1 # This testcase is part of GDB, the GNU debugger.
3 # Copyright 2021-2024 Free Software Foundation, Inc.
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18 # Test how GDB handles the case where a target either doesn't use 'T'
19 # packets at all or doesn't include a thread-id in a 'T' packet, AND,
20 # where the test program contains multiple threads.
22 # In general if multiple threads are executing and the target doesn't
23 # include a thread-id in its stop response then GDB will not be able
24 # to correctly figure out which thread the stop applies to.
26 # However, this test covers a very specific case, there are multiple
27 # threads but only a single thread is actually executing. So, when
28 # the stop comes from the target, without a thread-id, GDB should be
29 # able to correctly figure out which thread has stopped.
31 load_lib gdbserver-support.exp
33 require allow_gdbserver_tests
36 if { [build_executable "failed to prepare" $testfile $srcfile {debug pthreads}] == -1 } {
40 set target_binfile [gdb_remote_download target $binfile]
42 # Run the tests with different features of GDBserver disabled.
43 # TARGET_NON_STOP is passed to "maint set target-non-stop".
44 proc run_test { target_non_stop disable_feature } {
45 global binfile gdb_prompt decimal hex tdlabel_re
48 save_vars { GDBFLAGS } {
49 append GDBFLAGS " -ex \"maint set target-non-stop $target_non_stop\""
51 # If GDB and GDBserver are both running locally, set the sysroot to avoid
52 # reading files via the remote protocol.
53 if { ![is_remote host] && ![is_remote target] } {
54 set GDBFLAGS "$GDBFLAGS -ex \"set sysroot\""
57 clean_restart ${binfile}
60 # Make sure we're disconnected, in case we're testing with an
61 # extended-remote board, therefore already connected.
62 gdb_test "disconnect" ".*"
65 if { $disable_feature != "" } {
66 set packet_arg "--disable-packet=${disable_feature}"
68 set res [gdbserver_start $packet_arg $::target_binfile]
69 set gdbserver_protocol [lindex $res 0]
70 set gdbserver_gdbport [lindex $res 1]
72 # Disable XML-based thread listing, and multi-process extensions.
74 "set remote threads-packet off" \
75 "Support for the 'qXfer:threads:read' packet on future remote targets is set to \"off\"."
77 "set remote multiprocess-feature-packet off" \
78 "Support for the 'multiprocess-feature' packet on future remote targets is set to \"off\"."
80 set res [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
81 if ![gdb_assert {$res == 0} "connect"] {
85 # There should be only one thread listed at this point.
86 gdb_test_multiple "info threads" "" {
87 -re "2 ${tdlabel_re}.*$gdb_prompt $" {
90 -re "has terminated.*$gdb_prompt $" {
93 -re "\\\* 1\[\t \]*${tdlabel_re}\[^\r\n\]*\r\n$gdb_prompt $" {
98 gdb_breakpoint "unlock_worker"
99 gdb_continue_to_breakpoint "run to unlock_worker"
101 # There should be two threads at this point with thread 1 selected.
102 gdb_test "info threads" \
103 "\\\* 1\[\t \]*${tdlabel_re}\[^\r\n\]*\r\n 2\[\t \]*${tdlabel_re}\[^\r\n\]*" \
104 "second thread should now exist"
107 gdb_test "thread 2" ".*" "switch to second thread"
109 # Now turn on scheduler-locking so that when we step thread 2 only
110 # that one thread will be set running.
111 gdb_test_no_output "set scheduler-locking on"
113 # Single step thread 2. Only the one thread will step. When the
114 # thread stops, if the stop packet doesn't include a thread-id
115 # then GDB should still understand which thread stopped.
116 gdb_test_multiple "stepi" "" {
117 -re -wrap "Thread 1 received signal SIGTRAP.*" {
120 -re -wrap "$hex.*$decimal.*while \\(worker_blocked\\).*" {
125 # Check that thread 2 is still selected.
126 gdb_test "info threads" \
127 " 1\[\t \]*${tdlabel_re}\[^\r\n\]*\r\n\\\* 2\[\t \]*${tdlabel_re}\[^\r\n\]*" \
128 "second thread should still be selected after stepi"
130 # Turn scheduler locking off again so that when we continue all
131 # threads will be set running.
132 gdb_test_no_output "set scheduler-locking off"
134 # Continue until exit. The server sends a 'W' with no PID.
135 # Bad GDB gave an error like below when target is nonstop:
138 # No process or thread specified in stop reply: W00
139 gdb_continue_to_end "" continue 1
142 # Disable different features within gdbserver:
144 # Tthread: Start GDBserver, with ";thread:NNN" in T stop replies disabled,
145 # emulating old gdbservers when debugging single-threaded programs.
147 # T: Start GDBserver with the entire 'T' stop reply packet disabled,
148 # GDBserver will instead send the 'S' stop reply.
150 # Also test both all-stop and non-stop variants of the remote
152 foreach_with_prefix target-non-stop {"off" "on"} {
153 foreach_with_prefix to_disable { "" Tthread T } {
154 run_test ${target-non-stop} $to_disable