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/* Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <tls.h> /* For tcbhead_t. */
#include <libc-internal.h>
typedef int8_t atomic8_t;
typedef uint8_t uatomic8_t;
typedef int_fast8_t atomic_fast8_t;
typedef uint_fast8_t uatomic_fast8_t;
typedef int16_t atomic16_t;
typedef uint16_t uatomic16_t;
typedef int_fast16_t atomic_fast16_t;
typedef uint_fast16_t uatomic_fast16_t;
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
#ifndef LOCK_PREFIX
# ifdef UP
# define LOCK_PREFIX /* nothing */
# else
# define LOCK_PREFIX "lock;"
# endif
#endif
#define __HAVE_64B_ATOMICS 1
#define USE_ATOMIC_COMPILER_BUILTINS 1
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
__sync_val_compare_and_swap (mem, oldval, newval)
#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
(! __sync_bool_compare_and_swap (mem, oldval, newval))
#define __arch_c_compare_and_exchange_val_8_acq(mem, newval, oldval) \
({ __typeof (*mem) ret; \
__asm __volatile ("cmpl $0, %%fs:%P5\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgb %b2, %1" \
: "=a" (ret), "=m" (*mem) \
: "q" (newval), "m" (*mem), "0" (oldval), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
ret; })
#define __arch_c_compare_and_exchange_val_16_acq(mem, newval, oldval) \
({ __typeof (*mem) ret; \
__asm __volatile ("cmpl $0, %%fs:%P5\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgw %w2, %1" \
: "=a" (ret), "=m" (*mem) \
: "q" (newval), "m" (*mem), "0" (oldval), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
ret; })
#define __arch_c_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ __typeof (*mem) ret; \
__asm __volatile ("cmpl $0, %%fs:%P5\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %2, %1" \
: "=a" (ret), "=m" (*mem) \
: "q" (newval), "m" (*mem), "0" (oldval), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
ret; })
#define __arch_c_compare_and_exchange_val_64_acq(mem, newval, oldval) \
({ __typeof (*mem) ret; \
__asm __volatile ("cmpl $0, %%fs:%P5\n\t" \
"je 0f\n\t" \
"lock\n" \
"0:\tcmpxchgq %q2, %1" \
: "=a" (ret), "=m" (*mem) \
: "q" ((atomic64_t) cast_to_integer (newval)), \
"m" (*mem), \
"0" ((atomic64_t) cast_to_integer (oldval)), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
ret; })
/* Note that we need no lock prefix. */
#define atomic_exchange_acq(mem, newvalue) \
({ __typeof (*mem) result; \
if (sizeof (*mem) == 1) \
__asm __volatile ("xchgb %b0, %1" \
: "=q" (result), "=m" (*mem) \
: "0" (newvalue), "m" (*mem)); \
else if (sizeof (*mem) == 2) \
__asm __volatile ("xchgw %w0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" (newvalue), "m" (*mem)); \
else if (sizeof (*mem) == 4) \
__asm __volatile ("xchgl %0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" (newvalue), "m" (*mem)); \
else \
__asm __volatile ("xchgq %q0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" ((atomic64_t) cast_to_integer (newvalue)), \
"m" (*mem)); \
result; })
#define __arch_exchange_and_add_body(lock, mem, value) \
({ __typeof (*mem) result; \
if (sizeof (*mem) == 1) \
__asm __volatile (lock "xaddb %b0, %1" \
: "=q" (result), "=m" (*mem) \
: "0" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "xaddw %w0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "xaddl %0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "xaddq %q0, %1" \
: "=r" (result), "=m" (*mem) \
: "0" ((atomic64_t) cast_to_integer (value)), \
"m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
result; })
#define atomic_exchange_and_add(mem, value) \
__sync_fetch_and_add (mem, value)
#define __arch_exchange_and_add_cprefix \
"cmpl $0, %%fs:%P4\n\tje 0f\n\tlock\n0:\t"
#define catomic_exchange_and_add(mem, value) \
__arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, mem, value)
#define __arch_add_body(lock, pfx, mem, value) \
do { \
if (__builtin_constant_p (value) && (value) == 1) \
pfx##_increment (mem); \
else if (__builtin_constant_p (value) && (value) == -1) \
pfx##_decrement (mem); \
else if (sizeof (*mem) == 1) \
__asm __volatile (lock "addb %b1, %0" \
: "=m" (*mem) \
: "iq" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "addw %w1, %0" \
: "=m" (*mem) \
: "ir" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "addl %1, %0" \
: "=m" (*mem) \
: "ir" (value), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "addq %q1, %0" \
: "=m" (*mem) \
: "ir" ((atomic64_t) cast_to_integer (value)), \
"m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
} while (0)
#define atomic_add(mem, value) \
__arch_add_body (LOCK_PREFIX, atomic, mem, value)
#define __arch_add_cprefix \
"cmpl $0, %%fs:%P3\n\tje 0f\n\tlock\n0:\t"
#define catomic_add(mem, value) \
__arch_add_body (__arch_add_cprefix, catomic, mem, value)
#define atomic_add_negative(mem, value) \
({ unsigned char __result; \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "addb %b2, %0; sets %1" \
: "=m" (*mem), "=qm" (__result) \
: "iq" (value), "m" (*mem)); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "addw %w2, %0; sets %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" (value), "m" (*mem)); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "addl %2, %0; sets %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" (value), "m" (*mem)); \
else \
__asm __volatile (LOCK_PREFIX "addq %q2, %0; sets %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" ((atomic64_t) cast_to_integer (value)), \
"m" (*mem)); \
__result; })
#define atomic_add_zero(mem, value) \
({ unsigned char __result; \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "addb %b2, %0; setz %1" \
: "=m" (*mem), "=qm" (__result) \
: "iq" (value), "m" (*mem)); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "addw %w2, %0; setz %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" (value), "m" (*mem)); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "addl %2, %0; setz %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" (value), "m" (*mem)); \
else \
__asm __volatile (LOCK_PREFIX "addq %q2, %0; setz %1" \
: "=m" (*mem), "=qm" (__result) \
: "ir" ((atomic64_t) cast_to_integer (value)), \
"m" (*mem)); \
__result; })
#define __arch_increment_body(lock, mem) \
do { \
if (sizeof (*mem) == 1) \
__asm __volatile (lock "incb %b0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "incw %w0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "incl %0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "incq %q0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
} while (0)
#define atomic_increment(mem) __arch_increment_body (LOCK_PREFIX, mem)
#define __arch_increment_cprefix \
"cmpl $0, %%fs:%P2\n\tje 0f\n\tlock\n0:\t"
#define catomic_increment(mem) \
__arch_increment_body (__arch_increment_cprefix, mem)
#define atomic_increment_and_test(mem) \
({ unsigned char __result; \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "incb %b0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "incw %w0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "incl %0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else \
__asm __volatile (LOCK_PREFIX "incq %q0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
__result; })
#define __arch_decrement_body(lock, mem) \
do { \
if (sizeof (*mem) == 1) \
__asm __volatile (lock "decb %b0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "decw %w0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "decl %0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "decq %q0" \
: "=m" (*mem) \
: "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
} while (0)
#define atomic_decrement(mem) __arch_decrement_body (LOCK_PREFIX, mem)
#define __arch_decrement_cprefix \
"cmpl $0, %%fs:%P2\n\tje 0f\n\tlock\n0:\t"
#define catomic_decrement(mem) \
__arch_decrement_body (__arch_decrement_cprefix, mem)
#define atomic_decrement_and_test(mem) \
({ unsigned char __result; \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "decb %b0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "decw %w0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "decl %0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
else \
__asm __volatile (LOCK_PREFIX "decq %q0; sete %1" \
: "=m" (*mem), "=qm" (__result) \
: "m" (*mem)); \
__result; })
#define atomic_bit_set(mem, bit) \
do { \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "orb %b2, %0" \
: "=m" (*mem) \
: "m" (*mem), "iq" (1L << (bit))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "orw %w2, %0" \
: "=m" (*mem) \
: "m" (*mem), "ir" (1L << (bit))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "orl %2, %0" \
: "=m" (*mem) \
: "m" (*mem), "ir" (1L << (bit))); \
else if (__builtin_constant_p (bit) && (bit) < 32) \
__asm __volatile (LOCK_PREFIX "orq %2, %0" \
: "=m" (*mem) \
: "m" (*mem), "i" (1L << (bit))); \
else \
__asm __volatile (LOCK_PREFIX "orq %q2, %0" \
: "=m" (*mem) \
: "m" (*mem), "r" (1UL << (bit))); \
} while (0)
#define atomic_bit_test_set(mem, bit) \
({ unsigned char __result; \
if (sizeof (*mem) == 1) \
__asm __volatile (LOCK_PREFIX "btsb %3, %1; setc %0" \
: "=q" (__result), "=m" (*mem) \
: "m" (*mem), "iq" (bit)); \
else if (sizeof (*mem) == 2) \
__asm __volatile (LOCK_PREFIX "btsw %3, %1; setc %0" \
: "=q" (__result), "=m" (*mem) \
: "m" (*mem), "ir" (bit)); \
else if (sizeof (*mem) == 4) \
__asm __volatile (LOCK_PREFIX "btsl %3, %1; setc %0" \
: "=q" (__result), "=m" (*mem) \
: "m" (*mem), "ir" (bit)); \
else \
__asm __volatile (LOCK_PREFIX "btsq %3, %1; setc %0" \
: "=q" (__result), "=m" (*mem) \
: "m" (*mem), "ir" (bit)); \
__result; })
#define atomic_spin_nop() asm ("rep; nop")
#define __arch_and_body(lock, mem, mask) \
do { \
if (sizeof (*mem) == 1) \
__asm __volatile (lock "andb %b1, %0" \
: "=m" (*mem) \
: "iq" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "andw %w1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "andl %1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "andq %q1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
} while (0)
#define __arch_cprefix \
"cmpl $0, %%fs:%P3\n\tje 0f\n\tlock\n0:\t"
#define atomic_and(mem, mask) __arch_and_body (LOCK_PREFIX, mem, mask)
#define catomic_and(mem, mask) __arch_and_body (__arch_cprefix, mem, mask)
#define __arch_or_body(lock, mem, mask) \
do { \
if (sizeof (*mem) == 1) \
__asm __volatile (lock "orb %b1, %0" \
: "=m" (*mem) \
: "iq" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 2) \
__asm __volatile (lock "orw %w1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else if (sizeof (*mem) == 4) \
__asm __volatile (lock "orl %1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
else \
__asm __volatile (lock "orq %q1, %0" \
: "=m" (*mem) \
: "ir" (mask), "m" (*mem), \
"i" (offsetof (tcbhead_t, multiple_threads))); \
} while (0)
#define atomic_or(mem, mask) __arch_or_body (LOCK_PREFIX, mem, mask)
#define catomic_or(mem, mask) __arch_or_body (__arch_cprefix, mem, mask)
/* We don't use mfence because it is supposedly slower due to having to
provide stronger guarantees (e.g., regarding self-modifying code). */
#define atomic_full_barrier() \
__asm __volatile (LOCK_PREFIX "orl $0, (%%rsp)" ::: "memory")
#define atomic_read_barrier() __asm ("" ::: "memory")
#define atomic_write_barrier() __asm ("" ::: "memory")
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