# Copyright (C) 1992-2016 Free Software Foundation, Inc.
#
# This file is part of DejaGnu.
#
# DejaGnu 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 3 of the License, or
# (at your option) any later version.
#
# DejaGnu 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 DejaGnu; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.

# 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"