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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: * Copyright 1995 Bernd Schmidt
7: */
8:
1.1.1.10 root 9: #include "readcpu.h"
10: #include "machdep/m68k.h"
1.1.1.6 root 11:
12: #ifndef SET_CFLG
13:
14: #define SET_CFLG(x) (CFLG = (x))
15: #define SET_NFLG(x) (NFLG = (x))
16: #define SET_VFLG(x) (VFLG = (x))
17: #define SET_ZFLG(x) (ZFLG = (x))
18: #define SET_XFLG(x) (XFLG = (x))
19:
20: #define GET_CFLG CFLG
21: #define GET_NFLG NFLG
22: #define GET_VFLG VFLG
23: #define GET_ZFLG ZFLG
24: #define GET_XFLG XFLG
25:
26: #define CLEAR_CZNV do { \
27: SET_CFLG (0); \
28: SET_ZFLG (0); \
29: SET_NFLG (0); \
30: SET_VFLG (0); \
1.1.1.7 root 31: } while (0)
1.1.1.6 root 32:
33: #define COPY_CARRY (SET_XFLG (GET_CFLG))
34: #endif
35:
1.1 root 36: extern int areg_byteinc[];
37: extern int imm8_table[];
38:
39: extern int movem_index1[256];
40: extern int movem_index2[256];
41: extern int movem_next[256];
42:
43: extern int fpp_movem_index1[256];
44: extern int fpp_movem_index2[256];
45: extern int fpp_movem_next[256];
46:
47: extern int broken_in;
48:
1.1.1.4 root 49: typedef unsigned long cpuop_func (uae_u32) REGPARAM;
1.1 root 50:
51: struct cputbl {
52: cpuop_func *handler;
53: int specific;
1.1.1.3 root 54: uae_u16 opcode;
1.1 root 55: };
56:
1.1.1.4 root 57: extern unsigned long op_illg (uae_u32) REGPARAM;
1.1 root 58:
1.1.1.2 root 59: typedef char flagtype;
1.1 root 60:
1.1.1.11! root 61: /* You can set this to long double to be more accurate. However, the
! 62: resulting alignment issues will cost a lot of performance in some
! 63: apps */
! 64: #define USE_LONG_DOUBLE 0
! 65:
! 66: #if USE_LONG_DOUBLE
! 67: typedef long double fptype;
! 68: #else
! 69: typedef double fptype;
! 70: #endif
! 71:
1.1.1.3 root 72: extern struct regstruct
1.1 root 73: {
1.1.1.3 root 74: uae_u32 regs[16];
75: uaecptr usp,isp,msp;
76: uae_u16 sr;
1.1 root 77: flagtype t1;
78: flagtype t0;
79: flagtype s;
80: flagtype m;
81: flagtype x;
82: flagtype stopped;
83: int intmask;
1.1.1.3 root 84:
85: uae_u32 pc;
86: uae_u8 *pc_p;
87: uae_u8 *pc_oldp;
88:
89: uae_u32 vbr,sfc,dfc;
1.1 root 90:
1.1.1.11! root 91: fptype fp[8];
! 92: fptype fp_result;
! 93:
1.1.1.3 root 94: uae_u32 fpcr,fpsr,fpiar;
1.1.1.11! root 95: uae_u32 fpsr_highbyte;
1.1.1.3 root 96:
97: uae_u32 spcflags;
98: uae_u32 kick_mask;
99:
100: /* Fellow sources say this is 4 longwords. That's impossible. It needs
101: * to be at least a longword. The HRM has some cryptic comment about two
102: * instructions being on the same longword boundary.
103: * The way this is implemented now seems like a good compromise.
104: */
105: uae_u32 prefetch;
1.1 root 106: } regs, lastint_regs;
107:
1.1.1.10 root 108: STATIC_INLINE void set_special (uae_u32 x)
109: {
110: regs.spcflags |= x;
111: }
112:
113: STATIC_INLINE void unset_special (uae_u32 x)
114: {
115: regs.spcflags &= ~x;
116: }
117:
1.1.1.2 root 118: #define m68k_dreg(r,num) ((r).regs[(num)])
1.1.1.4 root 119: #define m68k_areg(r,num) (((r).regs + 8)[(num)])
1.1 root 120:
1.1.1.3 root 121: #define get_ibyte(o) do_get_mem_byte((uae_u8 *)(regs.pc_p + (o) + 1))
122: #define get_iword(o) do_get_mem_word((uae_u16 *)(regs.pc_p + (o)))
123: #define get_ilong(o) do_get_mem_long((uae_u32 *)(regs.pc_p + (o)))
124:
1.1.1.7 root 125: STATIC_INLINE uae_u32 get_ibyte_prefetch (uae_s32 o)
1.1 root 126: {
1.1.1.3 root 127: if (o > 3 || o < 0)
128: return do_get_mem_byte((uae_u8 *)(regs.pc_p + o + 1));
129:
130: return do_get_mem_byte((uae_u8 *)(((uae_u8 *)®s.prefetch) + o + 1));
1.1.1.2 root 131: }
1.1.1.7 root 132: STATIC_INLINE uae_u32 get_iword_prefetch (uae_s32 o)
1.1.1.3 root 133: {
134: if (o > 3 || o < 0)
135: return do_get_mem_word((uae_u16 *)(regs.pc_p + o));
1.1.1.2 root 136:
1.1.1.3 root 137: return do_get_mem_word((uae_u16 *)(((uae_u8 *)®s.prefetch) + o));
138: }
1.1.1.7 root 139: STATIC_INLINE uae_u32 get_ilong_prefetch (uae_s32 o)
1.1.1.2 root 140: {
1.1.1.3 root 141: if (o > 3 || o < 0)
142: return do_get_mem_long((uae_u32 *)(regs.pc_p + o));
143: if (o == 0)
144: return do_get_mem_long(®s.prefetch);
145: return (do_get_mem_word (((uae_u16 *)®s.prefetch) + 1) << 16) | do_get_mem_word ((uae_u16 *)(regs.pc_p + 4));
1.1 root 146: }
147:
1.1.1.3 root 148: #define m68k_incpc(o) (regs.pc_p += (o))
149:
1.1.1.7 root 150: STATIC_INLINE void fill_prefetch_0 (void)
1.1 root 151: {
1.1.1.3 root 152: uae_u32 r;
153: #ifdef UNALIGNED_PROFITABLE
154: r = *(uae_u32 *)regs.pc_p;
155: regs.prefetch = r;
156: #else
157: r = do_get_mem_long ((uae_u32 *)regs.pc_p);
158: do_put_mem_long (®s.prefetch, r);
159: #endif
160: }
161:
162: #if 0
1.1.1.7 root 163: STATIC_INLINE void fill_prefetch_2 (void)
1.1.1.3 root 164: {
165: uae_u32 r = do_get_mem_long (®s.prefetch) << 16;
166: uae_u32 r2 = do_get_mem_word (((uae_u16 *)regs.pc_p) + 1);
167: r |= r2;
168: do_put_mem_long (®s.prefetch, r);
1.1 root 169: }
170: #else
1.1.1.3 root 171: #define fill_prefetch_2 fill_prefetch_0
172: #endif
1.1 root 173:
1.1.1.3 root 174: /* These are only used by the 68020/68881 code, and therefore don't
175: * need to handle prefetch. */
1.1.1.7 root 176: STATIC_INLINE uae_u32 next_ibyte (void)
1.1 root 177: {
1.1.1.4 root 178: uae_u32 r = get_ibyte (0);
179: m68k_incpc (2);
1.1.1.2 root 180: return r;
181: }
182:
1.1.1.7 root 183: STATIC_INLINE uae_u32 next_iword (void)
1.1.1.2 root 184: {
1.1.1.4 root 185: uae_u32 r = get_iword (0);
186: m68k_incpc (2);
1.1 root 187: return r;
188: }
189:
1.1.1.7 root 190: STATIC_INLINE uae_u32 next_ilong (void)
1.1 root 191: {
1.1.1.4 root 192: uae_u32 r = get_ilong (0);
193: m68k_incpc (4);
1.1 root 194: return r;
195: }
196:
1.1.1.4 root 197: #if !defined USE_COMPILER
1.1.1.7 root 198: STATIC_INLINE void m68k_setpc (uaecptr newpc)
1.1 root 199: {
200: regs.pc_p = regs.pc_oldp = get_real_address(newpc);
1.1.1.2 root 201: regs.pc = newpc;
1.1 root 202: }
203: #else
1.1.1.4 root 204: extern void m68k_setpc (uaecptr newpc);
1.1 root 205: #endif
206:
1.1.1.7 root 207: STATIC_INLINE uaecptr m68k_getpc (void)
1.1 root 208: {
209: return regs.pc + ((char *)regs.pc_p - (char *)regs.pc_oldp);
210: }
211:
1.1.1.7 root 212: STATIC_INLINE uaecptr m68k_getpc_p (uae_u8 *p)
1.1.1.4 root 213: {
214: return regs.pc + ((char *)p - (char *)regs.pc_oldp);
215: }
216:
1.1 root 217: #ifdef USE_COMPILER
1.1.1.4 root 218: extern void m68k_setpc_fast (uaecptr newpc);
219: extern void m68k_setpc_bcc (uaecptr newpc);
220: extern void m68k_setpc_rte (uaecptr newpc);
1.1 root 221: #else
222: #define m68k_setpc_fast m68k_setpc
223: #define m68k_setpc_bcc m68k_setpc
224: #define m68k_setpc_rte m68k_setpc
225: #endif
226:
1.1.1.7 root 227: STATIC_INLINE void m68k_setstopped (int stop)
1.1 root 228: {
229: regs.stopped = stop;
230: if (stop)
231: regs.spcflags |= SPCFLAG_STOP;
232: }
233:
1.1.1.5 root 234: extern uae_u32 get_disp_ea_020 (uae_u32 base, uae_u32 dp);
235: extern uae_u32 get_disp_ea_000 (uae_u32 base, uae_u32 dp);
1.1 root 236:
1.1.1.9 root 237: extern uae_s32 ShowEA (FILE *, int reg, amodes mode, wordsizes size, char *buf);
1.1.1.2 root 238:
1.1.1.4 root 239: extern void MakeSR (void);
240: extern void MakeFromSR (void);
241: extern void Exception (int, uaecptr);
242: extern void dump_counts (void);
1.1.1.8 root 243: extern int m68k_move2c (int, uae_u32 *);
244: extern int m68k_movec2 (int, uae_u32 *);
1.1.1.3 root 245: extern void m68k_divl (uae_u32, uae_u32, uae_u16, uaecptr);
246: extern void m68k_mull (uae_u32, uae_u32, uae_u16);
1.1 root 247: extern void init_m68k (void);
1.1.1.4 root 248: extern void m68k_go (int);
1.1.1.9 root 249: extern void m68k_dumpstate (FILE *, uaecptr *);
250: extern void m68k_disasm (FILE *, uaecptr, uaecptr *, int);
1.1.1.4 root 251: extern void m68k_reset (void);
1.1.1.2 root 252:
1.1.1.3 root 253: extern void mmu_op (uae_u32, uae_u16);
1.1.1.2 root 254:
1.1.1.3 root 255: extern void fpp_opp (uae_u32, uae_u16);
256: extern void fdbcc_opp (uae_u32, uae_u16);
257: extern void fscc_opp (uae_u32, uae_u16);
258: extern void ftrapcc_opp (uae_u32,uaecptr);
259: extern void fbcc_opp (uae_u32, uaecptr, uae_u32);
260: extern void fsave_opp (uae_u32);
261: extern void frestore_opp (uae_u32);
262:
263: /* Opcode of faulting instruction */
264: extern uae_u16 last_op_for_exception_3;
265: /* PC at fault time */
266: extern uaecptr last_addr_for_exception_3;
267: /* Address that generated the exception */
268: extern uaecptr last_fault_for_exception_3;
1.1 root 269:
1.1.1.2 root 270: #define CPU_OP_NAME(a) op ## a
271:
1.1.1.10 root 272: /* 68040 */
273: extern struct cputbl op_smalltbl_0_ff[];
1.1.1.3 root 274: /* 68020 + 68881 */
1.1.1.10 root 275: extern struct cputbl op_smalltbl_1_ff[];
1.1.1.3 root 276: /* 68020 */
1.1.1.10 root 277: extern struct cputbl op_smalltbl_2_ff[];
1.1.1.3 root 278: /* 68010 */
1.1.1.10 root 279: extern struct cputbl op_smalltbl_3_ff[];
1.1.1.3 root 280: /* 68000 */
1.1.1.10 root 281: extern struct cputbl op_smalltbl_4_ff[];
1.1.1.3 root 282: /* 68000 slow but compatible. */
1.1.1.10 root 283: extern struct cputbl op_smalltbl_5_ff[];
1.1.1.3 root 284:
285: extern cpuop_func *cpufunctbl[65536] ASM_SYM_FOR_FUNC ("cpufunctbl");
1.1.1.2 root 286:
1.1.1.11! root 287: #ifdef JIT
! 288: #else
! 289: #define flush_icache(X) do {} while (0)
! 290: #endif
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