/* ======================================================================== */ /* ========================= LICENSING & COPYRIGHT ======================== */ /* ======================================================================== */ /* * MUSASHI * Version 3.32 * * A portable Motorola M680x0 processor emulation engine. * Copyright Karl Stenerud. All rights reserved. * * This code may be freely used for non-commercial purposes as long as this * copyright notice remains unaltered in the source code and any binary files * containing this code in compiled form. * * All other licensing terms must be negotiated with the author * (Karl Stenerud). * * The latest version of this code can be obtained at: * http://kstenerud.cjb.net */ /* Modified by Eke-Eke for Genesis Plus GX: - removed unused stuff to reduce memory usage / optimize execution (multiple CPU types support, NMI support, ...) - moved stuff to compile statically in a single object file - implemented support for global cycle count (shared by 68k & Z80 CPU) - added support for interrupt latency (Sesame's Street Counting Cafe, Fatal Rewind) - added proper cycle use on reset - added cycle accurate timings for MUL/DIV instructions (thanks to Jorge Cwik !) - fixed undocumented flags for DIV instructions (Blood Shot) */ #ifndef M68KCPU__HEADER #define M68KCPU__HEADER #include #include #include #include "m68k.h" #if M68K_EMULATE_ADDRESS_ERROR #include #endif /* M68K_EMULATE_ADDRESS_ERROR */ /* ======================================================================== */ /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */ /* ======================================================================== */ /* Check for > 32bit sizes */ #if UINT_MAX > 0xffffffff #define M68K_INT_GT_32_BIT 1 #else #define M68K_INT_GT_32_BIT 0 #endif /* Data types used in this emulation core */ #undef sint8 #undef sint16 #undef sint32 #undef sint64 #undef uint8 #undef uint16 #undef uint32 #undef uint64 #undef sint #undef uint #define sint8 signed char /* ASG: changed from char to signed char */ #define sint16 signed short #define sint32 signed int /* AWJ: changed from long to int */ #define uint8 unsigned char #define uint16 unsigned short #define uint32 unsigned int /* AWJ: changed from long to int */ /* signed and unsigned int must be at least 32 bits wide */ #define sint signed int #define uint unsigned int #if M68K_USE_64_BIT #define sint64 signed long long #define uint64 unsigned long long #else #define sint64 sint32 #define uint64 uint32 #endif /* M68K_USE_64_BIT */ /* Allow for architectures that don't have 8-bit sizes */ #if UCHAR_MAX == 0xff #define MAKE_INT_8(A) (sint8)(A) #else #undef sint8 #define sint8 signed int #undef uint8 #define uint8 unsigned int INLINE sint MAKE_INT_8(uint value) { return (value & 0x80) ? value | ~0xff : value & 0xff; } #endif /* UCHAR_MAX == 0xff */ /* Allow for architectures that don't have 16-bit sizes */ #if USHRT_MAX == 0xffff #define MAKE_INT_16(A) (sint16)(A) #else #undef sint16 #define sint16 signed int #undef uint16 #define uint16 unsigned int INLINE sint MAKE_INT_16(uint value) { return (value & 0x8000) ? value | ~0xffff : value & 0xffff; } #endif /* USHRT_MAX == 0xffff */ /* Allow for architectures that don't have 32-bit sizes */ #if UINT_MAX == 0xffffffff #define MAKE_INT_32(A) (sint32)(A) #else #undef sint32 #define sint32 signed int #undef uint32 #define uint32 unsigned int INLINE sint MAKE_INT_32(uint value) { return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff; } #endif /* UINT_MAX == 0xffffffff */ /* ======================================================================== */ /* ============================ GENERAL DEFINES =========================== */ /* ======================================================================== */ /* Exception Vectors handled by emulation */ #define EXCEPTION_RESET 0 #define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */ #define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */ #define EXCEPTION_ILLEGAL_INSTRUCTION 4 #define EXCEPTION_ZERO_DIVIDE 5 #define EXCEPTION_CHK 6 #define EXCEPTION_TRAPV 7 #define EXCEPTION_PRIVILEGE_VIOLATION 8 #define EXCEPTION_TRACE 9 #define EXCEPTION_1010 10 #define EXCEPTION_1111 11 #define EXCEPTION_FORMAT_ERROR 14 #define EXCEPTION_UNINITIALIZED_INTERRUPT 15 #define EXCEPTION_SPURIOUS_INTERRUPT 24 #define EXCEPTION_INTERRUPT_AUTOVECTOR 24 #define EXCEPTION_TRAP_BASE 32 /* Function codes set by CPU during data/address bus activity */ #define FUNCTION_CODE_USER_DATA 1 #define FUNCTION_CODE_USER_PROGRAM 2 #define FUNCTION_CODE_SUPERVISOR_DATA 5 #define FUNCTION_CODE_SUPERVISOR_PROGRAM 6 #define FUNCTION_CODE_CPU_SPACE 7 /* Different ways to stop the CPU */ #define STOP_LEVEL_STOP 1 #define STOP_LEVEL_HALT 2 /* Used for 68000 address error processing */ #if M68K_EMULATE_ADDRESS_ERROR #define INSTRUCTION_YES 0 #define INSTRUCTION_NO 0x08 #define MODE_READ 0x10 #define MODE_WRITE 0 #define RUN_MODE_NORMAL 0 #define RUN_MODE_BERR_AERR_RESET 1 #endif #ifndef NULL #define NULL ((void*)0) #endif /* ======================================================================== */ /* ================================ MACROS ================================ */ /* ======================================================================== */ /* ---------------------------- General Macros ---------------------------- */ /* Bit Isolation Macros */ #define BIT_0(A) ((A) & 0x00000001) #define BIT_1(A) ((A) & 0x00000002) #define BIT_2(A) ((A) & 0x00000004) #define BIT_3(A) ((A) & 0x00000008) #define BIT_4(A) ((A) & 0x00000010) #define BIT_5(A) ((A) & 0x00000020) #define BIT_6(A) ((A) & 0x00000040) #define BIT_7(A) ((A) & 0x00000080) #define BIT_8(A) ((A) & 0x00000100) #define BIT_9(A) ((A) & 0x00000200) #define BIT_A(A) ((A) & 0x00000400) #define BIT_B(A) ((A) & 0x00000800) #define BIT_C(A) ((A) & 0x00001000) #define BIT_D(A) ((A) & 0x00002000) #define BIT_E(A) ((A) & 0x00004000) #define BIT_F(A) ((A) & 0x00008000) #define BIT_10(A) ((A) & 0x00010000) #define BIT_11(A) ((A) & 0x00020000) #define BIT_12(A) ((A) & 0x00040000) #define BIT_13(A) ((A) & 0x00080000) #define BIT_14(A) ((A) & 0x00100000) #define BIT_15(A) ((A) & 0x00200000) #define BIT_16(A) ((A) & 0x00400000) #define BIT_17(A) ((A) & 0x00800000) #define BIT_18(A) ((A) & 0x01000000) #define BIT_19(A) ((A) & 0x02000000) #define BIT_1A(A) ((A) & 0x04000000) #define BIT_1B(A) ((A) & 0x08000000) #define BIT_1C(A) ((A) & 0x10000000) #define BIT_1D(A) ((A) & 0x20000000) #define BIT_1E(A) ((A) & 0x40000000) #define BIT_1F(A) ((A) & 0x80000000) /* Get the most significant bit for specific sizes */ #define GET_MSB_8(A) ((A) & 0x80) #define GET_MSB_9(A) ((A) & 0x100) #define GET_MSB_16(A) ((A) & 0x8000) #define GET_MSB_17(A) ((A) & 0x10000) #define GET_MSB_32(A) ((A) & 0x80000000) #if M68K_USE_64_BIT #define GET_MSB_33(A) ((A) & 0x100000000) #endif /* M68K_USE_64_BIT */ /* Isolate nibbles */ #define LOW_NIBBLE(A) ((A) & 0x0f) #define HIGH_NIBBLE(A) ((A) & 0xf0) /* These are used to isolate 8, 16, and 32 bit sizes */ #define MASK_OUT_ABOVE_2(A) ((A) & 3) #define MASK_OUT_ABOVE_8(A) ((A) & 0xff) #define MASK_OUT_ABOVE_16(A) ((A) & 0xffff) #define MASK_OUT_BELOW_2(A) ((A) & ~3) #define MASK_OUT_BELOW_8(A) ((A) & ~0xff) #define MASK_OUT_BELOW_16(A) ((A) & ~0xffff) /* No need to mask if we are 32 bit */ #if M68K_INT_GT_32_BIT || M68K_USE_64_BIT #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff) #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff) #else #define MASK_OUT_ABOVE_32(A) (A) #define MASK_OUT_BELOW_32(A) 0 #endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */ /* Simulate address lines of 68k family */ #define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK) /* Shift & Rotate Macros. */ #define LSL(A, C) ((A) << (C)) #define LSR(A, C) ((A) >> (C)) /* Some > 32-bit optimizations */ #if M68K_INT_GT_32_BIT /* Shift left and right */ #define LSR_32(A, C) ((A) >> (C)) #define LSL_32(A, C) ((A) << (C)) #else /* We have to do this because the morons at ANSI decided that shifts * by >= data size are undefined. */ #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0) #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0) #endif /* M68K_INT_GT_32_BIT */ #if M68K_USE_64_BIT #define LSL_32_64(A, C) ((A) << (C)) #define LSR_32_64(A, C) ((A) >> (C)) #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C))) #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C))) #endif /* M68K_USE_64_BIT */ #define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C))) #define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C))) #define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C))) #define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C))) #define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C))) #define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C))) #define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C))) #define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C))) #define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C))) #define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C))) #define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C))) #define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C))) /* ------------------------------ CPU Access ------------------------------ */ /* Access the CPU registers */ #define REG_DA m68ki_cpu.dar /* easy access to data and address regs */ #define REG_D m68ki_cpu.dar #define REG_A (m68ki_cpu.dar+8) #define REG_PC m68ki_cpu.pc #define REG_SP_BASE m68ki_cpu.sp #define REG_USP m68ki_cpu.sp[0] #define REG_ISP m68ki_cpu.sp[4] #define REG_SP m68ki_cpu.dar[15] #define REG_IR m68ki_cpu.ir #define FLAG_T1 m68ki_cpu.t1_flag #define FLAG_S m68ki_cpu.s_flag #define FLAG_X m68ki_cpu.x_flag #define FLAG_N m68ki_cpu.n_flag #define FLAG_Z m68ki_cpu.not_z_flag #define FLAG_V m68ki_cpu.v_flag #define FLAG_C m68ki_cpu.c_flag #define FLAG_INT_MASK m68ki_cpu.int_mask #define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */ #define CPU_STOPPED m68ki_cpu.stopped #if M68K_EMULATE_PREFETCH #define CPU_PREF_ADDR m68ki_cpu.pref_addr #define CPU_PREF_DATA m68ki_cpu.pref_data #endif #define CPU_ADDRESS_MASK 0x00ffffff #if M68K_EMULATE_ADDRESS_ERROR #define CPU_INSTR_MODE m68ki_cpu.instr_mode #define CPU_RUN_MODE m68ki_cpu.run_mode #endif #define CYC_INSTRUCTION m68ki_cycles #define CYC_EXCEPTION m68ki_exception_cycle_table #define CYC_BCC_NOTAKE_B ( -2 * 7) #define CYC_BCC_NOTAKE_W ( 2 * 7) #define CYC_DBCC_F_NOEXP ( -2 * 7) #define CYC_DBCC_F_EXP ( 2 * 7) #define CYC_SCC_R_TRUE ( 2 * 7) #define CYC_MOVEM_W ( 4 * 7) #define CYC_MOVEM_L ( 8 * 7) #define CYC_SHIFT ( 2 * 7) #define CYC_RESET (132 * 7) #if M68K_EMULATE_INT_ACK == OPT_ON #define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback #endif #if M68K_EMULATE_RESET == OPT_ON #define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback #endif #if M68K_TAS_HAS_CALLBACK == OPT_ON #define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback #endif #if M68K_EMULATE_FC == OPT_ON #define CALLBACK_SET_FC m68ki_cpu.set_fc_callback #endif /* ----------------------------- Configuration ---------------------------- */ /* These defines are dependant on the configuration defines in m68kconf.h */ /* Enable or disable callback functions */ #if M68K_EMULATE_INT_ACK #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A); #else #define m68ki_int_ack(A) CALLBACK_INT_ACK(A); #endif #else /* Default action is to used autovector mode, which is most common */ #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR #endif /* M68K_EMULATE_INT_ACK */ #if M68K_EMULATE_RESET #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER #define m68ki_output_reset() M68K_RESET_CALLBACK(); #else #define m68ki_output_reset() CALLBACK_RESET_INSTR(); #endif #else #define m68ki_output_reset() #endif /* M68K_EMULATE_RESET */ #if M68K_TAS_HAS_CALLBACK #if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER #define m68ki_tas_callback() M68K_TAS_CALLBACK() #else #define m68ki_tas_callback() CALLBACK_TAS_INSTR() #endif #else #define m68ki_tas_callback() 0 #endif /* M68K_TAS_HAS_CALLBACK */ /* Enable or disable function code emulation */ #if M68K_EMULATE_FC #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A); #else #define m68ki_set_fc(A) CALLBACK_SET_FC(A); #endif #define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA; #define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM; #define m68ki_get_address_space() m68ki_address_space #else #define m68ki_set_fc(A) #define m68ki_use_data_space() #define m68ki_use_program_space() #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA #endif /* M68K_EMULATE_FC */ /* Enable or disable trace emulation */ #if M68K_EMULATE_TRACE /* Initiates trace checking before each instruction (t1) */ #define m68ki_trace_t1() m68ki_tracing = FLAG_T1; /* Clear all tracing */ #define m68ki_clear_trace() m68ki_tracing = 0; /* Cause a trace exception if we are tracing */ #define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace(); #else #define m68ki_trace_t1() #define m68ki_clear_trace() #define m68ki_exception_if_trace() #endif /* M68K_EMULATE_TRACE */ /* Enable or disable Address error emulation */ #if M68K_EMULATE_ADDRESS_ERROR #define m68ki_set_address_error_trap() \ if(setjmp(m68ki_aerr_trap) != 0) \ { \ m68ki_exception_address_error(); \ } #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \ if((ADDR)&1) \ { \ if (emulate_address_error) \ { \ m68ki_aerr_address = ADDR; \ m68ki_aerr_write_mode = WRITE_MODE; \ m68ki_aerr_fc = FC; \ longjmp(m68ki_aerr_trap, 1); \ } \ } #else #define m68ki_set_address_error_trap() #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) #endif /* M68K_ADDRESS_ERROR */ /* -------------------------- EA / Operand Access ------------------------- */ /* * The general instruction format follows this pattern: * .... XXX. .... .YYY * where XXX is register X and YYY is register Y */ /* Data Register Isolation */ #define DX (REG_D[(REG_IR >> 9) & 7]) #define DY (REG_D[REG_IR & 7]) /* Address Register Isolation */ #define AX (REG_A[(REG_IR >> 9) & 7]) #define AY (REG_A[REG_IR & 7]) /* Effective Address Calculations */ #define EA_AY_AI_8() AY /* address register indirect */ #define EA_AY_AI_16() EA_AY_AI_8() #define EA_AY_AI_32() EA_AY_AI_8() #define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */ #define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */ #define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */ #define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */ #define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */ #define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */ #define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */ #define EA_AY_DI_16() EA_AY_DI_8() #define EA_AY_DI_32() EA_AY_DI_8() #define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */ #define EA_AY_IX_16() EA_AY_IX_8() #define EA_AY_IX_32() EA_AY_IX_8() #define EA_AX_AI_8() AX #define EA_AX_AI_16() EA_AX_AI_8() #define EA_AX_AI_32() EA_AX_AI_8() #define EA_AX_PI_8() (AX++) #define EA_AX_PI_16() ((AX+=2)-2) #define EA_AX_PI_32() ((AX+=4)-4) #define EA_AX_PD_8() (--AX) #define EA_AX_PD_16() (AX-=2) #define EA_AX_PD_32() (AX-=4) #define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16())) #define EA_AX_DI_16() EA_AX_DI_8() #define EA_AX_DI_32() EA_AX_DI_8() #define EA_AX_IX_8() m68ki_get_ea_ix(AX) #define EA_AX_IX_16() EA_AX_IX_8() #define EA_AX_IX_32() EA_AX_IX_8() #define EA_A7_PI_8() ((REG_A[7]+=2)-2) #define EA_A7_PD_8() (REG_A[7]-=2) #define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */ #define EA_AW_16() EA_AW_8() #define EA_AW_32() EA_AW_8() #define EA_AL_8() m68ki_read_imm_32() /* absolute long */ #define EA_AL_16() EA_AL_8() #define EA_AL_32() EA_AL_8() #define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */ #define EA_PCDI_16() EA_PCDI_8() #define EA_PCDI_32() EA_PCDI_8() #define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */ #define EA_PCIX_16() EA_PCIX_8() #define EA_PCIX_32() EA_PCIX_8() #define OPER_I_8() m68ki_read_imm_8() #define OPER_I_16() m68ki_read_imm_16() #define OPER_I_32() m68ki_read_imm_32() /* --------------------------- Status Register ---------------------------- */ /* Flag Calculation Macros */ #define CFLAG_8(A) (A) #define CFLAG_16(A) ((A)>>8) #if M68K_INT_GT_32_BIT #define CFLAG_ADD_32(S, D, R) ((R)>>24) #define CFLAG_SUB_32(S, D, R) ((R)>>24) #else #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23) #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23) #endif /* M68K_INT_GT_32_BIT */ #define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R)) #define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8) #define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24) #define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D)) #define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8) #define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24) #define NFLAG_8(A) (A) #define NFLAG_16(A) ((A)>>8) #define NFLAG_32(A) ((A)>>24) #define NFLAG_64(A) ((A)>>56) #define ZFLAG_8(A) MASK_OUT_ABOVE_8(A) #define ZFLAG_16(A) MASK_OUT_ABOVE_16(A) #define ZFLAG_32(A) MASK_OUT_ABOVE_32(A) /* Flag values */ #define NFLAG_SET 0x80 #define NFLAG_CLEAR 0 #define CFLAG_SET 0x100 #define CFLAG_CLEAR 0 #define XFLAG_SET 0x100 #define XFLAG_CLEAR 0 #define VFLAG_SET 0x80 #define VFLAG_CLEAR 0 #define ZFLAG_SET 0 #define ZFLAG_CLEAR 0xffffffff #define SFLAG_SET 4 #define SFLAG_CLEAR 0 /* Turn flag values into 1 or 0 */ #define XFLAG_AS_1() ((FLAG_X>>8)&1) #define NFLAG_AS_1() ((FLAG_N>>7)&1) #define VFLAG_AS_1() ((FLAG_V>>7)&1) #define ZFLAG_AS_1() (!FLAG_Z) #define CFLAG_AS_1() ((FLAG_C>>8)&1) /* Conditions */ #define COND_CS() (FLAG_C&0x100) #define COND_CC() (!COND_CS()) #define COND_VS() (FLAG_V&0x80) #define COND_VC() (!COND_VS()) #define COND_NE() FLAG_Z #define COND_EQ() (!COND_NE()) #define COND_MI() (FLAG_N&0x80) #define COND_PL() (!COND_MI()) #define COND_LT() ((FLAG_N^FLAG_V)&0x80) #define COND_GE() (!COND_LT()) #define COND_HI() (COND_CC() && COND_NE()) #define COND_LS() (COND_CS() || COND_EQ()) #define COND_GT() (COND_GE() && COND_NE()) #define COND_LE() (COND_LT() || COND_EQ()) /* Reversed conditions */ #define COND_NOT_CS() COND_CC() #define COND_NOT_CC() COND_CS() #define COND_NOT_VS() COND_VC() #define COND_NOT_VC() COND_VS() #define COND_NOT_NE() COND_EQ() #define COND_NOT_EQ() COND_NE() #define COND_NOT_MI() COND_PL() #define COND_NOT_PL() COND_MI() #define COND_NOT_LT() COND_GE() #define COND_NOT_GE() COND_LT() #define COND_NOT_HI() COND_LS() #define COND_NOT_LS() COND_HI() #define COND_NOT_GT() COND_LE() #define COND_NOT_LE() COND_GT() /* Not real conditions, but here for convenience */ #define COND_XS() (FLAG_X&0x100) #define COND_XC() (!COND_XS) /* Get the condition code register */ #define m68ki_get_ccr() ((COND_XS() >> 4) | \ (COND_MI() >> 4) | \ (COND_EQ() << 2) | \ (COND_VS() >> 6) | \ (COND_CS() >> 8)) /* Get the status register */ #define m68ki_get_sr() ( FLAG_T1 | \ (FLAG_S << 11) | \ FLAG_INT_MASK | \ m68ki_get_ccr()) /* ---------------------------- Cycle Counting ---------------------------- */ #define USE_CYCLES(A) mcycles_68k += (A) #define END_CYCLES(A) mcycles_68k = (A) /* ----------------------------- Read / Write ----------------------------- */ /* Read from the current address space */ #define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space()) #define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space()) #define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space()) /* Write to the current data space */ #define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V) /* map read immediate 8 to read immediate 16 */ #define m68ki_read_imm_8() MASK_OUT_ABOVE_8(m68ki_read_imm_16()) /* Map PC-relative reads */ #define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A) #define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A) #define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A) /* Read from the program space */ #define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM) #define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM) #define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* Read from the data space */ #define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA) #define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA) #define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA) /* ======================================================================== */ /* =============================== PROTOTYPES ============================= */ /* ======================================================================== */ typedef struct { uint dar[16]; /* Data and Address Registers */ uint pc; /* Program Counter */ uint sp[5]; /* User and Interrupt Stack Pointers */ uint ir; /* Instruction Register */ uint t1_flag; /* Trace 1 */ uint s_flag; /* Supervisor */ uint x_flag; /* Extend */ uint n_flag; /* Negative */ uint not_z_flag; /* Zero, inverted for speedups */ uint v_flag; /* Overflow */ uint c_flag; /* Carry */ uint int_mask; /* I0-I2 */ uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */ uint stopped; /* Stopped state */ #if M68K_EMULATE_PREFETCH uint pref_addr; /* Last prefetch address */ uint pref_data; /* Data in the prefetch queue */ #endif #if M68K_EMULATE_ADDRESS_ERROR uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */ uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */ #endif /* Callbacks to host */ #if M68K_EMULATE_INT_ACK == OPT_ON int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */ #endif #if M68K_EMULATE_RESET == OPT_ON void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */ #endif #if M68K_TAS_HAS_CALLBACK == OPT_ON int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */ #endif #if M68K_EMULATE_FC == OPT_ON void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */ #endif } m68ki_cpu_core; /* The CPU core */ m68ki_cpu_core m68ki_cpu; /* Prevent static data from being redefined when this file is included */ #ifndef _MEM68K_H_ #if M68K_EMULATE_TRACE static uint m68ki_tracing; #endif /* M68K_EMULATE_TRACE */ #if M68K_EMULATE_FC static uint m68ki_address_space; #endif /* M68K_EMULATE_FC */ #if M68K_EMULATE_ADDRESS_ERROR static jmp_buf m68ki_aerr_trap; static uint m68ki_aerr_address; static uint m68ki_aerr_write_mode; static uint m68ki_aerr_fc; int emulate_address_error; #endif /* M68K_EMULATE_ADDRESS_ERROR */ /* Current end cycle */ static unsigned int end_cycles; /* Cycles used by CPU instructions */ #ifdef BUILD_TABLES static unsigned char m68ki_cycles[0x10000]; #else #include "m68ki_cycles.h" #endif /* Used by shift & rotate instructions */ static const uint8 m68ki_shift_8_table[65] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; static const uint16 m68ki_shift_16_table[65] = { 0x0000, 0x8000, 0xc000, 0xe000, 0xf000, 0xf800, 0xfc00, 0xfe00, 0xff00, 0xff80, 0xffc0, 0xffe0, 0xfff0, 0xfff8, 0xfffc, 0xfffe, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff }; static const uint m68ki_shift_32_table[65] = { 0x00000000, 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, 0xf8000000, 0xfc000000, 0xfe000000, 0xff000000, 0xff800000, 0xffc00000, 0xffe00000, 0xfff00000, 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, 0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000, 0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00, 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, 0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }; /* Number of clock cycles to use for exception processing. * I used 4 for any vectors that are undocumented for processing times. */ static const uint16 m68ki_exception_cycle_table[256] = { 40*7, /* 0: Reset - Initial Stack Pointer */ 4*7, /* 1: Reset - Initial Program Counter */ 50*7, /* 2: Bus Error (unemulated) */ 50*7, /* 3: Address Error (unemulated) */ 34*7, /* 4: Illegal Instruction */ 38*7, /* 5: Divide by Zero -- ASG: changed from 42 */ 40*7, /* 6: CHK -- ASG: chanaged from 44 */ 34*7, /* 7: TRAPV */ 34*7, /* 8: Privilege Violation */ 34*7, /* 9: Trace */ 4*7, /* 10: 1010 */ 4*7, /* 11: 1111 */ 4*7, /* 12: RESERVED */ 4*7, /* 13: Coprocessor Protocol Violation (unemulated) */ 4*7, /* 14: Format Error */ 44*7, /* 15: Uninitialized Interrupt */ 4*7, /* 16: RESERVED */ 4*7, /* 17: RESERVED */ 4*7, /* 18: RESERVED */ 4*7, /* 19: RESERVED */ 4*7, /* 20: RESERVED */ 4*7, /* 21: RESERVED */ 4*7, /* 22: RESERVED */ 4*7, /* 23: RESERVED */ 44*7, /* 24: Spurious Interrupt */ 44*7, /* 25: Level 1 Interrupt Autovector */ 44*7, /* 26: Level 2 Interrupt Autovector */ 44*7, /* 27: Level 3 Interrupt Autovector */ 44*7, /* 28: Level 4 Interrupt Autovector */ 44*7, /* 29: Level 5 Interrupt Autovector */ 44*7, /* 30: Level 6 Interrupt Autovector */ 44*7, /* 31: Level 7 Interrupt Autovector */ 34*7, /* 32: TRAP #0 -- ASG: chanaged from 38 */ 34*7, /* 33: TRAP #1 */ 34*7, /* 34: TRAP #2 */ 34*7, /* 35: TRAP #3 */ 34*7, /* 36: TRAP #4 */ 34*7, /* 37: TRAP #5 */ 34*7, /* 38: TRAP #6 */ 34*7, /* 39: TRAP #7 */ 34*7, /* 40: TRAP #8 */ 34*7, /* 41: TRAP #9 */ 34*7, /* 42: TRAP #10 */ 34*7, /* 43: TRAP #11 */ 34*7, /* 44: TRAP #12 */ 34*7, /* 45: TRAP #13 */ 34*7, /* 46: TRAP #14 */ 34*7, /* 47: TRAP #15 */ 4*7, /* 48: FP Branch or Set on Unknown Condition (unemulated) */ 4*7, /* 49: FP Inexact Result (unemulated) */ 4*7, /* 50: FP Divide by Zero (unemulated) */ 4*7, /* 51: FP Underflow (unemulated) */ 4*7, /* 52: FP Operand Error (unemulated) */ 4*7, /* 53: FP Overflow (unemulated) */ 4*7, /* 54: FP Signaling NAN (unemulated) */ 4*7, /* 55: FP Unimplemented Data Type (unemulated) */ 4*7, /* 56: MMU Configuration Error (unemulated) */ 4*7, /* 57: MMU Illegal Operation Error (unemulated) */ 4*7, /* 58: MMU Access Level Violation Error (unemulated) */ 4*7, /* 59: RESERVED */ 4*7, /* 60: RESERVED */ 4*7, /* 61: RESERVED */ 4*7, /* 62: RESERVED */ 4*7, /* 63: RESERVED */ /* 64-255: User Defined */ 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7, 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7, 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7, 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7, 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7, 4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7,4*7 }; /* Read data immediately after the program counter */ INLINE uint m68ki_read_imm_16(void); INLINE uint m68ki_read_imm_32(void); /* Read data with specific function code */ INLINE uint m68ki_read_8_fc (uint address, uint fc); INLINE uint m68ki_read_16_fc (uint address, uint fc); INLINE uint m68ki_read_32_fc (uint address, uint fc); /* Write data with specific function code */ INLINE void m68ki_write_8_fc (uint address, uint fc, uint value); INLINE void m68ki_write_16_fc(uint address, uint fc, uint value); INLINE void m68ki_write_32_fc(uint address, uint fc, uint value); /* Indexed and PC-relative ea fetching */ INLINE uint m68ki_get_ea_pcdi(void); INLINE uint m68ki_get_ea_pcix(void); INLINE uint m68ki_get_ea_ix(uint An); /* Operand fetching */ INLINE uint OPER_AY_AI_8(void); INLINE uint OPER_AY_AI_16(void); INLINE uint OPER_AY_AI_32(void); INLINE uint OPER_AY_PI_8(void); INLINE uint OPER_AY_PI_16(void); INLINE uint OPER_AY_PI_32(void); INLINE uint OPER_AY_PD_8(void); INLINE uint OPER_AY_PD_16(void); INLINE uint OPER_AY_PD_32(void); INLINE uint OPER_AY_DI_8(void); INLINE uint OPER_AY_DI_16(void); INLINE uint OPER_AY_DI_32(void); INLINE uint OPER_AY_IX_8(void); INLINE uint OPER_AY_IX_16(void); INLINE uint OPER_AY_IX_32(void); INLINE uint OPER_AX_AI_8(void); INLINE uint OPER_AX_AI_16(void); INLINE uint OPER_AX_AI_32(void); INLINE uint OPER_AX_PI_8(void); INLINE uint OPER_AX_PI_16(void); INLINE uint OPER_AX_PI_32(void); INLINE uint OPER_AX_PD_8(void); INLINE uint OPER_AX_PD_16(void); INLINE uint OPER_AX_PD_32(void); INLINE uint OPER_AX_DI_8(void); INLINE uint OPER_AX_DI_16(void); INLINE uint OPER_AX_DI_32(void); INLINE uint OPER_AX_IX_8(void); INLINE uint OPER_AX_IX_16(void); INLINE uint OPER_AX_IX_32(void); INLINE uint OPER_A7_PI_8(void); INLINE uint OPER_A7_PD_8(void); INLINE uint OPER_AW_8(void); INLINE uint OPER_AW_16(void); INLINE uint OPER_AW_32(void); INLINE uint OPER_AL_8(void); INLINE uint OPER_AL_16(void); INLINE uint OPER_AL_32(void); INLINE uint OPER_PCDI_8(void); INLINE uint OPER_PCDI_16(void); INLINE uint OPER_PCDI_32(void); INLINE uint OPER_PCIX_8(void); INLINE uint OPER_PCIX_16(void); INLINE uint OPER_PCIX_32(void); /* Stack operations */ INLINE void m68ki_push_16(uint value); INLINE void m68ki_push_32(uint value); INLINE uint m68ki_pull_16(void); INLINE uint m68ki_pull_32(void); /* Program flow operations */ INLINE void m68ki_jump(uint new_pc); INLINE void m68ki_jump_vector(uint vector); INLINE void m68ki_branch_8(uint offset); INLINE void m68ki_branch_16(uint offset); INLINE void m68ki_branch_32(uint offset); /* Status register operations. */ INLINE void m68ki_set_s_flag(uint value); /* Only bit 2 of value should be set (i.e. 4 or 0) */ INLINE void m68ki_set_ccr(uint value); /* set the condition code register */ INLINE void m68ki_set_sr(uint value); /* set the status register */ /* Exception processing */ INLINE uint m68ki_init_exception(void); /* Initial exception processing */ INLINE void m68ki_stack_frame_3word(uint pc, uint sr); /* Stack various frame types */ #if M68K_EMULATE_ADDRESS_ERROR INLINE void m68ki_stack_frame_buserr(uint sr); #endif INLINE void m68ki_exception_trap(uint vector); INLINE void m68ki_exception_trapN(uint vector); #if M68K_EMULATE_TRACE INLINE void m68ki_exception_trace(void); #endif static void m68ki_exception_privilege_violation(void); /* do not inline in order to reduce function size and allow inlining of read/write functions by the compile */ INLINE void m68ki_exception_1010(void); INLINE void m68ki_exception_1111(void); INLINE void m68ki_exception_illegal(void); #if M68K_EMULATE_ADDRESS_ERROR INLINE void m68ki_exception_address_error(void); #endif INLINE void m68ki_exception_interrupt(uint int_level); INLINE void m68ki_check_interrupts(void); /* ASG: check for interrupts */ /* External ressources (specific to Genesis Plus GX core) */ extern int vdp_68k_irq_ack(int int_level); extern uint32 mcycles_68k; /* ======================================================================== */ /* =========================== UTILITY FUNCTIONS ========================== */ /* ======================================================================== */ /* ---------------------------- Read Immediate ---------------------------- */ /* Handles all immediate reads, does address error check, function code setting, * and prefetching if they are enabled in m68kconf.h */ INLINE uint m68ki_read_imm_16(void) { m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #if M68K_CHECK_PC_ADDRESS_ERROR m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #endif #if M68K_EMULATE_PREFETCH if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) { CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); } REG_PC += 2; return MASK_OUT_ABOVE_16(CPU_PREF_DATA >> ((2-((REG_PC-2)&2))<<3)); #else uint pc = REG_PC; REG_PC += 2; return m68k_read_immediate_16(pc); #endif /* M68K_EMULATE_PREFETCH */ } INLINE uint m68ki_read_imm_32(void) { #if M68K_EMULATE_PREFETCH uint temp_val; m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #if M68K_CHECK_PC_ADDRESS_ERROR m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #endif if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) { CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); } temp_val = CPU_PREF_DATA; REG_PC += 2; if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) { CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | (CPU_PREF_DATA >> 16)); } REG_PC += 2; return temp_val; #else m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #if M68K_CHECK_PC_ADDRESS_ERROR m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ #endif uint pc = REG_PC; REG_PC += 4; return m68k_read_immediate_32(pc); #endif /* M68K_EMULATE_PREFETCH */ } /* ------------------------- Top level read/write ------------------------- */ /* Handles all memory accesses (except for immediate reads if they are * configured to use separate functions in m68kconf.h). * All memory accesses must go through these top level functions. * These functions will also check for address error and set the function * code if they are enabled in m68kconf.h. */ INLINE uint m68ki_read_8_fc(uint address, uint fc) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->read8) return (*temp->read8)(ADDRESS_68K(address)); else return READ_BYTE(temp->base, (address) & 0xffff); } INLINE uint m68ki_read_16_fc(uint address, uint fc) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ m68ki_check_address_error(address, MODE_READ, fc) /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->read16) return (*temp->read16)(ADDRESS_68K(address)); else return *(uint16 *)(temp->base + ((address) & 0xffff)); } INLINE uint m68ki_read_32_fc(uint address, uint fc) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ m68ki_check_address_error(address, MODE_READ, fc) /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->read16) return ((*temp->read16)(ADDRESS_68K(address)) << 16) | ((*temp->read16)(ADDRESS_68K(address + 2))); else return m68k_read_immediate_32(address); } INLINE void m68ki_write_8_fc(uint address, uint fc, uint value) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->write8) (*temp->write8)(ADDRESS_68K(address),value); else WRITE_BYTE(temp->base, (address) & 0xffff, value); } INLINE void m68ki_write_16_fc(uint address, uint fc, uint value) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ m68ki_check_address_error(address, MODE_WRITE, fc); /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->write16) (*temp->write16)(ADDRESS_68K(address),value); else *(uint16 *)(temp->base + ((address) & 0xffff)) = value; } INLINE void m68ki_write_32_fc(uint address, uint fc, uint value) { _m68k_memory_map *temp; m68ki_set_fc(fc) /* auto-disable (see m68kcpu.h) */ m68ki_check_address_error(address, MODE_WRITE, fc) /* auto-disable (see m68kcpu.h) */ temp = &m68k_memory_map[((address)>>16)&0xff]; if (temp->write16) (*temp->write16)(ADDRESS_68K(address),value>>16); else *(uint16 *)(temp->base + ((address) & 0xffff)) = value >> 16; temp = &m68k_memory_map[((address + 2)>>16)&0xff]; if (temp->write16) (*temp->write16)(ADDRESS_68K(address+2),value&0xffff); else *(uint16 *)(temp->base + ((address + 2) & 0xffff)) = value; } /* --------------------- Effective Address Calculation -------------------- */ /* The program counter relative addressing modes cause operands to be * retrieved from program space, not data space. */ INLINE uint m68ki_get_ea_pcdi(void) { uint old_pc = REG_PC; m68ki_use_program_space() /* auto-disable */ return old_pc + MAKE_INT_16(m68ki_read_imm_16()); } INLINE uint m68ki_get_ea_pcix(void) { m68ki_use_program_space() /* auto-disable */ return m68ki_get_ea_ix(REG_PC); } /* Indexed addressing modes are encoded as follows: * * Base instruction format: * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0 * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An) * * Base instruction format for destination EA in move instructions: * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0 * x x x x | BASE REG | 1 1 0 | X X X X X X (An) * * Brief extension format: * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0 * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT * * Full extension format: * F E D C B A 9 8 7 6 5 4 3 2 1 0 * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS * BASE DISPLACEMENT (0, 16, 32 bit) (bd) * OUTER DISPLACEMENT (0, 16, 32 bit) (od) * * D/A: 0 = Dn, 1 = An (Xn) * W/L: 0 = W (sign extend), 1 = L (.SIZE) * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE) * BS: 0=add base reg, 1=suppress base reg (An suppressed) * IS: 0=add index, 1=suppress index (Xn suppressed) * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd) * * IS I/IS Operation * 0 000 No Memory Indirect * 0 001 indir prex with null outer * 0 010 indir prex with word outer * 0 011 indir prex with long outer * 0 100 reserved * 0 101 indir postx with null outer * 0 110 indir postx with word outer * 0 111 indir postx with long outer * 1 000 no memory indirect * 1 001 mem indir with null outer * 1 010 mem indir with word outer * 1 011 mem indir with long outer * 1 100-111 reserved */ INLINE uint m68ki_get_ea_ix(uint An) { /* An = base register */ uint extension = m68ki_read_imm_16(); uint Xn = 0; /* Index register */ /* Calculate index */ Xn = REG_DA[extension>>12]; /* Xn */ if(!BIT_B(extension)) /* W/L */ Xn = MAKE_INT_16(Xn); /* Add base register and displacement and return */ return An + Xn + MAKE_INT_8(extension); } /* Fetch operands */ INLINE uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); } INLINE uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);} INLINE uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);} INLINE uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); } INLINE uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);} INLINE uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);} INLINE uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); } INLINE uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);} INLINE uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);} INLINE uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); } INLINE uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);} INLINE uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);} INLINE uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); } INLINE uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);} INLINE uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);} INLINE uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); } INLINE uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); } INLINE uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); } INLINE uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);} INLINE uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);} INLINE uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); } INLINE uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);} INLINE uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);} INLINE uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); } INLINE uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);} INLINE uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);} INLINE uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); } INLINE uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);} INLINE uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);} /* ---------------------------- Stack Functions --------------------------- */ /* Push/pull data from the stack */ INLINE void m68ki_push_16(uint value) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2); m68ki_write_16(REG_SP, value); } INLINE void m68ki_push_32(uint value) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4); m68ki_write_32(REG_SP, value); } INLINE uint m68ki_pull_16(void) { REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2); return m68ki_read_16(REG_SP-2); } INLINE uint m68ki_pull_32(void) { REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4); return m68ki_read_32(REG_SP-4); } /* ----------------------------- Program Flow ----------------------------- */ /* Jump to a new program location or vector. * These functions will also call the pc_changed callback if it was enabled * in m68kconf.h. */ INLINE void m68ki_jump(uint new_pc) { REG_PC = new_pc; } INLINE void m68ki_jump_vector(uint vector) { REG_PC = m68ki_read_data_32(vector<<2); } /* Branch to a new memory location. * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h. * So far I've found no problems with not calling pc_changed for 8 or 16 * bit branches. */ INLINE void m68ki_branch_8(uint offset) { REG_PC += MAKE_INT_8(offset); } INLINE void m68ki_branch_16(uint offset) { REG_PC += MAKE_INT_16(offset); } INLINE void m68ki_branch_32(uint offset) { REG_PC += offset; } /* ---------------------------- Status Register --------------------------- */ /* Set the S flag and change the active stack pointer. * Note that value MUST be 4 or 0. */ INLINE void m68ki_set_s_flag(uint value) { /* Backup the old stack pointer */ REG_SP_BASE[FLAG_S] = REG_SP; /* Set the S flag */ FLAG_S = value; /* Set the new stack pointer */ REG_SP = REG_SP_BASE[FLAG_S]; } /* Set the condition code register */ INLINE void m68ki_set_ccr(uint value) { FLAG_X = BIT_4(value) << 4; FLAG_N = BIT_3(value) << 4; FLAG_Z = !BIT_2(value); FLAG_V = BIT_1(value) << 6; FLAG_C = BIT_0(value) << 8; } /* Set the status register and check for interrupts */ INLINE void m68ki_set_sr(uint value) { /* Set the status register */ FLAG_T1 = BIT_F(value); FLAG_INT_MASK = value & 0x0700; m68ki_set_ccr(value); m68ki_set_s_flag((value >> 11) & 4); /* Check current IRQ status */ m68ki_check_interrupts(); } /* ------------------------- Exception Processing ------------------------- */ /* Initiate exception processing */ INLINE uint m68ki_init_exception(void) { /* Save the old status register */ uint sr = m68ki_get_sr(); /* Turn off trace flag, clear pending traces */ FLAG_T1 = 0; m68ki_clear_trace() /* Enter supervisor mode */ m68ki_set_s_flag(SFLAG_SET); return sr; } /* 3 word stack frame (68000 only) */ INLINE void m68ki_stack_frame_3word(uint pc, uint sr) { m68ki_push_32(pc); m68ki_push_16(sr); } #if M68K_EMULATE_ADDRESS_ERROR /* Bus error stack frame (68000 only). */ INLINE void m68ki_stack_frame_buserr(uint sr) { m68ki_push_32(REG_PC); m68ki_push_16(sr); m68ki_push_16(REG_IR); m68ki_push_32(m68ki_aerr_address); /* access address */ /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC * R/W 0 = write, 1 = read * I/N 0 = instruction, 1 = not * FC 3-bit function code */ m68ki_push_16(m68ki_aerr_write_mode | CPU_INSTR_MODE | m68ki_aerr_fc); } #endif /* Used for Group 2 exceptions. */ INLINE void m68ki_exception_trap(uint vector) { uint sr = m68ki_init_exception(); m68ki_stack_frame_3word(REG_PC, sr); m68ki_jump_vector(vector); /* Use up some clock cycles */ USE_CYCLES(CYC_EXCEPTION[vector]); } /* Trap#n stacks a 0 frame but behaves like group2 otherwise */ INLINE void m68ki_exception_trapN(uint vector) { uint sr = m68ki_init_exception(); m68ki_stack_frame_3word(REG_PC, sr); m68ki_jump_vector(vector); /* Use up some clock cycles */ USE_CYCLES(CYC_EXCEPTION[vector]); } #if M68K_EMULATE_TRACE /* Exception for trace mode */ INLINE void m68ki_exception_trace(void) { uint sr = m68ki_init_exception(); #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON CPU_INSTR_MODE = INSTRUCTION_NO; #endif /* M68K_EMULATE_ADDRESS_ERROR */ m68ki_stack_frame_3word(REG_PC, sr); m68ki_jump_vector(EXCEPTION_TRACE); /* Trace nullifies a STOP instruction */ CPU_STOPPED &= ~STOP_LEVEL_STOP; /* Use up some clock cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]); } #endif /* Exception for privilege violation */ static void m68ki_exception_privilege_violation(void) { uint sr = m68ki_init_exception(); #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON CPU_INSTR_MODE = INSTRUCTION_NO; #endif /* M68K_EMULATE_ADDRESS_ERROR */ m68ki_stack_frame_3word(REG_PC-2, sr); m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION); /* Use up some clock cycles and undo the instruction's cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]); } /* Exception for A-Line instructions */ INLINE void m68ki_exception_1010(void) { uint sr = m68ki_init_exception(); m68ki_stack_frame_3word(REG_PC-2, sr); m68ki_jump_vector(EXCEPTION_1010); /* Use up some clock cycles and undo the instruction's cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]); } /* Exception for F-Line instructions */ INLINE void m68ki_exception_1111(void) { uint sr = m68ki_init_exception(); m68ki_stack_frame_3word(REG_PC-2, sr); m68ki_jump_vector(EXCEPTION_1111); /* Use up some clock cycles and undo the instruction's cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]); } /* Exception for illegal instructions */ INLINE void m68ki_exception_illegal(void) { uint sr = m68ki_init_exception(); #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON CPU_INSTR_MODE = INSTRUCTION_NO; #endif /* M68K_EMULATE_ADDRESS_ERROR */ m68ki_stack_frame_3word(REG_PC-2, sr); m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION); /* Use up some clock cycles and undo the instruction's cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]); } #if M68K_EMULATE_ADDRESS_ERROR /* Exception for address error */ INLINE void m68ki_exception_address_error(void) { uint sr = m68ki_init_exception(); /* If we were processing a bus error, address error, or reset, * this is a catastrophic failure. * Halt the CPU */ if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET) { CPU_STOPPED = STOP_LEVEL_HALT; END_CYCLES(end_cycles); return; } CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET; /* Note: This is implemented for 68000 only! */ m68ki_stack_frame_buserr(sr); m68ki_jump_vector(EXCEPTION_ADDRESS_ERROR); /* Use up some clock cycles and undo the instruction's cycles */ USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ADDRESS_ERROR] - CYC_INSTRUCTION[REG_IR]); } #endif /* Service an interrupt request and start exception processing */ INLINE void m68ki_exception_interrupt(uint int_level) { uint vector, sr, new_pc; #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON CPU_INSTR_MODE = INSTRUCTION_NO; #endif /* M68K_EMULATE_ADDRESS_ERROR */ /* Turn off the stopped state */ CPU_STOPPED &= ~STOP_LEVEL_STOP; /* If we are halted, don't do anything */ if(CPU_STOPPED) return; /* Always use the autovectors. */ vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level; /* Start exception processing */ sr = m68ki_init_exception(); /* Set the interrupt mask to the level of the one being serviced */ FLAG_INT_MASK = int_level<<8; /* Acknowledge the interrupt */ m68ki_int_ack(int_level) /* Get the new PC */ new_pc = m68ki_read_data_32(vector<<2); /* If vector is uninitialized, call the uninitialized interrupt vector */ if(new_pc == 0) new_pc = m68ki_read_data_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2)); /* Generate a stack frame */ m68ki_stack_frame_3word(REG_PC, sr); m68ki_jump(new_pc); /* Update cycle count now */ USE_CYCLES(CYC_EXCEPTION[vector]); } /* ASG: Check for interrupts */ INLINE void m68ki_check_interrupts(void) { if(CPU_INT_LEVEL > FLAG_INT_MASK) m68ki_exception_interrupt(CPU_INT_LEVEL>>8); } #endif /* _MEM68K_H_ */ /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ #endif /* M68KCPU__HEADER */