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Include interrupt information in the disassembler output.

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Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2020-11-12 16:22:44 +00:00
parent f7da03d46b
commit b8a2db96f4
4 changed files with 38 additions and 5 deletions
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1
LR35902/inc/Disassembler.h
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@ -27,6 +27,7 @@ namespace EightBit {
static std::string binary(uint8_t value);
static std::string decimal(uint8_t value);
static std::string io(uint8_t value);
static std::string interrupt(uint8_t value);
static std::string invalid(uint8_t value);

6
LR35902/inc/LR35902.h
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@ -35,6 +35,10 @@ namespace EightBit {
[[nodiscard]] register16_t& DE() final;
[[nodiscard]] register16_t& HL() final;
bool& IME() noexcept { return m_ime; }
[[nodiscard]] uint8_t enabledInterrupts();
[[nodiscard]] uint8_t flaggedInterrupts();
[[nodiscard]] uint8_t maskedInterrupts();
protected:
@ -89,8 +93,6 @@ namespace EightBit {
bool m_prefixCB = false;
bool& IME() noexcept { return m_ime; }
[[nodiscard]] auto R(const int r) {
ASSUME(r >= 0);
ASSUME(r <= 7);

24
LR35902/src/Disassembler.cpp
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@ -31,6 +31,9 @@ std::string EightBit::GameBoy::Disassembler::state(LR35902& cpu) {
auto h = cpu.H();
auto l = cpu.L();
const auto maskedInterrupts = cpu.maskedInterrupts();
const auto ime = cpu.IME();
std::ostringstream output;
output
@ -42,6 +45,12 @@ std::string EightBit::GameBoy::Disassembler::state(LR35902& cpu) {
<< " " << "D=" << hex(d) << " " << "E=" << hex(e)
<< " " << "H=" << hex(h) << " " << "L=" << hex(l);
// Interrupt handling
output << " IME:" << (ime ? "I" : "-");
output << " IE:" << interrupt(cpu.enabledInterrupts());
output << " IF:" << interrupt(cpu.flaggedInterrupts());
output << " (" << interrupt(cpu.maskedInterrupts()) << ")";
return output.str();
}
@ -683,3 +692,18 @@ std::string EightBit::GameBoy::Disassembler::io(uint8_t value) {
return hex(value);
}
}
std::string EightBit::GameBoy::Disassembler::interrupt(uint8_t value) {
std::ostringstream output;
const auto ik = value & IoRegisters::KeypadPressed;
output << (ik ? "K" : "-");
const auto is = value & IoRegisters::SerialTransfer;
output << (is ? "S" : "-");
const auto it = value & IoRegisters::TimerOverflow;
output << (it ? "T" : "-");
const auto id = value & IoRegisters::DisplayControlStatus;
output << (id ? "D" : "-");
const auto iv = value & IoRegisters::VerticalBlank;
output << (iv ? "V" : "-");
return output.str();
}

12
LR35902/src/LR35902.cpp
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@ -295,10 +295,16 @@ void EightBit::GameBoy::LR35902::ccf(uint8_t& f, const uint8_t operand) {
f = clearBit(f, CF, f & CF);
}
uint8_t EightBit::GameBoy::LR35902::enabledInterrupts() {
return BUS().peek(IoRegisters::BASE + IoRegisters::IE);
}
uint8_t EightBit::GameBoy::LR35902::flaggedInterrupts() {
return m_bus.IO().peek(IoRegisters::IF);
}
uint8_t EightBit::GameBoy::LR35902::maskedInterrupts() {
const auto interruptEnable = BUS().peek(IoRegisters::BASE + IoRegisters::IE);
const auto interruptFlags = m_bus.IO().peek(IoRegisters::IF);
return interruptEnable & interruptFlags;
return enabledInterrupts() & flaggedInterrupts();
}
int EightBit::GameBoy::LR35902::step() {