src/uae_cpu/newcpu.cpp

 /*
  * UAE - The Un*x Amiga Emulator
  *
  * MC68000 emulation
  *
  * (c) 1995 Bernd Schmidt
  */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "sysdeps.h"

#include "cpu_emulation.h"
#include "main.h"
#include "emul_op.h"

extern int intlev(void);        // From baisilisk_glue.cpp

#include "m68k.h"
#include "memory.h"
#include "readcpu.h"
#include "newcpu.h"
#include "compiler/compemu.h"
#include "fpu/fpu.h"

#if defined(ENABLE_EXCLUSIVE_SPCFLAGS) && !defined(HAVE_HARDWARE_LOCKS)
B2_mutex *spcflags_lock = NULL;
#endif

#if ENABLE_MON
#include "mon.h"
#include "mon_disass.h"
#endif

bool quit_program = false;
struct flag_struct regflags;

/* Opcode of faulting instruction */
uae_u16 last_op_for_exception_3;
/* PC at fault time */
uaecptr last_addr_for_exception_3;
/* Address that generated the exception */
uaecptr last_fault_for_exception_3;

int areg_byteinc[] = { 1,1,1,1,1,1,1,2 };
int imm8_table[] = { 8,1,2,3,4,5,6,7 };

int movem_index1[256];
int movem_index2[256];
int movem_next[256];

cpuop_func *cpufunctbl[65536];

#if FLIGHT_RECORDER
struct rec_step {
        uae_u32 d[8];
        uae_u32 a[8];
        uae_u32 pc;
};

const int LOG_SIZE = 8192;
static rec_step log[LOG_SIZE];
static int log_ptr = -1; // First time initialization

static const char *log_filename(void)
{
        const char *name = getenv("M68K_LOG_FILE");
        return name ? name : "log.68k";
}

void m68k_record_step(uaecptr pc)
{
        for (int i = 0; i < 8; i++) {
                log[log_ptr].d[i] = m68k_dreg(regs, i);
                log[log_ptr].a[i] = m68k_areg(regs, i);
        }
        log[log_ptr].pc = pc;
        log_ptr = (log_ptr + 1) % LOG_SIZE;
}

static void dump_log(void)
{
        FILE *f = fopen(log_filename(), "w");
        if (f == NULL)
                return;
        for (int i = 0; i < LOG_SIZE; i++) {
                int j = (i + log_ptr) % LOG_SIZE;
                fprintf(f, "pc %08x\n", log[j].pc);
                fprintf(f, "d0 %08x d1 %08x d2 %08x d3 %08x\n", log[j].d[0], log[j].d[1], log[j].d[2], log[j].d[3]);
                fprintf(f, "d4 %08x d5 %08x d6 %08x d7 %08x\n", log[j].d[4], log[j].d[5], log[j].d[6], log[j].d[7]);
                fprintf(f, "a0 %08x a1 %08x a2 %08x a3 %08x\n", log[j].a[0], log[j].a[1], log[j].a[2], log[j].a[3]);
                fprintf(f, "a4 %08x a5 %08x a6 %08x a7 %08x\n", log[j].a[4], log[j].a[5], log[j].a[6], log[j].a[7]);
#if ENABLE_MON
                disass_68k(f, log[j].pc);
#endif
        }
        fclose(f);
}
#endif

#define COUNT_INSTRS 0

#if COUNT_INSTRS
static unsigned long int instrcount[65536];
static uae_u16 opcodenums[65536];

static int compfn (const void *el1, const void *el2)
{
    return instrcount[*(const uae_u16 *)el1] < instrcount[*(const uae_u16 *)el2];
}

static char *icountfilename (void)
{
    char *name = getenv ("INSNCOUNT");
    if (name)
        return name;
    return COUNT_INSTRS == 2 ? "frequent.68k" : "insncount";
}

void dump_counts (void)
{
    FILE *f = fopen (icountfilename (), "w");
    unsigned long int total;
    int i;

    write_log ("Writing instruction count file...\n");
    for (i = 0; i < 65536; i++) {
        opcodenums[i] = i;
        total += instrcount[i];
    }
    qsort (opcodenums, 65536, sizeof(uae_u16), compfn);

    fprintf (f, "Total: %lu\n", total);
    for (i=0; i < 65536; i++) {
        unsigned long int cnt = instrcount[opcodenums[i]];
        struct instr *dp;
        struct mnemolookup *lookup;
        if (!cnt)
            break;
        dp = table68k + opcodenums[i];
        for (lookup = lookuptab;lookup->mnemo != dp->mnemo; lookup++)
            ;
        fprintf (f, "%04x: %lu %s\n", opcodenums[i], cnt, lookup->name);
    }
    fclose (f);
}
#else
void dump_counts (void)
{
}
#endif

int broken_in;

static __inline__ unsigned int cft_map (unsigned int f)
{
#ifndef HAVE_GET_WORD_UNSWAPPED
    return f;
#else
    return ((f >> 8) & 255) | ((f & 255) << 8);
#endif
}

cpuop_rettype REGPARAM2 op_illg_1 (uae_u32 opcode) REGPARAM;

cpuop_rettype REGPARAM2 op_illg_1 (uae_u32 opcode)
{
    cpuop_return( op_illg (cft_map (opcode)) );
}

static void build_cpufunctbl (void)
{
    int i;
    unsigned long opcode;
        int cpu_level = 0;              // 68000 (default)
        if (CPUType == 4)
                cpu_level = 4;          // 68040 with FPU
        else {
                if (FPUType)
                        cpu_level = 3;  // 68020 with FPU
                else if (CPUType >= 2)
                        cpu_level = 2;  // 68020
                else if (CPUType == 1)
                        cpu_level = 1;
        }
    struct cputbl *tbl = (
                  cpu_level == 4 ? op_smalltbl_0_ff
                : cpu_level == 3 ? op_smalltbl_1_ff
                : cpu_level == 2 ? op_smalltbl_2_ff
                : cpu_level == 1 ? op_smalltbl_3_ff
                : op_smalltbl_4_ff);

    for (opcode = 0; opcode < 65536; opcode++)
        cpufunctbl[cft_map (opcode)] = op_illg_1;
    for (i = 0; tbl[i].handler != NULL; i++) {
        if (! tbl[i].specific)
            cpufunctbl[cft_map (tbl[i].opcode)] = tbl[i].handler;
    }
    for (opcode = 0; opcode < 65536; opcode++) {
        cpuop_func *f;

        if (table68k[opcode].mnemo == i_ILLG || table68k[opcode].clev > cpu_level)
            continue;

        if (table68k[opcode].handler != -1) {
            f = cpufunctbl[cft_map (table68k[opcode].handler)];
            if (f == op_illg_1)
                abort();
            cpufunctbl[cft_map (opcode)] = f;
        }
    }
    for (i = 0; tbl[i].handler != NULL; i++) {
        if (tbl[i].specific)
            cpufunctbl[cft_map (tbl[i].opcode)] = tbl[i].handler;
    }
}

void init_m68k (void)
{
    int i;

    for (i = 0 ; i < 256 ; i++) {
        int j;
        for (j = 0 ; j < 8 ; j++) {
                if (i & (1 << j)) break;
        }
        movem_index1[i] = j;
        movem_index2[i] = 7-j;
        movem_next[i] = i & (~(1 << j));
    }
#if COUNT_INSTRS
    {
        FILE *f = fopen (icountfilename (), "r");
        memset (instrcount, 0, sizeof instrcount);
        if (f) {
            uae_u32 opcode, count, total;
            char name[20];
            write_log ("Reading instruction count file...\n");
            fscanf (f, "Total: %lu\n", &total);
            while (fscanf (f, "%lx: %lu %s\n", &opcode, &count, name) == 3) {
                instrcount[opcode] = count;
            }
            fclose(f);
        }
    }
#endif
    read_table68k ();
    do_merges ();

    build_cpufunctbl ();
        
#if defined(ENABLE_EXCLUSIVE_SPCFLAGS) && !defined(HAVE_HARDWARE_LOCKS)
        spcflags_lock = B2_create_mutex();
#endif
    fpu_init(CPUType == 4);
}

void exit_m68k (void)
{
        fpu_exit ();
#if defined(ENABLE_EXCLUSIVE_SPCFLAGS) && !defined(HAVE_HARDWARE_LOCKS)
        B2_delete_mutex(spcflags_lock);
#endif
}

struct regstruct regs, lastint_regs;
static struct regstruct regs_backup[16];
static int backup_pointer = 0;
static long int m68kpc_offset;
int lastint_no;

#if REAL_ADDRESSING || DIRECT_ADDRESSING
#define get_ibyte_1(o) get_byte(get_virtual_address(regs.pc_p) + (o) + 1)
#define get_iword_1(o) get_word(get_virtual_address(regs.pc_p) + (o))
#define get_ilong_1(o) get_long(get_virtual_address(regs.pc_p) + (o))
#else
#define get_ibyte_1(o) get_byte(regs.pc + (regs.pc_p - regs.pc_oldp) + (o) + 1)
#define get_iword_1(o) get_word(regs.pc + (regs.pc_p - regs.pc_oldp) + (o))
#define get_ilong_1(o) get_long(regs.pc + (regs.pc_p - regs.pc_oldp) + (o))
#endif

uae_s32 ShowEA (int reg, amodes mode, wordsizes size, char *buf)
{
    uae_u16 dp;
    uae_s8 disp8;
    uae_s16 disp16;
    int r;
    uae_u32 dispreg;
    uaecptr addr;
    uae_s32 offset = 0;
    char buffer[80];

    switch (mode){
     case Dreg:
        sprintf (buffer,"D%d", reg);
        break;
     case Areg:
        sprintf (buffer,"A%d", reg);
        break;
     case Aind:
        sprintf (buffer,"(A%d)", reg);
        break;
     case Aipi:
        sprintf (buffer,"(A%d)+", reg);
        break;
     case Apdi:
        sprintf (buffer,"-(A%d)", reg);
        break;
     case Ad16:
        disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        addr = m68k_areg(regs,reg) + (uae_s16)disp16;
        sprintf (buffer,"(A%d,$%04x) == $%08lx", reg, disp16 & 0xffff,
                                        (unsigned long)addr);
        break;
     case Ad8r:
        dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        disp8 = dp & 0xFF;
        r = (dp & 0x7000) >> 12;
        dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
        if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
        dispreg <<= (dp >> 9) & 3;

        if (dp & 0x100) {
            uae_s32 outer = 0, disp = 0;
            uae_s32 base = m68k_areg(regs,reg);
            char name[10];
            sprintf (name,"A%d, ",reg);
            if (dp & 0x80) { base = 0; name[0] = 0; }
            if (dp & 0x40) dispreg = 0;
            if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
            base += disp;

            if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }

            if (!(dp & 4)) base += dispreg;
            if (dp & 3) base = get_long (base);
            if (dp & 4) base += dispreg;

            addr = base + outer;
            sprintf (buffer,"(%s%c%d.%c*%d+%ld)+%ld == $%08lx", name,
                    dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
                    1 << ((dp >> 9) & 3),
                    disp,outer,
                    (unsigned long)addr);
        } else {
          addr = m68k_areg(regs,reg) + (uae_s32)((uae_s8)disp8) + dispreg;
          sprintf (buffer,"(A%d, %c%d.%c*%d, $%02x) == $%08lx", reg,
               dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
               1 << ((dp >> 9) & 3), disp8,
               (unsigned long)addr);
        }
        break;
     case PC16:
        addr = m68k_getpc () + m68kpc_offset;
        disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        addr += (uae_s16)disp16;
        sprintf (buffer,"(PC,$%04x) == $%08lx", disp16 & 0xffff,(unsigned long)addr);
        break;
     case PC8r:
        addr = m68k_getpc () + m68kpc_offset;
        dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        disp8 = dp & 0xFF;
        r = (dp & 0x7000) >> 12;
        dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
        if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
        dispreg <<= (dp >> 9) & 3;

        if (dp & 0x100) {
            uae_s32 outer = 0,disp = 0;
            uae_s32 base = addr;
            char name[10];
            sprintf (name,"PC, ");
            if (dp & 0x80) { base = 0; name[0] = 0; }
            if (dp & 0x40) dispreg = 0;
            if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
            base += disp;

            if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }

            if (!(dp & 4)) base += dispreg;
            if (dp & 3) base = get_long (base);
            if (dp & 4) base += dispreg;

            addr = base + outer;
            sprintf (buffer,"(%s%c%d.%c*%d+%ld)+%ld == $%08lx", name,
                    dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
                    1 << ((dp >> 9) & 3),
                    disp,outer,
                    (unsigned long)addr);
        } else {
          addr += (uae_s32)((uae_s8)disp8) + dispreg;
          sprintf (buffer,"(PC, %c%d.%c*%d, $%02x) == $%08lx", dp & 0x8000 ? 'A' : 'D',
                (int)r, dp & 0x800 ? 'L' : 'W',  1 << ((dp >> 9) & 3),
                disp8, (unsigned long)addr);
        }
        break;
     case absw:
        sprintf (buffer,"$%08lx", (unsigned long)(uae_s32)(uae_s16)get_iword_1 (m68kpc_offset));
        m68kpc_offset += 2;
        break;
     case absl:
        sprintf (buffer,"$%08lx", (unsigned long)get_ilong_1 (m68kpc_offset));
        m68kpc_offset += 4;
        break;
     case imm:
        switch (size){
         case sz_byte:
            sprintf (buffer,"#$%02x", (unsigned int)(get_iword_1 (m68kpc_offset) & 0xff));
            m68kpc_offset += 2;
            break;
         case sz_word:
            sprintf (buffer,"#$%04x", (unsigned int)(get_iword_1 (m68kpc_offset) & 0xffff));
            m68kpc_offset += 2;
            break;
         case sz_long:
            sprintf (buffer,"#$%08lx", (unsigned long)(get_ilong_1 (m68kpc_offset)));
            m68kpc_offset += 4;
            break;
         default:
            break;
        }
        break;
     case imm0:
        offset = (uae_s32)(uae_s8)get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        sprintf (buffer,"#$%02x", (unsigned int)(offset & 0xff));
        break;
     case imm1:
        offset = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        sprintf (buffer,"#$%04x", (unsigned int)(offset & 0xffff));
        break;
     case imm2:
        offset = (uae_s32)get_ilong_1 (m68kpc_offset);
        m68kpc_offset += 4;
        sprintf (buffer,"#$%08lx", (unsigned long)offset);
        break;
     case immi:
        offset = (uae_s32)(uae_s8)(reg & 0xff);
        sprintf (buffer,"#$%08lx", (unsigned long)offset);
        break;
     default:
        break;
    }
    if (buf == 0)
        printf ("%s", buffer);
    else
        strcat (buf, buffer);
    return offset;
}

/* The plan is that this will take over the job of exception 3 handling -
 * the CPU emulation functions will just do a longjmp to m68k_go whenever
 * they hit an odd address. */
static int verify_ea (int reg, amodes mode, wordsizes size, uae_u32 *val)
{
    uae_u16 dp;
    uae_s8 disp8;
    uae_s16 disp16;
    int r;
    uae_u32 dispreg;
    uaecptr addr;
    uae_s32 offset = 0;

    switch (mode){
     case Dreg:
        *val = m68k_dreg (regs, reg);
        return 1;
     case Areg:
        *val = m68k_areg (regs, reg);
        return 1;

     case Aind:
     case Aipi:
        addr = m68k_areg (regs, reg);
        break;
     case Apdi:
        addr = m68k_areg (regs, reg);
        break;
     case Ad16:
        disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        addr = m68k_areg(regs,reg) + (uae_s16)disp16;
        break;
     case Ad8r:
        addr = m68k_areg (regs, reg);
     d8r_common:
        dp = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        disp8 = dp & 0xFF;
        r = (dp & 0x7000) >> 12;
        dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
        if (!(dp & 0x800)) dispreg = (uae_s32)(uae_s16)(dispreg);
        dispreg <<= (dp >> 9) & 3;

        if (dp & 0x100) {
            uae_s32 outer = 0, disp = 0;
            uae_s32 base = addr;
            if (dp & 0x80) base = 0;
            if (dp & 0x40) dispreg = 0;
            if ((dp & 0x30) == 0x20) { disp = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x30) == 0x30) { disp = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }
            base += disp;

            if ((dp & 0x3) == 0x2) { outer = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset); m68kpc_offset += 2; }
            if ((dp & 0x3) == 0x3) { outer = get_ilong_1 (m68kpc_offset); m68kpc_offset += 4; }

            if (!(dp & 4)) base += dispreg;
            if (dp & 3) base = get_long (base);
            if (dp & 4) base += dispreg;

            addr = base + outer;
        } else {
          addr += (uae_s32)((uae_s8)disp8) + dispreg;
        }
        break;
     case PC16:
        addr = m68k_getpc () + m68kpc_offset;
        disp16 = get_iword_1 (m68kpc_offset); m68kpc_offset += 2;
        addr += (uae_s16)disp16;
        break;
     case PC8r:
        addr = m68k_getpc () + m68kpc_offset;
        goto d8r_common;
     case absw:
        addr = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        break;
     case absl:
        addr = get_ilong_1 (m68kpc_offset);
        m68kpc_offset += 4;
        break;
     case imm:
        switch (size){
         case sz_byte:
            *val = get_iword_1 (m68kpc_offset) & 0xff;
            m68kpc_offset += 2;
            break;
         case sz_word:
            *val = get_iword_1 (m68kpc_offset) & 0xffff;
            m68kpc_offset += 2;
            break;
         case sz_long:
            *val = get_ilong_1 (m68kpc_offset);
            m68kpc_offset += 4;
            break;
         default:
            break;
        }
        return 1;
     case imm0:
        *val = (uae_s32)(uae_s8)get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        return 1;
     case imm1:
        *val = (uae_s32)(uae_s16)get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        return 1;
     case imm2:
        *val = get_ilong_1 (m68kpc_offset);
        m68kpc_offset += 4;
        return 1;
     case immi:
        *val = (uae_s32)(uae_s8)(reg & 0xff);
        return 1;
     default:
        addr = 0;
        break;
    }
    if ((addr & 1) == 0)
        return 1;

    last_addr_for_exception_3 = m68k_getpc () + m68kpc_offset;
    last_fault_for_exception_3 = addr;
    return 0;
}

uae_u32 get_disp_ea_020 (uae_u32 base, uae_u32 dp)
{
    int reg = (dp >> 12) & 15;
    uae_s32 regd = regs.regs[reg];
    if ((dp & 0x800) == 0)
        regd = (uae_s32)(uae_s16)regd;
    regd <<= (dp >> 9) & 3;
    if (dp & 0x100) {
        uae_s32 outer = 0;
        if (dp & 0x80) base = 0;
        if (dp & 0x40) regd = 0;

        if ((dp & 0x30) == 0x20) base += (uae_s32)(uae_s16)next_iword();
        if ((dp & 0x30) == 0x30) base += next_ilong();

        if ((dp & 0x3) == 0x2) outer = (uae_s32)(uae_s16)next_iword();
        if ((dp & 0x3) == 0x3) outer = next_ilong();

        if ((dp & 0x4) == 0) base += regd;
        if (dp & 0x3) base = get_long (base);
        if (dp & 0x4) base += regd;

        return base + outer;
    } else {
        return base + (uae_s32)((uae_s8)dp) + regd;
    }
}

uae_u32 get_disp_ea_000 (uae_u32 base, uae_u32 dp)
{
    int reg = (dp >> 12) & 15;
    uae_s32 regd = regs.regs[reg];
#if 1
    if ((dp & 0x800) == 0)
        regd = (uae_s32)(uae_s16)regd;
    return base + (uae_s8)dp + regd;
#else
    /* Branch-free code... benchmark this again now that
     * things are no longer inline.  */
    uae_s32 regd16;
    uae_u32 mask;
    mask = ((dp & 0x800) >> 11) - 1;
    regd16 = (uae_s32)(uae_s16)regd;
    regd16 &= mask;
    mask = ~mask;
    base += (uae_s8)dp;
    regd &= mask;
    regd |= regd16;
    return base + regd;
#endif
}

void MakeSR (void)
{
#if 0
    assert((regs.t1 & 1) == regs.t1);
    assert((regs.t0 & 1) == regs.t0);
    assert((regs.s & 1) == regs.s);
    assert((regs.m & 1) == regs.m);
    assert((XFLG & 1) == XFLG);
    assert((NFLG & 1) == NFLG);
    assert((ZFLG & 1) == ZFLG);
    assert((VFLG & 1) == VFLG);
    assert((CFLG & 1) == CFLG);
#endif
    regs.sr = ((regs.t1 << 15) | (regs.t0 << 14)
               | (regs.s << 13) | (regs.m << 12) | (regs.intmask << 8)
               | (GET_XFLG << 4) | (GET_NFLG << 3) | (GET_ZFLG << 2) | (GET_VFLG << 1)
               | GET_CFLG);
}

void MakeFromSR (void)
{
    int oldm = regs.m;
    int olds = regs.s;

    regs.t1 = (regs.sr >> 15) & 1;
    regs.t0 = (regs.sr >> 14) & 1;
    regs.s = (regs.sr >> 13) & 1;
    regs.m = (regs.sr >> 12) & 1;
    regs.intmask = (regs.sr >> 8) & 7;
    SET_XFLG ((regs.sr >> 4) & 1);
    SET_NFLG ((regs.sr >> 3) & 1);
    SET_ZFLG ((regs.sr >> 2) & 1);
    SET_VFLG ((regs.sr >> 1) & 1);
    SET_CFLG (regs.sr & 1);
    if (CPUType >= 2) {
        if (olds != regs.s) {
            if (olds) {
                if (oldm)
                    regs.msp = m68k_areg(regs, 7);
                else
                    regs.isp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.usp;
            } else {
                regs.usp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.m ? regs.msp : regs.isp;
            }
        } else if (olds && oldm != regs.m) {
            if (oldm) {
                regs.msp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.isp;
            } else {
                regs.isp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.msp;
            }
        }
    } else {
        if (olds != regs.s) {
            if (olds) {
                regs.isp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.usp;
            } else {
                regs.usp = m68k_areg(regs, 7);
                m68k_areg(regs, 7) = regs.isp;
            }
        }
    }

    SPCFLAGS_SET( SPCFLAG_INT );
    if (regs.t1 || regs.t0)
                SPCFLAGS_SET( SPCFLAG_TRACE );
    else
        /* Keep SPCFLAG_DOTRACE, we still want a trace exception for
           SR-modifying instructions (including STOP).  */
                SPCFLAGS_CLEAR( SPCFLAG_TRACE );
}

void Exception(int nr, uaecptr oldpc)
{
    uae_u32 currpc = m68k_getpc ();
    MakeSR();
    if (!regs.s) {
        regs.usp = m68k_areg(regs, 7);
        if (CPUType >= 2)
            m68k_areg(regs, 7) = regs.m ? regs.msp : regs.isp;
        else
            m68k_areg(regs, 7) = regs.isp;
        regs.s = 1;
    }
    if (CPUType > 0) {
        if (nr == 2 || nr == 3) {
            int i;
            /* @@@ this is probably wrong (?) */
            for (i = 0 ; i < 12 ; i++) {
                m68k_areg(regs, 7) -= 2;
                put_word (m68k_areg(regs, 7), 0);
            }
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), 0xa000 + nr * 4);
        } else if (nr ==5 || nr == 6 || nr == 7 || nr == 9) {
            m68k_areg(regs, 7) -= 4;
            put_long (m68k_areg(regs, 7), oldpc);
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), 0x2000 + nr * 4);
        } else if (regs.m && nr >= 24 && nr < 32) {
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), nr * 4);
            m68k_areg(regs, 7) -= 4;
            put_long (m68k_areg(regs, 7), currpc);
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), regs.sr);
            regs.sr |= (1 << 13);
            regs.msp = m68k_areg(regs, 7);
            m68k_areg(regs, 7) = regs.isp;
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), 0x1000 + nr * 4);
        } else {
            m68k_areg(regs, 7) -= 2;
            put_word (m68k_areg(regs, 7), nr * 4);
        }
    } else {
        if (nr == 2 || nr == 3) {
            m68k_areg(regs, 7) -= 12;
            /* ??????? */
            if (nr == 3) {
                put_long (m68k_areg(regs, 7), last_fault_for_exception_3);
                put_word (m68k_areg(regs, 7)+4, last_op_for_exception_3);
                put_long (m68k_areg(regs, 7)+8, last_addr_for_exception_3);
            }
            write_log ("Exception!\n");
            goto kludge_me_do;
        }
    }
    m68k_areg(regs, 7) -= 4;
    put_long (m68k_areg(regs, 7), currpc);
kludge_me_do:
    m68k_areg(regs, 7) -= 2;
    put_word (m68k_areg(regs, 7), regs.sr);
    m68k_setpc (get_long (regs.vbr + 4*nr));
        SPCFLAGS_SET( SPCFLAG_JIT_END_COMPILE );
    fill_prefetch_0 ();
    regs.t1 = regs.t0 = regs.m = 0;
        SPCFLAGS_CLEAR( SPCFLAG_TRACE | SPCFLAG_DOTRACE );
}

static void Interrupt(int nr)
{
    assert(nr < 8 && nr >= 0);
    lastint_regs = regs;
    lastint_no = nr;
    Exception(nr+24, 0);

    regs.intmask = nr;
        SPCFLAGS_SET( SPCFLAG_INT );
}

static int caar, cacr, tc, itt0, itt1, dtt0, dtt1, mmusr, urp, srp;

int m68k_move2c (int regno, uae_u32 *regp)
{
  if ((CPUType == 1 && (regno & 0x7FF) > 1)
          || (CPUType < 4 && (regno & 0x7FF) > 2)
          || (CPUType == 4 && regno == 0x802))
  {
        op_illg (0x4E7B);
        return 0;
  } else {
        switch (regno) {
         case 0: regs.sfc = *regp & 7; break;
         case 1: regs.dfc = *regp & 7; break;
         case 2:
                cacr = *regp & (CPUType < 4 ? 0x3 : 0x80008000);
#if USE_JIT
                if (CPUType < 4) {
                        set_cache_state(cacr&1);
                        if (*regp & 0x08)
                                flush_icache(1);
                }
                else {
                        set_cache_state((cacr&0x8000) || 0);
                        // FIXME: The User Manual claims bit 3 of CACR is undefined
                        if (*regp & 0x08)
                                flush_icache(2);
                }
#endif
         break;
         case 3: tc = *regp & 0xc000; break;
         case 4: itt0 = *regp & 0xffffe364; break;
         case 5: itt1 = *regp & 0xffffe364; break;
         case 6: dtt0 = *regp & 0xffffe364; break;
         case 7: dtt1 = *regp & 0xffffe364; break;
         case 0x800: regs.usp = *regp; break;
         case 0x801: regs.vbr = *regp; break;
         case 0x802: caar = *regp &0xfc; break;
         case 0x803: regs.msp = *regp; if (regs.m == 1) m68k_areg(regs, 7) = regs.msp; break;
         case 0x804: regs.isp = *regp; if (regs.m == 0) m68k_areg(regs, 7) = regs.isp; break;
        case 0x805: mmusr = *regp; break;
        case 0x806: urp = *regp; break;
        case 0x807: srp = *regp; break;
         default:
            op_illg (0x4E7B);
            return 0;
        }
  }
  return 1;
}

int m68k_movec2 (int regno, uae_u32 *regp)
{
    if ((CPUType == 1 && (regno & 0x7FF) > 1)
                || (CPUType < 4 && (regno & 0x7FF) > 2)
                || (CPUType == 4 && regno == 0x802))
    {
        op_illg (0x4E7A);
        return 0;
    } else {
        switch (regno) {
         case 0: *regp = regs.sfc; break;
         case 1: *regp = regs.dfc; break;
         case 2: *regp = cacr; break;
         case 3: *regp = tc; break;
         case 4: *regp = itt0; break;
         case 5: *regp = itt1; break;
         case 6: *regp = dtt0; break;
         case 7: *regp = dtt1; break;
         case 0x800: *regp = regs.usp; break;
         case 0x801: *regp = regs.vbr; break;
         case 0x802: *regp = caar; break;
         case 0x803: *regp = regs.m == 1 ? m68k_areg(regs, 7) : regs.msp; break;
         case 0x804: *regp = regs.m == 0 ? m68k_areg(regs, 7) : regs.isp; break;
        case 0x805: *regp = mmusr; break;
        case 0x806: *regp = urp; break;
        case 0x807: *regp = srp; break;
         default:
            op_illg (0x4E7A);
            return 0;
        }
        }
        return 1;
}

static __inline__ int
div_unsigned(uae_u32 src_hi, uae_u32 src_lo, uae_u32 div, uae_u32 *quot, uae_u32 *rem)
{
        uae_u32 q = 0, cbit = 0;
        int i;

        if (div <= src_hi) {
            return 1;
        }
        for (i = 0 ; i < 32 ; i++) {
                cbit = src_hi & 0x80000000ul;
                src_hi <<= 1;
                if (src_lo & 0x80000000ul) src_hi++;
                src_lo <<= 1;
                q = q << 1;
                if (cbit || div <= src_hi) {
                        q |= 1;
                        src_hi -= div;
                }
        }
        *quot = q;
        *rem = src_hi;
        return 0;
}

void m68k_divl (uae_u32 opcode, uae_u32 src, uae_u16 extra, uaecptr oldpc)
{
#if defined(uae_s64)
    if (src == 0) {
        Exception (5, oldpc);
        return;
    }
    if (extra & 0x800) {
        /* signed variant */
        uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
        uae_s64 quot, rem;

        if (extra & 0x400) {
            a &= 0xffffffffu;
            a |= (uae_s64)m68k_dreg(regs, extra & 7) << 32;
        }
        rem = a % (uae_s64)(uae_s32)src;
        quot = a / (uae_s64)(uae_s32)src;
        if ((quot & UVAL64(0xffffffff80000000)) != 0
            && (quot & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
        {
            SET_VFLG (1);
            SET_NFLG (1);
            SET_CFLG (0);
        } else {
            if (((uae_s32)rem < 0) != ((uae_s64)a < 0)) rem = -rem;
            SET_VFLG (0);
            SET_CFLG (0);
            SET_ZFLG (((uae_s32)quot) == 0);
            SET_NFLG (((uae_s32)quot) < 0);
            m68k_dreg(regs, extra & 7) = rem;
            m68k_dreg(regs, (extra >> 12) & 7) = quot;
        }
    } else {
        /* unsigned */
        uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
        uae_u64 quot, rem;

        if (extra & 0x400) {
            a &= 0xffffffffu;
            a |= (uae_u64)m68k_dreg(regs, extra & 7) << 32;
        }
        rem = a % (uae_u64)src;
        quot = a / (uae_u64)src;
        if (quot > 0xffffffffu) {
            SET_VFLG (1);
            SET_NFLG (1);
            SET_CFLG (0);
        } else {
            SET_VFLG (0);
            SET_CFLG (0);
            SET_ZFLG (((uae_s32)quot) == 0);
            SET_NFLG (((uae_s32)quot) < 0);
            m68k_dreg(regs, extra & 7) = rem;
            m68k_dreg(regs, (extra >> 12) & 7) = quot;
        }
    }
#else
    if (src == 0) {
        Exception (5, oldpc);
        return;
    }
    if (extra & 0x800) {
        /* signed variant */
        uae_s32 lo = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
        uae_s32 hi = lo < 0 ? -1 : 0;
        uae_s32 save_high;
        uae_u32 quot, rem;
        uae_u32 sign;

        if (extra & 0x400) {
            hi = (uae_s32)m68k_dreg(regs, extra & 7);
        }
        save_high = hi;
        sign = (hi ^ src);
        if (hi < 0) {
            hi = ~hi;
            lo = -lo;
            if (lo == 0) hi++;
        }
        if ((uae_s32)src < 0) src = -src;
        if (div_unsigned(hi, lo, src, &quot, &rem) ||
            (sign & 0x80000000) ? quot > 0x80000000 : quot > 0x7fffffff) {
            SET_VFLG (1);
            SET_NFLG (1);
            SET_CFLG (0);
        } else {
            if (sign & 0x80000000) quot = -quot;
            if (((uae_s32)rem < 0) != (save_high < 0)) rem = -rem;
            SET_VFLG (0);
            SET_CFLG (0);
            SET_ZFLG (((uae_s32)quot) == 0);
            SET_NFLG (((uae_s32)quot) < 0);
            m68k_dreg(regs, extra & 7) = rem;
            m68k_dreg(regs, (extra >> 12) & 7) = quot;
        }
    } else {
        /* unsigned */
        uae_u32 lo = (uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
        uae_u32 hi = 0;
        uae_u32 quot, rem;

        if (extra & 0x400) {
            hi = (uae_u32)m68k_dreg(regs, extra & 7);
        }
        if (div_unsigned(hi, lo, src, &quot, &rem)) {
            SET_VFLG (1);
            SET_NFLG (1);
            SET_CFLG (0);
        } else {
            SET_VFLG (0);
            SET_CFLG (0);
            SET_ZFLG (((uae_s32)quot) == 0);
            SET_NFLG (((uae_s32)quot) < 0);
            m68k_dreg(regs, extra & 7) = rem;
            m68k_dreg(regs, (extra >> 12) & 7) = quot;
        }
    }
#endif
}

static __inline__ void
mul_unsigned(uae_u32 src1, uae_u32 src2, uae_u32 *dst_hi, uae_u32 *dst_lo)
{
        uae_u32 r0 = (src1 & 0xffff) * (src2 & 0xffff);
        uae_u32 r1 = ((src1 >> 16) & 0xffff) * (src2 & 0xffff);
        uae_u32 r2 = (src1 & 0xffff) * ((src2 >> 16) & 0xffff);
        uae_u32 r3 = ((src1 >> 16) & 0xffff) * ((src2 >> 16) & 0xffff);
        uae_u32 lo;

        lo = r0 + ((r1 << 16) & 0xffff0000ul);
        if (lo < r0) r3++;
        r0 = lo;
        lo = r0 + ((r2 << 16) & 0xffff0000ul);
        if (lo < r0) r3++;
        r3 += ((r1 >> 16) & 0xffff) + ((r2 >> 16) & 0xffff);
        *dst_lo = lo;
        *dst_hi = r3;
}

void m68k_mull (uae_u32 opcode, uae_u32 src, uae_u16 extra)
{
#if defined(uae_s64)
    if (extra & 0x800) {
        /* signed variant */
        uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);

        a *= (uae_s64)(uae_s32)src;
        SET_VFLG (0);
        SET_CFLG (0);
        SET_ZFLG (a == 0);
        SET_NFLG (a < 0);
        if (extra & 0x400)
            m68k_dreg(regs, extra & 7) = a >> 32;
        else if ((a & UVAL64(0xffffffff80000000)) != 0
                 && (a & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
        {
            SET_VFLG (1);
        }
        m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
    } else {
        /* unsigned */
        uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);

        a *= (uae_u64)src;
        SET_VFLG (0);
        SET_CFLG (0);
        SET_ZFLG (a == 0);
        SET_NFLG (((uae_s64)a) < 0);
        if (extra & 0x400)
            m68k_dreg(regs, extra & 7) = a >> 32;
        else if ((a & UVAL64(0xffffffff00000000)) != 0) {
            SET_VFLG (1);
        }
        m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
    }
#else
    if (extra & 0x800) {
        /* signed variant */
        uae_s32 src1,src2;
        uae_u32 dst_lo,dst_hi;
        uae_u32 sign;

        src1 = (uae_s32)src;
        src2 = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
        sign = (src1 ^ src2);
        if (src1 < 0) src1 = -src1;
        if (src2 < 0) src2 = -src2;
        mul_unsigned((uae_u32)src1,(uae_u32)src2,&dst_hi,&dst_lo);
        if (sign & 0x80000000) {
                dst_hi = ~dst_hi;
                dst_lo = -dst_lo;
                if (dst_lo == 0) dst_hi++;
        }
        SET_VFLG (0);
        SET_CFLG (0);
        SET_ZFLG (dst_hi == 0 && dst_lo == 0);
        SET_NFLG (((uae_s32)dst_hi) < 0);
        if (extra & 0x400)
            m68k_dreg(regs, extra & 7) = dst_hi;
        else if ((dst_hi != 0 || (dst_lo & 0x80000000) != 0)
                 && ((dst_hi & 0xffffffff) != 0xffffffff
                     || (dst_lo & 0x80000000) != 0x80000000))
        {
            SET_VFLG (1);
        }
        m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
    } else {
        /* unsigned */
        uae_u32 dst_lo,dst_hi;

        mul_unsigned(src,(uae_u32)m68k_dreg(regs, (extra >> 12) & 7),&dst_hi,&dst_lo);

        SET_VFLG (0);
        SET_CFLG (0);
        SET_ZFLG (dst_hi == 0 && dst_lo == 0);
        SET_NFLG (((uae_s32)dst_hi) < 0);
        if (extra & 0x400)
            m68k_dreg(regs, extra & 7) = dst_hi;
        else if (dst_hi != 0) {
            SET_VFLG (1);
        }
        m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
    }
#endif
}
static char* ccnames[] =
{ "T ","F ","HI","LS","CC","CS","NE","EQ",
  "VC","VS","PL","MI","GE","LT","GT","LE" };

// If value is greater than zero, this means we are still processing an EmulOp
// because the counter is incremented only in m68k_execute(), i.e. interpretive
// execution only
static int m68k_execute_depth = 0;

void m68k_reset (void)
{
    m68k_areg (regs, 7) = 0x2000;
    m68k_setpc (ROMBaseMac + 0x2a);
    fill_prefetch_0 ();
    regs.s = 1;
    regs.m = 0;
    regs.stopped = 0;
    regs.t1 = 0;
    regs.t0 = 0;
    SET_ZFLG (0);
    SET_XFLG (0);
    SET_CFLG (0);
    SET_VFLG (0);
    SET_NFLG (0);
        SPCFLAGS_INIT( 0 );
    regs.intmask = 7;
    regs.vbr = regs.sfc = regs.dfc = 0;
    fpu_reset();
        
#if FLIGHT_RECORDER
#if ENABLE_MON
        if (log_ptr == -1) {
                // Install "log" command in mon
                mon_add_command("log", dump_log, "log                      Dump m68k emulation log\n");
        }
#endif
        log_ptr = 0;
        memset(log, 0, sizeof(log));
#endif
}

void m68k_emulop_return(void)
{
        SPCFLAGS_SET( SPCFLAG_BRK );
        quit_program = true;
}

void m68k_emulop(uae_u32 opcode)
{
                struct M68kRegisters r;
                int i;

                for (i=0; i<8; i++) {
                        r.d[i] = m68k_dreg(regs, i);
                        r.a[i] = m68k_areg(regs, i);
                }
                MakeSR();
                r.sr = regs.sr;
                EmulOp(opcode, &r);
                for (i=0; i<8; i++) {
                        m68k_dreg(regs, i) = r.d[i];
                        m68k_areg(regs, i) = r.a[i];
                }
                regs.sr = r.sr;
                MakeFromSR();
}

cpuop_rettype REGPARAM2 op_illg (uae_u32 opcode)
{
        uaecptr pc = m68k_getpc ();

    if ((opcode & 0xF000) == 0xA000) {
        Exception(0xA,0);
        cpuop_return(CFLOW_TRAP);
    }

    if ((opcode & 0xF000) == 0xF000) {
        Exception(0xB,0);
        cpuop_return(CFLOW_TRAP);
    }

    write_log ("Illegal instruction: %04x at %08lx\n", opcode, pc);
#if USE_JIT && JIT_DEBUG
    compiler_dumpstate();
#endif

    Exception (4,0);
        cpuop_return(CFLOW_TRAP);
}

void mmu_op(uae_u32 opcode, uae_u16 extra)
{
    if ((opcode & 0xFE0) == 0x0500) {
                /* PFLUSH */
                mmusr = 0;
        } else if ((opcode & 0x0FD8) == 0x548) {
                /* PTEST */
    } else
                op_illg (opcode);
}

static int n_insns = 0, n_spcinsns = 0;

static uaecptr last_trace_ad = 0;

static void do_trace (void)
{
    if (regs.t0 && CPUType >= 2) {
       uae_u16 opcode;
       /* should also include TRAP, CHK, SR modification FPcc */
       /* probably never used so why bother */
       /* We can afford this to be inefficient... */
       m68k_setpc (m68k_getpc ());
       fill_prefetch_0 ();
       opcode = get_word(m68k_getpc());
       if (opcode == 0x4e72            /* RTE */
           || opcode == 0x4e74                 /* RTD */
           || opcode == 0x4e75                 /* RTS */
           || opcode == 0x4e77                 /* RTR */
           || opcode == 0x4e76                 /* TRAPV */
           || (opcode & 0xffc0) == 0x4e80      /* JSR */
           || (opcode & 0xffc0) == 0x4ec0      /* JMP */
           || (opcode & 0xff00) == 0x6100  /* BSR */
           || ((opcode & 0xf000) == 0x6000     /* Bcc */
               && cctrue((opcode >> 8) & 0xf))
           || ((opcode & 0xf0f0) == 0x5050 /* DBcc */
               && !cctrue((opcode >> 8) & 0xf)
               && (uae_s16)m68k_dreg(regs, opcode & 7) != 0))
      {
            last_trace_ad = m68k_getpc ();
                SPCFLAGS_CLEAR( SPCFLAG_TRACE );
                SPCFLAGS_SET( SPCFLAG_DOTRACE );
        }
    } else if (regs.t1) {
       last_trace_ad = m68k_getpc ();
       SPCFLAGS_CLEAR( SPCFLAG_TRACE );
       SPCFLAGS_SET( SPCFLAG_DOTRACE );
    }
}

int m68k_do_specialties (void)
{
#if USE_JIT
    // Block was compiled
    SPCFLAGS_CLEAR( SPCFLAG_JIT_END_COMPILE );

    // Retain the request to get out of compiled code until
    // we reached the toplevel execution, i.e. the one that
    // can compile then run compiled code. This also means
    // we processed all (nested) EmulOps
    if ((m68k_execute_depth == 0) && SPCFLAGS_TEST( SPCFLAG_JIT_EXEC_RETURN ))
        SPCFLAGS_CLEAR( SPCFLAG_JIT_EXEC_RETURN );
#endif
        
    if (SPCFLAGS_TEST( SPCFLAG_DOTRACE )) {
        Exception (9,last_trace_ad);
    }
    while (SPCFLAGS_TEST( SPCFLAG_STOP )) {
        if (SPCFLAGS_TEST( SPCFLAG_INT | SPCFLAG_DOINT )){
                SPCFLAGS_CLEAR( SPCFLAG_INT | SPCFLAG_DOINT );
            int intr = intlev ();
            if (intr != -1 && intr > regs.intmask) {
                Interrupt (intr);
                regs.stopped = 0;
                SPCFLAGS_CLEAR( SPCFLAG_STOP );
            }
        }
    }
    if (SPCFLAGS_TEST( SPCFLAG_TRACE ))
       do_trace ();

    if (SPCFLAGS_TEST( SPCFLAG_DOINT )) {
        SPCFLAGS_CLEAR( SPCFLAG_DOINT );
        int intr = intlev ();
        if (intr != -1 && intr > regs.intmask) {
            Interrupt (intr);
            regs.stopped = 0;
        }
    }
    if (SPCFLAGS_TEST( SPCFLAG_INT )) {
        SPCFLAGS_CLEAR( SPCFLAG_INT );
        SPCFLAGS_SET( SPCFLAG_DOINT );
    }
    if (SPCFLAGS_TEST( SPCFLAG_BRK )) {
        SPCFLAGS_CLEAR( SPCFLAG_BRK );
        return CFLOW_EXEC_RETURN;
    }
    return 0;
}

void m68k_do_execute (void)
{
        for (;;) {
                uae_u32 opcode = GET_OPCODE;
#if FLIGHT_RECORDER
                m68k_record_step(m68k_getpc());
#endif
                (*cpufunctbl[opcode])(opcode);
                if (SPCFLAGS_TEST(SPCFLAG_ALL_BUT_EXEC_RETURN)) {
                        if (m68k_do_specialties())
                                return;
                }
        }
}

#if USE_JIT && !defined(X86_ASSEMBLY)
void m68k_compile_execute (void)
{
    for (;;) {
          if (quit_program)
                break;
          m68k_do_compile_execute();
    }
}
#endif

void m68k_execute (void)
{
#if USE_JIT
    ++m68k_execute_depth;
#endif
    for (;;) {
          if (quit_program)
                break;
          m68k_do_execute();
    }
#if USE_JIT
    --m68k_execute_depth;
#endif
}

static void m68k_verify (uaecptr addr, uaecptr *nextpc)
{
    uae_u32 opcode, val;
    struct instr *dp;

    opcode = get_iword_1(0);
    last_op_for_exception_3 = opcode;
    m68kpc_offset = 2;

    if (cpufunctbl[cft_map (opcode)] == op_illg_1) {
        opcode = 0x4AFC;
    }
    dp = table68k + opcode;

    if (dp->suse) {
        if (!verify_ea (dp->sreg, (amodes)dp->smode, (wordsizes)dp->size, &val)) {
            Exception (3, 0);
            return;
        }
    }
    if (dp->duse) {
        if (!verify_ea (dp->dreg, (amodes)dp->dmode, (wordsizes)dp->size, &val)) {
            Exception (3, 0);
            return;
        }
    }
}

void m68k_disasm (uaecptr addr, uaecptr *nextpc, int cnt)
{
    uaecptr newpc = 0;
    m68kpc_offset = addr - m68k_getpc ();
    while (cnt-- > 0) {
        char instrname[20],*ccpt;
        int opwords;
        uae_u32 opcode;
        struct mnemolookup *lookup;
        struct instr *dp;
        printf ("%08lx: ", m68k_getpc () + m68kpc_offset);
        for (opwords = 0; opwords < 5; opwords++){
            printf ("%04x ", get_iword_1 (m68kpc_offset + opwords*2));
        }
        opcode = get_iword_1 (m68kpc_offset);
        m68kpc_offset += 2;
        if (cpufunctbl[cft_map (opcode)] == op_illg_1) {
            opcode = 0x4AFC;
        }
        dp = table68k + opcode;
        for (lookup = lookuptab;lookup->mnemo != dp->mnemo; lookup++)
            ;

        strcpy (instrname, lookup->name);
        ccpt = strstr (instrname, "cc");
        if (ccpt != 0) {
            strncpy (ccpt, ccnames[dp->cc], 2);
        }
        printf ("%s", instrname);
        switch (dp->size){
         case sz_byte: printf (".B "); break;
         case sz_word: printf (".W "); break;
         case sz_long: printf (".L "); break;
         default: printf ("   "); break;
        }

        if (dp->suse) {
            newpc = m68k_getpc () + m68kpc_offset;
            newpc += ShowEA (dp->sreg, (amodes)dp->smode, (wordsizes)dp->size, 0);
        }
        if (dp->suse && dp->duse)
            printf (",");
        if (dp->duse) {
            newpc = m68k_getpc () + m68kpc_offset;
            newpc += ShowEA (dp->dreg, (amodes)dp->dmode, (wordsizes)dp->size, 0);
        }
        if (ccpt != 0) {
            if (cctrue(dp->cc))
                printf (" == %08lx (TRUE)", newpc);
            else
                printf (" == %08lx (FALSE)", newpc);
        } else if ((opcode & 0xff00) == 0x6100) /* BSR */
            printf (" == %08lx", newpc);
        printf ("\n");
    }
    if (nextpc)
        *nextpc = m68k_getpc () + m68kpc_offset;
}

void m68k_dumpstate (uaecptr *nextpc)
{
    int i;
    for (i = 0; i < 8; i++){
        printf ("D%d: %08lx ", i, m68k_dreg(regs, i));
        if ((i & 3) == 3) printf ("\n");
    }
    for (i = 0; i < 8; i++){
        printf ("A%d: %08lx ", i, m68k_areg(regs, i));
        if ((i & 3) == 3) printf ("\n");
    }
    if (regs.s == 0) regs.usp = m68k_areg(regs, 7);
    if (regs.s && regs.m) regs.msp = m68k_areg(regs, 7);
    if (regs.s && regs.m == 0) regs.isp = m68k_areg(regs, 7);
    printf ("USP=%08lx ISP=%08lx MSP=%08lx VBR=%08lx\n",
            regs.usp,regs.isp,regs.msp,regs.vbr);
    printf ("T=%d%d S=%d M=%d X=%d N=%d Z=%d V=%d C=%d IMASK=%d\n",
            regs.t1, regs.t0, regs.s, regs.m,
            GET_XFLG, GET_NFLG, GET_ZFLG, GET_VFLG, GET_CFLG, regs.intmask);
        
        fpu_dump_registers();
        fpu_dump_flags();
        
    m68k_disasm(m68k_getpc (), nextpc, 1);
    if (nextpc)
        printf ("next PC: %08lx\n", *nextpc);
}
Revision:	1.17
Committed:	2002-10-01T09:39:55Z (22 years, 1 month ago) by gbeauche
Branch:	MAIN
Changes since 1.16:	+9 -36 lines
Log Message:	- Optimize use of quit_program variable. This is a real boolean for B2. - Remove unused/dead code concerning surroundings of (debugging). - m68k_compile_execute() is generated and optimized code now.