/* Atomic operations. PowerPC Common version. Copyright (C) 2003-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Mackerras , 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 . */ /* * 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 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) #define __arch_compare_and_exchange_bool_8_rel(mem, newval, oldval) \ (abort (), 0) #define __arch_compare_and_exchange_bool_16_rel(mem, newval, oldval) \ (abort (), 0) #ifdef UP # define __ARCH_ACQ_INSTR "" # define __ARCH_REL_INSTR "" #else # define __ARCH_ACQ_INSTR "isync" # ifndef __ARCH_REL_INSTR # define __ARCH_REL_INSTR "sync" # endif #endif #ifndef MUTEX_HINT_ACQ # define MUTEX_HINT_ACQ #endif #ifndef MUTEX_HINT_REL # define MUTEX_HINT_REL #endif #define atomic_full_barrier() __asm ("sync" ::: "memory") #define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __tmp; \ __typeof (mem) __memp = (mem); \ __asm __volatile ( \ "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\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_compare_and_exchange_val_32_rel(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __tmp; \ __typeof (mem) __memp = (mem); \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: lwarx %0,0,%1" MUTEX_HINT_REL "\n" \ " cmpw %0,%2\n" \ " bne 2f\n" \ " stwcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " \ : "=&r" (__tmp) \ : "b" (__memp), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp; \ }) #define __arch_atomic_exchange_32_acq(mem, value) \ ({ \ __typeof (*mem) __val; \ __asm __volatile ( \ "1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \ " stwcx. %3,0,%2\n" \ " bne- 1b\n" \ " " __ARCH_ACQ_INSTR \ : "=&r" (__val), "=m" (*mem) \ : "b" (mem), "r" (value), "m" (*mem) \ : "cr0", "memory"); \ __val; \ }) #define __arch_atomic_exchange_32_rel(mem, value) \ ({ \ __typeof (*mem) __val; \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: lwarx %0,0,%2" MUTEX_HINT_REL "\n" \ " stwcx. %3,0,%2\n" \ " bne- 1b" \ : "=&r" (__val), "=m" (*mem) \ : "b" (mem), "r" (value), "m" (*mem) \ : "cr0", "memory"); \ __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), "m" (*mem) \ : "cr0", "memory"); \ __val; \ }) #define __arch_atomic_increment_val_32(mem) \ ({ \ __typeof (*(mem)) __val; \ __asm __volatile ("1: lwarx %0,0,%2\n" \ " addi %0,%0,1\n" \ " stwcx. %0,0,%2\n" \ " bne- 1b" \ : "=&b" (__val), "=m" (*mem) \ : "b" (mem), "m" (*mem) \ : "cr0", "memory"); \ __val; \ }) #define __arch_atomic_decrement_val_32(mem) \ ({ \ __typeof (*(mem)) __val; \ __asm __volatile ("1: lwarx %0,0,%2\n" \ " subi %0,%0,1\n" \ " stwcx. %0,0,%2\n" \ " bne- 1b" \ : "=&b" (__val), "=m" (*mem) \ : "b" (mem), "m" (*mem) \ : "cr0", "memory"); \ __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), "m" (*mem) \ : "cr0", "memory"); \ __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_compare_and_exchange_val_rel(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __result; \ if (sizeof (*mem) == 4) \ __result = __arch_compare_and_exchange_val_32_rel(mem, newval, oldval); \ else if (sizeof (*mem) == 8) \ __result = __arch_compare_and_exchange_val_64_rel(mem, newval, oldval); \ else \ abort (); \ __result; \ }) #define atomic_exchange_acq(mem, value) \ ({ \ __typeof (*(mem)) __result; \ if (sizeof (*mem) == 4) \ __result = __arch_atomic_exchange_32_acq (mem, value); \ else if (sizeof (*mem) == 8) \ __result = __arch_atomic_exchange_64_acq (mem, value); \ else \ abort (); \ __result; \ }) #define atomic_exchange_rel(mem, value) \ ({ \ __typeof (*(mem)) __result; \ if (sizeof (*mem) == 4) \ __result = __arch_atomic_exchange_32_rel (mem, value); \ else if (sizeof (*mem) == 8) \ __result = __arch_atomic_exchange_64_rel (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; \ }) #define atomic_increment_val(mem) \ ({ \ __typeof (*(mem)) __result; \ if (sizeof (*(mem)) == 4) \ __result = __arch_atomic_increment_val_32 (mem); \ else if (sizeof (*(mem)) == 8) \ __result = __arch_atomic_increment_val_64 (mem); \ else \ abort (); \ __result; \ }) #define atomic_increment(mem) ({ atomic_increment_val (mem); (void) 0; }) #define atomic_decrement_val(mem) \ ({ \ __typeof (*(mem)) __result; \ if (sizeof (*(mem)) == 4) \ __result = __arch_atomic_decrement_val_32 (mem); \ else if (sizeof (*(mem)) == 8) \ __result = __arch_atomic_decrement_val_64 (mem); \ else \ abort (); \ __result; \ }) #define atomic_decrement(mem) ({ atomic_decrement_val (mem); (void) 0; }) /* 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; \ })