#   Copyright 1996, 1997 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 was written by Michael Snyder <msnyder@cygnus.com>.

# GDB support routines for a board using the sparclet remote debugging
# protocol.

load_lib remote.exp
load_lib gdb.exp

#
# Sparclet remote run command.
#

proc gdb_start { } {
    global gdb_prompt

    if ![file exists loader] {
	global libdir
	set loader loader;

	if [target_info exists gdb_stub_offset] {
	    set result [target_compile "${libdir}/stub-loader.c" $loader executable "libs=-Wl,-Ttext,[target_info gdb_stub_offset]"];
	} else {
	    set result [target_compile "${libdir}/stub-loader.c" $loader executable "ldscript=[target_info gdb_stub_ldscript]"];
	}
    }

    verbose -log "$gdb_prompt is gdb prompt"

    set result 0;
    for { set y 0; } { $y < 4 } { incr y } {
	if { [default_gdb_start] != 0 } {
	    return -1;
	}

	if [target_info exists baud] {
	    send_gdb "set remotebaud [target_info baud]\n"
	    gdb_expect {
		-re "$gdb_prompt" { }
		default { 
		    perror "Error setting baud rate."
		    return -1;
		}
	    }
	}

	for {set x 1;} { $x < 4 } {incr x} {
	    set result [gdb_sparclet_startup $result];
	    if { $result > 0 } {
		return 1;
	    }
	    # mmmmm, magic numbers.
	    if { $result == -42 || $result == -43 } {
		break;
	    } else {
		reboot_target;
	    }
	}
	if { $x == 4 } {
	    return -1;
	}
	gdb_exit;
	sleep 5;
    }
    return -1;
}

proc gdb_sparclet_startup { arg } {
    global gdb_prompt
    global GDB
    global verbose

    set is_running_stub 0;

    if [target_info exists serial] {
	set serial [target_info serial];
    } else {
	set serial [target_info netport];
    }
    set protocol [target_info gdb_protocol];
    set check_stub 1;
    if { $arg != -42 } {
	send_gdb "target $protocol $serial\n";
	# 10 seconds may be a bit short.
	gdb_expect 10 {
	    -re "already.*y or n." {
		gdb_send "y\n";
		exp_continue;
	    }
	    -re "Remote target.*connected to.*$gdb_prompt" { set check_stub 0; }
	    -re "$gdb_prompt" { }
	    timeout { }
	}
	if { $check_stub } {
	    verbose "timed out, checking if stub is already running"
	    send_gdb "\003";
	    sleep 1;
	    send_gdb "\003";
	    gdb_expect 10 {
		-re "$gdb_prompt" { }
		default {
		    remote_close host;
		    return -42;
		}
	    }
	}
    }
    if [target_info exists gdb_serial] {
	set gdb_serial [target_info gdb_serial];
    } else {
	set gdb_serial $serial;
    }
    if { $check_stub } {
	send_gdb "target remote $gdb_serial\n";
	gdb_expect 15 {
	    -re "Remote debugging.*$gdb_prompt" {
		verbose "stub is already running"
		set is_running_stub 1;
	    }
	    default {
		warning "board isn't responding";
		remote_close host;
		remote_reboot target;
		return -43;
	    }
	}
    }

    if { $is_running_stub == 0 } {
	global srcdir

	if [is_remote host] {
	    set loader [remote_download host "loader"];
	} else {
	    set loader "loader";
	}
	send_gdb "file $loader\n";
	gdb_expect {
	     -re "A program is being debug.*Kill it.*y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	     -re "Load new symbol table.*y or n. $" {
		send_gdb "y\n"
		exp_continue
	    }
	     -re "Reading symbols from.*done..*$gdb_prompt $" {}
	     -re "$gdb_prompt $" { perror "GDB couldn't find loader" }
	     timeout { 
		perror "(timeout) read symbol file" ; 
		return -1
	    }
	}

	send_gdb "target $protocol $serial\n";
	gdb_expect {
	     -re "Remote target.*connected to.*$gdb_prompt" { }
	     default {
		perror "Error reconnecting to board.";
		return -1;
	    }
	}

	send_gdb "load $loader [target_info gdb_stub_offset]\n"
	verbose "Loading $loader into $GDB" 2
	set no_run_command 0;
	gdb_expect 1200 {
	     -re "Loading.*$gdb_prompt $" {
		verbose "Loaded $loader into $GDB" 1
	    }
	    -re "Transfer rate:.*Switching to remote protocol.*Remote debugging" {
		set no_run_command 1;
	    }
	     -re "$gdb_prompt $"     {
		if $verbose>1 then {
		    perror "GDB couldn't load."
		}
	    }
	     timeout {
		if $verbose>1 then {
		    perror "Timed out trying to load $arg."
		}
	    }
	}

	if !$no_run_command {
	    send_gdb "run\n";
	    gdb_expect 60 {
		-re "A program is being debug.*Kill it.*y or n. $" {
		    send_gdb "y\n"
		    exp_continue
		}
		-re "The program being debugged .*y or n. $" {
		    send_gdb "y\n"
		    exp_continue
		}
		-re "Starting program:.*loader.*$" { 
		    verbose "Starting loader succeeded" 
		}
		timeout { 
		    perror "(timeout) starting the loader" ; 
		    return -1 
		}
		default {
		    perror "error starting the loader";
		}
	    }
	}
	sleep 2;
	send_gdb ""
	sleep 1;
	send_gdb ""
	verbose "Sent ^C^C"
	gdb_expect 10 {
	     -re "Give up .and stop debugging it.*$" {
		send_gdb "y\n"
		exp_continue
	    }
	    -re "$gdb_prompt $" { 
		verbose "Running loader succeeded" 
	    }
	    timeout { 
		warning "(timeout) interrupting the loader" ;
		remote_close host;
	    }
	    default {
		warning "error interrupting the loader";
	    }
	}

	gdb_exit;
	return [gdb_start];
    }
    return 1;
}

proc gdb_run_cmd { args } {
    global gdb_prompt

    gdb_breakpoint exit;
    send_gdb "set \$fp=0\n";
    gdb_expect {
	 -re "$gdb_prompt" { }
    }
    # This is needed for the SparcLite. Whee.
    if [target_info exists gdb,start_symbol] {
	set start_comm "jump *[target_info gdb,start_symbol]\n";
    } else {
	set start_comm "jump *start\n";
    }
    send_gdb "break copyloop\n";
    gdb_expect 10 {
	-re "Breakpoint.*$gdb_prompt $" {
	    set start_comm "continue\n";
	}
	-re "$gdb_prompt $" { }
	timeout { warning "break copyloop failed badly"; }
    }
    send_gdb $start_comm;
    gdb_expect 10 {
	-re "y or n. $" {
	    remote_send host "y\n"
	    exp_continue;
	}
	-re "Breakpoint.*in copyloop.*$gdb_prompt $" {
	    remote_send host "jump relocd\n";
	    exp_continue;
	}
	-re "Continuing at.*\[\r\n\]" { }
	default {
	    return -1;
	}
    }

    return "";
}


#
# gdb_load -- load a file into the GDB. 
#             Returns a 0 if there was an error,
#                       1 if it load successfully.
#
proc gdb_load { arg } {
    global verbose
    global loadpath
    global loadfile
    global gdb_prompt
    global GDB
    global expect_out

    set loadfile [file tail $arg]
    set loadpath [file dirname $arg]

    set protocol [target_info gdb_protocol];

    if [is_remote host] {
	set arg [remote_download host $arg];
    }
    send_gdb "file $arg\n"
    gdb_expect 30 {
	 -re "A program is being debug.*Kill it.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
         -re "Load new symbol table.*y or n. $" {
	    send_gdb "y\n"
	    exp_continue
	}
	 -re "Reading symbols from.*done..*$gdb_prompt $" {}
	 -re "$gdb_prompt $" { perror "GDB couldn't read file" }
	 timeout { 
	    perror "(timeout) read symbol file" ; 
	    return -1 
	}
    }

    if [target_info exists gdb_serial] {
	set gdb_serial [target_info gdb_serial];
    } else {
	if [target_info exists serial] {
	    set gdb_serial [target_info serial];
	} else {
	    set gdb_serial [target_info netport];
	}
    }
    send_gdb "target remote $gdb_serial\n"
    gdb_expect 30 {
	-re "Kill it?.*y or n.*" {
	    send_gdb "y\n";
	    exp_continue
	}
	-re "$gdb_prompt $"	{
	    verbose "Set remote target to $gdb_serial" 2
	}
	timeout { 
	    perror "Couldn't set remote target."
	    return -1
	}
    }
    if [target_info exists gdb_load_offset] {
	set offset "[target_info gdb_load_offset]";
    } else {
	set offset "";
    }
    send_gdb "load $arg $offset\n"
    verbose "Loading $arg into $GDB" 2
    gdb_expect 1200 {
	 -re "Loading.*$gdb_prompt $" {
	    verbose "Loaded $arg into $GDB" 1
	}
	 -re "$gdb_prompt $"     {
	    if $verbose>1 then {
		perror "GDB couldn't load."
	    }
	}
	 timeout {
	    if $verbose>1 then {
		perror "Timed out trying to load $arg."
	    }
	}
    }
    send_gdb "list main\n";
    gdb_expect 60 {
	 -re "$gdb_prompt" { }
	 default {
	    perror "command for list main never completed";
	    return -1;
	}
    }

    return 0
}