1 /* 2 * System call tracing and debugging 3 * 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 #include <sys/select.h> 21 #include <sys/syscall.h> 22 #include <sys/ioccom.h> 23 24 #include "qemu.h" 25 26 #include "os-strace.h" /* OS dependent strace print functions */ 27 28 int do_strace; 29 30 /* 31 * Utility functions 32 */ 33 static const char * 34 get_comma(int last) 35 { 36 return (last) ? "" : ","; 37 } 38 39 /* 40 * Prints out raw parameter using given format. Caller needs 41 * to do byte swapping if needed. 42 */ 43 static void 44 print_raw_param(const char *fmt, abi_long param, int last) 45 { 46 char format[64]; 47 48 (void)snprintf(format, sizeof(format), "%s%s", fmt, get_comma(last)); 49 gemu_log(format, param); 50 } 51 52 static void print_sysctl(const struct syscallname *name, abi_long arg1, 53 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 54 abi_long arg6) 55 { 56 uint32_t i; 57 int32_t *namep; 58 59 gemu_log("%s({ ", name->name); 60 namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1); 61 if (namep) { 62 int32_t *p = namep; 63 64 for (i = 0; i < (uint32_t)arg2; i++) { 65 gemu_log("%d ", tswap32(*p++)); 66 } 67 unlock_user(namep, arg1, 0); 68 } 69 gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x" 70 TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")", 71 (uint32_t)arg2, arg3, arg4, arg5, arg6); 72 } 73 74 static void print_execve(const struct syscallname *name, abi_long arg1, 75 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 76 abi_long arg6) 77 { 78 abi_ulong arg_ptr_addr; 79 char *s; 80 81 s = lock_user_string(arg1); 82 if (s == NULL) { 83 return; 84 } 85 gemu_log("%s(\"%s\",{", name->name, s); 86 unlock_user(s, arg1, 0); 87 88 for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) { 89 abi_ulong *arg_ptr, arg_addr; 90 91 arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1); 92 if (!arg_ptr) { 93 return; 94 } 95 arg_addr = tswapl(*arg_ptr); 96 unlock_user(arg_ptr, arg_ptr_addr, 0); 97 if (!arg_addr) { 98 break; 99 } 100 if ((s = lock_user_string(arg_addr))) { 101 gemu_log("\"%s\",", s); 102 unlock_user(s, arg_addr, 0); 103 } 104 } 105 gemu_log("NULL})"); 106 } 107 108 static void print_ioctl(const struct syscallname *name, 109 abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, 110 abi_long arg5, abi_long arg6) 111 { 112 /* Decode the ioctl request */ 113 gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x" 114 TARGET_ABI_FMT_lx ", ...)", 115 name->name, 116 (int)arg1, 117 (unsigned long)arg2, 118 arg2 & IOC_OUT ? "R" : "", 119 arg2 & IOC_IN ? "W" : "", 120 (unsigned)IOCGROUP(arg2), 121 isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?', 122 (int)arg2 & 0xFF, 123 (int)IOCPARM_LEN(arg2), 124 arg3); 125 } 126 127 static void print_sysarch(const struct syscallname *name, abi_long arg1, 128 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 129 abi_long arg6) 130 { 131 /* This is os dependent. */ 132 do_os_print_sysarch(name, arg1, arg2, arg3, arg4, arg5, arg6); 133 } 134 135 /* 136 * Variants for the return value output function 137 */ 138 139 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret) 140 { 141 if (ret == -1) { 142 gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno)); 143 } else { 144 gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); 145 } 146 } 147 148 /* 149 * An array of all of the syscalls we know about 150 */ 151 152 static const struct syscallname freebsd_scnames[] = { 153 #include "freebsd/strace.list" 154 }; 155 static const struct syscallname netbsd_scnames[] = { 156 #include "netbsd/strace.list" 157 }; 158 static const struct syscallname openbsd_scnames[] = { 159 #include "openbsd/strace.list" 160 }; 161 162 static void print_syscall(int num, const struct syscallname *scnames, 163 unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3, 164 abi_long arg4, abi_long arg5, abi_long arg6) 165 { 166 unsigned int i; 167 const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 168 TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 169 TARGET_ABI_FMT_ld ")"; 170 171 gemu_log("%d ", getpid() ); 172 173 for (i = 0; i < nscnames; i++) { 174 if (scnames[i].nr == num) { 175 if (scnames[i].call != NULL) { 176 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5, 177 arg6); 178 } else { 179 /* XXX: this format system is broken because it uses 180 host types and host pointers for strings */ 181 if (scnames[i].format != NULL) { 182 format = scnames[i].format; 183 } 184 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5, 185 arg6); 186 } 187 return; 188 } 189 } 190 gemu_log("Unknown syscall %d\n", num); 191 } 192 193 static void print_syscall_ret(int num, abi_long ret, 194 const struct syscallname *scnames, unsigned int nscnames) 195 { 196 unsigned int i; 197 198 for (i = 0; i < nscnames; i++) { 199 if (scnames[i].nr == num) { 200 if (scnames[i].result != NULL) { 201 scnames[i].result(&scnames[i], ret); 202 } else { 203 if (ret < 0) { 204 gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, 205 strerror(-ret)); 206 } else { 207 gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret); 208 } 209 } 210 break; 211 } 212 } 213 } 214 215 /* 216 * The public interface to this module. 217 */ 218 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 219 abi_long arg4, abi_long arg5, abi_long arg6) 220 { 221 222 print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2, 223 arg3, arg4, arg5, arg6); 224 } 225 226 void print_freebsd_syscall_ret(int num, abi_long ret) 227 { 228 229 print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames)); 230 } 231 232 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 233 abi_long arg4, abi_long arg5, abi_long arg6) 234 { 235 236 print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames), 237 arg1, arg2, arg3, arg4, arg5, arg6); 238 } 239 240 void print_netbsd_syscall_ret(int num, abi_long ret) 241 { 242 243 print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames)); 244 } 245 246 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 247 abi_long arg4, abi_long arg5, abi_long arg6) 248 { 249 250 print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2, 251 arg3, arg4, arg5, arg6); 252 } 253 254 void print_openbsd_syscall_ret(int num, abi_long ret) 255 { 256 257 print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames)); 258 } 259 260 static void 261 print_signal(abi_ulong arg, int last) 262 { 263 const char *signal_name = NULL; 264 switch (arg) { 265 case TARGET_SIGHUP: 266 signal_name = "SIGHUP"; 267 break; 268 case TARGET_SIGINT: 269 signal_name = "SIGINT"; 270 break; 271 case TARGET_SIGQUIT: 272 signal_name = "SIGQUIT"; 273 break; 274 case TARGET_SIGILL: 275 signal_name = "SIGILL"; 276 break; 277 case TARGET_SIGABRT: 278 signal_name = "SIGABRT"; 279 break; 280 case TARGET_SIGFPE: 281 signal_name = "SIGFPE"; 282 break; 283 case TARGET_SIGKILL: 284 signal_name = "SIGKILL"; 285 break; 286 case TARGET_SIGSEGV: 287 signal_name = "SIGSEGV"; 288 break; 289 case TARGET_SIGPIPE: 290 signal_name = "SIGPIPE"; 291 break; 292 case TARGET_SIGALRM: 293 signal_name = "SIGALRM"; 294 break; 295 case TARGET_SIGTERM: 296 signal_name = "SIGTERM"; 297 break; 298 case TARGET_SIGUSR1: 299 signal_name = "SIGUSR1"; 300 break; 301 case TARGET_SIGUSR2: 302 signal_name = "SIGUSR2"; 303 break; 304 case TARGET_SIGCHLD: 305 signal_name = "SIGCHLD"; 306 break; 307 case TARGET_SIGCONT: 308 signal_name = "SIGCONT"; 309 break; 310 case TARGET_SIGSTOP: 311 signal_name = "SIGSTOP"; 312 break; 313 case TARGET_SIGTTIN: 314 signal_name = "SIGTTIN"; 315 break; 316 case TARGET_SIGTTOU: 317 signal_name = "SIGTTOU"; 318 break; 319 } 320 if (signal_name == NULL) { 321 print_raw_param("%ld", arg, last); 322 return; 323 } 324 gemu_log("%s%s", signal_name, get_comma(last)); 325 } 326 327 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo) 328 { 329 /* 330 * Print the strace output for a signal being taken: 331 * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- 332 */ 333 gemu_log("%d ", getpid()); 334 gemu_log("--- "); 335 print_signal(target_signum, 1); 336 gemu_log(" ---\n"); 337 } 338