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7133957fe8
* sysdeps/unix/sysv/linux/s390/lowlevellock.h: Include
<sysdeps/nptl/lowlevellock.h> and remove macros and
functions that are now defined there.
(SYS_futex): Remove.
(lll_compare_and_swap): Remove.
* sysdeps/s390/bits/atomic.h (atomic_exchange_acq): Define.
121 lines
4.5 KiB
C
121 lines
4.5 KiB
C
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
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The GNU C 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 2.1 of the License, or (at your option) any later version.
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The GNU C 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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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdint.h>
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typedef int8_t atomic8_t;
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typedef uint8_t uatomic8_t;
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typedef int_fast8_t atomic_fast8_t;
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typedef uint_fast8_t uatomic_fast8_t;
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typedef int16_t atomic16_t;
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typedef uint16_t uatomic16_t;
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typedef int_fast16_t atomic_fast16_t;
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typedef uint_fast16_t uatomic_fast16_t;
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typedef int32_t atomic32_t;
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typedef uint32_t uatomic32_t;
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typedef int_fast32_t atomic_fast32_t;
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typedef uint_fast32_t uatomic_fast32_t;
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typedef int64_t atomic64_t;
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typedef uint64_t uatomic64_t;
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typedef int_fast64_t atomic_fast64_t;
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typedef uint_fast64_t uatomic_fast64_t;
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typedef intptr_t atomicptr_t;
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typedef uintptr_t uatomicptr_t;
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typedef intmax_t atomic_max_t;
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typedef uintmax_t uatomic_max_t;
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#define USE_ATOMIC_COMPILER_BUILTINS 0
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#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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({ __typeof (mem) __archmem = (mem); \
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__typeof (*mem) __archold = (oldval); \
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__asm __volatile ("cs %0,%2,%1" \
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: "+d" (__archold), "=Q" (*__archmem) \
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: "d" (newval), "m" (*__archmem) : "cc", "memory" ); \
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__archold; })
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#ifdef __s390x__
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# define __HAVE_64B_ATOMICS 1
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# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
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({ __typeof (mem) __archmem = (mem); \
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__typeof (*mem) __archold = (oldval); \
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__asm __volatile ("csg %0,%2,%1" \
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: "+d" (__archold), "=Q" (*__archmem) \
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: "d" ((long) (newval)), "m" (*__archmem) : "cc", "memory" ); \
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__archold; })
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#else
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# define __HAVE_64B_ATOMICS 0
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/* For 31 bit we do not really need 64-bit compare-and-exchange. We can
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implement them by use of the csd instruction. The straightforward
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implementation causes warnings so we skip the definition for now. */
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# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#endif
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/* Store NEWVALUE in *MEM and return the old value. */
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/* On s390, the atomic_exchange_acq is different from generic implementation,
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because the generic one does not use the condition-code of cs-instruction
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to determine if looping is needed. Instead it saves the old-value and
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compares it against old-value returned by cs-instruction. */
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#ifdef __s390x__
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# define atomic_exchange_acq(mem, newvalue) \
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({ __typeof (mem) __atg5_memp = (mem); \
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__typeof (*(mem)) __atg5_oldval = *__atg5_memp; \
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__typeof (*(mem)) __atg5_value = (newvalue); \
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if (sizeof (*mem) == 4) \
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__asm __volatile ("0: cs %0,%2,%1\n" \
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" jl 0b" \
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: "+d" (__atg5_oldval), "=Q" (*__atg5_memp) \
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: "d" (__atg5_value), "m" (*__atg5_memp) \
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: "cc", "memory" ); \
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else if (sizeof (*mem) == 8) \
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__asm __volatile ("0: csg %0,%2,%1\n" \
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" jl 0b" \
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: "+d" ( __atg5_oldval), "=Q" (*__atg5_memp) \
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: "d" ((long) __atg5_value), "m" (*__atg5_memp) \
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: "cc", "memory" ); \
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else \
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abort (); \
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__atg5_oldval; })
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#else
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# define atomic_exchange_acq(mem, newvalue) \
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({ __typeof (mem) __atg5_memp = (mem); \
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__typeof (*(mem)) __atg5_oldval = *__atg5_memp; \
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__typeof (*(mem)) __atg5_value = (newvalue); \
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if (sizeof (*mem) == 4) \
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__asm __volatile ("0: cs %0,%2,%1\n" \
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" jl 0b" \
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: "+d" (__atg5_oldval), "=Q" (*__atg5_memp) \
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: "d" (__atg5_value), "m" (*__atg5_memp) \
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: "cc", "memory" ); \
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else \
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abort (); \
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__atg5_oldval; })
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#endif
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