gdb/testsuite/gdb.arch/ppc64-atomic-inst.c

   1 /* This file is part of GDB, the GNU debugger.
   2
   3    Copyright 2008 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 #include <stdio.h>
  19
  20 int main()
  21 {
  22   unsigned int word = 0;
  23   unsigned int *word_addr = &word;
  24   unsigned long dword = 0;
  25   unsigned long *dword_addr = &dword;
  26
  27   __asm __volatile ("1:     lwarx   %0,0,%2\n"              \
  28                     "       addi    %0,%0,1\n"              \
  29                     "       stwcx.  %0,0,%2\n"              \
  30                     "       bne-    1b"                     \
  31                     : "=&b" (word), "=m" (*word_addr)       \
  32                     : "b" (word_addr), "m" (*word_addr)     \
  33                     : "cr0", "memory");                     \
  34
  35   __asm __volatile ("1:     ldarx   %0,0,%2\n"              \
  36                     "       addi    %0,%0,1\n"              \
  37                     "       stdcx.  %0,0,%2\n"              \
  38                     "       bne-    1b"                     \
  39                     : "=&b" (dword), "=m" (*dword_addr)     \
  40                     : "b" (dword_addr), "m" (*dword_addr)   \
  41                     : "cr0", "memory");                     \
  42
  43   return 0;
  44 }