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diff --git a/lib/Target/BPF/BPFCallingConv.td b/lib/Target/BPF/BPFCallingConv.td
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+++ b/lib/Target/BPF/BPFCallingConv.td
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+//===-- BPFCallingConv.td - Calling Conventions BPF --------*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This describes the calling conventions for the BPF architecture.
+//
+//===----------------------------------------------------------------------===//
+
+// BPF 64-bit C return-value convention.
+def RetCC_BPF64 : CallingConv<[CCIfType<[i64], CCAssignToReg<[R0]>>]>;
+
+// BPF 64-bit C Calling convention.
+def CC_BPF64 : CallingConv<[
+  // Promote i8/i16/i32 args to i64
+  CCIfType<[ i8, i16, i32 ], CCPromoteToType<i64>>,
+
+  // All arguments get passed in integer registers if there is space.
+  CCIfType<[i64], CCAssignToReg<[ R1, R2, R3, R4, R5 ]>>,
+
+  // Could be assigned to the stack in 8-byte aligned units, but unsupported
+  CCAssignToStack<8, 8>
+]>;
+
+def CSR : CalleeSavedRegs<(add R6, R7, R8, R9, R10)>;