1# This testcase is part of GDB, the GNU debugger. 2 3# Copyright 2009-2020 Free Software Foundation, Inc. 4 5# This program is free software; you can redistribute it and/or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation; either version 3 of the License, or 8# (at your option) any later version. 9# 10# This program is distributed in the hope that it will be useful, 11# but WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13# GNU General Public License for more details. 14# 15# You should have received a copy of the GNU General Public License 16# along with this program. If not, see <http://www.gnu.org/licenses/>. 17 18# Test GDB can cope with two watchpoints being hit by different threads at the 19# same time, GDB reports one of them and after "continue" to report the other 20# one GDB should not be confused by differently set watchpoints that time. 21# This is the goal of "reorder1". "reorder0" tests the basic functionality of 22# two watchpoints being hit at the same time, without reordering them during the 23# stop. The formerly broken functionality is due to the all-stop mode default 24# "show breakpoint always-inserted" being "off". Formerly the remembered hit 25# could be assigned during continuation of a thread with pending SIGTRAP to the 26# different/new watchpoint, just based on the watchpoint/debug register number. 27 28if {[skip_hw_watchpoint_access_tests] 29 || [skip_hw_watchpoint_multi_tests] 30 || ![istarget *-*-linux*]} { 31 return 0 32} 33 34standard_testfile 35if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" ${binfile} executable [list debug additional_flags=-lrt]] != "" } { 36 return -1 37} 38 39foreach reorder {0 1} { with_test_prefix "reorder$reorder" { 40 41 clean_restart $testfile 42 43 gdb_test "set can-use-hw-watchpoints 1" 44 45 if ![runto_main] { 46 return -1 47 } 48 49 # Use "rwatch" as "watch" would report the watchpoint changed just based on its 50 # read memory value during a stop by unrelated event. We are interested in not 51 # losing the hardware watchpoint trigger. 52 53 gdb_test "rwatch thread1_rwatch" "Hardware read watchpoint \[0-9\]+: thread1_rwatch" 54 set test "rwatch thread2_rwatch" 55 gdb_test_multiple $test $test { 56 -re "Target does not support this type of hardware watchpoint\\.\r\n$gdb_prompt $" { 57 # ppc64 supports at most 1 hw watchpoints. 58 unsupported $test 59 return 60 } 61 -re "Hardware read watchpoint \[0-9\]+: thread2_rwatch\r\n$gdb_prompt $" { 62 pass $test 63 } 64 } 65 gdb_breakpoint [gdb_get_line_number "break-at-exit"] 66 67 # The watchpoints can happen in arbitrary order depending on random: 68 # SEL: Found 2 SIGTRAP events, selecting #[01] 69 # As GDB contains no srand() on the specific host/OS it will behave always the 70 # same. Such order cannot be guaranteed for GDB in general. 71 72 gdb_test "continue" \ 73 "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \ 74 "continue a" 75 76 if $reorder { 77 # GDB orders watchpoints by their addresses so inserting new variables 78 # with lower addresses will shift the former watchpoints to higher 79 # debug registers. 80 81 gdb_test "rwatch unused1_rwatch" "Hardware read watchpoint \[0-9\]+: unused1_rwatch" 82 gdb_test "rwatch unused2_rwatch" "Hardware read watchpoint \[0-9\]+: unused2_rwatch" 83 } 84 85 gdb_test "continue" \ 86 "Hardware read watchpoint \[0-9\]+: thread\[12\]_rwatch\r\n\r\nValue = 0\r\n0x\[0-9a-f\]+ in thread\[12\]_func .*" \ 87 "continue b" 88 89 # While the debug output itself is not checked in this testcase one bug was 90 # found in the DEBUG_INFRUN code path. 91 gdb_test "set debug infrun 1" 92 93 gdb_continue_to_breakpoint "break-at-exit" ".*break-at-exit.*" 94}} 95