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1 | # This testcase is part of GDB, the GNU debugger. |
2 | ||
32d0add0 | 3 | # Copyright 2009-2015 Free Software Foundation, Inc. |
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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 | ||
24 | set NR_THREADS 10 | |
25 | set 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. | |
30 | if {[skip_hw_watchpoint_tests]} { | |
31 | return 0 | |
32 | } | |
33 | ||
34 | standard_testfile | |
35 | 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"]] != "" } { | |
36 | return -1 | |
37 | } | |
38 | ||
39 | clean_restart ${binfile} | |
40 | ||
41 | # Force hardware watchpoints to be used. | |
42 | gdb_test_no_output "set can-use-hw-watchpoints 1" "" | |
43 | ||
44 | # Run to `main' where we begin our tests. | |
45 | if ![runto_main] then { | |
46 | fail "Failed to run to main" | |
47 | return 0 | |
48 | } | |
49 | ||
50 | # First, break at empty_cycle. | |
51 | gdb_test "break empty_cycle" \ | |
52 | "Breakpoint 2 at .*: file .*${srcfile}, line .*" \ | |
53 | "Breakpoint on empty_cycle" | |
54 | ||
55 | # Set some default values. | |
56 | set hwatch_count 0 | |
57 | set done 0 | |
58 | ||
59 | # Count the number of hardware watchpoints available on | |
60 | # this target. | |
61 | while { $done == 0 } { | |
62 | ||
63 | gdb_test "continue" \ | |
64 | ".*Breakpoint 2, empty_cycle \\(\\) at .*${srcfile}.*" \ | |
65 | "Continue to empty_cycle to insert watchpoint $hwatch_count" | |
66 | ||
67 | # Some targets do resource counting as we insert watchpoints. | |
68 | # Such targets won't cause a watchpoint insertion failure, but | |
69 | # will switch to software watchpoints silently. We check for | |
70 | # both cases here. | |
71 | gdb_test_multiple "watch watched_data\[$hwatch_count\]" \ | |
72 | "watch watched_data\[$hwatch_count\]" { | |
73 | -re "Hardware watchpoint .*$gdb_prompt $" { | |
74 | } | |
75 | -re "Watchpoint .*$gdb_prompt $" { | |
76 | set done 1 | |
77 | break | |
78 | } | |
79 | } | |
80 | ||
81 | gdb_test_multiple "continue" "watchpoint created successfully" { | |
82 | -re ".*Breakpoint 2, empty_cycle \\(\\).*$gdb_prompt $" { | |
83 | incr hwatch_count | |
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84 | |
85 | # Some targets (like S/390) behave as though supporting | |
86 | # unlimited hardware watchpoints. In this case we just take a | |
87 | # safe exit out of the loop. | |
88 | if { $hwatch_count == $NR_THREADS } { | |
89 | set done 1 | |
90 | break | |
91 | } | |
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92 | } |
93 | -re ".*Could not insert hardware watchpoint.*$gdb_prompt $" { | |
94 | set done 1 | |
95 | break | |
96 | } | |
97 | } | |
98 | } | |
99 | ||
100 | # Target cannot insert hardware watchpoints. It should have reported | |
101 | # (through board settings) that it did not support them in the first place. | |
102 | # Just exit. | |
103 | if { $hwatch_count == 0} { | |
104 | fail "No hardware watchpoints available" | |
105 | return 0 | |
106 | } | |
107 | ||
108 | # Set the testcase's internal variable indicating the number of | |
109 | # hardware watchpoints the target supports. | |
110 | gdb_test_no_output "set var hw_watch_count=${hwatch_count}" \ | |
111 | "set var hw_watch_count=${hwatch_count}" | |
112 | ||
113 | # At this point, we know how many hardware watchpoints | |
114 | # the target supports. Use that to do further testing. | |
115 | delete_breakpoints | |
116 | ||
117 | # Break out of the empty_cycle loop by changing the | |
118 | # controlling variable. | |
119 | gdb_test_no_output "set var watch_count_done=1" \ | |
120 | "set var watch_count_done=1" | |
121 | ||
122 | # Prepare to create all the threads. | |
123 | gdb_test "break thread_started" \ | |
124 | "Breakpoint \[0-9\]+ at .*: file .*${srcfile}, line .*" \ | |
125 | "Breakpoint on thread_started" | |
126 | ||
127 | # Move all threads to where they're supposed to be for testing. | |
128 | for { set i 0 } { $i < $NR_THREADS } { incr i } { | |
129 | ||
130 | # We want to set the maximum number of hardware watchpoints | |
131 | # and make sure the target can handle that without an error. | |
132 | # That will show us the watchpoints got replicated to all the | |
133 | # threads correctly, and that no new watchpoints got created | |
134 | # in the background for a specific thread. | |
135 | if {$i < $hwatch_count} { | |
136 | gdb_test "watch watched_data\[$i\]" \ | |
137 | "Hardware watchpoint .*" \ | |
138 | "watch watched_data\[$i\]" | |
139 | } else { | |
140 | verbose -log "Not setting watchpoint for watched_data\[$i\]\n" | |
141 | } | |
142 | ||
143 | gdb_test continue "Continuing\\..*Breakpoint \[0-9\]+, thread_started \\(\\) at .*$srcfile.*" \ | |
144 | "Thread $i hit breakpoint at thread_started" | |
145 | } | |
146 | ||
147 | # Let the threads run and change the watched data, leading | |
148 | # to watchpoint triggers. | |
149 | gdb_test_no_output "set var test_ready=1" \ | |
150 | "set var test_ready=1" | |
151 | ||
152 | # Set the number of expected watchpoint triggers. | |
153 | set TRIGGERS [expr "$NR_THREADS * $hwatch_count * $NR_TRIGGERS_PER_THREAD"] | |
154 | ||
155 | # Move the threads and hit the watchpoints TRIGGERS times. | |
156 | for { set i 1 } { $i <= $TRIGGERS } { incr i } { | |
157 | 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.*" \ | |
158 | "Continue to watchpoint trigger $i out of ${TRIGGERS} on watched_data" | |
159 | } |