X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=include%2Furcu%2Fuatomic%2Fx86.h;h=b5725e0f7fd5a5203b9a2775a99731bcbc097cc2;hb=d3d3857f678627e7bbfb5a8d6f3bc15cd2a694d9;hp=ec71e5151fa07b4115f5d4b62fce6d7a3e4c30cd;hpb=0b1e236d1711f4f9076f73a093ece05aca00eca4;p=userspace-rcu.git diff --git a/include/urcu/uatomic/x86.h b/include/urcu/uatomic/x86.h index ec71e51..b5725e0 100644 --- a/include/urcu/uatomic/x86.h +++ b/include/urcu/uatomic/x86.h @@ -1,21 +1,14 @@ +// SPDX-FileCopyrightText: 1991-1994 by Xerox Corporation. All rights reserved. +// SPDX-FileCopyrightText: 1996-1999 by Silicon Graphics. All rights reserved. +// SPDX-FileCopyrightText: 1999-2004 Hewlett-Packard Development Company, L.P. +// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers +// +// SPDX-License-Identifier: LicenseRef-Boehm-GC + #ifndef _URCU_ARCH_UATOMIC_X86_H #define _URCU_ARCH_UATOMIC_X86_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. */ @@ -36,10 +29,21 @@ extern "C" { * Derived from AO_compare_and_swap() and AO_test_and_set_full(). */ -struct __uatomic_dummy { - unsigned long v[10]; -}; -#define __hp(x) ((struct __uatomic_dummy *)(x)) +/* + * The __hp() macro casts the void pointer @x to a pointer to a structure + * containing an array of char of the specified size. This allows passing the + * @addr arguments of the following inline functions as "m" and "+m" operands + * to the assembly. The @size parameter should be a constant to support + * compilers such as clang which do not support VLA. Create typedefs because + * C++ does not allow types be defined in casts. + */ + +typedef struct { char v[1]; } __hp_1; +typedef struct { char v[2]; } __hp_2; +typedef struct { char v[4]; } __hp_4; +typedef struct { char v[8]; } __hp_8; + +#define __hp(size, x) ((__hp_##size *)(x)) #define _uatomic_set(addr, v) ((void) CMM_STORE_SHARED(*(addr), (v))) @@ -56,7 +60,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old, __asm__ __volatile__( "lock; cmpxchgb %2, %1" - : "+a"(result), "+m"(*__hp(addr)) + : "+a"(result), "+m"(*__hp(1, addr)) : "q"((unsigned char)_new) : "memory"); return result; @@ -67,7 +71,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old, __asm__ __volatile__( "lock; cmpxchgw %2, %1" - : "+a"(result), "+m"(*__hp(addr)) + : "+a"(result), "+m"(*__hp(2, addr)) : "r"((unsigned short)_new) : "memory"); return result; @@ -78,7 +82,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old, __asm__ __volatile__( "lock; cmpxchgl %2, %1" - : "+a"(result), "+m"(*__hp(addr)) + : "+a"(result), "+m"(*__hp(4, addr)) : "r"((unsigned int)_new) : "memory"); return result; @@ -90,7 +94,7 @@ unsigned long __uatomic_cmpxchg(void *addr, unsigned long old, __asm__ __volatile__( "lock; cmpxchgq %2, %1" - : "+a"(result), "+m"(*__hp(addr)) + : "+a"(result), "+m"(*__hp(8, addr)) : "r"((unsigned long)_new) : "memory"); return result; @@ -123,7 +127,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len) unsigned char result; __asm__ __volatile__( "xchgb %0, %1" - : "=q"(result), "+m"(*__hp(addr)) + : "=q"(result), "+m"(*__hp(1, addr)) : "0" ((unsigned char)val) : "memory"); return result; @@ -133,7 +137,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len) unsigned short result; __asm__ __volatile__( "xchgw %0, %1" - : "=r"(result), "+m"(*__hp(addr)) + : "=r"(result), "+m"(*__hp(2, addr)) : "0" ((unsigned short)val) : "memory"); return result; @@ -143,7 +147,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len) unsigned int result; __asm__ __volatile__( "xchgl %0, %1" - : "=r"(result), "+m"(*__hp(addr)) + : "=r"(result), "+m"(*__hp(4, addr)) : "0" ((unsigned int)val) : "memory"); return result; @@ -154,7 +158,7 @@ unsigned long __uatomic_exchange(void *addr, unsigned long val, int len) unsigned long result; __asm__ __volatile__( "xchgq %0, %1" - : "=r"(result), "+m"(*__hp(addr)) + : "=r"(result), "+m"(*__hp(8, addr)) : "0" ((unsigned long)val) : "memory"); return result; @@ -187,7 +191,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val, __asm__ __volatile__( "lock; xaddb %1, %0" - : "+m"(*__hp(addr)), "+q" (result) + : "+m"(*__hp(1, addr)), "+q" (result) : : "memory"); return result + (unsigned char)val; @@ -198,7 +202,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val, __asm__ __volatile__( "lock; xaddw %1, %0" - : "+m"(*__hp(addr)), "+r" (result) + : "+m"(*__hp(2, addr)), "+r" (result) : : "memory"); return result + (unsigned short)val; @@ -209,7 +213,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val, __asm__ __volatile__( "lock; xaddl %1, %0" - : "+m"(*__hp(addr)), "+r" (result) + : "+m"(*__hp(4, addr)), "+r" (result) : : "memory"); return result + (unsigned int)val; @@ -221,7 +225,7 @@ unsigned long __uatomic_add_return(void *addr, unsigned long val, __asm__ __volatile__( "lock; xaddq %1, %0" - : "+m"(*__hp(addr)), "+r" (result) + : "+m"(*__hp(8, addr)), "+r" (result) : : "memory"); return result + (unsigned long)val; @@ -251,7 +255,7 @@ void __uatomic_and(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; andb %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(1, addr)) : "iq" ((unsigned char)val) : "memory"); return; @@ -260,7 +264,7 @@ void __uatomic_and(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; andw %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(2, addr)) : "ir" ((unsigned short)val) : "memory"); return; @@ -269,7 +273,7 @@ void __uatomic_and(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; andl %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(4, addr)) : "ir" ((unsigned int)val) : "memory"); return; @@ -279,7 +283,7 @@ void __uatomic_and(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; andq %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(8, addr)) : "er" ((unsigned long)val) : "memory"); return; @@ -307,7 +311,7 @@ void __uatomic_or(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; orb %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(1, addr)) : "iq" ((unsigned char)val) : "memory"); return; @@ -316,7 +320,7 @@ void __uatomic_or(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; orw %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(2, addr)) : "ir" ((unsigned short)val) : "memory"); return; @@ -325,7 +329,7 @@ void __uatomic_or(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; orl %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(4, addr)) : "ir" ((unsigned int)val) : "memory"); return; @@ -335,7 +339,7 @@ void __uatomic_or(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; orq %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(8, addr)) : "er" ((unsigned long)val) : "memory"); return; @@ -363,7 +367,7 @@ void __uatomic_add(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; addb %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(1, addr)) : "iq" ((unsigned char)val) : "memory"); return; @@ -372,7 +376,7 @@ void __uatomic_add(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; addw %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(2, addr)) : "ir" ((unsigned short)val) : "memory"); return; @@ -381,7 +385,7 @@ void __uatomic_add(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; addl %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(4, addr)) : "ir" ((unsigned int)val) : "memory"); return; @@ -391,7 +395,7 @@ void __uatomic_add(void *addr, unsigned long val, int len) { __asm__ __volatile__( "lock; addq %1, %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(8, addr)) : "er" ((unsigned long)val) : "memory"); return; @@ -420,7 +424,7 @@ void __uatomic_inc(void *addr, int len) { __asm__ __volatile__( "lock; incb %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(1, addr)) : : "memory"); return; @@ -429,7 +433,7 @@ void __uatomic_inc(void *addr, int len) { __asm__ __volatile__( "lock; incw %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(2, addr)) : : "memory"); return; @@ -438,7 +442,7 @@ void __uatomic_inc(void *addr, int len) { __asm__ __volatile__( "lock; incl %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(4, addr)) : : "memory"); return; @@ -448,7 +452,7 @@ void __uatomic_inc(void *addr, int len) { __asm__ __volatile__( "lock; incq %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(8, addr)) : : "memory"); return; @@ -473,7 +477,7 @@ void __uatomic_dec(void *addr, int len) { __asm__ __volatile__( "lock; decb %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(1, addr)) : : "memory"); return; @@ -482,7 +486,7 @@ void __uatomic_dec(void *addr, int len) { __asm__ __volatile__( "lock; decw %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(2, addr)) : : "memory"); return; @@ -491,7 +495,7 @@ void __uatomic_dec(void *addr, int len) { __asm__ __volatile__( "lock; decl %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(4, addr)) : : "memory"); return; @@ -501,7 +505,7 @@ void __uatomic_dec(void *addr, int len) { __asm__ __volatile__( "lock; decq %0" - : "=m"(*__hp(addr)) + : "=m"(*__hp(8, addr)) : : "memory"); return; @@ -518,7 +522,7 @@ void __uatomic_dec(void *addr, int len) #define _uatomic_dec(addr) (__uatomic_dec((addr), sizeof(*(addr)))) -#if ((CAA_BITS_PER_LONG != 64) && defined(URCU_ARCH_I386)) +#ifdef URCU_ARCH_X86_NO_CAS /* For backwards compat */ #define CONFIG_RCU_COMPAT_ARCH 1