5c54742da4
This patch aims to match the changes introduced in gcc by https://gcc.gnu.org/ml/gcc-cvs/2018-04/msg00534.html. The IBT feature definition is removed, with the IBT instructions being freely available on all X86 targets. The shadow stack instructions are also being made freely available, and the use of all these CET instructions is controlled by the module flags derived from the -fcf-protection clang option. The hasSHSTK option remains since clang uses it to determine availability of shadow stack instruction intrinsics, but it is no longer directly used. Comes with a clang patch (D46881). Patch by mike.dvoretsky Differential Revision: https://reviews.llvm.org/D46882 llvm-svn: 332705
47 lines
2.3 KiB
LLVM
47 lines
2.3 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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;; } ;;
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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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; Make sure that notrack prefix is added before a call with ''nocf_check'' attribute.
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define void @NoCfCheckCall(void ()* %f) {
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; CHECK-LABEL: NoCfCheckCall
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; CHECK: notrack call
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entry:
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%f.addr = alloca void ()*, align 4
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%p = alloca void ()*, align 4
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store void ()* %f, void ()** %f.addr, align 4
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%0 = load void ()*, void ()** %f.addr, align 4
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store void ()* %0, void ()** %p, align 4
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%1 = load void ()*, void ()** %p, align 4
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call void %1() #1
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ret void
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}
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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" }
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attributes #1 = { nocf_check }
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!llvm.module.flags = !{!0}
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!0 = !{i32 4, !"cf-protection-branch", i32 1}
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