gdb/

gdb/
	* remote.c (PACKET_qXfer_auxv): New, renamed from PACKET_qPart_auxv.
	(remote_supported_packet): Remove #if 0.
	(remote_protocol_features): Add qPart:auxv:read.
	(remote_unescape_input): New function.
	(readchar): Don't mask off the high bit.
	(read_frame): Use fputstrn_filtered for packet data.
	(getpkt_sane): Return the number of bytes read or -1.  Use
	fputstrn_unfiltered.
	(remote_read_qxfer): New.
	(remote_xfer_partial): Use it for TARGET_OBJECT_AUXV.
	(_initialize_remote): Update packet registration.
	* defs.h (fputstrn_filtered): New prototype.
	* utils.c (fputstrn_filtered): New.
	* NEWS: Mention qXfer.
gdb/doc/
	* gdb.texinfo (OS Information): Update qPart reference to
	qXfer.
	(Remote configuration): Likewise.
	(Overview): Move @cindex to the start of a paragraph.  Talk
	about binary data encoding.
	(Packets): Refer to the overview for the details of the X
	packet encoding.
	(General Query Packets): Remove qPart description.  Add qXfer
	description.  Add an anchor to qSupported.  Correct feature
	table title.  Add a new feature for qXfer:auxv:read.
	(Interrupts): Add a missing parenthesis.
gdb/gdbserver/
	* server.c (decode_xfer_read, write_qxfer_response): New.
	(handle_query): Take a packet length argument.  Handle
	qXfer:auxv:read instead of qPart:auxv:read.  Mention it in
	the qSupported response.
	(main): Update call to handle_query.