lld/test/ELF/arm-exidx-emit-relocs.s

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -filetype=obj --arm-add-build-attributes -triple=armv7a-none-linux-gnueabi %s -o %t
   3 // RUN: ld.lld --emit-relocs %t -o %t2
   4 // RUN: llvm-objdump -s --triple=armv7a-none-linux-gnueabi %t2 | FileCheck %s
   5 // RUN: llvm-readelf --relocs %t2 | FileCheck -check-prefix=CHECK-RELOCS %s
   6
   7 /// LLD does not support --emit-relocs for .ARM.exidx sections as the relocations
   8 /// from synthetic table entries won't be represented. Given the known use cases
   9 /// of --emit-relocs, relocating kernels, and binary analysis, the former doesn't
  10 /// use exceptions and the latter can derive the relocations from the table if
  11 /// they need them.
  12  .syntax unified
  13  /// Will produce an ARM.exidx entry with inline unwinding instructions
  14  .section .text.func1, "ax",%progbits
  15  .global func1
  16 func1:
  17  .fnstart
  18  bx lr
  19  .save {r7, lr}
  20  .setfp r7, sp, #0
  21  .fnend
  22
  23  .syntax unified
  24  .section .text.func2, "ax",%progbits
  25 /// A function with the same inline unwinding instructions, expect merge.
  26  .global func2
  27 func2:
  28  .fnstart
  29  bx lr
  30  .save {r7, lr}
  31  .setfp r7, sp, #0
  32  .fnend
  33
  34  .section .text.25, "ax", %progbits
  35  .global func25
  36 func25:
  37         .fnstart
  38         bx lr
  39         .cantunwind
  40         .fnend
  41
  42  .section .text.26, "ax", %progbits
  43  .global func26
  44 func26:
  45         .fnstart
  46         bx lr
  47         .cantunwind
  48         .fnend
  49
  50  .syntax unified
  51  .section .text.func3, "ax",%progbits
  52 /// A function with the same inline unwinding instructions, expect merge.
  53  .global func3
  54 func3:
  55  .fnstart
  56  bx lr
  57  .save {r7, lr}
  58  .setfp r7, sp, #0
  59  .fnend
  60
  61  .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
  62  .global __aeabi_unwind_cpp_pr0
  63 __aeabi_unwind_cpp_pr0:
  64  bx lr
  65
  66 // CHECK: Contents of section .ARM.exidx:
  67 // CHECK-NEXT:  100d4 28000100 08849780 28000100 01000000
  68 // CHECK-NEXT:  100e4 28000100 08849780 24000100 01000000
  69 // CHECK-NEXT:  100f4 20000100 01000000
  70
  71 // CHECK-RELOCS-NOT: Relocation section '.rel.ARM.exidx'