nptl/sysdeps/sparc/sparc64/pthread_spin_lock.S

   1 /* Copyright (C) 2012-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19
  20         .text
  21 ENTRY(pthread_spin_lock)
  22         ldstub          [%o0], %g1
  23         brnz,pn         %g1, 2f
  24          membar         #StoreLoad | #StoreStore
  25 1:      retl
  26          mov            0, %o0
  27 2:      ldub            [%o0], %g1
  28         brnz,pt         %g1, 2b
  29          membar         #LoadLoad
  30         ba,a,pt         %xcc, 1b
  31 END(pthread_spin_lock)