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 5 6# Check that the BLR SLS hardening transforms a BLR into a BL with operands as 7# expected. 8--- | 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 12 13 define dso_local void @fn1() local_unnamed_addr "target-features"="+harden-sls-blr" { 14 entry: 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 18 ret void 19 } 20 21 ; Function Attrs: naked nounwind 22 define linkonce_odr hidden void @__llvm_slsblr_thunk_x8() naked nounwind comdat { 23 entry: 24 ret void 25 } 26... 27--- 28name: fn1 29tracksRegLiveness: true 30body: | 31 ; CHECK-LABEL: name: fn1 32 bb.0.entry: 33 liveins: $lr 34 35 early-clobber $sp = frame-setup STRXpre killed $lr, $sp, -16 ; :: (store 8 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 8 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 4 into @b) 44 early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 ; :: (load 8 from %stack.0) 45 RET undef $lr 46 47 48... 49--- 50name: __llvm_slsblr_thunk_x8 51tracksRegLiveness: true 52body: | 53 bb.0.entry: 54 liveins: $x8 55 56 BR $x8 57 SpeculationBarrierISBDSBEndBB 58... 59