added gb emulator prototype

front
aiju 2012-04-05 19:11:26 +02:00
parent 2aa121fd6c
commit e9854eb12b
10 changed files with 2703 additions and 0 deletions

843
sys/src/games/gb/cpu.c Normal file
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@ -0,0 +1,843 @@
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
#define lohi(L, H) (((u16int)L) | (((u16int)H) << 8))
u8int R[8], Fl;
u16int pc, sp, curpc;
int halt, IME, nobios;
static void
invalid(void)
{
sysfatal("invalid instruction %.2x (pc = %.4x)", memread(curpc), curpc);
}
static u8int
fetch8(void)
{
return memread(pc++);
}
static u16int
fetch16(void)
{
u16int r;
r = lohi(memread(pc), memread(pc+1));
pc += 2;
return r;
}
static void
push8(u8int n)
{
memwrite(--sp, n);
}
static void
push16(u16int n)
{
memwrite(--sp, n >> 8);
memwrite(--sp, n);
}
static u8int
pop8(void)
{
return memread(sp++);
}
static u16int
pop16(void)
{
u8int a, b;
b = pop8();
a = pop8();
return lohi(b, a);
}
static int
ld01(u8int op)
{
u8int val, a, b;
int time;
a = (op & 0x38) >> 3;
b = op & 7;
time = 4;
if(a == rHL && b == rHL){
halt = 1;
return 4;
}
if(b == rHL){
val = memread(lohi(R[rL], R[rH]));
time = 8;
}else{
val = R[b];
}
if(a == rHL){
memwrite(lohi(R[rL], R[rH]), val);
time = 8;
}else{
R[a] = val;
}
return time;
}
static int
ldi(u8int op)
{
u8int val, a;
val = fetch8();
a = (op & 0x38) >> 3;
if(a == rHL){
memwrite(lohi(R[rL], R[rH]), val);
return 12;
}else{
R[a] = val;
return 8;
}
}
static int
ld16(u8int op)
{
u16int val;
u8int a;
val = fetch16();
a = (op & 0x30) >> 4;
switch(a){
case 0:
R[rB] = val >> 8;
R[rC] = val;
break;
case 1:
R[rD] = val >> 8;
R[rE] = val;
break;
case 2:
R[rH] = val >> 8;
R[rL] = val;
break;
case 3:
sp = val;
break;
}
return 12;
}
static int
add16(u8int op)
{
u16int val1, val2;
u8int a;
u32int val32;
a = (op & 0x30) >> 4;
switch(a){
case 0:
val1 = lohi(R[rC], R[rB]);
break;
case 1:
val1 = lohi(R[rE], R[rD]);
break;
case 2:
val1 = lohi(R[rL], R[rH]);
break;
default:
val1 = sp;
}
Fl &= FLAGZ;
val2 = lohi(R[rL], R[rH]);
val32 = (u32int)(val1) + (u32int)(val2);
if(val32 > 0xFFFF)
Fl |= FLAGC;
if(((val1&0xFFF)+(val2&0xFFF)) > 0xFFF)
Fl |= FLAGH;
R[rL] = val32;
R[rH] = val32 >> 8;
return 8;
}
static int
ldin(u8int op)
{
u16int addr;
switch(op >> 4){
case 0:
addr = lohi(R[rC], R[rB]);
break;
case 1:
addr = lohi(R[rE], R[rD]);
break;
default:
addr = lohi(R[rL], R[rH]);
}
if(op & 8){
R[rA] = memread(addr);
}else{
memwrite(addr, R[rA]);
}
if((op >> 4) > 1){
if(op & 16)
addr--;
else
addr++;
R[rL] = addr;
R[rH] = addr >> 8;
}
return 8;
}
static int
inc16(u8int op)
{
u16int val;
u8int a;
a = (op & 0x38) >> 3;
switch(a >> 1){
case 0:
val = lohi(R[rC], R[rB]);
break;
case 1:
val = lohi(R[rE], R[rD]);
break;
case 2:
val = lohi(R[rL], R[rH]);
break;
default:
val = sp;
}
if(a & 1)
val--;
else
val++;
switch(a >> 1){
case 0:
R[rB] = val >> 8;
R[rC] = val;
break;
case 1:
R[rD] = val >> 8;
R[rE] = val;
break;
case 2:
R[rH] = val >> 8;
R[rL] = val;
break;
default:
sp = val;
}
return 8;
}
static int
inc8(u8int op)
{
u8int val, a;
int time;
a = (op & 0x38) >> 3;
if(a == rHL){
val = memread(lohi(R[rL], R[rH]));
time = 12;
}else{
val = R[a];
time = 4;
}
if(a == rHL){
memwrite(lohi(R[rL], R[rH]), val+1);
}else{
R[a] = val + 1;
}
Fl &= FLAGC;
if(val == 0xFF)
Fl |= FLAGZ;
if((val & 0xF) == 0xF)
Fl |= FLAGH;
return time;
}
static int
dec8(u8int op)
{
u8int val, a;
int time;
a = (op & 0x38) >> 3;
if(a == rHL){
val = memread(lohi(R[rL], R[rH]));
time = 12;
}else{
val = R[a];
time = 4;
}
if(a == rHL){
memwrite(lohi(R[rL], R[rH]), val - 1);
}else{
R[a] = val - 1;
}
Fl = (Fl & FLAGC) | FLAGN;
if(val == 1)
Fl |= FLAGZ;
if((val & 0xF) == 0)
Fl |= FLAGH;
return time;
}
static int
alu(u8int op)
{
u8int val4, val8, a, b;
short val16;
int time;
a = op & 7;
b = (op & 0x38) >> 3;
if((op >> 6) == 3){
val8 = fetch8();
time = 8;
}else if(a == rHL){
val8 = memread(lohi(R[rL], R[rH]));
time = 8;
}else{
val8 = R[a];
time = 4;
}
switch(b){
case 0:
case 1:
val16 = (ushort)(R[rA]) + (ushort)(val8);
val4 = (R[rA] & 0xF) + (val8 & 0xF);
if(b == 1 && (Fl & FLAGC)){
val16++;
val4++;
}
Fl = 0;
val8 = val16;
if(val16 >= 0x100)
Fl |= FLAGC;
if(val4 >= 0x10)
Fl |= FLAGH;
break;
case 2:
case 3:
case 7:
val16 = (ushort)R[rA];
val16 -= (ushort)val8;
val4 = val8 & 0xF;
if(b == 3 && (Fl & FLAGC)){
val16--;
val4++;
}
val8 = val16;
Fl = FLAGN;
if(val16 < 0)
Fl |= FLAGC;
if(val4 > (R[rA] & 0xF))
Fl |= FLAGH;
break;
case 4:
val8 &= R[rA];
Fl = FLAGH;
break;
case 5:
val8 ^= R[rA];
Fl = 0;
break;
default:
Fl = 0;
val8 |= R[rA];
}
if(val8 == 0)
Fl |= FLAGZ;
if(b != 7)
R[rA] = val8;
return time;
}
static int
jr(u8int op)
{
u8int a;
u16int addr;
short step;
a = (op & 0x38) >> 3;
switch(a){
case 0:
return 4;
case 1:
addr = fetch16();
memwrite(addr, sp);
memwrite(addr + 1, sp >> 8);
return 8;
}
step = (short)(schar)fetch8();
switch(a){
case 2:
return 4;
case 4:
if(Fl & FLAGZ)
return 8;
break;
case 5:
if((Fl & FLAGZ) == 0)
return 8;
break;
case 6:
if(Fl & FLAGC)
return 8;
break;
case 7:
if((Fl & FLAGC) == 0)
return 8;
}
pc += step;
return 8;
}
static int
jp(u8int op)
{
u16int addr;
addr = fetch16();
if(op != 0xC3){
switch((op & 0x38) >> 3){
case 0:
if(Fl & FLAGZ)
return 12;
break;
case 1:
if((Fl & FLAGZ) == 0)
return 12;
break;
case 2:
if(Fl & FLAGC)
return 12;
break;
case 3:
if((Fl & FLAGC) == 0)
return 12;
break;
}
}
pc = addr;
return 12;
}
static int
call(u8int op)
{
u16int addr;
addr = fetch16();
if(op != 0xCD){
switch((op & 0x38) >> 3){
case 0:
if(Fl & FLAGZ)
return 12;
break;
case 1:
if((Fl & FLAGZ) == 0)
return 12;
break;
case 2:
if(Fl & FLAGC)
return 12;
break;
case 3:
if((Fl & FLAGC) == 0)
return 12;
break;
}
}
push16(pc);
pc = addr;
return 12;
}
static int
rst(u8int op)
{
u16int addr;
addr = op & 0x38;
push16(pc);
pc = addr;
return 32;
}
static int
ret(u8int op)
{
if(op != 0xC9 && op!= 0xD9){
switch((op & 0x38) >> 3){
case 0:
if(Fl & FLAGZ)
return 8;
break;
case 1:
if((Fl & FLAGZ) == 0)
return 8;
break;
case 2:
if(Fl & FLAGC)
return 8;
break;
case 3:
if((Fl & FLAGC) == 0)
return 8;
break;
}
}
pc = pop16();
if(op == 0xD9)
IME = 1;
return 8;
}
static int
push(u8int op)
{
u8int a;
a = (op & 0x38) >> 4;
switch(a){
case 0:
push8(R[rB]);
push8(R[rC]);
break;
case 1:
push8(R[rD]);
push8(R[rE]);
break;
case 2:
push8(R[rH]);
push8(R[rL]);
break;
default:
push8(R[rA]);
push8(Fl);
break;
}
return 16;
}
static int
pop(u8int op)
{
u8int a;
a = (op & 0x38) >> 4;
switch(a){
case 0:
R[rC] = pop8();
R[rB] = pop8();
break;
case 1:
R[rE] = pop8();
R[rD] = pop8();
break;
case 2:
R[rL] = pop8();
R[rH] = pop8();
break;
default:
Fl = pop8() & 0xF0;
R[rA] = pop8();
}
return 12;
}
static int
shift(u8int op, int cb)
{
u16int val;
u8int a, b;
int time;
a = (op & 0x38) >> 3;
b = op & 7;
if(b == rHL){
val = memread(lohi(R[rL], R[rH]));
time = 16;
}else{
val = R[b];
time = 8;
}
switch(a){
case 0:
Fl = 0;
if(val & 0x80)
Fl = FLAGC;
val = (val << 1) | (val >> 7);
break;
case 1:
Fl = 0;
if(val & 1)
Fl = FLAGC;
val = (val >> 1) | (val << 7);
break;
case 2:
val <<= 1;
if(Fl & FLAGC)
val |= 1;
Fl = 0;
if(val & 0x100)
Fl = FLAGC;
break;
case 3:
if(Fl & FLAGC)
val |= 0x100;
Fl = 0;
if(val & 1)
Fl = FLAGC;
val >>= 1;
break;
case 4:
Fl = 0;
if(val & 0x80)
Fl = FLAGC;
val <<= 1;
break;
case 5:
Fl = 0;
if(val & 1)
Fl = FLAGC;
val = (val >> 1) | (val & 0x80);
break;
case 6:
val = (val << 4) | (val >> 4);
Fl = 0;
break;
default:
Fl = 0;
if(val & 1)
Fl = FLAGC;
val >>= 1;
}
if((val & 0xFF) == 0)
Fl |= FLAGZ;
if(b == rHL)
memwrite(lohi(R[rL], R[rH]), val);
else
R[b] = val;
if(!cb)
Fl &= FLAGC;
return time;
}
static int
bit(u8int op)
{
u8int val, a, b;
int time;
a = (op & 0x38) >> 3;
b = op & 7;
if(b == rHL){
val = memread(lohi(R[rL], R[rH])),
time = 16;
}else{
val = R[b];
time = 8;
}
Fl = (Fl & FLAGC) | FLAGH;
if((val & (1<<a)) == 0)
Fl |= FLAGZ;
return time;
}
static int
setres(u8int op)
{
u8int val, a, b;
int time;
a = (op & 0x38) >> 3;
b = op & 7;
if(b == rHL){
val = memread(lohi(R[rL], R[rH]));
time = 16;
}else{
val = R[b];
time = 8;
}
if(op & 0x40)
val |= (1 << a);
else
val &= ~(1 << a);
if(b == rHL)
memwrite(lohi(R[rL], R[rH]), val);
else
R[b] = val;
return time;
}
static int
cb(void)
{
u8int op;
op = fetch8();
if((op & 0xC0) == 0)
return shift(op, 1);
if((op & 0xC0) == 0x40)
return bit(op);
return setres(op);
}
void
interrupt(u8int t)
{
mem[IF] |= (1 << t);
}
int
step(void)
{
u8int op;
ushort val;
extern u8int daa[];
int val32, i;
if(halt){
if(mem[IF] & mem[IE])
halt = 0;
else
return 4;
}
if(IME && (mem[IF] & mem[IE]))
for(i = 0; i < 5; i++)
if(mem[IF] & mem[IE] & (1<<i)){
mem[IF] &= ~(1<<i);
push16(pc);
IME = 0;
halt = 0;
pc = 0x40 + 8 * i;
break;
}
curpc = pc;
op = fetch8();
if(0){
print("%.4x A %.2x B %.2x C %.2x D %.2x E %.2x HL %.2x%.2x SP %.4x F %.2x ", curpc, R[rA], R[rB], R[rC], R[rD], R[rE], R[rH], R[rL], sp, Fl);
disasm(curpc);
}
if((op & 0xC7) == 0x00)
return jr(op);
if((op & 0xCF) == 0x01)
return ld16(op);
if((op & 0xCF) == 0x09)
return add16(op);
if((op & 0xC7) == 0x02)
return ldin(op);
if((op & 0xC7) == 0x03)
return inc16(op);
if((op & 0xC7) == 0x04)
return inc8(op);
if((op & 0xC7) == 0x05)
return dec8(op);
if((op & 0xC7) == 0x06)
return ldi(op);
if((op & 0xE7) == 0x07)
return shift(op, 0);
if((op & 0xC0) == 0x40)
return ld01(op);
if((op & 0xC0) == 0x80 || (op & 0xC7) == 0xC6)
return alu(op);
if((op & 0xE7) == 0xC0 || op == 0xC9 || op == 0xD9)
return ret(op);
if((op & 0xCF) == 0xC1)
return pop(op);
if((op & 0xE7) == 0xC2 || op == 0xC3)
return jp(op);
if((op & 0xE7) == 0xC4 || op == 0xCD)
return call(op);
if((op & 0xCF) == 0xC5)
return push(op);
if((op & 0xC7) == 0xC7)
return rst(op);
switch(op){
case 0x27:
i = (((int)R[rA]) + (((int)Fl) * 16)) * 2;
R[rA] = daa[i];
Fl = daa[i+1];
return 4;
case 0x2F:
R[rA] = ~R[rA];
Fl |= FLAGN | FLAGH;
return 4;
case 0x37:
Fl = (Fl & FLAGZ) | FLAGC;
return 4;
case 0x3F:
Fl &= FLAGZ | FLAGC;
Fl ^= FLAGC;
return 4;
case 0xE0:
memwrite(lohi(fetch8(), 0xFF), R[rA]);
return 8;
case 0xE2:
memwrite(lohi(R[rC], 0xFF), R[rA]);
return 8;
case 0xE8:
val = (schar)fetch8();
val32 = (int)sp + val;
Fl = 0;
if(val32 > 0xFFFF || val32 < 0)
Fl |= FLAGC;
if(((sp & 0xFFF) + (val & 0xFFF)) > 0xFFF)
Fl |= FLAGH;
sp = val;
return 16;
case 0xE9:
pc = lohi(R[rL], R[rH]);
return 4;
case 0xEA:
memwrite(fetch16(), R[rA]);
return 16;
case 0xF0:
R[rA] = memread(lohi(fetch8(), 0xFF));
return 12;
case 0xFA:
R[rA] = memread(fetch16());
return 16;
case 0xF2:
R[rA] = memread(lohi(R[rC], 0xFF));
return 8;
case 0xCB:
return cb();
case 0xF3:
IME= 0;
return 4;
case 0xF8:
val32 = sp + (schar)fetch8();
R[rL] = val32;
R[rH] = val32 >> 8;
Fl = 0;
if(val32 < 0 || val32 > 0xFFFF)
Fl = FLAGC;
return 12;
case 0xF9:
sp = lohi(R[rL], R[rH]);
return 8;
case 0xFB:
IME = 1;
return 4;
default:
invalid();
}
return 0;
}

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sys/src/games/gb/daa.c Normal file
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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
u8int daa[] = {
0x00, 0x80, 0x01, 0x00, 0x02, 0x00, 0x03, 0x00, 0x04, 0x00, 0x05, 0x00, 0x06, 0x00, 0x07, 0x00, 0x08, 0x00,
0x09, 0x00, 0x10, 0x00, 0x11, 0x00, 0x12, 0x00, 0x13, 0x00, 0x14, 0x00, 0x15, 0x00, 0x10, 0x00, 0x11, 0x00,
0x12, 0x00, 0x13, 0x00, 0x14, 0x00, 0x15, 0x00, 0x16, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19, 0x00, 0x20, 0x00,
0x21, 0x00, 0x22, 0x00, 0x23, 0x00, 0x24, 0x00, 0x25, 0x00, 0x20, 0x00, 0x21, 0x00, 0x22, 0x00, 0x23, 0x00,
0x24, 0x00, 0x25, 0x00, 0x26, 0x00, 0x27, 0x00, 0x28, 0x00, 0x29, 0x00, 0x30, 0x00, 0x31, 0x00, 0x32, 0x00,
0x33, 0x00, 0x34, 0x00, 0x35, 0x00, 0x30, 0x00, 0x31, 0x00, 0x32, 0x00, 0x33, 0x00, 0x34, 0x00, 0x35, 0x00,
0x36, 0x00, 0x37, 0x00, 0x38, 0x00, 0x39, 0x00, 0x40, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44, 0x00,
0x45, 0x00, 0x40, 0x00, 0x41, 0x00, 0x42, 0x00, 0x43, 0x00, 0x44, 0x00, 0x45, 0x00, 0x46, 0x00, 0x47, 0x00,
0x48, 0x00, 0x49, 0x00, 0x50, 0x00, 0x51, 0x00, 0x52, 0x00, 0x53, 0x00, 0x54, 0x00, 0x55, 0x00, 0x50, 0x00,
0x51, 0x00, 0x52, 0x00, 0x53, 0x00, 0x54, 0x00, 0x55, 0x00, 0x56, 0x00, 0x57, 0x00, 0x58, 0x00, 0x59, 0x00,
0x60, 0x00, 0x61, 0x00, 0x62, 0x00, 0x63, 0x00, 0x64, 0x00, 0x65, 0x00, 0x60, 0x00, 0x61, 0x00, 0x62, 0x00,
0x63, 0x00, 0x64, 0x00, 0x65, 0x00, 0x66, 0x00, 0x67, 0x00, 0x68, 0x00, 0x69, 0x00, 0x70, 0x00, 0x71, 0x00,
0x72, 0x00, 0x73, 0x00, 0x74, 0x00, 0x75, 0x00, 0x70, 0x00, 0x71, 0x00, 0x72, 0x00, 0x73, 0x00, 0x74, 0x00,
0x75, 0x00, 0x76, 0x00, 0x77, 0x00, 0x78, 0x00, 0x79, 0x00, 0x80, 0x00, 0x81, 0x00, 0x82, 0x00, 0x83, 0x00,
0x84, 0x00, 0x85, 0x00, 0x80, 0x00, 0x81, 0x00, 0x82, 0x00, 0x83, 0x00, 0x84, 0x00, 0x85, 0x00, 0x86, 0x00,
0x87, 0x00, 0x88, 0x00, 0x89, 0x00, 0x90, 0x00, 0x91, 0x00, 0x92, 0x00, 0x93, 0x00, 0x94, 0x00, 0x95, 0x00,
0x90, 0x00, 0x91, 0x00, 0x92, 0x00, 0x93, 0x00, 0x94, 0x00, 0x95, 0x00, 0x96, 0x00, 0x97, 0x00, 0x98, 0x00,
0x99, 0x00, 0x00, 0x90, 0x01, 0x10, 0x02, 0x10, 0x03, 0x10, 0x04, 0x10, 0x05, 0x10, 0x00, 0x90, 0x01, 0x10,
0x02, 0x10, 0x03, 0x10, 0x04, 0x10, 0x05, 0x10, 0x06, 0x10, 0x07, 0x10, 0x08, 0x10, 0x09, 0x10, 0x10, 0x10,
0x11, 0x10, 0x12, 0x10, 0x13, 0x10, 0x14, 0x10, 0x15, 0x10, 0x10, 0x10, 0x11, 0x10, 0x12, 0x10, 0x13, 0x10,
0x14, 0x10, 0x15, 0x10, 0x16, 0x10, 0x17, 0x10, 0x18, 0x10, 0x19, 0x10, 0x20, 0x10, 0x21, 0x10, 0x22, 0x10,
0x23, 0x10, 0x24, 0x10, 0x25, 0x10, 0x20, 0x10, 0x21, 0x10, 0x22, 0x10, 0x23, 0x10, 0x24, 0x10, 0x25, 0x10,
0x26, 0x10, 0x27, 0x10, 0x28, 0x10, 0x29, 0x10, 0x30, 0x10, 0x31, 0x10, 0x32, 0x10, 0x33, 0x10, 0x34, 0x10,
0x35, 0x10, 0x30, 0x10, 0x31, 0x10, 0x32, 0x10, 0x33, 0x10, 0x34, 0x10, 0x35, 0x10, 0x36, 0x10, 0x37, 0x10,
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0x36, 0x50, 0x37, 0x50, 0x38, 0x50, 0x39, 0x50, 0x3A, 0x50, 0x3B, 0x50, 0x3C, 0x50, 0x3D, 0x50, 0x3E, 0x50,
0x3F, 0x50, 0x40, 0x50, 0x41, 0x50, 0x42, 0x50, 0x43, 0x50, 0x44, 0x50, 0x45, 0x50, 0x46, 0x50, 0x47, 0x50,
0x48, 0x50, 0x49, 0x50, 0x4A, 0x50, 0x4B, 0x50, 0x4C, 0x50, 0x4D, 0x50, 0x4E, 0x50, 0x4F, 0x50, 0x50, 0x50,
0x51, 0x50, 0x52, 0x50, 0x53, 0x50, 0x54, 0x50, 0x55, 0x50, 0x56, 0x50, 0x57, 0x50, 0x58, 0x50, 0x59, 0x50,
0x5A, 0x50, 0x5B, 0x50, 0x5C, 0x50, 0x5D, 0x50, 0x5E, 0x50, 0x5F, 0x50, 0x60, 0x50, 0x61, 0x50, 0x62, 0x50,
0x63, 0x50, 0x64, 0x50, 0x65, 0x50, 0x66, 0x50, 0x67, 0x50, 0x68, 0x50, 0x69, 0x50, 0x6A, 0x50, 0x6B, 0x50,
0x6C, 0x50, 0x6D, 0x50, 0x6E, 0x50, 0x6F, 0x50, 0x70, 0x50, 0x71, 0x50, 0x72, 0x50, 0x73, 0x50, 0x74, 0x50,
0x75, 0x50, 0x76, 0x50, 0x77, 0x50, 0x78, 0x50, 0x79, 0x50, 0x7A, 0x50, 0x7B, 0x50, 0x7C, 0x50, 0x7D, 0x50,
0x7E, 0x50, 0x7F, 0x50, 0x80, 0x50, 0x81, 0x50, 0x82, 0x50, 0x83, 0x50, 0x84, 0x50, 0x85, 0x50, 0x86, 0x50,
0x87, 0x50, 0x88, 0x50, 0x89, 0x50, 0x8A, 0x50, 0x8B, 0x50, 0x8C, 0x50, 0x8D, 0x50, 0x8E, 0x50, 0x8F, 0x50,
0x90, 0x50, 0x91, 0x50, 0x92, 0x50, 0x93, 0x50, 0x94, 0x50, 0x95, 0x50, 0x96, 0x50, 0x97, 0x50, 0x98, 0x50,
0x99, 0x50
};

73
sys/src/games/gb/dat.h Normal file
View File

@ -0,0 +1,73 @@
extern u16int pc, curpc, sp;
extern u8int R[8], Fl;
extern int halt, IME, bank, keys;
extern int clock, ppuclock, divclock, timerclock, syncclock, timerfreq, timer;
extern uchar mem[];
extern uchar *cart;
extern int mbc, rombanks, rambanks;
enum {
rB,
rC,
rD,
rE,
rH,
rL,
rHL,
rA
};
enum {
FLAGC = 0x10,
FLAGH = 0x20,
FLAGN = 0x40,
FLAGZ = 0x80,
};
enum {
/* interrupt types */
INTVBLANK = 0,
INTLCDC = 1,
INTTIMER = 2,
INTSIO = 3,
INTIRQ = 4,
/* I/O registers */
DIV = 0xFF04,
TIMA = 0xFF05,
TMA = 0xFF06,
TAC = 0xFF07,
LY = 0xFF44,
LCDC = 0xFF40,
STAT = 0xFF41,
SCY = 0xFF42,
SCX = 0xFF43,
LYC = 0xFF45,
BGP = 0xFF47,
OBP0 = 0xFF48,
OBP1 = 0xFF49,
WY = 0xFF4A,
WX = 0xFF4B,
/* LCDC */
BGDISP = 1,
SPRITEDISP = 2,
SPRITE16 = 4,
BGTILEMAP = 8,
BGTILEDATA = 16,
WINDOWDISP = 32,
WINDOWTILEMAP = 64,
LCDOP = 128,
/* LCD STAT */
MODEHBLANK = 0,
MODEVBLANK = 1,
MODEOAM = 2,
MODELCD = 3,
/* others */
IF = 0xFF0F,
IE = 0xFFFF,
CPUFREQ = 4194304,
};

811
sys/src/games/gb/disasm.c Normal file
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@ -0,0 +1,811 @@
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
static char *opcodes[256] = {
[0x00] "NOP",
[0x01] "LD BC,%.4x",
[0x02] "LD (BC),A",
[0x03] "INC BC",
[0x04] "INC B",
[0x05] "DEC B",
[0x06] "LD B,%.2x",
[0x07] "RLCA ",
[0x08] "LD (%.4x),SP",
[0x09] "ADD HL,BC",
[0x0A] "LD A,(BC)",
[0x0B] "DEC BC",
[0x0C] "INC C",
[0x0D] "DEC C",
[0x0E] "LD C,%.2x",
[0x0F] "RRCA ",
[0x10] "STOP",
[0x11] "LD DE,%.4x",
[0x12] "LD (DE),A",
[0x13] "INC DE",
[0x14] "INC D",
[0x15] "DEC D",
[0x16] "LD D,%.2x",
[0x17] "RLA ",
[0x18] "JR %.2x",
[0x19] "ADD HL,DE",
[0x1A] "LD A,(DE)",
[0x1B] "DEC DE",
[0x1C] "INC E",
[0x1D] "DEC E",
[0x1E] "LD E,%.2x",
[0x1F] "RRA ",
[0x20] "JR NZ,%.2x",
[0x21] "LD HL,%.4x",
[0x22] "LD (HLI),A",
[0x23] "INC HL",
[0x24] "INC H",
[0x25] "DEC H",
[0x26] "LD H,%.2x",
[0x27] "DAA ",
[0x28] "JR Z,%.2x",
[0x29] "ADD HL,HL",
[0x2A] "LD A,(HLI)",
[0x2B] "DEC HL",
[0x2C] "INC L",
[0x2D] "DEC L",
[0x2E] "LD L,%.2x",
[0x2F] "CPL ",
[0x30] "JR NC,%.2x",
[0x31] "LD SP,%.4x",
[0x32] "LD (HLD),A",
[0x33] "INC SP",
[0x34] "INC (HL)",
[0x35] "DEC (HL)",
[0x36] "LD (HL),%.2x",
[0x37] "SCF ",
[0x38] "JR C,%.2x",
[0x39] "ADD HL,SP",
[0x3A] "LD A,(HLD)",
[0x3B] "DEC SP",
[0x3C] "INC A",
[0x3D] "DEC A",
[0x3E] "LD A,%.2x",
[0x3F] "CCF ",
[0x40] "LD B,B",
[0x41] "LD B,C",
[0x42] "LD B,D",
[0x43] "LD B,E",
[0x44] "LD B,H",
[0x45] "LD B,L",
[0x46] "LD B,(HL)",
[0x47] "LD B,A",
[0x48] "LD C,B",
[0x49] "LD C,C",
[0x4A] "LD C,D",
[0x4B] "LD C,E",
[0x4C] "LD C,H",
[0x4D] "LD C,L",
[0x4E] "LD C,(HL)",
[0x4F] "LD C,A",
[0x50] "LD D,B",
[0x51] "LD D,C",
[0x52] "LD D,D",
[0x53] "LD D,E",
[0x54] "LD D,H",
[0x55] "LD D,L",
[0x56] "LD D,(HL)",
[0x57] "LD D,A",
[0x58] "LD E,B",
[0x59] "LD E,C",
[0x5A] "LD E,D",
[0x5B] "LD E,E",
[0x5C] "LD E,H",
[0x5D] "LD E,L",
[0x5E] "LD E,(HL)",
[0x5F] "LD E,A",
[0x60] "LD H,B",
[0x61] "LD H,C",
[0x62] "LD H,D",
[0x63] "LD H,E",
[0x64] "LD H,H",
[0x65] "LD H,L",
[0x66] "LD H,(HL)",
[0x67] "LD H,A",
[0x68] "LD L,B",
[0x69] "LD L,C",
[0x6A] "LD L,D",
[0x6B] "LD L,E",
[0x6C] "LD L,H",
[0x6D] "LD L,L",
[0x6E] "LD L,(HL)",
[0x6F] "LD L,A",
[0x70] "LD (HL),B",
[0x71] "LD (HL),C",
[0x72] "LD (HL),D",
[0x73] "LD (HL),E",
[0x74] "LD (HL),H",
[0x75] "LD (HL),L",
[0x76] "HALT ",
[0x77] "LD (HL),A",
[0x78] "LD A,B",
[0x79] "LD A,C",
[0x7A] "LD A,D",
[0x7B] "LD A,E",
[0x7C] "LD A,H",
[0x7D] "LD A,L",
[0x7E] "LD A,(HL)",
[0x7F] "LD A,A",
[0x80] "ADD A,B",
[0x81] "ADD A,C",
[0x82] "ADD A,D",
[0x83] "ADD A,E",
[0x84] "ADD A,H",
[0x85] "ADD A,L",
[0x86] "ADD A,(HL)",
[0x87] "ADD A,A",
[0x88] "ADC A,B",
[0x89] "ADC A,C",
[0x8A] "ADC A,D",
[0x8B] "ADC A,E",
[0x8C] "ADC A,H",
[0x8D] "ADC A,L",
[0x8E] "ADC A,(HL)",
[0x8F] "ADC A,A",
[0x90] "SUB B",
[0x91] "SUB C",
[0x92] "SUB D",
[0x93] "SUB E",
[0x94] "SUB H",
[0x95] "SUB L",
[0x96] "SUB (HL)",
[0x97] "SUB A",
[0x98] "SBC B",
[0x99] "SBC C",
[0x9A] "SBC D",
[0x9B] "SBC E",
[0x9C] "SBC H",
[0x9D] "SBC L",
[0x9E] "SBC (HL)",
[0x9F] "SBC A",
[0xA0] "AND B",
[0xA1] "AND C",
[0xA2] "AND D",
[0xA3] "AND E",
[0xA4] "AND H",
[0xA5] "AND L",
[0xA6] "AND (HL)",
[0xA7] "AND A",
[0xA8] "XOR B",
[0xA9] "XOR C",
[0xAA] "XOR D",
[0xAB] "XOR E",
[0xAC] "XOR H",
[0xAD] "XOR L",
[0xAE] "XOR (HL)",
[0xAF] "XOR A",
[0xB0] "OR B",
[0xB1] "OR C",
[0xB2] "OR D",
[0xB3] "OR E",
[0xB4] "OR H",
[0xB5] "OR L",
[0xB6] "OR (HL)",
[0xB7] "OR A",
[0xB8] "CP B",
[0xB9] "CP C",
[0xBA] "CP D",
[0xBB] "CP E",
[0xBC] "CP H",
[0xBD] "CP L",
[0xBE] "CP (HL)",
[0xBF] "CP A",
[0xC0] "RET NZ",
[0xC1] "POP BC",
[0xC2] "JP NZ,%.4x",
[0xC3] "JP %.4x",
[0xC4] "CALL NZ,%.4x",
[0xC5] "PUSH BC",
[0xC6] "ADD A,%.2x",
[0xC7] "RST 00H",
[0xC8] "RET Z",
[0xC9] "RET ",
[0xCA] "JP Z,%.4x",
[0xCB] "#CB ",
[0xCC] "CALL Z,%.4x",
[0xCD] "CALL %.4x",
[0xCE] "ADC A,%.2x",
[0xCF] "RST 08H",
[0xD0] "RET NC",
[0xD1] "POP DE",
[0xD2] "JP NC,%.4x",
[0xD3] "---",
[0xD4] "CALL NC,%.4x",
[0xD5] "PUSH DE",
[0xD6] "SUB %.2x",
[0xD7] "RST 10H",
[0xD8] "RET C",
[0xD9] "RETI",
[0xDA] "JP C,%.4x",
[0xDB] "---",
[0xDC] "CALL C,%.4x",
[0xDD] "---",
[0xDE] "SBC A,%.2x",
[0xDF] "RST 18H",
[0xE0] "LD (ff%.2x),A",
[0xE1] "POP HL",
[0xE2] "LD (C),A",
[0xE3] "---",
[0xE4] "---",
[0xE5] "PUSH HL",
[0xE6] "AND %.2x",
[0xE7] "RST 20H",
[0xE8] "ADD SP,%.2x",
[0xE9] "JP (HL)",
[0xEA] "LD (%.4x),A",
[0xEB] "---",
[0xEC] "---",
[0xED] "#ED ",
[0xEE] "XOR %.2x",
[0xEF] "RST 28H",
[0xF0] "LD A,(ff%.2x)",
[0xF1] "POP AF",
[0xF2] "LD A, (C)",
[0xF3] "DI ",
[0xF4] "---",
[0xF5] "PUSH AF",
[0xF6] "OR %.2x",
[0xF7] "RST 30H",
[0xF8] "LDHL SP,%.2x",
[0xF9] "LD SP,HL",
[0xFA] "LD A,(%.4x)",
[0xFB] "EI ",
[0xFC] "---",
[0xFD] "---",
[0xFE] "CP %.2x",
[0xFF] "RST 38H",
};
static int operands[256] = {
[0x00] 0,
[0x01] 2,
[0x02] 0,
[0x03] 0,
[0x04] 0,
[0x05] 0,
[0x06] 1,
[0x07] 0,
[0x08] 0,
[0x09] 0,
[0x0A] 0,
[0x0B] 0,
[0x0C] 0,
[0x0D] 0,
[0x0E] 1,
[0x0F] 0,
[0x10] 0,
[0x11] 2,
[0x12] 0,
[0x13] 0,
[0x14] 0,
[0x15] 0,
[0x16] 1,
[0x17] 0,
[0x18] 1,
[0x19] 0,
[0x1A] 0,
[0x1B] 0,
[0x1C] 0,
[0x1D] 0,
[0x1E] 1,
[0x1F] 0,
[0x20] 1,
[0x21] 2,
[0x22] 0,
[0x23] 0,
[0x24] 0,
[0x25] 0,
[0x26] 1,
[0x27] 0,
[0x28] 1,
[0x29] 0,
[0x2A] 0,
[0x2B] 0,
[0x2C] 0,
[0x2D] 0,
[0x2E] 1,
[0x2F] 0,
[0x30] 1,
[0x31] 2,
[0x32] 0,
[0x33] 0,
[0x34] 0,
[0x35] 0,
[0x36] 1,
[0x37] 0,
[0x38] 1,
[0x39] 0,
[0x3A] 2,
[0x3B] 0,
[0x3C] 0,
[0x3D] 0,
[0x3E] 1,
[0x3F] 0,
[0x40] 0,
[0x41] 0,
[0x42] 0,
[0x43] 0,
[0x44] 0,
[0x45] 0,
[0x46] 0,
[0x47] 0,
[0x48] 0,
[0x49] 0,
[0x4A] 0,
[0x4B] 0,
[0x4C] 0,
[0x4D] 0,
[0x4E] 0,
[0x4F] 0,
[0x50] 0,
[0x51] 0,
[0x52] 0,
[0x53] 0,
[0x54] 0,
[0x55] 0,
[0x56] 0,
[0x57] 0,
[0x58] 0,
[0x59] 0,
[0x5A] 0,
[0x5B] 0,
[0x5C] 0,
[0x5D] 0,
[0x5E] 0,
[0x5F] 0,
[0x60] 0,
[0x61] 0,
[0x62] 0,
[0x63] 0,
[0x64] 0,
[0x65] 0,
[0x66] 0,
[0x67] 0,
[0x68] 0,
[0x69] 0,
[0x6A] 0,
[0x6B] 0,
[0x6C] 0,
[0x6D] 0,
[0x6E] 0,
[0x6F] 0,
[0x70] 0,
[0x71] 0,
[0x72] 0,
[0x73] 0,
[0x74] 0,
[0x75] 0,
[0x76] 0,
[0x77] 0,
[0x78] 0,
[0x79] 0,
[0x7A] 0,
[0x7B] 0,
[0x7C] 0,
[0x7D] 0,
[0x7E] 0,
[0x7F] 0,
[0x80] 0,
[0x81] 0,
[0x82] 0,
[0x83] 0,
[0x84] 0,
[0x85] 0,
[0x86] 0,
[0x87] 0,
[0x88] 0,
[0x89] 0,
[0x8A] 0,
[0x8B] 0,
[0x8C] 0,
[0x8D] 0,
[0x8E] 0,
[0x8F] 0,
[0x90] 0,
[0x91] 0,
[0x92] 0,
[0x93] 0,
[0x94] 0,
[0x95] 0,
[0x96] 0,
[0x97] 0,
[0x98] 0,
[0x99] 0,
[0x9A] 0,
[0x9B] 0,
[0x9C] 0,
[0x9D] 0,
[0x9E] 0,
[0x9F] 0,
[0xA0] 0,
[0xA1] 0,
[0xA2] 0,
[0xA3] 0,
[0xA4] 0,
[0xA5] 0,
[0xA6] 0,
[0xA7] 0,
[0xA8] 0,
[0xA9] 0,
[0xAA] 0,
[0xAB] 0,
[0xAC] 0,
[0xAD] 0,
[0xAE] 0,
[0xAF] 0,
[0xB0] 0,
[0xB1] 0,
[0xB2] 0,
[0xB3] 0,
[0xB4] 0,
[0xB5] 0,
[0xB6] 0,
[0xB7] 0,
[0xB8] 0,
[0xB9] 0,
[0xBA] 0,
[0xBB] 0,
[0xBC] 0,
[0xBD] 0,
[0xBE] 0,
[0xBF] 0,
[0xC0] 0,
[0xC1] 0,
[0xC2] 2,
[0xC3] 2,
[0xC4] 2,
[0xC5] 0,
[0xC6] 1,
[0xC7] 0,
[0xC8] 0,
[0xC9] 0,
[0xCA] 2,
[0xCB] 0,
[0xCC] 2,
[0xCD] 2,
[0xCE] 1,
[0xCF] 0,
[0xD0] 0,
[0xD1] 0,
[0xD2] 2,
[0xD3] 1,
[0xD4] 2,
[0xD5] 0,
[0xD6] 1,
[0xD7] 0,
[0xD8] 0,
[0xD9] 0,
[0xDA] 2,
[0xDB] 1,
[0xDC] 2,
[0xDD] 0,
[0xDE] 1,
[0xDF] 0,
[0xE0] 1,
[0xE1] 0,
[0xE2] 0,
[0xE3] 0,
[0xE4] 2,
[0xE5] 0,
[0xE6] 1,
[0xE7] 0,
[0xE8] 0,
[0xE9] 0,
[0xEA] 2,
[0xEB] 0,
[0xEC] 2,
[0xED] 0,
[0xEE] 1,
[0xEF] 0,
[0xF0] 1,
[0xF1] 0,
[0xF2] 0,
[0xF3] 0,
[0xF4] 2,
[0xF5] 0,
[0xF6] 1,
[0xF7] 0,
[0xF8] 1,
[0xF9] 0,
[0xFA] 2,
[0xFB] 0,
[0xFC] 2,
[0xFD] 0,
[0xFE] 1,
[0xFF] 0,
};
static char *cbopcodes[256] = {
[0x00] "RLC B",
[0x01] "RLC C",
[0x02] "RLC D",
[0x03] "RLC E",
[0x04] "RLC H",
[0x05] "RLC L",
[0x06] "RLC (HL)",
[0x07] "RLC A",
[0x08] "RRC B",
[0x09] "RRC C",
[0x0A] "RRC D",
[0x0B] "RRC E",
[0x0C] "RRC H",
[0x0D] "RRC L",
[0x0E] "RRC (HL)",
[0x0F] "RRC A",
[0x10] "RL B",
[0x11] "RL C",
[0x12] "RL D",
[0x13] "RL E",
[0x14] "RL H",
[0x15] "RL L",
[0x16] "RL (HL)",
[0x17] "RL A",
[0x18] "RR B",
[0x19] "RR C",
[0x1A] "RR D",
[0x1B] "RR E",
[0x1C] "RR H",
[0x1D] "RR L",
[0x1E] "RR (HL)",
[0x1F] "RR A",
[0x20] "SLA B",
[0x21] "SLA C",
[0x22] "SLA D",
[0x23] "SLA E",
[0x24] "SLA H",
[0x25] "SLA L",
[0x26] "SLA (HL)",
[0x27] "SLA A",
[0x28] "SRA B",
[0x29] "SRA C",
[0x2A] "SRA D",
[0x2B] "SRA E",
[0x2C] "SRA H",
[0x2D] "SRA L",
[0x2E] "SRA (HL)",
[0x2F] "SRA A",
[0x30] "SWAP B",
[0x31] "SWAP C",
[0x32] "SWAP D",
[0x33] "SWAP E",
[0x34] "SWAP H",
[0x35] "SWAP L",
[0x36] "SWAP (HL)",
[0x37] "SWAP A",
[0x38] "SRL B",
[0x39] "SRL C",
[0x3A] "SRL D",
[0x3B] "SRL E",
[0x3C] "SRL H",
[0x3D] "SRL L",
[0x3E] "SRL (HL)",
[0x3F] "SRL A",
[0x40] "BIT 0,B",
[0x41] "BIT 0,C",
[0x42] "BIT 0,D",
[0x43] "BIT 0,E",
[0x44] "BIT 0,H",
[0x45] "BIT 0,L",
[0x46] "BIT 0,(HL)",
[0x47] "BIT 0,A",
[0x48] "BIT 1,B",
[0x49] "BIT 1,C",
[0x4A] "BIT 1,D",
[0x4B] "BIT 1,E",
[0x4C] "BIT 1,H",
[0x4D] "BIT 1,L",
[0x4E] "BIT 1,(HL)",
[0x4F] "BIT 1,A",
[0x50] "BIT 2,B",
[0x51] "BIT 2,C",
[0x52] "BIT 2,D",
[0x53] "BIT 2,E",
[0x54] "BIT 2,H",
[0x55] "BIT 2,L",
[0x56] "BIT 2,(HL)",
[0x57] "BIT 2,A",
[0x58] "BIT 3,B",
[0x59] "BIT 3,C",
[0x5A] "BIT 3,D",
[0x5B] "BIT 3,E",
[0x5C] "BIT 3,H",
[0x5D] "BIT 3,L",
[0x5E] "BIT 3,(HL)",
[0x5F] "BIT 3,A",
[0x60] "BIT 4,B",
[0x61] "BIT 4,C",
[0x62] "BIT 4,D",
[0x63] "BIT 4,E",
[0x64] "BIT 4,H",
[0x65] "BIT 4,L",
[0x66] "BIT 4,(HL)",
[0x67] "BIT 4,A",
[0x68] "BIT 5,B",
[0x69] "BIT 5,C",
[0x6A] "BIT 5,D",
[0x6B] "BIT 5,E",
[0x6C] "BIT 5,H",
[0x6D] "BIT 5,L",
[0x6E] "BIT 5,(HL)",
[0x6F] "BIT 5,A",
[0x70] "BIT 6,B",
[0x71] "BIT 6,C",
[0x72] "BIT 6,D",
[0x73] "BIT 6,E",
[0x74] "BIT 6,H",
[0x75] "BIT 6,L",
[0x76] "BIT 6,(HL)",
[0x77] "BIT 6,A",
[0x78] "BIT 7,B",
[0x79] "BIT 7,C",
[0x7A] "BIT 7,D",
[0x7B] "BIT 7,E",
[0x7C] "BIT 7,H",
[0x7D] "BIT 7,L",
[0x7E] "BIT 7,(HL)",
[0x7F] "BIT 7,A",
[0x80] "RES 0,B",
[0x81] "RES 0,C",
[0x82] "RES 0,D",
[0x83] "RES 0,E",
[0x84] "RES 0,H",
[0x85] "RES 0,L",
[0x86] "RES 0,(HL)",
[0x87] "RES 0,A",
[0x88] "RES 1,B",
[0x89] "RES 1,C",
[0x8A] "RES 1,D",
[0x8B] "RES 1,E",
[0x8C] "RES 1,H",
[0x8D] "RES 1,L",
[0x8E] "RES 1,(HL)",
[0x8F] "RES 1,A",
[0x90] "RES 2,B",
[0x91] "RES 2,C",
[0x92] "RES 2,D",
[0x93] "RES 2,E",
[0x94] "RES 2,H",
[0x95] "RES 2,L",
[0x96] "RES 2,(HL)",
[0x97] "RES 2,A",
[0x98] "RES 3,B",
[0x99] "RES 3,C",
[0x9A] "RES 3,D",
[0x9B] "RES 3,E",
[0x9C] "RES 3,H",
[0x9D] "RES 3,L",
[0x9E] "RES 3,(HL)",
[0x9F] "RES 3,A",
[0xA0] "RES 4,B",
[0xA1] "RES 4,C",
[0xA2] "RES 4,D",
[0xA3] "RES 4,E",
[0xA4] "RES 4,H",
[0xA5] "RES 4,L",
[0xA6] "RES 4,(HL)",
[0xA7] "RES 4,A",
[0xA8] "RES 5,B",
[0xA9] "RES 5,C",
[0xAA] "RES 5,D",
[0xAB] "RES 5,E",
[0xAC] "RES 5,H",
[0xAD] "RES 5,L",
[0xAE] "RES 5,(HL)",
[0xAF] "RES 5,A",
[0xB0] "RES 6,B",
[0xB1] "RES 6,C",
[0xB2] "RES 6,D",
[0xB3] "RES 6,E",
[0xB4] "RES 6,H",
[0xB5] "RES 6,L",
[0xB6] "RES 6,(HL)",
[0xB7] "RES 6,A",
[0xB8] "RES 7,B",
[0xB9] "RES 7,C",
[0xBA] "RES 7,D",
[0xBB] "RES 7,E",
[0xBC] "RES 7,H",
[0xBD] "RES 7,L",
[0xBE] "RES 7,(HL)",
[0xBF] "RES 7,A",
[0xC0] "SET 0,B",
[0xC1] "SET 0,C",
[0xC2] "SET 0,D",
[0xC3] "SET 0,E",
[0xC4] "SET 0,H",
[0xC5] "SET 0,L",
[0xC6] "SET 0,(HL)",
[0xC7] "SET 0,A",
[0xC8] "SET 1,B",
[0xC9] "SET 1,C",
[0xCA] "SET 1,D",
[0xCB] "SET 1,E",
[0xCC] "SET 1,H",
[0xCD] "SET 1,L",
[0xCE] "SET 1,(HL)",
[0xCF] "SET 1,A",
[0xD0] "SET 2,B",
[0xD1] "SET 2,C",
[0xD2] "SET 2,D",
[0xD3] "SET 2,E",
[0xD4] "SET 2,H",
[0xD5] "SET 2,L",
[0xD6] "SET 2,(HL)",
[0xD7] "SET 2,A",
[0xD8] "SET 3,B",
[0xD9] "SET 3,C",
[0xDA] "SET 3,D",
[0xDB] "SET 3,E",
[0xDC] "SET 3,H",
[0xDD] "SET 3,L",
[0xDE] "SET 3,(HL)",
[0xDF] "SET 3,A",
[0xE0] "SET 4,B",
[0xE1] "SET 4,C",
[0xE2] "SET 4,D",
[0xE3] "SET 4,E",
[0xE4] "SET 4,H",
[0xE5] "SET 4,L",
[0xE6] "SET 4,(HL)",
[0xE7] "SET 4,A",
[0xE8] "SET 5,B",
[0xE9] "SET 5,C",
[0xEA] "SET 5,D",
[0xEB] "SET 5,E",
[0xEC] "SET 5,H",
[0xED] "SET 5,L",
[0xEE] "SET 5,(HL)",
[0xEF] "SET 5,A",
[0xF0] "SET 6,B",
[0xF1] "SET 6,C",
[0xF2] "SET 6,D",
[0xF3] "SET 6,E",
[0xF4] "SET 6,H",
[0xF5] "SET 6,L",
[0xF6] "SET 6,(HL)",
[0xF7] "SET 6,A",
[0xF8] "SET 7,B",
[0xF9] "SET 7,C",
[0xFA] "SET 7,D",
[0xFB] "SET 7,E",
[0xFC] "SET 7,H",
[0xFD] "SET 7,L",
[0xFE] "SET 7,(HL)",
[0xFF] "SET 7,A",
};
void
disasm(u16int addr)
{
u8int op;
int x;
op = memread(addr);
if(op == 0xCB){
op = memread(addr + 1);
print("%s\n", cbopcodes[op]);
return;
}
switch(operands[op]){
case 0:
print(opcodes[op]);
break;
case 1:
print(opcodes[op], (int)(memread(addr + 1)));
break;
case 2:
x = (uint)memread(addr + 2);
x <<= 8;
x |= (uint)memread(addr + 1);
print(opcodes[op], x);
}
print("\n");
}

6
sys/src/games/gb/fns.h Normal file
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@ -0,0 +1,6 @@
u8int memread(u16int);
void memwrite(u16int, u8int);
int step(void);
void ppustep(void);
void disasm(u16int);
void interrupt(u8int);

201
sys/src/games/gb/gb.c Normal file
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@ -0,0 +1,201 @@
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <keyboard.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
uchar *cart;
int mbc, rombanks, clock, ppuclock, divclock, timerclock, syncclock, timerfreq, timer, keys;
Rectangle picr;
Image *bg;
void
loadrom(char *file)
{
int fd, i;
vlong len;
u8int ck;
char title[17];
Point p;
fd = open(file, OREAD);
if(fd < 0)
sysfatal("open: %r");
len = seek(fd, 0, 2);
if(len < 0)
sysfatal("seek: %r");
if(len == 0 || len > 16*1048576)
sysfatal("are you sure this is a ROM?");
cart = malloc(len);
if(cart == nil)
sysfatal("malloc: %r");
seek(fd, 0, 0);
if(readn(fd, cart, len) < len)
sysfatal("read: %r");
close(fd);
ck = 0;
for(i = 0x134; i <= 0x14C; i++)
ck -= cart[i] + 1;
if(ck != cart[0x14D])
sysfatal("checksum mismatch: %.2x != %.2x", ck, cart[0x14D]);
memcpy(mem, cart, 32768);
memset(title, 0, sizeof(title));
memcpy(title, cart+0x134, 16);
switch(cart[0x147]){
case 0x00:
mbc = 0;
break;
case 0x01:
mbc = 1;
break;
case 0x13:
mbc = 3;
break;
default:
sysfatal("%s: unknown cartridge type %.2x", file, cart[0x147]);
}
switch(cart[0x148]){
case 0: case 1: case 2:
case 3: case 4: case 5:
case 6: case 7:
rombanks = 2 << (uint)cart[0x148];
break;
case 52:
rombanks = 72;
break;
case 53:
rombanks = 80;
break;
case 54:
rombanks = 96;
break;
}
if(len < rombanks * 0x4000)
sysfatal("cartridge image is too small, %.4x < %.4x", (int)len, rombanks * 0x4000);
initdraw(nil, nil, title);
open("/dev/mouse", OREAD);
originwindow(screen, Pt(0, 0), screen->r.min);
p = divpt(addpt(screen->r.min, screen->r.max), 2);
picr = (Rectangle){subpt(p, Pt(80, 72)), addpt(p, Pt(80, 72))};
bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);
draw(screen, screen->r, bg, nil, ZP);
}
void
keyproc(void *)
{
int fd;
char buf[256], *s;
Rune r;
fd = open("/dev/kbd", OREAD);
if(fd < 0)
sysfatal("open: %r");
for(;;){
if(read(fd, buf, 256) <= 0)
sysfatal("read /dev/kbd: %r");
if(buf[0] == 'c' && strchr(buf, 'q'))
threadexitsall(nil);
if(buf[0] != 'k' && buf[0] != 'K')
continue;
s = buf + 1;
keys = 0;
while(*s != 0){
s += chartorune(&r, s);
switch(r){
case 'q':
threadexitsall(nil);
case Kdown:
keys |= 1<<3;
break;
case Kup:
keys |= 1<<2;
break;
case Kleft:
keys |= 1<<1;
break;
case Kright:
keys |= 1<<0;
break;
case 'x':
keys |= 1<<4;
break;
case 'z':
keys |= 1<<5;
break;
case Kshift:
keys |= 1<<6;
break;
case 10:
keys |= 1<<7;
break;
}
}
}
}
void
threadmain(int argc, char** argv)
{
int t, count;
vlong old, new, diff;
ARGBEGIN{
default:
sysfatal("unknown flag -%c", ARGC());
}ARGEND;
if(argc == 0)
sysfatal("argument missing");
pc = 0x100;
sp = 0xFFFE;
R[rA] = 0x01;
R[rC] = 0x13;
R[rE] = 0xD8;
R[rL] = 0x4D;
R[rH] = 0x01;
Fl = 0xB0;
loadrom(argv[0]);
proccreate(keyproc, nil, 8192);
count = 0;
old = nsec();
for(;;){
if(pc == 0x231 && count++)
break;
t = step();
clock += t;
ppuclock += t;
divclock += t;
timerclock += t;
syncclock += t;
if(ppuclock >= 456){
ppustep();
ppuclock -= 456;
}
if(divclock >= 256){
mem[DIV]++;
divclock = 0;
}
if(timer && timerclock >= timerfreq){
mem[TIMA]++;
if(mem[TIMA] == 0){
mem[TIMA] = mem[TMA];
interrupt(INTTIMER);
}
timerclock = 0;
}
if(syncclock >= CPUFREQ / 100){
new = nsec();
diff = new - old;
diff = 10000000 - diff;
diff /= 1000000;
if(diff > 0)
sleep(diff);
old = new;
syncclock = 0;
}
}
}

92
sys/src/games/gb/mem.c Normal file
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@ -0,0 +1,92 @@
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
uchar mem[65536];
int bank;
u8int
memread(u16int p)
{
extern int keys;
if((p & 0xFF80) == 0xFF00)
switch(p){
case 0xFF00:
if((mem[0xFF00] & (1<<5)) == 0)
return (mem[0xFF00] & 0xF0) | ~(keys >> 4);
if((mem[0xFF00] & (1<<6)) == 0)
return (mem[0xFF00] & 0xF0) | ~(keys & 0x0F);
return (mem[0xFF00] & 0xF0) | 0x0F;
}
return mem[p];
}
void
memwrite(u16int p, u8int v)
{
if(p < 0x8000){
switch(mbc){
case 0:
return;
case 1:
switch(p >> 13){
case 1:
if(v == 0)
v++;
bank = v;
if(bank >= rombanks)
sysfatal("invalid ROM bank %d selected (pc = %.4x)", bank, curpc);
memcpy(mem + 0x4000, cart + 0x4000 * bank, 0x4000);
return;
}
return;
case 3:
switch(p >> 13){
case 1:
bank = v;
if(bank >= rombanks)
sysfatal("invalid ROM bank %d selected (pc = %.4x)", bank, curpc);
memcpy(mem + 0x4000, cart + 0x4000 * bank, 0x4000);
return;
}
return;
default:
sysfatal("mbc %d unimplemented", mbc);
}
}
if((p & 0xFF80) == 0xFF00)
switch(p){
case 0xFF04:
v = 0;
break;
case 0xFF07:
timer = (v & 4) != 0;
switch(v & 3){
case 0:
timerfreq = 1024;
break;
case 1:
timerfreq = 16;
break;
case 2:
timerfreq = 64;
break;
default:
timerfreq = 256;
}
break;
case 0xFF41:
v &= ~7;
v |= mem[p] & 7;
break;
case 0xFF46:
memcpy(mem + 0xFE00, mem + (((int)v) << 8), 0xA0);
break;
}
mem[p] = v;
}

15
sys/src/games/gb/mkfile Normal file
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@ -0,0 +1,15 @@
</$objtype/mkfile
BIN=/$objtype/bin/games
TARG=gb
OFILES=\
gb.$O\
cpu.$O\
mem.$O\
disasm.$O\
ppu.$O\
daa.$O\
HFILES=dat.h fns.h
</sys/src/cmd/mkone

196
sys/src/games/gb/ppu.c Normal file
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@ -0,0 +1,196 @@
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
uchar pic[160*144*4];
static void
resolvetile(u8int tx, u8int ty, u8int toy, int window, u8int* tnl1, u8int *tnl2)
{
u16int tni, tnli;
u8int tn;
tni = 0x9800 + 32 * ((u16int)ty) + ((u16int)tx);
if(window){
if(mem[LCDC] & WINDOWTILEMAP)
tni += 0x400;
}else
if(mem[LCDC] & BGTILEMAP)
tni += 0x400;
tn = mem[tni];
if(mem[LCDC] & BGTILEDATA)
tnli = 0x8000 + 16 * (u16int)tn;
else
tnli = 0x9000 + 16 * (u16int)(schar)tn;
*tnl1 = mem[tnli + 2 * ((u16int)toy)];
*tnl2 = mem[tnli + 2 * ((u16int)toy) + 1];
}
static void
pixel(int x, int y, int val, int back)
{
val = (3 - val) * 0x55;
pic[y*160*4 + x*4] = val;
pic[y*160*4 + x*4 + 1] = val;
pic[y*160*4 + x*4 + 2] = val;
pic[y*160*4 + x*4 + 3] = back ? 0 : 0xFF;
}
static void
pixelbelow(int x, int y, int val)
{
if(pic[y*160*4 + x*4 + 3] == 0)
pixel(x, y, val, 0);
}
static void
zeropic(void)
{
int i;
for(i = 0; i < sizeof pic; i++)
pic[i] = ((i & 3) == 3) ? 0 : 0xFF;
}
static void
drawbg(void)
{
u8int Y, x, y, ty, toy, tx, tox, tnl1, tnl2, pal, val,h;
Y = mem[LY];
y = Y + mem[SCY];
ty = y / 8;
toy = y % 8;
tx = mem[SCX] / 8;
tox = mem[SCX] % 8;
resolvetile(tx, ty, toy, 0, &tnl1, &tnl2);
tnl1 <<= (tox+1) % 8;
tnl2 <<= (tox+1) % 8;
pal = mem[BGP];
for(x = 0; x < 160; x++){
tox++;
if((tox % 8) == 0){
tx++;
resolvetile(tx%32, ty, toy, 0, &tnl1, &tnl2);
}
val = ((tnl1 & 0x80) >> 6) | ((tnl2 & 0x80) >> 5);
h = val == 0;
val = (pal >> val) & 3;
pixel(x, Y, val, h);
tnl1 <<= 1;
tnl2 <<= 1;
}
}
static void
drawsprites(void)
{
u8int x, y, tnl1, tnl2, dx, ddx, val, pal;
schar dy;
u16int tnli;
int i;
struct { u8int y, x, t, f; } *s;
y = mem[LY];
s = (void*)(mem + 0xFE00);
for(i = 0; i < 40; i++, s++){
if(s->y == 0 && s->x == 0)
continue;
dy = y - s->y + 16;
if(dy < 0 || dy >= 8)
continue;
pal = (s->f & (1<<4)) ? mem[OBP1] : mem[OBP0];
if(s->f & (1<<6))
dy = 7 - dy;
tnli = 0x8000 + 2 * (u16int)dy + 16 * (u16int) s->t;
tnl1 = mem[tnli];
tnl2 = mem[tnli + 1];
x = s->x - 9;
for(dx = 0; dx < 8; dx++, x++){
ddx = dx;
if((s->f & (1<<5)) == 0)
ddx = 7 - dx;
val = ((tnl1 >> ddx) & 1) | (((tnl2 >> ddx) & 1) << 1);
if(val == 0)
continue;
val = (pal >> (2 * val)) & 3;
if(x >= 160)
break;
if(s->f & (1<<7)){
pixelbelow(x, y, val);
}else
pixel(x, y, val, 0);
}
}
}
static void
drawwindow(void)
{
u8int wx, wy, Y, y, ty, toy, tx, tox, tnl1, tnl2, x, val, pal;
if(mem[WX] < 7)
return;
wx = mem[WX] - 7;
wy = mem[WY];
Y = mem[LY];
if(Y < wy)
return;
y = Y - wy;
ty = y / 8;
toy = y % 8;
tx = 0;
tox = 0;
resolvetile(tx, ty, toy, 1, &tnl1, &tnl2);
pal = mem[BGP];
for(x = wx; x < 160; x++){
tox++;
if((tox & 7) == 0){
tx++;
resolvetile(tx, ty, toy, 1, &tnl1, &tnl2);
}
val = ((tnl1 & 0x80) >> 6) | ((tnl2 & 0x80) >> 5);
val = (pal >> val) & 3;
pixel(x, Y, val, 0);
tnl1 <<= 1;
tnl2 <<= 1;
}
}
void
ppustep(void)
{
extern Rectangle picr;
if(mem[LY] == 144){
mem[STAT] &= ~3;
mem[STAT] |= 1;
interrupt(INTVBLANK);
}
if(mem[LY] == mem[LYC]){
mem[STAT] |= 4;
if(mem[STAT] & 64)
interrupt(INTLCDC);
}else
mem[STAT] &= ~4;
if(mem[LY] < 144 && (mem[LCDC] & LCDOP)){
mem[STAT] &= ~3;
if(mem[LCDC] & BGDISP)
drawbg();
if(mem[LCDC] & WINDOWDISP)
drawwindow();
if(mem[LCDC] & SPRITEDISP)
drawsprites();
}
mem[LY]++;
if(mem[LY] > 160){
mem[LY] = 0;
if(mem[LCDC] & LCDOP){
loadimage(screen, picr, pic, sizeof(pic));
flushimage(display, 1);
zeropic();
}
}
}

View File

@ -22,6 +22,7 @@ BIN=/$objtype/bin/games
DIRS=\
blabs\
doom\
gb\
mahjongg\
mines\
music\