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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215// 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)
#ifdef __i386__/* Only breakpoint length less-than 8 has hardware support on i386. */static volatile u32 data1;#elsestatic volatile u64 data1;#endifstatic 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,};