xref: /src/tests/lib/libc/sys/t_ptrace_x86_wait.h

/*	$NetBSD: t_ptrace_x86_wait.h,v 1.5 2018/04/08 17:20:18 kamil Exp $	*/

/*-
 * Copyright (c) 2016 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if defined(__i386__) || defined(__x86_64__)
union u {
	unsigned long raw;
	struct {
		unsigned long local_dr0_breakpoint : 1;		/* 0 */
		unsigned long global_dr0_breakpoint : 1;	/* 1 */
		unsigned long local_dr1_breakpoint : 1;		/* 2 */
		unsigned long global_dr1_breakpoint : 1;	/* 3 */
		unsigned long local_dr2_breakpoint : 1;		/* 4 */
		unsigned long global_dr2_breakpoint : 1;	/* 5 */
		unsigned long local_dr3_breakpoint : 1;		/* 6 */
		unsigned long global_dr3_breakpoint : 1;	/* 7 */
		unsigned long local_exact_breakpt : 1;		/* 8 */
		unsigned long global_exact_breakpt : 1;		/* 9 */
		unsigned long reserved_10 : 1;			/* 10 */
		unsigned long rest_trans_memory : 1;		/* 11 */
		unsigned long reserved_12 : 1;			/* 12 */
		unsigned long general_detect_enable : 1;	/* 13 */
		unsigned long reserved_14 : 1;			/* 14 */
		unsigned long reserved_15 : 1;			/* 15 */
		unsigned long condition_dr0 : 2;		/* 16-17 */
		unsigned long len_dr0 : 2;			/* 18-19 */
		unsigned long condition_dr1 : 2;		/* 20-21 */
		unsigned long len_dr1 : 2;			/* 22-23 */
		unsigned long condition_dr2 : 2;		/* 24-25 */
		unsigned long len_dr2 : 2;			/* 26-27 */
		unsigned long condition_dr3 : 2;		/* 28-29 */
		unsigned long len_dr3 : 2;			/* 30-31 */
	} bits;
};

static bool
can_we_set_dbregs(void)
{
	static long euid = -1;
	static int user_set_dbregs  = -1;
	size_t user_set_dbregs_len = sizeof(user_set_dbregs);

	if (euid == -1)
		euid = geteuid();

	if (euid == 0)
		return true;

	if (user_set_dbregs == -1) {
		if (sysctlbyname("security.models.extensions.user_set_dbregs",
			&user_set_dbregs, &user_set_dbregs_len, NULL, 0)
			== -1) {
			return false;
		}
	}

	if (user_set_dbregs > 0)
		return true;
	else
		return false;
}

ATF_TC(dbregs_print);
ATF_TC_HEAD(dbregs_print, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify plain PT_GETDBREGS with printing Debug Registers");
}

ATF_TC_BODY(dbregs_print, tc)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r;
	size_t i;

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r, 0) != -1);

	DPRINTF("State of the debug registers:\n");
	for (i = 0; i < __arraycount(r.dr); i++)
		DPRINTF("r[%zu]=%" PRIxREGISTER "\n", i, r.dr[i]);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}


enum dbreg_preserve_mode {
	dbreg_preserve_mode_none,
	dbreg_preserve_mode_yield,
	dbreg_preserve_mode_continued
};

static void
dbreg_preserve(int reg, enum dbreg_preserve_mode mode)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	struct dbreg r2;
	size_t i;
	int watchme;

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		if (mode == dbreg_preserve_mode_continued) {
			DPRINTF("Before raising %s from child\n",
			       strsignal(sigval));
			FORKEE_ASSERT(raise(sigval) == 0);
		}

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[reg] = (long)(intptr_t)&watchme;
	DPRINTF("Set DR0 (r1.dr[%d]) to new value %" PRIxREGISTER "\n",
	    reg, r1.dr[reg]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	switch (mode) {
	case dbreg_preserve_mode_none:
		break;
	case dbreg_preserve_mode_yield:
		DPRINTF("Yields a processor voluntarily and gives other "
		       "threads a chance to run without waiting for an "
		       "involuntary preemptive switch\n");
		sched_yield();
		break;
	case dbreg_preserve_mode_continued:
		DPRINTF("Call CONTINUE for the child process\n");
	        SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

		DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
		TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

		validate_status_stopped(status, sigval);
		break;
	}

	DPRINTF("Call GETDBREGS for the child process (r2)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);

	DPRINTF("Assert that (r1) and (r2) are the same\n");
	SYSCALL_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) == 0);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}


ATF_TC(dbregs_preserve_dr0);
ATF_TC_HEAD(dbregs_preserve_dr0, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR0 is preserved across ptrace(2) calls");
}

ATF_TC_BODY(dbregs_preserve_dr0, tc)
{
	dbreg_preserve(0, dbreg_preserve_mode_none);
}

ATF_TC(dbregs_preserve_dr1);
ATF_TC_HEAD(dbregs_preserve_dr1, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR1 is preserved across ptrace(2) calls");
}

ATF_TC_BODY(dbregs_preserve_dr1, tc)
{
	dbreg_preserve(1, dbreg_preserve_mode_none);
}

ATF_TC(dbregs_preserve_dr2);
ATF_TC_HEAD(dbregs_preserve_dr2, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR2 is preserved across ptrace(2) calls");
}

ATF_TC_BODY(dbregs_preserve_dr2, tc)
{
	dbreg_preserve(2, dbreg_preserve_mode_none);
}

ATF_TC(dbregs_preserve_dr3);
ATF_TC_HEAD(dbregs_preserve_dr3, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR3 is preserved across ptrace(2) calls");
}

ATF_TC_BODY(dbregs_preserve_dr3, tc)
{
	dbreg_preserve(3, dbreg_preserve_mode_none);
}

ATF_TC(dbregs_preserve_dr0_yield);
ATF_TC_HEAD(dbregs_preserve_dr0_yield, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR0 is preserved across ptrace(2) calls with "
	    "scheduler yield");
}

ATF_TC_BODY(dbregs_preserve_dr0_yield, tc)
{
	dbreg_preserve(0, dbreg_preserve_mode_yield);
}

ATF_TC(dbregs_preserve_dr1_yield);
ATF_TC_HEAD(dbregs_preserve_dr1_yield, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR1 is preserved across ptrace(2) calls with "
	    "scheduler yield");
}

ATF_TC_BODY(dbregs_preserve_dr1_yield, tc)
{
	dbreg_preserve(0, dbreg_preserve_mode_yield);
}

ATF_TC(dbregs_preserve_dr2_yield);
ATF_TC_HEAD(dbregs_preserve_dr2_yield, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR2 is preserved across ptrace(2) calls with "
	    "scheduler yield");
}

ATF_TC_BODY(dbregs_preserve_dr2_yield, tc)
{
	dbreg_preserve(0, dbreg_preserve_mode_yield);
}


ATF_TC(dbregs_preserve_dr3_yield);
ATF_TC_HEAD(dbregs_preserve_dr3_yield, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR3 is preserved across ptrace(2) calls with "
	    "scheduler yield");
}

ATF_TC_BODY(dbregs_preserve_dr3_yield, tc)
{
	dbreg_preserve(3, dbreg_preserve_mode_yield);
}

ATF_TC(dbregs_preserve_dr0_continued);
ATF_TC_HEAD(dbregs_preserve_dr0_continued, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR0 is preserved across ptrace(2) calls and "
	    "with continued child");
}

ATF_TC_BODY(dbregs_preserve_dr0_continued, tc)
{
	dbreg_preserve(0, dbreg_preserve_mode_continued);
}

ATF_TC(dbregs_preserve_dr1_continued);
ATF_TC_HEAD(dbregs_preserve_dr1_continued, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR1 is preserved across ptrace(2) calls and "
	    "with continued child");
}

ATF_TC_BODY(dbregs_preserve_dr1_continued, tc)
{
	dbreg_preserve(1, dbreg_preserve_mode_continued);
}

ATF_TC(dbregs_preserve_dr2_continued);
ATF_TC_HEAD(dbregs_preserve_dr2_continued, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR2 is preserved across ptrace(2) calls and "
	    "with continued child");
}

ATF_TC_BODY(dbregs_preserve_dr2_continued, tc)
{
	dbreg_preserve(2, dbreg_preserve_mode_continued);
}

ATF_TC(dbregs_preserve_dr3_continued);
ATF_TC_HEAD(dbregs_preserve_dr3_continued, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting DR3 is preserved across ptrace(2) calls and "
	    "with continued child");
}

ATF_TC_BODY(dbregs_preserve_dr3_continued, tc)
{
	dbreg_preserve(3, dbreg_preserve_mode_continued);
}


static void
dbregs_trap_variable(int reg, int cond, int len, bool write)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	size_t i;
	volatile int watchme = 0;
	union u dr7;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	dr7.raw = 0;
	switch (reg) {
	case 0:
		dr7.bits.global_dr0_breakpoint = 1;
		dr7.bits.condition_dr0 = cond;
		dr7.bits.len_dr0 = len;
	case 1:
		dr7.bits.global_dr1_breakpoint = 1;
		dr7.bits.condition_dr1 = cond;
		dr7.bits.len_dr1 = len;
	case 2:
		dr7.bits.global_dr2_breakpoint = 1;
		dr7.bits.condition_dr2 = cond;
		dr7.bits.len_dr2 = len;
	case 3:
		dr7.bits.global_dr3_breakpoint = 1;
		dr7.bits.condition_dr3 = cond;
		dr7.bits.len_dr3 = len;
		break;
	}

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		if (write)
			watchme = 1;
		else
			printf("watchme=%d\n", watchme);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[reg] = (long)(intptr_t)&watchme;
	DPRINTF("Set DR%d (r1.dr[%d]) to new value %" PRIxREGISTER "\n",
	    reg, reg, r1.dr[reg]);

	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	DPRINTF("Before checking siginfo_t\n");
	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}

ATF_TC(dbregs_dr0_trap_variable_writeonly_byte);
ATF_TC_HEAD(dbregs_dr0_trap_variable_writeonly_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data writes only and 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_writeonly_byte, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(0, 1, 0, true);
}

ATF_TC(dbregs_dr1_trap_variable_writeonly_byte);
ATF_TC_HEAD(dbregs_dr1_trap_variable_writeonly_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data writes only and 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_writeonly_byte, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(1, 1, 0, true);
}

ATF_TC(dbregs_dr2_trap_variable_writeonly_byte);
ATF_TC_HEAD(dbregs_dr2_trap_variable_writeonly_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data writes only and 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_writeonly_byte, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(2, 1, 0, true);
}

ATF_TC(dbregs_dr3_trap_variable_writeonly_byte);
ATF_TC_HEAD(dbregs_dr3_trap_variable_writeonly_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data writes only and 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_writeonly_byte, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(3, 1, 0, true);
}

ATF_TC(dbregs_dr0_trap_variable_writeonly_2bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_writeonly_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data writes only and 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_writeonly_2bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(0, 1, 1, true);
}

ATF_TC(dbregs_dr1_trap_variable_writeonly_2bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_writeonly_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data writes only and 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_writeonly_2bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(1, 1, 1, true);
}

ATF_TC(dbregs_dr2_trap_variable_writeonly_2bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_writeonly_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data writes only and 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_writeonly_2bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(2, 1, 1, true);
}

ATF_TC(dbregs_dr3_trap_variable_writeonly_2bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_writeonly_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data writes only and 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_writeonly_2bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(3, 1, 1, true);
}

ATF_TC(dbregs_dr0_trap_variable_writeonly_4bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_writeonly_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data writes only and 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_writeonly_4bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(0, 1, 3, true);
}

ATF_TC(dbregs_dr1_trap_variable_writeonly_4bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_writeonly_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data writes only and 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_writeonly_4bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(1, 1, 3, true);
}

ATF_TC(dbregs_dr2_trap_variable_writeonly_4bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_writeonly_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data writes only and 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_writeonly_4bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(2, 1, 3, true);
}

ATF_TC(dbregs_dr3_trap_variable_writeonly_4bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_writeonly_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data writes only and 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_writeonly_4bytes, tc)
{
	/* 0b01 -- break on data write only */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(3, 1, 3, true);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_write_byte);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_write_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in read 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_write_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(0, 3, 0, true);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_write_byte);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_write_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in read 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_write_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(1, 3, 0, true);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_write_byte);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_write_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in read 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_write_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(2, 3, 0, true);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_write_byte);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_write_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in read 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_write_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(3, 3, 0, true);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_write_2bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_write_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in read 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_write_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(0, 3, 1, true);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_write_2bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_write_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in read 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_write_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(1, 3, 1, true);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_write_2bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_write_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in read 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_write_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(2, 3, 1, true);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_write_2bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_write_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in read 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_write_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(3, 3, 1, true);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_write_4bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_write_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in read 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_write_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(0, 3, 3, true);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_write_4bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_write_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in read 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_write_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(1, 3, 3, true);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_write_4bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_write_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in read 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_write_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(2, 3, 3, true);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_write_4bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_write_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in read 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_write_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(3, 3, 3, true);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_read_byte);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_read_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in write 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_read_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(0, 3, 0, false);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_read_byte);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_read_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in write 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_read_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(1, 3, 0, false);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_read_byte);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_read_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in write 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_read_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(2, 3, 0, false);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_read_byte);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_read_byte, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in write 1 byte mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_read_byte, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b00 -- 1 byte */

	dbregs_trap_variable(3, 3, 0, false);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_read_2bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_read_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in write 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_read_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(0, 3, 1, false);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_read_2bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_read_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in write 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_read_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(1, 3, 1, false);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_read_2bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_read_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in write 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_read_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(2, 3, 1, false);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_read_2bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_read_2bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in write 2 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_read_2bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b01 -- 2 bytes */

	dbregs_trap_variable(3, 3, 1, false);
}

ATF_TC(dbregs_dr0_trap_variable_readwrite_read_4bytes);
ATF_TC_HEAD(dbregs_dr0_trap_variable_readwrite_read_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on data read/write trap in write 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr0_trap_variable_readwrite_read_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(0, 3, 3, false);
}

ATF_TC(dbregs_dr1_trap_variable_readwrite_read_4bytes);
ATF_TC_HEAD(dbregs_dr1_trap_variable_readwrite_read_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on data read/write trap in write 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr1_trap_variable_readwrite_read_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(1, 3, 3, false);
}

ATF_TC(dbregs_dr2_trap_variable_readwrite_read_4bytes);
ATF_TC_HEAD(dbregs_dr2_trap_variable_readwrite_read_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on data read/write trap in write 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr2_trap_variable_readwrite_read_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(2, 3, 3, false);
}

ATF_TC(dbregs_dr3_trap_variable_readwrite_read_4bytes);
ATF_TC_HEAD(dbregs_dr3_trap_variable_readwrite_read_4bytes, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on data read/write trap in write 4 bytes mode)");
}

ATF_TC_BODY(dbregs_dr3_trap_variable_readwrite_read_4bytes, tc)
{
	/* 0b11 -- break on data write&read */
	/* 0b11 -- 4 bytes */

	dbregs_trap_variable(3, 3, 3, false);
}

#if defined(HAVE_DBREGS)
ATF_TC(dbregs_dr0_trap_code);
ATF_TC_HEAD(dbregs_dr0_trap_code, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR0 triggers SIGTRAP "
	    "(break on code execution trap)");
}

ATF_TC_BODY(dbregs_dr0_trap_code, tc)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	size_t i;
	volatile int watchme = 1;
	union u dr7;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	dr7.raw = 0;
	dr7.bits.global_dr0_breakpoint = 1;
	dr7.bits.condition_dr0 = 0;	/* 0b00 -- break on code execution */
	dr7.bits.len_dr0 = 0;		/* 0b00 -- 1 byte */

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		printf("check_happy(%d)=%d\n", watchme, check_happy(watchme));

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[0] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR0 (r1.dr[0]) to new value %" PRIxREGISTER "\n",
	    r1.dr[0]);

	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	DPRINTF("Before checking siginfo_t\n");
	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);

	DPRINTF("Remove code trap from check_happy=%p\n", check_happy);
	dr7.bits.global_dr0_breakpoint = 0;
	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
#endif

#if defined(HAVE_DBREGS)
ATF_TC(dbregs_dr1_trap_code);
ATF_TC_HEAD(dbregs_dr1_trap_code, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR1 triggers SIGTRAP "
	    "(break on code execution trap)");
}

ATF_TC_BODY(dbregs_dr1_trap_code, tc)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	size_t i;
	volatile int watchme = 1;
	union u dr7;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	dr7.raw = 0;
	dr7.bits.global_dr1_breakpoint = 1;
	dr7.bits.condition_dr1 = 0;	/* 0b00 -- break on code execution */
	dr7.bits.len_dr1 = 0;		/* 0b00 -- 1 byte */

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		printf("check_happy(%d)=%d\n", watchme, check_happy(watchme));

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[1] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR1 (r1.dr[1]) to new value %" PRIxREGISTER "\n",
	    r1.dr[1]);

	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	DPRINTF("Before checking siginfo_t\n");
	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);

	DPRINTF("Remove code trap from check_happy=%p\n", check_happy);
	dr7.bits.global_dr1_breakpoint = 0;
	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
#endif

#if defined(HAVE_DBREGS)
ATF_TC(dbregs_dr2_trap_code);
ATF_TC_HEAD(dbregs_dr2_trap_code, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR2 triggers SIGTRAP "
	    "(break on code execution trap)");
}

ATF_TC_BODY(dbregs_dr2_trap_code, tc)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	size_t i;
	volatile int watchme = 1;
	union u dr7;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	dr7.raw = 0;
	dr7.bits.global_dr2_breakpoint = 1;
	dr7.bits.condition_dr2 = 0;	/* 0b00 -- break on code execution */
	dr7.bits.len_dr2 = 0;		/* 0b00 -- 1 byte */

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		printf("check_happy(%d)=%d\n", watchme, check_happy(watchme));

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[2] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR2 (r1.dr[2]) to new value %" PRIxREGISTER "\n",
	    r1.dr[2]);

	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	DPRINTF("Before checking siginfo_t\n");
	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);

	DPRINTF("Remove code trap from check_happy=%p\n", check_happy);
	dr7.bits.global_dr2_breakpoint = 0;
	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
#endif

#if defined(HAVE_DBREGS)
ATF_TC(dbregs_dr3_trap_code);
ATF_TC_HEAD(dbregs_dr3_trap_code, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that setting trap with DR3 triggers SIGTRAP "
	    "(break on code execution trap)");
}

ATF_TC_BODY(dbregs_dr3_trap_code, tc)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	struct dbreg r1;
	size_t i;
	volatile int watchme = 1;
	union u dr7;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	dr7.raw = 0;
	dr7.bits.global_dr3_breakpoint = 1;
	dr7.bits.condition_dr3 = 0;	/* 0b00 -- break on code execution */
	dr7.bits.len_dr3 = 0;		/* 0b00 -- 1 byte */

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		printf("check_happy(%d)=%d\n", watchme, check_happy(watchme));

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[3] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR3 (r1.dr[3]) to new value %" PRIxREGISTER "\n",
	    r1.dr[3]);

	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	DPRINTF("Before checking siginfo_t\n");
	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);

	DPRINTF("Remove code trap from check_happy=%p\n", check_happy);
	dr7.bits.global_dr3_breakpoint = 0;
	r1.dr[7] = dr7.raw;
	DPRINTF("Set DR7 (r1.dr[7]) to new value %" PRIxREGISTER "\n",
	    r1.dr[7]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Call CONTINUE for the child process\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}
#endif

volatile lwpid_t x86_the_lwp_id = 0;

static void __used
x86_lwp_main_func(void *arg)
{
	x86_the_lwp_id = _lwp_self();
	_lwp_exit();
}

static void
dbregs_dont_inherit_lwp(int reg)
{
	const int exitval = 5;
	const int sigval = SIGSTOP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	ptrace_state_t state;
	const int slen = sizeof(state);
	ptrace_event_t event;
	const int elen = sizeof(event);
	ucontext_t uc;
	lwpid_t lid;
	static const size_t ssize = 16*1024;
	void *stack;
	size_t i;
	struct dbreg r1;
	struct dbreg r2;

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before allocating memory for stack in child\n");
		FORKEE_ASSERT((stack = malloc(ssize)) != NULL);

		DPRINTF("Before making context for new lwp in child\n");
		_lwp_makecontext(&uc, x86_lwp_main_func, NULL, NULL, stack,
		    ssize);

		DPRINTF("Before creating new in child\n");
		FORKEE_ASSERT(_lwp_create(&uc, 0, &lid) == 0);

		DPRINTF("Before waiting for lwp %d to exit\n", lid);
		FORKEE_ASSERT(_lwp_wait(lid, NULL) == 0);

		DPRINTF("Before verifying that reported %d and running lid %d "
		    "are the same\n", lid, x86_the_lwp_id);
		FORKEE_ASSERT_EQ(lid, x86_the_lwp_id);

		DPRINTF("Before exiting of the child process\n");
		_exit(exitval);
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Set empty EVENT_MASK for the child %d\n", child);
	event.pe_set_event = PTRACE_LWP_CREATE;
	SYSCALL_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[reg] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR%d (r1.dr[%d]) to new value %" PRIxREGISTER "\n",
	    reg, reg, r1.dr[0]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child - expected stopped "
	    "SIGTRAP\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, SIGTRAP);

	SYSCALL_REQUIRE(ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);

	ATF_REQUIRE_EQ(state.pe_report_event, PTRACE_LWP_CREATE);

	lid = state.pe_lwp;
	DPRINTF("Reported PTRACE_LWP_CREATE event with lid %d\n", lid);

	DPRINTF("Call GETDBREGS for the child process new lwp (r2)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, lid) != -1);

	DPRINTF("State of the debug registers (r2):\n");
	for (i = 0; i < __arraycount(r2.dr); i++)
		DPRINTF("r2[%zu]=%" PRIxREGISTER "\n", i, r2.dr[i]);

	DPRINTF("Assert that (r1) and (r2) are not the same\n");
	ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child - expected exited\n",
	    TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_exited(status, exitval);

	DPRINTF("Before calling %s() for the child - expected no process\n",
	    TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}

ATF_TC(dbregs_dr0_dont_inherit_lwp);
ATF_TC_HEAD(dbregs_dr0_dont_inherit_lwp, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that 1 LWP creation is intercepted by ptrace(2) with "
	    "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 0 from "
	    "the forker thread is not inherited");
}

ATF_TC_BODY(dbregs_dr0_dont_inherit_lwp, tc)
{
	dbregs_dont_inherit_lwp(0);
}

ATF_TC(dbregs_dr1_dont_inherit_lwp);
ATF_TC_HEAD(dbregs_dr1_dont_inherit_lwp, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that 1 LWP creation is intercepted by ptrace(2) with "
	    "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 1 from "
	    "the forker thread is not inherited");
}

ATF_TC_BODY(dbregs_dr1_dont_inherit_lwp, tc)
{
	dbregs_dont_inherit_lwp(1);
}

ATF_TC(dbregs_dr2_dont_inherit_lwp);
ATF_TC_HEAD(dbregs_dr2_dont_inherit_lwp, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that 1 LWP creation is intercepted by ptrace(2) with "
	    "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 2 from "
	    "the forker thread is not inherited");
}

ATF_TC_BODY(dbregs_dr2_dont_inherit_lwp, tc)
{
	dbregs_dont_inherit_lwp(2);
}

ATF_TC(dbregs_dr3_dont_inherit_lwp);
ATF_TC_HEAD(dbregs_dr3_dont_inherit_lwp, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that 1 LWP creation is intercepted by ptrace(2) with "
	    "EVENT_MASK set to PTRACE_LWP_CREATE and Debug Register 3 from "
	    "the forker thread is not inherited");
}

ATF_TC_BODY(dbregs_dr3_dont_inherit_lwp, tc)
{
	dbregs_dont_inherit_lwp(3);
}

static void
dbregs_dont_inherit_execve(int reg)
{
	const int sigval = SIGTRAP;
	pid_t child, wpid;
#if defined(TWAIT_HAVE_STATUS)
	int status;
#endif
	size_t i;
	struct dbreg r1;
	struct dbreg r2;

	struct ptrace_siginfo info;
	memset(&info, 0, sizeof(info));

	if (!can_we_set_dbregs()) {
		atf_tc_skip("Either run this test as root or set sysctl(3) "
		            "security.models.extensions.user_set_dbregs to 1");
	}

	DPRINTF("Before forking process PID=%d\n", getpid());
	SYSCALL_REQUIRE((child = fork()) != -1);
	if (child == 0) {
		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);

		DPRINTF("Before raising %s from child\n", strsignal(sigval));
		FORKEE_ASSERT(raise(sigval) == 0);

		DPRINTF("Before calling execve(2) from child\n");
		execlp("/bin/echo", "/bin/echo", NULL);

		FORKEE_ASSERT(0 && "Not reached");
	}
	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Call GETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);

	DPRINTF("State of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	r1.dr[reg] = (long)(intptr_t)check_happy;
	DPRINTF("Set DR%d (r1.dr[%d]) to new value %" PRIxREGISTER "\n",
	    reg, reg, r1.dr[reg]);

	DPRINTF("New state of the debug registers (r1):\n");
	for (i = 0; i < __arraycount(r1.dr); i++)
		DPRINTF("r1[%zu]=%" PRIxREGISTER "\n", i, r1.dr[i]);

	DPRINTF("Call SETDBREGS for the child process (r1)\n");
	SYSCALL_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	validate_status_stopped(status, sigval);

	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);

	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
	DPRINTF("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
	    info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
	    info.psi_siginfo.si_errno);

	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval);
	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_EXEC);

	DPRINTF("Call GETDBREGS for the child process after execve(2)\n");
	SYSCALL_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);

	DPRINTF("State of the debug registers (r2):\n");
	for (i = 0; i < __arraycount(r2.dr); i++)
		DPRINTF("r2[%zu]=%" PRIxREGISTER "\n", i, r2.dr[i]);

	DPRINTF("Assert that (r1) and (r2) are not the same\n");
	ATF_REQUIRE(memcmp(&r1, &r2, sizeof(r1)) != 0);

	DPRINTF("Before resuming the child process where it left off and "
	    "without signal to be sent\n");
	SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);

	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
}

ATF_TC(dbregs_dr0_dont_inherit_execve);
ATF_TC_HEAD(dbregs_dr0_dont_inherit_execve, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that execve(2) is intercepted by tracer and Debug "
	    "Register 0 is reset");
}

ATF_TC_BODY(dbregs_dr0_dont_inherit_execve, tc)
{
	dbregs_dont_inherit_execve(0);
}

ATF_TC(dbregs_dr1_dont_inherit_execve);
ATF_TC_HEAD(dbregs_dr1_dont_inherit_execve, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that execve(2) is intercepted by tracer and Debug "
	    "Register 1 is reset");
}

ATF_TC_BODY(dbregs_dr1_dont_inherit_execve, tc)
{
	dbregs_dont_inherit_execve(1);
}

ATF_TC(dbregs_dr2_dont_inherit_execve);
ATF_TC_HEAD(dbregs_dr2_dont_inherit_execve, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that execve(2) is intercepted by tracer and Debug "
	    "Register 2 is reset");
}

ATF_TC_BODY(dbregs_dr2_dont_inherit_execve, tc)
{
	dbregs_dont_inherit_execve(2);
}

ATF_TC(dbregs_dr3_dont_inherit_execve);
ATF_TC_HEAD(dbregs_dr3_dont_inherit_execve, tc)
{
	atf_tc_set_md_var(tc, "descr",
	    "Verify that execve(2) is intercepted by tracer and Debug "
	    "Register 3 is reset");
}

ATF_TC_BODY(dbregs_dr3_dont_inherit_execve, tc)
{
	dbregs_dont_inherit_execve(3);
}
#define ATF_TP_ADD_TCS_PTRACE_WAIT_X86() \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_print); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr0); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr1); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr2); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr3); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr0_yield); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr1_yield); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr2_yield); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr3_yield); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr0_continued); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr1_continued); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr2_continued); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_preserve_dr3_continued); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_writeonly_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_writeonly_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_writeonly_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_writeonly_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_writeonly_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_writeonly_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_writeonly_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_writeonly_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_writeonly_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_writeonly_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_writeonly_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_writeonly_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_write_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_write_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_write_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_write_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_write_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_write_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_write_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_write_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_write_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_write_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_write_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_write_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_read_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_read_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_read_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_read_byte); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_read_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_read_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_read_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_read_2bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_variable_readwrite_read_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_variable_readwrite_read_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_variable_readwrite_read_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_variable_readwrite_read_4bytes); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_trap_code); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_trap_code); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_trap_code); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_trap_code); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_dont_inherit_lwp); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_dont_inherit_lwp); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_dont_inherit_lwp); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_dont_inherit_lwp); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr0_dont_inherit_execve); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr1_dont_inherit_execve); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr2_dont_inherit_execve); \
	ATF_TP_ADD_TC_HAVE_DBREGS(tp, dbregs_dr3_dont_inherit_execve);
#else
#define ATF_TP_ADD_TCS_PTRACE_WAIT_X86()
#endif