Add MipsELFWriterInfo.{h,cpp}.

llvm-svn: 162136

llvm/lib/Target/Mips/MipsELFWriterInfo.cpp

@@ -0,0 +1,92 @@
+//===-- MipsELFWriterInfo.cpp - ELF Writer Info for the Mips backend --------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements ELF writer information for the Mips backend.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MipsELFWriterInfo.h"
+#include "MipsRelocations.h"
+#include "llvm/Function.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/ELF.h"
+
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+//  Implementation of the MipsELFWriterInfo class
+//===----------------------------------------------------------------------===//
+
+MipsELFWriterInfo::MipsELFWriterInfo(bool is64Bit_, bool isLittleEndian_)
+  : TargetELFWriterInfo(is64Bit_, isLittleEndian_) {
+    EMachine = EM_MIPS;
+  }
+
+MipsELFWriterInfo::~MipsELFWriterInfo() {}
+
+unsigned MipsELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
+    switch(MachineRelTy) {
+    case Mips::reloc_mips_pc16:
+      return ELF::R_MIPS_GOT16;
+    case Mips::reloc_mips_hi:
+      return ELF::R_MIPS_HI16;
+    case Mips::reloc_mips_lo:
+      return ELF::R_MIPS_LO16;
+    case Mips::reloc_mips_26:
+      return ELF::R_MIPS_26;
+    default:
+      llvm_unreachable("unknown Mips machine relocation type");
+    }
+}
+
+long int MipsELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy,
+                                                    long int Modifier) const {
+    switch(RelTy) {
+    case ELF::R_MIPS_26: return Modifier;
+    default:
+      llvm_unreachable("unknown Mips relocation type");
+    }
+}
+
+unsigned MipsELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
+    switch(RelTy) {
+    case ELF::R_MIPS_GOT16:
+    case ELF::R_MIPS_26:
+        return 32;
+    default:
+      llvm_unreachable("unknown Mips relocation type");
+    }
+}
+
+bool MipsELFWriterInfo::isPCRelativeRel(unsigned RelTy) const {
+    switch(RelTy) {
+    case ELF::R_MIPS_GOT16:
+        return true;
+    case ELF::R_MIPS_26:
+        return false;
+    default:
+      llvm_unreachable("unknown Mips relocation type");
+    }
+}
+
+unsigned MipsELFWriterInfo::getAbsoluteLabelMachineRelTy() const {
+  return Mips::reloc_mips_26;
+}
+
+long int MipsELFWriterInfo::computeRelocation(unsigned SymOffset,
+                                             unsigned RelOffset,
+                                             unsigned RelTy) const {
+
+  if (RelTy == ELF::R_MIPS_GOT16)
+    return SymOffset - (RelOffset + 4);
+
+  llvm_unreachable("computeRelocation unknown for this relocation type");
+}

llvm/lib/Target/Mips/MipsELFWriterInfo.h

@@ -0,0 +1,59 @@
+//===-- MipsELFWriterInfo.h - ELF Writer Info for Mips ------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements ELF writer information for the Mips backend.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MIPS_ELF_WRITER_INFO_H
+#define MIPS_ELF_WRITER_INFO_H
+
+#include "llvm/Target/TargetELFWriterInfo.h"
+
+namespace llvm {
+
+  class MipsELFWriterInfo : public TargetELFWriterInfo {
+
+  public:
+    MipsELFWriterInfo(bool is64Bit_, bool isLittleEndian_);
+    virtual ~MipsELFWriterInfo();
+
+    /// getRelocationType - Returns the target specific ELF Relocation type.
+    /// 'MachineRelTy' contains the object code independent relocation type
+    virtual unsigned getRelocationType(unsigned MachineRelTy) const;
+
+    /// hasRelocationAddend - True if the target uses an addend in the
+    /// ELF relocation entry.
+    virtual bool hasRelocationAddend() const { return is64Bit ? true : false; }
+
+    /// getDefaultAddendForRelTy - Gets the default addend value for a
+    /// relocation entry based on the target ELF relocation type.
+    virtual long int getDefaultAddendForRelTy(unsigned RelTy,
+                                              long int Modifier = 0) const;
+
+    /// getRelTySize - Returns the size of relocatable field in bits
+    virtual unsigned getRelocationTySize(unsigned RelTy) const;
+
+    /// isPCRelativeRel - True if the relocation type is pc relative
+    virtual bool isPCRelativeRel(unsigned RelTy) const;
+
+    /// getJumpTableRelocationTy - Returns the machine relocation type used
+    /// to reference a jumptable.
+    virtual unsigned getAbsoluteLabelMachineRelTy() const;
+
+    /// computeRelocation - Some relocatable fields could be relocated
+    /// directly, avoiding the relocation symbol emission, compute the
+    /// final relocation value for this symbol.
+    virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
+                                       unsigned RelTy) const;
+  };
+
+} // end llvm namespace
+
+#endif // MIPS_ELF_WRITER_INFO_H