mirror of
https://github.com/yuzu-emu/unicorn
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da01e53757
Force the use of cmpxchg16b on x86_64. Wikipedia suggests that only very old AMD64 (circa 2004) did not have this instruction. Further, it's required by Windows 8 so no new cpus will ever omit it. If we truely care about these, then we could check this at startup time and then avoid executing paths that use it. Backports commit 7ebee43ee3e2fcd7b5063058b7ef74bc43216733 from qemu
215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/*
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* Atomic helper templates
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* Included from tcg-runtime.c and cputlb.c.
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*
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* Copyright (c) 2016 Red Hat, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#if DATA_SIZE == 16
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# define SUFFIX o
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# define DATA_TYPE Int128
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# define BSWAP bswap128
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#elif DATA_SIZE == 8
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# define SUFFIX q
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# define DATA_TYPE uint64_t
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# define BSWAP bswap64
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#elif DATA_SIZE == 4
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# define SUFFIX l
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# define DATA_TYPE uint32_t
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# define BSWAP bswap32
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#elif DATA_SIZE == 2
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# define SUFFIX w
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# define DATA_TYPE uint16_t
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# define BSWAP bswap16
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#elif DATA_SIZE == 1
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# define SUFFIX b
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# define DATA_TYPE uint8_t
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# define BSWAP
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#else
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# error unsupported data size
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#endif
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#if DATA_SIZE >= 4
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# define ABI_TYPE DATA_TYPE
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#else
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# define ABI_TYPE uint32_t
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#endif
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/* Define host-endian atomic operations. Note that END is used within
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the ATOMIC_NAME macro, and redefined below. */
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#if DATA_SIZE == 1
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# define END
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#elif defined(HOST_WORDS_BIGENDIAN)
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# define END _be
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#else
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# define END _le
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#endif
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ABI_TYPE ATOMIC_NAME(cmpxchg)(CPUArchState *env, target_ulong addr,
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ABI_TYPE cmpv, ABI_TYPE newv EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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return atomic_cmpxchg__nocheck(haddr, cmpv, newv);
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}
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#if DATA_SIZE >= 16
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ABI_TYPE ATOMIC_NAME(ld)(CPUArchState *env, target_ulong addr EXTRA_ARGS)
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{
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DATA_TYPE val, *haddr = ATOMIC_MMU_LOOKUP;
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__atomic_load(haddr, &val, __ATOMIC_RELAXED);
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return val;
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}
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void ATOMIC_NAME(st)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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__atomic_store(haddr, &val, __ATOMIC_RELAXED);
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}
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#else
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ABI_TYPE ATOMIC_NAME(xchg)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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return atomic_xchg__nocheck(haddr, val);
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}
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#define GEN_ATOMIC_HELPER(X) \
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ABI_TYPE ATOMIC_NAME(X)(CPUArchState *env, target_ulong addr, \
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ABI_TYPE val EXTRA_ARGS) \
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{ \
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP; \
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return atomic_##X(haddr, val); \
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} \
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GEN_ATOMIC_HELPER(fetch_add)
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GEN_ATOMIC_HELPER(fetch_and)
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GEN_ATOMIC_HELPER(fetch_or)
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GEN_ATOMIC_HELPER(fetch_xor)
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GEN_ATOMIC_HELPER(add_fetch)
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GEN_ATOMIC_HELPER(and_fetch)
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GEN_ATOMIC_HELPER(or_fetch)
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GEN_ATOMIC_HELPER(xor_fetch)
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#undef GEN_ATOMIC_HELPER
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#endif /* DATA SIZE >= 16 */
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#undef END
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#if DATA_SIZE > 1
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/* Define reverse-host-endian atomic operations. Note that END is used
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within the ATOMIC_NAME macro. */
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#ifdef HOST_WORDS_BIGENDIAN
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# define END _le
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#else
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# define END _be
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#endif
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ABI_TYPE ATOMIC_NAME(cmpxchg)(CPUArchState *env, target_ulong addr,
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ABI_TYPE cmpv, ABI_TYPE newv EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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return BSWAP(atomic_cmpxchg__nocheck(haddr, BSWAP(cmpv), BSWAP(newv)));
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}
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#if DATA_SIZE >= 16
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ABI_TYPE ATOMIC_NAME(ld)(CPUArchState *env, target_ulong addr EXTRA_ARGS)
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{
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DATA_TYPE val, *haddr = ATOMIC_MMU_LOOKUP;
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__atomic_load(haddr, &val, __ATOMIC_RELAXED);
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return BSWAP(val);
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}
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void ATOMIC_NAME(st)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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val = BSWAP(val);
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__atomic_store(haddr, &val, __ATOMIC_RELAXED);
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}
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#else
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ABI_TYPE ATOMIC_NAME(xchg)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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return BSWAP(atomic_xchg__nocheck(haddr, BSWAP(val)));
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}
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#define GEN_ATOMIC_HELPER(X) \
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ABI_TYPE ATOMIC_NAME(X)(CPUArchState *env, target_ulong addr, \
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ABI_TYPE val EXTRA_ARGS) \
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{ \
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP; \
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return BSWAP(atomic_##X(haddr, BSWAP(val))); \
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}
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GEN_ATOMIC_HELPER(fetch_and)
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GEN_ATOMIC_HELPER(fetch_or)
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GEN_ATOMIC_HELPER(fetch_xor)
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GEN_ATOMIC_HELPER(and_fetch)
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GEN_ATOMIC_HELPER(or_fetch)
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GEN_ATOMIC_HELPER(xor_fetch)
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#undef GEN_ATOMIC_HELPER
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/* Note that for addition, we need to use a separate cmpxchg loop instead
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of bswaps for the reverse-host-endian helpers. */
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ABI_TYPE ATOMIC_NAME(fetch_add)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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DATA_TYPE ldo, ldn, ret, sto;
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ldo = atomic_read__nocheck(haddr);
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while (1) {
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ret = BSWAP(ldo);
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sto = BSWAP(ret + val);
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ldn = atomic_cmpxchg__nocheck(haddr, ldo, sto);
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if (ldn == ldo) {
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return ret;
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}
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ldo = ldn;
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}
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}
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ABI_TYPE ATOMIC_NAME(add_fetch)(CPUArchState *env, target_ulong addr,
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ABI_TYPE val EXTRA_ARGS)
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{
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DATA_TYPE *haddr = ATOMIC_MMU_LOOKUP;
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DATA_TYPE ldo, ldn, ret, sto;
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ldo = atomic_read__nocheck(haddr);
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while (1) {
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ret = BSWAP(ldo) + val;
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sto = BSWAP(ret);
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ldn = atomic_cmpxchg__nocheck(haddr, ldo, sto);
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if (ldn == ldo) {
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return ret;
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}
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ldo = ldn;
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}
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}
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#endif /* DATA_SIZE >= 16 */
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#undef END
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#endif /* DATA_SIZE > 1 */
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#undef BSWAP
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#undef ABI_TYPE
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#undef DATA_TYPE
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#undef SUFFIX
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#undef DATA_SIZE
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