Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp

@@ -0,0 +1,92 @@
+//===- AMDGPUELFObjectWriter.cpp - AMDGPU ELF Writer ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPUMCTargetDesc.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+namespace {
+
+class AMDGPUELFObjectWriter : public MCELFObjectTargetWriter {
+public:
+  AMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI, bool HasRelocationAddend);
+
+protected:
+  unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
+                        const MCFixup &Fixup, bool IsPCRel) const override;
+};
+
+
+} // end anonymous namespace
+
+AMDGPUELFObjectWriter::AMDGPUELFObjectWriter(bool Is64Bit,
+                                             uint8_t OSABI,
+                                             bool HasRelocationAddend)
+  : MCELFObjectTargetWriter(Is64Bit, OSABI, ELF::EM_AMDGPU,
+                            HasRelocationAddend) {}
+
+unsigned AMDGPUELFObjectWriter::getRelocType(MCContext &Ctx,
+                                             const MCValue &Target,
+                                             const MCFixup &Fixup,
+                                             bool IsPCRel) const {
+  if (const auto *SymA = Target.getSymA()) {
+    // SCRATCH_RSRC_DWORD[01] is a special global variable that represents
+    // the scratch buffer.
+    if (SymA->getSymbol().getName() == "SCRATCH_RSRC_DWORD0")
+      return ELF::R_AMDGPU_ABS32_LO;
+
+    if (SymA->getSymbol().getName() == "SCRATCH_RSRC_DWORD1")
+      return ELF::R_AMDGPU_ABS32_HI;
+  }
+
+  switch (Target.getAccessVariant()) {
+  default:
+    break;
+  case MCSymbolRefExpr::VK_GOTPCREL:
+    return ELF::R_AMDGPU_GOTPCREL;
+  case MCSymbolRefExpr::VK_AMDGPU_GOTPCREL32_LO:
+    return ELF::R_AMDGPU_GOTPCREL32_LO;
+  case MCSymbolRefExpr::VK_AMDGPU_GOTPCREL32_HI:
+    return ELF::R_AMDGPU_GOTPCREL32_HI;
+  case MCSymbolRefExpr::VK_AMDGPU_REL32_LO:
+    return ELF::R_AMDGPU_REL32_LO;
+  case MCSymbolRefExpr::VK_AMDGPU_REL32_HI:
+    return ELF::R_AMDGPU_REL32_HI;
+  }
+
+  switch (Fixup.getKind()) {
+  default: break;
+  case FK_PCRel_4:
+    return ELF::R_AMDGPU_REL32;
+  case FK_Data_4:
+  case FK_SecRel_4:
+    return ELF::R_AMDGPU_ABS32;
+  case FK_Data_8:
+    return ELF::R_AMDGPU_ABS64;
+  }
+
+  llvm_unreachable("unhandled relocation type");
+}
+
+std::unique_ptr<MCObjectWriter>
+llvm::createAMDGPUELFObjectWriter(bool Is64Bit, uint8_t OSABI,
+                                  bool HasRelocationAddend,
+                                  raw_pwrite_stream &OS) {
+  auto MOTW = llvm::make_unique<AMDGPUELFObjectWriter>(Is64Bit, OSABI,
+                                                       HasRelocationAddend);
+  return createELFObjectWriter(std::move(MOTW), OS, true);
+}