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, 528 deletions

diff --git a/gdb/gdbserver/regcache.c b/gdb/gdbserver/regcache.c
deleted file mode 100644
index f634633..0000000
--- a/gdb/gdbserver/regcache.c
+++ /dev/null
@@ -1,528 +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/>.  */
-
-#include "server.h"
-#include "regdef.h"
-#include "gdbthread.h"
-#include "tdesc.h"
-#include "gdbsupport/rsp-low.h"
-#ifndef IN_PROCESS_AGENT
-
-struct regcache *
-get_thread_regcache (struct thread_info *thread, int fetch)
-{
-  struct regcache *regcache;
-
-  regcache = thread_regcache_data (thread);
-
-  /* Threads' regcaches are created lazily, because biarch targets add
-     the main thread/lwp before seeing it stop for the first time, and
-     it is only after the target sees the thread stop for the first
-     time that the target has a chance of determining the process's
-     architecture.  IOW, when we first add the process's main thread
-     we don't know which architecture/tdesc its regcache should
-     have.  */
-  if (regcache == NULL)
-    {
-      struct process_info *proc = get_thread_process (thread);
-
-      gdb_assert (proc->tdesc != NULL);
-
-      regcache = new_register_cache (proc->tdesc);
-      set_thread_regcache_data (thread, regcache);
-    }
-
-  if (fetch && regcache->registers_valid == 0)
-    {
-      struct thread_info *saved_thread = current_thread;
-
-      current_thread = thread;
-      /* Invalidate all registers, to prevent stale left-overs.  */
-      memset (regcache->register_status, REG_UNAVAILABLE,
-	      regcache->tdesc->reg_defs.size ());
-      fetch_inferior_registers (regcache, -1);
-      current_thread = saved_thread;
-      regcache->registers_valid = 1;
-    }
-
-  return regcache;
-}
-
-/* See gdbsupport/common-regcache.h.  */
-
-struct regcache *
-get_thread_regcache_for_ptid (ptid_t ptid)
-{
-  return get_thread_regcache (find_thread_ptid (ptid), 1);
-}
-
-void
-regcache_invalidate_thread (struct thread_info *thread)
-{
-  struct regcache *regcache;
-
-  regcache = thread_regcache_data (thread);
-
-  if (regcache == NULL)
-    return;
-
-  if (regcache->registers_valid)
-    {
-      struct thread_info *saved_thread = current_thread;
-
-      current_thread = thread;
-      store_inferior_registers (regcache, -1);
-      current_thread = saved_thread;
-    }
-
-  regcache->registers_valid = 0;
-}
-
-/* See regcache.h.  */
-
-void
-regcache_invalidate_pid (int pid)
-{
-  /* Only invalidate the regcaches of threads of this process.  */
-  for_each_thread (pid, regcache_invalidate_thread);
-}
-
-/* See regcache.h.  */
-
-void
-regcache_invalidate (void)
-{
-  /* Only update the threads of the current process.  */
-  int pid = current_thread->id.pid ();
-
-  regcache_invalidate_pid (pid);
-}
-
-#endif
-
-struct regcache *
-init_register_cache (struct regcache *regcache,
-		     const struct target_desc *tdesc,
-		     unsigned char *regbuf)
-{
-  if (regbuf == NULL)
-    {
-#ifndef IN_PROCESS_AGENT
-      /* Make sure to zero-initialize the register cache when it is
-	 created, in case there are registers the target never
-	 fetches.  This way they'll read as zero instead of
-	 garbage.  */
-      regcache->tdesc = tdesc;
-      regcache->registers
-	= (unsigned char *) xcalloc (1, tdesc->registers_size);
-      regcache->registers_owned = 1;
-      regcache->register_status
-	= (unsigned char *) xmalloc (tdesc->reg_defs.size ());
-      memset ((void *) regcache->register_status, REG_UNAVAILABLE,
-	      tdesc->reg_defs.size ());
-#else
-      gdb_assert_not_reached ("can't allocate memory from the heap");
-#endif
-    }
-  else
-    {
-      regcache->tdesc = tdesc;
-      regcache->registers = regbuf;
-      regcache->registers_owned = 0;
-#ifndef IN_PROCESS_AGENT
-      regcache->register_status = NULL;
-#endif
-    }
-
-  regcache->registers_valid = 0;
-
-  return regcache;
-}
-
-#ifndef IN_PROCESS_AGENT
-
-struct regcache *
-new_register_cache (const struct target_desc *tdesc)
-{
-  struct regcache *regcache = new struct regcache;
-
-  gdb_assert (tdesc->registers_size != 0);
-
-  return init_register_cache (regcache, tdesc, NULL);
-}
-
-void
-free_register_cache (struct regcache *regcache)
-{
-  if (regcache)
-    {
-      if (regcache->registers_owned)
-	free (regcache->registers);
-      free (regcache->register_status);
-      delete regcache;
-    }
-}
-
-#endif
-
-void
-regcache_cpy (struct regcache *dst, struct regcache *src)
-{
-  gdb_assert (src != NULL && dst != NULL);
-  gdb_assert (src->tdesc == dst->tdesc);
-  gdb_assert (src != dst);
-
-  memcpy (dst->registers, src->registers, src->tdesc->registers_size);
-#ifndef IN_PROCESS_AGENT
-  if (dst->register_status != NULL && src->register_status != NULL)
-    memcpy (dst->register_status, src->register_status,
-	    src->tdesc->reg_defs.size ());
-#endif
-  dst->registers_valid = src->registers_valid;
-}
-
-/* Return a reference to the description of register N.  */
-
-static const struct reg &
-find_register_by_number (const struct target_desc *tdesc, int n)
-{
-  return tdesc->reg_defs[n];
-}
-
-#ifndef IN_PROCESS_AGENT
-
-void
-registers_to_string (struct regcache *regcache, char *buf)
-{
-  unsigned char *registers = regcache->registers;
-  const struct target_desc *tdesc = regcache->tdesc;
-
-  for (int i = 0; i < tdesc->reg_defs.size (); ++i)
-    {
-      if (regcache->register_status[i] == REG_VALID)
-	{
-	  bin2hex (registers, buf, register_size (tdesc, i));
-	  buf += register_size (tdesc, i) * 2;
-	}
-      else
-	{
-	  memset (buf, 'x', register_size (tdesc, i) * 2);
-	  buf += register_size (tdesc, i) * 2;
-	}
-      registers += register_size (tdesc, i);
-    }
-  *buf = '\0';
-}
-
-void
-registers_from_string (struct regcache *regcache, char *buf)
-{
-  int len = strlen (buf);
-  unsigned char *registers = regcache->registers;
-  const struct target_desc *tdesc = regcache->tdesc;
-
-  if (len != tdesc->registers_size * 2)
-    {
-      warning ("Wrong sized register packet (expected %d bytes, got %d)",
-	       2 * tdesc->registers_size, len);
-      if (len > tdesc->registers_size * 2)
-	len = tdesc->registers_size * 2;
-    }
-  hex2bin (buf, registers, len / 2);
-}
-
-int
-find_regno (const struct target_desc *tdesc, const char *name)
-{
-  for (int i = 0; i < tdesc->reg_defs.size (); ++i)
-    {
-      if (strcmp (name, find_register_by_number (tdesc, i).name) == 0)
-	return i;
-    }
-  internal_error (__FILE__, __LINE__, "Unknown register %s requested",
-		  name);
-}
-
-static void
-free_register_cache_thread (struct thread_info *thread)
-{
-  struct regcache *regcache = thread_regcache_data (thread);
-
-  if (regcache != NULL)
-    {
-      regcache_invalidate_thread (thread);
-      free_register_cache (regcache);
-      set_thread_regcache_data (thread, NULL);
-    }
-}
-
-void
-regcache_release (void)
-{
-  /* Flush and release all pre-existing register caches.  */
-  for_each_thread (free_register_cache_thread);
-}
-#endif
-
-int
-register_cache_size (const struct target_desc *tdesc)
-{
-  return tdesc->registers_size;
-}
-
-int
-register_size (const struct target_desc *tdesc, int n)
-{
-  return find_register_by_number (tdesc, n).size / 8;
-}
-
-/* See gdbsupport/common-regcache.h.  */
-
-int
-regcache_register_size (const struct regcache *regcache, int n)
-{
-  return register_size (regcache->tdesc, n);
-}
-
-static unsigned char *
-register_data (const struct regcache *regcache, int n, int fetch)
-{
-  return (regcache->registers
-	  + find_register_by_number (regcache->tdesc, n).offset / 8);
-}
-
-void
-supply_register (struct regcache *regcache, int n, const void *buf)
-{
-  return regcache->raw_supply (n, buf);
-}
-
-/* See gdbsupport/common-regcache.h.  */
-
-void
-regcache::raw_supply (int n, const void *buf)
-{
-  if (buf)
-    {
-      memcpy (register_data (this, n, 0), buf, register_size (tdesc, n));
-#ifndef IN_PROCESS_AGENT
-      if (register_status != NULL)
-	register_status[n] = REG_VALID;
-#endif
-    }
-  else
-    {
-      memset (register_data (this, n, 0), 0, register_size (tdesc, n));
-#ifndef IN_PROCESS_AGENT
-      if (register_status != NULL)
-	register_status[n] = REG_UNAVAILABLE;
-#endif
-    }
-}
-
-/* Supply register N with value zero to REGCACHE.  */
-
-void
-supply_register_zeroed (struct regcache *regcache, int n)
-{
-  memset (register_data (regcache, n, 0), 0,
-	  register_size (regcache->tdesc, n));
-#ifndef IN_PROCESS_AGENT
-  if (regcache->register_status != NULL)
-    regcache->register_status[n] = REG_VALID;
-#endif
-}
-
-#ifndef IN_PROCESS_AGENT
-
-/* Supply register called NAME with value zero to REGCACHE.  */
-
-void
-supply_register_by_name_zeroed (struct regcache *regcache,
-				const char *name)
-{
-  supply_register_zeroed (regcache, find_regno (regcache->tdesc, name));
-}
-
-#endif
-
-/* Supply the whole register set whose contents are stored in BUF, to
-   REGCACHE.  If BUF is NULL, all the registers' values are recorded
-   as unavailable.  */
-
-void
-supply_regblock (struct regcache *regcache, const void *buf)
-{
-  if (buf)
-    {
-      const struct target_desc *tdesc = regcache->tdesc;
-
-      memcpy (regcache->registers, buf, tdesc->registers_size);
-#ifndef IN_PROCESS_AGENT
-      {
-	int i;
-
-	for (i = 0; i < tdesc->reg_defs.size (); i++)
-	  regcache->register_status[i] = REG_VALID;
-      }
-#endif
-    }
-  else
-    {
-      const struct target_desc *tdesc = regcache->tdesc;
-
-      memset (regcache->registers, 0, tdesc->registers_size);
-#ifndef IN_PROCESS_AGENT
-      {
-	int i;
-
-	for (i = 0; i < tdesc->reg_defs.size (); i++)
-	  regcache->register_status[i] = REG_UNAVAILABLE;
-      }
-#endif
-    }
-}
-
-#ifndef IN_PROCESS_AGENT
-
-void
-supply_register_by_name (struct regcache *regcache,
-			 const char *name, const void *buf)
-{
-  supply_register (regcache, find_regno (regcache->tdesc, name), buf);
-}
-
-#endif
-
-void
-collect_register (struct regcache *regcache, int n, void *buf)
-{
-  regcache->raw_collect (n, buf);
-}
-
-/* See gdbsupport/common-regcache.h.  */
-
-void
-regcache::raw_collect (int n, void *buf) const
-{
-  memcpy (buf, register_data (this, n, 1), register_size (tdesc, n));
-}
-
-enum register_status
-regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
-			    ULONGEST *val)
-{
-  int size;
-
-  gdb_assert (regcache != NULL);
-  gdb_assert (regnum >= 0
-	      && regnum < regcache->tdesc->reg_defs.size ());
-
-  size = register_size (regcache->tdesc, regnum);
-
-  if (size > (int) sizeof (ULONGEST))
-    error (_("That operation is not available on integers of more than"
-            "%d bytes."),
-          (int) sizeof (ULONGEST));
-
-  *val = 0;
-  collect_register (regcache, regnum, val);
-
-  return REG_VALID;
-}
-
-#ifndef IN_PROCESS_AGENT
-
-/* See regcache.h.  */
-
-ULONGEST
-regcache_raw_get_unsigned_by_name (struct regcache *regcache,
-				   const char *name)
-{
-  return regcache_raw_get_unsigned (regcache,
-				    find_regno (regcache->tdesc, name));
-}
-
-void
-collect_register_as_string (struct regcache *regcache, int n, char *buf)
-{
-  bin2hex (register_data (regcache, n, 1), buf,
-	   register_size (regcache->tdesc, n));
-}
-
-void
-collect_register_by_name (struct regcache *regcache,
-			  const char *name, void *buf)
-{
-  collect_register (regcache, find_regno (regcache->tdesc, name), buf);
-}
-
-/* Special handling for register PC.  */
-
-CORE_ADDR
-regcache_read_pc (struct regcache *regcache)
-{
-  CORE_ADDR pc_val;
-
-  if (the_target->read_pc)
-    pc_val = the_target->read_pc (regcache);
-  else
-    internal_error (__FILE__, __LINE__,
-		    "regcache_read_pc: Unable to find PC");
-
-  return pc_val;
-}
-
-void
-regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
-{
-  if (the_target->write_pc)
-    the_target->write_pc (regcache, pc);
-  else
-    internal_error (__FILE__, __LINE__,
-		    "regcache_write_pc: Unable to update PC");
-}
-
-#endif
-
-/* See gdbsupport/common-regcache.h.  */
-
-enum register_status
-regcache::get_register_status (int regnum) const
-{
-#ifndef IN_PROCESS_AGENT
-  gdb_assert (regnum >= 0 && regnum < tdesc->reg_defs.size ());
-  return (enum register_status) (register_status[regnum]);
-#else
-  return REG_VALID;
-#endif
-}
-
-/* See gdbsupport/common-regcache.h.  */
-
-bool
-regcache::raw_compare (int regnum, const void *buf, int offset) const
-{
-  gdb_assert (buf != NULL);
-
-  const unsigned char *regbuf = register_data (this, regnum, 1);
-  int size = register_size (tdesc, regnum);
-  gdb_assert (size >= offset);
-
-  return (memcmp (buf, regbuf + offset, size - offset) == 0);
-}