[ARM] Add support for MSVC stack cookie checking

Heavily based on the same for AArch64, from SVN r346469.

Differential Revision: https://reviews.llvm.org/D64292

llvm-svn: 365283
This commit is contained in:
Martin Storsjo 2019-07-07 18:57:31 +00:00
parent 842f55f3ef
commit 8d9d290d4c
3 changed files with 54 additions and 0 deletions

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@ -15237,6 +15237,36 @@ bool ARMTargetLowering::useLoadStackGuardNode() const {
return Subtarget->isTargetMachO();
}
void ARMTargetLowering::insertSSPDeclarations(Module &M) const {
if (!Subtarget->getTargetTriple().isWindowsMSVCEnvironment())
return TargetLowering::insertSSPDeclarations(M);
// MSVC CRT has a global variable holding security cookie.
M.getOrInsertGlobal("__security_cookie",
Type::getInt8PtrTy(M.getContext()));
// MSVC CRT has a function to validate security cookie.
FunctionCallee SecurityCheckCookie = M.getOrInsertFunction(
"__security_check_cookie", Type::getVoidTy(M.getContext()),
Type::getInt8PtrTy(M.getContext()));
if (Function *F = dyn_cast<Function>(SecurityCheckCookie.getCallee()))
F->addAttribute(1, Attribute::AttrKind::InReg);
}
Value *ARMTargetLowering::getSDagStackGuard(const Module &M) const {
// MSVC CRT has a global variable holding security cookie.
if (Subtarget->getTargetTriple().isWindowsMSVCEnvironment())
return M.getGlobalVariable("__security_cookie");
return TargetLowering::getSDagStackGuard(M);
}
Function *ARMTargetLowering::getSSPStackGuardCheck(const Module &M) const {
// MSVC CRT has a function to validate security cookie.
if (Subtarget->getTargetTriple().isWindowsMSVCEnvironment())
return M.getFunction("__security_check_cookie");
return TargetLowering::getSSPStackGuardCheck(M);
}
bool ARMTargetLowering::canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
unsigned &Cost) const {
// If we do not have NEON, vector types are not natively supported.

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@ -555,6 +555,10 @@ class VectorType;
bool useLoadStackGuardNode() const override;
void insertSSPDeclarations(Module &M) const override;
Value *getSDagStackGuard(const Module &M) const override;
Function *getSSPStackGuardCheck(const Module &M) const override;
bool canCombineStoreAndExtract(Type *VectorTy, Value *Idx,
unsigned &Cost) const override;

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@ -0,0 +1,20 @@
; RUN: llc -mtriple=thumbv7-windows-msvc < %s -o - | FileCheck --check-prefix=MSVC %s
; RUN: llc -mtriple=thumbv7-windows-msvc -O0 < %s -o - | FileCheck --check-prefix=MSVC %s
define void @_Z1fv() sspreq {
entry:
%x = alloca i32, align 4
%0 = bitcast i32* %x to i8*
call void @_Z7CapturePi(i32* nonnull %x)
ret void
}
declare void @_Z7CapturePi(i32*)
; MSVC: movw r0, :lower16:__security_cookie
; MSVC: movt r0, :upper16:__security_cookie
; MSVC: ldr r0, [r0]
; MSVC: str r0, [sp, #4]
; MSVC: bl _Z7CapturePi
; MSVC: ldr r0, [sp, #4]
; MSVC: bl __security_check_cookie