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adf3765c0d
CET-IBT enabled Return-twice functions will indirectly jump after the caller's position. So when CET-IBT is enable, we should make sure these is endbr* instructions follow these Return-twice function caller. Like GCC does. Patch by Xiang Zhang (xiangzhangllvm) Differential Revision: https://reviews.llvm.org/D61881 llvm-svn: 361342
77 lines
2.5 KiB
LLVM
77 lines
2.5 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown < %s | FileCheck %s --check-prefix=X64
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; RUN: llc -mtriple=i386-unknown-unknown < %s | FileCheck %s --check-prefix=X86
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; foo
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;; -----
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;; Checks ENDBR insertion after return twice functions.
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;; setjmp, sigsetjmp, savectx, vfork, getcontext
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;; setzx is not return twice function, should not followed by endbr.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; X64: callq setjmp
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; X64-NEXT: endbr64
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; X64: callq setzx
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; X64-NEXT: xorl
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; X64: callq sigsetjmp
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; X64-NEXT: endbr64
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; X64: callq savectx
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; X64-NEXT: endbr64
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; X64: callq vfork
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; X64-NEXT: endbr64
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; X64: callq getcontext
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; X64-NEXT: endbr64
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; X86: calll setjmp
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; X86-NEXT: endbr32
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; X86: calll setzx
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; X86-NEXT: xorl
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; X86: calll sigsetjmp
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; X86-NEXT: endbr32
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; X86: calll savectx
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; X86-NEXT: endbr32
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; X86: calll vfork
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; X86-NEXT: endbr32
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; X86: calll getcontext
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; X86-NEXT: endbr32
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; Function Attrs: noinline nounwind optnone uwtable
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define dso_local void @foo() #0 {
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entry:
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%call = call i32 (i32, ...) bitcast (i32 (...)* @setjmp to i32 (i32, ...)*)(i32 0) #1
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%call1 = call i32 (i32, ...) bitcast (i32 (...)* @setzx to i32 (i32, ...)*)(i32 0)
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%call2 = call i32 (i32, ...) bitcast (i32 (...)* @sigsetjmp to i32 (i32, ...)*)(i32 0) #1
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%call3 = call i32 (i32, ...) bitcast (i32 (...)* @setzx to i32 (i32, ...)*)(i32 0)
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%call4 = call i32 (i32, ...) bitcast (i32 (...)* @savectx to i32 (i32, ...)*)(i32 0) #1
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%call5 = call i32 @vfork() #1
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%call6 = call i32 (i32, ...) bitcast (i32 (...)* @setzx to i32 (i32, ...)*)(i32 0)
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%call7 = call i32 (i32, ...) bitcast (i32 (...)* @getcontext to i32 (i32, ...)*)(i32 0) #1
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ret void
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}
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; Function Attrs: returns_twice
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declare dso_local i32 @setjmp(...) #1
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declare dso_local i32 @setzx(...)
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; Function Attrs: returns_twice
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declare dso_local i32 @sigsetjmp(...) #1
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; Function Attrs: returns_twice
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declare dso_local i32 @savectx(...) #1
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; Function Attrs: returns_twice
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declare dso_local i32 @vfork() #1
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; Function Attrs: returns_twice
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declare dso_local i32 @getcontext(...) #1
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attributes #0 = { noinline nounwind optnone uwtable }
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attributes #1 = { returns_twice }
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!llvm.module.flags = !{!0, !1, !2}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 4, !"cf-protection-return", i32 1}
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!2 = !{i32 4, !"cf-protection-branch", i32 1}
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