+++ /dev/null
-#ifndef _URCU_ARCH_UATOMIC_PPC_H
-#define _URCU_ARCH_UATOMIC_PPC_H
-
-/*
- * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
- * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
- * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
- * Copyright (c) 2009 Mathieu Desnoyers
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- *
- * Code inspired from libuatomic_ops-1.2, inherited in part from the
- * Boehm-Demers-Weiser conservative garbage collector.
- */
-
-#include <urcu/compiler.h>
-#include <urcu/system.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __NO_LWSYNC__
-#define LWSYNC_OPCODE "sync\n"
-#else
-#define LWSYNC_OPCODE "lwsync\n"
-#endif
-
-#define ILLEGAL_INSTR ".long 0xd00d00"
-
-/*
- * Using a isync as second barrier for exchange to provide acquire semantic.
- * According to uatomic_ops/sysdeps/gcc/powerpc.h, the documentation is "fairly
- * explicit that this also has acquire semantics."
- * Derived from AO_compare_and_swap(), but removed the comparison.
- */
-
-/* xchg */
-
-static inline __attribute__((always_inline))
-unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
-{
- switch (len) {
- case 4:
- {
- unsigned int result;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "lwarx %0,0,%1\n" /* load and reserve */
- "stwcx. %2,0,%1\n" /* else store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- : "=&r"(result)
- : "r"(addr), "r"(val)
- : "memory", "cc");
-
- return result;
- }
-#if (CAA_BITS_PER_LONG == 64)
- case 8:
- {
- unsigned long result;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "ldarx %0,0,%1\n" /* load and reserve */
- "stdcx. %2,0,%1\n" /* else store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- : "=&r"(result)
- : "r"(addr), "r"(val)
- : "memory", "cc");
-
- return result;
- }
-#endif
- }
- /* generate an illegal instruction. Cannot catch this with linker tricks
- * when optimizations are disabled. */
- __asm__ __volatile__(ILLEGAL_INSTR);
- return 0;
-}
-
-#define uatomic_xchg(addr, v) \
- ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
- sizeof(*(addr))))
-/* cmpxchg */
-
-static inline __attribute__((always_inline))
-unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
- unsigned long _new, int len)
-{
- switch (len) {
- case 4:
- {
- unsigned int old_val;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "lwarx %0,0,%1\n" /* load and reserve */
- "cmpw %0,%3\n" /* if load is not equal to */
- "bne 2f\n" /* old, fail */
- "stwcx. %2,0,%1\n" /* else store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- "2:\n"
- : "=&r"(old_val)
- : "r"(addr), "r"((unsigned int)_new),
- "r"((unsigned int)old)
- : "memory", "cc");
-
- return old_val;
- }
-#if (CAA_BITS_PER_LONG == 64)
- case 8:
- {
- unsigned long old_val;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "ldarx %0,0,%1\n" /* load and reserve */
- "cmpd %0,%3\n" /* if load is not equal to */
- "bne 2f\n" /* old, fail */
- "stdcx. %2,0,%1\n" /* else store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- "2:\n"
- : "=&r"(old_val)
- : "r"(addr), "r"((unsigned long)_new),
- "r"((unsigned long)old)
- : "memory", "cc");
-
- return old_val;
- }
-#endif
- }
- /* generate an illegal instruction. Cannot catch this with linker tricks
- * when optimizations are disabled. */
- __asm__ __volatile__(ILLEGAL_INSTR);
- return 0;
-}
-
-
-#define uatomic_cmpxchg(addr, old, _new) \
- ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\
- (unsigned long)(_new), \
- sizeof(*(addr))))
-
-/* uatomic_add_return */
-
-static inline __attribute__((always_inline))
-unsigned long _uatomic_add_return(void *addr, unsigned long val,
- int len)
-{
- switch (len) {
- case 4:
- {
- unsigned int result;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "lwarx %0,0,%1\n" /* load and reserve */
- "add %0,%2,%0\n" /* add val to value loaded */
- "stwcx. %0,0,%1\n" /* store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- : "=&r"(result)
- : "r"(addr), "r"(val)
- : "memory", "cc");
-
- return result;
- }
-#if (CAA_BITS_PER_LONG == 64)
- case 8:
- {
- unsigned long result;
-
- __asm__ __volatile__(
- LWSYNC_OPCODE
- "1:\t" "ldarx %0,0,%1\n" /* load and reserve */
- "add %0,%2,%0\n" /* add val to value loaded */
- "stdcx. %0,0,%1\n" /* store conditional */
- "bne- 1b\n" /* retry if lost reservation */
- "isync\n"
- : "=&r"(result)
- : "r"(addr), "r"(val)
- : "memory", "cc");
-
- return result;
- }
-#endif
- }
- /* generate an illegal instruction. Cannot catch this with linker tricks
- * when optimizations are disabled. */
- __asm__ __volatile__(ILLEGAL_INSTR);
- return 0;
-}
-
-
-#define uatomic_add_return(addr, v) \
- ((__typeof__(*(addr))) _uatomic_add_return((addr), \
- (unsigned long)(v), \
- sizeof(*(addr))))
-
-#ifdef __cplusplus
-}
-#endif
-
-#include <urcu/uatomic_generic.h>
-
-#endif /* _URCU_ARCH_UATOMIC_PPC_H */
projects / urcu.git / blobdiff