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# Test Framework Driver for GDB driving an external simulator
#   Copyright 1999, 2001, 2007, 2008, 2009, 2010
#   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 3 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, see <http://www.gnu.org/licenses/>.

load_lib gdb.exp

proc sid_start {} {
    global verbose

    set port [lindex [split [target_info netport] ":"] 1]

    # Set a default endianness
    case [target_info multilib_flags] in {
        { *big-endian* *-EB* *-meb* } { set sidendian "-EB" }
        { *little-endian* *-EL* *-mel* } { set sidendian "-EL" }
        default { 
            if {[target_info exists sim,defaultendian]} then {
                set sidendian [target_info sim,defaultendian] 
            } else { 
                # rely on endianness settings in sid configuration defaults
                set sidendian ""
            }
        }
    }
    case $sidendian in {
        { -EB } { set sidendian2 {-e "set cpu endian big"} }
        { -EL } { set sidendian2 {-e "set cpu endian little"} }
        default { set sidendian2 {} }
    }

    # test to see whether to use use sid in build or install tree
    set use_build_tree [file exists ../../sid]

    if {$use_build_tree} then {
        set pre_spawn {
            global env
            set env(SID_LIBRARY_PATH) [join [glob "../../sid/component/*"] ":"]
            set env(SID) "../../sid/main/dynamic/sid"
            if {! [file exists $env(SID)]} then { error "Cannot find sid in build tree" }
        }
        if { [board_info target sim,protocol] == "sid" } {
            set spawncmd "[target_info sim] [target_info sim,options] $sidendian2 -e \"set cpu-gdb-socket sockaddr-local 0.0.0.0:$port\""
        } elseif { [board_info target sim,protocol] == "rawsid" } {
            set spawncmd "[target_info sim] [target_info sim,options] -$sidendian --gdb=$port"
        } else {
            set spawncmd "../../sid/bsp/[target_info sim] $sidendian --gdb=$port [target_info sim,options]"
        }
        set post_spawn {
            global env
            unset env(SID_LIBRARY_PATH)
            unset env(SID)
        }
    } else {
        set pre_spawn {}
        if { [board_info target sim,protocol] == "sid" } {
            # FIXME: sim,options may be from the build tree, should find
            # it in the install tree.
            set spawncmd "sid [target_info sim,options] $sidendian2 -e \"set cpu-gdb-socket sockaddr-local 0.0.0.0:$port\""
        } elseif { [board_info target sim,protocol] == "rawsid" } {
            set spawncmd "[target_info sim] [target_info sim,options] -$sidendian --gdb=$port"
        } else {
            set spawncmd "[target_info sim] $sidendian --gdb=$port [target_info sim,options]"
        }
        set post_spawn {}
    }

    eval $pre_spawn
    if {[catch [list remote_spawn host $spawncmd] msg]} {
        perror $msg
        exit 1
    }
    eval $post_spawn

    # Don't do the following any more; it breaks with "runtest ... < /dev/null"
#    expect_background {
#       -re \[^\n\]*\n { 
#           regsub "\n" $expect_out(buffer) {} msg
#           verbose "SID: $msg" 2
#       }
#    }

    # There should be no need to sleep to give SID time to start;
    # GDB would wait for a fair while for the stub to respond.
    sleep 4

    if ![target_info exists gdb,no_push_conn] {
        remote_push_conn host;
    }
}

#
# Handle GDB talking to SID
#

proc gdb_start {} {
    sid_start
    return [default_gdb_start]
}

proc sid_exit {} {
    if ![target_info exists gdb,no_push_conn] {
        remote_close host;
        remote_pop_conn host;
    }
}

proc gdb_exit {} {
    set result [default_gdb_exit]
    sid_exit
    return $result
}

#
# gdb_target_sid
# Set gdb to target the simulator
#
proc send_target_sid { } {
    # wait a little while, giving sid time to shut down & restart its
    # gdb socket
    sleep 4
    send_gdb "target [target_info gdb_protocol] [target_info netport]\n"
}

proc gdb_target_sid { } {
    global gdb_prompt
    global exit_status

    send_target_sid

    global timeout
    set prev_timeout $timeout
    set timeout 60
    verbose "Timeout is now $timeout seconds" 2
    gdb_expect {
        -re ".*\[Ee\]rror.*$gdb_prompt $" {
            perror "Couldn't set target for remote simulator."
            cleanup
            gdb_exit
        }
        -re "Remote debugging using.*$gdb_prompt"       {
            verbose "Set target to sid"
        }
        timeout { 
            perror "Couldn't set target for remote simulator."
            cleanup
            gdb_exit
        }
    }
    set timeout $prev_timeout
    verbose "Timeout is now $timeout seconds" 2
}

#
# gdb_load -- load a file into the debugger.
#             return a -1 if anything goes wrong.
#
proc gdb_load { arg } {
    global verbose
    global loadpath
    global loadfile
    global GDB
    global gdb_prompt
    global retval

    if { $arg != "" } {
        if [gdb_file_cmd $arg] then { return -1 }
    }

    gdb_target_sid

    send_gdb "load\n"
    global timeout
    set prev_timeout $timeout
    set timeout 2400
    verbose "Timeout is now $timeout seconds" 2
    gdb_expect {
        -re ".*\[Ee\]rror.*$gdb_prompt $" {
            if $verbose>1 then {
                perror "Error during download."
            }
            set retval -1;
        }
        -re ".*$gdb_prompt $" {
            if $verbose>1 then {
                send_user "Loaded $arg into $GDB\n"
            }
            set retval 0;
        }
        -re "$gdb_prompt $"     {
            if $verbose>1 then {
                perror "GDB couldn't load."
            }
            set retval -1;
        }
        timeout {
            if $verbose>1 then {
                perror "Timed out trying to load $arg."
            }
            set retval -1;
        }
    }
    set timeout $prev_timeout
    verbose "Timeout is now $timeout seconds" 2
    return $retval;
}