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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | // SPDX-License-Identifier: GPL-2.0 #include <stdlib.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <sys/ioctl.h> #include <linux/compiler.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) { fd = -errno; 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 fd == -ENODEV ? TEST_SKIP : -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 fd == -ENODEV ? TEST_SKIP : -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 fd == -ENODEV ? TEST_SKIP : -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 fd == -ENODEV ? TEST_SKIP : -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) { if (errno == ENOTTY) { test->test_cases[subtest].skip_reason = "missing kernel support"; ret = TEST_SKIP; } 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, }; |