derek.holloway
7502bf64a4
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108 lines
3.2 KiB
LLVM
108 lines
3.2 KiB
LLVM
; RUN: llc -mtriple=i686 %s -o - | FileCheck --check-prefixes=CHECK,X86 %s
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; RUN: llc -mtriple=x86_64 %s -o - | FileCheck --check-prefixes=CHECK,X64 %s
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;; -fpatchable-function-entry=0 -fcf-protection=branch
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define void @f0() "patchable-function-entry"="0" {
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; CHECK-LABEL: f0:
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; CHECK-NEXT: .Lfunc_begin0:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: # %bb.0:
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; X86-NEXT: endbr32
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; X64-NEXT: endbr64
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; CHECK-NEXT: ret
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; CHECK-NOT: .section __patchable_function_entries
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ret void
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}
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;; -fpatchable-function-entry=1 -fcf-protection=branch
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;; For M=0, place the label .Lpatch0 after the initial ENDBR.
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;; .cfi_startproc should be placed at the function entry.
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define void @f1() "patchable-function-entry"="1" {
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; CHECK-LABEL: f1:
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; CHECK-NEXT: .Lfunc_begin1:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: # %bb.0:
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; X86-NEXT: endbr32
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; X64-NEXT: endbr64
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; CHECK-NEXT: .Lpatch0:
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; CHECK-NEXT: nop
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; CHECK-NEXT: ret
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f1{{$}}
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; X86-NEXT: .p2align 2
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; X86-NEXT: .long .Lpatch0
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; X64-NEXT: .p2align 3
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; X64-NEXT: .quad .Lpatch0
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ret void
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}
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;; -fpatchable-function-entry=2,1 -fcf-protection=branch
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define void @f2_1() "patchable-function-entry"="1" "patchable-function-prefix"="1" {
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; CHECK-LABEL: .type f2_1,@function
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; CHECK-NEXT: .Ltmp0:
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; CHECK-NEXT: nop
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; CHECK-NEXT: f2_1:
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; CHECK-NEXT: .Lfunc_begin2:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: # %bb.0:
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; X86-NEXT: endbr32
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; X64-NEXT: endbr64
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; CHECK-NEXT: nop
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; CHECK-NEXT: ret
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; CHECK: .Lfunc_end2:
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; CHECK-NEXT: .size f2_1, .Lfunc_end2-f2_1
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f2_1{{$}}
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; X86-NEXT: .p2align 2
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; X86-NEXT: .long .Ltmp0
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; X64-NEXT: .p2align 3
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; X64-NEXT: .quad .Ltmp0
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ret void
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}
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;; -fpatchable-function-entry=1 -fcf-protection=branch
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;; For M=0, don't create .Lpatch0 if the initial instruction is not ENDBR,
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;; even if other basic blocks may have ENDBR.
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@buf = internal global [5 x ptr] zeroinitializer
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declare i32 @llvm.eh.sjlj.setjmp(ptr)
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define internal void @f1i() "patchable-function-entry"="1" {
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; CHECK-LABEL: f1i:
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; CHECK-NEXT: .Lfunc_begin3:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: # %bb.0:
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; CHECK-NEXT: nop
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; CHECK-NOT: .Lpatch0:
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;; Another basic block has ENDBR, but it doesn't affect our decision to not create .Lpatch0
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; CHECK: endbr
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; CHECK: .section __patchable_function_entries,"awo",@progbits,f1i{{$}}
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; X86-NEXT: .p2align 2
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; X86-NEXT: .long .Lfunc_begin3
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; X64-NEXT: .p2align 3
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; X64-NEXT: .quad .Lfunc_begin3
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entry:
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tail call i32 @llvm.eh.sjlj.setjmp(ptr @buf)
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ret void
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}
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;; Test the interaction with -fsanitize=function.
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; CHECK: .type sanitize_function,@function
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; CHECK-NEXT: .Ltmp{{.*}}:
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; CHECK-NEXT: nop
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; CHECK-NEXT: .long 3238382334
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; CHECK-NEXT: .long 42
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; CHECK-NEXT: sanitize_function:
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; CHECK-NEXT: .Lfunc_begin{{.*}}:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: # %bb.0:
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; X86-NEXT: endbr32
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; X64-NEXT: endbr64
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; CHECK-NEXT: nop
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; CHECK-NEXT: ret
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define void @sanitize_function(ptr noundef %x) "patchable-function-prefix"="1" "patchable-function-entry"="1" !func_sanitize !1 {
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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 8, !"cf-protection-branch", i32 1}
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!1 = !{i32 3238382334, i32 42}
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