[2/4] gdbserver use aarch64_create_target_description

diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index 82c3dc237c3fb6baeb2a72cd9ed66d8c7556d72a..062df1b0e241097b0c9f4e0f5b4b534f42dc4457 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -27,9 +27,11 @@  srv_hostio_err_objs="hostio-errno.o"
 if $development; then
    srv_i386_linux_regobj="i386-linux.o i386-avx-linux.o i386-avx-avx512-linux.o i386-avx-mpx-avx512-pku-linux.o i386-mpx-linux.o i386-avx-mpx-linux.o i386-mmx-linux.o linux-x86-tdesc-selftest.o"
    srv_amd64_linux_regobj="amd64-linux.o amd64-avx-linux.o amd64-avx-avx512-linux.o amd64-avx-mpx-avx512-pku-linux.o amd64-mpx-linux.o amd64-avx-mpx-linux.o x32-linux.o x32-avx-linux.o x32-avx-avx512-linux.o"
+   srv_aarch64_linux_regobj="aarch64.o"
 else
    srv_i386_linux_regobj=""
    srv_amd64_linux_regobj=""
+   srv_aarch64_linux_regobj=""
 fi

 ipa_ppc_linux_regobj="powerpc-32l-ipa.o powerpc-altivec32l-ipa.o powerpc-cell32l-ipa.o powerpc-vsx32l-ipa.o powerpc-isa205-32l-ipa.o powerpc-isa205-altivec32l-ipa.o powerpc-isa205-vsx32l-ipa.o powerpc-e500l-ipa.o powerpc-64l-ipa.o powerpc-altivec64l-ipa.o powerpc-cell64l-ipa.o powerpc-vsx64l-ipa.o powerpc-isa205-64l-ipa.o powerpc-isa205-altivec64l-ipa.o powerpc-isa205-vsx64l-ipa.o"
@@ -50,13 +52,15 @@  srv_linux_obj="linux-low.o linux-osdata.o linux-procfs.o linux-ptrace.o linux-wa

 case "${target}" in
   aarch64*-*-linux*)
-			srv_regobj="aarch64.o"
+			srv_regobj="$srv_aarch64_linux_regobj"
 			srv_regobj="${srv_regobj} arm-with-neon.o"
 			srv_tgtobj="linux-aarch64-low.o aarch64-linux-hw-point.o"
 			srv_tgtobj="$srv_tgtobj linux-aarch32-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/arm.o"
 			srv_tgtobj="$srv_tgtobj aarch64-linux.o"
 			srv_tgtobj="$srv_tgtobj arch/aarch64-insn.o"
+			srv_tgtobj="$srv_tgtobj arch/aarch64.o"
+			srv_tgtobj="$srv_tgtobj linux-aarch64-tdesc.o"
 			srv_tgtobj="${srv_tgtobj} $srv_linux_obj"
 			srv_xmlfiles="aarch64.xml"
 			srv_xmlfiles="${srv_xmlfiles} aarch64-core.xml"
@@ -65,7 +69,9 @@  case "${target}" in
 			srv_xmlfiles="${srv_xmlfiles} arm/arm-with-neon.xml"
 			srv_linux_regsets=yes
 			srv_linux_thread_db=yes
-			ipa_obj="linux-aarch64-ipa.o aarch64-ipa.o"
+			ipa_obj="linux-aarch64-ipa.o"
+			ipa_obj="${ipa_obj} linux-aarch64-tdesc-ipa.o"
+			ipa_obj="${ipa_obj} arch/aarch64-ipa.o"
 			;;
   arm*-*-linux*)	srv_regobj="reg-arm.o arm-with-iwmmxt.o"
 			srv_regobj="${srv_regobj} arm-with-vfpv2.o"
diff --git a/gdb/gdbserver/linux-aarch64-ipa.c b/gdb/gdbserver/linux-aarch64-ipa.c
index ad1059029bb669f4fd6240d8ce8aef126879b6ff..28dc9776a1c8d273e8bc749296a57bc62b8619d5 100644
--- a/gdb/gdbserver/linux-aarch64-ipa.c
+++ b/gdb/gdbserver/linux-aarch64-ipa.c
@@ -25,10 +25,10 @@ 
 #ifdef HAVE_GETAUXVAL
 #include <sys/auxv.h>
 #endif
+#include "linux-aarch64-tdesc.h"

 /* Defined in auto-generated file aarch64.c.  */
 void init_registers_aarch64 (void);
-extern const struct target_desc *tdesc_aarch64;

 /* Each register saved by the jump pad is in a 16 byte cell.  */
 #define FT_CR_SIZE 16
@@ -155,7 +155,7 @@  get_raw_reg (const unsigned char *raw_regs, int regnum)
 const struct target_desc *
 get_ipa_tdesc (int idx)
 {
-  return tdesc_aarch64;
+  return aarch64_linux_read_description ();
 }

 /* Allocate buffer for the jump pads.  The branch instruction has a reach
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index b00d5c502d2be67daf0e7f48025647f191efef3b..dcce287974cb6afd2f530ce1257dbbf25ed25ddc 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -39,10 +39,10 @@ 

 #include "gdb_proc_service.h"
 #include "arch/aarch64.h"
+#include "linux-aarch64-tdesc.h"

 /* Defined in auto-generated files.  */
 void init_registers_aarch64 (void);
-extern const struct target_desc *tdesc_aarch64;

 #ifdef HAVE_SYS_REG_H
 #include <sys/reg.h>
@@ -467,11 +467,10 @@  aarch64_linux_new_fork (struct process_info *parent,
   *child->priv->arch_private = *parent->priv->arch_private;
 }

-/* Return the right target description according to the ELF file of
-   current thread.  */
+/* Implementation of linux_target_ops method "arch_setup".  */

-static const struct target_desc *
-aarch64_linux_read_description (void)
+static void
+aarch64_arch_setup (void)
 {
   unsigned int machine;
   int is_elf64;
@@ -482,17 +481,9 @@  aarch64_linux_read_description (void)
   is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);

   if (is_elf64)
-    return tdesc_aarch64;
+    current_process ()->tdesc = aarch64_linux_read_description ();
   else
-    return tdesc_arm_with_neon;
-}
-
-/* Implementation of linux_target_ops method "arch_setup".  */
-
-static void
-aarch64_arch_setup (void)
-{
-  current_process ()->tdesc = aarch64_linux_read_description ();
+    current_process ()->tdesc = tdesc_arm_with_neon;

   aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread));
 }
diff --git a/gdb/gdbserver/linux-aarch64-tdesc.h b/gdb/gdbserver/linux-aarch64-tdesc.h
new file mode 100644
index 0000000000000000000000000000000000000000..6d6731720c3b4123d16f179acc5087ffd2d9b454
--- /dev/null
+++ b/gdb/gdbserver/linux-aarch64-tdesc.h
@@ -0,0 +1,20 @@ 
+/* Low level support for aarch64, shared between gdbserver and IPA.
+
+   Copyright (C) 2016-2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+const target_desc * aarch64_linux_read_description ();
diff --git a/gdb/gdbserver/linux-aarch64-tdesc.c b/gdb/gdbserver/linux-aarch64-tdesc.c
new file mode 100644
index 0000000000000000000000000000000000000000..8518ef73389ce9d7bd526de75716bd21dbef7959
--- /dev/null
+++ b/gdb/gdbserver/linux-aarch64-tdesc.c
@@ -0,0 +1,37 @@ 
+/* GNU/Linux/aarch64 specific target description, for the remote server
+   for GDB.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program 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 of the License, or
+   (at your option) any later version.
+
+   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "server.h"
+#include "tdesc.h"
+#include "arch/aarch64.h"
+#include "linux-aarch32-low.h"
+
+/* Create the aarch64 target description.  */
+
+const target_desc *
+aarch64_linux_read_description ()
+{
+  static target_desc *aarch64_tdesc = NULL;
+  target_desc **tdesc = &aarch64_tdesc;
+
+  if (*tdesc == NULL)
+    *tdesc = aarch64_create_target_description ();
+
+  return *tdesc;
+}