Seth Morabito
7268766cd6
This change adds a new "Step Over" button, which is enabled
when a "JSR" (Jump to Subroutine) instruction is encountered
while stepping through execution one instruction at a time.
Pressing "Step Over" will continue running instructions until a
corresponding "RTS" (Return from Subroutine) is encountered.
While stepping over a subroutine, the call stack depth is tracked
in an attempt to halt only when the *correct* RTS is encountered.
In other words, it should skip over other subroutines nested
inside the call you want to step over:
```
JSR A # Step over here...
...
JSR B
...
RTS # Returns from 'B', doesn't halt
...
RTS # Returns from 'A', halts after return
```
Implements feature request #18.
50 lines
1.8 KiB
Java
50 lines
1.8 KiB
Java
/*
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* Copyright (c) 2008-2025 Seth J. Morabito <web@loomcom.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package com.loomcom.symon.devices;
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import com.loomcom.symon.exceptions.MemoryAccessException;
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import com.loomcom.symon.exceptions.MemoryRangeException;
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/**
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* Skeleton for future implementation of a MOS 6522 VIA.
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*/
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public class Via6522 extends Pia {
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public static final int VIA_SIZE = 16;
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public Via6522(int address) throws MemoryRangeException {
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super(address, address + VIA_SIZE - 1, "MOS 6522 VIA");
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}
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@Override
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public void write(int address, int data) throws MemoryAccessException {
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// TODO: Implement write.
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}
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@Override
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public int read(int address, boolean cpuAccess) throws MemoryAccessException {
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// TODO: Implement read.
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return 0;
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}
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}
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