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Commit | Line | Data |
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5a6bef47 JO |
1 | /* |
2 | * Inspired by breakpoint overflow test done by | |
3 | * Vince Weaver <vincent.weaver@maine.edu> for perf_event_tests | |
4 | * (git://github.com/deater/perf_event_tests) | |
5 | */ | |
6 | ||
b3539d21 SB |
7 | /* |
8 | * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select | |
9 | * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. | |
10 | */ | |
11 | #define __SANE_USERSPACE_TYPES__ | |
12 | ||
5a6bef47 JO |
13 | #include <stdlib.h> |
14 | #include <stdio.h> | |
15 | #include <unistd.h> | |
16 | #include <string.h> | |
17 | #include <sys/ioctl.h> | |
18 | #include <time.h> | |
19 | #include <fcntl.h> | |
20 | #include <signal.h> | |
21 | #include <sys/mman.h> | |
22 | #include <linux/compiler.h> | |
23 | #include <linux/hw_breakpoint.h> | |
24 | ||
25 | #include "tests.h" | |
26 | #include "debug.h" | |
27 | #include "perf.h" | |
57480d2c | 28 | #include "cloexec.h" |
5a6bef47 JO |
29 | |
30 | static int fd1; | |
31 | static int fd2; | |
8fd34e1c | 32 | static int fd3; |
5a6bef47 | 33 | static int overflows; |
8fd34e1c WN |
34 | static int overflows_2; |
35 | ||
36 | volatile long the_var; | |
37 | ||
38 | ||
39 | /* | |
40 | * Use ASM to ensure watchpoint and breakpoint can be triggered | |
41 | * at one instruction. | |
42 | */ | |
43 | #if defined (__x86_64__) | |
44 | extern void __test_function(volatile long *ptr); | |
45 | asm ( | |
46 | ".globl __test_function\n" | |
47 | "__test_function:\n" | |
48 | "incq (%rdi)\n" | |
49 | "ret\n"); | |
50 | #elif defined (__aarch64__) | |
51 | extern void __test_function(volatile long *ptr); | |
52 | asm ( | |
53 | ".globl __test_function\n" | |
54 | "__test_function:\n" | |
55 | "str x30, [x0]\n" | |
56 | "ret\n"); | |
57 | ||
58 | #else | |
59 | static void __test_function(volatile long *ptr) | |
60 | { | |
61 | *ptr = 0x1234; | |
62 | } | |
63 | #endif | |
5a6bef47 JO |
64 | |
65 | __attribute__ ((noinline)) | |
66 | static int test_function(void) | |
67 | { | |
8fd34e1c WN |
68 | __test_function(&the_var); |
69 | the_var++; | |
5a6bef47 JO |
70 | return time(NULL); |
71 | } | |
72 | ||
8fd34e1c WN |
73 | static void sig_handler_2(int signum __maybe_unused, |
74 | siginfo_t *oh __maybe_unused, | |
75 | void *uc __maybe_unused) | |
76 | { | |
77 | overflows_2++; | |
78 | if (overflows_2 > 10) { | |
79 | ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); | |
80 | ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); | |
81 | ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); | |
82 | } | |
83 | } | |
84 | ||
5a6bef47 JO |
85 | static void sig_handler(int signum __maybe_unused, |
86 | siginfo_t *oh __maybe_unused, | |
87 | void *uc __maybe_unused) | |
88 | { | |
89 | overflows++; | |
90 | ||
91 | if (overflows > 10) { | |
92 | /* | |
93 | * This should be executed only once during | |
94 | * this test, if we are here for the 10th | |
95 | * time, consider this the recursive issue. | |
96 | * | |
97 | * We can get out of here by disable events, | |
98 | * so no new SIGIO is delivered. | |
99 | */ | |
100 | ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); | |
101 | ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); | |
8fd34e1c | 102 | ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); |
5a6bef47 JO |
103 | } |
104 | } | |
105 | ||
1ad826ba | 106 | static int __event(bool is_x, void *addr, int sig) |
5a6bef47 JO |
107 | { |
108 | struct perf_event_attr pe; | |
109 | int fd; | |
110 | ||
111 | memset(&pe, 0, sizeof(struct perf_event_attr)); | |
112 | pe.type = PERF_TYPE_BREAKPOINT; | |
113 | pe.size = sizeof(struct perf_event_attr); | |
114 | ||
115 | pe.config = 0; | |
8fd34e1c WN |
116 | pe.bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W; |
117 | pe.bp_addr = (unsigned long) addr; | |
5a6bef47 JO |
118 | pe.bp_len = sizeof(long); |
119 | ||
120 | pe.sample_period = 1; | |
121 | pe.sample_type = PERF_SAMPLE_IP; | |
122 | pe.wakeup_events = 1; | |
123 | ||
124 | pe.disabled = 1; | |
125 | pe.exclude_kernel = 1; | |
126 | pe.exclude_hv = 1; | |
127 | ||
57480d2c YD |
128 | fd = sys_perf_event_open(&pe, 0, -1, -1, |
129 | perf_event_open_cloexec_flag()); | |
5a6bef47 JO |
130 | if (fd < 0) { |
131 | pr_debug("failed opening event %llx\n", pe.config); | |
132 | return TEST_FAIL; | |
133 | } | |
134 | ||
8fd34e1c | 135 | fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); |
1ad826ba | 136 | fcntl(fd, F_SETSIG, sig); |
8fd34e1c | 137 | fcntl(fd, F_SETOWN, getpid()); |
5a6bef47 JO |
138 | |
139 | ioctl(fd, PERF_EVENT_IOC_RESET, 0); | |
140 | ||
141 | return fd; | |
142 | } | |
143 | ||
1ad826ba | 144 | static int bp_event(void *addr, int sig) |
8fd34e1c | 145 | { |
1ad826ba | 146 | return __event(true, addr, sig); |
8fd34e1c WN |
147 | } |
148 | ||
1ad826ba | 149 | static int wp_event(void *addr, int sig) |
8fd34e1c | 150 | { |
1ad826ba | 151 | return __event(false, addr, sig); |
8fd34e1c WN |
152 | } |
153 | ||
5a6bef47 JO |
154 | static long long bp_count(int fd) |
155 | { | |
156 | long long count; | |
157 | int ret; | |
158 | ||
159 | ret = read(fd, &count, sizeof(long long)); | |
160 | if (ret != sizeof(long long)) { | |
161 | pr_debug("failed to read: %d\n", ret); | |
162 | return TEST_FAIL; | |
163 | } | |
164 | ||
165 | return count; | |
166 | } | |
167 | ||
721a1f53 | 168 | int test__bp_signal(int subtest __maybe_unused) |
5a6bef47 JO |
169 | { |
170 | struct sigaction sa; | |
8fd34e1c | 171 | long long count1, count2, count3; |
5a6bef47 JO |
172 | |
173 | /* setup SIGIO signal handler */ | |
174 | memset(&sa, 0, sizeof(struct sigaction)); | |
175 | sa.sa_sigaction = (void *) sig_handler; | |
176 | sa.sa_flags = SA_SIGINFO; | |
177 | ||
178 | if (sigaction(SIGIO, &sa, NULL) < 0) { | |
179 | pr_debug("failed setting up signal handler\n"); | |
180 | return TEST_FAIL; | |
181 | } | |
182 | ||
8fd34e1c WN |
183 | sa.sa_sigaction = (void *) sig_handler_2; |
184 | if (sigaction(SIGUSR1, &sa, NULL) < 0) { | |
185 | pr_debug("failed setting up signal handler 2\n"); | |
186 | return TEST_FAIL; | |
187 | } | |
188 | ||
5a6bef47 JO |
189 | /* |
190 | * We create following events: | |
191 | * | |
8fd34e1c | 192 | * fd1 - breakpoint event on __test_function with SIGIO |
5a6bef47 JO |
193 | * signal configured. We should get signal |
194 | * notification each time the breakpoint is hit | |
195 | * | |
8fd34e1c WN |
196 | * fd2 - breakpoint event on sig_handler with SIGUSR1 |
197 | * configured. We should get SIGUSR1 each time when | |
198 | * breakpoint is hit | |
199 | * | |
200 | * fd3 - watchpoint event on __test_function with SIGIO | |
5a6bef47 JO |
201 | * configured. |
202 | * | |
203 | * Following processing should happen: | |
8fd34e1c WN |
204 | * Exec: Action: Result: |
205 | * incq (%rdi) - fd1 event breakpoint hit -> count1 == 1 | |
206 | * - SIGIO is delivered | |
207 | * sig_handler - fd2 event breakpoint hit -> count2 == 1 | |
208 | * - SIGUSR1 is delivered | |
209 | * sig_handler_2 -> overflows_2 == 1 (nested signal) | |
210 | * sys_rt_sigreturn - return from sig_handler_2 | |
211 | * overflows++ -> overflows = 1 | |
212 | * sys_rt_sigreturn - return from sig_handler | |
213 | * incq (%rdi) - fd3 event watchpoint hit -> count3 == 1 (wp and bp in one insn) | |
214 | * - SIGIO is delivered | |
215 | * sig_handler - fd2 event breakpoint hit -> count2 == 2 | |
216 | * - SIGUSR1 is delivered | |
217 | * sig_handler_2 -> overflows_2 == 2 (nested signal) | |
218 | * sys_rt_sigreturn - return from sig_handler_2 | |
219 | * overflows++ -> overflows = 2 | |
220 | * sys_rt_sigreturn - return from sig_handler | |
221 | * the_var++ - fd3 event watchpoint hit -> count3 == 2 (standalone watchpoint) | |
222 | * - SIGIO is delivered | |
223 | * sig_handler - fd2 event breakpoint hit -> count2 == 3 | |
224 | * - SIGUSR1 is delivered | |
225 | * sig_handler_2 -> overflows_2 == 3 (nested signal) | |
226 | * sys_rt_sigreturn - return from sig_handler_2 | |
227 | * overflows++ -> overflows == 3 | |
228 | * sys_rt_sigreturn - return from sig_handler | |
5a6bef47 JO |
229 | * |
230 | * The test case check following error conditions: | |
231 | * - we get stuck in signal handler because of debug | |
232 | * exception being triggered receursively due to | |
233 | * the wrong RF EFLAG management | |
234 | * | |
235 | * - we never trigger the sig_handler breakpoint due | |
236 | * to the rong RF EFLAG management | |
237 | * | |
238 | */ | |
239 | ||
8fd34e1c WN |
240 | fd1 = bp_event(__test_function, SIGIO); |
241 | fd2 = bp_event(sig_handler, SIGUSR1); | |
242 | fd3 = wp_event((void *)&the_var, SIGIO); | |
5a6bef47 JO |
243 | |
244 | ioctl(fd1, PERF_EVENT_IOC_ENABLE, 0); | |
245 | ioctl(fd2, PERF_EVENT_IOC_ENABLE, 0); | |
8fd34e1c | 246 | ioctl(fd3, PERF_EVENT_IOC_ENABLE, 0); |
5a6bef47 JO |
247 | |
248 | /* | |
249 | * Kick off the test by trigering 'fd1' | |
250 | * breakpoint. | |
251 | */ | |
252 | test_function(); | |
253 | ||
254 | ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); | |
255 | ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); | |
8fd34e1c | 256 | ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); |
5a6bef47 JO |
257 | |
258 | count1 = bp_count(fd1); | |
259 | count2 = bp_count(fd2); | |
8fd34e1c | 260 | count3 = bp_count(fd3); |
5a6bef47 JO |
261 | |
262 | close(fd1); | |
263 | close(fd2); | |
8fd34e1c | 264 | close(fd3); |
5a6bef47 | 265 | |
8fd34e1c WN |
266 | pr_debug("count1 %lld, count2 %lld, count3 %lld, overflow %d, overflows_2 %d\n", |
267 | count1, count2, count3, overflows, overflows_2); | |
5a6bef47 JO |
268 | |
269 | if (count1 != 1) { | |
270 | if (count1 == 11) | |
271 | pr_debug("failed: RF EFLAG recursion issue detected\n"); | |
272 | else | |
273 | pr_debug("failed: wrong count for bp1%lld\n", count1); | |
274 | } | |
275 | ||
8fd34e1c | 276 | if (overflows != 3) |
5a6bef47 JO |
277 | pr_debug("failed: wrong overflow hit\n"); |
278 | ||
8fd34e1c WN |
279 | if (overflows_2 != 3) |
280 | pr_debug("failed: wrong overflow_2 hit\n"); | |
281 | ||
282 | if (count2 != 3) | |
5a6bef47 JO |
283 | pr_debug("failed: wrong count for bp2\n"); |
284 | ||
8fd34e1c WN |
285 | if (count3 != 2) |
286 | pr_debug("failed: wrong count for bp3\n"); | |
287 | ||
288 | return count1 == 1 && overflows == 3 && count2 == 3 && overflows_2 == 3 && count3 == 2 ? | |
5a6bef47 JO |
289 | TEST_OK : TEST_FAIL; |
290 | } | |
598762cf JO |
291 | |
292 | bool test__bp_signal_is_supported(void) | |
293 | { | |
294 | /* | |
295 | * The powerpc so far does not have support to even create | |
296 | * instruction breakpoint using the perf event interface. | |
297 | * Once it's there we can release this. | |
298 | */ | |
299 | #ifdef __powerpc__ | |
300 | return false; | |
301 | #else | |
302 | return true; | |
303 | #endif | |
304 | } |