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add step for debugging

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This commit is contained in:
Stephen Crane 2014-11-19 19:35:16 +00:00
parent 43c7aece2f
commit 93403d5a8e
3 changed files with 202 additions and 193 deletions
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3
cpu.h
View File

@ -7,8 +7,9 @@
class CPU: public Checkpointable {
public:
virtual Memory::address run(unsigned instructions) =0;
virtual void reset () =0;
virtual Memory::address run (unsigned instructions) =0;
virtual Memory::address step() =0;
virtual void raise (int level) =0;
virtual char *status () =0;

15
r6502.cpp
View File

@ -5,9 +5,7 @@
#include "cpu.h"
#include "r6502.h"
Memory::address r6502::run (unsigned clocks) {
while (clocks--)
{
Memory::address r6502::step() {
byte op = (*_memory)[PC];
#ifdef CPU_DEBUG
if (_debug)
@ -15,7 +13,16 @@ Memory::address r6502::run (unsigned clocks) {
#endif
PC++;
(this->*_ops[op])();
}
return PC;
}
Memory::address r6502::run(unsigned clocks) {
#ifdef CPU_DEBUG
if (_debug)
return step();
#endif
while (clocks--)
step();
return PC;
}

1
r6502.h
View File

@ -8,6 +8,7 @@ class r6502: public CPU {
public:
void raise(int);
void reset();
Memory::address step();
Memory::address run(unsigned);
char *status();
void checkpoint(Stream &);