215 lines · c
1// SPDX-License-Identifier: GPL-2.02#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#else27volatile u64 data1;28#endif29volatile 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#endif75 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#else82 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#endif98}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#else106 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#endif122}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#else130 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#endif147}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#else154 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#endif201}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};215