Move the Mips only bits of the ELF writer to lib/Target/Mips.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147133 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 145 insertions, 21 deletions

diff --git a/lib/Target/Mips/MCTargetDesc/CMakeLists.txt b/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
index 0eb0a55..fa23150 100644
--- a/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
+++ b/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
@@ -3,6 +3,7 @@ add_llvm_library(LLVMMipsDesc
   MipsMCAsmInfo.cpp
   MipsMCCodeEmitter.cpp
   MipsMCTargetDesc.cpp
+  MipsELFObjectWriter.cpp
   )
 
 add_dependencies(LLVMMipsDesc MipsCommonTableGen)
diff --git a/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
index 0f57d3c..bd9b641 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -69,15 +69,6 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
 }
 
 namespace {
-
-class MipsELFObjectWriter : public MCELFObjectTargetWriter {
-public:
-  MipsELFObjectWriter(bool is64Bit, uint8_t OSABI, uint16_t EMachine,
-                      bool HasRelocationAddend)
-    : MCELFObjectTargetWriter(is64Bit, OSABI, EMachine,
-                              HasRelocationAddend) {}
-};
-
 class MipsAsmBackend : public MCAsmBackend {
 public:
   MipsAsmBackend(const Target &T) : MCAsmBackend() {}
@@ -206,12 +197,7 @@ public:
     : MipsAsmBackend(T), OSABI(_OSABI) {}
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
-    return createELFObjectWriter(createELFObjectTargetWriter(),
-                                 OS, /*IsLittleEndian*/ false);
-  }
-
-  MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
-    return new MipsELFObjectWriter(false, OSABI, ELF::EM_MIPS, false);
+    return createMipsELFObjectWriter(OS, /*IsLittleEndian*/ false, OSABI);
   }
 };
 
@@ -223,12 +209,7 @@ public:
     : MipsAsmBackend(T), OSABI(_OSABI) {}
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
-    return createELFObjectWriter(createELFObjectTargetWriter(),
-                                 OS, /*IsLittleEndian*/ true);
-  }
-
-  MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
-    return new MipsELFObjectWriter(false, OSABI, ELF::EM_MIPS, false);
+    return createMipsELFObjectWriter(OS, /*IsLittleEndian*/ true, OSABI);
   }
 };
 } // namespace
diff --git a/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
new file mode 100644
index 0000000..9c2f81e
--- /dev/null
+++ b/lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp
@@ -0,0 +1,137 @@
+//===-- MipsELFObjectWriter.cpp - Mips ELF Writer ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MCTargetDesc/MipsFixupKinds.h"
+#include "MCTargetDesc/MipsMCTargetDesc.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/ErrorHandling.h"
+
+using namespace llvm;
+
+namespace {
+  class MipsELFObjectWriter : public MCELFObjectTargetWriter {
+  public:
+    MipsELFObjectWriter(uint8_t OSABI);
+
+    virtual ~MipsELFObjectWriter();
+
+    virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+                                  bool IsPCRel, bool IsRelocWithSymbol,
+                                  int64_t Addend) const;
+    virtual unsigned getEFlags() const;
+    virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
+                                           const MCValue &Target,
+                                           const MCFragment &F,
+                                           const MCFixup &Fixup,
+                                           bool IsPCRel) const;
+  };
+}
+
+MipsELFObjectWriter::MipsELFObjectWriter(uint8_t OSABI)
+  : MCELFObjectTargetWriter(/*Is64Bit*/ false, OSABI, ELF::EM_MIPS,
+                            /*HasRelocationAddend*/ false) {}
+
+MipsELFObjectWriter::~MipsELFObjectWriter() {}
+
+// FIXME: get the real EABI Version from the Triple.
+unsigned MipsELFObjectWriter::getEFlags() const {
+  return ELF::EF_MIPS_NOREORDER | ELF::EF_MIPS_ARCH_32R2;
+}
+
+const MCSymbol *MipsELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
+                                                    const MCValue &Target,
+                                                    const MCFragment &F,
+                                                    const MCFixup &Fixup,
+                                                    bool IsPCRel) const {
+  assert(Target.getSymA() && "SymA cannot be 0.");
+  const MCSymbol &Sym = Target.getSymA()->getSymbol();
+
+  if (Sym.getSection().getKind().isMergeableCString() ||
+      Sym.getSection().getKind().isMergeableConst())
+    return &Sym;
+
+  return NULL;
+}
+
+unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
+                                           const MCFixup &Fixup,
+                                           bool IsPCRel,
+                                           bool IsRelocWithSymbol,
+                                           int64_t Addend) const {
+  // determine the type of the relocation
+  unsigned Type = (unsigned)ELF::R_MIPS_NONE;
+  unsigned Kind = (unsigned)Fixup.getKind();
+
+  switch (Kind) {
+  default:
+    llvm_unreachable("invalid fixup kind!");
+  case FK_Data_4:
+    Type = ELF::R_MIPS_32;
+    break;
+  case FK_GPRel_4:
+    Type = ELF::R_MIPS_GPREL32;
+    break;
+  case Mips::fixup_Mips_GPREL16:
+    Type = ELF::R_MIPS_GPREL16;
+    break;
+  case Mips::fixup_Mips_26:
+    Type = ELF::R_MIPS_26;
+    break;
+  case Mips::fixup_Mips_CALL16:
+    Type = ELF::R_MIPS_CALL16;
+    break;
+  case Mips::fixup_Mips_GOT_Global:
+  case Mips::fixup_Mips_GOT_Local:
+    Type = ELF::R_MIPS_GOT16;
+    break;
+  case Mips::fixup_Mips_HI16:
+    Type = ELF::R_MIPS_HI16;
+    break;
+  case Mips::fixup_Mips_LO16:
+    Type = ELF::R_MIPS_LO16;
+    break;
+  case Mips::fixup_Mips_TLSGD:
+    Type = ELF::R_MIPS_TLS_GD;
+    break;
+  case Mips::fixup_Mips_GOTTPREL:
+    Type = ELF::R_MIPS_TLS_GOTTPREL;
+    break;
+  case Mips::fixup_Mips_TPREL_HI:
+    Type = ELF::R_MIPS_TLS_TPREL_HI16;
+    break;
+  case Mips::fixup_Mips_TPREL_LO:
+    Type = ELF::R_MIPS_TLS_TPREL_LO16;
+    break;
+  case Mips::fixup_Mips_TLSLDM:
+    Type = ELF::R_MIPS_TLS_LDM;
+    break;
+  case Mips::fixup_Mips_DTPREL_HI:
+    Type = ELF::R_MIPS_TLS_DTPREL_HI16;
+    break;
+  case Mips::fixup_Mips_DTPREL_LO:
+    Type = ELF::R_MIPS_TLS_DTPREL_LO16;
+    break;
+  case Mips::fixup_Mips_Branch_PCRel:
+  case Mips::fixup_Mips_PC16:
+    Type = ELF::R_MIPS_PC16;
+    break;
+  }
+
+  return Type;
+}
+
+MCObjectWriter *llvm::createMipsELFObjectWriter(raw_ostream &OS,
+                                               bool IsLittleEndian,
+                                               uint8_t OSABI) {
+  MCELFObjectTargetWriter *MOTW = new MipsELFObjectWriter(OSABI);
+  return createELFObjectWriter(MOTW, OS, IsLittleEndian);
+}
diff --git a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
index fc43d2d..de82347 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
+++ b/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.h
@@ -14,6 +14,8 @@
 #ifndef MIPSMCTARGETDESC_H
 #define MIPSMCTARGETDESC_H
 
+#include "llvm/Support/DataTypes.h"
+
 namespace llvm {
 class MCAsmBackend;
 class MCCodeEmitter;
@@ -36,6 +38,9 @@ MCCodeEmitter *createMipsMCCodeEmitter(const MCInstrInfo &MCII,
 
 MCAsmBackend *createMipsAsmBackend(const Target &T, StringRef TT);
 
+MCObjectWriter *createMipsELFObjectWriter(raw_ostream &OS,
+                                          bool IsLittleEndian,
+                                          uint8_t OSABI);
 } // End llvm namespace
 
 // Defines symbolic names for Mips registers.  This defines a mapping from