Share i386-linux target description between GDB and GDBserver

The code on creating i386-linux target descriptions are quite similar
between GDB and GDBserver, so this patch moves them into a shared file
arch/i386.c.  I didn't name it as i386-linux.c, because I want to reuse it
to create other i386 non-linux target descriptions later.

gdb:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (ALL_TARGET_OBS): Add i386.o.
	(SFILES): Add arch/i386.c.
	(HFILES_NO_SRCDIR): Add arch/i386.h.
	* arch/i386.c: New file.
	* arch/i386.h: New file.
	* arch/tdesc.h (allocate_target_description): Declare.
	(set_tdesc_architecture): Declare.
	(set_tdesc_osabi): Declare.
	* configure.tgt (i[34567]86-*-linux*): Add i386.o.
	* i386-linux-tdep.c: Don't include ../features/i386/32bit-XXX.c.
	include arch/i386.h.
	(i386_linux_read_description): Remove code and call
	i386_create_target_description.
	(set_tdesc_architecture): New function.
	(set_tdesc_osabi): New function.
	* target-descriptions.h (allocate_target_description): Remove.

gdb/gdbserver:

2017-09-05  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (arch-i386.o): New rule.
	* configure.srv (i[34567]86-*-linux*): Add arch-i386.o.
	(x86_64-*-linux*): Likewise.
	* linux-x86-tdesc.c: Don't include ../features/i386/32bit-XXX.c,
	include arch/i386.h.
	(i386_linux_read_description): Remove code and call
	i386_create_target_description.
	* tdesc.c (allocate_target_description): New function.
	* tdesc.h (set_tdesc_architecture): Remove declaration.
	(set_tdesc_osabi): Likewise.

3 files changed, 97 insertions, 0 deletions

diff --git a/gdb/arch/i386.c b/gdb/arch/i386.c
new file mode 100644
index 0000000..60cf63b
--- /dev/null
+++ b/gdb/arch/i386.c
@@ -0,0 +1,66 @@
+/* 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 "i386.h"
+#include "tdesc.h"
+#include "x86-xstate.h"
+#include <stdlib.h>
+
+#include "../features/i386/32bit-core.c"
+#include "../features/i386/32bit-linux.c"
+#include "../features/i386/32bit-sse.c"
+#include "../features/i386/32bit-avx.c"
+#include "../features/i386/32bit-avx512.c"
+#include "../features/i386/32bit-mpx.c"
+#include "../features/i386/32bit-pkeys.c"
+
+/* Create i386 target descriptions according to XCR0.  */
+
+target_desc *
+i386_create_target_description (uint64_t xcr0)
+{
+  target_desc *tdesc = allocate_target_description ();
+
+#ifndef IN_PROCESS_AGENT
+  set_tdesc_architecture (tdesc, "i386");
+  set_tdesc_osabi (tdesc, "GNU/Linux");
+#endif
+
+  long regnum = 0;
+
+  if (xcr0 & X86_XSTATE_X87)
+    regnum = create_feature_i386_32bit_core (tdesc, regnum);
+
+  if (xcr0 & X86_XSTATE_SSE)
+    regnum = create_feature_i386_32bit_sse (tdesc, regnum);
+
+  regnum = create_feature_i386_32bit_linux (tdesc, regnum);
+
+  if (xcr0 & X86_XSTATE_AVX)
+    regnum = create_feature_i386_32bit_avx (tdesc, regnum);
+
+  if (xcr0 & X86_XSTATE_MPX)
+    regnum = create_feature_i386_32bit_mpx (tdesc, regnum);
+
+  if (xcr0 & X86_XSTATE_AVX512)
+    regnum = create_feature_i386_32bit_avx512 (tdesc, regnum);
+
+  if (xcr0 & X86_XSTATE_PKRU)
+    regnum = create_feature_i386_32bit_pkeys (tdesc, regnum);
+
+  return tdesc;
+}
diff --git a/gdb/arch/i386.h b/gdb/arch/i386.h
new file mode 100644
index 0000000..0163372
--- /dev/null
+++ b/gdb/arch/i386.h
@@ -0,0 +1,21 @@
+/* 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 "tdesc.h"
+#include <stdint.h>
+
+target_desc *i386_create_target_description (uint64_t xcr0);
diff --git a/gdb/arch/tdesc.h b/gdb/arch/tdesc.h
index bf50e24..78bb0fb 100644
--- a/gdb/arch/tdesc.h
+++ b/gdb/arch/tdesc.h
@@ -23,6 +23,16 @@ struct tdesc_type;
 struct tdesc_reg;
 struct target_desc;
 
+/* Allocate a new target_desc.  */
+target_desc *allocate_target_description (void);
+
+/* Set TARGET_DESC's architecture by NAME.  */
+void set_tdesc_architecture (target_desc *target_desc,
+			     const char *name);
+
+/* Set TARGET_DESC's osabi by NAME.  */
+void set_tdesc_osabi (target_desc *target_desc, const char *name);
+
 /* Return the type associated with ID in the context of FEATURE, or
    NULL if none.  */
 struct tdesc_type *tdesc_named_type (const struct tdesc_feature *feature,