1# This testcase is part of GDB, the GNU debugger. 2 3# Copyright 2009-2023 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# Check that hardware watchpoints get correctly replicated to all 19# existing threads when hardware watchpoints are created. This test 20# creates one hardware watchpoint per thread until a maximum is 21# reached. It originally addresses a deficiency seen on embedded 22# powerpc targets with slotted hardware *point designs. 23 24set NR_THREADS 10 25set NR_TRIGGERS_PER_THREAD 2 26 27# This test verifies that a hardware watchpoint gets replicated to 28# every existing thread and is detected properly. This test is 29# only meaningful on a target with hardware watchpoint support. 30if {[skip_hw_watchpoint_tests]} { 31 return 0 32} 33 34standard_testfile 35if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "additional_flags=-DNR_THREADS=$NR_THREADS -DNR_TRIGGERS_PER_THREAD=$NR_TRIGGERS_PER_THREAD"]] != "" } { 36 return -1 37} 38 39clean_restart ${binfile} 40 41# Force hardware watchpoints to be used. 42gdb_test_no_output "set can-use-hw-watchpoints 1" "" 43 44# Run to `main' where we begin our tests. 45if {![runto_main]} { 46 return 0 47} 48 49# Set some default values. 50set hwatch_count 0 51set count 0 52 53# Count the number of hardware watchpoints available on 54# this target. 55 56# So we get an immediate warning/error if the target doesn't support a 57# hardware watchpoint or run out of hardware resource. 58gdb_test_no_output "set breakpoint always-inserted on" 59 60while { $count < $NR_THREADS } { 61 # Some targets do resource counting as we insert watchpoints. 62 # Such targets won't cause a watchpoint insertion failure, but 63 # will switch to software watchpoints silently. We check for 64 # both cases here. 65 gdb_test_multiple "watch watched_data\[$hwatch_count\]" \ 66 "watch watched_data\[$hwatch_count\]" { 67 -re ".*Could not insert hardware watchpoint.*$gdb_prompt $" { 68 # End the loop. 69 set count $NR_THREADS 70 } 71 -re "Hardware watchpoint .*$gdb_prompt $" { 72 incr hwatch_count 73 } 74 -re "Watchpoint .*$gdb_prompt $" { 75 # End the loop. 76 set count $NR_THREADS 77 } 78 } 79 incr count 80} 81 82gdb_test_no_output "set breakpoint always-inserted off" 83 84# Target cannot insert hardware watchpoints. It should have reported 85# (through board settings) that it did not support them in the first place. 86# Just exit. 87if { $hwatch_count == 0} { 88 fail "no hardware watchpoints available" 89 return 0 90} 91 92# Set the testcase's internal variable indicating the number of 93# hardware watchpoints the target supports. 94gdb_test_no_output "set var hw_watch_count=${hwatch_count}" \ 95 "set var hw_watch_count=${hwatch_count}" 96 97# At this point, we know how many hardware watchpoints 98# the target supports. Use that to do further testing. 99delete_breakpoints 100 101# Prepare to create all the threads. 102gdb_test "break thread_started" \ 103 "Breakpoint \[0-9\]+ at .*: file .*${srcfile}, line .*" \ 104 "breakpoint on thread_started" 105 106# Move all threads to where they're supposed to be for testing. 107for { set i 0 } { $i < $NR_THREADS } { incr i } { 108 109 # We want to set the maximum number of hardware watchpoints 110 # and make sure the target can handle that without an error. 111 # That will show us the watchpoints got replicated to all the 112 # threads correctly, and that no new watchpoints got created 113 # in the background for a specific thread. 114 if {$i < $hwatch_count} { 115 gdb_test "watch watched_data\[$i\]" \ 116 "Hardware watchpoint .*" 117 } else { 118 verbose -log "Not setting watchpoint for watched_data\[$i\]\n" 119 } 120 121 gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, thread_started \\(\\) at .*$srcfile.*" \ 122 "Thread $i hit breakpoint at thread_started" 123} 124 125# Let the threads run and change the watched data, leading 126# to watchpoint triggers. 127gdb_test_no_output "set var test_ready=1" \ 128 "set var test_ready=1" 129 130# Set the number of expected watchpoint triggers. 131set TRIGGERS [expr "$NR_THREADS * $hwatch_count * $NR_TRIGGERS_PER_THREAD"] 132 133# Move the threads and hit the watchpoints TRIGGERS times. 134for { set i 1 } { $i <= $TRIGGERS } { incr i } { 135 gdb_test continue "Continuing\\..*Hardware watchpoint \[0-9\]+: watched_data\[\[0-9\]+\].*Old value = \[0-9\]+.*New value = \[0-9\]+.*thread_function \\(arg=$hex\\) at .*$srcfile.*" \ 136 "Continue to watchpoint trigger $i out of ${TRIGGERS} on watched_data" 137} 138