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313 lines
8.3 KiB
313 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Inspired by breakpoint overflow test done by |
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* Vince Weaver <[email protected]> for perf_event_tests |
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* (git://github.com/deater/perf_event_tests) |
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*/ |
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/* |
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* Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select |
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* 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. |
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*/ |
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#define __SANE_USERSPACE_TYPES__ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <sys/ioctl.h> |
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#include <time.h> |
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#include <fcntl.h> |
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#include <signal.h> |
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#include <sys/mman.h> |
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#include <linux/compiler.h> |
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#include <linux/hw_breakpoint.h> |
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#include "tests.h" |
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#include "debug.h" |
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#include "event.h" |
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#include "perf-sys.h" |
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#include "cloexec.h" |
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static int fd1; |
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static int fd2; |
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static int fd3; |
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static int overflows; |
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static int overflows_2; |
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volatile long the_var; |
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/* |
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* Use ASM to ensure watchpoint and breakpoint can be triggered |
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* at one instruction. |
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*/ |
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#if defined (__x86_64__) |
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extern void __test_function(volatile long *ptr); |
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asm ( |
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".pushsection .text;" |
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".globl __test_function\n" |
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".type __test_function, @function;" |
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"__test_function:\n" |
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"incq (%rdi)\n" |
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"ret\n" |
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".popsection\n"); |
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#else |
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static void __test_function(volatile long *ptr) |
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{ |
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*ptr = 0x1234; |
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} |
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#endif |
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static noinline int test_function(void) |
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{ |
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__test_function(&the_var); |
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the_var++; |
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return time(NULL); |
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} |
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static void sig_handler_2(int signum __maybe_unused, |
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siginfo_t *oh __maybe_unused, |
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void *uc __maybe_unused) |
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{ |
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overflows_2++; |
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if (overflows_2 > 10) { |
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ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); |
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} |
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} |
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static void sig_handler(int signum __maybe_unused, |
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siginfo_t *oh __maybe_unused, |
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void *uc __maybe_unused) |
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{ |
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overflows++; |
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if (overflows > 10) { |
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/* |
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* This should be executed only once during |
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* this test, if we are here for the 10th |
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* time, consider this the recursive issue. |
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* |
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* We can get out of here by disable events, |
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* so no new SIGIO is delivered. |
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*/ |
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ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); |
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} |
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} |
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static int __event(bool is_x, void *addr, int sig) |
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{ |
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struct perf_event_attr pe; |
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int fd; |
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memset(&pe, 0, sizeof(struct perf_event_attr)); |
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pe.type = PERF_TYPE_BREAKPOINT; |
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pe.size = sizeof(struct perf_event_attr); |
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pe.config = 0; |
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pe.bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W; |
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pe.bp_addr = (unsigned long) addr; |
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pe.bp_len = sizeof(long); |
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pe.sample_period = 1; |
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pe.sample_type = PERF_SAMPLE_IP; |
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pe.wakeup_events = 1; |
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pe.disabled = 1; |
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pe.exclude_kernel = 1; |
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pe.exclude_hv = 1; |
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fd = sys_perf_event_open(&pe, 0, -1, -1, |
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perf_event_open_cloexec_flag()); |
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if (fd < 0) { |
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pr_debug("failed opening event %llx\n", pe.config); |
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return TEST_FAIL; |
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} |
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fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); |
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fcntl(fd, F_SETSIG, sig); |
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fcntl(fd, F_SETOWN, getpid()); |
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ioctl(fd, PERF_EVENT_IOC_RESET, 0); |
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return fd; |
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} |
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static int bp_event(void *addr, int sig) |
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{ |
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return __event(true, addr, sig); |
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} |
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static int wp_event(void *addr, int sig) |
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{ |
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return __event(false, addr, sig); |
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} |
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static long long bp_count(int fd) |
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{ |
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long long count; |
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int ret; |
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ret = read(fd, &count, sizeof(long long)); |
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if (ret != sizeof(long long)) { |
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pr_debug("failed to read: %d\n", ret); |
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return TEST_FAIL; |
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} |
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return count; |
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} |
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int test__bp_signal(struct test *test __maybe_unused, int subtest __maybe_unused) |
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{ |
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struct sigaction sa; |
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long long count1, count2, count3; |
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/* setup SIGIO signal handler */ |
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memset(&sa, 0, sizeof(struct sigaction)); |
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sa.sa_sigaction = (void *) sig_handler; |
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sa.sa_flags = SA_SIGINFO; |
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if (sigaction(SIGIO, &sa, NULL) < 0) { |
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pr_debug("failed setting up signal handler\n"); |
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return TEST_FAIL; |
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} |
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sa.sa_sigaction = (void *) sig_handler_2; |
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if (sigaction(SIGUSR1, &sa, NULL) < 0) { |
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pr_debug("failed setting up signal handler 2\n"); |
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return TEST_FAIL; |
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} |
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/* |
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* We create following events: |
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* |
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* fd1 - breakpoint event on __test_function with SIGIO |
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* signal configured. We should get signal |
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* notification each time the breakpoint is hit |
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* |
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* fd2 - breakpoint event on sig_handler with SIGUSR1 |
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* configured. We should get SIGUSR1 each time when |
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* breakpoint is hit |
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* |
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* fd3 - watchpoint event on __test_function with SIGIO |
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* configured. |
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* |
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* Following processing should happen: |
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* Exec: Action: Result: |
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* incq (%rdi) - fd1 event breakpoint hit -> count1 == 1 |
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* - SIGIO is delivered |
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* sig_handler - fd2 event breakpoint hit -> count2 == 1 |
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* - SIGUSR1 is delivered |
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* sig_handler_2 -> overflows_2 == 1 (nested signal) |
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* sys_rt_sigreturn - return from sig_handler_2 |
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* overflows++ -> overflows = 1 |
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* sys_rt_sigreturn - return from sig_handler |
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* incq (%rdi) - fd3 event watchpoint hit -> count3 == 1 (wp and bp in one insn) |
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* - SIGIO is delivered |
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* sig_handler - fd2 event breakpoint hit -> count2 == 2 |
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* - SIGUSR1 is delivered |
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* sig_handler_2 -> overflows_2 == 2 (nested signal) |
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* sys_rt_sigreturn - return from sig_handler_2 |
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* overflows++ -> overflows = 2 |
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* sys_rt_sigreturn - return from sig_handler |
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* the_var++ - fd3 event watchpoint hit -> count3 == 2 (standalone watchpoint) |
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* - SIGIO is delivered |
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* sig_handler - fd2 event breakpoint hit -> count2 == 3 |
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* - SIGUSR1 is delivered |
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* sig_handler_2 -> overflows_2 == 3 (nested signal) |
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* sys_rt_sigreturn - return from sig_handler_2 |
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* overflows++ -> overflows == 3 |
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* sys_rt_sigreturn - return from sig_handler |
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* |
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* The test case check following error conditions: |
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* - we get stuck in signal handler because of debug |
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* exception being triggered recursively due to |
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* the wrong RF EFLAG management |
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* |
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* - we never trigger the sig_handler breakpoint due |
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* to the wrong RF EFLAG management |
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* |
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*/ |
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fd1 = bp_event(__test_function, SIGIO); |
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fd2 = bp_event(sig_handler, SIGUSR1); |
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fd3 = wp_event((void *)&the_var, SIGIO); |
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ioctl(fd1, PERF_EVENT_IOC_ENABLE, 0); |
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ioctl(fd2, PERF_EVENT_IOC_ENABLE, 0); |
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ioctl(fd3, PERF_EVENT_IOC_ENABLE, 0); |
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/* |
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* Kick off the test by triggering 'fd1' |
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* breakpoint. |
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*/ |
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test_function(); |
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ioctl(fd1, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd2, PERF_EVENT_IOC_DISABLE, 0); |
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ioctl(fd3, PERF_EVENT_IOC_DISABLE, 0); |
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count1 = bp_count(fd1); |
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count2 = bp_count(fd2); |
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count3 = bp_count(fd3); |
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close(fd1); |
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close(fd2); |
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close(fd3); |
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pr_debug("count1 %lld, count2 %lld, count3 %lld, overflow %d, overflows_2 %d\n", |
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count1, count2, count3, overflows, overflows_2); |
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if (count1 != 1) { |
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if (count1 == 11) |
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pr_debug("failed: RF EFLAG recursion issue detected\n"); |
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else |
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pr_debug("failed: wrong count for bp1: %lld, expected 1\n", count1); |
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} |
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if (overflows != 3) |
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pr_debug("failed: wrong overflow (%d) hit, expected 3\n", overflows); |
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if (overflows_2 != 3) |
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pr_debug("failed: wrong overflow_2 (%d) hit, expected 3\n", overflows_2); |
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if (count2 != 3) |
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pr_debug("failed: wrong count for bp2 (%lld), expected 3\n", count2); |
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if (count3 != 2) |
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pr_debug("failed: wrong count for bp3 (%lld), expected 2\n", count3); |
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return count1 == 1 && overflows == 3 && count2 == 3 && overflows_2 == 3 && count3 == 2 ? |
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TEST_OK : TEST_FAIL; |
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} |
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bool test__bp_signal_is_supported(void) |
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{ |
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/* |
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* PowerPC and S390 do not support creation of instruction |
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* breakpoints using the perf_event interface. |
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* |
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* ARM requires explicit rounding down of the instruction |
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* pointer in Thumb mode, and then requires the single-step |
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* to be handled explicitly in the overflow handler to avoid |
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* stepping into the SIGIO handler and getting stuck on the |
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* breakpointed instruction. |
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* |
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* Since arm64 has the same issue with arm for the single-step |
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* handling, this case also gets stuck on the breakpointed |
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* instruction. |
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* |
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* Just disable the test for these architectures until these |
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* issues are resolved. |
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*/ |
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#if defined(__powerpc__) || defined(__s390x__) || defined(__arm__) || \ |
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defined(__aarch64__) |
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return false; |
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#else |
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return true; |
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#endif |
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}
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