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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 | } |