1 /* $NetBSD: t_swapcontext.c,v 1.3 2013/05/05 10:28:11 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 2012 Emmanuel Dreyfus. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __RCSID("$NetBSD"); 30 31 #include <ucontext.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <lwp.h> 35 36 #include <atf-c.h> 37 38 #define STACKSIZE 65536 39 40 char stack[STACKSIZE]; 41 ucontext_t nctx; 42 ucontext_t octx; 43 void *otls; 44 void *ntls; 45 int val1, val2; 46 int alter_tlsbase; 47 48 /* ARGSUSED0 */ 49 static void 50 swapfunc(void *arg) 51 { 52 ntls = _lwp_getprivate(); 53 printf("after swapcontext TLS pointer = %p\n", ntls); 54 55 if (alter_tlsbase) { 56 ATF_REQUIRE_EQ(ntls, &val1); 57 printf("TLS pointer modified by swapcontext()\n"); 58 } else { 59 ATF_REQUIRE_EQ(ntls, &val2); 60 printf("TLS pointer left untouched by swapcontext()\n"); 61 } 62 63 /* Go back in main */ 64 ATF_REQUIRE(swapcontext(&nctx, &octx)); 65 66 /* NOTREACHED */ 67 return; 68 } 69 70 static void 71 mainfunc(void) 72 { 73 printf("Testing if swapcontext() alters TLS pointer if _UC_TLSBASE " 74 "is %s\n", (alter_tlsbase) ? "left set" : "cleared"); 75 76 _lwp_setprivate(&val1); 77 printf("before swapcontext TLS pointer = %p\n", &val1); 78 79 ATF_REQUIRE(getcontext(&nctx) == 0); 80 81 nctx.uc_stack.ss_sp = stack; 82 nctx.uc_stack.ss_size = sizeof(stack); 83 84 #ifndef _UC_TLSBASE 85 ATF_REQUIRE_MSG(0, "_UC_TLSBASE is not defined"); 86 #else /* _UC_TLSBASE */ 87 ATF_REQUIRE(nctx.uc_flags & _UC_TLSBASE); 88 if (!alter_tlsbase) 89 nctx.uc_flags &= ~_UC_TLSBASE; 90 #endif /* _UC_TLSBASE */ 91 92 makecontext(&nctx, swapfunc, 0); 93 94 _lwp_setprivate(&val2); 95 otls = _lwp_getprivate(); 96 printf("before swapcontext TLS pointer = %p\n", otls); 97 ATF_REQUIRE(swapcontext(&octx, &nctx) == 0); 98 99 printf("Test completed\n"); 100 } 101 102 103 ATF_TC(swapcontext1); 104 ATF_TC_HEAD(swapcontext1, tc) 105 { 106 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can let " 107 "TLS pointer untouched"); 108 } 109 ATF_TC_BODY(swapcontext1, tc) 110 { 111 alter_tlsbase = 0; 112 mainfunc(); 113 } 114 115 ATF_TC(swapcontext2); 116 ATF_TC_HEAD(swapcontext2, tc) 117 { 118 atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can " 119 "modify TLS pointer"); 120 } 121 ATF_TC_BODY(swapcontext2, tc) 122 { 123 alter_tlsbase = 1; 124 mainfunc(); 125 } 126 127 ATF_TP_ADD_TCS(tp) 128 { 129 ATF_TP_ADD_TC(tp, swapcontext1); 130 ATF_TP_ADD_TC(tp, swapcontext2); 131 132 return atf_no_error(); 133 } 134