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https://github.com/AppleWin/AppleWin.git
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9553106f4e
Extend LBR so that it includes the control-flow on a taken interrupt Add a new command 'brkint <0|1>' to support Break on Interrupt Internal: in core emulation loop, moved IRQ/NMI check to start of loop so that just the "interrupt vectoring" case can be single-stepped (instead of previously opcode + interrupt vector). Debugger help chm: update Breakpoints section to include BRK, BRKOP and BRKINT
63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
#pragma once
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#include "Common.h"
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struct regsrec
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{
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BYTE a; // accumulator
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BYTE x; // index X
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BYTE y; // index Y
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BYTE ps; // processor status
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WORD pc; // program counter
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WORD sp; // stack pointer
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BYTE bJammed; // CPU has crashed (NMOS 6502 only)
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};
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// 6502 Processor Status flags
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enum {
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AF_SIGN = 0x80,
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AF_OVERFLOW = 0x40,
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AF_RESERVED = 0x20,
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AF_BREAK = 0x10,
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AF_DECIMAL = 0x08,
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AF_INTERRUPT = 0x04,
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AF_ZERO = 0x02,
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AF_CARRY = 0x01
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};
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extern regsrec regs;
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extern unsigned __int64 g_nCumulativeCycles;
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void CpuDestroy ();
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void CpuCalcCycles(ULONG nExecutedCycles);
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DWORD CpuExecute(const DWORD uCycles, const bool bVideoUpdate);
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ULONG CpuGetCyclesThisVideoFrame(ULONG nExecutedCycles);
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void CpuInitialize ();
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void CpuSetupBenchmark ();
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void CpuIrqReset();
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void CpuIrqAssert(eIRQSRC Device);
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void CpuIrqDeassert(eIRQSRC Device);
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void CpuNmiReset();
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void CpuNmiAssert(eIRQSRC Device);
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void CpuNmiDeassert(eIRQSRC Device);
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void CpuReset ();
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void CpuSaveSnapshot(class YamlSaveHelper& yamlSaveHelper);
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void CpuLoadSnapshot(class YamlLoadHelper& yamlLoadHelper, UINT version);
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BYTE CpuRead(USHORT addr, ULONG uExecutedCycles);
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void CpuWrite(USHORT addr, BYTE value, ULONG uExecutedCycles);
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enum eCpuType {CPU_UNKNOWN=0, CPU_6502=1, CPU_65C02, CPU_Z80}; // Don't change! Persisted to Registry
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eCpuType GetMainCpu(void);
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void SetMainCpu(eCpuType cpu);
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eCpuType ProbeMainCpuDefault(eApple2Type apple2Type);
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void SetMainCpuDefault(eApple2Type apple2Type);
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eCpuType GetActiveCpu(void);
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void SetActiveCpu(eCpuType cpu);
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bool IsIrqAsserted(void);
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bool Is6502InterruptEnabled(void);
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void ResetCyclesExecutedForDebugger(void);
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bool IsInterruptInLastExecution(void);
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