glibc/sysdeps/s390/atomic-machine.h

/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.

   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>

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;

#define USE_ATOMIC_COMPILER_BUILTINS 0


#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)

#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
  ({ __typeof (mem) __archmem = (mem);					      \
     __typeof (*mem) __archold = (oldval);				      \
     __asm __volatile ("cs %0,%2,%1"					      \
		       : "+d" (__archold), "=Q" (*__archmem)		      \
		       : "d" (newval), "m" (*__archmem) : "cc", "memory" );	      \
     __archold; })

#ifdef __s390x__
# define __HAVE_64B_ATOMICS 1
# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
  ({ __typeof (mem) __archmem = (mem);					      \
     __typeof (*mem) __archold = (oldval);				      \
     __asm __volatile ("csg %0,%2,%1"					      \
		       : "+d" (__archold), "=Q" (*__archmem)		      \
		       : "d" ((long) (newval)), "m" (*__archmem) : "cc", "memory" );    \
     __archold; })
#else
# define __HAVE_64B_ATOMICS 0
/* For 31 bit we do not really need 64-bit compare-and-exchange. We can
   implement them by use of the csd instruction. The straightforward
   implementation causes warnings so we skip the definition for now.  */
# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
  (abort (), (__typeof (*mem)) 0)
#endif

/* Store NEWVALUE in *MEM and return the old value.  */
/* On s390, the atomic_exchange_acq is different from generic implementation,
   because the generic one does not use the condition-code of cs-instruction
   to determine if looping is needed. Instead it saves the old-value and
   compares it against old-value returned by cs-instruction.  */
#ifdef __s390x__
# define atomic_exchange_acq(mem, newvalue)				\
  ({ __typeof (mem) __atg5_memp = (mem);				\
    __typeof (*(mem)) __atg5_oldval = *__atg5_memp;			\
    __typeof (*(mem)) __atg5_value = (newvalue);			\
    if (sizeof (*mem) == 4)						\
      __asm __volatile ("0: cs %0,%2,%1\n"				\
			"   jl 0b"					\
			: "+d" (__atg5_oldval), "=Q" (*__atg5_memp)	\
			: "d" (__atg5_value), "m" (*__atg5_memp)	\
			: "cc", "memory" );				\
     else if (sizeof (*mem) == 8)					\
       __asm __volatile ("0: csg %0,%2,%1\n"				\
			 "   jl 0b"					\
			 : "+d" ( __atg5_oldval), "=Q" (*__atg5_memp)	\
			 : "d" ((long) __atg5_value), "m" (*__atg5_memp) \
			 : "cc", "memory" );				\
     else								\
       abort ();							\
     __atg5_oldval; })
#else
# define atomic_exchange_acq(mem, newvalue)				\
  ({ __typeof (mem) __atg5_memp = (mem);				\
    __typeof (*(mem)) __atg5_oldval = *__atg5_memp;			\
    __typeof (*(mem)) __atg5_value = (newvalue);			\
    if (sizeof (*mem) == 4)						\
      __asm __volatile ("0: cs %0,%2,%1\n"				\
			"   jl 0b"					\
			: "+d" (__atg5_oldval), "=Q" (*__atg5_memp)	\
			: "d" (__atg5_value), "m" (*__atg5_memp)	\
			: "cc", "memory" );				\
    else								\
      abort ();								\
    __atg5_oldval; })
#endif