Add MipsELFWriterInfo.{h,cpp}.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162136 91177308-0d34-0410-b5e6-96231b3b80d8

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");
+}