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, 159 deletions

diff --git a/gdb/gdbserver/linux-bfin-low.c b/gdb/gdbserver/linux-bfin-low.c
deleted file mode 100644
index 5bfc8868bd9..00000000000
--- a/gdb/gdbserver/linux-bfin-low.c
+++ /dev/null
@@ -1,159 +0,0 @@
-/* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
-
-   Copyright (C) 2005-2020 Free Software Foundation, Inc.
-
-   Contributed by Analog Devices, 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 <asm/ptrace.h>
-
-/* Defined in auto-generated file reg-bfin.c.  */
-void init_registers_bfin (void);
-extern const struct target_desc *tdesc_bfin;
-
-static int bfin_regmap[] =
-{
-  PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
-  PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
-  PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
-  PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
-  PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
-  PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
-  -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
-  -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
-  PT_PC,
-};
-
-#define bfin_num_regs ARRAY_SIZE (bfin_regmap)
-
-static int
-bfin_cannot_store_register (int regno)
-{
-  return (regno >= bfin_num_regs);
-}
-
-static int
-bfin_cannot_fetch_register (int regno)
-{
-  return (regno >= bfin_num_regs);
-}
-
-#define bfin_breakpoint_len 2
-static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
-
-/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
-
-static const gdb_byte *
-bfin_sw_breakpoint_from_kind (int kind, int *size)
-{
-  *size = bfin_breakpoint_len;
-  return bfin_breakpoint;
-}
-
-static int
-bfin_breakpoint_at (CORE_ADDR where)
-{
-  unsigned char insn[bfin_breakpoint_len];
-
-  read_inferior_memory(where, insn, bfin_breakpoint_len);
-  if (insn[0] == bfin_breakpoint[0]
-      && insn[1] == bfin_breakpoint[1])
-    return 1;
-
-  /* If necessary, recognize more trap instructions here.  GDB only uses the
-     one.  */
-  return 0;
-}
-
-static void
-bfin_arch_setup (void)
-{
-  current_process ()->tdesc = tdesc_bfin;
-}
-
-/* Support for hardware single step.  */
-
-static int
-bfin_supports_hardware_single_step (void)
-{
-  return 1;
-}
-
-static struct usrregs_info bfin_usrregs_info =
-  {
-    bfin_num_regs,
-    bfin_regmap,
-  };
-
-static struct regs_info regs_info =
-  {
-    NULL, /* regset_bitmap */
-    &bfin_usrregs_info,
-  };
-
-static const struct regs_info *
-bfin_regs_info (void)
-{
-  return &regs_info;
-}
-
-struct linux_target_ops the_low_target = {
-  bfin_arch_setup,
-  bfin_regs_info,
-  bfin_cannot_fetch_register,
-  bfin_cannot_store_register,
-  NULL, /* fetch_register */
-  linux_get_pc_32bit,
-  linux_set_pc_32bit,
-  NULL, /* breakpoint_kind_from_pc */
-  bfin_sw_breakpoint_from_kind,
-  NULL, /* get_next_pcs */
-  2,
-  bfin_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 */
-  bfin_supports_hardware_single_step,
-};
-
-
-void
-initialize_low_arch (void)
-{
-  init_registers_bfin ();
-}