1 # RUN: llc -verify-machineinstrs -mtriple=aarch64-none-linux-gnu \
2 # RUN: -start-before aarch64-sls-hardening \
3 # RUN: -stop-after aarch64-sls-hardening -o - %s \
4 # RUN: | FileCheck %s --check-prefixes=CHECK
6 # Check that the BLR SLS hardening transforms a BLR into a BL with operands as
9 $__llvm_slsblr_thunk_x8 = comdat any
10 @a = dso_local local_unnamed_addr global i32 (...)* null, align 8
11 @b = dso_local local_unnamed_addr global i32 0, align 4
13 define dso_local void @fn1() local_unnamed_addr "target-features"="+harden-sls-blr" {
15 %0 = load i32 ()*, i32 ()** bitcast (i32 (...)** @a to i32 ()**), align 8
16 %call = tail call i32 %0() nounwind
17 store i32 %call, i32* @b, align 4
21 ; Function Attrs: naked nounwind
22 define linkonce_odr hidden void @__llvm_slsblr_thunk_x8() naked nounwind comdat {
29 tracksRegLiveness: true
31 ; CHECK-LABEL: name: fn1
35 early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 ; :: (store (s64) into %stack.0)
36 frame-setup CFI_INSTRUCTION def_cfa_offset 16
37 frame-setup CFI_INSTRUCTION offset $w30, -16
38 renamable $x8 = ADRP target-flags(aarch64-page) @a
39 renamable $x8 = LDRXui killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @a :: (dereferenceable load (s64) from `i32 ()** bitcast (i32 (...)** @a to i32 ()**)`)
40 BLRNoIP killed renamable $x8, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $w0
41 ; 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
42 renamable $x8 = ADRP target-flags(aarch64-page) @b
43 STRWui killed renamable $w0, killed renamable $x8, target-flags(aarch64-pageoff, aarch64-nc) @b :: (store (s32) into @b)
44 early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 ; :: (load (s64) from %stack.0)
50 name: __llvm_slsblr_thunk_x8
51 tracksRegLiveness: true
57 SpeculationBarrierISBDSBEndBB