gdb/testsuite/gdb.arch/aarch64-atomic-inst.c

   1 /* This file is part of GDB, the GNU debugger.
   2
   3    Copyright 2008-2020 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 int main(void)
  19 {
  20   unsigned long tmp, cond;
  21   unsigned long dword = 0;
  22
  23   /* Test that we can step over ldxr/stxr. This sequence should step from
  24      ldxr to the following __asm __volatile.  */
  25   __asm __volatile ("1:     ldxr    %0,%2\n"                             \
  26                     "       cmp     %0,#1\n"                             \
  27                     "       b.eq    out\n"                               \
  28                     "       add     %0,%0,1\n"                           \
  29                     "       stxr    %w1,%0,%2\n"                         \
  30                     "       cbnz    %w1,1b"                              \
  31                     : "=&r" (tmp), "=&r" (cond), "+Q" (dword)            \
  32                     : : "memory");
  33
  34   /* This sequence should take the conditional branch and step from ldxr
  35      to the return dword line.  */
  36   __asm __volatile ("1:     ldxr    %0,%2\n"                             \
  37                     "       cmp     %0,#1\n"                             \
  38                     "       b.eq    out\n"                               \
  39                     "       add     %0,%0,1\n"                           \
  40                     "       stxr    %w1,%0,%2\n"                         \
  41                     "       cbnz    %w1,1b\n"                            \
  42                     : "=&r" (tmp), "=&r" (cond), "+Q" (dword)            \
  43                     : : "memory");
  44
  45   dword = -1;
  46 __asm __volatile ("out:\n");
  47   return dword;
  48 }