mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-21 12:02:58 +02:00
ae65e281f3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
//===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ARMTargetObjectFile.h"
|
|
#include "ARMSubtarget.h"
|
|
#include "ARMTargetMachine.h"
|
|
#include "llvm/BinaryFormat/Dwarf.h"
|
|
#include "llvm/BinaryFormat/ELF.h"
|
|
#include "llvm/MC/MCAsmInfo.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
#include "llvm/MC/MCTargetOptions.h"
|
|
#include "llvm/MC/SectionKind.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include <cassert>
|
|
|
|
using namespace llvm;
|
|
using namespace dwarf;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ELF Target
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
|
|
const TargetMachine &TM) {
|
|
const ARMBaseTargetMachine &ARM_TM = static_cast<const ARMBaseTargetMachine &>(TM);
|
|
bool isAAPCS_ABI = ARM_TM.TargetABI == ARMBaseTargetMachine::ARMABI::ARM_ABI_AAPCS;
|
|
bool genExecuteOnly =
|
|
ARM_TM.getMCSubtargetInfo()->hasFeature(ARM::FeatureExecuteOnly);
|
|
|
|
TargetLoweringObjectFileELF::Initialize(Ctx, TM);
|
|
InitializeELF(isAAPCS_ABI);
|
|
|
|
if (isAAPCS_ABI) {
|
|
LSDASection = nullptr;
|
|
}
|
|
|
|
// Make code section unreadable when in execute-only mode
|
|
if (genExecuteOnly) {
|
|
unsigned Type = ELF::SHT_PROGBITS;
|
|
unsigned Flags =
|
|
ELF::SHF_EXECINSTR | ELF::SHF_ALLOC | ELF::SHF_ARM_PURECODE;
|
|
// Since we cannot modify flags for an existing section, we create a new
|
|
// section with the right flags, and use 0 as the unique ID for
|
|
// execute-only text
|
|
TextSection = Ctx.getELFSection(".text", Type, Flags, 0, "", 0U);
|
|
}
|
|
}
|
|
|
|
const MCExpr *ARMElfTargetObjectFile::getTTypeGlobalReference(
|
|
const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
|
|
MachineModuleInfo *MMI, MCStreamer &Streamer) const {
|
|
if (TM.getMCAsmInfo()->getExceptionHandlingType() != ExceptionHandling::ARM)
|
|
return TargetLoweringObjectFileELF::getTTypeGlobalReference(
|
|
GV, Encoding, TM, MMI, Streamer);
|
|
|
|
assert(Encoding == DW_EH_PE_absptr && "Can handle absptr encoding only");
|
|
|
|
return MCSymbolRefExpr::create(TM.getSymbol(GV),
|
|
MCSymbolRefExpr::VK_ARM_TARGET2, getContext());
|
|
}
|
|
|
|
const MCExpr *ARMElfTargetObjectFile::
|
|
getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
|
|
return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_ARM_TLSLDO,
|
|
getContext());
|
|
}
|
|
|
|
static bool isExecuteOnlyFunction(const GlobalObject *GO, SectionKind SK,
|
|
const TargetMachine &TM) {
|
|
if (const Function *F = dyn_cast<Function>(GO))
|
|
if (TM.getSubtarget<ARMSubtarget>(*F).genExecuteOnly() && SK.isText())
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
MCSection *ARMElfTargetObjectFile::getExplicitSectionGlobal(
|
|
const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
|
|
// Set execute-only access for the explicit section
|
|
if (isExecuteOnlyFunction(GO, SK, TM))
|
|
SK = SectionKind::getExecuteOnly();
|
|
|
|
return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, SK, TM);
|
|
}
|
|
|
|
MCSection *ARMElfTargetObjectFile::SelectSectionForGlobal(
|
|
const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
|
|
// Place the global in the execute-only text section
|
|
if (isExecuteOnlyFunction(GO, SK, TM))
|
|
SK = SectionKind::getExecuteOnly();
|
|
|
|
return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, SK, TM);
|
|
}
|