lld/test/ELF/arm-exidx-add-missing.s

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -filetype=obj -triple=armv7a-none-linux-gnueabi --arm-add-build-attributes %s -o %t
   3 // RUN: ld.lld %t --no-merge-exidx-entries -o %t2
   4 // RUN: llvm-objdump -s %t2 | FileCheck %s
   5 // RUN: ld.lld %t -o %t3
   6 // RUN: llvm-objdump -s %t3 | FileCheck %s --check-prefix=CHECK-MERGE
   7
   8 /// The ARM.exidx section is a table of 8-byte entries of the form:
   9 /// | PREL31 Relocation to start of function | Unwinding information |
  10 /// The range of addresses covered by the table entry is terminated by the
  11 /// next table entry. This means that an executable section without a .ARM.exidx
  12 /// section does not terminate the range of addresses. To fix this the linker
  13 /// synthesises an EXIDX_CANTUNWIND entry for each section without a .ARM.exidx
  14 /// section.
  15
  16         .syntax unified
  17
  18         /// Expect inline unwind instructions
  19         .section .text.01, "ax", %progbits
  20         .global f1
  21 f1:
  22         .fnstart
  23         bx lr
  24         .save {r7, lr}
  25         .setfp r7, sp, #0
  26         .fnend
  27
  28         /// Expect no unwind information from assembler. The linker must
  29         /// synthesise an EXIDX_CANTUNWIND entry to prevent an exception
  30         /// thrown through f2 from matching against the unwind instructions
  31         /// for f1.
  32         .section .text.02, "ax", %progbits
  33         .global f2
  34 f2:
  35         bx lr
  36
  37
  38         /// Expect 1 EXIDX_CANTUNWIND entry that can be merged into the linker
  39         /// generated EXIDX_CANTUNWIND as if the assembler had generated it.
  40         .section .text.03, "ax",%progbits
  41         .global f3
  42 f3:
  43         .fnstart
  44         bx lr
  45         .cantunwind
  46         .fnend
  47
  48         /// Dummy implementation of personality routines to satisfy reference
  49         /// from exception tables, linker will generate EXIDX_CANTUNWIND.
  50         .section .text.__aeabi_unwind_cpp_pr0, "ax", %progbits
  51         .global __aeabi_unwind_cpp_pr0
  52 __aeabi_unwind_cpp_pr0:
  53         bx lr
  54
  55 /// f1, f2
  56 // CHECK:      100d4 28000100 08849780 24000100 01000000
  57 /// f3, __aeabi_unwind_cpp_pr0
  58 // CHECK-NEXT: 100e4 20000100 01000000 1c000100 01000000
  59 /// sentinel
  60 // CHECK-NEXT: 100f4 18000100 01000000
  61
  62 /// f1, (f2, f3, __aeabi_unwind_cpp_pr0)
  63 // CHECK-MERGE:      100d4 18000100 08849780 14000100 01000000
  64 /// sentinel
  65 // CHECK-MERGE-NEXT: 100e4 18000100 01000000
  66