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- // 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];
- 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;
- }
- static int wp_ro_test(void)
- {
- 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;
- }
- static int wp_wo_test(void)
- {
- 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;
- }
- static int wp_rw_test(void)
- {
- 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;
- }
- static int wp_modify_test(void)
- {
- 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;
- }
- static bool wp_ro_supported(void)
- {
- #if defined (__x86_64__) || defined (__i386__)
- return false;
- #else
- return true;
- #endif
- }
- static void wp_ro_skip_msg(void)
- {
- #if defined (__x86_64__) || defined (__i386__)
- pr_debug("Hardware does not support read only watchpoints.\n");
- #endif
- }
- static struct {
- const char *desc;
- int (*target_func)(void);
- bool (*is_supported)(void);
- void (*skip_msg)(void);
- } wp_testcase_table[] = {
- {
- .desc = "Read Only Watchpoint",
- .target_func = &wp_ro_test,
- .is_supported = &wp_ro_supported,
- .skip_msg = &wp_ro_skip_msg,
- },
- {
- .desc = "Write Only Watchpoint",
- .target_func = &wp_wo_test,
- },
- {
- .desc = "Read / Write Watchpoint",
- .target_func = &wp_rw_test,
- },
- {
- .desc = "Modify Watchpoint",
- .target_func = &wp_modify_test,
- },
- };
- int test__wp_subtest_get_nr(void)
- {
- return (int)ARRAY_SIZE(wp_testcase_table);
- }
- const char *test__wp_subtest_get_desc(int i)
- {
- if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
- return NULL;
- return wp_testcase_table[i].desc;
- }
- int test__wp(struct test *test __maybe_unused, int i)
- {
- if (i < 0 || i >= (int)ARRAY_SIZE(wp_testcase_table))
- return TEST_FAIL;
- if (wp_testcase_table[i].is_supported &&
- !wp_testcase_table[i].is_supported()) {
- wp_testcase_table[i].skip_msg();
- return TEST_SKIP;
- }
- return !wp_testcase_table[i].target_func() ? TEST_OK : TEST_FAIL;
- }
- /* The s390 so far does not have support for
- * instruction breakpoint using the perf_event_open() system call.
- */
- bool test__wp_is_supported(void)
- {
- #if defined(__s390x__)
- return false;
- #else
- return true;
- #endif
- }
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