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364 lines
13 KiB
C
364 lines
13 KiB
C
/* Atomic operations. sparc32 version.
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Copyright (C) 2003-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.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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#ifndef _ATOMIC_MACHINE_H
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#define _ATOMIC_MACHINE_H 1
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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 __HAVE_64B_ATOMICS 0
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#define USE_ATOMIC_COMPILER_BUILTINS 0
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/* XXX Is this actually correct? */
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#define ATOMIC_EXCHANGE_USES_CAS 1
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/* We have no compare and swap, just test and set.
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The following implementation contends on 64 global locks
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per library and assumes no variable will be accessed using atomic.h
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macros from two different libraries. */
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__make_section_unallocated
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(".gnu.linkonce.b.__sparc32_atomic_locks, \"aw\", %nobits");
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volatile unsigned char __sparc32_atomic_locks[64]
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__attribute__ ((nocommon, section (".gnu.linkonce.b.__sparc32_atomic_locks"
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__sec_comment),
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visibility ("hidden")));
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#define __sparc32_atomic_do_lock(addr) \
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do \
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{ \
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unsigned int __old_lock; \
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unsigned int __idx = (((long) addr >> 2) ^ ((long) addr >> 12)) \
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& 63; \
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do \
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__asm __volatile ("ldstub %1, %0" \
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: "=r" (__old_lock), \
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"=m" (__sparc32_atomic_locks[__idx]) \
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: "m" (__sparc32_atomic_locks[__idx]) \
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: "memory"); \
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while (__old_lock); \
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} \
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while (0)
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#define __sparc32_atomic_do_unlock(addr) \
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do \
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{ \
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__sparc32_atomic_locks[(((long) addr >> 2) \
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^ ((long) addr >> 12)) & 63] = 0; \
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__asm __volatile ("" ::: "memory"); \
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} \
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while (0)
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#define __sparc32_atomic_do_lock24(addr) \
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do \
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{ \
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unsigned int __old_lock; \
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do \
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__asm __volatile ("ldstub %1, %0" \
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: "=r" (__old_lock), "=m" (*(addr)) \
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: "m" (*(addr)) \
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: "memory"); \
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while (__old_lock); \
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} \
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while (0)
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#define __sparc32_atomic_do_unlock24(addr) \
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do \
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{ \
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__asm __volatile ("" ::: "memory"); \
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*(char *) (addr) = 0; \
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} \
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while (0)
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#ifndef SHARED
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# define __v9_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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({union { __typeof (oldval) a; uint32_t v; } oldval_arg = { .a = (oldval) }; \
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union { __typeof (newval) a; uint32_t v; } newval_arg = { .a = (newval) }; \
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register uint32_t __acev_tmp __asm ("%g6"); \
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register __typeof (mem) __acev_mem __asm ("%g1") = (mem); \
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register uint32_t __acev_oldval __asm ("%g5"); \
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__acev_tmp = newval_arg.v; \
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__acev_oldval = oldval_arg.v; \
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/* .word 0xcde05005 is cas [%g1], %g5, %g6. Can't use cas here though, \
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because as will then mark the object file as V8+ arch. */ \
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__asm __volatile (".word 0xcde05005" \
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: "+r" (__acev_tmp), "=m" (*__acev_mem) \
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: "r" (__acev_oldval), "m" (*__acev_mem), \
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"r" (__acev_mem) : "memory"); \
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(__typeof (oldval)) __acev_tmp; })
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#endif
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/* The only basic operation needed is compare and exchange. */
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#define __v7_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ __typeof (mem) __acev_memp = (mem); \
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__typeof (*mem) __acev_ret; \
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__typeof (*mem) __acev_newval = (newval); \
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\
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__sparc32_atomic_do_lock (__acev_memp); \
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__acev_ret = *__acev_memp; \
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if (__acev_ret == (oldval)) \
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*__acev_memp = __acev_newval; \
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__sparc32_atomic_do_unlock (__acev_memp); \
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__acev_ret; })
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#define __v7_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ __typeof (mem) __aceb_memp = (mem); \
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int __aceb_ret; \
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__typeof (*mem) __aceb_newval = (newval); \
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\
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__sparc32_atomic_do_lock (__aceb_memp); \
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__aceb_ret = 0; \
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if (*__aceb_memp == (oldval)) \
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*__aceb_memp = __aceb_newval; \
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else \
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__aceb_ret = 1; \
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__sparc32_atomic_do_unlock (__aceb_memp); \
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__aceb_ret; })
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#define __v7_exchange_acq(mem, newval) \
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({ __typeof (mem) __acev_memp = (mem); \
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__typeof (*mem) __acev_ret; \
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__typeof (*mem) __acev_newval = (newval); \
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\
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__sparc32_atomic_do_lock (__acev_memp); \
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__acev_ret = *__acev_memp; \
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*__acev_memp = __acev_newval; \
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__sparc32_atomic_do_unlock (__acev_memp); \
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__acev_ret; })
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#define __v7_exchange_and_add(mem, value) \
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({ __typeof (mem) __acev_memp = (mem); \
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__typeof (*mem) __acev_ret; \
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\
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__sparc32_atomic_do_lock (__acev_memp); \
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__acev_ret = *__acev_memp; \
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*__acev_memp = __acev_ret + (value); \
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__sparc32_atomic_do_unlock (__acev_memp); \
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__acev_ret; })
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/* Special versions, which guarantee that top 8 bits of all values
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are cleared and use those bits as the ldstub lock. */
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#define __v7_compare_and_exchange_val_24_acq(mem, newval, oldval) \
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({ __typeof (mem) __acev_memp = (mem); \
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__typeof (*mem) __acev_ret; \
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__typeof (*mem) __acev_newval = (newval); \
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\
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__sparc32_atomic_do_lock24 (__acev_memp); \
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__acev_ret = *__acev_memp & 0xffffff; \
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if (__acev_ret == (oldval)) \
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*__acev_memp = __acev_newval; \
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else \
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__sparc32_atomic_do_unlock24 (__acev_memp); \
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__asm __volatile ("" ::: "memory"); \
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__acev_ret; })
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#define __v7_exchange_24_rel(mem, newval) \
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({ __typeof (mem) __acev_memp = (mem); \
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__typeof (*mem) __acev_ret; \
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__typeof (*mem) __acev_newval = (newval); \
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\
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__sparc32_atomic_do_lock24 (__acev_memp); \
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__acev_ret = *__acev_memp & 0xffffff; \
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*__acev_memp = __acev_newval; \
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__asm __volatile ("" ::: "memory"); \
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__acev_ret; })
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#ifdef SHARED
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/* When dynamically linked, we assume pre-v9 libraries are only ever
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used on pre-v9 CPU. */
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# define __atomic_is_v9 0
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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__v7_compare_and_exchange_val_acq (mem, newval, oldval)
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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__v7_compare_and_exchange_bool_acq (mem, newval, oldval)
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# define atomic_exchange_acq(mem, newval) \
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__v7_exchange_acq (mem, newval)
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# define atomic_exchange_and_add(mem, value) \
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__v7_exchange_and_add (mem, value)
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# define atomic_compare_and_exchange_val_24_acq(mem, newval, oldval) \
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({ \
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if (sizeof (*mem) != 4) \
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abort (); \
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__v7_compare_and_exchange_val_24_acq (mem, newval, oldval); })
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# define atomic_exchange_24_rel(mem, newval) \
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({ \
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if (sizeof (*mem) != 4) \
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abort (); \
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__v7_exchange_24_rel (mem, newval); })
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# define atomic_full_barrier() __asm ("" ::: "memory")
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# define atomic_read_barrier() atomic_full_barrier ()
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# define atomic_write_barrier() atomic_full_barrier ()
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#else
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/* In libc.a/libpthread.a etc. we don't know if we'll be run on
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pre-v9 or v9 CPU. To be interoperable with dynamically linked
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apps on v9 CPUs e.g. with process shared primitives, use cas insn
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on v9 CPUs and ldstub on pre-v9. */
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extern uint64_t _dl_hwcap __attribute__((weak));
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# define __atomic_is_v9 \
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(__builtin_expect (&_dl_hwcap != 0, 1) \
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&& __builtin_expect (_dl_hwcap & HWCAP_SPARC_V9, HWCAP_SPARC_V9))
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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__typeof (*mem) __acev_wret; \
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if (sizeof (*mem) != 4) \
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abort (); \
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if (__atomic_is_v9) \
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__acev_wret \
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= __v9_compare_and_exchange_val_32_acq (mem, newval, oldval);\
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else \
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__acev_wret \
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= __v7_compare_and_exchange_val_acq (mem, newval, oldval); \
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__acev_wret; })
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ \
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int __acev_wret; \
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if (sizeof (*mem) != 4) \
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abort (); \
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if (__atomic_is_v9) \
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{ \
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__typeof (oldval) __acev_woldval = (oldval); \
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__acev_wret \
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= __v9_compare_and_exchange_val_32_acq (mem, newval, \
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__acev_woldval) \
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!= __acev_woldval; \
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} \
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else \
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__acev_wret \
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= __v7_compare_and_exchange_bool_acq (mem, newval, oldval); \
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__acev_wret; })
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# define atomic_exchange_rel(mem, newval) \
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({ \
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__typeof (*mem) __acev_wret; \
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if (sizeof (*mem) != 4) \
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abort (); \
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if (__atomic_is_v9) \
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{ \
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__typeof (mem) __acev_wmemp = (mem); \
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__typeof (*(mem)) __acev_wval = (newval); \
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do \
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__acev_wret = *__acev_wmemp; \
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while (__builtin_expect \
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(__v9_compare_and_exchange_val_32_acq (__acev_wmemp,\
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__acev_wval, \
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__acev_wret) \
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!= __acev_wret, 0)); \
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} \
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else \
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__acev_wret = __v7_exchange_acq (mem, newval); \
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__acev_wret; })
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# define atomic_compare_and_exchange_val_24_acq(mem, newval, oldval) \
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({ \
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__typeof (*mem) __acev_wret; \
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if (sizeof (*mem) != 4) \
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abort (); \
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if (__atomic_is_v9) \
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__acev_wret \
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= __v9_compare_and_exchange_val_32_acq (mem, newval, oldval);\
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else \
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__acev_wret \
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= __v7_compare_and_exchange_val_24_acq (mem, newval, oldval);\
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__acev_wret; })
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# define atomic_exchange_24_rel(mem, newval) \
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({ \
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__typeof (*mem) __acev_w24ret; \
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if (sizeof (*mem) != 4) \
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abort (); \
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if (__atomic_is_v9) \
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__acev_w24ret = atomic_exchange_rel (mem, newval); \
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else \
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__acev_w24ret = __v7_exchange_24_rel (mem, newval); \
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__acev_w24ret; })
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#define atomic_full_barrier() \
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do { \
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if (__atomic_is_v9) \
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/* membar #LoadLoad | #LoadStore | #StoreLoad | #StoreStore */ \
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__asm __volatile (".word 0x8143e00f" : : : "memory"); \
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else \
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__asm __volatile ("" : : : "memory"); \
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} while (0)
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#define atomic_read_barrier() \
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do { \
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if (__atomic_is_v9) \
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/* membar #LoadLoad | #LoadStore */ \
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__asm __volatile (".word 0x8143e005" : : : "memory"); \
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else \
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__asm __volatile ("" : : : "memory"); \
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} while (0)
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#define atomic_write_barrier() \
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do { \
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if (__atomic_is_v9) \
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/* membar #LoadStore | #StoreStore */ \
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__asm __volatile (".word 0x8143e00c" : : : "memory"); \
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else \
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__asm __volatile ("" : : : "memory"); \
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} while (0)
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#endif
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#include <sysdep.h>
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#endif /* atomic-machine.h */
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