private static void EmitNativeCallWithGuestAddress(ArmEmitterContext context, Operand funcAddr, Operand guestAddress, bool isJump)
{
Operand nativeContextPtr = context.LoadArgument(OperandType.I64, 0);
context.Store(context.Add(nativeContextPtr, Const((long)NativeContext.GetCallAddressOffset())), guestAddress);
EmitNativeCall(context, nativeContextPtr, funcAddr, isJump);
}
/// <summary>
/// Generates a stub that is used to find function addresses. Used for direct calls when their jump table does not have the host address yet.
/// Takes a NativeContext like a translated guest function, and extracts the target address from the NativeContext.
/// When the target function is compiled in highCq, all table entries are updated to point to that function instead of this stub by the translator.
/// </summary>
private static GuestFunction GenerateDirectCallStub(bool tailCall)
{
EmitterContext context = new EmitterContext();
Operand nativeContextPtr = context.LoadArgument(OperandType.I64, 0);
Operand address = context.Load(OperandType.I64, context.Add(nativeContextPtr, Const((long)NativeContext.GetCallAddressOffset())));
Operand functionAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetFunctionAddress)), address);
EmitCall(context, functionAddr, tailCall);
ControlFlowGraph cfg = context.GetControlFlowGraph();
OperandType[] argTypes = new OperandType[] { OperandType.I64 };
return(Compiler.Compile <GuestFunction>(cfg, argTypes, OperandType.I64, CompilerOptions.HighCq));
}
/// <summary>
/// Generates a stub that is used to find function addresses and add them to an indirect table.
/// Used for indirect calls entries (already claimed) when their jump table does not have the host address yet.
/// Takes a NativeContext like a translated guest function, and extracts the target indirect table entry from the NativeContext.
/// If the function we find is highCq, the entry in the table is updated to point to that function rather than this stub.
/// </summary>
private static GuestFunction GenerateIndirectCallStub(bool tailCall)
{
EmitterContext context = new EmitterContext();
Operand nativeContextPtr = context.LoadArgument(OperandType.I64, 0);
Operand entryAddress = context.Load(OperandType.I64, context.Add(nativeContextPtr, Const((long)NativeContext.GetCallAddressOffset())));
Operand address = context.Load(OperandType.I64, entryAddress);
// We need to find the missing function. If the function is HighCq, then it replaces this stub in the indirect table.
// Either way, we call it afterwards.
Operand functionAddr = context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.GetIndirectFunctionAddress)), address, entryAddress);
// Call and save the function.
EmitCall(context, functionAddr, tailCall);
ControlFlowGraph cfg = context.GetControlFlowGraph();
OperandType[] argTypes = new OperandType[] { OperandType.I64 };
return(Compiler.Compile <GuestFunction>(cfg, argTypes, OperandType.I64, CompilerOptions.HighCq));
}