LLVM  14.0.0git
Macros | Variables
X86IndirectThunks.cpp File Reference
#include "X86.h"
#include "X86InstrBuilder.h"
#include "X86Subtarget.h"
#include "llvm/CodeGen/IndirectThunks.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
Include dependency graph for X86IndirectThunks.cpp:

Go to the source code of this file.

Macros

#define DEBUG_TYPE   "x86-retpoline-thunks"
 

Variables

static const char RetpolineNamePrefix [] = "__llvm_retpoline_"
 
static const char R11RetpolineName [] = "__llvm_retpoline_r11"
 
static const char EAXRetpolineName [] = "__llvm_retpoline_eax"
 
static const char ECXRetpolineName [] = "__llvm_retpoline_ecx"
 
static const char EDXRetpolineName [] = "__llvm_retpoline_edx"
 
static const char EDIRetpolineName [] = "__llvm_retpoline_edi"
 
static const char LVIThunkNamePrefix [] = "__llvm_lvi_thunk_"
 
static const char R11LVIThunkName [] = "__llvm_lvi_thunk_r11"
 

Detailed Description

Pass that injects an MI thunk that is used to lower indirect calls in a way that prevents speculation on some x86 processors and can be used to mitigate security vulnerabilities due to targeted speculative execution and side channels such as CVE-2017-5715.

Currently supported thunks include:

Note that the reason that this is implemented as a MachineFunctionPass and not a ModulePass is that ModulePasses at this point in the LLVM X86 pipeline serialize all transformations, which can consume lots of memory.

TODO(chandlerc): All of this code could use better comments and documentation.

Definition in file X86IndirectThunks.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "x86-retpoline-thunks"

Definition at line 48 of file X86IndirectThunks.cpp.

Variable Documentation

◆ EAXRetpolineName

const char EAXRetpolineName[] = "__llvm_retpoline_eax"
static

Definition at line 52 of file X86IndirectThunks.cpp.

◆ ECXRetpolineName

const char ECXRetpolineName[] = "__llvm_retpoline_ecx"
static

Definition at line 53 of file X86IndirectThunks.cpp.

◆ EDIRetpolineName

const char EDIRetpolineName[] = "__llvm_retpoline_edi"
static

Definition at line 55 of file X86IndirectThunks.cpp.

◆ EDXRetpolineName

const char EDXRetpolineName[] = "__llvm_retpoline_edx"
static

Definition at line 54 of file X86IndirectThunks.cpp.

◆ LVIThunkNamePrefix

const char LVIThunkNamePrefix[] = "__llvm_lvi_thunk_"
static

Definition at line 57 of file X86IndirectThunks.cpp.

◆ R11LVIThunkName

const char R11LVIThunkName[] = "__llvm_lvi_thunk_r11"
static

Definition at line 58 of file X86IndirectThunks.cpp.

◆ R11RetpolineName

const char R11RetpolineName[] = "__llvm_retpoline_r11"
static

Definition at line 51 of file X86IndirectThunks.cpp.

◆ RetpolineNamePrefix

const char RetpolineNamePrefix[] = "__llvm_retpoline_"
static

Definition at line 50 of file X86IndirectThunks.cpp.