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[msan] Handle x86_sse_stmxcsr and x86_sse_ldmxcsr.

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llvm-svn: 296848
This commit is contained in:
Evgeniy Stepanov 2017-03-03 01:12:43 +00:00
parent 3e6024b68c
commit 73e0d6bf0e
2 changed files with 98 additions and 4 deletions
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50
lib/Transforms/Instrumentation/MemorySanitizer.cpp
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@ -1037,15 +1037,19 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
OriginMap[V] = Origin;
}
Constant *getCleanShadow(Type *OrigTy) {
Type *ShadowTy = getShadowTy(OrigTy);
if (!ShadowTy)
return nullptr;
return Constant::getNullValue(ShadowTy);
}
/// \brief Create a clean shadow value for a given value.
///
/// Clean shadow (all zeroes) means all bits of the value are defined
/// (initialized).
Constant *getCleanShadow(Value *V) {
Type *ShadowTy = getShadowTy(V);
if (!ShadowTy)
return nullptr;
return Constant::getNullValue(ShadowTy);
return getCleanShadow(V->getType());
}
/// \brief Create a dirty shadow of a given shadow type.
@ -2324,11 +2328,49 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
setOriginForNaryOp(I);
}
void handleStmxcsr(IntrinsicInst &I) {
IRBuilder<> IRB(&I);
Value* Addr = I.getArgOperand(0);
Type *Ty = IRB.getInt32Ty();
Value *ShadowPtr = getShadowPtr(Addr, Ty, IRB);
IRB.CreateStore(getCleanShadow(Ty),
IRB.CreatePointerCast(ShadowPtr, Ty->getPointerTo()));
if (ClCheckAccessAddress)
insertShadowCheck(Addr, &I);
}
void handleLdmxcsr(IntrinsicInst &I) {
if (!InsertChecks) return;
IRBuilder<> IRB(&I);
Value *Addr = I.getArgOperand(0);
Type *Ty = IRB.getInt32Ty();
unsigned Alignment = 1;
if (ClCheckAccessAddress)
insertShadowCheck(Addr, &I);
Value *Shadow = IRB.CreateAlignedLoad(getShadowPtr(Addr, Ty, IRB),
Alignment, "_ldmxcsr");
Value *Origin = MS.TrackOrigins
? IRB.CreateLoad(getOriginPtr(Addr, IRB, Alignment))
: getCleanOrigin();
insertShadowCheck(Shadow, Origin, &I);
}
void visitIntrinsicInst(IntrinsicInst &I) {
switch (I.getIntrinsicID()) {
case llvm::Intrinsic::bswap:
handleBswap(I);
break;
case llvm::Intrinsic::x86_sse_stmxcsr:
handleStmxcsr(I);
break;
case llvm::Intrinsic::x86_sse_ldmxcsr:
handleLdmxcsr(I);
break;
case llvm::Intrinsic::x86_avx512_vcvtsd2usi64:
case llvm::Intrinsic::x86_avx512_vcvtsd2usi32:
case llvm::Intrinsic::x86_avx512_vcvtss2usi64:

52
test/Instrumentation/MemorySanitizer/csr.ll Normal file
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@ -0,0 +1,52 @@
; RUN: opt < %s -msan -msan-check-access-address=0 -S | FileCheck %s
; RUN: opt < %s -msan -msan-check-access-address=1 -S | FileCheck %s --check-prefix=ADDR
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @llvm.x86.sse.stmxcsr(i8*)
declare void @llvm.x86.sse.ldmxcsr(i8*)
define void @getcsr(i32 *%p) sanitize_memory {
entry:
%0 = bitcast i32* %p to i8*
call void @llvm.x86.sse.stmxcsr(i8* %0)
ret void
}
; CHECK-LABEL: @getcsr(
; CHECK: store i32 0, i32*
; CHECK: call void @llvm.x86.sse.stmxcsr(
; CHECK: ret void
; ADDR-LABEL: @getcsr(
; ADDR: %[[A:.*]] = load i64, i64* getelementptr inbounds {{.*}} @__msan_param_tls, i32 0, i32 0), align 8
; ADDR: %[[B:.*]] = icmp ne i64 %[[A]], 0
; ADDR: br i1 %[[B]], label {{.*}}, label
; ADDR: call void @__msan_warning_noreturn()
; ADDR: call void @llvm.x86.sse.stmxcsr(
; ADDR: ret void
; Function Attrs: nounwind uwtable
define void @setcsr(i32 *%p) sanitize_memory {
entry:
%0 = bitcast i32* %p to i8*
call void @llvm.x86.sse.ldmxcsr(i8* %0)
ret void
}
; CHECK-LABEL: @setcsr(
; CHECK: %[[A:.*]] = load i32, i32* %{{.*}}, align 1
; CHECK: %[[B:.*]] = icmp ne i32 %[[A]], 0
; CHECK: br i1 %[[B]], label {{.*}}, label
; CHECK: call void @__msan_warning_noreturn()
; CHECK: call void @llvm.x86.sse.ldmxcsr(
; CHECK: ret void
; ADDR-LABEL: @setcsr(
; ADDR: %[[A:.*]] = load i64, i64* getelementptr inbounds {{.*}} @__msan_param_tls, i32 0, i32 0), align 8
; ADDR: %[[B:.*]] = icmp ne i64 %[[A]], 0
; ADDR: br i1 %[[B]], label {{.*}}, label
; ADDR: call void @__msan_warning_noreturn()
; ADDR: call void @llvm.x86.sse.ldmxcsr(
; ADDR: ret void