src/musashi/m68kcpu.c

/* ======================================================================== */
/* ========================= LICENSING & COPYRIGHT ======================== */
/* ======================================================================== */

#if 0
static const char* copyright_notice =
"MUSASHI\n"
"Version 3.3 (2001-01-29)\n"
"A portable Motorola M680x0 processor emulation engine.\n"
"Copyright 1998-2001 Karl Stenerud.  All rights reserved.\n"
"\n"
"This code may be freely used for non-commercial purpooses as long as this\n"
"copyright notice remains unaltered in the source code and any binary files\n"
"containing this code in compiled form.\n"
"\n"
"All other lisencing terms must be negotiated with the author\n"
"(Karl Stenerud).\n"
"\n"
"The latest version of this code can be obtained at:\n"
"http://kstenerud.cjb.net\n"
;
#endif


/* ======================================================================== */
/* ================================= NOTES ================================ */
/* ======================================================================== */


/* ======================================================================== */
/* ================================ INCLUDES ============================== */
/* ======================================================================== */

#include "m68kops.h"
#include "m68kcpu.h"

/* ======================================================================== */
/* ================================= DATA ================================= */
/* ======================================================================== */

int  m68ki_initial_cycles;
int  m68ki_remaining_cycles = 0;                     /* Number of clocks remaining */
uint m68ki_tracing = 0;
uint m68ki_address_space;

#ifdef M68K_LOG_ENABLE
char* m68ki_cpu_names[9] =
{
	"Invalid CPU",
	"M68000",
	"M68010",
	"Invalid CPU",
	"M68EC020"
	"Invalid CPU",
	"Invalid CPU",
	"Invalid CPU",
	"M68020"
};
#endif /* M68K_LOG_ENABLE */

/* The CPU core */
m68ki_cpu_core m68ki_cpu = {0};

#if M68K_EMULATE_ADDRESS_ERROR
jmp_buf m68ki_address_error_trap;
#endif /* M68K_EMULATE_ADDRESS_ERROR */

/* Used by shift & rotate instructions */
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
};
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
};
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.
 */
uint8 m68ki_exception_cycle_table[3][256] =
{
	{ /* 000 */
		  4, /*  0: Reset - Initial Stack Pointer                      */
		  4, /*  1: Reset - Initial Program Counter                    */
		 50, /*  2: Bus Error                             (unemulated) */
		 50, /*  3: Address Error                         (unemulated) */
		 34, /*  4: Illegal Instruction                                */
		 38, /*  5: Divide by Zero -- ASG: changed from 42             */
		 40, /*  6: CHK -- ASG: chanaged from 44                       */
		 34, /*  7: TRAPV                                              */
		 34, /*  8: Privilege Violation                                */
		 34, /*  9: Trace                                              */
		  4, /* 10: 1010                                               */
		  4, /* 11: 1111                                               */
		  4, /* 12: RESERVED                                           */
		  4, /* 13: Coprocessor Protocol Violation        (unemulated) */
		  4, /* 14: Format Error                                       */
		 44, /* 15: Uninitialized Interrupt                            */
		  4, /* 16: RESERVED                                           */
		  4, /* 17: RESERVED                                           */
		  4, /* 18: RESERVED                                           */
		  4, /* 19: RESERVED                                           */
		  4, /* 20: RESERVED                                           */
		  4, /* 21: RESERVED                                           */
		  4, /* 22: RESERVED                                           */
		  4, /* 23: RESERVED                                           */
		 44, /* 24: Spurious Interrupt                                 */
		 44, /* 25: Level 1 Interrupt Autovector                       */
		 44, /* 26: Level 2 Interrupt Autovector                       */
		 44, /* 27: Level 3 Interrupt Autovector                       */
		 44, /* 28: Level 4 Interrupt Autovector                       */
		 44, /* 29: Level 5 Interrupt Autovector                       */
		 44, /* 30: Level 6 Interrupt Autovector                       */
		 44, /* 31: Level 7 Interrupt Autovector                       */
		 34, /* 32: TRAP #0 -- ASG: chanaged from 38                   */
		 34, /* 33: TRAP #1                                            */
		 34, /* 34: TRAP #2                                            */
		 34, /* 35: TRAP #3                                            */
		 34, /* 36: TRAP #4                                            */
		 34, /* 37: TRAP #5                                            */
		 34, /* 38: TRAP #6                                            */
		 34, /* 39: TRAP #7                                            */
		 34, /* 40: TRAP #8                                            */
		 34, /* 41: TRAP #9                                            */
		 34, /* 42: TRAP #10                                           */
		 34, /* 43: TRAP #11                                           */
		 34, /* 44: TRAP #12                                           */
		 34, /* 45: TRAP #13                                           */
		 34, /* 46: TRAP #14                                           */
		 34, /* 47: TRAP #15                                           */
		  4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
		  4, /* 49: FP Inexact Result                     (unemulated) */
		  4, /* 50: FP Divide by Zero                     (unemulated) */
		  4, /* 51: FP Underflow                          (unemulated) */
		  4, /* 52: FP Operand Error                      (unemulated) */
		  4, /* 53: FP Overflow                           (unemulated) */
		  4, /* 54: FP Signaling NAN                      (unemulated) */
		  4, /* 55: FP Unimplemented Data Type            (unemulated) */
		  4, /* 56: MMU Configuration Error               (unemulated) */
		  4, /* 57: MMU Illegal Operation Error           (unemulated) */
		  4, /* 58: MMU Access Level Violation Error      (unemulated) */
		  4, /* 59: RESERVED                                           */
		  4, /* 60: RESERVED                                           */
		  4, /* 61: RESERVED                                           */
		  4, /* 62: RESERVED                                           */
		  4, /* 63: RESERVED                                           */
		     /* 64-255: User Defined                                   */
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
	},
	{ /* 010 */
		  4, /*  0: Reset - Initial Stack Pointer                      */
		  4, /*  1: Reset - Initial Program Counter                    */
		126, /*  2: Bus Error                             (unemulated) */
		126, /*  3: Address Error                         (unemulated) */
		 38, /*  4: Illegal Instruction                                */
		 44, /*  5: Divide by Zero                                     */
		 44, /*  6: CHK                                                */
		 34, /*  7: TRAPV                                              */
		 38, /*  8: Privilege Violation                                */
		 38, /*  9: Trace                                              */
		  4, /* 10: 1010                                               */
		  4, /* 11: 1111                                               */
		  4, /* 12: RESERVED                                           */
		  4, /* 13: Coprocessor Protocol Violation        (unemulated) */
		  4, /* 14: Format Error                                       */
		 44, /* 15: Uninitialized Interrupt                            */
		  4, /* 16: RESERVED                                           */
		  4, /* 17: RESERVED                                           */
		  4, /* 18: RESERVED                                           */
		  4, /* 19: RESERVED                                           */
		  4, /* 20: RESERVED                                           */
		  4, /* 21: RESERVED                                           */
		  4, /* 22: RESERVED                                           */
		  4, /* 23: RESERVED                                           */
		 46, /* 24: Spurious Interrupt                                 */
		 46, /* 25: Level 1 Interrupt Autovector                       */
		 46, /* 26: Level 2 Interrupt Autovector                       */
		 46, /* 27: Level 3 Interrupt Autovector                       */
		 46, /* 28: Level 4 Interrupt Autovector                       */
		 46, /* 29: Level 5 Interrupt Autovector                       */
		 46, /* 30: Level 6 Interrupt Autovector                       */
		 46, /* 31: Level 7 Interrupt Autovector                       */
		 38, /* 32: TRAP #0                                            */
		 38, /* 33: TRAP #1                                            */
		 38, /* 34: TRAP #2                                            */
		 38, /* 35: TRAP #3                                            */
		 38, /* 36: TRAP #4                                            */
		 38, /* 37: TRAP #5                                            */
		 38, /* 38: TRAP #6                                            */
		 38, /* 39: TRAP #7                                            */
		 38, /* 40: TRAP #8                                            */
		 38, /* 41: TRAP #9                                            */
		 38, /* 42: TRAP #10                                           */
		 38, /* 43: TRAP #11                                           */
		 38, /* 44: TRAP #12                                           */
		 38, /* 45: TRAP #13                                           */
		 38, /* 46: TRAP #14                                           */
		 38, /* 47: TRAP #15                                           */
		  4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
		  4, /* 49: FP Inexact Result                     (unemulated) */
		  4, /* 50: FP Divide by Zero                     (unemulated) */
		  4, /* 51: FP Underflow                          (unemulated) */
		  4, /* 52: FP Operand Error                      (unemulated) */
		  4, /* 53: FP Overflow                           (unemulated) */
		  4, /* 54: FP Signaling NAN                      (unemulated) */
		  4, /* 55: FP Unimplemented Data Type            (unemulated) */
		  4, /* 56: MMU Configuration Error               (unemulated) */
		  4, /* 57: MMU Illegal Operation Error           (unemulated) */
		  4, /* 58: MMU Access Level Violation Error      (unemulated) */
		  4, /* 59: RESERVED                                           */
		  4, /* 60: RESERVED                                           */
		  4, /* 61: RESERVED                                           */
		  4, /* 62: RESERVED                                           */
		  4, /* 63: RESERVED                                           */
		     /* 64-255: User Defined                                   */
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
	},
	{ /* 020 */
		  4, /*  0: Reset - Initial Stack Pointer                      */
		  4, /*  1: Reset - Initial Program Counter                    */
		 50, /*  2: Bus Error                             (unemulated) */
		 50, /*  3: Address Error                         (unemulated) */
		 20, /*  4: Illegal Instruction                                */
		 38, /*  5: Divide by Zero                                     */
		 40, /*  6: CHK                                                */
		 20, /*  7: TRAPV                                              */
		 34, /*  8: Privilege Violation                                */
		 25, /*  9: Trace                                              */
		 20, /* 10: 1010                                               */
		 20, /* 11: 1111                                               */
		  4, /* 12: RESERVED                                           */
		  4, /* 13: Coprocessor Protocol Violation        (unemulated) */
		  4, /* 14: Format Error                                       */
		 30, /* 15: Uninitialized Interrupt                            */
		  4, /* 16: RESERVED                                           */
		  4, /* 17: RESERVED                                           */
		  4, /* 18: RESERVED                                           */
		  4, /* 19: RESERVED                                           */
		  4, /* 20: RESERVED                                           */
		  4, /* 21: RESERVED                                           */
		  4, /* 22: RESERVED                                           */
		  4, /* 23: RESERVED                                           */
		 30, /* 24: Spurious Interrupt                                 */
		 30, /* 25: Level 1 Interrupt Autovector                       */
		 30, /* 26: Level 2 Interrupt Autovector                       */
		 30, /* 27: Level 3 Interrupt Autovector                       */
		 30, /* 28: Level 4 Interrupt Autovector                       */
		 30, /* 29: Level 5 Interrupt Autovector                       */
		 30, /* 30: Level 6 Interrupt Autovector                       */
		 30, /* 31: Level 7 Interrupt Autovector                       */
		 20, /* 32: TRAP #0                                            */
		 20, /* 33: TRAP #1                                            */
		 20, /* 34: TRAP #2                                            */
		 20, /* 35: TRAP #3                                            */
		 20, /* 36: TRAP #4                                            */
		 20, /* 37: TRAP #5                                            */
		 20, /* 38: TRAP #6                                            */
		 20, /* 39: TRAP #7                                            */
		 20, /* 40: TRAP #8                                            */
		 20, /* 41: TRAP #9                                            */
		 20, /* 42: TRAP #10                                           */
		 20, /* 43: TRAP #11                                           */
		 20, /* 44: TRAP #12                                           */
		 20, /* 45: TRAP #13                                           */
		 20, /* 46: TRAP #14                                           */
		 20, /* 47: TRAP #15                                           */
		  4, /* 48: FP Branch or Set on Unknown Condition (unemulated) */
		  4, /* 49: FP Inexact Result                     (unemulated) */
		  4, /* 50: FP Divide by Zero                     (unemulated) */
		  4, /* 51: FP Underflow                          (unemulated) */
		  4, /* 52: FP Operand Error                      (unemulated) */
		  4, /* 53: FP Overflow                           (unemulated) */
		  4, /* 54: FP Signaling NAN                      (unemulated) */
		  4, /* 55: FP Unimplemented Data Type            (unemulated) */
		  4, /* 56: MMU Configuration Error               (unemulated) */
		  4, /* 57: MMU Illegal Operation Error           (unemulated) */
		  4, /* 58: MMU Access Level Violation Error      (unemulated) */
		  4, /* 59: RESERVED                                           */
		  4, /* 60: RESERVED                                           */
		  4, /* 61: RESERVED                                           */
		  4, /* 62: RESERVED                                           */
		  4, /* 63: RESERVED                                           */
		     /* 64-255: User Defined                                   */
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
		  4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4
	}
};

uint8 m68ki_ea_idx_cycle_table[64] =
{
	 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
	 0, /* ..01.000 no memory indirect, base NULL             */
	 5, /* ..01..01 memory indirect,    base NULL, outer NULL */
	 7, /* ..01..10 memory indirect,    base NULL, outer 16   */
	 7, /* ..01..11 memory indirect,    base NULL, outer 32   */
	 0,  5,  7,  7,  0,  5,  7,  7,  0,  5,  7,  7,
	 2, /* ..10.000 no memory indirect, base 16               */
	 7, /* ..10..01 memory indirect,    base 16,   outer NULL */
	 9, /* ..10..10 memory indirect,    base 16,   outer 16   */
	 9, /* ..10..11 memory indirect,    base 16,   outer 32   */
	 0,  7,  9,  9,  0,  7,  9,  9,  0,  7,  9,  9,
	 6, /* ..11.000 no memory indirect, base 32               */
	11, /* ..11..01 memory indirect,    base 32,   outer NULL */
	13, /* ..11..10 memory indirect,    base 32,   outer 16   */
	13, /* ..11..11 memory indirect,    base 32,   outer 32   */
	 0, 11, 13, 13,  0, 11, 13, 13,  0, 11, 13, 13
};


/* ======================================================================== */
/* =============================== CALLBACKS ============================== */
/* ======================================================================== */

/* Default callbacks used if the callback hasn't been set yet, or if the
 * callback is set to NULL
 */

/* Interrupt acknowledge */
static int default_int_ack_callback_data;
static int default_int_ack_callback(int int_level)
{
	default_int_ack_callback_data = int_level;
	CPU_INT_LEVEL = 0;
	return M68K_INT_ACK_AUTOVECTOR;
}

/* Breakpoint acknowledge */
static unsigned int default_bkpt_ack_callback_data;
static void default_bkpt_ack_callback(unsigned int data)
{
	default_bkpt_ack_callback_data = data;
}

/* Called when a reset instruction is executed */
static void default_reset_instr_callback(void)
{
}

/* Called when the program counter changed by a large value */
static unsigned int default_pc_changed_callback_data;
static void default_pc_changed_callback(unsigned int new_pc)
{
	default_pc_changed_callback_data = new_pc;
}

/* Called every time there's bus activity (read/write to/from memory */
static unsigned int default_set_fc_callback_data;
static void default_set_fc_callback(unsigned int new_fc)
{
	default_set_fc_callback_data = new_fc;
}

/* Called every instruction cycle prior to execution */
static void default_instr_hook_callback(void)
{
}


/* ======================================================================== */
/* ================================= API ================================== */
/* ======================================================================== */

/* Access the internals of the CPU */
unsigned int m68k_get_reg(void* context, m68k_register_t regnum)
{
	m68ki_cpu_core* cpu = context != NULL ?(m68ki_cpu_core*)context : &m68ki_cpu;

	switch(regnum)
	{
		case M68K_REG_D0:	return cpu->dar[0];
		case M68K_REG_D1:	return cpu->dar[1];
		case M68K_REG_D2:	return cpu->dar[2];
		case M68K_REG_D3:	return cpu->dar[3];
		case M68K_REG_D4:	return cpu->dar[4];
		case M68K_REG_D5:	return cpu->dar[5];
		case M68K_REG_D6:	return cpu->dar[6];
		case M68K_REG_D7:	return cpu->dar[7];
		case M68K_REG_A0:	return cpu->dar[8];
		case M68K_REG_A1:	return cpu->dar[9];
		case M68K_REG_A2:	return cpu->dar[10];
		case M68K_REG_A3:	return cpu->dar[11];
		case M68K_REG_A4:	return cpu->dar[12];
		case M68K_REG_A5:	return cpu->dar[13];
		case M68K_REG_A6:	return cpu->dar[14];
		case M68K_REG_A7:	return cpu->dar[15];
		case M68K_REG_PC:	return MASK_OUT_ABOVE_32(cpu->pc);
		case M68K_REG_SR:	return	cpu->t1_flag						|
									cpu->t0_flag						|
									(cpu->s_flag << 11)					|
									(cpu->m_flag << 11)					|
									cpu->int_mask						|
									((cpu->x_flag & XFLAG_SET) >> 4)	|
									((cpu->n_flag & NFLAG_SET) >> 4)	|
									((!cpu->not_z_flag) << 2)			|
									((cpu->v_flag & VFLAG_SET) >> 6)	|
									((cpu->c_flag & CFLAG_SET) >> 8);
		case M68K_REG_SP:	return cpu->dar[15];
		case M68K_REG_USP:	return cpu->s_flag ? cpu->sp[0] : cpu->dar[15];
		case M68K_REG_ISP:	return cpu->s_flag && !cpu->m_flag ? cpu->dar[15] : cpu->sp[4];
		case M68K_REG_MSP:	return cpu->s_flag && cpu->m_flag ? cpu->dar[15] : cpu->sp[6];
		case M68K_REG_SFC:	return cpu->sfc;
		case M68K_REG_DFC:	return cpu->dfc;
		case M68K_REG_VBR:	return cpu->vbr;
		case M68K_REG_CACR:	return cpu->cacr;
		case M68K_REG_CAAR:	return cpu->caar;
		case M68K_REG_PREF_ADDR:	return cpu->pref_addr;
		case M68K_REG_PREF_DATA:	return cpu->pref_data;
		case M68K_REG_PPC:	return MASK_OUT_ABOVE_32(cpu->ppc);
		case M68K_REG_IR:	return cpu->ir;
		case M68K_REG_CPU_TYPE:
			switch(cpu->cpu_type)
			{
				case CPU_TYPE_000:		return (unsigned int)M68K_CPU_TYPE_68000;
				case CPU_TYPE_010:		return (unsigned int)M68K_CPU_TYPE_68010;
				case CPU_TYPE_EC020:	return (unsigned int)M68K_CPU_TYPE_68EC020;
				case CPU_TYPE_020:		return (unsigned int)M68K_CPU_TYPE_68020;
			}
			return M68K_CPU_TYPE_INVALID;
		default:			return 0;
	}
	return 0;
}

void m68k_set_reg(m68k_register_t regnum, unsigned int value)
{
	switch(regnum)
	{
		case M68K_REG_D0:	REG_D[0] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D1:	REG_D[1] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D2:	REG_D[2] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D3:	REG_D[3] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D4:	REG_D[4] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D5:	REG_D[5] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D6:	REG_D[6] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_D7:	REG_D[7] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A0:	REG_A[0] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A1:	REG_A[1] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A2:	REG_A[2] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A3:	REG_A[3] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A4:	REG_A[4] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A5:	REG_A[5] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A6:	REG_A[6] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_A7:	REG_A[7] = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_PC:	m68ki_jump(MASK_OUT_ABOVE_32(value)); return;
		case M68K_REG_SR:	m68ki_set_sr(value); return;
		case M68K_REG_SP:	REG_SP = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_USP:	if(FLAG_S)
								REG_USP = MASK_OUT_ABOVE_32(value);
							else
								REG_SP = MASK_OUT_ABOVE_32(value);
							return;
		case M68K_REG_ISP:	if(FLAG_S && !FLAG_M)
								REG_SP = MASK_OUT_ABOVE_32(value);
							else
								REG_ISP = MASK_OUT_ABOVE_32(value);
							return;
		case M68K_REG_MSP:	if(FLAG_S && FLAG_M)
								REG_SP = MASK_OUT_ABOVE_32(value);
							else
								REG_MSP = MASK_OUT_ABOVE_32(value);
							return;
		case M68K_REG_VBR:	REG_VBR = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_SFC:	REG_SFC = value & 7; return;
		case M68K_REG_DFC:	REG_DFC = value & 7; return;
		case M68K_REG_CACR:	REG_CACR = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_CAAR:	REG_CAAR = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_PPC:	REG_PPC = MASK_OUT_ABOVE_32(value); return;
		case M68K_REG_IR:	REG_IR = MASK_OUT_ABOVE_16(value); return;
		case M68K_REG_CPU_TYPE: m68k_set_cpu_type(value); return;
		default:			return;
	}
}

/* Set the callbacks */
void m68k_set_int_ack_callback(int  (*callback)(int int_level))
{
	CALLBACK_INT_ACK = callback ? callback : default_int_ack_callback;
}

void m68k_set_bkpt_ack_callback(void  (*callback)(unsigned int data))
{
	CALLBACK_BKPT_ACK = callback ? callback : default_bkpt_ack_callback;
}

void m68k_set_reset_instr_callback(void  (*callback)(void))
{
	CALLBACK_RESET_INSTR = callback ? callback : default_reset_instr_callback;
}

void m68k_set_pc_changed_callback(void  (*callback)(unsigned int new_pc))
{
	CALLBACK_PC_CHANGED = callback ? callback : default_pc_changed_callback;
}

void m68k_set_fc_callback(void  (*callback)(unsigned int new_fc))
{
	CALLBACK_SET_FC = callback ? callback : default_set_fc_callback;
}

void m68k_set_instr_hook_callback(void  (*callback)(void))
{
	CALLBACK_INSTR_HOOK = callback ? callback : default_instr_hook_callback;
}

#include <stdio.h>
/* Set the CPU type. */
void m68k_set_cpu_type(unsigned int cpu_type)
{
	switch(cpu_type)
	{
		case M68K_CPU_TYPE_68000:
			CPU_TYPE         = CPU_TYPE_000;
			CPU_ADDRESS_MASK = 0x00ffffff;
			CPU_SR_MASK      = 0xa71f; /* T1 -- S  -- -- I2 I1 I0 -- -- -- X  N  Z  V  C  */
			CYC_INSTRUCTION  = m68ki_cycles[0];
			CYC_EXCEPTION    = m68ki_exception_cycle_table[0];
			CYC_BCC_NOTAKE_B = -2;
			CYC_BCC_NOTAKE_W = 2;
			CYC_DBCC_F_NOEXP = -2;
			CYC_DBCC_F_EXP   = 2;
			CYC_SCC_R_FALSE  = 2;
			CYC_MOVEM_W      = 2;
			CYC_MOVEM_L      = 3;
			CYC_SHIFT        = 1;
			CYC_RESET        = 132;
			return;
		case M68K_CPU_TYPE_68010:
			CPU_TYPE         = CPU_TYPE_010;
			CPU_ADDRESS_MASK = 0x00ffffff;
			CPU_SR_MASK      = 0xa71f; /* T1 -- S  -- -- I2 I1 I0 -- -- -- X  N  Z  V  C  */
			CYC_INSTRUCTION  = m68ki_cycles[1];
			CYC_EXCEPTION    = m68ki_exception_cycle_table[1];
			CYC_BCC_NOTAKE_B = -4;
			CYC_BCC_NOTAKE_W = 0;
			CYC_DBCC_F_NOEXP = 0;
			CYC_DBCC_F_EXP   = 6;
			CYC_SCC_R_FALSE  = 0;
			CYC_MOVEM_W      = 2;
			CYC_MOVEM_L      = 3;
			CYC_SHIFT        = 1;
			CYC_RESET        = 130;
			return;
		case M68K_CPU_TYPE_68EC020:
			CPU_TYPE         = CPU_TYPE_EC020;
			CPU_ADDRESS_MASK = 0x00ffffff;
			CPU_SR_MASK      = 0xf71f; /* T1 T0 S  M  -- I2 I1 I0 -- -- -- X  N  Z  V  C  */
			CYC_INSTRUCTION  = m68ki_cycles[2];
			CYC_EXCEPTION    = m68ki_exception_cycle_table[2];
			CYC_BCC_NOTAKE_B = -2;
			CYC_BCC_NOTAKE_W = 0;
			CYC_DBCC_F_NOEXP = 0;
			CYC_DBCC_F_EXP   = 4;
			CYC_SCC_R_FALSE  = 0;
			CYC_MOVEM_W      = 2;
			CYC_MOVEM_L      = 2; 
			CYC_SHIFT        = 0;
			CYC_RESET        = 518;
			return;
		case M68K_CPU_TYPE_68020:
			CPU_TYPE         = CPU_TYPE_020;
			CPU_ADDRESS_MASK = 0xffffffff;
			CPU_SR_MASK      = 0xf71f; /* T1 T0 S  M  -- I2 I1 I0 -- -- -- X  N  Z  V  C  */
			CYC_INSTRUCTION  = m68ki_cycles[2];
			CYC_EXCEPTION    = m68ki_exception_cycle_table[2];
			CYC_BCC_NOTAKE_B = -2;
			CYC_BCC_NOTAKE_W = 0;
			CYC_DBCC_F_NOEXP = 0;
			CYC_DBCC_F_EXP   = 4;
			CYC_SCC_R_FALSE  = 0;
			CYC_MOVEM_W      = 2;
			CYC_MOVEM_L      = 2;
			CYC_SHIFT        = 0;
			CYC_RESET        = 518;
			return;
	}
}

/* Execute some instructions until we use up num_cycles clock cycles */
/* ASG: removed per-instruction interrupt checks */
int m68k_execute(int num_cycles)
{
	/* Make sure we're not stopped */
	if(!CPU_STOPPED)
	{
		/* Set our pool of clock cycles available */
		SET_CYCLES(num_cycles);
		m68ki_initial_cycles = num_cycles;

		/* ASG: update cycles */
		USE_CYCLES(CPU_INT_CYCLES);
		CPU_INT_CYCLES = 0;

		/* Return point if we had an address error */
		m68ki_set_address_error_trap(); /* auto-disable (see m68kcpu.h) */

		/* Main loop.  Keep going until we run out of clock cycles */
		do
		{
			/* Set tracing accodring to T1. (T0 is done inside instruction) */
			m68ki_trace_t1(); /* auto-disable (see m68kcpu.h) */

			/* Set the address space for reads */
			m68ki_use_data_space(); /* auto-disable (see m68kcpu.h) */

			/* Call external hook to peek at CPU */
			m68ki_instr_hook(); /* auto-disable (see m68kcpu.h) */

			/* Record previous program counter */
			REG_PPC = REG_PC;

			/* Read an instruction and call its handler */
			REG_IR = m68ki_read_imm_16();
			m68ki_instruction_jump_table[REG_IR]();
			USE_CYCLES(CYC_INSTRUCTION[REG_IR]);

			/* Trace m68k_exception, if necessary */
			m68ki_exception_if_trace(); /* auto-disable (see m68kcpu.h) */
		} while(GET_CYCLES() > 0);

		/* set previous PC to current PC for the next entry into the loop */
		REG_PPC = REG_PC;

		/* ASG: update cycles */
		USE_CYCLES(CPU_INT_CYCLES);
		CPU_INT_CYCLES = 0;

		/* return how many clocks we used */
		return m68ki_initial_cycles - GET_CYCLES();
	}

	/* We get here if the CPU is stopped or halted */
	SET_CYCLES(0);
	CPU_INT_CYCLES = 0;

	return num_cycles;
}


int m68k_cycles_run(void)
{
	return m68ki_initial_cycles - GET_CYCLES();
}

int m68k_cycles_remaining(void)
{
	return GET_CYCLES();
}

/* Change the timeslice */
void m68k_modify_timeslice(int cycles)
{
	m68ki_initial_cycles += cycles;
	ADD_CYCLES(cycles);
}


void m68k_end_timeslice(void)
{
	m68ki_initial_cycles = GET_CYCLES();
	SET_CYCLES(0);
}


/* ASG: rewrote so that the int_level is a mask of the IPL0/IPL1/IPL2 bits */
/* KS: Modified so that IPL* bits match with mask positions in the SR
 *     and cleaned out remenants of the interrupt controller.
 */
void m68k_set_irq(unsigned int int_level)
{
	uint old_level = CPU_INT_LEVEL;
	CPU_INT_LEVEL = int_level << 8;

	/* A transition from < 7 to 7 always interrupts (NMI) */
	/* Note: Level 7 can also level trigger like a normal IRQ */
	if(old_level != 0x0700 && CPU_INT_LEVEL == 0x0700)
		m68ki_exception_interrupt(7); /* Edge triggered level 7 (NMI) */
	else
		m68ki_check_interrupts(); /* Level triggered (IRQ) */
}


/* Trigger a Bus Error exception */
void m68k_pulse_bus_error(void)
{
	m68ki_exception_bus_error();
}


/* Pulse the RESET line on the CPU */
void m68k_pulse_reset(void)
{
	static uint emulation_initialized = 0;

	/* The first call to this function initializes the opcode handler jump table */
	if(!emulation_initialized)
	{
		m68ki_build_opcode_table();
		m68k_set_int_ack_callback(NULL);
		m68k_set_bkpt_ack_callback(NULL);
		m68k_set_reset_instr_callback(NULL);
		m68k_set_pc_changed_callback(NULL);
		m68k_set_fc_callback(NULL);
		m68k_set_instr_hook_callback(NULL);

		emulation_initialized = 1;
	}


	if(CPU_TYPE == 0)	/* KW 990319 */
		m68k_set_cpu_type(M68K_CPU_TYPE_68000);

	/* Clear all stop levels and eat up all remaining cycles */
	CPU_STOPPED = 0;
	SET_CYCLES(0);

	/* Turn off tracing */
	FLAG_T1 = FLAG_T0 = 0;
	m68ki_clear_trace();
	/* Interrupt mask to level 7 */
	FLAG_INT_MASK = 0x0700;
	/* Reset VBR */
	REG_VBR = 0;
	/* Go to supervisor mode */
	m68ki_set_sm_flag(SFLAG_SET | MFLAG_CLEAR);

	/* Invalidate the prefetch queue */
#if M68K_EMULATE_PREFETCH
	/* Set to arbitrary number since our first fetch is from 0 */
	CPU_PREF_ADDR = 0x1000;
#endif /* M68K_EMULATE_PREFETCH */

	/* Read the initial stack pointer and program counter */
	m68ki_jump(0);
	REG_SP = m68ki_read_imm_32();
	REG_PC = m68ki_read_imm_32();
	m68ki_jump(REG_PC);
}

/* Pulse the HALT line on the CPU */
void m68k_pulse_halt(void)
{
	CPU_STOPPED |= STOP_LEVEL_HALT;
}


/* Get and set the current CPU context */
/* This is to allow for multiple CPUs */
unsigned int m68k_context_size()
{
	return sizeof(m68ki_cpu_core);
}

unsigned int m68k_get_context(void* dst)
{
	if(dst) *(m68ki_cpu_core*)dst = m68ki_cpu;
	return sizeof(m68ki_cpu_core);
}

void m68k_set_context(void* src)
{
	if(src) m68ki_cpu = *(m68ki_cpu_core*)src;
}

void m68k_save_context(	void (*save_value)(char*, unsigned int))
{
	if(!save_value)
		return;

	save_value("CPU_TYPE"  , m68k_get_reg(NULL, M68K_REG_CPU_TYPE));
	save_value("D0"        , REG_D[0]);
	save_value("D1"        , REG_D[1]);
	save_value("D2"        , REG_D[2]);
	save_value("D3"        , REG_D[3]);
	save_value("D4"        , REG_D[4]);
	save_value("D5"        , REG_D[5]);
	save_value("D6"        , REG_D[6]);
	save_value("D7"        , REG_D[7]);
	save_value("A0"        , REG_A[0]);
	save_value("A1"        , REG_A[1]);
	save_value("A2"        , REG_A[2]);
	save_value("A3"        , REG_A[3]);
	save_value("A4"        , REG_A[4]);
	save_value("A5"        , REG_A[5]);
	save_value("A6"        , REG_A[6]);
	save_value("A7"        , REG_A[7]);
	save_value("PPC"       , REG_PPC);
	save_value("PC"        , REG_PC);
	save_value("USP"       , REG_USP);
	save_value("ISP"       , REG_ISP);
	save_value("MSP"       , REG_MSP);
	save_value("VBR"       , REG_VBR);
	save_value("SFC"       , REG_SFC);
	save_value("DFC"       , REG_DFC);
	save_value("CACR"      , REG_CACR);
	save_value("CAAR"      , REG_CAAR);
	save_value("SR"        , m68ki_get_sr());
	save_value("INT_LEVEL" , CPU_INT_LEVEL);
	save_value("INT_CYCLES", CPU_INT_CYCLES);
	save_value("STOPPED"   , (CPU_STOPPED & STOP_LEVEL_STOP) != 0);
	save_value("HALTED"    , (CPU_STOPPED & STOP_LEVEL_HALT) != 0);
	save_value("PREF_ADDR" , CPU_PREF_ADDR);
	save_value("PREF_DATA" , CPU_PREF_DATA);
}

void m68k_load_context(unsigned int (*load_value)(char*))
{
	unsigned int temp;

	m68k_set_cpu_type(load_value("CPU_TYPE"));
	REG_PPC = load_value("PPC");
	REG_PC = load_value("PC");
	m68ki_jump(REG_PC);
	CPU_INT_LEVEL = 0;
	m68ki_set_sr_noint(load_value("SR"));
	REG_D[0]       = load_value("D0");
	REG_D[1]       = load_value("D1");
	REG_D[2]       = load_value("D2");
	REG_D[3]       = load_value("D3");
	REG_D[4]       = load_value("D4");
	REG_D[5]       = load_value("D5");
	REG_D[6]       = load_value("D6");
	REG_D[7]       = load_value("D7");
	REG_A[0]       = load_value("A0");
	REG_A[1]       = load_value("A1");
	REG_A[2]       = load_value("A2");
	REG_A[3]       = load_value("A3");
	REG_A[4]       = load_value("A4");
	REG_A[5]       = load_value("A5");
	REG_A[6]       = load_value("A6");
	REG_A[7]       = load_value("A7");
	REG_USP        = load_value("USP");
	REG_ISP        = load_value("ISP");
	REG_MSP        = load_value("MSP");
	REG_VBR        = load_value("VBR");
	REG_SFC        = load_value("SFC");
	REG_DFC        = load_value("DFC");
	REG_CACR       = load_value("CACR");
	REG_CAAR       = load_value("CAAR");
	CPU_INT_LEVEL  = load_value("INT_LEVEL");
	CPU_INT_CYCLES = load_value("INT_CYCLES");

	CPU_STOPPED = 0;
	temp           = load_value("STOPPED");
	if(temp) CPU_STOPPED |= STOP_LEVEL_STOP;
	temp           = load_value("HALTED");
	if(temp) CPU_STOPPED |= STOP_LEVEL_HALT;

	CPU_PREF_ADDR  = load_value("PREF_ADDR");
	CPU_PREF_DATA  = load_value("PREF_DATA");
}


/* ======================================================================== */
/* ============================== END OF FILE ============================= */
/* ======================================================================== */