public override Address ReadStub(Address addrStub, MemoryArea mem)
{
var offsetInSection = (uint)(addrStub - mem.BaseAddress);
var opcode = mem.ReadBeUInt16(offsetInSection);
// Expect move.l offset(pc),a0
if (opcode != 0x207B)
{
return(null);
}
var offsetToGotEntry = mem.ReadBeInt32(offsetInSection + 4);
var addrGotEntry = addrStub + 2 + offsetToGotEntry;
return(addrGotEntry);
}
public void AddResourcesToImageMap(
Address addrLoad,
MemoryArea mem,
SegmentMap segmentMap,
List <ImageSymbol> entryPoints,
SortedList <Address, ImageSymbol> symbols)
{
JumpTable jt = null;
var codeSegs = new Dictionary <int, ImageSegment>();
foreach (ResourceType type in ResourceTypes)
{
foreach (ResourceReference rsrc in type.References)
{
uint uSegOffset = rsrc.DataOffset + rsrcDataOff;
int segmentSize = mem.ReadBeInt32(uSegOffset);
// Skip the size longword at the beginning of the segment, and an extra 4
// if it is a code segement other than CODE#0.
int bytesToSkip = 4;
if (type.Name == "CODE" && rsrc.ResourceID != 0)
{
bytesToSkip += 4;
}
var abSegment = new byte[segmentSize];
Array.Copy(mem.Bytes, uSegOffset + bytesToSkip, abSegment, 0, segmentSize);
Address addrSegment = addrLoad + uSegOffset + bytesToSkip; //$TODO pad to 16-byte boundary?
var memSeg = new MemoryArea(addrSegment, abSegment);
var segment = segmentMap.AddSegment(new ImageSegment(
ResourceDescriptiveName(type, rsrc),
memSeg,
AccessMode.Read));
if (type.Name == "CODE")
{
if (rsrc.ResourceID == 0)
{
jt = ProcessJumpTable(memSeg, symbols);
}
else
{
codeSegs.Add(rsrc.ResourceID, segment);
var macsBug = new MacsBugSymbolScanner(arch, segment.MemoryArea);
var mbSymbols = macsBug.ScanForSymbols();
foreach (var symbol in mbSymbols)
{
symbols[symbol.Address] = symbol;
}
}
}
}
}
// We have found a jump table, so we allocate an A5World.
if (jt != null)
{
// Find an address beyond all known segments.
var addr = segmentMap.Segments.Values.Max(s => s.Address + s.Size).Align(0x10);
var a5world = LoadA5World(jt, addr, codeSegs, symbols);
platform.A5World = a5world;
platform.A5Offset = jt.BelowA5Size;
segmentMap.AddSegment(a5world);
// Find first (and only!) segment containing the name %A5Init.
var a5dataSegment = segmentMap.Segments.Values.SingleOrDefault(SegmentNamedA5Init);
if (a5dataSegment == null)
{
return;
}
// Get an image reader to the start of the data.
var a5dr = GetA5InitImageReader(a5dataSegment);
if (a5dr == null)
{
return;
}
var a5dbelow = a5dr.ReadBeUInt32();
var a5dbankSize = a5dr.ReadBeUInt32();
var a5doffset = a5dr.ReadBeUInt32();
var a5dreloc = a5dr.ReadBeUInt32();
var a5dhdrend = a5dr.ReadBeUInt32();
if (a5dbankSize != 0x00010000)
{
// bank size not supported for compressed global data
return;
}
A5Expand(a5dr, a5dbelow);
}
}