![Shuah Khan](/assets/img/avatar_default.png)
Convert breakpoint_test_arm64 output to TAP13 format. Use ksft_* var arg msg api to include strerror() info. in the output. Change output from child process to use ksft_print_msg() instead of ksft_exit_* to avoid double counting tests and ensure parent process does the test counter incrementing. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
258 lines
5.8 KiB
C
258 lines
5.8 KiB
C
/*
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* Copyright (C) 2016 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Original Code by Pavel Labath <labath@google.com>
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*
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* Code modified by Pratyush Anand <panand@redhat.com>
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* for testing different byte select for each access size.
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*
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ptrace.h>
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#include <sys/param.h>
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#include <sys/uio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <elf.h>
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#include <errno.h>
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#include <signal.h>
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#include "../kselftest.h"
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static volatile uint8_t var[96] __attribute__((__aligned__(32)));
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static void child(int size, int wr)
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{
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volatile uint8_t *addr = &var[32 + wr];
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if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
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ksft_print_msg(
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"ptrace(PTRACE_TRACEME) failed: %s\n",
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strerror(errno));
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_exit(1);
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}
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if (raise(SIGSTOP) != 0) {
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ksft_print_msg(
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"raise(SIGSTOP) failed: %s\n", strerror(errno));
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_exit(1);
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}
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if ((uintptr_t) addr % size) {
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ksft_print_msg(
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"Wrong address write for the given size: %s\n",
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strerror(errno));
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_exit(1);
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}
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switch (size) {
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case 1:
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*addr = 47;
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break;
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case 2:
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*(uint16_t *)addr = 47;
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break;
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case 4:
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*(uint32_t *)addr = 47;
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break;
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case 8:
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*(uint64_t *)addr = 47;
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break;
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case 16:
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__asm__ volatile ("stp x29, x30, %0" : "=m" (addr[0]));
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break;
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case 32:
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__asm__ volatile ("stp q29, q30, %0" : "=m" (addr[0]));
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break;
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}
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_exit(0);
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}
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static bool set_watchpoint(pid_t pid, int size, int wp)
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{
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const volatile uint8_t *addr = &var[32 + wp];
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const int offset = (uintptr_t)addr % 8;
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const unsigned int byte_mask = ((1 << size) - 1) << offset;
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const unsigned int type = 2; /* Write */
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const unsigned int enable = 1;
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const unsigned int control = byte_mask << 5 | type << 3 | enable;
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struct user_hwdebug_state dreg_state;
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struct iovec iov;
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memset(&dreg_state, 0, sizeof(dreg_state));
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dreg_state.dbg_regs[0].addr = (uintptr_t)(addr - offset);
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dreg_state.dbg_regs[0].ctrl = control;
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iov.iov_base = &dreg_state;
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iov.iov_len = offsetof(struct user_hwdebug_state, dbg_regs) +
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sizeof(dreg_state.dbg_regs[0]);
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if (ptrace(PTRACE_SETREGSET, pid, NT_ARM_HW_WATCH, &iov) == 0)
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return true;
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if (errno == EIO)
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ksft_print_msg(
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"ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) not supported on this hardware: %s\n",
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strerror(errno));
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ksft_print_msg(
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"ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) failed: %s\n",
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strerror(errno));
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return false;
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}
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static bool run_test(int wr_size, int wp_size, int wr, int wp)
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{
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int status;
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siginfo_t siginfo;
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pid_t pid = fork();
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pid_t wpid;
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if (pid < 0) {
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ksft_test_result_fail(
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"fork() failed: %s\n", strerror(errno));
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return false;
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}
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if (pid == 0)
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child(wr_size, wr);
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wpid = waitpid(pid, &status, __WALL);
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if (wpid != pid) {
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ksft_print_msg(
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"waitpid() failed: %s\n", strerror(errno));
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return false;
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}
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if (!WIFSTOPPED(status)) {
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ksft_print_msg(
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"child did not stop: %s\n", strerror(errno));
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return false;
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}
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if (WSTOPSIG(status) != SIGSTOP) {
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ksft_print_msg("child did not stop with SIGSTOP\n");
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return false;
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}
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if (!set_watchpoint(pid, wp_size, wp))
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return false;
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if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) {
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ksft_print_msg(
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"ptrace(PTRACE_SINGLESTEP) failed: %s\n",
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strerror(errno));
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return false;
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}
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alarm(3);
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wpid = waitpid(pid, &status, __WALL);
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if (wpid != pid) {
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ksft_print_msg(
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"waitpid() failed: %s\n", strerror(errno));
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return false;
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}
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alarm(0);
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if (WIFEXITED(status)) {
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ksft_print_msg("child did not single-step\n");
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return false;
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}
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if (!WIFSTOPPED(status)) {
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ksft_print_msg("child did not stop\n");
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return false;
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}
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if (WSTOPSIG(status) != SIGTRAP) {
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ksft_print_msg("child did not stop with SIGTRAP\n");
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return false;
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}
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if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0) {
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ksft_print_msg(
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"ptrace(PTRACE_GETSIGINFO): %s\n",
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strerror(errno));
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return false;
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}
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if (siginfo.si_code != TRAP_HWBKPT) {
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ksft_print_msg(
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"Unexpected si_code %d\n", siginfo.si_code);
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return false;
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}
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kill(pid, SIGKILL);
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wpid = waitpid(pid, &status, 0);
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if (wpid != pid) {
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ksft_print_msg(
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"waitpid() failed: %s\n", strerror(errno));
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return false;
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}
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return true;
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}
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static void sigalrm(int sig)
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{
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}
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int main(int argc, char **argv)
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{
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int opt;
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bool succeeded = true;
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struct sigaction act;
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int wr, wp, size;
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bool result;
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ksft_print_header();
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act.sa_handler = sigalrm;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, NULL);
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for (size = 1; size <= 32; size = size*2) {
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for (wr = 0; wr <= 32; wr = wr + size) {
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for (wp = wr - size; wp <= wr + size; wp = wp + size) {
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result = run_test(size, MIN(size, 8), wr, wp);
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if ((result && wr == wp) ||
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(!result && wr != wp))
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ksft_test_result_pass(
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"Test size = %d write offset = %d watchpoint offset = %d\n",
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size, wr, wp);
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else {
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ksft_test_result_fail(
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"Test size = %d write offset = %d watchpoint offset = %d\n",
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size, wr, wp);
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succeeded = false;
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}
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}
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}
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}
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for (size = 1; size <= 32; size = size*2) {
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if (run_test(size, 8, -size, -8))
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ksft_test_result_pass(
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"Test size = %d write offset = %d watchpoint offset = -8\n",
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size, -size);
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else {
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ksft_test_result_fail(
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"Test size = %d write offset = %d watchpoint offset = -8\n",
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size, -size);
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succeeded = false;
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}
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}
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if (succeeded)
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ksft_exit_pass();
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else
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ksft_exit_fail();
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}
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