1 files changed, 69 insertions, 0 deletions
diff --git a/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp b/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp
new file mode 100644
index 000000000000..e30123d64755
--- /dev/null
+++ b/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp
@@ -0,0 +1,69 @@
+//===-- CSKYAsmBackend.cpp - CSKY Assembler Backend -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "CSKYAsmBackend.h"
+#include "MCTargetDesc/CSKYMCTargetDesc.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCFixupKindInfo.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/Support/Debug.h"
+
+#define DEBUG_TYPE "csky-asmbackend"
+
+using namespace llvm;
+
+std::unique_ptr<MCObjectTargetWriter>
+CSKYAsmBackend::createObjectTargetWriter() const {
+  return createCSKYELFObjectWriter();
+}
+
+unsigned int CSKYAsmBackend::getNumFixupKinds() const { return 1; }
+
+void CSKYAsmBackend::applyFixup(const MCAssembler &Asm, const MCFixup &Fixup,
+                                const MCValue &Target,
+                                MutableArrayRef<char> Data, uint64_t Value,
+                                bool IsResolved,
+                                const MCSubtargetInfo *STI) const {
+  return;
+}
+
+bool CSKYAsmBackend::fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
+                                          const MCRelaxableFragment *DF,
+                                          const MCAsmLayout &Layout) const {
+  return false;
+}
+
+void CSKYAsmBackend::relaxInstruction(MCInst &Inst,
+                                      const MCSubtargetInfo &STI) const {
+  llvm_unreachable("CSKYAsmBackend::relaxInstruction() unimplemented");
+}
+
+bool CSKYAsmBackend::writeNopData(raw_ostream &OS, uint64_t Count) const {
+  if (Count % 2)
+    return false;
+
+  // MOV32 r0, r0
+  while (Count >= 4) {
+    OS.write("\xc4\x00\x48\x20", 4);
+    Count -= 4;
+  }
+  // MOV16 r0, r0
+  if (Count)
+    OS.write("\x6c\x03", 2);
+
+  return true;
+}
+
+MCAsmBackend *llvm::createCSKYAsmBackend(const Target &T,
+                                         const MCSubtargetInfo &STI,
+                                         const MCRegisterInfo &MRI,
+                                         const MCTargetOptions &Options) {
+  return new CSKYAsmBackend(STI, Options);
+}