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/* Copyright (C) 2012-2022 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Atomic Library (libatomic).
Libatomic 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 3 of the License, or
(at your option) any later version.
Libatomic 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include <config/arm/arm-config.h>
/* Kernel helper for 32-bit compare-and-exchange. */
typedef int (__kernel_cmpxchg_t) (UWORD oldval, UWORD newval, UWORD *ptr);
#define __kernel_cmpxchg (*(__kernel_cmpxchg_t *) 0xffff0fc0)
/* Kernel helper for 64-bit compare-and-exchange. */
typedef int (__kernel_cmpxchg64_t) (const U_8 * oldval, const U_8 * newval,
U_8 *ptr);
#define __kernel_cmpxchg64 (*(__kernel_cmpxchg64_t *) 0xffff0f60)
/* Kernel helper for memory barrier. */
typedef void (__kernel_dmb_t) (void);
#define __kernel_dmb (*(__kernel_dmb_t *) 0xffff0fa0)
/* Kernel helper page version number. */
static inline unsigned*
__kernel_helper_version ()
{
unsigned *volatile addr = (unsigned int *)0xffff0ffc;
return addr;
}
#define __kernel_helper_version (*__kernel_helper_version())
#ifndef HAVE_STREX
static inline bool
atomic_compare_exchange_w (UWORD *mptr, UWORD *eptr, UWORD newval,
bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
{
bool ret = true;
UWORD oldval;
oldval = *eptr;
if (__builtin_expect (__kernel_cmpxchg (oldval, newval, mptr) != 0, 0))
{
oldval = *mptr;
ret = false;
}
*eptr = oldval;
return ret;
}
# define atomic_compare_exchange_w atomic_compare_exchange_w
# if N == WORDSIZE
# define atomic_compare_exchange_n atomic_compare_exchange_w
# endif
#endif /* HAVE_STREX */
#if !defined(HAVE_STREXBHD) && defined(HAVE_KERNEL64) && N == 8
static inline bool
atomic_compare_exchange_n (UTYPE *mptr, UTYPE *eptr, UTYPE newval,
bool weak_p UNUSED, int sm UNUSED, int fm UNUSED)
{
if (__kernel_cmpxchg64 (eptr, &newval, mptr) == 0)
return true;
else
{
*eptr = *mptr;
return false;
}
}
#define atomic_compare_exchange_n atomic_compare_exchange_n
#endif
#if !defined(HAVE_DMB) && !defined(HAVE_DMB_MCR)
static inline void
pre_barrier(int model UNUSED)
{
__kernel_dmb ();
}
static inline void
post_barrier(int model UNUSED)
{
__kernel_dmb ();
}
# define pre_post_barrier 1
#endif /* !HAVE_DMB */
#if HAVE_IFUNC
extern bool libat_have_strexbhd HIDDEN;
# define IFUNC_COND_1 libat_have_strexbhd
# define IFUNC_COND_2 (__kernel_helper_version >= 5)
/* Alternative 1 is -march=armv7-a -- we have everything native. */
# if IFUNC_ALT == 1
# undef HAVE_ATOMIC_CAS_1
# undef HAVE_ATOMIC_CAS_2
# undef HAVE_ATOMIC_CAS_4
# undef HAVE_ATOMIC_CAS_8
# undef HAVE_ATOMIC_EXCHANGE_1
# undef HAVE_ATOMIC_EXCHANGE_2
# undef HAVE_ATOMIC_EXCHANGE_4
# undef HAVE_ATOMIC_EXCHANGE_8
# undef HAVE_ATOMIC_LDST_1
# undef HAVE_ATOMIC_LDST_2
# undef HAVE_ATOMIC_LDST_4
# undef HAVE_ATOMIC_LDST_8
# undef HAVE_ATOMIC_FETCH_OP_1
# undef HAVE_ATOMIC_FETCH_OP_2
# undef HAVE_ATOMIC_FETCH_OP_4
# undef HAVE_ATOMIC_FETCH_OP_8
# undef HAVE_ATOMIC_TAS_1
# undef HAVE_ATOMIC_TAS_2
# undef HAVE_ATOMIC_TAS_4
# undef HAVE_ATOMIC_TAS_8
# define HAVE_ATOMIC_CAS_1 1
# define HAVE_ATOMIC_CAS_2 1
# define HAVE_ATOMIC_CAS_4 1
# define HAVE_ATOMIC_CAS_8 1
# define HAVE_ATOMIC_EXCHANGE_1 1
# define HAVE_ATOMIC_EXCHANGE_2 1
# define HAVE_ATOMIC_EXCHANGE_4 1
# define HAVE_ATOMIC_EXCHANGE_8 1
# define HAVE_ATOMIC_LDST_1 1
# define HAVE_ATOMIC_LDST_2 1
# define HAVE_ATOMIC_LDST_4 1
# define HAVE_ATOMIC_LDST_8 1
# define HAVE_ATOMIC_FETCH_OP_1 1
# define HAVE_ATOMIC_FETCH_OP_2 1
# define HAVE_ATOMIC_FETCH_OP_4 1
# define HAVE_ATOMIC_FETCH_OP_8 1
# define HAVE_ATOMIC_TAS_1 1
# define HAVE_ATOMIC_TAS_2 1
# define HAVE_ATOMIC_TAS_4 1
# define HAVE_ATOMIC_TAS_8 1
# endif /* IFUNC_ALT == 1 */
# undef MAYBE_HAVE_ATOMIC_CAS_1
# define MAYBE_HAVE_ATOMIC_CAS_1 IFUNC_COND_1
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_1
# define MAYBE_HAVE_ATOMIC_EXCHANGE_1 MAYBE_HAVE_ATOMIC_CAS_1
# undef MAYBE_HAVE_ATOMIC_LDST_1
# define MAYBE_HAVE_ATOMIC_LDST_1 MAYBE_HAVE_ATOMIC_CAS_1
# undef MAYBE_HAVE_ATOMIC_CAS_2
# define MAYBE_HAVE_ATOMIC_CAS_2 IFUNC_COND_1
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_2
# define MAYBE_HAVE_ATOMIC_EXCHANGE_2 MAYBE_HAVE_ATOMIC_CAS_2
# undef MAYBE_HAVE_ATOMIC_LDST_2
# define MAYBE_HAVE_ATOMIC_LDST_2 MAYBE_HAVE_ATOMIC_CAS_2
# undef MAYBE_HAVE_ATOMIC_CAS_4
# define MAYBE_HAVE_ATOMIC_CAS_4 IFUNC_COND_1
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_4
# define MAYBE_HAVE_ATOMIC_EXCHANGE_4 MAYBE_HAVE_ATOMIC_CAS_4
# undef MAYBE_HAVE_ATOMIC_LDST_4
# define MAYBE_HAVE_ATOMIC_LDST_4 MAYBE_HAVE_ATOMIC_CAS_4
# undef MAYBE_HAVE_ATOMIC_CAS_8
# define MAYBE_HAVE_ATOMIC_CAS_8 (IFUNC_COND_1 | IFUNC_COND_2)
# undef MAYBE_HAVE_ATOMIC_EXCHANGE_8
# define MAYBE_HAVE_ATOMIC_EXCHANGE_8 MAYBE_HAVE_ATOMIC_CAS_8
# undef MAYBE_HAVE_ATOMIC_LDST_8
# define MAYBE_HAVE_ATOMIC_LDST_8 MAYBE_HAVE_ATOMIC_CAS_8
# define IFUNC_NCOND(N) (N == 8 ? 2 : 1)
#endif /* HAVE_IFUNC */
#include_next <host-config.h>
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