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; 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)(); ;;
;; NoCfCheckFunc(); ;;
;; } ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; 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
}
; Ensure the notrack prefix is added before an indirect call using a pointer
; with ''nocf_check'' attribute. Also ensure a direct call to a function with
; the ''nocf_check'' attribute is correctly generated without notrack prefix.
define void @NoCfCheckCall(ptr %f) #1 {
; CHECK-LABEL: NoCfCheckCall
; CHECK: notrack call
; CHECK: callq NoCfCheckFunc
entry:
%f.addr = alloca ptr, align 4
%p = alloca ptr, align 4
store ptr %f, ptr %f.addr, align 4
%0 = load ptr, ptr %f.addr, align 4
store ptr %0, ptr %p, align 4
%1 = load ptr, ptr %p, align 4
call void %1() #2
call void @NoCfCheckFunc() #2
ret void
}
attributes #0 = { nocf_check noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { noinline nounwind optnone uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nocf_check }
!llvm.module.flags = !{!0}
!0 = !{i32 8, !"cf-protection-branch", i32 1}
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