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https://github.com/fadden/6502bench.git
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267 lines
10 KiB
C#
267 lines
10 KiB
C#
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/*
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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 CommonUtil;
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namespace SourceGen.Tools.Omf {
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/// <summary>
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/// Apple IIgs OMF relocation entry. These are generated from OMF relocation records.
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/// Note that SUPER records may generate multiple instances of these.
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/// </summary>
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public class OmfReloc {
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/// <summary>
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/// Number of bytes to be relocated.
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/// </summary>
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public int Width { get; private set; }
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/// <summary>
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/// Number of bits to shift the result before storing. Positive values shift left,
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/// negative values shift right (unsigned).
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/// </summary>
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public int Shift { get; private set; }
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/// <summary>
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/// Offset within segment of bytes to rewrite.
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/// </summary>
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public int Offset { get; private set; }
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/// <summary>
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/// Relative offset of the thing being referenced. The segment's address in memory
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/// is added to this to yield the final value.
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/// </summary>
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public int RelOffset { get; private set; }
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/// <summary>
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/// File number of target segment. Normally 1. Will be -1 for intra-segment relocs.
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/// </summary>
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public int FileNum { get; private set; }
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/// <summary>
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/// Segment number of target segment. Will be -1 for intra-segment relocs.
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/// </summary>
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public int SegNum { get; private set; }
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/// <summary>
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/// Set to the SUPER type, or -1 if this record was not from a SUPER.
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/// </summary>
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public int SuperType { get; private set; }
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/// <summary>
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/// Constructor for RELOC/cRELOC.
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/// </summary>
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/// <param name="width">Width in bytes of relocation.</param>
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/// <param name="shift">Bit-shift amount.</param>
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/// <param name="offset">Offset within segment of relocation.</param>
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/// <param name="relOffset">Relative offset of relocation reference.</param>
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/// <param name="fromSuper">True if generated from SUPER.</param>
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private OmfReloc(int width, int shift, int offset, int relOffset, int superType) {
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FileNum = SegNum = -1;
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Width = width;
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Shift = shift;
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Offset = offset;
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RelOffset = relOffset;
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SuperType = superType;
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}
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/// <summary>
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/// Constructor for INTERSEG/cINTERSEG.
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/// </summary>
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/// <param name="width">Width in bytes of relocation.</param>
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/// <param name="shift">Bit-shift amount.</param>
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/// <param name="offset">Offset within segment of relocation.</param>
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/// <param name="relOffset">Relative offset of relocation reference.</param>
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/// <param name="fileNum">File number.</param>
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/// <param name="segNum">Segment number.</param>
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/// <param name="fromSuper">True if generated from SUPER.</param>
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private OmfReloc(int width, int shift, int offset, int relOffset, int fileNum,
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int segNum, int superType) {
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Width = width;
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Shift = shift;
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Offset = offset;
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RelOffset = relOffset;
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FileNum = fileNum;
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SegNum = segNum;
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SuperType = superType;
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}
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/// <summary>
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/// Adds one or more OmfReloc instances to the list to represent the provided record.
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/// </summary>
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/// <param name="omfSeg">Segment that contains the record.</param>
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/// <param name="omfRec">Record to add.</param>
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/// <param name="data">File data.</param>
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/// <param name="relocs">List of relocations. New entries will be appended.</param>
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/// <returns>True on success.</returns>
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public static bool GenerateRelocs(OmfSegment omfSeg, OmfRecord omfRec, byte[] data,
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List<OmfReloc> relocs) {
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try {
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return DoGenerateRelocs(omfSeg, omfRec, data, relocs);
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} catch (IndexOutOfRangeException ioore) {
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Debug.WriteLine("Caught IOORE during reloc gen (" + omfRec.Op + "): " +
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ioore.Message);
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return false;
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}
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}
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/// <summary>
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/// Adds one or more OmfReloc instances to the list to represent the provided record.
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/// </summary>
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private static bool DoGenerateRelocs(OmfSegment omfSeg, OmfRecord omfRec, byte[] data,
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List<OmfReloc> relocs) {
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int offset = omfRec.FileOffset;
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Debug.Assert(data[offset] == (int)omfRec.Op);
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switch (omfRec.Op) {
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case OmfRecord.Opcode.RELOC: {
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byte width = data[offset + 1];
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sbyte shift = (sbyte)data[offset + 2];
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int off = RawData.GetWord(data, offset + 3, 4, false);
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int relOff = RawData.GetWord(data, offset + 7, 4, false);
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relocs.Add(new OmfReloc(width, shift, off, relOff, -1));
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}
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break;
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case OmfRecord.Opcode.cRELOC: {
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byte width = data[offset + 1];
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sbyte shift = (sbyte)data[offset + 2];
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int off = RawData.GetWord(data, offset + 3, 2, false);
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int relOff = RawData.GetWord(data, offset + 5, 2, false);
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relocs.Add(new OmfReloc(width, shift, off, relOff, -1));
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}
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break;
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case OmfRecord.Opcode.INTERSEG: {
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byte width = data[offset + 1];
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sbyte shift = (sbyte)data[offset + 2];
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int off = RawData.GetWord(data, offset + 3, 4, false);
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int fileNum = RawData.GetWord(data, offset + 7, 2, false);
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int segNum = RawData.GetWord(data, offset + 9, 2, false);
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int relOff = RawData.GetWord(data, offset + 11, 4, false);
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relocs.Add(new OmfReloc(width, shift, off, relOff, fileNum, segNum, -1));
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}
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break;
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case OmfRecord.Opcode.cINTERSEG: {
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byte width = data[offset + 1];
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sbyte shift = (sbyte)data[offset + 2];
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int off = RawData.GetWord(data, offset + 3, 2, false);
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int fileNum = 1;
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int segNum = data[offset + 5];
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int relOff = RawData.GetWord(data, offset + 6, 2, false);
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relocs.Add(new OmfReloc(width, shift, off, relOff, fileNum, segNum, -1));
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}
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break;
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case OmfRecord.Opcode.SUPER:
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if (!GenerateRelocForSuper(omfSeg, omfRec, data, relocs)) {
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return false;
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}
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break;
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default:
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Debug.Assert(false);
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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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/// Generates a series of relocation items for a SUPER record.
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/// </summary>
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private static bool GenerateRelocForSuper(OmfSegment omfSeg, OmfRecord omfRec, byte[] data,
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List<OmfReloc> relocs) {
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int offset = omfRec.FileOffset;
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int remaining = RawData.GetWord(data, offset + 1, 4, false);
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int type = data[offset + 5];
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offset += 6; // we've consumed 6 bytes
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remaining--; // ...but only 1 counts against the SUPER length
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int width, shift, fileNum, segNum;
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bool needSegNum = false;
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if (type == 0) {
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// SUPER RELOC2
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width = 2;
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shift = 0;
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fileNum = segNum = -1;
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} else if (type == 1) {
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// SUPER RELOC3
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width = 3;
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shift = 0;
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fileNum = segNum = -1;
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} else if (type >= 2 && type <= 13) {
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// SUPER INTERSEG1 - SUPER INTERSEG12
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width = 3;
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shift = 0;
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fileNum = type - 1;
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segNum = -100;
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needSegNum = true;
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} else if (type >= 14 && type <= 25) {
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// SUPER INTERSEG13 - SUPER INTERSEG24
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width = 2;
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shift = 0;
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fileNum = 1;
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segNum = type - 13;
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} else if (type >= 26 && type <= 37) {
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// SUPER INTERSEG25 - SUPER INTERSEG36
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width = 2;
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shift = -16; // right shift
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fileNum = 1;
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segNum = type - 25;
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} else {
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return false;
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}
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int page = 0;
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while (remaining > 0) {
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int patchCount = data[offset++];
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remaining--;
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if ((patchCount & 0x80) != 0) {
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// high bit set, this is a skip-count
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page += (patchCount & 0x7f);
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continue;
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}
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patchCount++; // zero means one patch
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while (patchCount-- != 0) {
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int patchOff = data[offset++];
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remaining--;
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int relocOff = page * 256 + patchOff;
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byte[] constData = omfSeg.GetConstData();
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int relocRelOff = RawData.GetWord(constData, relocOff, 2, false);
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if (needSegNum) {
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segNum = constData[relocOff + 2];
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}
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relocs.Add(new OmfReloc(width, shift, relocOff, relocRelOff,
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fileNum, segNum, type));
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}
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page++;
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}
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if (remaining < 0) {
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Debug.WriteLine("Ran off end of SUPER record");
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Debug.Assert(false);
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return false;
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}
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return true;
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}
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}
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}
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