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# RUN: llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu \
# RUN: -start-before aarch64-sls-hardening \
# RUN: -stop-after aarch64-sls-hardening -o - %s \
# RUN: | FileCheck %s --check-prefixes=CHECK
# Check that the BLR SLS hardening transforms a BLR into a BL with operands as
# expected.
--- |
$__llvm_slsblr_thunk_x8 = comdat any
@a = dso_local local_unnamed_addr global i32 (...)* null, align 8
@b = dso_local local_unnamed_addr global i32 0, align 4
define dso_local void @fn1() local_unnamed_addr "target-features"="+harden-sls-blr" {
entry:
%0 = load i32 ()*, i32 ()** bitcast (i32 (...)** @a to i32 ()**), align 8
%call = tail call i32 %0() nounwind
store i32 %call, i32* @b, align 4
ret void
}
; Function Attrs: naked nounwind
define linkonce_odr hidden void @__llvm_slsblr_thunk_x8() naked nounwind comdat {
entry:
ret void
}
...
---
name: fn1
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: fn1
bb.0.entry:
liveins: $lr
early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 ; :: (store 8 into %stack.0)
frame-setup CFI_INSTRUCTION def_cfa_offset 16
frame-setup CFI_INSTRUCTION offset $w30, -16
renamable $x8 = ADRP target-flags(aarch64-page) @a
renamable $x8 = LDRXui killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @a :: (dereferenceable load 8 from `i32 ()** bitcast (i32 (...)** @a to i32 ()**)`)
BLRNoIP killed renamable $x8, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $w0
; 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
renamable $x8 = ADRP target-flags(aarch64-page) @b
STRWui killed renamable $w0, killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @b :: (store 4 into @b)
early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 ; :: (load 8 from %stack.0)
RET undef $lr
...
---
name: __llvm_slsblr_thunk_x8
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x8
BR $x8
SpeculationBarrierISBDSBEndBB
...
|
