# Copyright (C) 1996, 1997, 1998 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., 675 Mass Ave, Cambridge, MA 02139, USA.

# Please email any bugs, comments, and/or additions to this file to:
# DejaGnu@cygnus.com

# Note: some of this was cribbed from the gdb testsuite since we need
# to use some pretty standard gdb features (breakpoints in particular).

# Load up some standard junk.
load_lib remote.exp

if ![info exists board] {
    perror "$board must be set before loading gdb-comm"
}

# The number of times we've tried to download/execute this executable.
set try_again 0

#
# Delete all breakpoints and verify that they were deleted.  If anything
# goes wrong, return -1.
#
proc gdb_comm_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 $" { }
	timeout { perror "Delete all breakpoints (timeout)" ; return -1}
    }
    remote_send host "info breakpoints\n"
    remote_expect host 10 {
	-re "No breakpoints or watchpoints..*$gdb_prompt $" {}
	-re ".*$gdb_prompt $" { perror "breakpoints not deleted" ; return -1}
	timeout { perror "info breakpoints (timeout)" ; return -1}
    }
    return 0;
}

#
# Inform the debugger that we have a new exec file.
# return a -1 if anything goes wrong, 0 on success.
#
proc gdb_comm_file_cmd { arg } {
    global verbose
    global loadpath
    global loadfile
    global GDB
    global gdb_prompt
    upvar timeout timeout

    # The "file" command loads up a new symbol file for gdb, deal with
    # the various messages it might spew out.
    if [is_remote host] {
	set arg [remote_download host $arg a.out];
    }
    remote_send host "file $arg\n"
    remote_expect host 60 {
        -re "Reading symbols from.*done.*$gdb_prompt $" {
            verbose "\t\tLoaded $arg into the $GDB"
            return 0
        }
        -re "has no symbol-table.*$gdb_prompt $" {
            perror "$arg wasn't compiled with \"-g\""
            return -1
        }
        -re "A program is being debugged already.*Kill it.*y or n. $" {
            remote_send host "y\n"
	    verbose "\t\tKilling previous program being debugged"
            exp_continue
        }
        -re "Load new symbol table from \".*\".*y or n.*$" {
            remote_send host "y\n"
            remote_expect host 60 {
                -re "Reading symbols from.*done.*$gdb_prompt $" {
                    verbose "\t\tLoaded $arg with new symbol table into $GDB"
                    return 0
                }
                timeout {
                    perror "(timeout) Couldn't load $arg, other program already loaded."
                    return -1
                }
            }
	}
        -re ".*No such file or directory.*$gdb_prompt $" {
            perror "($arg) No such file or directory\n"
            return -1
        }
        -re "$gdb_prompt $" {
            perror "couldn't load $arg into $GDB."
            return -1
            }
        timeout {
            perror "couldn't load $arg into $GDB (timed out)."
            return -1
        }
	eof {
            # This is an attempt to detect a core dump, but seems not to
            # work.  Perhaps we need to match .* followed by eof, in which
            # expect does not seem to have a way to do that.
            perror "couldn't load $arg into $GDB (end of file)."
            return -1
        }
    }
    return 0;
}

# Disconnect from the target and forget that we have an executable. Returns
# -1 on failure, 0 on success.

proc gdb_comm_go_idle { } {
    global gdb_prompt;

    if ![board_info host exists fileid] {
	return -1;
    }

    remote_send host "target exec\n";
    remote_expect host 10 {
	-re "Kill it.*y or n.*$" {
	    remote_send host "y\n"
	    exp_continue;
	}
	-re "No exec.* file now.*$gdb_prompt $" { 
	    return 0;
	}
	default {
	    remote_close host;
	    return -1;
	}
    }
}

# Start GDB running with target DEST.
proc gdb_comm_start { dest } {
    global GDB
    global gdb_prompt
    global tool_root_dir

    # The variable gdb_prompt is a regexp which matches the gdb prompt.  Set it
    # if it is not already set.
    if ![board_info $dest exists gdb_prompt] then {
	set gdb_prompt "\\(gdb\\)"
    } else {
	set gdb_prompt [board_info $dest gdb_prompt];
    }
    # Similarly for GDB.  Look in the object directory for gdb if we aren't
    # provided with one.
    if ![info exists GDB] then {
	set GDB "[lookfor_file ${tool_root_dir} gdb/gdb]"
	if { $GDB == "" } {
	    set GDB [transform gdb]
	}
    }
    if [board_info host exists gdb_opts] {
	set gdb_opts [board_info host gdb_opts];
    } else {
	set gdb_opts ""
    }
    # Start up gdb (no startfiles, no windows) and wait for a prompt.
    remote_spawn host "$GDB $gdb_opts -nw -nx";
    remote_expect host 60 {
	-re ".*$gdb_prompt $" { }
    }
    remote_send host "set height 0\n";
    remote_expect host 10 {
	-re ".*$gdb_prompt $" {}
    }
    remote_send host "set width 0\n";
    remote_expect host 10 {
	-re ".*$gdb_prompt $" {}
    }
}

# Add a breakpoint at function FUNCTION. We assume that GDB has already been
# started.
proc gdb_comm_add_breakpoint { function } {
    global gdb_prompt

    remote_send host "break $function\n"
    remote_expect host 60 {
	-re "Breakpoint.*$gdb_prompt $" { return "" }
	-re "Function.*not defined.*$gdb_prompt $" { return "undef" }
	-re "No symbol table.*$gdb_prompt $" { return "undef" }
	default {
	    return "untested"
	}
    }
}

#
# quit_gdb -- try to quit GDB gracefully
#

proc quit_gdb { } {
    global gdb_prompt;

    set spawn_id [board_info host fileid];

    if { $spawn_id != "" && $spawn_id > -1 } {
	if { [remote_send host "quit\n"] == "" } {
	    remote_expect host 10 {
		-re ".*y or n.*$" {
		    remote_send host "y\n";
		    exp_continue;
		}
		-re ".*\[*\]\[*\]\[*\].*EXIT code" { }
		default { }
	    }
	}
    }
    if ![is_remote host] {
	remote_close host;
    }
}

proc gdb_comm_leave { } {
    if [is_remote host] {
	quit_gdb;
    } else {
	gdb_comm_go_idle;
    }
}
#
# gdb_comm_load -- load the program and execute it
#
# PROG is a full pathname to the file to load, no arguments.
# Result is "untested", "pass", "fail", etc.
#

proc gdb_comm_load { dest prog args } {
    global GDB
    global GDBFLAGS
    global gdb_prompt
    global timeout
    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"];
	}
    }
    # Make sure the file we're supposed to load really exists.
    if ![file exists $prog] then {
	perror "$prog does not exist."
        return [list "untested" ""];
    }

    if { [is_remote host] || ![board_info host exists fileid] } {
	gdb_comm_start $dest;
    }

    # Remove all breakpoints, then tell the debugger that we have
    # new exec file.
    if { [gdb_comm_delete_breakpoints] != 0 } {
	gdb_comm_leave;
	return [gdb_comm_reload $dest $prog $args];
    }
    if { [gdb_comm_file_cmd $prog] != 0 } {
	gdb_comm_leave;
	return [gdb_comm_reload $dest $prog $args];
    }
    if [board_info $dest exists gdb_sect_offset] {
	set textoff [board_info $dest gdb_sect_offset];
	remote_send host "sect .text $textoff\n";
	remote_expect host 10 {
	    -re "(0x\[0-9a-z]+) - 0x\[0-9a-z\]+ is \\.data" {
		set dataoff $expect_out(1,string);
		exp_continue;
	    }
	    -re "(0x\[0-9a-z\]+) - 0x\[0-9a-z\]+ is \\.bss" {
		set bssoff $expect_out(1,string);
		exp_continue;
	    }
	    -re "$gdb_prompt" { }
	}
	set dataoff [format 0x%x [expr $dataoff + $textoff]];
	set bssoff [format 0x%x [expr $bssoff + $textoff]];
	remote_send host "sect .data $dataoff\n";
	remote_expect host 10 {
	    -re "$gdb_prompt" { }
	}
	remote_send host "sect .bss $bssoff\n";
	remote_expect host 10 {
	    -re "$gdb_prompt" { }
	}
    }

    # Now set up breakpoints in exit, _exit, and abort.  These
    # are used to determine if a c-torture test passed or failed.  More
    # work would be necessary for things like the g++ testsuite which
    # use printf to indicate pass/fail status.

    if { [gdb_comm_add_breakpoint _exit] != "" } {
	gdb_comm_add_breakpoint exit;
    }
    gdb_comm_add_breakpoint abort;

    set protocol [board_info $dest gdb_protocol];
    if [board_info $dest exists gdb_serial] {
	set targetname [board_info $dest gdb_serial];
    } elseif [board_info $dest exists netport] {
	set targetname [board_info $dest netport];
    } else {
	if [board_info $dest exists serial] {
	    set targetname [board_info $dest serial];
	} else {
	    set targetname ""
	}
    }
    if [board_info $dest exists baud] {
	remote_send host "set remotebaud [board_info $dest baud]\n"
	remote_expect host 10 {
	    -re ".*$gdb_prompt $" {}
	    default {
		warning "failed setting baud rate";
	    }
	}
    }
    remote_send host "target $protocol $targetname\n";
    remote_expect host 60 {
	-re "Couldn.t establish conn.*$gdb_prompt $" {
	    warning "Unable to connect to $targetname with GDB."
	    quit_gdb;
	    return [gdb_comm_reload $dest $prog $args]
	}
	-re "Ending remote.*$gdb_prompt $" {
	    warning "Unable to connect to $targetname with GDB."
	    quit_gdb;
	    return [gdb_comm_reload $dest $prog $args]
	}
	-re "Remote target $protocol connected to.*$gdb_prompt $" { }
	-re "Remote target $targetname connected to.*$gdb_prompt $" { }
	-re "Connected to ARM RDI target.*$gdb_prompt $" { }
	-re "Connected to the simulator.*$gdb_prompt $" { }
	-re "Remote.*using $targetname.*$gdb_prompt $" { }
	-re "$gdb_prompt $" {
	    warning "Unable to connect to $targetname with GDB."
	    quit_gdb;
	    return [gdb_comm_reload $dest $prog $args]
	}
	-re ".*RDI_open.*should reset target.*" {
	    warning "RDI Open Failed"
	    quit_gdb;
	    return [gdb_comm_reload $dest $prog $args]
	}
	default {
	    warning "Unable to connect to $targetname with GDB."
	    quit_gdb;
	    return [gdb_comm_reload $dest $prog $args]
	}
    }

    if [target_info exists gdb_init_command] {
	remote_send host "[target_info gdb_init_command]\n";
	remote_expect host 10 {
	    -re ".*$gdb_prompt $" { }
	    default {
		gdb_comm_leave;
		return [list "fail" ""];
	    }
	}
    }
    # Now download the executable to the target board.  If communications
    # with the target are very slow the timeout might need to be increased.
    if [board_info $dest exists gdb_load_offset] {
	remote_send host "load $prog [board_info $dest gdb_load_offset]\n";
    } else {
	remote_send host "load\n"
    }
    remote_expect host 600 {
	-re "text.*data.*$gdb_prompt $" { }
	-re "data.*text.*$gdb_prompt $" { }
	-re "$gdb_prompt $" {
	    warning "Unable to send program to target board."
	    gdb_comm_leave;
	    return [gdb_comm_reload $dest $prog $args];
	}
	default {
	    warning "Unable to send program to target board."
	    gdb_comm_leave;
	    return [gdb_comm_reload $dest $prog $args];
	}
    }

    set output ""
	
    # Now start up the program and look for our magic breakpoints.
    # And a whole lot of other magic stuff too.

    if [board_info $dest exists gdb_run_command] {
	remote_send host "[board_info $dest gdb_run_command]\n";
    } else {
	remote_send host "run\n"
    }
    # FIXME: The value 300 below should be a parameter.
    if [board_info $dest exists testcase_timeout] {
	set testcase_timeout [board_info $dest testcase_timeout];
    } else {
	set testcase_timeout 300;
    }
    remote_expect host $testcase_timeout {
	-re "Line.*Jump anyway.*.y or n.*" {
	    remote_send host "y\n";
	    exp_continue;
	}
	-re "Continuing( at |\\.| with no signal\\.)\[^\r\n\]*\[\r\n\]" {
	    exp_continue;
	}
	-re ".*Start it from the beginning?.*y or n.*" {
	    remote_send host "n\n";
	    remote_expect host 10 {
		-re ".*$gdb_prompt $" {
		    remote_send host "signal 0\n";
		    remote_expect host 10 {
			-re "signal 0\[\r\n\]+" { exp_continue; }
			-re "Continuing(\\.| with no signal\\.)\[\r\n\]" {}
		    }
		}
	    }
	    exp_continue
	}
	-re "(run\[\r\n\]*|)Starting program: \[^\r\n\]*\[\r\n\]" {
	    exp_continue
	}
	-re "$gdb_prompt (signal 0|continue)\[\r\n\]+Continuing(\\.| with no signal\\.)\[\r\n\]" {
	    exp_continue
	}
	-re "(.*)Breakpoint.*exit.*=0.*$gdb_prompt $" {
	    append output $expect_out(1,string);
	    set result [check_for_board_status output];
	    gdb_comm_leave;
	    if { $result > 0 } {
		return [list "fail" $output];
	    }
	    return [list "pass" $output];
	}
	-re "(.*)Breakpoint.*exit.*=\[1-9\]\[0-9\]*.*$gdb_prompt $" {
	    append output $expect_out(1,string);
	    set result [check_for_board_status output];
	    gdb_comm_leave;
	    if { $result == 0 } {
		return [list "pass" $output];
	    }
	    if [board_info $dest exists exit_statuses_bad] {
		return [list "pass" $output];
	    }
	    return [list "fail" $output];
	}
	-re "(.*)Breakpoint.*exit.*$gdb_prompt $" {
	    append output $expect_out(1,string);
	    set status [check_for_board_status output];
	    gdb_comm_leave;
	    if { $status > 0 } {
		return [list "fail" $output];
	    }
	    return [list "pass" $output];
	}
	-re "(.*)Breakpoint.*abort.*$gdb_prompt $" {
	    append output $expect_out(1,string);
	    check_for_board_status output;
	    gdb_comm_leave;
	    return [list "fail" $output];
	}
	-re "SIGTRAP.*$gdb_prompt $" {
	    return [gdb_comm_reload $dest $prog $args];
	}
	-re "(.*)Program (received |terminated ).*$gdb_prompt $" {
	    set output $expect_out(1,string);
	    check_for_board_status output;
	    gdb_comm_leave;
	    remote_reboot $dest;
	    return [list "fail" $output];
	}
	-re "(.*)Program exited with code \[0-9\]+.*$gdb_prompt $" {
	    set output $expect_out(1,string);
	    set status [check_for_board_status output];
	    gdb_comm_leave;
	    if { $status > 0 } {
		return [list "fail" $output];
	    }
	    return [list "pass" $output];
	}
	default {
	    gdb_comm_leave;
	    if [board_info $dest exists unreliable] {
		if { [board_info $dest unreliable] > 0 } {
		    global board_info;
		    set name [board_info $dest name];
		    incr board_info($name,unreliable) -1;
		    set result [gdb_comm_reload $dest $prog $args];
		    incr board_info($name,unreliable);
		    return $result;
		}
	    }
	    return [list "fail" ""];
	}
    }
    gdb_comm_leave;
    return [list "fail" ""];
}

# If we've tried less than 4 times to load PROG, reboot the target, restart GDB
# and try again. Otherwise, return "untested".
proc gdb_comm_reload { dest prog aargs } {
    global try_again;

    # how many times have we done this?
    set n_reloads [board_info $dest n_reloads]
    if {$n_reloads == ""} {
	set n_reloads 0
    }

    # increment it
    global board_info
    set name [board_info $dest name]
    set board_info($dest,n_reloads) [expr {$n_reloads + 1}]

    # how many times are we allowed to do this?
    set max [board_info $dest max_reload_reboots]
    if {$max == ""} {
	set max 15
    }

    # if we've been doing this too much, something's very
    # wrong.  just give up, to reduce stress on boards.
    if {$max == $n_reloads} {
	perror "Too many reboots.  Giving up."
    }
    if {$max <= $n_reloads} {
	return {untested {}}
    }

    if { $try_again < 4 } {
	global GDB;
	remote_reboot $dest;
	remote_close host;
	incr try_again;
	set result [eval remote_load \"$dest\" \"$prog\" $aargs]
	set try_again 0;
	return "$result";
    } else {
	set try_again 0;
	return [list "untested" ""];
    }
}

set_board_info protocol  "gdb_comm";
