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https://sourceware.org/git/binutils-gdb.git
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347 lines
10 KiB
Plaintext
347 lines
10 KiB
Plaintext
# Copyright 2016-2020 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This test spawns a few threads that immediately exit the whole
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# process. On targets where the debugger needs to detach from each
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# thread individually (such as on the Linux kernel), the debugger must
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# handle the case of the process exiting while the detach is ongoing.
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#
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# Similarly, the process can also be killed from outside the debugger
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# (e.g., with SIGKILL), _before_ the user requests a detach. The
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# debugger must likewise detach gracefully.
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#
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# The testcase actually builds two variants of the test program:
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# single-process, and multi-process. In the multi-process variant,
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# the test program forks, and it's the fork child that spawns threads
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# that exit just while the process is being detached from. The fork
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# parent waits for its child to exit, so if GDB fails to detach from
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# the child correctly, the parent hangs. Because continuing the
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# parent can mask failure to detach from the child correctly (e.g.,
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# due to waitpid(-1,...) calls deep in the target layers managing to
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# reap the child), we try immediately detaching from the parent too,
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# and observing whether the parent exits via standard output.
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#
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# Normally, if testing with "target remote" against gdbserver, then
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# after detaching from all attached processes, gdbserver exits.
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# However, when gdbserver detaches from a process that is its own
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# direct child, gdbserver does not exit immediately. Instead it
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# "joins" (waits for) the child, only exiting when the child itself
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# exits too. Thus, on Linux, if gdbserver fails to detach from the
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# zombie child's threads correctly (or rather, reap them), it'll hang,
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# because the leader thread will only return an exit status after all
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# threads are reaped. We test that as well.
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standard_testfile
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# Test that GDBserver exits.
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proc test_server_exit {} {
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global server_spawn_id
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set test "server exits"
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gdb_expect {
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-i $server_spawn_id
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eof {
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pass $test
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wait -i $server_spawn_id
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unset server_spawn_id
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}
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timeout {
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fail "$test (timeout)"
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}
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}
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}
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# If RESULT is not zero, make the caller return.
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proc return_if_fail { result } {
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if {$result != 0} {
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return -code return
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}
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}
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# Detach from a process, and ensure that it exits after detaching.
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# This relies on inferior I/O. INF_OUTPUT_RE is the pattern that
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# matches the expected inferior output.
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proc detach_and_expect_exit {inf_output_re test} {
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global decimal
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global gdb_spawn_id
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global inferior_spawn_id
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global gdb_prompt
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return_if_fail [gdb_test_multiple "detach" $test {
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-re "Detaching from .*, process $decimal" {
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}
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}]
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# Use an indirect spawn id list, and remove inferior spawn id from
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# the expected output as soon as it matches, so that if
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# $inf_inferior_spawn_id is $server_spawn_id and we're testing in
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# "target remote" mode, the eof caused by gdbserver exiting is
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# left for the caller to handle.
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global daee_spawn_id_list
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set daee_spawn_id_list "$inferior_spawn_id $gdb_spawn_id"
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set saw_prompt 0
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set saw_inf_exit 0
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while { !$saw_prompt || ! $saw_inf_exit } {
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# We don't know what order the interesting things will arrive in.
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# Using a pattern of the form 'x|y|z' instead of -re x ... -re y
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# ... -re z ensures that expect always chooses the match that
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# occurs leftmost in the input, and not the pattern appearing
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# first in the script that occurs anywhere in the input, so that
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# we don't skip anything.
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return_if_fail [gdb_test_multiple "" $test {
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-i daee_spawn_id_list
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-re "($inf_output_re)|($gdb_prompt )" {
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if {[info exists expect_out(1,string)]} {
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verbose -log "saw inferior exit"
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set saw_inf_exit 1
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set daee_spawn_id_list "$gdb_spawn_id"
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} elseif {[info exists expect_out(2,string)]} {
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verbose -log "saw prompt"
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set saw_prompt 1
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set daee_spawn_id_list "$inferior_spawn_id"
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}
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array unset expect_out
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}
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}]
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}
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pass $test
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}
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# Run to _exit in the child.
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proc continue_to_exit_bp {} {
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gdb_breakpoint "_exit" temporary
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gdb_continue_to_breakpoint "_exit" ".*_exit.*"
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}
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# If testing single-process, simply detach from the process.
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#
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# If testing multi-process, first detach from the child, then detach
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# from the parent and confirm that the parent exits, thus ensuring
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# we've detached from the child successfully, as the parent hangs in
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# its waitpid call otherwise.
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#
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# If connected with "target remote", make sure gdbserver exits.
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#
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# CMD indicates what to do with the parent after detaching the child.
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# Can be either "detach" to detach, or "continue", to continue to
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# exit.
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#
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# CHILD_EXIT indicates how is the child expected to exit. Can be
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# either "normal" for normal exit, or "signal" for killed with signal
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# SIGKILL.
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#
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proc do_detach {multi_process cmd child_exit} {
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global decimal
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global server_spawn_id
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if {$child_exit == "normal"} {
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set continue_re "exited normally.*"
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set inf_output_re "exited, status=0"
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} elseif {$child_exit == "signal"} {
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if {$multi_process} {
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set continue_re "exited with code 02.*"
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} else {
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set continue_re "terminated with signal SIGKILL.*"
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}
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set inf_output_re "signaled, sig=9"
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} else {
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error "unhandled \$child_exit: $child_exit"
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}
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set is_remote [expr {[target_info exists gdb_protocol]
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&& [target_info gdb_protocol] == "remote"}]
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if {$multi_process} {
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gdb_test "detach" "Detaching from .*, process $decimal\r\n\\\[Inferior $decimal \\(.*\\) detached\\\]" \
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"detach child"
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gdb_test "inferior 1" "\[Switching to inferior $decimal\].*" \
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"switch to parent"
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if {$cmd == "detach"} {
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# Make sure that detach works and that the parent process
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# exits cleanly.
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detach_and_expect_exit $inf_output_re "detach parent"
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} elseif {$cmd == "continue"} {
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# Make sure that continuing works and that the parent process
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# exits cleanly.
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gdb_test "continue" $continue_re
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} else {
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perror "unhandled command: $cmd"
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}
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} else {
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if $is_remote {
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set extra "\r\nEnding remote debugging\."
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} else {
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set extra ""
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}
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if {$cmd == "detach"} {
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gdb_test "detach" "Detaching from .*, process ${decimal}\r\n\\\[Inferior $decimal \\(.*\\) detached\\\]$extra"
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} elseif {$cmd == "continue"} {
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gdb_test "continue" $continue_re
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} else {
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perror "unhandled command: $cmd"
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}
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}
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# When connected in "target remote" mode, the server should exit
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# when there are no processes left to debug.
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if { $is_remote && [info exists server_spawn_id]} {
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test_server_exit
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}
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}
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# Test detaching from a process that dies just while GDB is detaching.
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proc test_detach {multi_process cmd} {
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with_test_prefix "detach" {
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global binfile
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clean_restart ${binfile}
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if ![runto_main] {
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fail "can't run to main"
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return -1
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}
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if {$multi_process} {
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gdb_test_no_output "set detach-on-fork off"
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gdb_test_no_output "set follow-fork-mode child"
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}
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# Run to _exit in the child.
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continue_to_exit_bp
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do_detach $multi_process $cmd "normal"
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}
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}
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# Same as test_detach, except set a watchpoint before detaching.
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proc test_detach_watch {multi_process cmd} {
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with_test_prefix "watchpoint" {
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global binfile decimal
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clean_restart ${binfile}
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if ![runto_main] {
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fail "can't run to main"
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return -1
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}
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if {$multi_process} {
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gdb_test_no_output "set detach-on-fork off"
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gdb_test_no_output "set follow-fork-mode child"
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gdb_breakpoint "child_function" temporary
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gdb_continue_to_breakpoint "child_function" ".*"
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}
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# Set a watchpoint in the child.
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gdb_test "watch globalvar" ".* watchpoint $decimal: globalvar"
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# Continue to the _exit breakpoint. This arms the watchpoint
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# registers in all threads. Detaching will thus need to clear
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# them out, and handle the case of the thread disappearing
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# while doing that (on targets that need to detach from each
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# thread individually).
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continue_to_exit_bp
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do_detach $multi_process $cmd "normal"
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}
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}
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# Test detaching from a process that dies _before_ GDB starts
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# detaching.
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proc test_detach_killed_outside {multi_process cmd} {
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with_test_prefix "killed outside" {
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global binfile
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clean_restart ${binfile}
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if ![runto_main] {
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fail "can't run to main"
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return -1
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}
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gdb_test_no_output "set breakpoint always-inserted on"
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if {$multi_process} {
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gdb_test_no_output "set detach-on-fork off"
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gdb_test_no_output "set follow-fork-mode child"
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}
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# Run to _exit in the child.
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continue_to_exit_bp
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set childpid [get_integer_valueof "mypid" -1]
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if { $childpid == -1 } {
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untested "failed to extract child pid"
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return -1
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}
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remote_exec target "kill -9 ${childpid}"
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# Give it some time to die.
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sleep 2
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do_detach $multi_process $cmd "signal"
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}
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}
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# The test proper. MULTI_PROCESS is true if testing the multi-process
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# variant.
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proc do_test {multi_process cmd} {
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global testfile srcfile binfile
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if {$multi_process && $cmd == "detach"
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&& [target_info exists gdb,noinferiorio]} {
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# This requires inferior I/O to tell whether both the parent
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# and child exit successfully.
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return
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}
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set binfile [standard_output_file ${testfile}-$multi_process-$cmd]
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set options {debug pthreads}
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if {$multi_process} {
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lappend options "additional_flags=-DMULTIPROCESS"
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}
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if {[build_executable "failed to build" \
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$testfile-$multi_process-$cmd $srcfile $options] == -1} {
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return -1
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}
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test_detach $multi_process $cmd
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test_detach_watch $multi_process $cmd
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test_detach_killed_outside $multi_process $cmd
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}
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foreach multi_process {0 1} {
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set mode [expr {$multi_process ? "multi-process" : "single-process"}]
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foreach cmd {"detach" "continue"} {
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with_test_prefix "$mode: $cmd" {
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do_test $multi_process $cmd
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}
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}
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}
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