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213516ef | 1 | # Copyright 2014-2023 Free Software Foundation, Inc. |
8e9db26e PA |
2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | # Test alternating between watchpoint types, watching a sliding window | |
17 | # of addresses (thus alternating between aligned and unaligned | |
18 | # addresses). Only a single watchpoint exists at any given time. On | |
19 | # targets that only update the debug registers on resume, this | |
20 | # stresses the debug register setup code, both in GDB and in the | |
21 | # target/kernel as one watchpoint replaces the other in a single | |
22 | # operation. (Note that we don't have any of these watchpoints | |
23 | # trigger.) | |
24 | ||
a47a2d45 CL |
25 | # The skip_hw_watchpoint_tests checks if watchpoints are supported by the |
26 | # processor. On PowerPC, the check runs a small test program under gdb | |
27 | # to determine if the Power processor supports HW watchpoints. The check | |
28 | # must be done before starting the test so as to not disrupt the execution | |
29 | # of the actual test. | |
30 | ||
31 | set skip_hw_watchpoint_tests_p [skip_hw_watchpoint_tests] | |
32 | ||
33 | # starting the test. | |
34 | ||
8e9db26e PA |
35 | standard_testfile |
36 | ||
37 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { | |
38 | return -1 | |
39 | } | |
40 | ||
65a33d75 | 41 | if {![runto_main]} { |
8e9db26e PA |
42 | return 0 |
43 | } | |
44 | ||
45 | # The line we'll be stepping. | |
46 | set srcline [gdb_get_line_number "stepi line"] | |
47 | ||
48 | # The address the program is stopped at currently. | |
49 | set cur_addr "" | |
50 | ||
51 | # Get the current PC. | |
52 | ||
53 | proc get_pc {} { | |
54 | global hex gdb_prompt | |
55 | ||
56 | set addr "" | |
57 | set test "get PC" | |
58 | gdb_test_multiple "p /x \$pc" "$test" { | |
59 | -re " = ($hex).*$gdb_prompt $" { | |
60 | set addr $expect_out(1,string) | |
61 | pass "$test" | |
62 | } | |
63 | } | |
64 | ||
65 | return $addr | |
66 | } | |
67 | ||
68 | ||
69 | # Issue a stepi, and make sure the program advanced past the current | |
70 | # instruction (stored in the CUR_ADDR global). | |
71 | ||
72 | proc stepi {} { | |
73 | global hex gdb_prompt cur_addr | |
74 | ||
75 | set srcline " for (i = 0; i < 100000; i++); /* stepi line */" | |
76 | set test "stepi advanced" | |
77 | gdb_test_multiple "stepi" $test { | |
0d8683a3 TV |
78 | -re -wrap "[string_to_regexp $srcline]" { |
79 | set addr [get_valueof "/x" "\$pc" "0"] | |
8e9db26e PA |
80 | if {$addr != $cur_addr} { |
81 | pass $test | |
82 | } else { | |
83 | fail $test | |
84 | } | |
b8983c46 | 85 | set cur_addr $addr |
8e9db26e PA |
86 | } |
87 | } | |
88 | } | |
89 | ||
90 | gdb_breakpoint $srcline | |
91 | gdb_continue_to_breakpoint "stepi line" | |
3541979f | 92 | set cur_addr [get_pc] |
8e9db26e PA |
93 | |
94 | # The test tries various sequences of different types of watchpoints. | |
95 | # Probe for support first. | |
3541979f AB |
96 | proc build_cmds_list {} { |
97 | global gdb_prompt | |
98 | ||
99 | # So we get an immediate warning/error if the target doesn't support a | |
100 | # given watchpoint type. | |
101 | gdb_test_no_output "set breakpoint always-inserted on" \ | |
102 | "Set breakpoints always inserted while building cmds list" | |
103 | ||
104 | # The list of supported commands. Below we'll probe for support and | |
105 | # add elements to this list. | |
106 | set cmds {} | |
107 | ||
108 | foreach cmd {"watch" "awatch" "rwatch"} { | |
109 | set test $cmd | |
110 | gdb_test_multiple "$cmd buf.byte\[0\]" $test { | |
111 | -re "You may have requested too many.*$gdb_prompt $" { | |
112 | unsupported $test | |
113 | } | |
114 | -re "Target does not support.*$gdb_prompt $" { | |
115 | unsupported $test | |
116 | } | |
117 | -re "Can't set read/access watchpoint when hardware watchpoints are disabled.*$gdb_prompt $" { | |
118 | unsupported $test | |
119 | } | |
120 | -re "$gdb_prompt $" { | |
121 | pass $test | |
122 | lappend cmds $cmd | |
123 | } | |
124 | } | |
8e9db26e | 125 | |
3541979f AB |
126 | delete_breakpoints |
127 | } | |
8e9db26e | 128 | |
3541979f | 129 | set test "hbreak" |
e777225b | 130 | gdb_test_multiple "hbreak -q main" $test { |
8e9db26e PA |
131 | -re "You may have requested too many.*$gdb_prompt $" { |
132 | unsupported $test | |
133 | } | |
3541979f | 134 | -re "No hardware breakpoint support.*$gdb_prompt $" { |
aebf9d24 AA |
135 | unsupported $test |
136 | } | |
8e9db26e PA |
137 | -re "$gdb_prompt $" { |
138 | pass $test | |
3541979f | 139 | lappend cmds "hbreak" |
8e9db26e PA |
140 | } |
141 | } | |
142 | ||
3541979f | 143 | delete_breakpoints |
8e9db26e | 144 | |
3541979f | 145 | return $cmds |
8e9db26e PA |
146 | } |
147 | ||
ca5fd19b YQ |
148 | # Return true if the memory range [buf.byte + OFFSET, +WIDTH] can be |
149 | # monitored by CMD, otherwise return false. | |
150 | ||
151 | proc valid_addr_p {cmd offset width} { | |
152 | ||
153 | if { [istarget "aarch64*-*-linux*"] } { | |
154 | # The aarch64 Linux kernel port only accepts 4-byte aligned addresses | |
155 | # for hardware breakpoints and 8-byte aligned addresses for hardware | |
156 | # watchpoints. However, both GDB and GDBserver support unaligned | |
157 | # watchpoints by using more than one properly aligned watchpoint | |
158 | # registers to represent the whole unaligned region. Breakpoint | |
159 | # addresses must still be aligned though. | |
160 | if {$cmd == "hbreak" } { | |
161 | if { [expr ($offset) % 4] != 0 } { | |
162 | return 0 | |
163 | } | |
164 | } | |
de3db44c YQ |
165 | } elseif { [istarget "arm*-*-linux*"] } { |
166 | if { $cmd == "hbreak" } { | |
167 | # Breakpoints must be of length 2 (thumb) or 4 (ARM) bytes. | |
168 | if { $width != 2 && $width != 4 } { | |
169 | return 0 | |
170 | } | |
171 | } else { | |
172 | # Watchpoints can be of length 1, 2, 4 or 8 bytes. | |
173 | if { [expr $width % 2] != 0 } { | |
174 | return 0 | |
175 | } | |
176 | } | |
177 | ||
178 | if { [expr ($offset) % 8] == 0 && $width == 8 } { | |
179 | # If WIDTH is 8 byte, the address should be 8-byte aligned. | |
180 | return 1 | |
181 | } elseif { [expr ($offset) % 4] == 0 } { | |
182 | return 1 | |
183 | } elseif { [expr ($offset) % 4] == 2 && $width == 2 } { | |
184 | # Halfword watchpoints and breakpoints. | |
185 | return 1 | |
186 | } elseif { [expr ($offset) % 4] == 1 && $width == 1 && $cmd != "hbreak" } { | |
187 | # Single byte watchpoints. | |
188 | return 1 | |
189 | } else { | |
190 | return 0 | |
191 | } | |
ca5fd19b YQ |
192 | } |
193 | ||
194 | return 1 | |
195 | } | |
196 | ||
8e9db26e PA |
197 | # Watch WIDTH bytes at BASE + OFFSET. CMD specifices the specific |
198 | # type of watchpoint to use. If CMD is "hbreak", WIDTH is ignored. | |
3541979f AB |
199 | # The HW_WP_P flag tells us if hardware watchpoints are enabled or |
200 | # not. | |
8e9db26e | 201 | |
3541979f | 202 | proc watch_command {cmd base offset width hw_wp_p} { |
8e9db26e PA |
203 | global srcfile srcline hex |
204 | ||
205 | if {$cmd == "hbreak"} { | |
206 | set expr "*(buf.byte + $base + $offset)" | |
207 | gdb_test "hbreak $expr" "Hardware assisted breakpoint \[0-9\]+ at $hex" | |
208 | } elseif {$cmd == "watch"} { | |
209 | set expr "*(buf.byte + $base + $offset)@$width" | |
3541979f AB |
210 | |
211 | if { ! $hw_wp_p } { | |
212 | set wp_prefix "Watchpoint" | |
213 | } else { | |
214 | set wp_prefix "Hardware watchpoint" | |
215 | } | |
216 | ||
8e9db26e | 217 | gdb_test "$cmd $expr" \ |
3541979f | 218 | "${wp_prefix} \[0-9\]+: [string_to_regexp $expr]" |
8e9db26e PA |
219 | } elseif {$cmd == "awatch"} { |
220 | set expr "*(buf.byte + $base + $offset)@$width" | |
221 | gdb_test "$cmd $expr" \ | |
222 | "Hardware access \\(read/write\\) watchpoint \[0-9\]+: [string_to_regexp $expr]" | |
223 | } elseif {$cmd == "rwatch"} { | |
224 | set expr "*(buf.byte + $base + $offset)@$width" | |
225 | gdb_test "$cmd $expr" \ | |
226 | "Hardware read watchpoint \[0-9\]+: [string_to_regexp $expr]" | |
227 | } | |
228 | } | |
229 | ||
3541979f AB |
230 | # Run the watchpoint tests (see the description at the top for details), the |
231 | # HW_WP_P flag tells us if hardware watchpoints are enabled or not. | |
232 | proc run_watchpoints_tests {hw_wp_p} { | |
8e9db26e | 233 | |
3541979f | 234 | set cmds [build_cmds_list] |
8e9db26e | 235 | |
3541979f AB |
236 | foreach always_inserted {"off" "on" } { |
237 | gdb_test_no_output "set breakpoint always-inserted $always_inserted" | |
238 | foreach cmd1 $cmds { | |
239 | foreach cmd2 $cmds { | |
240 | for {set width 1} {$width < 4} {incr width} { | |
8e9db26e | 241 | |
3541979f AB |
242 | if {$cmd1 == "hbreak" && $cmd2 == "hbreak" \ |
243 | && $width > 1} { | |
244 | # hbreak ignores WIDTH, no use testing more than | |
245 | # once. | |
ca5fd19b YQ |
246 | continue |
247 | } | |
248 | ||
3541979f AB |
249 | for {set x 0} {$x < 4} {incr x} { |
250 | ||
251 | if { ![valid_addr_p $cmd1 $x $width] | |
252 | || ![valid_addr_p $cmd2 $x+1 $width] } { | |
253 | # Skip tests if requested address or length | |
254 | # of breakpoint or watchpoint don't meet | |
255 | # target or kernel requirements. | |
256 | continue | |
8e9db26e | 257 | } |
3541979f AB |
258 | |
259 | set prefix "always-inserted $always_inserted: " | |
260 | append prefix "$cmd1 x $cmd2: " | |
261 | with_test_prefix "$prefix: width $width, iter $x" { | |
262 | with_test_prefix "base + 0" { | |
263 | watch_command $cmd1 $x 0 $width $hw_wp_p | |
264 | stepi | |
265 | gdb_test_no_output "delete \$bpnum" | |
266 | } | |
267 | with_test_prefix "base + 1" { | |
268 | watch_command $cmd2 $x 1 $width $hw_wp_p | |
269 | stepi | |
270 | gdb_test_no_output "delete \$bpnum" | |
271 | } | |
8e9db26e PA |
272 | } |
273 | } | |
274 | } | |
275 | } | |
276 | } | |
277 | } | |
278 | } | |
3541979f AB |
279 | |
280 | # Based on HW_WP_P set whether hardware watchpoints can be used or | |
281 | # not, then call RUN_WATCHPOINTS_TESTS. | |
282 | proc setup_and_run_watchpoints_tests { hw_wp_p } { | |
283 | if {$hw_wp_p} { | |
284 | set prefix "hw-watch" | |
285 | } else { | |
286 | set prefix "sw-watch" | |
287 | } | |
288 | ||
289 | with_test_prefix $prefix { | |
290 | gdb_test_no_output "set can-use-hw-watchpoints ${hw_wp_p}" | |
291 | ||
292 | run_watchpoints_tests $hw_wp_p | |
293 | } | |
294 | } | |
295 | ||
296 | # Run tests with hardware watchpoints disabled, then again with them | |
297 | # enabled (if this target supports hardware watchpoints). | |
a47a2d45 | 298 | if { !$skip_hw_watchpoint_tests_p } { |
3541979f AB |
299 | # Run test with H/W enabled. |
300 | setup_and_run_watchpoints_tests 1 | |
301 | } | |
302 | ||
303 | # Run test with H/W disabled | |
304 | setup_and_run_watchpoints_tests 0 |