libunwind/test/remember_state_leak.pass.sh.s

   1 #===------------------------------------------------------------------------===#
   2 #
   3 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 # See https://llvm.org/LICENSE.txt for license information.
   5 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 #
   7 #===------------------------------------------------------------------------===#
   8
   9 # REQUIRES: target={{x86_64-.+-linux-gnu}}
  10
  11 # Inline assembly isn't supported by Memory Sanitizer
  12 # UNSUPPORTED: msan
  13
  14 # RUN: %{build} -no-pie
  15 # RUN: %{run}
  16
  17 # The following assembly is a translation of this code:
  18 #
  19 #   _Unwind_Reason_Code callback(int, _Unwind_Action, long unsigned int,
  20 #                                _Unwind_Exception*, _Unwind_Context*, void*) {
  21 #     return _Unwind_Reason_Code(0);
  22 #   }
  23 #
  24 #   int main() {
  25 #     asm(".cfi_remember_state\n\t");
  26 #     _Unwind_Exception exc;
  27 #     _Unwind_ForcedUnwind(&exc, callback, 0);
  28 #     asm(".cfi_restore_state\n\t");
  29 #   }
  30 #
  31 # When unwinding, the CFI parser will stop parsing opcodes after the current PC,
  32 # so in this case the DW_CFA_restore_state opcode will never be processed and,
  33 # if the library doesn't clean up properly, the store allocated by
  34 # DW_CFA_remember_state will be leaked.
  35 #
  36 # This test will fail when linked with an asan-enabled libunwind if the
  37 # remembered state is leaked.
  38
  39     SIZEOF_UNWIND_EXCEPTION = 32
  40
  41     .text
  42 callback:
  43     xorl    %eax, %eax
  44     retq
  45
  46     .globl    main                    # -- Begin function main
  47     .p2align    4, 0x90
  48     .type    main,@function
  49 main:                                   # @main
  50     .cfi_startproc
  51     subq    $8, %rsp   # Adjust stack alignment
  52     subq    $SIZEOF_UNWIND_EXCEPTION, %rsp
  53     .cfi_def_cfa_offset 48
  54     .cfi_remember_state
  55     movq    %rsp, %rdi
  56     movabsq $callback, %rsi
  57     xorl    %edx, %edx
  58     callq    _Unwind_ForcedUnwind
  59     .cfi_restore_state
  60     xorl    %eax, %eax
  61     addq    $SIZEOF_UNWIND_EXCEPTION, %rsp
  62     addq    $8, %rsp   # Undo stack alignment adjustment
  63     .cfi_def_cfa_offset 8
  64     retq
  65 .Lfunc_end1:
  66     .size    main, .Lfunc_end1-main
  67     .cfi_endproc
  68                                         # -- End function