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, 132 deletions

diff --git a/gdb/gdbserver/linux-cris-low.c b/gdb/gdbserver/linux-cris-low.c
deleted file mode 100644
index 8ea5af9..0000000
--- a/gdb/gdbserver/linux-cris-low.c
+++ /dev/null
@@ -1,132 +0,0 @@
-/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
-   Copyright (C) 1995-2020 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/>.  */
-
-#include "server.h"
-#include "linux-low.h"
-#include "nat/gdb_ptrace.h"
-
-/* Defined in auto-generated file reg-cris.c.  */
-void init_registers_cris (void);
-extern const struct target_desc *tdesc_cris;
-
-/* CRISv10 */
-#define cris_num_regs 32
-
-/* Locations need to match <include/asm/arch/ptrace.h>.  */
-static int cris_regmap[] = {
-  15*4, 14*4, 13*4, 12*4,
-  11*4, 10*4, 9*4, 8*4,
-  7*4, 6*4, 5*4, 4*4,
-  3*4, 2*4, 23*4, 19*4,
-
-  -1, -1, -1, -1,
-  -1, 17*4, -1, 16*4,
-  -1, -1, -1, 18*4,
-  -1, 17*4, -1, -1
-
-};
-
-static int
-cris_cannot_store_register (int regno)
-{
-  if (cris_regmap[regno] == -1)
-    return 1;
-
-  return (regno >= cris_num_regs);
-}
-
-static int
-cris_cannot_fetch_register (int regno)
-{
-  if (cris_regmap[regno] == -1)
-    return 1;
-
-  return (regno >= cris_num_regs);
-}
-
-static const unsigned short cris_breakpoint = 0xe938;
-#define cris_breakpoint_len 2
-
-/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
-
-static const gdb_byte *
-cris_sw_breakpoint_from_kind (int kind, int *size)
-{
-  *size = cris_breakpoint_len;
-  return (const gdb_byte *) &cris_breakpoint;
-}
-
-static int
-cris_breakpoint_at (CORE_ADDR where)
-{
-  unsigned short insn;
-
-  (*the_target->read_memory) (where, (unsigned char *) &insn,
-			      cris_breakpoint_len);
-  if (insn == cris_breakpoint)
-    return 1;
-
-  /* If necessary, recognize more trap instructions here.  GDB only uses the
-     one.  */
-  return 0;
-}
-
-static void
-cris_arch_setup (void)
-{
-  current_process ()->tdesc = tdesc_cris;
-}
-
-static struct usrregs_info cris_usrregs_info =
-  {
-    cris_num_regs,
-    cris_regmap,
-  };
-
-static struct regs_info regs_info =
-  {
-    NULL, /* regset_bitmap */
-    &cris_usrregs_info,
-  };
-
-static const struct regs_info *
-cris_regs_info (void)
-{
-  return &regs_info;
-}
-
-struct linux_target_ops the_low_target = {
-  cris_arch_setup,
-  cris_regs_info,
-  cris_cannot_fetch_register,
-  cris_cannot_store_register,
-  NULL, /* fetch_register */
-  linux_get_pc_32bit,
-  linux_set_pc_32bit,
-  NULL, /* breakpoint_kind_from_pc */
-  cris_sw_breakpoint_from_kind,
-  NULL, /* get_next_pcs */
-  0,
-  cris_breakpoint_at,
-};
-
-void
-initialize_low_arch (void)
-{
-  init_registers_cris ();
-}