op &= 0xff, *op |= 0x6000;
  397. else
  398. elprintf(EL_STATUS|EL_IDLE, "idle: don't know how to restore %04x", *op);
  399. }
  400. idledet_count = -1;
  401. }
  402. #if defined(CPU_CMP_R) || defined(CPU_CMP_W)
  403. #include "debug.h"
  404. struct ref_68k {
  405. u32 dar[16];
  406. u32 pc;
  407. u32 sr;
  408. u32 cycles;
  409. u32 pc_prev;
  410. };
  411. struct ref_68k ref_68ks[2];
  412. static int current_68k;
  413. void SekTrace(int is_s68k)
  414. {
  415. struct ref_68k *x68k = &ref_68ks[is_s68k];
  416. u32 pc = is_s68k ? SekPcS68k : SekPc;
  417. u32 sr = is_s68k ? SekSrS68k : SekSr;
  418. u32 cycles = is_s68k ? SekCycleCntS68k : Pico.t.m68c_cnt;
  419. u32 r;
  420. u8 cmd;
  421. #ifdef CPU_CMP_W
  422. int i;
  423. if (is_s68k != current_68k) {
  424. current_68k = is_s68k;
  425. cmd = CTL_68K_SLAVE | current_68k;
  426. tl_write(&cmd, sizeof(cmd));
  427. }
  428. if (pc != x68k->pc) {
  429. x68k->pc = pc;
  430. tl_write_uint(CTL_68K_PC, x68k->pc);
  431. }
  432. if (sr != x68k->sr) {
  433. x68k->sr = sr;
  434. tl_write_uint(CTL_68K_SR, x68k->sr);
  435. }
  436. for (i = 0; i < 16; i++) {
  437. r = is_s68k ? SekDarS68k(i) : SekDar(i);
  438. if (r != x68k->dar[i]) {
  439. x68k->dar[i] = r;
  440. tl_write_uint(CTL_68K_R + i, r);
  441. }
  442. }
  443. tl_write_uint(CTL_68K_CYCLES, cycles);
  444. #else
  445. int i, bad = 0;
  446. while (1)
  447. {
  448. int ret = tl_read(&cmd, sizeof(cmd));
  449. if (ret == 0) {
  450. elprintf(EL_STATUS, "EOF");
  451. exit(1);
  452. }
  453. switch (cmd) {
  454. case CTL_68K_SLAVE:
  455. case CTL_68K_SLAVE + 1:
  456. current_68k = cmd & 1;
  457. break;
  458. case CTL_68K_PC:
  459. tl_read_uint(&x68k->pc);
  460. break;
  461. case CTL_68K_SR:
  462. tl_read_uint(&x68k->sr);
  463. break;
  464. case CTL_68K_CYCLES:
  465. tl_read_uint(&x68k->cycles);
  466. goto breakloop;
  467. default:
  468. if (CTL_68K_R <= cmd && cmd < CTL_68K_R + 0x10)
  469. tl_read_uint(&x68k->dar[cmd - CTL_68K_R]);
  470. else
  471. elprintf(EL_STATUS, "invalid cmd: %02x", cmd);
  472. }
  473. }
  474. breakloop:
  475. if (is_s68k != current_68k) {
  476. printf("bad 68k: %d %d\n", is_s68k, current_68k);
  477. bad = 1;
  478. }
  479. if (cycles != x68k->cycles) {
  480. printf("bad cycles: %u %u\n", cycles, x68k->cycles);
  481. bad = 1;
  482. }
  483. if ((pc ^ x68k->pc) & 0xffffff) {
  484. printf("bad PC: %08x %08x\n", pc, x68k->pc);
  485. bad = 1;
  486. }
  487. if (sr != x68k->sr) {
  488. printf("bad SR: %03x %03x\n", sr, x68k->sr);
  489. bad = 1;
  490. }
  491. for (i = 0; i < 16; i++) {
  492. r = is_s68k ? SekDarS68k(i) : SekDar(i);
  493. if (r != x68k->dar[i]) {
  494. printf("bad %c%d: %08x %08x\n", i < 8 ? 'D' : 'A', i & 7,
  495. r, x68k->dar[i]);
  496. bad = 1;
  497. }
  498. }
  499. if (bad) {
  500. for (i = 0; i < 8; i++)
  501. printf("D%d: %08x A%d: %08x\n", i, x68k->dar[i],
  502. i, x68k->dar[i + 8]);
  503. printf("PC: %08x, %08x\n", x68k->pc, x68k->pc_prev);
  504. printf("SR: %04x\n", x68k->sr);
  505. PDebugDumpMem();
  506. exit(1);
  507. }
  508. x68k->pc_prev = x68k->pc;
  509. #endif
  510. }
  511. #endif // CPU_CMP_*
  512. #if defined(EMU_M68K) && M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
  513. static unsigned char op_flags[0x400000/2] = { 0, };
  514. static int atexit_set = 0;
  515. static void make_idc(void)
  516. {
  517. FILE *f = fopen("idc.idc", "w");
  518. int i;
  519. if (!f) return;
  520. fprintf(f, "#include <idc.idc>\nstatic main() {\n");
  521. for (i = 0; i < 0x400000/2; i++)
  522. if (op_flags[i] != 0)
  523. fprintf(f, " MakeCode(0x%06x);\n", i*2);
  524. fprintf(f, "}\n");
  525. fclose(f);
  526. }
  527. void instruction_hook(void)
  528. {
  529. if (!atexit_set) {
  530. atexit(make_idc);
  531. atexit_set = 1;
  532. }
  533. if (REG_PC < 0x400000)
  534. op_flags[REG_PC/2] = 1;
  535. }
  536. #endif
  537. // vim:shiftwidth=2:ts=2:expandtab