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/** @file
* IPRT - Assembly Functions.
*/
/*
* Copyright (C) 2006-2015 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#ifndef ___iprt_asm_h
#define ___iprt_asm_h
#include <iprt/cdefs.h>
#include <iprt/types.h>
#include <iprt/assert.h>
/** @def RT_INLINE_ASM_USES_INTRIN
* Defined as 1 if we're using a _MSC_VER 1400.
* Otherwise defined as 0.
*/
/* Solaris 10 header ugliness */
#ifdef u
# undef u
#endif
#if defined(_MSC_VER) && RT_INLINE_ASM_USES_INTRIN
# include <intrin.h>
/* Emit the intrinsics at all optimization levels. */
# pragma intrinsic(_ReadWriteBarrier)
# pragma intrinsic(__cpuid)
# pragma intrinsic(__stosd)
# pragma intrinsic(__stosw)
# pragma intrinsic(__stosb)
# pragma intrinsic(_BitScanForward)
# pragma intrinsic(_BitScanReverse)
# pragma intrinsic(_bittest)
# pragma intrinsic(_bittestandset)
# pragma intrinsic(_bittestandreset)
# pragma intrinsic(_bittestandcomplement)
# pragma intrinsic(_byteswap_ushort)
# pragma intrinsic(_byteswap_ulong)
# pragma intrinsic(_interlockedbittestandset)
# pragma intrinsic(_interlockedbittestandreset)
# pragma intrinsic(_InterlockedAnd)
# pragma intrinsic(_InterlockedOr)
# pragma intrinsic(_InterlockedIncrement)
# pragma intrinsic(_InterlockedDecrement)
# pragma intrinsic(_InterlockedExchange)
# pragma intrinsic(_InterlockedExchangeAdd)
# pragma intrinsic(_InterlockedCompareExchange)
# pragma intrinsic(_InterlockedCompareExchange64)
# pragma intrinsic(_rotl)
# pragma intrinsic(_rotr)
# pragma intrinsic(_rotl64)
# pragma intrinsic(_rotr64)
# ifdef RT_ARCH_AMD64
# pragma intrinsic(__stosq)
# pragma intrinsic(_byteswap_uint64)
# pragma intrinsic(_InterlockedExchange64)
# pragma intrinsic(_InterlockedExchangeAdd64)
# pragma intrinsic(_InterlockedAnd64)
# pragma intrinsic(_InterlockedOr64)
# pragma intrinsic(_InterlockedIncrement64)
# pragma intrinsic(_InterlockedDecrement64)
# endif
#endif
/** @defgroup grp_rt_asm ASM - Assembly Routines
* @ingroup grp_rt
*
* @remarks The difference between ordered and unordered atomic operations are that
* the former will complete outstanding reads and writes before continuing
* while the latter doesn't make any promises about the order. Ordered
* operations doesn't, it seems, make any 100% promise wrt to whether
* the operation will complete before any subsequent memory access.
* (please, correct if wrong.)
*
* ASMAtomicSomething operations are all ordered, while ASMAtomicUoSomething
* are unordered (note the Uo).
*
* @remarks Some remarks about __volatile__: Without this keyword gcc is allowed to reorder
* or even optimize assembler instructions away. For instance, in the following code
* the second rdmsr instruction is optimized away because gcc treats that instruction
* as deterministic:
*
* @code
* static inline uint64_t rdmsr_low(int idx)
* {
* uint32_t low;
* __asm__ ("rdmsr" : "=a"(low) : "c"(idx) : "edx");
* }
* ...
* uint32_t msr1 = rdmsr_low(1);
* foo(msr1);
* msr1 = rdmsr_low(1);
* bar(msr1);
* @endcode
*
* The input parameter of rdmsr_low is the same for both calls and therefore gcc will
* use the result of the first call as input parameter for bar() as well. For rdmsr this
* is not acceptable as this instruction is _not_ deterministic. This applies to reading
* machine status information in general.
*
* @{
*/
/** @def RT_INLINE_ASM_GCC_4_3_X_X86
* Used to work around some 4.3.x register allocation issues in this version of
* the compiler. So far this workaround is still required for 4.4 and 4.5. */
#ifdef __GNUC__
# define RT_INLINE_ASM_GCC_4_3_X_X86 (__GNUC__ == 4 && __GNUC_MINOR__ >= 3 && defined(__i386__))
#endif
#ifndef RT_INLINE_ASM_GCC_4_3_X_X86
# define RT_INLINE_ASM_GCC_4_3_X_X86 0
#endif
/** @def RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
* i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5493) screws up
* RTSemRWRequestWrite semsemrw-lockless-generic.cpp in release builds. PIC
* mode, x86.
*
* Some gcc 4.3.x versions may have register allocation issues with cmpxchg8b
* when in PIC mode on x86.
*/
#ifndef RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
# ifdef DOXYGEN_RUNNING
# define RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC 1
# else
# define RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC \
( (defined(PIC) || defined(__PIC__)) \
&& defined(RT_ARCH_X86) \
&& ( RT_INLINE_ASM_GCC_4_3_X_X86 \
|| defined(RT_OS_DARWIN)) )
# endif
#endif
/** @def ASMReturnAddress
* Gets the return address of the current (or calling if you like) function or method.
*/
#ifdef _MSC_VER
# ifdef __cplusplus
extern "C"
# endif
void * _ReturnAddress(void);
# pragma intrinsic(_ReturnAddress)
# define ASMReturnAddress() _ReturnAddress()
#elif defined(__GNUC__) || defined(DOXYGEN_RUNNING)
# define ASMReturnAddress() __builtin_return_address(0)
#else
# error "Unsupported compiler."
#endif
/**
* Compiler memory barrier.
*
* Ensure that the compiler does not use any cached (register/tmp stack) memory
* values or any outstanding writes when returning from this function.
*
* This function must be used if non-volatile data is modified by a
* device or the VMM. Typical cases are port access, MMIO access,
* trapping instruction, etc.
*/
#if RT_INLINE_ASM_GNU_STYLE
# define ASMCompilerBarrier() do { __asm__ __volatile__("" : : : "memory"); } while (0)
#elif RT_INLINE_ASM_USES_INTRIN
# define ASMCompilerBarrier() do { _ReadWriteBarrier(); } while (0)
#else /* 2003 should have _ReadWriteBarrier() but I guess we're at 2002 level then... */
DECLINLINE(void) ASMCompilerBarrier(void)
{
__asm
{
}
}
#endif
/** @def ASMBreakpoint
* Debugger Breakpoint.
* @deprecated Use RT_BREAKPOINT instead.
* @internal
*/
#define ASMBreakpoint() RT_BREAKPOINT()
/**
* Spinloop hint for platforms that have these, empty function on the other
* platforms.
*
* x86 & AMD64: The PAUSE variant of NOP for helping hyperthreaded CPUs detecting
* spin locks.
*/
#if RT_INLINE_ASM_EXTERNAL && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
DECLASM(void) ASMNopPause(void);
#else
DECLINLINE(void) ASMNopPause(void)
{
# if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__(".byte 0xf3,0x90\n\t");
# else
__asm {
_emit 0f3h
_emit 090h
}
# endif
# else
/* dummy */
# endif
}
#endif
/**
* Atomically Exchange an unsigned 8-bit value, ordered.
*
* @returns Current *pu8 value
* @param pu8 Pointer to the 8-bit variable to update.
* @param u8 The 8-bit value to assign to *pu8.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8);
#else
DECLINLINE(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("xchgb %0, %1\n\t"
: "=m" (*pu8),
"=q" (u8) /* =r - busted on g++ (GCC) 3.4.4 20050721 (Red Hat 3.4.4-2) */
: "1" (u8),
"m" (*pu8));
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rdx, [pu8]
mov al, [u8]
xchg [rdx], al
mov [u8], al
# else
mov edx, [pu8]
mov al, [u8]
xchg [edx], al
mov [u8], al
# endif
}
# endif
return u8;
}
#endif
/**
* Atomically Exchange a signed 8-bit value, ordered.
*
* @returns Current *pu8 value
* @param pi8 Pointer to the 8-bit variable to update.
* @param i8 The 8-bit value to assign to *pi8.
*/
DECLINLINE(int8_t) ASMAtomicXchgS8(volatile int8_t *pi8, int8_t i8)
{
return (int8_t)ASMAtomicXchgU8((volatile uint8_t *)pi8, (uint8_t)i8);
}
/**
* Atomically Exchange a bool value, ordered.
*
* @returns Current *pf value
* @param pf Pointer to the 8-bit variable to update.
* @param f The 8-bit value to assign to *pi8.
*/
DECLINLINE(bool) ASMAtomicXchgBool(volatile bool *pf, bool f)
{
#ifdef _MSC_VER
return !!ASMAtomicXchgU8((volatile uint8_t *)pf, (uint8_t)f);
#else
return (bool)ASMAtomicXchgU8((volatile uint8_t *)pf, (uint8_t)f);
#endif
}
/**
* Atomically Exchange an unsigned 16-bit value, ordered.
*
* @returns Current *pu16 value
* @param pu16 Pointer to the 16-bit variable to update.
* @param u16 The 16-bit value to assign to *pu16.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16);
#else
DECLINLINE(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("xchgw %0, %1\n\t"
: "=m" (*pu16),
"=r" (u16)
: "1" (u16),
"m" (*pu16));
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rdx, [pu16]
mov ax, [u16]
xchg [rdx], ax
mov [u16], ax
# else
mov edx, [pu16]
mov ax, [u16]
xchg [edx], ax
mov [u16], ax
# endif
}
# endif
return u16;
}
#endif
/**
* Atomically Exchange a signed 16-bit value, ordered.
*
* @returns Current *pu16 value
* @param pi16 Pointer to the 16-bit variable to update.
* @param i16 The 16-bit value to assign to *pi16.
*/
DECLINLINE(int16_t) ASMAtomicXchgS16(volatile int16_t *pi16, int16_t i16)
{
return (int16_t)ASMAtomicXchgU16((volatile uint16_t *)pi16, (uint16_t)i16);
}
/**
* Atomically Exchange an unsigned 32-bit value, ordered.
*
* @returns Current *pu32 value
* @param pu32 Pointer to the 32-bit variable to update.
* @param u32 The 32-bit value to assign to *pu32.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32);
#else
DECLINLINE(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("xchgl %0, %1\n\t"
: "=m" (*pu32),
"=r" (u32)
: "1" (u32),
"m" (*pu32));
# elif RT_INLINE_ASM_USES_INTRIN
u32 = _InterlockedExchange((long *)pu32, u32);
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
mov eax, u32
xchg [rdx], eax
mov [u32], eax
# else
mov edx, [pu32]
mov eax, u32
xchg [edx], eax
mov [u32], eax
# endif
}
# endif
return u32;
}
#endif
/**
* Atomically Exchange a signed 32-bit value, ordered.
*
* @returns Current *pu32 value
* @param pi32 Pointer to the 32-bit variable to update.
* @param i32 The 32-bit value to assign to *pi32.
*/
DECLINLINE(int32_t) ASMAtomicXchgS32(volatile int32_t *pi32, int32_t i32)
{
return (int32_t)ASMAtomicXchgU32((volatile uint32_t *)pi32, (uint32_t)i32);
}
/**
* Atomically Exchange an unsigned 64-bit value, ordered.
*
* @returns Current *pu64 value
* @param pu64 Pointer to the 64-bit variable to update.
* @param u64 The 64-bit value to assign to *pu64.
*/
#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
|| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
DECLASM(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64);
#else
DECLINLINE(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64)
{
# if defined(RT_ARCH_AMD64)
# if RT_INLINE_ASM_USES_INTRIN
u64 = _InterlockedExchange64((__int64 *)pu64, u64);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("xchgq %0, %1\n\t"
: "=m" (*pu64),
"=r" (u64)
: "1" (u64),
"m" (*pu64));
# else
__asm
{
mov rdx, [pu64]
mov rax, [u64]
xchg [rdx], rax
mov [u64], rax
}
# endif
# else /* !RT_ARCH_AMD64 */
# if RT_INLINE_ASM_GNU_STYLE
# if defined(PIC) || defined(__PIC__)
uint32_t u32EBX = (uint32_t)u64;
__asm__ __volatile__(/*"xchgl %%esi, %5\n\t"*/
"xchgl %%ebx, %3\n\t"
"1:\n\t"
"lock; cmpxchg8b (%5)\n\t"
"jnz 1b\n\t"
"movl %3, %%ebx\n\t"
/*"xchgl %%esi, %5\n\t"*/
: "=A" (u64),
"=m" (*pu64)
: "0" (*pu64),
"m" ( u32EBX ),
"c" ( (uint32_t)(u64 >> 32) ),
"S" (pu64));
# else /* !PIC */
__asm__ __volatile__("1:\n\t"
"lock; cmpxchg8b %1\n\t"
"jnz 1b\n\t"
: "=A" (u64),
"=m" (*pu64)
: "0" (*pu64),
"b" ( (uint32_t)u64 ),
"c" ( (uint32_t)(u64 >> 32) ));
# endif
# else
__asm
{
mov ebx, dword ptr [u64]
mov ecx, dword ptr [u64 + 4]
mov edi, pu64
mov eax, dword ptr [edi]
mov edx, dword ptr [edi + 4]
retry:
lock cmpxchg8b [edi]
jnz retry
mov dword ptr [u64], eax
mov dword ptr [u64 + 4], edx
}
# endif
# endif /* !RT_ARCH_AMD64 */
return u64;
}
#endif
/**
* Atomically Exchange an signed 64-bit value, ordered.
*
* @returns Current *pi64 value
* @param pi64 Pointer to the 64-bit variable to update.
* @param i64 The 64-bit value to assign to *pi64.
*/
DECLINLINE(int64_t) ASMAtomicXchgS64(volatile int64_t *pi64, int64_t i64)
{
return (int64_t)ASMAtomicXchgU64((volatile uint64_t *)pi64, (uint64_t)i64);
}
/**
* Atomically Exchange a pointer value, ordered.
*
* @returns Current *ppv value
* @param ppv Pointer to the pointer variable to update.
* @param pv The pointer value to assign to *ppv.
*/
DECLINLINE(void *) ASMAtomicXchgPtr(void * volatile *ppv, const void *pv)
{
#if ARCH_BITS == 32
return (void *)ASMAtomicXchgU32((volatile uint32_t *)(void *)ppv, (uint32_t)pv);
#elif ARCH_BITS == 64
return (void *)ASMAtomicXchgU64((volatile uint64_t *)(void *)ppv, (uint64_t)pv);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Convenience macro for avoiding the annoying casting with ASMAtomicXchgPtr.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable to update.
* @param pv The pointer value to assign to *ppv.
* @param Type The type of *ppv, sans volatile.
*/
#ifdef __GNUC__
# define ASMAtomicXchgPtrT(ppv, pv, Type) \
__extension__ \
({\
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
Type const pvTypeChecked = (pv); \
Type pvTypeCheckedRet = (__typeof__(*(ppv))) ASMAtomicXchgPtr((void * volatile *)ppvTypeChecked, (void *)pvTypeChecked); \
pvTypeCheckedRet; \
})
#else
# define ASMAtomicXchgPtrT(ppv, pv, Type) \
(Type)ASMAtomicXchgPtr((void * volatile *)(ppv), (void *)(pv))
#endif
/**
* Atomically Exchange a raw-mode context pointer value, ordered.
*
* @returns Current *ppv value
* @param ppvRC Pointer to the pointer variable to update.
* @param pvRC The pointer value to assign to *ppv.
*/
DECLINLINE(RTRCPTR) ASMAtomicXchgRCPtr(RTRCPTR volatile *ppvRC, RTRCPTR pvRC)
{
return (RTRCPTR)ASMAtomicXchgU32((uint32_t volatile *)(void *)ppvRC, (uint32_t)pvRC);
}
/**
* Atomically Exchange a ring-0 pointer value, ordered.
*
* @returns Current *ppv value
* @param ppvR0 Pointer to the pointer variable to update.
* @param pvR0 The pointer value to assign to *ppv.
*/
DECLINLINE(RTR0PTR) ASMAtomicXchgR0Ptr(RTR0PTR volatile *ppvR0, RTR0PTR pvR0)
{
#if R0_ARCH_BITS == 32
return (RTR0PTR)ASMAtomicXchgU32((volatile uint32_t *)(void *)ppvR0, (uint32_t)pvR0);
#elif R0_ARCH_BITS == 64
return (RTR0PTR)ASMAtomicXchgU64((volatile uint64_t *)(void *)ppvR0, (uint64_t)pvR0);
#else
# error "R0_ARCH_BITS is bogus"
#endif
}
/**
* Atomically Exchange a ring-3 pointer value, ordered.
*
* @returns Current *ppv value
* @param ppvR3 Pointer to the pointer variable to update.
* @param pvR3 The pointer value to assign to *ppv.
*/
DECLINLINE(RTR3PTR) ASMAtomicXchgR3Ptr(RTR3PTR volatile *ppvR3, RTR3PTR pvR3)
{
#if R3_ARCH_BITS == 32
return (RTR3PTR)ASMAtomicXchgU32((volatile uint32_t *)(void *)ppvR3, (uint32_t)pvR3);
#elif R3_ARCH_BITS == 64
return (RTR3PTR)ASMAtomicXchgU64((volatile uint64_t *)(void *)ppvR3, (uint64_t)pvR3);
#else
# error "R3_ARCH_BITS is bogus"
#endif
}
/** @def ASMAtomicXchgHandle
* Atomically Exchange a typical IPRT handle value, ordered.
*
* @param ph Pointer to the value to update.
* @param hNew The new value to assigned to *pu.
* @param phRes Where to store the current *ph value.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicXchgHandle(ph, hNew, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
*(uint32_t *)(phRes) = ASMAtomicXchgU32((uint32_t volatile *)(ph), (const uint32_t)(hNew)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicXchgHandle(ph, hNew, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
*(uint64_t *)(phRes) = ASMAtomicXchgU64((uint64_t volatile *)(ph), (const uint64_t)(hNew)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/**
* Atomically Exchange a value which size might differ
* between platforms or compilers, ordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to assign to *pu.
* @todo This is busted as its missing the result argument.
*/
#define ASMAtomicXchgSize(pu, uNew) \
do { \
switch (sizeof(*(pu))) { \
case 1: ASMAtomicXchgU8((volatile uint8_t *)(void *)(pu), (uint8_t)(uNew)); break; \
case 2: ASMAtomicXchgU16((volatile uint16_t *)(void *)(pu), (uint16_t)(uNew)); break; \
case 4: ASMAtomicXchgU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: ASMAtomicXchgU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically Exchange a value which size might differ
* between platforms or compilers, ordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to assign to *pu.
* @param puRes Where to store the current *pu value.
*/
#define ASMAtomicXchgSizeCorrect(pu, uNew, puRes) \
do { \
switch (sizeof(*(pu))) { \
case 1: *(uint8_t *)(puRes) = ASMAtomicXchgU8((volatile uint8_t *)(void *)(pu), (uint8_t)(uNew)); break; \
case 2: *(uint16_t *)(puRes) = ASMAtomicXchgU16((volatile uint16_t *)(void *)(pu), (uint16_t)(uNew)); break; \
case 4: *(uint32_t *)(puRes) = ASMAtomicXchgU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: *(uint64_t *)(puRes) = ASMAtomicXchgU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically Compare and Exchange an unsigned 8-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pu8 Pointer to the value to update.
* @param u8New The new value to assigned to *pu8.
* @param u8Old The old value to *pu8 compare with.
*/
#if RT_INLINE_ASM_EXTERNAL || !RT_INLINE_ASM_GNU_STYLE
DECLASM(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, const uint8_t u8Old);
#else
DECLINLINE(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, uint8_t u8Old)
{
uint8_t u8Ret;
__asm__ __volatile__("lock; cmpxchgb %3, %0\n\t"
"setz %1\n\t"
: "=m" (*pu8),
"=qm" (u8Ret),
"=a" (u8Old)
: "q" (u8New),
"2" (u8Old),
"m" (*pu8));
return (bool)u8Ret;
}
#endif
/**
* Atomically Compare and Exchange a signed 8-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pi8 Pointer to the value to update.
* @param i8New The new value to assigned to *pi8.
* @param i8Old The old value to *pi8 compare with.
*/
DECLINLINE(bool) ASMAtomicCmpXchgS8(volatile int8_t *pi8, const int8_t i8New, const int8_t i8Old)
{
return ASMAtomicCmpXchgU8((volatile uint8_t *)pi8, (const uint8_t)i8New, (const uint8_t)i8Old);
}
/**
* Atomically Compare and Exchange a bool value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pf Pointer to the value to update.
* @param fNew The new value to assigned to *pf.
* @param fOld The old value to *pf compare with.
*/
DECLINLINE(bool) ASMAtomicCmpXchgBool(volatile bool *pf, const bool fNew, const bool fOld)
{
return ASMAtomicCmpXchgU8((volatile uint8_t *)pf, (const uint8_t)fNew, (const uint8_t)fOld);
}
/**
* Atomically Compare and Exchange an unsigned 32-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pu32 Pointer to the value to update.
* @param u32New The new value to assigned to *pu32.
* @param u32Old The old value to *pu32 compare with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old);
#else
DECLINLINE(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, uint32_t u32Old)
{
# if RT_INLINE_ASM_GNU_STYLE
uint8_t u8Ret;
__asm__ __volatile__("lock; cmpxchgl %3, %0\n\t"
"setz %1\n\t"
: "=m" (*pu32),
"=qm" (u8Ret),
"=a" (u32Old)
: "r" (u32New),
"2" (u32Old),
"m" (*pu32));
return (bool)u8Ret;
# elif RT_INLINE_ASM_USES_INTRIN
return (uint32_t)_InterlockedCompareExchange((long *)pu32, u32New, u32Old) == u32Old;
# else
uint32_t u32Ret;
__asm
{
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
# else
mov edx, [pu32]
# endif
mov eax, [u32Old]
mov ecx, [u32New]
# ifdef RT_ARCH_AMD64
lock cmpxchg [rdx], ecx
# else
lock cmpxchg [edx], ecx
# endif
setz al
movzx eax, al
mov [u32Ret], eax
}
return !!u32Ret;
# endif
}
#endif
/**
* Atomically Compare and Exchange a signed 32-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pi32 Pointer to the value to update.
* @param i32New The new value to assigned to *pi32.
* @param i32Old The old value to *pi32 compare with.
*/
DECLINLINE(bool) ASMAtomicCmpXchgS32(volatile int32_t *pi32, const int32_t i32New, const int32_t i32Old)
{
return ASMAtomicCmpXchgU32((volatile uint32_t *)pi32, (uint32_t)i32New, (uint32_t)i32Old);
}
/**
* Atomically Compare and exchange an unsigned 64-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pu64 Pointer to the 64-bit variable to update.
* @param u64New The 64-bit value to assign to *pu64.
* @param u64Old The value to compare with.
*/
#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
|| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
DECLASM(bool) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old);
#else
DECLINLINE(bool) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, uint64_t u64New, uint64_t u64Old)
{
# if RT_INLINE_ASM_USES_INTRIN
return (uint64_t)_InterlockedCompareExchange64((__int64 *)pu64, u64New, u64Old) == u64Old;
# elif defined(RT_ARCH_AMD64)
# if RT_INLINE_ASM_GNU_STYLE
uint8_t u8Ret;
__asm__ __volatile__("lock; cmpxchgq %3, %0\n\t"
"setz %1\n\t"
: "=m" (*pu64),
"=qm" (u8Ret),
"=a" (u64Old)
: "r" (u64New),
"2" (u64Old),
"m" (*pu64));
return (bool)u8Ret;
# else
bool fRet;
__asm
{
mov rdx, [pu32]
mov rax, [u64Old]
mov rcx, [u64New]
lock cmpxchg [rdx], rcx
setz al
mov [fRet], al
}
return fRet;
# endif
# else /* !RT_ARCH_AMD64 */
uint32_t u32Ret;
# if RT_INLINE_ASM_GNU_STYLE
# if defined(PIC) || defined(__PIC__)
uint32_t u32EBX = (uint32_t)u64New;
uint32_t u32Spill;
__asm__ __volatile__("xchgl %%ebx, %4\n\t"
"lock; cmpxchg8b (%6)\n\t"
"setz %%al\n\t"
"movl %4, %%ebx\n\t"
"movzbl %%al, %%eax\n\t"
: "=a" (u32Ret),
"=d" (u32Spill),
# if (__GNUC__ * 100 + __GNUC_MINOR__) >= 403
"+m" (*pu64)
# else
"=m" (*pu64)
# endif
: "A" (u64Old),
"m" ( u32EBX ),
"c" ( (uint32_t)(u64New >> 32) ),
"S" (pu64));
# else /* !PIC */
uint32_t u32Spill;
__asm__ __volatile__("lock; cmpxchg8b %2\n\t"
"setz %%al\n\t"
"movzbl %%al, %%eax\n\t"
: "=a" (u32Ret),
"=d" (u32Spill),
"+m" (*pu64)
: "A" (u64Old),
"b" ( (uint32_t)u64New ),
"c" ( (uint32_t)(u64New >> 32) ));
# endif
return (bool)u32Ret;
# else
__asm
{
mov ebx, dword ptr [u64New]
mov ecx, dword ptr [u64New + 4]
mov edi, [pu64]
mov eax, dword ptr [u64Old]
mov edx, dword ptr [u64Old + 4]
lock cmpxchg8b [edi]
setz al
movzx eax, al
mov dword ptr [u32Ret], eax
}
return !!u32Ret;
# endif
# endif /* !RT_ARCH_AMD64 */
}
#endif
/**
* Atomically Compare and exchange a signed 64-bit value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pi64 Pointer to the 64-bit variable to update.
* @param i64 The 64-bit value to assign to *pu64.
* @param i64Old The value to compare with.
*/
DECLINLINE(bool) ASMAtomicCmpXchgS64(volatile int64_t *pi64, const int64_t i64, const int64_t i64Old)
{
return ASMAtomicCmpXchgU64((volatile uint64_t *)pi64, (uint64_t)i64, (uint64_t)i64Old);
}
/**
* Atomically Compare and Exchange a pointer value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param ppv Pointer to the value to update.
* @param pvNew The new value to assigned to *ppv.
* @param pvOld The old value to *ppv compare with.
*/
DECLINLINE(bool) ASMAtomicCmpXchgPtrVoid(void * volatile *ppv, const void *pvNew, const void *pvOld)
{
#if ARCH_BITS == 32
return ASMAtomicCmpXchgU32((volatile uint32_t *)(void *)ppv, (uint32_t)pvNew, (uint32_t)pvOld);
#elif ARCH_BITS == 64
return ASMAtomicCmpXchgU64((volatile uint64_t *)(void *)ppv, (uint64_t)pvNew, (uint64_t)pvOld);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Atomically Compare and Exchange a pointer value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param ppv Pointer to the value to update.
* @param pvNew The new value to assigned to *ppv.
* @param pvOld The old value to *ppv compare with.
*
* @remarks This is relatively type safe on GCC platforms.
*/
#ifdef __GNUC__
# define ASMAtomicCmpXchgPtr(ppv, pvNew, pvOld) \
__extension__ \
({\
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
__typeof__(*(ppv)) const pvNewTypeChecked = (pvNew); \
__typeof__(*(ppv)) const pvOldTypeChecked = (pvOld); \
bool fMacroRet = ASMAtomicCmpXchgPtrVoid((void * volatile *)ppvTypeChecked, \
(void *)pvNewTypeChecked, (void *)pvOldTypeChecked); \
fMacroRet; \
})
#else
# define ASMAtomicCmpXchgPtr(ppv, pvNew, pvOld) \
ASMAtomicCmpXchgPtrVoid((void * volatile *)(ppv), (void *)(pvNew), (void *)(pvOld))
#endif
/** @def ASMAtomicCmpXchgHandle
* Atomically Compare and Exchange a typical IPRT handle value, ordered.
*
* @param ph Pointer to the value to update.
* @param hNew The new value to assigned to *pu.
* @param hOld The old value to *pu compare with.
* @param fRc Where to store the result.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicCmpXchgHandle(ph, hNew, hOld, fRc) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
(fRc) = ASMAtomicCmpXchgU32((uint32_t volatile *)(ph), (const uint32_t)(hNew), (const uint32_t)(hOld)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicCmpXchgHandle(ph, hNew, hOld, fRc) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
(fRc) = ASMAtomicCmpXchgU64((uint64_t volatile *)(ph), (const uint64_t)(hNew), (const uint64_t)(hOld)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/** @def ASMAtomicCmpXchgSize
* Atomically Compare and Exchange a value which size might differ
* between platforms or compilers, ordered.
*
* @param pu Pointer to the value to update.
* @param uNew The new value to assigned to *pu.
* @param uOld The old value to *pu compare with.
* @param fRc Where to store the result.
*/
#define ASMAtomicCmpXchgSize(pu, uNew, uOld, fRc) \
do { \
switch (sizeof(*(pu))) { \
case 4: (fRc) = ASMAtomicCmpXchgU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew), (uint32_t)(uOld)); \
break; \
case 8: (fRc) = ASMAtomicCmpXchgU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew), (uint64_t)(uOld)); \
break; \
default: AssertMsgFailed(("ASMAtomicCmpXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
(fRc) = false; \
break; \
} \
} while (0)
/**
* Atomically Compare and Exchange an unsigned 32-bit value, additionally
* passes back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pu32 Pointer to the value to update.
* @param u32New The new value to assigned to *pu32.
* @param u32Old The old value to *pu32 compare with.
* @param pu32Old Pointer store the old value at.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMAtomicCmpXchgExU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t *pu32Old);
#else
DECLINLINE(bool) ASMAtomicCmpXchgExU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t *pu32Old)
{
# if RT_INLINE_ASM_GNU_STYLE
uint8_t u8Ret;
__asm__ __volatile__("lock; cmpxchgl %3, %0\n\t"
"setz %1\n\t"
: "=m" (*pu32),
"=qm" (u8Ret),
"=a" (*pu32Old)
: "r" (u32New),
"a" (u32Old),
"m" (*pu32));
return (bool)u8Ret;
# elif RT_INLINE_ASM_USES_INTRIN
return (*pu32Old =_InterlockedCompareExchange((long *)pu32, u32New, u32Old)) == u32Old;
# else
uint32_t u32Ret;
__asm
{
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
# else
mov edx, [pu32]
# endif
mov eax, [u32Old]
mov ecx, [u32New]
# ifdef RT_ARCH_AMD64
lock cmpxchg [rdx], ecx
mov rdx, [pu32Old]
mov [rdx], eax
# else
lock cmpxchg [edx], ecx
mov edx, [pu32Old]
mov [edx], eax
# endif
setz al
movzx eax, al
mov [u32Ret], eax
}
return !!u32Ret;
# endif
}
#endif
/**
* Atomically Compare and Exchange a signed 32-bit value, additionally
* passes back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pi32 Pointer to the value to update.
* @param i32New The new value to assigned to *pi32.
* @param i32Old The old value to *pi32 compare with.
* @param pi32Old Pointer store the old value at.
*/
DECLINLINE(bool) ASMAtomicCmpXchgExS32(volatile int32_t *pi32, const int32_t i32New, const int32_t i32Old, int32_t *pi32Old)
{
return ASMAtomicCmpXchgExU32((volatile uint32_t *)pi32, (uint32_t)i32New, (uint32_t)i32Old, (uint32_t *)pi32Old);
}
/**
* Atomically Compare and exchange an unsigned 64-bit value, additionally
* passing back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pu64 Pointer to the 64-bit variable to update.
* @param u64New The 64-bit value to assign to *pu64.
* @param u64Old The value to compare with.
* @param pu64Old Pointer store the old value at.
*/
#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
|| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
DECLASM(bool) ASMAtomicCmpXchgExU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t *pu64Old);
#else
DECLINLINE(bool) ASMAtomicCmpXchgExU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t *pu64Old)
{
# if RT_INLINE_ASM_USES_INTRIN
return (*pu64Old =_InterlockedCompareExchange64((__int64 *)pu64, u64New, u64Old)) == u64Old;
# elif defined(RT_ARCH_AMD64)
# if RT_INLINE_ASM_GNU_STYLE
uint8_t u8Ret;
__asm__ __volatile__("lock; cmpxchgq %3, %0\n\t"
"setz %1\n\t"
: "=m" (*pu64),
"=qm" (u8Ret),
"=a" (*pu64Old)
: "r" (u64New),
"a" (u64Old),
"m" (*pu64));
return (bool)u8Ret;
# else
bool fRet;
__asm
{
mov rdx, [pu32]
mov rax, [u64Old]
mov rcx, [u64New]
lock cmpxchg [rdx], rcx
mov rdx, [pu64Old]
mov [rdx], rax
setz al
mov [fRet], al
}
return fRet;
# endif
# else /* !RT_ARCH_AMD64 */
# if RT_INLINE_ASM_GNU_STYLE
uint64_t u64Ret;
# if defined(PIC) || defined(__PIC__)
/* NB: this code uses a memory clobber description, because the clean
* solution with an output value for *pu64 makes gcc run out of registers.
* This will cause suboptimal code, and anyone with a better solution is
* welcome to improve this. */
__asm__ __volatile__("xchgl %%ebx, %1\n\t"
"lock; cmpxchg8b %3\n\t"
"xchgl %%ebx, %1\n\t"
: "=A" (u64Ret)
: "DS" ((uint32_t)u64New),
"c" ((uint32_t)(u64New >> 32)),
"m" (*pu64),
"0" (u64Old)
: "memory" );
# else /* !PIC */
__asm__ __volatile__("lock; cmpxchg8b %4\n\t"
: "=A" (u64Ret),
"=m" (*pu64)
: "b" ((uint32_t)u64New),
"c" ((uint32_t)(u64New >> 32)),
"m" (*pu64),
"0" (u64Old));
# endif
*pu64Old = u64Ret;
return u64Ret == u64Old;
# else
uint32_t u32Ret;
__asm
{
mov ebx, dword ptr [u64New]
mov ecx, dword ptr [u64New + 4]
mov edi, [pu64]
mov eax, dword ptr [u64Old]
mov edx, dword ptr [u64Old + 4]
lock cmpxchg8b [edi]
mov ebx, [pu64Old]
mov [ebx], eax
setz al
movzx eax, al
add ebx, 4
mov [ebx], edx
mov dword ptr [u32Ret], eax
}
return !!u32Ret;
# endif
# endif /* !RT_ARCH_AMD64 */
}
#endif
/**
* Atomically Compare and exchange a signed 64-bit value, additionally
* passing back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param pi64 Pointer to the 64-bit variable to update.
* @param i64 The 64-bit value to assign to *pu64.
* @param i64Old The value to compare with.
* @param pi64Old Pointer store the old value at.
*/
DECLINLINE(bool) ASMAtomicCmpXchgExS64(volatile int64_t *pi64, const int64_t i64, const int64_t i64Old, int64_t *pi64Old)
{
return ASMAtomicCmpXchgExU64((volatile uint64_t *)pi64, (uint64_t)i64, (uint64_t)i64Old, (uint64_t *)pi64Old);
}
/** @def ASMAtomicCmpXchgExHandle
* Atomically Compare and Exchange a typical IPRT handle value, ordered.
*
* @param ph Pointer to the value to update.
* @param hNew The new value to assigned to *pu.
* @param hOld The old value to *pu compare with.
* @param fRc Where to store the result.
* @param phOldVal Pointer to where to store the old value.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicCmpXchgExHandle(ph, hNew, hOld, fRc, phOldVal) \
do { \
AssertCompile(sizeof(*ph) == sizeof(uint32_t)); \
AssertCompile(sizeof(*phOldVal) == sizeof(uint32_t)); \
(fRc) = ASMAtomicCmpXchgExU32((volatile uint32_t *)(pu), (uint32_t)(uNew), (uint32_t)(uOld), (uint32_t *)(puOldVal)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicCmpXchgExHandle(ph, hNew, hOld, fRc, phOldVal) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
AssertCompile(sizeof(*(phOldVal)) == sizeof(uint64_t)); \
(fRc) = ASMAtomicCmpXchgExU64((volatile uint64_t *)(pu), (uint64_t)(uNew), (uint64_t)(uOld), (uint64_t *)(puOldVal)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/** @def ASMAtomicCmpXchgExSize
* Atomically Compare and Exchange a value which size might differ
* between platforms or compilers. Additionally passes back old value.
*
* @param pu Pointer to the value to update.
* @param uNew The new value to assigned to *pu.
* @param uOld The old value to *pu compare with.
* @param fRc Where to store the result.
* @param puOldVal Pointer to where to store the old value.
*/
#define ASMAtomicCmpXchgExSize(pu, uNew, uOld, fRc, puOldVal) \
do { \
switch (sizeof(*(pu))) { \
case 4: (fRc) = ASMAtomicCmpXchgExU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew), (uint32_t)(uOld), (uint32_t *)(uOldVal)); \
break; \
case 8: (fRc) = ASMAtomicCmpXchgExU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew), (uint64_t)(uOld), (uint64_t *)(uOldVal)); \
break; \
default: AssertMsgFailed(("ASMAtomicCmpXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
(fRc) = false; \
(uOldVal) = 0; \
break; \
} \
} while (0)
/**
* Atomically Compare and Exchange a pointer value, additionally
* passing back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param ppv Pointer to the value to update.
* @param pvNew The new value to assigned to *ppv.
* @param pvOld The old value to *ppv compare with.
* @param ppvOld Pointer store the old value at.
*/
DECLINLINE(bool) ASMAtomicCmpXchgExPtrVoid(void * volatile *ppv, const void *pvNew, const void *pvOld, void **ppvOld)
{
#if ARCH_BITS == 32
return ASMAtomicCmpXchgExU32((volatile uint32_t *)(void *)ppv, (uint32_t)pvNew, (uint32_t)pvOld, (uint32_t *)ppvOld);
#elif ARCH_BITS == 64
return ASMAtomicCmpXchgExU64((volatile uint64_t *)(void *)ppv, (uint64_t)pvNew, (uint64_t)pvOld, (uint64_t *)ppvOld);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Atomically Compare and Exchange a pointer value, additionally
* passing back old value, ordered.
*
* @returns true if xchg was done.
* @returns false if xchg wasn't done.
*
* @param ppv Pointer to the value to update.
* @param pvNew The new value to assigned to *ppv.
* @param pvOld The old value to *ppv compare with.
* @param ppvOld Pointer store the old value at.
*
* @remarks This is relatively type safe on GCC platforms.
*/
#ifdef __GNUC__
# define ASMAtomicCmpXchgExPtr(ppv, pvNew, pvOld, ppvOld) \
__extension__ \
({\
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
__typeof__(*(ppv)) const pvNewTypeChecked = (pvNew); \
__typeof__(*(ppv)) const pvOldTypeChecked = (pvOld); \
__typeof__(*(ppv)) * const ppvOldTypeChecked = (ppvOld); \
bool fMacroRet = ASMAtomicCmpXchgExPtrVoid((void * volatile *)ppvTypeChecked, \
(void *)pvNewTypeChecked, (void *)pvOldTypeChecked, \
(void **)ppvOldTypeChecked); \
fMacroRet; \
})
#else
# define ASMAtomicCmpXchgExPtr(ppv, pvNew, pvOld, ppvOld) \
ASMAtomicCmpXchgExPtrVoid((void * volatile *)(ppv), (void *)(pvNew), (void *)(pvOld), (void **)(ppvOld))
#endif
/**
* Serialize Instruction.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMSerializeInstruction(void);
#else
DECLINLINE(void) ASMSerializeInstruction(void)
{
# if RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG xAX = 0;
# ifdef RT_ARCH_AMD64
__asm__ ("cpuid"
: "=a" (xAX)
: "0" (xAX)
: "rbx", "rcx", "rdx");
# elif (defined(PIC) || defined(__PIC__)) && defined(__i386__)
__asm__ ("push %%ebx\n\t"
"cpuid\n\t"
"pop %%ebx\n\t"
: "=a" (xAX)
: "0" (xAX)
: "ecx", "edx");
# else
__asm__ ("cpuid"
: "=a" (xAX)
: "0" (xAX)
: "ebx", "ecx", "edx");
# endif
# elif RT_INLINE_ASM_USES_INTRIN
int aInfo[4];
__cpuid(aInfo, 0);
# else
__asm
{
push ebx
xor eax, eax
cpuid
pop ebx
}
# endif
}
#endif
/**
* Memory fence, waits for any pending writes and reads to complete.
*/
DECLINLINE(void) ASMMemoryFence(void)
{
/** @todo use mfence? check if all cpus we care for support it. */
uint32_t volatile u32;
ASMAtomicXchgU32(&u32, 0);
}
/**
* Write fence, waits for any pending writes to complete.
*/
DECLINLINE(void) ASMWriteFence(void)
{
/** @todo use sfence? check if all cpus we care for support it. */
ASMMemoryFence();
}
/**
* Read fence, waits for any pending reads to complete.
*/
DECLINLINE(void) ASMReadFence(void)
{
/** @todo use lfence? check if all cpus we care for support it. */
ASMMemoryFence();
}
/**
* Atomically reads an unsigned 8-bit value, ordered.
*
* @returns Current *pu8 value
* @param pu8 Pointer to the 8-bit variable to read.
*/
DECLINLINE(uint8_t) ASMAtomicReadU8(volatile uint8_t *pu8)
{
ASMMemoryFence();
return *pu8; /* byte reads are atomic on x86 */
}
/**
* Atomically reads an unsigned 8-bit value, unordered.
*
* @returns Current *pu8 value
* @param pu8 Pointer to the 8-bit variable to read.
*/
DECLINLINE(uint8_t) ASMAtomicUoReadU8(volatile uint8_t *pu8)
{
return *pu8; /* byte reads are atomic on x86 */
}
/**
* Atomically reads a signed 8-bit value, ordered.
*
* @returns Current *pi8 value
* @param pi8 Pointer to the 8-bit variable to read.
*/
DECLINLINE(int8_t) ASMAtomicReadS8(volatile int8_t *pi8)
{
ASMMemoryFence();
return *pi8; /* byte reads are atomic on x86 */
}
/**
* Atomically reads a signed 8-bit value, unordered.
*
* @returns Current *pi8 value
* @param pi8 Pointer to the 8-bit variable to read.
*/
DECLINLINE(int8_t) ASMAtomicUoReadS8(volatile int8_t *pi8)
{
return *pi8; /* byte reads are atomic on x86 */
}
/**
* Atomically reads an unsigned 16-bit value, ordered.
*
* @returns Current *pu16 value
* @param pu16 Pointer to the 16-bit variable to read.
*/
DECLINLINE(uint16_t) ASMAtomicReadU16(volatile uint16_t *pu16)
{
ASMMemoryFence();
Assert(!((uintptr_t)pu16 & 1));
return *pu16;
}
/**
* Atomically reads an unsigned 16-bit value, unordered.
*
* @returns Current *pu16 value
* @param pu16 Pointer to the 16-bit variable to read.
*/
DECLINLINE(uint16_t) ASMAtomicUoReadU16(volatile uint16_t *pu16)
{
Assert(!((uintptr_t)pu16 & 1));
return *pu16;
}
/**
* Atomically reads a signed 16-bit value, ordered.
*
* @returns Current *pi16 value
* @param pi16 Pointer to the 16-bit variable to read.
*/
DECLINLINE(int16_t) ASMAtomicReadS16(volatile int16_t *pi16)
{
ASMMemoryFence();
Assert(!((uintptr_t)pi16 & 1));
return *pi16;
}
/**
* Atomically reads a signed 16-bit value, unordered.
*
* @returns Current *pi16 value
* @param pi16 Pointer to the 16-bit variable to read.
*/
DECLINLINE(int16_t) ASMAtomicUoReadS16(volatile int16_t *pi16)
{
Assert(!((uintptr_t)pi16 & 1));
return *pi16;
}
/**
* Atomically reads an unsigned 32-bit value, ordered.
*
* @returns Current *pu32 value
* @param pu32 Pointer to the 32-bit variable to read.
*/
DECLINLINE(uint32_t) ASMAtomicReadU32(volatile uint32_t *pu32)
{
ASMMemoryFence();
Assert(!((uintptr_t)pu32 & 3));
return *pu32;
}
/**
* Atomically reads an unsigned 32-bit value, unordered.
*
* @returns Current *pu32 value
* @param pu32 Pointer to the 32-bit variable to read.
*/
DECLINLINE(uint32_t) ASMAtomicUoReadU32(volatile uint32_t *pu32)
{
Assert(!((uintptr_t)pu32 & 3));
return *pu32;
}
/**
* Atomically reads a signed 32-bit value, ordered.
*
* @returns Current *pi32 value
* @param pi32 Pointer to the 32-bit variable to read.
*/
DECLINLINE(int32_t) ASMAtomicReadS32(volatile int32_t *pi32)
{
ASMMemoryFence();
Assert(!((uintptr_t)pi32 & 3));
return *pi32;
}
/**
* Atomically reads a signed 32-bit value, unordered.
*
* @returns Current *pi32 value
* @param pi32 Pointer to the 32-bit variable to read.
*/
DECLINLINE(int32_t) ASMAtomicUoReadS32(volatile int32_t *pi32)
{
Assert(!((uintptr_t)pi32 & 3));
return *pi32;
}
/**
* Atomically reads an unsigned 64-bit value, ordered.
*
* @returns Current *pu64 value
* @param pu64 Pointer to the 64-bit variable to read.
* The memory pointed to must be writable.
* @remark This will fault if the memory is read-only!
*/
#if (RT_INLINE_ASM_EXTERNAL && !defined(RT_ARCH_AMD64)) \
|| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
DECLASM(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64);
#else
DECLINLINE(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64)
{
uint64_t u64;
# ifdef RT_ARCH_AMD64
Assert(!((uintptr_t)pu64 & 7));
/*# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__( "mfence\n\t"
"movq %1, %0\n\t"
: "=r" (u64)
: "m" (*pu64));
# else
__asm
{
mfence
mov rdx, [pu64]
mov rax, [rdx]
mov [u64], rax
}
# endif*/
ASMMemoryFence();
u64 = *pu64;
# else /* !RT_ARCH_AMD64 */
# if RT_INLINE_ASM_GNU_STYLE
# if defined(PIC) || defined(__PIC__)
uint32_t u32EBX = 0;
Assert(!((uintptr_t)pu64 & 7));
__asm__ __volatile__("xchgl %%ebx, %3\n\t"
"lock; cmpxchg8b (%5)\n\t"
"movl %3, %%ebx\n\t"
: "=A" (u64),
# if (__GNUC__ * 100 + __GNUC_MINOR__) >= 403
"+m" (*pu64)
# else
"=m" (*pu64)
# endif
: "0" (0ULL),
"m" (u32EBX),
"c" (0),
"S" (pu64));
# else /* !PIC */
__asm__ __volatile__("lock; cmpxchg8b %1\n\t"
: "=A" (u64),
"+m" (*pu64)
: "0" (0ULL),
"b" (0),
"c" (0));
# endif
# else
Assert(!((uintptr_t)pu64 & 7));
__asm
{
xor eax, eax
xor edx, edx
mov edi, pu64
xor ecx, ecx
xor ebx, ebx
lock cmpxchg8b [edi]
mov dword ptr [u64], eax
mov dword ptr [u64 + 4], edx
}
# endif
# endif /* !RT_ARCH_AMD64 */
return u64;
}
#endif
/**
* Atomically reads an unsigned 64-bit value, unordered.
*
* @returns Current *pu64 value
* @param pu64 Pointer to the 64-bit variable to read.
* The memory pointed to must be writable.
* @remark This will fault if the memory is read-only!
*/
#if !defined(RT_ARCH_AMD64) \
&& ( (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
|| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC)
DECLASM(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64);
#else
DECLINLINE(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64)
{
uint64_t u64;
# ifdef RT_ARCH_AMD64
Assert(!((uintptr_t)pu64 & 7));
/*# if RT_INLINE_ASM_GNU_STYLE
Assert(!((uintptr_t)pu64 & 7));
__asm__ __volatile__("movq %1, %0\n\t"
: "=r" (u64)
: "m" (*pu64));
# else
__asm
{
mov rdx, [pu64]
mov rax, [rdx]
mov [u64], rax
}
# endif */
u64 = *pu64;
# else /* !RT_ARCH_AMD64 */
# if RT_INLINE_ASM_GNU_STYLE
# if defined(PIC) || defined(__PIC__)
uint32_t u32EBX = 0;
uint32_t u32Spill;
Assert(!((uintptr_t)pu64 & 7));
__asm__ __volatile__("xor %%eax,%%eax\n\t"
"xor %%ecx,%%ecx\n\t"
"xor %%edx,%%edx\n\t"
"xchgl %%ebx, %3\n\t"
"lock; cmpxchg8b (%4)\n\t"
"movl %3, %%ebx\n\t"
: "=A" (u64),
# if (__GNUC__ * 100 + __GNUC_MINOR__) >= 403
"+m" (*pu64),
# else
"=m" (*pu64),
# endif
"=c" (u32Spill)
: "m" (u32EBX),
"S" (pu64));
# else /* !PIC */
__asm__ __volatile__("lock; cmpxchg8b %1\n\t"
: "=A" (u64),
"+m" (*pu64)
: "0" (0ULL),
"b" (0),
"c" (0));
# endif
# else
Assert(!((uintptr_t)pu64 & 7));
__asm
{
xor eax, eax
xor edx, edx
mov edi, pu64
xor ecx, ecx
xor ebx, ebx
lock cmpxchg8b [edi]
mov dword ptr [u64], eax
mov dword ptr [u64 + 4], edx
}
# endif
# endif /* !RT_ARCH_AMD64 */
return u64;
}
#endif
/**
* Atomically reads a signed 64-bit value, ordered.
*
* @returns Current *pi64 value
* @param pi64 Pointer to the 64-bit variable to read.
* The memory pointed to must be writable.
* @remark This will fault if the memory is read-only!
*/
DECLINLINE(int64_t) ASMAtomicReadS64(volatile int64_t *pi64)
{
return (int64_t)ASMAtomicReadU64((volatile uint64_t *)pi64);
}
/**
* Atomically reads a signed 64-bit value, unordered.
*
* @returns Current *pi64 value
* @param pi64 Pointer to the 64-bit variable to read.
* The memory pointed to must be writable.
* @remark This will fault if the memory is read-only!
*/
DECLINLINE(int64_t) ASMAtomicUoReadS64(volatile int64_t *pi64)
{
return (int64_t)ASMAtomicUoReadU64((volatile uint64_t *)pi64);
}
/**
* Atomically reads a size_t value, ordered.
*
* @returns Current *pcb value
* @param pcb Pointer to the size_t variable to read.
*/
DECLINLINE(size_t) ASMAtomicReadZ(size_t volatile *pcb)
{
#if ARCH_BITS == 64
return ASMAtomicReadU64((uint64_t volatile *)pcb);
#elif ARCH_BITS == 32
return ASMAtomicReadU32((uint32_t volatile *)pcb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically reads a size_t value, unordered.
*
* @returns Current *pcb value
* @param pcb Pointer to the size_t variable to read.
*/
DECLINLINE(size_t) ASMAtomicUoReadZ(size_t volatile *pcb)
{
#if ARCH_BITS == 64
return ASMAtomicUoReadU64((uint64_t volatile *)pcb);
#elif ARCH_BITS == 32
return ASMAtomicUoReadU32((uint32_t volatile *)pcb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically reads a pointer value, ordered.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable to read.
*
* @remarks Please use ASMAtomicReadPtrT, it provides better type safety and
* requires less typing (no casts).
*/
DECLINLINE(void *) ASMAtomicReadPtr(void * volatile *ppv)
{
#if ARCH_BITS == 32
return (void *)ASMAtomicReadU32((volatile uint32_t *)(void *)ppv);
#elif ARCH_BITS == 64
return (void *)ASMAtomicReadU64((volatile uint64_t *)(void *)ppv);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Convenience macro for avoiding the annoying casting with ASMAtomicReadPtr.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable to read.
* @param Type The type of *ppv, sans volatile.
*/
#ifdef __GNUC__
# define ASMAtomicReadPtrT(ppv, Type) \
__extension__ \
({\
__typeof__(*(ppv)) volatile *ppvTypeChecked = (ppv); \
Type pvTypeChecked = (__typeof__(*(ppv))) ASMAtomicReadPtr((void * volatile *)ppvTypeChecked); \
pvTypeChecked; \
})
#else
# define ASMAtomicReadPtrT(ppv, Type) \
(Type)ASMAtomicReadPtr((void * volatile *)(ppv))
#endif
/**
* Atomically reads a pointer value, unordered.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable to read.
*
* @remarks Please use ASMAtomicUoReadPtrT, it provides better type safety and
* requires less typing (no casts).
*/
DECLINLINE(void *) ASMAtomicUoReadPtr(void * volatile *ppv)
{
#if ARCH_BITS == 32
return (void *)ASMAtomicUoReadU32((volatile uint32_t *)(void *)ppv);
#elif ARCH_BITS == 64
return (void *)ASMAtomicUoReadU64((volatile uint64_t *)(void *)ppv);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Convenience macro for avoiding the annoying casting with ASMAtomicUoReadPtr.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable to read.
* @param Type The type of *ppv, sans volatile.
*/
#ifdef __GNUC__
# define ASMAtomicUoReadPtrT(ppv, Type) \
__extension__ \
({\
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
Type pvTypeChecked = (__typeof__(*(ppv))) ASMAtomicUoReadPtr((void * volatile *)ppvTypeChecked); \
pvTypeChecked; \
})
#else
# define ASMAtomicUoReadPtrT(ppv, Type) \
(Type)ASMAtomicUoReadPtr((void * volatile *)(ppv))
#endif
/**
* Atomically reads a boolean value, ordered.
*
* @returns Current *pf value
* @param pf Pointer to the boolean variable to read.
*/
DECLINLINE(bool) ASMAtomicReadBool(volatile bool *pf)
{
ASMMemoryFence();
return *pf; /* byte reads are atomic on x86 */
}
/**
* Atomically reads a boolean value, unordered.
*
* @returns Current *pf value
* @param pf Pointer to the boolean variable to read.
*/
DECLINLINE(bool) ASMAtomicUoReadBool(volatile bool *pf)
{
return *pf; /* byte reads are atomic on x86 */
}
/**
* Atomically read a typical IPRT handle value, ordered.
*
* @param ph Pointer to the handle variable to read.
* @param phRes Where to store the result.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicReadHandle(ph, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
*(uint32_t *)(phRes) = ASMAtomicReadU32((uint32_t volatile *)(ph)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicReadHandle(ph, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
*(uint64_t *)(phRes) = ASMAtomicReadU64((uint64_t volatile *)(ph)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/**
* Atomically read a typical IPRT handle value, unordered.
*
* @param ph Pointer to the handle variable to read.
* @param phRes Where to store the result.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicUoReadHandle(ph, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
*(uint32_t *)(phRes) = ASMAtomicUoReadU32((uint32_t volatile *)(ph)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicUoReadHandle(ph, phRes) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
*(uint64_t *)(phRes) = ASMAtomicUoReadU64((uint64_t volatile *)(ph)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/**
* Atomically read a value which size might differ
* between platforms or compilers, ordered.
*
* @param pu Pointer to the variable to read.
* @param puRes Where to store the result.
*/
#define ASMAtomicReadSize(pu, puRes) \
do { \
switch (sizeof(*(pu))) { \
case 1: *(uint8_t *)(puRes) = ASMAtomicReadU8( (volatile uint8_t *)(void *)(pu)); break; \
case 2: *(uint16_t *)(puRes) = ASMAtomicReadU16((volatile uint16_t *)(void *)(pu)); break; \
case 4: *(uint32_t *)(puRes) = ASMAtomicReadU32((volatile uint32_t *)(void *)(pu)); break; \
case 8: *(uint64_t *)(puRes) = ASMAtomicReadU64((volatile uint64_t *)(void *)(pu)); break; \
default: AssertMsgFailed(("ASMAtomicReadSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically read a value which size might differ
* between platforms or compilers, unordered.
*
* @param pu Pointer to the variable to read.
* @param puRes Where to store the result.
*/
#define ASMAtomicUoReadSize(pu, puRes) \
do { \
switch (sizeof(*(pu))) { \
case 1: *(uint8_t *)(puRes) = ASMAtomicUoReadU8( (volatile uint8_t *)(void *)(pu)); break; \
case 2: *(uint16_t *)(puRes) = ASMAtomicUoReadU16((volatile uint16_t *)(void *)(pu)); break; \
case 4: *(uint32_t *)(puRes) = ASMAtomicUoReadU32((volatile uint32_t *)(void *)(pu)); break; \
case 8: *(uint64_t *)(puRes) = ASMAtomicUoReadU64((volatile uint64_t *)(void *)(pu)); break; \
default: AssertMsgFailed(("ASMAtomicReadSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically writes an unsigned 8-bit value, ordered.
*
* @param pu8 Pointer to the 8-bit variable.
* @param u8 The 8-bit value to assign to *pu8.
*/
DECLINLINE(void) ASMAtomicWriteU8(volatile uint8_t *pu8, uint8_t u8)
{
ASMAtomicXchgU8(pu8, u8);
}
/**
* Atomically writes an unsigned 8-bit value, unordered.
*
* @param pu8 Pointer to the 8-bit variable.
* @param u8 The 8-bit value to assign to *pu8.
*/
DECLINLINE(void) ASMAtomicUoWriteU8(volatile uint8_t *pu8, uint8_t u8)
{
*pu8 = u8; /* byte writes are atomic on x86 */
}
/**
* Atomically writes a signed 8-bit value, ordered.
*
* @param pi8 Pointer to the 8-bit variable to read.
* @param i8 The 8-bit value to assign to *pi8.
*/
DECLINLINE(void) ASMAtomicWriteS8(volatile int8_t *pi8, int8_t i8)
{
ASMAtomicXchgS8(pi8, i8);
}
/**
* Atomically writes a signed 8-bit value, unordered.
*
* @param pi8 Pointer to the 8-bit variable to write.
* @param i8 The 8-bit value to assign to *pi8.
*/
DECLINLINE(void) ASMAtomicUoWriteS8(volatile int8_t *pi8, int8_t i8)
{
*pi8 = i8; /* byte writes are atomic on x86 */
}
/**
* Atomically writes an unsigned 16-bit value, ordered.
*
* @param pu16 Pointer to the 16-bit variable to write.
* @param u16 The 16-bit value to assign to *pu16.
*/
DECLINLINE(void) ASMAtomicWriteU16(volatile uint16_t *pu16, uint16_t u16)
{
ASMAtomicXchgU16(pu16, u16);
}
/**
* Atomically writes an unsigned 16-bit value, unordered.
*
* @param pu16 Pointer to the 16-bit variable to write.
* @param u16 The 16-bit value to assign to *pu16.
*/
DECLINLINE(void) ASMAtomicUoWriteU16(volatile uint16_t *pu16, uint16_t u16)
{
Assert(!((uintptr_t)pu16 & 1));
*pu16 = u16;
}
/**
* Atomically writes a signed 16-bit value, ordered.
*
* @param pi16 Pointer to the 16-bit variable to write.
* @param i16 The 16-bit value to assign to *pi16.
*/
DECLINLINE(void) ASMAtomicWriteS16(volatile int16_t *pi16, int16_t i16)
{
ASMAtomicXchgS16(pi16, i16);
}
/**
* Atomically writes a signed 16-bit value, unordered.
*
* @param pi16 Pointer to the 16-bit variable to write.
* @param i16 The 16-bit value to assign to *pi16.
*/
DECLINLINE(void) ASMAtomicUoWriteS16(volatile int16_t *pi16, int16_t i16)
{
Assert(!((uintptr_t)pi16 & 1));
*pi16 = i16;
}
/**
* Atomically writes an unsigned 32-bit value, ordered.
*
* @param pu32 Pointer to the 32-bit variable to write.
* @param u32 The 32-bit value to assign to *pu32.
*/
DECLINLINE(void) ASMAtomicWriteU32(volatile uint32_t *pu32, uint32_t u32)
{
ASMAtomicXchgU32(pu32, u32);
}
/**
* Atomically writes an unsigned 32-bit value, unordered.
*
* @param pu32 Pointer to the 32-bit variable to write.
* @param u32 The 32-bit value to assign to *pu32.
*/
DECLINLINE(void) ASMAtomicUoWriteU32(volatile uint32_t *pu32, uint32_t u32)
{
Assert(!((uintptr_t)pu32 & 3));
*pu32 = u32;
}
/**
* Atomically writes a signed 32-bit value, ordered.
*
* @param pi32 Pointer to the 32-bit variable to write.
* @param i32 The 32-bit value to assign to *pi32.
*/
DECLINLINE(void) ASMAtomicWriteS32(volatile int32_t *pi32, int32_t i32)
{
ASMAtomicXchgS32(pi32, i32);
}
/**
* Atomically writes a signed 32-bit value, unordered.
*
* @param pi32 Pointer to the 32-bit variable to write.
* @param i32 The 32-bit value to assign to *pi32.
*/
DECLINLINE(void) ASMAtomicUoWriteS32(volatile int32_t *pi32, int32_t i32)
{
Assert(!((uintptr_t)pi32 & 3));
*pi32 = i32;
}
/**
* Atomically writes an unsigned 64-bit value, ordered.
*
* @param pu64 Pointer to the 64-bit variable to write.
* @param u64 The 64-bit value to assign to *pu64.
*/
DECLINLINE(void) ASMAtomicWriteU64(volatile uint64_t *pu64, uint64_t u64)
{
ASMAtomicXchgU64(pu64, u64);
}
/**
* Atomically writes an unsigned 64-bit value, unordered.
*
* @param pu64 Pointer to the 64-bit variable to write.
* @param u64 The 64-bit value to assign to *pu64.
*/
DECLINLINE(void) ASMAtomicUoWriteU64(volatile uint64_t *pu64, uint64_t u64)
{
Assert(!((uintptr_t)pu64 & 7));
#if ARCH_BITS == 64
*pu64 = u64;
#else
ASMAtomicXchgU64(pu64, u64);
#endif
}
/**
* Atomically writes a signed 64-bit value, ordered.
*
* @param pi64 Pointer to the 64-bit variable to write.
* @param i64 The 64-bit value to assign to *pi64.
*/
DECLINLINE(void) ASMAtomicWriteS64(volatile int64_t *pi64, int64_t i64)
{
ASMAtomicXchgS64(pi64, i64);
}
/**
* Atomically writes a signed 64-bit value, unordered.
*
* @param pi64 Pointer to the 64-bit variable to write.
* @param i64 The 64-bit value to assign to *pi64.
*/
DECLINLINE(void) ASMAtomicUoWriteS64(volatile int64_t *pi64, int64_t i64)
{
Assert(!((uintptr_t)pi64 & 7));
#if ARCH_BITS == 64
*pi64 = i64;
#else
ASMAtomicXchgS64(pi64, i64);
#endif
}
/**
* Atomically writes a boolean value, unordered.
*
* @param pf Pointer to the boolean variable to write.
* @param f The boolean value to assign to *pf.
*/
DECLINLINE(void) ASMAtomicWriteBool(volatile bool *pf, bool f)
{
ASMAtomicWriteU8((uint8_t volatile *)pf, f);
}
/**
* Atomically writes a boolean value, unordered.
*
* @param pf Pointer to the boolean variable to write.
* @param f The boolean value to assign to *pf.
*/
DECLINLINE(void) ASMAtomicUoWriteBool(volatile bool *pf, bool f)
{
*pf = f; /* byte writes are atomic on x86 */
}
/**
* Atomically writes a pointer value, ordered.
*
* @param ppv Pointer to the pointer variable to write.
* @param pv The pointer value to assign to *ppv.
*/
DECLINLINE(void) ASMAtomicWritePtrVoid(void * volatile *ppv, const void *pv)
{
#if ARCH_BITS == 32
ASMAtomicWriteU32((volatile uint32_t *)(void *)ppv, (uint32_t)pv);
#elif ARCH_BITS == 64
ASMAtomicWriteU64((volatile uint64_t *)(void *)ppv, (uint64_t)pv);
#else
# error "ARCH_BITS is bogus"
#endif
}
/**
* Atomically writes a pointer value, ordered.
*
* @param ppv Pointer to the pointer variable to write.
* @param pv The pointer value to assign to *ppv. If NULL use
* ASMAtomicWriteNullPtr or you'll land in trouble.
*
* @remarks This is relatively type safe on GCC platforms when @a pv isn't
* NULL.
*/
#ifdef __GNUC__
# define ASMAtomicWritePtr(ppv, pv) \
do \
{ \
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
__typeof__(*(ppv)) const pvTypeChecked = (pv); \
\
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
AssertCompile(sizeof(pv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
\
ASMAtomicWritePtrVoid((void * volatile *)(ppvTypeChecked), (void *)(pvTypeChecked)); \
} while (0)
#else
# define ASMAtomicWritePtr(ppv, pv) \
do \
{ \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
AssertCompile(sizeof(pv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
\
ASMAtomicWritePtrVoid((void * volatile *)(ppv), (void *)(pv)); \
} while (0)
#endif
/**
* Atomically sets a pointer to NULL, ordered.
*
* @param ppv Pointer to the pointer variable that should be set to NULL.
*
* @remarks This is relatively type safe on GCC platforms.
*/
#ifdef __GNUC__
# define ASMAtomicWriteNullPtr(ppv) \
do \
{ \
__typeof__(*(ppv)) * const ppvTypeChecked = (ppv); \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
ASMAtomicWritePtrVoid((void * volatile *)(ppvTypeChecked), NULL); \
} while (0)
#else
# define ASMAtomicWriteNullPtr(ppv) \
do \
{ \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
ASMAtomicWritePtrVoid((void * volatile *)(ppv), NULL); \
} while (0)
#endif
/**
* Atomically writes a pointer value, unordered.
*
* @returns Current *pv value
* @param ppv Pointer to the pointer variable.
* @param pv The pointer value to assign to *ppv. If NULL use
* ASMAtomicUoWriteNullPtr or you'll land in trouble.
*
* @remarks This is relatively type safe on GCC platforms when @a pv isn't
* NULL.
*/
#ifdef __GNUC__
# define ASMAtomicUoWritePtr(ppv, pv) \
do \
{ \
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
__typeof__(*(ppv)) const pvTypeChecked = (pv); \
\
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
AssertCompile(sizeof(pv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
\
*(ppvTypeChecked) = pvTypeChecked; \
} while (0)
#else
# define ASMAtomicUoWritePtr(ppv, pv) \
do \
{ \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
AssertCompile(sizeof(pv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
*(ppv) = pv; \
} while (0)
#endif
/**
* Atomically sets a pointer to NULL, unordered.
*
* @param ppv Pointer to the pointer variable that should be set to NULL.
*
* @remarks This is relatively type safe on GCC platforms.
*/
#ifdef __GNUC__
# define ASMAtomicUoWriteNullPtr(ppv) \
do \
{ \
__typeof__(*(ppv)) volatile * const ppvTypeChecked = (ppv); \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
*(ppvTypeChecked) = NULL; \
} while (0)
#else
# define ASMAtomicUoWriteNullPtr(ppv) \
do \
{ \
AssertCompile(sizeof(*ppv) == sizeof(void *)); \
Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
*(ppv) = NULL; \
} while (0)
#endif
/**
* Atomically write a typical IPRT handle value, ordered.
*
* @param ph Pointer to the variable to update.
* @param hNew The value to assign to *ph.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicWriteHandle(ph, hNew) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
ASMAtomicWriteU32((uint32_t volatile *)(ph), (const uint32_t)(hNew)); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicWriteHandle(ph, hNew) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
ASMAtomicWriteU64((uint64_t volatile *)(ph), (const uint64_t)(hNew)); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/**
* Atomically write a typical IPRT handle value, unordered.
*
* @param ph Pointer to the variable to update.
* @param hNew The value to assign to *ph.
*
* @remarks This doesn't currently work for all handles (like RTFILE).
*/
#if HC_ARCH_BITS == 32
# define ASMAtomicUoWriteHandle(ph, hNew) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
ASMAtomicUoWriteU32((uint32_t volatile *)(ph), (const uint32_t)hNew); \
} while (0)
#elif HC_ARCH_BITS == 64
# define ASMAtomicUoWriteHandle(ph, hNew) \
do { \
AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
ASMAtomicUoWriteU64((uint64_t volatile *)(ph), (const uint64_t)hNew); \
} while (0)
#else
# error HC_ARCH_BITS
#endif
/**
* Atomically write a value which size might differ
* between platforms or compilers, ordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to assign to *pu.
*/
#define ASMAtomicWriteSize(pu, uNew) \
do { \
switch (sizeof(*(pu))) { \
case 1: ASMAtomicWriteU8( (volatile uint8_t *)(void *)(pu), (uint8_t )(uNew)); break; \
case 2: ASMAtomicWriteU16((volatile uint16_t *)(void *)(pu), (uint16_t)(uNew)); break; \
case 4: ASMAtomicWriteU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: ASMAtomicWriteU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicWriteSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically write a value which size might differ
* between platforms or compilers, unordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to assign to *pu.
*/
#define ASMAtomicUoWriteSize(pu, uNew) \
do { \
switch (sizeof(*(pu))) { \
case 1: ASMAtomicUoWriteU8( (volatile uint8_t *)(void *)(pu), (uint8_t )(uNew)); break; \
case 2: ASMAtomicUoWriteU16((volatile uint16_t *)(void *)(pu), (uint16_t)(uNew)); break; \
case 4: ASMAtomicUoWriteU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: ASMAtomicUoWriteU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicWriteSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically exchanges and adds to a 32-bit value, ordered.
*
* @returns The old value.
* @param pu32 Pointer to the value.
* @param u32 Number to add.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32);
#else
DECLINLINE(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
u32 = _InterlockedExchangeAdd((long *)pu32, u32);
return u32;
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; xaddl %0, %1\n\t"
: "=r" (u32),
"=m" (*pu32)
: "0" (u32),
"m" (*pu32)
: "memory");
return u32;
# else
__asm
{
mov eax, [u32]
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
lock xadd [rdx], eax
# else
mov edx, [pu32]
lock xadd [edx], eax
# endif
mov [u32], eax
}
return u32;
# endif
}
#endif
/**
* Atomically exchanges and adds to a signed 32-bit value, ordered.
*
* @returns The old value.
* @param pi32 Pointer to the value.
* @param i32 Number to add.
*/
DECLINLINE(int32_t) ASMAtomicAddS32(int32_t volatile *pi32, int32_t i32)
{
return (int32_t)ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)i32);
}
/**
* Atomically exchanges and adds to a 64-bit value, ordered.
*
* @returns The old value.
* @param pu64 Pointer to the value.
* @param u64 Number to add.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint64_t) ASMAtomicAddU64(uint64_t volatile *pu64, uint64_t u64);
#else
DECLINLINE(uint64_t) ASMAtomicAddU64(uint64_t volatile *pu64, uint64_t u64)
{
# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
u64 = _InterlockedExchangeAdd64((__int64 *)pu64, u64);
return u64;
# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("lock; xaddq %0, %1\n\t"
: "=r" (u64),
"=m" (*pu64)
: "0" (u64),
"m" (*pu64)
: "memory");
return u64;
# else
uint64_t u64Old;
for (;;)
{
uint64_t u64New;
u64Old = ASMAtomicUoReadU64(pu64);
u64New = u64Old + u64;
if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
break;
ASMNopPause();
}
return u64Old;
# endif
}
#endif
/**
* Atomically exchanges and adds to a signed 64-bit value, ordered.
*
* @returns The old value.
* @param pi64 Pointer to the value.
* @param i64 Number to add.
*/
DECLINLINE(int64_t) ASMAtomicAddS64(int64_t volatile *pi64, int64_t i64)
{
return (int64_t)ASMAtomicAddU64((uint64_t volatile *)pi64, (uint64_t)i64);
}
/**
* Atomically exchanges and adds to a size_t value, ordered.
*
* @returns The old value.
* @param pcb Pointer to the size_t value.
* @param cb Number to add.
*/
DECLINLINE(size_t) ASMAtomicAddZ(size_t volatile *pcb, size_t cb)
{
#if ARCH_BITS == 64
return ASMAtomicAddU64((uint64_t volatile *)pcb, cb);
#elif ARCH_BITS == 32
return ASMAtomicAddU32((uint32_t volatile *)pcb, cb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically exchanges and adds a value which size might differ between
* platforms or compilers, ordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to add to *pu.
* @param puOld Where to store the old value.
*/
#define ASMAtomicAddSize(pu, uNew, puOld) \
do { \
switch (sizeof(*(pu))) { \
case 4: *(uint32_t *)(puOld) = ASMAtomicAddU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: *(uint64_t *)(puOld) = ASMAtomicAddU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicAddSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically exchanges and subtracts to an unsigned 32-bit value, ordered.
*
* @returns The old value.
* @param pu32 Pointer to the value.
* @param u32 Number to subtract.
*/
DECLINLINE(uint32_t) ASMAtomicSubU32(uint32_t volatile *pu32, uint32_t u32)
{
return ASMAtomicAddU32(pu32, (uint32_t)-(int32_t)u32);
}
/**
* Atomically exchanges and subtracts to a signed 32-bit value, ordered.
*
* @returns The old value.
* @param pi32 Pointer to the value.
* @param i32 Number to subtract.
*/
DECLINLINE(int32_t) ASMAtomicSubS32(int32_t volatile *pi32, int32_t i32)
{
return (int32_t)ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)-i32);
}
/**
* Atomically exchanges and subtracts to an unsigned 64-bit value, ordered.
*
* @returns The old value.
* @param pu64 Pointer to the value.
* @param u64 Number to subtract.
*/
DECLINLINE(uint64_t) ASMAtomicSubU64(uint64_t volatile *pu64, uint64_t u64)
{
return ASMAtomicAddU64(pu64, (uint64_t)-(int64_t)u64);
}
/**
* Atomically exchanges and subtracts to a signed 64-bit value, ordered.
*
* @returns The old value.
* @param pi64 Pointer to the value.
* @param i64 Number to subtract.
*/
DECLINLINE(int64_t) ASMAtomicSubS64(int64_t volatile *pi64, int64_t i64)
{
return (int64_t)ASMAtomicAddU64((uint64_t volatile *)pi64, (uint64_t)-i64);
}
/**
* Atomically exchanges and subtracts to a size_t value, ordered.
*
* @returns The old value.
* @param pcb Pointer to the size_t value.
* @param cb Number to subtract.
*/
DECLINLINE(size_t) ASMAtomicSubZ(size_t volatile *pcb, size_t cb)
{
#if ARCH_BITS == 64
return ASMAtomicSubU64((uint64_t volatile *)pcb, cb);
#elif ARCH_BITS == 32
return ASMAtomicSubU32((uint32_t volatile *)pcb, cb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically exchanges and subtracts a value which size might differ between
* platforms or compilers, ordered.
*
* @param pu Pointer to the variable to update.
* @param uNew The value to subtract to *pu.
* @param puOld Where to store the old value.
*/
#define ASMAtomicSubSize(pu, uNew, puOld) \
do { \
switch (sizeof(*(pu))) { \
case 4: *(uint32_t *)(puOld) = ASMAtomicSubU32((volatile uint32_t *)(void *)(pu), (uint32_t)(uNew)); break; \
case 8: *(uint64_t *)(puOld) = ASMAtomicSubU64((volatile uint64_t *)(void *)(pu), (uint64_t)(uNew)); break; \
default: AssertMsgFailed(("ASMAtomicSubSize: size %d is not supported\n", sizeof(*(pu)))); \
} \
} while (0)
/**
* Atomically increment a 32-bit value, ordered.
*
* @returns The new value.
* @param pu32 Pointer to the value to increment.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32);
#else
DECLINLINE(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32)
{
uint32_t u32;
# if RT_INLINE_ASM_USES_INTRIN
u32 = _InterlockedIncrement((long *)pu32);
return u32;
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; xaddl %0, %1\n\t"
: "=r" (u32),
"=m" (*pu32)
: "0" (1),
"m" (*pu32)
: "memory");
return u32+1;
# else
__asm
{
mov eax, 1
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
lock xadd [rdx], eax
# else
mov edx, [pu32]
lock xadd [edx], eax
# endif
mov u32, eax
}
return u32+1;
# endif
}
#endif
/**
* Atomically increment a signed 32-bit value, ordered.
*
* @returns The new value.
* @param pi32 Pointer to the value to increment.
*/
DECLINLINE(int32_t) ASMAtomicIncS32(int32_t volatile *pi32)
{
return (int32_t)ASMAtomicIncU32((uint32_t volatile *)pi32);
}
/**
* Atomically increment a 64-bit value, ordered.
*
* @returns The new value.
* @param pu64 Pointer to the value to increment.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint64_t) ASMAtomicIncU64(uint64_t volatile *pu64);
#else
DECLINLINE(uint64_t) ASMAtomicIncU64(uint64_t volatile *pu64)
{
# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
uint64_t u64;
u64 = _InterlockedIncrement64((__int64 *)pu64);
return u64;
# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
uint64_t u64;
__asm__ __volatile__("lock; xaddq %0, %1\n\t"
: "=r" (u64),
"=m" (*pu64)
: "0" (1),
"m" (*pu64)
: "memory");
return u64 + 1;
# else
return ASMAtomicAddU64(pu64, 1) + 1;
# endif
}
#endif
/**
* Atomically increment a signed 64-bit value, ordered.
*
* @returns The new value.
* @param pi64 Pointer to the value to increment.
*/
DECLINLINE(int64_t) ASMAtomicIncS64(int64_t volatile *pi64)
{
return (int64_t)ASMAtomicIncU64((uint64_t volatile *)pi64);
}
/**
* Atomically increment a size_t value, ordered.
*
* @returns The new value.
* @param pcb Pointer to the value to increment.
*/
DECLINLINE(int64_t) ASMAtomicIncZ(size_t volatile *pcb)
{
#if ARCH_BITS == 64
return ASMAtomicIncU64((uint64_t volatile *)pcb);
#elif ARCH_BITS == 32
return ASMAtomicIncU32((uint32_t volatile *)pcb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically decrement an unsigned 32-bit value, ordered.
*
* @returns The new value.
* @param pu32 Pointer to the value to decrement.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32);
#else
DECLINLINE(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32)
{
uint32_t u32;
# if RT_INLINE_ASM_USES_INTRIN
u32 = _InterlockedDecrement((long *)pu32);
return u32;
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; xaddl %0, %1\n\t"
: "=r" (u32),
"=m" (*pu32)
: "0" (-1),
"m" (*pu32)
: "memory");
return u32-1;
# else
__asm
{
mov eax, -1
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
lock xadd [rdx], eax
# else
mov edx, [pu32]
lock xadd [edx], eax
# endif
mov u32, eax
}
return u32-1;
# endif
}
#endif
/**
* Atomically decrement a signed 32-bit value, ordered.
*
* @returns The new value.
* @param pi32 Pointer to the value to decrement.
*/
DECLINLINE(int32_t) ASMAtomicDecS32(int32_t volatile *pi32)
{
return (int32_t)ASMAtomicDecU32((uint32_t volatile *)pi32);
}
/**
* Atomically decrement an unsigned 64-bit value, ordered.
*
* @returns The new value.
* @param pu64 Pointer to the value to decrement.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint64_t) ASMAtomicDecU64(uint64_t volatile *pu64);
#else
DECLINLINE(uint64_t) ASMAtomicDecU64(uint64_t volatile *pu64)
{
# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
uint64_t u64 = _InterlockedDecrement64((__int64 volatile *)pu64);
return u64;
# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
uint64_t u64;
__asm__ __volatile__("lock; xaddq %q0, %1\n\t"
: "=r" (u64),
"=m" (*pu64)
: "0" (~(uint64_t)0),
"m" (*pu64)
: "memory");
return u64-1;
# else
return ASMAtomicAddU64(pu64, UINT64_MAX) - 1;
# endif
}
#endif
/**
* Atomically decrement a signed 64-bit value, ordered.
*
* @returns The new value.
* @param pi64 Pointer to the value to decrement.
*/
DECLINLINE(int64_t) ASMAtomicDecS64(int64_t volatile *pi64)
{
return (int64_t)ASMAtomicDecU64((uint64_t volatile *)pi64);
}
/**
* Atomically decrement a size_t value, ordered.
*
* @returns The new value.
* @param pcb Pointer to the value to decrement.
*/
DECLINLINE(int64_t) ASMAtomicDecZ(size_t volatile *pcb)
{
#if ARCH_BITS == 64
return ASMAtomicDecU64((uint64_t volatile *)pcb);
#elif ARCH_BITS == 32
return ASMAtomicDecU32((uint32_t volatile *)pcb);
#else
# error "Unsupported ARCH_BITS value"
#endif
}
/**
* Atomically Or an unsigned 32-bit value, ordered.
*
* @param pu32 Pointer to the pointer variable to OR u32 with.
* @param u32 The value to OR *pu32 with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32);
#else
DECLINLINE(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
_InterlockedOr((long volatile *)pu32, (long)u32);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; orl %1, %0\n\t"
: "=m" (*pu32)
: "ir" (u32),
"m" (*pu32));
# else
__asm
{
mov eax, [u32]
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
lock or [rdx], eax
# else
mov edx, [pu32]
lock or [edx], eax
# endif
}
# endif
}
#endif
/**
* Atomically Or a signed 32-bit value, ordered.
*
* @param pi32 Pointer to the pointer variable to OR u32 with.
* @param i32 The value to OR *pu32 with.
*/
DECLINLINE(void) ASMAtomicOrS32(int32_t volatile *pi32, int32_t i32)
{
ASMAtomicOrU32((uint32_t volatile *)pi32, i32);
}
/**
* Atomically Or an unsigned 64-bit value, ordered.
*
* @param pu64 Pointer to the pointer variable to OR u64 with.
* @param u64 The value to OR *pu64 with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMAtomicOrU64(uint64_t volatile *pu64, uint64_t u64);
#else
DECLINLINE(void) ASMAtomicOrU64(uint64_t volatile *pu64, uint64_t u64)
{
# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
_InterlockedOr64((__int64 volatile *)pu64, (__int64)u64);
# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("lock; orq %1, %q0\n\t"
: "=m" (*pu64)
: "r" (u64),
"m" (*pu64));
# else
for (;;)
{
uint64_t u64Old = ASMAtomicUoReadU64(pu64);
uint64_t u64New = u64Old | u64;
if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
break;
ASMNopPause();
}
# endif
}
#endif
/**
* Atomically Or a signed 64-bit value, ordered.
*
* @param pi64 Pointer to the pointer variable to OR u64 with.
* @param i64 The value to OR *pu64 with.
*/
DECLINLINE(void) ASMAtomicOrS64(int64_t volatile *pi64, int64_t i64)
{
ASMAtomicOrU64((uint64_t volatile *)pi64, i64);
}
/**
* Atomically And an unsigned 32-bit value, ordered.
*
* @param pu32 Pointer to the pointer variable to AND u32 with.
* @param u32 The value to AND *pu32 with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32);
#else
DECLINLINE(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
_InterlockedAnd((long volatile *)pu32, u32);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; andl %1, %0\n\t"
: "=m" (*pu32)
: "ir" (u32),
"m" (*pu32));
# else
__asm
{
mov eax, [u32]
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
lock and [rdx], eax
# else
mov edx, [pu32]
lock and [edx], eax
# endif
}
# endif
}
#endif
/**
* Atomically And a signed 32-bit value, ordered.
*
* @param pi32 Pointer to the pointer variable to AND i32 with.
* @param i32 The value to AND *pi32 with.
*/
DECLINLINE(void) ASMAtomicAndS32(int32_t volatile *pi32, int32_t i32)
{
ASMAtomicAndU32((uint32_t volatile *)pi32, (uint32_t)i32);
}
/**
* Atomically And an unsigned 64-bit value, ordered.
*
* @param pu64 Pointer to the pointer variable to AND u64 with.
* @param u64 The value to AND *pu64 with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMAtomicAndU64(uint64_t volatile *pu64, uint64_t u64);
#else
DECLINLINE(void) ASMAtomicAndU64(uint64_t volatile *pu64, uint64_t u64)
{
# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
_InterlockedAnd64((__int64 volatile *)pu64, u64);
# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("lock; andq %1, %0\n\t"
: "=m" (*pu64)
: "r" (u64),
"m" (*pu64));
# else
for (;;)
{
uint64_t u64Old = ASMAtomicUoReadU64(pu64);
uint64_t u64New = u64Old & u64;
if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
break;
ASMNopPause();
}
# endif
}
#endif
/**
* Atomically And a signed 64-bit value, ordered.
*
* @param pi64 Pointer to the pointer variable to AND i64 with.
* @param i64 The value to AND *pi64 with.
*/
DECLINLINE(void) ASMAtomicAndS64(int64_t volatile *pi64, int64_t i64)
{
ASMAtomicAndU64((uint64_t volatile *)pi64, (uint64_t)i64);
}
/**
* Atomically OR an unsigned 32-bit value, unordered but interrupt safe.
*
* @param pu32 Pointer to the pointer variable to OR u32 with.
* @param u32 The value to OR *pu32 with.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicUoOrU32(uint32_t volatile *pu32, uint32_t u32);
#else
DECLINLINE(void) ASMAtomicUoOrU32(uint32_t volatile *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("orl %1, %0\n\t"
: "=m" (*pu32)
: "ir" (u32),
"m" (*pu32));
# else
__asm
{
mov eax, [u32]
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
or [rdx], eax
# else
mov edx, [pu32]
or [edx], eax
# endif
}
# endif
}
#endif
/**
* Atomically OR a signed 32-bit value, unordered.
*
* @param pi32 Pointer to the pointer variable to OR u32 with.
* @param i32 The value to OR *pu32 with.
*/
DECLINLINE(void) ASMAtomicUoOrS32(int32_t volatile *pi32, int32_t i32)
{
ASMAtomicUoOrU32((uint32_t volatile *)pi32, i32);
}
/**
* Atomically OR an unsigned 64-bit value, unordered.
*
* @param pu64 Pointer to the pointer variable to OR u64 with.
* @param u64 The value to OR *pu64 with.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicUoOrU64(uint64_t volatile *pu64, uint64_t u64);
#else
DECLINLINE(void) ASMAtomicUoOrU64(uint64_t volatile *pu64, uint64_t u64)
{
# if RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("orq %1, %q0\n\t"
: "=m" (*pu64)
: "r" (u64),
"m" (*pu64));
# else
for (;;)
{
uint64_t u64Old = ASMAtomicUoReadU64(pu64);
uint64_t u64New = u64Old | u64;
if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
break;
ASMNopPause();
}
# endif
}
#endif
/**
* Atomically Or a signed 64-bit value, unordered.
*
* @param pi64 Pointer to the pointer variable to OR u64 with.
* @param i64 The value to OR *pu64 with.
*/
DECLINLINE(void) ASMAtomicUoOrS64(int64_t volatile *pi64, int64_t i64)
{
ASMAtomicUoOrU64((uint64_t volatile *)pi64, i64);
}
/**
* Atomically And an unsigned 32-bit value, unordered.
*
* @param pu32 Pointer to the pointer variable to AND u32 with.
* @param u32 The value to AND *pu32 with.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicUoAndU32(uint32_t volatile *pu32, uint32_t u32);
#else
DECLINLINE(void) ASMAtomicUoAndU32(uint32_t volatile *pu32, uint32_t u32)
{
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("andl %1, %0\n\t"
: "=m" (*pu32)
: "ir" (u32),
"m" (*pu32));
# else
__asm
{
mov eax, [u32]
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
and [rdx], eax
# else
mov edx, [pu32]
and [edx], eax
# endif
}
# endif
}
#endif
/**
* Atomically And a signed 32-bit value, unordered.
*
* @param pi32 Pointer to the pointer variable to AND i32 with.
* @param i32 The value to AND *pi32 with.
*/
DECLINLINE(void) ASMAtomicUoAndS32(int32_t volatile *pi32, int32_t i32)
{
ASMAtomicUoAndU32((uint32_t volatile *)pi32, (uint32_t)i32);
}
/**
* Atomically And an unsigned 64-bit value, unordered.
*
* @param pu64 Pointer to the pointer variable to AND u64 with.
* @param u64 The value to AND *pu64 with.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicUoAndU64(uint64_t volatile *pu64, uint64_t u64);
#else
DECLINLINE(void) ASMAtomicUoAndU64(uint64_t volatile *pu64, uint64_t u64)
{
# if RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("andq %1, %0\n\t"
: "=m" (*pu64)
: "r" (u64),
"m" (*pu64));
# else
for (;;)
{
uint64_t u64Old = ASMAtomicUoReadU64(pu64);
uint64_t u64New = u64Old & u64;
if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
break;
ASMNopPause();
}
# endif
}
#endif
/**
* Atomically And a signed 64-bit value, unordered.
*
* @param pi64 Pointer to the pointer variable to AND i64 with.
* @param i64 The value to AND *pi64 with.
*/
DECLINLINE(void) ASMAtomicUoAndS64(int64_t volatile *pi64, int64_t i64)
{
ASMAtomicUoAndU64((uint64_t volatile *)pi64, (uint64_t)i64);
}
/**
* Atomically increment an unsigned 32-bit value, unordered.
*
* @returns the new value.
* @param pu32 Pointer to the variable to increment.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint32_t) ASMAtomicUoIncU32(uint32_t volatile *pu32);
#else
DECLINLINE(uint32_t) ASMAtomicUoIncU32(uint32_t volatile *pu32)
{
uint32_t u32;
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("xaddl %0, %1\n\t"
: "=r" (u32),
"=m" (*pu32)
: "0" (1),
"m" (*pu32)
: "memory");
return u32 + 1;
# else
__asm
{
mov eax, 1
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
xadd [rdx], eax
# else
mov edx, [pu32]
xadd [edx], eax
# endif
mov u32, eax
}
return u32 + 1;
# endif
}
#endif
/**
* Atomically decrement an unsigned 32-bit value, unordered.
*
* @returns the new value.
* @param pu32 Pointer to the variable to decrement.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint32_t) ASMAtomicUoDecU32(uint32_t volatile *pu32);
#else
DECLINLINE(uint32_t) ASMAtomicUoDecU32(uint32_t volatile *pu32)
{
uint32_t u32;
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; xaddl %0, %1\n\t"
: "=r" (u32),
"=m" (*pu32)
: "0" (-1),
"m" (*pu32)
: "memory");
return u32 - 1;
# else
__asm
{
mov eax, -1
# ifdef RT_ARCH_AMD64
mov rdx, [pu32]
xadd [rdx], eax
# else
mov edx, [pu32]
xadd [edx], eax
# endif
mov u32, eax
}
return u32 - 1;
# endif
}
#endif
/** @def RT_ASM_PAGE_SIZE
* We try avoid dragging in iprt/param.h here.
* @internal
*/
#if defined(RT_ARCH_SPARC64)
# define RT_ASM_PAGE_SIZE 0x2000
# if defined(PAGE_SIZE) && !defined(NT_INCLUDED)
# if PAGE_SIZE != 0x2000
# error "PAGE_SIZE is not 0x2000!"
# endif
# endif
#else
# define RT_ASM_PAGE_SIZE 0x1000
# if defined(PAGE_SIZE) && !defined(NT_INCLUDED)
# if PAGE_SIZE != 0x1000
# error "PAGE_SIZE is not 0x1000!"
# endif
# endif
#endif
/**
* Zeros a 4K memory page.
*
* @param pv Pointer to the memory block. This must be page aligned.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMMemZeroPage(volatile void *pv);
# else
DECLINLINE(void) ASMMemZeroPage(volatile void *pv)
{
# if RT_INLINE_ASM_USES_INTRIN
# ifdef RT_ARCH_AMD64
__stosq((unsigned __int64 *)pv, 0, RT_ASM_PAGE_SIZE / 8);
# else
__stosd((unsigned long *)pv, 0, RT_ASM_PAGE_SIZE / 4);
# endif
# elif RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG uDummy;
# ifdef RT_ARCH_AMD64
__asm__ __volatile__("rep stosq"
: "=D" (pv),
"=c" (uDummy)
: "0" (pv),
"c" (RT_ASM_PAGE_SIZE >> 3),
"a" (0)
: "memory");
# else
__asm__ __volatile__("rep stosl"
: "=D" (pv),
"=c" (uDummy)
: "0" (pv),
"c" (RT_ASM_PAGE_SIZE >> 2),
"a" (0)
: "memory");
# endif
# else
__asm
{
# ifdef RT_ARCH_AMD64
xor rax, rax
mov ecx, 0200h
mov rdi, [pv]
rep stosq
# else
xor eax, eax
mov ecx, 0400h
mov edi, [pv]
rep stosd
# endif
}
# endif
}
# endif
/**
* Zeros a memory block with a 32-bit aligned size.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMMemZero32(volatile void *pv, size_t cb);
#else
DECLINLINE(void) ASMMemZero32(volatile void *pv, size_t cb)
{
# if RT_INLINE_ASM_USES_INTRIN
# ifdef RT_ARCH_AMD64
if (!(cb & 7))
__stosq((unsigned __int64 *)pv, 0, cb / 8);
else
# endif
__stosd((unsigned long *)pv, 0, cb / 4);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("rep stosl"
: "=D" (pv),
"=c" (cb)
: "0" (pv),
"1" (cb >> 2),
"a" (0)
: "memory");
# else
__asm
{
xor eax, eax
# ifdef RT_ARCH_AMD64
mov rcx, [cb]
shr rcx, 2
mov rdi, [pv]
# else
mov ecx, [cb]
shr ecx, 2
mov edi, [pv]
# endif
rep stosd
}
# endif
}
#endif
/**
* Fills a memory block with a 32-bit aligned size.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
* @param u32 The value to fill with.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMMemFill32(volatile void *pv, size_t cb, uint32_t u32);
#else
DECLINLINE(void) ASMMemFill32(volatile void *pv, size_t cb, uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
# ifdef RT_ARCH_AMD64
if (!(cb & 7))
__stosq((unsigned __int64 *)pv, RT_MAKE_U64(u32, u32), cb / 8);
else
# endif
__stosd((unsigned long *)pv, u32, cb / 4);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("rep stosl"
: "=D" (pv),
"=c" (cb)
: "0" (pv),
"1" (cb >> 2),
"a" (u32)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rcx, [cb]
shr rcx, 2
mov rdi, [pv]
# else
mov ecx, [cb]
shr ecx, 2
mov edi, [pv]
# endif
mov eax, [u32]
rep stosd
}
# endif
}
#endif
/**
* Checks if a memory block is all zeros.
*
* @returns Pointer to the first non-zero byte.
* @returns NULL if all zero.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block.
*
* @todo Fix name, it is a predicate function but it's not returning boolean!
*/
DECLINLINE(void *) ASMMemFirstNonZero(void const *pv, size_t cb)
{
uint8_t const *pb = (uint8_t const *)pv;
for (; cb; cb--, pb++)
if (RT_LIKELY(*pb == 0))
{ /* likely */ }
else
return (void *)pb;
return NULL;
}
/**
* Checks if a memory block is all zeros.
*
* @returns true if zero, false if not.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block.
*
* @sa ASMMemFirstNonZero
*/
DECLINLINE(bool) ASMMemIsZero(void const *pv, size_t cb)
{
return ASMMemFirstNonZero(pv, cb) == NULL;
}
/**
* Checks if a memory page is all zeros.
*
* @returns true / false.
*
* @param pvPage Pointer to the page. Must be aligned on 16 byte
* boundary
*/
DECLINLINE(bool) ASMMemIsZeroPage(void const *pvPage)
{
# if 0 /*RT_INLINE_ASM_GNU_STYLE - this is actually slower... */
union { RTCCUINTREG r; bool f; } uAX;
RTCCUINTREG xCX, xDI;
Assert(!((uintptr_t)pvPage & 15));
__asm__ __volatile__("repe; "
# ifdef RT_ARCH_AMD64
"scasq\n\t"
# else
"scasl\n\t"
# endif
"setnc %%al\n\t"
: "=&c" (xCX),
"=&D" (xDI),
"=&a" (uAX.r)
: "mr" (pvPage),
# ifdef RT_ARCH_AMD64
"0" (RT_ASM_PAGE_SIZE/8),
# else
"0" (RT_ASM_PAGE_SIZE/4),
# endif
"1" (pvPage),
"2" (0));
return uAX.f;
# else
uintptr_t const *puPtr = (uintptr_t const *)pvPage;
int cLeft = RT_ASM_PAGE_SIZE / sizeof(uintptr_t) / 8;
Assert(!((uintptr_t)pvPage & 15));
for (;;)
{
if (puPtr[0]) return false;
if (puPtr[4]) return false;
if (puPtr[2]) return false;
if (puPtr[6]) return false;
if (puPtr[1]) return false;
if (puPtr[5]) return false;
if (puPtr[3]) return false;
if (puPtr[7]) return false;
if (!--cLeft)
return true;
puPtr += 8;
}
return true;
# endif
}
/**
* Checks if a memory block is filled with the specified byte.
*
* This is a sort of inverted memchr.
*
* @returns Pointer to the byte which doesn't equal u8.
* @returns NULL if all equal to u8.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
* @param u8 The value it's supposed to be filled with.
*
* @todo Fix name, it is a predicate function but it's not returning boolean!
*/
DECLINLINE(void *) ASMMemIsAll8(void const *pv, size_t cb, uint8_t u8)
{
/** @todo rewrite this in inline assembly? */
uint8_t const *pb = (uint8_t const *)pv;
for (; cb; cb--, pb++)
if (RT_LIKELY(*pb == u8))
{ /* likely */ }
else
return (void *)pb;
return NULL;
}
/**
* Checks if a memory block is filled with the specified 32-bit value.
*
* This is a sort of inverted memchr.
*
* @returns Pointer to the first value which doesn't equal u32.
* @returns NULL if all equal to u32.
*
* @param pv Pointer to the memory block.
* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
* @param u32 The value it's supposed to be filled with.
*
* @todo Fix name, it is a predicate function but it's not returning boolean!
*/
DECLINLINE(uint32_t *) ASMMemIsAllU32(void const *pv, size_t cb, uint32_t u32)
{
/** @todo rewrite this in inline assembly? */
uint32_t const *pu32 = (uint32_t const *)pv;
for (; cb; cb -= 4, pu32++)
if (RT_LIKELY(*pu32 == u32))
{ /* likely */ }
else
return (uint32_t *)pu32;
return NULL;
}
/**
* Probes a byte pointer for read access.
*
* While the function will not fault if the byte is not read accessible,
* the idea is to do this in a safe place like before acquiring locks
* and such like.
*
* Also, this functions guarantees that an eager compiler is not going
* to optimize the probing away.
*
* @param pvByte Pointer to the byte.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(uint8_t) ASMProbeReadByte(const void *pvByte);
#else
DECLINLINE(uint8_t) ASMProbeReadByte(const void *pvByte)
{
/** @todo verify that the compiler actually doesn't optimize this away. (intel & gcc) */
uint8_t u8;
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("movb (%1), %0\n\t"
: "=r" (u8)
: "r" (pvByte));
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvByte]
mov al, [rax]
# else
mov eax, [pvByte]
mov al, [eax]
# endif
mov [u8], al
}
# endif
return u8;
}
#endif
/**
* Probes a buffer for read access page by page.
*
* While the function will fault if the buffer is not fully read
* accessible, the idea is to do this in a safe place like before
* acquiring locks and such like.
*
* Also, this functions guarantees that an eager compiler is not going
* to optimize the probing away.
*
* @param pvBuf Pointer to the buffer.
* @param cbBuf The size of the buffer in bytes. Must be >= 1.
*/
DECLINLINE(void) ASMProbeReadBuffer(const void *pvBuf, size_t cbBuf)
{
/** @todo verify that the compiler actually doesn't optimize this away. (intel & gcc) */
/* the first byte */
const uint8_t *pu8 = (const uint8_t *)pvBuf;
ASMProbeReadByte(pu8);
/* the pages in between pages. */
while (cbBuf > RT_ASM_PAGE_SIZE)
{
ASMProbeReadByte(pu8);
cbBuf -= RT_ASM_PAGE_SIZE;
pu8 += RT_ASM_PAGE_SIZE;
}
/* the last byte */
ASMProbeReadByte(pu8 + cbBuf - 1);
}
/** @defgroup grp_inline_bits Bit Operations
* @{
*/
/**
* Sets a bit in a bitmap.
*
* @param pvBitmap Pointer to the bitmap. This should be 32-bit aligned.
* @param iBit The bit to set.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit)
{
# if RT_INLINE_ASM_USES_INTRIN
_bittestandset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btsl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
bts [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
bts [eax], edx
# endif
}
# endif
}
#endif
/**
* Atomically sets a bit in a bitmap, ordered.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to set.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit)
{
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_USES_INTRIN
_interlockedbittestandset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btsl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
lock bts [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
lock bts [eax], edx
# endif
}
# endif
}
#endif
/**
* Clears a bit in a bitmap.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to clear.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit)
{
# if RT_INLINE_ASM_USES_INTRIN
_bittestandreset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btrl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
btr [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
btr [eax], edx
# endif
}
# endif
}
#endif
/**
* Atomically clears a bit in a bitmap, ordered.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to toggle set.
* @remarks No memory barrier, take care on smp.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit)
{
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btrl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
lock btr [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
lock btr [eax], edx
# endif
}
# endif
}
#endif
/**
* Toggles a bit in a bitmap.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to toggle.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit)
{
# if RT_INLINE_ASM_USES_INTRIN
_bittestandcomplement((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btcl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
btc [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
btc [eax], edx
# endif
}
# endif
}
#endif
/**
* Atomically toggles a bit in a bitmap, ordered.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to test and set.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit)
{
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btcl %1, %0"
: "=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
mov edx, [iBit]
lock btc [rax], edx
# else
mov eax, [pvBitmap]
mov edx, [iBit]
lock btc [eax], edx
# endif
}
# endif
}
#endif
/**
* Tests and sets a bit in a bitmap.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to test and set.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
# if RT_INLINE_ASM_USES_INTRIN
rc.u8 = _bittestandset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btsl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
bts [rax], edx
# else
mov eax, [pvBitmap]
bts [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Atomically tests and sets a bit in a bitmap, ordered.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to set.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_USES_INTRIN
rc.u8 = _interlockedbittestandset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btsl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
lock bts [rax], edx
# else
mov eax, [pvBitmap]
lock bts [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Tests and clears a bit in a bitmap.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to test and clear.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
# if RT_INLINE_ASM_USES_INTRIN
rc.u8 = _bittestandreset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btrl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
btr [rax], edx
# else
mov eax, [pvBitmap]
btr [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Atomically tests and clears a bit in a bitmap, ordered.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to test and clear.
*
* @remarks No memory barrier, take care on smp.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_USES_INTRIN
rc.u8 = _interlockedbittestandreset((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btrl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
lock btr [rax], edx
# else
mov eax, [pvBitmap]
lock btr [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Tests and toggles a bit in a bitmap.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to test and toggle.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
# if RT_INLINE_ASM_USES_INTRIN
rc.u8 = _bittestandcomplement((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btcl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
btc [rax], edx
# else
mov eax, [pvBitmap]
btc [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Atomically tests and toggles a bit in a bitmap, ordered.
*
* @returns true if the bit was set.
* @returns false if the bit was clear.
*
* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
* the memory access isn't atomic!
* @param iBit The bit to test and toggle.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("lock; btcl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32),
"=m" (*(volatile long *)pvBitmap)
: "Ir" (iBit),
"m" (*(volatile long *)pvBitmap)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
lock btc [rax], edx
# else
mov eax, [pvBitmap]
lock btc [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Tests if a bit in a bitmap is set.
*
* @returns true if the bit is set.
* @returns false if the bit is clear.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBit The bit to test.
*
* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
* However, doing so will yield better performance as well as avoiding
* traps accessing the last bits in the bitmap.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit);
#else
DECLINLINE(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit)
{
union { bool f; uint32_t u32; uint8_t u8; } rc;
# if RT_INLINE_ASM_USES_INTRIN
rc.u32 = _bittest((long *)pvBitmap, iBit);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("btl %2, %1\n\t"
"setc %b0\n\t"
"andl $1, %0\n\t"
: "=q" (rc.u32)
: "m" (*(const volatile long *)pvBitmap),
"Ir" (iBit)
: "memory");
# else
__asm
{
mov edx, [iBit]
# ifdef RT_ARCH_AMD64
mov rax, [pvBitmap]
bt [rax], edx
# else
mov eax, [pvBitmap]
bt [eax], edx
# endif
setc al
and eax, 1
mov [rc.u32], eax
}
# endif
return rc.f;
}
#endif
/**
* Clears a bit range within a bitmap.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBitStart The First bit to clear.
* @param iBitEnd The first bit not to clear.
*/
DECLINLINE(void) ASMBitClearRange(volatile void *pvBitmap, int32_t iBitStart, int32_t iBitEnd)
{
if (iBitStart < iBitEnd)
{
volatile uint32_t *pu32 = (volatile uint32_t *)pvBitmap + (iBitStart >> 5);
int iStart = iBitStart & ~31;
int iEnd = iBitEnd & ~31;
if (iStart == iEnd)
*pu32 &= ((1U << (iBitStart & 31)) - 1) | ~((1U << (iBitEnd & 31)) - 1);
else
{
/* bits in first dword. */
if (iBitStart & 31)
{
*pu32 &= (1U << (iBitStart & 31)) - 1;
pu32++;
iBitStart = iStart + 32;
}
/* whole dword. */
if (iBitStart != iEnd)
ASMMemZero32(pu32, (iEnd - iBitStart) >> 3);
/* bits in last dword. */
if (iBitEnd & 31)
{
pu32 = (volatile uint32_t *)pvBitmap + (iBitEnd >> 5);
*pu32 &= ~((1U << (iBitEnd & 31)) - 1);
}
}
}
}
/**
* Sets a bit range within a bitmap.
*
* @param pvBitmap Pointer to the bitmap.
* @param iBitStart The First bit to set.
* @param iBitEnd The first bit not to set.
*/
DECLINLINE(void) ASMBitSetRange(volatile void *pvBitmap, int32_t iBitStart, int32_t iBitEnd)
{
if (iBitStart < iBitEnd)
{
volatile uint32_t *pu32 = (volatile uint32_t *)pvBitmap + (iBitStart >> 5);
int iStart = iBitStart & ~31;
int iEnd = iBitEnd & ~31;
if (iStart == iEnd)
*pu32 |= ((1U << (iBitEnd - iBitStart)) - 1) << (iBitStart & 31);
else
{
/* bits in first dword. */
if (iBitStart & 31)
{
*pu32 |= ~((1U << (iBitStart & 31)) - 1);
pu32++;
iBitStart = iStart + 32;
}
/* whole dword. */
if (iBitStart != iEnd)
ASMMemFill32(pu32, (iEnd - iBitStart) >> 3, ~UINT32_C(0));
/* bits in last dword. */
if (iBitEnd & 31)
{
pu32 = (volatile uint32_t *)pvBitmap + (iBitEnd >> 5);
*pu32 |= (1U << (iBitEnd & 31)) - 1;
}
}
}
}
/**
* Finds the first clear bit in a bitmap.
*
* @returns Index of the first zero bit.
* @returns -1 if no clear bit was found.
* @param pvBitmap Pointer to the bitmap.
* @param cBits The number of bits in the bitmap. Multiple of 32.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(int) ASMBitFirstClear(const volatile void *pvBitmap, uint32_t cBits);
#else
DECLINLINE(int) ASMBitFirstClear(const volatile void *pvBitmap, uint32_t cBits)
{
if (cBits)
{
int32_t iBit;
# if RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG uEAX, uECX, uEDI;
cBits = RT_ALIGN_32(cBits, 32);
__asm__ __volatile__("repe; scasl\n\t"
"je 1f\n\t"
# ifdef RT_ARCH_AMD64
"lea -4(%%rdi), %%rdi\n\t"
"xorl (%%rdi), %%eax\n\t"
"subq %5, %%rdi\n\t"
# else
"lea -4(%%edi), %%edi\n\t"
"xorl (%%edi), %%eax\n\t"
"subl %5, %%edi\n\t"
# endif
"shll $3, %%edi\n\t"
"bsfl %%eax, %%edx\n\t"
"addl %%edi, %%edx\n\t"
"1:\t\n"
: "=d" (iBit),
"=&c" (uECX),
"=&D" (uEDI),
"=&a" (uEAX)
: "0" (0xffffffff),
"mr" (pvBitmap),
"1" (cBits >> 5),
"2" (pvBitmap),
"3" (0xffffffff));
# else
cBits = RT_ALIGN_32(cBits, 32);
__asm
{
# ifdef RT_ARCH_AMD64
mov rdi, [pvBitmap]
mov rbx, rdi
# else
mov edi, [pvBitmap]
mov ebx, edi
# endif
mov edx, 0ffffffffh
mov eax, edx
mov ecx, [cBits]
shr ecx, 5
repe scasd
je done
# ifdef RT_ARCH_AMD64
lea rdi, [rdi - 4]
xor eax, [rdi]
sub rdi, rbx
# else
lea edi, [edi - 4]
xor eax, [edi]
sub edi, ebx
# endif
shl edi, 3
bsf edx, eax
add edx, edi
done:
mov [iBit], edx
}
# endif
return iBit;
}
return -1;
}
#endif
/**
* Finds the next clear bit in a bitmap.
*
* @returns Index of the first zero bit.
* @returns -1 if no clear bit was found.
* @param pvBitmap Pointer to the bitmap.
* @param cBits The number of bits in the bitmap. Multiple of 32.
* @param iBitPrev The bit returned from the last search.
* The search will start at iBitPrev + 1.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(int) ASMBitNextClear(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev);
#else
DECLINLINE(int) ASMBitNextClear(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
{
const volatile uint32_t *pau32Bitmap = (const volatile uint32_t *)pvBitmap;
int iBit = ++iBitPrev & 31;
if (iBit)
{
/*
* Inspect the 32-bit word containing the unaligned bit.
*/
uint32_t u32 = ~pau32Bitmap[iBitPrev / 32] >> iBit;
# if RT_INLINE_ASM_USES_INTRIN
unsigned long ulBit = 0;
if (_BitScanForward(&ulBit, u32))
return ulBit + iBitPrev;
# else
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("bsf %1, %0\n\t"
"jnz 1f\n\t"
"movl $-1, %0\n\t"
"1:\n\t"
: "=r" (iBit)
: "r" (u32));
# else
__asm
{
mov edx, [u32]
bsf eax, edx
jnz done
mov eax, 0ffffffffh
done:
mov [iBit], eax
}
# endif
if (iBit >= 0)
return iBit + iBitPrev;
# endif
/*
* Skip ahead and see if there is anything left to search.
*/
iBitPrev |= 31;
iBitPrev++;
if (cBits <= (uint32_t)iBitPrev)
return -1;
}
/*
* 32-bit aligned search, let ASMBitFirstClear do the dirty work.
*/
iBit = ASMBitFirstClear(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
if (iBit >= 0)
iBit += iBitPrev;
return iBit;
}
#endif
/**
* Finds the first set bit in a bitmap.
*
* @returns Index of the first set bit.
* @returns -1 if no clear bit was found.
* @param pvBitmap Pointer to the bitmap.
* @param cBits The number of bits in the bitmap. Multiple of 32.
*/
#if RT_INLINE_ASM_EXTERNAL
DECLASM(int) ASMBitFirstSet(const volatile void *pvBitmap, uint32_t cBits);
#else
DECLINLINE(int) ASMBitFirstSet(const volatile void *pvBitmap, uint32_t cBits)
{
if (cBits)
{
int32_t iBit;
# if RT_INLINE_ASM_GNU_STYLE
RTCCUINTREG uEAX, uECX, uEDI;
cBits = RT_ALIGN_32(cBits, 32);
__asm__ __volatile__("repe; scasl\n\t"
"je 1f\n\t"
# ifdef RT_ARCH_AMD64
"lea -4(%%rdi), %%rdi\n\t"
"movl (%%rdi), %%eax\n\t"
"subq %5, %%rdi\n\t"
# else
"lea -4(%%edi), %%edi\n\t"
"movl (%%edi), %%eax\n\t"
"subl %5, %%edi\n\t"
# endif
"shll $3, %%edi\n\t"
"bsfl %%eax, %%edx\n\t"
"addl %%edi, %%edx\n\t"
"1:\t\n"
: "=d" (iBit),
"=&c" (uECX),
"=&D" (uEDI),
"=&a" (uEAX)
: "0" (0xffffffff),
"mr" (pvBitmap),
"1" (cBits >> 5),
"2" (pvBitmap),
"3" (0));
# else
cBits = RT_ALIGN_32(cBits, 32);
__asm
{
# ifdef RT_ARCH_AMD64
mov rdi, [pvBitmap]
mov rbx, rdi
# else
mov edi, [pvBitmap]
mov ebx, edi
# endif
mov edx, 0ffffffffh
xor eax, eax
mov ecx, [cBits]
shr ecx, 5
repe scasd
je done
# ifdef RT_ARCH_AMD64
lea rdi, [rdi - 4]
mov eax, [rdi]
sub rdi, rbx
# else
lea edi, [edi - 4]
mov eax, [edi]
sub edi, ebx
# endif
shl edi, 3
bsf edx, eax
add edx, edi
done:
mov [iBit], edx
}
# endif
return iBit;
}
return -1;
}
#endif
/**
* Finds the next set bit in a bitmap.
*
* @returns Index of the next set bit.
* @returns -1 if no set bit was found.
* @param pvBitmap Pointer to the bitmap.
* @param cBits The number of bits in the bitmap. Multiple of 32.
* @param iBitPrev The bit returned from the last search.
* The search will start at iBitPrev + 1.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(int) ASMBitNextSet(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev);
#else
DECLINLINE(int) ASMBitNextSet(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
{
const volatile uint32_t *pau32Bitmap = (const volatile uint32_t *)pvBitmap;
int iBit = ++iBitPrev & 31;
if (iBit)
{
/*
* Inspect the 32-bit word containing the unaligned bit.
*/
uint32_t u32 = pau32Bitmap[iBitPrev / 32] >> iBit;
# if RT_INLINE_ASM_USES_INTRIN
unsigned long ulBit = 0;
if (_BitScanForward(&ulBit, u32))
return ulBit + iBitPrev;
# else
# if RT_INLINE_ASM_GNU_STYLE
__asm__ __volatile__("bsf %1, %0\n\t"
"jnz 1f\n\t"
"movl $-1, %0\n\t"
"1:\n\t"
: "=r" (iBit)
: "r" (u32));
# else
__asm
{
mov edx, [u32]
bsf eax, edx
jnz done
mov eax, 0ffffffffh
done:
mov [iBit], eax
}
# endif
if (iBit >= 0)
return iBit + iBitPrev;
# endif
/*
* Skip ahead and see if there is anything left to search.
*/
iBitPrev |= 31;
iBitPrev++;
if (cBits <= (uint32_t)iBitPrev)
return -1;
}
/*
* 32-bit aligned search, let ASMBitFirstClear do the dirty work.
*/
iBit = ASMBitFirstSet(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
if (iBit >= 0)
iBit += iBitPrev;
return iBit;
}
#endif
/**
* Finds the first bit which is set in the given 32-bit integer.
* Bits are numbered from 1 (least significant) to 32.
*
* @returns index [1..32] of the first set bit.
* @returns 0 if all bits are cleared.
* @param u32 Integer to search for set bits.
* @remarks Similar to ffs() in BSD.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(unsigned) ASMBitFirstSetU32(uint32_t u32);
#else
DECLINLINE(unsigned) ASMBitFirstSetU32(uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
unsigned long iBit;
if (_BitScanForward(&iBit, u32))
iBit++;
else
iBit = 0;
# elif RT_INLINE_ASM_GNU_STYLE
uint32_t iBit;
__asm__ __volatile__("bsf %1, %0\n\t"
"jnz 1f\n\t"
"xorl %0, %0\n\t"
"jmp 2f\n"
"1:\n\t"
"incl %0\n"
"2:\n\t"
: "=r" (iBit)
: "rm" (u32));
# else
uint32_t iBit;
_asm
{
bsf eax, [u32]
jnz found
xor eax, eax
jmp done
found:
inc eax
done:
mov [iBit], eax
}
# endif
return iBit;
}
#endif
/**
* Finds the first bit which is set in the given 32-bit integer.
* Bits are numbered from 1 (least significant) to 32.
*
* @returns index [1..32] of the first set bit.
* @returns 0 if all bits are cleared.
* @param i32 Integer to search for set bits.
* @remark Similar to ffs() in BSD.
*/
DECLINLINE(unsigned) ASMBitFirstSetS32(int32_t i32)
{
return ASMBitFirstSetU32((uint32_t)i32);
}
/**
* Finds the first bit which is set in the given 64-bit integer.
*
* Bits are numbered from 1 (least significant) to 64.
*
* @returns index [1..64] of the first set bit.
* @returns 0 if all bits are cleared.
* @param u64 Integer to search for set bits.
* @remarks Similar to ffs() in BSD.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(unsigned) ASMBitFirstSetU64(uint64_t u64);
#else
DECLINLINE(unsigned) ASMBitFirstSetU64(uint64_t u64)
{
# if RT_INLINE_ASM_USES_INTRIN
unsigned long iBit;
# if ARCH_BITS == 64
if (_BitScanForward64(&iBit, u64))
iBit++;
else
iBit = 0;
# else
if (_BitScanForward(&iBit, (uint32_t)u64))
iBit++;
else if (_BitScanForward(&iBit, (uint32_t)(u64 >> 32)))
iBit += 33;
else
iBit = 0;
# endif
# elif RT_INLINE_ASM_GNU_STYLE && ARCH_BITS == 64
uint64_t iBit;
__asm__ __volatile__("bsfq %1, %0\n\t"
"jnz 1f\n\t"
"xorl %k0, %k0\n\t"
"jmp 2f\n"
"1:\n\t"
"incl %k0\n"
"2:\n\t"
: "=r" (iBit)
: "rm" (u64));
# else
unsigned iBit = ASMBitFirstSetU32((uint32_t)u64);
if (!iBit)
{
iBit = ASMBitFirstSetU32((uint32_t)(u64 >> 32));
if (iBit)
iBit += 32;
}
# endif
return (unsigned)iBit;
}
#endif
/**
* Finds the first bit which is set in the given 16-bit integer.
*
* Bits are numbered from 1 (least significant) to 16.
*
* @returns index [1..16] of the first set bit.
* @returns 0 if all bits are cleared.
* @param u16 Integer to search for set bits.
* @remarks For 16-bit bs3kit code.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(unsigned) ASMBitFirstSetU16(uint32_t u16);
#else
DECLINLINE(unsigned) ASMBitFirstSetU16(uint32_t u16)
{
return ASMBitFirstSetU32((uint32_t)u16);
}
#endif
/**
* Finds the last bit which is set in the given 32-bit integer.
* Bits are numbered from 1 (least significant) to 32.
*
* @returns index [1..32] of the last set bit.
* @returns 0 if all bits are cleared.
* @param u32 Integer to search for set bits.
* @remark Similar to fls() in BSD.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(unsigned) ASMBitLastSetU32(uint32_t u32);
#else
DECLINLINE(unsigned) ASMBitLastSetU32(uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
unsigned long iBit;
if (_BitScanReverse(&iBit, u32))
iBit++;
else
iBit = 0;
# elif RT_INLINE_ASM_GNU_STYLE
uint32_t iBit;
__asm__ __volatile__("bsrl %1, %0\n\t"
"jnz 1f\n\t"
"xorl %0, %0\n\t"
"jmp 2f\n"
"1:\n\t"
"incl %0\n"
"2:\n\t"
: "=r" (iBit)
: "rm" (u32));
# else
uint32_t iBit;
_asm
{
bsr eax, [u32]
jnz found
xor eax, eax
jmp done
found:
inc eax
done:
mov [iBit], eax
}
# endif
return iBit;
}
#endif
/**
* Finds the last bit which is set in the given 32-bit integer.
* Bits are numbered from 1 (least significant) to 32.
*
* @returns index [1..32] of the last set bit.
* @returns 0 if all bits are cleared.
* @param i32 Integer to search for set bits.
* @remark Similar to fls() in BSD.
*/
DECLINLINE(unsigned) ASMBitLastSetS32(int32_t i32)
{
return ASMBitLastSetU32((uint32_t)i32);
}
/**
* Finds the last bit which is set in the given 64-bit integer.
*
* Bits are numbered from 1 (least significant) to 64.
*
* @returns index [1..64] of the last set bit.
* @returns 0 if all bits are cleared.
* @param u64 Integer to search for set bits.
* @remark Similar to fls() in BSD.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(unsigned) ASMBitLastSetU64(uint64_t u64);
#else
DECLINLINE(unsigned) ASMBitLastSetU64(uint64_t u64)
{
# if RT_INLINE_ASM_USES_INTRIN
unsigned long iBit;
# if ARCH_BITS == 64
if (_BitScanReverse64(&iBit, u64))
iBit++;
else
iBit = 0;
# else
if (_BitScanReverse(&iBit, (uint32_t)(u64 >> 32)))
iBit += 33;
else if (_BitScanReverse(&iBit, (uint32_t)u64))
iBit++;
else
iBit = 0;
# endif
# elif RT_INLINE_ASM_GNU_STYLE && ARCH_BITS == 64
uint64_t iBit;
__asm__ __volatile__("bsrq %1, %0\n\t"
"jnz 1f\n\t"
"xorl %k0, %k0\n\t"
"jmp 2f\n"
"1:\n\t"
"incl %k0\n"
"2:\n\t"
: "=r" (iBit)
: "rm" (u64));
# else
unsigned iBit = ASMBitLastSetU32((uint32_t)(u64 >> 32));
if (iBit)
iBit += 32;
else
iBit = ASMBitLastSetU32((uint32_t)u64);
#endif
return (unsigned)iBit;
}
#endif
/**
* Reverse the byte order of the given 16-bit integer.
*
* @returns Revert
* @param u16 16-bit integer value.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint16_t) ASMByteSwapU16(uint16_t u16);
#else
DECLINLINE(uint16_t) ASMByteSwapU16(uint16_t u16)
{
# if RT_INLINE_ASM_USES_INTRIN
u16 = _byteswap_ushort(u16);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ ("rorw $8, %0" : "=r" (u16) : "0" (u16));
# else
_asm
{
mov ax, [u16]
ror ax, 8
mov [u16], ax
}
# endif
return u16;
}
#endif
/**
* Reverse the byte order of the given 32-bit integer.
*
* @returns Revert
* @param u32 32-bit integer value.
*/
#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
DECLASM(uint32_t) ASMByteSwapU32(uint32_t u32);
#else
DECLINLINE(uint32_t) ASMByteSwapU32(uint32_t u32)
{
# if RT_INLINE_ASM_USES_INTRIN
u32 = _byteswap_ulong(u32);
# elif RT_INLINE_ASM_GNU_STYLE
__asm__ ("bswapl %0" : "=r" (u32) : "0" (u32));
# else
_asm
{
mov eax, [u32]
bswap eax
mov [u32], eax
}
# endif
return u32;
}
#endif
/**
* Reverse the byte order of the given 64-bit integer.
*
* @returns Revert
* @param u64 64-bit integer value.
*/
DECLINLINE(uint64_t) ASMByteSwapU64(uint64_t u64)
{
#if defined(RT_ARCH_AMD64) && RT_INLINE_ASM_USES_INTRIN
u64 = _byteswap_uint64(u64);
#else
u64 = (uint64_t)ASMByteSwapU32((uint32_t)u64) << 32
| (uint64_t)ASMByteSwapU32((uint32_t)(u64 >> 32));
#endif
return u64;
}
/**
* Rotate 32-bit unsigned value to the left by @a cShift.
*
* @returns Rotated value.
* @param u32 The value to rotate.
* @param cShift How many bits to rotate by.
*/
DECLINLINE(uint32_t) ASMRotateLeftU32(uint32_t u32, uint32_t cShift)
{
#if RT_INLINE_ASM_USES_INTRIN
return _rotl(u32, cShift);
#elif RT_INLINE_ASM_GNU_STYLE && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
__asm__ __volatile__("roll %b1, %0" : "=g" (u32) : "Ic" (cShift), "0" (u32));
return u32;
#else
cShift &= 31;
return (u32 << cShift) | (u32 >> (32 - cShift));
#endif
}
/**
* Rotate 32-bit unsigned value to the right by @a cShift.
*
* @returns Rotated value.
* @param u32 The value to rotate.
* @param cShift How many bits to rotate by.
*/
DECLINLINE(uint32_t) ASMRotateRightU32(uint32_t u32, uint32_t cShift)
{
#if RT_INLINE_ASM_USES_INTRIN
return _rotr(u32, cShift);
#elif RT_INLINE_ASM_GNU_STYLE && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
__asm__ __volatile__("rorl %b1, %0" : "=g" (u32) : "Ic" (cShift), "0" (u32));
return u32;
#else
cShift &= 31;
return (u32 >> cShift) | (u32 << (32 - cShift));
#endif
}
/**
* Rotate 64-bit unsigned value to the left by @a cShift.
*
* @returns Rotated value.
* @param u64 The value to rotate.
* @param cShift How many bits to rotate by.
*/
DECLINLINE(uint64_t) ASMRotateLeftU64(uint64_t u64, uint32_t cShift)
{
#if RT_INLINE_ASM_USES_INTRIN
return _rotl64(u64, cShift);
#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("rolq %b1, %0" : "=g" (u64) : "Jc" (cShift), "0" (u64));
return u64;
#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_X86)
uint32_t uSpill;
__asm__ __volatile__("testb $0x20, %%cl\n\t" /* if (cShift >= 0x20) { swap(u64.hi, u64lo); cShift -= 0x20; } */
"jz 1f\n\t"
"xchgl %%eax, %%edx\n\t"
"1:\n\t"
"andb $0x1f, %%cl\n\t" /* if (cShift & 0x1f) { */
"jz 2f\n\t"
"movl %%edx, %2\n\t" /* save the hi value in %3. */
"shldl %%cl,%%eax,%%edx\n\t" /* shift the hi value left, feeding MSBits from the low value. */
"shldl %%cl,%2,%%eax\n\t" /* shift the lo value left, feeding MSBits from the saved hi value. */
"2:\n\t" /* } */
: "=A" (u64), "=c" (cShift), "=r" (uSpill)
: "0" (u64),
"1" (cShift));
return u64;
#else
cShift &= 63;
return (u64 << cShift) | (u64 >> (64 - cShift));
#endif
}
/**
* Rotate 64-bit unsigned value to the right by @a cShift.
*
* @returns Rotated value.
* @param u64 The value to rotate.
* @param cShift How many bits to rotate by.
*/
DECLINLINE(uint64_t) ASMRotateRightU64(uint64_t u64, uint32_t cShift)
{
#if RT_INLINE_ASM_USES_INTRIN
return _rotr64(u64, cShift);
#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
__asm__ __volatile__("rorq %b1, %0" : "=g" (u64) : "Jc" (cShift), "0" (u64));
return u64;
#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_X86)
uint32_t uSpill;
__asm__ __volatile__("testb $0x20, %%cl\n\t" /* if (cShift >= 0x20) { swap(u64.hi, u64lo); cShift -= 0x20; } */
"jz 1f\n\t"
"xchgl %%eax, %%edx\n\t"
"1:\n\t"
"andb $0x1f, %%cl\n\t" /* if (cShift & 0x1f) { */
"jz 2f\n\t"
"movl %%edx, %2\n\t" /* save the hi value in %3. */
"shrdl %%cl,%%eax,%%edx\n\t" /* shift the hi value right, feeding LSBits from the low value. */
"shrdl %%cl,%2,%%eax\n\t" /* shift the lo value right, feeding LSBits from the saved hi value. */
"2:\n\t" /* } */
: "=A" (u64), "=c" (cShift), "=r" (uSpill)
: "0" (u64),
"1" (cShift));
return u64;
#else
cShift &= 63;
return (u64 >> cShift) | (u64 << (64 - cShift));
#endif
}
/** @} */
/** @} */
#endif