mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
a55661b6bd
(relocations, e.g.), but this will allow simple things to flow through. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118289 91177308-0d34-0410-b5e6-96231b3b80d8
160 lines
4.8 KiB
C++
160 lines
4.8 KiB
C++
//===-- ARMAsmBackend.cpp - ARM Assembler Backend -------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Target/TargetAsmBackend.h"
|
|
#include "ARM.h"
|
|
//FIXME: add #include "ARMFixupKinds.h"
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/MC/ELFObjectWriter.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCObjectFormat.h"
|
|
#include "llvm/MC/MCObjectWriter.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
#include "llvm/MC/MCSectionMachO.h"
|
|
#include "llvm/MC/MachObjectWriter.h"
|
|
#include "llvm/Support/ELF.h"
|
|
#include "llvm/Support/MachO.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Target/TargetRegistry.h"
|
|
#include "llvm/Target/TargetAsmBackend.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
class ARMAsmBackend : public TargetAsmBackend {
|
|
public:
|
|
ARMAsmBackend(const Target &T)
|
|
: TargetAsmBackend(T) {
|
|
}
|
|
|
|
bool MayNeedRelaxation(const MCInst &Inst) const;
|
|
|
|
void RelaxInstruction(const MCInst &Inst, MCInst &Res) const;
|
|
|
|
bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const;
|
|
|
|
unsigned getPointerSize() const {
|
|
return 4;
|
|
}
|
|
};
|
|
|
|
bool ARMAsmBackend::MayNeedRelaxation(const MCInst &Inst) const {
|
|
// FIXME: Thumb targets, different move constant targets..
|
|
return false;
|
|
}
|
|
|
|
void ARMAsmBackend::RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
|
|
assert(0 && "ARMAsmBackend::RelaxInstruction() unimplemented");
|
|
return;
|
|
}
|
|
|
|
bool ARMAsmBackend::WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
|
|
if ((Count % 4) != 0) {
|
|
// Fixme: % 2 for Thumb?
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
} // end anonymous namespace
|
|
|
|
namespace {
|
|
// FIXME: This should be in a separate file.
|
|
// ELF is an ELF of course...
|
|
class ELFARMAsmBackend : public ARMAsmBackend {
|
|
MCELFObjectFormat Format;
|
|
|
|
public:
|
|
Triple::OSType OSType;
|
|
ELFARMAsmBackend(const Target &T, Triple::OSType _OSType)
|
|
: ARMAsmBackend(T), OSType(_OSType) {
|
|
HasScatteredSymbols = true;
|
|
}
|
|
|
|
virtual const MCObjectFormat &getObjectFormat() const {
|
|
return Format;
|
|
}
|
|
|
|
void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
|
|
uint64_t Value) const;
|
|
|
|
bool isVirtualSection(const MCSection &Section) const {
|
|
const MCSectionELF &SE = static_cast<const MCSectionELF&>(Section);
|
|
return SE.getType() == MCSectionELF::SHT_NOBITS;
|
|
}
|
|
|
|
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
|
|
return new ELFObjectWriter(OS, /*Is64Bit=*/false,
|
|
OSType, ELF::EM_ARM,
|
|
/*IsLittleEndian=*/true,
|
|
/*HasRelocationAddend=*/false);
|
|
}
|
|
};
|
|
|
|
// Fixme: can we raise this to share code between Darwin and ELF?
|
|
void ELFARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
|
|
uint64_t Value) const {
|
|
assert(0 && "ELFARMAsmBackend::ApplyFixup() unimplemented");
|
|
}
|
|
|
|
// FIXME: This should be in a separate file.
|
|
class DarwinARMAsmBackend : public ARMAsmBackend {
|
|
MCMachOObjectFormat Format;
|
|
|
|
public:
|
|
DarwinARMAsmBackend(const Target &T)
|
|
: ARMAsmBackend(T) {
|
|
HasScatteredSymbols = true;
|
|
}
|
|
|
|
virtual const MCObjectFormat &getObjectFormat() const {
|
|
return Format;
|
|
}
|
|
|
|
void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
|
|
uint64_t Value) const;
|
|
|
|
bool isVirtualSection(const MCSection &Section) const {
|
|
const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
|
|
return (SMO.getType() == MCSectionMachO::S_ZEROFILL ||
|
|
SMO.getType() == MCSectionMachO::S_GB_ZEROFILL ||
|
|
SMO.getType() == MCSectionMachO::S_THREAD_LOCAL_ZEROFILL);
|
|
}
|
|
|
|
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
|
|
// FIXME: Subtarget info should be derived. Force v7 for now.
|
|
return new MachObjectWriter(OS, /*Is64Bit=*/false, MachO::CPUTypeARM,
|
|
MachO::CPUSubType_ARM_V7);
|
|
}
|
|
|
|
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
|
|
return false;
|
|
}
|
|
};
|
|
|
|
void DarwinARMAsmBackend::ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
|
|
uint64_t Value) const {
|
|
assert(0 && "DarwinARMAsmBackend::ApplyFixup() unimplemented");
|
|
}
|
|
} // end anonymous namespace
|
|
|
|
TargetAsmBackend *llvm::createARMAsmBackend(const Target &T,
|
|
const std::string &TT) {
|
|
switch (Triple(TT).getOS()) {
|
|
case Triple::Darwin:
|
|
return new DarwinARMAsmBackend(T);
|
|
case Triple::MinGW32:
|
|
case Triple::Cygwin:
|
|
case Triple::Win32:
|
|
assert(0 && "Windows not supported on ARM");
|
|
default:
|
|
return new ELFARMAsmBackend(T, Triple(TT).getOS());
|
|
}
|
|
}
|