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, 222 deletions

diff --git a/gdb/gdbserver/linux-tile-low.c b/gdb/gdbserver/linux-tile-low.c
deleted file mode 100644
index cd85e94..0000000
--- a/gdb/gdbserver/linux-tile-low.c
+++ /dev/null
@@ -1,222 +0,0 @@
-/* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
-
-   Copyright (C) 2012-2020 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 <arch/abi.h>
-#include "nat/gdb_ptrace.h"
-
-/* Defined in auto-generated file reg-tilegx.c.  */
-void init_registers_tilegx (void);
-extern const struct target_desc *tdesc_tilegx;
-
-/* Defined in auto-generated file reg-tilegx32.c.  */
-void init_registers_tilegx32 (void);
-extern const struct target_desc *tdesc_tilegx32;
-
-#define tile_num_regs 65
-
-static int tile_regmap[] =
-{
-   0,  1,  2,  3,  4,  5,  6,  7,
-   8,  9, 10, 11, 12, 13, 14, 15,
-  16, 17, 18, 19, 20, 21, 22, 23,
-  24, 25, 26, 27, 28, 29, 30, 31,
-  32, 33, 34, 35, 36, 37, 38, 39,
-  40, 41, 42, 43, 44, 45, 46, 47,
-  48, 49, 50, 51, 52, 53, 54, 55,
-  -1, -1, -1, -1, -1, -1, -1, -1,
-  56
-};
-
-static int
-tile_cannot_fetch_register (int regno)
-{
-  if (regno >= 0 && regno < 56)
-    return 0;
-  else if (regno == 64)
-    return 0;
-  else
-    return 1;
-}
-
-static int
-tile_cannot_store_register (int regno)
-{
-  if (regno >= 0 && regno < 56)
-    return 0;
-  else if (regno == 64)
-    return 0;
-  else
-    return 1;
-}
-
-static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
-#define tile_breakpoint_len 8
-
-/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
-
-static const gdb_byte *
-tile_sw_breakpoint_from_kind (int kind, int *size)
-{
-  *size = tile_breakpoint_len;
-  return (const gdb_byte *) &tile_breakpoint;
-}
-
-static int
-tile_breakpoint_at (CORE_ADDR where)
-{
-  uint64_t insn;
-
-  (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
-  if (insn == tile_breakpoint)
-    return 1;
-
-  /* If necessary, recognize more trap instructions here.  GDB only uses the
-     one.  */
-  return 0;
-}
-
-static void
-tile_fill_gregset (struct regcache *regcache, void *buf)
-{
-  int i;
-
-  for (i = 0; i < tile_num_regs; i++)
-    if (tile_regmap[i] != -1)
-      collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
-}
-
-static void
-tile_store_gregset (struct regcache *regcache, const void *buf)
-{
-  int i;
-
-  for (i = 0; i < tile_num_regs; i++)
-    if (tile_regmap[i] != -1)
-      supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
-}
-
-static struct regset_info tile_regsets[] =
-{
-  { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
-    GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
-  NULL_REGSET
-};
-
-static struct regsets_info tile_regsets_info =
-  {
-    tile_regsets, /* regsets */
-    0, /* num_regsets */
-    NULL, /* disabled_regsets */
-  };
-
-static struct usrregs_info tile_usrregs_info =
-  {
-    tile_num_regs,
-    tile_regmap,
-  };
-
-static struct regs_info regs_info =
-  {
-    NULL, /* regset_bitmap */
-    &tile_usrregs_info,
-    &tile_regsets_info,
-  };
-
-static const struct regs_info *
-tile_regs_info (void)
-{
-  return &regs_info;
-}
-
-static void
-tile_arch_setup (void)
-{
-  int pid = pid_of (current_thread);
-  unsigned int machine;
-  int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
-
-  if (sizeof (void *) == 4)
-    if (is_elf64 > 0)
-      error (_("Can't debug 64-bit process with 32-bit GDBserver"));
-
-  if (!is_elf64)
-    current_process ()->tdesc = tdesc_tilegx32;
-  else
-    current_process ()->tdesc = tdesc_tilegx;
-}
-
-/* Support for hardware single step.  */
-
-static int
-tile_supports_hardware_single_step (void)
-{
-  return 1;
-}
-
-
-struct linux_target_ops the_low_target =
-{
-  tile_arch_setup,
-  tile_regs_info,
-  tile_cannot_fetch_register,
-  tile_cannot_store_register,
-  NULL,
-  linux_get_pc_64bit,
-  linux_set_pc_64bit,
-  NULL, /* breakpoint_kind_from_pc */
-  tile_sw_breakpoint_from_kind,
-  NULL,
-  0,
-  tile_breakpoint_at,
-  NULL, /* supports_z_point_type */
-  NULL, /* insert_point */
-  NULL, /* remove_point */
-  NULL, /* stopped_by_watchpoint */
-  NULL, /* stopped_data_address */
-  NULL, /* collect_ptrace_register */
-  NULL, /* supply_ptrace_register */
-  NULL, /* siginfo_fixup */
-  NULL, /* new_process */
-  NULL, /* delete_process */
-  NULL, /* new_thread */
-  NULL, /* delete_thread */
-  NULL, /* new_fork */
-  NULL, /* prepare_to_resume */
-  NULL, /* process_qsupported */
-  NULL, /* supports_tracepoints */
-  NULL, /* get_thread_area */
-  NULL, /* install_fast_tracepoint_jump_pad */
-  NULL, /* emit_ops */
-  NULL, /* get_min_fast_tracepoint_insn_len */
-  NULL, /* supports_range_stepping */
-  NULL, /* breakpoint_kind_from_current_state */
-  tile_supports_hardware_single_step,
-};
-
-void
-initialize_low_arch (void)
-{
-  init_registers_tilegx32();
-  init_registers_tilegx();
-
-  initialize_regsets_info (&tile_regsets_info);
-}