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
46 /* ======================================================================== */
47 /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */
48 /* ======================================================================== */
50 /* Check for > 32bit sizes */
51 #if UINT_MAX > 0xffffffff
52 #define M68K_INT_GT_32_BIT 1
54 #define M68K_INT_GT_32_BIT 0
57 /* Data types used in this emulation core */
69 typedef signed char sint8; /* ASG: changed from char to signed char */
70 typedef signed short sint16;
71 typedef signed int sint32; /* AWJ: changed from long to int */
72 typedef unsigned char uint8;
73 typedef unsigned short uint16;
74 typedef unsigned int uint32; /* AWJ: changed from long to int */
76 /* signed and unsigned int must be at least 32 bits wide */
77 typedef signed int sint;
78 typedef unsigned int uint;
82 typedef signed long long sint64;
83 typedef unsigned long long uint64;
85 typedef sint32 sint64;
86 typedef uint32 uint64;
87 #endif /* M68K_USE_64_BIT */
89 /* U64 and S64 are used to wrap long integer constants. */
91 #define U64(val) val##ULL
92 #define S64(val) val##LL
98 #include "softfloat/milieu.h"
99 #include "softfloat/softfloat.h"
102 /* Allow for architectures that don't have 8-bit sizes */
103 #if UCHAR_MAX == 0xff
104 #define MAKE_INT_8(A) (sint8)(A)
107 #define sint8 signed int
109 #define uint8 unsigned int
110 static inline sint MAKE_INT_8(uint value)
112 return (value & 0x80) ? value | ~0xff : value & 0xff;
114 #endif /* UCHAR_MAX == 0xff */
117 /* Allow for architectures that don't have 16-bit sizes */
118 #if USHRT_MAX == 0xffff
119 #define MAKE_INT_16(A) (sint16)(A)
122 #define sint16 signed int
124 #define uint16 unsigned int
125 static inline sint MAKE_INT_16(uint value)
127 return (value & 0x8000) ? value | ~0xffff : value & 0xffff;
129 #endif /* USHRT_MAX == 0xffff */
132 /* Allow for architectures that don't have 32-bit sizes */
133 #if UINT_MAX == 0xffffffff
134 #define MAKE_INT_32(A) (sint32)(A)
137 #define sint32 signed int
139 #define uint32 unsigned int
140 static inline sint MAKE_INT_32(uint value)
142 return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff;
144 #endif /* UINT_MAX == 0xffffffff */
149 /* ======================================================================== */
150 /* ============================ GENERAL DEFINES =========================== */
151 /* ======================================================================== */
153 /* Exception Vectors handled by emulation */
154 #define EXCEPTION_RESET 0
155 #define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */
156 #define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */
157 #define EXCEPTION_ILLEGAL_INSTRUCTION 4
158 #define EXCEPTION_ZERO_DIVIDE 5
159 #define EXCEPTION_CHK 6
160 #define EXCEPTION_TRAPV 7
161 #define EXCEPTION_PRIVILEGE_VIOLATION 8
162 #define EXCEPTION_TRACE 9
163 #define EXCEPTION_1010 10
164 #define EXCEPTION_1111 11
165 #define EXCEPTION_FORMAT_ERROR 14
166 #define EXCEPTION_UNINITIALIZED_INTERRUPT 15
167 #define EXCEPTION_SPURIOUS_INTERRUPT 24
168 #define EXCEPTION_INTERRUPT_AUTOVECTOR 24
169 #define EXCEPTION_TRAP_BASE 32
171 /* Function codes set by CPU during data/address bus activity */
172 #define FUNCTION_CODE_USER_DATA 1
173 #define FUNCTION_CODE_USER_PROGRAM 2
174 #define FUNCTION_CODE_SUPERVISOR_DATA 5
175 #define FUNCTION_CODE_SUPERVISOR_PROGRAM 6
176 #define FUNCTION_CODE_CPU_SPACE 7
178 /* CPU types for deciding what to emulate */
179 #define CPU_TYPE_000 (0x00000001)
180 #define CPU_TYPE_008 (0x00000002)
181 #define CPU_TYPE_010 (0x00000004)
182 #define CPU_TYPE_EC020 (0x00000008)
183 #define CPU_TYPE_020 (0x00000010)
184 #define CPU_TYPE_EC030 (0x00000020)
185 #define CPU_TYPE_030 (0x00000040)
186 #define CPU_TYPE_EC040 (0x00000080)
187 #define CPU_TYPE_LC040 (0x00000100)
188 #define CPU_TYPE_040 (0x00000200)
189 #define CPU_TYPE_SCC070 (0x00000400)
191 /* Different ways to stop the CPU */
192 #define STOP_LEVEL_STOP 1
193 #define STOP_LEVEL_HALT 2
195 /* Used for 68000 address error processing */
196 #define INSTRUCTION_YES 0
197 #define INSTRUCTION_NO 0x08
198 #define MODE_READ 0x10
201 #define RUN_MODE_NORMAL 0
202 #define RUN_MODE_BERR_AERR_RESET 1
205 #define NULL ((void*)0)
208 /* ======================================================================== */
209 /* ================================ MACROS ================================ */
210 /* ======================================================================== */
213 /* ---------------------------- General Macros ---------------------------- */
215 /* Bit Isolation Macros */
216 #define BIT_0(A) ((A) & 0x00000001)
217 #define BIT_1(A) ((A) & 0x00000002)
218 #define BIT_2(A) ((A) & 0x00000004)
219 #define BIT_3(A) ((A) & 0x00000008)
220 #define BIT_4(A) ((A) & 0x00000010)
221 #define BIT_5(A) ((A) & 0x00000020)
222 #define BIT_6(A) ((A) & 0x00000040)
223 #define BIT_7(A) ((A) & 0x00000080)
224 #define BIT_8(A) ((A) & 0x00000100)
225 #define BIT_9(A) ((A) & 0x00000200)
226 #define BIT_A(A) ((A) & 0x00000400)
227 #define BIT_B(A) ((A) & 0x00000800)
228 #define BIT_C(A) ((A) & 0x00001000)
229 #define BIT_D(A) ((A) & 0x00002000)
230 #define BIT_E(A) ((A) & 0x00004000)
231 #define BIT_F(A) ((A) & 0x00008000)
232 #define BIT_10(A) ((A) & 0x00010000)
233 #define BIT_11(A) ((A) & 0x00020000)
234 #define BIT_12(A) ((A) & 0x00040000)
235 #define BIT_13(A) ((A) & 0x00080000)
236 #define BIT_14(A) ((A) & 0x00100000)
237 #define BIT_15(A) ((A) & 0x00200000)
238 #define BIT_16(A) ((A) & 0x00400000)
239 #define BIT_17(A) ((A) & 0x00800000)
240 #define BIT_18(A) ((A) & 0x01000000)
241 #define BIT_19(A) ((A) & 0x02000000)
242 #define BIT_1A(A) ((A) & 0x04000000)
243 #define BIT_1B(A) ((A) & 0x08000000)
244 #define BIT_1C(A) ((A) & 0x10000000)
245 #define BIT_1D(A) ((A) & 0x20000000)
246 #define BIT_1E(A) ((A) & 0x40000000)
247 #define BIT_1F(A) ((A) & 0x80000000)
249 /* Get the most significant bit for specific sizes */
250 #define GET_MSB_8(A) ((A) & 0x80)
251 #define GET_MSB_9(A) ((A) & 0x100)
252 #define GET_MSB_16(A) ((A) & 0x8000)
253 #define GET_MSB_17(A) ((A) & 0x10000)
254 #define GET_MSB_32(A) ((A) & 0x80000000)
256 #define GET_MSB_33(A) ((A) & 0x100000000)
257 #endif /* M68K_USE_64_BIT */
259 /* Isolate nibbles */
260 #define LOW_NIBBLE(A) ((A) & 0x0f)
261 #define HIGH_NIBBLE(A) ((A) & 0xf0)
263 /* These are used to isolate 8, 16, and 32 bit sizes */
264 #define MASK_OUT_ABOVE_2(A) ((A) & 3)
265 #define MASK_OUT_ABOVE_8(A) ((A) & 0xff)
266 #define MASK_OUT_ABOVE_16(A) ((A) & 0xffff)
267 #define MASK_OUT_BELOW_2(A) ((A) & ~3)
268 #define MASK_OUT_BELOW_8(A) ((A) & ~0xff)
269 #define MASK_OUT_BELOW_16(A) ((A) & ~0xffff)
271 /* No need to mask if we are 32 bit */
272 #if M68K_INT_GT_32_BIT || M68K_USE_64_BIT
273 #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff)
274 #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff)
276 #define MASK_OUT_ABOVE_32(A) (A)
277 #define MASK_OUT_BELOW_32(A) 0
278 #endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */
280 /* Simulate address lines of 68k family */
281 #define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK)
284 /* Shift & Rotate Macros. */
285 #define LSL(A, C) ((A) << (C))
286 #define LSR(A, C) ((A) >> (C))
288 /* Some > 32-bit optimizations */
289 #if M68K_INT_GT_32_BIT
290 /* Shift left and right */
291 #define LSR_32(A, C) ((A) >> (C))
292 #define LSL_32(A, C) ((A) << (C))
294 /* We have to do this because the morons at ANSI decided that shifts
295 * by >= data size are undefined.
297 #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0)
298 #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0)
299 #endif /* M68K_INT_GT_32_BIT */
302 #define LSL_32_64(A, C) ((A) << (C))
303 #define LSR_32_64(A, C) ((A) >> (C))
304 #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C)))
305 #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C)))
306 #endif /* M68K_USE_64_BIT */
308 #define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C)))
309 #define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C)))
310 #define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C)))
311 #define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C)))
312 #define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C)))
313 #define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C)))
315 #define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C)))
316 #define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C)))
317 #define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C)))
318 #define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C)))
319 #define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C)))
320 #define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C)))
324 /* ------------------------------ CPU Access ------------------------------ */
326 /* Access the CPU registers */
327 #define CPU_TYPE m68ki_cpu.cpu_type
329 #define REG_DA m68ki_cpu.dar /* easy access to data and address regs */
330 #define REG_DA_SAVE m68ki_cpu.dar_save
331 #define REG_D m68ki_cpu.dar
332 #define REG_A (m68ki_cpu.dar+8)
333 #define REG_PPC m68ki_cpu.ppc
334 #define REG_PC m68ki_cpu.pc
335 #define REG_SP_BASE m68ki_cpu.sp
336 #define REG_USP m68ki_cpu.sp[0]
337 #define REG_ISP m68ki_cpu.sp[4]
338 #define REG_MSP m68ki_cpu.sp[6]
339 #define REG_SP m68ki_cpu.dar[15]
340 #define REG_VBR m68ki_cpu.vbr
341 #define REG_SFC m68ki_cpu.sfc
342 #define REG_DFC m68ki_cpu.dfc
343 #define REG_CACR m68ki_cpu.cacr
344 #define REG_CAAR m68ki_cpu.caar
345 #define REG_IR m68ki_cpu.ir
347 #define REG_FP m68ki_cpu.fpr
348 #define REG_FPCR m68ki_cpu.fpcr
349 #define REG_FPSR m68ki_cpu.fpsr
350 #define REG_FPIAR m68ki_cpu.fpiar
352 #define FLAG_T1 m68ki_cpu.t1_flag
353 #define FLAG_T0 m68ki_cpu.t0_flag
354 #define FLAG_S m68ki_cpu.s_flag
355 #define FLAG_M m68ki_cpu.m_flag
356 #define FLAG_X m68ki_cpu.x_flag
357 #define FLAG_N m68ki_cpu.n_flag
358 #define FLAG_Z m68ki_cpu.not_z_flag
359 #define FLAG_V m68ki_cpu.v_flag
360 #define FLAG_C m68ki_cpu.c_flag
361 #define FLAG_INT_MASK m68ki_cpu.int_mask
363 #define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */
364 #define CPU_STOPPED m68ki_cpu.stopped
365 #define CPU_PREF_ADDR m68ki_cpu.pref_addr
366 #define CPU_PREF_DATA m68ki_cpu.pref_data
367 #define CPU_ADDRESS_MASK m68ki_cpu.address_mask
368 #define CPU_SR_MASK m68ki_cpu.sr_mask
369 #define CPU_INSTR_MODE m68ki_cpu.instr_mode
370 #define CPU_RUN_MODE m68ki_cpu.run_mode
372 #define CYC_INSTRUCTION m68ki_cpu.cyc_instruction
373 #define CYC_EXCEPTION m68ki_cpu.cyc_exception
374 #define CYC_BCC_NOTAKE_B m68ki_cpu.cyc_bcc_notake_b
375 #define CYC_BCC_NOTAKE_W m68ki_cpu.cyc_bcc_notake_w
376 #define CYC_DBCC_F_NOEXP m68ki_cpu.cyc_dbcc_f_noexp
377 #define CYC_DBCC_F_EXP m68ki_cpu.cyc_dbcc_f_exp
378 #define CYC_SCC_R_TRUE m68ki_cpu.cyc_scc_r_true
379 #define CYC_MOVEM_W m68ki_cpu.cyc_movem_w
380 #define CYC_MOVEM_L m68ki_cpu.cyc_movem_l
381 #define CYC_SHIFT m68ki_cpu.cyc_shift
382 #define CYC_RESET m68ki_cpu.cyc_reset
383 #define HAS_PMMU m68ki_cpu.has_pmmu
384 #define PMMU_ENABLED m68ki_cpu.pmmu_enabled
385 #define RESET_CYCLES m68ki_cpu.reset_cycles
388 #define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback
389 #define CALLBACK_BKPT_ACK m68ki_cpu.bkpt_ack_callback
390 #define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback
391 #define CALLBACK_CMPILD_INSTR m68ki_cpu.cmpild_instr_callback
392 #define CALLBACK_RTE_INSTR m68ki_cpu.rte_instr_callback
393 #define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback
394 #define CALLBACK_ILLG_INSTR m68ki_cpu.illg_instr_callback
395 #define CALLBACK_PC_CHANGED m68ki_cpu.pc_changed_callback
396 #define CALLBACK_SET_FC m68ki_cpu.set_fc_callback
397 #define CALLBACK_INSTR_HOOK m68ki_cpu.instr_hook_callback
401 /* ----------------------------- Configuration ---------------------------- */
403 /* These defines are dependant on the configuration defines in m68kconf.h */
405 /* Disable certain comparisons if we're not using all CPU types */
407 #define CPU_TYPE_IS_040_PLUS(A) ((A) & (CPU_TYPE_040 | CPU_TYPE_EC040))
408 #define CPU_TYPE_IS_040_LESS(A) 1
410 #define CPU_TYPE_IS_040_PLUS(A) 0
411 #define CPU_TYPE_IS_040_LESS(A) 1
415 #define CPU_TYPE_IS_030_PLUS(A) ((A) & (CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
416 #define CPU_TYPE_IS_030_LESS(A) 1
418 #define CPU_TYPE_IS_030_PLUS(A) 0
419 #define CPU_TYPE_IS_030_LESS(A) 1
423 #define CPU_TYPE_IS_020_PLUS(A) ((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
424 #define CPU_TYPE_IS_020_LESS(A) 1
426 #define CPU_TYPE_IS_020_PLUS(A) 0
427 #define CPU_TYPE_IS_020_LESS(A) 1
430 #if M68K_EMULATE_EC020
431 #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))
432 #define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010 | CPU_TYPE_EC020))
434 #define CPU_TYPE_IS_EC020_PLUS(A) CPU_TYPE_IS_020_PLUS(A)
435 #define CPU_TYPE_IS_EC020_LESS(A) CPU_TYPE_IS_020_LESS(A)
439 #define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010)
440 #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))
441 #define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010))
443 #define CPU_TYPE_IS_010(A) 0
444 #define CPU_TYPE_IS_010_PLUS(A) CPU_TYPE_IS_EC020_PLUS(A)
445 #define CPU_TYPE_IS_010_LESS(A) CPU_TYPE_IS_EC020_LESS(A)
448 #if M68K_EMULATE_020 || M68K_EMULATE_EC020
449 #define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
451 #define CPU_TYPE_IS_020_VARIANT(A) 0
454 #if M68K_EMULATE_040 || M68K_EMULATE_020 || M68K_EMULATE_EC020 || M68K_EMULATE_010
455 #define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000)
457 #define CPU_TYPE_IS_000(A) 1
461 #if !M68K_SEPARATE_READS
462 #define m68k_read_immediate_16(A) m68ki_read_program_16(A)
463 #define m68k_read_immediate_32(A) m68ki_read_program_32(A)
465 #define m68k_read_pcrelative_8(A) m68ki_read_program_8(A)
466 #define m68k_read_pcrelative_16(A) m68ki_read_program_16(A)
467 #define m68k_read_pcrelative_32(A) m68ki_read_program_32(A)
468 #endif /* M68K_SEPARATE_READS */
471 /* Enable or disable callback functions */
472 #if M68K_EMULATE_INT_ACK
473 #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER
474 #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A)
476 #define m68ki_int_ack(A) CALLBACK_INT_ACK(A)
479 /* Default action is to used autovector mode, which is most common */
480 #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR
481 #endif /* M68K_EMULATE_INT_ACK */
483 #if M68K_EMULATE_BKPT_ACK
484 #if M68K_EMULATE_BKPT_ACK == OPT_SPECIFY_HANDLER
485 #define m68ki_bkpt_ack(A) M68K_BKPT_ACK_CALLBACK(A)
487 #define m68ki_bkpt_ack(A) CALLBACK_BKPT_ACK(A)
490 #define m68ki_bkpt_ack(A)
491 #endif /* M68K_EMULATE_BKPT_ACK */
493 #if M68K_EMULATE_RESET
494 #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER
495 #define m68ki_output_reset() M68K_RESET_CALLBACK()
497 #define m68ki_output_reset() CALLBACK_RESET_INSTR()
500 #define m68ki_output_reset()
501 #endif /* M68K_EMULATE_RESET */
503 #if M68K_CMPILD_HAS_CALLBACK
504 #if M68K_CMPILD_HAS_CALLBACK == OPT_SPECIFY_HANDLER
505 #define m68ki_cmpild_callback(v,r) M68K_CMPILD_CALLBACK(v,r)
507 #define m68ki_cmpild_callback(v,r) CALLBACK_CMPILD_INSTR(v,r)
510 #define m68ki_cmpild_callback(v,r)
511 #endif /* M68K_CMPILD_HAS_CALLBACK */
513 #if M68K_RTE_HAS_CALLBACK
514 #if M68K_RTE_HAS_CALLBACK == OPT_SPECIFY_HANDLER
515 #define m68ki_rte_callback() M68K_RTE_CALLBACK()
517 #define m68ki_rte_callback() CALLBACK_RTE_INSTR()
520 #define m68ki_rte_callback()
521 #endif /* M68K_RTE_HAS_CALLBACK */
523 #if M68K_TAS_HAS_CALLBACK
524 #if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER
525 #define m68ki_tas_callback() M68K_TAS_CALLBACK()
527 #define m68ki_tas_callback() CALLBACK_TAS_INSTR()
530 #define m68ki_tas_callback() 1
531 #endif /* M68K_TAS_HAS_CALLBACK */
533 #if M68K_ILLG_HAS_CALLBACK
534 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
535 #define m68ki_illg_callback(opcode) M68K_ILLG_CALLBACK(opcode)
537 #define m68ki_illg_callback(opcode) CALLBACK_ILLG_INSTR(opcode)
540 #define m68ki_illg_callback(opcode) 0 // Default is 0 = not handled, exception will occur
541 #endif /* M68K_ILLG_HAS_CALLBACK */
543 #if M68K_INSTRUCTION_HOOK
544 #if M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
545 #define m68ki_instr_hook(pc) M68K_INSTRUCTION_CALLBACK(pc)
547 #define m68ki_instr_hook(pc) CALLBACK_INSTR_HOOK(pc)
550 #define m68ki_instr_hook(pc)
551 #endif /* M68K_INSTRUCTION_HOOK */
554 #if M68K_MONITOR_PC == OPT_SPECIFY_HANDLER
555 #define m68ki_pc_changed(A) M68K_SET_PC_CALLBACK(ADDRESS_68K(A))
557 #define m68ki_pc_changed(A) CALLBACK_PC_CHANGED(ADDRESS_68K(A))
560 #define m68ki_pc_changed(A)
561 #endif /* M68K_MONITOR_PC */
564 /* Enable or disable function code emulation */
566 #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER
567 #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A)
569 #define m68ki_set_fc(A) CALLBACK_SET_FC(A)
571 #define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA
572 #define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM
573 #define m68ki_get_address_space() m68ki_address_space
575 #define m68ki_set_fc(A)
576 #define m68ki_use_data_space()
577 #define m68ki_use_program_space()
578 #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA
579 #endif /* M68K_EMULATE_FC */
582 /* Enable or disable trace emulation */
583 #if M68K_EMULATE_TRACE
584 /* Initiates trace checking before each instruction (t1) */
585 #define m68ki_trace_t1() m68ki_tracing = FLAG_T1
586 /* adds t0 to trace checking if we encounter change of flow */
587 #define m68ki_trace_t0() m68ki_tracing |= FLAG_T0
588 /* Clear all tracing */
589 #define m68ki_clear_trace() m68ki_tracing = 0
590 /* Cause a trace exception if we are tracing */
591 #define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace()
593 #define m68ki_trace_t1()
594 #define m68ki_trace_t0()
595 #define m68ki_clear_trace()
596 #define m68ki_exception_if_trace()
597 #endif /* M68K_EMULATE_TRACE */
602 #if M68K_EMULATE_ADDRESS_ERROR
605 /* sigjmp() on Mac OS X and *BSD in general saves signal contexts and is super-slow, use sigsetjmp() to tell it not to */
607 extern sigjmp_buf m68ki_aerr_trap;
608 #define m68ki_set_address_error_trap(m68k) \
609 if(sigsetjmp(m68ki_aerr_trap, 0) != 0) \
611 m68ki_exception_address_error(m68k); \
614 if (m68ki_remaining_cycles > 0) \
615 m68ki_remaining_cycles = 0; \
616 return m68ki_initial_cycles; \
620 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
623 m68ki_aerr_address = ADDR; \
624 m68ki_aerr_write_mode = WRITE_MODE; \
625 m68ki_aerr_fc = FC; \
626 siglongjmp(m68ki_aerr_trap, 1); \
629 extern jmp_buf m68ki_aerr_trap;
630 #define m68ki_set_address_error_trap() \
631 if(setjmp(m68ki_aerr_trap) != 0) \
633 m68ki_exception_address_error(); \
637 return m68ki_initial_cycles; \
639 /* ensure we don't re-enter execution loop after an
640 address error if there's no more cycles remaining */ \
641 if(GET_CYCLES() <= 0) \
643 /* return how many clocks we used */ \
644 return m68ki_initial_cycles - GET_CYCLES(); \
648 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
651 m68ki_aerr_address = ADDR; \
652 m68ki_aerr_write_mode = WRITE_MODE; \
653 m68ki_aerr_fc = FC; \
654 longjmp(m68ki_aerr_trap, 1); \
658 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC) \
659 if (CPU_TYPE_IS_010_LESS(CPU_TYPE)) \
661 m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
664 #define m68ki_set_address_error_trap()
665 #define m68ki_check_address_error(ADDR, WRITE_MODE, FC)
666 #define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC)
667 #endif /* M68K_ADDRESS_ERROR */
672 extern FILE* M68K_LOG_FILEHANDLE
673 extern const char *const m68ki_cpu_names[];
675 #define M68K_DO_LOG(A) if(M68K_LOG_FILEHANDLE) fprintf A
676 #if M68K_LOG_1010_1111
677 #define M68K_DO_LOG_EMU(A) if(M68K_LOG_FILEHANDLE) fprintf A
679 #define M68K_DO_LOG_EMU(A)
682 #define M68K_DO_LOG(A)
683 #define M68K_DO_LOG_EMU(A)
688 /* -------------------------- EA / Operand Access ------------------------- */
691 * The general instruction format follows this pattern:
692 * .... XXX. .... .YYY
693 * where XXX is register X and YYY is register Y
695 /* Data Register Isolation */
696 #define DX (REG_D[(REG_IR >> 9) & 7])
697 #define DY (REG_D[REG_IR & 7])
698 /* Address Register Isolation */
699 #define AX (REG_A[(REG_IR >> 9) & 7])
700 #define AY (REG_A[REG_IR & 7])
703 /* Effective Address Calculations */
704 #define EA_AY_AI_8() AY /* address register indirect */
705 #define EA_AY_AI_16() EA_AY_AI_8()
706 #define EA_AY_AI_32() EA_AY_AI_8()
707 #define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */
708 #define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */
709 #define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */
710 #define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */
711 #define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */
712 #define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */
713 #define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */
714 #define EA_AY_DI_16() EA_AY_DI_8()
715 #define EA_AY_DI_32() EA_AY_DI_8()
716 #define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */
717 #define EA_AY_IX_16() EA_AY_IX_8()
718 #define EA_AY_IX_32() EA_AY_IX_8()
720 #define EA_AX_AI_8() AX
721 #define EA_AX_AI_16() EA_AX_AI_8()
722 #define EA_AX_AI_32() EA_AX_AI_8()
723 #define EA_AX_PI_8() (AX++)
724 #define EA_AX_PI_16() ((AX+=2)-2)
725 #define EA_AX_PI_32() ((AX+=4)-4)
726 #define EA_AX_PD_8() (--AX)
727 #define EA_AX_PD_16() (AX-=2)
728 #define EA_AX_PD_32() (AX-=4)
729 #define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16()))
730 #define EA_AX_DI_16() EA_AX_DI_8()
731 #define EA_AX_DI_32() EA_AX_DI_8()
732 #define EA_AX_IX_8() m68ki_get_ea_ix(AX)
733 #define EA_AX_IX_16() EA_AX_IX_8()
734 #define EA_AX_IX_32() EA_AX_IX_8()
736 #define EA_A7_PI_8() ((REG_A[7]+=2)-2)
737 #define EA_A7_PD_8() (REG_A[7]-=2)
739 #define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */
740 #define EA_AW_16() EA_AW_8()
741 #define EA_AW_32() EA_AW_8()
742 #define EA_AL_8() m68ki_read_imm_32() /* absolute long */
743 #define EA_AL_16() EA_AL_8()
744 #define EA_AL_32() EA_AL_8()
745 #define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */
746 #define EA_PCDI_16() EA_PCDI_8()
747 #define EA_PCDI_32() EA_PCDI_8()
748 #define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */
749 #define EA_PCIX_16() EA_PCIX_8()
750 #define EA_PCIX_32() EA_PCIX_8()
753 #define OPER_I_8() m68ki_read_imm_8()
754 #define OPER_I_16() m68ki_read_imm_16()
755 #define OPER_I_32() m68ki_read_imm_32()
759 /* --------------------------- Status Register ---------------------------- */
761 /* Flag Calculation Macros */
762 #define CFLAG_8(A) (A)
763 #define CFLAG_16(A) ((A)>>8)
765 #if M68K_INT_GT_32_BIT
766 #define CFLAG_ADD_32(S, D, R) ((R)>>24)
767 #define CFLAG_SUB_32(S, D, R) ((R)>>24)
769 #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23)
770 #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23)
771 #endif /* M68K_INT_GT_32_BIT */
773 #define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R))
774 #define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8)
775 #define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24)
777 #define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D))
778 #define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8)
779 #define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24)
781 #define NFLAG_8(A) (A)
782 #define NFLAG_16(A) ((A)>>8)
783 #define NFLAG_32(A) ((A)>>24)
784 #define NFLAG_64(A) ((A)>>56)
786 #define ZFLAG_8(A) MASK_OUT_ABOVE_8(A)
787 #define ZFLAG_16(A) MASK_OUT_ABOVE_16(A)
788 #define ZFLAG_32(A) MASK_OUT_ABOVE_32(A)
792 #define NFLAG_SET 0x80
793 #define NFLAG_CLEAR 0
794 #define CFLAG_SET 0x100
795 #define CFLAG_CLEAR 0
796 #define XFLAG_SET 0x100
797 #define XFLAG_CLEAR 0
798 #define VFLAG_SET 0x80
799 #define VFLAG_CLEAR 0
801 #define ZFLAG_CLEAR 0xffffffff
804 #define SFLAG_CLEAR 0
806 #define MFLAG_CLEAR 0
808 /* Turn flag values into 1 or 0 */
809 #define XFLAG_AS_1() ((FLAG_X>>8)&1)
810 #define NFLAG_AS_1() ((FLAG_N>>7)&1)
811 #define VFLAG_AS_1() ((FLAG_V>>7)&1)
812 #define ZFLAG_AS_1() (!FLAG_Z)
813 #define CFLAG_AS_1() ((FLAG_C>>8)&1)
817 #define COND_CS() (FLAG_C&0x100)
818 #define COND_CC() (!COND_CS())
819 #define COND_VS() (FLAG_V&0x80)
820 #define COND_VC() (!COND_VS())
821 #define COND_NE() FLAG_Z
822 #define COND_EQ() (!COND_NE())
823 #define COND_MI() (FLAG_N&0x80)
824 #define COND_PL() (!COND_MI())
825 #define COND_LT() ((FLAG_N^FLAG_V)&0x80)
826 #define COND_GE() (!COND_LT())
827 #define COND_HI() (COND_CC() && COND_NE())
828 #define COND_LS() (COND_CS() || COND_EQ())
829 #define COND_GT() (COND_GE() && COND_NE())
830 #define COND_LE() (COND_LT() || COND_EQ())
832 /* Reversed conditions */
833 #define COND_NOT_CS() COND_CC()
834 #define COND_NOT_CC() COND_CS()
835 #define COND_NOT_VS() COND_VC()
836 #define COND_NOT_VC() COND_VS()
837 #define COND_NOT_NE() COND_EQ()
838 #define COND_NOT_EQ() COND_NE()
839 #define COND_NOT_MI() COND_PL()
840 #define COND_NOT_PL() COND_MI()
841 #define COND_NOT_LT() COND_GE()
842 #define COND_NOT_GE() COND_LT()
843 #define COND_NOT_HI() COND_LS()
844 #define COND_NOT_LS() COND_HI()
845 #define COND_NOT_GT() COND_LE()
846 #define COND_NOT_LE() COND_GT()
848 /* Not real conditions, but here for convenience */
849 #define COND_XS() (FLAG_X&0x100)
850 #define COND_XC() (!COND_XS)
853 /* Get the condition code register */
854 #define m68ki_get_ccr() ((COND_XS() >> 4) | \
860 /* Get the status register */
861 #define m68ki_get_sr() ( FLAG_T1 | \
870 /* ---------------------------- Cycle Counting ---------------------------- */
872 #define ADD_CYCLES(A) m68ki_remaining_cycles += (A)
873 #define USE_CYCLES(A) m68ki_remaining_cycles -= (A)
874 #define SET_CYCLES(A) m68ki_remaining_cycles = A
875 #define GET_CYCLES() m68ki_remaining_cycles
876 #define USE_ALL_CYCLES() m68ki_remaining_cycles %= CYC_INSTRUCTION[REG_IR]
880 /* ----------------------------- Read / Write ----------------------------- */
882 /* Read from the current address space */
883 #define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space())
884 #define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space())
885 #define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space())
887 /* Write to the current data space */
888 #define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
889 #define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
890 #define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
892 #if M68K_SIMULATE_PD_WRITES
893 #define m68ki_write_32_pd(A, V) m68ki_write_32_pd_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
895 #define m68ki_write_32_pd(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
898 /* Map PC-relative reads */
899 #define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A)
900 #define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A)
901 #define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A)
903 /* Read from the program space */
904 #define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
905 #define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
906 #define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
908 /* Read from the data space */
909 #define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
910 #define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
911 #define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
915 /* ======================================================================== */
916 /* =============================== PROTOTYPES ============================= */
917 /* ======================================================================== */
927 uint cpu_type; /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */
928 uint dar[16]; /* Data and Address Registers */
929 uint dar_save[16]; /* Saved Data and Address Registers (pushed onto the
930 stack when a bus error occurs)*/
931 uint ppc; /* Previous program counter */
932 uint pc; /* Program Counter */
933 uint sp[7]; /* User, Interrupt, and Master Stack Pointers */
934 uint vbr; /* Vector Base Register (m68010+) */
935 uint sfc; /* Source Function Code Register (m68010+) */
936 uint dfc; /* Destination Function Code Register (m68010+) */
937 uint cacr; /* Cache Control Register (m68020, unemulated) */
938 uint caar; /* Cache Address Register (m68020, unemulated) */
939 uint ir; /* Instruction Register */
940 floatx80 fpr[8]; /* FPU Data Register (m68030/040) */
941 uint fpiar; /* FPU Instruction Address Register (m68040) */
942 uint fpsr; /* FPU Status Register (m68040) */
943 uint fpcr; /* FPU Control Register (m68040) */
944 uint t1_flag; /* Trace 1 */
945 uint t0_flag; /* Trace 0 */
946 uint s_flag; /* Supervisor */
947 uint m_flag; /* Master/Interrupt state */
948 uint x_flag; /* Extend */
949 uint n_flag; /* Negative */
950 uint not_z_flag; /* Zero, inverted for speedups */
951 uint v_flag; /* Overflow */
952 uint c_flag; /* Carry */
953 uint int_mask; /* I0-I2 */
954 uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */
955 uint stopped; /* Stopped state */
956 uint pref_addr; /* Last prefetch address */
957 uint pref_data; /* Data in the prefetch queue */
958 uint address_mask; /* Available address pins */
959 uint sr_mask; /* Implemented status register bits */
960 uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */
961 uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */
962 int has_pmmu; /* Indicates if a PMMU available (yes on 030, 040, no on EC030) */
963 int pmmu_enabled; /* Indicates if the PMMU is enabled */
964 int fpu_just_reset; /* Indicates the FPU was just reset */
967 /* Clocks required for instructions / exceptions */
968 uint cyc_bcc_notake_b;
969 uint cyc_bcc_notake_w;
970 uint cyc_dbcc_f_noexp;
978 /* Virtual IRQ lines state */
983 uint mmu_crp_aptr, mmu_crp_limit;
984 uint mmu_srp_aptr, mmu_srp_limit;
988 const uint8* cyc_instruction;
989 const uint8* cyc_exception;
991 /* Callbacks to host */
992 int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
993 void (*bkpt_ack_callback)(unsigned int data); /* Breakpoint Acknowledge */
994 void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
995 void (*cmpild_instr_callback)(unsigned int, int); /* Called when a CMPI.L #v, Dn instruction is encountered */
996 void (*rte_instr_callback)(void); /* Called when a RTE instruction is encountered */
997 int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */
998 int (*illg_instr_callback)(int); /* Called when an illegal instruction is encountered, allows handling */
999 void (*pc_changed_callback)(unsigned int new_pc); /* Called when the PC changes by a large amount */
1000 void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */
1001 void (*instr_hook_callback)(unsigned int pc); /* Called every instruction cycle prior to execution */
1006 extern m68ki_cpu_core m68ki_cpu;
1007 extern sint m68ki_remaining_cycles;
1008 extern uint m68ki_tracing;
1009 extern const uint8 m68ki_shift_8_table[];
1010 extern const uint16 m68ki_shift_16_table[];
1011 extern const uint m68ki_shift_32_table[];
1012 extern const uint8 m68ki_exception_cycle_table[][256];
1013 extern uint m68ki_address_space;
1014 extern const uint8 m68ki_ea_idx_cycle_table[];
1016 extern uint m68ki_aerr_address;
1017 extern uint m68ki_aerr_write_mode;
1018 extern uint m68ki_aerr_fc;
1020 /* Forward declarations to keep some of the macros happy */
1021 static inline uint m68ki_read_16_fc (uint address, uint fc);
1022 static inline uint m68ki_read_32_fc (uint address, uint fc);
1023 static inline uint m68ki_get_ea_ix(uint An);
1024 static inline void m68ki_check_interrupts(void); /* ASG: check for interrupts */
1026 /* quick disassembly (used for logging) */
1027 char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type);
1030 /* ======================================================================== */
1031 /* =========================== UTILITY FUNCTIONS ========================== */
1032 /* ======================================================================== */
1035 /* ---------------------------- Read Immediate ---------------------------- */
1037 extern uint pmmu_translate_addr(uint addr_in);
1039 /* Handles all immediate reads, does address error check, function code setting,
1040 * and prefetching if they are enabled in m68kconf.h
1042 static inline uint m68ki_read_imm_16(void)
1044 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1045 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1047 #if M68K_SEPARATE_READS
1048 #if M68K_EMULATE_PMMU
1050 address = pmmu_translate_addr(address);
1054 #if M68K_EMULATE_PREFETCH
1057 if(REG_PC != CPU_PREF_ADDR)
1059 CPU_PREF_ADDR = REG_PC;
1060 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1062 result = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1064 CPU_PREF_ADDR = REG_PC;
1065 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1070 return m68k_read_immediate_16(ADDRESS_68K(REG_PC-2));
1071 #endif /* M68K_EMULATE_PREFETCH */
1074 static inline uint m68ki_read_imm_8(void)
1076 /* map read immediate 8 to read immediate 16 */
1077 return MASK_OUT_ABOVE_8(m68ki_read_imm_16());
1080 static inline uint m68ki_read_imm_32(void)
1082 #if M68K_SEPARATE_READS
1083 #if M68K_EMULATE_PMMU
1085 address = pmmu_translate_addr(address);
1089 #if M68K_EMULATE_PREFETCH
1092 m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1093 m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */
1095 if(REG_PC != CPU_PREF_ADDR)
1097 CPU_PREF_ADDR = REG_PC;
1098 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1100 temp_val = MASK_OUT_ABOVE_16(CPU_PREF_DATA);
1102 CPU_PREF_ADDR = REG_PC;
1103 CPU_PREF_DATA = m68k_read_immediate_16(ADDRESS_68K(CPU_PREF_ADDR));
1105 temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | MASK_OUT_ABOVE_16(CPU_PREF_DATA));
1107 CPU_PREF_ADDR = REG_PC;
1108 CPU_PREF_DATA = m68k_read_immediate_16(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 return m68k_read_immediate_32(ADDRESS_68K(REG_PC-4));
1116 #endif /* M68K_EMULATE_PREFETCH */
1119 /* ------------------------- Top level read/write ------------------------- */
1121 /* Handles all memory accesses (except for immediate reads if they are
1122 * configured to use separate functions in m68kconf.h).
1123 * All memory accesses must go through these top level functions.
1124 * These functions will also check for address error and set the function
1125 * code if they are enabled in m68kconf.h.
1127 static inline uint m68ki_read_8_fc(uint address, uint fc)
1130 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1132 #if M68K_EMULATE_PMMU
1134 address = pmmu_translate_addr(address);
1137 return m68k_read_memory_8(ADDRESS_68K(address));
1139 static inline uint m68ki_read_16_fc(uint address, uint fc)
1142 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1143 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1145 #if M68K_EMULATE_PMMU
1147 address = pmmu_translate_addr(address);
1150 return m68k_read_memory_16(ADDRESS_68K(address));
1152 static inline uint m68ki_read_32_fc(uint address, uint fc)
1155 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1156 m68ki_check_address_error_010_less(address, MODE_READ, fc); /* auto-disable (see m68kcpu.h) */
1158 #if M68K_EMULATE_PMMU
1160 address = pmmu_translate_addr(address);
1163 return m68k_read_memory_32(ADDRESS_68K(address));
1166 static inline void m68ki_write_8_fc(uint address, uint fc, uint value)
1169 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1171 #if M68K_EMULATE_PMMU
1173 address = pmmu_translate_addr(address);
1176 m68k_write_memory_8(ADDRESS_68K(address), value);
1178 static inline void m68ki_write_16_fc(uint address, uint fc, uint value)
1181 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1182 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1184 #if M68K_EMULATE_PMMU
1186 address = pmmu_translate_addr(address);
1189 m68k_write_memory_16(ADDRESS_68K(address), value);
1191 static inline void m68ki_write_32_fc(uint address, uint fc, uint value)
1194 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1195 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1197 #if M68K_EMULATE_PMMU
1199 address = pmmu_translate_addr(address);
1202 m68k_write_memory_32(ADDRESS_68K(address), value);
1205 #if M68K_SIMULATE_PD_WRITES
1206 static inline void m68ki_write_32_pd_fc(uint address, uint fc, uint value)
1209 m68ki_set_fc(fc); /* auto-disable (see m68kcpu.h) */
1210 m68ki_check_address_error_010_less(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */
1212 #if M68K_EMULATE_PMMU
1214 address = pmmu_translate_addr(address);
1217 m68k_write_memory_32_pd(ADDRESS_68K(address), value);
1221 /* --------------------- Effective Address Calculation -------------------- */
1223 /* The program counter relative addressing modes cause operands to be
1224 * retrieved from program space, not data space.
1226 static inline uint m68ki_get_ea_pcdi(void)
1228 uint old_pc = REG_PC;
1229 m68ki_use_program_space(); /* auto-disable */
1230 return old_pc + MAKE_INT_16(m68ki_read_imm_16());
1234 static inline uint m68ki_get_ea_pcix(void)
1236 m68ki_use_program_space(); /* auto-disable */
1237 return m68ki_get_ea_ix(REG_PC);
1240 /* Indexed addressing modes are encoded as follows:
1242 * Base instruction format:
1243 * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0
1244 * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An)
1246 * Base instruction format for destination EA in move instructions:
1247 * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0
1248 * x x x x | BASE REG | 1 1 0 | X X X X X X (An)
1250 * Brief extension format:
1251 * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0
1252 * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT
1254 * Full extension format:
1255 * F E D C B A 9 8 7 6 5 4 3 2 1 0
1256 * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS
1257 * BASE DISPLACEMENT (0, 16, 32 bit) (bd)
1258 * OUTER DISPLACEMENT (0, 16, 32 bit) (od)
1260 * D/A: 0 = Dn, 1 = An (Xn)
1261 * W/L: 0 = W (sign extend), 1 = L (.SIZE)
1262 * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE)
1263 * BS: 0=add base reg, 1=suppress base reg (An suppressed)
1264 * IS: 0=add index, 1=suppress index (Xn suppressed)
1265 * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd)
1268 * 0 000 No Memory Indirect
1269 * 0 001 indir prex with null outer
1270 * 0 010 indir prex with word outer
1271 * 0 011 indir prex with long outer
1273 * 0 101 indir postx with null outer
1274 * 0 110 indir postx with word outer
1275 * 0 111 indir postx with long outer
1276 * 1 000 no memory indirect
1277 * 1 001 mem indir with null outer
1278 * 1 010 mem indir with word outer
1279 * 1 011 mem indir with long outer
1280 * 1 100-111 reserved
1282 static inline uint m68ki_get_ea_ix(uint An)
1284 /* An = base register */
1285 uint extension = m68ki_read_imm_16();
1286 uint Xn = 0; /* Index register */
1287 uint bd = 0; /* Base Displacement */
1288 uint od = 0; /* Outer Displacement */
1290 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1292 /* Calculate index */
1293 Xn = REG_DA[extension>>12]; /* Xn */
1294 if(!BIT_B(extension)) /* W/L */
1295 Xn = MAKE_INT_16(Xn);
1297 /* Add base register and displacement and return */
1298 return An + Xn + MAKE_INT_8(extension);
1301 /* Brief extension format */
1302 if(!BIT_8(extension))
1304 /* Calculate index */
1305 Xn = REG_DA[extension>>12]; /* Xn */
1306 if(!BIT_B(extension)) /* W/L */
1307 Xn = MAKE_INT_16(Xn);
1308 /* Add scale if proper CPU type */
1309 if(CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
1310 Xn <<= (extension>>9) & 3; /* SCALE */
1312 /* Add base register and displacement and return */
1313 return An + Xn + MAKE_INT_8(extension);
1316 /* Full extension format */
1318 USE_CYCLES(m68ki_ea_idx_cycle_table[extension&0x3f]);
1320 /* Check if base register is present */
1321 if(BIT_7(extension)) /* BS */
1324 /* Check if index is present */
1325 if(!BIT_6(extension)) /* IS */
1327 Xn = REG_DA[extension>>12]; /* Xn */
1328 if(!BIT_B(extension)) /* W/L */
1329 Xn = MAKE_INT_16(Xn);
1330 Xn <<= (extension>>9) & 3; /* SCALE */
1333 /* Check if base displacement is present */
1334 if(BIT_5(extension)) /* BD SIZE */
1335 bd = BIT_4(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1337 /* If no indirect action, we are done */
1338 if(!(extension&7)) /* No Memory Indirect */
1339 return An + bd + Xn;
1341 /* Check if outer displacement is present */
1342 if(BIT_1(extension)) /* I/IS: od */
1343 od = BIT_0(extension) ? m68ki_read_imm_32() : (uint32)MAKE_INT_16(m68ki_read_imm_16());
1346 if(BIT_2(extension)) /* I/IS: 0 = preindex, 1 = postindex */
1347 return m68ki_read_32(An + bd) + Xn + od;
1350 return m68ki_read_32(An + bd + Xn) + od;
1354 /* Fetch operands */
1355 static inline uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); }
1356 static inline uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);}
1357 static inline uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);}
1358 static inline uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); }
1359 static inline uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);}
1360 static inline uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);}
1361 static inline uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); }
1362 static inline uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);}
1363 static inline uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);}
1364 static inline uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); }
1365 static inline uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);}
1366 static inline uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);}
1367 static inline uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); }
1368 static inline uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);}
1369 static inline uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);}
1371 static inline uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); }
1372 static inline uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);}
1373 static inline uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);}
1374 static inline uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); }
1375 static inline uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);}
1376 static inline uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);}
1377 static inline uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); }
1378 static inline uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);}
1379 static inline uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);}
1380 static inline uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); }
1381 static inline uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);}
1382 static inline uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);}
1383 static inline uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); }
1384 static inline uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);}
1385 static inline uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);}
1387 static inline uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); }
1388 static inline uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); }
1390 static inline uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); }
1391 static inline uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);}
1392 static inline uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);}
1393 static inline uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); }
1394 static inline uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);}
1395 static inline uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);}
1396 static inline uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); }
1397 static inline uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);}
1398 static inline uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);}
1399 static inline uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); }
1400 static inline uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);}
1401 static inline uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);}
1405 /* ---------------------------- Stack Functions --------------------------- */
1407 /* Push/pull data from the stack */
1408 static inline void m68ki_push_16(uint value)
1410 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1411 m68ki_write_16(REG_SP, value);
1414 static inline void m68ki_push_32(uint value)
1416 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1417 m68ki_write_32(REG_SP, value);
1420 static inline uint m68ki_pull_16(void)
1422 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1423 return m68ki_read_16(REG_SP-2);
1426 static inline uint m68ki_pull_32(void)
1428 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1429 return m68ki_read_32(REG_SP-4);
1433 /* Increment/decrement the stack as if doing a push/pull but
1434 * don't do any memory access.
1436 static inline void m68ki_fake_push_16(void)
1438 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2);
1441 static inline void m68ki_fake_push_32(void)
1443 REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4);
1446 static inline void m68ki_fake_pull_16(void)
1448 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2);
1451 static inline void m68ki_fake_pull_32(void)
1453 REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4);
1457 /* ----------------------------- Program Flow ----------------------------- */
1459 /* Jump to a new program location or vector.
1460 * These functions will also call the pc_changed callback if it was enabled
1463 static inline void m68ki_jump(uint new_pc)
1466 m68ki_pc_changed(REG_PC);
1469 static inline void m68ki_jump_vector(uint vector)
1471 REG_PC = (vector<<2) + REG_VBR;
1472 REG_PC = m68ki_read_data_32(REG_PC);
1473 m68ki_pc_changed(REG_PC);
1477 /* Branch to a new memory location.
1478 * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h.
1479 * So far I've found no problems with not calling pc_changed for 8 or 16
1482 static inline void m68ki_branch_8(uint offset)
1484 REG_PC += MAKE_INT_8(offset);
1487 static inline void m68ki_branch_16(uint offset)
1489 REG_PC += MAKE_INT_16(offset);
1492 static inline void m68ki_branch_32(uint offset)
1495 m68ki_pc_changed(REG_PC);
1498 /* ---------------------------- Status Register --------------------------- */
1500 /* Set the S flag and change the active stack pointer.
1501 * Note that value MUST be 4 or 0.
1503 static inline void m68ki_set_s_flag(uint value)
1505 /* Backup the old stack pointer */
1506 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1507 /* Set the S flag */
1509 /* Set the new stack pointer */
1510 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1513 /* Set the S and M flags and change the active stack pointer.
1514 * Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M).
1516 static inline void m68ki_set_sm_flag(uint value)
1518 /* Backup the old stack pointer */
1519 REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)] = REG_SP;
1520 /* Set the S and M flags */
1521 FLAG_S = value & SFLAG_SET;
1522 FLAG_M = value & MFLAG_SET;
1523 /* Set the new stack pointer */
1524 REG_SP = REG_SP_BASE[FLAG_S | ((FLAG_S>>1) & FLAG_M)];
1527 /* Set the S and M flags. Don't touch the stack pointer. */
1528 static inline void m68ki_set_sm_flag_nosp(uint value)
1530 /* Set the S and M flags */
1531 FLAG_S = value & SFLAG_SET;
1532 FLAG_M = value & MFLAG_SET;
1536 /* Set the condition code register */
1537 static inline void m68ki_set_ccr(uint value)
1539 FLAG_X = BIT_4(value) << 4;
1540 FLAG_N = BIT_3(value) << 4;
1541 FLAG_Z = !BIT_2(value);
1542 FLAG_V = BIT_1(value) << 6;
1543 FLAG_C = BIT_0(value) << 8;
1546 /* Set the status register but don't check for interrupts */
1547 static inline void m68ki_set_sr_noint(uint value)
1549 /* Mask out the "unimplemented" bits */
1550 value &= CPU_SR_MASK;
1552 /* Now set the status register */
1553 FLAG_T1 = BIT_F(value);
1554 FLAG_T0 = BIT_E(value);
1555 FLAG_INT_MASK = value & 0x0700;
1556 m68ki_set_ccr(value);
1557 m68ki_set_sm_flag((value >> 11) & 6);
1560 /* Set the status register but don't check for interrupts nor
1561 * change the stack pointer
1563 static inline void m68ki_set_sr_noint_nosp(uint value)
1565 /* Mask out the "unimplemented" bits */
1566 value &= CPU_SR_MASK;
1568 /* Now set the status register */
1569 FLAG_T1 = BIT_F(value);
1570 FLAG_T0 = BIT_E(value);
1571 FLAG_INT_MASK = value & 0x0700;
1572 m68ki_set_ccr(value);
1573 m68ki_set_sm_flag_nosp((value >> 11) & 6);
1576 /* Set the status register and check for interrupts */
1577 static inline void m68ki_set_sr(uint value)
1579 m68ki_set_sr_noint(value);
1580 m68ki_check_interrupts();
1584 /* ------------------------- Exception Processing ------------------------- */
1586 /* Initiate exception processing */
1587 static inline uint m68ki_init_exception(void)
1589 /* Save the old status register */
1590 uint sr = m68ki_get_sr();
1592 /* Turn off trace flag, clear pending traces */
1593 FLAG_T1 = FLAG_T0 = 0;
1594 m68ki_clear_trace();
1595 /* Enter supervisor mode */
1596 m68ki_set_s_flag(SFLAG_SET);
1601 /* 3 word stack frame (68000 only) */
1602 static inline void m68ki_stack_frame_3word(uint pc, uint sr)
1608 /* Format 0 stack frame.
1609 * This is the standard stack frame for 68010+.
1611 static inline void m68ki_stack_frame_0000(uint pc, uint sr, uint vector)
1613 /* Stack a 3-word frame if we are 68000 */
1614 if(CPU_TYPE == CPU_TYPE_000)
1616 m68ki_stack_frame_3word(pc, sr);
1619 m68ki_push_16(vector<<2);
1624 /* Format 1 stack frame (68020).
1625 * For 68020, this is the 4 word throwaway frame.
1627 static inline void m68ki_stack_frame_0001(uint pc, uint sr, uint vector)
1629 m68ki_push_16(0x1000 | (vector<<2));
1634 /* Format 2 stack frame.
1635 * This is used only by 68020 for trap exceptions.
1637 static inline void m68ki_stack_frame_0010(uint sr, uint vector)
1639 m68ki_push_32(REG_PPC);
1640 m68ki_push_16(0x2000 | (vector<<2));
1641 m68ki_push_32(REG_PC);
1646 /* Bus error stack frame (68000 only).
1648 static inline void m68ki_stack_frame_buserr(uint sr)
1650 m68ki_push_32(REG_PC);
1652 m68ki_push_16(REG_IR);
1653 m68ki_push_32(m68ki_aerr_address); /* access address */
1654 /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC
1655 * R/W 0 = write, 1 = read
1656 * I/N 0 = instruction, 1 = not
1657 * FC 3-bit function code
1659 m68ki_push_16(m68ki_aerr_write_mode | CPU_INSTR_MODE | m68ki_aerr_fc);
1662 /* Format 8 stack frame (68010).
1663 * 68010 only. This is the 29 word bus/address error frame.
1665 static inline void m68ki_stack_frame_1000(uint pc, uint sr, uint vector)
1669 * INTERNAL INFORMATION, 16 WORDS
1671 m68ki_fake_push_32();
1672 m68ki_fake_push_32();
1673 m68ki_fake_push_32();
1674 m68ki_fake_push_32();
1675 m68ki_fake_push_32();
1676 m68ki_fake_push_32();
1677 m68ki_fake_push_32();
1678 m68ki_fake_push_32();
1680 /* INSTRUCTION INPUT BUFFER */
1683 /* UNUSED, RESERVED (not written) */
1684 m68ki_fake_push_16();
1686 /* DATA INPUT BUFFER */
1689 /* UNUSED, RESERVED (not written) */
1690 m68ki_fake_push_16();
1692 /* DATA OUTPUT BUFFER */
1695 /* UNUSED, RESERVED (not written) */
1696 m68ki_fake_push_16();
1701 /* SPECIAL STATUS WORD */
1704 /* 1000, VECTOR OFFSET */
1705 m68ki_push_16(0x8000 | (vector<<2));
1707 /* PROGRAM COUNTER */
1710 /* STATUS REGISTER */
1714 /* Format A stack frame (short bus fault).
1715 * This is used only by 68020 for bus fault and address error
1716 * if the error happens at an instruction boundary.
1717 * PC stacked is address of next instruction.
1719 static inline void m68ki_stack_frame_1010(uint sr, uint vector, uint pc)
1721 /* INTERNAL REGISTER */
1724 /* INTERNAL REGISTER */
1727 /* DATA OUTPUT BUFFER (2 words) */
1730 /* INTERNAL REGISTER */
1733 /* INTERNAL REGISTER */
1736 /* DATA CYCLE FAULT ADDRESS (2 words) */
1739 /* INSTRUCTION PIPE STAGE B */
1742 /* INSTRUCTION PIPE STAGE C */
1745 /* SPECIAL STATUS REGISTER */
1748 /* INTERNAL REGISTER */
1751 /* 1010, VECTOR OFFSET */
1752 m68ki_push_16(0xa000 | (vector<<2));
1754 /* PROGRAM COUNTER */
1757 /* STATUS REGISTER */
1761 /* Format B stack frame (long bus fault).
1762 * This is used only by 68020 for bus fault and address error
1763 * if the error happens during instruction execution.
1764 * PC stacked is address of instruction in progress.
1766 static inline void m68ki_stack_frame_1011(uint sr, uint vector, uint pc)
1768 /* INTERNAL REGISTERS (18 words) */
1779 /* VERSION# (4 bits), INTERNAL INFORMATION */
1782 /* INTERNAL REGISTERS (3 words) */
1786 /* DATA INTPUT BUFFER (2 words) */
1789 /* INTERNAL REGISTERS (2 words) */
1792 /* STAGE B ADDRESS (2 words) */
1795 /* INTERNAL REGISTER (4 words) */
1799 /* DATA OUTPUT BUFFER (2 words) */
1802 /* INTERNAL REGISTER */
1805 /* INTERNAL REGISTER */
1808 /* DATA CYCLE FAULT ADDRESS (2 words) */
1811 /* INSTRUCTION PIPE STAGE B */
1814 /* INSTRUCTION PIPE STAGE C */
1817 /* SPECIAL STATUS REGISTER */
1820 /* INTERNAL REGISTER */
1823 /* 1011, VECTOR OFFSET */
1824 m68ki_push_16(0xb000 | (vector<<2));
1826 /* PROGRAM COUNTER */
1829 /* STATUS REGISTER */
1834 /* Used for Group 2 exceptions.
1835 * These stack a type 2 frame on the 020.
1837 static inline void m68ki_exception_trap(uint vector)
1839 uint sr = m68ki_init_exception();
1841 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1842 m68ki_stack_frame_0000(REG_PC, sr, vector);
1844 m68ki_stack_frame_0010(sr, vector);
1846 m68ki_jump_vector(vector);
1848 /* Use up some clock cycles and undo the instruction's cycles */
1849 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1852 /* Trap#n stacks a 0 frame but behaves like group2 otherwise */
1853 static inline void m68ki_exception_trapN(uint vector)
1855 uint sr = m68ki_init_exception();
1856 m68ki_stack_frame_0000(REG_PC, sr, vector);
1857 m68ki_jump_vector(vector);
1859 /* Use up some clock cycles and undo the instruction's cycles */
1860 USE_CYCLES(CYC_EXCEPTION[vector] - CYC_INSTRUCTION[REG_IR]);
1863 /* Exception for trace mode */
1864 static inline void m68ki_exception_trace(void)
1866 uint sr = m68ki_init_exception();
1868 if(CPU_TYPE_IS_010_LESS(CPU_TYPE))
1870 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1871 if(CPU_TYPE_IS_000(CPU_TYPE))
1873 CPU_INSTR_MODE = INSTRUCTION_NO;
1875 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1876 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_TRACE);
1879 m68ki_stack_frame_0010(sr, EXCEPTION_TRACE);
1881 m68ki_jump_vector(EXCEPTION_TRACE);
1883 /* Trace nullifies a STOP instruction */
1884 CPU_STOPPED &= ~STOP_LEVEL_STOP;
1886 /* Use up some clock cycles */
1887 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]);
1890 /* Exception for privilege violation */
1891 static inline void m68ki_exception_privilege_violation(void)
1893 uint sr = m68ki_init_exception();
1895 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
1896 if(CPU_TYPE_IS_000(CPU_TYPE))
1898 CPU_INSTR_MODE = INSTRUCTION_NO;
1900 #endif /* M68K_EMULATE_ADDRESS_ERROR */
1902 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_PRIVILEGE_VIOLATION);
1903 m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION);
1905 /* Use up some clock cycles and undo the instruction's cycles */
1906 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]);
1909 extern jmp_buf m68ki_bus_error_jmp_buf;
1911 #define m68ki_check_bus_error_trap() setjmp(m68ki_bus_error_jmp_buf)
1913 /* Exception for bus error */
1914 static inline void m68ki_exception_bus_error(void)
1918 /* If we were processing a bus error, address error, or reset,
1919 * this is a catastrophic failure.
1922 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
1924 m68k_read_memory_8(0x00ffff01);
1925 CPU_STOPPED = STOP_LEVEL_HALT;
1928 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
1930 /* Use up some clock cycles and undo the instruction's cycles */
1931 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_BUS_ERROR] - CYC_INSTRUCTION[REG_IR]);
1933 for (i = 15; i >= 0; i--){
1934 REG_DA[i] = REG_DA_SAVE[i];
1937 uint sr = m68ki_init_exception();
1938 m68ki_stack_frame_1000(REG_PPC, sr, EXCEPTION_BUS_ERROR);
1940 m68ki_jump_vector(EXCEPTION_BUS_ERROR);
1941 longjmp(m68ki_bus_error_jmp_buf, 1);
1944 extern int cpu_log_enabled;
1946 /* Exception for A-Line instructions */
1947 static inline void m68ki_exception_1010(void)
1950 #if M68K_LOG_1010_1111 == OPT_ON
1951 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1010 instruction %04x (%s)\n",
1952 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1953 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1956 sr = m68ki_init_exception();
1957 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1010);
1958 m68ki_jump_vector(EXCEPTION_1010);
1960 /* Use up some clock cycles and undo the instruction's cycles */
1961 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]);
1964 /* Exception for F-Line instructions */
1965 static inline void m68ki_exception_1111(void)
1969 #if M68K_LOG_1010_1111 == OPT_ON
1970 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: called 1111 instruction %04x (%s)\n",
1971 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1972 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1975 sr = m68ki_init_exception();
1976 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_1111);
1977 m68ki_jump_vector(EXCEPTION_1111);
1979 /* Use up some clock cycles and undo the instruction's cycles */
1980 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]);
1983 #if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
1984 extern int m68ki_illg_callback(int);
1987 /* Exception for illegal instructions */
1988 static inline void m68ki_exception_illegal(void)
1992 M68K_DO_LOG((M68K_LOG_FILEHANDLE "%s at %08x: illegal instruction %04x (%s)\n",
1993 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PPC), REG_IR,
1994 m68ki_disassemble_quick(ADDRESS_68K(REG_PPC))));
1995 if (m68ki_illg_callback(REG_IR))
1998 sr = m68ki_init_exception();
2000 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2001 if(CPU_TYPE_IS_000(CPU_TYPE))
2003 CPU_INSTR_MODE = INSTRUCTION_NO;
2005 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2007 m68ki_stack_frame_0000(REG_PPC, sr, EXCEPTION_ILLEGAL_INSTRUCTION);
2008 m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION);
2010 /* Use up some clock cycles and undo the instruction's cycles */
2011 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]);
2014 /* Exception for format errror in RTE */
2015 static inline void m68ki_exception_format_error(void)
2017 uint sr = m68ki_init_exception();
2018 m68ki_stack_frame_0000(REG_PC, sr, EXCEPTION_FORMAT_ERROR);
2019 m68ki_jump_vector(EXCEPTION_FORMAT_ERROR);
2021 /* Use up some clock cycles and undo the instruction's cycles */
2022 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_FORMAT_ERROR] - CYC_INSTRUCTION[REG_IR]);
2025 /* Exception for address error */
2026 static inline void m68ki_exception_address_error(void)
2028 uint sr = m68ki_init_exception();
2030 /* If we were processing a bus error, address error, or reset,
2031 * this is a catastrophic failure.
2034 if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET)
2036 m68k_read_memory_8(0x00ffff01);
2037 CPU_STOPPED = STOP_LEVEL_HALT;
2040 CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET;
2042 /* Note: This is implemented for 68000 only! */
2043 m68ki_stack_frame_buserr(sr);
2045 m68ki_jump_vector(EXCEPTION_ADDRESS_ERROR);
2047 /* Use up some clock cycles. Note that we don't need to undo the
2048 instruction's cycles here as we've longjmp:ed directly from the
2049 instruction handler without passing the part of the excecute loop
2050 that deducts instruction cycles */
2051 USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ADDRESS_ERROR]);
2055 /* Service an interrupt request and start exception processing */
2056 static inline void m68ki_exception_interrupt(uint int_level)
2062 #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON
2063 if(CPU_TYPE_IS_000(CPU_TYPE))
2065 CPU_INSTR_MODE = INSTRUCTION_NO;
2067 #endif /* M68K_EMULATE_ADDRESS_ERROR */
2069 /* Turn off the stopped state */
2070 CPU_STOPPED &= ~STOP_LEVEL_STOP;
2072 /* If we are halted, don't do anything */
2076 /* Acknowledge the interrupt */
2077 vector = m68ki_int_ack(int_level);
2079 /* Get the interrupt vector */
2080 if(vector == M68K_INT_ACK_AUTOVECTOR)
2081 /* Use the autovectors. This is the most commonly used implementation */
2082 vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level;
2083 else if(vector == M68K_INT_ACK_SPURIOUS)
2084 /* Called if no devices respond to the interrupt acknowledge */
2085 vector = EXCEPTION_SPURIOUS_INTERRUPT;
2086 else if(vector > 255)
2088 M68K_DO_LOG_EMU((M68K_LOG_FILEHANDLE "%s at %08x: Interrupt acknowledge returned invalid vector $%x\n",
2089 m68ki_cpu_names[CPU_TYPE], ADDRESS_68K(REG_PC), vector));
2093 /* Start exception processing */
2094 sr = m68ki_init_exception();
2096 /* Set the interrupt mask to the level of the one being serviced */
2097 FLAG_INT_MASK = int_level<<8;
2099 /* Get the new PC */
2100 new_pc = m68ki_read_data_32((vector<<2) + REG_VBR);
2102 /* If vector is uninitialized, call the uninitialized interrupt vector */
2104 new_pc = m68ki_read_data_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2) + REG_VBR);
2106 /* Generate a stack frame */
2107 m68ki_stack_frame_0000(REG_PC, sr, vector);
2108 if(FLAG_M && CPU_TYPE_IS_EC020_PLUS(CPU_TYPE))
2110 /* Create throwaway frame */
2111 m68ki_set_sm_flag(FLAG_S); /* clear M */
2112 sr |= 0x2000; /* Same as SR in master stack frame except S is forced high */
2113 m68ki_stack_frame_0001(REG_PC, sr, vector);
2118 /* Defer cycle counting until later */
2119 USE_CYCLES(CYC_EXCEPTION[vector]);
2121 #if !M68K_EMULATE_INT_ACK
2122 /* Automatically clear IRQ if we are not using an acknowledge scheme */
2124 #endif /* M68K_EMULATE_INT_ACK */
2128 /* ASG: Check for interrupts */
2129 static inline void m68ki_check_interrupts(void)
2131 if(m68ki_cpu.nmi_pending)
2133 m68ki_cpu.nmi_pending = FALSE;
2134 m68ki_exception_interrupt(7);
2136 else if(CPU_INT_LEVEL > FLAG_INT_MASK)
2137 m68ki_exception_interrupt(CPU_INT_LEVEL>>8);
2142 /* ======================================================================== */
2143 /* ============================== END OF FILE ============================= */
2144 /* ======================================================================== */
2150 #endif /* M68KCPU__HEADER */