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/* Atomic operations. PowerPC Common version.
Copyright (C) 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/*
* Never include sysdeps/powerpc/bits/atomic.h directly.
* Alway use include/atomic.h which will include either
* sysdeps/powerpc/powerpc32/bits/atomic.h
* or
* sysdeps/powerpc/powerpc64/bits/atomic.h
* as appropriate and which in turn include this file.
*/
#include <stdint.h>
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;
/*
* Powerpc does not have byte and halfword forms of load and reserve and
* store conditional. So for powerpc we stub out the 8- and 16-bit forms.
*/
#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
(abort (), 0)
#ifdef UP
# define __ARCH_ACQ_INSTR ""
# define __ARCH_REL_INSTR ""
#else
# define __ARCH_ACQ_INSTR "isync"
# define __ARCH_REL_INSTR "sync"
#endif
#define atomic_full_barrier() __asm ("sync" ::: "memory")
#define atomic_write_barrier() __asm ("eieio" ::: "memory")
/*
* XXX At present these have both acquire and release semantics.
* Ultimately we should do separate _acq and _rel versions.
*/
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ \
__typeof (*(mem)) __tmp; \
__typeof (mem) __memp = (mem); \
__asm __volatile (__ARCH_REL_INSTR "\n" \
"1: lwarx %0,0,%1\n" \
" cmpw %0,%2\n" \
" bne 2f\n" \
" stwcx. %3,0,%1\n" \
" bne- 1b\n" \
"2: " __ARCH_ACQ_INSTR \
: "=&r" (__tmp) \
: "b" (__memp), "r" (oldval), "r" (newval) \
: "cr0", "memory"); \
__tmp; \
})
#define __arch_atomic_exchange_32(mem, value) \
({ \
__typeof (*mem) __val; \
__asm __volatile (__ARCH_REL_INSTR "\n" \
"1: lwarx %0,0,%2\n" \
" stwcx. %3,0,%2\n" \
" bne- 1b" \
: "=&r" (__val), "=m" (*mem) \
: "b" (mem), "r" (value), "1" (*mem) \
: "cr0"); \
__val; \
})
#define __arch_atomic_exchange_and_add_32(mem, value) \
({ \
__typeof (*mem) __val, __tmp; \
__asm __volatile ("1: lwarx %0,0,%3\n" \
" add %1,%0,%4\n" \
" stwcx. %1,0,%3\n" \
" bne- 1b" \
: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
: "b" (mem), "r" (value), "2" (*mem) \
: "cr0"); \
__val; \
})
#define __arch_atomic_decrement_if_positive_32(mem) \
({ int __val, __tmp; \
__asm __volatile ("1: lwarx %0,0,%3\n" \
" cmpwi 0,%0,0\n" \
" addi %1,%0,-1\n" \
" ble 2f\n" \
" stwcx. %1,0,%3\n" \
" bne- 1b\n" \
"2: " __ARCH_ACQ_INSTR \
: "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \
: "b" (mem), "2" (*mem) \
: "cr0"); \
__val; \
})
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ \
__typeof (*(mem)) __result; \
if (sizeof (*mem) == 4) \
__result = __arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
else if (sizeof (*mem) == 8) \
__result = __arch_compare_and_exchange_val_64_acq(mem, newval, oldval); \
else \
abort (); \
__result; \
})
#define atomic_exchange(mem, value) \
({ \
__typeof (*(mem)) __result; \
if (sizeof (*mem) == 4) \
__result = __arch_atomic_exchange_32 (mem, value); \
else if (sizeof (*mem) == 8) \
__result = __arch_atomic_exchange_64 (mem, value); \
else \
abort (); \
__result; \
})
#define atomic_exchange_and_add(mem, value) \
({ \
__typeof (*(mem)) __result; \
if (sizeof (*mem) == 4) \
__result = __arch_atomic_exchange_and_add_32 (mem, value); \
else if (sizeof (*mem) == 8) \
__result = __arch_atomic_exchange_and_add_64 (mem, value); \
else \
abort (); \
__result; \
})
/* Decrement *MEM if it is > 0, and return the old value. */
#define atomic_decrement_if_positive(mem) \
({ __typeof (*(mem)) __result; \
if (sizeof (*mem) == 4) \
__result = __arch_atomic_decrement_if_positive_32 (mem); \
else if (sizeof (*mem) == 8) \
__result = __arch_atomic_decrement_if_positive_64 (mem); \
else \
abort (); \
__result; \
})
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