ref: d497eb2d2f88e3ae7fd7b2a4594aededed75468e
dir: /sys/src/games/md/cpu.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "../eui.h"
#include "dat.h"
#include "fns.h"
enum {
FLAGS = 1<<13,
FLAGX = 16,
FLAGN = 8,
FLAGZ = 4,
FLAGV = 2,
FLAGC = 1,
};
u32int r[16], pc, curpc;
u32int asp, irq, stop;
extern u32int irql[8];
u32int irqla[8];
u16int rS;
static u32int op;
int tim;
#define ra (r+8)
static void
undef(void)
{
sysfatal("undefined opcode %#o at pc=%#.6x", op, curpc);
}
static u16int
fetch16(void)
{
u16int v;
v = memread(pc);
pc += 2;
return v;
}
static u32int
fetch32(void)
{
u32int v;
v = fetch16() << 16;
return v | fetch16();
}
static void
push16(u16int u)
{
ra[7] -= 2;
memwrite(ra[7], u, -1);
}
static u16int
pop16(void)
{
u16int v;
v = memread(ra[7]);
ra[7] += 2;
return v;
}
static void
push32(u32int u)
{
ra[7] -= 4;
memwrite(ra[7], u >> 16, -1);
memwrite(ra[7] + 2, u, -1);
}
static u32int
pop32(void)
{
u32int v;
v = memread(ra[7]) << 16;
v |= memread(ra[7] + 2);
ra[7] += 4;
return v;
}
static vlong
amode(int m, int n, int s)
{
u16int w;
u32int v;
m &= 7;
n &= 7;
s &= 3;
if(n == 7 && s == 0)
s++;
switch(m){
case 0:
return ~n;
case 1:
return ~(n+8);
case 2:
tim += s == 2 ? 8 : 4;
return ra[n];
case 3:
v = ra[n];
ra[n] += 1<<s;
tim += s == 2 ? 8 : 4;
return v;
case 4:
tim += s == 2 ? 10 : 6;
return ra[n] -= 1<<s;
case 5:
tim += s == 2 ? 12 : 8;
return (u32int)(ra[n] + (s16int)fetch16());
case 6:
tim += s == 2 ? 14 : 10;
w = fetch16();
v = r[w >> 12];
if((w & 1<<11) == 0)
v = (s16int)v;
return (u32int)(ra[n] + v + (s8int)w);
case 7:
switch(n){
case 0:
tim += s == 2 ? 12 : 8;
return (u32int)(s16int)fetch16();
case 1:
tim += s == 2 ? 16 : 12;
return fetch32();
case 2:
tim += s == 2 ? 12 : 8;
v = fetch16();
return (u32int)(pc + (s16int)v - 2);
case 3:
tim += s == 2 ? 14 : 4;
w = fetch16();
v = r[w >> 12];
if((w & 1<<11) == 0)
v = (s16int)v;
return (u32int)(pc + v + (s8int)w - 2);
case 4:
tim += s == 2 ? 8 : 4;
v = pc;
pc += 1<<s;
if(s == 0)
v = pc++;
return v;
default:
undef();
}
default:
undef();
}
return 0;
}
static u32int
rmode(vlong a, int s)
{
u32int v;
if(a >= 0){
switch(s & 3){
case 0:
v = memread(a);
if((a & 1) == 0)
v >>= 8;
return (s8int) v;
default:
return (s16int) memread(a);
case 2:
v = memread(a) << 16;
return v | memread(a + 2);
}
}
v = r[~a];
switch(s & 3){
case 0: return (s8int) v;
case 1: return (s16int) v;
default: return v;
}
}
static void
wmode(vlong a, int s, u32int v)
{
int n;
if(a >= 0){
switch(s & 3){
case 0:
memwrite(a, (u8int)v | (u8int)v << 8, (a & 1) != 0 ? 0xff : 0xff00);
return;
default:
memwrite(a, v, -1);
return;
case 2:
memwrite(a, v >> 16, -1);
memwrite(a + 2, v, -1);
return;
}
}
n = ~a;
if(n < 8){
switch(s){
case 0: r[n] = r[n] & 0xffffff00 | v & 0xff; break;
case 1: r[n] = r[n] & 0xffff0000 | v & 0xffff; break;
default: r[n] = v;
}
}else{
if(s == 1)
v = (s16int) v;
r[n] = v;
}
}
static void
nz(u32int v, int s)
{
switch(s){
case 0: v = (s8int) v; break;
case 1: v = (s16int) v; break;
}
rS &= ~(FLAGC|FLAGN|FLAGV|FLAGZ);
if(v == 0)
rS |= FLAGZ;
if((s32int)v < 0)
rS |= FLAGN;
}
static u32int
add(u32int u, u32int w, int c, int s)
{
u64int v;
rS &= ~(FLAGN|FLAGV|FLAGC);
switch(s){
case 0:
v = (u8int)w + (u8int)u + c;
if(v >= 0x100)
rS |= FLAGC;
if((v & 0x80) != 0)
rS |= FLAGN;
if((~(w ^ u) & (v ^ u) & 0x80) != 0)
rS |= FLAGV;
if((u8int)v != 0)
rS &= ~FLAGZ;
break;
case 1:
v = (u16int)w + (u16int)u + c;
if(v >= 0x10000)
rS |= FLAGC;
if((v & 0x8000) != 0)
rS |= FLAGN;
if((~(w ^ u) & (v ^ u) & 0x8000) != 0)
rS |= FLAGV;
if((u16int)v != 0)
rS &= ~FLAGZ;
break;
default:
v = (u64int)w + u + c;
if((v >> 32) != 0)
rS |= FLAGC;
if((v & 0x80000000) != 0)
rS |= FLAGN;
if((~(w ^ u) & (v ^ u) & 0x80000000) != 0)
rS |= FLAGV;
if((u32int)v != 0)
rS &= ~FLAGZ;
break;
}
return v;
}
static u32int
sub(u32int u, u32int w, int c, int s)
{
u64int v;
rS &= ~(FLAGN|FLAGV|FLAGC);
switch(s){
case 0:
v = (u8int)u - (u8int)w - c;
if(v >= 0x100)
rS |= FLAGC;
if((v & 0x80) != 0)
rS |= FLAGN;
if(((w ^ u) & (v ^ u) & 0x80) != 0)
rS |= FLAGV;
if((u8int)v != 0)
rS &= ~FLAGZ;
break;
case 1:
v = (u16int)u - (u16int)w - c;
if(v >= 0x10000)
rS |= FLAGC;
if((v & 0x8000) != 0)
rS |= FLAGN;
if(((w ^ u) & (v ^ u) & 0x8000) != 0)
rS |= FLAGV;
if((u16int)v != 0)
rS &= ~FLAGZ;
break;
default:
v = (u64int)u - w - c;
if((v >> 32) != 0)
rS |= FLAGC;
if((v & 0x80000000) != 0)
rS |= FLAGN;
if(((w ^ u) & (v ^ u) & (1<<31)) != 0)
rS |= FLAGV;
if((u32int)v != 0)
rS &= ~FLAGZ;
break;
}
return v;
}
static int
cond(int n)
{
switch(n){
case 0: return 1; break;
default: return 0; break;
case 2: return (rS & (FLAGC|FLAGZ)) == 0; break;
case 3: return (rS & (FLAGC|FLAGZ)) != 0; break;
case 4: return (rS & FLAGC) == 0; break;
case 5: return (rS & FLAGC) != 0; break;
case 6: return (rS & FLAGZ) == 0; break;
case 7: return (rS & FLAGZ) != 0; break;
case 8: return (rS & FLAGV) == 0; break;
case 9: return (rS & FLAGV) != 0; break;
case 10: return (rS & FLAGN) == 0; break;
case 11: return (rS & FLAGN) != 0; break;
case 12: return ((rS ^ (rS << 2)) & FLAGN) == 0; break;
case 13: return ((rS ^ (rS << 2)) & FLAGN) != 0; break;
case 14: return ((rS ^ (rS << 2)) & FLAGN) == 0 && (rS & FLAGZ) == 0; break;
case 15: return ((rS ^ (rS << 2)) & FLAGN) != 0 || (rS & FLAGZ) != 0; break;
}
}
static u32int
rot(u32int v, int m, int n, int s)
{
int l, ll, x, vf;
u32int msb;
msb = 1 << ((8 << s) - 1);
v &= (msb << 1) - 1;
if(m == 0)
x = (v & msb) != 0;
else
x = 0;
if((m & 6) == 4)
ll = l = (rS & FLAGX) != 0;
else
ll = l = 0;
vf = 0;
while(n--){
if((m & 1) == 0){
l = v & 1;
v >>= 1;
}else{
l = (v & msb) != 0;
v <<= 1;
}
rS = rS & ~FLAGX | l << 4;
if(m >= 6)
x = l;
else if(m >= 4){
x = ll;
ll = l;
}
if((m & 1) == 0){
if(x != 0)
v |= msb;
}else
v |= x;
vf |= x ^ (v & msb) != 0;
tim += 2;
}
nz(v, s);
rS |= l;
if(m <= 1 && vf)
rS |= FLAGV;
tim += s == 2 ? 8 : 6;
return v;
}
static u8int
addbcd(u8int a, u8int b)
{
int r;
r = (a & 0xf) + (b & 0xf) + ((rS & FLAGX) != 0);
if(r > 0x09) r += 0x06;
if(r > 0x1f) r -= 0x10;
r += (a & 0xf0) + (b & 0xf0);
if(r > 0x9f) r += 0x60;
if((u8int)r != 0)
rS &= ~FLAGZ;
if(r > 0xff)
rS |= FLAGC|FLAGX;
else
rS &= ~(FLAGC|FLAGX);
return r;
}
static u8int
subbcd(u8int a, u8int b)
{
int x;
x = (a & 0xf) + (~b & 0xf) + ((rS & FLAGX) == 0);
if(x < 0x10) x -= 0x06;
if(x < 0) x += 0x10;
x += (a & 0xf0) + (~b & 0xf0);
if(x > 0xff)
rS &= ~(FLAGC|FLAGX);
else{
rS |= FLAGC|FLAGX;
x -= 0x60;
}
if((u8int)x != 0)
rS &= ~FLAGZ;
return x;
}
static void
dtime(u16int op, u8int s)
{
if((op & 0x100) != 0){
if(s == 2)
if((op & 0x30) == 0 || (op & 0x3f) == 0x3c)
tim += 8;
else
tim += 6;
else
tim += 4;
}else
tim += s == 2 ? 12 : 8;
}
static void
stime(int a, u8int s)
{
if(a)
tim += s == 2 ? 6 : 4;
else
tim += s == 2 ? 12 : 8;
}
static void
trap(int n, u32int pcv)
{
int l, v;
u32int sr, t;
sr = rS;
if(n < 0){
for(l = 7; l > ((rS >> 8) & 7); l--)
if((irql[l] & irq) != 0)
break;
v = intack(l);
rS = rS & ~0x700 | l << 8;
tim += 44;
}else{
switch(n){
case 2: case 3: tim += 50; break;
case 5: tim += 38; break;
case 6: tim += 40; break;
default: tim += 34; break;
}
v = n;
}
if((rS & FLAGS) == 0){
t = asp;
asp = ra[7];
ra[7] = t;
}
rS |= FLAGS;
push32(pcv);
push16(sr);
pc = memread(v * 4) << 16;
pc |= memread(v * 4 + 2);
stop = 0;
}
void
cpureset(void)
{
u32int v;
int i;
ra[7] = memread(0) << 16 | memread(2);
pc = memread(4) << 16 | memread(6);
rS = 0x2700;
for(i = 7, v = 0; i >= 0; i--){
irqla[i] = v;
v |= irql[i];
}
}
int
step(void)
{
u32int v, w;
vlong a;
int s;
int n, m, d;
static int cnt;
if(0 && pc == 0x4118c){
trace++;
print("%x\n", curpc);
}
tim = 0;
curpc = pc;
if(irq && (irqla[(rS >> 8) & 7] & irq) != 0){
trap(-1, curpc);
return tim;
}
if(stop)
return 1;
op = fetch16();
if(trace)
print("%.6ux %.6uo %.4ux %.8ux | %.8ux %.8ux %.8ux %.8ux | %.8ux %.8ux %.8ux\n", curpc, op, rS, memread(ra[7])<<16|memread(ra[7]+2), r[0], r[1], r[2], r[3], ra[0], ra[6], ra[7]);
s = op >> 6 & 3;
n = op >> 9 & 7;
switch(op >> 12){
case 0:
if((op & 0x3f) == 0x3c){ /* (ORI|ANDI|EORI) to (CCR|SR) */
if(s == 1 && (rS & FLAGS) == 0){
trap(8, curpc);
break;
}
v = rS;
w = fetch16();
switch(n){
case 0: v |= w; break;
case 1: v &= w; break;
case 5: v ^= w; break;
default: undef();
}
if(s != 1)
v = v & 0xff | rS & 0xff00;
rS = v;
if(s == 1 && (rS & FLAGS) == 0){
v = ra[7];
ra[7] = asp;
asp = v;
}
tim += 20;
break;
}
if((op & 0x138) == 0x108){ /* MOVEP */
a = ra[op & 7] + (s16int)fetch16();
switch(s){
case 0:
v = (u8int)rmode(a, 0) << 8;
v |= (u8int)rmode(a + 2, 0);
r[n] = r[n] & 0xff00 | v;
tim += 16;
break;
case 1:
v = (u8int)rmode(a, 0) << 24;
v |= (u8int)rmode(a + 2, 0) << 16;
v |= (u8int)rmode(a + 4, 0) << 8;
v |= (u8int)rmode(a + 6, 0);
tim += 24;
r[n] = v;
break;
case 2:
wmode(a, 0, r[n] >> 8);
wmode(a + 2, 0, r[n]);
tim += 16;
break;
case 3:
wmode(a, 0, r[n] >> 24);
wmode(a + 2, 0, r[n] >> 16);
wmode(a + 4, 0, r[n] >> 8);
wmode(a + 6, 0, r[n]);
tim += 24;
break;
}
break;
}
if((op & 0x100) != 0 || n == 4){ /* BTST, BCHG, BCLR, BSET */
if((op & 0x100) != 0)
w = r[n];
else
w = fetch16();
if((op & 0x38) != 0){
n = 0;
w = 1<<(w & 7);
}else{
n = 2;
w = 1<<(w & 31);
}
a = amode(op >> 3, op, n);
v = rmode(a, n);
rS &= ~FLAGZ;
if((v & w) == 0)
rS |= FLAGZ;
switch(s){
case 1: v ^= w; break;
case 2: v &= ~w; if(n == 2) tim += 2; break;
case 3: v |= w; break;
}
if(s != 0){
wmode(a, n, v);
tim += (op & 0x100) != 0 ? 8 : 12;
}else{
tim += (op & 0x100) != 0 ? 4 : 8;
if(n == 2)
tim += 2;
}
break;
}
switch(s){
case 0: w = (s8int)fetch16(); break;
default: w = fetch16(); break;
case 2: w = fetch32(); break;
}
a = amode(op >> 3, op, s);
v = rmode(a, s);
switch(n){
case 0: nz(v |= w, s); break;
case 1: nz(v &= w, s); break;
case 2: rS |= FLAGZ; v = sub(v, w, 0, s); break;
case 3: rS |= FLAGZ; v = add(v, w, 0, s); break;
case 5: nz(v ^= w, s); break;
case 6: rS |= FLAGZ; sub(v, w, 0, s); break;
default: undef();
}
if(a < 0)
tim += s == 2 ? (n == 1 || n == 6 ? 14 : 16) : 8;
else
tim += s == 2 ? 20 : 12;
if(n != 6)
wmode(a, s, v);
break;
case 1: /* MOVE */
s = 0;
goto move;
case 2:
s = 2;
goto move;
case 3:
s = 1;
move:
v = rmode(amode(op >> 3, op, s), s);
wmode(amode(op >> 6, op >> 9, s), s, v);
if((op & 0x1c0) != 0x40)
nz(v, s);
tim += 4;
break;
case 4:
if((op & 0x1c0) == 0x1c0){ /* LEA */
ra[n] = amode(op >> 3, op, 2);
break;
}
if((op & 0x1c0) == 0x180){ /* CHK */
a = amode(op >> 3, op, s);
v = rmode(a, s);
if((s32int)r[n] < 0 || (s32int)r[n] > (s32int)v)
trap(6, curpc);
else
tim += 10;
}
if((op & 0xb80) == 0x880 && (op & 0x38) >= 0x10){ /* MOVEM */
s = (op >> 6 & 1) + 1;
w = fetch16();
if((op & 0x38) == 0x18){
n = op & 7;
a = ra[n];
for(m = 0; m < 16; m++){
if((w & 1) != 0){
r[m] = rmode(a, s);
a += 1<<s;
tim += 2<<s;
}
w >>= 1;
}
ra[n] = a;
tim += 12;
break;
}
if((op & 0x38) == 0x20){
n = op & 7;
a = ra[n];
for(m = 0; m < 16; m++){
if((w & 1) != 0){
a -= 1<<s;
wmode(a, s, r[15 - m]);
tim += 2<<s;
}
w >>= 1;
}
ra[n] = a;
tim += 8;
break;
}
a = amode(op >> 3, op, s);
for(m = 0; m < 16; m++){
if((w & 1) != 0){
if((op & 0x400) != 0)
r[m] = rmode(a, s);
else
wmode(a, s, r[m]);
a += 1<<s;
tim += 2<<s;
}
w >>= 1;
}
tim += (op & 0x400) != 0 ? 8 : 12;
break;
}
switch(op >> 8 & 0xf){
case 0:
if(s == 3){ /* MOVE from SR */
if((rS & FLAGS) != 0){
a = amode(op >> 3, op, 1);
wmode(a, 1, rS);
tim += a < 0 ? 6 : 8;
}else
trap(8, curpc);
break;
} /* NEGX */
a = amode(op >> 3, op, s);
m = (rS & FLAGX) != 0;
d = 1<<(8<<s)-1;
v = rmode(a, s);
w = -(v+m) & (d << 1) - 1;
rS &= ~(FLAGC|FLAGX|FLAGN|FLAGV);
if((w & d) != 0)
rS |= FLAGN;
if(m && w == d)
rS |= FLAGV;
if(w != 0){
rS |= FLAGC|FLAGX;
rS &= ~FLAGZ;
}
wmode(a, s, w);
stime(a < 0, s);
break;
case 2: /* CLR */
a = amode(op >> 3, op, s);
wmode(a, s, 0);
nz(0, 0);
stime(a < 0, s);
break;
case 4:
if(s == 3){ /* MOVE to CCR */
rS = rS & 0xff00 | rmode(amode(op >> 3, op, 1), 1);
tim += 12;
break;
} /* NEG */
a = amode(op >> 3, op, s);
v = -rmode(a, s);
nz(v, s);
rS = rS & ~FLAGX | ~rS << 2 & FLAGX | ~rS >> 2 & FLAGC;
wmode(a, s, v);
stime(a < 0, s);
break;
case 6:
if(s == 3){ /* MOVE to SR */
if((rS & FLAGS) != 0){
rS = rmode(amode(op >> 3, op, 1), 1);
if((rS & FLAGS) == 0){
v = asp;
asp = ra[7];
ra[7] = v;
}
tim += 12;
}else
trap(8, curpc);
break;
} /* NOT */
a = amode(op >> 3, op, s);
v = ~rmode(a, s);
nz(v, s);
wmode(a, s, v);
stime(a < 0, s);
break;
case 8:
n = op & 7;
switch(s){
case 0: /* NBCD */
a = amode(op >> 3, op, 0);
v = rmode(a, 0);
wmode(a, 0, subbcd(0, v));
if(a < 0)
tim += 8;
else
tim += 6;
break;
case 1:
if((op >> 3 & 7) != 0){
push32(amode(op >> 3, op, 0)); /* PEA */
tim += 8;
}else{
nz(r[n] = r[n] >> 16 | r[n] << 16, 2); /* SWAP */
tim += 4;
}
break;
case 2: /* EXT */
nz(r[n] = r[n] & 0xffff0000 | (u16int)(s8int)r[n], 1);
tim += 4;
break;
case 3: /* EXT */
nz(r[n] = (s16int)r[n], 2);
tim += 4;
break;
}
break;
case 10:
if(s == 3){ /* TAS */
a = amode(op >> 3, op, 0);
v = rmode(a, 0);
nz(v, 0);
wmode(a, s, v | 0x80);
tim += a < 0 ? 4 : 14;
break;
} /* TST */
a = amode(op >> 3, op, s);
nz(rmode(a, s), s);
tim += 4;
break;
case 14:
v = op >> 4 & 0xf;
n = op & 7;
if(v == 4){ /* TRAP */
trap(0x20 | op & 0xf, pc);
break;
}else if(v == 5){
if((op & 8) == 0){ /* LINK */
push32(ra[n]);
ra[n] = ra[7];
ra[7] += (s16int)fetch16();
tim += 16;
}else{ /* UNLK */
ra[7] = ra[n];
ra[n] = pop32();
tim += 12;
}
break;
}else if(v == 6){ /* MOVE USP */
if((rS & FLAGS) != 0){
if((op & 8) != 0)
ra[n] = asp;
else
asp = ra[n];
tim += 4;
}else
trap(8, curpc);
break;
}
if((op & 0xc0) == 0xc0){ /* JMP */
pc = amode(op >> 3, op, 2);
tim += 4;
break;
}
if((op & 0xc0) == 0x80){ /* JSR */
a = amode(op >> 3, op, 2);
push32(pc);
pc = a;
tim += 12;
break;
}
switch(op){
case 0x4e70: tim += 132; break; /* RESET */
case 0x4e71: tim += 4; break; /* NOP */
case 0x4e72: /* STOP */
if((rS & FLAGS) != 0){
rS = fetch16();
stop = 1;
}else
trap(8, curpc);
tim += 4;
break;
case 0x4e73: /* RTE */
if((rS & FLAGS) != 0){
v = rS;
rS = pop16();
pc = pop32();
if(((v ^ rS) & FLAGS) != 0){
v = asp;
asp = ra[7];
ra[7] = v;
}
tim += 20;
}else
trap(8, curpc);
break;
case 0x4e75: pc = pop32(); tim += 16; break; /* RTS */
case 0x4e76: if((rS & FLAGV) != 0) trap(7, curpc); tim += 4; break; /* TRAPV */
case 0x4e77: /* RTR */
rS = rS & 0xff00 | pop16() & 0xff;
pc = pop32();
tim += 20;
break;
default: undef();
}
break;
default:
undef();
}
break;
case 5:
if((op & 0xf8) == 0xc8){ /* DBcc */
n = op & 7;
v = (s16int)fetch16();
if(!cond((op >> 8) & 0xf)){
if((u16int)r[n] != 0){
r[n]--;
pc = pc + v - 2;
tim += 10;
}else{
r[n] |= 0xffff;
tim += 14;
}
}else
tim += 12;
break;
}
if(s == 3){ /* Scc */
a = amode(op >> 3, op, 0);
v = cond(op >> 8 & 0xf);
wmode(a, 0, -v);
if(a < 0)
tim += 4 + 2 * v;
else
tim += 8;
break;
} /* ADDQ, SUBQ */
rS |= FLAGZ;
if((op & 0x38) == 0x08)
s = 2;
a = amode(op >> 3, op, s);
v = rmode(a, s);
if(n == 0)
n = 8;
if((op & 0x100) == 0)
v = add(v, n, 0, s);
else
v = sub(v, n, 0, s);
rS = rS & ~FLAGX | rS << 4 & FLAGX;
if(a < 0)
tim += s == 2 || (op & 0x130) == 0x110 ? 8 : 4;
else
tim += s == 2 ? 12 : 8;
wmode(a, s, v);
break;
case 6: /* BRA */
v = (s8int)op;
if(v == 0)
v = (s16int)fetch16();
else if(v == (u32int)-1)
v = fetch32();
if((op & 0xf00) == 0x100){ /* BSR */
push32(pc);
pc = curpc + 2 + v;
tim += 18;
break;
}
if(cond((op >> 8) & 0xf)){
pc = curpc + 2 + v;
tim += 10;
}else
tim += (u8int)(op + 1) <= 1 ? 12 : 8;
break;
case 7: /* MOVEQ */
r[n] = (s8int)op;
nz(r[n], 0);
tim += 4;
break;
case 8:
if(s == 3){ /* DIVU, DIVS */
a = amode(op >> 3, op, 1);
v = rmode(a, 1);
if(v == 0){
trap(5, curpc);
break;
}
if((op & 0x100) != 0){
w = (s32int)r[n] % (s16int)v;
v = (s32int)r[n] / (s16int)v;
if(((s16int)w ^ (s16int)v) < 0)
w = -w;
if(v != (u32int)(s16int)v){
rS = rS & ~FLAGC | FLAGV;
break;
}
tim += 158;
}else{
w = r[n] % (u16int)v;
v = r[n] / (u16int)v;
if(v >= 0x10000){
rS = rS & ~FLAGC | FLAGV;
break;
}
tim += 140;
}
r[n] = (u16int)v | w << 16;
nz(v, 1);
break;
}
if((op & 0x1f0) == 0x100){ /* SBCD */
n = (op >> 9) & 7;
m = op & 7;
if((op & 8) != 0){
a = amode(4, n, 0);
v = rmode(a, 0);
w = rmode(amode(4, m, 0), 0);
v = subbcd(v, w);
wmode(a, 0, v);
tim += 18;
}else{
r[n] = r[n] & 0xffffff00 | subbcd((u8int)r[n], (u8int)r[m]);
tim += 6;
}
break;
}
logic: /* OR, EOR, AND */
a = amode(op >> 3, op, s);
n = (op >> 9) & 7;
v = rmode(a, s);
switch(op >> 12){
case 8: v |= r[n]; break;
case 11: v ^= r[n]; break;
case 12: v &= r[n]; break;
}
if((op & 0x100) == 0)
a = ~n;
wmode(a, s, v);
nz(v, s);
dtime(op, s);
break;
case 11:
if(s == 3){ /* CMPA */
s = (op >> 8 & 1) + 1;
a = amode(op >> 3, op, s);
rS |= FLAGZ;
sub(ra[n], rmode(a, s), 0, 2);
tim += 6;
break;
}
if((op & 0x138) == 0x108){ /* CMPM */
m = op & 7;
rS |= FLAGZ;
sub(rmode(amode(3, n, s), s), rmode(amode(3, m, s), s), 0, s);
tim += s == 2 ? 20 : 12;
break;
}
if((op & 0x100) == 0){ /* CMP */
a = amode(op >> 3, op, s);
rS |= FLAGZ;
sub(r[n], rmode(a, s), 0, s);
tim += s == 2 ? 6 : 4;
break;
}
goto logic;
case 12:
if(s == 3){ /* MULU, MULS */
a = amode(op >> 3, op, 1);
v = rmode(a, 1);
if((op & 0x100) != 0)
v *= (s16int)r[n];
else
v = (u16int)v * (u16int)r[n];
r[n] = v;
nz(v, 1);
tim += 70;
break;
}
if((op & 0x1f0) == 0x100){ /* ABCD */
n = (op >> 9) & 7;
m = op & 7;
if((op & 8) != 0){
a = amode(4, n, 0);
v = rmode(a, 0);
w = rmode(amode(4, m, 0), 0);
v = addbcd(v, w);
wmode(a, 0, v);
tim += 18;
}else{
r[n] = r[n] & 0xffffff00 | addbcd((u8int)r[n], (u8int)r[m]);
tim += 6;
}
break;
}
if((op & 0x130) == 0x100){ /* EXG */
m = op & 0xf;
if((op & 0xc8) == 0x48)
n |= 8;
v = r[n];
r[n] = r[m];
r[m] = v;
tim += 6;
break;
}
goto logic;
case 9:
case 13:
if(s == 3){ /* ADDA, SUBA */
if((op & 0x100) != 0){
s = 2;
tim += 6;
}else{
s = 1;
tim += 8;
}
a = amode(op >> 3, op, s);
if((op >> 12) == 13)
ra[n] += rmode(a, s);
else
ra[n] -= rmode(a, s);
break;
}
if((op & 0x130) == 0x100){ /* ADDX, SUBX */
m = op & 7;
if((op & 8) != 0){
a = ra[n] -= 1<<s;
v = rmode(a, s);
w = rmode(ra[m] -= 1<<s, s);
tim += s == 2 ? 30 : 18;
}else{
v = r[n];
w = r[m];
a = ~n;
tim += s == 2 ? 8 : 4;
}
if((op >> 12) == 13)
v = add(v, w, (rS & FLAGX) != 0, s);
else
v = sub(v, w, (rS & FLAGX) != 0, s);
wmode(a, s, v);
rS = rS & ~FLAGX | rS << 4 & FLAGX;
break;
} /* ADD, SUB */
a = amode(op >> 3, op, s);
rS |= FLAGZ;
d = (op & 0x100) == 0;
v = rmode(a, s);
if((op >> 12) == 13)
v = add(v, r[n], 0, s);
else
v = sub(d ? r[n] : v, d ? v : r[n], 0, s);
rS = rS & ~FLAGX | rS << 4 & FLAGX;
if(d)
a = ~n;
wmode(a, s, v);
dtime(op, s);
break;
case 14: /* shifts */
if(s == 3){
m = op >> 8 & 7;
n = 1;
s = 1;
a = amode(op >> 3, op, s);
}else{
a = ~(uvlong)(op & 7);
m = op >> 2 & 6 | op >> 8 & 1;
n = (op >> 9) & 7;
if((op & 0x20) != 0)
n = r[n] & 63;
else if(n == 0)
n = 8;
}
wmode(a, s, rot(rmode(a, s), m, n, s));
break;
case 10:
trap(10, curpc);
break;
case 15:
trap(11, curpc);
break;
default:
undef();
}
return tim;
}