* gdb/remote.c: Include "gdb/fileio.h".

	* gdb/remote.c: Include "gdb/fileio.h".
	(PACKET_Fopen, PACKET_Fread, PACKET_Fwrite, PACKET_Fclose): New
	enums.
	(remote_escape_output, remote_unescape_input): New functions.
	(remote_write_bytes): Use remote_escape_output.
	(readchar): Do not mask off the high bit.
	(read_frame): Print binary packets correctly.
	(getpkt_sane): Likewise.  Return the number of bytes read
	or -1.
	(remote_buffer_add_string, remote_buffer_add_bytes)
	(remote_buffer_add_int, remote_hostio_parse_result)
	(remote_hostio_send_command, remote_hostio_open)
	(remote_hostio_write, remote_hostio_read)
	(remote_hostio_close, remote_fileio_errno_to_host)
	(remote_hostio_error, fclose_cleanup, remote_download_command)
	(remote_upload_command): New functions.
	(_initialize_remote): Register new packets and remote-upload
	and remote-download commands.

	* gdb/doc/gdb.texinfo (File Transfer): New section.
	(Remote Configuration): Document Host I/O packet commands.
	(Host I/O Packets): New section.
	(Packets): Mention overloading of F prefix.

	* gdb/gdbserver/Makefile.in (OBS): Add hostio.o.
	(hostio.o): New rule.
	* gdb/gdbserver/hostio.c: New file.
	* gdb/gdbserver/remote-utils.c (putpkt_binary): New function,
	broken out from putpkt.
	(putpkt): Use it.
	(readchar): Do not mask the high bits.  Correct the buffer
	type.
	* gdb/gdbserver/server.c (main): Leave space for a trailing
	zero in the packet buffer.  Save the length of the
	received packet.  Handle Host I/O requests.  Optionally call
	putpkt_binary.
	* gdb/gdbserver/server.h (handle_f_hostio, putpkt_binary): New
	prototypes.