public static void ApplyExpansionPatch(byte[] targetRom)
{
// Apply expansion code prior to expansion
// (for ease... atm expansion code targets the fixed bank at $F instead of $1F)
// manually include defines
string asm = Projects.ProjectResources.DefaultDefinesFile + Environment.NewLine + Mmc3Resources.ExpansionASM;
asm = NopOutScreenLoad(asm);
snarfblasm.Assembler assm = new snarfblasm.Assembler("mmc3Expander", asm, null);
var output = assm.Assemble();
var errors = assm.GetErrors();
if (errors != null && errors.Count > 0)
{
// todo: more specific exception
string error = "Assembler error: " + errors[0].File + " line " + errors[0].LineNumber + ": " + errors[0].Message;
if (errors.Count > 1)
{
error += " (additional errors: " + (errors.Count - 1).ToString() + ")";
}
throw new Exception(error);
}
var patches = assm.GetPatchSegments();
for (int i = 0; i < patches.Count; i++)
{
var patch = patches[i];
int patchLength = patch.Length;
if (patchLength < 0)
{
patchLength = output.Length - patch.Start;
}
Array.Copy(output, patch.Start, targetRom, patch.PatchOffset, patchLength);
}
}
private void Assemble()
{
ClearScreenExtraBytes();
// Assemble (first pass (1)) to calculate size of each screen's code
{
string buildFile = ConstructBuildFile(1);
var buildFileAsBin = System.Text.Encoding.UTF8.GetBytes(buildFile);
snarfblasm.Assembler assembler = new snarfblasm.Assembler("Main File", new MemoryStream(buildFileAsBin), new FileProvider(this));
assembler.AllowInvalidOpcodes = false;
assembler.OverflowChecking = snarfblasm.OverflowChecking.None;
assembler.RequireColonOnLabels = true;
assembler.RequireDotOnDirectives = true;
var assembledBytes = assembler.Assemble();
ProcessAssembleErrors(assembler.GetErrors(), 1);
if (FatalError)
{
return;
}
// Added first-pass-code to screens
var patchSegments = assembler.GetPatchSegments();
ApplyPatches(assembledBytes, patchSegments, false);
if (FatalError)
{
return;
}
// Serializing data causes ROM data layout to be updated, which is then used to set the base address for each screen's code
CheckForOverrun();
if (FatalError)
{
return;
}
outputRom.SerializeAllData();
ApplyScreenCodeBases();
}
// Assemble (second pass) with correct base addresses
{
string buildFile = ConstructBuildFile(0); // Reconstruct with correct base addresses
byte[] buildFileAsBin = System.Text.Encoding.UTF8.GetBytes(buildFile);
var assembler = new snarfblasm.Assembler("Main File", new MemoryStream(buildFileAsBin), new FileProvider(this));
assembler.Labels = new snarfblasm.AddressLabels();
assembler.AllowInvalidOpcodes = false;
assembler.OverflowChecking = snarfblasm.OverflowChecking.Unsigned;
assembler.RequireColonOnLabels = true;
assembler.RequireDotOnDirectives = true;
var assembledBytes = assembler.Assemble();
ProcessAssembleErrors(assembler.GetErrors(), 0);
if (FatalError)
{
return;
}
if (project.GenerateDebugFiles && !string.IsNullOrEmpty(project.DebugOutputDirectory.Trim()))
{
BuildDebugFiles(assembler.Labels);
}
// Re-apply updated patch
var patchSegments = assembler.GetPatchSegments();
ApplyPatches(assembledBytes, patchSegments, true);
if (FatalError)
{
return;
}
// This causes updated asm bytes to be written to ROM
outputRom.SerializeAllData();
CheckForOverrun();
if (FatalError)
{
return;
}
}
}