[AVR] Add the ELF object file writer

[dylanmckay]

Summary

This adds the ELF32 writer for AVR.

llvm/trunk/lib/Target/AVR/MCTargetDesc/AVRELFObjectWriter.cpp

+//===-- AVRELFObjectWriter.cpp - AVR 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/AVRFixupKinds.h"
+#include "MCTargetDesc/AVRMCTargetDesc.h"
+
+#include "llvm/MC/MCAssembler.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"
+
+namespace llvm {
+
+/// Writes AVR machine code into an ELF32 object file.
+class AVRELFObjectWriter : public MCELFObjectTargetWriter {
+public:
+  AVRELFObjectWriter(uint8_t OSABI);
+
+  virtual ~AVRELFObjectWriter() {}
+
+  unsigned getRelocType(MCContext &Ctx,
+                        const MCValue &Target,
+                        const MCFixup &Fixup,
+                        bool IsPCRel) const override;
+};
+
+AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
+    : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true, false) {}
+
+unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx,
+                                          const MCValue &Target,
+                                          const MCFixup &Fixup,
+                                          bool IsPCRel) const {
+  switch ((unsigned) Fixup.getKind()) {
+  case FK_Data_1:
+  case FK_Data_4:
+    llvm_unreachable("unsupported relocation type");
+  case FK_Data_2:
+    return ELF::R_AVR_16_PM;
+  case AVR::fixup_32:
+    return ELF::R_AVR_32;
+  case AVR::fixup_7_pcrel:
+    return ELF::R_AVR_7_PCREL;
+  case AVR::fixup_13_pcrel:
+    return ELF::R_AVR_13_PCREL;
+  case AVR::fixup_16:
+    return ELF::R_AVR_16;
+  case AVR::fixup_16_pm:
+    return ELF::R_AVR_16_PM;
+  case AVR::fixup_lo8_ldi:
+    return ELF::R_AVR_LO8_LDI;
+  case AVR::fixup_hi8_ldi:
+    return ELF::R_AVR_HI8_LDI;
+  case AVR::fixup_hh8_ldi:
+    return ELF::R_AVR_HH8_LDI;
+  case AVR::fixup_lo8_ldi_neg:
+    return ELF::R_AVR_LO8_LDI_NEG;
+  case AVR::fixup_hi8_ldi_neg:
+    return ELF::R_AVR_HI8_LDI_NEG;
+  case AVR::fixup_hh8_ldi_neg:
+    return ELF::R_AVR_HH8_LDI_NEG;
+  case AVR::fixup_lo8_ldi_pm:
+    return ELF::R_AVR_LO8_LDI_PM;
+  case AVR::fixup_hi8_ldi_pm:
+    return ELF::R_AVR_HI8_LDI_PM;
+  case AVR::fixup_hh8_ldi_pm:
+    return ELF::R_AVR_HH8_LDI_PM;
+  case AVR::fixup_lo8_ldi_pm_neg:
+    return ELF::R_AVR_LO8_LDI_PM_NEG;
+  case AVR::fixup_hi8_ldi_pm_neg:
+    return ELF::R_AVR_HI8_LDI_PM_NEG;
+  case AVR::fixup_hh8_ldi_pm_neg:
+    return ELF::R_AVR_HH8_LDI_PM_NEG;
+  case AVR::fixup_call:
+    return ELF::R_AVR_CALL;
+  case AVR::fixup_ldi:
+    return ELF::R_AVR_LDI;
+  case AVR::fixup_6:
+    return ELF::R_AVR_6;
+  case AVR::fixup_6_adiw:
+    return ELF::R_AVR_6_ADIW;
+  case AVR::fixup_ms8_ldi:
+    return ELF::R_AVR_MS8_LDI;
+  case AVR::fixup_ms8_ldi_neg:
+    return ELF::R_AVR_MS8_LDI_NEG;
+  case AVR::fixup_lo8_ldi_gs:
+    return ELF::R_AVR_LO8_LDI_GS;
+  case AVR::fixup_hi8_ldi_gs:
+    return ELF::R_AVR_HI8_LDI_GS;
+  case AVR::fixup_8:
+    return ELF::R_AVR_8;
+  case AVR::fixup_8_lo8:
+    return ELF::R_AVR_8_LO8;
+  case AVR::fixup_8_hi8:
+    return ELF::R_AVR_8_HI8;
+  case AVR::fixup_8_hlo8:
+    return ELF::R_AVR_8_HLO8;
+  case AVR::fixup_sym_diff:
+    return ELF::R_AVR_SYM_DIFF;
+  case AVR::fixup_16_ldst:
+    return ELF::R_AVR_16_LDST;
+  case AVR::fixup_lds_sts_16:
+    return ELF::R_AVR_LDS_STS_16;
+  case AVR::fixup_port6:
+    return ELF::R_AVR_PORT6;
+  case AVR::fixup_port5:
+    return ELF::R_AVR_PORT5;
+  default:
+    llvm_unreachable("invalid fixup kind!");
+  }
+}
+
+MCObjectWriter *createAVRELFObjectWriter(raw_pwrite_stream &OS, uint8_t OSABI) {
+  MCELFObjectTargetWriter *MOTW = new AVRELFObjectWriter(OSABI);
+  return createELFObjectWriter(MOTW, OS, true);
+}
+
+} // end of namespace llvm
+

llvm/trunk/lib/Target/AVR/MCTargetDesc/CMakeLists.txt

 add_llvm_library(LLVMAVRDesc
+  AVRELFObjectWriter.cpp
   AVRELFStreamer.cpp
   AVRMCAsmInfo.cpp
   AVRMCExpr.cpp
   AVRMCTargetDesc.cpp
   AVRTargetStreamer.cpp
 )
 
 add_dependencies(LLVMAVRDesc AVRCommonTableGen)