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[Sparc] Add ELF Object Writer for Sparc. 

llvm-svn: 198580
This commit is contained in:
Venkatraman Govindaraju 2014-01-06 01:22:54 +00:00
parent 908bf814e7
commit b73aeca888
8 changed files with 287 additions and 12 deletions
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1
llvm/lib/Target/Sparc/MCTargetDesc/CMakeLists.txt
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@ -1,5 +1,6 @@
add_llvm_library(LLVMSparcDesc
SparcAsmBackend.cpp
SparcELFObjectWriter.cpp
SparcMCAsmInfo.cpp
SparcMCCodeEmitter.cpp
SparcMCTargetDesc.cpp

71
llvm/lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp
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@ -10,17 +10,50 @@
#include "llvm/MC/MCAsmBackend.h"
#include "MCTargetDesc/SparcMCTargetDesc.h"
#include "MCTargetDesc/SparcFixupKinds.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
switch (Kind) {
default:
llvm_unreachable("Unknown fixup kind!");
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case FK_Data_8:
return Value;
case Sparc::fixup_sparc_call30:
return Value & 0x3fffffff;
case Sparc::fixup_sparc_br22:
return Value & 0x3fffff;
case Sparc::fixup_sparc_br19:
return Value & 0x1ffff;
case Sparc::fixup_sparc_hi22:
return (Value >> 10) & 0x3fffff;
case Sparc::fixup_sparc_lo10:
return Value & 0x3ff;
case Sparc::fixup_sparc_h44:
return (Value >> 22) & 0x3fffff;
case Sparc::fixup_sparc_m44:
return (Value >> 12) & 0x3ff;
case Sparc::fixup_sparc_l44:
return Value & 0xfff;
case Sparc::fixup_sparc_hh:
return (Value >> 42) & 0x3fffff;
case Sparc::fixup_sparc_hm:
return (Value >>32) & 0x3ff;
}
}
namespace {
class SparcAsmBackend : public MCAsmBackend {
const Target &TheTarget;
public:
SparcAsmBackend(const Target &T) : MCAsmBackend() {}
SparcAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
unsigned getNumFixupKinds() const {
return Sparc::NumTargetFixupKinds;
@ -31,7 +64,14 @@ namespace {
// name offset bits flags
{ "fixup_sparc_call30", 0, 30, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_sparc_br22", 0, 22, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_sparc_br19", 0, 19, MCFixupKindInfo::FKF_IsPCRel }
{ "fixup_sparc_br19", 0, 19, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_sparc_hi22", 0, 22, 0 },
{ "fixup_sparc_lo10", 0, 10, 0 },
{ "fixup_sparc_h44", 0, 22, 0 },
{ "fixup_sparc_m44", 0, 10, 0 },
{ "fixup_sparc_l44", 0, 12, 0 },
{ "fixup_sparc_hh", 0, 21, 0 },
{ "fixup_sparc_hm", 0, 10, 0 },
};
if (Kind < FirstTargetFixupKind)
@ -68,21 +108,38 @@ namespace {
OW->Write8(0);
return true;
}
bool is64Bit() const {
StringRef name = TheTarget.getName();
return name == "sparcv9";
}
};
class ELFSparcAsmBackend : public SparcAsmBackend {
Triple::OSType OSType;
public:
ELFSparcAsmBackend(const Target &T, Triple::OSType OSType) :
SparcAsmBackend(T) { }
SparcAsmBackend(T), OSType(OSType) { }
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t Value) const {
assert(0 && "applyFixup not implemented yet");
Value = adjustFixupValue(Fixup.getKind(), Value);
if (!Value) return; // Doesn't change encoding.
unsigned Offset = Fixup.getOffset();
// For each byte of the fragment that the fixup touches, mask in the bits
// from the fixup value. The Value has been "split up" into the
// appropriate bitfields above.
for (unsigned i = 0; i != 4; ++i)
Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff);
}
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
assert(0 && "Object Writer not implemented yet");
return 0;
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(OSType);
return createSparcELFObjectWriter(OS, is64Bit(), OSABI);
}
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {

86
llvm/lib/Target/Sparc/MCTargetDesc/SparcELFObjectWriter.cpp Normal file
View File

@ -0,0 +1,86 @@
//===-- SparcELFObjectWriter.cpp - Sparc 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/SparcMCTargetDesc.h"
#include "MCTargetDesc/SparcFixupKinds.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
namespace {
class SparcELFObjectWriter : public MCELFObjectTargetWriter {
public:
SparcELFObjectWriter(bool Is64Bit, uint8_t OSABI)
: MCELFObjectTargetWriter(Is64Bit, OSABI,
Is64Bit ? ELF::EM_SPARCV9 : ELF::EM_SPARC,
/*HasRelocationAddend*/ true) {}
virtual ~SparcELFObjectWriter() {}
protected:
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel, bool IsRelocWithSymbol,
int64_t Addend) const;
};
}
unsigned SparcELFObjectWriter::GetRelocType(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel,
bool IsRelocWithSymbol,
int64_t Addend) const {
if (IsPCRel) {
switch((unsigned)Fixup.getKind()) {
default:
llvm_unreachable("Unimplemented fixup -> relocation");
case FK_Data_1: return ELF::R_SPARC_DISP8;
case FK_Data_2: return ELF::R_SPARC_DISP16;
case FK_Data_4: return ELF::R_SPARC_DISP32;
case FK_Data_8: return ELF::R_SPARC_DISP64;
case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30;
case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22;
case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19;
}
}
switch((unsigned)Fixup.getKind()) {
default:
llvm_unreachable("Unimplemented fixup -> relocation");
case FK_Data_1: return ELF::R_SPARC_8;
case FK_Data_2: return ((Fixup.getOffset() % 2)
? ELF::R_SPARC_UA16
: ELF::R_SPARC_16);
case FK_Data_4: return ((Fixup.getOffset() % 4)
? ELF::R_SPARC_UA32
: ELF::R_SPARC_32);
case FK_Data_8: return ((Fixup.getOffset() % 8)
? ELF::R_SPARC_UA64
: ELF::R_SPARC_64);
case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22;
case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10;
case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44;
case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44;
case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44;
case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22;
case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10;
}
return ELF::R_SPARC_NONE;
}
MCObjectWriter *llvm::createSparcELFObjectWriter(raw_ostream &OS,
bool Is64Bit,
uint8_t OSABI) {
MCELFObjectTargetWriter *MOTW = new SparcELFObjectWriter(Is64Bit, OSABI);
return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);
}

24
llvm/lib/Target/Sparc/MCTargetDesc/SparcFixupKinds.h
View File

@ -22,10 +22,32 @@ namespace llvm {
/// branches
fixup_sparc_br22,
/// fixup_sparc_br22 - 22-bit PC relative relocation for
/// fixup_sparc_br19 - 19-bit PC relative relocation for
/// branches on icc/xcc
fixup_sparc_br19,
/// fixup_sparc_hi22 - 22-bit fixup corresponding to %hi(foo)
/// for sethi
fixup_sparc_hi22,
/// fixup_sparc_lo10 - 10-bit fixup corresponding to %lo(foo)
fixup_sparc_lo10,
/// fixup_sparc_h44 - 22-bit fixup corresponding to %h44(foo)
fixup_sparc_h44,
/// fixup_sparc_m44 - 10-bit fixup corresponding to %m44(foo)
fixup_sparc_m44,
/// fixup_sparc_l44 - 12-bit fixup corresponding to %l44(foo)
fixup_sparc_l44,
/// fixup_sparc_hh - 22-bit fixup corresponding to %hh(foo)
fixup_sparc_hh,
/// fixup_sparc_hm - 10-bit fixup corresponding to %hm(foo)
fixup_sparc_hm,
// Marker
LastTargetFixupKind,
NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind

36
llvm/lib/Target/Sparc/MCTargetDesc/SparcMCCodeEmitter.cpp
View File

@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mccodeemitter"
#include "SparcMCExpr.h"
#include "SparcMCTargetDesc.h"
#include "MCTargetDesc/SparcFixupKinds.h"
#include "llvm/MC/MCCodeEmitter.h"
@ -92,6 +93,41 @@ getMachineOpValue(const MCInst &MI, const MCOperand &MO,
assert(MO.isExpr());
const MCExpr *Expr = MO.getExpr();
if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Expr)) {
switch(SExpr->getKind()) {
default: assert(0 && "Unhandled sparc expression!"); break;
case SparcMCExpr::VK_Sparc_LO:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_lo10));
break;
case SparcMCExpr::VK_Sparc_HI:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_hi22));
break;
case SparcMCExpr::VK_Sparc_H44:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_h44));
break;
case SparcMCExpr::VK_Sparc_M44:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_m44));
break;
case SparcMCExpr::VK_Sparc_L44:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_l44));
break;
case SparcMCExpr::VK_Sparc_HH:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_hh));
break;
case SparcMCExpr::VK_Sparc_HM:
Fixups.push_back(MCFixup::Create(0, Expr,
(MCFixupKind)Sparc::fixup_sparc_hm));
break;
}
return 0;
}
int64_t Res;
if (Expr->EvaluateAsAbsolute(Res))
return Res;

58
llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
View File

@ -70,15 +70,67 @@ void SparcMCExpr::PrintImpl(raw_ostream &OS) const
bool
SparcMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
const MCAsmLayout *Layout) const {
assert(0 && "FIXME: Implement SparcMCExpr::EvaluateAsRelocatableImpl");
return getSubExpr()->EvaluateAsRelocatable(Res, *Layout);
}
static void fixELFSymbolsInTLSFixupsImpl(const MCExpr *Expr, MCAssembler &Asm) {
assert(0 && "Implement fixELFSymbolsInTLSFixupsImpl!");
}
void SparcMCExpr::fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {
assert(0 && "FIXME: Implement SparcMCExpr::fixELFSymbolsInTLSFixups");
switch(getKind()) {
default: return;
case VK_Sparc_TLS_GD_HI22:
case VK_Sparc_TLS_GD_LO10:
case VK_Sparc_TLS_GD_ADD:
case VK_Sparc_TLS_GD_CALL:
case VK_Sparc_TLS_LDM_HI22:
case VK_Sparc_TLS_LDM_LO10:
case VK_Sparc_TLS_LDM_ADD:
case VK_Sparc_TLS_LDM_CALL:
case VK_Sparc_TLS_LDO_HIX22:
case VK_Sparc_TLS_LDO_LOX10:
case VK_Sparc_TLS_LDO_ADD:
case VK_Sparc_TLS_IE_HI22:
case VK_Sparc_TLS_IE_LO10:
case VK_Sparc_TLS_IE_LD:
case VK_Sparc_TLS_IE_LDX:
case VK_Sparc_TLS_IE_ADD:
case VK_Sparc_TLS_LE_HIX22:
case VK_Sparc_TLS_LE_LOX10: break;
}
fixELFSymbolsInTLSFixupsImpl(getSubExpr(), Asm);
}
// FIXME: This basically copies MCObjectStreamer::AddValueSymbols. Perhaps
// that method should be made public?
// FIXME: really do above: now that at least three other backends are using it.
static void AddValueSymbolsImpl(const MCExpr *Value, MCAssembler *Asm) {
switch (Value->getKind()) {
case MCExpr::Target:
llvm_unreachable("Can't handle nested target expr!");
break;
case MCExpr::Constant:
break;
case MCExpr::Binary: {
const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
AddValueSymbolsImpl(BE->getLHS(), Asm);
AddValueSymbolsImpl(BE->getRHS(), Asm);
break;
}
case MCExpr::SymbolRef:
Asm->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
break;
case MCExpr::Unary:
AddValueSymbolsImpl(cast<MCUnaryExpr>(Value)->getSubExpr(), Asm);
break;
}
}
void SparcMCExpr::AddValueSymbols(MCAssembler *Asm) const {
assert(0 && "FIXME: Implement SparcMCExpr::AddValueSymbols");
AddValueSymbolsImpl(getSubExpr(), Asm);
}

15
llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp
View File

@ -89,6 +89,14 @@ static MCCodeGenInfo *createSparcV9MCCodeGenInfo(StringRef TT, Reloc::Model RM,
return X;
}
static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *Emitter,
bool RelaxAll, bool NoExecStack) {
SparcTargetELFStreamer *S = new SparcTargetELFStreamer();
return createELFStreamer(Context, S, MAB, OS, Emitter, RelaxAll, NoExecStack);
}
static MCStreamer *
createMCAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS,
bool isVerboseAsm, bool useLoc, bool useCFI,
@ -148,6 +156,13 @@ extern "C" void LLVMInitializeSparcTargetMC() {
TargetRegistry::RegisterMCAsmBackend(TheSparcV9Target,
createSparcAsmBackend);
// Register the object streamer.
TargetRegistry::RegisterMCObjectStreamer(TheSparcTarget,
createMCStreamer);
TargetRegistry::RegisterMCObjectStreamer(TheSparcV9Target,
createMCStreamer);
// Register the asm streamer.
TargetRegistry::RegisterAsmStreamer(TheSparcTarget,
createMCAsmStreamer);
TargetRegistry::RegisterAsmStreamer(TheSparcV9Target,

8
llvm/lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.h
View File

@ -14,15 +14,19 @@
#ifndef SPARCMCTARGETDESC_H
#define SPARCMCTARGETDESC_H
#include "llvm/Support/DataTypes.h"
namespace llvm {
class MCAsmBackend;
class MCCodeEmitter;
class MCContext;
class MCInstrInfo;
class MCObjectWriter;
class MCRegisterInfo;
class MCSubtargetInfo;
class Target;
class StringRef;
class raw_ostream;
extern Target TheSparcTarget;
extern Target TheSparcV9Target;
@ -35,7 +39,9 @@ MCAsmBackend *createSparcAsmBackend(const Target &T,
const MCRegisterInfo &MRI,
StringRef TT,
StringRef CPU);
MCObjectWriter *createSparcELFObjectWriter(raw_ostream &OS,
bool Is64Bit,
uint8_t OSABI);
} // End llvm namespace
// Defines symbolic names for Sparc registers. This defines a mapping from