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Diffstat (limited to 'libatomic/config/linux/arm/host-config.h')
| -rw-r--r-- | libatomic/config/linux/arm/host-config.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/libatomic/config/linux/arm/host-config.h b/libatomic/config/linux/arm/host-config.h new file mode 100644 index 0000000..5d87835 --- /dev/null +++ b/libatomic/config/linux/arm/host-config.h @@ -0,0 +1,179 @@ +/* Copyright (C) 2012 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. */ +#define __kernel_helper_version (*(unsigned int *)0xffff0ffc) + + +#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> |