t_swapcontext.c revision 1.2.2.2
1 1.2.2.2 yamt /* $NetBSD: t_swapcontext.c,v 1.2.2.2 2012/10/30 19:00:02 yamt Exp $ */ 2 1.2.2.2 yamt 3 1.2.2.2 yamt /* 4 1.2.2.2 yamt * Copyright (c) 2012 Emmanuel Dreyfus. All rights reserved. 5 1.2.2.2 yamt * 6 1.2.2.2 yamt * Redistribution and use in source and binary forms, with or without 7 1.2.2.2 yamt * modification, are permitted provided that the following conditions 8 1.2.2.2 yamt * are met: 9 1.2.2.2 yamt * 1. Redistributions of source code must retain the above copyright 10 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer. 11 1.2.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 12 1.2.2.2 yamt * notice, this list of conditions and the following disclaimer in the 13 1.2.2.2 yamt * documentation and/or other materials provided with the distribution. 14 1.2.2.2 yamt * 15 1.2.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 16 1.2.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 1.2.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 1.2.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19 1.2.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 1.2.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 1.2.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 1.2.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 1.2.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 1.2.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 1.2.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 26 1.2.2.2 yamt */ 27 1.2.2.2 yamt 28 1.2.2.2 yamt #include <sys/cdefs.h> 29 1.2.2.2 yamt __RCSID("$NetBSD"); 30 1.2.2.2 yamt 31 1.2.2.2 yamt #include <ucontext.h> 32 1.2.2.2 yamt #include <stdio.h> 33 1.2.2.2 yamt #include <stdlib.h> 34 1.2.2.2 yamt #include <lwp.h> 35 1.2.2.2 yamt 36 1.2.2.2 yamt #include <atf-c.h> 37 1.2.2.2 yamt 38 1.2.2.2 yamt #define STACKSIZE 65536 39 1.2.2.2 yamt 40 1.2.2.2 yamt char stack[STACKSIZE]; 41 1.2.2.2 yamt ucontext_t nctx; 42 1.2.2.2 yamt ucontext_t octx; 43 1.2.2.2 yamt void *otls; 44 1.2.2.2 yamt void *ntls; 45 1.2.2.2 yamt int val1, val2; 46 1.2.2.2 yamt int alter_tlsbase; 47 1.2.2.2 yamt 48 1.2.2.2 yamt /* ARGSUSED0 */ 49 1.2.2.2 yamt static void 50 1.2.2.2 yamt swapfunc(void *arg) 51 1.2.2.2 yamt { 52 1.2.2.2 yamt ntls = _lwp_getprivate(); 53 1.2.2.2 yamt printf("after swapcontext TLS pointer = %p\n", ntls); 54 1.2.2.2 yamt 55 1.2.2.2 yamt if (alter_tlsbase) { 56 1.2.2.2 yamt ATF_REQUIRE_EQ(ntls, &val1); 57 1.2.2.2 yamt printf("TLS pointer modified by swapcontext()\n"); 58 1.2.2.2 yamt } else { 59 1.2.2.2 yamt ATF_REQUIRE_EQ(ntls, &val2); 60 1.2.2.2 yamt printf("TLS pointer left untouched by swapcontext()\n"); 61 1.2.2.2 yamt } 62 1.2.2.2 yamt 63 1.2.2.2 yamt /* Go back in main */ 64 1.2.2.2 yamt ATF_REQUIRE(swapcontext(&nctx, &octx)); 65 1.2.2.2 yamt 66 1.2.2.2 yamt /* NOTREACHED */ 67 1.2.2.2 yamt return; 68 1.2.2.2 yamt } 69 1.2.2.2 yamt 70 1.2.2.2 yamt static void 71 1.2.2.2 yamt mainfunc(void) 72 1.2.2.2 yamt { 73 1.2.2.2 yamt printf("Testing if swapcontext() alters TLS pointer if _UC_TLSBASE " 74 1.2.2.2 yamt "is %s\n", (alter_tlsbase) ? "left set" : "cleared"); 75 1.2.2.2 yamt 76 1.2.2.2 yamt _lwp_setprivate(&val1); 77 1.2.2.2 yamt printf("before swapcontext TLS pointer = %p\n", &val1); 78 1.2.2.2 yamt 79 1.2.2.2 yamt ATF_REQUIRE(getcontext(&nctx) == 0); 80 1.2.2.2 yamt 81 1.2.2.2 yamt nctx.uc_stack.ss_sp = stack; 82 1.2.2.2 yamt nctx.uc_stack.ss_size = sizeof(stack); 83 1.2.2.2 yamt 84 1.2.2.2 yamt #ifndef _UC_TLSBASE 85 1.2.2.2 yamt ATF_REQUIRE_MSG(0, "_UC_TLSBASE is not defined"); 86 1.2.2.2 yamt #else /* _UC_TLSBASE */ 87 1.2.2.2 yamt ATF_REQUIRE(nctx.uc_flags & _UC_TLSBASE); 88 1.2.2.2 yamt if (!alter_tlsbase) 89 1.2.2.2 yamt nctx.uc_flags &= ~_UC_TLSBASE; 90 1.2.2.2 yamt #endif /* _UC_TLSBASE */ 91 1.2.2.2 yamt 92 1.2.2.2 yamt makecontext(&nctx, swapfunc, 0); 93 1.2.2.2 yamt 94 1.2.2.2 yamt _lwp_setprivate(&val2); 95 1.2.2.2 yamt otls = _lwp_getprivate(); 96 1.2.2.2 yamt printf("before swapcontext TLS pointer = %p\n", otls); 97 1.2.2.2 yamt ATF_REQUIRE(swapcontext(&octx, &nctx) == 0); 98 1.2.2.2 yamt 99 1.2.2.2 yamt printf("Test completed\n"); 100 1.2.2.2 yamt } 101 1.2.2.2 yamt 102 1.2.2.2 yamt 103 1.2.2.2 yamt ATF_TC(swapcontext1); 104 1.2.2.2 yamt ATF_TC_HEAD(swapcontext1, tc) 105 1.2.2.2 yamt { 106 1.2.2.2 yamt atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can let " 107 1.2.2.2 yamt "TLS pointer untouched"); 108 1.2.2.2 yamt } 109 1.2.2.2 yamt ATF_TC_BODY(swapcontext1, tc) 110 1.2.2.2 yamt { 111 1.2.2.2 yamt alter_tlsbase = 0; 112 1.2.2.2 yamt mainfunc(); 113 1.2.2.2 yamt } 114 1.2.2.2 yamt 115 1.2.2.2 yamt ATF_TC(swapcontext2); 116 1.2.2.2 yamt ATF_TC_HEAD(swapcontext2, tc) 117 1.2.2.2 yamt { 118 1.2.2.2 yamt atf_tc_set_md_var(tc, "descr", "Testing if swapcontext() can " 119 1.2.2.2 yamt "modify TLS pointer"); 120 1.2.2.2 yamt } 121 1.2.2.2 yamt ATF_TC_BODY(swapcontext2, tc) 122 1.2.2.2 yamt { 123 1.2.2.2 yamt alter_tlsbase = 1; 124 1.2.2.2 yamt mainfunc(); 125 1.2.2.2 yamt } 126 1.2.2.2 yamt 127 1.2.2.2 yamt ATF_TP_ADD_TCS(tp) 128 1.2.2.2 yamt { 129 1.2.2.2 yamt ATF_TP_ADD_TC(tp, swapcontext1); 130 1.2.2.2 yamt ATF_TP_ADD_TC(tp, swapcontext2); 131 1.2.2.2 yamt 132 1.2.2.2 yamt return atf_no_error(); 133 1.2.2.2 yamt } 134
Indexes created Fri Oct 03 02:09:57 GMT 2025