6502/EightBit
1
0
Fork 0
mirror of https://github.com/MoleskiCoder/EightBit.git synced 2024-12-23 15:29:24 +00:00
Code Issues Projects Releases Wiki Activity

Share more of push/pop implementation across processors.

Browse Source 
Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-08-28 13:19:17 +01:00
parent 73a34f4fae
commit 59e9adf57c
4 changed files with 22 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
M6502/inc/mos6502.h
View File

@ -87,10 +87,8 @@ namespace EightBit {
adjustNegative(datum);
}
void pushByte(uint8_t value);
uint8_t popByte();
void pushWord(register16_t value);
void popWord(register16_t& output);
virtual void push(uint8_t value) override;
virtual uint8_t pop() override;
#pragma region 6502 addressing modes

25
M6502/src/mos6502.cpp
View File

@ -80,7 +80,7 @@ void EightBit::MOS6502::getWord(uint16_t offset, register16_t& output) {
void EightBit::MOS6502::interrupt(uint16_t vector) {
pushWord(PC());
pushByte(P());
push(P());
setFlag(P(), IF);
getWord(vector, PC());
}
@ -144,7 +144,7 @@ int EightBit::MOS6502::execute(uint8_t cell) {
RTI();
break;
case 0b010: // PHA
pushByte(A());
push(A());
break;
case 0b011: // JMP
JMP_abs();
@ -165,7 +165,7 @@ int EightBit::MOS6502::execute(uint8_t cell) {
RTS();
break;
case 0b010: // PLA
adjustNZ(A() = popByte());
adjustNZ(A() = pop());
break;
case 0b011: // JMP (abs)
JMP_ind();
@ -347,24 +347,14 @@ int EightBit::MOS6502::execute(uint8_t cell) {
////
void EightBit::MOS6502::pushByte(uint8_t value) {
void EightBit::MOS6502::push(uint8_t value) {
setByte(PageOne + S()--, value);
}
uint8_t EightBit::MOS6502::popByte() {
uint8_t EightBit::MOS6502::pop() {
return getByte(PageOne + ++S());
}
void EightBit::MOS6502::pushWord(register16_t value) {
pushByte(value.high);
pushByte(value.low);
}
void EightBit::MOS6502::popWord(register16_t& output) {
output.low = popByte();
output.high = popByte();
}
////
void EightBit::MOS6502::ROR(uint8_t& output) {
@ -508,12 +498,11 @@ void EightBit::MOS6502::Branch(bool flag) {
void EightBit::MOS6502::PHP() {
setFlag(P(), BF);
pushByte(P());
push(P());
}
void EightBit::MOS6502::PLP() {
P() = popByte();
setFlag(P(), RF);
P() = pop() | RF;
}
//

10
inc/IntelProcessor.h
View File

@ -123,20 +123,10 @@ namespace EightBit {
m_memory.write(--SP().word, value);
}
void pushWord(const register16_t& value) {
push(value.high);
push(value.low);
}
virtual uint8_t pop() {
return m_memory.read(SP().word++);
}
void popWord(register16_t& output) {
output.low = pop();
output.high = pop();
}
void fetchWord() {
Processor::fetchWord(MEMPTR());
}

13
inc/Processor.h
View File

@ -88,6 +88,19 @@ namespace EightBit {
return execute(fetchByte());
}
virtual void push(uint8_t value) = 0;
virtual uint8_t pop() = 0;
void pushWord(const register16_t& value) {
push(value.high);
push(value.low);
}
void popWord(register16_t& output) {
output.low = pop();
output.high = pop();
}
private:
register16_t pc;
bool m_halted;