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Sean Bruno88dae462014-06-08 09:57:23 -07001/*
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
Peter Maydell22311972016-01-29 17:49:53 +000019#include "qemu/osdep.h"
blueswir184778502008-10-26 20:33:16 +000020#include <sys/select.h>
blueswir184778502008-10-26 20:33:16 +000021#include <sys/syscall.h>
Sean Bruno88dae462014-06-08 09:57:23 -070022#include <sys/ioccom.h>
Stacey Sonea1ab4c2020-12-18 13:54:50 -070023#include <ctype.h>
Sean Bruno88dae462014-06-08 09:57:23 -070024
blueswir184778502008-10-26 20:33:16 +000025#include "qemu.h"
26
Stacey Sonea1ab4c2020-12-18 13:54:50 -070027#include "os-strace.h" /* OS dependent strace print functions */
28
Sean Bruno88dae462014-06-08 09:57:23 -070029int do_strace;
blueswir184778502008-10-26 20:33:16 +000030
31/*
32 * Utility functions
33 */
Warner Loshfd5bec92022-01-08 20:04:18 -070034static const char *
35get_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 */
44static void
45print_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}
blueswir184778502008-10-26 20:33:16 +000052
Sean Bruno80b34602014-06-08 09:57:24 -070053static 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
Sean Bruno88dae462014-06-08 09:57:23 -070075static 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)
blueswir184778502008-10-26 20:33:16 +000078{
79 abi_ulong arg_ptr_addr;
80 char *s;
81
Sean Bruno88dae462014-06-08 09:57:23 -070082 s = lock_user_string(arg1);
83 if (s == NULL) {
blueswir184778502008-10-26 20:33:16 +000084 return;
Sean Bruno88dae462014-06-08 09:57:23 -070085 }
blueswir184778502008-10-26 20:33:16 +000086 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)) {
Christoph Egger18c9a9c2009-07-17 17:48:03 +000090 abi_ulong *arg_ptr, arg_addr;
blueswir184778502008-10-26 20:33:16 +000091
92 arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
Sean Bruno88dae462014-06-08 09:57:23 -070093 if (!arg_ptr) {
blueswir184778502008-10-26 20:33:16 +000094 return;
Sean Bruno88dae462014-06-08 09:57:23 -070095 }
blueswir184778502008-10-26 20:33:16 +000096 arg_addr = tswapl(*arg_ptr);
97 unlock_user(arg_ptr, arg_ptr_addr, 0);
Sean Bruno88dae462014-06-08 09:57:23 -070098 if (!arg_addr) {
blueswir184778502008-10-26 20:33:16 +000099 break;
Sean Bruno88dae462014-06-08 09:57:23 -0700100 }
blueswir184778502008-10-26 20:33:16 +0000101 if ((s = lock_user_string(arg_addr))) {
102 gemu_log("\"%s\",", s);
Christoph Egger18c9a9c2009-07-17 17:48:03 +0000103 unlock_user(s, arg_addr, 0);
blueswir184778502008-10-26 20:33:16 +0000104 }
105 }
blueswir184778502008-10-26 20:33:16 +0000106 gemu_log("NULL})");
107}
108
Sean Brunob85159a2014-06-08 09:57:25 -0700109static 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
Stacey Sonea1ab4c2020-12-18 13:54:50 -0700128static 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
blueswir184778502008-10-26 20:33:16 +0000136/*
137 * Variants for the return value output function
138 */
139
Sean Bruno88dae462014-06-08 09:57:23 -0700140static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
blueswir184778502008-10-26 20:33:16 +0000141{
Sean Bruno88dae462014-06-08 09:57:23 -0700142 if (ret == -1) {
blueswir184778502008-10-26 20:33:16 +0000143 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
blueswir184778502008-10-26 20:33:16 +0000149/*
150 * An array of all of the syscalls we know about
151 */
152
153static const struct syscallname freebsd_scnames[] = {
154#include "freebsd/strace.list"
155};
156static const struct syscallname netbsd_scnames[] = {
157#include "netbsd/strace.list"
158};
159static const struct syscallname openbsd_scnames[] = {
160#include "openbsd/strace.list"
161};
162
Sean Bruno88dae462014-06-08 09:57:23 -0700163static 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)
blueswir184778502008-10-26 20:33:16 +0000166{
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
Sean Bruno88dae462014-06-08 09:57:23 -0700174 for (i = 0; i < nscnames; i++) {
blueswir184778502008-10-26 20:33:16 +0000175 if (scnames[i].nr == num) {
176 if (scnames[i].call != NULL) {
177 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
Sean Bruno88dae462014-06-08 09:57:23 -0700178 arg6);
blueswir184778502008-10-26 20:33:16 +0000179 } else {
180 /* XXX: this format system is broken because it uses
181 host types and host pointers for strings */
Sean Bruno88dae462014-06-08 09:57:23 -0700182 if (scnames[i].format != NULL) {
blueswir184778502008-10-26 20:33:16 +0000183 format = scnames[i].format;
Sean Bruno88dae462014-06-08 09:57:23 -0700184 }
185 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5,
186 arg6);
blueswir184778502008-10-26 20:33:16 +0000187 }
188 return;
189 }
Sean Bruno88dae462014-06-08 09:57:23 -0700190 }
blueswir184778502008-10-26 20:33:16 +0000191 gemu_log("Unknown syscall %d\n", num);
192}
193
Sean Bruno88dae462014-06-08 09:57:23 -0700194static void print_syscall_ret(int num, abi_long ret,
195 const struct syscallname *scnames, unsigned int nscnames)
blueswir184778502008-10-26 20:33:16 +0000196{
197 unsigned int i;
198
Sean Bruno88dae462014-06-08 09:57:23 -0700199 for (i = 0; i < nscnames; i++) {
blueswir184778502008-10-26 20:33:16 +0000200 if (scnames[i].nr == num) {
201 if (scnames[i].result != NULL) {
202 scnames[i].result(&scnames[i], ret);
203 } else {
Sean Bruno88dae462014-06-08 09:57:23 -0700204 if (ret < 0) {
blueswir184778502008-10-26 20:33:16 +0000205 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 }
Sean Bruno88dae462014-06-08 09:57:23 -0700213 }
blueswir184778502008-10-26 20:33:16 +0000214}
215
216/*
217 * The public interface to this module.
218 */
Sean Bruno88dae462014-06-08 09:57:23 -0700219void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
220 abi_long arg4, abi_long arg5, abi_long arg6)
blueswir184778502008-10-26 20:33:16 +0000221{
Sean Bruno88dae462014-06-08 09:57:23 -0700222
223 print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2,
224 arg3, arg4, arg5, arg6);
blueswir184778502008-10-26 20:33:16 +0000225}
226
Sean Bruno88dae462014-06-08 09:57:23 -0700227void print_freebsd_syscall_ret(int num, abi_long ret)
blueswir184778502008-10-26 20:33:16 +0000228{
Sean Bruno88dae462014-06-08 09:57:23 -0700229
blueswir184778502008-10-26 20:33:16 +0000230 print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
231}
232
Sean Bruno88dae462014-06-08 09:57:23 -0700233void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
234 abi_long arg4, abi_long arg5, abi_long arg6)
blueswir184778502008-10-26 20:33:16 +0000235{
Sean Bruno88dae462014-06-08 09:57:23 -0700236
blueswir184778502008-10-26 20:33:16 +0000237 print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
238 arg1, arg2, arg3, arg4, arg5, arg6);
239}
240
Sean Bruno88dae462014-06-08 09:57:23 -0700241void print_netbsd_syscall_ret(int num, abi_long ret)
blueswir184778502008-10-26 20:33:16 +0000242{
Sean Bruno88dae462014-06-08 09:57:23 -0700243
blueswir184778502008-10-26 20:33:16 +0000244 print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
245}
246
Sean Bruno88dae462014-06-08 09:57:23 -0700247void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
248 abi_long arg4, abi_long arg5, abi_long arg6)
blueswir184778502008-10-26 20:33:16 +0000249{
Sean Bruno88dae462014-06-08 09:57:23 -0700250
251 print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2,
252 arg3, arg4, arg5, arg6);
blueswir184778502008-10-26 20:33:16 +0000253}
254
Sean Bruno88dae462014-06-08 09:57:23 -0700255void print_openbsd_syscall_ret(int num, abi_long ret)
blueswir184778502008-10-26 20:33:16 +0000256{
Sean Bruno88dae462014-06-08 09:57:23 -0700257
blueswir184778502008-10-26 20:33:16 +0000258 print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
259}
Warner Loshfd5bec92022-01-08 20:04:18 -0700260
261static void
262print_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
328void 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}