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, 0 insertions, 141 deletions

diff --git a/gdb/gdbserver/regcache.h b/gdb/gdbserver/regcache.h
deleted file mode 100644
index 8725707..0000000
--- a/gdb/gdbserver/regcache.h
+++ /dev/null
@@ -1,141 +0,0 @@
-/* Register support routines for the remote server for GDB.
-   Copyright (C) 2001-2020 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_REGCACHE_H
-#define GDBSERVER_REGCACHE_H
-
-#include "gdbsupport/common-regcache.h"
-
-struct thread_info;
-struct target_desc;
-
-/* The data for the register cache.  Note that we have one per
-   inferior; this is primarily for simplicity, as the performance
-   benefit is minimal.  */
-
-struct regcache : public reg_buffer_common
-{
-  /* The regcache's target description.  */
-  const struct target_desc *tdesc = nullptr;
-
-  /* Whether the REGISTERS buffer's contents are valid.  If false, we
-     haven't fetched the registers from the target yet.  Not that this
-     register cache is _not_ pass-through, unlike GDB's.  Note that
-     "valid" here is unrelated to whether the registers are available
-     in a traceframe.  For that, check REGISTER_STATUS below.  */
-  int registers_valid = 0;
-  int registers_owned = 0;
-  unsigned char *registers = nullptr;
-#ifndef IN_PROCESS_AGENT
-  /* One of REG_UNAVAILABLE or REG_VALID.  */
-  unsigned char *register_status = nullptr;
-#endif
-
-  /* See gdbsupport/common-regcache.h.  */
-  enum register_status get_register_status (int regnum) const override;
-
-  /* See gdbsupport/common-regcache.h.  */
-  void raw_supply (int regnum, const void *buf) override;
-
-  /* See gdbsupport/common-regcache.h.  */
-  void raw_collect (int regnum, void *buf) const override;
-
-  /* See gdbsupport/common-regcache.h.  */
-  bool raw_compare (int regnum, const void *buf, int offset) const override;
-};
-
-struct regcache *init_register_cache (struct regcache *regcache,
-				      const struct target_desc *tdesc,
-				      unsigned char *regbuf);
-
-void regcache_cpy (struct regcache *dst, struct regcache *src);
-
-/* Create a new register cache for INFERIOR.  */
-
-struct regcache *new_register_cache (const struct target_desc *tdesc);
-
-struct regcache *get_thread_regcache (struct thread_info *thread, int fetch);
-
-/* Release all memory associated with the register cache for INFERIOR.  */
-
-void free_register_cache (struct regcache *regcache);
-
-/* Invalidate cached registers for one thread.  */
-
-void regcache_invalidate_thread (struct thread_info *);
-
-/* Invalidate cached registers for all threads of the given process.  */
-
-void regcache_invalidate_pid (int pid);
-
-/* Invalidate cached registers for all threads of the current
-   process.  */
-
-void regcache_invalidate (void);
-
-/* Invalidate and release the register cache of all threads of the
-   current process.  */
-
-void regcache_release (void);
-
-/* Convert all registers to a string in the currently specified remote
-   format.  */
-
-void registers_to_string (struct regcache *regcache, char *buf);
-
-/* Convert a string to register values and fill our register cache.  */
-
-void registers_from_string (struct regcache *regcache, char *buf);
-
-/* For regcache_read_pc see gdbsupport/common-regcache.h.  */
-
-void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
-
-int register_cache_size (const struct target_desc *tdesc);
-
-int register_size (const struct target_desc *tdesc, int n);
-
-int find_regno (const struct target_desc *tdesc, const char *name);
-
-void supply_register (struct regcache *regcache, int n, const void *buf);
-
-void supply_register_zeroed (struct regcache *regcache, int n);
-
-void supply_register_by_name (struct regcache *regcache,
-			      const char *name, const void *buf);
-
-void supply_register_by_name_zeroed (struct regcache *regcache,
-				     const char *name);
-
-void supply_regblock (struct regcache *regcache, const void *buf);
-
-void collect_register (struct regcache *regcache, int n, void *buf);
-
-void collect_register_as_string (struct regcache *regcache, int n, char *buf);
-
-void collect_register_by_name (struct regcache *regcache,
-			       const char *name, void *buf);
-
-/* Read a raw register as an unsigned integer.  Convenience wrapper
-   around regcache_raw_get_unsigned that takes a register name instead
-   of a register number.  */
-
-ULONGEST regcache_raw_get_unsigned_by_name (struct regcache *regcache,
-					    const char *name);
-
-#endif /* GDBSERVER_REGCACHE_H */