180 lines
5.6 KiB
C
180 lines
5.6 KiB
C
/* Copyright (C) 2012-2017 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Atomic Library (libatomic).
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Libatomic is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <config/arm/arm-config.h>
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/* Kernel helper for 32-bit compare-and-exchange. */
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typedef int (__kernel_cmpxchg_t) (UWORD oldval, UWORD newval, UWORD *ptr);
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#define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0)
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/* Kernel helper for 64-bit compare-and-exchange. */
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typedef int (__kernel_cmpxchg64_t) (const U_8 * oldval, const U_8 * newval,
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U_8 *ptr);
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#define __kernel_cmpxchg64 (*(__kernel_cmpxchg64_t *) 0xffff0f60)
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/* Kernel helper for memory barrier. */
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typedef void (__kernel_dmb_t) (void);
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#define __kernel_dmb (*(__kernel_dmb_t *) 0xffff0fa0)
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/* Kernel helper page version number. */
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#define __kernel_helper_version (*(unsigned int *)0xffff0ffc)
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#ifndef HAVE_STREX
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static inline bool
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atomic_compare_exchange_w (UWORD *mptr, UWORD *eptr, UWORD newval,
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bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
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{
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bool ret = true;
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UWORD oldval;
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oldval = *eptr;
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if (__builtin_expect (__kernel_cmpxchg (oldval, newval, mptr) != 0, 0))
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{
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oldval = *mptr;
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ret = false;
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}
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*eptr = oldval;
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return ret;
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}
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# define atomic_compare_exchange_w atomic_compare_exchange_w
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# if N == WORDSIZE
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# define atomic_compare_exchange_n atomic_compare_exchange_w
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# endif
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#endif /* HAVE_STREX */
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#if !defined(HAVE_STREXBHD) && defined(HAVE_KERNEL64) && N == 8
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static inline bool
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atomic_compare_exchange_n (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
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bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
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{
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if (__kernel_cmpxchg64 (eptr, &newval, mptr) == 0)
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return true;
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else
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{
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*eptr = *mptr;
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return false;
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}
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}
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#define atomic_compare_exchange_n atomic_compare_exchange_n
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#endif
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#if !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
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static inline void
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pre_barrier(int model UNUSED)
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{
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__kernel_dmb ();
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}
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static inline void
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post_barrier(int model UNUSED)
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{
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__kernel_dmb ();
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}
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# define pre_post_barrier 1
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#endif /* !HAVE_DMB */
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#if HAVE_IFUNC
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extern bool libat_have_strexbhd HIDDEN;
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# define IFUNC_COND_1 libat_have_strexbhd
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# define IFUNC_COND_2 (__kernel_helper_version >= 5)
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/* Alternative 1 is -march=armv7-a -- we have everything native. */
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# if IFUNC_ALT == 1
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# undef HAVE_ATOMIC_CAS_1
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# undef HAVE_ATOMIC_CAS_2
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# undef HAVE_ATOMIC_CAS_4
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# undef HAVE_ATOMIC_CAS_8
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# undef HAVE_ATOMIC_EXCHANGE_1
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# undef HAVE_ATOMIC_EXCHANGE_2
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# undef HAVE_ATOMIC_EXCHANGE_4
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# undef HAVE_ATOMIC_EXCHANGE_8
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# undef HAVE_ATOMIC_LDST_1
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# undef HAVE_ATOMIC_LDST_2
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# undef HAVE_ATOMIC_LDST_4
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# undef HAVE_ATOMIC_LDST_8
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# undef HAVE_ATOMIC_FETCH_OP_1
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# undef HAVE_ATOMIC_FETCH_OP_2
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# undef HAVE_ATOMIC_FETCH_OP_4
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# undef HAVE_ATOMIC_FETCH_OP_8
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# undef HAVE_ATOMIC_TAS_1
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# undef HAVE_ATOMIC_TAS_2
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# undef HAVE_ATOMIC_TAS_4
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# undef HAVE_ATOMIC_TAS_8
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# define HAVE_ATOMIC_CAS_1 1
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# define HAVE_ATOMIC_CAS_2 1
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# define HAVE_ATOMIC_CAS_4 1
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# define HAVE_ATOMIC_CAS_8 1
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# define HAVE_ATOMIC_EXCHANGE_1 1
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# define HAVE_ATOMIC_EXCHANGE_2 1
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# define HAVE_ATOMIC_EXCHANGE_4 1
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# define HAVE_ATOMIC_EXCHANGE_8 1
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# define HAVE_ATOMIC_LDST_1 1
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# define HAVE_ATOMIC_LDST_2 1
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# define HAVE_ATOMIC_LDST_4 1
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# define HAVE_ATOMIC_LDST_8 1
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# define HAVE_ATOMIC_FETCH_OP_1 1
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# define HAVE_ATOMIC_FETCH_OP_2 1
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# define HAVE_ATOMIC_FETCH_OP_4 1
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# define HAVE_ATOMIC_FETCH_OP_8 1
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# define HAVE_ATOMIC_TAS_1 1
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# define HAVE_ATOMIC_TAS_2 1
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# define HAVE_ATOMIC_TAS_4 1
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# define HAVE_ATOMIC_TAS_8 1
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# endif /* IFUNC_ALT == 1 */
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# undef MAYBE_HAVE_ATOMIC_CAS_1
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# define MAYBE_HAVE_ATOMIC_CAS_1 IFUNC_COND_1
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# undef MAYBE_HAVE_ATOMIC_EXCHANGE_1
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# define MAYBE_HAVE_ATOMIC_EXCHANGE_1 MAYBE_HAVE_ATOMIC_CAS_1
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# undef MAYBE_HAVE_ATOMIC_LDST_1
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# define MAYBE_HAVE_ATOMIC_LDST_1 MAYBE_HAVE_ATOMIC_CAS_1
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# undef MAYBE_HAVE_ATOMIC_CAS_2
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# define MAYBE_HAVE_ATOMIC_CAS_2 IFUNC_COND_1
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# undef MAYBE_HAVE_ATOMIC_EXCHANGE_2
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# define MAYBE_HAVE_ATOMIC_EXCHANGE_2 MAYBE_HAVE_ATOMIC_CAS_2
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# undef MAYBE_HAVE_ATOMIC_LDST_2
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# define MAYBE_HAVE_ATOMIC_LDST_2 MAYBE_HAVE_ATOMIC_CAS_2
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# undef MAYBE_HAVE_ATOMIC_CAS_4
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# define MAYBE_HAVE_ATOMIC_CAS_4 IFUNC_COND_1
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# undef MAYBE_HAVE_ATOMIC_EXCHANGE_4
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# define MAYBE_HAVE_ATOMIC_EXCHANGE_4 MAYBE_HAVE_ATOMIC_CAS_4
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# undef MAYBE_HAVE_ATOMIC_LDST_4
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# define MAYBE_HAVE_ATOMIC_LDST_4 MAYBE_HAVE_ATOMIC_CAS_4
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# undef MAYBE_HAVE_ATOMIC_CAS_8
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# define MAYBE_HAVE_ATOMIC_CAS_8 (IFUNC_COND_1 | IFUNC_COND_2)
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# undef MAYBE_HAVE_ATOMIC_EXCHANGE_8
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# define MAYBE_HAVE_ATOMIC_EXCHANGE_8 MAYBE_HAVE_ATOMIC_CAS_8
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# undef MAYBE_HAVE_ATOMIC_LDST_8
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# define MAYBE_HAVE_ATOMIC_LDST_8 MAYBE_HAVE_ATOMIC_CAS_8
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# define IFUNC_NCOND(N) (N == 8 ? 2 : 1)
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#endif /* HAVE_IFUNC */
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#include_next <host-config.h>
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