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e2882c85 | 1 | # Copyright 2014-2018 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 | ||
8e9db26e PA |
25 | standard_testfile |
26 | ||
27 | if {[prepare_for_testing "failed to prepare" $testfile $srcfile debug]} { | |
28 | return -1 | |
29 | } | |
30 | ||
31 | if ![runto_main] then { | |
bc6c7af4 | 32 | fail "can't run to main" |
8e9db26e PA |
33 | return 0 |
34 | } | |
35 | ||
36 | # The line we'll be stepping. | |
37 | set srcline [gdb_get_line_number "stepi line"] | |
38 | ||
39 | # The address the program is stopped at currently. | |
40 | set cur_addr "" | |
41 | ||
42 | # Get the current PC. | |
43 | ||
44 | proc get_pc {} { | |
45 | global hex gdb_prompt | |
46 | ||
47 | set addr "" | |
48 | set test "get PC" | |
49 | gdb_test_multiple "p /x \$pc" "$test" { | |
50 | -re " = ($hex).*$gdb_prompt $" { | |
51 | set addr $expect_out(1,string) | |
52 | pass "$test" | |
53 | } | |
54 | } | |
55 | ||
56 | return $addr | |
57 | } | |
58 | ||
59 | ||
60 | # Issue a stepi, and make sure the program advanced past the current | |
61 | # instruction (stored in the CUR_ADDR global). | |
62 | ||
63 | proc stepi {} { | |
64 | global hex gdb_prompt cur_addr | |
65 | ||
66 | set srcline " for (i = 0; i < 100000; i++); /* stepi line */" | |
67 | set test "stepi advanced" | |
68 | gdb_test_multiple "stepi" $test { | |
69 | -re "($hex).*[string_to_regexp $srcline]\r\n$gdb_prompt $" { | |
70 | set addr $expect_out(1,string) | |
71 | if {$addr != $cur_addr} { | |
72 | pass $test | |
73 | } else { | |
74 | fail $test | |
75 | } | |
76 | set cur_addr addr | |
77 | } | |
78 | } | |
79 | } | |
80 | ||
81 | gdb_breakpoint $srcline | |
82 | gdb_continue_to_breakpoint "stepi line" | |
3541979f | 83 | set cur_addr [get_pc] |
8e9db26e PA |
84 | |
85 | # The test tries various sequences of different types of watchpoints. | |
86 | # Probe for support first. | |
3541979f AB |
87 | proc build_cmds_list {} { |
88 | global gdb_prompt | |
89 | ||
90 | # So we get an immediate warning/error if the target doesn't support a | |
91 | # given watchpoint type. | |
92 | gdb_test_no_output "set breakpoint always-inserted on" \ | |
93 | "Set breakpoints always inserted while building cmds list" | |
94 | ||
95 | # The list of supported commands. Below we'll probe for support and | |
96 | # add elements to this list. | |
97 | set cmds {} | |
98 | ||
99 | foreach cmd {"watch" "awatch" "rwatch"} { | |
100 | set test $cmd | |
101 | gdb_test_multiple "$cmd buf.byte\[0\]" $test { | |
102 | -re "You may have requested too many.*$gdb_prompt $" { | |
103 | unsupported $test | |
104 | } | |
105 | -re "Target does not support.*$gdb_prompt $" { | |
106 | unsupported $test | |
107 | } | |
108 | -re "Can't set read/access watchpoint when hardware watchpoints are disabled.*$gdb_prompt $" { | |
109 | unsupported $test | |
110 | } | |
111 | -re "$gdb_prompt $" { | |
112 | pass $test | |
113 | lappend cmds $cmd | |
114 | } | |
115 | } | |
8e9db26e | 116 | |
3541979f AB |
117 | delete_breakpoints |
118 | } | |
8e9db26e | 119 | |
3541979f AB |
120 | set test "hbreak" |
121 | gdb_test_multiple "hbreak main" $test { | |
8e9db26e PA |
122 | -re "You may have requested too many.*$gdb_prompt $" { |
123 | unsupported $test | |
124 | } | |
3541979f | 125 | -re "No hardware breakpoint support.*$gdb_prompt $" { |
aebf9d24 AA |
126 | unsupported $test |
127 | } | |
8e9db26e PA |
128 | -re "$gdb_prompt $" { |
129 | pass $test | |
3541979f | 130 | lappend cmds "hbreak" |
8e9db26e PA |
131 | } |
132 | } | |
133 | ||
3541979f | 134 | delete_breakpoints |
8e9db26e | 135 | |
3541979f | 136 | return $cmds |
8e9db26e PA |
137 | } |
138 | ||
ca5fd19b YQ |
139 | # Return true if the memory range [buf.byte + OFFSET, +WIDTH] can be |
140 | # monitored by CMD, otherwise return false. | |
141 | ||
142 | proc valid_addr_p {cmd offset width} { | |
143 | ||
144 | if { [istarget "aarch64*-*-linux*"] } { | |
145 | # The aarch64 Linux kernel port only accepts 4-byte aligned addresses | |
146 | # for hardware breakpoints and 8-byte aligned addresses for hardware | |
147 | # watchpoints. However, both GDB and GDBserver support unaligned | |
148 | # watchpoints by using more than one properly aligned watchpoint | |
149 | # registers to represent the whole unaligned region. Breakpoint | |
150 | # addresses must still be aligned though. | |
151 | if {$cmd == "hbreak" } { | |
152 | if { [expr ($offset) % 4] != 0 } { | |
153 | return 0 | |
154 | } | |
155 | } | |
de3db44c YQ |
156 | } elseif { [istarget "arm*-*-linux*"] } { |
157 | if { $cmd == "hbreak" } { | |
158 | # Breakpoints must be of length 2 (thumb) or 4 (ARM) bytes. | |
159 | if { $width != 2 && $width != 4 } { | |
160 | return 0 | |
161 | } | |
162 | } else { | |
163 | # Watchpoints can be of length 1, 2, 4 or 8 bytes. | |
164 | if { [expr $width % 2] != 0 } { | |
165 | return 0 | |
166 | } | |
167 | } | |
168 | ||
169 | if { [expr ($offset) % 8] == 0 && $width == 8 } { | |
170 | # If WIDTH is 8 byte, the address should be 8-byte aligned. | |
171 | return 1 | |
172 | } elseif { [expr ($offset) % 4] == 0 } { | |
173 | return 1 | |
174 | } elseif { [expr ($offset) % 4] == 2 && $width == 2 } { | |
175 | # Halfword watchpoints and breakpoints. | |
176 | return 1 | |
177 | } elseif { [expr ($offset) % 4] == 1 && $width == 1 && $cmd != "hbreak" } { | |
178 | # Single byte watchpoints. | |
179 | return 1 | |
180 | } else { | |
181 | return 0 | |
182 | } | |
ca5fd19b YQ |
183 | } |
184 | ||
185 | return 1 | |
186 | } | |
187 | ||
8e9db26e PA |
188 | # Watch WIDTH bytes at BASE + OFFSET. CMD specifices the specific |
189 | # type of watchpoint to use. If CMD is "hbreak", WIDTH is ignored. | |
3541979f AB |
190 | # The HW_WP_P flag tells us if hardware watchpoints are enabled or |
191 | # not. | |
8e9db26e | 192 | |
3541979f | 193 | proc watch_command {cmd base offset width hw_wp_p} { |
8e9db26e PA |
194 | global srcfile srcline hex |
195 | ||
196 | if {$cmd == "hbreak"} { | |
197 | set expr "*(buf.byte + $base + $offset)" | |
198 | gdb_test "hbreak $expr" "Hardware assisted breakpoint \[0-9\]+ at $hex" | |
199 | } elseif {$cmd == "watch"} { | |
200 | set expr "*(buf.byte + $base + $offset)@$width" | |
3541979f AB |
201 | |
202 | if { ! $hw_wp_p } { | |
203 | set wp_prefix "Watchpoint" | |
204 | } else { | |
205 | set wp_prefix "Hardware watchpoint" | |
206 | } | |
207 | ||
8e9db26e | 208 | gdb_test "$cmd $expr" \ |
3541979f | 209 | "${wp_prefix} \[0-9\]+: [string_to_regexp $expr]" |
8e9db26e PA |
210 | } elseif {$cmd == "awatch"} { |
211 | set expr "*(buf.byte + $base + $offset)@$width" | |
212 | gdb_test "$cmd $expr" \ | |
213 | "Hardware access \\(read/write\\) watchpoint \[0-9\]+: [string_to_regexp $expr]" | |
214 | } elseif {$cmd == "rwatch"} { | |
215 | set expr "*(buf.byte + $base + $offset)@$width" | |
216 | gdb_test "$cmd $expr" \ | |
217 | "Hardware read watchpoint \[0-9\]+: [string_to_regexp $expr]" | |
218 | } | |
219 | } | |
220 | ||
3541979f AB |
221 | # Run the watchpoint tests (see the description at the top for details), the |
222 | # HW_WP_P flag tells us if hardware watchpoints are enabled or not. | |
223 | proc run_watchpoints_tests {hw_wp_p} { | |
8e9db26e | 224 | |
3541979f | 225 | set cmds [build_cmds_list] |
8e9db26e | 226 | |
3541979f AB |
227 | foreach always_inserted {"off" "on" } { |
228 | gdb_test_no_output "set breakpoint always-inserted $always_inserted" | |
229 | foreach cmd1 $cmds { | |
230 | foreach cmd2 $cmds { | |
231 | for {set width 1} {$width < 4} {incr width} { | |
8e9db26e | 232 | |
3541979f AB |
233 | if {$cmd1 == "hbreak" && $cmd2 == "hbreak" \ |
234 | && $width > 1} { | |
235 | # hbreak ignores WIDTH, no use testing more than | |
236 | # once. | |
ca5fd19b YQ |
237 | continue |
238 | } | |
239 | ||
3541979f AB |
240 | for {set x 0} {$x < 4} {incr x} { |
241 | ||
242 | if { ![valid_addr_p $cmd1 $x $width] | |
243 | || ![valid_addr_p $cmd2 $x+1 $width] } { | |
244 | # Skip tests if requested address or length | |
245 | # of breakpoint or watchpoint don't meet | |
246 | # target or kernel requirements. | |
247 | continue | |
8e9db26e | 248 | } |
3541979f AB |
249 | |
250 | set prefix "always-inserted $always_inserted: " | |
251 | append prefix "$cmd1 x $cmd2: " | |
252 | with_test_prefix "$prefix: width $width, iter $x" { | |
253 | with_test_prefix "base + 0" { | |
254 | watch_command $cmd1 $x 0 $width $hw_wp_p | |
255 | stepi | |
256 | gdb_test_no_output "delete \$bpnum" | |
257 | } | |
258 | with_test_prefix "base + 1" { | |
259 | watch_command $cmd2 $x 1 $width $hw_wp_p | |
260 | stepi | |
261 | gdb_test_no_output "delete \$bpnum" | |
262 | } | |
8e9db26e PA |
263 | } |
264 | } | |
265 | } | |
266 | } | |
267 | } | |
268 | } | |
269 | } | |
3541979f AB |
270 | |
271 | # Based on HW_WP_P set whether hardware watchpoints can be used or | |
272 | # not, then call RUN_WATCHPOINTS_TESTS. | |
273 | proc setup_and_run_watchpoints_tests { hw_wp_p } { | |
274 | if {$hw_wp_p} { | |
275 | set prefix "hw-watch" | |
276 | } else { | |
277 | set prefix "sw-watch" | |
278 | } | |
279 | ||
280 | with_test_prefix $prefix { | |
281 | gdb_test_no_output "set can-use-hw-watchpoints ${hw_wp_p}" | |
282 | ||
283 | run_watchpoints_tests $hw_wp_p | |
284 | } | |
285 | } | |
286 | ||
287 | # Run tests with hardware watchpoints disabled, then again with them | |
288 | # enabled (if this target supports hardware watchpoints). | |
289 | if { ![target_info exists gdb,no_hardware_watchpoints]} { | |
290 | # Run test with H/W enabled. | |
291 | setup_and_run_watchpoints_tests 1 | |
292 | } | |
293 | ||
294 | # Run test with H/W disabled | |
295 | setup_and_run_watchpoints_tests 0 |