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5045b3d789
This commit adds two new commands which may be used to test thread
debugging libraries used by GDB:
* "maint check libthread-db" tests the thread debugging library GDB
is using for the current inferior.
* "maint set/show check-libthread-db" selects whether libthread_db
tests should be run automatically as libthread_db is auto-loaded.
The default is to not run tests automatically.
The test itself is a basic integrity check exercising all libthread_db
functions used by GDB on GNU/Linux systems. By extension this also
exercises the proc_service functions provided by GDB that libthread_db
uses.
This functionality is useful for NPTL developers and libthread_db
developers. It could also prove useful investigating bugs reported
against GDB where the thread debugging library or GDB's proc_service
layer is suspect.
gdb/ChangeLog:
* linux-thread-db.c (valprint.h): New include.
(struct check_thread_db_info): New structure.
(check_thread_db_on_load, tdb_testinfo): New static globals.
(check_thread_db, check_thread_db_callback): New functions.
(try_thread_db_load_1): Run integrity checks if requested.
(maintenance_check_libthread_db): New function.
(_initialize_thread_db): Register "maint check libthread-db"
and "maint set/show check-libthread-db".
* NEWS: Mention the above new commands.
gdb/doc/ChangeLog:
* gdb.texinfo (Maintenance Commands): Document "maint check
libthread-db" and "maint set/show check-libthread-db".
gdb/testsuite/ChangeLog:
* gdb.threads/check-libthread-db.exp: New file.
* gdb.threads/check-libthread-db.c: Likewise.
115 lines
3.9 KiB
Plaintext
115 lines
3.9 KiB
Plaintext
# Copyright 2017-2018 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 only works for native processes on GNU/Linux.
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if {[target_info gdb_protocol] != "" || ![istarget *-linux*]} {
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continue
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}
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standard_testfile
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if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
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executable debug] != "" } {
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return -1
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}
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with_test_prefix "user-initiated check" {
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# User-initiated check with libthread_db not loaded.
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clean_restart ${binfile}
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gdb_test "maint show check-libthread-db" \
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"Whether to check libthread_db at load time is off."
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gdb_test_no_output "set stop-on-solib-events 1"
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gdb_run_cmd
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gdb_test "" \
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".*Stopped due to shared library event.*no libraries added or removed.*"
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gdb_test "maint check libthread-db" \
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"No libthread_db loaded" \
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"no libpthread.so loaded"
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# User-initiated check with NPTL uninitialized.
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# libthread_db should fake a single thread with th_unique == NULL.
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gdb_test "continue" \
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".*Stopped due to shared library event.*Inferior loaded .*libpthread.*"
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gdb_test_sequence "maint check libthread-db" \
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"libpthread.so not initialized" {
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"\[\r\n\]+Running libthread_db integrity checks:"
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"\[\r\n\]+\[ \]+Got thread 0x0 => \[0-9\]+ => 0x0 ... OK"
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"\[\r\n\]+libthread_db integrity checks passed."
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}
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# User-initiated check with NPTL fully operational.
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gdb_test_no_output "set stop-on-solib-events 0"
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gdb_breakpoint break_here
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gdb_continue_to_breakpoint break_here
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gdb_test_sequence "maint check libthread-db" \
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"libpthread.so fully initialized" {
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"\[\r\n\]+Running libthread_db integrity checks:"
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"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+; errno = 23 ... OK"
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"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+; errno = 42 ... OK"
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"\[\r\n\]+libthread_db integrity checks passed."
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}
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}
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with_test_prefix "automated load-time check" {
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# Automated load-time check with NPTL uninitialized.
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with_test_prefix "libpthread.so not initialized" {
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clean_restart ${binfile}
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gdb_test_no_output "maint set check-libthread-db 1"
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gdb_test_no_output "set debug libthread-db 1"
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gdb_breakpoint break_here
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gdb_run_cmd
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gdb_test_sequence "" \
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"check debug libthread-db output" {
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"\[\r\n\]+Running libthread_db integrity checks:"
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"\[\r\n\]+\[ \]+Got thread 0x0 => \[0-9\]+ => 0x0 ... OK"
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"\[\r\n\]+libthread_db integrity checks passed."
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"\[\r\n\]+[Thread debugging using libthread_db enabled]"
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}
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}
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# Automated load-time check with NPTL fully operational.
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with_test_prefix "libpthread.so fully initialized" {
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clean_restart ${binfile}
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gdb_test_no_output "maint set check-libthread-db 1"
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gdb_test_no_output "set debug libthread-db 1"
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set test_spawn_id [spawn_wait_for_attach $binfile]
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set testpid [spawn_id_get_pid $test_spawn_id]
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gdb_test_sequence "attach $testpid" \
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"check debug libthread-db output" {
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"\[\r\n\]+Running libthread_db integrity checks:"
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"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
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"\[\r\n\]+\[ \]+Got thread 0x\[1-9a-f\]\[0-9a-f\]+ => \[0-9\]+ => 0x\[1-9a-f\]\[0-9a-f\]+ ... OK"
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"\[\r\n\]+libthread_db integrity checks passed."
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"\[\r\n\]+[Thread debugging using libthread_db enabled]"
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}
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gdb_exit
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kill_wait_spawned_process $test_spawn_id
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}
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}
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