Move gdbserver to top level

This patch moves gdbserver to the top level.

This patch is as close to a pure move as possible -- gdbserver still
builds its own variant of gnulib and gdbsupport.  Changing this will
be done in a separate patch.

[v2] Note that, per Simon's review comment, this patch changes the
tree so that gdbserver is not built for or1k or score.  This makes
sense, because there is apparently not actually a gdbserver port here.

[v3] This version of the patch also splits out some configury into a
new file, gdbserver/configure.host, so that the top-level configure
script can simply rely on it in order to decide whether gdbserver
should be built.

[v4] This version adds documentation and removes some unnecessary
top-level dependencies.

[v5] Update docs to mention "make all-gdbserver" and change how
top-level configure decides whether to build gdbserver, switching to a
single, shared script.

Tested by the buildbot.

ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>
	    Pedro Alves  <palves@redhat.com>

	* src-release.sh (GDB_SUPPORT_DIRS): Add gdbserver.
	* gdbserver: New directory, moved from gdb/gdbserver.
	* configure.ac (host_tools): Add gdbserver.
	Only build gdbserver on certain systems.
	* Makefile.in, configure: Rebuild.
	* Makefile.def (host_modules, dependencies): Add gdbserver.
	* MAINTAINERS: Add gdbserver.

gdb/ChangeLog
2020-02-07  Tom Tromey  <tom@tromey.com>

	* README: Update gdbserver documentation.
	* gdbserver: Move to top level.
	* configure.tgt (build_gdbserver): Remove.
	* configure.ac: Remove --enable-gdbserver.
	* configure: Rebuild.
	* Makefile.in (distclean): Don't mention gdbserver.

Change-Id: I826b7565b54604711dc7a11edea0499cd51ff39e

1 files changed, 59 insertions, 0 deletions

diff --git a/gdbserver/lynx-low.h b/gdbserver/lynx-low.h
new file mode 100644
index 0000000..b122298
--- /dev/null
+++ b/gdbserver/lynx-low.h
@@ -0,0 +1,59 @@
+/* Copyright (C) 2010-2020 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/>.  */
+
+#ifndef GDBSERVER_LYNX_LOW_H
+#define GDBSERVER_LYNX_LOW_H
+
+struct regcache;
+struct target_desc;
+
+/*  Some information relative to a given register set.   */
+
+struct lynx_regset_info
+{
+  /* The ptrace request needed to get/set registers of this set.  */
+  int get_request, set_request;
+  /* The size of the register set.  */
+  int size;
+  /* Fill the buffer BUF from the contents of the given REGCACHE.  */
+  void (*fill_function) (struct regcache *regcache, char *buf);
+  /* Store the register value in BUF in the given REGCACHE.  */
+  void (*store_function) (struct regcache *regcache, const char *buf);
+};
+
+/* A list of regsets for the target being debugged, terminated by an entry
+   where the size is negative.
+
+   This list should be created by the target-specific code.  */
+
+extern struct lynx_regset_info lynx_target_regsets[];
+
+/* The target-specific operations for LynxOS support.  */
+
+struct lynx_target_ops
+{
+  /* Architecture-specific setup.  */
+  void (*arch_setup) (void);
+};
+
+extern struct lynx_target_ops the_low_target;
+
+/* The inferior's target description.  This is a global because the
+   LynxOS ports support neither bi-arch nor multi-process.  */
+extern const struct target_desc *lynx_tdesc;
+
+#endif /* GDBSERVER_LYNX_LOW_H */