[hwasan] Optimize outlined memaccess for fixed shadow on Aarch64 (#88544)

The HWASan transform currently always uses x20 to pass the shadow base to hwasan_check_memaccess_shortgranules, even if the shadow base is a constant known at compile time (e.g., for Fuchsia, KHWASan, or via -hwasan-mapping-offset).  This patch uses the fixed shadow variant of the hwasan_check_memaccess_shortgranules intrinsic (introduced in 365bddf), allowing the shadow base to be materialized inside the memaccess callee.

We currently only support this optimization for AArch64; it is a no-op on other platforms due to lack of support for lowering the intrinsic.

Note: when a binary is instrumented with -hwasan-mapping-offset, it is necessary to specify HWASAN_OPTIONS=fixed_shadow_base=... (see ea991a1) at runtime to ensure the shadow is mapped appropriately.

Author: thurstond

llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

@@ -930,11 +930,33 @@ void HWAddressSanitizer::instrumentMemAccessOutline(Value *Ptr, bool IsWrite,
 
   IRBuilder<> IRB(InsertBefore);
   Module *M = IRB.GetInsertBlock()->getParent()->getParent();
-  IRB.CreateCall(Intrinsic::getDeclaration(
-                     M, UseShortGranules
-                            ? Intrinsic::hwasan_check_memaccess_shortgranules
-                            : Intrinsic::hwasan_check_memaccess),
-                 {ShadowBase, Ptr, ConstantInt::get(Int32Ty, AccessInfo)});
+  bool useFixedShadowIntrinsic = false;
+  // The memaccess fixed shadow intrinsic is only supported on AArch64,
+  // which allows a 16-bit immediate to be left-shifted by 32.
+  // Since kShadowBaseAlignment == 32, and Linux by default will not
+  // mmap above 48-bits, practically any valid shadow offset is
+  // representable.
+  // In particular, an offset of 4TB (1024 << 32) is representable, and
+  // ought to be good enough for anybody.
+  if (TargetTriple.isAArch64() && Mapping.Offset != kDynamicShadowSentinel) {
+    uint16_t offset_shifted = Mapping.Offset >> 32;
+    useFixedShadowIntrinsic = (uint64_t)offset_shifted << 32 == Mapping.Offset;
+  }
+
+  if (useFixedShadowIntrinsic)
+    IRB.CreateCall(
+        Intrinsic::getDeclaration(
+            M, UseShortGranules
+                   ? Intrinsic::hwasan_check_memaccess_shortgranules_fixedshadow
+                   : Intrinsic::hwasan_check_memaccess_fixedshadow),
+        {Ptr, ConstantInt::get(Int32Ty, AccessInfo),
+         ConstantInt::get(Int64Ty, Mapping.Offset)});
+  else
+    IRB.CreateCall(Intrinsic::getDeclaration(
+                       M, UseShortGranules
+                              ? Intrinsic::hwasan_check_memaccess_shortgranules
+                              : Intrinsic::hwasan_check_memaccess),
+                   {ShadowBase, Ptr, ConstantInt::get(Int32Ty, AccessInfo)});
 }
 
 void HWAddressSanitizer::instrumentMemAccessInline(Value *Ptr, bool IsWrite,

llvm/test/Instrumentation/HWAddressSanitizer/basic.ll

@@ -9,8 +9,6 @@
 ; RUN: opt < %s -passes=hwasan -hwasan-recover=0 -hwasan-mapping-offset=0 -S | FileCheck %s --check-prefixes=ABORT-ZERO-BASED-SHADOW
 ; RUN: opt < %s -passes=hwasan -hwasan-recover=1 -hwasan-mapping-offset=0 -S | FileCheck %s --check-prefixes=RECOVER-ZERO-BASED-SHADOW
 
-; CHECK: @llvm.used = appending global [1 x ptr] [ptr @hwasan.module_ctor]
-; CHECK: @llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 0, ptr @hwasan.module_ctor, ptr @hwasan.module_ctor }]
 
 target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
 target triple = "aarch64--linux-android10000"
@@ -101,7 +99,7 @@ define i8 @test_load8(ptr %a) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]]) #[[ATTR0:[0-9]+]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 0)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 0, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[B:%.*]] = load i8, ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret i8 [[B]]
 ;
@@ -233,7 +231,7 @@ define i16 @test_load16(ptr %a) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 1)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 1, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[B:%.*]] = load i16, ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret i16 [[B]]
 ;
@@ -365,7 +363,7 @@ define i32 @test_load32(ptr %a) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 2)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 2, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[B:%.*]] = load i32, ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret i32 [[B]]
 ;
@@ -497,7 +495,7 @@ define i64 @test_load64(ptr %a) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 3)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 3, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[B:%.*]] = load i64, ptr [[A]], align 8
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret i64 [[B]]
 ;
@@ -629,7 +627,7 @@ define i128 @test_load128(ptr %a) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 4)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 4, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[B:%.*]] = load i128, ptr [[A]], align 16
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret i128 [[B]]
 ;
@@ -830,7 +828,7 @@ define void @test_store8(ptr %a, i8 %b) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]], i8 [[B:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 16)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 16, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    store i8 [[B]], ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret void
 ;
@@ -962,7 +960,7 @@ define void @test_store16(ptr %a, i16 %b) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]], i16 [[B:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 17)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 17, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    store i16 [[B]], ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret void
 ;
@@ -1094,7 +1092,7 @@ define void @test_store32(ptr %a, i32 %b) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]], i32 [[B:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 18)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 18, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    store i32 [[B]], ptr [[A]], align 4
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret void
 ;
@@ -1226,7 +1224,7 @@ define void @test_store64(ptr %a, i64 %b) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]], i64 [[B:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 19)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 19, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    store i64 [[B]], ptr [[A]], align 8
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret void
 ;
@@ -1358,7 +1356,7 @@ define void @test_store128(ptr %a, i128 %b) sanitize_hwaddress {
 ; ABORT-ZERO-BASED-SHADOW-SAME: (ptr [[A:%.*]], i128 [[B:%.*]]) #[[ATTR0]] {
 ; ABORT-ZERO-BASED-SHADOW-NEXT:  entry:
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 20)
+; ABORT-ZERO-BASED-SHADOW-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 20, i64 0)
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    store i128 [[B]], ptr [[A]], align 16
 ; ABORT-ZERO-BASED-SHADOW-NEXT:    ret void
 ;

llvm/test/Instrumentation/HWAddressSanitizer/fixed-shadow.ll

@@ -12,7 +12,7 @@ define i8 @test_load8(ptr %a) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0:[0-9]+]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 0)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 0, i64 4398046511104)
 ; CHECK-NEXT:    [[B:%.*]] = load i8, ptr [[A]], align 4
 ; CHECK-NEXT:    ret i8 [[B]]
 ;
@@ -26,7 +26,7 @@ define i16 @test_load16(ptr %a) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 1)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 1, i64 4398046511104)
 ; CHECK-NEXT:    [[B:%.*]] = load i16, ptr [[A]], align 4
 ; CHECK-NEXT:    ret i16 [[B]]
 ;
@@ -40,7 +40,7 @@ define i32 @test_load32(ptr %a) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 2)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 2, i64 4398046511104)
 ; CHECK-NEXT:    [[B:%.*]] = load i32, ptr [[A]], align 4
 ; CHECK-NEXT:    ret i32 [[B]]
 ;
@@ -54,7 +54,7 @@ define i64 @test_load64(ptr %a) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 3)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 3, i64 4398046511104)
 ; CHECK-NEXT:    [[B:%.*]] = load i64, ptr [[A]], align 8
 ; CHECK-NEXT:    ret i64 [[B]]
 ;
@@ -68,7 +68,7 @@ define i128 @test_load128(ptr %a) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 4)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 4, i64 4398046511104)
 ; CHECK-NEXT:    [[B:%.*]] = load i128, ptr [[A]], align 16
 ; CHECK-NEXT:    ret i128 [[B]]
 ;
@@ -97,7 +97,7 @@ define void @test_store8(ptr %a, i8 %b) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]], i8 [[B:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 16)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 16, i64 4398046511104)
 ; CHECK-NEXT:    store i8 [[B]], ptr [[A]], align 4
 ; CHECK-NEXT:    ret void
 ;
@@ -111,7 +111,7 @@ define void @test_store16(ptr %a, i16 %b) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]], i16 [[B:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 17)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 17, i64 4398046511104)
 ; CHECK-NEXT:    store i16 [[B]], ptr [[A]], align 4
 ; CHECK-NEXT:    ret void
 ;
@@ -125,7 +125,7 @@ define void @test_store32(ptr %a, i32 %b) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]], i32 [[B:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 18)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 18, i64 4398046511104)
 ; CHECK-NEXT:    store i32 [[B]], ptr [[A]], align 4
 ; CHECK-NEXT:    ret void
 ;
@@ -139,7 +139,7 @@ define void @test_store64(ptr %a, i64 %b) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]], i64 [[B:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 19)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 19, i64 4398046511104)
 ; CHECK-NEXT:    store i64 [[B]], ptr [[A]], align 8
 ; CHECK-NEXT:    ret void
 ;
@@ -153,7 +153,7 @@ define void @test_store128(ptr %a, i128 %b) sanitize_hwaddress {
 ; CHECK-SAME: (ptr [[A:%.*]], i128 [[B:%.*]]) #[[ATTR0]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr inttoptr (i64 4398046511104 to ptr))
-; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 20)
+; CHECK-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 20, i64 4398046511104)
 ; CHECK-NEXT:    store i128 [[B]], ptr [[A]], align 16
 ; CHECK-NEXT:    ret void
 ;

llvm/test/Instrumentation/HWAddressSanitizer/prologue.ll

@@ -69,15 +69,15 @@ define i32 @test_load(ptr %a) sanitize_hwaddress {
 ; FUCHSIA-SAME: (ptr [[A:%.*]]) #[[ATTR0:[0-9]+]] {
 ; FUCHSIA-NEXT:  entry:
 ; FUCHSIA-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; FUCHSIA-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 2)
+; FUCHSIA-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 2, i64 0)
 ; FUCHSIA-NEXT:    [[X:%.*]] = load i32, ptr [[A]], align 4
 ; FUCHSIA-NEXT:    ret i32 [[X]]
 ;
 ; FUCHSIA-LIBCALL-LABEL: define i32 @test_load
 ; FUCHSIA-LIBCALL-SAME: (ptr [[A:%.*]]) #[[ATTR0:[0-9]+]] {
 ; FUCHSIA-LIBCALL-NEXT:  entry:
 ; FUCHSIA-LIBCALL-NEXT:    [[DOTHWASAN_SHADOW:%.*]] = call ptr asm "", "=r,0"(ptr null)
-; FUCHSIA-LIBCALL-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules(ptr [[DOTHWASAN_SHADOW]], ptr [[A]], i32 2)
+; FUCHSIA-LIBCALL-NEXT:    call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr [[A]], i32 2, i64 0)
 ; FUCHSIA-LIBCALL-NEXT:    [[X:%.*]] = load i32, ptr [[A]], align 4
 ; FUCHSIA-LIBCALL-NEXT:    ret i32 [[X]]
 ;