2 /* ======================================================================== */
3 /* ========================= LICENSING & COPYRIGHT ======================== */
4 /* ======================================================================== */
9 * A portable Motorola M680x0 processor emulation engine.
10 * Copyright 1998-2001 Karl Stenerud. All rights reserved.
12 * This code may be freely used for non-commercial purposes as long as this
13 * copyright notice remains unaltered in the source code and any binary files
14 * containing this code in compiled form.
16 * All other lisencing terms must be negotiated with the author
19 * The latest version of this code can be obtained at:
20 * http://kstenerud.cjb.net
26 #ifndef M68KCPU__HEADER
27 #define M68KCPU__HEADER
32 #if M68K_EMULATE_ADDRESS_ERROR
34 #endif /* M68K_EMULATE_ADDRESS_ERROR */
36 /* ======================================================================== */
37 /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */
38 /* ======================================================================== */
40 /* Check for > 32bit sizes */
41 #if UINT_MAX > 0xffffffff
42 #define M68K_INT_GT_32_BIT 1
45 /* Data types used in this emulation core */
57 #define sint8 signed char /* ASG: changed from char to signed char */
58 #define sint16 signed short
59 #define sint32 signed long
60 #define uint8 unsigned char
61 #define uint16 unsigned short
62 #define uint32 unsigned long
64 /* signed and unsigned int must be at least 32 bits wide */
65 #define sint signed int
66 #define uint unsigned int
70 #define sint64 signed long long
71 #define uint64 unsigned long long
75 #endif /* M68K_USE_64_BIT */
79 /* Allow for architectures that don't have 8-bit sizes */
81 #define MAKE_INT_8(A) (sint8)(A)
84 #define sint8 signed int
86 #define uint8 unsigned int
87 INLINE sint MAKE_INT_8(uint value)
89 return (value & 0x80) ? value | ~0xff : value & 0xff;
91 #endif /* UCHAR_MAX == 0xff */
94 /* Allow for architectures that don't have 16-bit sizes */
95 #if USHRT_MAX == 0xffff
96 #define MAKE_INT_16(A) (sint16)(A)
99 #define sint16 signed int
101 #define uint16 unsigned int
102 INLINE sint MAKE_INT_16(uint value)
104 return (value & 0x8000) ? value | ~0xffff : value & 0xffff;
106 #endif /* USHRT_MAX == 0xffff */
109 /* Allow for architectures that don't have 32-bit sizes */
110 #if ULONG_MAX == 0xffffffff
111 #define MAKE_INT_32(A) (sint32)(A)
114 #define sint32 signed int
116 #define uint32 unsigned int
117 INLINE sint MAKE_INT_32(uint value)
119 return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff;
121 #endif /* ULONG_MAX == 0xffffffff */
126 /* ======================================================================== */
127 /* ============================ GENERAL DEFINES =========================== */
128 /* ======================================================================== */
130 /* Exception Vectors handled by emulation */
131 #define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */
132 #define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */
133 #define EXCEPTION_ILLEGAL_INSTRUCTION 4
134 #define EXCEPTION_ZERO_DIVIDE 5
135 #define EXCEPTION_CHK 6
136 #define EXCEPTION_TRAPV 7
137 #define EXCEPTION_PRIVILEGE_VIOLATION 8
138 #define EXCEPTION_TRACE 9
139 #define EXCEPTION_1010 10
140 #define EXCEPTION_1111 11
141 #define EXCEPTION_FORMAT_ERROR 14
142 #define EXCEPTION_UNINITIALIZED_INTERRUPT 15
143 #define EXCEPTION_SPURIOUS_INTERRUPT 24
144 #define EXCEPTION_INTERRUPT_AUTOVECTOR 24
145 #define EXCEPTION_TRAP_BASE 32
147 /* Function codes set by CPU during data/address bus activity */
148 #define FUNCTION_CODE_USER_DATA 1
149 #define FUNCTION_CODE_USER_PROGRAM 2
150 #define FUNCTION_CODE_SUPERVISOR_DATA 5
151 #define FUNCTION_CODE_SUPERVISOR_PROGRAM 6
152 #define FUNCTION_CODE_CPU_SPACE 7
154 /* CPU types for deciding what to emulate */
155 #define CPU_TYPE_000 1
156 #define CPU_TYPE_010 2
157 #define CPU_TYPE_EC020 4
158 #define CPU_TYPE_020 8
160 /* Different ways to stop the CPU */
161 #define STOP_LEVEL_STOP 1
162 #define STOP_LEVEL_HALT 2
165 #define NULL ((void*)0)
168 /* ======================================================================== */
169 /* ================================ MACROS ================================ */
170 /* ======================================================================== */
173 /* ---------------------------- General Macros ---------------------------- */
175 /* Bit Isolation Macros */
176 #define BIT_0(A) ((A) & 0x00000001)
177 #define BIT_1(A) ((A) & 0x00000002)
178 #define BIT_2(A) ((A) & 0x00000004)
179 #define BIT_3(A) ((A) & 0x00000008)
180 #define BIT_4(A) ((A) & 0x00000010)
181 #define BIT_5(A) ((A) & 0x00000020)
182 #define BIT_6(A) ((A) & 0x00000040)
183 #define BIT_7(A) ((A) & 0x00000080)
184 #define BIT_8(A) ((A) & 0x00000100)
185 #define BIT_9(A) ((A) & 0x00000200)
186 #define BIT_A(A) ((A) & 0x00000400)
187 #define BIT_B(A) ((A) & 0x00000800)
188 #define BIT_C(A) ((A) & 0x00001000)
189 #define BIT_D(A) ((A) & 0x00002000)
190 #define BIT_E(A) ((A) & 0x00004000)
191 #define BIT_F(A) ((A) & 0x00008000)
192 #define BIT_10(A) ((A) & 0x00010000)
193 #define BIT_11(A) ((A) & 0x00020000)
194 #define BIT_12(A) ((A) & 0x00040000)
195 #define BIT_13(A) ((A) & 0x00080000)
196 #define BIT_14(A) ((A) & 0x00100000)
197 #define BIT_15(A) ((A) & 0x00200000)
198 #define BIT_16(A) ((A) & 0x00400000)
199 #define BIT_17(A) ((A) & 0x00800000)
200 #define BIT_18(A) ((A) & 0x01000000)
201 #define BIT_19(A) ((A) & 0x02000000)
202 #define BIT_1A(A) ((A) & 0x04000000)
203 #define BIT_1B(A) ((A) & 0x08000000)
204 #define BIT_1C(A) ((A) & 0x10000000)
205 #define BIT_1D(A) ((A) & 0x20000000)
206 #define BIT_1E(A) ((A) & 0x40000000)
207 #define BIT_1F(A) ((A) & 0x80000000)
209 /* Get the most significant bit for specific sizes */
210 #define GET_MSB_8(A) ((A) & 0x80)
211 #define GET_MSB_9(A) ((A) & 0x100)
212 #define GET_MSB_16(A) ((A) & 0x8000)
213 #define GET_MSB_17(A) ((A) & 0x10000)
214 #define GET_MSB_32(A) ((A) & 0x80000000)
216 #define GET_MSB_33(A) ((A) & 0x100000000)
217 #endif /* M68K_USE_64_BIT */
219 /* Isolate nibbles */
220 #define LOW_NIBBLE(A) ((A) & 0x0f)
221 #define HIGH_NIBBLE(A) ((A) & 0xf0)
223 /* These are used to isolate 8, 16, and 32 bit sizes */
224 #define MASK_OUT_ABOVE_2(A) ((A) & 3)
225 #define MASK_OUT_ABOVE_8(A) ((A) & 0xff)
226 #define MASK_OUT_ABOVE_16(A) ((A) & 0xffff)
227 #define MASK_OUT_BELOW_2(A) ((A) & ~3)
228 #define MASK_OUT_BELOW_8(A) ((A) & ~0xff)
229 #define MASK_OUT_BELOW_16(A) ((A) & ~0xffff)
231 /* No need to mask if we are 32 bit */
232 #if M68K_INT_GT_32BIT || M68K_USE_64_BIT
233 #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff)
234 #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff)
236 #define MASK_OUT_ABOVE_32(A) (A)
237 #define MASK_OUT_BELOW_32(A) 0
238 #endif /* M68K_INT_GT_32BIT || M68K_USE_64_BIT */
240 /* Simulate address lines of 68k family */
241 #define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK)
244 /* Shift & Rotate Macros. */
245 #define LSL(A, C) ((A) << (C))
246 #define LSR(A, C) ((A) >> (C))
248 /* Some > 32-bit optimizations */
249 #if M68K_INT_GT_32BIT
250 /* Shift left and right */
251 #define LSR_32(A, C) ((A) >> (C))
252 #define LSL_32(A, C) ((A) << (C))
254 /* We have to do this because the morons at ANSI decided that shifts
255 * by >= data size are undefined.
257 #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0)
258 #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0)
259 #endif /* M68K_INT_GT_32BIT */
262 #define LSL_32_64(A, C) ((A) << (C))
263 #define LSR_32_64(A, C) ((A) >> (C))
264 #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C)))
265 #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C)))
266 #endif /* M68K_USE_64_BIT */
268 #define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C)))
269 #define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C)))
270 #define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C)))
271 #define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C)))
272 #define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C)))
273 #define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C)))
275 #define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C)))
276 #define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C)))
277 #define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C)))
278 #define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C)))
279 #define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C)))
280 #define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C)))
284 /* ------------------------------ CPU Access ------------------------------ */
286 /* Access the CPU registers */
287 #define CPU_TYPE m68ki_cpu.cpu_type
289 #define REG_DA m68ki_cpu.dar /* easy access to data and address regs */
290 #define REG_D m68ki_cpu.dar
291 #define REG_A (m68ki_cpu.dar+8)
292 #define REG_PPC m68ki_cpu.ppc
293 #define REG_PC m68ki_cpu.pc
294 #define REG_SP_BASE m68ki_cpu.sp
295 #define REG_USP m68ki_cpu.sp[0]
296 #define REG_ISP m68ki_cpu.sp[4]
297 #define REG_MSP m68ki_cpu.sp[6]
298 #define REG_SP m68ki_cpu.dar[15]
299 #define REG_VBR m68ki_cpu.vbr
300 #define REG_SFC m68ki_cpu.sfc
301 #define REG_DFC m68ki_cpu.dfc
302 #define REG_CACR m68ki_cpu.cacr
303 #define REG_CAAR m68ki_cpu.caar
304 #define REG_IR m68ki_cpu.ir
306 #define FLAG_T1 m68ki_cpu.t1_flag
307 #define FLAG_T0 m68ki_cpu.t0_flag
308 #define FLAG_S m68ki_cpu.s_flag
309 #define FLAG_M m68ki_cpu.m_flag
310 #define FLAG_X m68ki_cpu.x_flag
311 #define FLAG_N m68ki_cpu.n_flag
312 #define FLAG_Z m68ki_cpu.not_z_flag
313 #define FLAG_V m68ki_cpu.v_flag
314 #define FLAG_C m68ki_cpu.c_flag
315 #define FLAG_INT_MASK m68ki_cpu.int_mask
317 #define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */
318 #define CPU_INT_CYCLES m68ki_cpu.int_cycles /* ASG */
319 #define CPU_STOPPED m68ki_cpu.stopped
320 #define CPU_PREF_ADDR m68ki_cpu.pref_addr
321 #define CPU_PREF_DATA m68ki_cpu.pref_data
322 #define CPU_ADDRESS_MASK m68ki_cpu.address_mask
323 #define CPU_SR_MASK m68ki_cpu.sr_mask
325 #define CYC_INSTRUCTION m68ki_cpu.cyc_instruction
326 #define CYC_EXCEPTION m68ki_cpu.cyc_exception
327 #define CYC_BCC_NOTAKE_B m68ki_cpu.cyc_bcc_notake_b
328 #define CYC_BCC_NOTAKE_W m68ki_cpu.cyc_bcc_notake_w
329 #define CYC_DBCC_F_NOEXP m68ki_cpu.cyc_dbcc_f_noexp
330 #define CYC_DBCC_F_EXP m68ki_cpu.cyc_dbcc_f_exp
331 #define CYC_SCC_R_FALSE m68ki_cpu.cyc_scc_r_false
332 #define CYC_MOVEM_W m68ki_cpu.cyc_movem_w
333 #define CYC_MOVEM_L m68ki_cpu.cyc_movem_l
334 #define CYC_SHIFT m68ki_cpu.cyc_shift
335 #define CYC_RESET m68ki_cpu.cyc_reset
338 #define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback
339 #define CALLBACK_BKPT_ACK m68ki_cpu.bkpt_ack_callback
340 #define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback
341 #define CALLBACK_PC_CHANGED m68ki_cpu.pc_changed_callback
342 #define CALLBACK_SET_FC m68ki_cpu.set_fc_callback
343 #define CALLBACK_INSTR_HOOK m68ki_cpu.instr_hook_callback
347 /* ----------------------------- Configuration ---------------------------- */
349 /* These defines are dependant on the configuration defines in m68kconf.h */
351 /* Disable certain comparisons if we're not using all CPU types */
353 #define CPU_TYPE_IS_020_PLUS(A) ((A) & CPU_TYPE_020)
354 #define CPU_TYPE_IS_020_LESS(A) 1
356 #define CPU_TYPE_IS_020_PLUS(A) 0
357 #define CPU_TYPE_IS_020_LESS(A) 1
360 #if M68K_EMULATE_EC020
361 #define CPU_TYPE_IS_EC020_PLUS(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
362 #define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010 | CPU_TYPE_EC020))
364 #define CPU_TYPE_IS_EC020_PLUS(A) CPU_TYPE_IS_020_PLUS(A)
365 #define CPU_TYPE_IS_EC020_LESS(A) CPU_TYPE_IS_020_LESS(A)
369 #define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010)
370 #define CPU_TYPE_IS_010_PLUS(A) ((A) & (CPU_TYPE_010 | CPU_TYPE_EC020 | CPU_TYPE_020))
371 #define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010))
373 #define CPU_TYPE_IS_010(A) 0
374 #define CPU_TYPE_IS_010_PLUS(A) CPU_TYPE_IS_EC020_PLUS(A)
375 #define CPU_TYPE_IS_010_LESS(A) CPU_TYPE_IS_EC020_LESS(A)
378 #if M68K_EMULATE_020 || M68K_EMULATE_EC020
379 #define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
381 #define CPU_TYPE_IS_020_VARIANT(A) 0
384 #if M68K_EMULATE_020 || M68K_EMULATE_EC020 || M68K_EMULATE_010
385 #define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000)
387 #define CPU_TYPE_IS_000(A) 1
391 #if !M68K_SEPARATE_READS
392 #define m68k_read_immediate_16(A) m68ki_read_program_16(A)
393 #define m68k_read_immediate_32(A) m68ki_read_program_32(A)
395 #define m68k_read_pcrelative_8(A) m68ki_read_program_8(A)
396 #define m68k_read_pcrelative_16(A) m68ki_read_program_16(A)
397 #define m68k_read_pcrelative_32(A) m68ki_read_program_32(A)
398 #endif /* M68K_SEPARATE_READS */
401 /* Enable or disable callback functions */
402 #if M68K_EMULATE_INT_ACK
403 #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER
404 #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A)
406 #define m68ki_int_ack(A) CALLBACK_INT_ACK(A)
409 /* Default action is to used autovector mode, which is most common */
410 #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR
411 #endif /* M68K_EMULATE_INT_ACK */
413 #if M68K_EMULATE_BKPT_ACK
414 #if M68K_EMULATE_BKPT_ACK == OPT_SPECIFY_HANDLER
415 #define m68ki_bkpt_ack(A) M68K_BKPT_ACK_CALLBACK(A)
417 #define m68ki_bkpt_ack(A) CALLBACK_BKPT_ACK(A)
420 #define m68ki_bkpt_ack(A)
421 #endif /* M68K_EMULATE_BKPT_ACK */
423 #if M68K_EMULATE_RESET
424 #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER
425 #define m68ki_output_reset() M68K_RESET_CALLBACK()
427 #define m68ki_output_reset() CALLBACK_RESET_INSTR()
430 #define m68ki_output_reset()
431 #endif /* M68K_EMULATE_RESET */
433 #if M68K_INSTRUCTION_HOOK
434 #if M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
435 #define m68ki_instr_hook() M68K_INSTRUCTION_CALLBACK()
437 #define m68ki_instr_hook() CALLBACK_INSTR_HOOK()
440 #define m68ki_instr_hook()
441 #endif /* M68K_INSTRUCTION_HOOK */
444 #if M68K_MONITOR_PC == OPT_SPECIFY_HANDLER
445 #define m68ki_pc_changed(A) M68K_SET_PC_CALLBACK(ADDRESS_68K(A))
447 #define m68ki_pc_changed(A) CALLBACK_PC_CHANGED(ADDRESS_68K(A))
450 #define m68ki_pc_changed(A)
451 #endif /* M68K_MONITOR_PC */
454 /* Enable or disable function code emulation */
456 #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER
457 #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A)
459 #define m68ki_set_fc(A) CALLBACK_SET_FC(A)
461 #define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA
462 #define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM
463 #define m68ki_get_address_space() m68ki_address_space
465 #define m68ki_set_fc(A)
466 #define m68ki_use_data_space()
467 #define m68ki_use_program_space()
468 #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA
469 #endif /* M68K_EMULATE_FC */
472 /* Enable or disable trace emulation */
473 #if M68K_EMULATE_TRACE
474 /* Initiates trace checking before each instruction (t1) */
475 #define m68ki_trace_t1() m68ki_tracing = FLAG_T1
476 /* adds t0 to trace checking if we encounter change of flow */
477 #define m68ki_trace_t0() m68ki_tracing |= FLAG_T0
478 /* Clear all tracing */
479 #define m68ki_clear_trace() m68ki_tracing = 0
480 /* Cause a trace exception if we are tracing */
481 #define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace()
483 #define m68ki_trace_t1()
484 #define m68ki_trace_t0()
485 #define m68ki_clear_trace()
486 #define m68ki_exception_if_trace()
487 #endif /* M68K_EMULATE_TRACE */
492 #if M68K_EMULATE_ADDRESS_ERROR
493 extern jmp_buf m68ki_address_error_trap;
494 #define m68ki_set_address_error_trap() if(setjmp(m68ki_address_error_trap)) m68ki_exception_address_error();
495 #define m68ki_check_address_error(A) if((A)&1) longjmp(m68ki_address_error_jump, 1);
497 #define m68ki_set_address_error_trap()
498 #define m68ki_check_address_error(A)
499 #endif /* M68K_ADDRESS_ERROR */
504 extern FILE* M68K_LOG_FILEHANDLE
505 extern char* m68ki_cpu_names[];
507 #define M68K_DO_LOG(A) if(M68K_LOG_FILEHANDLE) fprintf A
508 #if M68K_LOG_1010_1111
509 #define M68K_DO_LOG_EMU(A) if(M68K_LOG_FILEHANDLE) fprintf A
511 #define M68K_DO_LOG_EMU(A)
514 #define M68K_DO_LOG(A)
515 #define M68K_DO_LOG_EMU(A)
520 /* -------------------------- EA / Operand Access ------------------------- */
523 * The general instruction format follows this pattern:
524 * .... XXX. .... .YYY
525 * where XXX is register X and YYY is register Y
527 /* Data Register Isolation */
528 #define DX (REG_D[(REG_IR >> 9) & 7])
529 #define DY (REG_D[REG_IR & 7])
530 /* Address Register Isolation */
531 #define AX (REG_A[(REG_IR >> 9) & 7])
532 #define AY (REG_A[REG_IR & 7])
535 /* Effective Address Calculations */
536 #define EA_AY_AI_8() AY /* address register indirect */
537 #define EA_AY_AI_16() EA_AY_AI_8()
538 #define EA_AY_AI_32() EA_AY_AI_8()
539 #define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */
540 #define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */
541 #define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */
542 #define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */
543 #define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */
544 #define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */
545 #define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */
546 #define EA_AY_DI_16() EA_AY_DI_8()
547 #define EA_AY_DI_32() EA_AY_DI_8()
548 #define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */
549 #define EA_AY_IX_16() EA_AY_IX_8()
550 #define EA_AY_IX_32() EA_AY_IX_8()
552 #define EA_AX_AI_8() AX
553 #define EA_AX_AI_16() EA_AX_AI_8()
554 #define EA_AX_AI_32() EA_AX_AI_8()
555 #define EA_AX_PI_8() (AX++)
556 #define EA_AX_PI_16() ((AX+=2)-2)
557 #define EA_AX_PI_32() ((AX+=4)-4)
558 #define EA_AX_PD_8() (--AX)
559 #define EA_AX_PD_16() (AX-=2)
560 #define EA_AX_PD_32() (AX-=4)
561 #define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16()))
562 #define EA_AX_DI_16() EA_AX_DI_8()
563 #define EA_AX_DI_32() EA_AX_DI_8()
564 #define EA_AX_IX_8() m68ki_get_ea_ix(AX)
565 #define EA_AX_IX_16() EA_AX_IX_8()
566 #define EA_AX_IX_32() EA_AX_IX_8()
568 #define EA_A7_PI_8() ((REG_A[7]+=2)-2)
569 #define EA_A7_PD_8() (REG_A[7]-=2)
571 #define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */
572 #define EA_AW_16() EA_AW_8()
573 #define EA_AW_32() EA_AW_8()
574 #define EA_AL_8() m68ki_read_imm_32() /* absolute long */
575 #define EA_AL_16() EA_AL_8()
576 #define EA_AL_32() EA_AL_8()
577 #define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */
578 #define EA_PCDI_16() EA_PCDI_8()
579 #define EA_PCDI_32() EA_PCDI_8()
580 #define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */
581 #define EA_PCIX_16() EA_PCIX_8()
582 #define EA_PCIX_32() EA_PCIX_8()
585 #define OPER_I_8() m68ki_read_imm_8()
586 #define OPER_I_16() m68ki_read_imm_16()
587 #define OPER_I_32() m68ki_read_imm_32()
591 /* --------------------------- Status Register ---------------------------- */
593 /* Flag Calculation Macros */
594 #define CFLAG_8(A) (A)
595 #define CFLAG_16(A) ((A)>>8)
597 #if M68K_INT_GT_32_BIT
598 #define CFLAG_ADD_32(S, D, R) ((R)>>24)
599 #define CFLAG_SUB_32(S, D, R) ((R)>>24)
601 #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23)
602 #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23)
603 #endif /* M68K_INT_GT_32_BIT */
605 #define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R))
606 #define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8)
607 #define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24)
609 #define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D))
610 #define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8)
611 #define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24)
613 #define NFLAG_8(A) (A)
614 #define NFLAG_16(A) ((A)>>8)
615 #define NFLAG_32(A) ((A)>>24)
616 #define NFLAG_64(A) ((A)>>56)
618 #define ZFLAG_8(A) MASK_OUT_ABOVE_8(A)
619 #define ZFLAG_16(A) MASK_OUT_ABOVE_16(A)
620 #define ZFLAG_32(A) MASK_OUT_ABOVE_32(A)
624 #define NFLAG_SET 0x80
625 #define NFLAG_CLEAR 0
626 #define CFLAG_SET 0x100
627 #define CFLAG_CLEAR 0
628 #define XFLAG_SET 0x100
629 #define XFLAG_CLEAR 0
630 #define VFLAG_SET 0x80
631 #define VFLAG_CLEAR 0
633 #define ZFLAG_CLEAR 0xffffffff
636 #define SFLAG_CLEAR 0
638 #define MFLAG_CLEAR 0
640 /* Turn flag values into 1 or 0 */
641 #define XFLAG_AS_1() ((FLAG_X>>8)&1)
642 #define NFLAG_AS_1() ((FLAG_N>>7)&1)
643 #define VFLAG_AS_1() ((FLAG_V>>7)&1)
644 #define ZFLAG_AS_1() (!FLAG_Z)
645 #define CFLAG_AS_1() ((FLAG_C>>8)&1)
649 #define COND_CS() (FLAG_C&0x100)
650 #define COND_CC() (!COND_CS())
651 #define COND_VS() (FLAG_V&0x80)
652 #define COND_VC() (!COND_VS())
653 #define COND_NE() FLAG_Z
654 #define COND_EQ() (!COND_NE())
655 #define COND_MI() (FLAG_N&0x80)
656 #define COND_PL() (!COND_MI())
657 #define COND_LT() ((FLAG_N^FLAG_V)&0x80)
658 #define COND_GE() (!COND_LT())
659 #define COND_HI() (COND_CC() && COND_NE())
660 #define COND_LS() (COND_CS() || COND_EQ())
661 #define COND_GT() (COND_GE() && COND_NE())
662 #define COND_LE() (COND_LT() || COND_EQ())
664 /* Reversed conditions */
665 #define COND_NOT_CS() COND_CC()
666 #define COND_NOT_CC() COND_CS()
667 #define COND_NOT_VS() COND_VC()
668 #define COND_NOT_VC() COND_VS()
669 #define COND_NOT_NE() COND_EQ()
670 #define COND_NOT_EQ() COND_NE()
671 #define COND_NOT_MI() COND_PL()
672 #define COND_NOT_PL() COND_MI()
673 #define COND_NOT_LT() COND_GE()
674 #define COND_NOT_GE() COND_LT()
675 #define COND_NOT_HI() COND_LS()
676 #define COND_NOT_LS() COND_HI()
677 #define COND_NOT_GT() COND_LE()
678 #define COND_NOT_LE() COND_GT()
680 /* Not real conditions, but here for convenience */
681 #define COND_XS() (FLAG_X&0x100)
682 #define COND_XC() (!COND_XS)
685 /* Get the condition code register */
686 #define m68ki_get_ccr() ((COND_XS() >> 4) | \
692 /* Get the status register */
693 #define m68ki_get_sr() ( FLAG_T1 | \
702 /* ---------------------------- Cycle Counting ---------------------------- */
704 #define ADD_CYCLES(A) m68ki_remaining_cycles += (A)
705 #define USE_CYCLES(A) m68ki_remaining_cycles -= (A)
706 #define SET_CYCLES(A) m68ki_remaining_cycles = A
707 #define GET_CYCLES() m68ki_remaining_cycles
708 #define USE_ALL_CYCLES() m68ki_remaining_cycles = 0
712 /* ----------------------------- Read / Write ----------------------------- */
714 /* Read from the current address space */
715 #define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space())
716 #define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space())
717 #define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space())
719 /* Write to the current data space */
720 #define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
721 #define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
722 #define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
724 /* map read immediate 8 to read immediate 16 */
725 #define m68ki_read_imm_8() MASK_OUT_ABOVE_8(m68ki_read_imm_16())
727 /* Map PC-relative reads */
728 #define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A)
729 #define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A)
730 #define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A)
732 /* Read from the program space */
733 #define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
734 #define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
735 #define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
737 /* Read from the data space */
738 #define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
739 #define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
740 #define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
744 /* ======================================================================== */
745 /* =============================== PROTOTYPES ============================= */
746 /* ======================================================================== */
750 uint cpu_type; /* CPU Type: 68000, 68010, 68EC020, or 68020 */
751 uint dar[16]; /* Data and Address Registers */
752 uint ppc; /* Previous program counter */
753 uint pc; /* Program Counter */
754 uint sp[7]; /* User, Interrupt, and Master Stack Pointers */
755 uint vbr; /* Vector Base Register (m68010+) */
756 uint sfc; /* Source Function Code Register (m68010+) */
757 uint dfc; /* Destination Function Code Register (m68010+) */
758 uint cacr; /* Cache Control Register (m68020, unemulated) */
759 uint caar; /* Cache Address Register (m68020, unemulated) */
760 uint ir; /* Instruction Register */
761 uint t1_flag; /* Trace 1 */
762 uint t0_flag; /* Trace 0 */
763 uint s_flag; /* Supervisor */
764 uint m_flag; /* Master/Interrupt state */
765 uint x_flag; /* Extend */
766 uint n_flag; /* Negative */
767 uint not_z_flag; /* Zero, inverted for speedups */
768 uint v_flag; /* Overflow */
769 uint c_flag; /* Carry */
770 uint int_mask; /* I0-I2 */
771 uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */
772 uint int_cycles; /* ASG: extra cycles from generated interrupts */
773 uint stopped; /* Stopped state */
774 uint pref_addr; /* Last prefetch address */
775 uint pref_data; /* Data in the prefetch queue */
776 uint address_mask; /* Available address pins */
777 uint sr_mask; /* Implemented status register bits */
779 /* Clocks required for instructions / exceptions */
780 uint cyc_bcc_notake_b;
781 uint cyc_bcc_notake_w;
782 uint cyc_dbcc_f_noexp;
784 uint cyc_scc_r_false;
789 uint8* cyc_instruction;
790 uint8* cyc_exception;
792 /* Callbacks to host */
793 int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
794 void (*bkpt_ack_callback)(unsigned int data); /* Breakpoint Acknowledge */
795 void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
796 void (*pc_changed_callback)(unsigned int new_pc); /* Called when the PC changes by a large amount */
797 void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */
798 void (*instr_hook_callback)(void); /* Called every instruction cycle prior to execution */
803 extern m68ki_cpu_core m68ki_cpu;
804 extern sint m68ki_remaining_cycles;
805 extern uint m68ki_tracing;
806 extern uint8 m68ki_shift_8_table[];
807 extern uint16 m68ki_shift_16_table[];
808 extern uint m68ki_shift_32_table[];
809 extern uint8 m68ki_exception_cycle_table[][256];
810 extern uint m68ki_address_space;
811 extern uint8 m68ki_ea_idx_cycle_table[];
814 /* Read data immediately after the program counter */
815 INLINE uint m68ki_read_imm_16(void);
816 INLINE uint m68ki_read_imm_32(void);
818 /* Read data with specific function code */
819 INLINE uint m68ki_read_8_fc (uint address, uint fc);
820 INLINE uint m68ki_read_16_fc (uint address, uint fc);
821 INLINE uint m68ki_read_32_fc (uint address, uint fc);
823 /* Write data with specific function code */
824 INLINE void m68ki_write_8_fc (uint address, uint fc, uint value);
825 INLINE void m68ki_write_16_fc(uint address, uint fc, uint value);
826 INLINE void m68ki_write_32_fc(uint address, uint fc, uint value);
828 /* Indexed and PC-relative ea fetching */
829 INLINE uint m68ki_get_ea_pcdi(void);
830 INLINE uint m68ki_get_ea_pcix(void);
831 INLINE uint m68ki_get_ea_ix(uint An);
833 /* Operand fetching */
834 INLINE uint OPER_AY_AI_8(void);
835 INLINE uint OPER_AY_AI_16(void);
836 INLINE uint OPER_AY_AI_32(void);
837 INLINE uint OPER_AY_PI_8(void);
838 INLINE uint OPER_AY_PI_16(void);
839 INLINE uint OPER_AY_PI_32(void);
840 INLINE uint OPER_AY_PD_8(void);
841 INLINE uint OPER_AY_PD_16(void);
842 INLINE uint OPER_AY_PD_32(void);
843 INLINE uint OPER_AY_DI_8(void);
844 INLINE uint OPER_AY_DI_16(void);
845 INLINE uint OPER_AY_DI_32(void);
846 INLINE uint OPER_AY_IX_8(void);
847 INLINE uint OPER_AY_IX_16(void);
848 INLINE uint OPER_AY_IX_32(void);
850 INLINE uint OPER_AX_AI_8(void);
851 INLINE uint OPER_AX_AI_16(void);
852 INLINE uint OPER_AX_AI_32(void);
853 INLINE uint OPER_AX_PI_8(void);
854 INLINE uint OPER_AX_PI_16(void);
855 INLINE uint OPER_AX_PI_32(void);
856 INLINE uint OPER_AX_PD_8(void);
857 INLINE uint OPER_AX_PD_16(void);
858 INLINE uint OPER_AX_PD_32(void);
859 INLINE uint OPER_AX_DI_8(void);
860 INLINE uint OPER_AX_DI_16(void);
861 INLINE uint OPER_AX_DI_32(void);
862 INLINE uint OPER_AX_IX_8(void);
863 INLINE uint OPER_AX_IX_16(void);
864 INLINE uint OPER_AX_IX_32(void);
866 INLINE uint OPER_A7_PI_8(void);
867 INLINE uint OPER_A7_PD_8(void);
869 INLINE uint OPER_AW_8(void);
870 INLINE uint OPER_AW_16(void);
871 INLINE uint OPER_AW_32(void);
872 INLINE uint OPER_AL_8(void);
873 INLINE uint OPER_AL_16(void);
874 INLINE uint OPER_AL_32(void);
875 INLINE uint OPER_PCDI_8(void);
876 INLINE uint OPER_PCDI_16(void);
877 INLINE uint OPER_PCDI_32(void);
878 INLINE uint OPER_PCIX_8(void);
879 INLINE uint OPER_PCIX_16(void);
880 INLINE uint OPER_PCIX_32(void);
882 /* Stack operations */
883 INLINE void m68ki_push_16(uint value);
884 INLINE void m68ki_push_32(uint value);
885 INLINE uint m68ki_pull_16(void);
886 INLINE uint m68ki_pull_32(void);
888 /* Program flow operations */
889 INLINE void m68ki_jump(uint new_pc);
890 INLINE void m68ki_jump_vector(uint vector);
891 INLINE void m68ki_branch_8(uint offset);
892 INLINE void m68ki_branch_16(uint offset);
893 INLINE void m68ki_branch_32(uint offset);
895 /* Status register operations. */
896 INLINE void m68ki_set_s_flag(uint value); /* Only bit 2 of value should be set (i.e. 4 or 0) */
897 INLINE void m68ki_set_sm_flag(uint value); /* only bits 1 and 2 of value should be set */
898 INLINE void m68ki_set_ccr(uint value); /* set the condition code register */
899 INLINE void m68ki_set_sr(uint value); /* set the status register */
900 INLINE void m68ki_set_sr_noint(uint value); /* set the status register */
902 /* Exception processing */
903 INLINE uint m68ki_init_exception(void); /* Initial exception processing */
905 INLINE void m68ki_stack_frame_3word(uint pc, uint sr); /* Stack various frame types */
906 INLINE void m68ki_stack_frame_buserr(uint pc, uint sr, uint address, uint write, uint instruction, uint fc);
908 INLINE void m68ki_stack_frame_0000(uint pc, uint sr, uint vector);
909 INLINE void m68ki_stack_frame_0001(uint pc, uint sr, uint vector);
910 INLINE void m68ki_stack_frame_0010(uint sr, uint vector);
911 INLINE void m68ki_stack_frame_1000(uint pc, uint sr, uint vector);
912 INLINE void m68ki_stack_frame_1010(uint sr, uint vector, uint pc);
913 INLINE void m68ki_stack_frame_1011(uint sr, uint vector, uint pc);
915 INLINE void m68ki_exception_trap(uint vector);
916 INLINE void m68ki_exception_trapN(uint vector);
917 INLINE void m68ki_exception_trace(void);
918 INLINE void m68ki_exception_privilege_violation(void);
919 INLINE void m68ki_exception_1010(void);
920 INLINE void m68ki_exception_1111(void);
921 INLINE void m68ki_exception_illegal(void);
922 INLINE void m68ki_exception_format_error(void);
923 INLINE void m68ki_exception_address_error(void);
924 INLINE void m68ki_exception_interrupt(uint int_level);
925 INLINE void m68ki_check_interrupts(void); /* ASG: check for interrupts */
927 /* quick disassembly (used for logging) */
928 char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type);
931 /* ======================================================================== */
932 /* =========================== UTILITY FUNCTIONS ========================== */
933 /* ======================================================================== */
936 /* ---------------------------- Read Immediate ---------------------------- */
938 /* Handles all immediate reads, does address error check, function code setting,
939 * and prefetching if they are enabled in m68kconf.h
941 INLINE uint m68ki_read_imm_16(void)
943 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
944 m68ki_check_address_error(REG_PC); /* auto-disable (see m68kcpu.h) */
945 #if M68K_EMULATE_PREFETCH
946 if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR)
948 CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC);
949 CPU_PREF_DATA = m68k_read_immediate_32(ADDRESS_68K(CPU_PREF_ADDR));
952 return MASK_OUT_ABOVE_16(CPU_PREF_DATA >> ((2-((REG_PC-2)&2))<<3));
955 return m68k_read_immediate_16(ADDRESS_68K(REG_PC-2));
956 #endif /* M68K_EMULATE_PREFETCH */
958 INLINE uint m68ki_read_imm_32(void)
960 #if M68K_EMULATE_PREFETCH
963 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
964 m68ki_check_address_error(REG_PC); /* auto-disable (see m68kcpu.h) */
965 if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR)
967 CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC);
968 CPU_PREF_DATA = m68k_read_immediate_32(ADDRESS_68K(CPU_PREF_ADDR));
970 temp_val = CPU_PREF_DATA;
972 if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR)
974 CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC);
975 CPU_PREF_DATA = m68k_read_immediate_32(ADDRESS_68K(CPU_PREF_ADDR));
976 temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | (CPU_PREF_DATA >> 16));
982 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
983 m68ki_check_address_error(REG_PC); /* auto-disable (see m68kcpu.h) */
985 return m68k_read_immediate_32(ADDRESS_68K(REG_PC-4));
986 #endif /* M68K_EMULATE_PREFETCH */
991 /* ------------------------- Top level read/write ------------------------- */
993 /* Handles all memory accesses (except for immediate reads if they are
994 * configured to use separate functions in m68kconf.h).
995 * All memory accesses must go through these top level functions.
996 * These functions will also check for address error and set the function
997 * code if they are enabled in m68kconf.h.
999 INLINE uint m68ki_read_8_fc(uint address, uint fc)
1001 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1002 return m68k_read_memory_8(ADDRESS_68K(address));
1004 INLINE uint m68ki_read_16_fc(uint address, uint fc)
1006 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1007 m68ki_check_address_error(address); /* auto-disable (see m68kcpu.h) */
1008 return m68k_read_memory_16(ADDRESS_68K(address));
1010 INLINE uint m68ki_read_32_fc(uint address, uint fc)
1012 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1013 m68ki_check_address_error(address); /* auto-disable (see m68kcpu.h) */
1014 return m68k_read_memory_32(ADDRESS_68K(address));
1017 INLINE void m68ki_write_8_fc(uint address, uint fc, uint value)
1019 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1020 m68k_write_memory_8(ADDRESS_68K(address), value);
1022 INLINE void m68ki_write_16_fc(uint address, uint fc, uint value)
1024 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1025 m68ki_check_address_error(address); /* auto-disable (see m68kcpu.h) */
1026 m68k_write_memory_16(ADDRESS_68K(address), value);
1028 INLINE void m68ki_write_32_fc(uint address, uint fc, uint value)
1030 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1031 m68ki_check_address_error(address); /* auto-disable (see m68kcpu.h) */
1032 m68k_write_memory_32(ADDRESS_68K(address), value);
1037 /* --------------------- Effective Address Calculation -------------------- */
1039 /* The program counter relative addressing modes cause operands to be
1040 * retrieved from program space, not data space.
1042 INLINE uint m68ki_get_ea_pcdi(void)
1044 uint old_pc = REG_PC;
1045 m68ki_use_program_space(); /* auto-disable */
1046 return old_pc + MAKE_INT_16(m68ki_read_imm_16());
1050 INLINE uint m68ki_get_ea_pcix(void)
1052 m68ki_use_program_space(); /* auto-disable */
1053 return m68ki_get_ea_ix(REG_PC);
1056 /* Indexed addressing modes are encoded as follows:
1058 * Base instruction format:
1059 * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0
1060 * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An)
1062 * Base instruction format for destination EA in move instructions:
1063 * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0
1064 * x x x x | BASE REG | 1 1 0 | X X X X X X (An)
1066 * Brief extension format:
1067 * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0
1068 * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT
1070 * Full extension format:
1071 * F E D C B A 9 8 7 6 5 4 3 2 1 0
1072 * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS
1073 * BASE DISPLACEMENT (0, 16, 32 bit) (bd)
1074 * OUTER DISPLACEMENT (0, 16, 32 bit) (od)
1076 * D/A: 0 = Dn, 1 = An (Xn)
1077 * W/L: 0 = W (sign extend), 1 = L (.SIZE)
1078 * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE)
1079 * BS: 0=add base reg, 1=suppress base reg (An suppressed)
1080 * IS: 0=add index, 1=suppress index (Xn suppressed)
1081 * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd)
1084 * 0 000 No Memory Indirect
1085 * 0 001 indir prex with null outer
1086 * 0 010 indir prex with word outer
1087 * 0 011 indir prex with long outer
1089 * 0 101 indir postx with null outer
1090 * 0 110 indir postx with word outer
1091 * 0 111 indir postx with long outer
1092 * 1 000 no memory indirect
1093 * 1 001 mem indir with null outer
1094 * 1 010 mem indir with word outer
1095 * 1 011 mem indir with long outer
1096 * 1 100-111 reserved
1098 INLINE uint m68ki_get_ea_ix(uint An)
1100 /* An = base register */
1101 uint extension = m68ki_read_imm_16();
1102 uint Xn = 0; /* Index register */
1103 uint bd = 0; /* Base Displacement */
1104 uint od = 0; /* Outer Displacement */
1106 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1108 /* Calculate index */
1109 Xn = REG_DA[extension>>12]; /* Xn */
1110 if(!BIT_B(extension)) /* W/L */
1111 Xn = MAKE_INT_16(Xn);
1113 /* Add base register and displacement and return */
1114 return An + Xn + MAKE_INT_8(extension);
1117 /* Brief extension format */
1118 if(!BIT_8(extension))
1120 /* Calculate index */
1121 Xn = REG_DA[extension>>12]; /* Xn */
1122 if(!BIT_B(extension)) /* W/L */
1123 Xn = MAKE_INT_16(Xn);
1124 /* Add scale if proper CPU type */
1125 if(CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
1126 Xn <<= (extension>>9) & 3; /* SCALE */
1128 /* Add base register and displacement and return */
1129 return An + Xn + MAKE_INT_8(extension);
1132 /* Full extension format */
1134 USE_CYCLES(m68ki_ea_idx_cycle_table[extension&0x3f]);
1136 /* Check if base register is present */
1137 if(BIT_7(extension)) /* BS */
1140 /* Check if index is present */
1141 if(!BIT_6(extension)) /* IS */
1143 Xn = REG_DA[extension>>12]; /* Xn */
1144 if(!BIT_B(extension)) /* W/L */
1145 Xn = MAKE_INT_16(Xn);
1146 Xn <<= (extension>>9) & 3; /* SCALE */
1149 /* Check if base displacement is present */
1150 if(BIT_5(extension)) /* BD SIZE */
1151 bd = BIT_4(extension) ? m68ki_read_imm_32() : MAKE_INT_16(m68ki_read_imm_16());
1153 /* If no indirect action, we are done */
1154 if(!(extension&7)) /* No Memory Indirect */
1155 return An + bd + Xn;
1157 /* Check if outer displacement is present */
1158 if(BIT_1(extension)) /* I/IS: od */
1159 od = BIT_0(extension) ? m68ki_read_imm_32() : MAKE_INT_16(m68ki_read_imm_16());
1162 if(BIT_2(extension)) /* I/IS: 0 = preindex, 1 = postindex */
1163 return m68ki_read_32(An + bd) + Xn + od;
1166 return m68ki_read_32(An + bd + Xn) + od;
1170 /* Fetch operands */
1171 INLINE uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); }
1172 INLINE uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);}
1173 INLINE uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);}
1174 INLINE uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); }
1175 INLINE uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);}
1176 INLINE uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);}
1177 INLINE uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); }
1178 INLINE uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);}
1179 INLINE uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);}
1180 INLINE uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); }
1181 INLINE uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);}
1182 INLINE uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);}
1183 INLINE uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); }
1184 INLINE uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);}
1185 INLINE uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);}
1187 INLINE uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); }
1188 INLINE uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);}
1189 INLINE uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);}
1190 INLINE uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); }
1191 INLINE uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);}
1192 INLINE uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);}
1193 INLINE uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); }
1194 INLINE uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);}
1195 INLINE uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);}
1196 INLINE uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); }
1197 INLINE uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);}
1198 INLINE uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);}
1199 INLINE uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); }
1200 INLINE uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);}
1201 INLINE uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);}
1203 INLINE uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); }
1204 INLINE uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); }
1206 INLINE uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); }
1207 INLINE uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);}
1208 INLINE uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);}
1209 INLINE uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); }
1210 INLINE uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);}
1211 INLINE uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);}
1212 INLINE uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); }
1213 INLINE uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);}
1214 INLINE uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);}
1215 INLINE uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); }
1216 INLINE uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);}
1217 INLINE uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);}
1221 /* ---------------------------- Stack Functions --------------------------- */
1223 /* Push/pull data from the stack */
1224 INLINE void m68ki_push_16(uint value)
1226 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1227 m68ki_write_16(REG_SP, value);
1230 INLINE void m68ki_push_32(uint value)
1232 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1233 m68ki_write_32(REG_SP, value);
1236 INLINE uint m68ki_pull_16(void)
1238 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1239 return m68ki_read_16(REG_SP-2);
1242 INLINE uint m68ki_pull_32(void)
1244 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1245 return m68ki_read_32(REG_SP-4);
1249 /* Increment/decrement the stack as if doing a push/pull but
1250 * don't do any memory access.
1252 INLINE void m68ki_fake_push_16(void)
1254 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1257 INLINE void m68ki_fake_push_32(void)
1259 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1262 INLINE void m68ki_fake_pull_16(void)
1264 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1267 INLINE void m68ki_fake_pull_32(void)
1269 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1273 /* ----------------------------- Program Flow ----------------------------- */
1275 /* Jump to a new program location or vector.
1276 * These functions will also call the pc_changed callback if it was enabled
1279 INLINE void m68ki_jump(uint new_pc)
1282 m68ki_pc_changed(REG_PC);
1285 INLINE void m68ki_jump_vector(uint vector)
1287 REG_PC = (vector<<2) + REG_VBR;
1288 REG_PC = m68ki_read_data_32(REG_PC);
1289 m68ki_pc_changed(REG_PC);
1293 /* Branch to a new memory location.
1294 * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h.
1295 * So far I've found no problems with not calling pc_changed for 8 or 16
1298 INLINE void m68ki_branch_8(uint offset)
1300 REG_PC += MAKE_INT_8(offset);
1303 INLINE void m68ki_branch_16(uint offset)
1305 REG_PC += MAKE_INT_16(offset);
1308 INLINE void m68ki_branch_32(uint offset)
1311 m68ki_pc_changed(REG_PC);
1316 /* ---------------------------- Status Register --------------------------- */
1318 /* Set the S flag and change the active stack pointer.
1319 * Note that value MUST be 4 or 0.
1321 INLINE void m68ki_set_s_flag(uint value)
1323 /* Backup the old stack pointer */
1324 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1325 /* Set the S flag */
1327 /* Set the new stack pointer */
1328 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1331 /* Set the S and M flags and change the active stack pointer.
1332 * Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
1334 INLINE void m68ki_set_sm_flag(uint value)
1336 /* Backup the old stack pointer */
1337 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1338 /* Set the S and M flags */
1339 FLAG_S = value & SFLAG_SET;
1340 FLAG_M = value & MFLAG_SET;
1341 /* Set the new stack pointer */
1342 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1346 /* Set the condition code register */
1347 INLINE void m68ki_set_ccr(uint value)
1349 FLAG_X = BIT_4(value) << 4;
1350 FLAG_N = BIT_3(value) << 4;
1351 FLAG_Z = !BIT_2(value);
1352 FLAG_V = BIT_1(value) << 6;
1353 FLAG_C = BIT_0(value) << 8;
1356 /* Set the status register but don't check for interrupts */
1357 INLINE void m68ki_set_sr_noint(uint value)
1359 /* Mask out the "unimplemented" bits */
1360 value &= CPU_SR_MASK;
1362 /* Now set the status register */
1363 FLAG_T1 = BIT_F(value);
1364 FLAG_T0 = BIT_E(value);
1365 FLAG_INT_MASK = value & 0x0700;
1366 m68ki_set_ccr(value);
1367 m68ki_set_sm_flag((value >> 11) & 6);
1370 /* Set the status register and check for interrupts */
1371 INLINE void m68ki_set_sr(uint value)
1373 m68ki_set_sr_noint(value);
1374 m68ki_check_interrupts();
1378 /* ------------------------- Exception Processing ------------------------- */
1380 /* Initiate exception processing */
1381 INLINE uint m68ki_init_exception(void)
1383 /* Save the old status register */
1384 uint sr = m68ki_get_sr();
1386 /* Turn off trace flag, clear pending traces */
1387 FLAG_T1 = FLAG_T0 = 0;
1388 m68ki_clear_trace();
1389 /* Enter supervisor mode */
1390 m68ki_set_s_flag(SFLAG_SET);
1395 /* 3 word stack frame (68000 only) */
1396 INLINE void m68ki_stack_frame_3word(uint pc, uint sr)
1402 /* Format 0 stack frame.
1403 * This is the standard stack frame for 68010+.
1405 INLINE void m68ki_stack_frame_0000(uint pc, uint sr, uint vector)
1407 /* Stack a 3-word frame if we are 68000 */
1408 if(CPU_TYPE == CPU_TYPE_000)
1410 m68ki_stack_frame_3word(pc, sr);
1413 m68ki_push_16(vector<<2);
1418 /* Format 1 stack frame (68020).
1419 * For 68020, this is the 4 word throwaway frame.
1421 INLINE void m68ki_stack_frame_0001(uint pc, uint sr, uint vector)
1423 m68ki_push_16(0x1000 | (vector<<2));
1428 /* Format 2 stack frame.
1429 * This is used only by 68020 for trap exceptions.
1431 INLINE void m68ki_stack_frame_0010(uint sr, uint vector)
1433 m68ki_push_32(REG_PPC);
1434 m68ki_push_16(0x2000 | (vector<<2));
1435 m68ki_push_32(REG_PC);
1440 /* Bus error stack frame (68000 only).
1442 INLINE void m68ki_stack_frame_buserr(uint pc, uint sr, uint address, uint write, uint instruction, uint fc)
1446 m68ki_push_16(REG_IR);
1447 m68ki_push_32(address); /* access address */
1448 /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC
1449 * R/W 0 = write, 1 = read
1450 * I/N 0 = instruction, 1 = not
1451 * FC 3-bit function code
1453 m68ki_push_16(((!write)<<4) | ((!instruction)<<3) | fc);
1456 /* Format 8 stack frame (68010).
1457 * 68010 only. This is the 29 word bus/address error frame.
1459 void m68ki_stack_frame_1000(uint pc, uint sr, uint vector)
1463 * INTERNAL INFORMATION, 16 WORDS
1465 m68ki_fake_push_32();
1466 m68ki_fake_push_32();
1467 m68ki_fake_push_32();
1468 m68ki_fake_push_32();
1469 m68ki_fake_push_32();
1470 m68ki_fake_push_32();
1471 m68ki_fake_push_32();
1472 m68ki_fake_push_32();
1474 /* INSTRUCTION INPUT BUFFER */
1477 /* UNUSED, RESERVED (not written) */
1478 m68ki_fake_push_16();
1480 /* DATA INPUT BUFFER */
1483 /* UNUSED, RESERVED (not written) */
1484 m68ki_fake_push_16();
1486 /* DATA OUTPUT BUFFER */
1489 /* UNUSED, RESERVED (not written) */
1490 m68ki_fake_push_16();
1495 /* SPECIAL STATUS WORD */
1498 /* 1000, VECTOR OFFSET */
1499 m68ki_push_16(0x8000 | (vector<<2));
1501 /* PROGRAM COUNTER */
1504 /* STATUS REGISTER */
1508 /* Format A stack frame (short bus fault).
1509 * This is used only by 68020 for bus fault and address error
1510 * if the error happens at an instruction boundary.
1511 * PC stacked is address of next instruction.
1513 void m68ki_stack_frame_1010(uint sr, uint vector, uint pc)
1515 /* INTERNAL REGISTER */
1518 /* INTERNAL REGISTER */
1521 /* DATA OUTPUT BUFFER (2 words) */
1524 /* INTERNAL REGISTER */
1527 /* INTERNAL REGISTER */
1530 /* DATA CYCLE FAULT ADDRESS (2 words) */
1533 /* INSTRUCTION PIPE STAGE B */
1536 /* INSTRUCTION PIPE STAGE C */
1539 /* SPECIAL STATUS REGISTER */
1542 /* INTERNAL REGISTER */
1545 /* 1010, VECTOR OFFSET */
1546 m68ki_push_16(0xa000 | (vector<<2));
1548 /* PROGRAM COUNTER */
1551 /* STATUS REGISTER */
1555 /* Format B stack frame (long bus fault).
1556 * This is used only by 68020 for bus fault and address error
1557 * if the error happens during instruction execution.
1558 * PC stacked is address of instruction in progress.
1560 void m68ki_stack_frame_1011(uint sr, uint vector, uint pc)
1562 /* INTERNAL REGISTERS (18 words) */
1573 /* VERSION# (4 bits), INTERNAL INFORMATION */
1576 /* INTERNAL REGISTERS (3 words) */
1580 /* DATA INTPUT BUFFER (2 words) */
1583 /* INTERNAL REGISTERS (2 words) */
1586 /* STAGE B ADDRESS (2 words) */
1589 /* INTERNAL REGISTER (4 words) */
1593 /* DATA OUTPUT BUFFER (2 words) */
1596 /* INTERNAL REGISTER */
1599 /* INTERNAL REGISTER */
1602 /* DATA CYCLE FAULT ADDRESS (2 words) */
1605 /* INSTRUCTION PIPE STAGE B */
1608 /* INSTRUCTION PIPE STAGE C */
1611 /* SPECIAL STATUS REGISTER */
1614 /* INTERNAL REGISTER */
1617 /* 1011, VECTOR OFFSET */
1618 m68ki_push_16(0xb000 | (vector<<2));
1620 /* PROGRAM COUNTER */
1623 /* STATUS REGISTER */
1628 /* Used for Group 2 exceptions.
1629 * These stack a type 2 frame on the 020.
1631 INLINE void m68ki_exception_trap(uint vector)
1633 uint sr = m68ki_init_exception();
1635 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1636 m68ki_stack_frame_0000(REG_PC, sr, vector);
1638 m68ki_stack_frame_0010(sr, vector);
1640 m68ki_jump_vector(vector);
1642 /* Use up some clock cycles */
1643 USE_CYCLES(CYC_EXCEPTION[vector]);
1646 /* Trap#n stacks a 0 frame but behaves like group2 otherwise */
1647 INLINE void m68ki_exception_trapN(uint vector)
1649 uint sr = m68ki_init_exception();
1650 m68ki_stack_frame_0000(REG_PC, sr, vector);
1651 m68ki_jump_vector(vector);
1653 /* Use up some clock cycles */
1654 USE_CYCLES(CYC_EXCEPTION[vector]);
1657 /* Exception for trace mode */
1658 INLINE void m68ki_exception_trace(void)
1660 uint sr = m68ki_init_exception();
1662 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1663 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_TRACE);
1665 m68ki_stack_frame_0010(sr, EXCEPTION_TRACE);
1667 m68ki_jump_vector(EXCEPTION_TRACE);
1669 /* Trace nullifies a STOP instruction */
1670 CPU_STOPPED &= ~STOP_LEVEL_STOP;
1672 /* Use up some clock cycles */
1673 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]);
1676 /* Exception for privilege violation */
1677 INLINE void m68ki_exception_privilege_violation(void)
1679 uint sr = m68ki_init_exception();
1680 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_PRIVILEGE_VIOLATION);
1681 m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION);
1683 /* Use up some clock cycles and undo the instruction's cycles */
1684 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]);
1687 /* Exception for A-Line instructions */
1688 INLINE void m68ki_exception_1010(void)
1691 #if M68K_LOG_1010_1111 == OPT_ON
1692 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1010 instruction %04x (%s)\n",
1693 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1694 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1697 sr = m68ki_init_exception();
1698 m68ki_stack_frame_0000(REG_PC-2, sr, EXCEPTION_1010);
1699 m68ki_jump_vector(EXCEPTION_1010);
1701 /* Use up some clock cycles and undo the instruction's cycles */
1702 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]);
1705 /* Exception for F-Line instructions */
1706 INLINE void m68ki_exception_1111(void)
1710 #if M68K_LOG_1010_1111 == OPT_ON
1711 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1111 instruction %04x (%s)\n",
1712 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1713 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1716 sr = m68ki_init_exception();
1717 m68ki_stack_frame_0000(REG_PC-2, sr, EXCEPTION_1111);
1718 m68ki_jump_vector(EXCEPTION_1111);
1720 /* Use up some clock cycles and undo the instruction's cycles */
1721 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]);
1724 /* Exception for illegal instructions */
1725 INLINE void m68ki_exception_illegal(void)
1729 M68K_DO_LOG((M68K_LOG_FILEHANDLE "%s at %08x: illegal instruction %04x (%s)\n",
1730 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1731 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1733 sr = m68ki_init_exception();
1734 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_ILLEGAL_INSTRUCTION);
1735 m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION);
1737 /* Use up some clock cycles and undo the instruction's cycles */
1738 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]);
1741 /* Exception for format errror in RTE */
1742 INLINE void m68ki_exception_format_error(void)
1744 uint sr = m68ki_init_exception();
1745 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_FORMAT_ERROR);
1746 m68ki_jump_vector(EXCEPTION_FORMAT_ERROR);
1748 /* Use up some clock cycles and undo the instruction's cycles */
1749 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_FORMAT_ERROR] - CYC_INSTRUCTION[REG_IR]);
1752 /* Exception for address error */
1753 INLINE void m68ki_exception_address_error(void)
1755 /* Not emulated yet */
1759 /* Service an interrupt request and start exception processing */
1760 void m68ki_exception_interrupt(uint int_level)
1766 /* Turn off the stopped state */
1767 CPU_STOPPED &= ~STOP_LEVEL_STOP;
1769 /* If we are halted, don't do anything */
1773 /* Acknowledge the interrupt */
1774 vector = m68ki_int_ack(int_level);
1776 /* Get the interrupt vector */
1777 if(vector == M68K_INT_ACK_AUTOVECTOR)
1778 /* Use the autovectors. This is the most commonly used implementation */
1779 vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level;
1780 else if(vector == M68K_INT_ACK_SPURIOUS)
1781 /* Called if no devices respond to the interrupt acknowledge */
1782 vector = EXCEPTION_SPURIOUS_INTERRUPT;
1783 else if(vector > 255)
1785 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: Interrupt acknowledge returned invalid vector $%x\n",
1786 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PC), vector));
1790 /* Start exception processing */
1791 sr = m68ki_init_exception();
1793 /* Set the interrupt mask to the level of the one being serviced */
1794 FLAG_INT_MASK = int_level<<8;
1796 /* Get the new PC */
1797 new_pc = m68ki_read_data_32((vector<<2) + REG_VBR);
1799 /* If vector is uninitialized, call the uninitialized interrupt vector */
1801 new_pc = m68ki_read_data_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2) + REG_VBR);
1803 /* Generate a stack frame */
1804 m68ki_stack_frame_0000(REG_PC, sr, vector);
1805 if(FLAG_M && CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
1807 /* Create throwaway frame */
1808 m68ki_set_sm_flag(FLAG_S); /* clear M */
1809 sr |= 0x2000; /* Same as SR in master stack frame except S is forced high */
1810 m68ki_stack_frame_0001(REG_PC, sr, vector);
1815 /* Defer cycle counting until later */
1816 CPU_INT_CYCLES += CYC_EXCEPTION[vector];
1818 #if !M68K_EMULATE_INT_ACK
1819 /* Automatically clear IRQ if we are not using an acknowledge scheme */
1821 #endif /* M68K_EMULATE_INT_ACK */
1825 /* ASG: Check for interrupts */
1826 INLINE void m68ki_check_interrupts(void)
1828 if(CPU_INT_LEVEL > FLAG_INT_MASK)
1829 m68ki_exception_interrupt(CPU_INT_LEVEL>>8);
1834 /* ======================================================================== */
1835 /* ============================== END OF FILE ============================= */
1836 /* ======================================================================== */
1838 #endif /* M68KCPU__HEADER */