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1// SPDX-License-Identifier: GPL-2.0
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <sys/ioctl.h>
6#include <linux/hw_breakpoint.h>
7#include <linux/kernel.h>
8#include "tests.h"
9#include "debug.h"
10#include "event.h"
11#include "cloexec.h"
12#include "../perf-sys.h"
13
14#define WP_TEST_ASSERT_VAL(fd, text, val) \
15do { \
16 long long count; \
17 wp_read(fd, &count, sizeof(long long)); \
18 TEST_ASSERT_VAL(text, count == val); \
19} while (0)
20
21volatile u64 data1;
22volatile u8 data2[3];
23
24static int wp_read(int fd, long long *count, int size)
25{
26 int ret = read(fd, count, size);
27
28 if (ret != size) {
29 pr_debug("failed to read: %d\n", ret);
30 return -1;
31 }
32 return 0;
33}
34
35static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
36 void *wp_addr, unsigned long wp_len)
37{
38 memset(attr, 0, sizeof(struct perf_event_attr));
39 attr->type = PERF_TYPE_BREAKPOINT;
40 attr->size = sizeof(struct perf_event_attr);
41 attr->config = 0;
42 attr->bp_type = wp_type;
43 attr->bp_addr = (unsigned long)wp_addr;
44 attr->bp_len = wp_len;
45 attr->sample_period = 1;
46 attr->sample_type = PERF_SAMPLE_IP;
47 attr->exclude_kernel = 1;
48 attr->exclude_hv = 1;
49}
50
51static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
52{
53 int fd;
54 struct perf_event_attr attr;
55
56 get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
57 fd = sys_perf_event_open(&attr, 0, -1, -1,
58 perf_event_open_cloexec_flag());
59 if (fd < 0)
60 pr_debug("failed opening event %x\n", attr.bp_type);
61
62 return fd;
63}
64
65static int wp_ro_test(void)
66{
67 int fd;
68 unsigned long tmp, tmp1 = rand();
69
70 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
71 if (fd < 0)
72 return -1;
73
74 tmp = data1;
75 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
76
77 data1 = tmp1 + tmp;
78 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
79
80 close(fd);
81 return 0;
82}
83
84static int wp_wo_test(void)
85{
86 int fd;
87 unsigned long tmp, tmp1 = rand();
88
89 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
90 if (fd < 0)
91 return -1;
92
93 tmp = data1;
94 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
95
96 data1 = tmp1 + tmp;
97 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
98
99 close(fd);
100 return 0;
101}
102
103static int wp_rw_test(void)
104{
105 int fd;
106 unsigned long tmp, tmp1 = rand();
107
108 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
109 sizeof(data1));
110 if (fd < 0)
111 return -1;
112
113 tmp = data1;
114 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
115
116 data1 = tmp1 + tmp;
117 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
118
119 close(fd);
120 return 0;
121}
122
123static int wp_modify_test(void)
124{
125 int fd, ret;
126 unsigned long tmp = rand();
127 struct perf_event_attr new_attr;
128
129 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
130 if (fd < 0)
131 return -1;
132
133 data1 = tmp;
134 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
135
136 /* Modify watchpoint with disabled = 1 */
137 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
138 sizeof(u8) * 2);
139 new_attr.disabled = 1;
140 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
141 if (ret < 0) {
142 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
143 close(fd);
144 return ret;
145 }
146
147 data2[1] = tmp; /* Not Counted */
148 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
149
150 /* Enable the event */
151 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
152 if (ret < 0) {
153 pr_debug("Failed to enable event\n");
154 close(fd);
155 return ret;
156 }
157
158 data2[1] = tmp; /* Counted */
159 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
160
161 data2[2] = tmp; /* Not Counted */
162 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
163
164 close(fd);
165 return 0;
166}
167
168static bool wp_ro_supported(void)
169{
170#if defined (__x86_64__) || defined (__i386__)
171 return false;
172#else
173 return true;
174#endif
175}
176
177static void wp_ro_skip_msg(void)
178{
179#if defined (__x86_64__) || defined (__i386__)
180 pr_debug("Hardware does not support read only watchpoints.\n");
181#endif
182}
183
184static struct {
185 const char *desc;
186 int (*target_func)(void);
187 bool (*is_supported)(void);
188 void (*skip_msg)(void);
189} wp_testcase_table[] = {
190 {
191 .desc = "Read Only Watchpoint",
192 .target_func = &wp_ro_test,
193 .is_supported = &wp_ro_supported,
194 .skip_msg = &wp_ro_skip_msg,
195 },
196 {
197 .desc = "Write Only Watchpoint",
198 .target_func = &wp_wo_test,
199 },
200 {
201 .desc = "Read / Write Watchpoint",
202 .target_func = &wp_rw_test,
203 },
204 {
205 .desc = "Modify Watchpoint",
206 .target_func = &wp_modify_test,
207 },
208};
209
210int test__wp_subtest_get_nr(void)
211{
212 return (int)ARRAY_SIZE(wp_testcase_table);
213}
214
215const char *test__wp_subtest_get_desc(int i)
216{
217 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
218 return NULL;
219 return wp_testcase_table[i].desc;
220}
221
222int test__wp(struct test *test __maybe_unused, int i)
223{
224 if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
225 return TEST_FAIL;
226
227 if (wp_testcase_table[i].is_supported &&
228 !wp_testcase_table[i].is_supported()) {
229 wp_testcase_table[i].skip_msg();
230 return TEST_SKIP;
231 }
232
233 return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
234}
235
236/* The s390 so far does not have support for
237 * instruction breakpoint using the perf_event_open() system call.
238 */
239bool test__wp_is_supported(void)
240{
241#if defined(__s390x__)
242 return false;
243#else
244 return true;
245#endif
246}
1// SPDX-License-Identifier: GPL-2.0
2#include <stdlib.h>
3#include <string.h>
4#include <unistd.h>
5#include <errno.h>
6#include <sys/ioctl.h>
7#include <linux/compiler.h>
8#include <linux/hw_breakpoint.h>
9#include <linux/kernel.h>
10#include "tests.h"
11#include "debug.h"
12#include "event.h"
13#include "cloexec.h"
14#include "../perf-sys.h"
15
16#define WP_TEST_ASSERT_VAL(fd, text, val) \
17do { \
18 long long count; \
19 wp_read(fd, &count, sizeof(long long)); \
20 TEST_ASSERT_VAL(text, count == val); \
21} while (0)
22
23#ifdef __i386__
24/* Only breakpoint length less-than 8 has hardware support on i386. */
25volatile u32 data1;
26#else
27volatile u64 data1;
28#endif
29volatile u8 data2[3];
30
31#ifndef __s390x__
32static int wp_read(int fd, long long *count, int size)
33{
34 int ret = read(fd, count, size);
35
36 if (ret != size) {
37 pr_debug("failed to read: %d\n", ret);
38 return -1;
39 }
40 return 0;
41}
42
43static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
44 void *wp_addr, unsigned long wp_len)
45{
46 memset(attr, 0, sizeof(struct perf_event_attr));
47 attr->type = PERF_TYPE_BREAKPOINT;
48 attr->size = sizeof(struct perf_event_attr);
49 attr->config = 0;
50 attr->bp_type = wp_type;
51 attr->bp_addr = (unsigned long)wp_addr;
52 attr->bp_len = wp_len;
53 attr->sample_period = 1;
54 attr->sample_type = PERF_SAMPLE_IP;
55 attr->exclude_kernel = 1;
56 attr->exclude_hv = 1;
57}
58
59static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
60{
61 int fd;
62 struct perf_event_attr attr;
63
64 get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
65 fd = sys_perf_event_open(&attr, 0, -1, -1,
66 perf_event_open_cloexec_flag());
67 if (fd < 0) {
68 fd = -errno;
69 pr_debug("failed opening event %x\n", attr.bp_type);
70 }
71
72 return fd;
73}
74#endif
75
76static int test__wp_ro(struct test_suite *test __maybe_unused,
77 int subtest __maybe_unused)
78{
79#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)
80 return TEST_SKIP;
81#else
82 int fd;
83 unsigned long tmp, tmp1 = rand();
84
85 fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
86 if (fd < 0)
87 return fd == -ENODEV ? TEST_SKIP : -1;
88
89 tmp = data1;
90 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
91
92 data1 = tmp1 + tmp;
93 WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
94
95 close(fd);
96 return 0;
97#endif
98}
99
100static int test__wp_wo(struct test_suite *test __maybe_unused,
101 int subtest __maybe_unused)
102{
103#if defined(__s390x__)
104 return TEST_SKIP;
105#else
106 int fd;
107 unsigned long tmp, tmp1 = rand();
108
109 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
110 if (fd < 0)
111 return fd == -ENODEV ? TEST_SKIP : -1;
112
113 tmp = data1;
114 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
115
116 data1 = tmp1 + tmp;
117 WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
118
119 close(fd);
120 return 0;
121#endif
122}
123
124static int test__wp_rw(struct test_suite *test __maybe_unused,
125 int subtest __maybe_unused)
126{
127#if defined(__s390x__)
128 return TEST_SKIP;
129#else
130 int fd;
131 unsigned long tmp, tmp1 = rand();
132
133 fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
134 sizeof(data1));
135 if (fd < 0)
136 return fd == -ENODEV ? TEST_SKIP : -1;
137
138 tmp = data1;
139 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
140
141 data1 = tmp1 + tmp;
142 WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
143
144 close(fd);
145 return 0;
146#endif
147}
148
149static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
150{
151#if defined(__s390x__)
152 return TEST_SKIP;
153#else
154 int fd, ret;
155 unsigned long tmp = rand();
156 struct perf_event_attr new_attr;
157
158 fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
159 if (fd < 0)
160 return fd == -ENODEV ? TEST_SKIP : -1;
161
162 data1 = tmp;
163 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
164
165 /* Modify watchpoint with disabled = 1 */
166 get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
167 sizeof(u8) * 2);
168 new_attr.disabled = 1;
169 ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
170 if (ret < 0) {
171 if (errno == ENOTTY) {
172 test->test_cases[subtest].skip_reason = "missing kernel support";
173 ret = TEST_SKIP;
174 }
175
176 pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
177 close(fd);
178 return ret;
179 }
180
181 data2[1] = tmp; /* Not Counted */
182 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
183
184 /* Enable the event */
185 ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
186 if (ret < 0) {
187 pr_debug("Failed to enable event\n");
188 close(fd);
189 return ret;
190 }
191
192 data2[1] = tmp; /* Counted */
193 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
194
195 data2[2] = tmp; /* Not Counted */
196 WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
197
198 close(fd);
199 return 0;
200#endif
201}
202
203static struct test_case wp_tests[] = {
204 TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"),
205 TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"),
206 TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"),
207 TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"),
208 { .name = NULL, }
209};
210
211struct test_suite suite__wp = {
212 .desc = "Watchpoint",
213 .test_cases = wp_tests,
214};