1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
; RUN: llc -mtriple=x86_64-unknown-unknown -x86-indirect-branch-tracking < %s | FileCheck %s
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; This test verify the handling of ''nocf_check'' attribute by the backend. ;;
;; The file was generated using the following C code: ;;
;; ;;
;; void __attribute__((nocf_check)) NoCfCheckFunc(void) {} ;;
;; ;;
;; typedef void(*FuncPointer)(void); ;;
;; void NoCfCheckCall(FuncPointer f) { ;;
;; __attribute__((nocf_check)) FuncPointer p = f; ;;
;; (*p)(); ;;
;; } ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Make sure that a function with ''nocf_check'' attribute is not instrumented
; with endbr instruction at the beginning.
define void @NoCfCheckFunc() #0 {
; CHECK-LABEL: NoCfCheckFunc
; CHECK-NOT: endbr64
; CHECK: retq
entry:
ret void
}
; Make sure that notrack prefix is added before a call with ''nocf_check'' attribute.
define void @NoCfCheckCall(void ()* %f) {
; CHECK-LABEL: NoCfCheckCall
; CHECK: notrack call
entry:
%f.addr = alloca void ()*, align 4
%p = alloca void ()*, align 4
store void ()* %f, void ()** %f.addr, align 4
%0 = load void ()*, void ()** %f.addr, align 4
store void ()* %0, void ()** %p, align 4
%1 = load void ()*, void ()** %p, align 4
call void %1() #1
ret void
}
attributes #0 = { noinline nocf_check nounwind optnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nocf_check }
!llvm.module.flags = !{!0}
!0 = !{i32 4, !"cf-protection-branch", i32 1}
|
