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source: buchla-emu/cpu/m68kcpu.c@ c3f113d

Last change on this file since c3f113d was 93280c2, checked in by Thomas Lopatic <thomas@…>, 7 years ago
Added Musashi CPU emulator.
Property mode set to `100755`
File size: 36.1 KB

Line
1	/* ======================================================================== */
2	/* ========================= LICENSING & COPYRIGHT ======================== */
3	/* ======================================================================== */
4	/*
5	* MUSASHI
6	* Version 3.4
7	*
8	* A portable Motorola M680x0 processor emulation engine.
9	* Copyright 1998-2001 Karl Stenerud. All rights reserved.
10	*
11	* Permission is hereby granted, free of charge, to any person obtaining a copy
12	* of this software and associated documentation files (the "Software"), to deal
13	* in the Software without restriction, including without limitation the rights
14	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15	* copies of the Software, and to permit persons to whom the Software is
16	* furnished to do so, subject to the following conditions:
17	*
18	* The above copyright notice and this permission notice shall be included in
19	* all copies or substantial portions of the Software.
20
21	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27	* THE SOFTWARE.
28	*/
29
30
31	/* ======================================================================== */
32	/* ================================= NOTES ================================ */
33	/* ======================================================================== */
34
35
36
37	/* ======================================================================== */
38	/* ================================ INCLUDES ============================== */
39	/* ======================================================================== */
40
41	#include "m68kops.h"
42	#include "m68kcpu.h"
43
44	/* ======================================================================== */
45	/* ================================= DATA ================================= */
46	/* ======================================================================== */
47
48	int m68ki_initial_cycles;
49	int m68ki_remaining_cycles = 0; /* Number of clocks remaining */
50	uint m68ki_tracing = 0;
51	uint m68ki_address_space;
52
53	#ifdef M68K_LOG_ENABLE
54	char* m68ki_cpu_names[9] =
55	{
56	"Invalid CPU",
57	"M68000",
58	"M68010",
59	"Invalid CPU",
60	"M68EC020"
61	"Invalid CPU",
62	"Invalid CPU",
63	"Invalid CPU",
64	"M68020"
65	};
66	#endif /* M68K_LOG_ENABLE */
67
68	/* The CPU core */
69	m68ki_cpu_core m68ki_cpu = {0};
70
71	#if M68K_EMULATE_ADDRESS_ERROR
72	jmp_buf m68ki_aerr_trap;
73	#endif /* M68K_EMULATE_ADDRESS_ERROR */
74
75	uint m68ki_aerr_address;
76	uint m68ki_aerr_write_mode;
77	uint m68ki_aerr_fc;
78
79	/* Used by shift & rotate instructions */
80	uint8 m68ki_shift_8_table[65] =
81	{
82	0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff, 0xff, 0xff, 0xff,
83	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
84	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
85	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
86	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
87	0xff, 0xff, 0xff, 0xff, 0xff
88	};
89	uint16 m68ki_shift_16_table[65] =
90	{
91	0x0000, 0x8000, 0xc000, 0xe000, 0xf000, 0xf800, 0xfc00, 0xfe00, 0xff00,
92	0xff80, 0xffc0, 0xffe0, 0xfff0, 0xfff8, 0xfffc, 0xfffe, 0xffff, 0xffff,
93	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
94	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
95	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
96	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
97	0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff,
98	0xffff, 0xffff
99	};
100	uint m68ki_shift_32_table[65] =
101	{
102	0x00000000, 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, 0xf8000000,
103	0xfc000000, 0xfe000000, 0xff000000, 0xff800000, 0xffc00000, 0xffe00000,
104	0xfff00000, 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, 0xffff8000,
105	0xffffc000, 0xffffe000, 0xfffff000, 0xfffff800, 0xfffffc00, 0xfffffe00,
106	0xffffff00, 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, 0xfffffff8,
107	0xfffffffc, 0xfffffffe, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
108	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
109	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
110	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
111	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff,
112	0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff
113	};
114
115
116	/* Number of clock cycles to use for exception processing.
117	* I used 4 for any vectors that are undocumented for processing times.
118	*/
119	uint8 m68ki_exception_cycle_table[3][256] =
120	{
121	{ /* 000 */
122	4, /* 0: Reset - Initial Stack Pointer */
123	4, /* 1: Reset - Initial Program Counter */
124	50, /* 2: Bus Error (unemulated) */
125	50, /* 3: Address Error (unemulated) */
126	34, /* 4: Illegal Instruction */
127	38, /* 5: Divide by Zero -- ASG: changed from 42 */
128	40, /* 6: CHK -- ASG: chanaged from 44 */
129	34, /* 7: TRAPV */
130	34, /* 8: Privilege Violation */
131	34, /* 9: Trace */
132	34, /* 10: 1010 */
133	34, /* 11: 1111 */
134	4, /* 12: RESERVED */
135	4, /* 13: Coprocessor Protocol Violation (unemulated) */
136	4, /* 14: Format Error */
137	44, /* 15: Uninitialized Interrupt */
138	4, /* 16: RESERVED */
139	4, /* 17: RESERVED */
140	4, /* 18: RESERVED */
141	4, /* 19: RESERVED */
142	4, /* 20: RESERVED */
143	4, /* 21: RESERVED */
144	4, /* 22: RESERVED */
145	4, /* 23: RESERVED */
146	44, /* 24: Spurious Interrupt */
147	44, /* 25: Level 1 Interrupt Autovector */
148	44, /* 26: Level 2 Interrupt Autovector */
149	44, /* 27: Level 3 Interrupt Autovector */
150	44, /* 28: Level 4 Interrupt Autovector */
151	44, /* 29: Level 5 Interrupt Autovector */
152	44, /* 30: Level 6 Interrupt Autovector */
153	44, /* 31: Level 7 Interrupt Autovector */
154	34, /* 32: TRAP #0 -- ASG: chanaged from 38 */
155	34, /* 33: TRAP #1 */
156	34, /* 34: TRAP #2 */
157	34, /* 35: TRAP #3 */
158	34, /* 36: TRAP #4 */
159	34, /* 37: TRAP #5 */
160	34, /* 38: TRAP #6 */
161	34, /* 39: TRAP #7 */
162	34, /* 40: TRAP #8 */
163	34, /* 41: TRAP #9 */
164	34, /* 42: TRAP #10 */
165	34, /* 43: TRAP #11 */
166	34, /* 44: TRAP #12 */
167	34, /* 45: TRAP #13 */
168	34, /* 46: TRAP #14 */
169	34, /* 47: TRAP #15 */
170	4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
171	4, /* 49: FP Inexact Result (unemulated) */
172	4, /* 50: FP Divide by Zero (unemulated) */
173	4, /* 51: FP Underflow (unemulated) */
174	4, /* 52: FP Operand Error (unemulated) */
175	4, /* 53: FP Overflow (unemulated) */
176	4, /* 54: FP Signaling NAN (unemulated) */
177	4, /* 55: FP Unimplemented Data Type (unemulated) */
178	4, /* 56: MMU Configuration Error (unemulated) */
179	4, /* 57: MMU Illegal Operation Error (unemulated) */
180	4, /* 58: MMU Access Level Violation Error (unemulated) */
181	4, /* 59: RESERVED */
182	4, /* 60: RESERVED */
183	4, /* 61: RESERVED */
184	4, /* 62: RESERVED */
185	4, /* 63: RESERVED */
186	/* 64-255: User Defined */
187	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
188	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
189	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
190	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
191	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
192	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
193	},
194	{ /* 010 */
195	4, /* 0: Reset - Initial Stack Pointer */
196	4, /* 1: Reset - Initial Program Counter */
197	126, /* 2: Bus Error (unemulated) */
198	126, /* 3: Address Error (unemulated) */
199	38, /* 4: Illegal Instruction */
200	44, /* 5: Divide by Zero */
201	44, /* 6: CHK */
202	34, /* 7: TRAPV */
203	38, /* 8: Privilege Violation */
204	38, /* 9: Trace */
205	4, /* 10: 1010 */
206	4, /* 11: 1111 */
207	4, /* 12: RESERVED */
208	4, /* 13: Coprocessor Protocol Violation (unemulated) */
209	4, /* 14: Format Error */
210	44, /* 15: Uninitialized Interrupt */
211	4, /* 16: RESERVED */
212	4, /* 17: RESERVED */
213	4, /* 18: RESERVED */
214	4, /* 19: RESERVED */
215	4, /* 20: RESERVED */
216	4, /* 21: RESERVED */
217	4, /* 22: RESERVED */
218	4, /* 23: RESERVED */
219	46, /* 24: Spurious Interrupt */
220	46, /* 25: Level 1 Interrupt Autovector */
221	46, /* 26: Level 2 Interrupt Autovector */
222	46, /* 27: Level 3 Interrupt Autovector */
223	46, /* 28: Level 4 Interrupt Autovector */
224	46, /* 29: Level 5 Interrupt Autovector */
225	46, /* 30: Level 6 Interrupt Autovector */
226	46, /* 31: Level 7 Interrupt Autovector */
227	38, /* 32: TRAP #0 */
228	38, /* 33: TRAP #1 */
229	38, /* 34: TRAP #2 */
230	38, /* 35: TRAP #3 */
231	38, /* 36: TRAP #4 */
232	38, /* 37: TRAP #5 */
233	38, /* 38: TRAP #6 */
234	38, /* 39: TRAP #7 */
235	38, /* 40: TRAP #8 */
236	38, /* 41: TRAP #9 */
237	38, /* 42: TRAP #10 */
238	38, /* 43: TRAP #11 */
239	38, /* 44: TRAP #12 */
240	38, /* 45: TRAP #13 */
241	38, /* 46: TRAP #14 */
242	38, /* 47: TRAP #15 */
243	4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
244	4, /* 49: FP Inexact Result (unemulated) */
245	4, /* 50: FP Divide by Zero (unemulated) */
246	4, /* 51: FP Underflow (unemulated) */
247	4, /* 52: FP Operand Error (unemulated) */
248	4, /* 53: FP Overflow (unemulated) */
249	4, /* 54: FP Signaling NAN (unemulated) */
250	4, /* 55: FP Unimplemented Data Type (unemulated) */
251	4, /* 56: MMU Configuration Error (unemulated) */
252	4, /* 57: MMU Illegal Operation Error (unemulated) */
253	4, /* 58: MMU Access Level Violation Error (unemulated) */
254	4, /* 59: RESERVED */
255	4, /* 60: RESERVED */
256	4, /* 61: RESERVED */
257	4, /* 62: RESERVED */
258	4, /* 63: RESERVED */
259	/* 64-255: User Defined */
260	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
261	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
262	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
263	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
264	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
265	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
266	},
267	{ /* 020 */
268	4, /* 0: Reset - Initial Stack Pointer */
269	4, /* 1: Reset - Initial Program Counter */
270	50, /* 2: Bus Error (unemulated) */
271	50, /* 3: Address Error (unemulated) */
272	20, /* 4: Illegal Instruction */
273	38, /* 5: Divide by Zero */
274	40, /* 6: CHK */
275	20, /* 7: TRAPV */
276	34, /* 8: Privilege Violation */
277	25, /* 9: Trace */
278	20, /* 10: 1010 */
279	20, /* 11: 1111 */
280	4, /* 12: RESERVED */
281	4, /* 13: Coprocessor Protocol Violation (unemulated) */
282	4, /* 14: Format Error */
283	30, /* 15: Uninitialized Interrupt */
284	4, /* 16: RESERVED */
285	4, /* 17: RESERVED */
286	4, /* 18: RESERVED */
287	4, /* 19: RESERVED */
288	4, /* 20: RESERVED */
289	4, /* 21: RESERVED */
290	4, /* 22: RESERVED */
291	4, /* 23: RESERVED */
292	30, /* 24: Spurious Interrupt */
293	30, /* 25: Level 1 Interrupt Autovector */
294	30, /* 26: Level 2 Interrupt Autovector */
295	30, /* 27: Level 3 Interrupt Autovector */
296	30, /* 28: Level 4 Interrupt Autovector */
297	30, /* 29: Level 5 Interrupt Autovector */
298	30, /* 30: Level 6 Interrupt Autovector */
299	30, /* 31: Level 7 Interrupt Autovector */
300	20, /* 32: TRAP #0 */
301	20, /* 33: TRAP #1 */
302	20, /* 34: TRAP #2 */
303	20, /* 35: TRAP #3 */
304	20, /* 36: TRAP #4 */
305	20, /* 37: TRAP #5 */
306	20, /* 38: TRAP #6 */
307	20, /* 39: TRAP #7 */
308	20, /* 40: TRAP #8 */
309	20, /* 41: TRAP #9 */
310	20, /* 42: TRAP #10 */
311	20, /* 43: TRAP #11 */
312	20, /* 44: TRAP #12 */
313	20, /* 45: TRAP #13 */
314	20, /* 46: TRAP #14 */
315	20, /* 47: TRAP #15 */
316	4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
317	4, /* 49: FP Inexact Result (unemulated) */
318	4, /* 50: FP Divide by Zero (unemulated) */
319	4, /* 51: FP Underflow (unemulated) */
320	4, /* 52: FP Operand Error (unemulated) */
321	4, /* 53: FP Overflow (unemulated) */
322	4, /* 54: FP Signaling NAN (unemulated) */
323	4, /* 55: FP Unimplemented Data Type (unemulated) */
324	4, /* 56: MMU Configuration Error (unemulated) */
325	4, /* 57: MMU Illegal Operation Error (unemulated) */
326	4, /* 58: MMU Access Level Violation Error (unemulated) */
327	4, /* 59: RESERVED */
328	4, /* 60: RESERVED */
329	4, /* 61: RESERVED */
330	4, /* 62: RESERVED */
331	4, /* 63: RESERVED */
332	/* 64-255: User Defined */
333	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
334	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
335	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
336	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
337	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
338	4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
339	}
340	};
341
342	uint8 m68ki_ea_idx_cycle_table[64] =
343	{
344	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
345	0, /* ..01.000 no memory indirect, base NULL */
346	5, /* ..01..01 memory indirect, base NULL, outer NULL */
347	7, /* ..01..10 memory indirect, base NULL, outer 16 */
348	7, /* ..01..11 memory indirect, base NULL, outer 32 */
349	0, 5, 7, 7, 0, 5, 7, 7, 0, 5, 7, 7,
350	2, /* ..10.000 no memory indirect, base 16 */
351	7, /* ..10..01 memory indirect, base 16, outer NULL */
352	9, /* ..10..10 memory indirect, base 16, outer 16 */
353	9, /* ..10..11 memory indirect, base 16, outer 32 */
354	0, 7, 9, 9, 0, 7, 9, 9, 0, 7, 9, 9,
355	6, /* ..11.000 no memory indirect, base 32 */
356	11, /* ..11..01 memory indirect, base 32, outer NULL */
357	13, /* ..11..10 memory indirect, base 32, outer 16 */
358	13, /* ..11..11 memory indirect, base 32, outer 32 */
359	0, 11, 13, 13, 0, 11, 13, 13, 0, 11, 13, 13
360	};
361
362
363
364	/* ======================================================================== */
365	/* =============================== CALLBACKS ============================== */
366	/* ======================================================================== */
367
368	/* Default callbacks used if the callback hasn't been set yet, or if the
369	* callback is set to NULL
370	*/
371
372	/* Interrupt acknowledge */
373	static int default_int_ack_callback_data;
374	static int default_int_ack_callback(int int_level)
375	{
376	default_int_ack_callback_data = int_level;
377	CPU_INT_LEVEL = 0;
378	return M68K_INT_ACK_AUTOVECTOR;
379	}
380
381	/* Breakpoint acknowledge */
382	static unsigned int default_bkpt_ack_callback_data;
383	static void default_bkpt_ack_callback(unsigned int data)
384	{
385	default_bkpt_ack_callback_data = data;
386	}
387
388	/* Called when a reset instruction is executed */
389	static void default_reset_instr_callback(void)
390	{
391	}
392
393	/* Called when the program counter changed by a large value */
394	static unsigned int default_pc_changed_callback_data;
395	static void default_pc_changed_callback(unsigned int new_pc)
396	{
397	default_pc_changed_callback_data = new_pc;
398	}
399
400	/* Called every time there's bus activity (read/write to/from memory */
401	static unsigned int default_set_fc_callback_data;
402	static void default_set_fc_callback(unsigned int new_fc)
403	{
404	default_set_fc_callback_data = new_fc;
405	}
406
407	/* Called every instruction cycle prior to execution */
408	static void default_instr_hook_callback(void)
409	{
410	}
411
412
413	#if M68K_EMULATE_ADDRESS_ERROR
414	#include <setjmp.h>
415	jmp_buf m68ki_aerr_trap;
416	#endif /* M68K_EMULATE_ADDRESS_ERROR */
417
418
419	/* ======================================================================== */
420	/* ================================= API ================================== */
421	/* ======================================================================== */
422
423	/* Access the internals of the CPU */
424	unsigned int m68k_get_reg(void* context, m68k_register_t regnum)
425	{
426	m68ki_cpu_core* cpu = context != NULL ?(m68ki_cpu_core*)context : &m68ki_cpu;
427
428	switch(regnum)
429	{
430	case M68K_REG_D0: return cpu->dar[0];
431	case M68K_REG_D1: return cpu->dar[1];
432	case M68K_REG_D2: return cpu->dar[2];
433	case M68K_REG_D3: return cpu->dar[3];
434	case M68K_REG_D4: return cpu->dar[4];
435	case M68K_REG_D5: return cpu->dar[5];
436	case M68K_REG_D6: return cpu->dar[6];
437	case M68K_REG_D7: return cpu->dar[7];
438	case M68K_REG_A0: return cpu->dar[8];
439	case M68K_REG_A1: return cpu->dar[9];
440	case M68K_REG_A2: return cpu->dar[10];
441	case M68K_REG_A3: return cpu->dar[11];
442	case M68K_REG_A4: return cpu->dar[12];
443	case M68K_REG_A5: return cpu->dar[13];
444	case M68K_REG_A6: return cpu->dar[14];
445	case M68K_REG_A7: return cpu->dar[15];
446	case M68K_REG_PC: return MASK_OUT_ABOVE_32(cpu->pc);
447	case M68K_REG_SR: return cpu->t1_flag \|
448	cpu->t0_flag \|
449	(cpu->s_flag << 11) \|
450	(cpu->m_flag << 11) \|
451	cpu->int_mask \|
452	((cpu->x_flag & XFLAG_SET) >> 4) \|
453	((cpu->n_flag & NFLAG_SET) >> 4) \|
454	((!cpu->not_z_flag) << 2) \|
455	((cpu->v_flag & VFLAG_SET) >> 6) \|
456	((cpu->c_flag & CFLAG_SET) >> 8);
457	case M68K_REG_SP: return cpu->dar[15];
458	case M68K_REG_USP: return cpu->s_flag ? cpu->sp[0] : cpu->dar[15];
459	case M68K_REG_ISP: return cpu->s_flag && !cpu->m_flag ? cpu->dar[15] : cpu->sp[4];
460	case M68K_REG_MSP: return cpu->s_flag && cpu->m_flag ? cpu->dar[15] : cpu->sp[6];
461	case M68K_REG_SFC: return cpu->sfc;
462	case M68K_REG_DFC: return cpu->dfc;
463	case M68K_REG_VBR: return cpu->vbr;
464	case M68K_REG_CACR: return cpu->cacr;
465	case M68K_REG_CAAR: return cpu->caar;
466	case M68K_REG_PREF_ADDR: return cpu->pref_addr;
467	case M68K_REG_PREF_DATA: return cpu->pref_data;
468	case M68K_REG_PPC: return MASK_OUT_ABOVE_32(cpu->ppc);
469	case M68K_REG_IR: return cpu->ir;
470	case M68K_REG_CPU_TYPE:
471	switch(cpu->cpu_type)
472	{
473	case CPU_TYPE_000: return (unsigned int)M68K_CPU_TYPE_68000;
474	case CPU_TYPE_010: return (unsigned int)M68K_CPU_TYPE_68010;
475	case CPU_TYPE_EC020: return (unsigned int)M68K_CPU_TYPE_68EC020;
476	case CPU_TYPE_020: return (unsigned int)M68K_CPU_TYPE_68020;
477	}
478	return M68K_CPU_TYPE_INVALID;
479	default: return 0;
480	}
481	return 0;
482	}
483
484	void m68k_set_reg(m68k_register_t regnum, unsigned int value)
485	{
486	switch(regnum)
487	{
488	case M68K_REG_D0: REG_D[0] = MASK_OUT_ABOVE_32(value); return;
489	case M68K_REG_D1: REG_D[1] = MASK_OUT_ABOVE_32(value); return;
490	case M68K_REG_D2: REG_D[2] = MASK_OUT_ABOVE_32(value); return;
491	case M68K_REG_D3: REG_D[3] = MASK_OUT_ABOVE_32(value); return;
492	case M68K_REG_D4: REG_D[4] = MASK_OUT_ABOVE_32(value); return;
493	case M68K_REG_D5: REG_D[5] = MASK_OUT_ABOVE_32(value); return;
494	case M68K_REG_D6: REG_D[6] = MASK_OUT_ABOVE_32(value); return;
495	case M68K_REG_D7: REG_D[7] = MASK_OUT_ABOVE_32(value); return;
496	case M68K_REG_A0: REG_A[0] = MASK_OUT_ABOVE_32(value); return;
497	case M68K_REG_A1: REG_A[1] = MASK_OUT_ABOVE_32(value); return;
498	case M68K_REG_A2: REG_A[2] = MASK_OUT_ABOVE_32(value); return;
499	case M68K_REG_A3: REG_A[3] = MASK_OUT_ABOVE_32(value); return;
500	case M68K_REG_A4: REG_A[4] = MASK_OUT_ABOVE_32(value); return;
501	case M68K_REG_A5: REG_A[5] = MASK_OUT_ABOVE_32(value); return;
502	case M68K_REG_A6: REG_A[6] = MASK_OUT_ABOVE_32(value); return;
503	case M68K_REG_A7: REG_A[7] = MASK_OUT_ABOVE_32(value); return;
504	case M68K_REG_PC: m68ki_jump(MASK_OUT_ABOVE_32(value)); return;
505	case M68K_REG_SR: m68ki_set_sr(value); return;
506	case M68K_REG_SP: REG_SP = MASK_OUT_ABOVE_32(value); return;
507	case M68K_REG_USP: if(FLAG_S)
508	REG_USP = MASK_OUT_ABOVE_32(value);
509	else
510	REG_SP = MASK_OUT_ABOVE_32(value);
511	return;
512	case M68K_REG_ISP: if(FLAG_S && !FLAG_M)
513	REG_SP = MASK_OUT_ABOVE_32(value);
514	else
515	REG_ISP = MASK_OUT_ABOVE_32(value);
516	return;
517	case M68K_REG_MSP: if(FLAG_S && FLAG_M)
518	REG_SP = MASK_OUT_ABOVE_32(value);
519	else
520	REG_MSP = MASK_OUT_ABOVE_32(value);
521	return;
522	case M68K_REG_VBR: REG_VBR = MASK_OUT_ABOVE_32(value); return;
523	case M68K_REG_SFC: REG_SFC = value & 7; return;
524	case M68K_REG_DFC: REG_DFC = value & 7; return;
525	case M68K_REG_CACR: REG_CACR = MASK_OUT_ABOVE_32(value); return;
526	case M68K_REG_CAAR: REG_CAAR = MASK_OUT_ABOVE_32(value); return;
527	case M68K_REG_PPC: REG_PPC = MASK_OUT_ABOVE_32(value); return;
528	case M68K_REG_IR: REG_IR = MASK_OUT_ABOVE_16(value); return;
529	case M68K_REG_CPU_TYPE: m68k_set_cpu_type(value); return;
530	default: return;
531	}
532	}
533
534	/* Set the callbacks */
535	void m68k_set_int_ack_callback(int (*callback)(int int_level))
536	{
537	CALLBACK_INT_ACK = callback ? callback : default_int_ack_callback;
538	}
539
540	void m68k_set_bkpt_ack_callback(void (*callback)(unsigned int data))
541	{
542	CALLBACK_BKPT_ACK = callback ? callback : default_bkpt_ack_callback;
543	}
544
545	void m68k_set_reset_instr_callback(void (*callback)(void))
546	{
547	CALLBACK_RESET_INSTR = callback ? callback : default_reset_instr_callback;
548	}
549
550	void m68k_set_pc_changed_callback(void (*callback)(unsigned int new_pc))
551	{
552	CALLBACK_PC_CHANGED = callback ? callback : default_pc_changed_callback;
553	}
554
555	void m68k_set_fc_callback(void (*callback)(unsigned int new_fc))
556	{
557	CALLBACK_SET_FC = callback ? callback : default_set_fc_callback;
558	}
559
560	void m68k_set_instr_hook_callback(void (*callback)(void))
561	{
562	CALLBACK_INSTR_HOOK = callback ? callback : default_instr_hook_callback;
563	}
564
565	#include <stdio.h>
566	/* Set the CPU type. */
567	void m68k_set_cpu_type(unsigned int cpu_type)
568	{
569	switch(cpu_type)
570	{
571	case M68K_CPU_TYPE_68000:
572	CPU_TYPE = CPU_TYPE_000;
573	CPU_ADDRESS_MASK = 0x00ffffff;
574	CPU_SR_MASK = 0xa71f; /* T1 -- S -- -- I2 I1 I0 -- -- -- X N Z V C */
575	CYC_INSTRUCTION = m68ki_cycles[0];
576	CYC_EXCEPTION = m68ki_exception_cycle_table[0];
577	CYC_BCC_NOTAKE_B = -2;
578	CYC_BCC_NOTAKE_W = 2;
579	CYC_DBCC_F_NOEXP = -2;
580	CYC_DBCC_F_EXP = 2;
581	CYC_SCC_R_TRUE = 2;
582	CYC_MOVEM_W = 2;
583	CYC_MOVEM_L = 3;
584	CYC_SHIFT = 1;
585	CYC_RESET = 132;
586	return;
587	case M68K_CPU_TYPE_68010:
588	CPU_TYPE = CPU_TYPE_010;
589	CPU_ADDRESS_MASK = 0x00ffffff;
590	CPU_SR_MASK = 0xa71f; /* T1 -- S -- -- I2 I1 I0 -- -- -- X N Z V C */
591	CYC_INSTRUCTION = m68ki_cycles[1];
592	CYC_EXCEPTION = m68ki_exception_cycle_table[1];
593	CYC_BCC_NOTAKE_B = -4;
594	CYC_BCC_NOTAKE_W = 0;
595	CYC_DBCC_F_NOEXP = 0;
596	CYC_DBCC_F_EXP = 6;
597	CYC_SCC_R_TRUE = 0;
598	CYC_MOVEM_W = 2;
599	CYC_MOVEM_L = 3;
600	CYC_SHIFT = 1;
601	CYC_RESET = 130;
602	return;
603	case M68K_CPU_TYPE_68EC020:
604	CPU_TYPE = CPU_TYPE_EC020;
605	CPU_ADDRESS_MASK = 0x00ffffff;
606	CPU_SR_MASK = 0xf71f; /* T1 T0 S M -- I2 I1 I0 -- -- -- X N Z V C */
607	CYC_INSTRUCTION = m68ki_cycles[2];
608	CYC_EXCEPTION = m68ki_exception_cycle_table[2];
609	CYC_BCC_NOTAKE_B = -2;
610	CYC_BCC_NOTAKE_W = 0;
611	CYC_DBCC_F_NOEXP = 0;
612	CYC_DBCC_F_EXP = 4;
613	CYC_SCC_R_TRUE = 0;
614	CYC_MOVEM_W = 2;
615	CYC_MOVEM_L = 2;
616	CYC_SHIFT = 0;
617	CYC_RESET = 518;
618	return;
619	case M68K_CPU_TYPE_68020:
620	CPU_TYPE = CPU_TYPE_020;
621	CPU_ADDRESS_MASK = 0xffffffff;
622	CPU_SR_MASK = 0xf71f; /* T1 T0 S M -- I2 I1 I0 -- -- -- X N Z V C */
623	CYC_INSTRUCTION = m68ki_cycles[2];
624	CYC_EXCEPTION = m68ki_exception_cycle_table[2];
625	CYC_BCC_NOTAKE_B = -2;
626	CYC_BCC_NOTAKE_W = 0;
627	CYC_DBCC_F_NOEXP = 0;
628	CYC_DBCC_F_EXP = 4;
629	CYC_SCC_R_TRUE = 0;
630	CYC_MOVEM_W = 2;
631	CYC_MOVEM_L = 2;
632	CYC_SHIFT = 0;
633	CYC_RESET = 518;
634	return;
635	}
636	}
637
638	/* Execute some instructions until we use up num_cycles clock cycles */
639	/* ASG: removed per-instruction interrupt checks */
640	int m68k_execute(int num_cycles)
641	{
642	/* Make sure we're not stopped */
643	if(!CPU_STOPPED)
644	{
645	/* Set our pool of clock cycles available */
646	SET_CYCLES(num_cycles);
647	m68ki_initial_cycles = num_cycles;
648
649	/* ASG: update cycles */
650	USE_CYCLES(CPU_INT_CYCLES);
651	CPU_INT_CYCLES = 0;
652
653	/* Return point if we had an address error */
654	m68ki_set_address_error_trap(); /* auto-disable (see m68kcpu.h) */
655
656	/* Main loop. Keep going until we run out of clock cycles */
657	do
658	{
659	/* Set tracing accodring to T1. (T0 is done inside instruction) */
660	m68ki_trace_t1(); /* auto-disable (see m68kcpu.h) */
661
662	/* Set the address space for reads */
663	m68ki_use_data_space(); /* auto-disable (see m68kcpu.h) */
664
665	/* Call external hook to peek at CPU */
666	m68ki_instr_hook(); /* auto-disable (see m68kcpu.h) */
667
668	/* Record previous program counter */
669	REG_PPC = REG_PC;
670
671	/* Read an instruction and call its handler */
672	REG_IR = m68ki_read_imm_16();
673	m68ki_instruction_jump_table[REG_IR]();
674	USE_CYCLES(CYC_INSTRUCTION[REG_IR]);
675
676	/* Trace m68k_exception, if necessary */
677	m68ki_exception_if_trace(); /* auto-disable (see m68kcpu.h) */
678	} while(GET_CYCLES() > 0);
679
680	/* set previous PC to current PC for the next entry into the loop */
681	REG_PPC = REG_PC;
682
683	/* ASG: update cycles */
684	USE_CYCLES(CPU_INT_CYCLES);
685	CPU_INT_CYCLES = 0;
686
687	/* return how many clocks we used */
688	return m68ki_initial_cycles - GET_CYCLES();
689	}
690
691	/* We get here if the CPU is stopped or halted */
692	SET_CYCLES(0);
693	CPU_INT_CYCLES = 0;
694
695	return num_cycles;
696	}
697
698
699	int m68k_cycles_run(void)
700	{
701	return m68ki_initial_cycles - GET_CYCLES();
702	}
703
704	int m68k_cycles_remaining(void)
705	{
706	return GET_CYCLES();
707	}
708
709	/* Change the timeslice */
710	void m68k_modify_timeslice(int cycles)
711	{
712	m68ki_initial_cycles += cycles;
713	ADD_CYCLES(cycles);
714	}
715
716
717	void m68k_end_timeslice(void)
718	{
719	m68ki_initial_cycles = GET_CYCLES();
720	SET_CYCLES(0);
721	}
722
723
724	/* ASG: rewrote so that the int_level is a mask of the IPL0/IPL1/IPL2 bits */
725	/* KS: Modified so that IPL* bits match with mask positions in the SR
726	* and cleaned out remenants of the interrupt controller.
727	*/
728	void m68k_set_irq(unsigned int int_level)
729	{
730	uint old_level = CPU_INT_LEVEL;
731	CPU_INT_LEVEL = int_level << 8;
732
733	/* A transition from < 7 to 7 always interrupts (NMI) */
734	/* Note: Level 7 can also level trigger like a normal IRQ */
735	if(old_level != 0x0700 && CPU_INT_LEVEL == 0x0700)
736	m68ki_exception_interrupt(7); /* Edge triggered level 7 (NMI) */
737	else
738	m68ki_check_interrupts(); /* Level triggered (IRQ) */
739	}
740
741	void m68k_init(void)
742	{
743	static uint emulation_initialized = 0;
744
745	/* The first call to this function initializes the opcode handler jump table */
746	if(!emulation_initialized)
747	{
748	m68ki_build_opcode_table();
749	emulation_initialized = 1;
750	}
751
752	m68k_set_int_ack_callback(NULL);
753	m68k_set_bkpt_ack_callback(NULL);
754	m68k_set_reset_instr_callback(NULL);
755	m68k_set_pc_changed_callback(NULL);
756	m68k_set_fc_callback(NULL);
757	m68k_set_instr_hook_callback(NULL);
758	}
759
760	/* Pulse the RESET line on the CPU */
761	void m68k_pulse_reset(void)
762	{
763	/* Clear all stop levels and eat up all remaining cycles */
764	CPU_STOPPED = 0;
765	SET_CYCLES(0);
766
767	CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
768	CPU_INSTR_MODE = INSTRUCTION_YES;
769
770	/* Turn off tracing */
771	FLAG_T1 = FLAG_T0 = 0;
772	m68ki_clear_trace();
773	/* Interrupt mask to level 7 */
774	FLAG_INT_MASK = 0x0700;
775	/* Reset VBR */
776	REG_VBR = 0;
777	/* Go to supervisor mode */
778	m68ki_set_sm_flag(SFLAG_SET \| MFLAG_CLEAR);
779
780	/* Invalidate the prefetch queue */
781	#if M68K_EMULATE_PREFETCH
782	/* Set to arbitrary number since our first fetch is from 0 */
783	CPU_PREF_ADDR = 0x1000;
784	#endif /* M68K_EMULATE_PREFETCH */
785
786	/* Read the initial stack pointer and program counter */
787	m68ki_jump(0);
788	REG_SP = m68ki_read_imm_32();
789	REG_PC = m68ki_read_imm_32();
790	m68ki_jump(REG_PC);
791
792	CPU_RUN_MODE = RUN_MODE_NORMAL;
793	}
794
795	/* Pulse the HALT line on the CPU */
796	void m68k_pulse_halt(void)
797	{
798	CPU_STOPPED \|= STOP_LEVEL_HALT;
799	}
800
801
802	/* Get and set the current CPU context */
803	/* This is to allow for multiple CPUs */
804	unsigned int m68k_context_size()
805	{
806	return sizeof(m68ki_cpu_core);
807	}
808
809	unsigned int m68k_get_context(void* dst)
810	{
811	if(dst) (m68ki_cpu_core)dst = m68ki_cpu;
812	return sizeof(m68ki_cpu_core);
813	}
814
815	void m68k_set_context(void* src)
816	{
817	if(src) m68ki_cpu = (m68ki_cpu_core)src;
818	}
819
820
821
822	/* ======================================================================== */
823	/* ============================== MAME STUFF ============================== */
824	/* ======================================================================== */
825
826	#if M68K_COMPILE_FOR_MAME == OPT_ON
827
828	#include "state.h"
829
830	static struct {
831	UINT16 sr;
832	int stopped;
833	int halted;
834	} m68k_substate;
835
836	static void m68k_prepare_substate(void)
837	{
838	m68k_substate.sr = m68ki_get_sr();
839	m68k_substate.stopped = (CPU_STOPPED & STOP_LEVEL_STOP) != 0;
840	m68k_substate.halted = (CPU_STOPPED & STOP_LEVEL_HALT) != 0;
841	}
842
843	static void m68k_post_load(void)
844	{
845	m68ki_set_sr_noint_nosp(m68k_substate.sr);
846	CPU_STOPPED = m68k_substate.stopped ? STOP_LEVEL_STOP : 0
847	\| m68k_substate.halted ? STOP_LEVEL_HALT : 0;
848	m68ki_jump(REG_PC);
849	}
850
851	void m68k_state_register(const char *type)
852	{
853	int cpu = cpu_getactivecpu();
854
855	state_save_register_UINT32(type, cpu, "D" , REG_D, 8);
856	state_save_register_UINT32(type, cpu, "A" , REG_A, 8);
857	state_save_register_UINT32(type, cpu, "PPC" , &REG_PPC, 1);
858	state_save_register_UINT32(type, cpu, "PC" , &REG_PC, 1);
859	state_save_register_UINT32(type, cpu, "USP" , &REG_USP, 1);
860	state_save_register_UINT32(type, cpu, "ISP" , &REG_ISP, 1);
861	state_save_register_UINT32(type, cpu, "MSP" , &REG_MSP, 1);
862	state_save_register_UINT32(type, cpu, "VBR" , &REG_VBR, 1);
863	state_save_register_UINT32(type, cpu, "SFC" , &REG_SFC, 1);
864	state_save_register_UINT32(type, cpu, "DFC" , &REG_DFC, 1);
865	state_save_register_UINT32(type, cpu, "CACR" , &REG_CACR, 1);
866	state_save_register_UINT32(type, cpu, "CAAR" , &REG_CAAR, 1);
867	state_save_register_UINT16(type, cpu, "SR" , &m68k_substate.sr, 1);
868	state_save_register_UINT32(type, cpu, "INT_LEVEL" , &CPU_INT_LEVEL, 1);
869	state_save_register_UINT32(type, cpu, "INT_CYCLES", &CPU_INT_CYCLES, 1);
870	state_save_register_int (type, cpu, "STOPPED" , &m68k_substate.stopped);
871	state_save_register_int (type, cpu, "HALTED" , &m68k_substate.halted);
872	state_save_register_UINT32(type, cpu, "PREF_ADDR" , &CPU_PREF_ADDR, 1);
873	state_save_register_UINT32(type, cpu, "PREF_DATA" , &CPU_PREF_DATA, 1);
874	state_save_register_func_presave(m68k_prepare_substate);
875	state_save_register_func_postload(m68k_post_load);
876	}
877
878	#endif /* M68K_COMPILE_FOR_MAME */
879
880	/* ======================================================================== */
881	/* ============================== END OF FILE ============================= */
882	/* ======================================================================== */

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