1 # This testcase is part of GDB, the GNU debugger.
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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.
25 set NR_TRIGGERS_PER_THREAD 2
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.
30 require allow_hw_watchpoint_tests
33 if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable [list debug "additional_flags=-DNR_THREADS=$NR_THREADS -DNR_TRIGGERS_PER_THREAD=$NR_TRIGGERS_PER_THREAD"]] != "" } {
37 clean_restart ${binfile}
39 # Force hardware watchpoints to be used.
40 gdb_test_no_output "set can-use-hw-watchpoints 1" ""
42 # Run to `main' where we begin our tests.
47 # Set some default values.
51 # Count the number of hardware watchpoints available on
54 # So we get an immediate warning/error if the target doesn't support a
55 # hardware watchpoint or run out of hardware resource.
56 gdb_test_no_output "set breakpoint always-inserted on"
58 while { $count < $NR_THREADS } {
59 # Some targets do resource counting as we insert watchpoints.
60 # Such targets won't cause a watchpoint insertion failure, but
61 # will switch to software watchpoints silently. We check for
63 gdb_test_multiple "watch watched_data\[$hwatch_count\]" \
64 "watch watched_data\[$hwatch_count\]" {
65 -re ".*Could not insert hardware watchpoint.*$gdb_prompt $" {
69 -re "Hardware watchpoint .*$gdb_prompt $" {
72 -re "Watchpoint .*$gdb_prompt $" {
80 gdb_test_no_output "set breakpoint always-inserted off"
82 # Target cannot insert hardware watchpoints. It should have reported
83 # (through board settings) that it did not support them in the first place.
85 if { $hwatch_count == 0} {
86 fail "no hardware watchpoints available"
90 # Set the testcase's internal variable indicating the number of
91 # hardware watchpoints the target supports.
92 gdb_test_no_output "set var hw_watch_count=${hwatch_count}" \
93 "set var hw_watch_count=${hwatch_count}"
95 # At this point, we know how many hardware watchpoints
96 # the target supports. Use that to do further testing.
99 # Prepare to create all the threads.
100 gdb_test "break thread_started" \
101 "Breakpoint \[0-9\]+ at .*: file .*${srcfile}, line .*" \
102 "breakpoint on thread_started"
104 # Move all threads to where they're supposed to be for testing.
105 for { set i 0 } { $i < $NR_THREADS } { incr i } {
107 # We want to set the maximum number of hardware watchpoints
108 # and make sure the target can handle that without an error.
109 # That will show us the watchpoints got replicated to all the
110 # threads correctly, and that no new watchpoints got created
111 # in the background for a specific thread.
112 if {$i < $hwatch_count} {
113 gdb_test "watch watched_data\[$i\]" \
114 "Hardware watchpoint .*"
116 verbose -log "Not setting watchpoint for watched_data\[$i\]\n"
119 gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, thread_started \\(\\) at .*$srcfile.*" \
120 "Thread $i hit breakpoint at thread_started"
123 # Let the threads run and change the watched data, leading
124 # to watchpoint triggers.
125 gdb_test_no_output "set var test_ready=1" \
126 "set var test_ready=1"
128 # Set the number of expected watchpoint triggers.
129 set TRIGGERS [expr "$NR_THREADS * $hwatch_count * $NR_TRIGGERS_PER_THREAD"]
131 # Move the threads and hit the watchpoints TRIGGERS times.
132 for { set i 1 } { $i <= $TRIGGERS } { incr i } {
133 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.*" \
134 "Continue to watchpoint trigger $i out of ${TRIGGERS} on watched_data"