/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "apr_arch_atomic.h" #ifdef USE_ATOMICS_PPC #ifdef PPC405_ERRATA # define PPC405_ERR77_SYNC " sync\n" #else # define PPC405_ERR77_SYNC #endif APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p) { return APR_SUCCESS; } APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem) { return *mem; } APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val) { *mem = val; } APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val) { apr_uint32_t prev, temp; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%3\n" /* load and reserve */ " add %1,%0,%4\n" /* add val and prev */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %1,0,%3\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ : "=&r" (prev), "=&r" (temp), "=m" (*mem) : "b" (mem), "r" (val) : "cc", "memory"); return prev; } APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val) { apr_uint32_t temp; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%2\n" /* load and reserve */ " subf %0,%3,%0\n" /* subtract val */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %0,0,%2\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ : "=&r" (temp), "=m" (*mem) : "b" (mem), "r" (val) : "cc", "memory"); } APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem) { apr_uint32_t prev; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%2\n" /* load and reserve */ " addi %0,%0,1\n" /* add immediate */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %0,0,%2\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ " subi %0,%0,1\n" /* return old value */ : "=&b" (prev), "=m" (*mem) : "b" (mem), "m" (*mem) : "cc", "memory"); return prev; } APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem) { apr_uint32_t prev; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%2\n" /* load and reserve */ " subi %0,%0,1\n" /* subtract immediate */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %0,0,%2\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ : "=&b" (prev), "=m" (*mem) : "b" (mem), "m" (*mem) : "cc", "memory"); return prev; } APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with, apr_uint32_t cmp) { apr_uint32_t prev; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%1\n" /* load and reserve */ " cmpw %0,%3\n" /* compare operands */ " bne- exit_%=\n" /* skip if not equal */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %2,0,%1\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ "exit_%=:\n" /* not equal */ : "=&r" (prev) : "b" (mem), "r" (with), "r" (cmp) : "cc", "memory"); return prev; } APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val) { apr_uint32_t prev; asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%1\n" /* load and reserve */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %2,0,%1\n" /* store new value */ " bne- loop_%=" /* loop if lost */ : "=&r" (prev) : "b" (mem), "r" (val) : "cc", "memory"); return prev; } APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp) { void *prev; #if APR_SIZEOF_VOIDP == 4 asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%1\n" /* load and reserve */ " cmpw %0,%3\n" /* compare operands */ " bne- exit_%=\n" /* skip if not equal */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %2,0,%1\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ "exit_%=:\n" /* not equal */ : "=&r" (prev) : "b" (mem), "r" (with), "r" (cmp) : "cc", "memory"); #elif APR_SIZEOF_VOIDP == 8 asm volatile ("loop_%=:\n" /* lost reservation */ " ldarx %0,0,%1\n" /* load and reserve */ " cmpd %0,%3\n" /* compare operands */ " bne- exit_%=\n" /* skip if not equal */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stdcx. %2,0,%1\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ "exit_%=:\n" /* not equal */ : "=&r" (prev) : "b" (mem), "r" (with), "r" (cmp) : "cc", "memory"); #else #error APR_SIZEOF_VOIDP value not supported #endif return prev; } APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with) { void *prev; #if APR_SIZEOF_VOIDP == 4 asm volatile ("loop_%=:\n" /* lost reservation */ " lwarx %0,0,%1\n" /* load and reserve */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stwcx. %2,0,%1\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ " isync\n" /* memory barrier */ : "=&r" (prev) : "b" (mem), "r" (with) : "cc", "memory"); #elif APR_SIZEOF_VOIDP == 8 asm volatile ("loop_%=:\n" /* lost reservation */ " ldarx %0,0,%1\n" /* load and reserve */ PPC405_ERR77_SYNC /* ppc405 Erratum 77 */ " stdcx. %2,0,%1\n" /* store new value */ " bne- loop_%=\n" /* loop if lost */ " isync\n" /* memory barrier */ : "=&r" (prev) : "b" (mem), "r" (with) : "cc", "memory"); #else #error APR_SIZEOF_VOIDP value not supported #endif return prev; } #endif /* USE_ATOMICS_PPC */
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