mirror of git://sourceware.org/git/glibc.git
106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
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/* Copyright (C) 2010 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _BITS_ATOMIC_H
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#define _BITS_ATOMIC_H 1
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#include <stdint.h>
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#include <sysdep.h>
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#include <bits/m68k-vdso.h>
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/* Coldfire has no atomic compare-and-exchange operation, but the
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kernel provides userspace atomicity operations. Use them. */
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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 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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/* The only basic operation needed is compare and exchange. */
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/* For ColdFire we'll have to trap into the kernel mode anyway,
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so trap from the library rather then from the kernel wrapper. */
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#ifdef SHARED
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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/* Use temporary variables to workaround call-clobberness of */ \
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/* the registers. */ \
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__typeof (mem) _mem = mem; \
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__typeof (oldval) _oldval = oldval; \
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__typeof (newval) _newval = newval; \
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register __typeof (mem) _a0 asm ("a0") = _mem; \
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register __typeof (oldval) _d0 asm ("d0") = _oldval; \
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register __typeof (newval) _d1 asm ("d1") = _newval; \
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void *tmp; \
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\
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asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %2\n\t" \
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"lea (-6, %%pc, %2), %2\n\t" \
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"movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_cmpxchg_32) \
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"@GOT(%2), %2\n\t" \
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"movel (%2), %2\n\t" \
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"jsr (%2)\n\t" \
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: "+d" (_d0), "+m" (*_a0), "=&a" (tmp) \
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: "a" (_a0), "d" (_d1)); \
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_d0; \
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})
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#else
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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({ \
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/* Use temporary variables to workaround call-clobberness of */ \
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/* the registers. */ \
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__typeof (mem) _mem = mem; \
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__typeof (oldval) _oldval = oldval; \
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__typeof (newval) _newval = newval; \
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register __typeof (oldval) _d0 asm ("d0") \
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= SYS_ify (atomic_cmpxchg_32); \
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register __typeof (mem) _a0 asm ("a0") = _mem; \
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register __typeof (oldval) _d2 asm ("d2") = _oldval; \
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register __typeof (newval) _d1 asm ("d1") = _newval; \
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\
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asm ("trap #0" \
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: "+d" (_d0), "+m" (*_a0) \
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: "a" (_a0), "d" (_d2), "d" (_d1)); \
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_d0; \
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})
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#endif
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#ifdef SHARED
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# define atomic_full_barrier() \
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({ \
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void *tmp; \
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\
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asm ("movel #_GLOBAL_OFFSET_TABLE_@GOTPC, %0\n\t" \
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"lea (-6, %pc, %0), %0\n\t" \
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"movel " STR_M68K_VDSO_SYMBOL (__vdso_atomic_barrier) \
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"@GOT(%0), %0\n\t" \
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"movel (%0), %0\n\t" \
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"jsr (%0)\n\t" \
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: "=&a" (tmp)); \
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})
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#else
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# define atomic_full_barrier() \
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(INTERNAL_SYSCALL (atomic_barrier, , 0), (void) 0)
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#endif
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#endif
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