#   Copyright (C) 1996-98, 1999 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:
# DejaGnu@cygnus.com

# This file was written by Michael Snyder <msnyder@cygnus.com>.

#
# Stub remote run command.
#

proc gdb_stub_init { dest args } {
    global gdb_prompt
    global GDB
    global tool_root_dir

    if ![info exists GDB] then {
	set GDB "[lookfor_file ${tool_root_dir} gdb/gdb]"
	if { $GDB == "" } {
	    set GDB [transform gdb]
	}
    }

    if [board_info $dest exists gdb_prompt] {
	set gdb_prompt [board_info $dest gdb_prompt];
    } else {
	set gdb_prompt "\\(gdb\\)"
    }

    return 1;
}

proc gdb_stub_restart { dest } {
    global gdb_prompt
    global GDB

    gdb_stub_init $dest;

    for {set x 1;} { $x < 4 } {incr x} {
	remote_close $dest;
	sleep 2;
	set command "$GDB -nw -nx";
	if [host_info exists gdb_opts] {
	    append command " [host_info gdb_opts]";
	}
	set spawn_id [remote_spawn host $command];
	remote_expect host 30 {
	    -re "$gdb_prompt" { }
	}
	if { $spawn_id >= 0 } {
	    if [board_info $dest exists baud] {
		remote_send host "set remotebaud [board_info $dest baud]\n";
		remote_expect host 5 {
		    -re "$gdb_prompt" { }
		    default {
			warning "Error setting baud rate."
			return -1;
		    }
		}
	    }


	    set value [gdb_stub_startup $dest];
	    if { $value > 0 } {
		break;
	    }
	    verbose "got $value from gdb_stub_startup";
	    remote_send host "quit\n";
	}
	remote_reboot $dest;
    }
    if { ${x} < 4 } {
	global board_info;
	set name [board_info $dest name];

	set board_info($name,gdb_is_running) 1;
	return 1;
    } else {
	return 0;
    }
}

proc gdb_stub_remote_check { dest } {
    global gdb_prompt

    if [board_info $dest exists gdb_serial] {
	set serial [board_info $dest gdb_serial];
    } elseif [board_info $dest exists serial] {
	set serial [board_info $dest serial];
    } else {
	set serial [board_info $dest netport];
    }
    remote_send host "target remote $serial\n";
    remote_expect host 10 {
	-re "Couldn't establish connection.*$gdb_prompt" {
	    return 0;
	}
	-re "Remote debugging.*$gdb_prompt" {
	    verbose "stub is already running"
	    return 1;
	}
	-re "$gdb_prompt" {
	    return 0;
	}
	timeout {
	    remote_send host "\003";
	    remote_expect host 10 {
		-re "$gdb_prompt" { }
	    }
	    return 0;
	}
	default {
	    return 0;
	}
    }
}

proc gdb_stub_startup { dest } {
    global gdb_prompt
    global GDB

    set is_running_stub 0;

    if [gdb_stub_remote_check $dest] {
	set is_running_stub 1;
    }

    if [board_info $dest exists serial] {
        set serial [board_info $dest serial];
    } else {
	set serial [board_info $dest netport];
    }

    if { ! $is_running_stub } {
	set command "target [board_info $dest gdb_protocol] $serial\n";
	remote_send host $command;
	remote_expect host 5 {
	    -re "already.*y or n." {
		remote_send host "y\n";
		exp_continue;
	    }
	    -re "appears to be alive.*$gdb_prompt" { }
	    -re "Remote target.*connected to.*$gdb_prompt" { }
	    default {
		return -1;
	    }
	}
    }
    if { $is_running_stub == 0 } {
	global libdir

	verbose "building loader";
	set loader "loader";
	if ![file exists $loader] {
	    if [board_info $dest exists gdb_stub_offset] {
		set result [target_compile "${libdir}/stub-loader.c" $loader executable "libs=-Wl,-Ttext,[board_info $dest gdb_stub_offset]"];
	    } else {
		set result [target_compile "${libdir}/stub-loader.c" $loader executable "ldscript=[board_info $dest gdb_stub_ldscript]"];
	    }
	    verbose "result is $result";
	    if [is_remote host] {
		set loader [remote_download host $loader];
	    }
	}
	remote_send host "file $loader\n";
	remote_expect host 20 {
	    -re "A program is being debug.*Kill it.*y or n. $" {
		remote_send host "y\n"
		exp_continue
	    }
	    -re "Load new symbol table.*y or n. $" {
		remote_send host "y\n"
		exp_continue
	    }
	    -re "Reading symbols from.*done..*$gdb_prompt $" {}
	    -re "$gdb_prompt $" { warning "GDB couldn't find loader" }
	    timeout { 
		warning "(timeout) read symbol file" ; 
		return -1
	    }
	}

	if [board_info $dest exists serial] {
	    set serial [board_info $dest serial];
	} else {
	    set serial [board_info $dest netport];
	}
	remote_send host "target [board_info $dest gdb_protocol] $serial\n";
	remote_expect host 60 {
	    -re "appears to be alive.*$gdb_prompt" { }
	    -re "Remote target.*connected to.*$gdb_prompt" { }
	    -re "$gdb_prompt" { 
		warning "Error reconnecting to stub.";
		return -1;
	    }
	    default {
		warning "Error reconnecting to stub.";
		return -1;
	    }
	}

	# We only send the offset if gdb_load_offset is set. Otherwise, we
	# assume that sending the offset isn't needed.
	if [board_info $dest exists gdb_load_offset] {
	    remote_send host "load $loader [board_info $dest gdb_stub_offset]\n"
	} else {
	    remote_send host "load $loader\n";
	}
	verbose "Loading $loader into $GDB" 2
	global verbose
	set no_run_command 0;
	# FIXME: The value 1200 below should be a parameter.
	remote_expect host 1200 {
	    -re "Transfer rate:.*Switching to remote protocol.*Remote debugging" {
		set no_run_command 1;
		remote_send host "";
		sleep 2;
		remote_send host "";
		sleep 1;
	    }
	    -re "Loading.*Starting.*at.*$gdb_prompt $" {
		verbose "Loaded $loader into $GDB" 1
		set no_run_command 1;
	    }
	    -re "Loading.*$gdb_prompt $" {
		verbose "Loaded $loader into $GDB" 1
	    }
	    -re "$gdb_prompt $"     {
		if $verbose>1 then {
		    warning "GDB couldn't load."
		}
	    }
	    timeout {
		if $verbose>1 then {
		    warning "Timed out trying to load $arg."
		}
	    }
	}

	if { ! $no_run_command } {
	    remote_send host "run\n";
	    remote_expect host 60 {
		-re "A program is being debug.*Kill it.*y or n. $" {
		    remote_send host "y\n"
		    exp_continue
		}
		-re "The program being debugged .*y or n. $" {
		    remote_send host "y\n"
		    exp_continue
		}
		-re "Starting program:.*loader.*$" { 
		    verbose "Starting loader succeeded" 
		}
		timeout { 
		    warning "(timeout) starting the loader" ; 
		    return -1 
		}
		default {
		    warning "error starting the loader";
		}
	    }
	    sleep 2;
	    remote_send host ""
	    sleep 1;
	    remote_send host ""
	    verbose "Sent ^C^C"
	    remote_expect host 30 {
		-re "Give up .and stop debugging it.*$" {
		    remote_send host "y\n"
		    exp_continue
		}
		-re "$gdb_prompt $" {
		    verbose "Running loader succeeded" 
		}
		timeout { 
		    warning "(timeout) interrupting the loader" ;
		    return -1 
		}
		default {
		    warning "error interrupting the loader";
		}
	    }
	}
	remote_send host "quit\n";
	return [gdb_stub_restart $dest];
    }
    return 1;
}

#
# Delete all breakpoints and verify that they were deleted.  If anything
# goes wrong we just exit.
#
proc gdb_stub_delete_breakpoints {} {
    global gdb_prompt

    remote_send host "delete breakpoints\n"
    remote_expect host 10 {
	-re "Delete all breakpoints.*y or n. $" {
	    remote_send host "y\n"
	    exp_continue
	}
	-re "$gdb_prompt $" { }
	timeout { warning "Delete all breakpoints (timeout)" ; return -1}
    }
    remote_send host "info breakpoints\n"
    remote_expect host 10 {
	-re "No breakpoints or watchpoints..*$gdb_prompt $" {}
	-re "$gdb_prompt $" { warning "breakpoints not deleted" ; return -1}
	timeout { warning "info breakpoints (timeout)" ; return -1}
    }
    return 0;
}

proc gdb_stub_go_idle { dest } {
    gdb_stub_delete_breakpoints
}

proc gdb_stub_add_breakpoint { function args } {
    global gdb_prompt

    remote_send host "break $function\n"
    remote_expect host 60 {
	-re "Breakpoint (\[0-9\]+).*$gdb_prompt $" { return $expect_out(1,string) }
	-re "Function.*not defined.*$gdb_prompt $" { return "undef" }
	-re "No symbol table.*$gdb_prompt $" { return "undef" }
	default {
	    return "undef"
	}
    }
}

proc gdb_stub_start { dest } {
    global gdb_prompt;

    set exit_brnum [gdb_stub_add_breakpoint _exit];
    if { $exit_brnum == "undef" || [board_info $dest exists always_break_exit] } {
	set exit_brnum [gdb_stub_add_breakpoint exit];
    }
    set abort_brnum [gdb_stub_add_breakpoint abort];

    upvar #0 gdb_stub_info I
    set I($dest,exit_brnum) $exit_brnum
    set I($dest,abort_brnum) $abort_brnum

    remote_send host "set \$fp=0\n";
    remote_expect host 10 {
	-re "$gdb_prompt" { }
    }
    # This is needed for the SparcLite. Whee.
    if [board_info $dest exists gdb,start_symbol] {
	set start_comm "jump *[board_info $dest gdb,start_symbol]\n";
    } else {
	set start_comm "jump *start\n";
    }
    remote_send host "break copyloop\n";
    remote_expect host 10 {
	-re "Breakpoint.*$gdb_prompt $" { 
	    set start_comm "continue\n";
	}
	-re "Function.*not defined.*$gdb_prompt $" { }
	default { }
    }
    remote_send host $start_comm;
    remote_expect host 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 { "fail" "" };
	}
    }
    return { "pass" "" };
}

proc gdb_stub_spawn { dest prog args } {
    for { set x 0; } { $x < 3 } { incr x } {
	if { [remote_ld $dest $prog] != 1 } {
	    return [list "fail" "remote_ld failed"];
	}
	
	set result [gdb_stub_start $dest];
	if { [lindex $result 0] != "pass" } {
	    remote_reboot target;
	} else {
	    return 666;		# does anyone use this value?
	}
    }
    return -1;
}

proc gdb_stub_wait { dest timeout } {
    global gdb_prompt


    upvar #0 gdb_stub_info I
    set exit_brnum $I($dest,exit_brnum)
    set abort_brnum $I($dest,abort_brnum)

    remote_expect host $timeout {
	-re "Breakpoint.*exit.*=0.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 0 ""];
	}
	-re "Breakpoint.*exit.*=\[1-9\]\[0-9\]*.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 0 ""];
	}
	-re "Breakpoint.*exit.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 0 ""];
	}
	-re "Breakpoint.*abort.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 1 ""];
	}
        -re " EXIT code 0.*$gdb_prompt $" {
            gdb_stub_go_idle $dest;
            return [list 0 ""];
        }
        -re " EXIT code \[1-9]\[0-9]*.*$gdb_prompt $" {
            gdb_stub_go_idle $dest;
            return [list 0 ""];
        }
        -re " EXIT code 4242.*$gdb_prompt $" {
            gdb_stub_go_idle $dest;
            return [list 1 ""];
        }
 	-re "Program received.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 1 ""];
	}
	-re "Program exited.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest
	    return [list 1 ""];
	}
	-re "Breakpoint $exit_brnum.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest;
	    return [list 0 ""];
	}
	-re "Breakpoint $abort_brnum.*$gdb_prompt $" {
	    gdb_stub_go_idle $dest;
	    return [list 1 ""];
	}
	default {
	    remote_close $dest;
	    remote_reboot $dest;
	    return [list -1 ""];
	}
    }
    return [list -1 ""];
}

proc gdb_stub_load { dest prog args } {
    global gdb_prompt
    set argnames { "command-line arguments" "input file" "output file" }

    for { set x 0; } { $x < [llength $args] } { incr x } {
	if { [lindex $args $x] != "" } {
	    return [list "unsupported" "no support for [lindex $argnames $x] on this target"];
	}
    }

    set result [remote_spawn $dest $prog];

    if { $result < 0 } {
	return [list "fail" "remote_spawn failed"];
    }

    # FIXME: The value 120 should be a parameter.
    set result [remote_wait $dest 120];
    set status [lindex $result 0];
    set output [lindex $result 1];
    
    if { $status == 0 } {
	return [list "pass" $output];
    } elseif { $status > 0 } {
	return [list "fail" $output];
    } else {
	global gdb_stub_retry;

	if ![info exists gdb_stub_retry] {
	    set gdb_stub_retry 1;

	    set result [eval gdb_stub_load \{$dest\} \{$prog\} $args];
	    unset gdb_stub_retry;
	    return $result;
	} else {
	    return [list "fail" $output];
	}
    }
}


#
# gdb_stub_ld -- load PROG into the board;
#             Returns a 0 if there was an error,
#                       1 if it loaded successfully.
#
proc gdb_stub_ld { dest prog } {
    global gdb_prompt
    global GDB

    if ![board_info $dest exists gdb_is_running] {
	if ![gdb_stub_restart $dest] {
	    return 0;
	}
    }

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

    remote_send host "file $prog\n"
    remote_expect host 30 {
	-re "A program is being debug.*Kill it.*y or n. $" {
	    remote_send host "y\n"
	    exp_continue
	}
        -re "Load new symbol table.*y or n. $" {
	    remote_send host "y\n"
	    exp_continue
	}
	-re "Reading symbols from.*done..*$gdb_prompt $" {}
	-re "$gdb_prompt $" {
	    # Hmmm...is retrying going to help? I kinda doubt it.
	    warning "GDB couldn't read file"
	    return [gdb_stub_retry_ld "$dest" "$prog"];
	}
	timeout { 
	    warning "(timeout) read symbol file";
	    return [gdb_stub_retry_ld "$dest" "$prog"];
	}
    }

    # just in case there are old breakpoints lying around.
    gdb_stub_delete_breakpoints

    if [board_info $dest exists gdb_serial] {
	set serial [board_info $dest gdb_serial];
    } elseif [board_info $dest exists serial] {
	set serial [board_info $dest serial];
    } else {
	set serial [board_info $dest netport];
    }

    remote_send host "target remote $serial\n"
    remote_expect host 60 {
	-re "Kill it?.*y or n.*" {
	    remote_send host "y\n";
	    exp_continue
	}
	-re "$gdb_prompt $"	{
	    verbose "Set remote target to $serial" 2
	}
	timeout { 
	    warning "Couldn't set remote target."
	    return 0
	}
    }

    if [board_info $dest exists gdb_load_offset] {
	set offset "[board_info $dest gdb_load_offset]";
    } else {
	set offset "";
    }
    remote_send host "load $prog $offset\n"
    verbose "Loading $prog into $GDB" 2
    global verbose;
    remote_expect host 1200 {
	-re "Loading.*$gdb_prompt $" {
	    verbose "Loaded $prog into $GDB" 1
	}
	-re "$gdb_prompt $"     {
	    if $verbose>1 then {
		warning "GDB couldn't load."
	    }
	}
	timeout {
	    if $verbose>1 then {
		perror "Timed out trying to load $prog."
	    }
	}
    }
    return 1
}

#
# Retry the ld operation, but only once.
#

proc gdb_stub_retry_ld { dest prog } {
    global gdb_stub_retry_ld;

    remote_reboot $dest;
    if [info exists gdb_stub_retry_ld] {
	unset gdb_stub_retry_ld;
	return 0;
    } else {
	set gdb_stub_retry_ld 1;
    }
    gdb_stub_restart $dest;
    set status [gdb_stub_ld $dest $prog];
    if [info exists gdb_stub_retry_ld] {
	unset gdb_stub_retry_ld;
    }
    return $status;
}

proc gdb_stub_close { dest } {
    global board_info
    set name [board_info $dest name];
    if [info exists board_info($name,gdb_is_running)] {
	unset board_info($name,gdb_is_running);
    }
    return [remote_close host];
}

set_board_info protocol  "gdb_stub"
