# Test framework for GDB (remote protocol) using a "gdbserver",
# ie. a debug agent running as a native process on the same or
# a different host.

#   Copyright 2000 Free Software Foundation, Inc.

# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  

# Please email any bugs, comments, and/or additions to this file to:
# bug-gdb@prep.ai.mit.edu

# This file was written by Michael Snyder. (msnyder@redhat.com)

#
# This module to be used for testing gdb with a "gdbserver" 
# built either from libremote or from gdb/gdbserver.  
#

# Load the basic testing library, and the remote stuff.
load_lib ../config/monitor.exp

#
# To be addressed or set in your baseboard config file:
#
#   set_board_info gdb_protocol "remote"
#	Unles you have a gdbserver that uses a different protocol...
#
#   set_board_info use_gdb_stub 1
#	This tells the rest of the test suite not to do things
#	like "run" which don't work well on remote targets.
#
#   set_board_info gdb,do_reload_on_run 1
#	Unles you have a gdbserver that can handle multiple sessions.
#
#   set_board_info noargs 1
#	At present there is no provision in the remote protocol
#	for passing arguments.  This test framework does not
#	address the issue, so it's best to set this variable
#	in your baseboard configuration file.  
#	FIXME: there's no reason why the test harness couldn't
#	pass commandline args when it spawns gdbserver.
#
#   set_board_info gdb,noinferiorio 1
#	Neither the traditional gdbserver nor the one in libremote
#	can presently capture stdout and relay it to GDB via the
#	'O' packet.  This means that tests involving printf will
#	fail unles you set this varibale in your baseboard
#	configuration file.
#   
#   set_board_info gdb,no_hardware_watchpoints 1
#	Unles you have a gdbserver that supports hardware watchpoints.
#	FIXME: gdb should detect if the target doesn't support them,
#	and fall back to using software watchpoints.
#
#   set_board_info gdb_server_prog
#	This will be the path to the gdbserver program you want to test.
#	Defaults to "gdbserver".
#
#   set_board_info sockethost
#	The name of the host computer whose socket is being used.
#	Defaults to "localhost".  Note: old gdbserver requires 
#	that you define this, but libremote/gdbserver does not.
#
#   set_board_info socketport
#	Port id to use for socket connection.  If not set explicitly,
#	it will start at "2345" and increment for each use.
#



#
# gdb_load -- load a file into the debugger.
#             return a -1 if anything goes wrong.
#

global server_exec;
global portnum;
set portnum "2345";

proc gdb_load { args } {
    global server_exec;
    global portnum;

    # Port id -- either specified in baseboard file, or managed here.
    if [target_info exists gdb,socketport] {
	set portnum [target_info gdb,socketport];
    } else {
	# Bump the port number to avoid conflicts with hung ports.
	incr portnum;
    }

    # Extract the local and remote host ids from the target board struct.

    if [target_info exists sockethost] {
	set debughost  [target_info sockethost];
    } else {
	set debughost "localhost:";
    }
    # Extract the protocol
    if [target_info exists gdb_protocol] {
	set protocol [target_info gdb_protocol];
    } else {
	set protocol "remote";
    }

    # Extract the name of the gdbserver, if known (default 'gdbserver').
    if [target_info exists gdb_server_prog] {
	set gdbserver [target_info gdb_server_prog];
    } else {
	set gdbserver "gdbserver";
    }
    # Extract the socket hostname
    if [target_info exists sockethost] {
	set sockethost [target_info sockethost];
    } else {
	set sockethost ""
    }

    # Export the host:port pair.
    set gdbport $debughost$portnum;

    if { $args == "" || $args == "{}" } {
	if [info exists server_exec] {
	    set args $server_exec;
	} else {
	    send_gdb "info files\n";
	    gdb_expect 30 {
		-re "Symbols from \"(\[^\"\]+)\"" {
		    set args $expect_out(1,string);
		    exp_continue;
		}
		-re "Local exec file:\[\r\n\]+\[ \t\]*`(\[^'\]+)'," {
		    set args $expect_out(1,string);
		    exp_continue;
		}
		-re "$gdb_prompt $" { }
	    }
	}
    }

    # remember new exec file 
    set server_exec $args;

    # Fire off the debug agent
    remote_spawn host \
	    "$gdbserver $sockethost$portnum $args >& /dev/null < /dev/null &" \
	    writeonly 
    
    # Give it a little time to establish
    sleep 2

    # tell gdb what file we are debugging
    if [gdb_file_cmd $args] {
	return -1;
    }

    # attach to the "serial port"
    gdb_target_cmd $protocol $gdbport;

    return 0;
}