LLVM  13.0.0git
Macros | Functions | Variables
X86SpeculativeExecutionSideEffectSuppression.cpp File Reference
#include "X86.h"
#include "X86InstrInfo.h"
#include "X86Subtarget.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/Pass.h"
#include "llvm/Target/TargetMachine.h"
Include dependency graph for X86SpeculativeExecutionSideEffectSuppression.cpp:

Go to the source code of this file.

Macros

#define DEBUG_TYPE   "x86-seses"
 

Functions

 STATISTIC (NumLFENCEsInserted, "Number of lfence instructions inserted")
 
static bool hasConstantAddressingMode (const MachineInstr &MI)
 

Variables

static cl::opt< bool > EnableSpeculativeExecutionSideEffectSuppression ("x86-seses-enable-without-lvi-cfi", cl::desc("Force enable speculative execution side effect suppression. " "(Note: User must pass -mlvi-cfi in order to mitigate indirect " "branches and returns.)"), cl::init(false), cl::Hidden)
 
static cl::opt< bool > OneLFENCEPerBasicBlock ("x86-seses-one-lfence-per-bb", cl::desc("Omit all lfences other than the first to be placed in a basic block."), cl::init(false), cl::Hidden)
 
static cl::opt< bool > OnlyLFENCENonConst ("x86-seses-only-lfence-non-const", cl::desc("Only lfence before groups of terminators where at least one " "branch instruction has an input to the addressing mode that is a " "register other than %rip."), cl::init(false), cl::Hidden)
 
static cl::opt< bool > OmitBranchLFENCEs ("x86-seses-omit-branch-lfences", cl::desc("Omit all lfences before branch instructions."), cl::init(false), cl::Hidden)
 

Detailed Description

This file contains the X86 implementation of the speculative execution side effect suppression mitigation.

This must be used with the -mlvi-cfi flag in order to mitigate indirect branches and returns.

Definition in file X86SpeculativeExecutionSideEffectSuppression.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "x86-seses"

Function Documentation

◆ hasConstantAddressingMode()

static bool hasConstantAddressingMode ( const MachineInstr MI)
static

Definition at line 81 of file X86SpeculativeExecutionSideEffectSuppression.cpp.

References MI.

◆ STATISTIC()

STATISTIC ( NumLFENCEsInserted  ,
"Number of lfence instructions inserted"   
)

Variable Documentation

◆ EnableSpeculativeExecutionSideEffectSuppression

cl::opt<bool> EnableSpeculativeExecutionSideEffectSuppression("x86-seses-enable-without-lvi-cfi", cl::desc("Force enable speculative execution side effect suppression. " "(Note: User must pass -mlvi-cfi in order to mitigate indirect " "branches and returns.)"), cl::init(false), cl::Hidden)
static

◆ OmitBranchLFENCEs

cl::opt<bool> OmitBranchLFENCEs("x86-seses-omit-branch-lfences", cl::desc("Omit all lfences before branch instructions."), cl::init(false), cl::Hidden)
static

◆ OneLFENCEPerBasicBlock

cl::opt<bool> OneLFENCEPerBasicBlock("x86-seses-one-lfence-per-bb", cl::desc( "Omit all lfences other than the first to be placed in a basic block."), cl::init(false), cl::Hidden)
static

◆ OnlyLFENCENonConst

cl::opt<bool> OnlyLFENCENonConst("x86-seses-only-lfence-non-const", cl::desc("Only lfence before groups of terminators where at least one " "branch instruction has an input to the addressing mode that is a " "register other than %rip."), cl::init(false), cl::Hidden)
static