llvm::AArch64MCLFIRewriter Class Reference

Rewrites AArch64 instructions for LFI sandboxing. More...

#include "Target/AArch64/MCTargetDesc/AArch64MCLFIRewriter.h"

Inheritance diagram for llvm::AArch64MCLFIRewriter:

Public Member Functions
	AArch64MCLFIRewriter (MCContext &Ctx, std::unique_ptr< MCRegisterInfo > &&RI, std::unique_ptr< MCInstrInfo > &&II)
bool	rewriteInst (const MCInst &Inst, MCStreamer &Out, const MCSubtargetInfo &STI) override
Public Member Functions inherited from llvm::MCLFIRewriter
	MCLFIRewriter (MCContext &Ctx, std::unique_ptr< MCRegisterInfo > &&RI, std::unique_ptr< MCInstrInfo > &&II)
LLVM_ABI void	error (const MCInst &Inst, const Twine &Msg)
LLVM_ABI void	warning (const MCInst &Inst, const Twine &Msg)
void	disable ()
void	enable ()
LLVM_ABI bool	isCall (const MCInst &Inst) const
LLVM_ABI bool	isBranch (const MCInst &Inst) const
LLVM_ABI bool	isIndirectBranch (const MCInst &Inst) const
LLVM_ABI bool	isReturn (const MCInst &Inst) const
LLVM_ABI bool	mayLoad (const MCInst &Inst) const
LLVM_ABI bool	mayStore (const MCInst &Inst) const
LLVM_ABI bool	mayModifyRegister (const MCInst &Inst, MCRegister Reg) const
LLVM_ABI bool	explicitlyModifiesRegister (const MCInst &Inst, MCRegister Reg) const
virtual	~MCLFIRewriter ()=default
virtual void	onLabel (const MCSymbol *Symbol)

Additional Inherited Members
Protected Attributes inherited from llvm::MCLFIRewriter
bool	Enabled = true
std::unique_ptr< MCInstrInfo >	InstInfo
std::unique_ptr< MCRegisterInfo >	RegInfo

Detailed Description

Rewrites AArch64 instructions for LFI sandboxing.

This class implements the LFI (Lightweight Fault Isolation) rewriting for AArch64 instructions. It transforms instructions to ensure memory accesses and control flow are confined within the sandbox region.

Reserved registers:

• X27: Sandbox base address (always holds the base)
• X28: Safe address register (always within sandbox)
• X26: Scratch register for intermediate calculations
• X25: context register (points to thread-local runtime data)
• SP: Stack pointer (always within sandbox)
• X30: Link register (always within sandbox)

Definition at line 41 of file AArch64MCLFIRewriter.h.

Constructor & Destructor Documentation

AArch64MCLFIRewriter()

llvm::AArch64MCLFIRewriter::AArch64MCLFIRewriter ( MCContext & Ctx, std::unique_ptr< MCRegisterInfo > && RI, std::unique_ptr< MCInstrInfo > && II )

inline

Definition at line 43 of file AArch64MCLFIRewriter.h.

References II, llvm::MCLFIRewriter::MCLFIRewriter(), and llvm::move().

Member Function Documentation

rewriteInst()

bool AArch64MCLFIRewriter::rewriteInst ( const MCInst & Inst, MCStreamer & Out, const MCSubtargetInfo & STI )

overridevirtual

Implements llvm::MCLFIRewriter.

Definition at line 278 of file AArch64MCLFIRewriter.cpp.

References llvm::MCLFIRewriter::Enabled.

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The documentation for this class was generated from the following files:

• lib/Target/AArch64/MCTargetDesc/AArch64MCLFIRewriter.h
• lib/Target/AArch64/MCTargetDesc/AArch64MCLFIRewriter.cpp