1; RUN: llc -mtriple=x86_64-unknown-unknown -x86-indirect-branch-tracking < %s | FileCheck %s 2 3;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 4;; This test verify the handling of ''nocf_check'' attribute by the backend. ;; 5;; The file was generated using the following C code: ;; 6;; ;; 7;; void __attribute__((nocf_check)) NoCfCheckFunc(void) {} ;; 8;; ;; 9;; typedef void(*FuncPointer)(void); ;; 10;; void NoCfCheckCall(FuncPointer f) { ;; 11;; __attribute__((nocf_check)) FuncPointer p = f; ;; 12;; (*p)(); ;; 13;; } ;; 14;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 15 16; Make sure that a function with ''nocf_check'' attribute is not instrumented 17; with endbr instruction at the beginning. 18define void @NoCfCheckFunc() #0 { 19; CHECK-LABEL: NoCfCheckFunc 20; CHECK-NOT: endbr64 21; CHECK: retq 22entry: 23 ret void 24} 25 26; Make sure that notrack prefix is added before a call with ''nocf_check'' attribute. 27define void @NoCfCheckCall(void ()* %f) { 28; CHECK-LABEL: NoCfCheckCall 29; CHECK: notrack call 30entry: 31 %f.addr = alloca void ()*, align 4 32 %p = alloca void ()*, align 4 33 store void ()* %f, void ()** %f.addr, align 4 34 %0 = load void ()*, void ()** %f.addr, align 4 35 store void ()* %0, void ()** %p, align 4 36 %1 = load void ()*, void ()** %p, align 4 37 call void %1() #1 38 ret void 39} 40 41attributes #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" } 42attributes #1 = { nocf_check } 43 44!llvm.module.flags = !{!0} 45 46!0 = !{i32 4, !"cf-protection-branch", i32 1} 47