From 5e2ed42295c062e43541381f705fe7645271962c Mon Sep 17 00:00:00 2001 From: twinaphex Date: Tue, 25 Jul 2017 14:08:22 +0200 Subject: [PATCH] Revert these files --- core/cart_hw/svp/ssp16.c | 7 +- core/cd_hw/cdd.c | 27 +- core/cd_hw/cdd.h | 2 - core/m68k/m68k.h | 1675 ++++++++++++++++++++++++++++++-------- core/m68k/m68kops.h | 2 + 5 files changed, 1344 insertions(+), 369 deletions(-) diff --git a/core/cart_hw/svp/ssp16.c b/core/cart_hw/svp/ssp16.c index 9b98629..f2f648c 100644 --- a/core/cart_hw/svp/ssp16.c +++ b/core/cart_hw/svp/ssp16.c @@ -191,6 +191,7 @@ #include "shared.h" + #define u32 unsigned int /*#define USE_DEBUGGER*/ @@ -1015,13 +1016,13 @@ static void debug_dump_mem(void) static void debug_dump2file(const char *fname, void *mem, int len) { - RFILE *f = filestream_open(fname, RFILE_MODE_WRITE, -1); + FILE *f = fopen(fname, "wb"); unsigned short *p = mem; int i; if (f) { for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8); - filestream_write(f, mem, len); - filestream_close(f); + fwrite(mem, 1, len, f); + fclose(f); for (i = 0; i < len/2; i++) p[i] = (p[i]<<8) | (p[i]>>8); printf("dumped to %s\n", fname); } diff --git a/core/cd_hw/cdd.c b/core/cd_hw/cdd.c index 04725b0..62618e0 100644 --- a/core/cd_hw/cdd.c +++ b/core/cd_hw/cdd.c @@ -129,31 +129,6 @@ static const unsigned char waveHeader[28] = 0x02,0x00,0x44,0xac,0x00,0x00,0x10,0xb1,0x02,0x00,0x04,0x00,0x10,0x00 }; -/* vorbis file callbacks to use RFILEs*/ -#if defined(USE_LIBTREMOR) || defined(USE_LIBVORBIS) - size_t fs_vorbis_read(void *ptr, size_t size, size_t nmemb, void *datasource) - { - return filestream_read(datasource, ptr, size*nmemb); - } - - int fs_vorbis_seek(void *datasource, ogg_int64_t offset, int whence) - { - return filestream_seek(datasource, offset, whence); - } - - int fs_vorbis_close (void *datasource) - { - return filestream_close(datasource); - } - - long fs_vorbis_tell(void *datasource) - { - return filestream_tell(datasource); - } - - ov_callbacks fs_ov_callbacks = { filestream_read, fs_vorbis_seek, fs_vorbis_close, fs_vorbis_tell }; -#endif - /* supported WAVE file extensions */ static const char extensions[SUPPORTED_EXT][16] = { @@ -1290,7 +1265,7 @@ static void cdd_read_subcode(void) void cdd_update(void) { #ifdef LOG_CDD - error("LBA = %d (track n°%d)(latency=%d)\n", cdd.lba, cdd.index, cdd.latency); + error("LBA = %d (track n?%d)(latency=%d)\n", cdd.lba, cdd.index, cdd.latency); #endif /* seeking disc */ diff --git a/core/cd_hw/cdd.h b/core/cd_hw/cdd.h index fd564bc..bd09677 100644 --- a/core/cd_hw/cdd.h +++ b/core/cd_hw/cdd.h @@ -61,8 +61,6 @@ #define CD_MAX_TRACKS 100 -typedef struct RFILE RFILE; - /* CD track */ typedef struct { diff --git a/core/m68k/m68k.h b/core/m68k/m68k.h index 078cbdf..de394b5 100644 --- a/core/m68k/m68k.h +++ b/core/m68k/m68k.h @@ -1,391 +1,1390 @@ -#ifndef M68K__HEADER -#define M68K__HEADER +#ifndef M68KCPU__HEADER +#define M68KCPU__HEADER /* ======================================================================== */ -/* ========================= 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 ============================== */ +/* GENERIC 68K CORE */ /* ======================================================================== */ +#include +#include +#include + +#if M68K_EMULATE_ADDRESS_ERROR #include -#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 */ +#endif /* M68K_EMULATE_ADDRESS_ERROR */ +#include "m68k.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 +/* 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 -/* Special interrupt acknowledge values. - * Use these as special returns from the interrupt acknowledge callback - * (specified later in this header). - */ +/* Different ways to stop the CPU */ +#define STOP_LEVEL_STOP 1 +#define STOP_LEVEL_HALT 2 -/* 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 +/* 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 -/* 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 - - -/* 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 */ - -#if M68K_EMULATE_PREFETCH - /* 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 */ +#define RUN_MODE_NORMAL 0 +#define RUN_MODE_BERR_AERR_RESET 1 #endif - /* 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; - +#ifndef NULL +#define NULL ((void*)0) +#endif /* ======================================================================== */ -/* ============================== CALLBACKS =============================== */ +/* ================================ MACROS ================================ */ /* ======================================================================== */ -/* 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. - */ + +/* ---------------------------- General Macros ---------------------------- */ + +/* Bit Isolation Macros */ +#define BIT_0(A) ((A) & 0x00000001) +#define BIT_1(A) ((A) & 0x00000002) +#define BIT_2(A) ((A) & 0x00000004) +#define BIT_3(A) ((A) & 0x00000008) +#define BIT_4(A) ((A) & 0x00000010) +#define BIT_5(A) ((A) & 0x00000020) +#define BIT_6(A) ((A) & 0x00000040) +#define BIT_7(A) ((A) & 0x00000080) +#define BIT_8(A) ((A) & 0x00000100) +#define BIT_9(A) ((A) & 0x00000200) +#define BIT_A(A) ((A) & 0x00000400) +#define BIT_B(A) ((A) & 0x00000800) +#define BIT_C(A) ((A) & 0x00001000) +#define BIT_D(A) ((A) & 0x00002000) +#define BIT_E(A) ((A) & 0x00004000) +#define BIT_F(A) ((A) & 0x00008000) +#define BIT_10(A) ((A) & 0x00010000) +#define BIT_11(A) ((A) & 0x00020000) +#define BIT_12(A) ((A) & 0x00040000) +#define BIT_13(A) ((A) & 0x00080000) +#define BIT_14(A) ((A) & 0x00100000) +#define BIT_15(A) ((A) & 0x00200000) +#define BIT_16(A) ((A) & 0x00400000) +#define BIT_17(A) ((A) & 0x00800000) +#define BIT_18(A) ((A) & 0x01000000) +#define BIT_19(A) ((A) & 0x02000000) +#define BIT_1A(A) ((A) & 0x04000000) +#define BIT_1B(A) ((A) & 0x08000000) +#define BIT_1C(A) ((A) & 0x10000000) +#define BIT_1D(A) ((A) & 0x20000000) +#define BIT_1E(A) ((A) & 0x40000000) +#define BIT_1F(A) ((A) & 0x80000000) + +/* Get the most significant bit for specific sizes */ +#define GET_MSB_8(A) ((A) & 0x80) +#define GET_MSB_9(A) ((A) & 0x100) +#define GET_MSB_16(A) ((A) & 0x8000) +#define GET_MSB_17(A) ((A) & 0x10000) +#define GET_MSB_32(A) ((A) & 0x80000000) +#if M68K_USE_64_BIT +#define GET_MSB_33(A) ((A) & 0x100000000) +#endif /* M68K_USE_64_BIT */ + +/* Isolate nibbles */ +#define LOW_NIBBLE(A) ((A) & 0x0f) +#define HIGH_NIBBLE(A) ((A) & 0xf0) + +/* These are used to isolate 8, 16, and 32 bit sizes */ +#define MASK_OUT_ABOVE_2(A) ((A) & 3) +#define MASK_OUT_ABOVE_8(A) ((A) & 0xff) +#define MASK_OUT_ABOVE_16(A) ((A) & 0xffff) +#define MASK_OUT_BELOW_2(A) ((A) & ~3) +#define MASK_OUT_BELOW_8(A) ((A) & ~0xff) +#define MASK_OUT_BELOW_16(A) ((A) & ~0xffff) + +/* No need to mask if we are 32 bit */ +#if M68K_INT_GT_32_BIT || M68K_USE_64_BIT + #define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff) + #define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff) +#else + #define MASK_OUT_ABOVE_32(A) (A) + #define MASK_OUT_BELOW_32(A) 0 +#endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */ + +/* Simulate address lines of 68k family */ +#define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK) + + +/* Shift & Rotate Macros. */ +#define LSL(A, C) ((A) << (C)) +#define LSR(A, C) ((A) >> (C)) + +/* Some > 32-bit optimizations */ +#if M68K_INT_GT_32_BIT + /* Shift left and right */ + #define LSR_32(A, C) ((A) >> (C)) + #define LSL_32(A, C) ((A) << (C)) +#else + /* We have to do this because the morons at ANSI decided that shifts + * by >= data size are undefined. + */ + #define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0) + #define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0) +#endif /* M68K_INT_GT_32_BIT */ + +#if M68K_USE_64_BIT + #define LSL_32_64(A, C) ((A) << (C)) + #define LSR_32_64(A, C) ((A) >> (C)) + #define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C))) + #define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C))) +#endif /* M68K_USE_64_BIT */ + +#define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C))) +#define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C))) +#define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C))) +#define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C))) +#define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C))) +#define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C))) + +#define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C))) +#define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C))) +#define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C))) +#define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C))) +#define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C))) +#define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C))) + + + +/* ------------------------------ CPU Access ------------------------------ */ + +/* Access the CPU registers */ +#define REG_DA m68ki_cpu.dar /* easy access to data and address regs */ +#define REG_D m68ki_cpu.dar +#define REG_A (m68ki_cpu.dar+8) +#define REG_PC m68ki_cpu.pc +#define REG_SP_BASE m68ki_cpu.sp +#define REG_USP m68ki_cpu.sp[0] +#define REG_ISP m68ki_cpu.sp[4] +#define REG_SP m68ki_cpu.dar[15] +#define REG_IR m68ki_cpu.ir + +#define FLAG_T1 m68ki_cpu.t1_flag +#define FLAG_S m68ki_cpu.s_flag +#define FLAG_X m68ki_cpu.x_flag +#define FLAG_N m68ki_cpu.n_flag +#define FLAG_Z m68ki_cpu.not_z_flag +#define FLAG_V m68ki_cpu.v_flag +#define FLAG_C m68ki_cpu.c_flag +#define FLAG_INT_MASK m68ki_cpu.int_mask + +#define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */ +#define CPU_STOPPED m68ki_cpu.stopped +#if M68K_EMULATE_PREFETCH +#define CPU_PREF_ADDR m68ki_cpu.pref_addr +#define CPU_PREF_DATA m68ki_cpu.pref_data +#endif +#define CPU_ADDRESS_MASK 0x00ffffff +#if M68K_EMULATE_ADDRESS_ERROR +#define CPU_INSTR_MODE m68ki_cpu.instr_mode +#define CPU_RUN_MODE m68ki_cpu.run_mode +#endif + +#define CYC_INSTRUCTION m68ki_cycles +#define CYC_EXCEPTION m68ki_exception_cycle_table +#define CYC_BCC_NOTAKE_B ( -2 * 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) #if M68K_EMULATE_INT_ACK == OPT_ON -/* 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)); +#define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback #endif - #if M68K_EMULATE_RESET == OPT_ON -/* 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)); +#define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback #endif - #if M68K_TAS_HAS_CALLBACK == OPT_ON -/* 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)); +#define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback #endif - #if M68K_EMULATE_FC == OPT_ON -/* 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)); +#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 + */ + +/* 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) + + /* ======================================================================== */ -/* ====================== FUNCTIONS TO ACCESS THE CPU ===================== */ +/* =============================== PROTOTYPES ============================= */ /* ======================================================================== */ -/* Do whatever initialisations the core requires. Should be called - * at least once at init time. +/* 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. */ -extern void m68k_init(void); -extern void s68k_init(void); +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 +}; -/* Pulse the RESET pin on the CPU. - * You *MUST* reset the CPU at least once to initialize the emulation +/* 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 */ -extern void m68k_pulse_reset(void); -extern void s68k_pulse_reset(void); +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 */ +} -/* Run until given cycle count is reached */ -extern void m68k_run(unsigned int cycles); -extern void s68k_run(unsigned int cycles); +INLINE uint m68ki_read_imm_32(void) +{ +#if M68K_EMULATE_PREFETCH + uint temp_val; -/* 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. + 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. */ -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); +INLINE uint m68ki_read_8(uint address) +{ + cpu_memory_map *temp = &m68ki_cpu.memory_map[((address)>>16)&0xff];; -/* 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); + 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; +} -/* 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. +/* --------------------- Effective Address Calculation -------------------- */ + +/* The program counter relative addressing modes cause operands to be + * retrieved from program space, not data space. */ -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_pcdi(void) +{ + uint old_pc = REG_PC; + m68ki_use_program_space() /* auto-disable */ + return old_pc + MAKE_INT_16(m68ki_read_imm_16()); +} -/* 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); + +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); +} /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ -#endif /* M68K__HEADER */ +#endif /* M68KCPU__HEADER */ diff --git a/core/m68k/m68kops.h b/core/m68k/m68kops.h index d110b72..56694bf 100644 --- a/core/m68k/m68kops.h +++ b/core/m68k/m68kops.h @@ -25483,3 +25483,5 @@ static void m68ki_build_opcode_table(void) /* ======================================================================== */ /* ============================== END OF FILE ============================= */ /* ======================================================================== */ + +