derek.holloway
7502bf64a4
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76 lines
3.6 KiB
LLVM
76 lines
3.6 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown -x86-indirect-branch-tracking < %s | FileCheck %s
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; This test verify the handling of ''nocf_check'' attribute by the backend. ;;
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;; The file was generated using the following C code: ;;
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;; ;;
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;; void __attribute__((nocf_check)) NoCfCheckFunc(void) {} ;;
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;; ;;
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;; typedef void(*FuncPointer)(void); ;;
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;; void NoCfCheckCall(FuncPointer f) { ;;
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;; __attribute__((nocf_check)) FuncPointer p = f; ;;
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;; (*p)(); ;;
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;; NoCfCheckFunc(); ;;
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;; } ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Make sure that a function with ''nocf_check'' attribute is not instrumented
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; with endbr instruction at the beginning.
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define void @NoCfCheckFunc() #0 {
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; CHECK-LABEL: NoCfCheckFunc
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; CHECK-NOT: endbr64
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; CHECK: retq
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entry:
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ret void
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}
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; Ensure the notrack prefix is added before an indirect call using a pointer
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; with ''nocf_check'' attribute. Also ensure a direct call to a function with
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; the ''nocf_check'' attribute is correctly generated without notrack prefix.
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define void @NoCfCheckCall(ptr %f) #1 {
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; CHECK-LABEL: NoCfCheckCall
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; CHECK: notrack call
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; CHECK: callq NoCfCheckFunc
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entry:
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%f.addr = alloca ptr, align 4
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%p = alloca ptr, align 4
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store ptr %f, ptr %f.addr, align 4
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%0 = load ptr, ptr %f.addr, align 4
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store ptr %0, ptr %p, align 4
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%1 = load ptr, ptr %p, align 4
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call void %1() #2
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call void @NoCfCheckFunc() #2
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ret void
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}
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;; NOTRACK tail call is not implemented, so nocf_check just disables tail call.
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define void @NoCfCheckTail(ptr %p) #1 {
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; CHECK-LABEL: NoCfCheckTail:
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; CHECK: notrack callq *%rax
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%f = load ptr, ptr %p, align 4
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tail call void %f() #2
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ret void
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}
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define void @NoCfCheckTailCond(ptr %f, i1 %x) #1 {
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; CHECK-LABEL: NoCfCheckTailCond:
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; CHECK: notrack callq *%rdi
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; CHECK: notrack callq *%rdi
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entry:
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br i1 %x, label %bb1, label %bb2
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bb1:
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tail call void %f() #2
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ret void
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bb2:
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tail call void %f() #2
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ret void
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}
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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" "use-soft-float"="false" }
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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" "use-soft-float"="false" }
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attributes #2 = { nocf_check }
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!llvm.module.flags = !{!0}
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!0 = !{i32 8, !"cf-protection-branch", i32 1}
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