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games/md: copy updated cpu.c from blit

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This commit is contained in:
aiju 2017-04-27 08:46:44 +00:00
parent 8d3bbf373c
commit 66c22f3908
1 changed files with 14 additions and 11 deletions
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25
sys/src/games/md/cpu.c
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@ -344,7 +344,7 @@ 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)
@ -458,12 +458,11 @@ trap(int n, u32int pcv)
sr = rS;
if(n < 0){
for(l = 7; l >= ((rS >> 8) & 7); l--)
for(l = 7; l > ((rS >> 8) & 7); l--)
if((irql[l] & irq) != 0)
break;
v = intack(l);
rS = rS & ~0x700 | l << 8;
irq = 0;
tim += 44;
}else{
switch(n){
@ -496,8 +495,10 @@ cpureset(void)
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 |= irql[i];
for(i = 7, v = 0; i >= 0; i--){
irqla[i] = v;
v |= irql[i];
}
}
int
@ -509,7 +510,7 @@ step(void)
int n, m, d;
static int cnt;
if(0 && pc == 0x59500){
if(0 && pc == 0x4118c){
trace++;
print("%x\n", curpc);
}
@ -523,7 +524,7 @@ step(void)
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[1], ra[7]);
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){
@ -729,7 +730,7 @@ step(void)
a = amode(op >> 3, op, s);
m = (rS & FLAGX) != 0;
d = 1<<(8<<s)-1;
v = -rmode(a, s);
v = rmode(a, s);
w = -(v+m) & (d << 1) - 1;
rS &= ~(FLAGC|FLAGX|FLAGN|FLAGV);
if((w & d) != 0)
@ -740,7 +741,7 @@ step(void)
rS |= FLAGC|FLAGX;
rS &= ~FLAGZ;
}
wmode(a, s, v);
wmode(a, s, w);
stime(a < 0, s);
break;
case 2: /* CLR */
@ -758,6 +759,7 @@ step(void)
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;
@ -943,6 +945,7 @@ step(void)
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
@ -1134,7 +1137,7 @@ step(void)
else
v = sub(v, w, (rS & FLAGX) != 0, s);
wmode(a, s, v);
rS = rS & ~FLAGX | rS & FLAGC << 4;
rS = rS & ~FLAGX | rS << 4 & FLAGX;
break;
} /* ADD, SUB */
a = amode(op >> 3, op, s);
@ -1145,7 +1148,7 @@ step(void)
v = add(v, r[n], 0, s);
else
v = sub(d ? r[n] : v, d ? v : r[n], 0, s);
rS = rS & ~FLAGX | rS & FLAGC << 4;
rS = rS & ~FLAGX | rS << 4 & FLAGX;
if(d)
a = ~n;
wmode(a, s, v);