# Copyright 2000, 2002, 2003, 2004, 2005, 2006, 2007
# 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.  

# This file is based on config/gdbserver.exp, which was written by
# Michael Snyder (msnyder@redhat.com).

#
# 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 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 gdb,socketport
#	Port id to use for socket connection.  If not set explicitly,
#	it will start at "2345" and increment for each use.
#

#
# gdb_target_cmd
# Send gdb the "target" command
#
proc gdb_target_cmd { targetname serialport } {
    global gdb_prompt

    for {set i 1} {$i <= 3} {incr i} {
	send_gdb "target $targetname $serialport\n"
	gdb_expect 60 {
	    -re "A program is being debugged already.*ill it.*y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "Couldn't establish connection to remote.*$gdb_prompt $" {
		verbose "Connection failed"
	    }
	    -re "Remote MIPS debugging.*$gdb_prompt" {
		verbose "Set target to $targetname"
		return 0
	    }
	    -re "Remote debugging using .*$serialport.*$gdb_prompt $" {
		verbose "Set target to $targetname"
		return 0
	    }
	    -re "Remote target $targetname connected to.*$gdb_prompt $" {
		verbose "Set target to $targetname"
		return 0
	    }
	    -re "Connected to.*$gdb_prompt $" { 
		verbose "Set target to $targetname"
		return 0
	    }
	    -re "Ending remote.*$gdb_prompt $" { }
	    -re "Connection refused.*$gdb_prompt $" {
		verbose "Connection refused by remote target.  Pausing, and trying again."
		sleep 30
		continue
	    }
	    -re "Timeout reading from remote system.*$gdb_prompt $" {
		verbose "Got timeout error from gdb."
	    }
	    timeout {
		send_gdb ""
		break
	    }
	}
    }
    return 1
}


global portnum
set portnum "2345"

# Locate the gdbserver binary.  Returns "" if gdbserver could not be found.

proc find_gdbserver { } {
  global GDB

  if [target_info exists gdb_server_prog] {
    return [target_info gdb_server_prog]
  }

  set gdbserver "${GDB}server"
  if { [file isdirectory $gdbserver] } {
    append gdbserver "/gdbserver"
  }

  if { [file executable $gdbserver] } {
    return $gdbserver
  }

  return ""
}

# Return non-zero if we should skip gdbserver-specific tests.

proc skip_gdbserver_tests { } {
  if { [find_gdbserver] == "" } {
    return 1
  }

  return 0
}

# Start a gdbserver process running SERVER_EXEC, and connect GDB
# to it.  CHILD_ARGS are passed to the inferior.
#
# Returns the target protocol and socket to connect to.

proc gdbserver_spawn { server_exec child_args } {
    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"
    }

    set gdbserver [find_gdbserver]

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

    # Fire off the debug agent.  This flavour of gdbserver takes as
    # arguments the port information, the name of the executable file to
    # be debugged, and any arguments.
    set gdbserver_command "$gdbserver :$portnum $server_exec"
    if { $child_args != "" } {
	append gdbserver_command " $child_args"
    }

    set server_spawn_id [remote_spawn target $gdbserver_command]

    # Wait for the server to produce at least one line and an additional
    # character of output.  This will wait until any TCP socket has been
    # created, so that GDB can connect.
    expect {
	-i $server_spawn_id
	-notransfer
	-re ".*\n." { }
    }

    # We can't just call close, because if gdbserver is local then that means
    # that it will get a SIGHUP.  Doing it this way could also allow us to
    # get at the inferior's input or output if necessary, and means that we
    # don't need to redirect output.
    expect_background {
	-i $server_spawn_id
	-re "." { }
	eof {
	    # The spawn ID is already closed now (but not yet waited for).
	    wait -i $expect_out(spawn_id)
	}
    }

    return [list $protocol $gdbport]
}

proc infer_host_exec { } {
    set host_exec ""

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

    return $host_exec
}

# Start a gdbserver process running HOST_EXEC and pass CHILD_ARGS
# to it.  Return 0 on success, or non-zero on failure.

proc gdbserver_load { host_exec child_args } {
    global gdbserver_host_exec
    global gdbserver_server_exec

    # If we weren't passed an explicit binary, try to reuse the current
    # one.  If we were, be sure to redownload it.

    if { $host_exec == "" && $gdbserver_host_exec == "" } {
	set gdbserver_host_exec [infer_host_exec]
    } elseif { $host_exec != "" } {
	set gdbserver_host_exec $host_exec
	if [info exists gdbserver_server_exec] { unset gdbserver_server_exec }
    }

    if { ! [info exists gdbserver_server_exec] } {
	if [is_remote target] {
	    set gdbserver_server_exec [remote_download target $host_exec /tmp/[file tail $gdbserver_host_exec].[pid]]
	} else {
	    set gdbserver_server_exec $gdbserver_host_exec
	}
    }

    set res [gdbserver_spawn $gdbserver_server_exec $child_args]
    set protocol [lindex $res 0]
    set gdbport [lindex $res 1]

    if { $host_exec != "" } {
	if [gdb_file_cmd $host_exec] {
	    return -1
	}
    }
    gdb_target_cmd $protocol $gdbport
}