| # 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 (s64) 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 (s64) 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 (s32) into @b) |
| early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 16 ; :: (load (s64) from %stack.0) |
| RET undef $lr |
| |
| |
| ... |
| --- |
| name: __llvm_slsblr_thunk_x8 |
| tracksRegLiveness: true |
| body: | |
| bb.0.entry: |
| liveins: $x8 |
| |
| BR $x8 |
| SpeculationBarrierISBDSBEndBB |
| ... |