/usr/include/atomic_ops/sysdeps/msftc/x86.h is in libatomic-ops-dev 7.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2003 Hewlett-Packard Development Company, L.P.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/* If AO_ASSUME_WINDOWS98 is defined, we assume Windows 98 or newer. */
/* If AO_ASSUME_VISTA is defined, we assume Windows Server 2003, Vista */
/* or later. */
#include "../all_aligned_atomic_load_store.h"
#include "../test_and_set_t_is_char.h"
#if defined(AO_ASSUME_VISTA) && !defined(AO_ASSUME_WINDOWS98)
# define AO_ASSUME_WINDOWS98
#endif
#ifndef AO_USE_INTERLOCKED_INTRINSICS
/* _Interlocked primitives (Inc, Dec, Xchg, Add) are always available */
# define AO_USE_INTERLOCKED_INTRINSICS
#endif
#include "common32_defs.h"
/* As far as we can tell, the lfence and sfence instructions are not */
/* currently needed or useful for cached memory accesses. */
/* Unfortunately mfence doesn't exist everywhere. */
/* IsProcessorFeaturePresent(PF_COMPARE_EXCHANGE128) is */
/* probably a conservative test for it? */
#if defined(AO_USE_PENTIUM4_INSTRS)
AO_INLINE void
AO_nop_full(void)
{
__asm { mfence }
}
#define AO_HAVE_nop_full
#else
/* We could use the cpuid instruction. But that seems to be slower */
/* than the default implementation based on test_and_set_full. Thus */
/* we omit that bit of misinformation here. */
#endif
#ifndef AO_NO_ASM_XADD
AO_INLINE unsigned char
AO_char_fetch_and_add_full(volatile unsigned char *p, unsigned char incr)
{
__asm
{
mov al, incr
mov ebx, p
lock xadd byte ptr [ebx], al
}
/* Ignore possible "missing return value" warning here. */
}
# define AO_HAVE_char_fetch_and_add_full
AO_INLINE unsigned short
AO_short_fetch_and_add_full(volatile unsigned short *p, unsigned short incr)
{
__asm
{
mov ax, incr
mov ebx, p
lock xadd word ptr [ebx], ax
}
/* Ignore possible "missing return value" warning here. */
}
# define AO_HAVE_short_fetch_and_add_full
#endif /* !AO_NO_ASM_XADD */
AO_INLINE AO_TS_VAL_t
AO_test_and_set_full(volatile AO_TS_t *addr)
{
__asm
{
mov eax,0xff ; /* AO_TS_SET */
mov ebx,addr ;
xchg byte ptr [ebx],al ;
}
/* Ignore possible "missing return value" warning here. */
}
#define AO_HAVE_test_and_set_full
#ifdef _WIN64
# error wrong architecture
#endif
#ifdef AO_ASSUME_VISTA
# include "../standard_ao_double_t.h"
/* Reading or writing a quadword aligned on a 64-bit boundary is */
/* always carried out atomically (requires at least a Pentium). */
# define AO_ACCESS_double_CHECK_ALIGNED
# include "../loadstore/double_atomic_load_store.h"
/* Whenever we run on a Pentium class machine, we have that certain */
/* function. */
# pragma intrinsic (_InterlockedCompareExchange64)
/* Returns nonzero if the comparison succeeded. */
AO_INLINE int
AO_double_compare_and_swap_full(volatile AO_double_t *addr,
AO_double_t old_val, AO_double_t new_val)
{
return (double_ptr_storage)_InterlockedCompareExchange64(
(__int64 volatile *)addr,
new_val.AO_whole /* exchange */,
old_val.AO_whole) == old_val.AO_whole;
}
# define AO_HAVE_double_compare_and_swap_full
#endif /* AO_ASSUME_VISTA */
#define AO_T_IS_INT
/* Real X86 implementations, except for some old WinChips, appear */
/* to enforce ordering between memory operations, EXCEPT that a later */
/* read can pass earlier writes, presumably due to the visible */
/* presence of store buffers. */
/* We ignore both the WinChips, and the fact that the official specs */
/* seem to be much weaker (and arguably too weak to be usable). */
#include "../ordered_except_wr.h"
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