derek.holloway
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60 lines
2.4 KiB
YAML
60 lines
2.4 KiB
YAML
# RUN: llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu \
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# RUN: -start-before aarch64-sls-hardening \
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# RUN: -stop-after aarch64-sls-hardening -o - %s \
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# RUN: | FileCheck %s --check-prefixes=CHECK \
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# RUN: --implicit-check-not=__llvm_slsblr_thunk_x7
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# RUN: llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu \
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# RUN: -start-before aarch64-sls-hardening \
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# RUN: -asm-verbose=0 -o - %s \
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# RUN: | FileCheck %s --check-prefixes=ASM \
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# RUN: --implicit-check-not=__llvm_slsblr_thunk_x7
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# Check that the BLR SLS hardening transforms a BLR into a BL with operands as
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# expected.
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--- |
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@a = dso_local local_unnamed_addr global ptr null, align 8
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@b = dso_local local_unnamed_addr global i32 0, align 4
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define dso_local void @fn1() local_unnamed_addr "target-features"="+harden-sls-blr" {
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entry:
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%0 = load ptr, ptr @a, align 8
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%call = tail call i32 %0() nounwind
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store i32 %call, ptr @b, align 4
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ret void
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}
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...
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---
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name: fn1
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tracksRegLiveness: true
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body: |
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; CHECK-LABEL: name: fn1
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bb.0.entry:
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liveins: $lr
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early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 ; :: (store (s64) into %stack.0)
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frame-setup CFI_INSTRUCTION def_cfa_offset 16
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frame-setup CFI_INSTRUCTION offset $w30, -16
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renamable $x8 = ADRP target-flags(aarch64-page) @a
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renamable $x8 = LDRXui killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @a :: (dereferenceable load (s64) from `ptr bitcast (ptr @a to ptr)`)
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BLRNoIP killed renamable $x8, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $w0
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; CHECK: BL <mcsymbol __llvm_slsblr_thunk_x8>, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $w0, implicit killed $x8
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renamable $x8 = ADRP target-flags(aarch64-page) @b
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STRWui killed renamable $w0, killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @b :: (store (s32) into @b)
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early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 ; :: (load (s64) from %stack.0)
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RET undef $lr
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...
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# CHECK: name: __llvm_slsblr_thunk_x8
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#
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# CHECK: $x16 = ORRXrs $xzr, $x8, 0
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# CHECK-NEXT: BR $x16
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# CHECK-NEXT: SpeculationBarrierISBDSBEndBB
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# ASM-LABEL: __llvm_slsblr_thunk_x8:
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# ASM-NEXT: mov x16, x8
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# ASM-NEXT: br x16
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# ASM-NEXT: dsb sy
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# ASM-NEXT: isb
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