/* Atomic operations. PowerPC64 version. Copyright (C) 2003 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* * The 32-bit exchange_bool is different on powerpc64 because the subf * does signed 64-bit arthmatic while the lwarx is 32-bit unsigned * (a load word and zero (high 32) form) load. * In powerpc64 register values are 64-bit by default, including oldval. * Net we need to extend sign word the result of lwarx to 64-bit so the * 64-bit subtract from gives the expected result and sets the condition * correctly. */ # define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \ ({ \ unsigned int __tmp; \ __asm __volatile ( \ "1: lwarx %0,0,%1\n" \ " extsw %0,%0\n" \ " subf. %0,%2,%0\n" \ " bne 2f\n" \ " stwcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " __ARCH_ACQ_INSTR \ : "=&r" (__tmp) \ : "b" (mem), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp != 0; \ }) # define __arch_compare_and_exchange_bool_32_rel(mem, newval, oldval) \ ({ \ unsigned int __tmp; \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: lwarx %0,0,%1\n" \ " extsw %0,%0\n" \ " subf. %0,%2,%0\n" \ " bne 2f\n" \ " stwcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " \ : "=&r" (__tmp) \ : "b" (mem), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp != 0; \ }) /* * Only powerpc64 processors support Load doubleword and reserve index (ldarx) * and Store doubleword conditional indexed (stdcx) instructions. So here * we define the 64-bit forms. */ # define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \ ({ \ unsigned long __tmp; \ __asm __volatile ( \ "1: ldarx %0,0,%1\n" \ " subf. %0,%2,%0\n" \ " bne 2f\n" \ " stdcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " __ARCH_ACQ_INSTR \ : "=&r" (__tmp) \ : "b" (mem), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp != 0; \ }) # define __arch_compare_and_exchange_bool_64_rel(mem, newval, oldval) \ ({ \ unsigned long __tmp; \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: ldarx %0,0,%1\n" \ " subf. %0,%2,%0\n" \ " bne 2f\n" \ " stdcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " \ : "=&r" (__tmp) \ : "b" (mem), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp != 0; \ }) #define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __tmp; \ __typeof (mem) __memp = (mem); \ __asm __volatile ( \ "1: ldarx %0,0,%1\n" \ " cmpd %0,%2\n" \ " bne 2f\n" \ " stdcx. %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_64_rel(mem, newval, oldval) \ ({ \ __typeof (*(mem)) __tmp; \ __typeof (mem) __memp = (mem); \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: ldarx %0,0,%1\n" \ " cmpd %0,%2\n" \ " bne 2f\n" \ " stdcx. %3,0,%1\n" \ " bne- 1b\n" \ "2: " \ : "=&r" (__tmp) \ : "b" (__memp), "r" (oldval), "r" (newval) \ : "cr0", "memory"); \ __tmp; \ }) # define __arch_atomic_exchange_64_acq(mem, value) \ ({ \ __typeof (*mem) __val; \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: ldarx %0,0,%2\n" \ " stdcx. %3,0,%2\n" \ " bne- 1b\n" \ " " __ARCH_ACQ_INSTR \ : "=&r" (__val), "=m" (*mem) \ : "b" (mem), "r" (value), "1" (*mem) \ : "cr0", "memory"); \ __val; \ }) # define __arch_atomic_exchange_64_rel(mem, value) \ ({ \ __typeof (*mem) __val; \ __asm __volatile (__ARCH_REL_INSTR "\n" \ "1: ldarx %0,0,%2\n" \ " stdcx. %3,0,%2\n" \ " bne- 1b" \ : "=&r" (__val), "=m" (*mem) \ : "b" (mem), "r" (value), "1" (*mem) \ : "cr0", "memory"); \ __val; \ }) # define __arch_atomic_exchange_and_add_64(mem, value) \ ({ \ __typeof (*mem) __val, __tmp; \ __asm __volatile ("1: ldarx %0,0,%3\n" \ " add %1,%0,%4\n" \ " stdcx. %1,0,%3\n" \ " bne- 1b" \ : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ : "b" (mem), "r" (value), "2" (*mem) \ : "cr0", "memory"); \ __val; \ }) # define __arch_atomic_decrement_if_positive_64(mem) \ ({ int __val, __tmp; \ __asm __volatile ("1: ldarx %0,0,%3\n" \ " cmpdi 0,%0,0\n" \ " addi %1,%0,-1\n" \ " ble 2f\n" \ " stdcx. %1,0,%3\n" \ " bne- 1b\n" \ "2: " __ARCH_ACQ_INSTR \ : "=&b" (__val), "=&r" (__tmp), "=m" (*mem) \ : "b" (mem), "2" (*mem) \ : "cr0", "memory"); \ __val; \ }) /* * All powerpc64 processors support the new "light weight" sync (lwsync). */ # define atomic_read_barrier() __asm ("lwsync" ::: "memory") /* * "light weight" sync can also be used for the release barrier. */ # ifndef UP # define __ARCH_REL_INSTR "lwsync" # endif /* * Include the rest of the atomic ops macros which are common to both * powerpc32 and powerpc64. */ #include_next