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      1 // Low-level functions for atomic operations: CRIS version  -*- C++ -*-
      2 
      3 // Copyright (C) 2001-2024 Free Software Foundation, Inc.
      4 //
      5 // This file is part of the GNU ISO C++ Library.  This library is free
      6 // software; you can redistribute it and/or modify it under the
      7 // terms of the GNU General Public License as published by the
      8 // Free Software Foundation; either version 3, or (at your option)
      9 // any later version.
     10 
     11 // This library is distributed in the hope that it will be useful,
     12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 // GNU General Public License for more details.
     15 
     16 // Under Section 7 of GPL version 3, you are granted additional
     17 // permissions described in the GCC Runtime Library Exception, version
     18 // 3.1, as published by the Free Software Foundation.
     19 
     20 // You should have received a copy of the GNU General Public License and
     21 // a copy of the GCC Runtime Library Exception along with this program;
     22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     23 // <http://www.gnu.org/licenses/>.
     24 
     25 #include <ext/atomicity.h>
     26 
     27 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
     28 {
     29 _GLIBCXX_BEGIN_NAMESPACE_VERSION
     30 
     31   _Atomic_word
     32   __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
     33   {
     34     int __tmp;
     35     _Atomic_word __result;
     36 
     37 #if (__CRIS_arch_version >= 32)
     38   __asm__ __volatile__ (" clearf p	       \n"
     39 		       "0:		       \n"
     40 		       " move.d %4,%2	       \n"
     41 		       " move.d [%3],%0	       \n"
     42 		       " add.d %0,%2	       \n"
     43 		       " ax		       \n"
     44 		       " move.d %2,[%3]	       \n"
     45 		       " bcs 0b		       \n"
     46 		       " clearf p	       \n"
     47 		       :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
     48 		       : "r" (__mem), "g" (__val), "Q" (*__mem)
     49 		       : "memory");
     50 #elif (__CRIS_arch_version >= 10)
     51     __asm__ __volatile__ (" clearf		\n"
     52 			"0:			\n"
     53 			" move.d %4,%2		\n"
     54 			" move.d [%3],%0	\n"
     55 			" add.d %0,%2		\n"
     56 			" ax			\n"
     57 			" move.d %2,[%3]	\n"
     58 			" bwf 0b		\n"
     59 			" clearf		\n"
     60 			:  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
     61 			: "r" (__mem), "g" (__val), "Q" (*__mem)
     62 			/* The memory clobber must stay, regardless of
     63 			   current uses of this function.  */
     64 			: "memory");
     65 #else
     66     __asm__ __volatile__ (" move $ccr,$r9	\n"
     67 			" di			\n"
     68 			" move.d %4,%2		\n"
     69 			" move.d [%3],%0	\n"
     70 			" add.d %0,%2		\n"
     71 			" move.d %2,[%3]	\n"
     72 			" move $r9,$ccr		\n"
     73 			:  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
     74 			: "r" (__mem), "g" (__val), "Q" (*__mem)
     75 			: "r9",
     76 			  /* The memory clobber must stay, regardless of
     77 			     current uses of this function.  */
     78 			  "memory");
     79 #endif
     80 
     81     return __result;
     82   }
     83 
     84   void
     85   __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
     86   { __exchange_and_add(__mem, __val); }
     87 
     88 _GLIBCXX_END_NAMESPACE_VERSION
     89 } // namespace
     90