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newcpu.c
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newcpu.c
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/*
* UAE - The Un*x Amiga Emulator
*
* MC68000 emulation
*
* (c) 1995 Bernd Schmidt
*/
#include "sysconfig.h"
#include "sysdeps.h"
#include "config.h"
#include "options.h"
#include "machdep/m68k.h"
#ifndef BASILISK
#include "events.h"
#endif
#include "gui.h"
#ifndef BASILISK
#include "memory.h"
#include "custom.h"
#else
#include "basilisk/include/memory.h"
#endif
#include "readcpu.h"
#include "newcpu.h"
#include "debug.h"
#include "compiler.h"
#ifndef BASILISK
#include "autoconf.h"
#include "ersatz.h"
#include "blitter.h"
#else
#include "patches.h"
#include "via.h"
#endif
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];
int fpp_movem_index1[256];
int fpp_movem_index2[256];
int fpp_movem_next[256];
cpuop_func *cpufunctbl[65536];
#if USER_PROGRAMS_BEHAVE > 0
cpuop_func *cpufunctbl_behaved[65536];
#endif
#define COUNT_INSTRS 0
#if COUNT_INSTRS
UWORD opcode;
static unsigned long int instrcount[65536];
static UWORD opcodenums[65536];
static int compfn(const void *el1, const void *el2)
{
return instrcount[*(const UWORD *)el1] < instrcount[*(const UWORD *)el2];
}
void dump_counts(void)
{
FILE *f = fopen(getenv("INSNCOUNT") ? getenv("INSNCOUNT") : "insncount", "w");
unsigned long int total = 0;
int i;
for(i=0; i < 65536; i++) {
opcodenums[i] = i;
total += instrcount[i];
}
qsort(opcodenums, 65536, sizeof(UWORD), 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;
void init_m68k (void)
{
long int opcode;
int i,j;
for (i = 0 ; i < 256 ; i++) {
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));
}
for (i = 0 ; i < 256 ; i++) {
for (j = 7 ; j >= 0 ; j--) {
if (i & (1 << j)) break;
}
fpp_movem_index1[i] = j;
fpp_movem_index2[i] = 7-j;
fpp_movem_next[i] = i & (~(1 << j));
}
#if COUNT_INSTRS
{
FILE *f = fopen("insncount", "r");
memset(instrcount, 0, sizeof instrcount);
if (f) {
ULONG opcode, count, total;
char name[20];
fscanf(f,"Total: %lu\n",&total);
while(fscanf(f,"%lx: %lu %s\n",&opcode,&count,name)==3) {
instrcount[opcode] = count;
}
fclose(f);
}
}
#endif
printf("Building CPU table...\n");
read_table68k ();
do_merges ();
for (opcode = 0; opcode < 65536; opcode++)
cpufunctbl[opcode] = op_illg;
for (i = 0; op_smalltbl[i].handler != NULL; i++) {
if (!op_smalltbl[i].specific)
cpufunctbl[op_smalltbl[i].opcode] = op_smalltbl[i].handler;
}
for (opcode = 0; opcode < 65536; opcode++) {
cpuop_func *f;
if (table68k[opcode].mnemo == i_ILLG)
continue;
if (table68k[opcode].handler != -1) {
f = cpufunctbl[table68k[opcode].handler];
if (f == op_illg)
abort();
cpufunctbl[opcode] = f;
}
}
for (i = 0; op_smalltbl[i].handler != NULL; i++) {
if (op_smalltbl[i].specific)
cpufunctbl[op_smalltbl[i].opcode] = op_smalltbl[i].handler;
}
#if USER_PROGRAMS_BEHAVE > 0
for (opcode = 0; opcode < 65536; opcode++)
cpufunctbl_behaved[opcode] = op_illg;
for (i = 0; op_direct_smalltbl[i].handler != NULL; i++) {
if (!op_direct_smalltbl[i].specific)
cpufunctbl_behaved[op_direct_smalltbl[i].opcode] = op_direct_smalltbl[i].handler;
}
for (opcode = 0; opcode < 65536; opcode++) {
cpuop_func *f;
if (table68k[opcode].mnemo == i_ILLG)
continue;
if (table68k[opcode].handler != -1) {
f = cpufunctbl_behaved[table68k[opcode].handler];
if (f == op_illg)
abort();
cpufunctbl_behaved[opcode] = f;
}
}
for (i = 0; op_direct_smalltbl[i].handler != NULL; i++) {
if (op_direct_smalltbl[i].specific)
cpufunctbl_behaved[op_direct_smalltbl[i].opcode] = op_direct_smalltbl[i].handler;
}
#endif
}
struct regstruct regs, lastint_regs;
static struct regstruct regs_backup[16];
static int backup_pointer = 0;
int lastint_no;
LONG ShowEA(int reg, amodes mode, wordsizes size, char *buf)
{
UWORD dp;
BYTE disp8;
WORD disp16;
int r;
ULONG dispreg;
CPTR addr;
LONG 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 = nextiword();
addr = m68k_areg(regs,reg) + (WORD)disp16;
sprintf(buffer,"(A%d,$%04x) == $%08lx", reg, disp16 & 0xffff,
(long unsigned int)addr);
break;
case Ad8r:
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
if (!(dp & 0x800)) dispreg = (LONG)(WORD)(dispreg);
dispreg <<= (dp >> 9) & 3;
if (dp & 0x100) {
LONG outer = 0, disp = 0;
LONG 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 = (LONG)(WORD)nextiword();
if ((dp & 0x30) == 0x30) disp = nextilong();
base += disp;
if ((dp & 0x3) == 0x2) outer = (LONG)(WORD)nextiword();
if ((dp & 0x3) == 0x3) outer = nextilong();
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,
(long unsigned int)addr);
}
else {
addr = m68k_areg(regs,reg) + (LONG)((BYTE)disp8) + dispreg;
sprintf(buffer,"(A%d, %c%d.%c*%d, $%02x) == $%08lx", reg,
dp & 0x8000 ? 'A' : 'D', (int)r, dp & 0x800 ? 'L' : 'W',
1 << ((dp >> 9) & 3), disp8,
(long unsigned int)addr);
}
break;
case PC16:
addr = m68k_getpc();
disp16 = nextiword();
addr += (WORD)disp16;
sprintf(buffer,"(PC,$%04x) == $%08lx", disp16 & 0xffff,(long unsigned int)addr);
break;
case PC8r:
addr = m68k_getpc();
dp = nextiword();
disp8 = dp & 0xFF;
r = (dp & 0x7000) >> 12;
dispreg = dp & 0x8000 ? m68k_areg(regs,r) : m68k_dreg(regs,r);
if (!(dp & 0x800)) dispreg = (LONG)(WORD)(dispreg);
dispreg <<= (dp >> 9) & 3;
if (dp & 0x100) {
LONG outer = 0,disp = 0;
LONG base = addr;
char name[10];
sprintf(name,"PC, ");
if (dp & 0x80) { base = 0; name[0] = 0; }
if (dp & 0x80) base = 0;
if (dp & 0x40) dispreg = 0;
if ((dp & 0x30) == 0x20) disp = (LONG)(WORD)nextiword();
if ((dp & 0x30) == 0x30) disp = nextilong();
base += disp;
if ((dp & 0x3) == 0x2) outer = (LONG)(WORD)nextiword();
if ((dp & 0x3) == 0x3) outer = nextilong();
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,
(long unsigned int)addr);
} else {
addr += (LONG)((BYTE)disp8) + dispreg;
sprintf(buffer,"(PC, %c%d.%c*%d, $%02x) == $%08lx", dp & 0x8000 ? 'A' : 'D',
(int)r, dp & 0x800 ? 'L' : 'W', 1 << ((dp >> 9) & 3),
disp8, (long unsigned int)addr);
}
break;
case absw:
sprintf(buffer,"$%08lx", (long unsigned int)(LONG)(WORD)nextiword());
break;
case absl:
sprintf(buffer,"$%08lx", (long unsigned int)nextilong());
break;
case imm:
switch(size){
case sz_byte:
sprintf(buffer,"#$%02x", (unsigned int)(nextiword() & 0xff)); break;
case sz_word:
sprintf(buffer,"#$%04x", (unsigned int)(nextiword() & 0xffff)); break;
case sz_long:
sprintf(buffer,"#$%08lx", (long unsigned int)(nextilong())); break;
default:
break;
}
break;
case imm0:
offset = (LONG)(BYTE)nextiword();
sprintf(buffer,"#$%02x", (unsigned int)(offset & 0xff));
break;
case imm1:
offset = (LONG)(WORD)nextiword();
sprintf(buffer,"#$%04x", (unsigned int)(offset & 0xffff));
break;
case imm2:
offset = (LONG)nextilong();
sprintf(buffer,"#$%08lx", (long unsigned int)offset);
break;
case immi:
offset = (LONG)(BYTE)(reg & 0xff);
sprintf(buffer,"#$%08lx", (long unsigned int)offset);
break;
default:
break;
}
if (buf == 0)
printf("%s", buffer);
else
strcat(buf, buffer);
return offset;
}
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)
| (XFLG << 4) | (NFLG << 3) | (ZFLG << 2) | (VFLG << 1)
| 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;
XFLG = (regs.sr >> 4) & 1;
NFLG = (regs.sr >> 3) & 1;
ZFLG = (regs.sr >> 2) & 1;
VFLG = (regs.sr >> 1) & 1;
CFLG = regs.sr & 1;
if (CPU_LEVEL >= 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;
}
}
}
regs.spcflags |= SPCFLAG_INT;
if (regs.t1 || regs.t0)
regs.spcflags |= SPCFLAG_TRACE;
else
regs.spcflags &= ~(SPCFLAG_TRACE | SPCFLAG_DOTRACE);
}
void Exception(int nr, CPTR oldpc)
{
compiler_flush_jsr_stack();
MakeSR();
if (!regs.s) {
regs.usp = m68k_areg(regs, 7);
if (CPU_LEVEL >= 2)
m68k_areg(regs, 7) = regs.m ? regs.msp : regs.isp;
else
m68k_areg(regs, 7) = regs.isp;
regs.s = 1;
}
if (CPU_LEVEL > 0) {
if (nr == 2 || nr == 3) {
int i;
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), m68k_getpc ());
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);
}
}
m68k_areg(regs, 7) -= 4;
put_long (m68k_areg(regs, 7), m68k_getpc ());
m68k_areg(regs, 7) -= 2;
put_word (m68k_areg(regs, 7), regs.sr);
m68k_setpc(get_long(regs.vbr + 4*nr));
regs.t1 = regs.t0 = regs.m = 0;
regs.spcflags &= ~(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;
regs.spcflags |= SPCFLAG_INT;
}
static int caar, cacr;
void m68k_move2c (int regno, ULONG *regp)
{
if (CPU_LEVEL == 1 && (regno & 0x7FF) > 1)
op_illg (0x4E7B);
else
switch (regno) {
case 0: regs.sfc = *regp & 7; break;
case 1: regs.dfc = *regp & 7; break;
case 2: cacr = *regp & 0x3; break; /* ignore C and CE */
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;
default:
op_illg (0x4E7B);
break;
}
}
void m68k_movec2 (int regno, ULONG *regp)
{
if (CPU_LEVEL == 1 && (regno & 0x7FF) > 1)
op_illg (0x4E7A);
else
switch (regno) {
case 0: *regp = regs.sfc; break;
case 1: *regp = regs.dfc; break;
case 2: *regp = cacr; 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;
default:
op_illg (0x4E7A);
break;
}
}
static __inline__ int
div_unsigned(ULONG src_hi, ULONG src_lo, ULONG div, ULONG *quot, ULONG *rem)
{
ULONG 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 (ULONG opcode, ULONG src, UWORD extra, CPTR oldpc)
{
#if defined(INT_64BIT)
if (src == 0) {
Exception(5,oldpc-2);
return;
}
if (extra & 0x800) {
/* signed variant */
INT_64BIT a = (INT_64BIT)(LONG)m68k_dreg(regs, (extra >> 12) & 7);
INT_64BIT quot, rem;
if (extra & 0x400) {
a &= 0xffffffffLL;
a |= (INT_64BIT)m68k_dreg(regs, extra & 7) << 32;
}
rem = a % (INT_64BIT)(LONG)src;
quot = a / (INT_64BIT)(LONG)src;
if ((quot & 0xffffffff80000000uLL) != 0 &&
(quot & 0xffffffff80000000uLL) != 0xffffffff80000000uLL) {
VFLG = NFLG = 1;
CFLG = 0;
}
else {
if (((LONG)rem < 0) != ((INT_64BIT)a < 0)) rem = -rem;
VFLG = CFLG = 0;
ZFLG = ((LONG)quot) == 0;
NFLG = ((LONG)quot) < 0;
m68k_dreg(regs, extra & 7) = rem;
m68k_dreg(regs, (extra >> 12) & 7) = quot;
}
} else {
/* unsigned */
unsigned INT_64BIT a = (unsigned INT_64BIT)(ULONG)m68k_dreg(regs, (extra >> 12) & 7);
unsigned INT_64BIT quot, rem;
if (extra & 0x400) {
a &= 0xffffffffLL;
a |= (unsigned INT_64BIT)m68k_dreg(regs, extra & 7) << 32;
}
rem = a % (unsigned INT_64BIT)src;
quot = a / (unsigned INT_64BIT)src;
if (quot > 0xffffffffLL) {
VFLG = NFLG = 1;
CFLG = 0;
}
else {
VFLG = CFLG = 0;
ZFLG = ((LONG)quot) == 0;
NFLG = ((LONG)quot) < 0;
m68k_dreg(regs, extra & 7) = rem;
m68k_dreg(regs, (extra >> 12) & 7) = quot;
}
}
#else
if (src == 0) {
Exception(5,oldpc-2);
return;
}
if (extra & 0x800) {
/* signed variant */
LONG lo = (LONG)m68k_dreg(regs, (extra >> 12) & 7);
LONG hi = lo < 0 ? -1 : 0;
LONG save_high;
ULONG quot, rem;
ULONG sign;
if (extra & 0x400) {
hi = (LONG)m68k_dreg(regs, extra & 7);
}
save_high = hi;
sign = (hi ^ src);
if (hi < 0) {
hi = ~hi;
lo = -lo;
if (lo == 0) hi++;
}
if ((LONG)src < 0) src = -src;
if (div_unsigned(hi, lo, src, ", &rem) ||
(sign & 0x80000000) ? quot > 0x80000000 : quot > 0x7fffffff) {
VFLG = NFLG = 1;
CFLG = 0;
}
else {
if (sign & 0x80000000) quot = -quot;
if (((LONG)rem < 0) != (save_high < 0)) rem = -rem;
VFLG = CFLG = 0;
ZFLG = ((LONG)quot) == 0;
NFLG = ((LONG)quot) < 0;
m68k_dreg(regs, extra & 7) = rem;
m68k_dreg(regs, (extra >> 12) & 7) = quot;
}
} else {
/* unsigned */
ULONG lo = (ULONG)m68k_dreg(regs, (extra >> 12) & 7);
ULONG hi = 0;
ULONG quot, rem;
if (extra & 0x400) {
hi = (ULONG)m68k_dreg(regs, extra & 7);
}
if (div_unsigned(hi, lo, src, ", &rem)) {
VFLG = NFLG = 1;
CFLG = 0;
}
else {
VFLG = CFLG = 0;
ZFLG = ((LONG)quot) == 0;
NFLG = ((LONG)quot) < 0;
m68k_dreg(regs, extra & 7) = rem;
m68k_dreg(regs, (extra >> 12) & 7) = quot;
}
}
#endif
}
static __inline__ void
mul_unsigned(ULONG src1, ULONG src2, ULONG *dst_hi, ULONG *dst_lo)
{
ULONG r0 = (src1 & 0xffff) * (src2 & 0xffff);
ULONG r1 = ((src1 >> 16) & 0xffff) * (src2 & 0xffff);
ULONG r2 = (src1 & 0xffff) * ((src2 >> 16) & 0xffff);
ULONG r3 = ((src1 >> 16) & 0xffff) * ((src2 >> 16) & 0xffff);
ULONG 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 (ULONG opcode, ULONG src, UWORD extra)
{
#if defined(INT_64BIT)
if (extra & 0x800) {
/* signed variant */
INT_64BIT a = (INT_64BIT)(LONG)m68k_dreg(regs, (extra >> 12) & 7);
a *= (INT_64BIT)(LONG)src;
VFLG = CFLG = 0;
ZFLG = a == 0;
NFLG = a < 0;
if (extra & 0x400)
m68k_dreg(regs, extra & 7) = a >> 32;
else if ((a & 0xffffffff80000000uLL) != 0 &&
(a & 0xffffffff80000000uLL) != 0xffffffff80000000uLL) {
VFLG = 1;
}
m68k_dreg(regs, (extra >> 12) & 7) = (ULONG)a;
} else {
/* unsigned */
unsigned INT_64BIT a = (unsigned INT_64BIT)(ULONG)m68k_dreg(regs, (extra >> 12) & 7);
a *= (unsigned INT_64BIT)src;
VFLG = CFLG = 0;
ZFLG = a == 0;
NFLG = ((INT_64BIT)a) < 0;
if (extra & 0x400)
m68k_dreg(regs, extra & 7) = a >> 32;
else if ((a & 0xffffffff00000000uLL) != 0) {
VFLG = 1;
}
m68k_dreg(regs, (extra >> 12) & 7) = (ULONG)a;
}
#else
if (extra & 0x800) {
/* signed variant */
LONG src1,src2;
ULONG dst_lo,dst_hi;
ULONG sign;
src1 = (LONG)src;
src2 = (LONG)m68k_dreg(regs, (extra >> 12) & 7);
sign = (src1 ^ src2);
if (src1 < 0) src1 = -src1;
if (src2 < 0) src2 = -src2;
mul_unsigned((ULONG)src1,(ULONG)src2,&dst_hi,&dst_lo);
if (sign & 0x80000000) {
dst_hi = ~dst_hi;
dst_lo = -dst_lo;
if (dst_lo == 0) dst_hi++;
}
VFLG = CFLG = 0;
ZFLG = dst_hi == 0 && dst_lo == 0;
NFLG = ((LONG)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)) {
VFLG = 1;
}
m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
} else {
/* unsigned */
ULONG dst_lo,dst_hi;
mul_unsigned(src,(ULONG)m68k_dreg(regs, (extra >> 12) & 7),&dst_hi,&dst_lo);
VFLG = CFLG = 0;
ZFLG = dst_hi == 0 && dst_lo == 0;
NFLG = ((LONG)dst_hi) < 0;
if (extra & 0x400)
m68k_dreg(regs, extra & 7) = dst_hi;
else if (dst_hi != 0) {
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" };
void m68k_reset(void)
{
#ifndef BASILISK
m68k_areg(regs, 7) = get_long(0x00f80000);
m68k_setpc(get_long(0x00f80004));
#else
m68k_areg(regs, 7) = get_long(rommem_start);
m68k_setpc(get_long(rommem_start+4));
#endif
regs.kick_mask = 0xF80000;
regs.s = 1;
regs.m = 0;
regs.stopped = 0;
regs.t1 = 0;
regs.t0 = 0;
ZFLG = CFLG = NFLG = VFLG = 0;
regs.spcflags = 0;
regs.intmask = 7;
regs.vbr = regs.sfc = regs.dfc = 0;
regs.fpcr = regs.fpsr = regs.fpiar = 0;
customreset();
}
void REGPARAM2 op_illg(ULONG opcode)
{
compiler_flush_jsr_stack();
#ifndef BASILISK
if (opcode == 0x4E7B && get_long(0x10) == 0
&& (m68k_getpc() & 0xF80000) == 0xF80000)
{
fprintf(stderr, "Your Kickstart requires a 68020 CPU. Giving up.\n");
broken_in = 1;
regs.spcflags |= SPCFLAG_BRK;
quit_program = 1;
}
if (opcode == 0xFF0D) {
if ((m68k_getpc() & 0xF80000) == 0xF80000) {
/* This is from the dummy Kickstart replacement */
ersatz_perform (nextiword ());
return;
} else if ((m68k_getpc() & 0xF80000) == 0xF00000) {
/* User-mode STOP replacement */
m68k_setstopped(1);
return;
}
}
#else
if (opcode == 0xFF0E) {
regs.spcflags |= SPCFLAG_EMULTRAP;
return;
}
if (opcode == 0xFF0D) {
/* This is from the dummy Kickstart replacement */
ersatz_perform (nextiword ());
return;
}
#endif
#ifdef USE_POINTER
regs.pc_p -= 2;
#else
regs.pc -= 2;
#endif
if ((opcode & 0xF000) == 0xF000) {
Exception(0xB,0);
return;
}
if ((opcode & 0xF000) == 0xA000) {
Exception(0xA,0);
return;
}
fprintf(stderr, "Illegal instruction: %04x at %08lx\n", opcode, m68k_getpc());
Exception(4,0);
}
void mmu_op(ULONG opcode, UWORD extra)
{
if ((extra & 0xB000) == 0) { /* PMOVE instruction */
} else if ((extra & 0xF000) == 0x2000) { /* PLOAD instruction */
} else if ((extra & 0xF000) == 0x8000) { /* PTEST instruction */
} else
op_illg(opcode);
}
static int n_insns=0, n_spcinsns=0;
static CPTR last_trace_ad = 0;
static __inline__ void do_trace(void)
{
if (regs.spcflags & SPCFLAG_TRACE) { /* 6 */
if (regs.t0) {
UWORD 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());
opcode = get_word(regs.pc);
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)
&& (WORD)m68k_dreg(regs, opcode & 7) != 0))
{
last_trace_ad = m68k_getpc();
regs.spcflags &= ~SPCFLAG_TRACE;
regs.spcflags |= SPCFLAG_DOTRACE;
}
} else if (regs.t1) {
last_trace_ad = m68k_getpc();
regs.spcflags &= ~SPCFLAG_TRACE;
regs.spcflags |= SPCFLAG_DOTRACE;
}
}
}
#ifdef BASILISK
#define do_cycles() ;
#define do_disk() ;
//static void basilisk_tick_handler(void);
static int count=0;
#endif
static void m68k_run_1(void)
{
regs.spcflags &= ~(SPCFLAG_EMULTRAP);
for(;;) {
/* assert (!regs.stopped && !(regs.spcflags & SPCFLAG_STOP)); */
/* regs_backup[backup_pointer = (backup_pointer + 1) % 16] = regs;*/
#if COUNT_INSTRS
instrcount[opcode]++;
// count += opcode;
#endif
#if defined(X86_ASSEMBLY)
{
ULONG opcode = nextiword();
__asm__ __volatile__("\tcall *%%ebx"
: : "b" (cpufunctbl[opcode]), "a" (opcode)
: "%eax", "%ebx", "%edx", "%ecx",
"%esi", "%edi", "%ebp", "memory", "cc");
}
#else
{
ULONG opcode = nextiword();
(*cpufunctbl[opcode])(opcode);
}
#endif
#ifndef NO_EXCEPTION_3
if (buserr) {
Exception(3,0);
buserr = 0;
}
#endif
if (regs.spcflags & SPCFLAG_EMULTRAP)
return;
/*n_insns++;*/
#if BASILISK
/*Im cheating to trigger some update
it should be timed and periodic to the VBL
60hz...*/
if(++count>500){
basilisk_tick_handler();
count=0;
}
#endif
do_cycles();
if (regs.spcflags) {
/*n_spcinsns++;*/
while (regs.spcflags & SPCFLAG_BLTNASTY) {
do_cycles();
if (regs.spcflags & SPCFLAG_DISK)
do_disk();
}
run_compiled_code();
if (regs.spcflags & SPCFLAG_DOTRACE) {
Exception(9,last_trace_ad);
}
while (regs.spcflags & SPCFLAG_STOP) {
do_cycles();
if (regs.spcflags & SPCFLAG_DISK)
do_disk();
if (regs.spcflags & (SPCFLAG_INT | SPCFLAG_DOINT | SPCFLAG_TIMER)){
int intr = intlev();
regs.spcflags &= ~(SPCFLAG_INT | SPCFLAG_DOINT);
if (intr != -1 && intr > regs.intmask) {
Interrupt(intr);
regs.stopped = 0;
regs.spcflags &= ~SPCFLAG_STOP;
}
}
}
do_trace();
#ifdef WANT_SLOW_MULTIPLY
/* Kludge for Hardwired demo. The guys who wrote it should be
* mutilated. */
if (regs.spcflags & SPCFLAG_EXTRA_CYCLES) {
do_cycles (); do_cycles (); do_cycles (); do_cycles ();
regs.spcflags &= ~SPCFLAG_EXTRA_CYCLES;
}
#endif
if (regs.spcflags & SPCFLAG_DISK)
do_disk();
if (regs.spcflags & (SPCFLAG_DOINT|SPCFLAG_TIMER)) {
int intr = intlev();
regs.spcflags &= ~SPCFLAG_DOINT;
if (intr != -1 && intr > regs.intmask) {
Interrupt(intr);