public unsafe override bool AssembleJitStub(MethodSpec ms, Target t, IBinaryFile bf, TysilaState s)
{
var tsect = bf.GetTextSection();
var mname = ms.MangleMethod();
// Align to 16 byte boundary
while ((tsect.Data.Count & 0xf) != 0)
{
tsect.Data.Add(0);
}
// First comes a pointer to the MethodSpec for this type, followed by a state flag (starts at 0)
var ms_ptr = libsupcs.CastOperations.ReinterpretAsUlong(ms);
var ms_ptr_b = BitConverter.GetBytes(ms_ptr);
foreach (var bi in ms_ptr_b)
{
tsect.Data.Add(bi);
}
for (int i = 0; i < 8; i++)
{
tsect.Data.Add(0);
}
// Add symbol
var sym = bf.CreateSymbol();
sym.Name = mname;
sym.ObjectType = SymbolObjectType.Function;
sym.Offset = (ulong)tsect.Data.Count;
sym.Type = SymbolType.Weak;
tsect.AddSymbol(sym);
// The code here comes from libtysila5/target/x86/x86_64-jitstub.asm
var b = new byte[]
{
0x83, 0x3d, 0xf1, 0xff, 0xff, 0xff, 0x02,
0x74, 0x58,
0x57,
0x48, 0xc7, 0xc7, 0x01, 0x00, 0x00, 0x00,
0x31, 0xc0,
0xf0, 0x0f, 0xb1, 0x3d, 0xdd, 0xff, 0xff,
0xff,
0x83, 0xf8, 0x01,
0x7c, 0x06,
0x7f, 0x3e,
0xf3, 0x90,
0xeb, 0xeb,
0x56,
0x52,
0x51,
0x41, 0x50,
0x41, 0x51,
0x41, 0x52,
0x41, 0x53,
0x48, 0x8b, 0x3d, 0xb8, 0xff, 0xff, 0xff,
0x48, 0xb8
};
foreach (var bi in b)
{
tsect.Data.Add(bi);
}
// Next comes the 64-bit address of jit_tm
var jit_tm_addr = libsupcs.CastOperations.ReinterpretAs <ulong>(libsupcs.OtherOperations.GetFunctionAddress("jit_tm"));
var jit_tm_addr_b = BitConverter.GetBytes(jit_tm_addr);
foreach (var bi in jit_tm_addr_b)
{
tsect.Data.Add(bi);
}
// Continue with the rest of the function
b = new byte[]
{
0xff, 0xd0,
0x41, 0x5b,
0x41, 0x5a,
0x41, 0x59,
0x41, 0x58,
0x59,
0x5a,
0x5e,
0x48, 0x89, 0x05, 0x9a, 0xff, 0xff, 0xff,
0xc7, 0x05, 0x98, 0xff, 0xff, 0xff, 0x02, 0x00, 0x00, 0x00,
0x5f,
0xff, 0x25, 0x89, 0xff, 0xff, 0xff
};
foreach (var bi in b)
{
tsect.Data.Add(bi);
}
return(true);
}
