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, 279 insertions, 0 deletions

diff --git a/gdbserver/mem-break.h b/gdbserver/mem-break.h
new file mode 100644
index 00000000000..bbe1ff1a5fb
--- /dev/null
+++ b/gdbserver/mem-break.h
@@ -0,0 +1,279 @@
+/* Memory breakpoint interfaces for the remote server for GDB.
+   Copyright (C) 2002-2020 Free Software Foundation, Inc.
+
+   Contributed by MontaVista Software.
+
+   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_MEM_BREAK_H
+#define GDBSERVER_MEM_BREAK_H
+
+#include "gdbsupport/break-common.h"
+
+/* Breakpoints are opaque.  */
+struct breakpoint;
+struct gdb_breakpoint;
+struct fast_tracepoint_jump;
+struct raw_breakpoint;
+struct process_info;
+
+#define Z_PACKET_SW_BP '0'
+#define Z_PACKET_HW_BP '1'
+#define Z_PACKET_WRITE_WP '2'
+#define Z_PACKET_READ_WP '3'
+#define Z_PACKET_ACCESS_WP '4'
+
+/* The low level breakpoint types.  */
+
+enum raw_bkpt_type
+  {
+    /* Software/memory breakpoint.  */
+    raw_bkpt_type_sw,
+
+    /* Hardware-assisted breakpoint.  */
+    raw_bkpt_type_hw,
+
+    /* Hardware-assisted write watchpoint.  */
+    raw_bkpt_type_write_wp,
+
+    /* Hardware-assisted read watchpoint.  */
+    raw_bkpt_type_read_wp,
+
+    /* Hardware-assisted access watchpoint.  */
+    raw_bkpt_type_access_wp
+  };
+
+/* Map the protocol breakpoint/watchpoint type Z_TYPE to the internal
+   raw breakpoint type.  */
+
+enum raw_bkpt_type Z_packet_to_raw_bkpt_type (char z_type);
+
+/* Map a raw breakpoint type to an enum target_hw_bp_type.  */
+
+enum target_hw_bp_type raw_bkpt_type_to_target_hw_bp_type
+  (enum raw_bkpt_type raw_type);
+
+/* Create a new GDB breakpoint of type Z_TYPE at ADDR with kind KIND.
+   Returns a pointer to the newly created breakpoint on success.  On
+   failure returns NULL and sets *ERR to either -1 for error, or 1 if
+   Z_TYPE breakpoints are not supported on this target.  */
+
+struct gdb_breakpoint *set_gdb_breakpoint (char z_type, CORE_ADDR addr,
+					   int kind, int *err);
+
+/* Delete a GDB breakpoint of type Z_TYPE and kind KIND previously
+   inserted at ADDR with set_gdb_breakpoint_at.  Returns 0 on success,
+   -1 on error, and 1 if Z_TYPE breakpoints are not supported on this
+   target.  */
+
+int delete_gdb_breakpoint (char z_type, CORE_ADDR addr, int kind);
+
+/* Returns TRUE if there's a software or hardware (code) breakpoint at
+   ADDR in our tables, inserted, or not.  */
+
+int breakpoint_here (CORE_ADDR addr);
+
+/* Returns TRUE if there's any inserted software or hardware (code)
+   breakpoint set at ADDR.  */
+
+int breakpoint_inserted_here (CORE_ADDR addr);
+
+/* Returns TRUE if there's any inserted software breakpoint at
+   ADDR.  */
+
+int software_breakpoint_inserted_here (CORE_ADDR addr);
+
+/* Returns TRUE if there's any inserted hardware (code) breakpoint at
+   ADDR.  */
+
+int hardware_breakpoint_inserted_here (CORE_ADDR addr);
+
+/* Returns TRUE if there's any single-step breakpoint at ADDR.  */
+
+int single_step_breakpoint_inserted_here (CORE_ADDR addr);
+
+/* Clear all breakpoint conditions and commands associated with a
+   breakpoint.  */
+
+void clear_breakpoint_conditions_and_commands (struct gdb_breakpoint *bp);
+
+/* Set target-side condition CONDITION to the breakpoint at ADDR.
+   Returns false on failure.  On success, advances CONDITION pointer
+   past the condition and returns true.  */
+
+int add_breakpoint_condition (struct gdb_breakpoint *bp,
+			      const char **condition);
+
+/* Set target-side commands COMMANDS to the breakpoint at ADDR.
+   Returns false on failure.  On success, advances COMMANDS past the
+   commands and returns true.  If PERSIST, the commands should run
+   even while GDB is disconnected.  */
+
+int add_breakpoint_commands (struct gdb_breakpoint *bp, const char **commands,
+			     int persist);
+
+/* Return true if PROC has any persistent command.  */
+bool any_persistent_commands (process_info *proc);
+
+/* Evaluation condition (if any) at breakpoint BP.  Return 1 if
+   true and 0 otherwise.  */
+
+int gdb_condition_true_at_breakpoint (CORE_ADDR where);
+
+int gdb_no_commands_at_breakpoint (CORE_ADDR where);
+
+void run_breakpoint_commands (CORE_ADDR where);
+
+/* Returns TRUE if there's a GDB breakpoint (Z0 or Z1) set at
+   WHERE.  */
+
+int gdb_breakpoint_here (CORE_ADDR where);
+
+/* Create a new breakpoint at WHERE, and call HANDLER when
+   it is hit.  HANDLER should return 1 if the breakpoint
+   should be deleted, 0 otherwise.  The type of the created
+   breakpoint is other_breakpoint.  */
+
+struct breakpoint *set_breakpoint_at (CORE_ADDR where,
+				      int (*handler) (CORE_ADDR));
+
+/* Delete a breakpoint.  */
+
+int delete_breakpoint (struct breakpoint *bkpt);
+
+/* Set a single-step breakpoint at STOP_AT for thread represented by
+   PTID.  */
+
+void set_single_step_breakpoint (CORE_ADDR stop_at, ptid_t ptid);
+
+/* Delete all single-step breakpoints of THREAD.  */
+
+void delete_single_step_breakpoints (struct thread_info *thread);
+
+/* Reinsert all single-step breakpoints of THREAD.  */
+
+void reinsert_single_step_breakpoints (struct thread_info *thread);
+
+/* Uninsert all single-step breakpoints of THREAD.  This still leaves
+   the single-step breakpoints in the table.  */
+
+void uninsert_single_step_breakpoints (struct thread_info *thread);
+
+/* Reinsert breakpoints at WHERE (and change their status to
+   inserted).  */
+
+void reinsert_breakpoints_at (CORE_ADDR where);
+
+/* The THREAD has single-step breakpoints or not.  */
+
+int has_single_step_breakpoints (struct thread_info *thread);
+
+/* Uninsert breakpoints at WHERE (and change their status to
+   uninserted).  This still leaves the breakpoints in the table.  */
+
+void uninsert_breakpoints_at (CORE_ADDR where);
+
+/* Reinsert all breakpoints of the current process (and change their
+   status to inserted).  */
+
+void reinsert_all_breakpoints (void);
+
+/* Uninsert all breakpoints of the current process (and change their
+   status to uninserted).  This still leaves the breakpoints in the
+   table.  */
+
+void uninsert_all_breakpoints (void);
+
+/* See if any breakpoint claims ownership of STOP_PC.  Call the handler for
+   the breakpoint, if found.  */
+
+void check_breakpoints (CORE_ADDR stop_pc);
+
+/* See if any breakpoints shadow the target memory area from MEM_ADDR
+   to MEM_ADDR + MEM_LEN.  Update the data already read from the target
+   (in BUF) if necessary.  */
+
+void check_mem_read (CORE_ADDR mem_addr, unsigned char *buf, int mem_len);
+
+/* See if any breakpoints shadow the target memory area from MEM_ADDR
+   to MEM_ADDR + MEM_LEN.  Update the data to be written to the target
+   (in BUF, a copy of MYADDR on entry) if necessary, as well as the
+   original data for any breakpoints.  */
+
+void check_mem_write (CORE_ADDR mem_addr,
+		      unsigned char *buf, const unsigned char *myaddr, int mem_len);
+
+/* Delete all breakpoints.  */
+
+void delete_all_breakpoints (void);
+
+/* Clear the "inserted" flag in all breakpoints of PROC.  */
+
+void mark_breakpoints_out (struct process_info *proc);
+
+/* Delete all breakpoints, but do not try to un-insert them from the
+   inferior.  */
+
+void free_all_breakpoints (struct process_info *proc);
+
+/* Check if breakpoints still seem to be inserted in the inferior.  */
+
+void validate_breakpoints (void);
+
+/* Insert a fast tracepoint jump at WHERE, using instruction INSN, of
+   LENGTH bytes.  */
+
+struct fast_tracepoint_jump *set_fast_tracepoint_jump (CORE_ADDR where,
+						       unsigned char *insn,
+						       ULONGEST length);
+
+/* Increment reference counter of JP.  */
+void inc_ref_fast_tracepoint_jump (struct fast_tracepoint_jump *jp);
+
+/* Delete fast tracepoint jump TODEL from our tables, and uninsert if
+   from memory.  */
+
+int delete_fast_tracepoint_jump (struct fast_tracepoint_jump *todel);
+
+/* Returns true if there's fast tracepoint jump set at WHERE.  */
+
+int fast_tracepoint_jump_here (CORE_ADDR);
+
+/* Uninsert fast tracepoint jumps at WHERE (and change their status to
+   uninserted).  This still leaves the tracepoints in the table.  */
+
+void uninsert_fast_tracepoint_jumps_at (CORE_ADDR pc);
+
+/* Reinsert fast tracepoint jumps at WHERE (and change their status to
+   inserted).  */
+
+void reinsert_fast_tracepoint_jumps_at (CORE_ADDR where);
+
+/* Insert a memory breakpoint.  */
+
+int insert_memory_breakpoint (struct raw_breakpoint *bp);
+
+/* Remove a previously inserted memory breakpoint.  */
+
+int remove_memory_breakpoint (struct raw_breakpoint *bp);
+
+/* Create a new breakpoint list in CHILD_THREAD's process that is a
+   copy of breakpoint list in PARENT_THREAD's process.  */
+
+void clone_all_breakpoints (struct thread_info *child_thread,
+			    const struct thread_info *parent_thread);
+
+#endif /* GDBSERVER_MEM_BREAK_H */