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This implements execute-only support for ARM code generation, which prevents the compiler from generating data accesses to code sections. The following changes are involved: * Add the CodeGen option "-arm-execute-only" to the ARM code generator. * Add the clang flag "-mexecute-only" as well as the GCC-compatible alias "-mpure-code" to enable this option. * When enabled, literal pools are replaced with MOVW/MOVT instructions, with VMOV used in addition for floating-point literals. As the MOVT instruction is required, execute-only support is only available in Thumb mode for targets supporting ARMv8-M baseline or Thumb2. * Jump tables are placed in data sections when in execute-only mode. * The execute-only text section is assigned section ID 0, and is marked as unreadable with the SHF_ARM_PURECODE flag with symbol 'y'. This also overrides selection of ELF sections for globals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289784 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===-- llvm/Target/ARMTargetObjectFile.h - ARM Object Info -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMTARGETOBJECTFILE_H
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#define LLVM_LIB_TARGET_ARM_ARMTARGETOBJECTFILE_H
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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namespace llvm {
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class MCContext;
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class TargetMachine;
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class ARMElfTargetObjectFile : public TargetLoweringObjectFileELF {
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mutable bool genExecuteOnly = false;
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protected:
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const MCSection *AttributesSection;
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public:
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ARMElfTargetObjectFile()
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: TargetLoweringObjectFileELF(), AttributesSection(nullptr) {
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PLTRelativeVariantKind = MCSymbolRefExpr::VK_ARM_PREL31;
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}
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void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
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const MCExpr *getTTypeGlobalReference(const GlobalValue *GV,
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unsigned Encoding,
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const TargetMachine &TM,
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MachineModuleInfo *MMI,
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MCStreamer &Streamer) const override;
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/// \brief Describe a TLS variable address within debug info.
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const MCExpr *getDebugThreadLocalSymbol(const MCSymbol *Sym) const override;
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MCSection *getExplicitSectionGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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MCSection *SelectSectionForGlobal(const GlobalObject *GO, SectionKind Kind,
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const TargetMachine &TM) const override;
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};
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} // end namespace llvm
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#endif
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