1 #include "MCTargetDesc/MipsMCTargetDesc.h"
2 #include "llvm/ADT/Twine.h"
3 #include "llvm/MC/MCAssembler.h"
4 #include "llvm/MC/MCDirectives.h"
5 #include "llvm/MC/MCELFObjectWriter.h"
6 #include "llvm/MC/MCExpr.h"
7 #include "llvm/MC/MCMachObjectWriter.h"
8 #include "llvm/MC/MCObjectWriter.h"
9 #include "llvm/MC/MCSectionELF.h"
10 #include "llvm/MC/MCSectionMachO.h"
11 #include "llvm/MC/MCAsmBackend.h"
12 #include "llvm/MC/MCSubtargetInfo.h"
13 #include "llvm/Object/MachOFormat.h"
14 #include "llvm/Support/ELF.h"
15 #include "llvm/Support/ErrorHandling.h"
16 #include "llvm/Support/raw_ostream.h"
17 using namespace llvm;
18
19 namespace {
20 class MipsELFObjectWriter : public MCELFObjectTargetWriter {
21 public:
MipsELFObjectWriter(bool is64Bit,Triple::OSType OSType,uint16_t EMachine,bool HasRelocationAddend)22 MipsELFObjectWriter(bool is64Bit, Triple::OSType OSType, uint16_t EMachine,
23 bool HasRelocationAddend)
24 : MCELFObjectTargetWriter(is64Bit, OSType, EMachine,
25 HasRelocationAddend) {}
26 };
27
28 class MipsAsmBackend : public MCAsmBackend {
29 public:
MipsAsmBackend(const Target & T)30 MipsAsmBackend(const Target &T)
31 : MCAsmBackend() {}
32
getNumFixupKinds() const33 unsigned getNumFixupKinds() const {
34 return 1; //tbd
35 }
36
37 /// ApplyFixup - Apply the \arg Value for given \arg Fixup into the provided
38 /// data fragment, at the offset specified by the fixup and following the
39 /// fixup kind as appropriate.
ApplyFixup(const MCFixup & Fixup,char * Data,unsigned DataSize,uint64_t Value) const40 void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
41 uint64_t Value) const {
42 }
43
44 /// @name Target Relaxation Interfaces
45 /// @{
46
47 /// MayNeedRelaxation - Check whether the given instruction may need
48 /// relaxation.
49 ///
50 /// \param Inst - The instruction to test.
MayNeedRelaxation(const MCInst & Inst) const51 bool MayNeedRelaxation(const MCInst &Inst) const {
52 return false;
53 }
54
55 /// RelaxInstruction - Relax the instruction in the given fragment to the next
56 /// wider instruction.
57 ///
58 /// \param Inst - The instruction to relax, which may be the same as the
59 /// output.
60 /// \parm Res [output] - On return, the relaxed instruction.
RelaxInstruction(const MCInst & Inst,MCInst & Res) const61 void RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
62 }
63
64 /// @}
65
66 /// WriteNopData - Write an (optimal) nop sequence of Count bytes to the given
67 /// output. If the target cannot generate such a sequence, it should return an
68 /// error.
69 ///
70 /// \return - True on success.
WriteNopData(uint64_t Count,MCObjectWriter * OW) const71 bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
72 return false;
73 }
74 };
75
76 class MipsEB_AsmBackend : public MipsAsmBackend {
77 public:
78 Triple::OSType OSType;
79
MipsEB_AsmBackend(const Target & T,Triple::OSType _OSType)80 MipsEB_AsmBackend(const Target &T, Triple::OSType _OSType)
81 : MipsAsmBackend(T), OSType(_OSType) {}
82
createObjectWriter(raw_ostream & OS) const83 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
84 return createELFObjectWriter(createELFObjectTargetWriter(),
85 OS, /*IsLittleEndian*/ false);
86 }
87
createELFObjectTargetWriter() const88 MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
89 return new MipsELFObjectWriter(false, OSType, ELF::EM_MIPS, false);
90 }
91 };
92
93 class MipsEL_AsmBackend : public MipsAsmBackend {
94 public:
95 Triple::OSType OSType;
96
MipsEL_AsmBackend(const Target & T,Triple::OSType _OSType)97 MipsEL_AsmBackend(const Target &T, Triple::OSType _OSType)
98 : MipsAsmBackend(T), OSType(_OSType) {}
99
createObjectWriter(raw_ostream & OS) const100 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
101 return createELFObjectWriter(createELFObjectTargetWriter(),
102 OS, /*IsLittleEndian*/ true);
103 }
104
createELFObjectTargetWriter() const105 MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
106 return new MipsELFObjectWriter(false, OSType, ELF::EM_MIPS, false);
107 }
108 };
109 }
110
createMipsAsmBackend(const Target & T,StringRef TT)111 MCAsmBackend *llvm::createMipsAsmBackend(const Target &T, StringRef TT) {
112 Triple TheTriple(TT);
113
114 // just return little endian for now
115 //
116 return new MipsEL_AsmBackend(T, Triple(TT).getOS());
117 }
118