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1.1 root 1: /*
2: * UAE - The Un*x Amiga Emulator
3: *
4: * MC68000 emulation
5: *
6: * Copyright 1995 Bernd Schmidt
7: */
8:
9: extern int areg_byteinc[];
10: extern int imm8_table[];
11:
12: extern int movem_index1[256];
13: extern int movem_index2[256];
14: extern int movem_next[256];
15:
16: extern int fpp_movem_index1[256];
17: extern int fpp_movem_index2[256];
18: extern int fpp_movem_next[256];
19:
20: extern int broken_in;
1.1.1.2 ! root 21: extern int may_run_compiled;
1.1 root 22:
23: typedef void cpuop_func(ULONG) REGPARAM;
24:
25: struct cputbl {
26: cpuop_func *handler;
27: int specific;
28: UWORD opcode;
29: };
30:
31: extern void op_illg(ULONG) REGPARAM;
32:
1.1.1.2 ! root 33: typedef char flagtype;
1.1 root 34:
35: /* Arrrghh.. */
36:
37: #if defined(USE_COMPILER) && !defined(USE_POINTER)
38: #define USE_POINTER
39: #undef NEED_TO_DEBUG_BADLY
40: #endif
41: #if defined(NEED_TO_DEBUG_BADLY) && !defined(USE_POINTER)
42: #define USE_POINTER
43: #endif
44:
45: extern struct regstruct
46: {
1.1.1.2 ! root 47: ULONG regs[16];
! 48: CPTR usp,isp,msp;
1.1 root 49: UWORD sr;
50: flagtype t1;
51: flagtype t0;
52: flagtype s;
53: flagtype m;
54: flagtype x;
55: flagtype stopped;
56: int intmask;
57: ULONG pc;
58: #ifdef USE_POINTER
59: UBYTE *pc_p;
60: UBYTE *pc_oldp;
61: #endif
62:
63: ULONG vbr,sfc,dfc;
64:
65: double fp[8];
66: ULONG fpcr,fpsr,fpiar;
1.1.1.2 ! root 67: #ifdef USE_EXECLIB
! 68: volatile
! 69: #endif
1.1 root 70: ULONG spcflags;
1.1.1.2 ! root 71: ULONG kick_mask;
1.1 root 72: } regs, lastint_regs;
73:
1.1.1.2 ! root 74: #define m68k_dreg(r,num) ((r).regs[(num)])
! 75: #define m68k_areg(r,num) ((r).regs[(num)+8])
1.1 root 76:
77: #ifdef USE_POINTER
1.1.1.2 ! root 78: static __inline__ ULONG nextibyte(void)
1.1 root 79: {
1.1.1.2 ! root 80: ULONG r = do_get_mem_byte(regs.pc_p+1);
! 81: regs.pc_p += 2;
! 82: return r;
! 83: }
! 84:
! 85: static __inline__ ULONG nextiword(void)
! 86: {
! 87: ULONG r = do_get_mem_word((UWORD *)regs.pc_p);
1.1 root 88: regs.pc_p += 2;
89: return r;
90: }
91:
92: static __inline__ ULONG nextilong(void)
93: {
1.1.1.2 ! root 94: ULONG r = do_get_mem_long((ULONG *)regs.pc_p);
1.1 root 95: regs.pc_p += 4;
96: return r;
97: }
98: #else
99:
1.1.1.2 ! root 100: static __inline__ ULONG nextibyte(void)
1.1 root 101: {
1.1.1.2 ! root 102: ULONG r = get_byte(regs.pc+1);
! 103: regs.pc += 2;
! 104: return r;
! 105: }
! 106:
! 107: static __inline__ ULONG nextiword(void)
! 108: {
! 109: ULONG r = get_aword(regs.pc);
1.1 root 110: regs.pc += 2;
111: return r;
112: }
113:
114: static __inline__ ULONG nextilong(void)
115: {
116: ULONG r = get_along(regs.pc);
117: regs.pc += 4;
118: return r;
119: }
120:
121: #endif
122:
123: #ifdef USE_POINTER
124:
125: #if !defined(NEED_TO_DEBUG_BADLY) && !defined(USE_COMPILER)
126: static __inline__ void m68k_setpc(CPTR newpc)
127: {
128: regs.pc_p = regs.pc_oldp = get_real_address(newpc);
1.1.1.2 ! root 129: regs.pc = newpc;
! 130: #if USER_PROGRAMS_BEHAVE > 0
! 131: if ((newpc & 0xF80000) != regs.kick_mask)
! 132: regs.spcflags |= SPCFLAG_MODE_CHANGE;
! 133: regs.kick_mask = newpc & 0xF80000;
! 134: #endif
1.1 root 135: }
136: #else
137: extern void m68k_setpc(CPTR newpc);
138: #endif
139:
140: static __inline__ CPTR m68k_getpc(void)
141: {
142: return regs.pc + ((char *)regs.pc_p - (char *)regs.pc_oldp);
143: }
144:
145: #else
146:
147: static __inline__ void m68k_setpc(CPTR newpc)
148: {
149: regs.pc = newpc;
150: }
151:
152: static __inline__ CPTR m68k_getpc(void)
153: {
154: return regs.pc;
155: }
156: #endif
157:
158: #ifdef USE_COMPILER
159: extern void m68k_setpc_fast(CPTR newpc);
160: extern void m68k_setpc_bcc(CPTR newpc);
161: extern void m68k_setpc_rte(CPTR newpc);
162: #else
163: #define m68k_setpc_fast m68k_setpc
164: #define m68k_setpc_bcc m68k_setpc
165: #define m68k_setpc_rte m68k_setpc
166: #endif
167:
168: static __inline__ void m68k_setstopped(int stop)
169: {
170: regs.stopped = stop;
171: if (stop)
172: regs.spcflags |= SPCFLAG_STOP;
173: }
174:
175: #if CPU_LEVEL > 1
176: static __inline__ ULONG get_disp_ea (ULONG base)
177: {
178: UWORD dp = nextiword();
1.1.1.2 ! root 179: int reg = (dp >> 12) & 15;
! 180: LONG regd = regs.regs[reg];
1.1 root 181: if ((dp & 0x800) == 0)
182: regd = (LONG)(WORD)regd;
183: regd <<= (dp >> 9) & 3;
184: if (dp & 0x100) {
185: LONG outer = 0;
186: if (dp & 0x80) base = 0;
187: if (dp & 0x40) regd = 0;
188:
189: if ((dp & 0x30) == 0x20) base += (LONG)(WORD)nextiword();
190: if ((dp & 0x30) == 0x30) base += nextilong();
191:
192: if ((dp & 0x3) == 0x2) outer = (LONG)(WORD)nextiword();
193: if ((dp & 0x3) == 0x3) outer = nextilong();
194:
195: if ((dp & 0x4) == 0) base += regd;
196: if (dp & 0x3) base = get_long (base);
197: if (dp & 0x4) base += regd;
198:
199: return base + outer;
200: } else {
201: return base + (LONG)((BYTE)dp) + regd;
202: }
203: }
204: #else
205: static __inline__ ULONG get_disp_ea (ULONG base)
206: {
207: UWORD dp = nextiword();
1.1.1.2 ! root 208: int reg = (dp >> 12) & 15;
! 209: LONG regd = regs.regs[reg];
1.1 root 210: if ((dp & 0x800) == 0)
211: regd = (LONG)(WORD)regd;
212: return base + (BYTE)(dp) + regd;
213: }
214: #endif
215:
1.1.1.2 ! root 216: extern LONG ShowEA(int reg, amodes mode, wordsizes size, char *buf);
! 217:
1.1 root 218: extern void MakeSR(void);
219: extern void MakeFromSR(void);
220: extern void Exception(int, CPTR);
221: extern void dump_counts(void);
222: extern void m68k_move2c(int, ULONG *);
223: extern void m68k_movec2(int, ULONG *);
224: extern void m68k_divl (ULONG, ULONG, UWORD, CPTR);
225: extern void m68k_mull (ULONG, ULONG, UWORD);
226: extern void init_m68k (void);
227: extern void m68k_go(int);
228: extern void m68k_dumpstate(CPTR *);
229: extern void m68k_disasm(CPTR,CPTR *,int);
230: extern void m68k_reset(void);
1.1.1.2 ! root 231:
1.1 root 232: extern void mmu_op (ULONG, UWORD);
1.1.1.2 ! root 233:
1.1 root 234: extern void fpp_opp (ULONG, UWORD);
235: extern void fdbcc_opp (ULONG, UWORD);
236: extern void fscc_opp (ULONG, UWORD);
237: extern void ftrapcc_opp (ULONG,CPTR);
238: extern void fbcc_opp (ULONG, CPTR, ULONG);
239: extern void fsave_opp (ULONG);
240: extern void frestore_opp (ULONG);
241:
1.1.1.2 ! root 242: #ifdef MEMFUNCS_DIRECT_REQUESTED
! 243: #define CPU_OP_NAME(a) op_direct ## a
! 244: #else
! 245: #define CPU_OP_NAME(a) op ## a
! 246: #endif
! 247:
! 248: extern struct cputbl op_smalltbl[];
! 249: extern struct cputbl op_direct_smalltbl[];
! 250:
! 251: #ifndef INTEL_FLAG_OPT
! 252: extern cpuop_func *cpufunctbl[65536];
! 253: #if USER_PROGRAMS_BEHAVE > 0
! 254: extern cpuop_func *cpufunctbl_behaved[65536];
! 255: #endif
! 256: #else
! 257: extern cpuop_func *cpufunctbl[65536] __asm__ ("cpufunctbl");
! 258: #if USER_PROGRAMS_BEHAVE > 0
! 259: extern cpuop_func *cpufunctbl_behaved[65536] __asm__ ("cpufunctbl_behaved");;
! 260: #endif
! 261: #endif
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