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1.1.1.3 root 1: /*
1.1 root 2: * UAE - The Un*x Amiga Emulator
1.1.1.3 root 3: *
1.1 root 4: * MC68000 emulation
5: *
6: * (c) 1995 Bernd Schmidt
7: */
8:
9: #include "sysconfig.h"
10: #include "sysdeps.h"
11:
12: #include "config.h"
13: #include "options.h"
14: #include "events.h"
1.1.1.3 root 15: #include "uae.h"
16: #include "machdep/m68k.h"
1.1 root 17: #include "memory.h"
18: #include "custom.h"
1.1.1.2 root 19: #include "readcpu.h"
1.1 root 20: #include "newcpu.h"
21: #include "autoconf.h"
22: #include "ersatz.h"
23: #include "debug.h"
24: #include "compiler.h"
1.1.1.3 root 25: #include "gui.h"
26:
27: /* Opcode of faulting instruction */
28: uae_u16 last_op_for_exception_3;
29: /* PC at fault time */
30: uaecptr last_addr_for_exception_3;
31: /* Address that generated the exception */
32: uaecptr last_fault_for_exception_3;
1.1 root 33:
34: int areg_byteinc[] = { 1,1,1,1,1,1,1,2 };
35: int imm8_table[] = { 8,1,2,3,4,5,6,7 };
36:
37: int movem_index1[256];
38: int movem_index2[256];
39: int movem_next[256];
40:
41: int fpp_movem_index1[256];
42: int fpp_movem_index2[256];
43: int fpp_movem_next[256];
44:
45: cpuop_func *cpufunctbl[65536];
46:
1.1.1.3 root 47: #define COUNT_INSTRS 0
1.1 root 48:
49: #if COUNT_INSTRS
50: static unsigned long int instrcount[65536];
1.1.1.3 root 51: static uae_u16 opcodenums[65536];
1.1 root 52:
1.1.1.4 ! root 53: static int compfn (const void *el1, const void *el2)
1.1 root 54: {
1.1.1.3 root 55: return instrcount[*(const uae_u16 *)el1] < instrcount[*(const uae_u16 *)el2];
56: }
57:
58: static char *icountfilename (void)
59: {
60: char *name = getenv ("INSNCOUNT");
61: if (name)
62: return name;
63: return COUNT_INSTRS == 2 ? "frequent.68k" : "insncount";
1.1 root 64: }
65:
1.1.1.4 ! root 66: void dump_counts (void)
1.1 root 67: {
1.1.1.4 ! root 68: FILE *f = fopen (icountfilename (), "w");
1.1.1.3 root 69: unsigned long int total;
1.1 root 70: int i;
1.1.1.3 root 71:
72: write_log ("Writing instruction count file...\n");
1.1.1.4 ! root 73: for (i = 0; i < 65536; i++) {
1.1 root 74: opcodenums[i] = i;
1.1.1.3 root 75: total += instrcount[i];
1.1 root 76: }
1.1.1.4 ! root 77: qsort (opcodenums, 65536, sizeof(uae_u16), compfn);
1.1.1.3 root 78:
79: fprintf (f, "Total: %lu\n", total);
80: for (i=0; i < 65536; i++) {
1.1 root 81: unsigned long int cnt = instrcount[opcodenums[i]];
82: struct instr *dp;
83: struct mnemolookup *lookup;
84: if (!cnt)
85: break;
86: dp = table68k + opcodenums[i];
1.1.1.4 ! root 87: for (lookup = lookuptab;lookup->mnemo != dp->mnemo; lookup++)
! 88: ;
1.1.1.3 root 89: fprintf (f, "%04x: %lu %s\n", opcodenums[i], cnt, lookup->name);
1.1 root 90: }
1.1.1.4 ! root 91: fclose (f);
1.1 root 92: }
93: #else
1.1.1.4 ! root 94: void dump_counts (void)
1.1 root 95: {
96: }
97: #endif
98:
99: int broken_in;
100:
1.1.1.4 ! root 101: static __inline__ unsigned int cft_map (unsigned int f)
! 102: {
! 103: #ifndef HAVE_GET_WORD_UNSWAPPED
! 104: return f;
! 105: #else
! 106: return ((f >> 8) & 255) | ((f & 255) << 8);
! 107: #endif
! 108: }
! 109:
! 110: static unsigned long op_illg_1 (uae_u32 opcode) REGPARAM;
! 111:
! 112: static unsigned long REGPARAM2 op_illg_1 (uae_u32 opcode)
! 113: {
! 114: op_illg (cft_map (opcode));
! 115: return 4;
! 116: }
! 117:
1.1.1.3 root 118: static void build_cpufunctbl (void)
119: {
120: int i;
121: unsigned long opcode;
122: struct cputbl *tbl = (currprefs.cpu_level == 3 ? op_smalltbl_0
123: : currprefs.cpu_level == 2 ? op_smalltbl_1
124: : currprefs.cpu_level == 1 ? op_smalltbl_2
125: : currprefs.cpu_compatible ? op_smalltbl_4
126: : op_smalltbl_3);
127:
1.1.1.4 ! root 128: write_log ("Building CPU function table (%d %d %d).\n",
! 129: currprefs.cpu_level, currprefs.cpu_compatible, currprefs.address_space_24);
1.1.1.3 root 130:
131: for (opcode = 0; opcode < 65536; opcode++)
1.1.1.4 ! root 132: cpufunctbl[cft_map (opcode)] = op_illg_1;
1.1.1.3 root 133: for (i = 0; tbl[i].handler != NULL; i++) {
134: if (! tbl[i].specific)
1.1.1.4 ! root 135: cpufunctbl[cft_map (tbl[i].opcode)] = tbl[i].handler;
1.1.1.3 root 136: }
137: for (opcode = 0; opcode < 65536; opcode++) {
138: cpuop_func *f;
139:
140: if (table68k[opcode].mnemo == i_ILLG || table68k[opcode].clev > currprefs.cpu_level)
141: continue;
142:
143: if (table68k[opcode].handler != -1) {
1.1.1.4 ! root 144: f = cpufunctbl[cft_map (table68k[opcode].handler)];
! 145: if (f == op_illg_1)
1.1.1.3 root 146: abort();
1.1.1.4 ! root 147: cpufunctbl[cft_map (opcode)] = f;
1.1.1.3 root 148: }
149: }
150: for (i = 0; tbl[i].handler != NULL; i++) {
151: if (tbl[i].specific)
1.1.1.4 ! root 152: cpufunctbl[cft_map (tbl[i].opcode)] = tbl[i].handler;
! 153: }
! 154: }
! 155:
! 156: unsigned long cycles_mask, cycles_val;
! 157:
! 158: static void update_68k_cycles (void)
! 159: {
! 160: cycles_mask = 0;
! 161: cycles_val = currprefs.m68k_speed;
! 162: if (currprefs.m68k_speed < 1) {
! 163: cycles_mask = 0xFFFFFFFF;
! 164: cycles_val = 0;
1.1.1.3 root 165: }
166: }
167:
168: void check_prefs_changed_cpu (void)
169: {
170: if (currprefs.cpu_level != changed_prefs.cpu_level
171: || currprefs.cpu_compatible != changed_prefs.cpu_compatible) {
172: currprefs.cpu_level = changed_prefs.cpu_level;
173: currprefs.cpu_compatible = changed_prefs.cpu_compatible;
174: build_cpufunctbl ();
175: }
1.1.1.4 ! root 176: if (currprefs.m68k_speed != changed_prefs.m68k_speed) {
! 177: currprefs.m68k_speed = changed_prefs.m68k_speed;
! 178: reset_frame_rate_hack ();
! 179: update_68k_cycles ();
! 180: }
1.1.1.3 root 181: }
182:
1.1 root 183: void init_m68k (void)
184: {
1.1.1.3 root 185: int i;
186:
1.1.1.4 ! root 187: update_68k_cycles ();
! 188:
1.1 root 189: for (i = 0 ; i < 256 ; i++) {
1.1.1.3 root 190: int j;
1.1 root 191: for (j = 0 ; j < 8 ; j++) {
192: if (i & (1 << j)) break;
193: }
194: movem_index1[i] = j;
195: movem_index2[i] = 7-j;
196: movem_next[i] = i & (~(1 << j));
197: }
198: for (i = 0 ; i < 256 ; i++) {
1.1.1.3 root 199: int j;
1.1 root 200: for (j = 7 ; j >= 0 ; j--) {
201: if (i & (1 << j)) break;
202: }
203: fpp_movem_index1[i] = j;
204: fpp_movem_index2[i] = 7-j;
205: fpp_movem_next[i] = i & (~(1 << j));
206: }
207: #if COUNT_INSTRS
208: {
1.1.1.4 ! root 209: FILE *f = fopen (icountfilename (), "r");
! 210: memset (instrcount, 0, sizeof instrcount);
1.1 root 211: if (f) {
1.1.1.3 root 212: uae_u32 opcode, count, total;
1.1 root 213: char name[20];
1.1.1.3 root 214: write_log ("Reading instruction count file...\n");
1.1.1.4 ! root 215: fscanf (f, "Total: %lu\n", &total);
! 216: while (fscanf (f, "%lx: %lu %s\n", &opcode, &count, name) == 3) {
1.1 root 217: instrcount[opcode] = count;
218: }
219: fclose(f);
220: }
221: }
222: #endif
1.1.1.4 ! root 223: write_log ("Building CPU table... ");
1.1 root 224: read_table68k ();
225: do_merges ();
1.1.1.2 root 226:
1.1.1.4 ! root 227: write_log ("%d CPU functions\n", nr_cpuop_funcs);
1.1 root 228:
1.1.1.3 root 229: build_cpufunctbl ();
230: }
1.1.1.4 ! root 231:
1.1 root 232: struct regstruct regs, lastint_regs;
233: static struct regstruct regs_backup[16];
234: static int backup_pointer = 0;
1.1.1.3 root 235: static long int m68kpc_offset;
1.1 root 236: int lastint_no;
237:
1.1.1.3 root 238: #define get_ibyte_1(o) get_byte(regs.pc + (regs.pc_p - regs.pc_oldp) + (o) + 1)
239: #define get_iword_1(o) get_word(regs.pc + (regs.pc_p - regs.pc_oldp) + (o))
240: #define get_ilong_1(o) get_long(regs.pc + (regs.pc_p - regs.pc_oldp) + (o))
241:
1.1.1.4 ! root 242: uae_s32 ShowEA (int reg, amodes mode, wordsizes size, char *buf)
1.1.1.3 root 243: {
244: uae_u16 dp;
245: uae_s8 disp8;
246: uae_s16 disp16;
1.1 root 247: int r;
1.1.1.3 root 248: uae_u32 dispreg;
249: uaecptr addr;
250: uae_s32 offset = 0;
1.1.1.2 root 251: char buffer[80];
1.1.1.3 root 252:
253: switch (mode){
1.1 root 254: case Dreg:
1.1.1.3 root 255: sprintf (buffer,"D%d", reg);
1.1 root 256: break;
257: case Areg:
1.1.1.3 root 258: sprintf (buffer,"A%d", reg);
1.1 root 259: break;
260: case Aind:
1.1.1.3 root 261: sprintf (buffer,"(A%d)", reg);
1.1 root 262: break;
263: case Aipi:
1.1.1.3 root 264: sprintf (buffer,"(A%d)+", reg);
1.1 root 265: break;
266: case Apdi:
1.1.1.3 root 267: sprintf (buffer,"-(A%d)", reg);
1.1 root 268: break;
269: case Ad16:
1.1.1.4 ! root 270: disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1.1.3 root 271: addr = m68k_areg(regs,reg) + (uae_s16)disp16;
272: sprintf (buffer,"(A%d,$%04x) == $%08lx", reg, disp16 & 0xffff,
1.1 root 273: (long unsigned int)addr);
274: break;
275: case Ad8r:
1.1.1.4 ! root 276: dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1 root 277: disp8 = dp & 0xFF;
278: r = (dp & 0x7000) >> 12;
1.1.1.3 root 279: dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
280: if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
1.1 root 281: dispreg <<= (dp >> 9) & 3;
1.1.1.3 root 282:
1.1 root 283: if (dp & 0x100) {
1.1.1.3 root 284: uae_s32 outer = 0, disp = 0;
285: uae_s32 base = m68k_areg(regs,reg);
286: char name[10];
287: sprintf (name,"A%d, ",reg);
288: if (dp & 0x80) { base = 0; name[0] = 0; }
289: if (dp & 0x40) dispreg = 0;
1.1.1.4 ! root 290: if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 291: if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 292: base += disp;
293:
1.1.1.4 ! root 294: if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 295: if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 296:
297: if (!(dp & 4)) base += dispreg;
298: if (dp & 3) base = get_long (base);
299: if (dp & 4) base += dispreg;
300:
301: addr = base + outer;
302: sprintf (buffer,"(%s%c%d.%c*%d+%ld)+%ld == $%08lx", name,
303: dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
304: 1 << ((dp >> 9) & 3),
305: disp,outer,
306: (long unsigned int)addr);
307: } else {
308: addr = m68k_areg(regs,reg) + (uae_s32)((uae_s8)disp8) + dispreg;
309: sprintf (buffer,"(A%d, %c%d.%c*%d, $%02x) == $%08lx", reg,
1.1 root 310: dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
311: 1 << ((dp >> 9) & 3), disp8,
312: (long unsigned int)addr);
313: }
314: break;
315: case PC16:
1.1.1.4 ! root 316: addr = m68k_getpc () + m68kpc_offset;
! 317: disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1.1.3 root 318: addr += (uae_s16)disp16;
319: sprintf (buffer,"(PC,$%04x) == $%08lx", disp16 & 0xffff,(long unsigned int)addr);
1.1 root 320: break;
321: case PC8r:
1.1.1.4 ! root 322: addr = m68k_getpc () + m68kpc_offset;
! 323: dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1 root 324: disp8 = dp & 0xFF;
325: r = (dp & 0x7000) >> 12;
1.1.1.2 root 326: dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
1.1.1.3 root 327: if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
1.1 root 328: dispreg <<= (dp >> 9) & 3;
1.1.1.3 root 329:
1.1 root 330: if (dp & 0x100) {
1.1.1.3 root 331: uae_s32 outer = 0,disp = 0;
332: uae_s32 base = addr;
333: char name[10];
334: sprintf (name,"PC, ");
335: if (dp & 0x80) { base = 0; name[0] = 0; }
336: if (dp & 0x40) dispreg = 0;
1.1.1.4 ! root 337: if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 338: if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 339: base += disp;
340:
1.1.1.4 ! root 341: if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 342: if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 343:
344: if (!(dp & 4)) base += dispreg;
345: if (dp & 3) base = get_long (base);
346: if (dp & 4) base += dispreg;
347:
348: addr = base + outer;
349: sprintf (buffer,"(%s%c%d.%c*%d+%ld)+%ld == $%08lx", name,
350: dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
351: 1 << ((dp >> 9) & 3),
352: disp,outer,
353: (long unsigned int)addr);
1.1.1.2 root 354: } else {
1.1.1.3 root 355: addr += (uae_s32)((uae_s8)disp8) + dispreg;
356: sprintf (buffer,"(PC, %c%d.%c*%d, $%02x) == $%08lx", dp & 0x8000 ? 'A' : 'D',
1.1 root 357: (int)r, dp & 0x800 ? 'L' : 'W', 1 << ((dp >> 9) & 3),
358: disp8, (long unsigned int)addr);
359: }
360: break;
361: case absw:
1.1.1.4 ! root 362: sprintf (buffer,"$%08lx", (long unsigned int)(uae_s32)(uae_s16)get_iword_1 (m68kpc_offset));
1.1.1.3 root 363: m68kpc_offset += 2;
1.1 root 364: break;
365: case absl:
1.1.1.4 ! root 366: sprintf (buffer,"$%08lx", (long unsigned int)get_ilong_1 (m68kpc_offset));
1.1.1.3 root 367: m68kpc_offset += 4;
1.1 root 368: break;
369: case imm:
1.1.1.3 root 370: switch (size){
1.1 root 371: case sz_byte:
1.1.1.4 ! root 372: sprintf (buffer,"#$%02x", (unsigned int)(get_iword_1 (m68kpc_offset) & 0xff));
1.1.1.3 root 373: m68kpc_offset += 2;
374: break;
1.1 root 375: case sz_word:
1.1.1.4 ! root 376: sprintf (buffer,"#$%04x", (unsigned int)(get_iword_1 (m68kpc_offset) & 0xffff));
1.1.1.3 root 377: m68kpc_offset += 2;
378: break;
1.1 root 379: case sz_long:
1.1.1.4 ! root 380: sprintf (buffer,"#$%08lx", (long unsigned int)(get_ilong_1 (m68kpc_offset)));
1.1.1.3 root 381: m68kpc_offset += 4;
382: break;
1.1 root 383: default:
384: break;
385: }
386: break;
387: case imm0:
1.1.1.4 ! root 388: offset = (uae_s32)(uae_s8)get_iword_1 (m68kpc_offset);
1.1.1.3 root 389: m68kpc_offset += 2;
390: sprintf (buffer,"#$%02x", (unsigned int)(offset & 0xff));
1.1 root 391: break;
392: case imm1:
1.1.1.4 ! root 393: offset = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
1.1.1.3 root 394: m68kpc_offset += 2;
395: sprintf (buffer,"#$%04x", (unsigned int)(offset & 0xffff));
1.1 root 396: break;
397: case imm2:
1.1.1.4 ! root 398: offset = (uae_s32)get_ilong_1 (m68kpc_offset);
1.1.1.3 root 399: m68kpc_offset += 4;
400: sprintf (buffer,"#$%08lx", (long unsigned int)offset);
1.1 root 401: break;
402: case immi:
1.1.1.3 root 403: offset = (uae_s32)(uae_s8)(reg & 0xff);
404: sprintf (buffer,"#$%08lx", (long unsigned int)offset);
1.1 root 405: break;
406: default:
407: break;
408: }
1.1.1.2 root 409: if (buf == 0)
1.1.1.3 root 410: printf ("%s", buffer);
1.1.1.2 root 411: else
1.1.1.4 ! root 412: strcat (buf, buffer);
1.1.1.2 root 413: return offset;
1.1 root 414: }
415:
1.1.1.3 root 416: /* The plan is that this will take over the job of exception 3 handling -
417: * the CPU emulation functions will just do a longjmp to m68k_go whenever
418: * they hit an odd address. */
1.1.1.4 ! root 419: static int verify_ea (int reg, amodes mode, wordsizes size, uae_u32 *val)
1.1.1.3 root 420: {
421: uae_u16 dp;
422: uae_s8 disp8;
423: uae_s16 disp16;
424: int r;
425: uae_u32 dispreg;
426: uaecptr addr;
427: uae_s32 offset = 0;
428:
429: switch (mode){
430: case Dreg:
431: *val = m68k_dreg (regs, reg);
432: return 1;
433: case Areg:
434: *val = m68k_areg (regs, reg);
435: return 1;
436:
437: case Aind:
438: case Aipi:
439: addr = m68k_areg (regs, reg);
440: break;
441: case Apdi:
442: addr = m68k_areg (regs, reg);
443: break;
444: case Ad16:
1.1.1.4 ! root 445: disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1.1.3 root 446: addr = m68k_areg(regs,reg) + (uae_s16)disp16;
447: break;
448: case Ad8r:
449: addr = m68k_areg (regs, reg);
450: d8r_common:
1.1.1.4 ! root 451: dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1.1.3 root 452: disp8 = dp & 0xFF;
453: r = (dp & 0x7000) >> 12;
454: dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
455: if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
456: dispreg <<= (dp >> 9) & 3;
457:
458: if (dp & 0x100) {
459: uae_s32 outer = 0, disp = 0;
460: uae_s32 base = addr;
461: if (dp & 0x80) base = 0;
462: if (dp & 0x40) dispreg = 0;
1.1.1.4 ! root 463: if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 464: if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 465: base += disp;
466:
1.1.1.4 ! root 467: if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
! 468: if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
1.1.1.3 root 469:
470: if (!(dp & 4)) base += dispreg;
471: if (dp & 3) base = get_long (base);
472: if (dp & 4) base += dispreg;
473:
474: addr = base + outer;
475: } else {
476: addr += (uae_s32)((uae_s8)disp8) + dispreg;
477: }
478: break;
479: case PC16:
1.1.1.4 ! root 480: addr = m68k_getpc () + m68kpc_offset;
! 481: disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
1.1.1.3 root 482: addr += (uae_s16)disp16;
483: break;
484: case PC8r:
1.1.1.4 ! root 485: addr = m68k_getpc () + m68kpc_offset;
1.1.1.3 root 486: goto d8r_common;
487: case absw:
1.1.1.4 ! root 488: addr = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
1.1.1.3 root 489: m68kpc_offset += 2;
490: break;
491: case absl:
1.1.1.4 ! root 492: addr = get_ilong_1 (m68kpc_offset);
1.1.1.3 root 493: m68kpc_offset += 4;
494: break;
495: case imm:
496: switch (size){
497: case sz_byte:
1.1.1.4 ! root 498: *val = get_iword_1 (m68kpc_offset) & 0xff;
1.1.1.3 root 499: m68kpc_offset += 2;
500: break;
501: case sz_word:
1.1.1.4 ! root 502: *val = get_iword_1 (m68kpc_offset) & 0xffff;
1.1.1.3 root 503: m68kpc_offset += 2;
504: break;
505: case sz_long:
1.1.1.4 ! root 506: *val = get_ilong_1 (m68kpc_offset);
1.1.1.3 root 507: m68kpc_offset += 4;
508: break;
509: default:
510: break;
511: }
512: return 1;
513: case imm0:
514: *val = (uae_s32)(uae_s8)get_iword_1 (m68kpc_offset);
515: m68kpc_offset += 2;
516: return 1;
517: case imm1:
518: *val = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
519: m68kpc_offset += 2;
520: return 1;
521: case imm2:
522: *val = get_ilong_1 (m68kpc_offset);
523: m68kpc_offset += 4;
524: return 1;
525: case immi:
526: *val = (uae_s32)(uae_s8)(reg & 0xff);
527: return 1;
528: default:
529: addr = 0;
530: break;
531: }
532: if ((addr & 1) == 0)
533: return 1;
534:
1.1.1.4 ! root 535: last_addr_for_exception_3 = m68k_getpc () + m68kpc_offset;
1.1.1.3 root 536: last_fault_for_exception_3 = addr;
537: return 0;
538: }
539:
1.1.1.4 ! root 540: void MakeSR (void)
1.1 root 541: {
542: #if 0
543: assert((regs.t1 & 1) == regs.t1);
544: assert((regs.t0 & 1) == regs.t0);
545: assert((regs.s & 1) == regs.s);
546: assert((regs.m & 1) == regs.m);
547: assert((XFLG & 1) == XFLG);
548: assert((NFLG & 1) == NFLG);
549: assert((ZFLG & 1) == ZFLG);
550: assert((VFLG & 1) == VFLG);
551: assert((CFLG & 1) == CFLG);
552: #endif
553: regs.sr = ((regs.t1 << 15) | (regs.t0 << 14)
554: | (regs.s << 13) | (regs.m << 12) | (regs.intmask << 8)
1.1.1.3 root 555: | (XFLG << 4) | (NFLG << 3) | (ZFLG << 2) | (VFLG << 1)
1.1.1.4 ! root 556: | CFLG);
1.1 root 557: }
558:
1.1.1.4 ! root 559: void MakeFromSR (void)
1.1 root 560: {
561: int oldm = regs.m;
562: int olds = regs.s;
563:
564: regs.t1 = (regs.sr >> 15) & 1;
565: regs.t0 = (regs.sr >> 14) & 1;
566: regs.s = (regs.sr >> 13) & 1;
567: regs.m = (regs.sr >> 12) & 1;
568: regs.intmask = (regs.sr >> 8) & 7;
569: XFLG = (regs.sr >> 4) & 1;
570: NFLG = (regs.sr >> 3) & 1;
571: ZFLG = (regs.sr >> 2) & 1;
572: VFLG = (regs.sr >> 1) & 1;
573: CFLG = regs.sr & 1;
1.1.1.3 root 574: if (currprefs.cpu_level >= 2) {
1.1 root 575: if (olds != regs.s) {
1.1.1.3 root 576: if (olds) {
577: if (oldm)
578: regs.msp = m68k_areg(regs, 7);
579: else
580: regs.isp = m68k_areg(regs, 7);
581: m68k_areg(regs, 7) = regs.usp;
582: } else {
583: regs.usp = m68k_areg(regs, 7);
584: m68k_areg(regs, 7) = regs.m ? regs.msp : regs.isp;
585: }
1.1 root 586: } else if (olds && oldm != regs.m) {
587: if (oldm) {
1.1.1.2 root 588: regs.msp = m68k_areg(regs, 7);
589: m68k_areg(regs, 7) = regs.isp;
590: } else {
591: regs.isp = m68k_areg(regs, 7);
592: m68k_areg(regs, 7) = regs.msp;
1.1 root 593: }
594: }
595: } else {
596: if (olds != regs.s) {
1.1.1.3 root 597: if (olds) {
598: regs.isp = m68k_areg(regs, 7);
599: m68k_areg(regs, 7) = regs.usp;
600: } else {
601: regs.usp = m68k_areg(regs, 7);
602: m68k_areg(regs, 7) = regs.isp;
603: }
604: }
1.1 root 605: }
1.1.1.3 root 606:
1.1 root 607: regs.spcflags |= SPCFLAG_INT;
608: if (regs.t1 || regs.t0)
1.1.1.3 root 609: regs.spcflags |= SPCFLAG_TRACE;
1.1 root 610: else
1.1.1.3 root 611: regs.spcflags &= ~(SPCFLAG_TRACE | SPCFLAG_DOTRACE);
1.1 root 612: }
613:
1.1.1.3 root 614: void Exception(int nr, uaecptr oldpc)
1.1 root 615: {
1.1.1.2 root 616: compiler_flush_jsr_stack();
1.1 root 617: MakeSR();
618: if (!regs.s) {
1.1.1.2 root 619: regs.usp = m68k_areg(regs, 7);
1.1.1.3 root 620: if (currprefs.cpu_level >= 2)
621: m68k_areg(regs, 7) = regs.m ? regs.msp : regs.isp;
622: else
623: m68k_areg(regs, 7) = regs.isp;
1.1 root 624: regs.s = 1;
625: }
1.1.1.3 root 626: if (currprefs.cpu_level > 0) {
1.1 root 627: if (nr == 2 || nr == 3) {
628: int i;
1.1.1.3 root 629: /* @@@ this is probably wrong (?) */
1.1 root 630: for (i = 0 ; i < 12 ; i++) {
1.1.1.2 root 631: m68k_areg(regs, 7) -= 2;
632: put_word (m68k_areg(regs, 7), 0);
1.1 root 633: }
1.1.1.2 root 634: m68k_areg(regs, 7) -= 2;
635: put_word (m68k_areg(regs, 7), 0xa000 + nr * 4);
1.1 root 636: } else if (nr ==5 || nr == 6 || nr == 7 || nr == 9) {
1.1.1.3 root 637: m68k_areg(regs, 7) -= 4;
638: put_long (m68k_areg(regs, 7), oldpc);
639: m68k_areg(regs, 7) -= 2;
640: put_word (m68k_areg(regs, 7), 0x2000 + nr * 4);
641: } else if (regs.m && nr >= 24 && nr < 32) {
642: m68k_areg(regs, 7) -= 2;
643: put_word (m68k_areg(regs, 7), nr * 4);
644: m68k_areg(regs, 7) -= 4;
645: put_long (m68k_areg(regs, 7), m68k_getpc ());
646: m68k_areg(regs, 7) -= 2;
647: put_word (m68k_areg(regs, 7), regs.sr);
648: regs.sr |= (1 << 13);
649: regs.msp = m68k_areg(regs, 7);
650: m68k_areg(regs, 7) = regs.isp;
651: m68k_areg(regs, 7) -= 2;
652: put_word (m68k_areg(regs, 7), 0x1000 + nr * 4);
653: } else {
654: m68k_areg(regs, 7) -= 2;
655: put_word (m68k_areg(regs, 7), nr * 4);
656: }
657: } else {
658: if (nr == 2 || nr == 3) {
659: m68k_areg(regs, 7) -= 12;
660: /* ??????? */
661: if (nr == 3) {
662: put_long (m68k_areg(regs, 7), last_fault_for_exception_3);
663: put_word (m68k_areg(regs, 7)+4, last_op_for_exception_3);
664: put_long (m68k_areg(regs, 7)+8, last_addr_for_exception_3);
665: }
666: write_log ("Exception!\n");
667: goto kludge_me_do;
668: }
1.1 root 669: }
1.1.1.2 root 670: m68k_areg(regs, 7) -= 4;
671: put_long (m68k_areg(regs, 7), m68k_getpc ());
1.1.1.3 root 672: kludge_me_do:
1.1.1.2 root 673: m68k_areg(regs, 7) -= 2;
674: put_word (m68k_areg(regs, 7), regs.sr);
1.1.1.3 root 675: m68k_setpc (get_long (regs.vbr + 4*nr));
676: fill_prefetch_0 ();
1.1 root 677: regs.t1 = regs.t0 = regs.m = 0;
678: regs.spcflags &= ~(SPCFLAG_TRACE | SPCFLAG_DOTRACE);
679: }
680:
681: static void Interrupt(int nr)
682: {
683: assert(nr < 8 && nr >= 0);
684: lastint_regs = regs;
685: lastint_no = nr;
686: Exception(nr+24, 0);
1.1.1.3 root 687:
1.1 root 688: regs.intmask = nr;
689: regs.spcflags |= SPCFLAG_INT;
690: }
691:
692: static int caar, cacr;
693:
1.1.1.3 root 694: void m68k_move2c (int regno, uae_u32 *regp)
1.1 root 695: {
1.1.1.3 root 696: if (currprefs.cpu_level == 1 && (regno & 0x7FF) > 1)
1.1 root 697: op_illg (0x4E7B);
698: else
699: switch (regno) {
700: case 0: regs.sfc = *regp & 7; break;
701: case 1: regs.dfc = *regp & 7; break;
702: case 2: cacr = *regp & 0x3; break; /* ignore C and CE */
703: case 0x800: regs.usp = *regp; break;
704: case 0x801: regs.vbr = *regp; break;
705: case 0x802: caar = *regp &0xfc; break;
1.1.1.2 root 706: case 0x803: regs.msp = *regp; if (regs.m == 1) m68k_areg(regs, 7) = regs.msp; break;
707: case 0x804: regs.isp = *regp; if (regs.m == 0) m68k_areg(regs, 7) = regs.isp; break;
1.1 root 708: default:
709: op_illg (0x4E7B);
710: break;
711: }
712: }
713:
1.1.1.3 root 714: void m68k_movec2 (int regno, uae_u32 *regp)
1.1 root 715: {
1.1.1.3 root 716: if (currprefs.cpu_level == 1 && (regno & 0x7FF) > 1)
1.1 root 717: op_illg (0x4E7A);
718: else
719: switch (regno) {
720: case 0: *regp = regs.sfc; break;
721: case 1: *regp = regs.dfc; break;
722: case 2: *regp = cacr; break;
723: case 0x800: *regp = regs.usp; break;
724: case 0x801: *regp = regs.vbr; break;
725: case 0x802: *regp = caar; break;
1.1.1.2 root 726: case 0x803: *regp = regs.m == 1 ? m68k_areg(regs, 7) : regs.msp; break;
727: case 0x804: *regp = regs.m == 0 ? m68k_areg(regs, 7) : regs.isp; break;
1.1 root 728: default:
729: op_illg (0x4E7A);
730: break;
731: }
732: }
733:
734: static __inline__ int
1.1.1.3 root 735: div_unsigned(uae_u32 src_hi, uae_u32 src_lo, uae_u32 div, uae_u32 *quot, uae_u32 *rem)
1.1 root 736: {
1.1.1.3 root 737: uae_u32 q = 0, cbit = 0;
1.1 root 738: int i;
739:
740: if (div <= src_hi) {
1.1.1.4 ! root 741: return 1;
1.1 root 742: }
743: for (i = 0 ; i < 32 ; i++) {
1.1.1.2 root 744: cbit = src_hi & 0x80000000ul;
1.1 root 745: src_hi <<= 1;
1.1.1.2 root 746: if (src_lo & 0x80000000ul) src_hi++;
1.1 root 747: src_lo <<= 1;
748: q = q << 1;
749: if (cbit || div <= src_hi) {
750: q |= 1;
751: src_hi -= div;
752: }
753: }
754: *quot = q;
755: *rem = src_hi;
1.1.1.4 ! root 756: return 0;
1.1 root 757: }
758:
1.1.1.3 root 759: void m68k_divl (uae_u32 opcode, uae_u32 src, uae_u16 extra, uaecptr oldpc)
1.1 root 760: {
1.1.1.3 root 761: #if defined(uae_s64)
1.1 root 762: if (src == 0) {
1.1.1.4 ! root 763: Exception (5, oldpc);
1.1 root 764: return;
765: }
766: if (extra & 0x800) {
767: /* signed variant */
1.1.1.3 root 768: uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
769: uae_s64 quot, rem;
770:
1.1 root 771: if (extra & 0x400) {
1.1.1.3 root 772: a &= 0xffffffffu;
773: a |= (uae_s64)m68k_dreg(regs, extra & 7) << 32;
1.1 root 774: }
1.1.1.3 root 775: rem = a % (uae_s64)(uae_s32)src;
776: quot = a / (uae_s64)(uae_s32)src;
777: if ((quot & UVAL64(0xffffffff80000000)) != 0
778: && (quot & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
779: {
1.1 root 780: VFLG = NFLG = 1;
781: CFLG = 0;
1.1.1.4 ! root 782: } else {
1.1.1.3 root 783: if (((uae_s32)rem < 0) != ((uae_s64)a < 0)) rem = -rem;
1.1 root 784: VFLG = CFLG = 0;
1.1.1.3 root 785: ZFLG = ((uae_s32)quot) == 0;
786: NFLG = ((uae_s32)quot) < 0;
1.1.1.2 root 787: m68k_dreg(regs, extra & 7) = rem;
788: m68k_dreg(regs, (extra >> 12) & 7) = quot;
1.1 root 789: }
790: } else {
791: /* unsigned */
1.1.1.3 root 792: uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
793: uae_u64 quot, rem;
794:
1.1 root 795: if (extra & 0x400) {
1.1.1.3 root 796: a &= 0xffffffffu;
797: a |= (uae_u64)m68k_dreg(regs, extra & 7) << 32;
1.1 root 798: }
1.1.1.3 root 799: rem = a % (uae_u64)src;
800: quot = a / (uae_u64)src;
801: if (quot > 0xffffffffu) {
1.1 root 802: VFLG = NFLG = 1;
803: CFLG = 0;
1.1.1.4 ! root 804: } else {
1.1 root 805: VFLG = CFLG = 0;
1.1.1.3 root 806: ZFLG = ((uae_s32)quot) == 0;
807: NFLG = ((uae_s32)quot) < 0;
1.1.1.2 root 808: m68k_dreg(regs, extra & 7) = rem;
809: m68k_dreg(regs, (extra >> 12) & 7) = quot;
1.1 root 810: }
811: }
812: #else
813: if (src == 0) {
1.1.1.4 ! root 814: Exception (5, oldpc);
1.1 root 815: return;
816: }
817: if (extra & 0x800) {
818: /* signed variant */
1.1.1.3 root 819: uae_s32 lo = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
820: uae_s32 hi = lo < 0 ? -1 : 0;
821: uae_s32 save_high;
822: uae_u32 quot, rem;
823: uae_u32 sign;
824:
1.1 root 825: if (extra & 0x400) {
1.1.1.3 root 826: hi = (uae_s32)m68k_dreg(regs, extra & 7);
1.1 root 827: }
828: save_high = hi;
829: sign = (hi ^ src);
830: if (hi < 0) {
1.1.1.4 ! root 831: hi = ~hi;
! 832: lo = -lo;
! 833: if (lo == 0) hi++;
1.1 root 834: }
1.1.1.3 root 835: if ((uae_s32)src < 0) src = -src;
1.1 root 836: if (div_unsigned(hi, lo, src, ", &rem) ||
837: (sign & 0x80000000) ? quot > 0x80000000 : quot > 0x7fffffff) {
838: VFLG = NFLG = 1;
839: CFLG = 0;
1.1.1.4 ! root 840: } else {
1.1 root 841: if (sign & 0x80000000) quot = -quot;
1.1.1.3 root 842: if (((uae_s32)rem < 0) != (save_high < 0)) rem = -rem;
1.1 root 843: VFLG = CFLG = 0;
1.1.1.3 root 844: ZFLG = ((uae_s32)quot) == 0;
845: NFLG = ((uae_s32)quot) < 0;
1.1.1.2 root 846: m68k_dreg(regs, extra & 7) = rem;
847: m68k_dreg(regs, (extra >> 12) & 7) = quot;
1.1 root 848: }
849: } else {
850: /* unsigned */
1.1.1.3 root 851: uae_u32 lo = (uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
852: uae_u32 hi = 0;
853: uae_u32 quot, rem;
854:
1.1 root 855: if (extra & 0x400) {
1.1.1.3 root 856: hi = (uae_u32)m68k_dreg(regs, extra & 7);
1.1 root 857: }
858: if (div_unsigned(hi, lo, src, ", &rem)) {
859: VFLG = NFLG = 1;
860: CFLG = 0;
1.1.1.4 ! root 861: } else {
1.1 root 862: VFLG = CFLG = 0;
1.1.1.3 root 863: ZFLG = ((uae_s32)quot) == 0;
864: NFLG = ((uae_s32)quot) < 0;
1.1.1.2 root 865: m68k_dreg(regs, extra & 7) = rem;
866: m68k_dreg(regs, (extra >> 12) & 7) = quot;
1.1 root 867: }
868: }
869: #endif
870: }
871:
872: static __inline__ void
1.1.1.3 root 873: mul_unsigned(uae_u32 src1, uae_u32 src2, uae_u32 *dst_hi, uae_u32 *dst_lo)
1.1 root 874: {
1.1.1.3 root 875: uae_u32 r0 = (src1 & 0xffff) * (src2 & 0xffff);
876: uae_u32 r1 = ((src1 >> 16) & 0xffff) * (src2 & 0xffff);
877: uae_u32 r2 = (src1 & 0xffff) * ((src2 >> 16) & 0xffff);
878: uae_u32 r3 = ((src1 >> 16) & 0xffff) * ((src2 >> 16) & 0xffff);
879: uae_u32 lo;
880:
881: lo = r0 + ((r1 << 16) & 0xffff0000ul);
882: if (lo < r0) r3++;
883: r0 = lo;
884: lo = r0 + ((r2 << 16) & 0xffff0000ul);
885: if (lo < r0) r3++;
886: r3 += ((r1 >> 16) & 0xffff) + ((r2 >> 16) & 0xffff);
1.1 root 887: *dst_lo = lo;
888: *dst_hi = r3;
889: }
890:
1.1.1.3 root 891: void m68k_mull (uae_u32 opcode, uae_u32 src, uae_u16 extra)
1.1 root 892: {
1.1.1.3 root 893: #if defined(uae_s64)
1.1 root 894: if (extra & 0x800) {
895: /* signed variant */
1.1.1.3 root 896: uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
1.1 root 897:
1.1.1.3 root 898: a *= (uae_s64)(uae_s32)src;
1.1 root 899: VFLG = CFLG = 0;
900: ZFLG = a == 0;
901: NFLG = a < 0;
902: if (extra & 0x400)
1.1.1.2 root 903: m68k_dreg(regs, extra & 7) = a >> 32;
1.1.1.3 root 904: else if ((a & UVAL64(0xffffffff80000000)) != 0
905: && (a & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
906: {
1.1 root 907: VFLG = 1;
908: }
1.1.1.3 root 909: m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
1.1 root 910: } else {
911: /* unsigned */
1.1.1.3 root 912: uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
913:
914: a *= (uae_u64)src;
1.1 root 915: VFLG = CFLG = 0;
916: ZFLG = a == 0;
1.1.1.3 root 917: NFLG = ((uae_s64)a) < 0;
1.1 root 918: if (extra & 0x400)
1.1.1.2 root 919: m68k_dreg(regs, extra & 7) = a >> 32;
1.1.1.3 root 920: else if ((a & UVAL64(0xffffffff00000000)) != 0) {
1.1 root 921: VFLG = 1;
922: }
1.1.1.3 root 923: m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
1.1 root 924: }
925: #else
926: if (extra & 0x800) {
927: /* signed variant */
1.1.1.3 root 928: uae_s32 src1,src2;
929: uae_u32 dst_lo,dst_hi;
930: uae_u32 sign;
1.1 root 931:
1.1.1.3 root 932: src1 = (uae_s32)src;
933: src2 = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
1.1 root 934: sign = (src1 ^ src2);
935: if (src1 < 0) src1 = -src1;
936: if (src2 < 0) src2 = -src2;
1.1.1.3 root 937: mul_unsigned((uae_u32)src1,(uae_u32)src2,&dst_hi,&dst_lo);
1.1 root 938: if (sign & 0x80000000) {
939: dst_hi = ~dst_hi;
940: dst_lo = -dst_lo;
941: if (dst_lo == 0) dst_hi++;
942: }
943: VFLG = CFLG = 0;
944: ZFLG = dst_hi == 0 && dst_lo == 0;
1.1.1.3 root 945: NFLG = ((uae_s32)dst_hi) < 0;
1.1 root 946: if (extra & 0x400)
1.1.1.2 root 947: m68k_dreg(regs, extra & 7) = dst_hi;
1.1.1.3 root 948: else if ((dst_hi != 0 || (dst_lo & 0x80000000) != 0)
949: && ((dst_hi & 0xffffffff) != 0xffffffff
950: || (dst_lo & 0x80000000) != 0x80000000))
951: {
1.1 root 952: VFLG = 1;
953: }
1.1.1.2 root 954: m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
1.1 root 955: } else {
956: /* unsigned */
1.1.1.3 root 957: uae_u32 dst_lo,dst_hi;
958:
959: mul_unsigned(src,(uae_u32)m68k_dreg(regs, (extra >> 12) & 7),&dst_hi,&dst_lo);
1.1 root 960:
961: VFLG = CFLG = 0;
962: ZFLG = dst_hi == 0 && dst_lo == 0;
1.1.1.3 root 963: NFLG = ((uae_s32)dst_hi) < 0;
1.1 root 964: if (extra & 0x400)
1.1.1.2 root 965: m68k_dreg(regs, extra & 7) = dst_hi;
1.1 root 966: else if (dst_hi != 0) {
967: VFLG = 1;
968: }
1.1.1.2 root 969: m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
1.1 root 970: }
971: #endif
972: }
973: static char* ccnames[] =
974: { "T ","F ","HI","LS","CC","CS","NE","EQ",
975: "VC","VS","PL","MI","GE","LT","GT","LE" };
976:
1.1.1.4 ! root 977: void m68k_reset (void)
1.1 root 978: {
1.1.1.3 root 979: m68k_areg (regs, 7) = get_long (0x00f80000);
980: m68k_setpc (get_long (0x00f80004));
981: fill_prefetch_0 ();
1.1.1.2 root 982: regs.kick_mask = 0xF80000;
1.1 root 983: regs.s = 1;
984: regs.m = 0;
985: regs.stopped = 0;
986: regs.t1 = 0;
987: regs.t0 = 0;
988: ZFLG = CFLG = NFLG = VFLG = 0;
989: regs.spcflags = 0;
990: regs.intmask = 7;
991: regs.vbr = regs.sfc = regs.dfc = 0;
992: regs.fpcr = regs.fpsr = regs.fpiar = 0;
993: }
994:
1.1.1.4 ! root 995: unsigned long REGPARAM2 op_illg (uae_u32 opcode)
1.1 root 996: {
1.1.1.3 root 997: uaecptr pc = m68k_getpc ();
1.1.1.4 ! root 998:
1.1.1.3 root 999: if (cloanto_rom && (opcode & 0xF100) == 0x7100) {
1000: m68k_dreg (regs, (opcode >> 9) & 7) = (uae_s8)(opcode & 0xFF);
1001: m68k_incpc (2);
1002: fill_prefetch_0 ();
1.1.1.4 ! root 1003: return 4;
1.1.1.3 root 1004: }
1005:
1006: compiler_flush_jsr_stack ();
1007: if (opcode == 0x4E7B && get_long (0x10) == 0 && (pc & 0xF80000) == 0xF80000) {
1.1.1.4 ! root 1008: write_log ("Your Kickstart requires a 68020 CPU. Giving up.\n");
1.1.1.3 root 1009: broken_in = 1;
1.1 root 1010: regs.spcflags |= SPCFLAG_BRK;
1011: quit_program = 1;
1012: }
1.1.1.2 root 1013: if (opcode == 0xFF0D) {
1.1.1.3 root 1014: if ((pc & 0xF80000) == 0xF80000) {
1.1.1.2 root 1015: /* This is from the dummy Kickstart replacement */
1.1.1.3 root 1016: uae_u16 arg = get_iword (2);
1017: m68k_incpc (4);
1018: ersatz_perform (arg);
1019: fill_prefetch_0 ();
1.1.1.4 ! root 1020: return 4;
1.1.1.3 root 1021: } else if ((pc & 0xF80000) == 0xF00000) {
1.1.1.2 root 1022: /* User-mode STOP replacement */
1.1.1.3 root 1023: m68k_setstopped (1);
1.1.1.4 ! root 1024: return 4;
1.1.1.2 root 1025: }
1.1 root 1026: }
1.1.1.3 root 1027:
1028: if ((opcode & 0xF000) == 0xA000 && (pc & 0xF80000) == 0xF00000) {
1029: /* Calltrap. */
1030: m68k_incpc(2);
1031: call_calltrap (opcode & 0xFFF);
1032: fill_prefetch_0 ();
1.1.1.4 ! root 1033: return 4;
1.1.1.3 root 1034: }
1035:
1.1 root 1036: if ((opcode & 0xF000) == 0xF000) {
1037: Exception(0xB,0);
1.1.1.4 ! root 1038: return 4;
1.1 root 1039: }
1040: if ((opcode & 0xF000) == 0xA000) {
1.1.1.3 root 1041: if ((pc & 0xF80000) == 0xF00000) {
1042: /* Calltrap. */
1043: call_calltrap (opcode & 0xFFF);
1044: }
1045: Exception(0xA,0);
1.1.1.4 ! root 1046: return 4;
1.1 root 1047: }
1.1.1.4 ! root 1048: write_log ("Illegal instruction: %04x at %08lx\n", opcode, pc);
1.1.1.3 root 1049: Exception (4,0);
1.1.1.4 ! root 1050: return 4;
1.1 root 1051: }
1052:
1.1.1.3 root 1053: void mmu_op(uae_u32 opcode, uae_u16 extra)
1.1 root 1054: {
1055: if ((extra & 0xB000) == 0) { /* PMOVE instruction */
1056:
1057: } else if ((extra & 0xF000) == 0x2000) { /* PLOAD instruction */
1058: } else if ((extra & 0xF000) == 0x8000) { /* PTEST instruction */
1059: } else
1.1.1.3 root 1060: op_illg (opcode);
1.1 root 1061: }
1062:
1.1.1.4 ! root 1063: static int n_insns = 0, n_spcinsns = 0;
1.1 root 1064:
1.1.1.3 root 1065: static uaecptr last_trace_ad = 0;
1.1 root 1066:
1.1.1.4 ! root 1067: static __inline__ void do_trace (void)
1.1 root 1068: {
1069: if (regs.spcflags & SPCFLAG_TRACE) { /* 6 */
1070: if (regs.t0) {
1.1.1.3 root 1071: uae_u16 opcode;
1.1 root 1072: /* should also include TRAP, CHK, SR modification FPcc */
1073: /* probably never used so why bother */
1074: /* We can afford this to be inefficient... */
1.1.1.3 root 1075: m68k_setpc (m68k_getpc ());
1076: fill_prefetch_0 ();
1077: opcode = get_word (regs.pc);
1.1 root 1078: if (opcode == 0x4e72 /* RTE */
1079: || opcode == 0x4e74 /* RTD */
1080: || opcode == 0x4e75 /* RTS */
1081: || opcode == 0x4e77 /* RTR */
1082: || opcode == 0x4e76 /* TRAPV */
1083: || (opcode & 0xffc0) == 0x4e80 /* JSR */
1084: || (opcode & 0xffc0) == 0x4ec0 /* JMP */
1085: || (opcode & 0xff00) == 0x6100 /* BSR */
1086: || ((opcode & 0xf000) == 0x6000 /* Bcc */
1.1.1.3 root 1087: && cctrue((opcode >> 8) & 0xf))
1.1 root 1088: || ((opcode & 0xf0f0) == 0x5050 /* DBcc */
1.1.1.3 root 1089: && !cctrue((opcode >> 8) & 0xf)
1090: && (uae_s16)m68k_dreg(regs, opcode & 7) != 0))
1.1 root 1091: {
1.1.1.4 ! root 1092: last_trace_ad = m68k_getpc ();
1.1 root 1093: regs.spcflags &= ~SPCFLAG_TRACE;
1094: regs.spcflags |= SPCFLAG_DOTRACE;
1095: }
1096: } else if (regs.t1) {
1.1.1.4 ! root 1097: last_trace_ad = m68k_getpc ();
1.1 root 1098: regs.spcflags &= ~SPCFLAG_TRACE;
1099: regs.spcflags |= SPCFLAG_DOTRACE;
1100: }
1101: }
1102: }
1103:
1.1.1.3 root 1104: static int do_specialties (void)
1.1 root 1105: {
1.1.1.3 root 1106: /*n_spcinsns++;*/
1107: while (regs.spcflags & SPCFLAG_BLTNASTY) {
1.1.1.4 ! root 1108: do_cycles (4);
1.1.1.3 root 1109: if (regs.spcflags & SPCFLAG_DISK)
1.1.1.4 ! root 1110: do_disk ();
1.1.1.3 root 1111: }
1112: run_compiled_code();
1113: if (regs.spcflags & SPCFLAG_DOTRACE) {
1.1.1.4 ! root 1114: Exception (9,last_trace_ad);
1.1.1.3 root 1115: }
1116: while (regs.spcflags & SPCFLAG_STOP) {
1.1.1.4 ! root 1117: do_cycles (4);
1.1.1.3 root 1118: if (regs.spcflags & SPCFLAG_DISK)
1.1.1.4 ! root 1119: do_disk ();
1.1.1.3 root 1120: if (regs.spcflags & (SPCFLAG_INT | SPCFLAG_DOINT)){
1.1.1.4 ! root 1121: int intr = intlev ();
1.1.1.3 root 1122: regs.spcflags &= ~(SPCFLAG_INT | SPCFLAG_DOINT);
1123: if (intr != -1 && intr > regs.intmask) {
1.1.1.4 ! root 1124: Interrupt (intr);
1.1.1.3 root 1125: regs.stopped = 0;
1126: regs.spcflags &= ~SPCFLAG_STOP;
1.1.1.2 root 1127: }
1.1.1.3 root 1128: }
1129: }
1.1.1.4 ! root 1130: do_trace ();
! 1131:
1.1.1.3 root 1132: if (regs.spcflags & SPCFLAG_DISK)
1.1.1.4 ! root 1133: do_disk ();
1.1.1.3 root 1134:
1135: if (regs.spcflags & SPCFLAG_DOINT) {
1.1.1.4 ! root 1136: int intr = intlev ();
1.1.1.3 root 1137: regs.spcflags &= ~SPCFLAG_DOINT;
1138: if (intr != -1 && intr > regs.intmask) {
1.1.1.4 ! root 1139: Interrupt (intr);
1.1.1.3 root 1140: regs.stopped = 0;
1141: }
1142: }
1143: if (regs.spcflags & SPCFLAG_INT) {
1144: regs.spcflags &= ~SPCFLAG_INT;
1145: regs.spcflags |= SPCFLAG_DOINT;
1146: }
1.1.1.4 ! root 1147: if (regs.spcflags & (SPCFLAG_BRK | SPCFLAG_MODE_CHANGE)) {
! 1148: regs.spcflags &= ~(SPCFLAG_BRK | SPCFLAG_MODE_CHANGE);
1.1.1.3 root 1149: return 1;
1.1.1.2 root 1150: }
1.1.1.3 root 1151: return 0;
1.1.1.2 root 1152: }
1153:
1.1.1.4 ! root 1154: static void m68k_run_1 (void)
1.1.1.2 root 1155: {
1.1.1.3 root 1156: for (;;) {
1.1.1.4 ! root 1157: int cycles;
! 1158: uae_u32 opcode = GET_OPCODE;
1.1.1.3 root 1159: #if 0
1160: if (get_ilong (0) != do_get_mem_long (®s.prefetch)) {
1161: debugging = 1;
1162: return;
1163: }
1164: #endif
1.1.1.2 root 1165: /* assert (!regs.stopped && !(regs.spcflags & SPCFLAG_STOP)); */
1166: /* regs_backup[backup_pointer = (backup_pointer + 1) % 16] = regs;*/
1.1.1.3 root 1167: #if COUNT_INSTRS == 2
1.1.1.4 ! root 1168: if (table68k[cft_map (opcode)].handler != -1)
! 1169: instrcount[table68k[cft_map (opcode)].handler]++;
1.1.1.3 root 1170: #elif COUNT_INSTRS == 1
1.1.1.2 root 1171: instrcount[opcode]++;
1172: #endif
1173: #if defined(X86_ASSEMBLY)
1.1.1.3 root 1174: __asm__ __volatile__("\tcall *%%ebx"
1.1.1.4 ! root 1175: : "=&a" (cycles) : "b" (cpufunctbl[opcode]), "0" (opcode)
1.1.1.3 root 1176: : "%edx", "%ecx",
1177: "%esi", "%edi", "%ebp", "memory", "cc");
1.1.1.2 root 1178: #else
1.1.1.4 ! root 1179: cycles = (*cpufunctbl[opcode])(opcode);
1.1.1.2 root 1180: #endif
1181: /*n_insns++;*/
1.1.1.4 ! root 1182: cycles &= cycles_mask;
! 1183: cycles |= cycles_val;
! 1184: do_cycles (cycles);
1.1.1.2 root 1185: if (regs.spcflags) {
1.1.1.4 ! root 1186: if (do_specialties ())
1.1 root 1187: return;
1188: }
1189: }
1190: }
1191:
1192: #ifdef X86_ASSEMBLY
1.1.1.4 ! root 1193: static __inline__ void m68k_run1 (void)
1.1 root 1194: {
1195: /* Work around compiler bug: GCC doesn't push %ebp in m68k_run_1. */
1.1.1.3 root 1196: __asm__ __volatile__ ("pushl %%ebp\n\tcall *%0\n\tpopl %%ebp" : : "r" (m68k_run_1) : "%eax", "%edx", "%ecx", "memory", "cc");
1.1 root 1197: }
1.1.1.2 root 1198: #else
1199: #define m68k_run1 m68k_run_1
1200: #endif
1201:
1.1.1.3 root 1202: int in_m68k_go = 0;
1.1 root 1203:
1.1.1.4 ! root 1204: void m68k_go (int may_quit)
1.1 root 1205: {
1.1.1.3 root 1206: if (in_m68k_go || !may_quit) {
1.1.1.4 ! root 1207: write_log ("Bug! m68k_go is not reentrant.\n");
! 1208: abort ();
1.1.1.3 root 1209: }
1.1.1.4 ! root 1210:
! 1211: reset_frame_rate_hack ();
! 1212: update_68k_cycles ();
! 1213:
1.1.1.3 root 1214: in_m68k_go++;
1215: for (;;) {
1216: if (quit_program > 0) {
1217: if (quit_program == 1)
1.1 root 1218: break;
1.1.1.3 root 1219: quit_program = 0;
1.1.1.4 ! root 1220: m68k_reset ();
! 1221: reset_all_systems ();
! 1222: customreset ();
1.1 root 1223: }
1.1.1.3 root 1224: if (debugging)
1.1.1.4 ! root 1225: debug ();
! 1226: m68k_run1 ();
1.1 root 1227: }
1.1.1.3 root 1228: in_m68k_go--;
1.1 root 1229: }
1230:
1.1.1.4 ! root 1231: static void m68k_verify (uaecptr addr, uaecptr *nextpc)
1.1 root 1232: {
1.1.1.3 root 1233: uae_u32 opcode, val;
1234: struct instr *dp;
1235:
1236: opcode = get_iword_1(0);
1237: last_op_for_exception_3 = opcode;
1238: m68kpc_offset = 2;
1239:
1.1.1.4 ! root 1240: if (cpufunctbl[cft_map (opcode)] == op_illg_1) {
1.1.1.3 root 1241: opcode = 0x4AFC;
1242: }
1243: dp = table68k + opcode;
1244:
1245: if (dp->suse) {
1246: if (!verify_ea (dp->sreg, dp->smode, dp->size, &val)) {
1247: Exception (3, 0);
1248: return;
1249: }
1250: }
1251: if (dp->duse) {
1252: if (!verify_ea (dp->dreg, dp->dmode, dp->size, &val)) {
1253: Exception (3, 0);
1254: return;
1255: }
1256: }
1257: }
1258:
1.1.1.4 ! root 1259: void m68k_disasm (uaecptr addr, uaecptr *nextpc, int cnt)
1.1.1.3 root 1260: {
1261: uaecptr newpc = 0;
1.1.1.4 ! root 1262: m68kpc_offset = addr - m68k_getpc ();
! 1263: while (cnt-- > 0) {
1.1 root 1264: char instrname[20],*ccpt;
1265: int opwords;
1.1.1.3 root 1266: uae_u32 opcode;
1.1 root 1267: struct mnemolookup *lookup;
1268: struct instr *dp;
1.1.1.4 ! root 1269: printf ("%08lx: ", m68k_getpc () + m68kpc_offset);
1.1.1.3 root 1270: for (opwords = 0; opwords < 5; opwords++){
1.1.1.4 ! root 1271: printf ("%04x ", get_iword_1 (m68kpc_offset + opwords*2));
1.1 root 1272: }
1.1.1.4 ! root 1273: opcode = get_iword_1 (m68kpc_offset);
1.1.1.3 root 1274: m68kpc_offset += 2;
1.1.1.4 ! root 1275: if (cpufunctbl[cft_map (opcode)] == op_illg_1) {
1.1 root 1276: opcode = 0x4AFC;
1277: }
1278: dp = table68k + opcode;
1279: for (lookup = lookuptab;lookup->mnemo != dp->mnemo; lookup++)
1280: ;
1.1.1.3 root 1281:
1.1.1.4 ! root 1282: strcpy (instrname, lookup->name);
! 1283: ccpt = strstr (instrname, "cc");
1.1 root 1284: if (ccpt != 0) {
1.1.1.4 ! root 1285: strncpy (ccpt, ccnames[dp->cc], 2);
1.1 root 1286: }
1.1.1.3 root 1287: printf ("%s", instrname);
1288: switch (dp->size){
1289: case sz_byte: printf (".B "); break;
1290: case sz_word: printf (".W "); break;
1291: case sz_long: printf (".L "); break;
1292: default: printf (" "); break;
1.1 root 1293: }
1294:
1295: if (dp->suse) {
1.1.1.4 ! root 1296: newpc = m68k_getpc () + m68kpc_offset;
! 1297: newpc += ShowEA (dp->sreg, dp->smode, dp->size, 0);
1.1 root 1298: }
1299: if (dp->suse && dp->duse)
1.1.1.3 root 1300: printf (",");
1.1 root 1301: if (dp->duse) {
1.1.1.4 ! root 1302: newpc = m68k_getpc () + m68kpc_offset;
! 1303: newpc += ShowEA (dp->dreg, dp->dmode, dp->size, 0);
1.1 root 1304: }
1305: if (ccpt != 0) {
1306: if (cctrue(dp->cc))
1.1.1.4 ! root 1307: printf (" == %08lx (TRUE)", newpc);
1.1.1.3 root 1308: else
1.1.1.4 ! root 1309: printf (" == %08lx (FALSE)", newpc);
1.1 root 1310: } else if ((opcode & 0xff00) == 0x6100) /* BSR */
1.1.1.4 ! root 1311: printf (" == %08lx", newpc);
1.1.1.3 root 1312: printf ("\n");
1.1 root 1313: }
1.1.1.4 ! root 1314: if (nextpc)
! 1315: *nextpc = m68k_getpc () + m68kpc_offset;
1.1 root 1316: }
1317:
1.1.1.4 ! root 1318: void m68k_dumpstate (uaecptr *nextpc)
1.1 root 1319: {
1320: int i;
1.1.1.3 root 1321: for (i = 0; i < 8; i++){
1322: printf ("D%d: %08lx ", i, m68k_dreg(regs, i));
1323: if ((i & 3) == 3) printf ("\n");
1324: }
1325: for (i = 0; i < 8; i++){
1326: printf ("A%d: %08lx ", i, m68k_areg(regs, i));
1327: if ((i & 3) == 3) printf ("\n");
1.1 root 1328: }
1.1.1.2 root 1329: if (regs.s == 0) regs.usp = m68k_areg(regs, 7);
1330: if (regs.s && regs.m) regs.msp = m68k_areg(regs, 7);
1331: if (regs.s && regs.m == 0) regs.isp = m68k_areg(regs, 7);
1.1.1.3 root 1332: printf ("USP=%08lx ISP=%08lx MSP=%08lx VBR=%08lx\n",
1.1 root 1333: regs.usp,regs.isp,regs.msp,regs.vbr);
1334: printf ("T=%d%d S=%d M=%d X=%d N=%d Z=%d V=%d C=%d IMASK=%d\n",
1335: regs.t1, regs.t0, regs.s, regs.m,
1336: XFLG, NFLG, ZFLG, VFLG, CFLG, regs.intmask);
1.1.1.3 root 1337: for (i = 0; i < 8; i++){
1338: printf ("FP%d: %g ", i, regs.fp[i]);
1339: if ((i & 3) == 3) printf ("\n");
1.1 root 1340: }
1.1.1.3 root 1341: printf ("N=%d Z=%d I=%d NAN=%d\n",
1.1 root 1342: (regs.fpsr & 0x8000000) != 0,
1343: (regs.fpsr & 0x4000000) != 0,
1344: (regs.fpsr & 0x2000000) != 0,
1345: (regs.fpsr & 0x1000000) != 0);
1.1.1.3 root 1346: if (currprefs.cpu_compatible)
1347: printf ("prefetch %08lx\n", (unsigned long)do_get_mem_long(®s.prefetch));
1348:
1.1.1.4 ! root 1349: m68k_disasm(m68k_getpc (), nextpc, 1);
! 1350: if (nextpc)
! 1351: printf ("next PC: %08lx\n", *nextpc);
1.1 root 1352: }
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