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Rewrite MIPS' atomic.h to use __atomic_* builtins.
This commit is contained in:
Maxim Kuvyrkov
parent
71220acad5
commit
a766fb45a3
@ -1,3 +1,20 @@
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2012-07-11 Tom de Vries <vries@codesourcery.com>
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Maxim Kuvyrkov <maxim@codesourcery.com>
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* sysdeps/mips/bits/atomic.h [__GNUC_PREREQ (4, 8)]
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(__arch_compare_and_exchange_bool_32_int)
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(__arch_compare_and_exchange_val_32_int)
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(__arch_compare_and_exchange_bool_64_int)
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(__arch_compare_and_exchange_val_64_int)
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Define in terms of __atomic_compare_exchange_n.
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[__GNUC_PREREQ (4, 8)]
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(__arch_exchange_32_int, __arch_exchange_64_int):
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Define in terms of __atomic_exchange_n.
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[__GNUC_PREREQ (4, 8)]
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(__arch_exchange_and_add_32_int, __arch_exchange_and_add_64_int):
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Define in terms of __atomic_fetch_add.
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[!__GNUC_PREREQ (4, 8)]: Update formatting.
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2012-07-06 Petar Jovanovic <petar.jovanovic@rt-rk.com>
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* sysdeps/mips/dl-machine.h (RTLD_START): Do not store data below
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@ -1,5 +1,5 @@
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/* Low-level functions for atomic operations. Mips version.
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Copyright (C) 2005 Free Software Foundation, Inc.
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Copyright (C) 2005-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -78,17 +78,141 @@ typedef uintmax_t uatomic_max_t;
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#define MIPS_SYNC_STR_1(X) MIPS_SYNC_STR_2(X)
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#define MIPS_SYNC_STR MIPS_SYNC_STR_1(MIPS_SYNC)
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#if __GNUC_PREREQ (4, 8)
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/* The __atomic_* builtins are available in GCC 4.7 and later, but MIPS
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support for their efficient implementation was added only in GCC 4.8. */
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/* Compare and exchange.
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For all "bool" routines, we return FALSE if exchange succesful. */
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# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
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(abort (), 0)
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# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
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(abort (), 0)
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# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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!__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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})
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# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
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({ \
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typeof (*mem) __oldval = (oldval); \
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__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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model, __ATOMIC_RELAXED); \
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__oldval; \
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})
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
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(abort (), 0)
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# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
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(abort (), (typeof(*mem)) 0)
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# else
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# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
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__arch_compare_and_exchange_bool_32_int (mem, newval, oldval, model)
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# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
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__arch_compare_and_exchange_val_32_int (mem, newval, oldval, model)
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# endif
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/* Compare and exchange with "acquire" semantics, ie barrier after. */
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# define atomic_compare_and_exchange_bool_acq(mem, new, old) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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mem, new, old, __ATOMIC_ACQUIRE)
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# define atomic_compare_and_exchange_val_acq(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, __ATOMIC_ACQUIRE)
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/* Compare and exchange with "release" semantics, ie barrier before. */
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# define atomic_compare_and_exchange_bool_rel(mem, new, old) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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mem, new, old, __ATOMIC_RELEASE)
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# define atomic_compare_and_exchange_val_rel(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, __ATOMIC_RELEASE)
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/* Atomic exchange (without compare). */
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# define __arch_exchange_8_int(mem, newval, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_exchange_16_int(mem, newval, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_exchange_32_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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# define __arch_exchange_64_int(mem, newval, model) \
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(abort (), (typeof(*mem)) 0)
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# else
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# define __arch_exchange_64_int(mem, newval, model) \
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__atomic_exchange_n (mem, newval, model)
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# endif
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# define atomic_exchange_acq(mem, value) \
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__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
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# define atomic_exchange_rel(mem, value) \
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__atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
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/* Atomically add value and return the previous (unincremented) value. */
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# define __arch_exchange_and_add_8_int(mem, value, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_exchange_and_add_16_int(mem, value, model) \
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(abort (), (typeof(*mem)) 0)
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# define __arch_exchange_and_add_32_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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# define __arch_exchange_and_add_64_int(mem, value, model) \
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(abort (), (typeof(*mem)) 0)
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# else
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# define __arch_exchange_and_add_64_int(mem, value, model) \
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__atomic_fetch_add (mem, value, model)
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# endif
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/* ??? Barrier semantics for atomic_exchange_and_add appear to be
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undefined. Use full barrier for now, as that's safe. */
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# define atomic_exchange_and_add(mem, value) \
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__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
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__ATOMIC_ACQ_REL)
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#else /* !__GNUC_PREREQ (4, 8) */
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/* This implementation using inline assembly will be removed once glibc
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requires GCC 4.8 or later to build. */
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/* Compare and exchange. For all of the "xxx" routines, we expect a
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"__prev" and a "__cmp" variable to be provided by the enclosing scope,
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in which values are returned. */
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#define __arch_compare_and_exchange_xxx_8_int(mem, newval, oldval, rel, acq) \
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# define __arch_compare_and_exchange_xxx_8_int(mem, newval, oldval, rel, acq) \
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(abort (), __prev = __cmp = 0)
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#define __arch_compare_and_exchange_xxx_16_int(mem, newval, oldval, rel, acq) \
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# define __arch_compare_and_exchange_xxx_16_int(mem, newval, oldval, rel, acq) \
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(abort (), __prev = __cmp = 0)
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#define __arch_compare_and_exchange_xxx_32_int(mem, newval, oldval, rel, acq) \
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# define __arch_compare_and_exchange_xxx_32_int(mem, newval, oldval, rel, acq) \
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__asm__ __volatile__ ( \
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".set push\n\t" \
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MIPS_PUSH_MIPS2 \
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@ -107,12 +231,12 @@ typedef uintmax_t uatomic_max_t;
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: "r" (oldval), "r" (newval), "m" (*mem) \
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: "memory")
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#if _MIPS_SIM == _ABIO32
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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#define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \
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# define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \
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(abort (), __prev = __cmp = 0)
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#else
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#define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \
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# else
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# define __arch_compare_and_exchange_xxx_64_int(mem, newval, oldval, rel, acq) \
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__asm__ __volatile__ ("\n" \
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".set push\n\t" \
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MIPS_PUSH_MIPS2 \
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@ -130,26 +254,26 @@ typedef uintmax_t uatomic_max_t;
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: "=&r" (__prev), "=&r" (__cmp), "=m" (*mem) \
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: "r" (oldval), "r" (newval), "m" (*mem) \
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: "memory")
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#endif
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# endif
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/* For all "bool" routines, we return FALSE if exchange succesful. */
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#define __arch_compare_and_exchange_bool_8_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_bool_8_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_8_int(mem, new, old, rel, acq); \
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!__cmp; })
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#define __arch_compare_and_exchange_bool_16_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_bool_16_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_16_int(mem, new, old, rel, acq); \
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!__cmp; })
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#define __arch_compare_and_exchange_bool_32_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_bool_32_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_32_int(mem, new, old, rel, acq); \
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!__cmp; })
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#define __arch_compare_and_exchange_bool_64_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_bool_64_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_64_int(mem, new, old, rel, acq); \
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!__cmp; })
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@ -157,43 +281,43 @@ typedef uintmax_t uatomic_max_t;
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/* For all "val" routines, return the old value whether exchange
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successful or not. */
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#define __arch_compare_and_exchange_val_8_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_val_8_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_8_int(mem, new, old, rel, acq); \
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(typeof (*mem))__prev; })
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#define __arch_compare_and_exchange_val_16_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_val_16_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_16_int(mem, new, old, rel, acq); \
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(typeof (*mem))__prev; })
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#define __arch_compare_and_exchange_val_32_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_val_32_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_32_int(mem, new, old, rel, acq); \
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(typeof (*mem))__prev; })
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#define __arch_compare_and_exchange_val_64_int(mem, new, old, rel, acq) \
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# define __arch_compare_and_exchange_val_64_int(mem, new, old, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__arch_compare_and_exchange_xxx_64_int(mem, new, old, rel, acq); \
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(typeof (*mem))__prev; })
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/* Compare and exchange with "acquire" semantics, ie barrier after. */
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#define atomic_compare_and_exchange_bool_acq(mem, new, old) \
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# define atomic_compare_and_exchange_bool_acq(mem, new, old) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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mem, new, old, "", MIPS_SYNC_STR)
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#define atomic_compare_and_exchange_val_acq(mem, new, old) \
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# define atomic_compare_and_exchange_val_acq(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, "", MIPS_SYNC_STR)
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/* Compare and exchange with "release" semantics, ie barrier before. */
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#define atomic_compare_and_exchange_bool_rel(mem, new, old) \
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# define atomic_compare_and_exchange_bool_rel(mem, new, old) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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mem, new, old, MIPS_SYNC_STR, "")
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#define atomic_compare_and_exchange_val_rel(mem, new, old) \
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# define atomic_compare_and_exchange_val_rel(mem, new, old) \
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__atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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mem, new, old, MIPS_SYNC_STR, "")
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@ -201,13 +325,13 @@ typedef uintmax_t uatomic_max_t;
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/* Atomic exchange (without compare). */
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#define __arch_exchange_xxx_8_int(mem, newval, rel, acq) \
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(abort (), 0)
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# define __arch_exchange_xxx_8_int(mem, newval, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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#define __arch_exchange_xxx_16_int(mem, newval, rel, acq) \
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(abort (), 0)
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# define __arch_exchange_xxx_16_int(mem, newval, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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#define __arch_exchange_xxx_32_int(mem, newval, rel, acq) \
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# define __arch_exchange_xxx_32_int(mem, newval, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__asm__ __volatile__ ("\n" \
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".set push\n\t" \
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@ -226,12 +350,12 @@ typedef uintmax_t uatomic_max_t;
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: "memory"); \
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__prev; })
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#if _MIPS_SIM == _ABIO32
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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#define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \
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(abort (), 0)
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#else
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#define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \
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# define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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# else
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# define __arch_exchange_xxx_64_int(mem, newval, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__asm__ __volatile__ ("\n" \
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".set push\n\t" \
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@ -249,24 +373,24 @@ typedef uintmax_t uatomic_max_t;
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: "r" (newval), "m" (*mem) \
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: "memory"); \
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__prev; })
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#endif
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# endif
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#define atomic_exchange_acq(mem, value) \
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# define atomic_exchange_acq(mem, value) \
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__atomic_val_bysize (__arch_exchange_xxx, int, mem, value, "", MIPS_SYNC_STR)
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#define atomic_exchange_rel(mem, value) \
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# define atomic_exchange_rel(mem, value) \
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__atomic_val_bysize (__arch_exchange_xxx, int, mem, value, MIPS_SYNC_STR, "")
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/* Atomically add value and return the previous (unincremented) value. */
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#define __arch_exchange_and_add_8_int(mem, newval, rel, acq) \
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# define __arch_exchange_and_add_8_int(mem, newval, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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#define __arch_exchange_and_add_16_int(mem, newval, rel, acq) \
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# define __arch_exchange_and_add_16_int(mem, newval, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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#define __arch_exchange_and_add_32_int(mem, value, rel, acq) \
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# define __arch_exchange_and_add_32_int(mem, value, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__asm__ __volatile__ ("\n" \
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".set push\n\t" \
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@ -285,12 +409,12 @@ typedef uintmax_t uatomic_max_t;
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: "memory"); \
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__prev; })
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#if _MIPS_SIM == _ABIO32
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# if _MIPS_SIM == _ABIO32
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/* We can't do an atomic 64-bit operation in O32. */
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#define __arch_exchange_and_add_64_int(mem, value, rel, acq) \
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# define __arch_exchange_and_add_64_int(mem, value, rel, acq) \
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(abort (), (typeof(*mem)) 0)
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#else
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#define __arch_exchange_and_add_64_int(mem, value, rel, acq) \
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# else
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# define __arch_exchange_and_add_64_int(mem, value, rel, acq) \
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({ typeof (*mem) __prev; int __cmp; \
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__asm__ __volatile__ ( \
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".set push\n\t" \
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@ -308,13 +432,14 @@ typedef uintmax_t uatomic_max_t;
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: "r" (value), "m" (*mem) \
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: "memory"); \
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__prev; })
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#endif
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# endif
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/* ??? Barrier semantics for atomic_exchange_and_add appear to be
|
||||
undefined. Use full barrier for now, as that's safe. */
|
||||
#define atomic_exchange_and_add(mem, value) \
|
||||
# define atomic_exchange_and_add(mem, value) \
|
||||
__atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
|
||||
MIPS_SYNC_STR, MIPS_SYNC_STR)
|
||||
#endif /* __GNUC_PREREQ (4, 8) */
|
||||
|
||||
/* TODO: More atomic operations could be implemented efficiently; only the
|
||||
basic requirements are done. */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user