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 PMMU_ENABLED m68ki_cpu.pmmu_enabled
386 #define RESET_CYCLES m68ki_cpu.reset_cycles
389 #define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback
390 #define CALLBACK_BKPT_ACK m68ki_cpu.bkpt_ack_callback
391 #define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback
392 #define CALLBACK_CMPILD_INSTR m68ki_cpu.cmpild_instr_callback
393 #define CALLBACK_RTE_INSTR m68ki_cpu.rte_instr_callback
394 #define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback
395 #define CALLBACK_ILLG_INSTR m68ki_cpu.illg_instr_callback
396 #define CALLBACK_PC_CHANGED m68ki_cpu.pc_changed_callback
397 #define CALLBACK_SET_FC m68ki_cpu.set_fc_callback
398 #define CALLBACK_INSTR_HOOK m68ki_cpu.instr_hook_callback
402 /* ----------------------------- Configuration ---------------------------- */
404 /* These defines are dependant on the configuration defines in m68kconf.h */
406 /* Disable certain comparisons if we're not using all CPU types */
408 #define CPU_TYPE_IS_040_PLUS(A) ((A) & (CPU_TYPE_040 | CPU_TYPE_EC040))
409 #define CPU_TYPE_IS_040_LESS(A) 1
411 #define CPU_TYPE_IS_040_PLUS(A) 0
412 #define CPU_TYPE_IS_040_LESS(A) 1
416 #define CPU_TYPE_IS_030_PLUS(A) ((A) & (CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
417 #define CPU_TYPE_IS_030_LESS(A) 1
419 #define CPU_TYPE_IS_030_PLUS(A) 0
420 #define CPU_TYPE_IS_030_LESS(A) 1
424 #define CPU_TYPE_IS_020_PLUS(A) ((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
425 #define CPU_TYPE_IS_020_LESS(A) 1
427 #define CPU_TYPE_IS_020_PLUS(A) 0
428 #define CPU_TYPE_IS_020_LESS(A) 1
431 #if M68K_EMULATE_EC020
432 #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))
433 #define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010 | CPU_TYPE_EC020))
435 #define CPU_TYPE_IS_EC020_PLUS(A) CPU_TYPE_IS_020_PLUS(A)
436 #define CPU_TYPE_IS_EC020_LESS(A) CPU_TYPE_IS_020_LESS(A)
440 #define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010)
441 #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))
442 #define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010))
444 #define CPU_TYPE_IS_010(A) 0
445 #define CPU_TYPE_IS_010_PLUS(A) CPU_TYPE_IS_EC020_PLUS(A)
446 #define CPU_TYPE_IS_010_LESS(A) CPU_TYPE_IS_EC020_LESS(A)
449 #if M68K_EMULATE_020 || M68K_EMULATE_EC020
450 #define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
452 #define CPU_TYPE_IS_020_VARIANT(A) 0
455 #if M68K_EMULATE_040 || M68K_EMULATE_020 || M68K_EMULATE_EC020 || M68K_EMULATE_010
456 #define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000)
458 #define CPU_TYPE_IS_000(A) 1
462 #if !M68K_SEPARATE_READS
463 #define m68k_read_immediate_16(A) m68ki_read_program_16(A)
464 #define m68k_read_immediate_32(A) m68ki_read_program_32(A)
466 #define m68k_read_pcrelative_8(A) m68ki_read_program_8(A)
467 #define m68k_read_pcrelative_16(A) m68ki_read_program_16(A)
468 #define m68k_read_pcrelative_32(A) m68ki_read_program_32(A)
469 #endif /* M68K_SEPARATE_READS */
472 /* Enable or disable callback functions */
473 #if M68K_EMULATE_INT_ACK
474 #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER
475 #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A)
477 #define m68ki_int_ack(A) CALLBACK_INT_ACK(A)
480 /* Default action is to used autovector mode, which is most common */
481 #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR
482 #endif /* M68K_EMULATE_INT_ACK */
484 #if M68K_EMULATE_BKPT_ACK
485 #if M68K_EMULATE_BKPT_ACK == OPT_SPECIFY_HANDLER
486 #define m68ki_bkpt_ack(A) M68K_BKPT_ACK_CALLBACK(A)
488 #define m68ki_bkpt_ack(A) CALLBACK_BKPT_ACK(A)
491 #define m68ki_bkpt_ack(A)
492 #endif /* M68K_EMULATE_BKPT_ACK */
494 #if M68K_EMULATE_RESET
495 #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER
496 #define m68ki_output_reset() M68K_RESET_CALLBACK()
498 #define m68ki_output_reset() CALLBACK_RESET_INSTR()
501 #define m68ki_output_reset()
502 #endif /* M68K_EMULATE_RESET */
504 #if M68K_CMPILD_HAS_CALLBACK
505 #if M68K_CMPILD_HAS_CALLBACK == OPT_SPECIFY_HANDLER
506 #define m68ki_cmpild_callback(v,r) M68K_CMPILD_CALLBACK(v,r)
508 #define m68ki_cmpild_callback(v,r) CALLBACK_CMPILD_INSTR(v,r)
511 #define m68ki_cmpild_callback(v,r)
512 #endif /* M68K_CMPILD_HAS_CALLBACK */
514 #if M68K_RTE_HAS_CALLBACK
515 #if M68K_RTE_HAS_CALLBACK == OPT_SPECIFY_HANDLER
516 #define m68ki_rte_callback() M68K_RTE_CALLBACK()
518 #define m68ki_rte_callback() CALLBACK_RTE_INSTR()
521 #define m68ki_rte_callback()
522 #endif /* M68K_RTE_HAS_CALLBACK */
524 #if M68K_TAS_HAS_CALLBACK
525 #if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER
526 #define m68ki_tas_callback() M68K_TAS_CALLBACK()
528 #define m68ki_tas_callback() CALLBACK_TAS_INSTR()
531 #define m68ki_tas_callback() 1
532 #endif /* M68K_TAS_HAS_CALLBACK */
534 #if M68K_ILLG_HAS_CALLBACK
535 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
536 #define m68ki_illg_callback(opcode) M68K_ILLG_CALLBACK(opcode)
538 #define m68ki_illg_callback(opcode) CALLBACK_ILLG_INSTR(opcode)
541 #define m68ki_illg_callback(opcode) 0 // Default is 0 = not handled, exception will occur
542 #endif /* M68K_ILLG_HAS_CALLBACK */
544 #if M68K_INSTRUCTION_HOOK
545 #if M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
546 #define m68ki_instr_hook(pc) M68K_INSTRUCTION_CALLBACK(pc)
548 #define m68ki_instr_hook(pc) CALLBACK_INSTR_HOOK(pc)
551 #define m68ki_instr_hook(pc)
552 #endif /* M68K_INSTRUCTION_HOOK */
555 #if M68K_MONITOR_PC == OPT_SPECIFY_HANDLER
556 #define m68ki_pc_changed(A) M68K_SET_PC_CALLBACK(ADDRESS_68K(A))
558 #define m68ki_pc_changed(A) CALLBACK_PC_CHANGED(ADDRESS_68K(A))
561 #define m68ki_pc_changed(A)
562 #endif /* M68K_MONITOR_PC */
565 /* Enable or disable function code emulation */
567 #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER
568 #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A)
570 #define m68ki_set_fc(A) CALLBACK_SET_FC(A)
572 #define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA
573 #define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM
574 #define m68ki_get_address_space() m68ki_address_space
576 #define m68ki_set_fc(A)
577 #define m68ki_use_data_space()
578 #define m68ki_use_program_space()
579 #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA
580 #endif /* M68K_EMULATE_FC */
583 /* Enable or disable trace emulation */
584 #if M68K_EMULATE_TRACE
585 /* Initiates trace checking before each instruction (t1) */
586 #define m68ki_trace_t1() m68ki_tracing = FLAG_T1
587 /* adds t0 to trace checking if we encounter change of flow */
588 #define m68ki_trace_t0() m68ki_tracing |= FLAG_T0
589 /* Clear all tracing */
590 #define m68ki_clear_trace() m68ki_tracing = 0
591 /* Cause a trace exception if we are tracing */
592 #define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace()
594 #define m68ki_trace_t1()
595 #define m68ki_trace_t0()
596 #define m68ki_clear_trace()
597 #define m68ki_exception_if_trace()
598 #endif /* M68K_EMULATE_TRACE */
603 #if M68K_EMULATE_ADDRESS_ERROR
606 /* sigjmp() on Mac OS X and *BSD in general saves signal contexts and is super-slow, use sigsetjmp() to tell it not to */
608 extern sigjmp_buf m68ki_aerr_trap;
609 #define m68ki_set_address_error_trap(m68k) \
610 if(sigsetjmp(m68ki_aerr_trap, 0) != 0) \
612 m68ki_exception_address_error(m68k); \
615 if (m68ki_remaining_cycles > 0) \
616 m68ki_remaining_cycles = 0; \
617 return m68ki_initial_cycles; \
621 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
624 m68ki_aerr_address = ADDR; \
625 m68ki_aerr_write_mode = WRITE_MODE; \
626 m68ki_aerr_fc = FC; \
627 siglongjmp(m68ki_aerr_trap, 1); \
630 extern jmp_buf m68ki_aerr_trap;
631 #define m68ki_set_address_error_trap() \
632 if(setjmp(m68ki_aerr_trap) != 0) \
634 m68ki_exception_address_error(); \
638 return m68ki_initial_cycles; \
640 /* ensure we don't re-enter execution loop after an
641 address error if there's no more cycles remaining */ \
642 if(GET_CYCLES() <= 0) \
644 /* return how many clocks we used */ \
645 return m68ki_initial_cycles - GET_CYCLES(); \
649 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
652 m68ki_aerr_address = ADDR; \
653 m68ki_aerr_write_mode = WRITE_MODE; \
654 m68ki_aerr_fc = FC; \
655 longjmp(m68ki_aerr_trap, 1); \
659 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC) \
660 if (CPU_TYPE_IS_010_LESS(CPU_TYPE)) \
662 m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
665 #define m68ki_set_address_error_trap()
666 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC)
667 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC)
668 #endif /* M68K_ADDRESS_ERROR */
673 extern FILE* M68K_LOG_FILEHANDLE
674 extern const char *const m68ki_cpu_names[];
676 #define M68K_DO_LOG(A) if(M68K_LOG_FILEHANDLE) fprintf A
677 #if M68K_LOG_1010_1111
678 #define M68K_DO_LOG_EMU(A) if(M68K_LOG_FILEHANDLE) fprintf A
680 #define M68K_DO_LOG_EMU(A)
683 #define M68K_DO_LOG(A)
684 #define M68K_DO_LOG_EMU(A)
689 /* -------------------------- EA / Operand Access ------------------------- */
692 * The general instruction format follows this pattern:
693 * .... XXX. .... .YYY
694 * where XXX is register X and YYY is register Y
696 /* Data Register Isolation */
697 #define DX (REG_D[(REG_IR >> 9) & 7])
698 #define DY (REG_D[REG_IR & 7])
699 /* Address Register Isolation */
700 #define AX (REG_A[(REG_IR >> 9) & 7])
701 #define AY (REG_A[REG_IR & 7])
704 /* Effective Address Calculations */
705 #define EA_AY_AI_8() AY /* address register indirect */
706 #define EA_AY_AI_16() EA_AY_AI_8()
707 #define EA_AY_AI_32() EA_AY_AI_8()
708 #define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */
709 #define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */
710 #define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */
711 #define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */
712 #define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */
713 #define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */
714 #define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */
715 #define EA_AY_DI_16() EA_AY_DI_8()
716 #define EA_AY_DI_32() EA_AY_DI_8()
717 #define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */
718 #define EA_AY_IX_16() EA_AY_IX_8()
719 #define EA_AY_IX_32() EA_AY_IX_8()
721 #define EA_AX_AI_8() AX
722 #define EA_AX_AI_16() EA_AX_AI_8()
723 #define EA_AX_AI_32() EA_AX_AI_8()
724 #define EA_AX_PI_8() (AX++)
725 #define EA_AX_PI_16() ((AX+=2)-2)
726 #define EA_AX_PI_32() ((AX+=4)-4)
727 #define EA_AX_PD_8() (--AX)
728 #define EA_AX_PD_16() (AX-=2)
729 #define EA_AX_PD_32() (AX-=4)
730 #define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16()))
731 #define EA_AX_DI_16() EA_AX_DI_8()
732 #define EA_AX_DI_32() EA_AX_DI_8()
733 #define EA_AX_IX_8() m68ki_get_ea_ix(AX)
734 #define EA_AX_IX_16() EA_AX_IX_8()
735 #define EA_AX_IX_32() EA_AX_IX_8()
737 #define EA_A7_PI_8() ((REG_A[7]+=2)-2)
738 #define EA_A7_PD_8() (REG_A[7]-=2)
740 #define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */
741 #define EA_AW_16() EA_AW_8()
742 #define EA_AW_32() EA_AW_8()
743 #define EA_AL_8() m68ki_read_imm_32() /* absolute long */
744 #define EA_AL_16() EA_AL_8()
745 #define EA_AL_32() EA_AL_8()
746 #define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */
747 #define EA_PCDI_16() EA_PCDI_8()
748 #define EA_PCDI_32() EA_PCDI_8()
749 #define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */
750 #define EA_PCIX_16() EA_PCIX_8()
751 #define EA_PCIX_32() EA_PCIX_8()
754 #define OPER_I_8() m68ki_read_imm_8()
755 #define OPER_I_16() m68ki_read_imm_16()
756 #define OPER_I_32() m68ki_read_imm_32()
760 /* --------------------------- Status Register ---------------------------- */
762 /* Flag Calculation Macros */
763 #define CFLAG_8(A) (A)
764 #define CFLAG_16(A) ((A)>>8)
766 #if M68K_INT_GT_32_BIT
767 #define CFLAG_ADD_32(S, D, R) ((R)>>24)
768 #define CFLAG_SUB_32(S, D, R) ((R)>>24)
770 #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23)
771 #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23)
772 #endif /* M68K_INT_GT_32_BIT */
774 #define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R))
775 #define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8)
776 #define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24)
778 #define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D))
779 #define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8)
780 #define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24)
782 #define NFLAG_8(A) (A)
783 #define NFLAG_16(A) ((A)>>8)
784 #define NFLAG_32(A) ((A)>>24)
785 #define NFLAG_64(A) ((A)>>56)
787 #define ZFLAG_8(A) MASK_OUT_ABOVE_8(A)
788 #define ZFLAG_16(A) MASK_OUT_ABOVE_16(A)
789 #define ZFLAG_32(A) MASK_OUT_ABOVE_32(A)
793 #define NFLAG_SET 0x80
794 #define NFLAG_CLEAR 0
795 #define CFLAG_SET 0x100
796 #define CFLAG_CLEAR 0
797 #define XFLAG_SET 0x100
798 #define XFLAG_CLEAR 0
799 #define VFLAG_SET 0x80
800 #define VFLAG_CLEAR 0
802 #define ZFLAG_CLEAR 0xffffffff
805 #define SFLAG_CLEAR 0
807 #define MFLAG_CLEAR 0
809 /* Turn flag values into 1 or 0 */
810 #define XFLAG_AS_1() ((FLAG_X>>8)&1)
811 #define NFLAG_AS_1() ((FLAG_N>>7)&1)
812 #define VFLAG_AS_1() ((FLAG_V>>7)&1)
813 #define ZFLAG_AS_1() (!FLAG_Z)
814 #define CFLAG_AS_1() ((FLAG_C>>8)&1)
818 #define COND_CS() (FLAG_C&0x100)
819 #define COND_CC() (!COND_CS())
820 #define COND_VS() (FLAG_V&0x80)
821 #define COND_VC() (!COND_VS())
822 #define COND_NE() FLAG_Z
823 #define COND_EQ() (!COND_NE())
824 #define COND_MI() (FLAG_N&0x80)
825 #define COND_PL() (!COND_MI())
826 #define COND_LT() ((FLAG_N^FLAG_V)&0x80)
827 #define COND_GE() (!COND_LT())
828 #define COND_HI() (COND_CC() && COND_NE())
829 #define COND_LS() (COND_CS() || COND_EQ())
830 #define COND_GT() (COND_GE() && COND_NE())
831 #define COND_LE() (COND_LT() || COND_EQ())
833 /* Reversed conditions */
834 #define COND_NOT_CS() COND_CC()
835 #define COND_NOT_CC() COND_CS()
836 #define COND_NOT_VS() COND_VC()
837 #define COND_NOT_VC() COND_VS()
838 #define COND_NOT_NE() COND_EQ()
839 #define COND_NOT_EQ() COND_NE()
840 #define COND_NOT_MI() COND_PL()
841 #define COND_NOT_PL() COND_MI()
842 #define COND_NOT_LT() COND_GE()
843 #define COND_NOT_GE() COND_LT()
844 #define COND_NOT_HI() COND_LS()
845 #define COND_NOT_LS() COND_HI()
846 #define COND_NOT_GT() COND_LE()
847 #define COND_NOT_LE() COND_GT()
849 /* Not real conditions, but here for convenience */
850 #define COND_XS() (FLAG_X&0x100)
851 #define COND_XC() (!COND_XS)
854 /* Get the condition code register */
855 #define m68ki_get_ccr() ((COND_XS() >> 4) | \
861 /* Get the status register */
862 #define m68ki_get_sr() ( FLAG_T1 | \
871 /* ---------------------------- Cycle Counting ---------------------------- */
873 #define ADD_CYCLES(A) m68ki_remaining_cycles += (A)
874 #define USE_CYCLES(A) m68ki_remaining_cycles -= (A)
875 #define SET_CYCLES(A) m68ki_remaining_cycles = A
876 #define GET_CYCLES() m68ki_remaining_cycles
877 #define USE_ALL_CYCLES() m68ki_remaining_cycles %= CYC_INSTRUCTION[REG_IR]
881 /* ----------------------------- Read / Write ----------------------------- */
883 /* Read from the current address space */
884 #define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space())
885 #define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space())
886 #define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space())
888 /* Write to the current data space */
889 #define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
890 #define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
891 #define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
893 #if M68K_SIMULATE_PD_WRITES
894 #define m68ki_write_32_pd(A, V) m68ki_write_32_pd_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
896 #define m68ki_write_32_pd(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
899 /* Map PC-relative reads */
900 #define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A)
901 #define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A)
902 #define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A)
904 /* Read from the program space */
905 #define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
906 #define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
907 #define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
909 /* Read from the data space */
910 #define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
911 #define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
912 #define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
916 /* ======================================================================== */
917 /* =============================== PROTOTYPES ============================= */
918 /* ======================================================================== */
928 uint cpu_type; /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */
929 uint dar[16]; /* Data and Address Registers */
930 uint dar_save[16]; /* Saved Data and Address Registers (pushed onto the
931 stack when a bus error occurs)*/
932 uint ppc; /* Previous program counter */
933 uint pc; /* Program Counter */
934 uint sp[7]; /* User, Interrupt, and Master Stack Pointers */
935 uint vbr; /* Vector Base Register (m68010+) */
936 uint sfc; /* Source Function Code Register (m68010+) */
937 uint dfc; /* Destination Function Code Register (m68010+) */
938 uint cacr; /* Cache Control Register (m68020, unemulated) */
939 uint caar; /* Cache Address Register (m68020, unemulated) */
940 uint ir; /* Instruction Register */
941 floatx80 fpr[8]; /* FPU Data Register (m68030/040) */
942 uint fpiar; /* FPU Instruction Address Register (m68040) */
943 uint fpsr; /* FPU Status Register (m68040) */
944 uint fpcr; /* FPU Control Register (m68040) */
945 uint t1_flag; /* Trace 1 */
946 uint t0_flag; /* Trace 0 */
947 uint s_flag; /* Supervisor */
948 uint m_flag; /* Master/Interrupt state */
949 uint x_flag; /* Extend */
950 uint n_flag; /* Negative */
951 uint not_z_flag; /* Zero, inverted for speedups */
952 uint v_flag; /* Overflow */
953 uint c_flag; /* Carry */
954 uint int_mask; /* I0-I2 */
955 uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */
956 uint stopped; /* Stopped state */
957 uint pref_addr; /* Last prefetch address */
958 uint pref_data; /* Data in the prefetch queue */
959 uint address_mask; /* Available address pins */
960 uint sr_mask; /* Implemented status register bits */
961 uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */
962 uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */
963 int has_pmmu; /* Indicates if a PMMU available (yes on 030, 040, no on EC030) */
964 int pmmu_enabled; /* Indicates if the PMMU is enabled */
965 int fpu_just_reset; /* Indicates the FPU was just reset */
968 /* Clocks required for instructions / exceptions */
969 uint cyc_bcc_notake_b;
970 uint cyc_bcc_notake_w;
971 uint cyc_dbcc_f_noexp;
979 /* Virtual IRQ lines state */
984 uint mmu_crp_aptr, mmu_crp_limit;
985 uint mmu_srp_aptr, mmu_srp_limit;
989 const uint8* cyc_instruction;
990 const uint8* cyc_exception;
992 /* Callbacks to host */
993 int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
994 void (*bkpt_ack_callback)(unsigned int data); /* Breakpoint Acknowledge */
995 void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
996 void (*cmpild_instr_callback)(unsigned int, int); /* Called when a CMPI.L #v, Dn instruction is encountered */
997 void (*rte_instr_callback)(void); /* Called when a RTE instruction is encountered */
998 int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */
999 int (*illg_instr_callback)(int); /* Called when an illegal instruction is encountered, allows handling */
1000 void (*pc_changed_callback)(unsigned int new_pc); /* Called when the PC changes by a large amount */
1001 void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */
1002 void (*instr_hook_callback)(unsigned int pc); /* Called every instruction cycle prior to execution */
1007 extern m68ki_cpu_core m68ki_cpu;
1008 extern sint m68ki_remaining_cycles;
1009 extern uint m68ki_tracing;
1010 extern const uint8 m68ki_shift_8_table[];
1011 extern const uint16 m68ki_shift_16_table[];
1012 extern const uint m68ki_shift_32_table[];
1013 extern const uint8 m68ki_exception_cycle_table[][256];
1014 extern uint m68ki_address_space;
1015 extern const uint8 m68ki_ea_idx_cycle_table[];
1017 extern uint m68ki_aerr_address;
1018 extern uint m68ki_aerr_write_mode;
1019 extern uint m68ki_aerr_fc;
1021 /* Forward declarations to keep some of the macros happy */
1022 static inline uint m68ki_read_16_fc (uint address, uint fc);
1023 static inline uint m68ki_read_32_fc (uint address, uint fc);
1024 static inline uint m68ki_get_ea_ix(uint An);
1025 static inline void m68ki_check_interrupts(void); /* ASG: check for interrupts */
1027 /* quick disassembly (used for logging) */
1028 char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type);
1031 /* ======================================================================== */
1032 /* =========================== UTILITY FUNCTIONS ========================== */
1033 /* ======================================================================== */
1036 /* ---------------------------- Read Immediate ---------------------------- */
1038 extern unsigned char read_ranges;
1039 extern unsigned int read_addr[8];
1040 extern unsigned int read_upper[8];
1041 extern unsigned char *read_data[8];
1042 extern unsigned char write_ranges;
1043 extern unsigned int write_addr[8];
1044 extern unsigned int write_upper[8];
1045 extern unsigned char *write_data[8];
1047 extern uint pmmu_translate_addr(uint addr_in);
1049 /* Handles all immediate reads, does address error check, function code setting,
1050 * and prefetching if they are enabled in m68kconf.h
1052 static inline uint m68ki_read_imm_16(void)
1054 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1055 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1057 #if M68K_SEPARATE_READS
1058 /*#if M68K_EMULATE_PMMU
1060 address = pmmu_translate_addr(ADDRESS_68K(CPU_PREF_ADDR));
1064 #if M68K_EMULATE_PREFETCH
1067 if(REG_PC != CPU_PREF_ADDR)
1069 CPU_PREF_ADDR = REG_PC;
1070 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1072 result = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1074 CPU_PREF_ADDR = REG_PC;
1075 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1080 uint32_t address = ADDRESS_68K(REG_PC);
1083 for (int i = 0; i < read_ranges; i++) {
1084 if(address >= read_addr[i] && address < read_upper[i]) {
1085 return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
1089 return m68k_read_immediate_16(ADDRESS_68K(REG_PC-2));
1090 #endif /* M68K_EMULATE_PREFETCH */
1093 static inline uint m68ki_read_imm_8(void)
1095 /* map read immediate 8 to read immediate 16 */
1096 return MASK_OUT_ABOVE_8(m68ki_read_imm_16());
1099 static inline uint m68ki_read_imm_32(void)
1101 #if M68K_SEPARATE_READS
1102 /*#if M68K_EMULATE_PMMU
1104 address = pmmu_translate_addr(ADDRESS_68K(CPU_PREF_ADDR));
1108 #if M68K_EMULATE_PREFETCH
1110 uint32_t address = ADDRESS_68K(CPU_PREF_ADDR);
1112 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1113 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1115 if(REG_PC != CPU_PREF_ADDR)
1117 CPU_PREF_ADDR = REG_PC;
1119 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1121 temp_val = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1123 CPU_PREF_ADDR = REG_PC;
1124 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1126 temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | MASK_OUT_ABOVE_16(CPU_PREF_DATA));
1128 CPU_PREF_ADDR = REG_PC;
1129 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1133 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1134 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1135 uint32_t address = ADDRESS_68K(REG_PC);
1137 for (int i = 0; i < read_ranges; i++) {
1138 if(address >= read_addr[i] && address < read_upper[i]) {
1139 return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
1143 return m68k_read_immediate_32(ADDRESS_68K(REG_PC-4));
1144 #endif /* M68K_EMULATE_PREFETCH */
1147 /* ------------------------- Top level read/write ------------------------- */
1149 /* Handles all memory accesses (except for immediate reads if they are
1150 * configured to use separate functions in m68kconf.h).
1151 * All memory accesses must go through these top level functions.
1152 * These functions will also check for address error and set the function
1153 * code if they are enabled in m68kconf.h.
1156 static inline uint m68ki_read_8_fc(uint address, uint fc)
1159 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1161 #if M68K_EMULATE_PMMU
1163 address = pmmu_translate_addr(address);
1166 for (int i = 0; i < read_ranges; i++) {
1167 if(address >= read_addr[i] && address < read_upper[i]) {
1168 return read_data[i][address - read_addr[i]];
1172 return m68k_read_memory_8(ADDRESS_68K(address));
1174 static inline uint m68ki_read_16_fc(uint address, uint fc)
1177 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1178 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1180 #if M68K_EMULATE_PMMU
1182 address = pmmu_translate_addr(address);
1185 for (int i = 0; i < read_ranges; i++) {
1186 if(address >= read_addr[i] && address < read_upper[i]) {
1187 return be16toh(((unsigned short *)(read_data[i] + (address - read_addr[i])))[0]);
1191 return m68k_read_memory_16(ADDRESS_68K(address));
1193 static inline uint m68ki_read_32_fc(uint address, uint fc)
1196 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1197 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1199 #if M68K_EMULATE_PMMU
1201 address = pmmu_translate_addr(address);
1204 for (int i = 0; i < read_ranges; i++) {
1205 if(address >= read_addr[i] && address < read_upper[i]) {
1206 return be32toh(((unsigned int *)(read_data[i] + (address - read_addr[i])))[0]);
1210 return m68k_read_memory_32(ADDRESS_68K(address));
1213 static inline void m68ki_write_8_fc(uint address, uint fc, uint value)
1216 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1218 #if M68K_EMULATE_PMMU
1220 address = pmmu_translate_addr(address);
1223 for (int i = 0; i < write_ranges; i++) {
1224 if(address >= write_addr[i] && address < write_upper[i]) {
1225 write_data[i][address - write_addr[i]] = (unsigned char)value;
1230 m68k_write_memory_8(ADDRESS_68K(address), value);
1232 static inline void m68ki_write_16_fc(uint address, uint fc, uint value)
1235 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1236 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1238 #if M68K_EMULATE_PMMU
1240 address = pmmu_translate_addr(address);
1243 for (int i = 0; i < write_ranges; i++) {
1244 if(address >= write_addr[i] && address < write_upper[i]) {
1245 ((short *)(write_data[i] + (address - write_addr[i])))[0] = htobe16(value);
1250 m68k_write_memory_16(ADDRESS_68K(address), value);
1252 static inline void m68ki_write_32_fc(uint address, uint fc, uint value)
1255 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1256 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1258 #if M68K_EMULATE_PMMU
1260 address = pmmu_translate_addr(address);
1263 for (int i = 0; i < write_ranges; i++) {
1264 if(address >= write_addr[i] && address < write_upper[i]) {
1265 ((int *)(write_data[i] + (address - write_addr[i])))[0] = htobe32(value);
1270 m68k_write_memory_32(ADDRESS_68K(address), value);
1273 #if M68K_SIMULATE_PD_WRITES
1274 static inline void m68ki_write_32_pd_fc(uint address, uint fc, uint value)
1277 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1278 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1280 #if M68K_EMULATE_PMMU
1282 address = pmmu_translate_addr(address);
1285 m68k_write_memory_32_pd(ADDRESS_68K(address), value);
1289 /* --------------------- Effective Address Calculation -------------------- */
1291 /* The program counter relative addressing modes cause operands to be
1292 * retrieved from program space, not data space.
1294 static inline uint m68ki_get_ea_pcdi(void)
1296 uint old_pc = REG_PC;
1297 m68ki_use_program_space(); /* auto-disable */
1298 return old_pc + MAKE_INT_16(m68ki_read_imm_16());
1302 static inline uint m68ki_get_ea_pcix(void)
1304 m68ki_use_program_space(); /* auto-disable */
1305 return m68ki_get_ea_ix(REG_PC);
1308 /* Indexed addressing modes are encoded as follows:
1310 * Base instruction format:
1311 * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0
1312 * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An)
1314 * Base instruction format for destination EA in move instructions:
1315 * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0
1316 * x x x x | BASE REG | 1 1 0 | X X X X X X (An)
1318 * Brief extension format:
1319 * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0
1320 * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT
1322 * Full extension format:
1323 * F E D C B A 9 8 7 6 5 4 3 2 1 0
1324 * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS
1325 * BASE DISPLACEMENT (0, 16, 32 bit) (bd)
1326 * OUTER DISPLACEMENT (0, 16, 32 bit) (od)
1328 * D/A: 0 = Dn, 1 = An (Xn)
1329 * W/L: 0 = W (sign extend), 1 = L (.SIZE)
1330 * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE)
1331 * BS: 0=add base reg, 1=suppress base reg (An suppressed)
1332 * IS: 0=add index, 1=suppress index (Xn suppressed)
1333 * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd)
1336 * 0 000 No Memory Indirect
1337 * 0 001 indir prex with null outer
1338 * 0 010 indir prex with word outer
1339 * 0 011 indir prex with long outer
1341 * 0 101 indir postx with null outer
1342 * 0 110 indir postx with word outer
1343 * 0 111 indir postx with long outer
1344 * 1 000 no memory indirect
1345 * 1 001 mem indir with null outer
1346 * 1 010 mem indir with word outer
1347 * 1 011 mem indir with long outer
1348 * 1 100-111 reserved
1350 static inline uint m68ki_get_ea_ix(uint An)
1352 /* An = base register */
1353 uint extension = m68ki_read_imm_16();
1354 uint Xn = 0; /* Index register */
1355 uint bd = 0; /* Base Displacement */
1356 uint od = 0; /* Outer Displacement */
1358 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1360 /* Calculate index */
1361 Xn = REG_DA[extension>>12]; /* Xn */
1362 if(!BIT_B(extension)) /* W/L */
1363 Xn = MAKE_INT_16(Xn);
1365 /* Add base register and displacement and return */
1366 return An + Xn + MAKE_INT_8(extension);
1369 /* Brief extension format */
1370 if(!BIT_8(extension))
1372 /* Calculate index */
1373 Xn = REG_DA[extension>>12]; /* Xn */
1374 if(!BIT_B(extension)) /* W/L */
1375 Xn = MAKE_INT_16(Xn);
1376 /* Add scale if proper CPU type */
1377 if(CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
1378 Xn <<= (extension>>9) & 3; /* SCALE */
1380 /* Add base register and displacement and return */
1381 return An + Xn + MAKE_INT_8(extension);
1384 /* Full extension format */
1386 USE_CYCLES(m68ki_ea_idx_cycle_table[extension&0x3f]);
1388 /* Check if base register is present */
1389 if(BIT_7(extension)) /* BS */
1392 /* Check if index is present */
1393 if(!BIT_6(extension)) /* IS */
1395 Xn = REG_DA[extension>>12]; /* Xn */
1396 if(!BIT_B(extension)) /* W/L */
1397 Xn = MAKE_INT_16(Xn);
1398 Xn <<= (extension>>9) & 3; /* SCALE */
1401 /* Check if base displacement is present */
1402 if(BIT_5(extension)) /* BD SIZE */
1403 bd = BIT_4(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1405 /* If no indirect action, we are done */
1406 if(!(extension&7)) /* No Memory Indirect */
1407 return An + bd + Xn;
1409 /* Check if outer displacement is present */
1410 if(BIT_1(extension)) /* I/IS: od */
1411 od = BIT_0(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1414 if(BIT_2(extension)) /* I/IS: 0 = preindex, 1 = postindex */
1415 return m68ki_read_32(An + bd) + Xn + od;
1418 return m68ki_read_32(An + bd + Xn) + od;
1422 /* Fetch operands */
1423 static inline uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); }
1424 static inline uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);}
1425 static inline uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);}
1426 static inline uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); }
1427 static inline uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);}
1428 static inline uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);}
1429 static inline uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); }
1430 static inline uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);}
1431 static inline uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);}
1432 static inline uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); }
1433 static inline uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);}
1434 static inline uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);}
1435 static inline uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); }
1436 static inline uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);}
1437 static inline uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);}
1439 static inline uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); }
1440 static inline uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);}
1441 static inline uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);}
1442 static inline uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); }
1443 static inline uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);}
1444 static inline uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);}
1445 static inline uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); }
1446 static inline uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);}
1447 static inline uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);}
1448 static inline uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); }
1449 static inline uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);}
1450 static inline uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);}
1451 static inline uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); }
1452 static inline uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);}
1453 static inline uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);}
1455 static inline uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); }
1456 static inline uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); }
1458 static inline uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); }
1459 static inline uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);}
1460 static inline uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);}
1461 static inline uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); }
1462 static inline uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);}
1463 static inline uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);}
1464 static inline uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); }
1465 static inline uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);}
1466 static inline uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);}
1467 static inline uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); }
1468 static inline uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);}
1469 static inline uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);}
1473 /* ---------------------------- Stack Functions --------------------------- */
1475 /* Push/pull data from the stack */
1476 static inline void m68ki_push_16(uint value)
1478 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1479 m68ki_write_16(REG_SP, value);
1482 static inline void m68ki_push_32(uint value)
1484 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1485 m68ki_write_32(REG_SP, value);
1488 static inline uint m68ki_pull_16(void)
1490 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1491 return m68ki_read_16(REG_SP-2);
1494 static inline uint m68ki_pull_32(void)
1496 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1497 return m68ki_read_32(REG_SP-4);
1501 /* Increment/decrement the stack as if doing a push/pull but
1502 * don't do any memory access.
1504 static inline void m68ki_fake_push_16(void)
1506 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1509 static inline void m68ki_fake_push_32(void)
1511 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1514 static inline void m68ki_fake_pull_16(void)
1516 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1519 static inline void m68ki_fake_pull_32(void)
1521 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1525 /* ----------------------------- Program Flow ----------------------------- */
1527 /* Jump to a new program location or vector.
1528 * These functions will also call the pc_changed callback if it was enabled
1531 static inline void m68ki_jump(uint new_pc)
1534 m68ki_pc_changed(REG_PC);
1537 static inline void m68ki_jump_vector(uint vector)
1539 REG_PC = (vector<<2) + REG_VBR;
1540 REG_PC = m68ki_read_data_32(REG_PC);
1541 m68ki_pc_changed(REG_PC);
1545 /* Branch to a new memory location.
1546 * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h.
1547 * So far I've found no problems with not calling pc_changed for 8 or 16
1550 static inline void m68ki_branch_8(uint offset)
1552 REG_PC += MAKE_INT_8(offset);
1555 static inline void m68ki_branch_16(uint offset)
1557 REG_PC += MAKE_INT_16(offset);
1560 static inline void m68ki_branch_32(uint offset)
1563 m68ki_pc_changed(REG_PC);
1566 /* ---------------------------- Status Register --------------------------- */
1568 /* Set the S flag and change the active stack pointer.
1569 * Note that value MUST be 4 or 0.
1571 static inline void m68ki_set_s_flag(uint value)
1573 /* Backup the old stack pointer */
1574 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1575 /* Set the S flag */
1577 /* Set the new stack pointer */
1578 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1581 /* Set the S and M flags and change the active stack pointer.
1582 * Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
1584 static inline void m68ki_set_sm_flag(uint value)
1586 /* Backup the old stack pointer */
1587 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1588 /* Set the S and M flags */
1589 FLAG_S = value & SFLAG_SET;
1590 FLAG_M = value & MFLAG_SET;
1591 /* Set the new stack pointer */
1592 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1595 /* Set the S and M flags. Don't touch the stack pointer. */
1596 static inline void m68ki_set_sm_flag_nosp(uint value)
1598 /* Set the S and M flags */
1599 FLAG_S = value & SFLAG_SET;
1600 FLAG_M = value & MFLAG_SET;
1604 /* Set the condition code register */
1605 static inline void m68ki_set_ccr(uint value)
1607 FLAG_X = BIT_4(value) << 4;
1608 FLAG_N = BIT_3(value) << 4;
1609 FLAG_Z = !BIT_2(value);
1610 FLAG_V = BIT_1(value) << 6;
1611 FLAG_C = BIT_0(value) << 8;
1614 /* Set the status register but don't check for interrupts */
1615 static inline void m68ki_set_sr_noint(uint value)
1617 /* Mask out the "unimplemented" bits */
1618 value &= CPU_SR_MASK;
1620 /* Now set the status register */
1621 FLAG_T1 = BIT_F(value);
1622 FLAG_T0 = BIT_E(value);
1623 FLAG_INT_MASK = value & 0x0700;
1624 m68ki_set_ccr(value);
1625 m68ki_set_sm_flag((value >> 11) & 6);
1628 /* Set the status register but don't check for interrupts nor
1629 * change the stack pointer
1631 static inline void m68ki_set_sr_noint_nosp(uint value)
1633 /* Mask out the "unimplemented" bits */
1634 value &= CPU_SR_MASK;
1636 /* Now set the status register */
1637 FLAG_T1 = BIT_F(value);
1638 FLAG_T0 = BIT_E(value);
1639 FLAG_INT_MASK = value & 0x0700;
1640 m68ki_set_ccr(value);
1641 m68ki_set_sm_flag_nosp((value >> 11) & 6);
1644 /* Set the status register and check for interrupts */
1645 static inline void m68ki_set_sr(uint value)
1647 m68ki_set_sr_noint(value);
1648 m68ki_check_interrupts();
1652 /* ------------------------- Exception Processing ------------------------- */
1654 /* Initiate exception processing */
1655 static inline uint m68ki_init_exception(void)
1657 /* Save the old status register */
1658 uint sr = m68ki_get_sr();
1660 /* Turn off trace flag, clear pending traces */
1661 FLAG_T1 = FLAG_T0 = 0;
1662 m68ki_clear_trace();
1663 /* Enter supervisor mode */
1664 m68ki_set_s_flag(SFLAG_SET);
1669 /* 3 word stack frame (68000 only) */
1670 static inline void m68ki_stack_frame_3word(uint pc, uint sr)
1676 /* Format 0 stack frame.
1677 * This is the standard stack frame for 68010+.
1679 static inline void m68ki_stack_frame_0000(uint pc, uint sr, uint vector)
1681 /* Stack a 3-word frame if we are 68000 */
1682 if(CPU_TYPE == CPU_TYPE_000)
1684 m68ki_stack_frame_3word(pc, sr);
1687 m68ki_push_16(vector<<2);
1692 /* Format 1 stack frame (68020).
1693 * For 68020, this is the 4 word throwaway frame.
1695 static inline void m68ki_stack_frame_0001(uint pc, uint sr, uint vector)
1697 m68ki_push_16(0x1000 | (vector<<2));
1702 /* Format 2 stack frame.
1703 * This is used only by 68020 for trap exceptions.
1705 static inline void m68ki_stack_frame_0010(uint sr, uint vector)
1707 m68ki_push_32(REG_PPC);
1708 m68ki_push_16(0x2000 | (vector<<2));
1709 m68ki_push_32(REG_PC);
1714 /* Bus error stack frame (68000 only).
1716 static inline void m68ki_stack_frame_buserr(uint sr)
1718 m68ki_push_32(REG_PC);
1720 m68ki_push_16(REG_IR);
1721 m68ki_push_32(m68ki_aerr_address); /* access address */
1722 /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC
1723 * R/W 0 = write, 1 = read
1724 * I/N 0 = instruction, 1 = not
1725 * FC 3-bit function code
1727 m68ki_push_16(m68ki_aerr_write_mode | CPU_INSTR_MODE | m68ki_aerr_fc);
1730 /* Format 8 stack frame (68010).
1731 * 68010 only. This is the 29 word bus/address error frame.
1733 static inline void m68ki_stack_frame_1000(uint pc, uint sr, uint vector)
1737 * INTERNAL INFORMATION, 16 WORDS
1739 m68ki_fake_push_32();
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();
1748 /* INSTRUCTION INPUT BUFFER */
1751 /* UNUSED, RESERVED (not written) */
1752 m68ki_fake_push_16();
1754 /* DATA INPUT BUFFER */
1757 /* UNUSED, RESERVED (not written) */
1758 m68ki_fake_push_16();
1760 /* DATA OUTPUT BUFFER */
1763 /* UNUSED, RESERVED (not written) */
1764 m68ki_fake_push_16();
1769 /* SPECIAL STATUS WORD */
1772 /* 1000, VECTOR OFFSET */
1773 m68ki_push_16(0x8000 | (vector<<2));
1775 /* PROGRAM COUNTER */
1778 /* STATUS REGISTER */
1782 /* Format A stack frame (short bus fault).
1783 * This is used only by 68020 for bus fault and address error
1784 * if the error happens at an instruction boundary.
1785 * PC stacked is address of next instruction.
1787 static inline void m68ki_stack_frame_1010(uint sr, uint vector, uint pc)
1789 /* INTERNAL REGISTER */
1792 /* INTERNAL REGISTER */
1795 /* DATA OUTPUT BUFFER (2 words) */
1798 /* INTERNAL REGISTER */
1801 /* INTERNAL REGISTER */
1804 /* DATA CYCLE FAULT ADDRESS (2 words) */
1807 /* INSTRUCTION PIPE STAGE B */
1810 /* INSTRUCTION PIPE STAGE C */
1813 /* SPECIAL STATUS REGISTER */
1816 /* INTERNAL REGISTER */
1819 /* 1010, VECTOR OFFSET */
1820 m68ki_push_16(0xa000 | (vector<<2));
1822 /* PROGRAM COUNTER */
1825 /* STATUS REGISTER */
1829 /* Format B stack frame (long bus fault).
1830 * This is used only by 68020 for bus fault and address error
1831 * if the error happens during instruction execution.
1832 * PC stacked is address of instruction in progress.
1834 static inline void m68ki_stack_frame_1011(uint sr, uint vector, uint pc)
1836 /* INTERNAL REGISTERS (18 words) */
1847 /* VERSION# (4 bits), INTERNAL INFORMATION */
1850 /* INTERNAL REGISTERS (3 words) */
1854 /* DATA INTPUT BUFFER (2 words) */
1857 /* INTERNAL REGISTERS (2 words) */
1860 /* STAGE B ADDRESS (2 words) */
1863 /* INTERNAL REGISTER (4 words) */
1867 /* DATA OUTPUT BUFFER (2 words) */
1870 /* INTERNAL REGISTER */
1873 /* INTERNAL REGISTER */
1876 /* DATA CYCLE FAULT ADDRESS (2 words) */
1879 /* INSTRUCTION PIPE STAGE B */
1882 /* INSTRUCTION PIPE STAGE C */
1885 /* SPECIAL STATUS REGISTER */
1888 /* INTERNAL REGISTER */
1891 /* 1011, VECTOR OFFSET */
1892 m68ki_push_16(0xb000 | (vector<<2));
1894 /* PROGRAM COUNTER */
1897 /* STATUS REGISTER */
1902 /* Used for Group 2 exceptions.
1903 * These stack a type 2 frame on the 020.
1905 static inline void m68ki_exception_trap(uint vector)
1907 uint sr = m68ki_init_exception();
1909 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1910 m68ki_stack_frame_0000(REG_PC, sr, vector);
1912 m68ki_stack_frame_0010(sr, vector);
1914 m68ki_jump_vector(vector);
1916 /* Use up some clock cycles and undo the instruction's cycles */
1917 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1920 /* Trap#n stacks a 0 frame but behaves like group2 otherwise */
1921 static inline void m68ki_exception_trapN(uint vector)
1923 uint sr = m68ki_init_exception();
1924 m68ki_stack_frame_0000(REG_PC, sr, vector);
1925 m68ki_jump_vector(vector);
1927 /* Use up some clock cycles and undo the instruction's cycles */
1928 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1931 /* Exception for trace mode */
1932 static inline void m68ki_exception_trace(void)
1934 uint sr = m68ki_init_exception();
1936 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1938 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1939 if(CPU_TYPE_IS_000(CPU_TYPE))
1941 CPU_INSTR_MODE = INSTRUCTION_NO;
1943 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1944 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_TRACE);
1947 m68ki_stack_frame_0010(sr, EXCEPTION_TRACE);
1949 m68ki_jump_vector(EXCEPTION_TRACE);
1951 /* Trace nullifies a STOP instruction */
1952 CPU_STOPPED &= ~STOP_LEVEL_STOP;
1954 /* Use up some clock cycles */
1955 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]);
1958 /* Exception for privilege violation */
1959 static inline void m68ki_exception_privilege_violation(void)
1961 uint sr = m68ki_init_exception();
1963 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1964 if(CPU_TYPE_IS_000(CPU_TYPE))
1966 CPU_INSTR_MODE = INSTRUCTION_NO;
1968 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1970 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_PRIVILEGE_VIOLATION);
1971 m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION);
1973 /* Use up some clock cycles and undo the instruction's cycles */
1974 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]);
1977 extern jmp_buf m68ki_bus_error_jmp_buf;
1979 #define m68ki_check_bus_error_trap() setjmp(m68ki_bus_error_jmp_buf)
1981 /* Exception for bus error */
1982 static inline void m68ki_exception_bus_error(void)
1986 /* If we were processing a bus error, address error, or reset,
1987 * this is a catastrophic failure.
1990 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
1992 m68k_read_memory_8(0x00ffff01);
1993 CPU_STOPPED = STOP_LEVEL_HALT;
1996 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
1998 /* Use up some clock cycles and undo the instruction's cycles */
1999 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_BUS_ERROR] - CYC_INSTRUCTION[REG_IR]);
2001 for (i = 15; i >= 0; i--){
2002 REG_DA[i] = REG_DA_SAVE[i];
2005 uint sr = m68ki_init_exception();
2006 m68ki_stack_frame_1000(REG_PPC, sr, EXCEPTION_BUS_ERROR);
2008 m68ki_jump_vector(EXCEPTION_BUS_ERROR);
2009 longjmp(m68ki_bus_error_jmp_buf, 1);
2012 extern int cpu_log_enabled;
2014 /* Exception for A-Line instructions */
2015 static inline void m68ki_exception_1010(void)
2018 #if M68K_LOG_1010_1111 == OPT_ON
2019 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1010 instruction %04x (%s)\n",
2020 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2021 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2024 sr = m68ki_init_exception();
2025 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1010);
2026 m68ki_jump_vector(EXCEPTION_1010);
2028 /* Use up some clock cycles and undo the instruction's cycles */
2029 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]);
2032 /* Exception for F-Line instructions */
2033 static inline void m68ki_exception_1111(void)
2037 #if M68K_LOG_1010_1111 == OPT_ON
2038 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1111 instruction %04x (%s)\n",
2039 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2040 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2043 sr = m68ki_init_exception();
2044 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1111);
2045 m68ki_jump_vector(EXCEPTION_1111);
2047 /* Use up some clock cycles and undo the instruction's cycles */
2048 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]);
2051 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
2052 extern int m68ki_illg_callback(int);
2055 /* Exception for illegal instructions */
2056 static inline void m68ki_exception_illegal(void)
2060 M68K_DO_LOG((M68K_LOG_FILEHANDLE "%s at %08x: illegal instruction %04x (%s)\n",
2061 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
2062 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
2063 if (m68ki_illg_callback(REG_IR))
2066 sr = m68ki_init_exception();
2068 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2069 if(CPU_TYPE_IS_000(CPU_TYPE))
2071 CPU_INSTR_MODE = INSTRUCTION_NO;
2073 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2075 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_ILLEGAL_INSTRUCTION);
2076 m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION);
2078 /* Use up some clock cycles and undo the instruction's cycles */
2079 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]);
2082 /* Exception for format errror in RTE */
2083 static inline void m68ki_exception_format_error(void)
2085 uint sr = m68ki_init_exception();
2086 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_FORMAT_ERROR);
2087 m68ki_jump_vector(EXCEPTION_FORMAT_ERROR);
2089 /* Use up some clock cycles and undo the instruction's cycles */
2090 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_FORMAT_ERROR] - CYC_INSTRUCTION[REG_IR]);
2093 /* Exception for address error */
2094 static inline void m68ki_exception_address_error(void)
2096 uint sr = m68ki_init_exception();
2098 /* If we were processing a bus error, address error, or reset,
2099 * this is a catastrophic failure.
2102 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
2104 m68k_read_memory_8(0x00ffff01);
2105 CPU_STOPPED = STOP_LEVEL_HALT;
2108 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
2110 /* Note: This is implemented for 68000 only! */
2111 m68ki_stack_frame_buserr(sr);
2113 m68ki_jump_vector(EXCEPTION_ADDRESS_ERROR);
2115 /* Use up some clock cycles. Note that we don't need to undo the
2116 instruction's cycles here as we've longjmp:ed directly from the
2117 instruction handler without passing the part of the excecute loop
2118 that deducts instruction cycles */
2119 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ADDRESS_ERROR]);
2123 /* Service an interrupt request and start exception processing */
2124 static inline void m68ki_exception_interrupt(uint int_level)
2130 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2131 if(CPU_TYPE_IS_000(CPU_TYPE))
2133 CPU_INSTR_MODE = INSTRUCTION_NO;
2135 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2137 /* Turn off the stopped state */
2138 CPU_STOPPED &= ~STOP_LEVEL_STOP;
2140 /* If we are halted, don't do anything */
2144 /* Acknowledge the interrupt */
2145 vector = m68ki_int_ack(int_level);
2147 /* Get the interrupt vector */
2148 if(vector == M68K_INT_ACK_AUTOVECTOR)
2149 /* Use the autovectors. This is the most commonly used implementation */
2150 vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level;
2151 else if(vector == M68K_INT_ACK_SPURIOUS)
2152 /* Called if no devices respond to the interrupt acknowledge */
2153 vector = EXCEPTION_SPURIOUS_INTERRUPT;
2154 else if(vector > 255)
2156 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: Interrupt acknowledge returned invalid vector $%x\n",
2157 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PC), vector));
2161 /* Start exception processing */
2162 sr = m68ki_init_exception();
2164 /* Set the interrupt mask to the level of the one being serviced */
2165 FLAG_INT_MASK = int_level<<8;
2167 /* Get the new PC */
2168 new_pc = m68ki_read_data_32((vector<<2) + REG_VBR);
2170 /* If vector is uninitialized, call the uninitialized interrupt vector */
2172 new_pc = m68ki_read_data_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2) + REG_VBR);
2174 /* Generate a stack frame */
2175 m68ki_stack_frame_0000(REG_PC, sr, vector);
2176 if(FLAG_M && CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
2178 /* Create throwaway frame */
2179 m68ki_set_sm_flag(FLAG_S); /* clear M */
2180 sr |= 0x2000; /* Same as SR in master stack frame except S is forced high */
2181 m68ki_stack_frame_0001(REG_PC, sr, vector);
2186 /* Defer cycle counting until later */
2187 USE_CYCLES(CYC_EXCEPTION[vector]);
2189 #if !M68K_EMULATE_INT_ACK
2190 /* Automatically clear IRQ if we are not using an acknowledge scheme */
2192 #endif /* M68K_EMULATE_INT_ACK */
2196 /* ASG: Check for interrupts */
2197 static inline void m68ki_check_interrupts(void)
2199 if(m68ki_cpu.nmi_pending)
2201 m68ki_cpu.nmi_pending = FALSE;
2202 m68ki_exception_interrupt(7);
2204 else if(CPU_INT_LEVEL > FLAG_INT_MASK)
2205 m68ki_exception_interrupt(CPU_INT_LEVEL>>8);
2210 /* ======================================================================== */
2211 /* ============================== END OF FILE ============================= */
2212 /* ======================================================================== */
2218 #endif /* M68KCPU__HEADER */