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 int do_strace; 27 28 /* 29 * Utility functions 30 */ 31 32 static void print_sysctl(const struct syscallname *name, abi_long arg1, 33 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 34 abi_long arg6) 35 { 36 uint32_t i; 37 int32_t *namep; 38 39 gemu_log("%s({ ", name->name); 40 namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1); 41 if (namep) { 42 int32_t *p = namep; 43 44 for (i = 0; i < (uint32_t)arg2; i++) { 45 gemu_log("%d ", tswap32(*p++)); 46 } 47 unlock_user(namep, arg1, 0); 48 } 49 gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x" 50 TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")", 51 (uint32_t)arg2, arg3, arg4, arg5, arg6); 52 } 53 54 static void print_execve(const struct syscallname *name, abi_long arg1, 55 abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, 56 abi_long arg6) 57 { 58 abi_ulong arg_ptr_addr; 59 char *s; 60 61 s = lock_user_string(arg1); 62 if (s == NULL) { 63 return; 64 } 65 gemu_log("%s(\"%s\",{", name->name, s); 66 unlock_user(s, arg1, 0); 67 68 for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) { 69 abi_ulong *arg_ptr, arg_addr; 70 71 arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1); 72 if (!arg_ptr) { 73 return; 74 } 75 arg_addr = tswapl(*arg_ptr); 76 unlock_user(arg_ptr, arg_ptr_addr, 0); 77 if (!arg_addr) { 78 break; 79 } 80 if ((s = lock_user_string(arg_addr))) { 81 gemu_log("\"%s\",", s); 82 unlock_user(s, arg_addr, 0); 83 } 84 } 85 gemu_log("NULL})"); 86 } 87 88 static void print_ioctl(const struct syscallname *name, 89 abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4, 90 abi_long arg5, abi_long arg6) 91 { 92 /* Decode the ioctl request */ 93 gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x" 94 TARGET_ABI_FMT_lx ", ...)", 95 name->name, 96 (int)arg1, 97 (unsigned long)arg2, 98 arg2 & IOC_OUT ? "R" : "", 99 arg2 & IOC_IN ? "W" : "", 100 (unsigned)IOCGROUP(arg2), 101 isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?', 102 (int)arg2 & 0xFF, 103 (int)IOCPARM_LEN(arg2), 104 arg3); 105 } 106 107 /* 108 * Variants for the return value output function 109 */ 110 111 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret) 112 { 113 if (ret == -1) { 114 gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno)); 115 } else { 116 gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); 117 } 118 } 119 120 #if 0 /* currently unused */ 121 static void 122 print_syscall_ret_raw(struct syscallname *name, abi_long ret) 123 { 124 gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret); 125 } 126 #endif 127 128 /* 129 * An array of all of the syscalls we know about 130 */ 131 132 static const struct syscallname freebsd_scnames[] = { 133 #include "freebsd/strace.list" 134 }; 135 static const struct syscallname netbsd_scnames[] = { 136 #include "netbsd/strace.list" 137 }; 138 static const struct syscallname openbsd_scnames[] = { 139 #include "openbsd/strace.list" 140 }; 141 142 static void print_syscall(int num, const struct syscallname *scnames, 143 unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3, 144 abi_long arg4, abi_long arg5, abi_long arg6) 145 { 146 unsigned int i; 147 const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 148 TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," 149 TARGET_ABI_FMT_ld ")"; 150 151 gemu_log("%d ", getpid() ); 152 153 for (i = 0; i < nscnames; i++) { 154 if (scnames[i].nr == num) { 155 if (scnames[i].call != NULL) { 156 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5, 157 arg6); 158 } else { 159 /* XXX: this format system is broken because it uses 160 host types and host pointers for strings */ 161 if (scnames[i].format != NULL) { 162 format = scnames[i].format; 163 } 164 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5, 165 arg6); 166 } 167 return; 168 } 169 } 170 gemu_log("Unknown syscall %d\n", num); 171 } 172 173 static void print_syscall_ret(int num, abi_long ret, 174 const struct syscallname *scnames, unsigned int nscnames) 175 { 176 unsigned int i; 177 178 for (i = 0; i < nscnames; i++) { 179 if (scnames[i].nr == num) { 180 if (scnames[i].result != NULL) { 181 scnames[i].result(&scnames[i], ret); 182 } else { 183 if (ret < 0) { 184 gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, 185 strerror(-ret)); 186 } else { 187 gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret); 188 } 189 } 190 break; 191 } 192 } 193 } 194 195 /* 196 * The public interface to this module. 197 */ 198 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 199 abi_long arg4, abi_long arg5, abi_long arg6) 200 { 201 202 print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2, 203 arg3, arg4, arg5, arg6); 204 } 205 206 void print_freebsd_syscall_ret(int num, abi_long ret) 207 { 208 209 print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames)); 210 } 211 212 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 213 abi_long arg4, abi_long arg5, abi_long arg6) 214 { 215 216 print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames), 217 arg1, arg2, arg3, arg4, arg5, arg6); 218 } 219 220 void print_netbsd_syscall_ret(int num, abi_long ret) 221 { 222 223 print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames)); 224 } 225 226 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3, 227 abi_long arg4, abi_long arg5, abi_long arg6) 228 { 229 230 print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2, 231 arg3, arg4, arg5, arg6); 232 } 233 234 void print_openbsd_syscall_ret(int num, abi_long ret) 235 { 236 237 print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames)); 238 } 239