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# Copyright 2020-2021 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/>.
# Let the user override the path to the simavr binary with the SIMAVR_PATH
# environment variable.
if { [info exists ::env(SIMAVR_PATH)] } {
set simavr_path $::env(SIMAVR_PATH)
} else {
set simavr_path simavr
}
# Let the user override the simulated AVR chip with the SIMAVR_PATH environment
# variable.
#
# The value passed here must be supported by avr-gcc (see the -mmcu flag in the
# `AVR Options` section of the gcc(1) man page) and by simavr (see output of
# `simavr --list-cores`).
if { [info exists ::env(SIMAVR_MCU)] } {
set simavr_mcu $::env(SIMAVR_MCU)
} else {
set simavr_mcu atmega2560
}
set simavr_last_load_file ""
set simavr_spawn_id ""
set_board_info compiler avr-gcc
set_board_info c++compiler avr-g++
set_board_info cflags "-mmcu=${simavr_mcu}"
set_board_info ldflags "-mmcu=${simavr_mcu}"
# As of version 10, GCC produces stabs by default for AVR. Force it to use
# DWARF.
set_board_info debug_flags "-gdwarf-4"
set_board_info use_gdb_stub 1
set_board_info gdb_protocol "remote"
set_board_info gdb,do_reload_on_run 1
set_board_info noargs 1
set_board_info gdb,noinferiorio 1
set_board_info gdb,nofileio 1
set_board_info gdb,noresults 1
set_board_info gdb,nosignals 1
proc gdb_load { file } {
global simavr_last_load_file
global simavr_spawn_id
global simavr_mcu
global simavr_path
global gdb_prompt
if { $file == "" } {
set file $simavr_last_load_file
} else {
set simavr_last_load_file $file
}
gdb_file_cmd $file
# Close any previous simavr instance.
if { $simavr_spawn_id != "" } {
verbose -log "simavr: closing previous spawn id $simavr_spawn_id"
if [catch { close -i $simavr_spawn_id } != 0] {
warning "simavr: failed to close connection to previous simavr instance"
}
wait -i $simavr_spawn_id
set simavr_spawn_id ""
}
# Run simavr.
set cmd "spawn -noecho ${simavr_path} --mcu ${simavr_mcu} -g $file"
verbose -log "Spawning simavr: $cmd"
eval $cmd
set simavr_spawn_id $spawn_id
verbose -log "simavr: simavr spawned with spawn id $simavr_spawn_id, pid [exp_pid $simavr_spawn_id]"
# Wait for "listening on port" message of simavr.
expect {
-i $simavr_spawn_id -re ".*avr_gdb_init listening on port 1234" {}
timeout {
verbose -log "simavr: timeout, closing simavr spawn id"
close -i $simavr_spawn_id
verbose -log "simavr: timeout, waiting for simavr process exit"
wait -i $simavr_spawn_id
set simavr_spawn_id ""
error "unable to start simavr: timeout"
}
eof {
verbose -log "simavr: eof, waiting for simavr process exit"
wait -i $simavr_spawn_id
set simavr_spawn_id ""
error "unable to start simavr: eof"
}
}
# Connect to simavr.
send_gdb "target remote :1234\n"
gdb_expect {
-re ".*Remote debugging using :1234.*\[\r\n\]+$gdb_prompt $" {}
timeout {
verbose -log "simavr: unable to connect to simavr, closing simavr spawn id"
close -i $simavr_spawn_id
verbose -log "simavr: unable to connect to simavr, waiting for simavr process exit"
wait -i $simavr_spawn_id
set simavr_spawn_id ""
error "unable to connect to simavr stub"
}
}
return 0
}
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