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ntdll: Implement NtFlushInstructionCache using __clear_cache where available. 

The configure check needs to be done with a more elaborate test than
just AC_CHECK_FUNC, since it's a built-in function in clang and errors
out if invoked with no parameters.

Signed-off-by: Martin Storsjo <martin@martin.st>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Martin Storsjo 2018-01-22 00:05:09 +02:00 committed by Alexandre Julliard
parent 6aa853ae39
commit 4415653f84
4 changed files with 60 additions and 11 deletions
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33
configure vendored
View File

@ -17759,6 +17759,39 @@ $as_echo "#define HAVE___BUILTIN_POPCOUNT 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __clear_cache" >&5
$as_echo_n "checking for __clear_cache... " >&6; }
if ${ac_cv_have___clear_cache+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
__clear_cache((void*)0, (void*)0); return 0;
;
return 0;
}
_ACEOF
if ac_fn_c_try_link "$LINENO"; then :
ac_cv_have___clear_cache="yes"
else
ac_cv_have___clear_cache="no"
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_have___clear_cache" >&5
$as_echo "$ac_cv_have___clear_cache" >&6; }
if test "$ac_cv_have___clear_cache" = "yes"
then
$as_echo "#define HAVE___CLEAR_CACHE 1" >>confdefs.h
fi
case $host_cpu in
*i[3456789]86*) { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we need to define __i386__" >&5

8
configure.ac
View File

@ -2706,6 +2706,14 @@ then
AC_DEFINE(HAVE___BUILTIN_POPCOUNT, 1, [Define to 1 if you have the `__builtin_popcount' built-in function.])
fi
AC_CACHE_CHECK([for __clear_cache], ac_cv_have___clear_cache,
AC_LINK_IFELSE([AC_LANG_PROGRAM(,[[__clear_cache((void*)0, (void*)0); return 0;]])],
[ac_cv_have___clear_cache="yes"], [ac_cv_have___clear_cache="no"]))
if test "$ac_cv_have___clear_cache" = "yes"
then
AC_DEFINE(HAVE___CLEAR_CACHE, 1, [Define to 1 if you have the `__clear_cache' (potentially built-in) function.])
fi
dnl *** check for the need to define platform-specific symbols
case $host_cpu in

26
dlls/ntdll/process.c
View File

@ -653,20 +653,24 @@ NTSTATUS WINAPI NtSetInformationProcess(
* NtFlushInstructionCache [NTDLL.@]
* ZwFlushInstructionCache [NTDLL.@]
*/
NTSTATUS WINAPI NtFlushInstructionCache(
IN HANDLE ProcessHandle,
IN LPCVOID BaseAddress,
IN SIZE_T Size)
NTSTATUS WINAPI NtFlushInstructionCache( HANDLE handle, const void *addr, SIZE_T size )
{
static int once;
if (!once++)
{
#if defined(__x86_64__) || defined(__i386__)
TRACE("%p %p %ld - no-op on x86 and x86_64\n", ProcessHandle, BaseAddress, Size );
#else
FIXME("%p %p %ld\n", ProcessHandle, BaseAddress, Size );
#endif
/* no-op */
#elif defined(HAVE___CLEAR_CACHE)
if (handle == GetCurrentProcess())
{
__clear_cache( (char *)addr, (char *)addr + size );
}
else
{
static int once;
if (!once++) FIXME( "%p %p %ld other process not supported\n", handle, addr, size );
}
#else
static int once;
if (!once++) FIXME( "%p %p %ld\n", handle, addr, size );
#endif
return STATUS_SUCCESS;
}

4
include/config.h.in
View File

@ -1407,6 +1407,10 @@
/* Define to 1 if you have the `__builtin_popcount' built-in function. */
#undef HAVE___BUILTIN_POPCOUNT
/* Define to 1 if you have the `__clear_cache' (potentially built-in)
function. */
#undef HAVE___CLEAR_CACHE
/* Define to 1 if you have the `__res_getservers' function. */
#undef HAVE___RES_GETSERVERS