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Diffstat (limited to 'config/cpu/m68k/atomicity.h')
| -rw-r--r-- | config/cpu/m68k/atomicity.h | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/config/cpu/m68k/atomicity.h b/config/cpu/m68k/atomicity.h deleted file mode 100644 index 8b224e2..0000000 --- a/config/cpu/m68k/atomicity.h +++ /dev/null @@ -1,140 +0,0 @@ -// Low-level functions for atomic operations: m68k version -*- C++ -*- - -// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. -// -// This file is part of the GNU ISO C++ Library. This library is free -// software; you can redistribute it and/or modify it under the -// terms of the GNU General Public License as published by the -// Free Software Foundation; either version 2, or (at your option) -// any later version. - -// This library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. - -// You should have received a copy of the GNU General Public License along -// with this library; see the file COPYING. If not, write to the Free -// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, -// USA. - -// As a special exception, you may use this file as part of a free software -// library without restriction. Specifically, if other files instantiate -// templates or use macros or inline functions from this file, or you compile -// this file and link it with other files to produce an executable, this -// file does not by itself cause the resulting executable to be covered by -// the GNU General Public License. This exception does not however -// invalidate any other reasons why the executable file might be covered by -// the GNU General Public License. - -#ifndef _GLIBCXX_ATOMICITY_H -#define _GLIBCXX_ATOMICITY_H 1 - -typedef int _Atomic_word; - -#if ( defined(__mc68020__) || defined(__mc68030__) \ - || defined(__mc68040__) || defined(__mc68060__) ) \ - && !defined(__mcpu32__) -// These variants support compare-and-swap. - -static inline _Atomic_word -__attribute__ ((__unused__)) -__exchange_and_add (volatile _Atomic_word* __mem, int __val) -{ - register _Atomic_word __result = *__mem; - register _Atomic_word __temp; - - __asm__ __volatile__ ("1: move%.l %0,%1\n\t" - "add%.l %3,%1\n\t" - "cas%.l %0,%1,%2\n\t" - "jne 1b" - : "=d" (__result), "=&d" (__temp), "=m" (*__mem) - : "d" (__val), "0" (__result), "m" (*__mem)); - return __result; -} - -#elif defined(__rtems__) -/* - * TAS/JBNE is unsafe on systems with strict priority-based scheduling. - * Disable interrupts, which we can do only from supervisor mode. - */ -static inline _Atomic_word -__attribute__ ((__unused__)) -__exchange_and_add (volatile _Atomic_word* __mem, int __val) -{ - _Atomic_word __result; - short __level, __tmpsr; - - __asm__ __volatile__ ("move%.w %%sr,%0\n\tor%.l %0,%1\n\tmove%.w %1,%%sr" - : "=d" (__level), "=d" (__tmpsr) : "1" (0x700)); - - __result = *__mem; - *__mem = __result + __val; - - __asm__ __volatile__ ("move%.w %0,%%sr" : : "d" (__level)); - - return __result; -} - -#else - -template<int __inst> -struct __Atomicity_lock { - static volatile unsigned char _S_atomicity_lock; -}; - -template<int __inst> -volatile unsigned char __Atomicity_lock<__inst>::_S_atomicity_lock = 0; - -template volatile unsigned char __Atomicity_lock<0>::_S_atomicity_lock; - -static inline _Atomic_word -__attribute__ ((__unused__)) -__exchange_and_add (volatile _Atomic_word* __mem, int __val) -{ - _Atomic_word __result; - -// bset with no immediate addressing (not SMP-safe) -#if defined(__mcf5200__) || defined(__mcf5300__) - __asm__ __volatile__ ("1: bset.b #7,%0@\n\tjbne 1b" - : /* no outputs */ - : "a" (&__Atomicity_lock<0>::_S_atomicity_lock) - : "cc", "memory"); - -// CPU32 and MCF5400 support test-and-set (SMP-safe). -#elif defined(__mcpu32__) || defined(__mcf5400__) - __asm__ __volatile__ ("1: tas %0\n\tjbne 1b" - : "+m" (__Atomicity_lock<0>::_S_atomicity_lock) - : /* none */ - : "cc"); - -// Use bset with immediate addressing for 68000/68010 (not SMP-safe) -// NOTE: TAS is available on the 68000, but unsupported by some Amiga -// memory controllers. -#else - __asm__ __volatile__ ("1: bset.b #7,%0\n\tjbne 1b" - : "+m" (__Atomicity_lock<0>::_S_atomicity_lock) - : /* none */ - : "cc"); -#endif - - __result = *__mem; - *__mem = __result + __val; - - __Atomicity_lock<0>::_S_atomicity_lock = 0; - - return __result; -} - -#endif /* TAS / BSET */ - -static inline void -__attribute__ ((__unused__)) -__atomic_add (volatile _Atomic_word* __mem, int __val) -{ - // Careful: using add.l with a memory destination is not - // architecturally guaranteed to be atomic. - (void)__exchange_and_add (__mem, __val); -} - -#endif /* !_GLIBCXX_ATOMICITY_H */ |