PPCAsmBackend.cpp revision 370b78d795154899a22ca2b4674e890661ff1d59
1b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===// 2b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 3b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// The LLVM Compiler Infrastructure 4b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 5b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// This file is distributed under the University of Illinois Open Source 6b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// License. See LICENSE.TXT for details. 7b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 8b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner//===----------------------------------------------------------------------===// 9b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 1078c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Cheng#include "llvm/MC/MCAsmBackend.h" 11966aeb5788c242cfaca35c56c0ddc0ff778d4376Evan Cheng#include "MCTargetDesc/PPCMCTargetDesc.h" 12966aeb5788c242cfaca35c56c0ddc0ff778d4376Evan Cheng#include "MCTargetDesc/PPCFixupKinds.h" 132c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/MC/MCELFObjectWriter.h" 14aa4b7dd13ba83152473950d7014a29686dc7eef6Daniel Dunbar#include "llvm/MC/MCMachObjectWriter.h" 15b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner#include "llvm/MC/MCSectionMachO.h" 16b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner#include "llvm/MC/MCObjectWriter.h" 17ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach#include "llvm/MC/MCValue.h" 1836d76a8dbc87b62de82a4a8c0d7cb4bb2a202934Daniel Dunbar#include "llvm/Object/MachOFormat.h" 192c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/Support/ELF.h" 202c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/Support/ErrorHandling.h" 213e74d6fdd248e20a280f1dff3da9a6c689c2c4c3Evan Cheng#include "llvm/Support/TargetRegistry.h" 22b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnerusing namespace llvm; 23b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 242c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divackystatic unsigned adjustFixupValue(unsigned Kind, uint64_t Value) { 252c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky switch (Kind) { 262c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky default: 272c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky llvm_unreachable("Unknown fixup kind!"); 282c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_1: 292c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_2: 302c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_4: 312c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value; 322c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_brcond14: 332c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0x3ffc; 342c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_br24: 352c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0x3fffffc; 362c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#if 0 372c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_hi16: 382c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return (Value >> 16) & 0xffff; 392c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#endif 402c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_ha16: 412c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff; 422c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_lo16: 432c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0xffff; 442c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 452c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky} 462c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 47b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnernamespace { 48ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbarclass PPCMachObjectWriter : public MCMachObjectTargetWriter { 495d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbarpublic: 505d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar PPCMachObjectWriter(bool Is64Bit, uint32_t CPUType, 515d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar uint32_t CPUSubtype) 525d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {} 53ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach 54ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach void RecordRelocation(MachObjectWriter *Writer, 55ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach const MCAssembler &Asm, const MCAsmLayout &Layout, 56ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach const MCFragment *Fragment, const MCFixup &Fixup, 57ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach MCValue Target, uint64_t &FixedValue) {} 58ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbar}; 59ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbar 602c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divackyclass PPCELFObjectWriter : public MCELFObjectTargetWriter { 612c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divackypublic: 622c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky PPCELFObjectWriter(bool Is64Bit, Triple::OSType OSType, uint16_t EMachine, 632c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky bool HasRelocationAddend, bool isLittleEndian) 642c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky : MCELFObjectTargetWriter(Is64Bit, OSType, EMachine, HasRelocationAddend) {} 652c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky}; 662c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 6778c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Chengclass PPCAsmBackend : public MCAsmBackend { 68297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbarconst Target &TheTarget; 69297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbarpublic: 7078c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Cheng PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {} 712761fc427082215c2affcc9d8db8491400bc9e5dDaniel Dunbar 72297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; } 73297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 74297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const { 75297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = { 76297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // name offset bits flags 77297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel }, 78297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel }, 79297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_lo16", 16, 16, 0 }, 80297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_ha16", 16, 16, 0 }, 81297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_lo14", 16, 14, 0 } 82297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar }; 83297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 84297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar if (Kind < FirstTargetFixupKind) 8578c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Cheng return MCAsmBackend::getFixupKindInfo(Kind); 86297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 87297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() && 88297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar "Invalid kind!"); 89297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return Infos[Kind - FirstTargetFixupKind]; 90297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 91297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 92297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar bool MayNeedRelaxation(const MCInst &Inst) const { 93297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME. 94297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return false; 95297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 96370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach 97370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach bool fixupNeedsRelaxation(const MCFixup &Fixup, 98370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach uint64_t Value, 99370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach const MCInstFragment *DF, 100370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach const MCAsmLayout &Layout) const { 101370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach // FIXME. 102370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach assert(0 && "RelaxInstruction() unimplemented"); 103370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach } 104370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach 105297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 106297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar void RelaxInstruction(const MCInst &Inst, MCInst &Res) const { 107297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME. 108297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar assert(0 && "RelaxInstruction() unimplemented"); 109297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 110297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 111297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const { 112297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME: Zero fill for now. That's not right, but at least will get the 113297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // section size right. 114297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar for (uint64_t i = 0; i != Count; ++i) 115297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar OW->Write8(0); 116297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return true; 117297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 118297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 119297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar unsigned getPointerSize() const { 120297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar StringRef Name = TheTarget.getName(); 121297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar if (Name == "ppc64") return 8; 122297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar assert(Name == "ppc32" && "Unknown target name!"); 123297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return 4; 124297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 125297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar}; 126b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} // end anonymous namespace 127b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 128b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 129b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// FIXME: This should be in a separate file. 130b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnernamespace { 131b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner class DarwinPPCAsmBackend : public PPCAsmBackend { 132b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner public: 1337b62afac0a6f967e7466e60ceb26bfdcff2e59f4Daniel Dunbar DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { } 134b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 135179821ac1f282ef6f8d24d5ea346028aee8ba4c7Rafael Espindola void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 136b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner uint64_t Value) const { 137b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner assert(0 && "UNIMP"); 138b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 139b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 140b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner MCObjectWriter *createObjectWriter(raw_ostream &OS) const { 141b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner bool is64 = getPointerSize() == 8; 1425d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar return createMachObjectWriter(new PPCMachObjectWriter( 1435d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar /*Is64Bit=*/is64, 1445d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar (is64 ? object::mach::CTM_PowerPC64 : 1455d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar object::mach::CTM_PowerPC), 1465d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar object::mach::CSPPC_ALL), 1475d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar OS, /*IsLittleEndian=*/false); 148b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 149b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 150b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner virtual bool doesSectionRequireSymbols(const MCSection &Section) const { 151b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner return false; 152b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 153b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner }; 1542c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1552c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky class ELFPPCAsmBackend : public PPCAsmBackend { 1562c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky Triple::OSType OSType; 1572c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky public: 1582c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky ELFPPCAsmBackend(const Target &T, Triple::OSType OSType) : 1592c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky PPCAsmBackend(T), OSType(OSType) { } 1602c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1612c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 1622c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky uint64_t Value) const { 1632c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky Value = adjustFixupValue(Fixup.getKind(), Value); 1642c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky if (!Value) return; // Doesn't change encoding. 1652c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1662c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky unsigned Offset = Fixup.getOffset(); 1672c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1682c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // For each byte of the fragment that the fixup touches, mask in the bits from 1692c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // the fixup value. The Value has been "split up" into the appropriate 1702c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // bitfields above. 1712c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky for (unsigned i = 0; i != 4; ++i) 1722c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff); 1732c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 1742c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1752c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky MCObjectWriter *createObjectWriter(raw_ostream &OS) const { 1762c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky bool is64 = getPointerSize() == 8; 1772c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return createELFObjectWriter(new PPCELFObjectWriter( 1782c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky /*Is64Bit=*/is64, 1792c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky OSType, 1802c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky is64 ? ELF::EM_PPC64 : ELF::EM_PPC, 1812c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky /*addend*/ true, /*isLittleEndian*/ false), 1822c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky OS, /*IsLittleEndian=*/false); 1832c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 1842c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1852c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky virtual bool doesSectionRequireSymbols(const MCSection &Section) const { 1862c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return false; 1872c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 1882c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky }; 1892c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 190b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} // end anonymous namespace 191b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 192b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 193b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 194b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 19578c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan ChengMCAsmBackend *llvm::createPPCAsmBackend(const Target &T, StringRef TT) { 196912225e18559a73228099330a4c253fdccf9fa3dDaniel Dunbar if (Triple(TT).isOSDarwin()) 197b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner return new DarwinPPCAsmBackend(T); 198912225e18559a73228099330a4c253fdccf9fa3dDaniel Dunbar 1992c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return new ELFPPCAsmBackend(T, Triple(TT).getOS()); 200b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} 201