1 /* ======================================================================== */
2 /* ========================= LICENSING & COPYRIGHT ======================== */
3 /* ======================================================================== */
8 * A portable Motorola M680x0 processor emulation engine.
9 * Copyright Karl Stenerud. All rights reserved.
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:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
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
33 #ifndef M68KCPU__HEADER
34 #define M68KCPU__HEADER
47 /* ======================================================================== */
48 /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */
49 /* ======================================================================== */
51 /* Check for > 32bit sizes */
52 #if UINT_MAX > 0xffffffff
53 #define M68K_INT_GT_32_BIT 1
55 #define M68K_INT_GT_32_BIT 0
58 /* Data types used in this emulation core */
70 typedef signed char sint8; /* ASG: changed from char to signed char */
71 typedef signed short sint16;
72 typedef signed int sint32; /* AWJ: changed from long to int */
73 typedef unsigned char uint8;
74 typedef unsigned short uint16;
75 typedef unsigned int uint32; /* AWJ: changed from long to int */
77 /* signed and unsigned int must be at least 32 bits wide */
78 typedef signed int sint;
79 typedef unsigned int uint;
83 typedef signed long long sint64;
84 typedef unsigned long long uint64;
86 typedef sint32 sint64;
87 typedef uint32 uint64;
88 #endif /* M68K_USE_64_BIT */
90 /* U64 and S64 are used to wrap long integer constants. */
92 #define U64(val) val##ULL
93 #define S64(val) val##LL
99 #include "softfloat/milieu.h"
100 #include "softfloat/softfloat.h"
103 /* Allow for architectures that don't have 8-bit sizes */
104 #if UCHAR_MAX == 0xff
105 #define MAKE_INT_8(A) (sint8)(A)
108 #define sint8 signed int
110 #define uint8 unsigned int
111 static inline sint MAKE_INT_8(uint value)
113 return (value & 0x80) ? value | ~0xff : value & 0xff;
115 #endif /* UCHAR_MAX == 0xff */
118 /* Allow for architectures that don't have 16-bit sizes */
119 #if USHRT_MAX == 0xffff
120 #define MAKE_INT_16(A) (sint16)(A)
123 #define sint16 signed int
125 #define uint16 unsigned int
126 static inline sint MAKE_INT_16(uint value)
128 return (value & 0x8000) ? value | ~0xffff : value & 0xffff;
130 #endif /* USHRT_MAX == 0xffff */
133 /* Allow for architectures that don't have 32-bit sizes */
134 #if UINT_MAX == 0xffffffff
135 #define MAKE_INT_32(A) (sint32)(A)
138 #define sint32 signed int
140 #define uint32 unsigned int
141 static inline sint MAKE_INT_32(uint value)
143 return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff;
145 #endif /* UINT_MAX == 0xffffffff */
150 /* ======================================================================== */
151 /* ============================ GENERAL DEFINES =========================== */
152 /* ======================================================================== */
154 /* Exception Vectors handled by emulation */
155 #define EXCEPTION_RESET 0
156 #define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */
157 #define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */
158 #define EXCEPTION_ILLEGAL_INSTRUCTION 4
159 #define EXCEPTION_ZERO_DIVIDE 5
160 #define EXCEPTION_CHK 6
161 #define EXCEPTION_TRAPV 7
162 #define EXCEPTION_PRIVILEGE_VIOLATION 8
163 #define EXCEPTION_TRACE 9
164 #define EXCEPTION_1010 10
165 #define EXCEPTION_1111 11
166 #define EXCEPTION_FORMAT_ERROR 14
167 #define EXCEPTION_UNINITIALIZED_INTERRUPT 15
168 #define EXCEPTION_SPURIOUS_INTERRUPT 24
169 #define EXCEPTION_INTERRUPT_AUTOVECTOR 24
170 #define EXCEPTION_TRAP_BASE 32
172 /* Function codes set by CPU during data/address bus activity */
173 #define FUNCTION_CODE_USER_DATA 1
174 #define FUNCTION_CODE_USER_PROGRAM 2
175 #define FUNCTION_CODE_SUPERVISOR_DATA 5
176 #define FUNCTION_CODE_SUPERVISOR_PROGRAM 6
177 #define FUNCTION_CODE_CPU_SPACE 7
179 /* CPU types for deciding what to emulate */
180 #define CPU_TYPE_000 (0x00000001)
181 #define CPU_TYPE_008 (0x00000002)
182 #define CPU_TYPE_010 (0x00000004)
183 #define CPU_TYPE_EC020 (0x00000008)
184 #define CPU_TYPE_020 (0x00000010)
185 #define CPU_TYPE_EC030 (0x00000020)
186 #define CPU_TYPE_030 (0x00000040)
187 #define CPU_TYPE_EC040 (0x00000080)
188 #define CPU_TYPE_LC040 (0x00000100)
189 #define CPU_TYPE_040 (0x00000200)
190 #define CPU_TYPE_SCC070 (0x00000400)
192 /* Different ways to stop the CPU */
193 #define STOP_LEVEL_STOP 1
194 #define STOP_LEVEL_HALT 2
196 /* Used for 68000 address error processing */
197 #define INSTRUCTION_YES 0
198 #define INSTRUCTION_NO 0x08
199 #define MODE_READ 0x10
202 #define RUN_MODE_NORMAL 0
203 #define RUN_MODE_BERR_AERR_RESET 1
206 #define NULL ((void*)0)
209 /* ======================================================================== */
210 /* ================================ MACROS ================================ */
211 /* ======================================================================== */
214 /* ---------------------------- General Macros ---------------------------- */
216 /* Bit Isolation Macros */
217 #define BIT_0(A) ((A) & 0x00000001)
218 #define BIT_1(A) ((A) & 0x00000002)
219 #define BIT_2(A) ((A) & 0x00000004)
220 #define BIT_3(A) ((A) & 0x00000008)
221 #define BIT_4(A) ((A) & 0x00000010)
222 #define BIT_5(A) ((A) & 0x00000020)
223 #define BIT_6(A) ((A) & 0x00000040)
224 #define BIT_7(A) ((A) & 0x00000080)
225 #define BIT_8(A) ((A) & 0x00000100)
226 #define BIT_9(A) ((A) & 0x00000200)
227 #define BIT_A(A) ((A) & 0x00000400)
228 #define BIT_B(A) ((A) & 0x00000800)
229 #define BIT_C(A) ((A) & 0x00001000)
230 #define BIT_D(A) ((A) & 0x00002000)
231 #define BIT_E(A) ((A) & 0x00004000)
232 #define BIT_F(A) ((A) & 0x00008000)
233 #define BIT_10(A) ((A) & 0x00010000)
234 #define BIT_11(A) ((A) & 0x00020000)
235 #define BIT_12(A) ((A) & 0x00040000)
236 #define BIT_13(A) ((A) & 0x00080000)
237 #define BIT_14(A) ((A) & 0x00100000)
238 #define BIT_15(A) ((A) & 0x00200000)
239 #define BIT_16(A) ((A) & 0x00400000)
240 #define BIT_17(A) ((A) & 0x00800000)
241 #define BIT_18(A) ((A) & 0x01000000)
242 #define BIT_19(A) ((A) & 0x02000000)
243 #define BIT_1A(A) ((A) & 0x04000000)
244 #define BIT_1B(A) ((A) & 0x08000000)
245 #define BIT_1C(A) ((A) & 0x10000000)
246 #define BIT_1D(A) ((A) & 0x20000000)
247 #define BIT_1E(A) ((A) & 0x40000000)
248 #define BIT_1F(A) ((A) & 0x80000000)
250 /* Get the most significant bit for specific sizes */
251 #define GET_MSB_8(A) ((A) & 0x80)
252 #define GET_MSB_9(A) ((A) & 0x100)
253 #define GET_MSB_16(A) ((A) & 0x8000)
254 #define GET_MSB_17(A) ((A) & 0x10000)
255 #define GET_MSB_32(A) ((A) & 0x80000000)
257 #define GET_MSB_33(A) ((A) & 0x100000000)
258 #endif /* M68K_USE_64_BIT */
260 /* Isolate nibbles */
261 #define LOW_NIBBLE(A) ((A) & 0x0f)
262 #define HIGH_NIBBLE(A) ((A) & 0xf0)
264 /* These are used to isolate 8, 16, and 32 bit sizes */
265 #define MASK_OUT_ABOVE_2(A) ((A) & 3)
266 #define MASK_OUT_ABOVE_8(A) ((A) & 0xff)
267 #define MASK_OUT_ABOVE_16(A) ((A) & 0xffff)
268 #define MASK_OUT_BELOW_2(A) ((A) & ~3)
269 #define MASK_OUT_BELOW_8(A) ((A) & ~0xff)
270 #define MASK_OUT_BELOW_16(A) ((A) & ~0xffff)
272 /* No need to mask if we are 32 bit */
273 #if M68K_INT_GT_32_BIT || M68K_USE_64_BIT
274 #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff)
275 #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff)
277 #define MASK_OUT_ABOVE_32(A) (A)
278 #define MASK_OUT_BELOW_32(A) 0
279 #endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */
281 /* Simulate address lines of 68k family */
282 #define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK)
285 /* Shift & Rotate Macros. */
286 #define LSL(A, C) ((A) << (C))
287 #define LSR(A, C) ((A) >> (C))
289 /* Some > 32-bit optimizations */
290 #if M68K_INT_GT_32_BIT
291 /* Shift left and right */
292 #define LSR_32(A, C) ((A) >> (C))
293 #define LSL_32(A, C) ((A) << (C))
295 /* We have to do this because the morons at ANSI decided that shifts
296 * by >= data size are undefined.
298 #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0)
299 #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0)
300 #endif /* M68K_INT_GT_32_BIT */
303 #define LSL_32_64(A, C) ((A) << (C))
304 #define LSR_32_64(A, C) ((A) >> (C))
305 #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C)))
306 #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C)))
307 #endif /* M68K_USE_64_BIT */
309 #define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C)))
310 #define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C)))
311 #define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C)))
312 #define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C)))
313 #define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C)))
314 #define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C)))
316 #define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C)))
317 #define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C)))
318 #define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C)))
319 #define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C)))
320 #define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C)))
321 #define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C)))
325 /* ------------------------------ CPU Access ------------------------------ */
327 /* Access the CPU registers */
328 #define CPU_TYPE m68ki_cpu.cpu_type
330 #define REG_DA m68ki_cpu.dar /* easy access to data and address regs */
331 #define REG_DA_SAVE m68ki_cpu.dar_save
332 #define REG_D m68ki_cpu.dar
333 #define REG_A (m68ki_cpu.dar+8)
334 #define REG_PPC m68ki_cpu.ppc
335 #define REG_PC m68ki_cpu.pc
336 #define REG_SP_BASE m68ki_cpu.sp
337 #define REG_USP m68ki_cpu.sp[0]
338 #define REG_ISP m68ki_cpu.sp[4]
339 #define REG_MSP m68ki_cpu.sp[6]
340 #define REG_SP m68ki_cpu.dar[15]
341 #define REG_VBR m68ki_cpu.vbr
342 #define REG_SFC m68ki_cpu.sfc
343 #define REG_DFC m68ki_cpu.dfc
344 #define REG_CACR m68ki_cpu.cacr
345 #define REG_CAAR m68ki_cpu.caar
346 #define REG_IR m68ki_cpu.ir
348 #define REG_FP m68ki_cpu.fpr
349 #define REG_FPCR m68ki_cpu.fpcr
350 #define REG_FPSR m68ki_cpu.fpsr
351 #define REG_FPIAR m68ki_cpu.fpiar
353 #define FLAG_T1 m68ki_cpu.t1_flag
354 #define FLAG_T0 m68ki_cpu.t0_flag
355 #define FLAG_S m68ki_cpu.s_flag
356 #define FLAG_M m68ki_cpu.m_flag
357 #define FLAG_X m68ki_cpu.x_flag
358 #define FLAG_N m68ki_cpu.n_flag
359 #define FLAG_Z m68ki_cpu.not_z_flag
360 #define FLAG_V m68ki_cpu.v_flag
361 #define FLAG_C m68ki_cpu.c_flag
362 #define FLAG_INT_MASK m68ki_cpu.int_mask
364 #define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */
365 #define CPU_STOPPED m68ki_cpu.stopped
366 #define CPU_PREF_ADDR m68ki_cpu.pref_addr
367 #define CPU_PREF_DATA m68ki_cpu.pref_data
368 #define CPU_ADDRESS_MASK m68ki_cpu.address_mask
369 #define CPU_SR_MASK m68ki_cpu.sr_mask
370 #define CPU_INSTR_MODE m68ki_cpu.instr_mode
371 #define CPU_RUN_MODE m68ki_cpu.run_mode
373 #define CYC_INSTRUCTION m68ki_cpu.cyc_instruction
374 #define CYC_EXCEPTION m68ki_cpu.cyc_exception
375 #define CYC_BCC_NOTAKE_B m68ki_cpu.cyc_bcc_notake_b
376 #define CYC_BCC_NOTAKE_W m68ki_cpu.cyc_bcc_notake_w
377 #define CYC_DBCC_F_NOEXP m68ki_cpu.cyc_dbcc_f_noexp
378 #define CYC_DBCC_F_EXP m68ki_cpu.cyc_dbcc_f_exp
379 #define CYC_SCC_R_TRUE m68ki_cpu.cyc_scc_r_true
380 #define CYC_MOVEM_W m68ki_cpu.cyc_movem_w
381 #define CYC_MOVEM_L m68ki_cpu.cyc_movem_l
382 #define CYC_SHIFT m68ki_cpu.cyc_shift
383 #define CYC_RESET m68ki_cpu.cyc_reset
384 #define HAS_PMMU m68ki_cpu.has_pmmu
385 #define HAS_FPU m68ki_cpu.has_fpu
386 #define PMMU_ENABLED m68ki_cpu.pmmu_enabled
387 #define RESET_CYCLES m68ki_cpu.reset_cycles
390 #define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback
391 #define CALLBACK_BKPT_ACK m68ki_cpu.bkpt_ack_callback
392 #define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback
393 #define CALLBACK_CMPILD_INSTR m68ki_cpu.cmpild_instr_callback
394 #define CALLBACK_RTE_INSTR m68ki_cpu.rte_instr_callback
395 #define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback
396 #define CALLBACK_ILLG_INSTR m68ki_cpu.illg_instr_callback
397 #define CALLBACK_PC_CHANGED m68ki_cpu.pc_changed_callback
398 #define CALLBACK_SET_FC m68ki_cpu.set_fc_callback
399 #define CALLBACK_INSTR_HOOK m68ki_cpu.instr_hook_callback
403 /* ----------------------------- Configuration ---------------------------- */
405 /* These defines are dependant on the configuration defines in m68kconf.h */
407 /* Disable certain comparisons if we're not using all CPU types */
409 #define CPU_TYPE_IS_040_PLUS(A) ((A) & (CPU_TYPE_040 | CPU_TYPE_EC040))
410 #define CPU_TYPE_IS_040_LESS(A) 1
412 #define CPU_TYPE_IS_040_PLUS(A) 0
413 #define CPU_TYPE_IS_040_LESS(A) 1
417 #define CPU_TYPE_IS_030_PLUS(A) ((A) & (CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
418 #define CPU_TYPE_IS_030_LESS(A) 1
420 #define CPU_TYPE_IS_030_PLUS(A) 0
421 #define CPU_TYPE_IS_030_LESS(A) 1
425 #define CPU_TYPE_IS_020_PLUS(A) ((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
426 #define CPU_TYPE_IS_020_LESS(A) 1
428 #define CPU_TYPE_IS_020_PLUS(A) 0
429 #define CPU_TYPE_IS_020_LESS(A) 1
432 #if M68K_EMULATE_EC020
433 #define CPU_TYPE_IS_EC020_PLUS(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
434 #define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010 | CPU_TYPE_EC020))
436 #define CPU_TYPE_IS_EC020_PLUS(A) CPU_TYPE_IS_020_PLUS(A)
437 #define CPU_TYPE_IS_EC020_LESS(A) CPU_TYPE_IS_020_LESS(A)
441 #define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010)
442 #define CPU_TYPE_IS_010_PLUS(A) ((A) & (CPU_TYPE_010 | CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_EC030 | CPU_TYPE_030 | CPU_TYPE_040 | CPU_TYPE_EC040))
443 #define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010))
445 #define CPU_TYPE_IS_010(A) 0
446 #define CPU_TYPE_IS_010_PLUS(A) CPU_TYPE_IS_EC020_PLUS(A)
447 #define CPU_TYPE_IS_010_LESS(A) CPU_TYPE_IS_EC020_LESS(A)
450 #if M68K_EMULATE_020 || M68K_EMULATE_EC020
451 #define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
453 #define CPU_TYPE_IS_020_VARIANT(A) 0
456 #if M68K_EMULATE_040 || M68K_EMULATE_020 || M68K_EMULATE_EC020 || M68K_EMULATE_010
457 #define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000)
459 #define CPU_TYPE_IS_000(A) 1
463 #if !M68K_SEPARATE_READS
464 #define m68k_read_immediate_16(A) m68ki_read_program_16(A)
465 #define m68k_read_immediate_32(A) m68ki_read_program_32(A)
467 #define m68k_read_pcrelative_8(A) m68ki_read_program_8(A)
468 #define m68k_read_pcrelative_16(A) m68ki_read_program_16(A)
469 #define m68k_read_pcrelative_32(A) m68ki_read_program_32(A)
470 #endif /* M68K_SEPARATE_READS */
473 /* Enable or disable callback functions */
474 #if M68K_EMULATE_INT_ACK
475 #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER
476 #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A)
478 #define m68ki_int_ack(A) CALLBACK_INT_ACK(A)
481 /* Default action is to used autovector mode, which is most common */
482 #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR
483 #endif /* M68K_EMULATE_INT_ACK */
485 #if M68K_EMULATE_BKPT_ACK
486 #if M68K_EMULATE_BKPT_ACK == OPT_SPECIFY_HANDLER
487 #define m68ki_bkpt_ack(A) M68K_BKPT_ACK_CALLBACK(A)
489 #define m68ki_bkpt_ack(A) CALLBACK_BKPT_ACK(A)
492 #define m68ki_bkpt_ack(A)
493 #endif /* M68K_EMULATE_BKPT_ACK */
495 #if M68K_EMULATE_RESET
496 #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER
497 #define m68ki_output_reset() M68K_RESET_CALLBACK()
499 #define m68ki_output_reset() CALLBACK_RESET_INSTR()
502 #define m68ki_output_reset()
503 #endif /* M68K_EMULATE_RESET */
505 #if M68K_CMPILD_HAS_CALLBACK
506 #if M68K_CMPILD_HAS_CALLBACK == OPT_SPECIFY_HANDLER
507 #define m68ki_cmpild_callback(v,r) M68K_CMPILD_CALLBACK(v,r)
509 #define m68ki_cmpild_callback(v,r) CALLBACK_CMPILD_INSTR(v,r)
512 #define m68ki_cmpild_callback(v,r)
513 #endif /* M68K_CMPILD_HAS_CALLBACK */
515 #if M68K_RTE_HAS_CALLBACK
516 #if M68K_RTE_HAS_CALLBACK == OPT_SPECIFY_HANDLER
517 #define m68ki_rte_callback() M68K_RTE_CALLBACK()
519 #define m68ki_rte_callback() CALLBACK_RTE_INSTR()
522 #define m68ki_rte_callback()
523 #endif /* M68K_RTE_HAS_CALLBACK */
525 #if M68K_TAS_HAS_CALLBACK
526 #if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER
527 #define m68ki_tas_callback() M68K_TAS_CALLBACK()
529 #define m68ki_tas_callback() CALLBACK_TAS_INSTR()
532 #define m68ki_tas_callback() 1
533 #endif /* M68K_TAS_HAS_CALLBACK */
535 #if M68K_ILLG_HAS_CALLBACK
536 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
537 #define m68ki_illg_callback(opcode) M68K_ILLG_CALLBACK(opcode)
539 #define m68ki_illg_callback(opcode) CALLBACK_ILLG_INSTR(opcode)
542 #define m68ki_illg_callback(opcode) 0 // Default is 0 = not handled, exception will occur
543 #endif /* M68K_ILLG_HAS_CALLBACK */
545 #if M68K_INSTRUCTION_HOOK
546 #if M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
547 #define m68ki_instr_hook(pc) M68K_INSTRUCTION_CALLBACK(pc)
549 #define m68ki_instr_hook(pc) CALLBACK_INSTR_HOOK(pc)
552 #define m68ki_instr_hook(pc)
553 #endif /* M68K_INSTRUCTION_HOOK */
556 #if M68K_MONITOR_PC == OPT_SPECIFY_HANDLER
557 #define m68ki_pc_changed(A) M68K_SET_PC_CALLBACK(ADDRESS_68K(A))
559 #define m68ki_pc_changed(A) CALLBACK_PC_CHANGED(ADDRESS_68K(A))
562 #define m68ki_pc_changed(A)
563 #endif /* M68K_MONITOR_PC */
566 /* Enable or disable function code emulation */
568 #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER
569 #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A)
571 #define m68ki_set_fc(A) CALLBACK_SET_FC(A)
573 #define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA
574 #define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM
575 #define m68ki_get_address_space() m68ki_address_space
577 #define m68ki_set_fc(A)
578 #define m68ki_use_data_space()
579 #define m68ki_use_program_space()
580 #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA
581 #endif /* M68K_EMULATE_FC */
584 /* Enable or disable trace emulation */
585 #if M68K_EMULATE_TRACE
586 /* Initiates trace checking before each instruction (t1) */
587 #define m68ki_trace_t1() m68ki_tracing = FLAG_T1
588 /* adds t0 to trace checking if we encounter change of flow */
589 #define m68ki_trace_t0() m68ki_tracing |= FLAG_T0
590 /* Clear all tracing */
591 #define m68ki_clear_trace() m68ki_tracing = 0
592 /* Cause a trace exception if we are tracing */
593 #define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace()
595 #define m68ki_trace_t1()
596 #define m68ki_trace_t0()
597 #define m68ki_clear_trace()
598 #define m68ki_exception_if_trace()
599 #endif /* M68K_EMULATE_TRACE */
604 #if M68K_EMULATE_ADDRESS_ERROR
607 /* sigjmp() on Mac OS X and *BSD in general saves signal contexts and is super-slow, use sigsetjmp() to tell it not to */
609 extern sigjmp_buf m68ki_aerr_trap;
610 #define m68ki_set_address_error_trap(m68k) \
611 if(sigsetjmp(m68ki_aerr_trap, 0) != 0) \
613 m68ki_exception_address_error(m68k); \
616 if (m68ki_remaining_cycles > 0) \
617 m68ki_remaining_cycles = 0; \
618 return m68ki_initial_cycles; \
622 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
625 m68ki_aerr_address = ADDR; \
626 m68ki_aerr_write_mode = WRITE_MODE; \
627 m68ki_aerr_fc = FC; \
628 siglongjmp(m68ki_aerr_trap, 1); \
631 extern jmp_buf m68ki_aerr_trap;
632 #define m68ki_set_address_error_trap() \
633 if(setjmp(m68ki_aerr_trap) != 0) \
635 m68ki_exception_address_error(); \
639 return m68ki_initial_cycles; \
641 /* ensure we don't re-enter execution loop after an
642 address error if there's no more cycles remaining */ \
643 if(GET_CYCLES() <= 0) \
645 /* return how many clocks we used */ \
646 return m68ki_initial_cycles - GET_CYCLES(); \
650 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
653 m68ki_aerr_address = ADDR; \
654 m68ki_aerr_write_mode = WRITE_MODE; \
655 m68ki_aerr_fc = FC; \
656 longjmp(m68ki_aerr_trap, 1); \
660 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC) \
661 if (CPU_TYPE_IS_010_LESS(CPU_TYPE)) \
663 m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
666 #define m68ki_set_address_error_trap()
667 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC)
668 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC)
669 #endif /* M68K_ADDRESS_ERROR */
674 extern FILE* M68K_LOG_FILEHANDLE
675 extern const char *const m68ki_cpu_names[];
677 #define M68K_DO_LOG(A) if(M68K_LOG_FILEHANDLE) fprintf A
678 #if M68K_LOG_1010_1111
679 #define M68K_DO_LOG_EMU(A) if(M68K_LOG_FILEHANDLE) fprintf A
681 #define M68K_DO_LOG_EMU(A)
684 #define M68K_DO_LOG(A)
685 #define M68K_DO_LOG_EMU(A)
690 /* -------------------------- EA / Operand Access ------------------------- */
693 * The general instruction format follows this pattern:
694 * .... XXX. .... .YYY
695 * where XXX is register X and YYY is register Y
697 /* Data Register Isolation */
698 #define DX (REG_D[(REG_IR >> 9) & 7])
699 #define DY (REG_D[REG_IR & 7])
700 /* Address Register Isolation */
701 #define AX (REG_A[(REG_IR >> 9) & 7])
702 #define AY (REG_A[REG_IR & 7])
705 /* Effective Address Calculations */
706 #define EA_AY_AI_8() AY /* address register indirect */
707 #define EA_AY_AI_16() EA_AY_AI_8()
708 #define EA_AY_AI_32() EA_AY_AI_8()
709 #define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */
710 #define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */
711 #define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */
712 #define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */
713 #define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */
714 #define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */
715 #define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */
716 #define EA_AY_DI_16() EA_AY_DI_8()
717 #define EA_AY_DI_32() EA_AY_DI_8()
718 #define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */
719 #define EA_AY_IX_16() EA_AY_IX_8()
720 #define EA_AY_IX_32() EA_AY_IX_8()
722 #define EA_AX_AI_8() AX
723 #define EA_AX_AI_16() EA_AX_AI_8()
724 #define EA_AX_AI_32() EA_AX_AI_8()
725 #define EA_AX_PI_8() (AX++)
726 #define EA_AX_PI_16() ((AX+=2)-2)
727 #define EA_AX_PI_32() ((AX+=4)-4)
728 #define EA_AX_PD_8() (--AX)
729 #define EA_AX_PD_16() (AX-=2)
730 #define EA_AX_PD_32() (AX-=4)
731 #define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16()))
732 #define EA_AX_DI_16() EA_AX_DI_8()
733 #define EA_AX_DI_32() EA_AX_DI_8()
734 #define EA_AX_IX_8() m68ki_get_ea_ix(AX)
735 #define EA_AX_IX_16() EA_AX_IX_8()
736 #define EA_AX_IX_32() EA_AX_IX_8()
738 #define EA_A7_PI_8() ((REG_A[7]+=2)-2)
739 #define EA_A7_PD_8() (REG_A[7]-=2)
741 #define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */
742 #define EA_AW_16() EA_AW_8()
743 #define EA_AW_32() EA_AW_8()
744 #define EA_AL_8() m68ki_read_imm_32() /* absolute long */
745 #define EA_AL_16() EA_AL_8()
746 #define EA_AL_32() EA_AL_8()
747 #define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */
748 #define EA_PCDI_16() EA_PCDI_8()
749 #define EA_PCDI_32() EA_PCDI_8()
750 #define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */
751 #define EA_PCIX_16() EA_PCIX_8()
752 #define EA_PCIX_32() EA_PCIX_8()
755 #define OPER_I_8() m68ki_read_imm_8()
756 #define OPER_I_16() m68ki_read_imm_16()
757 #define OPER_I_32() m68ki_read_imm_32()
761 /* --------------------------- Status Register ---------------------------- */
763 /* Flag Calculation Macros */
764 #define CFLAG_8(A) (A)
765 #define CFLAG_16(A) ((A)>>8)
767 #if M68K_INT_GT_32_BIT
768 #define CFLAG_ADD_32(S, D, R) ((R)>>24)
769 #define CFLAG_SUB_32(S, D, R) ((R)>>24)
771 #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23)
772 #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23)
773 #endif /* M68K_INT_GT_32_BIT */
775 #define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R))
776 #define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8)
777 #define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24)
779 #define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D))
780 #define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8)
781 #define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24)
783 #define NFLAG_8(A) (A)
784 #define NFLAG_16(A) ((A)>>8)
785 #define NFLAG_32(A) ((A)>>24)
786 #define NFLAG_64(A) ((A)>>56)
788 #define ZFLAG_8(A) MASK_OUT_ABOVE_8(A)
789 #define ZFLAG_16(A) MASK_OUT_ABOVE_16(A)
790 #define ZFLAG_32(A) MASK_OUT_ABOVE_32(A)
794 #define NFLAG_SET 0x80
795 #define NFLAG_CLEAR 0
796 #define CFLAG_SET 0x100
797 #define CFLAG_CLEAR 0
798 #define XFLAG_SET 0x100
799 #define XFLAG_CLEAR 0
800 #define VFLAG_SET 0x80
801 #define VFLAG_CLEAR 0
803 #define ZFLAG_CLEAR 0xffffffff
806 #define SFLAG_CLEAR 0
808 #define MFLAG_CLEAR 0
810 /* Turn flag values into 1 or 0 */
811 #define XFLAG_AS_1() ((FLAG_X>>8)&1)
812 #define NFLAG_AS_1() ((FLAG_N>>7)&1)
813 #define VFLAG_AS_1() ((FLAG_V>>7)&1)
814 #define ZFLAG_AS_1() (!FLAG_Z)
815 #define CFLAG_AS_1() ((FLAG_C>>8)&1)
819 #define COND_CS() (FLAG_C&0x100)
820 #define COND_CC() (!COND_CS())
821 #define COND_VS() (FLAG_V&0x80)
822 #define COND_VC() (!COND_VS())
823 #define COND_NE() FLAG_Z
824 #define COND_EQ() (!COND_NE())
825 #define COND_MI() (FLAG_N&0x80)
826 #define COND_PL() (!COND_MI())
827 #define COND_LT() ((FLAG_N^FLAG_V)&0x80)
828 #define COND_GE() (!COND_LT())
829 #define COND_HI() (COND_CC() && COND_NE())
830 #define COND_LS() (COND_CS() || COND_EQ())
831 #define COND_GT() (COND_GE() && COND_NE())
832 #define COND_LE() (COND_LT() || COND_EQ())
834 /* Reversed conditions */
835 #define COND_NOT_CS() COND_CC()
836 #define COND_NOT_CC() COND_CS()
837 #define COND_NOT_VS() COND_VC()
838 #define COND_NOT_VC() COND_VS()
839 #define COND_NOT_NE() COND_EQ()
840 #define COND_NOT_EQ() COND_NE()
841 #define COND_NOT_MI() COND_PL()
842 #define COND_NOT_PL() COND_MI()
843 #define COND_NOT_LT() COND_GE()
844 #define COND_NOT_GE() COND_LT()
845 #define COND_NOT_HI() COND_LS()
846 #define COND_NOT_LS() COND_HI()
847 #define COND_NOT_GT() COND_LE()
848 #define COND_NOT_LE() COND_GT()
850 /* Not real conditions, but here for convenience */
851 #define COND_XS() (FLAG_X&0x100)
852 #define COND_XC() (!COND_XS)
855 /* Get the condition code register */
856 #define m68ki_get_ccr() ((COND_XS() >> 4) | \
862 /* Get the status register */
863 #define m68ki_get_sr() ( FLAG_T1 | \
872 /* ---------------------------- Cycle Counting ---------------------------- */
874 #define ADD_CYCLES(A) m68ki_remaining_cycles += (A)
875 #define USE_CYCLES(A) m68ki_remaining_cycles -= (A)
876 #define SET_CYCLES(A) m68ki_remaining_cycles = A
877 #define GET_CYCLES() m68ki_remaining_cycles
878 #define USE_ALL_CYCLES() m68ki_remaining_cycles %= CYC_INSTRUCTION[REG_IR]
882 /* ----------------------------- Read / Write ----------------------------- */
884 /* Read from the current address space */
885 #define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space())
886 #define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space())
887 #define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space())
889 /* Write to the current data space */
890 #define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
891 #define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
892 #define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
894 #if M68K_SIMULATE_PD_WRITES
895 #define m68ki_write_32_pd(A, V) m68ki_write_32_pd_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
897 #define m68ki_write_32_pd(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
900 /* Map PC-relative reads */
901 #define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A)
902 #define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A)
903 #define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A)
905 /* Read from the program space */
906 #define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
907 #define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
908 #define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
910 /* Read from the data space */
911 #define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
912 #define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
913 #define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
917 /* ======================================================================== */
918 /* =============================== PROTOTYPES ============================= */
919 /* ======================================================================== */
929 uint cpu_type; /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */
930 uint dar[16]; /* Data and Address Registers */
931 uint dar_save[16]; /* Saved Data and Address Registers (pushed onto the
932 stack when a bus error occurs)*/
933 uint ppc; /* Previous program counter */
934 uint pc; /* Program Counter */
935 uint sp[7]; /* User, Interrupt, and Master Stack Pointers */
936 uint vbr; /* Vector Base Register (m68010+) */
937 uint sfc; /* Source Function Code Register (m68010+) */
938 uint dfc; /* Destination Function Code Register (m68010+) */
939 uint cacr; /* Cache Control Register (m68020, unemulated) */
940 uint caar; /* Cache Address Register (m68020, unemulated) */
941 uint ir; /* Instruction Register */
942 floatx80 fpr[8]; /* FPU Data Register (m68030/040) */
943 uint fpiar; /* FPU Instruction Address Register (m68040) */
944 uint fpsr; /* FPU Status Register (m68040) */
945 uint fpcr; /* FPU Control Register (m68040) */
946 uint t1_flag; /* Trace 1 */
947 uint t0_flag; /* Trace 0 */
948 uint s_flag; /* Supervisor */
949 uint m_flag; /* Master/Interrupt state */
950 uint x_flag; /* Extend */
951 uint n_flag; /* Negative */
952 uint not_z_flag; /* Zero, inverted for speedups */
953 uint v_flag; /* Overflow */
954 uint c_flag; /* Carry */
955 uint int_mask; /* I0-I2 */
956 uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */
957 uint stopped; /* Stopped state */
958 uint pref_addr; /* Last prefetch address */
959 uint pref_data; /* Data in the prefetch queue */
960 uint address_mask; /* Available address pins */
961 uint sr_mask; /* Implemented status register bits */
962 uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */
963 uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */
964 int has_pmmu; /* Indicates if a PMMU available (yes on 030, 040, no on EC030) */
965 int has_fpu; /* Indicates if a FPU available */
966 int pmmu_enabled; /* Indicates if the PMMU is enabled */
967 int fpu_just_reset; /* Indicates the FPU was just reset */
970 /* Clocks required for instructions / exceptions */
971 uint cyc_bcc_notake_b;
972 uint cyc_bcc_notake_w;
973 uint cyc_dbcc_f_noexp;
981 /* Virtual IRQ lines state */
986 uint mmu_crp_aptr, mmu_crp_limit;
987 uint mmu_srp_aptr, mmu_srp_limit;
991 const uint8* cyc_instruction;
992 const uint8* cyc_exception;
994 /* Callbacks to host */
995 int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
996 void (*bkpt_ack_callback)(unsigned int data); /* Breakpoint Acknowledge */
997 void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
998 void (*cmpild_instr_callback)(unsigned int, int); /* Called when a CMPI.L #v, Dn instruction is encountered */
999 void (*rte_instr_callback)(void); /* Called when a RTE instruction is encountered */
1000 int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */
1001 int (*illg_instr_callback)(int); /* Called when an illegal instruction is encountered, allows handling */
1002 void (*pc_changed_callback)(unsigned int new_pc); /* Called when the PC changes by a large amount */
1003 void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */
1004 void (*instr_hook_callback)(unsigned int pc); /* Called every instruction cycle prior to execution */
1009 extern m68ki_cpu_core m68ki_cpu;
1010 extern sint m68ki_remaining_cycles;
1011 extern uint m68ki_tracing;
1012 extern const uint8 m68ki_shift_8_table[];
1013 extern const uint16 m68ki_shift_16_table[];
1014 extern const uint m68ki_shift_32_table[];
1015 extern const uint8 m68ki_exception_cycle_table[][256];
1016 extern uint m68ki_address_space;
1017 extern const uint8 m68ki_ea_idx_cycle_table[];
1019 extern uint m68ki_aerr_address;
1020 extern uint m68ki_aerr_write_mode;
1021 extern uint m68ki_aerr_fc;
1023 /* Forward declarations to keep some of the macros happy */
1024 static inline uint m68ki_read_16_fc (uint address, uint fc);
1025 static inline uint m68ki_read_32_fc (uint address, uint fc);
1026 static inline uint m68ki_get_ea_ix(uint An);
1027 static inline void m68ki_check_interrupts(void); /* ASG: check for interrupts */
1029 /* quick disassembly (used for logging) */
1030 char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type);
1033 /* ======================================================================== */
1034 /* =========================== UTILITY FUNCTIONS ========================== */
1035 /* ======================================================================== */
1038 /* ---------------------------- Read Immediate ---------------------------- */
1040 extern unsigned char read_ranges;
1041 extern unsigned int read_addr[8];
1042 extern unsigned int read_upper[8];
1043 extern unsigned char *read_data[8];
1044 extern unsigned char write_ranges;
1045 extern unsigned int write_addr[8];
1046 extern unsigned int write_upper[8];
1047 extern unsigned char *write_data[8];
1049 extern uint pmmu_translate_addr(uint addr_in);
1051 /* Handles all immediate reads, does address error check, function code setting,
1052 * and prefetching if they are enabled in m68kconf.h
1054 static inline uint m68ki_read_imm_16(void)
1056 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1057 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1059 #if M68K_SEPARATE_READS
1060 /*#if M68K_EMULATE_PMMU
1062 address = pmmu_translate_addr(ADDRESS_68K(CPU_PREF_ADDR));
1066 #if M68K_EMULATE_PREFETCH
1069 if(REG_PC != CPU_PREF_ADDR)
1071 CPU_PREF_ADDR = REG_PC;
1072 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1074 result = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1076 CPU_PREF_ADDR = REG_PC;
1077 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1082 uint32_t address = ADDRESS_68K(REG_PC);
1085 for (int i = 0; i < read_ranges; i++) {
1086 if(address >= read_addr[i] && address < read_upper[i]) {
1087 return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
1091 return m68k_read_immediate_16(ADDRESS_68K(REG_PC-2));
1092 #endif /* M68K_EMULATE_PREFETCH */
1095 static inline uint m68ki_read_imm_8(void)
1097 /* map read immediate 8 to read immediate 16 */
1098 return MASK_OUT_ABOVE_8(m68ki_read_imm_16());
1101 static inline uint m68ki_read_imm_32(void)
1103 #if M68K_SEPARATE_READS
1104 /*#if M68K_EMULATE_PMMU
1106 address = pmmu_translate_addr(ADDRESS_68K(CPU_PREF_ADDR));
1110 #if M68K_EMULATE_PREFETCH
1113 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1114 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1116 if(REG_PC != CPU_PREF_ADDR)
1118 CPU_PREF_ADDR = REG_PC;
1120 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1122 temp_val = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1124 CPU_PREF_ADDR = REG_PC;
1125 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1127 temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | MASK_OUT_ABOVE_16(CPU_PREF_DATA));
1129 CPU_PREF_ADDR = REG_PC;
1130 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1134 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1135 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1136 uint32_t address = ADDRESS_68K(REG_PC);
1138 for (int i = 0; i < read_ranges; i++) {
1139 if(address >= read_addr[i] && address < read_upper[i]) {
1140 return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
1144 return m68k_read_immediate_32(ADDRESS_68K(REG_PC-4));
1145 #endif /* M68K_EMULATE_PREFETCH */
1148 /* ------------------------- Top level read/write ------------------------- */
1150 /* Handles all memory accesses (except for immediate reads if they are
1151 * configured to use separate functions in m68kconf.h).
1152 * All memory accesses must go through these top level functions.
1153 * These functions will also check for address error and set the function
1154 * code if they are enabled in m68kconf.h.
1157 static inline uint m68ki_read_8_fc(uint address, uint fc)
1160 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1162 #if M68K_EMULATE_PMMU
1164 address = pmmu_translate_addr(address);
1167 for (int i = 0; i < read_ranges; i++) {
1168 if(address >= read_addr[i] && address < read_upper[i]) {
1169 return read_data[i][address - read_addr[i]];
1173 return m68k_read_memory_8(ADDRESS_68K(address));
1175 static inline uint m68ki_read_16_fc(uint address, uint fc)
1178 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1179 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1181 #if M68K_EMULATE_PMMU
1183 address = pmmu_translate_addr(address);
1186 for (int i = 0; i < read_ranges; i++) {
1187 if(address >= read_addr[i] && address < read_upper[i]) {
1188 return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
1192 return m68k_read_memory_16(ADDRESS_68K(address));
1194 static inline uint m68ki_read_32_fc(uint address, uint fc)
1197 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1198 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1200 #if M68K_EMULATE_PMMU
1202 address = pmmu_translate_addr(address);
1205 for (int i = 0; i < read_ranges; i++) {
1206 if(address >= read_addr[i] && address < read_upper[i]) {
1207 return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
1211 return m68k_read_memory_32(ADDRESS_68K(address));
1214 static inline void m68ki_write_8_fc(uint address, uint fc, uint value)
1217 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1219 #if M68K_EMULATE_PMMU
1221 address = pmmu_translate_addr(address);
1224 for (int i = 0; i < write_ranges; i++) {
1225 if(address >= write_addr[i] && address < write_upper[i]) {
1226 write_data[i][address - write_addr[i]] = (unsigned char)value;
1231 m68k_write_memory_8(ADDRESS_68K(address), value);
1233 static inline void m68ki_write_16_fc(uint address, uint fc, uint value)
1236 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1237 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1239 #if M68K_EMULATE_PMMU
1241 address = pmmu_translate_addr(address);
1244 for (int i = 0; i < write_ranges; i++) {
1245 if(address >= write_addr[i] && address < write_upper[i]) {
1246 ((short *)(write_data[i] + (address - write_addr[i])))[0] = htobe16(value);
1251 m68k_write_memory_16(ADDRESS_68K(address), value);
1253 static inline void m68ki_write_32_fc(uint address, uint fc, uint value)
1256 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1257 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1259 #if M68K_EMULATE_PMMU
1261 address = pmmu_translate_addr(address);
1264 for (int i = 0; i < write_ranges; i++) {
1265 if(address >= write_addr[i] && address < write_upper[i]) {
1266 ((int *)(write_data[i] + (address - write_addr[i])))[0] = htobe32(value);
1271 m68k_write_memory_32(ADDRESS_68K(address), value);
1274 #if M68K_SIMULATE_PD_WRITES
1275 static inline void m68ki_write_32_pd_fc(uint address, uint fc, uint value)
1278 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1279 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1281 #if M68K_EMULATE_PMMU
1283 address = pmmu_translate_addr(address);
1286 m68k_write_memory_32_pd(ADDRESS_68K(address), value);
1290 /* --------------------- Effective Address Calculation -------------------- */
1292 /* The program counter relative addressing modes cause operands to be
1293 * retrieved from program space, not data space.
1295 static inline uint m68ki_get_ea_pcdi(void)
1297 uint old_pc = REG_PC;
1298 m68ki_use_program_space(); /* auto-disable */
1299 return old_pc + MAKE_INT_16(m68ki_read_imm_16());
1303 static inline uint m68ki_get_ea_pcix(void)
1305 m68ki_use_program_space(); /* auto-disable */
1306 return m68ki_get_ea_ix(REG_PC);
1309 /* Indexed addressing modes are encoded as follows:
1311 * Base instruction format:
1312 * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0
1313 * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An)
1315 * Base instruction format for destination EA in move instructions:
1316 * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0
1317 * x x x x | BASE REG | 1 1 0 | X X X X X X (An)
1319 * Brief extension format:
1320 * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0
1321 * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT
1323 * Full extension format:
1324 * F E D C B A 9 8 7 6 5 4 3 2 1 0
1325 * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS
1326 * BASE DISPLACEMENT (0, 16, 32 bit) (bd)
1327 * OUTER DISPLACEMENT (0, 16, 32 bit) (od)
1329 * D/A: 0 = Dn, 1 = An (Xn)
1330 * W/L: 0 = W (sign extend), 1 = L (.SIZE)
1331 * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE)
1332 * BS: 0=add base reg, 1=suppress base reg (An suppressed)
1333 * IS: 0=add index, 1=suppress index (Xn suppressed)
1334 * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd)
1337 * 0 000 No Memory Indirect
1338 * 0 001 indir prex with null outer
1339 * 0 010 indir prex with word outer
1340 * 0 011 indir prex with long outer
1342 * 0 101 indir postx with null outer
1343 * 0 110 indir postx with word outer
1344 * 0 111 indir postx with long outer
1345 * 1 000 no memory indirect
1346 * 1 001 mem indir with null outer
1347 * 1 010 mem indir with word outer
1348 * 1 011 mem indir with long outer
1349 * 1 100-111 reserved
1351 static inline uint m68ki_get_ea_ix(uint An)
1353 /* An = base register */
1354 uint extension = m68ki_read_imm_16();
1355 uint Xn = 0; /* Index register */
1356 uint bd = 0; /* Base Displacement */
1357 uint od = 0; /* Outer Displacement */
1359 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1361 /* Calculate index */
1362 Xn = REG_DA[extension>>12]; /* Xn */
1363 if(!BIT_B(extension)) /* W/L */
1364 Xn = MAKE_INT_16(Xn);
1366 /* Add base register and displacement and return */
1367 return An + Xn + MAKE_INT_8(extension);
1370 /* Brief extension format */
1371 if(!BIT_8(extension))
1373 /* Calculate index */
1374 Xn = REG_DA[extension>>12]; /* Xn */
1375 if(!BIT_B(extension)) /* W/L */
1376 Xn = MAKE_INT_16(Xn);
1377 /* Add scale if proper CPU type */
1378 if(CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
1379 Xn <<= (extension>>9) & 3; /* SCALE */
1381 /* Add base register and displacement and return */
1382 return An + Xn + MAKE_INT_8(extension);
1385 /* Full extension format */
1387 USE_CYCLES(m68ki_ea_idx_cycle_table[extension&0x3f]);
1389 /* Check if base register is present */
1390 if(BIT_7(extension)) /* BS */
1393 /* Check if index is present */
1394 if(!BIT_6(extension)) /* IS */
1396 Xn = REG_DA[extension>>12]; /* Xn */
1397 if(!BIT_B(extension)) /* W/L */
1398 Xn = MAKE_INT_16(Xn);
1399 Xn <<= (extension>>9) & 3; /* SCALE */
1402 /* Check if base displacement is present */
1403 if(BIT_5(extension)) /* BD SIZE */
1404 bd = BIT_4(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1406 /* If no indirect action, we are done */
1407 if(!(extension&7)) /* No Memory Indirect */
1408 return An + bd + Xn;
1410 /* Check if outer displacement is present */
1411 if(BIT_1(extension)) /* I/IS: od */
1412 od = BIT_0(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1415 if(BIT_2(extension)) /* I/IS: 0 = preindex, 1 = postindex */
1416 return m68ki_read_32(An + bd) + Xn + od;
1419 return m68ki_read_32(An + bd + Xn) + od;
1423 /* Fetch operands */
1424 static inline uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); }
1425 static inline uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);}
1426 static inline uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);}
1427 static inline uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); }
1428 static inline uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);}
1429 static inline uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);}
1430 static inline uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); }
1431 static inline uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);}
1432 static inline uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);}
1433 static inline uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); }
1434 static inline uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);}
1435 static inline uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);}
1436 static inline uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); }
1437 static inline uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);}
1438 static inline uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);}
1440 static inline uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); }
1441 static inline uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);}
1442 static inline uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);}
1443 static inline uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); }
1444 static inline uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);}
1445 static inline uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);}
1446 static inline uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); }
1447 static inline uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);}
1448 static inline uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);}
1449 static inline uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); }
1450 static inline uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);}
1451 static inline uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);}
1452 static inline uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); }
1453 static inline uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);}
1454 static inline uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);}
1456 static inline uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); }
1457 static inline uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); }
1459 static inline uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); }
1460 static inline uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);}
1461 static inline uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);}
1462 static inline uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); }
1463 static inline uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);}
1464 static inline uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);}
1465 static inline uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); }
1466 static inline uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);}
1467 static inline uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);}
1468 static inline uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); }
1469 static inline uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);}
1470 static inline uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);}
1474 /* ---------------------------- Stack Functions --------------------------- */
1476 /* Push/pull data from the stack */
1477 static inline void m68ki_push_16(uint value)
1479 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1480 m68ki_write_16(REG_SP, value);
1483 static inline void m68ki_push_32(uint value)
1485 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1486 m68ki_write_32(REG_SP, value);
1489 static inline uint m68ki_pull_16(void)
1491 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1492 return m68ki_read_16(REG_SP-2);
1495 static inline uint m68ki_pull_32(void)
1497 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1498 return m68ki_read_32(REG_SP-4);
1502 /* Increment/decrement the stack as if doing a push/pull but
1503 * don't do any memory access.
1505 static inline void m68ki_fake_push_16(void)
1507 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1510 static inline void m68ki_fake_push_32(void)
1512 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1515 static inline void m68ki_fake_pull_16(void)
1517 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1520 static inline void m68ki_fake_pull_32(void)
1522 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1526 /* ----------------------------- Program Flow ----------------------------- */
1528 /* Jump to a new program location or vector.
1529 * These functions will also call the pc_changed callback if it was enabled
1532 static inline void m68ki_jump(uint new_pc)
1535 m68ki_pc_changed(REG_PC);
1538 static inline void m68ki_jump_vector(uint vector)
1540 REG_PC = (vector<<2) + REG_VBR;
1541 REG_PC = m68ki_read_data_32(REG_PC);
1542 m68ki_pc_changed(REG_PC);
1546 /* Branch to a new memory location.
1547 * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h.
1548 * So far I've found no problems with not calling pc_changed for 8 or 16
1551 static inline void m68ki_branch_8(uint offset)
1553 REG_PC += MAKE_INT_8(offset);
1556 static inline void m68ki_branch_16(uint offset)
1558 REG_PC += MAKE_INT_16(offset);
1561 static inline void m68ki_branch_32(uint offset)
1564 m68ki_pc_changed(REG_PC);
1567 /* ---------------------------- Status Register --------------------------- */
1569 /* Set the S flag and change the active stack pointer.
1570 * Note that value MUST be 4 or 0.
1572 static inline void m68ki_set_s_flag(uint value)
1574 /* Backup the old stack pointer */
1575 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1576 /* Set the S flag */
1578 /* Set the new stack pointer */
1579 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1582 /* Set the S and M flags and change the active stack pointer.
1583 * Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
1585 static inline void m68ki_set_sm_flag(uint value)
1587 /* Backup the old stack pointer */
1588 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1589 /* Set the S and M flags */
1590 FLAG_S = value & SFLAG_SET;
1591 FLAG_M = value & MFLAG_SET;
1592 /* Set the new stack pointer */
1593 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1596 /* Set the S and M flags. Don't touch the stack pointer. */
1597 static inline void m68ki_set_sm_flag_nosp(uint value)
1599 /* Set the S and M flags */
1600 FLAG_S = value & SFLAG_SET;
1601 FLAG_M = value & MFLAG_SET;
1605 /* Set the condition code register */
1606 static inline void m68ki_set_ccr(uint value)
1608 FLAG_X = BIT_4(value) << 4;
1609 FLAG_N = BIT_3(value) << 4;
1610 FLAG_Z = !BIT_2(value);
1611 FLAG_V = BIT_1(value) << 6;
1612 FLAG_C = BIT_0(value) << 8;
1615 /* Set the status register but don't check for interrupts */
1616 static inline void m68ki_set_sr_noint(uint value)
1618 /* Mask out the "unimplemented" bits */
1619 value &= CPU_SR_MASK;
1621 /* Now set the status register */
1622 FLAG_T1 = BIT_F(value);
1623 FLAG_T0 = BIT_E(value);
1624 FLAG_INT_MASK = value & 0x0700;
1625 m68ki_set_ccr(value);
1626 m68ki_set_sm_flag((value >> 11) & 6);
1629 /* Set the status register but don't check for interrupts nor
1630 * change the stack pointer
1632 static inline void m68ki_set_sr_noint_nosp(uint value)
1634 /* Mask out the "unimplemented" bits */
1635 value &= CPU_SR_MASK;
1637 /* Now set the status register */
1638 FLAG_T1 = BIT_F(value);
1639 FLAG_T0 = BIT_E(value);
1640 FLAG_INT_MASK = value & 0x0700;
1641 m68ki_set_ccr(value);
1642 m68ki_set_sm_flag_nosp((value >> 11) & 6);
1645 /* Set the status register and check for interrupts */
1646 static inline void m68ki_set_sr(uint value)
1648 m68ki_set_sr_noint(value);
1649 m68ki_check_interrupts();
1653 /* ------------------------- Exception Processing ------------------------- */
1655 /* Initiate exception processing */
1656 static inline uint m68ki_init_exception(void)
1658 /* Save the old status register */
1659 uint sr = m68ki_get_sr();
1661 /* Turn off trace flag, clear pending traces */
1662 FLAG_T1 = FLAG_T0 = 0;
1663 m68ki_clear_trace();
1664 /* Enter supervisor mode */
1665 m68ki_set_s_flag(SFLAG_SET);
1670 /* 3 word stack frame (68000 only) */
1671 static inline void m68ki_stack_frame_3word(uint pc, uint sr)
1677 /* Format 0 stack frame.
1678 * This is the standard stack frame for 68010+.
1680 static inline void m68ki_stack_frame_0000(uint pc, uint sr, uint vector)
1682 /* Stack a 3-word frame if we are 68000 */
1683 if(CPU_TYPE == CPU_TYPE_000)
1685 m68ki_stack_frame_3word(pc, sr);
1688 m68ki_push_16(vector<<2);
1693 /* Format 1 stack frame (68020).
1694 * For 68020, this is the 4 word throwaway frame.
1696 static inline void m68ki_stack_frame_0001(uint pc, uint sr, uint vector)
1698 m68ki_push_16(0x1000 | (vector<<2));
1703 /* Format 2 stack frame.
1704 * This is used only by 68020 for trap exceptions.
1706 static inline void m68ki_stack_frame_0010(uint sr, uint vector)
1708 m68ki_push_32(REG_PPC);
1709 m68ki_push_16(0x2000 | (vector<<2));
1710 m68ki_push_32(REG_PC);
1715 /* Bus error stack frame (68000 only).
1717 static inline void m68ki_stack_frame_buserr(uint sr)
1719 m68ki_push_32(REG_PC);
1721 m68ki_push_16(REG_IR);
1722 m68ki_push_32(m68ki_aerr_address); /* access address */
1723 /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC
1724 * R/W 0 = write, 1 = read
1725 * I/N 0 = instruction, 1 = not
1726 * FC 3-bit function code
1728 m68ki_push_16(m68ki_aerr_write_mode | CPU_INSTR_MODE | m68ki_aerr_fc);
1731 /* Format 8 stack frame (68010).
1732 * 68010 only. This is the 29 word bus/address error frame.
1734 static inline void m68ki_stack_frame_1000(uint pc, uint sr, uint vector)
1738 * INTERNAL INFORMATION, 16 WORDS
1740 m68ki_fake_push_32();
1741 m68ki_fake_push_32();
1742 m68ki_fake_push_32();
1743 m68ki_fake_push_32();
1744 m68ki_fake_push_32();
1745 m68ki_fake_push_32();
1746 m68ki_fake_push_32();
1747 m68ki_fake_push_32();
1749 /* INSTRUCTION INPUT BUFFER */
1752 /* UNUSED, RESERVED (not written) */
1753 m68ki_fake_push_16();
1755 /* DATA INPUT BUFFER */
1758 /* UNUSED, RESERVED (not written) */
1759 m68ki_fake_push_16();
1761 /* DATA OUTPUT BUFFER */
1764 /* UNUSED, RESERVED (not written) */
1765 m68ki_fake_push_16();
1770 /* SPECIAL STATUS WORD */
1773 /* 1000, VECTOR OFFSET */
1774 m68ki_push_16(0x8000 | (vector<<2));
1776 /* PROGRAM COUNTER */
1779 /* STATUS REGISTER */
1783 /* Format A stack frame (short bus fault).
1784 * This is used only by 68020 for bus fault and address error
1785 * if the error happens at an instruction boundary.
1786 * PC stacked is address of next instruction.
1788 static inline void m68ki_stack_frame_1010(uint sr, uint vector, uint pc)
1790 /* INTERNAL REGISTER */
1793 /* INTERNAL REGISTER */
1796 /* DATA OUTPUT BUFFER (2 words) */
1799 /* INTERNAL REGISTER */
1802 /* INTERNAL REGISTER */
1805 /* DATA CYCLE FAULT ADDRESS (2 words) */
1808 /* INSTRUCTION PIPE STAGE B */
1811 /* INSTRUCTION PIPE STAGE C */
1814 /* SPECIAL STATUS REGISTER */
1817 /* INTERNAL REGISTER */
1820 /* 1010, VECTOR OFFSET */
1821 m68ki_push_16(0xa000 | (vector<<2));
1823 /* PROGRAM COUNTER */
1826 /* STATUS REGISTER */
1830 /* Format B stack frame (long bus fault).
1831 * This is used only by 68020 for bus fault and address error
1832 * if the error happens during instruction execution.
1833 * PC stacked is address of instruction in progress.
1835 static inline void m68ki_stack_frame_1011(uint sr, uint vector, uint pc)
1837 /* INTERNAL REGISTERS (18 words) */
1848 /* VERSION# (4 bits), INTERNAL INFORMATION */
1851 /* INTERNAL REGISTERS (3 words) */
1855 /* DATA INTPUT BUFFER (2 words) */
1858 /* INTERNAL REGISTERS (2 words) */
1861 /* STAGE B ADDRESS (2 words) */
1864 /* INTERNAL REGISTER (4 words) */
1868 /* DATA OUTPUT BUFFER (2 words) */
1871 /* INTERNAL REGISTER */
1874 /* INTERNAL REGISTER */
1877 /* DATA CYCLE FAULT ADDRESS (2 words) */
1880 /* INSTRUCTION PIPE STAGE B */
1883 /* INSTRUCTION PIPE STAGE C */
1886 /* SPECIAL STATUS REGISTER */
1889 /* INTERNAL REGISTER */
1892 /* 1011, VECTOR OFFSET */
1893 m68ki_push_16(0xb000 | (vector<<2));
1895 /* PROGRAM COUNTER */
1898 /* STATUS REGISTER */
1903 /* Used for Group 2 exceptions.
1904 * These stack a type 2 frame on the 020.
1906 static inline void m68ki_exception_trap(uint vector)
1908 uint sr = m68ki_init_exception();
1910 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1911 m68ki_stack_frame_0000(REG_PC, sr, vector);
1913 m68ki_stack_frame_0010(sr, vector);
1915 m68ki_jump_vector(vector);
1917 /* Use up some clock cycles and undo the instruction's cycles */
1918 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1921 /* Trap#n stacks a 0 frame but behaves like group2 otherwise */
1922 static inline void m68ki_exception_trapN(uint vector)
1924 uint sr = m68ki_init_exception();
1925 m68ki_stack_frame_0000(REG_PC, sr, vector);
1926 m68ki_jump_vector(vector);
1928 /* Use up some clock cycles and undo the instruction's cycles */
1929 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1932 /* Exception for trace mode */
1933 static inline void m68ki_exception_trace(void)
1935 uint sr = m68ki_init_exception();
1937 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1939 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1940 if(CPU_TYPE_IS_000(CPU_TYPE))
1942 CPU_INSTR_MODE = INSTRUCTION_NO;
1944 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1945 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_TRACE);
1948 m68ki_stack_frame_0010(sr, EXCEPTION_TRACE);
1950 m68ki_jump_vector(EXCEPTION_TRACE);
1952 /* Trace nullifies a STOP instruction */
1953 CPU_STOPPED &= ~STOP_LEVEL_STOP;
1955 /* Use up some clock cycles */
1956 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]);
1959 /* Exception for privilege violation */
1960 static inline void m68ki_exception_privilege_violation(void)
1962 uint sr = m68ki_init_exception();
1964 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1965 if(CPU_TYPE_IS_000(CPU_TYPE))
1967 CPU_INSTR_MODE = INSTRUCTION_NO;
1969 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1971 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_PRIVILEGE_VIOLATION);
1972 m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION);
1974 /* Use up some clock cycles and undo the instruction's cycles */
1975 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]);
1978 extern jmp_buf m68ki_bus_error_jmp_buf;
1980 #define m68ki_check_bus_error_trap() setjmp(m68ki_bus_error_jmp_buf)
1982 /* Exception for bus error */
1983 static inline void m68ki_exception_bus_error(void)
1987 /* If we were processing a bus error, address error, or reset,
1988 * this is a catastrophic failure.
1991 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
1993 m68k_read_memory_8(0x00ffff01);
1994 CPU_STOPPED = STOP_LEVEL_HALT;
1997 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
1999 /* Use up some clock cycles and undo the instruction's cycles */
2000 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_BUS_ERROR] - CYC_INSTRUCTION[REG_IR]);
2002 for (i = 15; i >= 0; i--){
2003 REG_DA[i] = REG_DA_SAVE[i];
2006 uint sr = m68ki_init_exception();
2007 m68ki_stack_frame_1000(REG_PPC, sr, EXCEPTION_BUS_ERROR);
2009 m68ki_jump_vector(EXCEPTION_BUS_ERROR);
2010 longjmp(m68ki_bus_error_jmp_buf, 1);
2013 extern int cpu_log_enabled;
2015 /* Exception for A-Line instructions */
2016 static inline void m68ki_exception_1010(void)
2019 #if M68K_LOG_1010_1111 == OPT_ON
2020 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1010 instruction %04x (%s)\n",
2021 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2022 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2025 sr = m68ki_init_exception();
2026 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1010);
2027 m68ki_jump_vector(EXCEPTION_1010);
2029 /* Use up some clock cycles and undo the instruction's cycles */
2030 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]);
2033 /* Exception for F-Line instructions */
2034 static inline void m68ki_exception_1111(void)
2038 #if M68K_LOG_1010_1111 == OPT_ON
2039 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1111 instruction %04x (%s)\n",
2040 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2041 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2044 sr = m68ki_init_exception();
2045 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1111);
2046 m68ki_jump_vector(EXCEPTION_1111);
2048 /* Use up some clock cycles and undo the instruction's cycles */
2049 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]);
2052 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
2053 extern int m68ki_illg_callback(int);
2056 /* Exception for illegal instructions */
2057 static inline void m68ki_exception_illegal(void)
2061 M68K_DO_LOG((M68K_LOG_FILEHANDLE "%s at %08x: illegal instruction %04x (%s)\n",
2062 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2063 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2064 if (m68ki_illg_callback(REG_IR))
2067 sr = m68ki_init_exception();
2069 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2070 if(CPU_TYPE_IS_000(CPU_TYPE))
2072 CPU_INSTR_MODE = INSTRUCTION_NO;
2074 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2076 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_ILLEGAL_INSTRUCTION);
2077 m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION);
2079 /* Use up some clock cycles and undo the instruction's cycles */
2080 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]);
2083 /* Exception for format errror in RTE */
2084 static inline void m68ki_exception_format_error(void)
2086 uint sr = m68ki_init_exception();
2087 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_FORMAT_ERROR);
2088 m68ki_jump_vector(EXCEPTION_FORMAT_ERROR);
2090 /* Use up some clock cycles and undo the instruction's cycles */
2091 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_FORMAT_ERROR] - CYC_INSTRUCTION[REG_IR]);
2094 /* Exception for address error */
2095 static inline void m68ki_exception_address_error(void)
2097 uint sr = m68ki_init_exception();
2099 /* If we were processing a bus error, address error, or reset,
2100 * this is a catastrophic failure.
2103 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
2105 m68k_read_memory_8(0x00ffff01);
2106 CPU_STOPPED = STOP_LEVEL_HALT;
2109 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
2111 /* Note: This is implemented for 68000 only! */
2112 m68ki_stack_frame_buserr(sr);
2114 m68ki_jump_vector(EXCEPTION_ADDRESS_ERROR);
2116 /* Use up some clock cycles. Note that we don't need to undo the
2117 instruction's cycles here as we've longjmp:ed directly from the
2118 instruction handler without passing the part of the excecute loop
2119 that deducts instruction cycles */
2120 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ADDRESS_ERROR]);
2124 /* Service an interrupt request and start exception processing */
2125 static inline void m68ki_exception_interrupt(uint int_level)
2131 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2132 if(CPU_TYPE_IS_000(CPU_TYPE))
2134 CPU_INSTR_MODE = INSTRUCTION_NO;
2136 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2138 /* Turn off the stopped state */
2139 CPU_STOPPED &= ~STOP_LEVEL_STOP;
2141 /* If we are halted, don't do anything */
2145 /* Acknowledge the interrupt */
2146 vector = m68ki_int_ack(int_level);
2148 /* Get the interrupt vector */
2149 if(vector == M68K_INT_ACK_AUTOVECTOR)
2150 /* Use the autovectors. This is the most commonly used implementation */
2151 vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level;
2152 else if(vector == M68K_INT_ACK_SPURIOUS)
2153 /* Called if no devices respond to the interrupt acknowledge */
2154 vector = EXCEPTION_SPURIOUS_INTERRUPT;
2155 else if(vector > 255)
2157 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: Interrupt acknowledge returned invalid vector $%x\n",
2158 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PC), vector));
2162 /* Start exception processing */
2163 sr = m68ki_init_exception();
2165 /* Set the interrupt mask to the level of the one being serviced */
2166 FLAG_INT_MASK = int_level<<8;
2168 /* Get the new PC */
2169 new_pc = m68ki_read_data_32((vector<<2) + REG_VBR);
2171 /* If vector is uninitialized, call the uninitialized interrupt vector */
2173 new_pc = m68ki_read_data_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2) + REG_VBR);
2175 /* Generate a stack frame */
2176 m68ki_stack_frame_0000(REG_PC, sr, vector);
2177 if(FLAG_M && CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
2179 /* Create throwaway frame */
2180 m68ki_set_sm_flag(FLAG_S); /* clear M */
2181 sr |= 0x2000; /* Same as SR in master stack frame except S is forced high */
2182 m68ki_stack_frame_0001(REG_PC, sr, vector);
2187 /* Defer cycle counting until later */
2188 USE_CYCLES(CYC_EXCEPTION[vector]);
2190 #if !M68K_EMULATE_INT_ACK
2191 /* Automatically clear IRQ if we are not using an acknowledge scheme */
2193 #endif /* M68K_EMULATE_INT_ACK */
2197 /* ASG: Check for interrupts */
2198 static inline void m68ki_check_interrupts(void)
2200 if(m68ki_cpu.nmi_pending)
2202 m68ki_cpu.nmi_pending = FALSE;
2203 m68ki_exception_interrupt(7);
2205 else if(CPU_INT_LEVEL > FLAG_INT_MASK)
2206 m68ki_exception_interrupt(CPU_INT_LEVEL>>8);
2211 /* ======================================================================== */
2212 /* ============================== END OF FILE ============================= */
2213 /* ======================================================================== */
2219 #endif /* M68KCPU__HEADER */