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/* $NetBSD: t_swapcontext.c,v 1.3 2013/05/05 10:28:11 skrll Exp $ */
/*
* Copyright (c) 2012 Emmanuel Dreyfus. 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD");
#include <ucontext.h>
#include <stdio.h>
#include <stdlib.h>
#include <lwp.h>
#include <atf-c.h>
#define STACKSIZE 65536
char stack[STACKSIZE];
ucontext_t nctx;
ucontext_t octx;
void *otls;
void *ntls;
int val1, val2;
int alter_tlsbase;
/* ARGSUSED0 */
static void
swapfunc(void *arg)
{
ntls = _lwp_getprivate();
printf("after swapcontext TLS pointer = %p\n", ntls);
if (alter_tlsbase) {
ATF_REQUIRE_EQ(ntls, &val1);
printf("TLS pointer modified by swapcontext()\n");
} else {
ATF_REQUIRE_EQ(ntls, &val2);
printf("TLS pointer left untouched by swapcontext()\n");
}
/* Go back in main */
ATF_REQUIRE(swapcontext(&nctx, &octx));
/* NOTREACHED */
return;
}
static void
mainfunc(void)
{
printf("Testing if swapcontext() alters TLS pointer if _UC_TLSBASE "
"is %s\n", (alter_tlsbase) ? "left set" : "cleared");
_lwp_setprivate(&val1);
printf("before swapcontext TLS pointer = %p\n", &val1);
ATF_REQUIRE(getcontext(&nctx) == 0);
nctx.uc_stack.ss_sp = stack;
nctx.uc_stack.ss_size = sizeof(stack);
#ifndef _UC_TLSBASE
ATF_REQUIRE_MSG(0, "_UC_TLSBASE is not defined");
#else /* _UC_TLSBASE */
ATF_REQUIRE(nctx.uc_flags & _UC_TLSBASE);
if (!alter_tlsbase)
nctx.uc_flags &= ~_UC_TLSBASE;
#endif /* _UC_TLSBASE */
makecontext(&nctx, swapfunc, 0);
_lwp_setprivate(&val2);
otls = _lwp_getprivate();
printf("before swapcontext TLS pointer = %p\n", otls);
ATF_REQUIRE(swapcontext(&octx, &nctx) == 0);
printf("Test completed\n");
}
ATF_TC(swapcontext1);
ATF_TC_HEAD(swapcontext1, tc)
{
atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can let "
"TLS pointer untouched");
}
ATF_TC_BODY(swapcontext1, tc)
{
alter_tlsbase = 0;
mainfunc();
}
ATF_TC(swapcontext2);
ATF_TC_HEAD(swapcontext2, tc)
{
atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can "
"modify TLS pointer");
}
ATF_TC_BODY(swapcontext2, tc)
{
alter_tlsbase = 1;
mainfunc();
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, swapcontext1);
ATF_TP_ADD_TC(tp, swapcontext2);
return atf_no_error();
}
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