/* ======================================================================== */ /* ========================= LICENSING & COPYRIGHT ======================== */ /* ======================================================================== */ /* * MUSASHI * Version 4.50 * * 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 */ #pragma once #ifndef __M68KCPU_H__ #define __M68KCPU_H__ typedef struct _m68ki_cpu_core m68ki_cpu_core; #include "m68000.h" #include "../../../lib/softfloat/milieu.h" #include "../../../lib/softfloat/softfloat.h" #include #include /* ======================================================================== */ /* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */ /* ======================================================================== */ /* Check for > 32bit sizes */ #define MAKE_INT_8(A) (INT8)(A) #define MAKE_INT_16(A) (INT16)(A) #define MAKE_INT_32(A) (INT32)(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) /* 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 /* MMU constants */ #define MMU_ATC_ENTRIES (22) // 68851 has 64, 030 has 22 /* ======================================================================== */ /* ================================ 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) & U64(0x100000000)) /* 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) & U64(0xffffffff)) #define MASK_OUT_BELOW_32(A) ((A) & ~U64(0xffffffff)) /* 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 m68k->dar /* easy access to data and address regs */ #define REG_D m68k->dar #define REG_A (m68k->dar+8) #define REG_PPC m68k->ppc #define REG_PC m68k->pc #define REG_SP_BASE m68k->sp #define REG_USP m68k->sp[0] #define REG_ISP m68k->sp[4] #define REG_MSP m68k->sp[6] #define REG_SP m68k->dar[15] #define REG_FP m68k->fpr #define REG_FPCR m68k->fpcr #define REG_FPSR m68k->fpsr #define REG_FPIAR m68k->fpiar /* ----------------------------- 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_040_PLUS(A) ((A) & (CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_040_LESS(A) 1 #define CPU_TYPE_IS_030_PLUS(A) ((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) ((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_020_LESS(A) 1 #define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020)) #define CPU_TYPE_IS_EC020_PLUS(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010 | CPU_TYPE_EC020)) #define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010) #define CPU_TYPE_IS_010_PLUS(A) ((A) & (CPU_TYPE_010 | CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_EC030 | CPU_TYPE_030 | CPU_TYPE_040 | CPU_TYPE_EC040)) #define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010)) #define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000 || (A) == CPU_TYPE_008) /* Configuration switches (see m68kconf.h for explanation) */ #define M68K_EMULATE_TRACE 0 /* Enable or disable trace emulation */ #if M68K_EMULATE_TRACE /* Initiates trace checking before each instruction (t1) */ #define m68ki_trace_t1() m68ki_tracing = m68k->t1_flag /* adds t0 to trace checking if we encounter change of flow */ #define m68ki_trace_t0() m68ki_tracing |= m68k->t0_flag /* 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(m68k) #else #define m68ki_trace_t1() #define m68ki_trace_t0() #define m68ki_clear_trace() #define m68ki_exception_if_trace() #endif /* M68K_EMULATE_TRACE */ /* Address error */ /* sigjmp() on Mac OS X and *BSD in general saves signal contexts and is super-slow, use sigsetjmp() to tell it not to */ #ifdef _BSD_SETJMP_H #define m68ki_set_address_error_trap(m68k) \ if(sigsetjmp(m68k->aerr_trap, 0) != 0) \ { \ m68ki_exception_address_error(m68k); \ if(m68k->stopped) \ { \ if (m68k->remaining_cycles > 0) \ m68k->remaining_cycles = 0; \ return; \ } \ } #define m68ki_check_address_error(m68k, ADDR, WRITE_MODE, FC) \ if((ADDR)&1) \ { \ m68k->aerr_address = ADDR; \ m68k->aerr_write_mode = WRITE_MODE; \ m68k->aerr_fc = FC; \ siglongjmp(m68k->aerr_trap, 1); \ } #else #define m68ki_set_address_error_trap(m68k) \ if(setjmp(m68k->aerr_trap) != 0) \ { \ m68ki_exception_address_error(m68k); \ if(m68k->stopped) \ { \ if (m68k->remaining_cycles > 0) \ m68k->remaining_cycles = 0; \ return; \ } \ } #define m68ki_check_address_error(m68k, ADDR, WRITE_MODE, FC) \ if((ADDR)&1) \ { \ m68k->aerr_address = ADDR; \ m68k->aerr_write_mode = WRITE_MODE; \ m68k->aerr_fc = FC; \ longjmp(m68k->aerr_trap, 1); \ } #endif /* -------------------------- 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[(m68k->ir >> 9) & 7]) #define DY (REG_D[m68k->ir & 7]) /* Address Register Isolation */ #define AX (REG_A[(m68k->ir >> 9) & 7]) #define AY (REG_A[m68k->ir & 7]) /* Effective Address Calculations */ #define EA_AY_AI_8(m68k) AY /* address register indirect */ #define EA_AY_AI_16(m68k) EA_AY_AI_8(m68k) #define EA_AY_AI_32(m68k) EA_AY_AI_8(m68k) #define EA_AY_PI_8(m68k) (AY++) /* postincrement (size = byte) */ #define EA_AY_PI_16(m68k) ((AY+=2)-2) /* postincrement (size = word) */ #define EA_AY_PI_32(m68k) ((AY+=4)-4) /* postincrement (size = long) */ #define EA_AY_PD_8(m68k) (--AY) /* predecrement (size = byte) */ #define EA_AY_PD_16(m68k) (AY-=2) /* predecrement (size = word) */ #define EA_AY_PD_32(m68k) (AY-=4) /* predecrement (size = long) */ #define EA_AY_DI_8(m68k) (AY+MAKE_INT_16(m68ki_read_imm_16(m68k))) /* displacement */ #define EA_AY_DI_16(m68k) EA_AY_DI_8(m68k) #define EA_AY_DI_32(m68k) EA_AY_DI_8(m68k) #define EA_AY_IX_8(m68k) m68ki_get_ea_ix(m68k, AY) /* indirect + index */ #define EA_AY_IX_16(m68k) EA_AY_IX_8(m68k) #define EA_AY_IX_32(m68k) EA_AY_IX_8(m68k) #define EA_AX_AI_8(m68k) AX #define EA_AX_AI_16(m68k) EA_AX_AI_8(m68k) #define EA_AX_AI_32(m68k) EA_AX_AI_8(m68k) #define EA_AX_PI_8(m68k) (AX++) #define EA_AX_PI_16(m68k) ((AX+=2)-2) #define EA_AX_PI_32(m68k) ((AX+=4)-4) #define EA_AX_PD_8(m68k) (--AX) #define EA_AX_PD_16(m68k) (AX-=2) #define EA_AX_PD_32(m68k) (AX-=4) #define EA_AX_DI_8(m68k) (AX+MAKE_INT_16(m68ki_read_imm_16(m68k))) #define EA_AX_DI_16(m68k) EA_AX_DI_8(m68k) #define EA_AX_DI_32(m68k) EA_AX_DI_8(m68k) #define EA_AX_IX_8(m68k) m68ki_get_ea_ix(m68k, AX) #define EA_AX_IX_16(m68k) EA_AX_IX_8(m68k) #define EA_AX_IX_32(m68k) EA_AX_IX_8(m68k) #define EA_A7_PI_8(m68k) ((REG_A[7]+=2)-2) #define EA_A7_PD_8(m68k) (REG_A[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 */ #define m68ki_read_8(M, A) m68ki_read_8_fc (M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_16(M, A) m68ki_read_16_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_32(M, A) m68ki_read_32_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) /* Write to the current data space */ #define m68ki_write_8(M, A, V) m68ki_write_8_fc (M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_16(M, A, V) m68ki_write_16_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_32(M, A, V) m68ki_write_32_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA, V) #define m68ki_write_32_pd(M, A, V) m68ki_write_32_pd_fc(M, A, m68k->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)) /* Map PC-relative reads */ #define m68ki_read_pcrel_8(M, A) m68k_read_pcrelative_8(M, A) #define m68ki_read_pcrel_16(M, A) m68k_read_pcrelative_16(M, A) #define m68ki_read_pcrel_32(M, A) m68k_read_pcrelative_32(M, A) /* Read from the program space */ #define m68ki_read_program_8(M, A) m68ki_read_8_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_PROGRAM) #define m68ki_read_program_16(M, A) m68ki_read_16_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_PROGRAM) #define m68ki_read_program_32(M, A) m68ki_read_32_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_PROGRAM) /* Read from the data space */ #define m68ki_read_data_8(M, A) m68ki_read_8_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_data_16(M, A) m68ki_read_16_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) #define m68ki_read_data_32(M, A) m68ki_read_32_fc(M, A, m68k->s_flag | FUNCTION_CODE_USER_DATA) /* ======================================================================== */ /* =============================== PROTOTYPES ============================= */ /* ======================================================================== */ typedef union _fp_reg fp_reg; union _fp_reg { UINT64 i; double f; }; /* Redirect memory calls */ typedef proto_delegate_1param m68k_read8_proto_delegate; typedef proto_delegate_1param m68k_readimm16_proto_delegate; typedef proto_delegate_1param m68k_read16_proto_delegate; typedef proto_delegate_1param m68k_read32_proto_delegate; typedef proto_delegate_2param m68k_write8_proto_delegate; typedef proto_delegate_2param m68k_write16_proto_delegate; typedef proto_delegate_2param m68k_write32_proto_delegate; typedef delegate_1param m68k_read8_delegate; typedef delegate_1param m68k_readimm16_delegate; typedef delegate_1param m68k_read16_delegate; typedef delegate_1param m68k_read32_delegate; typedef delegate_2param m68k_write8_delegate; typedef delegate_2param m68k_write16_delegate; typedef delegate_2param m68k_write32_delegate; class m68k_memory_interface : public bindable_object { public: void init8(address_space &space); void init16(address_space &space); void init32(address_space &space); void init32mmu(address_space &space); void init32hmmu(address_space &space); offs_t opcode_xor; // Address Calculation m68k_readimm16_delegate readimm16; // Immediate read 16 bit m68k_read8_delegate read8; m68k_read16_delegate read16; m68k_read32_delegate read32; m68k_write8_delegate write8; m68k_write16_delegate write16; m68k_write32_delegate write32; private: UINT16 m68008_read_immediate_16(offs_t address); UINT16 read_immediate_16(offs_t address); UINT16 simple_read_immediate_16(offs_t address); UINT8 read_byte_32_mmu(offs_t address); void write_byte_32_mmu(offs_t address, UINT8 data); UINT16 read_immediate_16_mmu(offs_t address); UINT16 readword_d32_mmu(offs_t address); void writeword_d32_mmu(offs_t address, UINT16 data); UINT32 readlong_d32_mmu(offs_t address); void writelong_d32_mmu(offs_t address, UINT32 data); UINT8 read_byte_32_hmmu(offs_t address); void write_byte_32_hmmu(offs_t address, UINT8 data); UINT16 read_immediate_16_hmmu(offs_t address); UINT16 readword_d32_hmmu(offs_t address); void writeword_d32_hmmu(offs_t address, UINT16 data); UINT32 readlong_d32_hmmu(offs_t address); void writelong_d32_hmmu(offs_t address, UINT32 data); address_space *m_space; direct_read_data *m_direct; m68ki_cpu_core *m_cpustate; }; struct _m68ki_cpu_core { UINT32 cpu_type; /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */ UINT32 dasm_type; /* disassembly type */ UINT32 dar[16]; /* Data and Address Registers */ UINT32 ppc; /* Previous program counter */ UINT32 pc; /* Program Counter */ UINT32 sp[7]; /* User, Interrupt, and Master Stack Pointers */ UINT32 vbr; /* Vector Base Register (m68010+) */ UINT32 sfc; /* Source Function Code Register (m68010+) */ UINT32 dfc; /* Destination Function Code Register (m68010+) */ UINT32 cacr; /* Cache Control Register (m68020, unemulated) */ UINT32 caar; /* Cache Address Register (m68020, unemulated) */ UINT32 ir; /* Instruction Register */ floatx80 fpr[8]; /* FPU Data Register (m68030/040) */ UINT32 fpiar; /* FPU Instruction Address Register (m68040) */ UINT32 fpsr; /* FPU Status Register (m68040) */ UINT32 fpcr; /* FPU Control Register (m68040) */ UINT32 t1_flag; /* Trace 1 */ UINT32 t0_flag; /* Trace 0 */ UINT32 s_flag; /* Supervisor */ UINT32 m_flag; /* Master/Interrupt state */ UINT32 x_flag; /* Extend */ UINT32 n_flag; /* Negative */ UINT32 not_z_flag; /* Zero, inverted for speedups */ UINT32 v_flag; /* Overflow */ UINT32 c_flag; /* Carry */ UINT32 int_mask; /* I0-I2 */ UINT32 int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */ UINT32 stopped; /* Stopped state */ UINT32 pref_addr; /* Last prefetch address */ UINT32 pref_data; /* Data in the prefetch queue */ UINT32 sr_mask; /* Implemented status register bits */ UINT32 instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */ UINT32 run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */ int has_pmmu; /* Indicates if a PMMU available (yes on 030, 040, no on EC030) */ int has_hmmu; /* Indicates if an Apple HMMU is available in place of the 68851 (020 only) */ int pmmu_enabled; /* Indicates if the PMMU is enabled */ int hmmu_enabled; /* Indicates if the HMMU is enabled */ int has_fpu; /* Indicates if a FPU is available (yes on 030, 040, may be on 020) */ int fpu_just_reset; /* Indicates the FPU was just reset */ /* Clocks required for instructions / exceptions */ UINT32 cyc_bcc_notake_b; UINT32 cyc_bcc_notake_w; UINT32 cyc_dbcc_f_noexp; UINT32 cyc_dbcc_f_exp; UINT32 cyc_scc_r_true; UINT32 cyc_movem_w; UINT32 cyc_movem_l; UINT32 cyc_shift; UINT32 cyc_reset; int initial_cycles; int remaining_cycles; /* Number of clocks remaining */ int reset_cycles; UINT32 tracing; #ifdef _BSD_SETJMP_H sigjmp_buf aerr_trap; #else jmp_buf aerr_trap; #endif UINT32 aerr_address; UINT32 aerr_write_mode; UINT32 aerr_fc; /* Virtual IRQ lines state */ UINT32 virq_state; UINT32 nmi_pending; const UINT8* cyc_instruction; const UINT8* cyc_exception; /* Callbacks to host */ device_irq_callback int_ack_callback; /* Interrupt Acknowledge */ m68k_bkpt_ack_func bkpt_ack_callback; /* Breakpoint Acknowledge */ m68k_reset_func reset_instr_callback; /* Called when a RESET instruction is encountered */ m68k_cmpild_func cmpild_instr_callback; /* Called when a CMPI.L #v, Dn instruction is encountered */ m68k_rte_func rte_instr_callback; /* Called when a RTE instruction is encountered */ m68k_tas_func tas_instr_callback; /* Called when a TAS instruction is encountered, allows / disallows writeback */ legacy_cpu_device *device; address_space *program; m68k_memory_interface memory; offs_t encrypted_start; offs_t encrypted_end; UINT32 iotemp; /* save state data */ UINT16 save_sr; UINT8 save_stopped; UINT8 save_halted; /* PMMU registers */ UINT32 mmu_crp_aptr, mmu_crp_limit; UINT32 mmu_srp_aptr, mmu_srp_limit; UINT32 mmu_tc; UINT16 mmu_sr; UINT32 mmu_atc_tag[MMU_ATC_ENTRIES], mmu_atc_data[MMU_ATC_ENTRIES]; UINT32 mmu_atc_rr; UINT32 mmu_tt0, mmu_tt1; UINT16 mmu_tmp_sr; /* temporary hack: status code for ptest and to handle write protection */ UINT16 mmu_tmp_fc; /* temporary hack: function code for the mmu (moves) */ UINT16 mmu_tmp_rw; /* temporary hack: read/write (1/0) for the mmu */ UINT32 mmu_tmp_buserror_address; /* temporary hack: (first) bus error address */ UINT16 mmu_tmp_buserror_occurred; /* temporary hack: flag that bus error has occurred from mmu */ }; extern const UINT8 m68ki_shift_8_table[]; extern const UINT16 m68ki_shift_16_table[]; extern const UINT32 m68ki_shift_32_table[]; extern const UINT8 m68ki_exception_cycle_table[][256]; extern const UINT8 m68ki_ea_idx_cycle_table[]; /* Read data immediately after the program counter */ INLINE UINT32 m68ki_read_imm_16(m68ki_cpu_core *m68k); INLINE UINT32 m68ki_read_imm_32(m68ki_cpu_core *m68k); /* Read data with specific function code */ INLINE UINT32 m68ki_read_8_fc (m68ki_cpu_core *m68k, UINT32 address, UINT32 fc); INLINE UINT32 m68ki_read_16_fc (m68ki_cpu_core *m68k, UINT32 address, UINT32 fc); INLINE UINT32 m68ki_read_32_fc (m68ki_cpu_core *m68k, UINT32 address, UINT32 fc); /* Write data with specific function code */ INLINE void m68ki_write_8_fc (m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value); INLINE void m68ki_write_16_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value); INLINE void m68ki_write_32_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value); INLINE void m68ki_write_32_pd_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value); /* Indexed and PC-relative ea fetching */ INLINE UINT32 m68ki_get_ea_pcdi(m68ki_cpu_core *m68k); INLINE UINT32 m68ki_get_ea_pcix(m68ki_cpu_core *m68k); INLINE UINT32 m68ki_get_ea_ix(m68ki_cpu_core *m68k, UINT32 An); /* Operand fetching */ INLINE UINT32 OPER_AY_AI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_AI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_AI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PD_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PD_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_PD_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_DI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_DI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_DI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_IX_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_IX_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AY_IX_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_AI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_AI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_AI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PD_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PD_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_PD_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_DI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_DI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_DI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_IX_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_IX_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AX_IX_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_A7_PI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_A7_PD_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AW_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AW_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AW_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AL_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AL_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_AL_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCDI_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCDI_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCDI_32(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCIX_8(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCIX_16(m68ki_cpu_core *m68k); INLINE UINT32 OPER_PCIX_32(m68ki_cpu_core *m68k); /* Stack operations */ INLINE void m68ki_push_16(m68ki_cpu_core *m68k, UINT32 value); INLINE void m68ki_push_32(m68ki_cpu_core *m68k, UINT32 value); INLINE UINT32 m68ki_pull_16(m68ki_cpu_core *m68k); INLINE UINT32 m68ki_pull_32(m68ki_cpu_core *m68k); /* Program flow operations */ INLINE void m68ki_jump(m68ki_cpu_core *m68k, UINT32 new_pc); INLINE void m68ki_jump_vector(m68ki_cpu_core *m68k, UINT32 vector); INLINE void m68ki_branch_8(m68ki_cpu_core *m68k, UINT32 offset); INLINE void m68ki_branch_16(m68ki_cpu_core *m68k, UINT32 offset); INLINE void m68ki_branch_32(m68ki_cpu_core *m68k, UINT32 offset); /* Status register operations. */ INLINE void m68ki_set_s_flag(m68ki_cpu_core *m68k, UINT32 value); /* Only bit 2 of value should be set (i.e. 4 or 0) */ INLINE void m68ki_set_sm_flag(m68ki_cpu_core *m68k, UINT32 value); /* only bits 1 and 2 of value should be set */ INLINE void m68ki_set_ccr(m68ki_cpu_core *m68k, UINT32 value); /* set the condition code register */ INLINE void m68ki_set_sr(m68ki_cpu_core *m68k, UINT32 value); /* set the status register */ INLINE void m68ki_set_sr_noint(m68ki_cpu_core *m68k, UINT32 value); /* set the status register */ /* Exception processing */ INLINE UINT32 m68ki_init_exception(m68ki_cpu_core *m68k); /* Initial exception processing */ INLINE void m68ki_stack_frame_3word(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr); /* Stack various frame types */ INLINE void m68ki_stack_frame_buserr(m68ki_cpu_core *m68k, UINT32 sr); INLINE void m68ki_stack_frame_0000(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 vector); INLINE void m68ki_stack_frame_0001(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 vector); INLINE void m68ki_stack_frame_0010(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector); INLINE void m68ki_stack_frame_1000(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 vector); INLINE void m68ki_stack_frame_1010(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector, UINT32 pc, UINT32 fault_address); INLINE void m68ki_stack_frame_1011(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector, UINT32 pc, UINT32 fault_address); INLINE void m68ki_exception_trap(m68ki_cpu_core *m68k, UINT32 vector); INLINE void m68ki_exception_trapN(m68ki_cpu_core *m68k, UINT32 vector); INLINE void m68ki_exception_trace(m68ki_cpu_core *m68k); INLINE void m68ki_exception_privilege_violation(m68ki_cpu_core *m68k); INLINE void m68ki_exception_1010(m68ki_cpu_core *m68k); INLINE void m68ki_exception_1111(m68ki_cpu_core *m68k); INLINE void m68ki_exception_illegal(m68ki_cpu_core *m68k); INLINE void m68ki_exception_format_error(m68ki_cpu_core *m68k); INLINE void m68ki_exception_address_error(m68ki_cpu_core *m68k); INLINE void m68ki_exception_interrupt(m68ki_cpu_core *m68k, UINT32 int_level); INLINE void m68ki_check_interrupts(m68ki_cpu_core *m68k); /* ASG: check for interrupts */ /* quick disassembly (used for logging) */ char* m68ki_disassemble_quick(unsigned int pc, unsigned int cpu_type); /* ======================================================================== */ /* =========================== UTILITY FUNCTIONS ========================== */ /* ======================================================================== */ INLINE unsigned int m68k_read_immediate_32(m68ki_cpu_core *m68k, unsigned int address) { return (m68k->memory.readimm16(address) << 16) | m68k->memory.readimm16(address + 2); } INLINE unsigned int m68k_read_pcrelative_8(m68ki_cpu_core *m68k, unsigned int address) { if (address >= m68k->encrypted_start && address < m68k->encrypted_end) return ((m68k->memory.readimm16(address&~1)>>(8*(1-(address & 1))))&0xff); return m68k->memory.read8(address); } INLINE unsigned int m68k_read_pcrelative_16(m68ki_cpu_core *m68k, unsigned int address) { if (address >= m68k->encrypted_start && address < m68k->encrypted_end) return m68k->memory.readimm16(address); return m68k->memory.read16(address); } INLINE unsigned int m68k_read_pcrelative_32(m68ki_cpu_core *m68k, unsigned int address) { if (address >= m68k->encrypted_start && address < m68k->encrypted_end) return m68k_read_immediate_32(m68k, address); return m68k->memory.read32(address); } /* 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]. */ INLINE void m68kx_write_memory_32_pd(m68ki_cpu_core *m68k, unsigned int address, unsigned int value) { m68k->memory.write16(address+2, value>>16); m68k->memory.write16(address, value&0xffff); } /* ---------------------------- Read Immediate ---------------------------- */ /* Handles all immediate reads, does address error check, function code setting, * and prefetching if they are enabled in m68kconf.h */ INLINE UINT32 m68ki_read_imm_16(m68ki_cpu_core *m68k) { UINT32 result; m68k->mmu_tmp_fc = m68k->s_flag | FUNCTION_CODE_USER_PROGRAM; m68k->mmu_tmp_rw = 1; m68ki_check_address_error(m68k, REG_PC, MODE_READ, m68k->s_flag | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */ if(REG_PC != m68k->pref_addr) { m68k->pref_data = m68k->memory.readimm16(REG_PC); m68k->pref_addr = m68k->mmu_tmp_buserror_occurred ? ~0 : REG_PC; } result = MASK_OUT_ABOVE_16(m68k->pref_data); REG_PC += 2; if (!m68k->mmu_tmp_buserror_occurred) { // prefetch only if no bus error occurred in opcode fetch m68k->pref_data = m68k->memory.readimm16(REG_PC); m68k->pref_addr = m68k->mmu_tmp_buserror_occurred ? ~0 : REG_PC; // ignore bus error on prefetch m68k->mmu_tmp_buserror_occurred = 0; } return result; } INLINE UINT32 m68ki_read_imm_32(m68ki_cpu_core *m68k) { UINT32 temp_val; m68k->mmu_tmp_fc = m68k->s_flag | FUNCTION_CODE_USER_PROGRAM; m68k->mmu_tmp_rw = 1; m68ki_check_address_error(m68k, REG_PC, MODE_READ, m68k->s_flag | FUNCTION_CODE_USER_PROGRAM); /* auto-disable (see m68kcpu.h) */ if(REG_PC != m68k->pref_addr) { m68k->pref_addr = REG_PC; m68k->pref_data = m68k->memory.readimm16(m68k->pref_addr); } temp_val = MASK_OUT_ABOVE_16(m68k->pref_data); REG_PC += 2; m68k->pref_addr = REG_PC; m68k->pref_data = m68k->memory.readimm16(m68k->pref_addr); temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | MASK_OUT_ABOVE_16(m68k->pref_data)); REG_PC += 2; m68k->pref_data = m68k->memory.readimm16(REG_PC); m68k->pref_addr = m68k->mmu_tmp_buserror_occurred ? ~0 : REG_PC; return temp_val; } /* ------------------------- 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 UINT32 m68ki_read_8_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc) { m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 1; return m68k->memory.read8(address); } INLINE UINT32 m68ki_read_16_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc) { if (CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { m68ki_check_address_error(m68k, address, MODE_READ, fc); } m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 1; return m68k->memory.read16(address); } INLINE UINT32 m68ki_read_32_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc) { if (CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { m68ki_check_address_error(m68k, address, MODE_READ, fc); } m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 1; return m68k->memory.read32(address); } INLINE void m68ki_write_8_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value) { m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 0; m68k->memory.write8(address, value); } INLINE void m68ki_write_16_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value) { if (CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { m68ki_check_address_error(m68k, address, MODE_WRITE, fc); } m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 0; m68k->memory.write16(address, value); } INLINE void m68ki_write_32_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value) { if (CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { m68ki_check_address_error(m68k, address, MODE_WRITE, fc); } m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 0; m68k->memory.write32(address, value); } /* 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]. */ INLINE void m68ki_write_32_pd_fc(m68ki_cpu_core *m68k, UINT32 address, UINT32 fc, UINT32 value) { if (CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { m68ki_check_address_error(m68k, address, MODE_WRITE, fc); } m68k->mmu_tmp_fc = fc; m68k->mmu_tmp_rw = 0; m68k->memory.write16(address+2, value>>16); m68k->memory.write16(address, value&0xffff); } /* --------------------- Effective Address Calculation -------------------- */ /* The program counter relative addressing modes cause operands to be * retrieved from program space, not data space. */ INLINE UINT32 m68ki_get_ea_pcdi(m68ki_cpu_core *m68k) { UINT32 old_pc = REG_PC; return old_pc + MAKE_INT_16(m68ki_read_imm_16(m68k)); } INLINE UINT32 m68ki_get_ea_pcix(m68ki_cpu_core *m68k) { return m68ki_get_ea_ix(m68k, 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 UINT32 m68ki_get_ea_ix(m68ki_cpu_core *m68k, UINT32 An) { /* An = base register */ UINT32 extension = m68ki_read_imm_16(m68k); UINT32 Xn = 0; /* Index register */ UINT32 bd = 0; /* Base Displacement */ UINT32 od = 0; /* Outer Displacement */ if(CPU_TYPE_IS_010_LESS(m68k->cpu_type)) { /* 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); } /* Brief extension format */ if(!BIT_8(extension)) { /* Calculate index */ Xn = REG_DA[extension>>12]; /* Xn */ if(!BIT_B(extension)) /* W/L */ Xn = MAKE_INT_16(Xn); /* Add scale if proper CPU type */ if(CPU_TYPE_IS_EC020_PLUS(m68k->cpu_type)) Xn <<= (extension>>9) & 3; /* SCALE */ /* Add base register and displacement and return */ return An + Xn + MAKE_INT_8(extension); } /* Full extension format */ m68k->remaining_cycles -= m68ki_ea_idx_cycle_table[extension&0x3f]; /* Check if base register is present */ if(BIT_7(extension)) /* BS */ An = 0; /* An */ /* Check if index is present */ if(!BIT_6(extension)) /* IS */ { Xn = REG_DA[extension>>12]; /* Xn */ if(!BIT_B(extension)) /* W/L */ Xn = MAKE_INT_16(Xn); Xn <<= (extension>>9) & 3; /* SCALE */ } /* Check if base displacement is present */ if(BIT_5(extension)) /* BD SIZE */ bd = BIT_4(extension) ? m68ki_read_imm_32(m68k) : MAKE_INT_16(m68ki_read_imm_16(m68k)); /* If no indirect action, we are done */ if(!(extension&7)) /* No Memory Indirect */ return An + bd + Xn; /* Check if outer displacement is present */ if(BIT_1(extension)) /* I/IS: od */ od = BIT_0(extension) ? m68ki_read_imm_32(m68k) : MAKE_INT_16(m68ki_read_imm_16(m68k)); /* Postindex */ if(BIT_2(extension)) /* I/IS: 0 = preindex, 1 = postindex */ return m68ki_read_32(m68k, An + bd) + Xn + od; /* Preindex */ return m68ki_read_32(m68k, An + bd + Xn) + od; } /* Fetch operands */ INLINE UINT32 OPER_AY_AI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_AI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AY_AI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_AI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AY_AI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_AI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AY_PI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AY_PI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AY_PI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AY_PD_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PD_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AY_PD_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PD_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AY_PD_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_PD_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AY_DI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_DI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AY_DI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_DI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AY_DI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_DI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AY_IX_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_IX_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AY_IX_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_IX_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AY_IX_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AY_IX_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AX_AI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_AI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AX_AI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_AI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AX_AI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_AI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AX_PI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AX_PI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AX_PI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AX_PD_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PD_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AX_PD_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PD_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AX_PD_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_PD_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AX_DI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_DI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AX_DI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_DI_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AX_DI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_DI_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AX_IX_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_IX_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AX_IX_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_IX_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AX_IX_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AX_IX_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_A7_PI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_A7_PI_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_A7_PD_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_A7_PD_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AW_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AW_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AW_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AW_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AW_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AW_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_AL_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_AL_8(m68k); return m68ki_read_8(m68k, ea); } INLINE UINT32 OPER_AL_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_AL_16(m68k); return m68ki_read_16(m68k, ea);} INLINE UINT32 OPER_AL_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_AL_32(m68k); return m68ki_read_32(m68k, ea);} INLINE UINT32 OPER_PCDI_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCDI_8(m68k); return m68ki_read_pcrel_8(m68k, ea); } INLINE UINT32 OPER_PCDI_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCDI_16(m68k); return m68ki_read_pcrel_16(m68k, ea);} INLINE UINT32 OPER_PCDI_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCDI_32(m68k); return m68ki_read_pcrel_32(m68k, ea);} INLINE UINT32 OPER_PCIX_8(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCIX_8(m68k); return m68ki_read_pcrel_8(m68k, ea); } INLINE UINT32 OPER_PCIX_16(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCIX_16(m68k); return m68ki_read_pcrel_16(m68k, ea);} INLINE UINT32 OPER_PCIX_32(m68ki_cpu_core *m68k) {UINT32 ea = EA_PCIX_32(m68k); return m68ki_read_pcrel_32(m68k, ea);} /* ---------------------------- Stack Functions --------------------------- */ /* Push/pull data from the stack */ INLINE void m68ki_push_16(m68ki_cpu_core *m68k, UINT32 value) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2); m68ki_write_16(m68k, REG_SP, value); } INLINE void m68ki_push_32(m68ki_cpu_core *m68k, UINT32 value) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4); m68ki_write_32(m68k, REG_SP, value); } INLINE UINT32 m68ki_pull_16(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2); return m68ki_read_16(m68k, REG_SP-2); } INLINE UINT32 m68ki_pull_32(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4); return m68ki_read_32(m68k, REG_SP-4); } /* Increment/decrement the stack as if doing a push/pull but * don't do any memory access. */ INLINE void m68ki_fake_push_16(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2); } INLINE void m68ki_fake_push_32(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4); } INLINE void m68ki_fake_pull_16(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2); } INLINE void m68ki_fake_pull_32(m68ki_cpu_core *m68k) { REG_SP = MASK_OUT_ABOVE_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(m68ki_cpu_core *m68k, UINT32 new_pc) { REG_PC = new_pc; } INLINE void m68ki_jump_vector(m68ki_cpu_core *m68k, UINT32 vector) { REG_PC = (vector<<2) + m68k->vbr; REG_PC = m68ki_read_data_32(m68k, REG_PC); } /* 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(m68ki_cpu_core *m68k, UINT32 offset) { REG_PC += MAKE_INT_8(offset); } INLINE void m68ki_branch_16(m68ki_cpu_core *m68k, UINT32 offset) { REG_PC += MAKE_INT_16(offset); } INLINE void m68ki_branch_32(m68ki_cpu_core *m68k, UINT32 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(m68ki_cpu_core *m68k, UINT32 value) { /* Backup the old stack pointer */ REG_SP_BASE[m68k->s_flag | ((m68k->s_flag>>1) & m68k->m_flag)] = REG_SP; /* Set the S flag */ m68k->s_flag = value; /* Set the new stack pointer */ REG_SP = REG_SP_BASE[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). */ INLINE void m68ki_set_sm_flag(m68ki_cpu_core *m68k, UINT32 value) { /* Backup the old stack pointer */ REG_SP_BASE[m68k->s_flag | ((m68k->s_flag>>1) & m68k->m_flag)] = REG_SP; /* Set the S and M flags */ m68k->s_flag = value & SFLAG_SET; m68k->m_flag = value & MFLAG_SET; /* Set the new stack pointer */ REG_SP = REG_SP_BASE[m68k->s_flag | ((m68k->s_flag>>1) & m68k->m_flag)]; } /* Set the S and M flags. Don't touch the stack pointer. */ INLINE void m68ki_set_sm_flag_nosp(m68ki_cpu_core *m68k, UINT32 value) { /* Set the S and M flags */ m68k->s_flag = value & SFLAG_SET; m68k->m_flag = value & MFLAG_SET; } /* Set the condition code register */ INLINE void m68ki_set_ccr(m68ki_cpu_core *m68k, UINT32 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 */ INLINE void m68ki_set_sr_noint(m68ki_cpu_core *m68k, UINT32 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; 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 */ INLINE void m68ki_set_sr_noint_nosp(m68ki_cpu_core *m68k, UINT32 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; m68ki_set_ccr(m68k, value); m68ki_set_sm_flag_nosp(m68k, (value >> 11) & 6); } /* Set the status register and check for interrupts */ INLINE void m68ki_set_sr(m68ki_cpu_core *m68k, UINT32 value) { m68ki_set_sr_noint(m68k, value); m68ki_check_interrupts(m68k); } /* ------------------------- Exception Processing ------------------------- */ /* Initiate exception processing */ INLINE UINT32 m68ki_init_exception(m68ki_cpu_core *m68k) { /* Save the old status register */ UINT32 sr = m68ki_get_sr(m68k); /* Turn off trace flag, clear pending traces */ m68k->t1_flag = m68k->t0_flag = 0; m68ki_clear_trace(); /* Enter supervisor mode */ m68ki_set_s_flag(m68k, SFLAG_SET); return sr; } /* 3 word stack frame (68000 only) */ INLINE void m68ki_stack_frame_3word(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr) { m68ki_push_32(m68k, pc); m68ki_push_16(m68k, sr); } /* Format 0 stack frame. * This is the standard stack frame for 68010+. */ INLINE void m68ki_stack_frame_0000(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 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. */ INLINE void m68ki_stack_frame_0001(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 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. */ INLINE void m68ki_stack_frame_0010(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector) { m68ki_push_32(m68k, REG_PPC); m68ki_push_16(m68k, 0x2000 | (vector<<2)); m68ki_push_32(m68k, REG_PC); m68ki_push_16(m68k, sr); } /* Bus error stack frame (68000 only). */ INLINE void m68ki_stack_frame_buserr(m68ki_cpu_core *m68k, UINT32 sr) { m68ki_push_32(m68k, REG_PC); m68ki_push_16(m68k, sr); m68ki_push_16(m68k, m68k->ir); m68ki_push_32(m68k, 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, 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. */ void m68ki_stack_frame_1000(m68ki_cpu_core *m68k, UINT32 pc, UINT32 sr, UINT32 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. */ void m68ki_stack_frame_1010(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector, UINT32 pc, UINT32 fault_address) { /* 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 */ m68ki_push_16(m68k, 0); /* 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. */ void m68ki_stack_frame_1011(m68ki_cpu_core *m68k, UINT32 sr, UINT32 vector, UINT32 pc, UINT32 fault_address) { /* 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, fault_address); /* 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, 0); /* 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, 0); /* 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); } /* Used for Group 2 exceptions. * These stack a type 2 frame on the 020. */ INLINE void m68ki_exception_trap(m68ki_cpu_core *m68k, UINT32 vector) { UINT32 sr = m68ki_init_exception(m68k); if(CPU_TYPE_IS_010_LESS(m68k->cpu_type)) m68ki_stack_frame_0000(m68k, REG_PC, sr, vector); else m68ki_stack_frame_0010(m68k, sr, vector); m68ki_jump_vector(m68k, vector); /* Use up some clock cycles */ m68k->remaining_cycles -= m68k->cyc_exception[vector]; } /* Trap#n stacks a 0 frame but behaves like group2 otherwise */ INLINE void m68ki_exception_trapN(m68ki_cpu_core *m68k, UINT32 vector) { UINT32 sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PC, sr, vector); m68ki_jump_vector(m68k, vector); /* Use up some clock cycles */ m68k->remaining_cycles -= m68k->cyc_exception[vector]; } /* Exception for trace mode */ INLINE void m68ki_exception_trace(m68ki_cpu_core *m68k) { UINT32 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, 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->remaining_cycles -= m68k->cyc_exception[EXCEPTION_TRACE]; } /* Exception for privilege violation */ INLINE void m68ki_exception_privilege_violation(m68ki_cpu_core *m68k) { UINT32 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, sr, EXCEPTION_PRIVILEGE_VIOLATION); m68ki_jump_vector(m68k, EXCEPTION_PRIVILEGE_VIOLATION); /* Use up some clock cycles and undo the instruction's cycles */ m68k->remaining_cycles -= m68k->cyc_exception[EXCEPTION_PRIVILEGE_VIOLATION] - m68k->cyc_instruction[m68k->ir]; } /* Exception for A-Line instructions */ INLINE void m68ki_exception_1010(m68ki_cpu_core *m68k) { UINT32 sr; sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PPC, sr, EXCEPTION_1010); m68ki_jump_vector(m68k, EXCEPTION_1010); /* Use up some clock cycles and undo the instruction's cycles */ m68k->remaining_cycles -= m68k->cyc_exception[EXCEPTION_1010] - m68k->cyc_instruction[m68k->ir]; } /* Exception for F-Line instructions */ INLINE void m68ki_exception_1111(m68ki_cpu_core *m68k) { UINT32 sr; sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PPC, sr, EXCEPTION_1111); m68ki_jump_vector(m68k, EXCEPTION_1111); /* Use up some clock cycles and undo the instruction's cycles */ m68k->remaining_cycles -= m68k->cyc_exception[EXCEPTION_1111] - m68k->cyc_instruction[m68k->ir]; } /* Exception for illegal instructions */ INLINE void m68ki_exception_illegal(m68ki_cpu_core *m68k) { UINT32 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, sr, EXCEPTION_ILLEGAL_INSTRUCTION); m68ki_jump_vector(m68k, EXCEPTION_ILLEGAL_INSTRUCTION); /* Use up some clock cycles and undo the instruction's cycles */ m68k->remaining_cycles -= m68k->cyc_exception[EXCEPTION_ILLEGAL_INSTRUCTION] - m68k->cyc_instruction[m68k->ir]; } /* Exception for format errror in RTE */ INLINE void m68ki_exception_format_error(m68ki_cpu_core *m68k) { UINT32 sr = m68ki_init_exception(m68k); m68ki_stack_frame_0000(m68k, REG_PC, sr, EXCEPTION_FORMAT_ERROR); m68ki_jump_vector(m68k, EXCEPTION_FORMAT_ERROR); /* Use up some clock cycles and undo the instruction's cycles */ m68k->remaining_cycles -= m68k->cyc_exception[EXCEPTION_FORMAT_ERROR] - m68k->cyc_instruction[m68k->ir]; } /* Exception for address error */ INLINE void m68ki_exception_address_error(m68ki_cpu_core *m68k) { UINT32 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->remaining_cycles -= m68k->cyc_exception[EXCEPTION_ADDRESS_ERROR] - m68k->cyc_instruction[m68k->ir]; } /* Service an interrupt request and start exception processing */ void m68ki_exception_interrupt(m68ki_cpu_core *m68k, UINT32 int_level) { UINT32 vector; UINT32 sr; UINT32 new_pc; if(CPU_TYPE_IS_000(m68k->cpu_type)) { m68k->instr_mode = INSTRUCTION_NO; } /* Turn off the stopped state */ m68k->stopped &= ~STOP_LEVEL_STOP; /* If we are halted, don't do anything */ if(m68k->stopped) return; /* Acknowledge the interrupt */ vector = (*m68k->int_ack_callback)(m68k->device, int_level); /* Get the interrupt vector */ if(vector == M68K_INT_ACK_AUTOVECTOR) /* Use the autovectors. This is the most commonly used implementation */ vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level; else if(vector == M68K_INT_ACK_SPURIOUS) /* Called if no devices respond to the interrupt acknowledge */ vector = EXCEPTION_SPURIOUS_INTERRUPT; else if(vector > 255) return; /* Start exception processing */ sr = m68ki_init_exception(m68k); /* Set the interrupt mask to the level of the one being serviced */ m68k->int_mask = int_level<<8; /* Get the new PC */ new_pc = m68ki_read_data_32(m68k, (vector<<2) + m68k->vbr); /* If vector is uninitialized, call the uninitialized interrupt vector */ if(new_pc == 0) new_pc = m68ki_read_data_32(m68k, (EXCEPTION_UNINITIALIZED_INTERRUPT<<2) + m68k->vbr); /* Generate a stack frame */ m68ki_stack_frame_0000(m68k, REG_PC, sr, vector); if(m68k->m_flag && CPU_TYPE_IS_EC020_PLUS(m68k->cpu_type)) { /* Create throwaway frame */ m68ki_set_sm_flag(m68k, m68k->s_flag); /* clear M */ sr |= 0x2000; /* Same as SR in master stack frame except S is forced high */ m68ki_stack_frame_0001(m68k, REG_PC, sr, vector); } m68ki_jump(m68k, new_pc); /* Defer cycle counting until later */ m68k->remaining_cycles -= m68k->cyc_exception[vector]; } /* ASG: Check for interrupts */ INLINE void m68ki_check_interrupts(m68ki_cpu_core *m68k) { if(m68k->nmi_pending) { m68k->nmi_pending = FALSE; m68ki_exception_interrupt(m68k, 7); } else if(m68k->int_level > m68k->int_mask) m68ki_exception_interrupt(m68k, m68k->int_level>>8); } /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ #endif /* __M68KCPU_H__ */