t___sync_lock.c revision 1.2
1 /* $NetBSD: t___sync_lock.c,v 1.2 2025/04/07 01:34:43 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2019 Tetsuya Isaki. 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __RCSID("$NetBSD: t___sync_lock.c,v 1.2 2025/04/07 01:34:43 riastradh Exp $"); 30 31 #include <atf-c.h> 32 #include <inttypes.h> 33 #include <machine/types.h> // for __HAVE_ATOMIC64_OPS 34 35 /* 36 * These tests don't examine the atomicity. 37 */ 38 39 /* XXX 40 * Depending on a combination of arch and compiler, __sync_* is 41 * implemented as compiler's builtin function. In that case, even 42 * if libc exports the function symbol, it is not used. As a result 43 * this tests will examine compiler's builtin functions. 44 * It's better to run only when target is actually in libc. 45 */ 46 47 #if defined __vax__ 48 /* 49 * On VAX, __sync_lock_test_and_set_* test and set the low-order bit 50 * with BBSSI, and __sync_lock_release_* clear the low-order bit with 51 * BBCCI, so the other bits are not relevant. 52 * 53 * It is possible that, by using values other than 0 and 1, we are 54 * relying on more than gcc guarantees about __sync_lock_test_and_set_* 55 * and __sync_lock_release_*. But, well, if so, we will be alerted by 56 * a failing test. 57 */ 58 #define INITVAL 0x1122334455667788 59 #define LOCKVAL 1 60 #define LOCKRET 0 61 #define LOCKEDVAL 0x1122334455667789 62 #define UNLOCKEDVAL 0x1122334455667788 63 #elif 0 && defined __hppa__ 64 /* 65 * On HPPA, the native atomic r/m/w instruction, LDCW, atomically loads 66 * a word and clears it, so the obvious choice is for the unlocked 67 * state to be nonzero and the locked state to be zero. 68 * 69 * But gcc doesn't do that. 70 * 71 * Instead, it uses zero for unlocked and nonzero for locked. So for 72 * __sync_lock_test_and_set_* it issues an out-of-line call (which on 73 * NetBSD implements by atomic_swap_N), and for __sync_lock_release_*, 74 * it issues LDCW on a scratch stack location only as a barrier and 75 * then issues STW to store a zero. 76 * 77 * So we don't use this branch after all. But I'm leaving it here as a 78 * reminder to anyone who suspects something might be wrong on HPPA. 79 */ 80 #define INITVAL 0x1122334455667788 81 #define LOCKVAL 0 82 #define LOCKRET 0x1122334455667788 83 #define LOCKEDVAL 0 84 #define UNLOCKEDVAL 1 85 #else 86 /* 87 * According to GCC documentation at 88 * <https://gcc.gnu.org/onlinedocs/gcc-12.4.0/gcc/_005f_005fsync-Builtins.html>, 89 * the only guaranteed supported value for LOCKVAL is 1, and it is not 90 * guaranteed that __sync_lock_release_* stores zero. But on many 91 * architectures other values work too, and __sync_lock_release_* does 92 * just store zero, so let's test these by default; the exceptions can 93 * be listed above. 94 */ 95 #define INITVAL 0x1122334455667788 96 #define LOCKVAL 0x8090a0b0c0d0e0f0 97 #define LOCKRET 0x1122334455667788 98 #define LOCKEDVAL 0x8090a0b0c0d0e0f0 99 #define UNLOCKEDVAL 0 100 #endif 101 102 #define atf_sync_tas(NAME, TYPE, FMT) \ 103 ATF_TC(NAME); \ 104 ATF_TC_HEAD(NAME, tc) \ 105 { \ 106 atf_tc_set_md_var(tc, "descr", #NAME); \ 107 } \ 108 ATF_TC_BODY(NAME, tc) \ 109 { \ 110 volatile TYPE val; \ 111 TYPE newval; \ 112 TYPE expval; \ 113 TYPE expres; \ 114 TYPE res; \ 115 val = (TYPE)INITVAL; \ 116 newval = (TYPE)LOCKVAL; \ 117 expval = (TYPE)LOCKEDVAL; \ 118 expres = (TYPE)LOCKRET; \ 119 res = NAME(&val, newval); \ 120 ATF_REQUIRE_MSG(val == expval, \ 121 "val expects 0x%" FMT " but 0x%" FMT, expval, val); \ 122 ATF_REQUIRE_MSG(res == expres, \ 123 "res expects 0x%" FMT " but 0x%" FMT, expres, res); \ 124 } 125 126 atf_sync_tas(__sync_lock_test_and_set_1, uint8_t, PRIx8); 127 atf_sync_tas(__sync_lock_test_and_set_2, uint16_t, PRIx16); 128 atf_sync_tas(__sync_lock_test_and_set_4, uint32_t, PRIx32); 129 #ifdef __HAVE_ATOMIC64_OPS 130 atf_sync_tas(__sync_lock_test_and_set_8, uint64_t, PRIx64); 131 #endif 132 133 #define atf_sync_rel(NAME, TYPE, FMT) \ 134 ATF_TC(NAME); \ 135 ATF_TC_HEAD(NAME, tc) \ 136 { \ 137 atf_tc_set_md_var(tc, "descr", #NAME); \ 138 } \ 139 ATF_TC_BODY(NAME, tc) \ 140 { \ 141 volatile TYPE val; \ 142 TYPE expval; \ 143 val = (TYPE)LOCKEDVAL; \ 144 expval = (TYPE)UNLOCKEDVAL; \ 145 NAME(&val); \ 146 ATF_REQUIRE_MSG(val == expval, \ 147 "val expects 0x%" FMT " but 0x%" FMT, expval, val); \ 148 } 149 150 atf_sync_rel(__sync_lock_release_1, uint8_t, PRIx8); 151 atf_sync_rel(__sync_lock_release_2, uint16_t, PRIx16); 152 atf_sync_rel(__sync_lock_release_4, uint32_t, PRIx32); 153 #ifdef __HAVE_ATOMIC64_OPS 154 atf_sync_rel(__sync_lock_release_8, uint64_t, PRIx64); 155 #endif 156 157 /* 158 * __sync_synchronize(): This is just a link-time test. 159 */ 160 ATF_TC(__sync_synchronize); 161 ATF_TC_HEAD(__sync_synchronize, tc) 162 { 163 atf_tc_set_md_var(tc, "descr", "__sync_synchronize"); 164 } 165 ATF_TC_BODY(__sync_synchronize, tc) 166 { 167 __sync_synchronize(); 168 } 169 170 ATF_TP_ADD_TCS(tp) 171 { 172 ATF_TP_ADD_TC(tp, __sync_lock_test_and_set_1); 173 ATF_TP_ADD_TC(tp, __sync_lock_test_and_set_2); 174 ATF_TP_ADD_TC(tp, __sync_lock_test_and_set_4); 175 #ifdef __HAVE_ATOMIC64_OPS 176 ATF_TP_ADD_TC(tp, __sync_lock_test_and_set_8); 177 #endif 178 179 ATF_TP_ADD_TC(tp, __sync_lock_release_1); 180 ATF_TP_ADD_TC(tp, __sync_lock_release_2); 181 ATF_TP_ADD_TC(tp, __sync_lock_release_4); 182 #ifdef __HAVE_ATOMIC64_OPS 183 ATF_TP_ADD_TC(tp, __sync_lock_release_8); 184 #endif 185 186 ATF_TP_ADD_TC(tp, __sync_synchronize); 187 188 return atf_no_error(); 189 } 190
Indexes created Tue Sep 30 17:09:57 GMT 2025