diff --git a/.hgtags b/.hgtags
index fe970fe87404a04c73846b13127b4fe71d403a27..a0adc815306588e7712dfab5f222a6689f8bd09e 100644
--- a/.hgtags
+++ b/.hgtags
@@ -988,3 +988,5 @@ bb4532c15611d35d3136eeb287049da79ce01ebb jdk8u242-b05
 8ca5f59e3042b7353b64c131be6bb970ba489ce9 jdk8u242-b07
 5b17d1f49219624f122ea2b05ec1c9f1adff8c64 jdk8u242-b08
 5b17d1f49219624f122ea2b05ec1c9f1adff8c64 jdk8u242-ga
+30768a181ad0f4ba3d37f00bf23d76c875cb043a jdk8u252-b00
+5f55e79422a0246076db7d3f2a2c44cb36e0e271 jdk8u252-b01
diff --git a/common/autoconf/flags.m4 b/common/autoconf/flags.m4
index 09b79bbb08e0f6d8873ac878d2ed781bb66804c2..fe0d9a436d0ff7608b207e99a31c2da04f972a43 100644
--- a/common/autoconf/flags.m4
+++ b/common/autoconf/flags.m4
@@ -414,6 +414,11 @@ AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_JDK],
     AC_MSG_WARN([Ignoring LDFLAGS($LDFLAGS) found in environment. Use --with-extra-ldflags])
   fi
 
+
+  if test "x$ASFLAGS" != "x"; then
+    AC_MSG_WARN([Ignoring ASFLAGS($ASFLAGS) found in environment. Use --with-extra-asflags])
+  fi
+
   AC_ARG_WITH(extra-cflags, [AS_HELP_STRING([--with-extra-cflags],
       [extra flags to be used when compiling jdk c-files])])
 
@@ -423,6 +428,9 @@ AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_JDK],
   AC_ARG_WITH(extra-ldflags, [AS_HELP_STRING([--with-extra-ldflags],
       [extra flags to be used when linking jdk])])
 
+  AC_ARG_WITH(extra-asflags, [AS_HELP_STRING([--with-extra-asflags],
+      [extra flags to be passed to the assembler])])
+
   CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
   CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
   LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"
@@ -431,10 +439,12 @@ AC_DEFUN_ONCE([FLAGS_SETUP_COMPILER_FLAGS_FOR_JDK],
   LEGACY_EXTRA_CFLAGS="$LEGACY_EXTRA_CFLAGS $with_extra_cflags"
   LEGACY_EXTRA_CXXFLAGS="$LEGACY_EXTRA_CXXFLAGS $with_extra_cxxflags"
   LEGACY_EXTRA_LDFLAGS="$LEGACY_EXTRA_LDFLAGS $with_extra_ldflags"
+  LEGACY_EXTRA_ASFLAGS="$with_extra_asflags"
 
   AC_SUBST(LEGACY_EXTRA_CFLAGS)
   AC_SUBST(LEGACY_EXTRA_CXXFLAGS)
   AC_SUBST(LEGACY_EXTRA_LDFLAGS)
+  AC_SUBST(LEGACY_EXTRA_ASFLAGS)
 
   ###############################################################################
   #
diff --git a/common/autoconf/generated-configure.sh b/common/autoconf/generated-configure.sh
index 0903e2a4d0c25f1c92f6f491ed5209d38ce37787..5093e3b517bd6ddd2545dd0b9395019527f5f647 100644
--- a/common/autoconf/generated-configure.sh
+++ b/common/autoconf/generated-configure.sh
@@ -689,6 +689,7 @@ MACOSX_VERSION_MIN
 FDLIBM_CFLAGS
 NO_LIFETIME_DSE_CFLAG
 NO_DELETE_NULL_POINTER_CHECKS_CFLAG
+LEGACY_EXTRA_ASFLAGS
 LEGACY_EXTRA_LDFLAGS
 LEGACY_EXTRA_CXXFLAGS
 LEGACY_EXTRA_CFLAGS
@@ -1085,6 +1086,7 @@ with_jtreg
 with_extra_cflags
 with_extra_cxxflags
 with_extra_ldflags
+with_extra_asflags
 enable_debug_symbols
 enable_zip_debug_info
 with_native_debug_symbols
@@ -1947,6 +1949,7 @@ Optional Packages:
   --with-extra-cflags     extra flags to be used when compiling jdk c-files
   --with-extra-cxxflags   extra flags to be used when compiling jdk c++-files
   --with-extra-ldflags    extra flags to be used when linking jdk
+  --with-extra-asflags    extra flags to be passed to the assembler
   --with-native-debug-symbols
                           set the native debug symbol configuration (none,
                           internal, external, zipped) [varying]
@@ -4376,7 +4379,7 @@ VS_SDK_PLATFORM_NAME_2017=
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1565358475
+DATE_WHEN_GENERATED=1579517558
 
 ###############################################################################
 #
@@ -41499,6 +41502,12 @@ $as_echo "$as_me: WARNING: Ignoring LDFLAGS($LDFLAGS) found in environment. Use
   fi
 
 
+  if test "x$ASFLAGS" != "x"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Ignoring ASFLAGS($ASFLAGS) found in environment. Use --with-extra-asflags" >&5
+$as_echo "$as_me: WARNING: Ignoring ASFLAGS($ASFLAGS) found in environment. Use --with-extra-asflags" >&2;}
+  fi
+
+
 # Check whether --with-extra-cflags was given.
 if test "${with_extra_cflags+set}" = set; then :
   withval=$with_extra_cflags;
@@ -41519,6 +41528,13 @@ if test "${with_extra_ldflags+set}" = set; then :
 fi
 
 
+
+# Check whether --with-extra-asflags was given.
+if test "${with_extra_asflags+set}" = set; then :
+  withval=$with_extra_asflags;
+fi
+
+
   CFLAGS_JDK="${CFLAGS_JDK} $with_extra_cflags"
   CXXFLAGS_JDK="${CXXFLAGS_JDK} $with_extra_cxxflags"
   LDFLAGS_JDK="${LDFLAGS_JDK} $with_extra_ldflags"
@@ -41527,6 +41543,8 @@ fi
   LEGACY_EXTRA_CFLAGS="$LEGACY_EXTRA_CFLAGS $with_extra_cflags"
   LEGACY_EXTRA_CXXFLAGS="$LEGACY_EXTRA_CXXFLAGS $with_extra_cxxflags"
   LEGACY_EXTRA_LDFLAGS="$LEGACY_EXTRA_LDFLAGS $with_extra_ldflags"
+  LEGACY_EXTRA_ASFLAGS="$with_extra_asflags"
+
 
 
 
@@ -51600,7 +51618,7 @@ fi
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for UCRT DLL dir" >&5
 $as_echo_n "checking for UCRT DLL dir... " >&6; }
     if test "x$with_ucrt_dll_dir" != x; then
-      if test -z "$(ls -d "$with_ucrt_dll_dir/*.dll" 2> /dev/null)"; then
+      if test -z "$(ls -d "$with_ucrt_dll_dir/"*.dll 2> /dev/null)"; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
         as_fn_error $? "Could not find any dlls in $with_ucrt_dll_dir" "$LINENO" 5
diff --git a/common/autoconf/hotspot-spec.gmk.in b/common/autoconf/hotspot-spec.gmk.in
index 850133efc001909cac1c42979e634f2273d3b891..f7d3fce6f5fd8c09a324cd9149b4b8857c90ff36 100644
--- a/common/autoconf/hotspot-spec.gmk.in
+++ b/common/autoconf/hotspot-spec.gmk.in
@@ -115,6 +115,7 @@ EXTRA_CFLAGS=@LEGACY_EXTRA_CFLAGS@ $(NO_DELETE_NULL_POINTER_CHECKS_CFLAG) \
 				   $(NO_LIFETIME_DSE_CFLAG) $(CXXSTD_CXXFLAG)
 EXTRA_CXXFLAGS=@LEGACY_EXTRA_CXXFLAGS@
 EXTRA_LDFLAGS=@LEGACY_EXTRA_LDFLAGS@
+EXTRA_ASFLAGS=@LEGACY_EXTRA_ASFLAGS@
 
 USE_PRECOMPILED_HEADER=@USE_PRECOMPILED_HEADER@
 
diff --git a/common/autoconf/toolchain_windows.m4 b/common/autoconf/toolchain_windows.m4
index d82030cd3ded863957c5e7c28520b42be970d9e9..a78f9ac6628dcac81550d9255bcba69260dd8611 100644
--- a/common/autoconf/toolchain_windows.m4
+++ b/common/autoconf/toolchain_windows.m4
@@ -652,7 +652,7 @@ AC_DEFUN([TOOLCHAIN_SETUP_VS_RUNTIME_DLLS],
   if test "x$USE_UCRT" = "xtrue"; then
     AC_MSG_CHECKING([for UCRT DLL dir])
     if test "x$with_ucrt_dll_dir" != x; then
-      if test -z "$(ls -d "$with_ucrt_dll_dir/*.dll" 2> /dev/null)"; then
+      if test -z "$(ls -d "$with_ucrt_dll_dir/"*.dll 2> /dev/null)"; then
         AC_MSG_RESULT([no])
         AC_MSG_ERROR([Could not find any dlls in $with_ucrt_dll_dir])
       else