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view musashi/m68kcpu.h @ 1769:8fe162bdb038 mame_interp
Merge from default
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Fri, 01 Mar 2019 14:17:29 -0800 |
parents | 2e57910fd641 |
children | 13abdc98379e |
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// license:BSD-3-Clause // copyright-holders:Karl Stenerud /* ======================================================================== */ /* ========================= LICENSING & COPYRIGHT ======================== */ /* ======================================================================== */ /* * MUSASHI * Version 4.50 * * A portable Motorola M680x0 processor emulation engine. * Copyright Karl Stenerud. All rights reserved. * */ #pragma once #ifndef __M68KCPU_H__ #define __M68KCPU_H__ #include "../m68k_core.h" typedef struct m68000_base_device m68000_base_device; struct m68000_base_device { m68k_context c; uint32_t cpu_type; uint32_t pc; uint32_t ppc; uint32_t stopped; /* Stopped state */ uint32_t pref_addr; uint32_t pref_data; uint32_t sr_mask; /* Implemented status register bits */ uint32_t instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */ uint32_t run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */ uint32_t s_flag; /* Supervisor */ uint32_t m_flag; /* Master/Interrupt state */ uint32_t x_flag; /* Extend */ uint32_t n_flag; /* Negative */ uint32_t not_z_flag; /* Zero, inverted for speedups */ uint32_t v_flag; /* Overflow */ uint32_t c_flag; /* Carry */ uint32_t int_mask; /* I0-I2 */ uint32_t t1_flag; /* Trace 1 */ uint32_t tracing; uint32_t ir; uint32_t cyc_bcc_notake_b; uint32_t cyc_bcc_notake_w; uint32_t cyc_dbcc_f_noexp; uint32_t cyc_dbcc_f_exp; uint32_t cyc_scc_r_true; uint32_t cyc_movem_w; uint32_t cyc_movem_l; uint32_t cyc_shift; uint32_t cyc_reset; void (**jump_table)(m68000_base_device *m68k); const uint8_t* cyc_instruction; const uint8_t* cyc_exception; void *read_pointers[24*1024/64]; void *write_pointers[24*1024/64]; }; /* Special interrupt acknowledge values. * Use these as special returns from the interrupt acknowledge callback * (specified later in this header). */ /* Causes an interrupt autovector (0x18 + interrupt level) to be taken. * This happens in a real 68K if VPA or AVEC is asserted during an interrupt * acknowledge cycle instead of DTACK. */ #define M68K_INT_ACK_AUTOVECTOR 0xffffffff /* Causes the spurious interrupt vector (0x18) to be taken * This happens in a real 68K if BERR is asserted during the interrupt * acknowledge cycle (i.e. no devices responded to the acknowledge). */ #define M68K_INT_ACK_SPURIOUS 0xfffffffe #include <limits.h> #if defined(__sun__) && defined(__svr4__) #undef REG_SP #undef REG_PC #undef REG_FP #endif /* ======================================================================== */ /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */ /* ======================================================================== */ /* Check for > 32bit sizes */ #define MAKE_INT_8(A) (int8_t)(A) #define MAKE_INT_16(A) (int16_t)(A) #define MAKE_INT_32(A) (int32_t)(A) /* ======================================================================== */ /* ============================ 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 /* CPU types for deciding what to emulate */ #define CPU_TYPE_000 (0x00000001) #define CPU_TYPE_008 (0x00000002) #define CPU_TYPE_010 (0x00000004) #define CPU_TYPE_EC020 (0x00000008) #define CPU_TYPE_020 (0x00000010) #define CPU_TYPE_EC030 (0x00000020) #define CPU_TYPE_030 (0x00000040) #define CPU_TYPE_EC040 (0x00000080) #define CPU_TYPE_LC040 (0x00000100) #define CPU_TYPE_040 (0x00000200) #define CPU_TYPE_SCC070 (0x00000400) #define CPU_TYPE_FSCPU32 (0x00000800) #define CPU_TYPE_COLDFIRE (0x00001000) /* Different ways to stop the CPU */ #define STOP_LEVEL_STOP 1 #define STOP_LEVEL_HALT 2 /* Used for 68000 address error processing */ #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 #define M68K_CACR_IBE 0x10 // Instruction Burst Enable #define M68K_CACR_CI 0x08 // Clear Instruction Cache #define M68K_CACR_CEI 0x04 // Clear Entry in Instruction Cache #define M68K_CACR_FI 0x02 // Freeze Instruction Cache #define M68K_CACR_EI 0x01 // Enable Instruction Cache /* ======================================================================== */ /* ================================ 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) #define GET_MSB_33(A) ((A) & 0x100000000U) /* 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 */ #define MASK_OUT_ABOVE_32(A) ((A) & ((uint64_t)0xffffffffU)) #define MASK_OUT_BELOW_32(A) ((A) & ~((uint64_t)0xffffffffU)) /* Shift & Rotate Macros. */ #define LSL(A, C) ((A) << (C)) #define LSR(A, C) ((A) >> (C)) /* 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) #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))) #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(M) (M)->c.dregs /* easy access to data and address regs */ #define REG_D(M) (M)->c.dregs #define REG_A(M) (M)->c.aregs #define REG_PPC(M) (M)->ppc #define REG_PC(M) (M)->pc #define REG_USP(M) (M)->c.aregs[8] #define REG_ISP(M) (M)->c.aregs[7] #define REG_MSP(M) (M)->c.aregs[7] #define REG_SP(M) (M)->c.aregs[7] /* ----------------------------- Configuration ---------------------------- */ /* These defines are dependant on the configuration defines in m68kconf.h */ /* Disable certain comparisons if we're not using all CPU types */ #define CPU_TYPE_IS_COLDFIRE(A) 0//((A) & (CPU_TYPE_COLDFIRE)) #define CPU_TYPE_IS_040_PLUS(A) 0//((A) & (CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_040_LESS(A) 1 #define CPU_TYPE_IS_030_PLUS(A) 0//((A) & (CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_030_LESS(A) 1 #define CPU_TYPE_IS_020_PLUS(A) 0//((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040 | CPU_TYPE_FSCPU32 | CPU_TYPE_COLDFIRE)) #define CPU_TYPE_IS_020_LESS(A) 1 #define CPU_TYPE_IS_020_VARIANT(A) 0//((A) & (CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_FSCPU32)) #define CPU_TYPE_IS_EC020_PLUS(A) 0//((A) & (CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040 | CPU_TYPE_FSCPU32 | CPU_TYPE_COLDFIRE)) #define CPU_TYPE_IS_EC020_LESS(A) 1//((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010 | CPU_TYPE_EC020)) #define CPU_TYPE_IS_010(A) 0//((A) == CPU_TYPE_010) #define CPU_TYPE_IS_010_PLUS(A) 0//((A) & (CPU_TYPE_010 | CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_EC030 | CPU_TYPE_030 | CPU_TYPE_040 | CPU_TYPE_EC040 | CPU_TYPE_FSCPU32 | CPU_TYPE_COLDFIRE)) #define CPU_TYPE_IS_010_LESS(A) 1//((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010)) #define CPU_TYPE_IS_000(A) 1//((A) == CPU_TYPE_000 || (A) == CPU_TYPE_008) /* -------------------------- 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(M) (REG_D(M)[((M)->ir >> 9) & 7]) #define DY(M) (REG_D(M)[(M)->ir & 7]) /* Address Register Isolation */ #define AX(M) (REG_A(M)[((M)->ir >> 9) & 7]) #define AY(M) (REG_A(M)[(M)->ir & 7]) /* Effective Address Calculations */ #define EA_AY_AI_8(M) AY(M) /* address register indirect */ #define EA_AY_AI_16(M) EA_AY_AI_8(M) #define EA_AY_AI_32(M) EA_AY_AI_8(M) #define EA_AY_PI_8(M) (AY(M)++) /* postincrement (size = byte) */ #define EA_AY_PI_16(M) ((AY(M)+=2)-2) /* postincrement (size = word) */ #define EA_AY_PI_32(M) ((AY(M)+=4)-4) /* postincrement (size = long) */ #define EA_AY_PD_8(M) (--AY(M)) /* predecrement (size = byte) */ #define EA_AY_PD_16(M) (AY(M)-=2) /* predecrement (size = word) */ #define EA_AY_PD_32(M) (AY(M)-=4) /* predecrement (size = long) */ #define EA_AY_DI_8(M) (AY(M)+MAKE_INT_16(m68ki_read_imm_16(M))) /* displacement */ #define EA_AY_DI_16(M) EA_AY_DI_8(M) #define EA_AY_DI_32(M) EA_AY_DI_8(M) #define EA_AY_IX_8(M) m68ki_get_ea_ix(M, AY(M)) /* indirect + index */ #define EA_AY_IX_16(M) EA_AY_IX_8(M) #define EA_AY_IX_32(M) EA_AY_IX_8(M) #define EA_AX_AI_8(M) AX(M) #define EA_AX_AI_16(M) EA_AX_AI_8(M) #define EA_AX_AI_32(M) EA_AX_AI_8(M) #define EA_AX_PI_8(M) (AX(M)++) #define EA_AX_PI_16(M) ((AX(M)+=2)-2) #define EA_AX_PI_32(M) ((AX(M)+=4)-4) #define EA_AX_PD_8(M) (--AX(M)) #define EA_AX_PD_16(M) (AX(M)-=2) #define EA_AX_PD_32(M) (AX(M)-=4) #define EA_AX_DI_8(M) (AX(M)+MAKE_INT_16(m68ki_read_imm_16(M))) #define EA_AX_DI_16(M) EA_AX_DI_8(M) #define EA_AX_DI_32(M) EA_AX_DI_8(M) #define EA_AX_IX_8(M) m68ki_get_ea_ix(M, AX(M)) #define EA_AX_IX_16(M) EA_AX_IX_8(M) #define EA_AX_IX_32(M) EA_AX_IX_8(M) #define EA_A7_PI_8(m68k) ((REG_A(m68k)[7]+=2)-2) #define EA_A7_PD_8(m68k) (REG_A(m68k)[7]-=2) #define EA_AW_8(m68k) MAKE_INT_16(m68ki_read_imm_16(m68k)) /* absolute word */ #define EA_AW_16(m68k) EA_AW_8(m68k) #define EA_AW_32(m68k) EA_AW_8(m68k) #define EA_AL_8(m68k) m68ki_read_imm_32(m68k) /* absolute long */ #define EA_AL_16(m68k) EA_AL_8(m68k) #define EA_AL_32(m68k) EA_AL_8(m68k) #define EA_PCDI_8(m68k) m68ki_get_ea_pcdi(m68k) /* pc indirect + displacement */ #define EA_PCDI_16(m68k) EA_PCDI_8(m68k) #define EA_PCDI_32(m68k) EA_PCDI_8(m68k) #define EA_PCIX_8(m68k) m68ki_get_ea_pcix(m68k) /* pc indirect + index */ #define EA_PCIX_16(m68k) EA_PCIX_8(m68k) #define EA_PCIX_32(m68k) EA_PCIX_8(m68k) #define OPER_I_8(m68k) m68ki_read_imm_8(m68k) #define OPER_I_16(m68k) m68ki_read_imm_16(m68k) #define OPER_I_32(m68k) m68ki_read_imm_32(m68k) /* --------------------------- Status Register ---------------------------- */ /* Flag Calculation Macros */ #define CFLAG_8(A) (A) #define CFLAG_16(A) ((A)>>8) #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) #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 #define MFLAG_SET 2 #define MFLAG_CLEAR 0 /* Turn flag values into 1 or 0 */ #define XFLAG_AS_1(M) (((M)->x_flag>>8)&1) #define NFLAG_AS_1(M) (((M)->n_flag>>7)&1) #define VFLAG_AS_1(M) (((M)->v_flag>>7)&1) #define ZFLAG_AS_1(M) (!(M)->not_z_flag) #define CFLAG_AS_1(M) (((M)->c_flag>>8)&1) /* Conditions */ #define COND_CS(M) ((M)->c_flag&0x100) #define COND_CC(M) (!COND_CS(M)) #define COND_VS(M) ((M)->v_flag&0x80) #define COND_VC(M) (!COND_VS(M)) #define COND_NE(M) (M)->not_z_flag #define COND_EQ(M) (!COND_NE(M)) #define COND_MI(M) ((M)->n_flag&0x80) #define COND_PL(M) (!COND_MI(M)) #define COND_LT(M) (((M)->n_flag^(M)->v_flag)&0x80) #define COND_GE(M) (!COND_LT(M)) #define COND_HI(M) (COND_CC(M) && COND_NE(M)) #define COND_LS(M) (COND_CS(M) || COND_EQ(M)) #define COND_GT(M) (COND_GE(M) && COND_NE(M)) #define COND_LE(M) (COND_LT(M) || COND_EQ(M)) /* Reversed conditions */ #define COND_NOT_CS(M) COND_CC(M) #define COND_NOT_CC(M) COND_CS(M) #define COND_NOT_VS(M) COND_VC(M) #define COND_NOT_VC(M) COND_VS(M) #define COND_NOT_NE(M) COND_EQ(M) #define COND_NOT_EQ(M) COND_NE(M) #define COND_NOT_MI(M) COND_PL(M) #define COND_NOT_PL(M) COND_MI(M) #define COND_NOT_LT(M) COND_GE(M) #define COND_NOT_GE(M) COND_LT(M) #define COND_NOT_HI(M) COND_LS(M) #define COND_NOT_LS(M) COND_HI(M) #define COND_NOT_GT(M) COND_LE(M) #define COND_NOT_LE(M) COND_GT(M) /* Not real conditions, but here for convenience */ #define COND_XS(M) ((M)->x_flag&0x100) #define COND_XC(M) (!COND_XS) /* Get the condition code register */ #define m68ki_get_ccr(M) ((COND_XS(M) >> 4) | \ (COND_MI(M) >> 4) | \ (COND_EQ(M) << 2) | \ (COND_VS(M) >> 6) | \ (COND_CS(M) >> 8)) /* Get the status register */ #define m68ki_get_sr(M) ((M)->t1_flag | \ /*(M)->t0_flag |*/ \ ((M)->s_flag << 11) | \ ((M)->m_flag << 11) | \ (M)->int_mask | \ m68ki_get_ccr(M)) /* ----------------------------- Read / Write ----------------------------- */ /* Read from the current address space */ uint8_t m68ki_read_8(m68000_base_device *m68k, uint32_t address); uint16_t m68ki_read_16(m68000_base_device *m68k, uint32_t address); static inline uint32_t m68ki_read_32(m68000_base_device *m68k, uint32_t address) { return m68ki_read_16(m68k, address) << 16 | m68ki_read_16(m68k, address+2); } /*#define m68ki_read_8(M, A) m68ki_read_8_fc (M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_16(M, A) m68ki_read_16_fc(M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_32(M, A) m68ki_read_32_fc(M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA)*/ /* Write to the current data space */ void m68ki_write_8(m68000_base_device *m68k, uint32_t address, uint8_t value); void m68ki_write_16(m68000_base_device *m68k, uint32_t address, uint16_t value); static inline void m68ki_write_32(m68000_base_device *m68k, uint32_t address, uint32_t value) { m68ki_write_16(m68k, address, value >> 16); m68ki_write_16(m68k, address+2, value); } /* #define m68ki_write_8(M, A, V) m68ki_write_8_fc (M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_16(M, A, V) m68ki_write_16_fc(M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_32(M, A, V) m68ki_write_32_fc(M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_32_pd(M, A, V) m68ki_write_32_pd_fc(M, A, (M)->s_flag | FUNCTION_CODE_USER_DATA, V)*/ /* map read immediate 8 to read immediate 16 */ #define m68ki_read_imm_8(M) MASK_OUT_ABOVE_8(m68ki_read_imm_16(M)) /* ======================================================================== */ /* =============================== PROTOTYPES ============================= */ /* ======================================================================== */ union fp_reg { uint64_t i; double f; }; void m68ki_exception_interrupt(m68000_base_device *m68k, uint32_t int_level); extern const uint8_t m68ki_shift_8_table[]; extern const uint16_t m68ki_shift_16_table[]; extern const uint32_t m68ki_shift_32_table[]; extern const uint8_t m68ki_exception_cycle_table[][256]; extern const uint8_t m68ki_ea_idx_cycle_table[]; /* Read data immediately after the program counter */ static inline uint32_t m68ki_read_imm_16(m68000_base_device *m68k); static inline uint32_t m68ki_read_imm_32(m68000_base_device *m68k); /* Write data with specific function code */ static inline void m68ki_write_8_fc (m68000_base_device *m68k, uint32_t address, uint32_t fc, uint32_t value); static inline void m68ki_write_16_fc(m68000_base_device *m68k, uint32_t address, uint32_t fc, uint32_t value); static inline void m68ki_write_32_fc(m68000_base_device *m68k, uint32_t address, uint32_t fc, uint32_t value); /* Indexed and PC-relative ea fetching */ static inline uint32_t m68ki_get_ea_pcdi(m68000_base_device *m68k); static inline uint32_t m68ki_get_ea_pcix(m68000_base_device *m68k); static inline uint32_t m68ki_get_ea_ix(m68000_base_device *m68k, uint32_t An); /* Operand fetching */ static inline uint32_t OPER_AY_AI_8(m68000_base_device *m68k); static inline uint32_t OPER_AY_AI_16(m68000_base_device *m68k); static inline uint32_t OPER_AY_AI_32(m68000_base_device *m68k); static inline uint32_t OPER_AY_PI_8(m68000_base_device *m68k); static inline uint32_t OPER_AY_PI_16(m68000_base_device *m68k); static inline uint32_t OPER_AY_PI_32(m68000_base_device *m68k); static inline uint32_t OPER_AY_PD_8(m68000_base_device *m68k); static inline uint32_t OPER_AY_PD_16(m68000_base_device *m68k); static inline uint32_t OPER_AY_PD_32(m68000_base_device *m68k); static inline uint32_t OPER_AY_DI_8(m68000_base_device *m68k); static inline uint32_t OPER_AY_DI_16(m68000_base_device *m68k); static inline uint32_t OPER_AY_DI_32(m68000_base_device *m68k); static inline uint32_t OPER_AY_IX_8(m68000_base_device *m68k); static inline uint32_t OPER_AY_IX_16(m68000_base_device *m68k); static inline uint32_t OPER_AY_IX_32(m68000_base_device *m68k); static inline uint32_t OPER_AX_AI_8(m68000_base_device *m68k); static inline uint32_t OPER_AX_AI_16(m68000_base_device *m68k); static inline uint32_t OPER_AX_AI_32(m68000_base_device *m68k); static inline uint32_t OPER_AX_PI_8(m68000_base_device *m68k); static inline uint32_t OPER_AX_PI_16(m68000_base_device *m68k); static inline uint32_t OPER_AX_PI_32(m68000_base_device *m68k); static inline uint32_t OPER_AX_PD_8(m68000_base_device *m68k); static inline uint32_t OPER_AX_PD_16(m68000_base_device *m68k); static inline uint32_t OPER_AX_PD_32(m68000_base_device *m68k); static inline uint32_t OPER_AX_DI_8(m68000_base_device *m68k); static inline uint32_t OPER_AX_DI_16(m68000_base_device *m68k); static inline uint32_t OPER_AX_DI_32(m68000_base_device *m68k); static inline uint32_t OPER_AX_IX_8(m68000_base_device *m68k); static inline uint32_t OPER_AX_IX_16(m68000_base_device *m68k); static inline uint32_t OPER_AX_IX_32(m68000_base_device *m68k); static inline uint32_t OPER_A7_PI_8(m68000_base_device *m68k); static inline uint32_t OPER_A7_PD_8(m68000_base_device *m68k); static inline uint32_t OPER_AW_8(m68000_base_device *m68k); static inline uint32_t OPER_AW_16(m68000_base_device *m68k); static inline uint32_t OPER_AW_32(m68000_base_device *m68k); static inline uint32_t OPER_AL_8(m68000_base_device *m68k); static inline uint32_t OPER_AL_16(m68000_base_device *m68k); static inline uint32_t OPER_AL_32(m68000_base_device *m68k); static inline uint32_t OPER_PCDI_8(m68000_base_device *m68k); static inline uint32_t OPER_PCDI_16(m68000_base_device *m68k); static inline uint32_t OPER_PCDI_32(m68000_base_device *m68k); static inline uint32_t OPER_PCIX_8(m68000_base_device *m68k); static inline uint32_t OPER_PCIX_16(m68000_base_device *m68k); static inline uint32_t OPER_PCIX_32(m68000_base_device *m68k); /* Stack operations */ static inline void m68ki_push_16(m68000_base_device *m68k, uint32_t value); static inline void m68ki_push_32(m68000_base_device *m68k, uint32_t value); static inline uint32_t m68ki_pull_16(m68000_base_device *m68k); static inline uint32_t m68ki_pull_32(m68000_base_device *m68k); /* Program flow operations */ static inline void m68ki_jump(m68000_base_device *m68k, uint32_t new_pc); static inline void m68ki_jump_vector(m68000_base_device *m68k, uint32_t vector); static inline void m68ki_branch_8(m68000_base_device *m68k, uint32_t offset); static inline void m68ki_branch_16(m68000_base_device *m68k, uint32_t offset); static inline void m68ki_branch_32(m68000_base_device *m68k, uint32_t offset); /* Status register operations. */ static inline void m68ki_set_s_flag(m68000_base_device *m68k, uint32_t value); /* Only bit 2 of value should be set (i.e. 4 or 0) */ static inline void m68ki_set_sm_flag(m68000_base_device *m68k, uint32_t value); /* only bits 1 and 2 of value should be set */ static inline void m68ki_set_ccr(m68000_base_device *m68k, uint32_t value); /* set the condition code register */ static inline void m68ki_set_sr(m68000_base_device *m68k, uint32_t value); /* set the status register */ static inline void m68ki_set_sr_noint(m68000_base_device *m68k, uint32_t value); /* set the status register */ /* Exception processing */ static inline uint32_t m68ki_init_exception(m68000_base_device *m68k); /* Initial exception processing */ static inline void m68ki_stack_frame_3word(m68000_base_device *m68k, uint32_t pc, uint32_t sr); /* Stack various frame types */ static inline void m68ki_stack_frame_buserr(m68000_base_device *m68k, uint32_t sr); static inline void m68ki_stack_frame_0000(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector); static inline void m68ki_stack_frame_0001(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector); static inline void m68ki_stack_frame_0010(m68000_base_device *m68k, uint32_t sr, uint32_t vector); static inline void m68ki_stack_frame_1000(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector); static inline void m68ki_stack_frame_1010(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address); static inline void m68ki_stack_frame_1011(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address); static inline void m68ki_stack_frame_0111(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address, uint8_t in_mmu); static inline void m68ki_exception_trap(m68000_base_device *m68k, uint32_t vector); static inline void m68ki_exception_trapN(m68000_base_device *m68k, uint32_t vector); static inline void m68ki_exception_trace(m68000_base_device *m68k); static inline void m68ki_exception_privilege_violation(m68000_base_device *m68k); static inline void m68ki_exception_1010(m68000_base_device *m68k); static inline void m68ki_exception_1111(m68000_base_device *m68k); static inline void m68ki_exception_illegal(m68000_base_device *m68k); static inline void m68ki_exception_format_error(m68000_base_device *m68k); static inline void m68ki_exception_address_error(m68000_base_device *m68k); static inline void m68ki_check_interrupts(m68000_base_device *m68k); /* ASG: check for interrupts */ /* quick disassembly (used for logging) */ char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type); void m68k_cpu_execute(m68000_base_device *this); void m68k_reset_cpu(m68000_base_device *this); void m68k_init_cpu_m68000(m68000_base_device *this); #define m68ki_trace_t0(M) #define m68ki_trace_t1(m68k) m68k->tracing = m68k->t1_flag /* Clear all tracing */ #define m68ki_clear_trace(m68k) m68k->tracing = 0 /* Cause a trace exception if we are tracing */ #define m68ki_exception_if_trace(m68k) if(m68k->tracing) m68ki_exception_trace(m68k) /* ======================================================================== */ /* =========================== UTILITY FUNCTIONS ========================== */ /* ======================================================================== */ /* Special call to simulate undocumented 68k behavior when move.l with a * predecrement destination mode is executed. * A real 68k first writes the high word to [address+2], and then writes the * low word to [address]. */ static inline void m68kx_write_memory_32_pd(m68000_base_device *m68k, unsigned int address, unsigned int value) { m68ki_write_16(m68k, address, value); m68ki_write_16(m68k, address, value >> 16); } /* ---------------------------- Read Immediate ---------------------------- */ /* Handles all immediate reads, does address error check, function code setting, * and prefetching if they are enabled in m68kconf.h */ static inline uint32_t m68ki_read_imm_16(m68000_base_device *m68k) { uint32_t result; if(REG_PC(m68k) != m68k->pref_addr) { m68k->pref_data = m68ki_read_16(m68k, REG_PC(m68k)); m68k->pref_addr = REG_PC(m68k); } result = MASK_OUT_ABOVE_16(m68k->pref_data); REG_PC(m68k) += 2; return result; } static inline uint32_t m68ki_read_imm_32(m68000_base_device *m68k) { uint32_t temp_val; if(REG_PC(m68k) != m68k->pref_addr) { m68k->pref_addr = REG_PC(m68k); m68k->pref_data = m68ki_read_16(m68k, m68k->pref_addr); } temp_val = MASK_OUT_ABOVE_16(m68k->pref_data); REG_PC(m68k) += 2; m68k->pref_addr = REG_PC(m68k); m68k->pref_data = m68ki_read_16(m68k, m68k->pref_addr); temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | MASK_OUT_ABOVE_16(m68k->pref_data)); REG_PC(m68k) += 2; m68k->pref_data = m68ki_read_16(m68k, REG_PC(m68k)); m68k->pref_addr = REG_PC(m68k); return temp_val; } /* --------------------- Effective Address Calculation -------------------- */ /* The program counter relative addressing modes cause operands to be * retrieved from program space, not data space. */ static inline uint32_t m68ki_get_ea_pcdi(m68000_base_device *m68k) { uint32_t old_pc = REG_PC(m68k); return old_pc + MAKE_INT_16(m68ki_read_imm_16(m68k)); } static inline uint32_t m68ki_get_ea_pcix(m68000_base_device *m68k) { return m68ki_get_ea_ix(m68k, REG_PC(m68k)); } /* 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 */ static inline uint32_t m68ki_get_ea_ix(m68000_base_device *m68k, uint32_t An) { /* An = base register */ uint32_t extension = m68ki_read_imm_16(m68k); uint32_t Xn = 0; /* Index register */ uint32_t bd = 0; /* Base Displacement */ uint32_t od = 0; /* Outer Displacement */ /* Calculate index */ Xn = REG_DA(m68k)[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 */ static inline uint32_t OPER_AY_AI_8(m68000_base_device *m68k) {uint32_t ea = EA_AY_AI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AY_AI_16(m68000_base_device *m68k) {uint32_t ea = EA_AY_AI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AY_AI_32(m68000_base_device *m68k) {uint32_t ea = EA_AY_AI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AY_PI_8(m68000_base_device *m68k) {uint32_t ea = EA_AY_PI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AY_PI_16(m68000_base_device *m68k) {uint32_t ea = EA_AY_PI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AY_PI_32(m68000_base_device *m68k) {uint32_t ea = EA_AY_PI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AY_PD_8(m68000_base_device *m68k) {uint32_t ea = EA_AY_PD_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AY_PD_16(m68000_base_device *m68k) {uint32_t ea = EA_AY_PD_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AY_PD_32(m68000_base_device *m68k) {uint32_t ea = EA_AY_PD_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AY_DI_8(m68000_base_device *m68k) {uint32_t ea = EA_AY_DI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AY_DI_16(m68000_base_device *m68k) {uint32_t ea = EA_AY_DI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AY_DI_32(m68000_base_device *m68k) {uint32_t ea = EA_AY_DI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AY_IX_8(m68000_base_device *m68k) {uint32_t ea = EA_AY_IX_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AY_IX_16(m68000_base_device *m68k) {uint32_t ea = EA_AY_IX_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AY_IX_32(m68000_base_device *m68k) {uint32_t ea = EA_AY_IX_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AX_AI_8(m68000_base_device *m68k) {uint32_t ea = EA_AX_AI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AX_AI_16(m68000_base_device *m68k) {uint32_t ea = EA_AX_AI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AX_AI_32(m68000_base_device *m68k) {uint32_t ea = EA_AX_AI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AX_PI_8(m68000_base_device *m68k) {uint32_t ea = EA_AX_PI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AX_PI_16(m68000_base_device *m68k) {uint32_t ea = EA_AX_PI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AX_PI_32(m68000_base_device *m68k) {uint32_t ea = EA_AX_PI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AX_PD_8(m68000_base_device *m68k) {uint32_t ea = EA_AX_PD_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AX_PD_16(m68000_base_device *m68k) {uint32_t ea = EA_AX_PD_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AX_PD_32(m68000_base_device *m68k) {uint32_t ea = EA_AX_PD_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AX_DI_8(m68000_base_device *m68k) {uint32_t ea = EA_AX_DI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AX_DI_16(m68000_base_device *m68k) {uint32_t ea = EA_AX_DI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AX_DI_32(m68000_base_device *m68k) {uint32_t ea = EA_AX_DI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AX_IX_8(m68000_base_device *m68k) {uint32_t ea = EA_AX_IX_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AX_IX_16(m68000_base_device *m68k) {uint32_t ea = EA_AX_IX_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AX_IX_32(m68000_base_device *m68k) {uint32_t ea = EA_AX_IX_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_A7_PI_8(m68000_base_device *m68k) {uint32_t ea = EA_A7_PI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_A7_PD_8(m68000_base_device *m68k) {uint32_t ea = EA_A7_PD_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AW_8(m68000_base_device *m68k) {uint32_t ea = EA_AW_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AW_16(m68000_base_device *m68k) {uint32_t ea = EA_AW_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AW_32(m68000_base_device *m68k) {uint32_t ea = EA_AW_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_AL_8(m68000_base_device *m68k) {uint32_t ea = EA_AL_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_AL_16(m68000_base_device *m68k) {uint32_t ea = EA_AL_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_AL_32(m68000_base_device *m68k) {uint32_t ea = EA_AL_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_PCDI_8(m68000_base_device *m68k) {uint32_t ea = EA_PCDI_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_PCDI_16(m68000_base_device *m68k) {uint32_t ea = EA_PCDI_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_PCDI_32(m68000_base_device *m68k) {uint32_t ea = EA_PCDI_32(m68k); return m68ki_read_32(m68k, ea);} static inline uint32_t OPER_PCIX_8(m68000_base_device *m68k) {uint32_t ea = EA_PCIX_8(m68k); return m68ki_read_8(m68k, ea); } static inline uint32_t OPER_PCIX_16(m68000_base_device *m68k) {uint32_t ea = EA_PCIX_16(m68k); return m68ki_read_16(m68k, ea);} static inline uint32_t OPER_PCIX_32(m68000_base_device *m68k) {uint32_t ea = EA_PCIX_32(m68k); return m68ki_read_32(m68k, ea);} /* ---------------------------- Stack Functions --------------------------- */ /* Push/pull data from the stack */ static inline void m68ki_push_16(m68000_base_device *m68k, uint32_t value) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) - 2); m68ki_write_16(m68k, REG_SP(m68k), value); } static inline void m68ki_push_32(m68000_base_device *m68k, uint32_t value) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) - 4); m68ki_write_32(m68k, REG_SP(m68k), value); } static inline uint32_t m68ki_pull_16(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) + 2); return m68ki_read_16(m68k, REG_SP(m68k)-2); } static inline uint32_t m68ki_pull_32(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) + 4); return m68ki_read_32(m68k, REG_SP(m68k)-4); } /* Increment/decrement the stack as if doing a push/pull but * don't do any memory access. */ static inline void m68ki_fake_push_16(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) - 2); } static inline void m68ki_fake_push_32(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) - 4); } static inline void m68ki_fake_pull_16(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) + 2); } static inline void m68ki_fake_pull_32(m68000_base_device *m68k) { REG_SP(m68k) = MASK_OUT_ABOVE_32(REG_SP(m68k) + 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. */ static inline void m68ki_jump(m68000_base_device *m68k, uint32_t new_pc) { REG_PC(m68k) = new_pc; } static inline void m68ki_jump_vector(m68000_base_device *m68k, uint32_t vector) { REG_PC(m68k) = (vector<<2); REG_PC(m68k) = m68ki_read_32(m68k, REG_PC(m68k)); } /* 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. */ static inline void m68ki_branch_8(m68000_base_device *m68k, uint32_t offset) { REG_PC(m68k) += MAKE_INT_8(offset); } static inline void m68ki_branch_16(m68000_base_device *m68k, uint32_t offset) { REG_PC(m68k) += MAKE_INT_16(offset); } static inline void m68ki_branch_32(m68000_base_device *m68k, uint32_t offset) { REG_PC(m68k) += offset; } /* ---------------------------- Status Register --------------------------- */ /* Set the S flag and change the active stack pointer. * Note that value MUST be 4 or 0. */ static inline void m68ki_set_s_flag(m68000_base_device *m68k, uint32_t value) { /* Backup the old stack pointer */ uint32_t old = REG_SP(m68k); //REG_SP_BASE(m68k)[m68k->s_flag | ((m68k->s_flag>>1) & m68k->m_flag)] = REG_SP(m68k); /* Set the S flag */ if (value != m68k->s_flag) { m68k->s_flag = value; /* Set the new stack pointer */ REG_SP(m68k) = REG_USP(m68k); REG_USP(m68k) = old; } //REG_SP(m68k) = REG_SP_BASE(m68k)[m68k->s_flag | ((m68k->s_flag>>1) & m68k->m_flag)]; } /* Set the S and M flags and change the active stack pointer. * Note that value MUST be 0, 2, 4, or 6 (bit2 = S, bit1 = M). */ static inline void m68ki_set_sm_flag(m68000_base_device *m68k, uint32_t value) { m68ki_set_s_flag(m68k, value & 4); } /* Set the S and M flags. Don't touch the stack pointer. */ static inline void m68ki_set_sm_flag_nosp(m68000_base_device *m68k, uint32_t value) { /* Set the S and M flags */ m68k->s_flag = value & SFLAG_SET; //m68k->m_flag = value & MFLAG_SET; } /* Set the condition code register */ static inline void m68ki_set_ccr(m68000_base_device *m68k, uint32_t value) { m68k->x_flag = BIT_4(value) << 4; m68k->n_flag = BIT_3(value) << 4; m68k->not_z_flag = !BIT_2(value); m68k->v_flag = BIT_1(value) << 6; m68k->c_flag = BIT_0(value) << 8; } /* Set the status register but don't check for interrupts */ static inline void m68ki_set_sr_noint(m68000_base_device *m68k, uint32_t value) { /* Mask out the "unimplemented" bits */ value &= m68k->sr_mask; /* Now set the status register */ m68k->t1_flag = BIT_F(value); //m68k->t0_flag = BIT_E(value); m68k->int_mask = value & 0x0700; m68k->c.target_cycle = m68k->c.current_cycle; m68ki_set_ccr(m68k, value); m68ki_set_sm_flag(m68k, (value >> 11) & 6); } /* Set the status register but don't check for interrupts nor * change the stack pointer */ static inline void m68ki_set_sr_noint_nosp(m68000_base_device *m68k, uint32_t value) { /* Mask out the "unimplemented" bits */ value &= m68k->sr_mask; /* Now set the status register */ m68k->t1_flag = BIT_F(value); //m68k->t0_flag = BIT_E(value); m68k->int_mask = value & 0x0700; m68k->c.target_cycle = m68k->c.current_cycle; m68ki_set_ccr(m68k, value); m68ki_set_sm_flag_nosp(m68k, (value >> 11) & 6); } /* Set the status register and check for interrupts */ static inline void m68ki_set_sr(m68000_base_device *m68k, uint32_t value) { m68ki_set_sr_noint(m68k, value); m68ki_check_interrupts(m68k); } /* ------------------------- Exception Processing ------------------------- */ /* Initiate exception processing */ static inline uint32_t m68ki_init_exception(m68000_base_device *m68k) { /* Save the old status register */ uint32_t sr = m68ki_get_sr(m68k); /* Turn off trace flag, clear pending traces */ m68k->t1_flag = 0;//m68k->t0_flag = 0; m68ki_clear_trace(m68k); /* Enter supervisor mode */ m68ki_set_s_flag(m68k, SFLAG_SET); return sr; } /* 3 word stack frame (68000 only) */ static inline void m68ki_stack_frame_3word(m68000_base_device *m68k, uint32_t pc, uint32_t sr) { m68ki_push_32(m68k, pc); m68ki_push_16(m68k, sr); } /* Format 0 stack frame. * This is the standard stack frame for 68010+. */ static inline void m68ki_stack_frame_0000(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector) { /* Stack a 3-word frame if we are 68000 */ if(m68k->cpu_type == CPU_TYPE_000 || m68k->cpu_type == CPU_TYPE_008) { m68ki_stack_frame_3word(m68k, pc, sr); return; } m68ki_push_16(m68k, vector<<2); m68ki_push_32(m68k, pc); m68ki_push_16(m68k, sr); } /* Format 1 stack frame (68020). * For 68020, this is the 4 word throwaway frame. */ static inline void m68ki_stack_frame_0001(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector) { m68ki_push_16(m68k, 0x1000 | (vector<<2)); m68ki_push_32(m68k, pc); m68ki_push_16(m68k, sr); } /* Format 2 stack frame. * This is used only by 68020 for trap exceptions. */ static inline void m68ki_stack_frame_0010(m68000_base_device *m68k, uint32_t sr, uint32_t vector) { m68ki_push_32(m68k, REG_PPC(m68k)); m68ki_push_16(m68k, 0x2000 | (vector<<2)); m68ki_push_32(m68k, REG_PC(m68k)); m68ki_push_16(m68k, sr); } /* Bus error stack frame (68000 only). */ static inline void m68ki_stack_frame_buserr(m68000_base_device *m68k, uint32_t sr) { m68ki_push_32(m68k, REG_PC(m68k)); m68ki_push_16(m68k, sr); m68ki_push_16(m68k, m68k->ir); m68ki_push_32(m68k, 0/*m68k->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(m68k, 0/*m68k->aerr_write_mode | m68k->instr_mode | m68k->aerr_fc*/); } /* Format 8 stack frame (68010). * 68010 only. This is the 29 word bus/address error frame. */ static inline void m68ki_stack_frame_1000(m68000_base_device *m68k, uint32_t pc, uint32_t sr, uint32_t vector) { /* VERSION * NUMBER * INTERNAL INFORMATION, 16 WORDS */ m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); m68ki_fake_push_32(m68k); /* INSTRUCTION INPUT BUFFER */ m68ki_push_16(m68k, 0); /* UNUSED, RESERVED (not written) */ m68ki_fake_push_16(m68k); /* DATA INPUT BUFFER */ m68ki_push_16(m68k, 0); /* UNUSED, RESERVED (not written) */ m68ki_fake_push_16(m68k); /* DATA OUTPUT BUFFER */ m68ki_push_16(m68k, 0); /* UNUSED, RESERVED (not written) */ m68ki_fake_push_16(m68k); /* FAULT ADDRESS */ m68ki_push_32(m68k, 0); /* SPECIAL STATUS WORD */ m68ki_push_16(m68k, 0); /* 1000, VECTOR OFFSET */ m68ki_push_16(m68k, 0x8000 | (vector<<2)); /* PROGRAM COUNTER */ m68ki_push_32(m68k, pc); /* STATUS REGISTER */ m68ki_push_16(m68k, sr); } /* Format A stack frame (short bus fault). * This is used only by 68020 for bus fault and address error * if the error happens at an instruction boundary. * PC stacked is address of next instruction. */ static inline void m68ki_stack_frame_1010(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address) { //int orig_rw = m68k->mmu_tmp_buserror_rw; // this gets splatted by the following pushes, so save it now //int orig_fc = m68k->mmu_tmp_buserror_fc; /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* DATA OUTPUT BUFFER (2 words) */ m68ki_push_32(m68k, 0); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* DATA CYCLE FAULT ADDRESS (2 words) */ m68ki_push_32(m68k, fault_address); /* INSTRUCTION PIPE STAGE B */ m68ki_push_16(m68k, 0); /* INSTRUCTION PIPE STAGE C */ m68ki_push_16(m68k, 0); /* SPECIAL STATUS REGISTER */ // set bit for: Rerun Faulted bus Cycle, or run pending prefetch // set FC m68ki_push_16(m68k, 0x0100 /*| orig_fc | orig_rw<<6*/); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* 1010, VECTOR OFFSET */ m68ki_push_16(m68k, 0xa000 | (vector<<2)); /* PROGRAM COUNTER */ m68ki_push_32(m68k, pc); /* STATUS REGISTER */ m68ki_push_16(m68k, sr); } /* Format B stack frame (long bus fault). * This is used only by 68020 for bus fault and address error * if the error happens during instruction execution. * PC stacked is address of instruction in progress. */ static inline void m68ki_stack_frame_1011(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address) { /*int orig_rw = m68k->mmu_tmp_buserror_rw; // this gets splatted by the following pushes, so save it now int orig_fc = m68k->mmu_tmp_buserror_fc;*/ /* INTERNAL REGISTERS (18 words) */ m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); /* VERSION# (4 bits), INTERNAL INFORMATION */ m68ki_push_16(m68k, 0); /* INTERNAL REGISTERS (3 words) */ m68ki_push_32(m68k, 0); m68ki_push_16(m68k, 0); /* DATA INTPUT BUFFER (2 words) */ m68ki_push_32(m68k, 0); /* INTERNAL REGISTERS (2 words) */ m68ki_push_32(m68k, 0); /* STAGE B ADDRESS (2 words) */ m68ki_push_32(m68k, 0); /* INTERNAL REGISTER (4 words) */ m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); /* DATA OUTPUT BUFFER (2 words) */ m68ki_push_32(m68k, 0); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* DATA CYCLE FAULT ADDRESS (2 words) */ m68ki_push_32(m68k, fault_address); /* INSTRUCTION PIPE STAGE B */ m68ki_push_16(m68k, 0); /* INSTRUCTION PIPE STAGE C */ m68ki_push_16(m68k, 0); /* SPECIAL STATUS REGISTER */ m68ki_push_16(m68k, 0x0100/* | orig_fc | orig_rw<<6*/); /* INTERNAL REGISTER */ m68ki_push_16(m68k, 0); /* 1011, VECTOR OFFSET */ m68ki_push_16(m68k, 0xb000 | (vector<<2)); /* PROGRAM COUNTER */ m68ki_push_32(m68k, pc); /* STATUS REGISTER */ m68ki_push_16(m68k, sr); } /* Type 7 stack frame (access fault). * This is used by the 68040 for bus fault and mmu trap * 30 words */ static inline void m68ki_stack_frame_0111(m68000_base_device *m68k, uint32_t sr, uint32_t vector, uint32_t pc, uint32_t fault_address, uint8_t in_mmu) { /*int orig_rw = m68k->mmu_tmp_buserror_rw; // this gets splatted by the following pushes, so save it now int orig_fc = m68k->mmu_tmp_buserror_fc;*/ /* INTERNAL REGISTERS (18 words) */ m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); m68ki_push_32(m68k, 0); /* FAULT ADDRESS (2 words) */ m68ki_push_32(m68k, fault_address); /* INTERNAL REGISTERS (3 words) */ m68ki_push_32(m68k, 0); m68ki_push_16(m68k, 0); /* SPECIAL STATUS REGISTER (1 word) */ m68ki_push_16(m68k, 0/*(in_mmu ? 0x400 : 0) | orig_fc | (orig_rw<<8)*/); /* EFFECTIVE ADDRESS (2 words) */ m68ki_push_32(m68k, fault_address); /* 0111, VECTOR OFFSET (1 word) */ m68ki_push_16(m68k, 0x7000 | (vector<<2)); /* PROGRAM COUNTER (2 words) */ m68ki_push_32(m68k, pc); /* STATUS REGISTER (1 word) */ m68ki_push_16(m68k, sr); } /* Used for Group 2 exceptions. * These stack a type 2 frame on the 020. */ static inline void m68ki_exception_trap(m68000_base_device *m68k, uint32_t vector) { uint32_t sr = m68ki_init_exception(m68k); if(CPU_TYPE_IS_010_LESS(m68k->cpu_type)) m68ki_stack_frame_0000(m68k, REG_PC(m68k), sr, vector); else m68ki_stack_frame_0010(m68k, sr, vector); m68ki_jump_vector(m68k, vector); /* Use up some clock cycles */ m68k->c.current_cycle += m68k->cyc_exception[vector]; } /* Trap#n stacks a 0 frame but behaves like group2 otherwise */ static inline void m68ki_exception_trapN(m68000_base_device *m68k, uint32_t vector) { uint32_t sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PC(m68k), sr, vector); m68ki_jump_vector(m68k, vector); /* Use up some clock cycles */ m68k->c.current_cycle += m68k->cyc_exception[vector]; } /* Exception for trace mode */ static inline void m68ki_exception_trace(m68000_base_device *m68k) { uint32_t sr = m68ki_init_exception(m68k); if(CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { if(CPU_TYPE_IS_000(m68k->cpu_type)) { m68k->instr_mode = INSTRUCTION_NO; } m68ki_stack_frame_0000(m68k, REG_PC(m68k), sr, EXCEPTION_TRACE); } else m68ki_stack_frame_0010(m68k, sr, EXCEPTION_TRACE); m68ki_jump_vector(m68k, EXCEPTION_TRACE); /* Trace nullifies a STOP instruction */ m68k->stopped &= ~STOP_LEVEL_STOP; /* Use up some clock cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_TRACE]; } /* Exception for privilege violation */ static inline void m68ki_exception_privilege_violation(m68000_base_device *m68k) { uint32_t sr = m68ki_init_exception(m68k); if(CPU_TYPE_IS_000(m68k->cpu_type)) { m68k->instr_mode = INSTRUCTION_NO; } m68ki_stack_frame_0000(m68k, REG_PPC(m68k), sr, EXCEPTION_PRIVILEGE_VIOLATION); m68ki_jump_vector(m68k, EXCEPTION_PRIVILEGE_VIOLATION); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_PRIVILEGE_VIOLATION] - m68k->cyc_instruction[m68k->ir]; } /* Exception for A-Line instructions */ static inline void m68ki_exception_1010(m68000_base_device *m68k) { uint32_t sr; sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PPC(m68k), sr, EXCEPTION_1010); m68ki_jump_vector(m68k, EXCEPTION_1010); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_1010] - m68k->cyc_instruction[m68k->ir]; } /* Exception for F-Line instructions */ static inline void m68ki_exception_1111(m68000_base_device *m68k) { uint32_t sr; sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PPC(m68k), sr, EXCEPTION_1111); m68ki_jump_vector(m68k, EXCEPTION_1111); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_1111] - m68k->cyc_instruction[m68k->ir]; } /* Exception for illegal instructions */ static inline void m68ki_exception_illegal(m68000_base_device *m68k) { uint32_t sr; sr = m68ki_init_exception(m68k); if(CPU_TYPE_IS_000(m68k->cpu_type)) { m68k->instr_mode = INSTRUCTION_NO; } m68ki_stack_frame_0000(m68k, REG_PPC(m68k), sr, EXCEPTION_ILLEGAL_INSTRUCTION); m68ki_jump_vector(m68k, EXCEPTION_ILLEGAL_INSTRUCTION); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_ILLEGAL_INSTRUCTION] - m68k->cyc_instruction[m68k->ir]; } /* Exception for format errror in RTE */ static inline void m68ki_exception_format_error(m68000_base_device *m68k) { uint32_t sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PC(m68k), sr, EXCEPTION_FORMAT_ERROR); m68ki_jump_vector(m68k, EXCEPTION_FORMAT_ERROR); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_FORMAT_ERROR] - m68k->cyc_instruction[m68k->ir]; } /* Exception for address error */ static inline void m68ki_exception_address_error(m68000_base_device *m68k) { uint32_t sr = m68ki_init_exception(m68k); /* If we were processing a bus error, address error, or reset, * this is a catastrophic failure. * Halt the CPU */ if(m68k->run_mode == RUN_MODE_BERR_AERR_RESET) { //m68k->/*memory.*/read8(0x00ffff01); m68k->stopped = STOP_LEVEL_HALT; return; } m68k->run_mode = RUN_MODE_BERR_AERR_RESET; /* Note: This is implemented for 68000 only! */ m68ki_stack_frame_buserr(m68k, sr); m68ki_jump_vector(m68k, EXCEPTION_ADDRESS_ERROR); /* Use up some clock cycles and undo the instruction's cycles */ m68k->c.current_cycle += m68k->cyc_exception[EXCEPTION_ADDRESS_ERROR] - m68k->cyc_instruction[m68k->ir]; } /* ASG: Check for interrupts */ static inline void m68ki_check_interrupts(m68000_base_device *m68k) { /*if(m68k->nmi_pending) { m68k->nmi_pending = false; m68k->m68ki_exception_interrupt(m68k, 7); } else if(m68k->int_level > m68k->int_mask) m68k->m68ki_exception_interrupt(m68k, m68k->int_level>>8);*/ if (m68k->c.current_cycle >= m68k->c.int_cycle) { m68ki_exception_interrupt(m68k, m68k->c.int_num); } } /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ #endif /* __M68KCPU_H__ */