/* ======================================================================== */ /* ========================= LICENSING & COPYRIGHT ======================== */ /* ======================================================================== */ /* * MUSASHI * Version 3.4 * * A portable Motorola M680x0 processor emulation engine. * Copyright 1998-2001 Karl Stenerud. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #ifndef M68K__HEADER #define M68K__HEADER /* ======================================================================== */ /* ============================= CONFIGURATION ============================ */ /* ======================================================================== */ /* Import the configuration for this build */ #include "m68kconf.h" /* ======================================================================== */ /* ============================ GENERAL DEFINES =========================== */ /* ======================================================================== */ /* 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 /* Special interrupt acknowledge values. * Use these as special returns from the interrupt acknowledge callback * (specified later in this header). */ /* Causes an interrupt autovector (0x18 + interrupt level) to be taken. * This happens in a real 68K if VPA or AVEC is asserted during an interrupt * acknowledge cycle instead of DTACK. */ #define M68K_INT_ACK_AUTOVECTOR 0xffffffff /* Causes the spurious interrupt vector (0x18) to be taken * This happens in a real 68K if BERR is asserted during the interrupt * acknowledge cycle (i.e. no devices responded to the acknowledge). */ #define M68K_INT_ACK_SPURIOUS 0xfffffffe /* CPU types for use in m68k_set_cpu_type() */ enum { M68K_CPU_TYPE_INVALID, M68K_CPU_TYPE_68000, M68K_CPU_TYPE_68010, M68K_CPU_TYPE_68EC020, M68K_CPU_TYPE_68020, M68K_CPU_TYPE_68030, /* Supported by disassembler ONLY */ M68K_CPU_TYPE_68040 /* Supported by disassembler ONLY */ }; /* 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 */ M68K_REG_MSP, /* Master Stack Pointer */ M68K_REG_SFC, /* Source Function Code */ M68K_REG_DFC, /* Destination Function Code */ M68K_REG_VBR, /* Vector Base Register */ M68K_REG_CACR, /* Cache Control Register */ M68K_REG_CAAR, /* Cache Address Register */ /* 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 */ /* Convenience registers */ M68K_REG_PPC, /* Previous value in the program counter */ M68K_REG_IR, /* Instruction register */ M68K_REG_CPU_TYPE /* Type of CPU being run */ } m68k_register_t; /* ======================================================================== */ /* ====================== FUNCTIONS CALLED BY THE CPU ===================== */ /* ======================================================================== */ /* You will have to implement these functions */ /* read/write functions called by the CPU to access memory. * while values used are 32 bits, only the appropriate number * of bits are relevant (i.e. in write_memory_8, only the lower 8 bits * of value should be written to memory). * * NOTE: I have separated the immediate and PC-relative memory fetches * from the other memory fetches because some systems require * differentiation between PROGRAM and DATA fetches (usually * for security setups such as encryption). * This separation can either be achieved by setting * M68K_SEPARATE_READS in m68kconf.h and defining * the read functions, or by setting M68K_EMULATE_FC and * making a function code callback function. * Using the callback offers better emulation coverage * because you can also monitor whether the CPU is in SYSTEM or * USER mode, but it is also slower. */ /* Read from anywhere */ unsigned int m68k_read_memory_8(unsigned int address); unsigned int m68k_read_memory_16(unsigned int address); unsigned int m68k_read_memory_32(unsigned int address); /* Read data immediately following the PC */ unsigned int m68k_read_immediate_16(unsigned int address); unsigned int m68k_read_immediate_32(unsigned int address); /* Read data relative to the PC */ unsigned int m68k_read_pcrelative_8(unsigned int address); unsigned int m68k_read_pcrelative_16(unsigned int address); unsigned int m68k_read_pcrelative_32(unsigned int address); /* Memory access for the disassembler */ unsigned int m68k_read_disassembler_8 (unsigned int address); unsigned int m68k_read_disassembler_16 (unsigned int address); unsigned int m68k_read_disassembler_32 (unsigned int address); /* Write to anywhere */ void m68k_write_memory_8(unsigned int address, unsigned int value); void m68k_write_memory_16(unsigned int address, unsigned int value); void m68k_write_memory_32(unsigned int address, unsigned int value); /* Special call to simulate undocumented 68k behavior when move.l with a * predecrement destination mode is executed. * To simulate real 68k behavior, first write the high word to * [address+2], and then write the low word to [address]. * * Enable this functionality with M68K_SIMULATE_PD_WRITES in m68kconf.h. */ void m68k_write_memory_32_pd(unsigned int address, unsigned int value); /* ======================================================================== */ /* ============================== 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. */ /* 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)); /* Set the callback for a breakpoint acknowledge (68010+). * You must enable M68K_EMULATE_BKPT_ACK in m68kconf.h. * The CPU will call the callback with whatever was in the data field of the * BKPT instruction for 68020+, or 0 for 68010. * Default behavior: do nothing. */ void m68k_set_bkpt_ack_callback(void (*callback)(unsigned int data)); /* 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)); /* Set the callback for informing of a large PC change. * You must enable M68K_MONITOR_PC in m68kconf.h. * The CPU calls this callback with the new PC value every time the PC changes * by a large value (currently set for changes by longwords). * Default behavior: do nothing. */ void m68k_set_pc_changed_callback(void (*callback)(unsigned int new_pc)); /* 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. */ void m68k_set_fc_callback(void (*callback)(unsigned int new_fc)); /* Set a callback for the instruction cycle of the CPU. * You must enable M68K_INSTRUCTION_HOOK in m68kconf.h. * The CPU calls this callback just before fetching the opcode in the * instruction cycle. * Default behavior: do nothing. */ void m68k_set_instr_hook_callback(void (*callback)(void)); /* ======================================================================== */ /* ====================== FUNCTIONS TO ACCESS THE CPU ===================== */ /* ======================================================================== */ /* Use this function to set the CPU type you want to emulate. * Currently supported types are: M68K_CPU_TYPE_68000, M68K_CPU_TYPE_68010, * M68K_CPU_TYPE_EC020, and M68K_CPU_TYPE_68020. */ void m68k_set_cpu_type(unsigned int cpu_type); /* Do whatever initialisations the core requires. Should be called * at least once at init time. */ void m68k_init(void); /* Pulse the RESET pin on the CPU. * You *MUST* reset the CPU at least once to initialize the emulation * Note: If you didn't call m68k_set_cpu_type() before resetting * the CPU for the first time, the CPU will be set to * M68K_CPU_TYPE_68000. */ void m68k_pulse_reset(void); /* execute num_cycles worth of instructions. returns number of cycles used */ int m68k_execute(int num_cycles); /* These functions let you read/write/modify the number of cycles left to run * while m68k_execute() is running. * These are useful if the 68k accesses a memory-mapped port on another device * that requires immediate processing by another CPU. */ int m68k_cycles_run(void); /* Number of cycles run so far */ int m68k_cycles_remaining(void); /* Number of cycles left */ void m68k_modify_timeslice(int cycles); /* Modify cycles left */ void m68k_end_timeslice(void); /* End timeslice now */ /* 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. */ void m68k_set_irq(unsigned int int_level); /* Halt the CPU as if you pulsed the HALT pin. */ void m68k_pulse_halt(void); /* Context switching to allow multiple CPUs */ /* Get the size of the cpu context in bytes */ unsigned int m68k_context_size(void); /* Get a cpu context */ unsigned int m68k_get_context(void* dst); /* set the current cpu context */ void m68k_set_context(void* dst); /* Register the CPU state information */ void m68k_state_register(const char *type); /* 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. */ unsigned int m68k_get_reg(void* context, m68k_register_t reg); /* Poke values into the internals of the currently running CPU context */ void m68k_set_reg(m68k_register_t reg, unsigned int value); /* Check if an instruction is valid for the specified CPU type */ unsigned int m68k_is_valid_instruction(unsigned int instruction, unsigned int cpu_type); /* Disassemble 1 instruction using the epecified CPU type at pc. Stores * disassembly in str_buff and returns the size of the instruction in bytes. */ unsigned int m68k_disassemble(char* str_buff, unsigned int pc, unsigned int cpu_type); /* ======================================================================== */ /* ============================== MAME STUFF ============================== */ /* ======================================================================== */ #if M68K_COMPILE_FOR_MAME == OPT_ON #include "m68kmame.h" #endif /* M68K_COMPILE_FOR_MAME */ /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ #endif /* M68K__HEADER */