lld/test/ELF/arm-exidx-canunwind.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 %t -o %t2
   4 // RUN: llvm-objdump -d --triple=armv7a-none-linux-gnueabi --no-show-raw-insn %t2 | FileCheck %s
   5 // RUN: llvm-objdump -s --triple=armv7a-none-linux-gnueabi %t2 | FileCheck --check-prefix=CHECK-EXIDX %s
   6 // RUN: llvm-readobj --program-headers --sections %t2 | FileCheck -check-prefix=CHECK-PT %s
   7
   8 // Test that inline unwinding table entries and references to .ARM.extab
   9 // entries survive the re-ordering of the .ARM.exidx section
  10
  11  .syntax unified
  12  // Will produce an ARM.exidx entry with inline unwinding instructions
  13  .section .text.func1, "ax",%progbits
  14  .global func1
  15 func1:
  16  .fnstart
  17  bx lr
  18  .save {r7, lr}
  19  .setfp r7, sp, #0
  20  .fnend
  21
  22  // Unwinding instructions for .text2 too large for an inline entry ARM.exidx
  23  // entry. A separate .ARM.extab section is created to hold the unwind entries
  24  // The .ARM.exidx table entry has a reference to the .ARM.extab section.
  25  .section .text.func2, "ax",%progbits
  26  .global func2
  27 func2:
  28  .fnstart
  29  bx lr
  30  .personality __gxx_personality_v0
  31  .handlerdata
  32  .long 0
  33  .section .text.func2
  34  .fnend
  35
  36  // Dummy implementation of personality routines to satisfy reference from
  37  // exception tables
  38  .section .text.__gcc_personality_v0, "ax", %progbits
  39  .global __gxx_personality_v0
  40 __gxx_personality_v0:
  41  bx lr
  42
  43  .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
  44  .global __aeabi_unwind_cpp_pr0
  45 __aeabi_unwind_cpp_pr0:
  46  bx lr
  47
  48  .text
  49  .global _start
  50 _start:
  51  bl func1
  52  bl func2
  53  bx lr
  54
  55 // CHECK: Disassembly of section .text:
  56 // CHECK-EMPTY:
  57 // CHECK-NEXT: <_start>:
  58 // CHECK-NEXT:    20108:       bl      0x20114 <func1>
  59 // CHECK-NEXT:                 bl      0x20118 <func2>
  60 // CHECK-NEXT:                 bx      lr
  61 // CHECK:      <func1>:
  62 // CHECK-NEXT:    20114:       bx      lr
  63 // CHECK:      <func2>:
  64 // CHECK-NEXT:    20118:       bx      lr
  65 // CHECK:      <__gxx_personality_v0>:
  66 // CHECK-NEXT:    2011c:       bx      lr
  67 // CHECK:      <__aeabi_unwind_cpp_pr0>:
  68 // CHECK-NEXT:    20120:       bx      lr
  69
  70 /// 100d4 + 0x10034 = 0x20108 = main (linker generated cantunwind)
  71 /// 100dc + 0x10038 = 0x20114 = func1 (inline unwinding data)
  72 // CHECK-EXIDX:      100d4 34000100 01000000 38000100 08849780
  73 /// 100e4 + 0x10034 = 0x20118 = func2 (100e8 + 14 = 100fc = .ARM.extab entry)
  74 /// 100ec + 0x10030 = 0x2011c = __gxx_personality_v0 (linker generated cantunwind)
  75 // CHECK-EXIDX-NEXT: 100e4 34000100 14000000 30000100 01000000
  76 /// 100f4 + 0x10030 = 1101c = sentinel
  77 // CHECK-EXIDX-NEXT: 100f4 30000100 01000000
  78
  79 // CHECK-PT:          Name: .ARM.exidx
  80 // CHECK-PT-NEXT:     Type: SHT_ARM_EXIDX (0x70000001)
  81 // CHECK-PT-NEXT:     Flags [
  82 // CHECK-PT-NEXT:       SHF_ALLOC
  83 // CHECK-PT-NEXT:       SHF_LINK_ORDER
  84 // CHECK-PT-NEXT:     ]
  85 // CHECK-PT-NEXT:     Address: 0x100D4
  86 // CHECK-PT-NEXT:     Offset: 0xD4
  87 // CHECK-PT-NEXT:     Size: 40
  88
  89 // CHECK-PT:          Type: PT_ARM_EXIDX (0x70000001)
  90 // CHECK-PT-NEXT:     Offset: 0xD4
  91 // CHECK-PT-NEXT:     VirtualAddress: 0x100D4
  92 // CHECK-PT-NEXT:     PhysicalAddress: 0x100D4
  93 // CHECK-PT-NEXT:     FileSize: 40
  94 // CHECK-PT-NEXT:     MemSize: 40
  95 // CHECK-PT-NEXT:     Flags [ (0x4)
  96 // CHECK-PT-NEXT:       PF_R (0x4)
  97 // CHECK-PT-NEXT:     ]
  98 // CHECK-PT-NEXT:     Alignment: 4
  99 // CHECK-PT-NEXT:   }