derek.holloway
7502bf64a4
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48 lines
1.9 KiB
LLVM
48 lines
1.9 KiB
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu %s -o - | FileCheck %s --check-prefixes=CHECK,NOBTI
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; RUN: llc -mtriple=aarch64-none-elf %s -o - | FileCheck %s --check-prefixes=CHECK,NOBTI
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; RUN: llc -mtriple=aarch64-none-macho %s -o - | FileCheck %s --check-prefixes=CHECK,BTI
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; RUN: llc -mtriple=aarch64-windows-msvc %s -o - | FileCheck %s --check-prefixes=CHECK,BTI
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;; This function has internal linkage, and nothing in this translation unit
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;; calls it indirectly. So it doesn't need a BTI at the start ... except that
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;; it might, if at link time if the linker inserts a long-branch thunk using a
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;; BLR instruction.
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;;
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;; For ELF targets, both Linux and bare-metal, we expect no BTI instruction at
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;; the start of the function, because AAELF64 specifies that it's not needed:
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;; if the linker wants to do that then it's responsible for making a 'landing
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;; pad' near the target function which _does_ have a BTI, and pointing the
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;; indirect call at that.
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;;
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;; But this is specified in AAELF64, so non-ELF targets can't rely on that
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;; guarantee, and we expect LLVM to insert the BTI anyway.
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define internal void @internal_linkage() "branch-target-enforcement" {
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; CHECK-LABEL: internal_linkage:
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; BTI: hint #34
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; NOBTI-NOT: hint #34
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; CHECK: ret
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entry:
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ret void
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}
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;; This function has internal linkage but _is_ potentially called indirectly
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;; (its address escapes from the module via external_linkage() below), so it
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;; needs a BTI irrespective of target triple.
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define internal void @indirectly_called() "branch-target-enforcement" {
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; CHECK-LABEL: indirectly_called:
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; CHECK: hint #34
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; CHECK: ret
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entry:
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ret void
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}
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;; This function has external linkage, so it needs a BTI in all circumstances.
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define ptr @external_linkage() "branch-target-enforcement" {
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; CHECK-LABEL: external_linkage:
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; CHECK: hint #34
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; CHECK: ret
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entry:
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call void @internal_linkage()
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ret ptr @indirectly_called
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}
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