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Emulator: Prepare for running blargg's test ROMs

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Riyyi
2022-09-01 14:20:57 +02:00
parent 38b740856e
commit ed045a72b2
2 changed files with 16 additions and 4 deletions
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src/cpu-prefix.cpp
+1 -1
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@@ -19,7 +19,7 @@ void CPU::prefix()
// Read next opcode
uint8_t opcode = read(m_pc);
print("running opcode: {:#04x} @ ({:#06x})\n", opcode, m_pc);
// print("running opcode: {:#04x} @ ({:#06x})\n", opcode, m_pc);
if (opcode <= 0x07) {
rlc();
}
src/cpu.cpp
+15 -3
View File
@@ -58,15 +58,20 @@ CPU::~CPU()
void CPU::update()
{
m_wait_cycles--;
// TODO: convert to early-return
if (m_wait_cycles <= 0) {
// print(ruc::format::Emphasis::Underline | ruc::format::Emphasis::Bold | fg(ruc::format::TerminalColor::Blue), "{:#06x}\n", *this);
// Read next opcode
uint8_t opcode = read(m_pc);
print("running opcode: {:#04x} @ ({:#06x})\n", opcode, m_pc);
// print("running opcode: {:#04x} @ ({:#06x})\n", opcode, m_pc);
switch (opcode) {
case 0x10: /* TODO */ m_pc += 2; break;
case 0xf3: /* TODO */ m_pc += 1; break;
case 0xfb: /* TODO */ m_pc += 1; break;
case 0x00: nop(); break;
case 0x01: ldi16(); break;
case 0x02: ldr8(); break;
@@ -281,6 +286,7 @@ void CPU::update()
case 0xd6: sub8(); break;
case 0xd7: rst(); break;
case 0xd8: ret(); break;
case 0xd9: ret(); break;
case 0xda: jp16(); break;
case 0xdc: call(); break;
case 0xde: sbc8(); break;
@@ -1525,7 +1531,12 @@ void CPU::ret()
case 0xc9: /* RET i16 */ function_return(true); break;
case 0xd0: /* RET NC,i16 */ function_return(!m_cf); break;
case 0xd8: /* RET C,i16 */ function_return(m_cf); break;
// case 0xd9: /* RETI */ FIXME break;
case 0xd9: /* RETI */ {
// Return from subroutine
// TODO: and enable interrupts.
function_return(true);
break;
}
default:
VERIFY_NOT_REACHED();
}
@@ -1641,7 +1652,8 @@ void CPU::write(uint32_t address, uint32_t value)
uint32_t CPU::read(uint32_t address)
{
return Emu::the().readMemory(address) & 0xff;
// FIXME: Figure out where HL gets set to above 0xffff
return Emu::the().readMemory(address & 0xffff) & 0xff;
}
void CPU::ffWrite(uint32_t address, uint32_t value)