[aarch64] Refactor common errata work-around specs

diff --git a/gcc/config.gcc b/gcc/config.gcc
index fda048dc12b..33c5ddebc96 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -980,7 +980,7 @@  esac
 case ${target} in
 aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)
 	tm_file="${tm_file} dbxelf.h elfos.h newlib-stdint.h"
-	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-elf-raw.h"
+	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-errata.h aarch64/aarch64-elf-raw.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64"
 	case $target in
 	aarch64-*-elf*)
@@ -1017,19 +1017,19 @@  aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)
 	;;
 aarch64*-*-freebsd*)
 	tm_file="${tm_file} dbxelf.h elfos.h ${fbsd_tm_file}"
-	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-freebsd.h"
+	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-errata.h aarch64/aarch64-freebsd.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-freebsd"
 	tm_defines="${tm_defines}  TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
 	;;
 aarch64*-*-netbsd*)
 	tm_file="${tm_file} dbxelf.h elfos.h ${nbsd_tm_file}"
-	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-netbsd.h"
+	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-errata.h aarch64/aarch64-netbsd.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-netbsd"
 	extra_options="${extra_options} netbsd.opt netbsd-elf.opt"
 	;;
 aarch64*-*-linux*)
 	tm_file="${tm_file} dbxelf.h elfos.h gnu-user.h linux.h glibc-stdint.h"
-	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-linux.h"
+	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-errata.h aarch64/aarch64-linux.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-linux"
 	tm_defines="${tm_defines}  TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
 	case $target in
diff --git a/gcc/config/aarch64/aarch64-elf-raw.h b/gcc/config/aarch64/aarch64-elf-raw.h
index bbebd0ef029..8fe7b378360 100644
--- a/gcc/config/aarch64/aarch64-elf-raw.h
+++ b/gcc/config/aarch64/aarch64-elf-raw.h
@@ -27,22 +27,6 @@ 
   " crtend%O%s crtn%O%s " \
   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
 
-#if TARGET_FIX_ERR_A53_835769_DEFAULT
-#define CA53_ERR_835769_SPEC \
-  " %{!mno-fix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#else
-#define CA53_ERR_835769_SPEC \
-  " %{mfix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#endif
-
-#if TARGET_FIX_ERR_A53_843419_DEFAULT
-#define CA53_ERR_843419_SPEC \
-  " %{!mno-fix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#else
-#define CA53_ERR_843419_SPEC \
-  " %{mfix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#endif
-
 #ifndef LINK_SPEC
 #define LINK_SPEC "%{h*}			\
    %{static:-Bstatic}				\
@@ -51,8 +35,7 @@ 
    %{!static:%{rdynamic:-export-dynamic}}	\
    %{mbig-endian:-EB} %{mlittle-endian:-EL} -X	\
   -maarch64elf%{mabi=ilp32*:32}%{mbig-endian:b}" \
-  CA53_ERR_835769_SPEC \
-  CA53_ERR_843419_SPEC
+  AARCH64_ERRATA_LINK_SPEC
 #endif
 
 #endif /* GCC_AARCH64_ELF_RAW_H */
diff --git a/gcc/config/aarch64/aarch64-errata.h b/gcc/config/aarch64/aarch64-errata.h
new file mode 100644
index 00000000000..8f062536e8b
--- /dev/null
+++ b/gcc/config/aarch64/aarch64-errata.h
@@ -0,0 +1,44 @@ 
+/* Machine description for AArch64 architecture.
+   Copyright (C) 2009-2019 Free Software Foundation, Inc.
+   Contributed by ARM Ltd.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_AARCH64_ERRATA_H
+#define GCC_AARCH64_ERRATA_H
+
+#if TARGET_FIX_ERR_A53_835769_DEFAULT
+#define CA53_ERR_835769_SPEC \
+  " %{!mno-fix-cortex-a53-835769:--fix-cortex-a53-835769}"
+#else
+#define CA53_ERR_835769_SPEC \
+  " %{mfix-cortex-a53-835769:--fix-cortex-a53-835769}"
+#endif
+
+#if TARGET_FIX_ERR_A53_843419_DEFAULT
+#define CA53_ERR_843419_SPEC \
+  " %{!mno-fix-cortex-a53-843419:--fix-cortex-a53-843419}"
+#else
+#define CA53_ERR_843419_SPEC \
+  " %{mfix-cortex-a53-843419:--fix-cortex-a53-843419}"
+#endif
+
+#define AARCH64_ERRATA_LINK_SPEC		\
+  CA53_ERR_835769_SPEC				\
+  CA53_ERR_843419_SPEC
+
+#endif /*  GCC_AARCH64_ERRATA_H */
diff --git a/gcc/config/aarch64/aarch64-freebsd.h b/gcc/config/aarch64/aarch64-freebsd.h
index 899e6f95e34..7a3e89b1b0e 100644
--- a/gcc/config/aarch64/aarch64-freebsd.h
+++ b/gcc/config/aarch64/aarch64-freebsd.h
@@ -46,26 +46,8 @@ 
     -X" SUBTARGET_EXTRA_LINK_SPEC "                             \
     %{mbig-endian:-EB} %{mlittle-endian:-EL}"
 
-#if TARGET_FIX_ERR_A53_835769_DEFAULT
-#define CA53_ERR_835769_SPEC \
-  " %{!mno-fix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#else
-#define CA53_ERR_835769_SPEC \
-  " %{mfix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#endif
-
-#ifdef TARGET_FIX_ERR_A53_843419_DEFAULT
-#define CA53_ERR_843419_SPEC \
-  " %{!mno-fix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#else
-#define CA53_ERR_843419_SPEC \
-  " %{mfix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#endif
-
 #undef  LINK_SPEC
-#define LINK_SPEC FBSD_TARGET_LINK_SPEC	\
-                  CA53_ERR_835769_SPEC	\
-                  CA53_ERR_843419_SPEC
+#define LINK_SPEC FBSD_TARGET_LINK_SPEC AARCH64_ERRATA_LINK_SPEC
 
 #define GNU_USER_TARGET_MATHFILE_SPEC \
   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
diff --git a/gcc/config/aarch64/aarch64-linux.h b/gcc/config/aarch64/aarch64-linux.h
index 5e8b34ded03..6ff2163b633 100644
--- a/gcc/config/aarch64/aarch64-linux.h
+++ b/gcc/config/aarch64/aarch64-linux.h
@@ -46,25 +46,8 @@ 
    %{mbig-endian:-EB} %{mlittle-endian:-EL}     \
    -maarch64linux%{mabi=ilp32:32}%{mbig-endian:b}"
 
-#if TARGET_FIX_ERR_A53_835769_DEFAULT
-#define CA53_ERR_835769_SPEC \
-  " %{!mno-fix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#else
-#define CA53_ERR_835769_SPEC \
-  " %{mfix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#endif
-
-#if TARGET_FIX_ERR_A53_843419_DEFAULT
-#define CA53_ERR_843419_SPEC \
-  " %{!mno-fix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#else
-#define CA53_ERR_843419_SPEC \
-  " %{mfix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#endif
-
-#define LINK_SPEC LINUX_TARGET_LINK_SPEC \
-                  CA53_ERR_835769_SPEC \
-                  CA53_ERR_843419_SPEC
+
+#define LINK_SPEC LINUX_TARGET_LINK_SPEC AARCH64_ERRATA_LINK_SPEC
 
 #define GNU_USER_TARGET_MATHFILE_SPEC \
   "%{Ofast|ffast-math|funsafe-math-optimizations:crtfastmath.o%s}"
diff --git a/gcc/config/aarch64/aarch64-netbsd.h b/gcc/config/aarch64/aarch64-netbsd.h
index 2686a1b7ae7..e6c9264bd4a 100644
--- a/gcc/config/aarch64/aarch64-netbsd.h
+++ b/gcc/config/aarch64/aarch64-netbsd.h
@@ -39,27 +39,10 @@ 
   "%{mlittle-endian:-EL -m " TARGET_LINKER_LITTLE_EMULATION "} "	\
   "%(netbsd_link_spec)"
 
-#if TARGET_FIX_ERR_A53_835769_DEFAULT
-#define CA53_ERR_835769_SPEC \
-  " %{!mno-fix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#else
-#define CA53_ERR_835769_SPEC \
-  " %{mfix-cortex-a53-835769:--fix-cortex-a53-835769}"
-#endif
-
-#ifdef TARGET_FIX_ERR_A53_843419_DEFAULT
-#define CA53_ERR_843419_SPEC \
-  " %{!mno-fix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#else
-#define CA53_ERR_843419_SPEC \
-  " %{mfix-cortex-a53-843419:--fix-cortex-a53-843419}"
-#endif
-
 #undef  LINK_SPEC
 #define LINK_SPEC NETBSD_LINK_SPEC_ELF		\
 		  NETBSD_TARGET_LINK_SPEC	\
-		  CA53_ERR_835769_SPEC		\
-		  CA53_ERR_843419_SPEC
+		  AARCH64_ERRATA_LINK_SPEC
 
 #undef TARGET_OS_CPP_BUILTINS
 #define TARGET_OS_CPP_BUILTINS()		\