strace.c (9391B)
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 #include <ctype.h> 24 25 #include "qemu.h" 26 27 #include "os-strace.h" /* OS dependent strace print functions */ 28 29 int do_strace; 30 31 /* 32 * Utility functions 33 */ 34 static const char * 35 get_comma(int last) 36 { 37 return (last) ? "" : ","; 38 } 39 40 /* 41 * Prints out raw parameter using given format. Caller needs 42 * to do byte swapping if needed. 43 */ 44 static void 45 print_raw_param(const char *fmt, abi_long param, int last) 46 { 47 char format[64]; 48 49 (void)snprintf(format, sizeof(format), "%s%s", fmt, get_comma(last)); 50 gemu_log(format, param); 51 } 52 53 static void print_sysctl(const struct syscallname *name, abi_long arg1, 54 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 55 abi_long arg6) 56 { 57 uint32_t i; 58 int32_t *namep; 59 60 gemu_log("%s({ ", name->name); 61 namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1); 62 if (namep) { 63 int32_t *p = namep; 64 65 for (i = 0; i < (uint32_t)arg2; i++) { 66 gemu_log("%d ", tswap32(*p++)); 67 } 68 unlock_user(namep, arg1, 0); 69 } 70 gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x" 71 TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")", 72 (uint32_t)arg2, arg3, arg4, arg5, arg6); 73 } 74 75 static void print_execve(const struct syscallname *name, abi_long arg1, 76 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 77 abi_long arg6) 78 { 79 abi_ulong arg_ptr_addr; 80 char *s; 81 82 s = lock_user_string(arg1); 83 if (s == NULL) { 84 return; 85 } 86 gemu_log("%s(\"%s\",{", name->name, s); 87 unlock_user(s, arg1, 0); 88 89 for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) { 90 abi_ulong *arg_ptr, arg_addr; 91 92 arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1); 93 if (!arg_ptr) { 94 return; 95 } 96 arg_addr = tswapl(*arg_ptr); 97 unlock_user(arg_ptr, arg_ptr_addr, 0); 98 if (!arg_addr) { 99 break; 100 } 101 if ((s = lock_user_string(arg_addr))) { 102 gemu_log("\"%s\",", s); 103 unlock_user(s, arg_addr, 0); 104 } 105 } 106 gemu_log("NULL})"); 107 } 108 109 static void print_ioctl(const struct syscallname *name, 110 abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, 111 abi_long arg5, abi_long arg6) 112 { 113 /* Decode the ioctl request */ 114 gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x" 115 TARGET_ABI_FMT_lx ", ...)", 116 name->name, 117 (int)arg1, 118 (unsigned long)arg2, 119 arg2 & IOC_OUT ? "R" : "", 120 arg2 & IOC_IN ? "W" : "", 121 (unsigned)IOCGROUP(arg2), 122 isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?', 123 (int)arg2 & 0xFF, 124 (int)IOCPARM_LEN(arg2), 125 arg3); 126 } 127 128 static void print_sysarch(const struct syscallname *name, abi_long arg1, 129 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 130 abi_long arg6) 131 { 132 /* This is os dependent. */ 133 do_os_print_sysarch(name, arg1, arg2, arg3, arg4, arg5, arg6); 134 } 135 136 /* 137 * Variants for the return value output function 138 */ 139 140 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret) 141 { 142 if (ret == -1) { 143 gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno)); 144 } else { 145 gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); 146 } 147 } 148 149 /* 150 * An array of all of the syscalls we know about 151 */ 152 153 static const struct syscallname freebsd_scnames[] = { 154 #include "freebsd/strace.list" 155 }; 156 static const struct syscallname netbsd_scnames[] = { 157 #include "netbsd/strace.list" 158 }; 159 static const struct syscallname openbsd_scnames[] = { 160 #include "openbsd/strace.list" 161 }; 162 163 static void print_syscall(int num, const struct syscallname *scnames, 164 unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3, 165 abi_long arg4, abi_long arg5, abi_long arg6) 166 { 167 unsigned int i; 168 const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 169 TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 170 TARGET_ABI_FMT_ld ")"; 171 172 gemu_log("%d ", getpid() ); 173 174 for (i = 0; i < nscnames; i++) { 175 if (scnames[i].nr == num) { 176 if (scnames[i].call != NULL) { 177 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5, 178 arg6); 179 } else { 180 /* XXX: this format system is broken because it uses 181 host types and host pointers for strings */ 182 if (scnames[i].format != NULL) { 183 format = scnames[i].format; 184 } 185 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5, 186 arg6); 187 } 188 return; 189 } 190 } 191 gemu_log("Unknown syscall %d\n", num); 192 } 193 194 static void print_syscall_ret(int num, abi_long ret, 195 const struct syscallname *scnames, unsigned int nscnames) 196 { 197 unsigned int i; 198 199 for (i = 0; i < nscnames; i++) { 200 if (scnames[i].nr == num) { 201 if (scnames[i].result != NULL) { 202 scnames[i].result(&scnames[i], ret); 203 } else { 204 if (ret < 0) { 205 gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, 206 strerror(-ret)); 207 } else { 208 gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret); 209 } 210 } 211 break; 212 } 213 } 214 } 215 216 /* 217 * The public interface to this module. 218 */ 219 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 220 abi_long arg4, abi_long arg5, abi_long arg6) 221 { 222 223 print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2, 224 arg3, arg4, arg5, arg6); 225 } 226 227 void print_freebsd_syscall_ret(int num, abi_long ret) 228 { 229 230 print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames)); 231 } 232 233 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 234 abi_long arg4, abi_long arg5, abi_long arg6) 235 { 236 237 print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames), 238 arg1, arg2, arg3, arg4, arg5, arg6); 239 } 240 241 void print_netbsd_syscall_ret(int num, abi_long ret) 242 { 243 244 print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames)); 245 } 246 247 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 248 abi_long arg4, abi_long arg5, abi_long arg6) 249 { 250 251 print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2, 252 arg3, arg4, arg5, arg6); 253 } 254 255 void print_openbsd_syscall_ret(int num, abi_long ret) 256 { 257 258 print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames)); 259 } 260 261 static void 262 print_signal(abi_ulong arg, int last) 263 { 264 const char *signal_name = NULL; 265 switch (arg) { 266 case TARGET_SIGHUP: 267 signal_name = "SIGHUP"; 268 break; 269 case TARGET_SIGINT: 270 signal_name = "SIGINT"; 271 break; 272 case TARGET_SIGQUIT: 273 signal_name = "SIGQUIT"; 274 break; 275 case TARGET_SIGILL: 276 signal_name = "SIGILL"; 277 break; 278 case TARGET_SIGABRT: 279 signal_name = "SIGABRT"; 280 break; 281 case TARGET_SIGFPE: 282 signal_name = "SIGFPE"; 283 break; 284 case TARGET_SIGKILL: 285 signal_name = "SIGKILL"; 286 break; 287 case TARGET_SIGSEGV: 288 signal_name = "SIGSEGV"; 289 break; 290 case TARGET_SIGPIPE: 291 signal_name = "SIGPIPE"; 292 break; 293 case TARGET_SIGALRM: 294 signal_name = "SIGALRM"; 295 break; 296 case TARGET_SIGTERM: 297 signal_name = "SIGTERM"; 298 break; 299 case TARGET_SIGUSR1: 300 signal_name = "SIGUSR1"; 301 break; 302 case TARGET_SIGUSR2: 303 signal_name = "SIGUSR2"; 304 break; 305 case TARGET_SIGCHLD: 306 signal_name = "SIGCHLD"; 307 break; 308 case TARGET_SIGCONT: 309 signal_name = "SIGCONT"; 310 break; 311 case TARGET_SIGSTOP: 312 signal_name = "SIGSTOP"; 313 break; 314 case TARGET_SIGTTIN: 315 signal_name = "SIGTTIN"; 316 break; 317 case TARGET_SIGTTOU: 318 signal_name = "SIGTTOU"; 319 break; 320 } 321 if (signal_name == NULL) { 322 print_raw_param("%ld", arg, last); 323 return; 324 } 325 gemu_log("%s%s", signal_name, get_comma(last)); 326 } 327 328 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo) 329 { 330 /* 331 * Print the strace output for a signal being taken: 332 * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} --- 333 */ 334 gemu_log("%d ", getpid()); 335 gemu_log("--- "); 336 print_signal(target_signum, 1); 337 gemu_log(" ---\n"); 338 }