xref: /llvm-project/llvm/test/CodeGen/AArch64/hwasan-zero-ptr.ll (revision 4f42e165164ba2bfca7b87be2a533ef09e8777e0) 
1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
2; RUN: llc -filetype asm -o - %s | FileCheck %s
3
4; This shows that CodeGen for AArch64 will elide the tag check when lowering
5; the HWASan memaccess intrinsic for null pointers.
6;
7; N.B. The HWASan pass will normally omit the memaccess intrinsic if the
8;      pointer is already statically known to be null.
9;
10; The source was generated from llvm/test/Instrumentation/HWAddressSanitizer/zero-ptr.ll
11; with the memaccess deliberately retained.
12
13; ModuleID = '<stdin>'
14source_filename = "<stdin>"
15target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
16target triple = "aarch64--linux-android10000"
17
18$hwasan.module_ctor = comdat any
19
20@__start_hwasan_globals = external hidden constant [0 x i8]
21@__stop_hwasan_globals = external hidden constant [0 x i8]
22@hwasan.note = private constant { i32, i32, i32, [8 x i8], i32, i32 } { i32 8, i32 8, i32 3, [8 x i8] c"LLVM\00\00\00\00", i32 trunc (i64 sub (i64 ptrtoint (ptr @__start_hwasan_globals to i64), i64 ptrtoint (ptr @hwasan.note to i64)) to i32), i32 trunc (i64 sub (i64 ptrtoint (ptr @__stop_hwasan_globals to i64), i64 ptrtoint (ptr @hwasan.note to i64)) to i32) }, section ".note.hwasan.globals", comdat($hwasan.module_ctor), align 4
23
24; Function Attrs: sanitize_hwaddress
25define void @test_store_to_zeroptr() #0 {
26; CHECK-LABEL: test_store_to_zeroptr:
27; CHECK:       // %bb.0: // %entry
28; CHECK-NEXT:    str x30, [sp, #-16]! // 8-byte Folded Spill
29; CHECK-NEXT:    .cfi_def_cfa_offset 16
30; CHECK-NEXT:    .cfi_offset w30, -16
31; CHECK-NEXT:    mov x8, xzr
32; CHECK-NEXT:    mov w9, #42 // =0x2a
33; CHECK-NEXT:    str x9, [x8]
34; CHECK-NEXT:    ldr x30, [sp], #16 // 8-byte Folded Reload
35; CHECK-NEXT:    ret
36entry:
37  %.hwasan.shadow = call ptr asm "", "=r,0"(ptr null)
38  %b = inttoptr i64 0 to ptr
39  call void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr %b, i32 19, i64 0)
40  store i64 42, ptr %b, align 8
41  ret void
42}
43
44; Function Attrs: nounwind
45declare void @llvm.hwasan.check.memaccess.shortgranules.fixedshadow(ptr, i32 immarg, i64 immarg) #1
46
47attributes #0 = { sanitize_hwaddress }
48attributes #1 = { nounwind }
49
50declare void @__hwasan_init()
51
52; Function Attrs: nounwind
53define internal void @hwasan.module_ctor() #1 comdat {
54; CHECK-LABEL: hwasan.module_ctor:
55; CHECK:       // %bb.0:
56; CHECK-NEXT:    str x30, [sp, #-16]! // 8-byte Folded Spill
57; CHECK-NEXT:    bl __hwasan_init
58; CHECK-NEXT:    ldr x30, [sp], #16 // 8-byte Folded Reload
59; CHECK-NEXT:    ret
60  call void @__hwasan_init()
61  ret void
62}
63
64!llvm.module.flags = !{!1}
65
66!0 = !{ptr @hwasan.note}
67!1 = !{i32 4, !"nosanitize_hwaddress", i32 1}
68