1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
// SPDX-License-Identifier: GPL-2.0
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/hw_breakpoint.h>
#include <linux/kernel.h>
#include "tests.h"
#include "debug.h"
#include "event.h"
#include "cloexec.h"
#include "../perf-sys.h"
#define WP_TEST_ASSERT_VAL(fd, text, val) \
do { \
long long count; \
wp_read(fd, &count, sizeof(long long)); \
TEST_ASSERT_VAL(text, count == val); \
} while (0)
volatile u64 data1;
volatile u8 data2[3];
#ifndef __s390x__
static int wp_read(int fd, long long *count, int size)
{
int ret = read(fd, count, size);
if (ret != size) {
pr_debug("failed to read: %d\n", ret);
return -1;
}
return 0;
}
static void get__perf_event_attr(struct perf_event_attr *attr, int wp_type,
void *wp_addr, unsigned long wp_len)
{
memset(attr, 0, sizeof(struct perf_event_attr));
attr->type = PERF_TYPE_BREAKPOINT;
attr->size = sizeof(struct perf_event_attr);
attr->config = 0;
attr->bp_type = wp_type;
attr->bp_addr = (unsigned long)wp_addr;
attr->bp_len = wp_len;
attr->sample_period = 1;
attr->sample_type = PERF_SAMPLE_IP;
attr->exclude_kernel = 1;
attr->exclude_hv = 1;
}
static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
{
int fd;
struct perf_event_attr attr;
get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
fd = sys_perf_event_open(&attr, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0)
pr_debug("failed opening event %x\n", attr.bp_type);
return fd;
}
#endif
static int test__wp_ro(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
#if defined(__s390x__) || defined(__x86_64__) || defined(__i386__)
return TEST_SKIP;
#else
int fd;
unsigned long tmp, tmp1 = rand();
fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
if (fd < 0)
return -1;
tmp = data1;
WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
data1 = tmp1 + tmp;
WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
close(fd);
return 0;
#endif
}
static int test__wp_wo(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
#if defined(__s390x__)
return TEST_SKIP;
#else
int fd;
unsigned long tmp, tmp1 = rand();
fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
if (fd < 0)
return -1;
tmp = data1;
WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
data1 = tmp1 + tmp;
WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 1);
close(fd);
return 0;
#endif
}
static int test__wp_rw(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
#if defined(__s390x__)
return TEST_SKIP;
#else
int fd;
unsigned long tmp, tmp1 = rand();
fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
sizeof(data1));
if (fd < 0)
return -1;
tmp = data1;
WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
data1 = tmp1 + tmp;
WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 2);
close(fd);
return 0;
#endif
}
static int test__wp_modify(struct test_suite *test __maybe_unused,
int subtest __maybe_unused)
{
#if defined(__s390x__)
return TEST_SKIP;
#else
int fd, ret;
unsigned long tmp = rand();
struct perf_event_attr new_attr;
fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
if (fd < 0)
return -1;
data1 = tmp;
WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
/* Modify watchpoint with disabled = 1 */
get__perf_event_attr(&new_attr, HW_BREAKPOINT_W, (void *)&data2[0],
sizeof(u8) * 2);
new_attr.disabled = 1;
ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &new_attr);
if (ret < 0) {
pr_debug("ioctl(PERF_EVENT_IOC_MODIFY_ATTRIBUTES) failed\n");
close(fd);
return ret;
}
data2[1] = tmp; /* Not Counted */
WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
/* Enable the event */
ioctl(fd, PERF_EVENT_IOC_ENABLE, 0);
if (ret < 0) {
pr_debug("Failed to enable event\n");
close(fd);
return ret;
}
data2[1] = tmp; /* Counted */
WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
data2[2] = tmp; /* Not Counted */
WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 2);
close(fd);
return 0;
#endif
}
static struct test_case wp_tests[] = {
TEST_CASE_REASON("Read Only Watchpoint", wp_ro, "missing hardware support"),
TEST_CASE_REASON("Write Only Watchpoint", wp_wo, "missing hardware support"),
TEST_CASE_REASON("Read / Write Watchpoint", wp_rw, "missing hardware support"),
TEST_CASE_REASON("Modify Watchpoint", wp_modify, "missing hardware support"),
{ .name = NULL, }
};
struct test_suite suite__wp = {
.desc = "Watchpoint",
.test_cases = wp_tests,
};
|
