1 //===-- MBlazeAsmBackend.cpp - MBlaze Assembler Backend -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/Target/TargetAsmBackend.h"
12 #include "MBlazeELFWriterInfo.h"
13 #include "llvm/ADT/Twine.h"
14 #include "llvm/MC/MCAssembler.h"
15 #include "llvm/MC/MCAsmLayout.h"
16 #include "llvm/MC/MCELFSymbolFlags.h"
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCObjectFormat.h"
19 #include "llvm/MC/MCObjectWriter.h"
20 #include "llvm/MC/MCSectionELF.h"
21 #include "llvm/MC/MCSectionMachO.h"
22 #include "llvm/MC/MCValue.h"
23 #include "llvm/Support/ELF.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include "llvm/Target/TargetRegistry.h"
27 #include "llvm/Target/TargetAsmBackend.h"
30 static unsigned getFixupKindSize(unsigned Kind) {
32 default: assert(0 && "invalid fixup kind!");
33 case FK_Data_1: return 1;
35 case FK_Data_2: return 2;
37 case FK_Data_4: return 4;
38 case FK_Data_8: return 8;
44 class MBlazeAsmBackend : public TargetAsmBackend {
46 MBlazeAsmBackend(const Target &T)
47 : TargetAsmBackend() {
50 unsigned getNumFixupKinds() const {
54 bool MayNeedRelaxation(const MCInst &Inst) const;
56 void RelaxInstruction(const MCInst &Inst, MCInst &Res) const;
58 bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const;
60 unsigned getPointerSize() const {
65 static unsigned getRelaxedOpcode(unsigned Op) {
68 case MBlaze::ADDIK: return MBlaze::ADDIK32;
69 case MBlaze::ORI: return MBlaze::ORI32;
70 case MBlaze::BRLID: return MBlaze::BRLID32;
74 bool MBlazeAsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
75 if (getRelaxedOpcode(Inst.getOpcode()) == Inst.getOpcode())
78 bool hasExprOrImm = false;
79 for (unsigned i = 0; i < Inst.getNumOperands(); ++i)
80 hasExprOrImm |= Inst.getOperand(i).isExpr();
85 void MBlazeAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
87 Res.setOpcode(getRelaxedOpcode(Inst.getOpcode()));
90 bool MBlazeAsmBackend::WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
94 for (uint64_t i = 0; i < Count; i += 4)
95 OW->Write32(0x00000000);
99 } // end anonymous namespace
102 class ELFMBlazeAsmBackend : public MBlazeAsmBackend {
103 MCELFObjectFormat Format;
106 Triple::OSType OSType;
107 ELFMBlazeAsmBackend(const Target &T, Triple::OSType _OSType)
108 : MBlazeAsmBackend(T), OSType(_OSType) { }
110 virtual const MCObjectFormat &getObjectFormat() const {
115 void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
116 uint64_t Value) const;
118 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
119 return createELFObjectWriter(OS,/*Is64Bit=*/false,
120 OSType, ELF::EM_MBLAZE,
121 /*IsLittleEndian=*/false,
122 /*HasRelocationAddend=*/true);
126 void ELFMBlazeAsmBackend::ApplyFixup(const MCFixup &Fixup, char *Data,
127 unsigned DataSize, uint64_t Value) const {
128 unsigned Size = getFixupKindSize(Fixup.getKind());
130 assert(Fixup.getOffset() + Size <= DataSize &&
131 "Invalid fixup offset!");
133 char *data = Data + Fixup.getOffset();
135 default: llvm_unreachable("Cannot fixup unknown value.");
136 case 1: llvm_unreachable("Cannot fixup 1 byte value.");
137 case 8: llvm_unreachable("Cannot fixup 8 byte value.");
140 *(data+7) = uint8_t(Value);
141 *(data+6) = uint8_t(Value >> 8);
142 *(data+3) = uint8_t(Value >> 16);
143 *(data+2) = uint8_t(Value >> 24);
147 *(data+3) = uint8_t(Value >> 0);
148 *(data+2) = uint8_t(Value >> 8);
151 } // end anonymous namespace
153 TargetAsmBackend *llvm::createMBlazeAsmBackend(const Target &T,
154 const std::string &TT) {
155 switch (Triple(TT).getOS()) {
157 assert(0 && "Mac not supported on MBlaze");
158 case Triple::MinGW32:
161 assert(0 && "Windows not supported on MBlaze");
163 return new ELFMBlazeAsmBackend(T, Triple(TT).getOS());