lld/test/ELF/arm-fix-cortex-a8-blx.s

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -filetype=obj -triple=armv7a-linux-gnueabihf --arm-add-build-attributes %s -o %t.o
   3 // RUN: ld.lld --fix-cortex-a8 -verbose %t.o -o %t2 2>&1 | FileCheck %s
   4 // RUN: llvm-objdump -d --no-show-raw-insn --start-address=0x21ffa --stop-address=0x22008 %t2 | FileCheck --check-prefix=CHECK-PATCH %s
   5
   6 /// Test that the patch can work on an unrelocated BLX. Neither clang or GCC
   7 /// will emit these without a relocation, but they could be produced by ELF
   8 /// processing tools.
   9
  10 // CHECK: ld.lld: detected cortex-a8-657419 erratum sequence starting at 21FFE in unpatched output
  11
  12  .syntax unified
  13  .text
  14
  15  .type _start, %function
  16  .balign 4096
  17  .global _start
  18  .arm
  19 _start:
  20  bx lr
  21  .space 4086
  22  .thumb
  23 /// 32-bit Branch link and exchange spans 2 4KiB regions, preceded by a
  24 /// 32-bit non branch instruction. Expect a patch.
  25  nop.w
  26 /// Encoding for blx _start. Use .inst.n directives to avoid a relocation.
  27  .inst.n 0xf7ff
  28  .inst.n 0xe800
  29
  30 // CHECK-PATCH:         21ffa:          nop.w
  31 // CHECK-PATCH-NEXT:    21ffe:          blx     0x22004 <__CortexA8657417_21FFE>
  32 // CHECK-PATCH:      00022004 <__CortexA8657417_21FFE>:
  33 // CHECK-PATCH-NEXT:    22004:          b       0x21000 <_start>