mirror of
https://github.com/fadden/6502bench.git
synced 2024-05-31 22:41:37 +00:00
6e9ff395d2
It's useful for extension scripts to be able to get the file offset of symbols in non-addressable regions. One example of this is CHR ROM data for an NES cartridge. However, we were getting the offset by doing an address-to-offset mapping on the plugin side, which by definition doesn't work for non-addressable memory. So we now add the offset to PlSymbol objects for user labels and address region pre-labels. The NES visualizer has been updated to use the new field. Also, fixed a bogus complaint about bank overruns for non-addressable regions.
615 lines
30 KiB
C#
615 lines
30 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 System.ComponentModel;
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using System.Diagnostics;
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using System.IO;
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using Asm65;
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using CommonUtil;
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namespace SourceGen.AsmGen {
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public class GenCommon {
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/// <summary>
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/// Generates assembly source.
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///
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/// This code is common to all generators.
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/// </summary>
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/// <param name="gen">Reference to generator object (presumably the caller).</param>
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/// <param name="sw">Text output sink.</param>
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/// <param name="worker">Background worker object, for progress updates and
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/// cancelation requests.</param>
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public static void Generate(IGenerator gen, StreamWriter sw, BackgroundWorker worker) {
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DisasmProject proj = gen.Project;
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Formatter formatter = gen.SourceFormatter;
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int offset = gen.StartOffset;
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bool doAddCycles = gen.Settings.GetBool(AppSettings.SRCGEN_SHOW_CYCLE_COUNTS, false);
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LocalVariableLookup lvLookup = new LocalVariableLookup(proj.LvTables, proj,
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gen.Localizer.LabelMap, gen.Quirks.LeadingUnderscoreSpecial,
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gen.Quirks.NoRedefinableSymbols);
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GenerateHeader(gen, sw);
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// Used for M/X flag tracking.
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StatusFlags prevFlags = StatusFlags.AllIndeterminate;
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int lastProgress = 0;
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// Create an address map iterator and advance it to match gen.StartOffset.
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IEnumerator<AddressMap.AddressChange> addrIter = proj.AddrMap.AddressChangeIterator;
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while (addrIter.MoveNext()) {
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if (addrIter.Current.IsStart && addrIter.Current.Offset >= offset) {
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break;
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}
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}
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bool arDirectPending = false;
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while (offset < proj.FileData.Length) {
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Anattrib attr = proj.GetAnattrib(offset);
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if (attr.IsInstructionStart && offset > 0 &&
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proj.GetAnattrib(offset - 1).IsData) {
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// Transition from data to code. (Don't add blank line for inline data.)
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gen.OutputLine(string.Empty);
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}
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// Long comments come first.
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if (proj.LongComments.TryGetValue(offset, out MultiLineComment longComment)) {
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List<string> formatted = longComment.FormatText(formatter, string.Empty);
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foreach (string str in formatted) {
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gen.OutputLine(str);
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}
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}
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// Check for address range starts. There may be more than one at a given offset.
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AddressMap.AddressChange change = addrIter.Current;
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while (change != null && change.Offset == offset) {
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if (change.IsStart) {
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gen.OutputArDirective(change);
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arDirectPending = true;
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addrIter.MoveNext();
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change = addrIter.Current;
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} else {
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break;
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}
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}
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// Reached end of start directives. Write the last one.
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if (arDirectPending) {
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gen.FlushArDirectives();
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arDirectPending = false;
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}
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List<DefSymbol> lvars = lvLookup.GetVariablesDefinedAtOffset(offset);
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if (lvars != null) {
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// table defined here
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gen.OutputLocalVariableTable(offset, lvars,
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lvLookup.GetMergedTableAtOffset(offset));
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}
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if (attr.IsInstructionStart) {
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// Generate M/X reg width directive, if necessary.
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// NOTE: we can suppress the initial directive if we know what the
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// target assembler's default assumption is. Probably want to handle
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// that in the ORG output handler.
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if (proj.CpuDef.HasEmuFlag) {
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StatusFlags curFlags = attr.StatusFlags;
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curFlags.M = attr.StatusFlags.IsShortM ? 1 : 0;
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curFlags.X = attr.StatusFlags.IsShortX ? 1 : 0;
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if (curFlags.M != prevFlags.M || curFlags.X != prevFlags.X) {
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// changed, output directive
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gen.OutputRegWidthDirective(offset, prevFlags.M, prevFlags.X,
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curFlags.M, curFlags.X);
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}
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prevFlags = curFlags;
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}
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// Look for embedded instructions.
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int len;
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for (len = 1; len < attr.Length; len++) {
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if (proj.GetAnattrib(offset + len).IsInstructionStart) {
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break;
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}
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}
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// Output instruction.
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GenerateInstruction(gen, sw, lvLookup, offset, len, doAddCycles);
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if (attr.DoesNotContinue) {
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gen.OutputLine(string.Empty);
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}
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offset += len;
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} else {
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gen.OutputDataOp(offset);
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offset += attr.Length;
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}
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// Check for address region ends. There may be more than one at a given offset.
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// The end-region offset will be the last byte of the instruction or data item,
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// so it should be one less than the updated offset.
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//
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// If we encounter a region start, we'll handle that at the top of the next
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// loop iteration.
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while (change != null && change.Offset + 1 == offset) {
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if (!change.IsStart) {
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gen.OutputArDirective(change);
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arDirectPending = true;
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addrIter.MoveNext();
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change = addrIter.Current;
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} else {
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break;
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}
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}
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// Update progress meter. We don't want to spam it, so just ping it 10x.
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int curProgress = (offset * 10) / proj.FileData.Length;
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if (lastProgress != curProgress) {
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if (worker.CancellationPending) {
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Debug.WriteLine("GenCommon got cancellation request");
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return;
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}
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lastProgress = curProgress;
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worker.ReportProgress(curProgress * 10);
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//System.Threading.Thread.Sleep(500);
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}
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}
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Debug.Assert(offset == proj.FileDataLength);
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}
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private static void GenerateHeader(IGenerator gen, StreamWriter sw) {
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DisasmProject proj = gen.Project;
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Formatter formatter = gen.SourceFormatter;
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// Check for header comment.
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if (proj.LongComments.TryGetValue(LineListGen.Line.HEADER_COMMENT_OFFSET,
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out MultiLineComment headerComment)) {
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List<string> formatted = headerComment.FormatText(formatter, string.Empty);
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foreach (string str in formatted) {
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gen.OutputLine(str);
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}
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}
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gen.OutputAsmConfig();
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// Format symbols.
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bool prevConst = false;
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foreach (DefSymbol defSym in proj.ActiveDefSymbolList) {
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if (prevConst && !defSym.IsConstant) {
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// Output a blank line between the constants and the address equates.
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gen.OutputLine(string.Empty);
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}
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// Use an operand length of 1 so values are shown as concisely as possible.
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string valueStr = PseudoOp.FormatNumericOperand(formatter, proj.SymbolTable,
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gen.Localizer.LabelMap, defSym.DataDescriptor, defSym.Value, 1,
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PseudoOp.FormatNumericOpFlags.OmitLabelPrefixSuffix);
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string labelStr = gen.Localizer.ConvLabel(defSym.Label);
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gen.OutputEquDirective(labelStr, valueStr, defSym.Comment);
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prevConst = defSym.IsConstant;
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}
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// If there was at least one symbol, output a blank line.
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if (proj.ActiveDefSymbolList.Count != 0) {
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gen.OutputLine(string.Empty);
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}
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}
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private static void GenerateInstruction(IGenerator gen, StreamWriter sw,
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LocalVariableLookup lvLookup, int offset, int instrBytes, bool doAddCycles) {
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DisasmProject proj = gen.Project;
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Formatter formatter = gen.SourceFormatter;
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byte[] data = proj.FileData;
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Anattrib attr = proj.GetAnattrib(offset);
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string labelStr = string.Empty;
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if (attr.Symbol != null) {
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labelStr = gen.Localizer.ConvLabel(attr.Symbol.Label);
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}
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OpDef op = proj.CpuDef.GetOpDef(data[offset]);
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int operand = op.GetOperand(data, offset, attr.StatusFlags);
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int instrLen = op.GetLength(attr.StatusFlags);
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OpDef.WidthDisambiguation wdis = OpDef.WidthDisambiguation.None;
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if (op.IsWidthPotentiallyAmbiguous) {
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wdis = OpDef.GetWidthDisambiguation(instrLen, operand);
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}
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if (gen.Quirks.SinglePassAssembler && wdis == OpDef.WidthDisambiguation.None &&
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(op.AddrMode == OpDef.AddressMode.DP ||
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op.AddrMode == OpDef.AddressMode.DPIndexX) ||
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op.AddrMode == OpDef.AddressMode.DPIndexY) {
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// Could be a forward reference to a direct-page label. For ACME, we don't
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// care if it's forward or not.
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if ((gen.Quirks.SinglePassNoLabelCorrection && IsLabelReference(gen, offset)) ||
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IsForwardLabelReference(gen, offset)) {
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wdis = OpDef.WidthDisambiguation.ForceDirect;
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}
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}
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if (wdis == OpDef.WidthDisambiguation.ForceLongMaybe &&
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gen.Quirks.SinglePassAssembler &&
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IsForwardLabelReference(gen, offset)) {
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// Assemblers like cc65 can't tell if a symbol reference is Absolute or
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// Long if they haven't seen the symbol yet. Irrelevant for ACME, which
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// doesn't currently handle 65816 outside bank 0.
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wdis = OpDef.WidthDisambiguation.ForceLong;
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}
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string opcodeStr = formatter.FormatOpcode(op, wdis);
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string formattedOperand = null;
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int operandLen = instrLen - 1;
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PseudoOp.FormatNumericOpFlags opFlags =
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PseudoOp.FormatNumericOpFlags.OmitLabelPrefixSuffix;
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bool isPcRelBankWrap = false;
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// Tweak branch instructions. We want to show the absolute address rather
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// than the relative offset (which happens with the OperandAddress assignment
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// below), and 1-byte branches should always appear as a 4-byte hex value.
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// Unless we're outside bank 0 on 65816, in which case most assemblers require
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// them to be 6-byte hex values.
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if (op.AddrMode == OpDef.AddressMode.PCRel ||
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op.AddrMode == OpDef.AddressMode.DPPCRel) {
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Debug.Assert(attr.OperandAddress >= 0);
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operandLen = 2;
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opFlags |= PseudoOp.FormatNumericOpFlags.IsPcRel;
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} else if (op.AddrMode == OpDef.AddressMode.PCRelLong ||
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op.AddrMode == OpDef.AddressMode.StackPCRelLong) {
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opFlags |= PseudoOp.FormatNumericOpFlags.IsPcRel;
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} else if (op.AddrMode == OpDef.AddressMode.Imm ||
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op.AddrMode == OpDef.AddressMode.ImmLongA ||
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op.AddrMode == OpDef.AddressMode.ImmLongXY) {
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opFlags |= PseudoOp.FormatNumericOpFlags.HasHashPrefix;
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}
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if ((opFlags & PseudoOp.FormatNumericOpFlags.IsPcRel) != 0) {
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int branchDist = attr.Address - attr.OperandAddress;
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isPcRelBankWrap = branchDist > 32767 || branchDist < -32768;
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}
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if (op.IsAbsolutePBR) {
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opFlags |= PseudoOp.FormatNumericOpFlags.IsAbsolutePBR;
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}
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if (gen.Quirks.BankZeroAbsPBRRestrict) {
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// Hack to avoid having to define a new FormatConfig.ExpressionMode for 64tass.
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// Get rid of this 64tass gets its own exp mode.
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opFlags |= PseudoOp.FormatNumericOpFlags.Is64Tass;
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}
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// 16-bit operands outside bank 0 need to include the bank when computing
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// symbol adjustment.
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int operandForSymbol = operand;
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if (attr.OperandAddress >= 0) {
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operandForSymbol = attr.OperandAddress;
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}
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// Check Length to watch for bogus descriptors. (ApplyFormatDescriptors() should
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// now be screening bad descriptors out, so we may not need the Length test.)
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if (attr.DataDescriptor != null && attr.Length == attr.DataDescriptor.Length) {
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FormatDescriptor dfd = gen.ModifyInstructionOperandFormat(offset,
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attr.DataDescriptor, operand);
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// Format operand as directed.
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if (op.AddrMode == OpDef.AddressMode.BlockMove) {
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// Special handling for the double-operand block move.
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string opstr1 = PseudoOp.FormatNumericOperand(formatter, proj.SymbolTable,
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gen.Localizer.LabelMap, dfd, operand >> 8, 1,
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PseudoOp.FormatNumericOpFlags.OmitLabelPrefixSuffix);
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string opstr2 = PseudoOp.FormatNumericOperand(formatter, proj.SymbolTable,
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gen.Localizer.LabelMap, dfd, operand & 0xff, 1,
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PseudoOp.FormatNumericOpFlags.OmitLabelPrefixSuffix);
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if (gen.Quirks.BlockMoveArgsReversed) {
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string tmp = opstr1;
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opstr1 = opstr2;
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opstr2 = tmp;
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}
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string hash = gen.Quirks.BlockMoveArgsNoHash ? "" : "#";
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formattedOperand = hash + opstr1 + "," + hash + opstr2;
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} else if (op.AddrMode == OpDef.AddressMode.DPPCRel) {
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// Special handling for double-operand BBR/BBS. The instruction generally
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// behaves like a branch, so format that first.
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string branchStr = PseudoOp.FormatNumericOperand(formatter,
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proj.SymbolTable, gen.Localizer.LabelMap, dfd,
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operandForSymbol, operandLen, opFlags);
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string dpStr = formatter.FormatHexValue(operand & 0xff, 2);
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formattedOperand = dpStr + "," + branchStr;
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} else {
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if (attr.DataDescriptor.IsStringOrCharacter) {
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gen.UpdateCharacterEncoding(dfd);
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}
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formattedOperand = PseudoOp.FormatNumericOperand(formatter, proj.SymbolTable,
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lvLookup, gen.Localizer.LabelMap, dfd,
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offset, operandForSymbol, operandLen, opFlags);
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}
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} else {
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// Show operand value in hex.
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if (op.AddrMode == OpDef.AddressMode.BlockMove) {
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int arg1, arg2;
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if (gen.Quirks.BlockMoveArgsReversed) {
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arg1 = operand & 0xff;
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arg2 = operand >> 8;
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} else {
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arg1 = operand >> 8;
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arg2 = operand & 0xff;
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}
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string hash = gen.Quirks.BlockMoveArgsNoHash ? "" : "#";
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formattedOperand = hash + formatter.FormatHexValue(arg1, 2) + "," +
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hash + formatter.FormatHexValue(arg2, 2);
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} else if (op.AddrMode == OpDef.AddressMode.DPPCRel) {
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formattedOperand = formatter.FormatHexValue(operand & 0xff, 2) + "," +
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formatter.FormatHexValue(operandForSymbol, operandLen * 2);
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} else {
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if (operandLen == 2 && !(op.IsAbsolutePBR && gen.Quirks.Need24BitsForAbsPBR) &&
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(opFlags & PseudoOp.FormatNumericOpFlags.IsPcRel) == 0) {
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// This is necessary for 16-bit operands, like "LDA abs" and "PEA val",
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// when outside bank zero. The bank is included in the operand address,
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// but we don't want to show it here. We may need it for JSR/JMP though,
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// and the bank is required for relative branch instructions.
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operandForSymbol &= 0xffff;
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}
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formattedOperand = formatter.FormatHexValue(operandForSymbol, operandLen * 2);
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}
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}
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string operandStr = formatter.FormatOperand(op, formattedOperand, wdis);
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if (gen.Quirks.StackIntOperandIsImmediate &&
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op.AddrMode == OpDef.AddressMode.StackInt) {
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// COP $02 is standard, but some require COP #$02
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operandStr = '#' + operandStr;
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}
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// The BBR/BBS/RMB/SMB instructions include a bit index (0-7). The standard way is
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// to make it part of the mnemonic, but some assemblers make it an argument.
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if (gen.Quirks.BitNumberIsArg && op.IsNumberedBitOp) {
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// Easy way: do some string manipulation.
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char bitIndex = opcodeStr[opcodeStr.Length - 1];
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opcodeStr = opcodeStr.Substring(0, opcodeStr.Length - 1);
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operandStr = bitIndex.ToString() + "," + operandStr;
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}
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string eolComment = proj.Comments[offset];
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if (doAddCycles) {
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bool branchCross = (attr.Address & 0xff00) != (operandForSymbol & 0xff00);
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int cycles = proj.CpuDef.GetCycles(op.Opcode, attr.StatusFlags, attr.BranchTaken,
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branchCross);
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if (cycles > 0) {
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if (!string.IsNullOrEmpty(eolComment)) {
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eolComment = cycles.ToString() + " " + eolComment;
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} else {
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eolComment = cycles.ToString();
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}
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} else {
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if (!string.IsNullOrEmpty(eolComment)) {
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eolComment = (-cycles).ToString() + "+ " + eolComment;
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} else {
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eolComment = (-cycles).ToString() + "+";
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}
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}
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}
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string commentStr = formatter.FormatEolComment(eolComment);
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string replMnemonic = gen.ModifyOpcode(offset, op);
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if (attr.Length != instrBytes) {
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// This instruction has another instruction inside it. Throw out what we
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// computed and just output as bytes.
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// TODO: in some odd situations we can split something that doesn't need
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// to be split (see note at end of #107). Working around the problem at
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// this stage is a little awkward because I think we need to check for the
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// presence of labels on one or more later lines.
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gen.GenerateShortSequence(offset, instrBytes, out opcodeStr, out operandStr);
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} else if (isPcRelBankWrap && gen.Quirks.NoPcRelBankWrap) {
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// Some assemblers have trouble generating PC-relative operands that wrap
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// around the bank. Output as raw hex.
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gen.GenerateShortSequence(offset, instrBytes, out opcodeStr, out operandStr);
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} else if (op.AddrMode == OpDef.AddressMode.BlockMove &&
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gen.Quirks.BlockMoveArgsReversed) {
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// On second thought, just don't even output the wrong thing.
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gen.GenerateShortSequence(offset, instrBytes, out opcodeStr, out operandStr);
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} else if (replMnemonic == null) {
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// No mnemonic exists for this opcode.
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gen.GenerateShortSequence(offset, instrBytes, out opcodeStr, out operandStr);
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} else if (replMnemonic != string.Empty) {
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// A replacement mnemonic has been provided.
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opcodeStr = formatter.FormatMnemonic(replMnemonic, wdis);
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}
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gen.OutputLine(labelStr, opcodeStr, operandStr, commentStr);
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// Assemblers like Merlin32 try to be helpful and track SEP/REP, but they do the
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// wrong thing if we're in emulation mode. Force flags back to short.
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if (proj.CpuDef.HasEmuFlag && gen.Quirks.TracksSepRepNotEmu && op == OpDef.OpREP_Imm) {
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if ((operand & 0x30) != 0 && attr.StatusFlags.IsEmulationMode) {
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gen.OutputRegWidthDirective(offset, 0, 0, 1, 1);
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}
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}
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}
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/// <summary>
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/// Determines whether the instruction at the specified offset has an operand that is
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/// a forward reference. This only matters for single-pass assemblers.
|
|
/// </summary>
|
|
/// <param name="gen">Source generator reference.</param>
|
|
/// <param name="offset">Offset of instruction opcode.</param>
|
|
/// <returns>True if the instruction's operand is a forward reference to a label.</returns>
|
|
private static bool IsForwardLabelReference(IGenerator gen, int offset) {
|
|
return (GetLabelOffsetFromOperand(gen, offset) > offset);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the instruction at the specified offset has an operand
|
|
/// that references a symbol.
|
|
/// </summary>
|
|
/// <param name="gen">Source generator reference.</param>
|
|
/// <param name="offset">Offset of instruction opcode.</param>
|
|
/// <returns>True if the instruction's operand is a forward reference to a label.</returns>
|
|
private static bool IsLabelReference(IGenerator gen, int offset) {
|
|
return (GetLabelOffsetFromOperand(gen, offset) >= 0);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines the offset of the label that the operand's symbol references.
|
|
/// </summary>
|
|
/// <param name="gen">Source generator reference.</param>
|
|
/// <param name="offset">Offset of instruction opcode.</param>
|
|
/// <returns>The offset of the label, or -1 if the operand isn't a symbolic reference
|
|
/// to a known label.</returns>
|
|
private static int GetLabelOffsetFromOperand(IGenerator gen, int offset) {
|
|
DisasmProject proj = gen.Project;
|
|
Debug.Assert(proj.GetAnattrib(offset).IsInstructionStart);
|
|
|
|
FormatDescriptor dfd = proj.GetAnattrib(offset).DataDescriptor;
|
|
if (dfd == null || !dfd.HasSymbol) {
|
|
return -1;
|
|
}
|
|
return proj.FindLabelOffsetByName(dfd.SymbolRef.Label);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Configures some common format config items from the app settings. Uses a
|
|
/// passed-in settings object, rather than the global settings.
|
|
/// </summary>
|
|
/// <param name="settings">Application settings.</param>
|
|
/// <param name="config">Format config struct.</param>
|
|
public static void ConfigureFormatterFromSettings(AppSettings settings,
|
|
ref Formatter.FormatConfig config) {
|
|
config.mUpperHexDigits =
|
|
settings.GetBool(AppSettings.FMT_UPPER_HEX_DIGITS, false);
|
|
config.mUpperOpcodes =
|
|
settings.GetBool(AppSettings.FMT_UPPER_OP_MNEMONIC, false);
|
|
config.mUpperPseudoOpcodes =
|
|
settings.GetBool(AppSettings.FMT_UPPER_PSEUDO_OP_MNEMONIC, false);
|
|
config.mUpperOperandA =
|
|
settings.GetBool(AppSettings.FMT_UPPER_OPERAND_A, false);
|
|
config.mUpperOperandS =
|
|
settings.GetBool(AppSettings.FMT_UPPER_OPERAND_S, false);
|
|
config.mUpperOperandXY =
|
|
settings.GetBool(AppSettings.FMT_UPPER_OPERAND_XY, false);
|
|
config.mSpacesBetweenBytes =
|
|
settings.GetBool(AppSettings.FMT_SPACES_BETWEEN_BYTES, false);
|
|
config.mAddSpaceLongComment =
|
|
settings.GetBool(AppSettings.FMT_ADD_SPACE_FULL_COMMENT, true);
|
|
config.mOperandWrapLen =
|
|
settings.GetInt(AppSettings.FMT_OPERAND_WRAP_LEN, 0);
|
|
|
|
config.mForceAbsOpcodeSuffix =
|
|
settings.GetString(AppSettings.FMT_OPCODE_SUFFIX_ABS, string.Empty);
|
|
config.mForceLongOpcodeSuffix =
|
|
settings.GetString(AppSettings.FMT_OPCODE_SUFFIX_LONG, string.Empty);
|
|
config.mForceAbsOperandPrefix =
|
|
settings.GetString(AppSettings.FMT_OPERAND_PREFIX_ABS, string.Empty);
|
|
config.mForceLongOperandPrefix =
|
|
settings.GetString(AppSettings.FMT_OPERAND_PREFIX_LONG, string.Empty);
|
|
|
|
string exprMode = settings.GetString(AppSettings.FMT_EXPRESSION_MODE, string.Empty);
|
|
config.mExpressionMode = Formatter.FormatConfig.ParseExpressionMode(exprMode);
|
|
|
|
// Not doing the delimiter patterns here, because what's in the config file is
|
|
// intended for on-screen display, and hence likely to be unsuited for an assembler.
|
|
|
|
// Ditto for the local variable prefix.
|
|
}
|
|
|
|
/// <summary>
|
|
/// Checks to see if the junk alignment directive is compatible with the actual
|
|
/// address. This is used to screen out alignment values that no longer match up
|
|
/// with the actual addresses.
|
|
/// </summary>
|
|
/// <param name="offset">File offset of directive.</param>
|
|
/// <param name="dfd">Format descriptor.</param>
|
|
/// <param name="addrMap">Offset to address map.</param>
|
|
/// <returns>True if the .junk alignment directive is correct, false if it's
|
|
/// incorrect or not an alignment sub-type (e.g. None).</returns>
|
|
public static bool CheckJunkAlign(int offset, FormatDescriptor dfd,
|
|
CommonUtil.AddressMap addrMap) {
|
|
Debug.Assert(dfd.FormatType == FormatDescriptor.Type.Junk);
|
|
if (dfd.FormatSubType == FormatDescriptor.SubType.None) {
|
|
return false;
|
|
}
|
|
Debug.Assert(dfd.IsAlignedJunk);
|
|
|
|
// Just check the address. Shouldn't need to check the length.
|
|
int lastOffset = offset + dfd.Length - 1;
|
|
int alignToAddr = addrMap.OffsetToAddress(lastOffset) + 1;
|
|
int alignPwr = FormatDescriptor.AlignmentToPower(dfd.FormatSubType);
|
|
int alignMask = (1 << alignPwr) - 1;
|
|
bool result = (alignToAddr & alignMask) == 0;
|
|
//Debug.WriteLine(dfd.FormatSubType + " at +" + offset.ToString("x6") +
|
|
// "(" + alignToAddr.ToString("x4") + "): " + result);
|
|
return result;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Determines whether the project appears to have a PRG header.
|
|
/// </summary>
|
|
/// <param name="project">Project to check.</param>
|
|
/// <returns>True if we think we found a PRG header.</returns>
|
|
public static bool HasPrgHeader(DisasmProject project) {
|
|
if (project.FileDataLength < 3 || project.FileDataLength > 65536+2) {
|
|
// Must fit in 64KB of memory. A 65538-byte file will work if the
|
|
// first two bytes are the PRG header (and it starts at address zero).
|
|
//Debug.WriteLine("PRG test: incompatible file length");
|
|
return false;
|
|
}
|
|
Anattrib attr0 = project.GetAnattrib(0);
|
|
Anattrib attr1 = project.GetAnattrib(1);
|
|
if (!(attr0.IsDataStart && attr1.IsData)) {
|
|
//Debug.WriteLine("PRG test: +0/1 not data");
|
|
return false;
|
|
}
|
|
if (attr0.Length != 2) {
|
|
//Debug.WriteLine("PRG test: +0/1 not 16-bit value");
|
|
return false;
|
|
}
|
|
if (attr0.Symbol != null || attr1.Symbol != null) {
|
|
//Debug.WriteLine("PRG test: +0/1 has label");
|
|
return false;
|
|
}
|
|
// The first part of the address map should be a two-byte region, either added
|
|
// explicitly or a hole left at the start of the file. Address doesn't matter.
|
|
IEnumerator<AddressMap.AddressChange> iter = project.AddrMap.AddressChangeIterator;
|
|
if (!iter.MoveNext()) {
|
|
Debug.Assert(false);
|
|
return false;
|
|
}
|
|
AddressMap.AddressChange change = iter.Current;
|
|
if (change.Region.ActualLength != 2) {
|
|
Debug.WriteLine("PRG test: first entry is not a two-byte region");
|
|
}
|
|
// Confirm there's a single address map entry at offset 2. If there's more than
|
|
// one we likely have a situation where the first one is a "full-file" region, and
|
|
// the second determines the address. This weird scenario causes problems with
|
|
// code generation, so we just don't support it.
|
|
if (project.AddrMap.GetEntries(0x000002).Count != 1) {
|
|
//Debug.WriteLine("PRG test: wrong #of entries at +000002");
|
|
return false;
|
|
}
|
|
// See if the address at offset 2 matches the value at 0/1.
|
|
int value01 = project.FileData[0] | (project.FileData[1] << 8);
|
|
int addr2 = project.AddrMap.OffsetToAddress(0x000002);
|
|
if (value01 != addr2) {
|
|
//Debug.WriteLine("PRG test: +0/1 value is " + value01.ToString("x4") +
|
|
// ", address at +2 is " + addr2);
|
|
return false;
|
|
}
|
|
|
|
// TODO? confirm project fits in 64K of memory
|
|
|
|
return true;
|
|
}
|
|
}
|
|
}
|