diff --git a/core/m68k/m68k.h b/core/m68k/m68k.h index de394b5..078cbdf 100644 --- a/core/m68k/m68k.h +++ b/core/m68k/m68k.h @@ -1,1390 +1,391 @@ -#ifndef M68KCPU__HEADER -#define M68KCPU__HEADER +#ifndef M68K__HEADER +#define M68K__HEADER /* ======================================================================== */ -/* GENERIC 68K CORE */ +/* ========================= LICENSING & COPYRIGHT ======================== */ +/* ======================================================================== */ +/* + * MUSASHI + * Version 3.32 + * + * A portable Motorola M680x0 processor emulation engine. + * Copyright Karl Stenerud. All rights reserved. + * + * This code may be freely used for non-commercial purposes as long as this + * copyright notice remains unaltered in the source code and any binary files + * containing this code in compiled form. + * + * All other licensing terms must be negotiated with the author + * (Karl Stenerud). + * + * The latest version of this code can be obtained at: + * http://kstenerud.cjb.net + */ + + /* Modified by Eke-Eke for Genesis Plus GX: + + - removed unused stuff to reduce memory usage / optimize execution (multiple CPU types support, NMI support, ...) + - moved stuff to compile statically in a single object file + - implemented support for global cycle count (shared by 68k & Z80 CPU) + - added support for interrupt latency (Sesame's Street Counting Cafe, Fatal Rewind) + - added proper cycle use on reset + - added cycle accurate timings for MUL/DIV instructions (thanks to Jorge Cwik !) + - fixed undocumented flags for DIV instructions (Blood Shot) + - fixed undocumented behaviors for ABCD/SBCD/NBCD instructions (thanks to flamewing for his test ROM) + - improved auto-vectored interrupts acknowledge cycle timing accuracy + - added MAIN-CPU & SUB-CPU support for Mega CD emulation + + */ + +/* ======================================================================== */ +/* ================================ INCLUDES ============================== */ /* ======================================================================== */ -#include -#include -#include - -#if M68K_EMULATE_ADDRESS_ERROR #include -#endif /* M68K_EMULATE_ADDRESS_ERROR */ +#include "macros.h" + +/* ======================================================================== */ +/* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */ +/* ======================================================================== */ + +/* Check for > 32bit sizes */ +#if UINT_MAX > 0xffffffff + #define M68K_INT_GT_32_BIT 1 +#else + #define M68K_INT_GT_32_BIT 0 +#endif + +/* Data types used in this emulation core */ +#undef sint8 +#undef sint16 +#undef sint32 +#undef sint64 +#undef uint8 +#undef uint16 +#undef uint32 +#undef uint64 +#undef sint +#undef uint + +#define sint8 signed char /* ASG: changed from char to signed char */ +#define sint16 signed short +#define sint32 signed int /* AWJ: changed from long to int */ +#define uint8 unsigned char +#define uint16 unsigned short +#define uint32 unsigned int /* AWJ: changed from long to int */ + +/* signed and unsigned int must be at least 32 bits wide */ +#define sint signed int +#define uint unsigned int + + +#if M68K_USE_64_BIT +#define sint64 signed long long +#define uint64 unsigned long long +#else +#define sint64 sint32 +#define uint64 uint32 +#endif /* M68K_USE_64_BIT */ + + + +/* Allow for architectures that don't have 8-bit sizes */ +/*#if UCHAR_MAX == 0xff*/ + #define MAKE_INT_8(A) (sint8)(A) +/*#else + #undef sint8 + #define sint8 signed int + #undef uint8 + #define uint8 unsigned int + INLINE sint MAKE_INT_8(uint value) + { + return (value & 0x80) ? value | ~0xff : value & 0xff; + }*/ +/*#endif *//* UCHAR_MAX == 0xff */ + + +/* Allow for architectures that don't have 16-bit sizes */ +/*#if USHRT_MAX == 0xffff*/ + #define MAKE_INT_16(A) (sint16)(A) +/*#else + #undef sint16 + #define sint16 signed int + #undef uint16 + #define uint16 unsigned int + INLINE sint MAKE_INT_16(uint value) + { + return (value & 0x8000) ? value | ~0xffff : value & 0xffff; + }*/ +/*#endif *//* USHRT_MAX == 0xffff */ + + +/* Allow for architectures that don't have 32-bit sizes */ +/*#if UINT_MAX == 0xffffffff*/ + #define MAKE_INT_32(A) (sint32)(A) +/*#else + #undef sint32 + #define sint32 signed int + #undef uint32 + #define uint32 unsigned int + INLINE sint MAKE_INT_32(uint value) + { + return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff; + }*/ +/*#endif *//* UINT_MAX == 0xffffffff */ -#include "m68k.h" /* ======================================================================== */ /* ============================ GENERAL DEFINES =========================== */ -/* ======================================================================== */ - -/* Exception Vectors handled by emulation */ -#define EXCEPTION_RESET 0 -#define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */ -#define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */ -#define EXCEPTION_ILLEGAL_INSTRUCTION 4 -#define EXCEPTION_ZERO_DIVIDE 5 -#define EXCEPTION_CHK 6 -#define EXCEPTION_TRAPV 7 -#define EXCEPTION_PRIVILEGE_VIOLATION 8 -#define EXCEPTION_TRACE 9 -#define EXCEPTION_1010 10 -#define EXCEPTION_1111 11 -#define EXCEPTION_FORMAT_ERROR 14 -#define EXCEPTION_UNINITIALIZED_INTERRUPT 15 -#define EXCEPTION_SPURIOUS_INTERRUPT 24 -#define EXCEPTION_INTERRUPT_AUTOVECTOR 24 -#define EXCEPTION_TRAP_BASE 32 - -/* Function codes set by CPU during data/address bus activity */ -#define FUNCTION_CODE_USER_DATA 1 -#define FUNCTION_CODE_USER_PROGRAM 2 -#define FUNCTION_CODE_SUPERVISOR_DATA 5 -#define FUNCTION_CODE_SUPERVISOR_PROGRAM 6 -#define FUNCTION_CODE_CPU_SPACE 7 - -/* Different ways to stop the CPU */ -#define STOP_LEVEL_STOP 1 -#define STOP_LEVEL_HALT 2 - -/* Used for 68000 address error processing */ -#if M68K_EMULATE_ADDRESS_ERROR -#define INSTRUCTION_YES 0 -#define INSTRUCTION_NO 0x08 -#define MODE_READ 0x10 -#define MODE_WRITE 0 - -#define RUN_MODE_NORMAL 0 -#define RUN_MODE_BERR_AERR_RESET 1 -#endif - -#ifndef NULL -#define NULL ((void*)0) -#endif /* ======================================================================== */ -/* ================================ MACROS ================================ */ -/* ======================================================================== */ + +/* There are 7 levels of interrupt to the 68K. + * A transition from < 7 to 7 will cause a non-maskable interrupt (NMI). + */ +#define M68K_IRQ_NONE 0 +#define M68K_IRQ_1 1 +#define M68K_IRQ_2 2 +#define M68K_IRQ_3 3 +#define M68K_IRQ_4 4 +#define M68K_IRQ_5 5 +#define M68K_IRQ_6 6 +#define M68K_IRQ_7 7 -/* ---------------------------- General Macros ---------------------------- */ +/* Special interrupt acknowledge values. + * Use these as special returns from the interrupt acknowledge callback + * (specified later in this header). + */ -/* 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) +/* 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 -/* Get the most significant bit for specific sizes */ -#define GET_MSB_8(A) ((A) & 0x80) -#define GET_MSB_9(A) ((A) & 0x100) -#define GET_MSB_16(A) ((A) & 0x8000) -#define GET_MSB_17(A) ((A) & 0x10000) -#define GET_MSB_32(A) ((A) & 0x80000000) -#if M68K_USE_64_BIT -#define GET_MSB_33(A) ((A) & 0x100000000) -#endif /* M68K_USE_64_BIT */ - -/* Isolate nibbles */ -#define LOW_NIBBLE(A) ((A) & 0x0f) -#define HIGH_NIBBLE(A) ((A) & 0xf0) - -/* These are used to isolate 8, 16, and 32 bit sizes */ -#define MASK_OUT_ABOVE_2(A) ((A) & 3) -#define MASK_OUT_ABOVE_8(A) ((A) & 0xff) -#define MASK_OUT_ABOVE_16(A) ((A) & 0xffff) -#define MASK_OUT_BELOW_2(A) ((A) & ~3) -#define MASK_OUT_BELOW_8(A) ((A) & ~0xff) -#define MASK_OUT_BELOW_16(A) ((A) & ~0xffff) - -/* No need to mask if we are 32 bit */ -#if M68K_INT_GT_32_BIT || M68K_USE_64_BIT - #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff) - #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff) -#else - #define MASK_OUT_ABOVE_32(A) (A) - #define MASK_OUT_BELOW_32(A) 0 -#endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */ - -/* Simulate address lines of 68k family */ -#define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK) +/* 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 -/* Shift & Rotate Macros. */ -#define LSL(A, C) ((A) << (C)) -#define LSR(A, C) ((A) >> (C)) +/* Registers used by m68k_get_reg() and m68k_set_reg() */ +typedef enum +{ + /* Real registers */ + M68K_REG_D0, /* Data registers */ + M68K_REG_D1, + M68K_REG_D2, + M68K_REG_D3, + M68K_REG_D4, + M68K_REG_D5, + M68K_REG_D6, + M68K_REG_D7, + M68K_REG_A0, /* Address registers */ + M68K_REG_A1, + M68K_REG_A2, + M68K_REG_A3, + M68K_REG_A4, + M68K_REG_A5, + M68K_REG_A6, + M68K_REG_A7, + M68K_REG_PC, /* Program Counter */ + M68K_REG_SR, /* Status Register */ + M68K_REG_SP, /* The current Stack Pointer (located in A7) */ + M68K_REG_USP, /* User Stack Pointer */ + M68K_REG_ISP, /* Interrupt Stack Pointer */ -/* Some > 32-bit optimizations */ -#if M68K_INT_GT_32_BIT - /* Shift left and right */ - #define LSR_32(A, C) ((A) >> (C)) - #define LSL_32(A, C) ((A) << (C)) -#else - /* We have to do this because the morons at ANSI decided that shifts - * by >= data size are undefined. - */ - #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0) - #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0) -#endif /* M68K_INT_GT_32_BIT */ - -#if M68K_USE_64_BIT - #define LSL_32_64(A, C) ((A) << (C)) - #define LSR_32_64(A, C) ((A) >> (C)) - #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C))) - #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C))) -#endif /* M68K_USE_64_BIT */ - -#define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C))) -#define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C))) -#define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C))) -#define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C))) -#define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C))) -#define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C))) - -#define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C))) -#define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C))) -#define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C))) -#define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C))) -#define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C))) -#define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C))) - - - -/* ------------------------------ CPU Access ------------------------------ */ - -/* Access the CPU registers */ -#define REG_DA m68ki_cpu.dar /* easy access to data and address regs */ -#define REG_D m68ki_cpu.dar -#define REG_A (m68ki_cpu.dar+8) -#define REG_PC m68ki_cpu.pc -#define REG_SP_BASE m68ki_cpu.sp -#define REG_USP m68ki_cpu.sp[0] -#define REG_ISP m68ki_cpu.sp[4] -#define REG_SP m68ki_cpu.dar[15] -#define REG_IR m68ki_cpu.ir - -#define FLAG_T1 m68ki_cpu.t1_flag -#define FLAG_S m68ki_cpu.s_flag -#define FLAG_X m68ki_cpu.x_flag -#define FLAG_N m68ki_cpu.n_flag -#define FLAG_Z m68ki_cpu.not_z_flag -#define FLAG_V m68ki_cpu.v_flag -#define FLAG_C m68ki_cpu.c_flag -#define FLAG_INT_MASK m68ki_cpu.int_mask - -#define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */ -#define CPU_STOPPED m68ki_cpu.stopped #if M68K_EMULATE_PREFETCH -#define CPU_PREF_ADDR m68ki_cpu.pref_addr -#define CPU_PREF_DATA m68ki_cpu.pref_data -#endif -#define CPU_ADDRESS_MASK 0x00ffffff -#if M68K_EMULATE_ADDRESS_ERROR -#define CPU_INSTR_MODE m68ki_cpu.instr_mode -#define CPU_RUN_MODE m68ki_cpu.run_mode + /* Assumed registers */ + /* These are cheat registers which emulate the 1-longword prefetch + * present in the 68000 and 68010. + */ + M68K_REG_PREF_ADDR, /* Last prefetch address */ + M68K_REG_PREF_DATA, /* Last prefetch data */ #endif -#define CYC_INSTRUCTION m68ki_cycles -#define CYC_EXCEPTION m68ki_exception_cycle_table -#define CYC_BCC_NOTAKE_B ( -2 * MUL) -#define CYC_BCC_NOTAKE_W ( 2 * MUL) -#define CYC_DBCC_F_NOEXP ( -2 * MUL) -#define CYC_DBCC_F_EXP ( 2 * MUL) -#define CYC_SCC_R_TRUE ( 2 * MUL) -#define CYC_MOVEM_W ( 4 * MUL) -#define CYC_MOVEM_L ( 8 * MUL) -#define CYC_SHIFT ( 2 * MUL) -#define CYC_RESET (132 * MUL) + /* Convenience registers */ + M68K_REG_IR /* Instruction register */ +} m68k_register_t; + + +/* 68k memory map structure */ +typedef struct +{ + unsigned char *base; /* memory-based access (ROM, RAM) */ + unsigned int (*read8)(unsigned int address); /* I/O byte read access */ + unsigned int (*read16)(unsigned int address); /* I/O word read access */ + void (*write8)(unsigned int address, unsigned int data); /* I/O byte write access */ + void (*write16)(unsigned int address, unsigned int data); /* I/O word write access */ +} cpu_memory_map; + +/* 68k idle loop detection */ +typedef struct +{ + uint pc; + uint cycle; + uint detected; +} cpu_idle_t; + +typedef struct +{ + cpu_memory_map memory_map[256]; /* memory mapping */ + + cpu_idle_t poll; /* polling detection */ + + uint cycles; /* current master cycle count */ + uint cycle_end; /* aimed master cycle count for current execution frame */ + + uint dar[16]; /* Data and Address Registers */ + uint pc; /* Program Counter */ + uint sp[5]; /* User and Interrupt Stack Pointers */ + uint ir; /* Instruction Register */ + uint t1_flag; /* Trace 1 */ + uint s_flag; /* Supervisor */ + uint x_flag; /* Extend */ + uint n_flag; /* Negative */ + uint not_z_flag; /* Zero, inverted for speedups */ + uint v_flag; /* Overflow */ + uint c_flag; /* Carry */ + uint int_mask; /* I0-I2 */ + uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */ + uint stopped; /* Stopped state */ + + uint pref_addr; /* Last prefetch address */ + uint pref_data; /* Data in the prefetch queue */ + + uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */ + uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */ + uint aerr_enabled; /* Enables/deisables address error checks at runtime */ + jmp_buf aerr_trap; /* Address error jump */ + uint aerr_address; /* Address error location */ + uint aerr_write_mode; /* Address error write mode */ + uint aerr_fc; /* Address error FC code */ + + uint tracing; /* Tracing enable flag */ + + uint address_space; /* Current FC code */ + + /* Callbacks to host */ + int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */ + void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */ + int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */ + void (*set_fc_callback)(unsigned int new_fc); /* Called when the CPU function code changes */ +} m68ki_cpu_core; + +/* CPU cores */ +extern m68ki_cpu_core m68k; +extern m68ki_cpu_core s68k; + + +/* ======================================================================== */ +/* ============================== CALLBACKS =============================== */ +/* ======================================================================== */ + +/* These functions allow you to set callbacks to the host when specific events + * occur. Note that you must enable the corresponding value in m68kconf.h + * in order for these to do anything useful. + * Note: I have defined default callbacks which are used if you have enabled + * the corresponding #define in m68kconf.h but either haven't assigned a + * callback or have assigned a callback of NULL. + */ #if M68K_EMULATE_INT_ACK == OPT_ON -#define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback +/* Set the callback for an interrupt acknowledge. + * You must enable M68K_EMULATE_INT_ACK in m68kconf.h. + * The CPU will call the callback with the interrupt level being acknowledged. + * The host program must return either a vector from 0x02-0xff, or one of the + * special interrupt acknowledge values specified earlier in this header. + * If this is not implemented, the CPU will always assume an autovectored + * interrupt, and will automatically clear the interrupt request when it + * services the interrupt. + * Default behavior: return M68K_INT_ACK_AUTOVECTOR. + */ +void m68k_set_int_ack_callback(int (*callback)(int int_level)); #endif + #if M68K_EMULATE_RESET == OPT_ON -#define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback +/* Set the callback for the RESET instruction. + * You must enable M68K_EMULATE_RESET in m68kconf.h. + * The CPU calls this callback every time it encounters a RESET instruction. + * Default behavior: do nothing. + */ +void m68k_set_reset_instr_callback(void (*callback)(void)); #endif + #if M68K_TAS_HAS_CALLBACK == OPT_ON -#define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback +/* Set the callback for the TAS instruction. + * You must enable M68K_TAS_HAS_CALLBACK in m68kconf.h. + * The CPU calls this callback every time it encounters a TAS instruction. + * Default behavior: return 1, allow writeback. + */ +void m68k_set_tas_instr_callback(int (*callback)(void)); #endif + #if M68K_EMULATE_FC == OPT_ON -#define CALLBACK_SET_FC m68ki_cpu.set_fc_callback -#endif - - -/* ----------------------------- Configuration ---------------------------- */ - -/* These defines are dependant on the configuration defines in m68kconf.h */ - -/* Enable or disable callback functions */ -#if M68K_EMULATE_INT_ACK - #if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER - #define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A); - #else - #define m68ki_int_ack(A) CALLBACK_INT_ACK(A); - #endif -#else - /* Default action is to used autovector mode, which is most common */ - #define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR -#endif /* M68K_EMULATE_INT_ACK */ - -#if M68K_EMULATE_RESET - #if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER - #define m68ki_output_reset() M68K_RESET_CALLBACK(); - #else - #define m68ki_output_reset() CALLBACK_RESET_INSTR(); - #endif -#else - #define m68ki_output_reset() -#endif /* M68K_EMULATE_RESET */ - -#if M68K_TAS_HAS_CALLBACK - #if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER - #define m68ki_tas_callback() M68K_TAS_CALLBACK() - #else - #define m68ki_tas_callback() CALLBACK_TAS_INSTR() - #endif -#else - #define m68ki_tas_callback() 0 -#endif /* M68K_TAS_HAS_CALLBACK */ - - -/* Enable or disable function code emulation */ -#if M68K_EMULATE_FC - #if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER - #define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A); - #else - #define m68ki_set_fc(A) CALLBACK_SET_FC(A); - #endif - #define m68ki_use_data_space() m68ki_cpu.address_space = FUNCTION_CODE_USER_DATA; - #define m68ki_use_program_space() m68ki_cpu.address_space = FUNCTION_CODE_USER_PROGRAM; - #define m68ki_get_address_space() m68ki_cpu.address_space -#else - #define m68ki_set_fc(A) - #define m68ki_use_data_space() - #define m68ki_use_program_space() - #define m68ki_get_address_space() FUNCTION_CODE_USER_DATA -#endif /* M68K_EMULATE_FC */ - - -/* Enable or disable trace emulation */ -#if M68K_EMULATE_TRACE - /* Initiates trace checking before each instruction (t1) */ - #define m68ki_trace_t1() m68ki_cpu.tracing = FLAG_T1; - /* Clear all tracing */ - #define m68ki_clear_trace() m68ki_cpu.tracing = 0; - /* Cause a trace exception if we are tracing */ - #define m68ki_exception_if_trace() if(m68ki_cpu.tracing) m68ki_exception_trace(); -#else - #define m68ki_trace_t1() - #define m68ki_clear_trace() - #define m68ki_exception_if_trace() -#endif /* M68K_EMULATE_TRACE */ - - -/* Enable or disable Address error emulation */ -#if M68K_EMULATE_ADDRESS_ERROR - #define m68ki_set_address_error_trap() \ - if(setjmp(m68ki_cpu.aerr_trap) != 0) \ - { \ - m68ki_exception_address_error(); \ - } - - #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \ - if((ADDR)&1) \ - { \ - if (m68ki_cpu.aerr_enabled) \ - { \ - m68ki_cpu.aerr_address = ADDR; \ - m68ki_cpu.aerr_write_mode = WRITE_MODE; \ - m68ki_cpu.aerr_fc = FC; \ - longjmp(m68ki_cpu.aerr_trap, 1); \ - } \ - } -#else - #define m68ki_set_address_error_trap() - #define m68ki_check_address_error(ADDR, WRITE_MODE, FC) -#endif /* M68K_ADDRESS_ERROR */ - - -/* -------------------------- EA / Operand Access ------------------------- */ - -/* - * The general instruction format follows this pattern: - * .... XXX. .... .YYY - * where XXX is register X and YYY is register Y +/* Set the callback for CPU function code changes. + * You must enable M68K_EMULATE_FC in m68kconf.h. + * The CPU calls this callback with the function code before every memory + * access to set the CPU's function code according to what kind of memory + * access it is (supervisor/user, program/data and such). + * Default behavior: do nothing. */ - -/* Data Register Isolation */ -#define DX (REG_D[(REG_IR >> 9) & 7]) -#define DY (REG_D[REG_IR & 7]) - -/* Address Register Isolation */ -#define AX (REG_A[(REG_IR >> 9) & 7]) -#define AY (REG_A[REG_IR & 7]) - -/* Effective Address Calculations */ -#define EA_AY_AI_8() AY /* address register indirect */ -#define EA_AY_AI_16() EA_AY_AI_8() -#define EA_AY_AI_32() EA_AY_AI_8() -#define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */ -#define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */ -#define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */ -#define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */ -#define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */ -#define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */ -#define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */ -#define EA_AY_DI_16() EA_AY_DI_8() -#define EA_AY_DI_32() EA_AY_DI_8() -#define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */ -#define EA_AY_IX_16() EA_AY_IX_8() -#define EA_AY_IX_32() EA_AY_IX_8() - -#define EA_AX_AI_8() AX -#define EA_AX_AI_16() EA_AX_AI_8() -#define EA_AX_AI_32() EA_AX_AI_8() -#define EA_AX_PI_8() (AX++) -#define EA_AX_PI_16() ((AX+=2)-2) -#define EA_AX_PI_32() ((AX+=4)-4) -#define EA_AX_PD_8() (--AX) -#define EA_AX_PD_16() (AX-=2) -#define EA_AX_PD_32() (AX-=4) -#define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16())) -#define EA_AX_DI_16() EA_AX_DI_8() -#define EA_AX_DI_32() EA_AX_DI_8() -#define EA_AX_IX_8() m68ki_get_ea_ix(AX) -#define EA_AX_IX_16() EA_AX_IX_8() -#define EA_AX_IX_32() EA_AX_IX_8() - -#define EA_A7_PI_8() ((REG_A[7]+=2)-2) -#define EA_A7_PD_8() (REG_A[7]-=2) - -#define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */ -#define EA_AW_16() EA_AW_8() -#define EA_AW_32() EA_AW_8() -#define EA_AL_8() m68ki_read_imm_32() /* absolute long */ -#define EA_AL_16() EA_AL_8() -#define EA_AL_32() EA_AL_8() -#define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */ -#define EA_PCDI_16() EA_PCDI_8() -#define EA_PCDI_32() EA_PCDI_8() -#define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */ -#define EA_PCIX_16() EA_PCIX_8() -#define EA_PCIX_32() EA_PCIX_8() - - -#define OPER_I_8() m68ki_read_imm_8() -#define OPER_I_16() m68ki_read_imm_16() -#define OPER_I_32() m68ki_read_imm_32() - - -/* --------------------------- Status Register ---------------------------- */ - -/* Flag Calculation Macros */ -#define CFLAG_8(A) (A) -#define CFLAG_16(A) ((A)>>8) - -#if M68K_INT_GT_32_BIT - #define CFLAG_ADD_32(S, D, R) ((R)>>24) - #define CFLAG_SUB_32(S, D, R) ((R)>>24) -#else - #define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23) - #define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23) -#endif /* M68K_INT_GT_32_BIT */ - -#define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R)) -#define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8) -#define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24) - -#define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D)) -#define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8) -#define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24) - -#define NFLAG_8(A) (A) -#define NFLAG_16(A) ((A)>>8) -#define NFLAG_32(A) ((A)>>24) -#define NFLAG_64(A) ((A)>>56) - -#define ZFLAG_8(A) MASK_OUT_ABOVE_8(A) -#define ZFLAG_16(A) MASK_OUT_ABOVE_16(A) -#define ZFLAG_32(A) MASK_OUT_ABOVE_32(A) - - -/* Flag values */ -#define NFLAG_SET 0x80 -#define NFLAG_CLEAR 0 -#define CFLAG_SET 0x100 -#define CFLAG_CLEAR 0 -#define XFLAG_SET 0x100 -#define XFLAG_CLEAR 0 -#define VFLAG_SET 0x80 -#define VFLAG_CLEAR 0 -#define ZFLAG_SET 0 -#define ZFLAG_CLEAR 0xffffffff -#define SFLAG_SET 4 -#define SFLAG_CLEAR 0 - -/* Turn flag values into 1 or 0 */ -#define XFLAG_AS_1() ((FLAG_X>>8)&1) -#define NFLAG_AS_1() ((FLAG_N>>7)&1) -#define VFLAG_AS_1() ((FLAG_V>>7)&1) -#define ZFLAG_AS_1() (!FLAG_Z) -#define CFLAG_AS_1() ((FLAG_C>>8)&1) - - -/* Conditions */ -#define COND_CS() (FLAG_C&0x100) -#define COND_CC() (!COND_CS()) -#define COND_VS() (FLAG_V&0x80) -#define COND_VC() (!COND_VS()) -#define COND_NE() FLAG_Z -#define COND_EQ() (!COND_NE()) -#define COND_MI() (FLAG_N&0x80) -#define COND_PL() (!COND_MI()) -#define COND_LT() ((FLAG_N^FLAG_V)&0x80) -#define COND_GE() (!COND_LT()) -#define COND_HI() (COND_CC() && COND_NE()) -#define COND_LS() (COND_CS() || COND_EQ()) -#define COND_GT() (COND_GE() && COND_NE()) -#define COND_LE() (COND_LT() || COND_EQ()) - -/* Reversed conditions */ -#define COND_NOT_CS() COND_CC() -#define COND_NOT_CC() COND_CS() -#define COND_NOT_VS() COND_VC() -#define COND_NOT_VC() COND_VS() -#define COND_NOT_NE() COND_EQ() -#define COND_NOT_EQ() COND_NE() -#define COND_NOT_MI() COND_PL() -#define COND_NOT_PL() COND_MI() -#define COND_NOT_LT() COND_GE() -#define COND_NOT_GE() COND_LT() -#define COND_NOT_HI() COND_LS() -#define COND_NOT_LS() COND_HI() -#define COND_NOT_GT() COND_LE() -#define COND_NOT_LE() COND_GT() - -/* Not real conditions, but here for convenience */ -#define COND_XS() (FLAG_X&0x100) -#define COND_XC() (!COND_XS) - - -/* Get the condition code register */ -#define m68ki_get_ccr() ((COND_XS() >> 4) | \ - (COND_MI() >> 4) | \ - (COND_EQ() << 2) | \ - (COND_VS() >> 6) | \ - (COND_CS() >> 8)) - -/* Get the status register */ -#define m68ki_get_sr() ( FLAG_T1 | \ - (FLAG_S << 11) | \ - FLAG_INT_MASK | \ - m68ki_get_ccr()) - - - -/* ---------------------------- Cycle Counting ---------------------------- */ - -#define USE_CYCLES(A) m68ki_cpu.cycles += (A) -#define SET_CYCLES(A) m68ki_cpu.cycles = (A) - - -/* ----------------------------- Read / Write ----------------------------- */ - -/* Read data immediately following the PC */ -#define m68k_read_immediate_16(address) *(uint16 *)(m68ki_cpu.memory_map[((address)>>16)&0xff].base + ((address) & 0xffff)) -#define m68k_read_immediate_32(address) (m68k_read_immediate_16(address) << 16) | (m68k_read_immediate_16(address+2)) - -/* Read data relative to the PC */ -#define m68k_read_pcrelative_8(address) READ_BYTE(m68ki_cpu.memory_map[((address)>>16)&0xff].base, (address) & 0xffff) -#define m68k_read_pcrelative_16(address) m68k_read_immediate_16(address) -#define m68k_read_pcrelative_32(address) m68k_read_immediate_32(address) - -/* map read immediate 8 to read immediate 16 */ -#define m68ki_read_imm_8() MASK_OUT_ABOVE_8(m68ki_read_imm_16()) - -/* Map PC-relative reads */ -#define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A) -#define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A) -#define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A) +void m68k_set_fc_callback(void (*callback)(unsigned int new_fc)); +#endif /* ======================================================================== */ -/* =============================== PROTOTYPES ============================= */ +/* ====================== FUNCTIONS TO ACCESS THE CPU ===================== */ /* ======================================================================== */ -/* Used by shift & rotate instructions */ -static const uint8 m68ki_shift_8_table[65] = -{ - 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff, 0xff, 0xff, 0xff, - 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, - 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, - 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, - 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, - 0xff, 0xff, 0xff, 0xff, 0xff -}; - -static const uint16 m68ki_shift_16_table[65] = -{ - 0x0000, 0x8000, 0xc000, 0xe000, 0xf000, 0xf800, 0xfc00, 0xfe00, 0xff00, - 0xff80, 0xffc0, 0xffe0, 0xfff0, 0xfff8, 0xfffc, 0xfffe, 0xffff, 0xffff, - 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, - 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, - 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, - 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, - 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, - 0xffff, 0xffff -}; - -static const uint m68ki_shift_32_table[65] = -{ - 0x00000000, 0x80000000, 0xc0000000, 0xe0000000, 0xf0000000, 0xf8000000, - 0xfc000000, 0xfe000000, 0xff000000, 0xff800000, 0xffc00000, 0xffe00000, - 0xfff00000, 0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000, 0xffff8000, - 0xffffc000, 0xffffe000, 0xfffff000, 0xfffff800, 0xfffffc00, 0xfffffe00, - 0xffffff00, 0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0, 0xfffffff8, - 0xfffffffc, 0xfffffffe, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, - 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, - 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, - 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, - 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, - 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff -}; - - -/* Number of clock cycles to use for exception processing. - * I used 4 for any vectors that are undocumented for processing times. +/* Do whatever initialisations the core requires. Should be called + * at least once at init time. */ -static const uint16 m68ki_exception_cycle_table[256] = -{ - 40*MUL, /* 0: Reset - Initial Stack Pointer */ - 4*MUL, /* 1: Reset - Initial Program Counter */ - 50*MUL, /* 2: Bus Error (unemulated) */ - 50*MUL, /* 3: Address Error (unemulated) */ - 34*MUL, /* 4: Illegal Instruction */ - 38*MUL, /* 5: Divide by Zero -- ASG: changed from 42 */ - 40*MUL, /* 6: CHK -- ASG: chanaged from 44 */ - 34*MUL, /* 7: TRAPV */ - 34*MUL, /* 8: Privilege Violation */ - 34*MUL, /* 9: Trace */ - 4*MUL, /* 10: 1010 */ - 4*MUL, /* 11: 1111 */ - 4*MUL, /* 12: RESERVED */ - 4*MUL, /* 13: Coprocessor Protocol Violation (unemulated) */ - 4*MUL, /* 14: Format Error */ - 44*MUL, /* 15: Uninitialized Interrupt */ - 4*MUL, /* 16: RESERVED */ - 4*MUL, /* 17: RESERVED */ - 4*MUL, /* 18: RESERVED */ - 4*MUL, /* 19: RESERVED */ - 4*MUL, /* 20: RESERVED */ - 4*MUL, /* 21: RESERVED */ - 4*MUL, /* 22: RESERVED */ - 4*MUL, /* 23: RESERVED */ - 44*MUL, /* 24: Spurious Interrupt */ - 54*MUL, /* 25: Level 1 Interrupt Autovector */ - 54*MUL, /* 26: Level 2 Interrupt Autovector */ - 54*MUL, /* 27: Level 3 Interrupt Autovector */ - 54*MUL, /* 28: Level 4 Interrupt Autovector */ - 54*MUL, /* 29: Level 5 Interrupt Autovector */ - 54*MUL, /* 30: Level 6 Interrupt Autovector */ - 54*MUL, /* 31: Level 7 Interrupt Autovector */ - 34*MUL, /* 32: TRAP #0 -- ASG: chanaged from 38 */ - 34*MUL, /* 33: TRAP #1 */ - 34*MUL, /* 34: TRAP #2 */ - 34*MUL, /* 35: TRAP #3 */ - 34*MUL, /* 36: TRAP #4 */ - 34*MUL, /* 37: TRAP #5 */ - 34*MUL, /* 38: TRAP #6 */ - 34*MUL, /* 39: TRAP #7 */ - 34*MUL, /* 40: TRAP #8 */ - 34*MUL, /* 41: TRAP #9 */ - 34*MUL, /* 42: TRAP #10 */ - 34*MUL, /* 43: TRAP #11 */ - 34*MUL, /* 44: TRAP #12 */ - 34*MUL, /* 45: TRAP #13 */ - 34*MUL, /* 46: TRAP #14 */ - 34*MUL, /* 47: TRAP #15 */ - 4*MUL, /* 48: FP Branch or Set on Unknown Condition (unemulated) */ - 4*MUL, /* 49: FP Inexact Result (unemulated) */ - 4*MUL, /* 50: FP Divide by Zero (unemulated) */ - 4*MUL, /* 51: FP Underflow (unemulated) */ - 4*MUL, /* 52: FP Operand Error (unemulated) */ - 4*MUL, /* 53: FP Overflow (unemulated) */ - 4*MUL, /* 54: FP Signaling NAN (unemulated) */ - 4*MUL, /* 55: FP Unimplemented Data Type (unemulated) */ - 4*MUL, /* 56: MMU Configuration Error (unemulated) */ - 4*MUL, /* 57: MMU Illegal Operation Error (unemulated) */ - 4*MUL, /* 58: MMU Access Level Violation Error (unemulated) */ - 4*MUL, /* 59: RESERVED */ - 4*MUL, /* 60: RESERVED */ - 4*MUL, /* 61: RESERVED */ - 4*MUL, /* 62: RESERVED */ - 4*MUL, /* 63: RESERVED */ - /* 64-255: User Defined */ - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL, - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL, - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL, - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL, - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL, - 4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL,4*MUL -}; +extern void m68k_init(void); +extern void s68k_init(void); -/* Read data immediately after the program counter */ -INLINE uint m68ki_read_imm_16(void); -INLINE uint m68ki_read_imm_32(void); - -/* Read from the current address space */ -INLINE uint m68ki_read_8(uint address); -INLINE uint m68ki_read_16(uint address); -INLINE uint m68ki_read_32(uint address); - -/* Write to the current data space */ -INLINE void m68ki_write_8(uint address, uint value); -INLINE void m68ki_write_16(uint address, uint value); -INLINE void m68ki_write_32(uint address, uint value); - -/* Indexed and PC-relative ea fetching */ -INLINE uint m68ki_get_ea_pcdi(void); -INLINE uint m68ki_get_ea_pcix(void); -INLINE uint m68ki_get_ea_ix(uint An); - -/* Operand fetching */ -INLINE uint OPER_AY_AI_8(void); -INLINE uint OPER_AY_AI_16(void); -INLINE uint OPER_AY_AI_32(void); -INLINE uint OPER_AY_PI_8(void); -INLINE uint OPER_AY_PI_16(void); -INLINE uint OPER_AY_PI_32(void); -INLINE uint OPER_AY_PD_8(void); -INLINE uint OPER_AY_PD_16(void); -INLINE uint OPER_AY_PD_32(void); -INLINE uint OPER_AY_DI_8(void); -INLINE uint OPER_AY_DI_16(void); -INLINE uint OPER_AY_DI_32(void); -INLINE uint OPER_AY_IX_8(void); -INLINE uint OPER_AY_IX_16(void); -INLINE uint OPER_AY_IX_32(void); - -INLINE uint OPER_AX_AI_8(void); -INLINE uint OPER_AX_AI_16(void); -INLINE uint OPER_AX_AI_32(void); -INLINE uint OPER_AX_PI_8(void); -INLINE uint OPER_AX_PI_16(void); -INLINE uint OPER_AX_PI_32(void); -INLINE uint OPER_AX_PD_8(void); -INLINE uint OPER_AX_PD_16(void); -INLINE uint OPER_AX_PD_32(void); -INLINE uint OPER_AX_DI_8(void); -INLINE uint OPER_AX_DI_16(void); -INLINE uint OPER_AX_DI_32(void); -INLINE uint OPER_AX_IX_8(void); -INLINE uint OPER_AX_IX_16(void); -INLINE uint OPER_AX_IX_32(void); - -INLINE uint OPER_A7_PI_8(void); -INLINE uint OPER_A7_PD_8(void); - -INLINE uint OPER_AW_8(void); -INLINE uint OPER_AW_16(void); -INLINE uint OPER_AW_32(void); -INLINE uint OPER_AL_8(void); -INLINE uint OPER_AL_16(void); -INLINE uint OPER_AL_32(void); -INLINE uint OPER_PCDI_8(void); -INLINE uint OPER_PCDI_16(void); -INLINE uint OPER_PCDI_32(void); -INLINE uint OPER_PCIX_8(void); -INLINE uint OPER_PCIX_16(void); -INLINE uint OPER_PCIX_32(void); - -/* Stack operations */ -INLINE void m68ki_push_16(uint value); -INLINE void m68ki_push_32(uint value); -INLINE uint m68ki_pull_16(void); -INLINE uint m68ki_pull_32(void); - -/* Program flow operations */ -INLINE void m68ki_jump(uint new_pc); -INLINE void m68ki_jump_vector(uint vector); -INLINE void m68ki_branch_8(uint offset); -INLINE void m68ki_branch_16(uint offset); -INLINE void m68ki_branch_32(uint offset); - -/* Status register operations. */ -INLINE void m68ki_set_s_flag(uint value); /* Only bit 2 of value should be set (i.e. 4 or 0) */ -INLINE void m68ki_set_ccr(uint value); /* set the condition code register */ -INLINE void m68ki_set_sr(uint value); /* set the status register */ - -/* Exception processing */ -INLINE uint m68ki_init_exception(void); /* Initial exception processing */ -INLINE void m68ki_stack_frame_3word(uint pc, uint sr); /* Stack various frame types */ -#if M68K_EMULATE_ADDRESS_ERROR -INLINE void m68ki_stack_frame_buserr(uint sr); -#endif -INLINE void m68ki_exception_trap(uint vector); -INLINE void m68ki_exception_trapN(uint vector); -#if M68K_EMULATE_TRACE -INLINE void m68ki_exception_trace(void); -#endif -static void m68ki_exception_privilege_violation(void); /* do not inline in order to reduce function size and allow inlining of read/write functions by the compile */ -INLINE void m68ki_exception_1010(void); -INLINE void m68ki_exception_1111(void); -INLINE void m68ki_exception_illegal(void); -#if M68K_EMULATE_ADDRESS_ERROR -INLINE void m68ki_exception_address_error(void); -#endif -INLINE void m68ki_exception_interrupt(uint int_level); -INLINE void m68ki_check_interrupts(void); /* ASG: check for interrupts */ - -/* ======================================================================== */ -/* =========================== UTILITY FUNCTIONS ========================== */ -/* ======================================================================== */ - - -/* ---------------------------- Read Immediate ---------------------------- */ - -/* Handles all immediate reads, does address error check, function code setting, - * and prefetching if they are enabled in m68kconf.h +/* Pulse the RESET pin on the CPU. + * You *MUST* reset the CPU at least once to initialize the emulation */ -INLINE uint m68ki_read_imm_16(void) -{ - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#if M68K_CHECK_PC_ADDRESS_ERROR - m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#endif -#if M68K_EMULATE_PREFETCH - if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) - { - CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); - CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); - } - REG_PC += 2; - return MASK_OUT_ABOVE_16(CPU_PREF_DATA >> ((2-((REG_PC-2)&2))<<3)); -#else - uint pc = REG_PC; - REG_PC += 2; - return m68k_read_immediate_16(pc); -#endif /* M68K_EMULATE_PREFETCH */ -} +extern void m68k_pulse_reset(void); +extern void s68k_pulse_reset(void); -INLINE uint m68ki_read_imm_32(void) -{ -#if M68K_EMULATE_PREFETCH - uint temp_val; +/* Run until given cycle count is reached */ +extern void m68k_run(unsigned int cycles); +extern void s68k_run(unsigned int cycles); - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#if M68K_CHECK_PC_ADDRESS_ERROR - m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#endif - if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) - { - CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); - CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); - } - temp_val = CPU_PREF_DATA; - REG_PC += 2; - if(MASK_OUT_BELOW_2(REG_PC) != CPU_PREF_ADDR) - { - CPU_PREF_ADDR = MASK_OUT_BELOW_2(REG_PC); - CPU_PREF_DATA = m68k_read_immediate_32(CPU_PREF_ADDR); - temp_val = MASK_OUT_ABOVE_32((temp_val << 16) | (CPU_PREF_DATA >> 16)); - } - REG_PC += 2; - - return temp_val; -#else - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#if M68K_CHECK_PC_ADDRESS_ERROR - m68ki_check_address_error(REG_PC, MODE_READ, FLAG_S | FUNCTION_CODE_USER_PROGRAM) /* auto-disable (see m68kcpu.h) */ -#endif - uint pc = REG_PC; - REG_PC += 4; - return m68k_read_immediate_32(pc); -#endif /* M68K_EMULATE_PREFETCH */ -} - - - -/* ------------------------- Top level read/write ------------------------- */ - -/* Handles all memory accesses (except for immediate reads if they are - * configured to use separate functions in m68kconf.h). - * All memory accesses must go through these top level functions. - * These functions will also check for address error and set the function - * code if they are enabled in m68kconf.h. +/* Set the IPL0-IPL2 pins on the CPU (IRQ). + * A transition from < 7 to 7 will cause a non-maskable interrupt (NMI). + * Setting IRQ to 0 will clear an interrupt request. */ -INLINE uint m68ki_read_8(uint address) -{ - cpu_memory_map *temp = &m68ki_cpu.memory_map[((address)>>16)&0xff];; +extern void m68k_set_irq(unsigned int int_level); +extern void m68k_set_irq_delay(unsigned int int_level); +extern void m68k_update_irq(unsigned int mask); +extern void s68k_update_irq(unsigned int mask); - m68ki_set_fc(FLAG_S | m68ki_get_address_space()) /* auto-disable (see m68kcpu.h) */ - - if (temp->read8) return (*temp->read8)(ADDRESS_68K(address)); - else return READ_BYTE(temp->base, (address) & 0xffff); -} - -INLINE uint m68ki_read_16(uint address) -{ - cpu_memory_map *temp; - - m68ki_set_fc(FLAG_S | m68ki_get_address_space()) /* auto-disable (see m68kcpu.h) */ - m68ki_check_address_error(address, MODE_READ, FLAG_S | m68ki_get_address_space()) /* auto-disable (see m68kcpu.h) */ - - temp = &m68ki_cpu.memory_map[((address)>>16)&0xff]; - if (temp->read16) return (*temp->read16)(ADDRESS_68K(address)); - else return *(uint16 *)(temp->base + ((address) & 0xffff)); -} - -INLINE uint m68ki_read_32(uint address) -{ - cpu_memory_map *temp; - - m68ki_set_fc(FLAG_S | m68ki_get_address_space()) /* auto-disable (see m68kcpu.h) */ - m68ki_check_address_error(address, MODE_READ, FLAG_S | m68ki_get_address_space()) /* auto-disable (see m68kcpu.h) */ - - temp = &m68ki_cpu.memory_map[((address)>>16)&0xff]; - if (temp->read16) return ((*temp->read16)(ADDRESS_68K(address)) << 16) | ((*temp->read16)(ADDRESS_68K(address + 2))); - else return m68k_read_immediate_32(address); -} - -INLINE void m68ki_write_8(uint address, uint value) -{ - cpu_memory_map *temp; - - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_DATA) /* auto-disable (see m68kcpu.h) */ - - temp = &m68ki_cpu.memory_map[((address)>>16)&0xff]; - if (temp->write8) (*temp->write8)(ADDRESS_68K(address),value); - else WRITE_BYTE(temp->base, (address) & 0xffff, value); -} - -INLINE void m68ki_write_16(uint address, uint value) -{ - cpu_memory_map *temp; - - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_DATA) /* auto-disable (see m68kcpu.h) */ - m68ki_check_address_error(address, MODE_WRITE, FLAG_S | FUNCTION_CODE_USER_DATA); /* auto-disable (see m68kcpu.h) */ - - temp = &m68ki_cpu.memory_map[((address)>>16)&0xff]; - if (temp->write16) (*temp->write16)(ADDRESS_68K(address),value); - else *(uint16 *)(temp->base + ((address) & 0xffff)) = value; -} - -INLINE void m68ki_write_32(uint address, uint value) -{ - cpu_memory_map *temp; - - m68ki_set_fc(FLAG_S | FUNCTION_CODE_USER_DATA) /* auto-disable (see m68kcpu.h) */ - m68ki_check_address_error(address, MODE_WRITE, FLAG_S | FUNCTION_CODE_USER_DATA) /* auto-disable (see m68kcpu.h) */ - - temp = &m68ki_cpu.memory_map[((address)>>16)&0xff]; - if (temp->write16) (*temp->write16)(ADDRESS_68K(address),value>>16); - else *(uint16 *)(temp->base + ((address) & 0xffff)) = value >> 16; - - temp = &m68ki_cpu.memory_map[((address + 2)>>16)&0xff]; - if (temp->write16) (*temp->write16)(ADDRESS_68K(address+2),value&0xffff); - else *(uint16 *)(temp->base + ((address + 2) & 0xffff)) = value; -} +/* Halt the CPU as if you pulsed the HALT pin. */ +extern void m68k_pulse_halt(void); +extern void m68k_clear_halt(void); +extern void s68k_pulse_halt(void); +extern void s68k_clear_halt(void); -/* --------------------- Effective Address Calculation -------------------- */ - -/* The program counter relative addressing modes cause operands to be - * retrieved from program space, not data space. +/* Peek at the internals of a CPU context. This can either be a context + * retrieved using m68k_get_context() or the currently running context. + * If context is NULL, the currently running CPU context will be used. */ -INLINE uint m68ki_get_ea_pcdi(void) -{ - uint old_pc = REG_PC; - m68ki_use_program_space() /* auto-disable */ - return old_pc + MAKE_INT_16(m68ki_read_imm_16()); -} +extern unsigned int m68k_get_reg(m68k_register_t reg); +extern unsigned int s68k_get_reg(m68k_register_t reg); - -INLINE uint m68ki_get_ea_pcix(void) -{ - m68ki_use_program_space() /* auto-disable */ - return m68ki_get_ea_ix(REG_PC); -} - -/* Indexed addressing modes are encoded as follows: - * - * Base instruction format: - * F E D C B A 9 8 7 6 | 5 4 3 | 2 1 0 - * x x x x x x x x x x | 1 1 0 | BASE REGISTER (An) - * - * Base instruction format for destination EA in move instructions: - * F E D C | B A 9 | 8 7 6 | 5 4 3 2 1 0 - * x x x x | BASE REG | 1 1 0 | X X X X X X (An) - * - * Brief extension format: - * F | E D C | B | A 9 | 8 | 7 6 5 4 3 2 1 0 - * D/A | REGISTER | W/L | SCALE | 0 | DISPLACEMENT - * - * Full extension format: - * F E D C B A 9 8 7 6 5 4 3 2 1 0 - * D/A | REGISTER | W/L | SCALE | 1 | BS | IS | BD SIZE | 0 | I/IS - * BASE DISPLACEMENT (0, 16, 32 bit) (bd) - * OUTER DISPLACEMENT (0, 16, 32 bit) (od) - * - * D/A: 0 = Dn, 1 = An (Xn) - * W/L: 0 = W (sign extend), 1 = L (.SIZE) - * SCALE: 00=1, 01=2, 10=4, 11=8 (*SCALE) - * BS: 0=add base reg, 1=suppress base reg (An suppressed) - * IS: 0=add index, 1=suppress index (Xn suppressed) - * BD SIZE: 00=reserved, 01=NULL, 10=Word, 11=Long (size of bd) - * - * IS I/IS Operation - * 0 000 No Memory Indirect - * 0 001 indir prex with null outer - * 0 010 indir prex with word outer - * 0 011 indir prex with long outer - * 0 100 reserved - * 0 101 indir postx with null outer - * 0 110 indir postx with word outer - * 0 111 indir postx with long outer - * 1 000 no memory indirect - * 1 001 mem indir with null outer - * 1 010 mem indir with word outer - * 1 011 mem indir with long outer - * 1 100-111 reserved - */ -INLINE uint m68ki_get_ea_ix(uint An) -{ - /* An = base register */ - uint extension = m68ki_read_imm_16(); - - uint Xn = 0; /* Index register */ - - /* Calculate index */ - Xn = REG_DA[extension>>12]; /* Xn */ - if(!BIT_B(extension)) /* W/L */ - Xn = MAKE_INT_16(Xn); - - /* Add base register and displacement and return */ - return An + Xn + MAKE_INT_8(extension); -} - - -/* Fetch operands */ -INLINE uint OPER_AY_AI_8(void) {uint ea = EA_AY_AI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AY_AI_16(void) {uint ea = EA_AY_AI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AY_AI_32(void) {uint ea = EA_AY_AI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AY_PI_8(void) {uint ea = EA_AY_PI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AY_PI_16(void) {uint ea = EA_AY_PI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AY_PI_32(void) {uint ea = EA_AY_PI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AY_PD_8(void) {uint ea = EA_AY_PD_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AY_PD_16(void) {uint ea = EA_AY_PD_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AY_PD_32(void) {uint ea = EA_AY_PD_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AY_DI_8(void) {uint ea = EA_AY_DI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AY_DI_16(void) {uint ea = EA_AY_DI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AY_DI_32(void) {uint ea = EA_AY_DI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AY_IX_8(void) {uint ea = EA_AY_IX_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AY_IX_16(void) {uint ea = EA_AY_IX_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AY_IX_32(void) {uint ea = EA_AY_IX_32(); return m68ki_read_32(ea);} - -INLINE uint OPER_AX_AI_8(void) {uint ea = EA_AX_AI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AX_AI_16(void) {uint ea = EA_AX_AI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AX_AI_32(void) {uint ea = EA_AX_AI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AX_PI_8(void) {uint ea = EA_AX_PI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AX_PI_16(void) {uint ea = EA_AX_PI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AX_PI_32(void) {uint ea = EA_AX_PI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AX_PD_8(void) {uint ea = EA_AX_PD_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AX_PD_16(void) {uint ea = EA_AX_PD_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AX_PD_32(void) {uint ea = EA_AX_PD_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AX_DI_8(void) {uint ea = EA_AX_DI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AX_DI_16(void) {uint ea = EA_AX_DI_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AX_DI_32(void) {uint ea = EA_AX_DI_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AX_IX_8(void) {uint ea = EA_AX_IX_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AX_IX_16(void) {uint ea = EA_AX_IX_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AX_IX_32(void) {uint ea = EA_AX_IX_32(); return m68ki_read_32(ea);} - -INLINE uint OPER_A7_PI_8(void) {uint ea = EA_A7_PI_8(); return m68ki_read_8(ea); } -INLINE uint OPER_A7_PD_8(void) {uint ea = EA_A7_PD_8(); return m68ki_read_8(ea); } - -INLINE uint OPER_AW_8(void) {uint ea = EA_AW_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AW_16(void) {uint ea = EA_AW_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AW_32(void) {uint ea = EA_AW_32(); return m68ki_read_32(ea);} -INLINE uint OPER_AL_8(void) {uint ea = EA_AL_8(); return m68ki_read_8(ea); } -INLINE uint OPER_AL_16(void) {uint ea = EA_AL_16(); return m68ki_read_16(ea);} -INLINE uint OPER_AL_32(void) {uint ea = EA_AL_32(); return m68ki_read_32(ea);} -INLINE uint OPER_PCDI_8(void) {uint ea = EA_PCDI_8(); return m68ki_read_pcrel_8(ea); } -INLINE uint OPER_PCDI_16(void) {uint ea = EA_PCDI_16(); return m68ki_read_pcrel_16(ea);} -INLINE uint OPER_PCDI_32(void) {uint ea = EA_PCDI_32(); return m68ki_read_pcrel_32(ea);} -INLINE uint OPER_PCIX_8(void) {uint ea = EA_PCIX_8(); return m68ki_read_pcrel_8(ea); } -INLINE uint OPER_PCIX_16(void) {uint ea = EA_PCIX_16(); return m68ki_read_pcrel_16(ea);} -INLINE uint OPER_PCIX_32(void) {uint ea = EA_PCIX_32(); return m68ki_read_pcrel_32(ea);} - - - -/* ---------------------------- Stack Functions --------------------------- */ - -/* Push/pull data from the stack */ -INLINE void m68ki_push_16(uint value) -{ - REG_SP = MASK_OUT_ABOVE_32(REG_SP - 2); - m68ki_write_16(REG_SP, value); -} - -INLINE void m68ki_push_32(uint value) -{ - REG_SP = MASK_OUT_ABOVE_32(REG_SP - 4); - m68ki_write_32(REG_SP, value); -} - -INLINE uint m68ki_pull_16(void) -{ - uint sp = REG_SP; - REG_SP = MASK_OUT_ABOVE_32(REG_SP + 2); - return m68ki_read_16(sp); -} - -INLINE uint m68ki_pull_32(void) -{ - uint sp = REG_SP; - REG_SP = MASK_OUT_ABOVE_32(REG_SP + 4); - return m68ki_read_32(sp); -} - - - -/* ----------------------------- Program Flow ----------------------------- */ - -/* Jump to a new program location or vector. - * These functions will also call the pc_changed callback if it was enabled - * in m68kconf.h. - */ -INLINE void m68ki_jump(uint new_pc) -{ - REG_PC = new_pc; -} - -INLINE void m68ki_jump_vector(uint vector) -{ - m68ki_use_data_space() /* auto-disable (see m68kcpu.h) */ - REG_PC = m68ki_read_32(vector<<2); -} - - -/* Branch to a new memory location. - * The 32-bit branch will call pc_changed if it was enabled in m68kconf.h. - * So far I've found no problems with not calling pc_changed for 8 or 16 - * bit branches. - */ -INLINE void m68ki_branch_8(uint offset) -{ - REG_PC += MAKE_INT_8(offset); -} - -INLINE void m68ki_branch_16(uint offset) -{ - REG_PC += MAKE_INT_16(offset); -} - -INLINE void m68ki_branch_32(uint offset) -{ - REG_PC += offset; -} - - - -/* ---------------------------- Status Register --------------------------- */ - -/* Set the S flag and change the active stack pointer. - * Note that value MUST be 4 or 0. - */ -INLINE void m68ki_set_s_flag(uint value) -{ - /* Backup the old stack pointer */ - REG_SP_BASE[FLAG_S] = REG_SP; - /* Set the S flag */ - FLAG_S = value; - /* Set the new stack pointer */ - REG_SP = REG_SP_BASE[FLAG_S]; -} - - -/* Set the condition code register */ -INLINE void m68ki_set_ccr(uint value) -{ - FLAG_X = BIT_4(value) << 4; - FLAG_N = BIT_3(value) << 4; - FLAG_Z = !BIT_2(value); - FLAG_V = BIT_1(value) << 6; - FLAG_C = BIT_0(value) << 8; -} - - -/* Set the status register and check for interrupts */ -INLINE void m68ki_set_sr(uint value) -{ - /* Set the status register */ - FLAG_T1 = BIT_F(value); - FLAG_INT_MASK = value & 0x0700; - m68ki_set_ccr(value); - m68ki_set_s_flag((value >> 11) & 4); - - /* Check current IRQ status */ - m68ki_check_interrupts(); -} - - -/* ------------------------- Exception Processing ------------------------- */ - -/* Initiate exception processing */ -INLINE uint m68ki_init_exception(void) -{ - /* Save the old status register */ - uint sr = m68ki_get_sr(); - - /* Turn off trace flag, clear pending traces */ - FLAG_T1 = 0; - m68ki_clear_trace() - - /* Enter supervisor mode */ - m68ki_set_s_flag(SFLAG_SET); - - return sr; -} - -/* 3 word stack frame (68000 only) */ -INLINE void m68ki_stack_frame_3word(uint pc, uint sr) -{ - m68ki_push_32(pc); - m68ki_push_16(sr); -} - -#if M68K_EMULATE_ADDRESS_ERROR -/* Bus error stack frame (68000 only). - */ -INLINE void m68ki_stack_frame_buserr(uint sr) -{ - m68ki_push_32(REG_PC); - m68ki_push_16(sr); - m68ki_push_16(REG_IR); - m68ki_push_32(m68ki_cpu.aerr_address); /* access address */ - /* 0 0 0 0 0 0 0 0 0 0 0 R/W I/N FC - * R/W 0 = write, 1 = read - * I/N 0 = instruction, 1 = not - * FC 3-bit function code - */ - m68ki_push_16(m68ki_cpu.aerr_write_mode | CPU_INSTR_MODE | m68ki_cpu.aerr_fc); -} -#endif - -/* Used for Group 2 exceptions. - */ -INLINE void m68ki_exception_trap(uint vector) -{ - uint sr = m68ki_init_exception(); - - m68ki_stack_frame_3word(REG_PC, sr); - - m68ki_jump_vector(vector); - - /* Use up some clock cycles */ - USE_CYCLES(CYC_EXCEPTION[vector]); -} - -/* Trap#n stacks a 0 frame but behaves like group2 otherwise */ -INLINE void m68ki_exception_trapN(uint vector) -{ - uint sr = m68ki_init_exception(); - m68ki_stack_frame_3word(REG_PC, sr); - m68ki_jump_vector(vector); - - /* Use up some clock cycles */ - USE_CYCLES(CYC_EXCEPTION[vector]); -} - -#if M68K_EMULATE_TRACE -/* Exception for trace mode */ -INLINE void m68ki_exception_trace(void) -{ - uint sr = m68ki_init_exception(); - - #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON - CPU_INSTR_MODE = INSTRUCTION_NO; - #endif /* M68K_EMULATE_ADDRESS_ERROR */ - - m68ki_stack_frame_3word(REG_PC, sr); - m68ki_jump_vector(EXCEPTION_TRACE); - - /* Trace nullifies a STOP instruction */ - CPU_STOPPED &= ~STOP_LEVEL_STOP; - - /* Use up some clock cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_TRACE]); -} -#endif - -/* Exception for privilege violation */ -static void m68ki_exception_privilege_violation(void) -{ - uint sr = m68ki_init_exception(); - - #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON - CPU_INSTR_MODE = INSTRUCTION_NO; - #endif /* M68K_EMULATE_ADDRESS_ERROR */ - - m68ki_stack_frame_3word(REG_PC-2, sr); - m68ki_jump_vector(EXCEPTION_PRIVILEGE_VIOLATION); - - /* Use up some clock cycles and undo the instruction's cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_PRIVILEGE_VIOLATION] - CYC_INSTRUCTION[REG_IR]); -} - -/* Exception for A-Line instructions */ -INLINE void m68ki_exception_1010(void) -{ - uint sr = m68ki_init_exception(); - m68ki_stack_frame_3word(REG_PC-2, sr); - m68ki_jump_vector(EXCEPTION_1010); - - /* Use up some clock cycles and undo the instruction's cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1010] - CYC_INSTRUCTION[REG_IR]); -} - -/* Exception for F-Line instructions */ -INLINE void m68ki_exception_1111(void) -{ - uint sr = m68ki_init_exception(); - m68ki_stack_frame_3word(REG_PC-2, sr); - m68ki_jump_vector(EXCEPTION_1111); - - /* Use up some clock cycles and undo the instruction's cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_1111] - CYC_INSTRUCTION[REG_IR]); -} - -/* Exception for illegal instructions */ -INLINE void m68ki_exception_illegal(void) -{ - uint sr = m68ki_init_exception(); - - #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON - CPU_INSTR_MODE = INSTRUCTION_NO; - #endif /* M68K_EMULATE_ADDRESS_ERROR */ - - m68ki_stack_frame_3word(REG_PC-2, sr); - m68ki_jump_vector(EXCEPTION_ILLEGAL_INSTRUCTION); - - /* Use up some clock cycles and undo the instruction's cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ILLEGAL_INSTRUCTION] - CYC_INSTRUCTION[REG_IR]); -} - - -#if M68K_EMULATE_ADDRESS_ERROR -/* Exception for address error */ -INLINE void m68ki_exception_address_error(void) -{ - uint sr = m68ki_init_exception(); - - /* If we were processing a bus error, address error, or reset, - * this is a catastrophic failure. - * Halt the CPU - */ - if(CPU_RUN_MODE == RUN_MODE_BERR_AERR_RESET) - { - CPU_STOPPED = STOP_LEVEL_HALT; - SET_CYCLES(m68ki_cpu.cycle_end - CYC_INSTRUCTION[REG_IR]); - return; - } - CPU_RUN_MODE = RUN_MODE_BERR_AERR_RESET; - - /* Note: This is implemented for 68000 only! */ - m68ki_stack_frame_buserr(sr); - - m68ki_jump_vector(EXCEPTION_ADDRESS_ERROR); - - /* Use up some clock cycles and undo the instruction's cycles */ - USE_CYCLES(CYC_EXCEPTION[EXCEPTION_ADDRESS_ERROR] - CYC_INSTRUCTION[REG_IR]); -} -#endif - -/* Service an interrupt request and start exception processing */ -INLINE void m68ki_exception_interrupt(uint int_level) -{ - uint vector, sr, new_pc; - - #if M68K_EMULATE_ADDRESS_ERROR == OPT_ON - CPU_INSTR_MODE = INSTRUCTION_NO; - #endif /* M68K_EMULATE_ADDRESS_ERROR */ - - /* Turn off the stopped state */ - CPU_STOPPED &= STOP_LEVEL_HALT; - - /* If we are halted, don't do anything */ - if(CPU_STOPPED) - return; - - /* Always use the autovectors. */ - vector = EXCEPTION_INTERRUPT_AUTOVECTOR+int_level; - - /* Start exception processing */ - sr = m68ki_init_exception(); - - /* Set the interrupt mask to the level of the one being serviced */ - FLAG_INT_MASK = int_level<<8; - - /* Acknowledge the interrupt */ - m68ki_int_ack(int_level); - - /* Get the new PC */ - m68ki_use_data_space() /* auto-disable (see m68kcpu.h) */ - new_pc = m68ki_read_32(vector<<2); - - /* If vector is uninitialized, call the uninitialized interrupt vector */ - if(new_pc == 0) - new_pc = m68ki_read_32((EXCEPTION_UNINITIALIZED_INTERRUPT<<2)); - - /* Generate a stack frame */ - m68ki_stack_frame_3word(REG_PC, sr); - - m68ki_jump(new_pc); - - /* Update cycle count now */ - USE_CYCLES(CYC_EXCEPTION[vector]); -} - -/* ASG: Check for interrupts */ -INLINE void m68ki_check_interrupts(void) -{ - if(CPU_INT_LEVEL > FLAG_INT_MASK) - m68ki_exception_interrupt(CPU_INT_LEVEL>>8); -} +/* Poke values into the internals of the currently running CPU context */ +extern void m68k_set_reg(m68k_register_t reg, unsigned int value); +extern void s68k_set_reg(m68k_register_t reg, unsigned int value); /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ -#endif /* M68KCPU__HEADER */ +#endif /* M68K__HEADER */