1 /*- 2 * Copyright (c) 2021 M. Warner Losh <imp@FreeBSD.org> 3 * 4 * SPDX-License-Identifier: BSD-2-Clause 5 */ 6 7 #include <atf-c.h> 8 #include <errno.h> 9 #include <signal.h> 10 #include <stdbool.h> 11 #include <stdlib.h> 12 13 #if defined(__aarch64__) 14 #include <machine/armreg.h> 15 #define SET_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_gpregs.gp_spsr |= PSR_SS 16 #define CLR_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_gpregs.gp_spsr &= ~PSR_SS 17 #elif defined(__amd64__) 18 #include <machine/psl.h> 19 #define SET_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_rflags |= PSL_T 20 #define CLR_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_rflags &= ~PSL_T 21 #elif defined(__i386__) 22 #include <machine/psl.h> 23 #define SET_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_eflags |= PSL_T 24 #define CLR_TRACE_FLAG(ucp) (ucp)->uc_mcontext.mc_eflags &= ~PSL_T 25 #endif 26 27 static volatile sig_atomic_t signal_fired = 0; 28 29 static void 30 sig_handler(int signo, siginfo_t *info __unused, void *ucp __unused) 31 { 32 signal_fired++; 33 } 34 35 ATF_TC(signal_test); 36 37 ATF_TC_HEAD(signal_test, tc) 38 { 39 40 atf_tc_set_md_var(tc, "descr", "Testing delivery of a signal"); 41 } 42 43 ATF_TC_BODY(signal_test, tc) 44 { 45 /* 46 * Setup the signal handlers 47 */ 48 struct sigaction sa = { 49 .sa_sigaction = sig_handler, 50 .sa_flags = SA_SIGINFO, 51 }; 52 ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0); 53 ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0); 54 ATF_REQUIRE(sigaction(SIGUSR2, &sa, NULL) == 0); 55 ATF_REQUIRE(sigaction(SIGALRM, &sa, NULL) == 0); 56 57 /* 58 * Fire SIGUSR1 59 */ 60 ATF_CHECK(signal_fired == 0); 61 ATF_REQUIRE(raise(SIGUSR1) == 0); 62 ATF_CHECK(signal_fired == 1); 63 64 /* 65 * Fire SIGUSR2 66 */ 67 ATF_REQUIRE(raise(SIGUSR2) == 0); 68 ATF_CHECK(signal_fired == 2); 69 70 /* 71 * Fire SIGALRM after a timeout 72 */ 73 ATF_REQUIRE(alarm(1) == 0); 74 ATF_REQUIRE(pause() == -1); 75 ATF_REQUIRE(errno == EINTR); 76 ATF_CHECK(signal_fired == 3); 77 } 78 79 /* 80 * Check setting the machine dependent single step flag works when supported. 81 */ 82 #ifdef SET_TRACE_FLAG 83 static volatile sig_atomic_t trap_signal_fired = 0; 84 85 static void 86 trap_sig_handler(int signo, siginfo_t *info __unused, void *_ucp) 87 { 88 ucontext_t *ucp = _ucp; 89 90 if (trap_signal_fired < 9) { 91 SET_TRACE_FLAG(ucp); 92 } else { 93 CLR_TRACE_FLAG(ucp); 94 } 95 trap_signal_fired++; 96 } 97 98 ATF_TC(trap_signal_test); 99 100 ATF_TC_HEAD(trap_signal_test, tc) 101 { 102 103 atf_tc_set_md_var(tc, "descr", 104 "Testing signal handler setting the MD single step flag"); 105 } 106 107 ATF_TC_BODY(trap_signal_test, tc) 108 { 109 /* 110 * Setup the signal handlers 111 */ 112 struct sigaction sa = { 113 .sa_sigaction = trap_sig_handler, 114 .sa_flags = SA_SIGINFO, 115 }; 116 ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0); 117 ATF_REQUIRE(sigaction(SIGTRAP, &sa, NULL) == 0); 118 119 /* 120 * Fire SIGTRAP 121 */ 122 ATF_CHECK(trap_signal_fired == 0); 123 ATF_REQUIRE(raise(SIGTRAP) == 0); 124 ATF_CHECK(trap_signal_fired == 10); 125 } 126 #endif 127 128 /* 129 * Special tests for 32-bit arm. We can call thumb code (really just t32) from 130 * normal (a32) mode and vice versa. Likewise, signals can interrupt a T32 131 * context with A32 code and vice versa. Make sure these all work with a simple 132 * test that raises the signal and ensures that it executed. No other platform 133 * has these requirements. Also note: we only support thumb2, so there's no T16 134 * vs T32 issues we have to test for. 135 */ 136 #ifdef __arm__ 137 138 #define a32_isa __attribute__((target("arm"))) 139 #define t32_isa __attribute__((target("thumb"))) 140 141 static volatile sig_atomic_t t32_fired = 0; 142 static volatile sig_atomic_t a32_fired = 0; 143 144 a32_isa static void 145 sig_a32(int signo, siginfo_t *info __unused, void *ucp __unused) 146 { 147 a32_fired++; 148 } 149 150 t32_isa static void 151 sig_t32(int signo, siginfo_t *info __unused, void *ucp __unused) 152 { 153 t32_fired++; 154 } 155 156 157 ATF_TC(signal_test_T32_to_A32); 158 159 ATF_TC_HEAD(signal_test_T32_to_A32, tc) 160 { 161 162 atf_tc_set_md_var(tc, "descr", "Testing delivery of a signal from T32 to A32"); 163 } 164 165 t32_isa ATF_TC_BODY(signal_test_T32_to_A32, tc) 166 { 167 /* 168 * Setup the signal handlers 169 */ 170 struct sigaction sa = { 171 .sa_sigaction = sig_a32, 172 .sa_flags = SA_SIGINFO, 173 }; 174 ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0); 175 ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0); 176 177 ATF_REQUIRE((((uintptr_t)sig_a32) & 1) == 0); /* Make sure compiled as not thumb */ 178 179 ATF_CHECK(a32_fired == 0); 180 ATF_REQUIRE(raise(SIGUSR1) == 0); 181 ATF_CHECK(a32_fired == 1); 182 } 183 184 ATF_TC(signal_test_A32_to_T32); 185 186 ATF_TC_HEAD(signal_test_A32_to_T32, tc) 187 { 188 189 atf_tc_set_md_var(tc, "descr", "Testing delivery of a signal from A32 to T32"); 190 } 191 192 a32_isa ATF_TC_BODY(signal_test_A32_to_T32, tc) 193 { 194 /* 195 * Setup the signal handlers 196 */ 197 struct sigaction sa = { 198 .sa_sigaction = sig_t32, 199 .sa_flags = SA_SIGINFO, 200 }; 201 ATF_REQUIRE(sigemptyset(&sa.sa_mask) == 0); 202 ATF_REQUIRE(sigaction(SIGUSR1, &sa, NULL) == 0); 203 204 ATF_REQUIRE((((uintptr_t)sig_t32) & 1) == 1); /* Make sure compiled as thumb */ 205 206 ATF_CHECK(t32_fired == 0); 207 ATF_REQUIRE(raise(SIGUSR1) == 0); 208 ATF_CHECK(t32_fired == 1); 209 } 210 #endif 211 212 ATF_TP_ADD_TCS(tp) 213 { 214 215 ATF_TP_ADD_TC(tp, signal_test); 216 #ifdef SET_TRACE_FLAG 217 ATF_TP_ADD_TC(tp, trap_signal_test); 218 #endif 219 #ifdef __arm__ 220 ATF_TP_ADD_TC(tp, signal_test_T32_to_A32); 221 ATF_TP_ADD_TC(tp, signal_test_A32_to_T32); 222 #endif 223 224 return (atf_no_error()); 225 } 226