public void A5Relocator_Skip_Repeat()
{
Given_Relocator();
var w = new BeImageWriter(mem.Bytes, 0);
w.WriteByte(0x00); // Skip 2 halfwords.
w.WriteByte(0x02);
w.WriteByte(0x03); // Repeat 3
w = new BeImageWriter(mem.Bytes, 1024);
w.WriteBeUInt32(0xFFFF0000u);
w.WriteBeUInt32(0x00010000);
w.WriteBeUInt32(0x00010004);
w.WriteBeUInt32(0x00010008);
w.WriteBeUInt32(0xFFFF0000u);
relocator.Relocate();
var r = mem.CreateBeReader(1024);
Assert.AreEqual(0xFFFF0000u, r.ReadBeUInt32());
Assert.AreEqual(0x00110800u, r.ReadBeUInt32());
Assert.AreEqual(0x00110804u, r.ReadBeUInt32());
Assert.AreEqual(0x00110808u, r.ReadBeUInt32());
Assert.AreEqual(0xFFFF0000u, r.ReadBeUInt32());
}
private byte[] FlattenSymbolTable()
{
var syms = new BeImageWriter();
foreach (var sym in symbols)
{
syms.WriteBeUInt32(sym.st_name);
syms.WriteBeUInt32(sym.st_value);
syms.WriteBeUInt32(sym.st_size);
syms.WriteByte(sym.st_info);
syms.WriteByte(sym.st_other);
syms.WriteBeUInt16(sym.st_shndx);
}
return(syms.ToArray());
}
/// <summary>
/// Builds the MacOS A5World, based on the contents of the jump table in CODE#0.
/// </summary>
/// <param name="jt"></param>
/// <param name="addr"></param>
/// <param name="codeSegs"></param>
/// <returns></returns>
public ImageSegment LoadA5World(
JumpTable jt,
Address addr,
Dictionary <int, ImageSegment> codeSegs,
SortedList <Address, ImageSymbol> symbols)
{
var size = jt.BelowA5Size + jt.AboveA5Size;
var mem = new MemoryArea(addr, new byte[size]);
var w = new BeImageWriter(mem, jt.BelowA5Size + jt.JumpTableOffset);
int i = 0;
foreach (var entry in jt.Entries)
{
w.WriteBeUInt16(entry.RoutineOffsetFromSegmentStart);
int iSeg = (ushort)entry.Instruction;
var targetSeg = codeSegs[iSeg];
var addrDst = targetSeg.Address + entry.RoutineOffsetFromSegmentStart;
if (!symbols.ContainsKey(addrDst))
{
symbols.Add(addrDst, ImageSymbol.Procedure(arch, addrDst));
}
w.WriteBeUInt16(0x4EF9); // jmp (xxxxxxxxx).L
w.WriteBeUInt32(addrDst.ToUInt32());
++i;
}
return(new ImageSegment("A5World", mem, AccessMode.ReadWriteExecute));
}
private static void WriteString(string s, BeImageWriter w)
{
if (s.Length <= 0)
{
w.WriteBeUInt32(0);
return;
}
byte[] ab = enc.GetBytes(s);
int padLength = (ab.Length + 3) & ~3;
w.WriteBeUInt32((uint)padLength / 4);
w.WriteBytes(ab);
int cPad = padLength - ab.Length;
while (--cPad >= 0)
{
w.WriteByte(0);
}
}
private void Given_BE32_GOT(params uint[] aPointers)
{
var writer = new BeImageWriter();
foreach (var ptr in aPointers)
{
writer.WriteBeUInt32(ptr);
}
var mem = new MemoryArea(Address.Ptr32(0x10000000), writer.ToArray());
program.SegmentMap.AddSegment(mem, ".got", AccessMode.ReadWriteExecute);
arch.Setup(a => a.CreateImageReader(
It.IsNotNull<MemoryArea>(),
mem.BaseAddress))
.Returns(new BeImageReader(mem, 0));
}
public void A5Relocator_One()
{
Given_Relocator();
var w = new BeImageWriter(mem.Bytes, 0);
w.WriteByte(0x80); // Skip 0.
w.WriteByte(0x00);
w = new BeImageWriter(mem.Bytes, 1024);
w.WriteBeUInt32(0x00123400);
relocator.Relocate();
var r = mem.CreateBeReader(1024);
var uRelocated = r.ReadBeUInt32();
Assert.AreEqual(0x00223C00u, uRelocated);
}
private void Given_Code(params uint [] uInstrs)
{
var writer = new BeImageWriter();
foreach (uint uInstr in uInstrs)
{
writer.WriteBeUInt32(uInstr);
}
var mem = new ByteMemoryArea(Address.Ptr64(0x0010_0000), writer.ToArray());
var seg = new ImageSegment("code", mem, AccessMode.ReadWriteExecute);
var segmap = new SegmentMap(mem.BaseAddress, seg);
var program = new Program(segmap, arch, new DefaultPlatform(sc, arch));
var envEmu = new DefaultPlatformEmulator();
emu = (Reko.Arch.PowerPC.PowerPcEmulator)arch.CreateEmulator(segmap, envEmu);
emu.InstructionPointer = program.ImageMap.BaseAddress;
emu.ExceptionRaised += (sender, e) => { throw e.Exception; };
}
public void MacOS_ResolveIndirectCall()
{
var macOS = new MacOSClassic(null, new M68kArchitecture("m68k"));
var a5 = new Identifier(Registers.a5.Name, Registers.a5.DataType, Registers.a5);
var a5world = new MemoryArea(Address.Ptr32(0x00100000), new byte[0x0300]);
macOS.A5World = new ImageSegment("A5World", a5world, AccessMode.ReadWrite);
macOS.A5Offset = 0x0100u;
const int jumpTableOffset = 0x0032;
const uint uAddrDirect = 0x00123400u;
var w = new BeImageWriter(a5world, macOS.A5Offset + jumpTableOffset);
w.WriteBeUInt16(0x4EF9); // jmp... (not really necessary for the test but hey....);
w.WriteBeUInt32(uAddrDirect);
var m = new RtlEmitter(null);
var instr = new RtlCall(m.IAdd(a5, jumpTableOffset), 4, RtlClass.Call);
var addr = macOS.ResolveIndirectCall(instr);
Assert.AreEqual(uAddrDirect, addr.ToUInt32());
}
protected void BuildObjectFile32()
{
// Add symbol table
if (symbols.Count > 0)
{
Given_Section(".symtab", SectionHeaderType.SHT_SYMTAB, ElfLoader.SHF_ALLOC, FlattenSymbolTable());
var os = objectSections[objectSections.Count - 1];
os.ElementSize = Elf32_Sym.Size;
os.Link = (ushort)objectSections.Count;
Given_Section(".strtab", SectionHeaderType.SHT_STRTAB, ElfLoader.SHF_ALLOC, symbolStringtab.ToArray());
}
var bin = new BeImageWriter();
bin.WriteByte(0x7F);
bin.WriteBytes(new byte[] { 0x45, 0x4C, 0x46 });
bin.WriteByte(1); // 32-bit
bin.WriteByte(2); // big-endian
bin.WriteByte(1); // ELF version
bin.WriteByte(0); // OS ABI
bin.WriteByte(0); // OS version
bin.WriteBytes(0, 7); // pad
// ELF header
bin.WriteBeUInt16(1); // relocatable
bin.WriteBeUInt16((ushort)ElfMachine.EM_SPARC);
bin.WriteBeUInt32(1); // version
bin.WriteBeUInt32(0); // entry point (none in reloc file)
bin.WriteBeUInt32(0); // program segment table offset (none in reloc file)
bin.WriteBeUInt32((uint)bin.Position + 20); // point to section table.
bin.WriteBeUInt32(0); // e_flags;
bin.WriteBeUInt16(0); // e_ehsize;
bin.WriteBeUInt16((ushort)Elf32_PHdr.Size); // e_phentsize;
bin.WriteBeUInt16((ushort)progHeaders.Count); // e_phnum;
bin.WriteBeUInt16(0); // e_shentsize;
bin.WriteBeUInt16((ushort)objectSections.Count); // e_shnum;
bin.WriteBeUInt16(1); // e_shstrndx;
// Build string table.
var strtab = new MemoryStream();
var mpOsToiName = new Dictionary <ObjectSection, int>();
foreach (var os in this.objectSections)
{
mpOsToiName[os] = (int)strtab.Position;
var bytes = Encoding.ASCII.GetBytes(os.Name);
strtab.Write(bytes, 0, bytes.Length);
strtab.WriteByte(0);
}
// Reserve space for program header table and
// section table.
var iProgHdrTable = (uint)bin.Position;
var iShTable = (uint)bin.Position + (uint)(progHeaders.Count * Elf32_PHdr.Size);
var iStrTable = iShTable + (uint)(40 * objectSections.Count);
// Write string table
var aStrtable = strtab.ToArray();
objectSections[1].Content = aStrtable;
var iContent = iStrTable;
// Place remaining sections.
foreach (var section in objectSections.Skip(1))
{
section.Offset = iContent;
iContent = Align((uint)(iContent + section.Content.Length));
}
// Write the program header table
foreach (var ph in this.progHeaders)
{
bin.WriteBeUInt32((uint)ph.Type);
bin.WriteBeUInt32(ph.Offset);
bin.WriteBeUInt32(ph.VirtualAddress);
bin.WriteBeUInt32(0);
bin.WriteBeUInt32((uint)ph.Content.Length);
bin.WriteBeUInt32(ph.AllocateSize);
bin.WriteBeUInt32(ph.Flags);
bin.WriteBeUInt32(ph.Alignment);
}
// Write the section table.
foreach (var os in this.objectSections)
{
bin.WriteBeUInt32((uint)mpOsToiName[os]);
bin.WriteBeUInt32((uint)os.Type);
bin.WriteBeUInt32(os.Flags);
bin.WriteBeUInt32(0);
bin.WriteBeUInt32(os.Offset);
bin.WriteBeUInt32(os.Content != null ? (uint)os.Content.Length : 0u);
bin.WriteBeUInt32(os.Link);
bin.WriteBeUInt32(0);
bin.WriteBeUInt32(0);
bin.WriteBeUInt32(os.ElementSize);
}
// write the non-null sections.
foreach (var section in objectSections.Skip(1))
{
bin.WriteBytes(section.Content);
Align(bin);
}
this.rawBytes = bin.ToArray();
}
public void Relocate()
{
var memA5 = (ByteMemoryArea)platform.A5World.MemoryArea;
var a5belowWriter = new BeImageWriter(memA5, 0);
var a5belowReader = new BeImageReader(memA5, 0);
uint a5globalOffset = platform.A5Offset - a5dbelow;
var a5WorldAddress = (UInt32)((platform.A5World.Address.Offset + platform.A5Offset) & 0xFFFFFFFF);
// set Repeat count = 1, reset after each completed copy cycle
// byte token lower 4 bits number of words to copy from compressed data
// byte token upper 4 bits number of words to skip in global application data space
// if either value is 0 then get run length value which is in bytes.
// if the new run length value for copy is 0 then it's the end of compression data.
for (;;)
{
int a5repeat = 1;
// Skip is number of 16-bit words to skip
uint a5globalSkip = a5dr.ReadByte();
if (a5globalSkip == 0)
{
a5globalSkip = a5dr.ReadByte();
if (a5globalSkip == 0)
{
break;
}
if (a5globalSkip > 0x7F)
{
a5globalSkip = ((a5globalSkip & 0x7F) << 8) + a5dr.ReadByte();
a5globalSkip = (a5globalSkip << 16) + a5dr.ReadBeUInt16();
}
else
{
a5repeat = ResourceFork.GetRunLengthValue(a5dr, ref a5repeat);
//$BUG: a5repeat could return the value 0. The do-while below will
// decrement a5repeat before testing. This will lead to an effective
// repeat count of 2^32; likely not wanted.
}
}
else
{
if ((a5globalSkip & 0x80) == 0x80)
{
a5globalSkip = ((a5globalSkip & 0x7F) << 8) + a5dr.ReadByte();
}
}
a5globalSkip = a5globalSkip * 2;
do
{
a5globalOffset += a5globalSkip;
a5belowReader.Seek(a5globalOffset, SeekOrigin.Begin);
uint a5ptrOffset = a5belowReader.ReadBeUInt32();
a5belowWriter.Position = (int)a5globalOffset;
// write relocated A5World pointers to absolute address in A5World segment
// Possible register/mark as Global pointer references to strings
a5belowWriter.WriteBeUInt32((a5WorldAddress + a5ptrOffset) & 0xFFFFFFFF);
--a5repeat;
} while (a5repeat > 0);
}
}