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# This testcase is part of GDB, the GNU debugger.
#
# Copyright 2018-2024 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/>.
# Test backward compatibility with older GDBservers which did not
# include ";thread:NNN" in T stop replies when debugging
# single-threaded programs, even though they'd list the main thread in
# response to qfThreadInfo/qsThreadInfo. See PR remote/22597.
load_lib gdbserver-support.exp
require allow_gdbserver_tests
standard_testfile
if { [build_executable "failed to prepare" $testfile $srcfile] == -1 } {
return -1
}
set target_binfile [gdb_remote_download target $binfile]
# Run the tests with different features of GDBserver disabled.
proc run_test { disable_feature target_nonstop } {
global binfile gdb_prompt decimal GDBFLAGS
save_vars { GDBFLAGS } {
# If GDB and GDBserver are both running locally, set the sysroot to avoid
# reading files via the remote protocol.
if { ![is_remote host] && ![is_remote target] } {
set GDBFLAGS "$GDBFLAGS -ex \"set sysroot\""
}
clean_restart ${binfile}
}
# Make sure we're disconnected, in case we're testing with an
# extended-remote board, therefore already connected.
gdb_test "disconnect" ".*"
set packet_arg ""
if { $disable_feature != "" } {
set packet_arg "--disable-packet=${disable_feature}"
}
set res [gdbserver_start $packet_arg $::target_binfile]
set gdbserver_protocol [lindex $res 0]
set gdbserver_gdbport [lindex $res 1]
# Disable XML-based thread listing, and multi-process extensions.
gdb_test \
"set remote threads-packet off" \
"Support for the 'qXfer:threads:read' packet on future remote targets is set to \"off\"."
gdb_test \
"set remote multiprocess-feature-packet off" \
"Support for the 'multiprocess-feature' packet on future remote targets is set to \"off\"."
# Set target-nonstop mode.
gdb_test_no_output "maint set target-non-stop ${target_nonstop}"
set res [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
if ![gdb_assert {$res == 0} "connect"] {
return
}
# There should be only one thread listed.
set test "info threads"
gdb_test_multiple $test $test {
-re "2 Thread.*$gdb_prompt $" {
fail $test
}
-re "has terminated.*$gdb_prompt $" {
fail $test
}
-re "\\\* 1\[\t \]*Thread\[^\r\n\]*\r\n$gdb_prompt $" {
pass $test
}
}
gdb_breakpoint "main"
# Bad GDB behaved like this:
# (gdb) c
# Cannot execute this command without a live selected thread.
# (gdb)
gdb_test "c" "Breakpoint $decimal, main.*" "continue to main"
# Continue until exit. The server sends a 'W' with no PID.
# Bad GDB gave an error like below when target is nonstop:
# (gdb) c
# Continuing.
# No process or thread specified in stop reply: W00
gdb_continue_to_end "" continue 1
}
# Disable different features within gdbserver:
#
# Tthread: Start GDBserver, with ";thread:NNN" in T stop replies disabled,
# emulating old gdbservers when debugging single-threaded programs.
#
# T: Start GDBserver with the entire 'T' stop reply packet disabled,
# GDBserver will instead send the 'S' stop reply.
foreach_with_prefix to_disable { "" Tthread T } {
foreach_with_prefix t_nonstop { off on } {
run_test $to_disable $t_nonstop
}
}
# Regression for PR gdb/26819: Cover the case when GDBserver does not report
# any threads (i.e. the remote target has no concept of threads).
#
# Scenario 1: Disable 'T' and 'qfThreadInfo' packets
# Scenario 2: Disable all threading packets
foreach_with_prefix to_disable { "T,qfThreadInfo" "threads" } {
# Non-stop mode not applicable - off.
run_test $to_disable off
}
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