atomicops-internals-linuxppc.h revision 5821806d5e7f356e8fa4b058a389a808ea183019
15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)/* Copyright (c) 2008, Google Inc. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * All rights reserved. 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * Redistribution and use in source and binary forms, with or without 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * modification, are permitted provided that the following conditions are 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * met: 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * * Redistributions of source code must retain the above copyright 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * notice, this list of conditions and the following disclaimer. 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * * Redistributions in binary form must reproduce the above 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * copyright notice, this list of conditions and the following disclaimer 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * in the documentation and/or other materials provided with the 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * distribution. 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * * Neither the name of Google Inc. nor the names of its 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * contributors may be used to endorse or promote products derived from 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * this software without specific prior written permission. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) * --- 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) */ 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Implementation of atomic operations for ppc-linux. This file should not 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// be included directly. Clients should instead include 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// "base/atomicops.h". 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_ 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_ 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef int32_t Atomic32; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __PPC64__ 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define BASE_HAS_ATOMIC64 1 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace subtle { 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline void _sync(void) { 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__("sync": : : "memory"); 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline void _lwsync(void) { 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // gcc defines __NO_LWSYNC__ when appropriate; see 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // http://gcc.gnu.org/ml/gcc-patches/2006-11/msg01238.html 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __NO_LWSYNC__ 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__("msync": : : "memory"); 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#else 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__("lwsync": : : "memory"); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline void _isync(void) { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__("isync": : : "memory"); 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic32 OSAtomicAdd32(Atomic32 amount, Atomic32 *value) { 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 t; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__( 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)"1: lwarx %0,0,%3\n\ 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) add %0,%2,%0\n\ 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) stwcx. %0,0,%3 \n\ 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 1b" 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "=&r" (t), "+m" (*value) 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "r" (amount), "r" (value) 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "cc"); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return t; 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic32 OSAtomicAdd32Barrier(Atomic32 amount, Atomic32 *value) { 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 t; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _lwsync(); 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) t = OSAtomicAdd32(amount, value); 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is based on the code snippet in the architecture manual (Vol 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 2, Appendix B). It's a little tricky: correctness depends on the 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // fact that the code right before this (in OSAtomicAdd32) has a 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // conditional branch with a data dependency on the update. 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Otherwise, we'd have to use sync. 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _isync(); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return t; 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline bool OSAtomicCompareAndSwap32(Atomic32 old_value, 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value, 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 *value) { 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 prev; 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__( 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)"1: lwarx %0,0,%2\n\ 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cmpw 0,%0,%3\n\ 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 2f\n\ 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) stwcx. %4,0,%2\n\ 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 1b\n\ 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)2:" 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "=&r" (prev), "+m" (*value) 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "r" (value), "r" (old_value), "r" (new_value) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "cc"); 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev == old_value; 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic32 OSAtomicCompareAndSwap32Acquire(Atomic32 old_value, 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value, 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 *value) { 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 t; 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) t = OSAtomicCompareAndSwap32(old_value, new_value, value); 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is based on the code snippet in the architecture manual (Vol 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 2, Appendix B). It's a little tricky: correctness depends on the 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // fact that the code right before this (in 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // OSAtomicCompareAndSwap32) has a conditional branch with a data 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // dependency on the update. Otherwise, we'd have to use sync. 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _isync(); 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return t; 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic32 OSAtomicCompareAndSwap32Release(Atomic32 old_value, 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value, 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 *value) { 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _lwsync(); 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return OSAtomicCompareAndSwap32(old_value, new_value, value); 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)typedef int64_t Atomic64; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline void MemoryBarrier() { 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This can't be _lwsync(); we need to order the immediately 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // preceding stores against any load that may follow, but lwsync 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // doesn't guarantee that. 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _sync(); 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 32-bit Versions. 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr, 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 old_value, 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value) { 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 prev_value; 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (OSAtomicCompareAndSwap32(old_value, new_value, 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const_cast<Atomic32*>(ptr))) { 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return old_value; 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) prev_value = *ptr; 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (prev_value == old_value); 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev_value; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr, 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value) { 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 old_value; 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) old_value = *ptr; 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (!OSAtomicCompareAndSwap32(old_value, new_value, 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const_cast<Atomic32*>(ptr))); 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return old_value; 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr, 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 increment) { 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr)); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr, 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 increment) { 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr)); 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr, 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 old_value, 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value) { 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 prev_value; 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (OSAtomicCompareAndSwap32Acquire(old_value, new_value, 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const_cast<Atomic32*>(ptr))) { 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return old_value; 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) prev_value = *ptr; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (prev_value == old_value); 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev_value; 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr, 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 old_value, 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 new_value) { 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic32 prev_value; 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) do { 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (OSAtomicCompareAndSwap32Release(old_value, new_value, 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const_cast<Atomic32*>(ptr))) { 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return old_value; 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) prev_value = *ptr; 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } while (prev_value == old_value); 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev_value; 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifdef __PPC64__ 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 64-bit Versions. 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2083551c9c881056c480085172ff9840cab31610854Torne (Richard Coles)static inline Atomic64 OSAtomicAdd64(Atomic64 amount, Atomic64 *value) { 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 t; 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__( 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)"1: ldarx %0,0,%3\n\ 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) add %0,%2,%0\n\ 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) stdcx. %0,0,%3 \n\ 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 1b" 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "=&r" (t), "+m" (*value) 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "r" (amount), "r" (value) 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "cc"); 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return t; 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic64 OSAtomicAdd64Barrier(Atomic64 amount, Atomic64 *value) { 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 t; 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _lwsync(); 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) t = OSAtomicAdd64(amount, value); 2253551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) // This is based on the code snippet in the architecture manual (Vol 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 2, Appendix B). It's a little tricky: correctness depends on the 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // fact that the code right before this (in OSAtomicAdd64) has a 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // conditional branch with a data dependency on the update. 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Otherwise, we'd have to use sync. 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _isync(); 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return t; 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline bool OSAtomicCompareAndSwap64(Atomic64 old_value, 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 new_value, 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 *value) { 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 prev; 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) __asm__ __volatile__( 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)"1: ldarx %0,0,%2\n\ 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cmpw 0,%0,%3\n\ 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 2f\n\ 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) stdcx. %4,0,%2\n\ 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bne- 1b\n\ 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)2:" 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "=&r" (prev), "+m" (*value) 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "r" (value), "r" (old_value), "r" (new_value) 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : "cc"); 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev == old_value; 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static inline Atomic64 OSAtomicCompareAndSwap64Acquire(Atomic64 old_value, 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 new_value, 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 *value) { 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Atomic64 t; 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) t = OSAtomicCompareAndSwap64(old_value, new_value, value); 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is based on the code snippet in the architecture manual (Vol 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 2, Appendix B). It's a little tricky: correctness depends on the 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // fact that the code right before this (in 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // OSAtomicCompareAndSwap64) has a conditional branch with a data 260ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch // dependency on the update. Otherwise, we'd have to use sync. 261ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch _isync(); 262ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return t; 263ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 264ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 265ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochstatic inline Atomic64 OSAtomicCompareAndSwap64Release(Atomic64 old_value, 266ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 new_value, 267ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 *value) { 268ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch _lwsync(); 269ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return OSAtomicCompareAndSwap64(old_value, new_value, value); 270ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 271ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 272ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 273ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr, 274ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 old_value, 275ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 new_value) { 276ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 prev_value; 277ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch do { 278ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch if (OSAtomicCompareAndSwap64(old_value, new_value, 279ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch const_cast<Atomic64*>(ptr))) { 280ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return old_value; 281ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } 282ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch prev_value = *ptr; 283ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } while (prev_value == old_value); 284ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return prev_value; 285ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 286ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 287ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr, 288ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 new_value) { 289ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 old_value; 290ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch do { 291ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch old_value = *ptr; 292ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } while (!OSAtomicCompareAndSwap64(old_value, new_value, 293ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch const_cast<Atomic64*>(ptr))); 294ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return old_value; 295ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 296ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 297ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr, 298ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 increment) { 299ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return OSAtomicAdd64(increment, const_cast<Atomic64*>(ptr)); 300ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 301ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 302ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr, 303ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 increment) { 304ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return OSAtomicAdd64Barrier(increment, const_cast<Atomic64*>(ptr)); 305ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 306ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 307ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr, 308ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 old_value, 309ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 new_value) { 310ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 prev_value; 311ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch do { 312ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch if (OSAtomicCompareAndSwap64Acquire(old_value, new_value, 313ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch const_cast<Atomic64*>(ptr))) { 314ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return old_value; 315ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } 316ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch prev_value = *ptr; 317ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } while (prev_value == old_value); 318ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return prev_value; 319ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 320ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch 321ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdochinline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr, 322ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 old_value, 323ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 new_value) { 324ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch Atomic64 prev_value; 325ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch do { 326ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch if (OSAtomicCompareAndSwap64Release(old_value, new_value, 327ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch const_cast<Atomic64*>(ptr))) { 328ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch return old_value; 329ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } 330ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch prev_value = *ptr; 331ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch } while (prev_value == old_value); 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return prev_value; 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline void NoBarrier_Store(volatile Atomic32 *ptr, Atomic32 value) { 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *ptr = value; 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) { 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *ptr = value; 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This can't be _lwsync(); we need to order the immediately 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // preceding stores against any load that may follow, but lwsync 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // doesn't guarantee that. 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _sync(); 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) { 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) _lwsync(); 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *ptr = value; 352ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch} 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)inline Atomic32 NoBarrier_Load(volatile const Atomic32 *ptr) { 355 return *ptr; 356} 357 358inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) { 359 Atomic32 value = *ptr; 360 _lwsync(); 361 return value; 362} 363 364inline Atomic32 Release_Load(volatile const Atomic32 *ptr) { 365 // This can't be _lwsync(); we need to order the immediately 366 // preceding stores against any load that may follow, but lwsync 367 // doesn't guarantee that. 368 _sync(); 369 return *ptr; 370} 371 372#ifdef __PPC64__ 373 374// 64-bit Versions. 375 376inline void NoBarrier_Store(volatile Atomic64 *ptr, Atomic64 value) { 377 *ptr = value; 378} 379 380inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) { 381 *ptr = value; 382 // This can't be _lwsync(); we need to order the immediately 383 // preceding stores against any load that may follow, but lwsync 384 // doesn't guarantee that. 385 _sync(); 386} 387 388inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) { 389 _lwsync(); 390 *ptr = value; 391} 392 393inline Atomic64 NoBarrier_Load(volatile const Atomic64 *ptr) { 394 return *ptr; 395} 396 397inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) { 398 Atomic64 value = *ptr; 399 _lwsync(); 400 return value; 401} 402 403inline Atomic64 Release_Load(volatile const Atomic64 *ptr) { 404 // This can't be _lwsync(); we need to order the immediately 405 // preceding stores against any load that may follow, but lwsync 406 // doesn't guarantee that. 407 _sync(); 408 return *ptr; 409} 410 411#endif 412 413} // namespace base::subtle 414} // namespace base 415 416#endif // BASE_ATOMICOPS_INTERNALS_LINUXPPC_H_ 417