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https://github.com/fadden/6502bench.git
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6892040ea8
First, make the per-segment comments and notes optional. Second, add an "offset segment by $0100" feature that tries to shift each segment forward 256 bytes. Doing so avoids potential ambiguity with direct page locations. The 20212-reloc-data test no longer has the per-segment comments.
632 lines
26 KiB
C#
632 lines
26 KiB
C#
/*
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* Copyright 2020 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.Diagnostics;
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using System.IO;
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using System.Text;
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using Asm65;
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using CommonUtil;
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namespace SourceGen.Tools.Omf {
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/// <summary>
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/// Apple IIgs OMF loader. This works like the GS/OS System Loader, reading the contents
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/// of an executable file and resolving the relocation records. This only handles Load
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/// files, as Object and Library files contain unresolved references.
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/// </summary>
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public class Loader {
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private const string IIGS_SYSTEM_DEF = "Apple IIgs (GS/OS)";
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[Flags]
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public enum Flags {
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AddNotes = 1 << 0,
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OffsetSegmentStart = 1 << 1,
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}
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private OmfFile mOmfFile;
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private Formatter mFormatter;
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private Flags mFlags;
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private byte[] mLoadedData;
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private DisasmProject mNewProject;
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private class SegmentMapEntry {
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public OmfSegment Segment { get; private set; }
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public int Address { get; private set; }
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public SegmentMapEntry(OmfSegment omfSeg, int address) {
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Segment = omfSeg;
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Address = address;
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}
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}
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private List<SegmentMapEntry> mSegmentMap;
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private Dictionary<int, DisasmProject.RelocData> mRelocData =
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new Dictionary<int, DisasmProject.RelocData>();
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="omfFile">OMF file to load.</param>
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/// <param name="formatter">Text formatter.</param>
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public Loader(OmfFile omfFile, Formatter formatter, Flags flags) {
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Debug.Assert(omfFile.OmfFileKind == OmfFile.FileKind.Load);
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mOmfFile = omfFile;
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mFormatter = formatter;
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mFlags = flags;
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}
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/// <summary>
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/// Prepares the loaded form of the binary and the disassembly project.
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/// </summary>
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public bool Prepare() {
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if (!CreateMap()) {
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mSegmentMap = null;
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return false;
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}
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Debug.WriteLine("Segment map:");
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for (int i = 0; i < mSegmentMap.Count; i++) {
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SegmentMapEntry ent = mSegmentMap[i];
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if (ent == null) {
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Debug.Assert(i == 0 || i == 1); // initial hole and optional ~ExpressLoad
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continue;
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}
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OmfSegment omfSeg = ent.Segment;
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Debug.WriteLine(i + " " + ent.Address.ToString("x6") + " SegNum=" + omfSeg.SegNum +
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" '" + omfSeg.SegName + "'");
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Debug.Assert(i == ent.Segment.SegNum);
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}
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if (!GenerateDataAndProject()) {
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mSegmentMap = null;
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return false;
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}
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return true;
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}
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/// <summary>
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/// Writes the data and disasm project files.
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/// </summary>
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/// <param name="dataPathName"></param>
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/// <param name="projectPathName"></param>
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public bool WriteProjectFiles(string dataPathName, string projectPathName,
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out string errMsg) {
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Debug.WriteLine("Writing " + dataPathName + " and " + projectPathName);
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using (FileStream fs = new FileStream(dataPathName, FileMode.Create)) {
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fs.Write(mLoadedData, 0, mLoadedData.Length);
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}
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if (!ProjectFile.SerializeToFile(mNewProject, projectPathName, out errMsg)) {
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return false;
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}
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return true;
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}
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/// <summary>
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/// Creates a map of file segments. The position of each segment in the list will
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/// match the segment's position in the file, i.e. the segment in Map[5] will have
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/// SEGNUM==5.
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/// </summary>
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/// <remarks>
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/// I'm assuming that the SEGNUM in the file matches the position. This seems to be
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/// the case everywhere. ExpressLoad goes to some lengths to ensure this is still the
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/// case after a file is "expressed", including a remap table so that loader calls made
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/// by the application go to the right place (instead of, say, giving ~ExpressLoad a
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/// SEGNUM of 255.)
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/// </remarks>
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/// <returns>True on success.</returns>
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private bool CreateMap() {
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// Segments are numbered 1-N, so create a map with N+1 entries and leave first blank.
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mSegmentMap = new List<SegmentMapEntry>(mOmfFile.SegmentList.Count + 1);
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mSegmentMap.Add(null);
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// Create a bank in-use map.
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bool[] inUse = new bool[256];
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// Flag special memory as in-use.
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inUse[0x00] = inUse[0x01] = inUse[0xe0] = inUse[0xe1] = true;
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// Find segments that require specific addresses, and mark those banks as in use.
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foreach (OmfSegment omfSeg in mOmfFile.SegmentList) {
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if (omfSeg.Kind == OmfSegment.SegmentKind.DpStack) {
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// This just allocates space in bank 0.
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continue;
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}
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if (omfSeg.Length == 0) {
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// Nothing to do here.
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continue;
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}
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int addr;
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if (omfSeg.Org == 0) {
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// The docs say that a value of zero always means relocatable, but that
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// would mean you can't set the "absolute bank" flag to position code or
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// data in bank 0. I'm going to assume that's intentional, since people
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// (a) shouldn't be doing that, and (b) can use DP/Stack instead (?).
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//
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// It also means that "bank relative" can't be used to set the position
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// to zero, which is probably fine since you can do that with ALIGN=$10000.
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continue;
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}
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addr = omfSeg.Org;
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if ((omfSeg.Attrs & OmfSegment.SegmentAttribute.AbsBank) != 0) {
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// Bank is specified, rest of address is not.
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addr &= 0x00ff0000;
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}
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// Mark the banks as being in use. It's okay if multiple segments want the
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// same space.
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MarkBanks(addr, omfSeg.Length, inUse);
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}
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//
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// Assign segments to banks. Note we always start at offset $0000 within a bank.
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//
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int nextBank = 0;
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int dpAddr = 0x1000; // somewhat arbitrary
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foreach (OmfSegment omfSeg in mOmfFile.SegmentList) {
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if (omfSeg.Kind == OmfSegment.SegmentKind.DpStack || omfSeg.Length == 0) {
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mSegmentMap.Add(new SegmentMapEntry(omfSeg, dpAddr));
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dpAddr += omfSeg.Length;
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if (dpAddr > 0x00010000) {
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Debug.WriteLine("Stack/DP overflow");
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return false;
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}
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continue;
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}
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if (omfSeg.IsExpressLoad) {
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// We totally ignore these. Add a null ref as a placeholder.
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mSegmentMap.Add(null);
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continue;
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}
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int addr;
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// We want to put the segment at a specific offset in an arbitrary bank
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// if ORG is nonzero, the BankRel flag is set, and the AbsBank flag is clear.
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bool bankRel = omfSeg.Org != 0 &&
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(omfSeg.Attrs & OmfSegment.SegmentAttribute.BankRel) != 0 &&
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(omfSeg.Attrs & OmfSegment.SegmentAttribute.AbsBank) == 0;
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// We want to put the segment at an arbitrary offset in a specific bank
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// if ORG is nonzero, the BankRel flag is clear, and the AbsBank flag is set.
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bool fixedBank = omfSeg.Org != 0 &&
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(omfSeg.Attrs & OmfSegment.SegmentAttribute.BankRel) == 0 &&
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(omfSeg.Attrs & OmfSegment.SegmentAttribute.AbsBank) != 0;
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// We want to put the segment at a specific offset and bank
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// if ORG is nonzero, and BankRel and FixedBank are either both set or
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// both clear.
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bool fixedAddr = omfSeg.Org != 0 && (bankRel ^ fixedBank) == false;
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if (fixedAddr || fixedBank) {
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// Specific bank requested.
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addr = omfSeg.Org;
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if ((omfSeg.Attrs & OmfSegment.SegmentAttribute.AbsBank) != 0) {
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// just keep the bank
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addr &= 0x00ff0000;
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}
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} else {
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// Find next available bank with enough space.
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while (true) {
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while (nextBank < 256 && inUse[nextBank]) {
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nextBank++;
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}
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if (nextBank == 256) {
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// Should be impossible on any sane Apple IIgs Load file.
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Debug.Assert(false);
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return false;
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}
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if (!CheckBanks(nextBank << 16, omfSeg.Length, inUse)) {
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// Didn't fit in the space.
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nextBank++;
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continue;
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}
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// We only go forward, so no need to mark them.
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break;
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}
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addr = nextBank << 16;
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if (bankRel) {
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// TODO(maybe): reject if incompatible with BANKSIZE
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addr |= omfSeg.Org & 0x0000ffff;
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}
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// Advance nextBank. We do this by identifying the last address touched,
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// then incrementing the bank number.
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int lastAddr = addr + omfSeg.Length - 1;
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nextBank = (lastAddr >> 16) + 1;
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if (nextBank >= 0x0100) {
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// Overflowed the 65816 address space.
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Debug.WriteLine("Bank exceeded $ff");
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return false;
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}
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}
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// If possible, shift the address to xx/$0100. This is useful because it means
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// we won't have to put width disambiguators on any data accesses to $00xx
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// locations. We can't do this if the address is fixed, aligned to a 64K
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// boundary, or is too large.
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if ((mFlags & Flags.OffsetSegmentStart) != 0 && !fixedAddr && !bankRel &&
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omfSeg.Align <= 0x0100 && omfSeg.Length <= (65536-256)) {
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if ((addr & 0x0000ffff) == 0x0000) {
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addr |= 0x0100;
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} else {
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Debug.Assert(false, "Unexpected nonzero bank address found");
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}
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}
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SegmentMapEntry ent = new SegmentMapEntry(omfSeg, addr);
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mSegmentMap.Add(ent);
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}
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return true;
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}
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private static bool CheckBanks(int addr, int memLen, bool[] inUse) {
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Debug.Assert(memLen > 0);
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while (memLen > 0) {
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if (inUse[(addr >> 16) & 0xff]) {
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return false;
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}
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addr += 65536;
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memLen -= 65536;
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}
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return true;
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}
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private static bool MarkBanks(int addr, int memLen, bool[] inUse) {
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Debug.Assert(memLen > 0);
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while (memLen > 0) {
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inUse[(addr >> 16) & 0xff] = true;
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addr += 65536;
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memLen -= 65536;
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}
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return true;
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}
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private bool GenerateDataAndProject() {
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// Sum up the segment lengths to get the total project size.
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int totalLen = 0;
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foreach (SegmentMapEntry ent in mSegmentMap) {
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if (ent == null) {
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continue;
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}
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totalLen += ent.Segment.Length;
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}
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Debug.WriteLine("Total length of loaded binary is " + totalLen);
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byte[] data = new byte[totalLen];
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// Create the project object.
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DisasmProject proj = new DisasmProject();
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proj.Initialize(data.Length);
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// Try to get the Apple IIgs system definition. This is fragile, because it
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// relies on the name in the JSON file, but it's optional. (If the default CPU
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// type stops being 65816, we should be sure to set that here.)
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try {
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// TODO(maybe): encapsulate this somewhere else
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string sysDefsPath = RuntimeDataAccess.GetPathName("SystemDefs.json");
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SystemDefSet sds = SystemDefSet.ReadFile(sysDefsPath);
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SystemDef sd = sds.FindEntryByName(IIGS_SYSTEM_DEF);
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if (sd != null) {
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proj.ApplySystemDef(sd);
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} else {
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Debug.WriteLine("Unable to find Apple IIgs system definition");
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}
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} catch (Exception) {
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// never mind
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Debug.WriteLine("Failed to apply Apple IIgs system definition");
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}
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ChangeSet cs = new ChangeSet(mSegmentMap.Count * 2);
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AddHeaderComment(proj, cs);
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UndoableChange uc;
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// Load the segments, and add entries to the project.
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int bufOffset = 0;
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foreach (SegmentMapEntry ent in mSegmentMap) {
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if (ent == null) {
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continue;
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}
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if (ent.Segment.Kind == OmfSegment.SegmentKind.JumpTable) {
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if (!RelocJumpTable(ent, data, bufOffset, cs)) {
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// Could treat this as non-fatal, but it really ought to work.
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Debug.WriteLine("Jump Table reloc failed");
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return false;
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}
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} else {
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// Perform relocation.
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if (!RelocSegment(ent, data, bufOffset)) {
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return false;
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}
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}
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// Add one or more address entries. (Normally one, but data segments
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// can straddle multiple pages.)
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AddAddressEntries(proj, ent, bufOffset, cs);
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if ((mFlags & Flags.AddNotes) != 0) {
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// Add a comment identifying the segment and its attributes.
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string segCmt = string.Format(Res.Strings.OMF_SEG_COMMENT_FMT,
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ent.Segment.SegNum, ent.Segment.Kind, ent.Segment.Attrs, ent.Segment.SegName);
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uc = UndoableChange.CreateLongCommentChange(bufOffset, null,
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new MultiLineComment(segCmt));
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cs.Add(uc);
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// Add a note identifying the segment.
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string segNote = string.Format(Res.Strings.OMF_SEG_NOTE_FMT,
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ent.Segment.SegNum, mFormatter.FormatAddress(ent.Address, true),
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ent.Segment.SegName);
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uc = UndoableChange.CreateNoteChange(bufOffset, null,
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new MultiLineComment(segNote));
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cs.Add(uc);
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}
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bufOffset += ent.Segment.Length;
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}
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proj.PrepForNew(data, "new_proj");
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foreach (KeyValuePair<int, DisasmProject.RelocData> kvp in mRelocData) {
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proj.RelocList.Add(kvp.Key, kvp.Value);
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}
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// Enable "use reloc" in the analysis parameters.
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ProjectProperties newProps = new ProjectProperties(proj.ProjectProps);
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newProps.AnalysisParams.UseRelocData = true;
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uc = UndoableChange.CreateProjectPropertiesChange(proj.ProjectProps, newProps);
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cs.Add(uc);
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// TODO(someday): by default we apply a code hint to offset 0 of the first
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// segment. The placement should take the segment's ENTRY into account.
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Debug.WriteLine("Applying " + cs.Count + " changes");
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proj.ApplyChanges(cs, false, out _);
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mLoadedData = data;
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mNewProject = proj;
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return true;
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}
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private void AddHeaderComment(DisasmProject proj, ChangeSet cs) {
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// Add header comment.
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StringBuilder sb = new StringBuilder();
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sb.AppendLine(string.Format(Res.Strings.DEFAULT_HEADER_COMMENT_FMT,
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App.ProgramVersion));
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sb.AppendLine();
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foreach (SegmentMapEntry ent in mSegmentMap) {
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if (ent == null) {
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continue;
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}
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string segCmt = string.Format(Res.Strings.OMF_SEG_HDR_COMMENT_FMT,
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ent.Segment.SegNum, ent.Segment.Kind, ent.Segment.SegName,
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mFormatter.FormatAddress(ent.Address, true), ent.Segment.Length);
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sb.AppendLine(segCmt);
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}
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UndoableChange uc = UndoableChange.CreateLongCommentChange(
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LineListGen.Line.HEADER_COMMENT_OFFSET,
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null, new MultiLineComment(sb.ToString()));
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cs.Add(uc);
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}
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/// <summary>
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/// Edits the data file, changing values based on the relocation dictionary.
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/// </summary>
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private bool RelocSegment(SegmentMapEntry ent, byte[] data, int bufOffset) {
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const int INVALID_ADDR = 0x00ffffff;
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byte[] srcData = ent.Segment.GetConstData();
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Array.Copy(srcData, 0, data, bufOffset, srcData.Length);
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foreach (OmfReloc omfRel in ent.Segment.Relocs) {
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int relocAddr = omfRel.RelOffset;
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if (omfRel.FileNum != -1 && omfRel.FileNum != 1) {
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// Some other file; not much we can do with this. Drop in an obviously
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// invalid address and keep going.
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Debug.WriteLine("Unable to process reloc with FileNum=" + omfRel.FileNum);
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relocAddr = INVALID_ADDR;
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} else if (omfRel.SegNum == -1) {
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// Within this segment.
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relocAddr += ent.Address;
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} else {
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// Find other segment. This may fail if the file is damaged.
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if (omfRel.SegNum < 0 || omfRel.SegNum >= mSegmentMap.Count ||
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mSegmentMap[omfRel.SegNum] == null) {
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// Can't find the segment. Unlike the file case, this was expected to
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// be something we could resolve with what we were given, so this is
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// a hard failure.
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Debug.WriteLine("Reloc SegNum=" + omfRel.SegNum + " not in map");
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return false;
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} else {
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relocAddr += mSegmentMap[omfRel.SegNum].Address;
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}
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}
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if (omfRel.Shift < -32 || omfRel.Shift > 32) {
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Debug.WriteLine("Invalid reloc shift " + omfRel.Shift);
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return false;
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}
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int adjRelocAddr = relocAddr;
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if (omfRel.Shift < 0) {
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adjRelocAddr >>= -omfRel.Shift;
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} else if (omfRel.Shift > 0) {
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adjRelocAddr <<= omfRel.Shift;
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}
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switch (omfRel.Width) {
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case 1:
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data[bufOffset + omfRel.Offset] = (byte)(adjRelocAddr);
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break;
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case 2:
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data[bufOffset + omfRel.Offset] = (byte)(adjRelocAddr);
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data[bufOffset + omfRel.Offset + 1] = (byte)(adjRelocAddr >> 8);
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break;
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case 3:
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data[bufOffset + omfRel.Offset] = (byte)(adjRelocAddr);
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data[bufOffset + omfRel.Offset + 1] = (byte)(adjRelocAddr >> 8);
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data[bufOffset + omfRel.Offset + 2] = (byte)(adjRelocAddr >> 16);
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break;
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case 4:
|
|
data[bufOffset + omfRel.Offset] = (byte)(adjRelocAddr);
|
|
data[bufOffset + omfRel.Offset + 1] = (byte)(adjRelocAddr >> 8);
|
|
data[bufOffset + omfRel.Offset + 2] = (byte)(adjRelocAddr >> 16);
|
|
data[bufOffset + omfRel.Offset + 3] = (byte)(adjRelocAddr >> 24);
|
|
break;
|
|
default:
|
|
Debug.WriteLine("Invalid reloc width " + omfRel.Width);
|
|
return false;
|
|
}
|
|
|
|
mRelocData.Add(bufOffset + omfRel.Offset, new DisasmProject.RelocData(
|
|
(byte)omfRel.Width, (sbyte)omfRel.Shift, relocAddr));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Edits the data file, essentially putting the jump table entries into the
|
|
/// "loaded" state.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// We don't use ent.Segment.Relocs, as that is expected to be empty.
|
|
/// </remarks>
|
|
private bool RelocJumpTable(SegmentMapEntry ent, byte[] data, int bufOffset,
|
|
ChangeSet cs) {
|
|
const int ENTRY_LEN = 14;
|
|
|
|
if (ent.Segment.Relocs.Count != 0) {
|
|
Debug.WriteLine("WEIRD: jump table has reloc data?");
|
|
}
|
|
|
|
byte[] srcData = ent.Segment.GetConstData();
|
|
Array.Copy(srcData, 0, data, bufOffset, srcData.Length);
|
|
|
|
// For no documented reason, jump tables start with 8 zero bytes.
|
|
for (int i = 0; i < 8; i++) {
|
|
if (data[bufOffset + i] != 0) {
|
|
Debug.WriteLine("JumpTab: missing 8-byte header");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
TypedRangeSet newSet = new TypedRangeSet();
|
|
TypedRangeSet undoSet = new TypedRangeSet();
|
|
|
|
for (int i = 8; i + 4 <= ent.Segment.Length; i += ENTRY_LEN) {
|
|
//int userId = RawData.GetWord(data, bufOffset + i, 2, false);
|
|
int fileNum = RawData.GetWord(data, bufOffset + i + 2, 2, false);
|
|
|
|
if (fileNum == 0) {
|
|
// A zero file number indicates end of table.
|
|
Debug.WriteLine("JumpTab: found fileNum=0 at offset " + i + ", len=" +
|
|
ent.Segment.Length);
|
|
break;
|
|
} else if (fileNum != 1) {
|
|
// External file, ignore entry.
|
|
Debug.WriteLine("JumpTab: ignoring entry with FileNum=" + fileNum);
|
|
continue;
|
|
} else if (i + ENTRY_LEN > ent.Segment.Length) {
|
|
// Make sure the rest fits.
|
|
Debug.WriteLine("JumpTab: overran buffer");
|
|
return false;
|
|
}
|
|
|
|
// Note: segment might end right after FileNum, so don't try to read further
|
|
// until we've confirmed that FileNum != 0.
|
|
|
|
int segNum = RawData.GetWord(data, bufOffset + i + 4, 2, false);
|
|
int segOff = RawData.GetWord(data, bufOffset + i + 6, 4, false);
|
|
|
|
if (segNum < 0 || segNum >= mSegmentMap.Count || mSegmentMap[segNum] == null) {
|
|
Debug.WriteLine("JumpTab: invalid SegNum=" + segNum);
|
|
return false;
|
|
}
|
|
if (data[bufOffset + i + 10] != 0x22) {
|
|
Debug.WriteLine("JumpTab: did not find expected JSL at off=" + i);
|
|
return false;
|
|
}
|
|
|
|
int addr = mSegmentMap[segNum].Address + segOff;
|
|
int jmlOffset = bufOffset + i + 10;
|
|
data[jmlOffset] = 0x5c; // JML
|
|
data[jmlOffset + 1] = (byte)addr;
|
|
data[jmlOffset + 2] = (byte)(addr >> 8);
|
|
data[jmlOffset + 3] = (byte)(addr >> 16);
|
|
//Debug.WriteLine("JumpTab: off=" + i + " -> " +
|
|
// mFormatter.FormatAddress(addr, true));
|
|
|
|
// It seems to be fairly common for jump table entries to not be referenced
|
|
// from the program, which can leave whole dynamic segments unreferenced. Set
|
|
// a code hint on the JML instruction.
|
|
undoSet.Add(jmlOffset, (int)CodeAnalysis.TypeHint.NoHint);
|
|
newSet.Add(jmlOffset, (int)CodeAnalysis.TypeHint.Code);
|
|
}
|
|
|
|
UndoableChange uc = UndoableChange.CreateTypeHintChange(undoSet, newSet);
|
|
cs.Add(uc);
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Adds one or more entries to the address map for the specified segment.
|
|
/// </summary>
|
|
private static void AddAddressEntries(DisasmProject proj, SegmentMapEntry ent,
|
|
int bufOffset, ChangeSet cs) {
|
|
int addr = ent.Address;
|
|
int segRem = ent.Segment.Length;
|
|
|
|
while (true) {
|
|
// Generate an ORG directive.
|
|
int origAddr = proj.AddrMap.Get(bufOffset);
|
|
UndoableChange uc = UndoableChange.CreateAddressChange(bufOffset,
|
|
origAddr, addr);
|
|
cs.Add(uc);
|
|
|
|
// Compare amount of space in this bank to amount left in segment.
|
|
int bankRem = 0x00010000 - (addr & 0xffff);
|
|
if (bankRem > segRem) {
|
|
// All done, bail.
|
|
break;
|
|
}
|
|
|
|
// Advance to start of next bank.
|
|
addr += bankRem;
|
|
Debug.Assert((addr & 0x0000ffff) == 0);
|
|
bufOffset += bankRem;
|
|
segRem -= bankRem;
|
|
Debug.WriteLine("Adding additional ORG at " + addr);
|
|
}
|
|
}
|
|
}
|
|
}
|