gdb/testsuite/gdb.arch/i386-signal.c

   1 /* Unwinder test program for signal frames.
   2
   3    Copyright 2007-2023 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 void sigframe (void);
  21 void setup (void);
  22
  23 void
  24 func (void)
  25 {
  26 }
  27
  28 int
  29 main (void)
  30 {
  31   setup ();
  32 }
  33
  34 /* Create an imitation signal frame.  This will work on any x86 or
  35    x86-64 target which uses a version of GAS recent enough for
  36    .cfi_signal_frame (added 2006-02-27 and included in binutils 2.17).
  37    The default CIE created by gas suffices to unwind from an empty
  38    function.  */
  39
  40 /* Note: to make sure that the Dwarf unwinder gets to handle
  41    the frame, we add an extra 'nop' after the label.  Otherwise,
  42    the epilogue unwinder will see the 'ret' and grab the frame.  */
  43
  44 asm(".text\n"
  45     "    .align 8\n"
  46     "    .globl setup\n"
  47     "setup:\n"
  48     "    push $sigframe\n"
  49     "    jmp func\n"
  50     "\n"
  51     "    .cfi_startproc\n"
  52     "    .cfi_signal_frame\n"
  53     "    nop\n"
  54     "    .globl sigframe\n"
  55     "sigframe:\n"
  56     "    nop\n"
  57     "    ret\n"
  58     "    .cfi_endproc");