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dfd5bcab1b
Early data sheets listed BRK as one byte, but RTI after a BRK skips the following byte, effectively making BRK a 2-byte instruction. Sometimes, such as when diassembling Apple /// SOS code, it's handy to treat it that way explicitly. This change makes two-byte BRKs optional, controlled by a checkbox in the project settings. In the system definitions it defaults to true for Apple ///, false for all others. ACME doesn't allow BRK to have an arg, and cc65 only allows it for 65816 code (?), so it's emitted as a hex blob for those assemblers. Anyone wishing to target those assemblers should stick to 1-byte mode. Extension scripts have to switch between formatting one byte of inline data and formatting an instruction with a one-byte operand. A helper function has been added to the plugin Util class. To get some regression test coverage, 2022-extension-scripts has been configured to use two-byte BRK. Also, added/corrected some SOS constants. See also issue #44.
89 lines
2.9 KiB
C#
89 lines
2.9 KiB
C#
/*
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* Copyright 2019 faddenSoft
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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using PluginCommon;
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/*
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BRK
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DFB command_code
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DW parm_block
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parm_block
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dfb parm_count
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parameters...
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*/
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namespace RuntimeData.Apple {
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public class SOS : MarshalByRefObject, IPlugin, IPlugin_InlineBrk {
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private const string SOS_MLI_TAG = "SOS-MLI-Functions"; // tag used in .sym65 file
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private bool VERBOSE = true;
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private IApplication mAppRef;
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private byte[] mFileData;
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private Dictionary<int, PlSymbol> mFunctionList;
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public string Identifier {
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get {
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return "Apple III SOS MLI call handler";
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}
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}
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public void Prepare(IApplication appRef, byte[] fileData, AddressTranslate addrTrans,
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List<PlSymbol> plSyms) {
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mAppRef = appRef;
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mFileData = fileData;
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mAppRef.DebugLog("SOS(id=" + AppDomain.CurrentDomain.Id + "): prepare()");
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//System.Diagnostics.Debugger.Break();
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mFunctionList = PlSymbol.GeneratePlatformValueList(plSyms, SOS_MLI_TAG, appRef);
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}
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public void CheckBrk(int offset, bool twoByteBrk, out bool noContinue) {
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noContinue = true;
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if (offset + 4 >= mFileData.Length) {
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// ran off the end
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return;
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}
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// We don't want every BRK to get formatted, so we only format it if we find
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// a matching symbol for the command code.
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byte req = mFileData[offset + 1];
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if (VERBOSE) {
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int addr = Util.GetWord(mFileData, offset + 2, 2, false);
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mAppRef.DebugLog("Potential SOS call detected at +" + offset.ToString("x6") +
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", cmd=$" + req.ToString("x2") + " addr=$" + addr.ToString("x4"));
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}
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PlSymbol sym;
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if (!mFunctionList.TryGetValue(req, out sym)) {
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return;
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}
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Util.FormatBrkByte(mAppRef, twoByteBrk, offset, DataSubType.Symbol, sym.Label);
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mAppRef.SetInlineDataFormat(offset + 2, 2, DataType.NumericLE,
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DataSubType.Address, null);
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// Clear the "no continue" flag unless this is a QUIT call.
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if (req != 0x65) { // QUIT call
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noContinue = false;
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}
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}
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}
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}
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