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1 /*
2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
7  *                     Linux for s390 port by D.J. Barrow
8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
9  * Copyright (c) 1999-2018 The strace developers.
10  * All rights reserved.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. The name of the author may not be used to endorse or promote products
21  *    derived from this software without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #include "defs.h"
36 #include "mmap_notify.h"
37 #include "native_defs.h"
38 #include "ptrace.h"
39 #include "nsig.h"
40 #include "number_set.h"
41 #include "delay.h"
42 #include "retval.h"
43 #include <limits.h>
44 
45 /* for struct iovec */
46 #include <sys/uio.h>
47 
48 /* for __X32_SYSCALL_BIT */
49 #include <asm/unistd.h>
50 
51 #include "regs.h"
52 
53 #if defined(SPARC64)
54 # undef PTRACE_GETREGS
55 # define PTRACE_GETREGS PTRACE_GETREGS64
56 # undef PTRACE_SETREGS
57 # define PTRACE_SETREGS PTRACE_SETREGS64
58 #endif
59 
60 #include "syscall.h"
61 #include "xstring.h"
62 
63 /* Define these shorthand notations to simplify the syscallent files. */
64 #include "sysent_shorthand_defs.h"
65 
66 #define SEN(syscall_name) SEN_ ## syscall_name, SYS_FUNC_NAME(sys_ ## syscall_name)
67 
68 const struct_sysent sysent0[] = {
69 #include "syscallent.h"
70 };
71 
72 #if SUPPORTED_PERSONALITIES > 1
73 # include PERSONALITY1_INCLUDE_FUNCS
74 static const struct_sysent sysent1[] = {
75 # include "syscallent1.h"
76 };
77 #endif
78 
79 #if SUPPORTED_PERSONALITIES > 2
80 # include PERSONALITY2_INCLUDE_FUNCS
81 static const struct_sysent sysent2[] = {
82 # include "syscallent2.h"
83 };
84 #endif
85 
86 /* Now undef them since short defines cause wicked namespace pollution. */
87 #include "sysent_shorthand_undefs.h"
88 
89 const char *const errnoent[] = {
90 #include "errnoent.h"
91 };
92 const char *const signalent[] = {
93 #include "signalent.h"
94 
95 };
96 /*
97  * `ioctlent[012].h' files are automatically generated by the auxiliary
98  * program `ioctlsort', such that the list is sorted by the `code' field.
99  * This has the side-effect of resolving the _IO.. macros into
100  * plain integers, eliminating the need to include here everything
101  * in "/usr/include".
102  */
103 
104 const struct_ioctlent ioctlent0[] = {
105 #include "ioctlent0.h"
106 };
107 
108 #if SUPPORTED_PERSONALITIES > 1
109 static const struct_ioctlent ioctlent1[] = {
110 # include "ioctlent1.h"
111 };
112 # include PERSONALITY0_INCLUDE_PRINTERS_DECLS
113 static const struct_printers printers0 = {
114 # include PERSONALITY0_INCLUDE_PRINTERS_DEFS
115 };
116 # include PERSONALITY1_INCLUDE_PRINTERS_DECLS
117 static const struct_printers printers1 = {
118 # include PERSONALITY1_INCLUDE_PRINTERS_DEFS
119 };
120 #endif
121 
122 #if SUPPORTED_PERSONALITIES > 2
123 static const struct_ioctlent ioctlent2[] = {
124 # include "ioctlent2.h"
125 };
126 # include PERSONALITY2_INCLUDE_PRINTERS_DECLS
127 static const struct_printers printers2 = {
128 # include PERSONALITY2_INCLUDE_PRINTERS_DEFS
129 };
130 #endif
131 
132 enum {
133 	nsyscalls0 = ARRAY_SIZE(sysent0)
134 #if SUPPORTED_PERSONALITIES > 1
135 	, nsyscalls1 = ARRAY_SIZE(sysent1)
136 # if SUPPORTED_PERSONALITIES > 2
137 	, nsyscalls2 = ARRAY_SIZE(sysent2)
138 # endif
139 #endif
140 };
141 
142 enum {
143 	nioctlents0 = ARRAY_SIZE(ioctlent0)
144 #if SUPPORTED_PERSONALITIES > 1
145 	, nioctlents1 = ARRAY_SIZE(ioctlent1)
146 # if SUPPORTED_PERSONALITIES > 2
147 	, nioctlents2 = ARRAY_SIZE(ioctlent2)
148 # endif
149 #endif
150 };
151 
152 #if SUPPORTED_PERSONALITIES > 1
153 const struct_sysent *sysent = sysent0;
154 const struct_ioctlent *ioctlent = ioctlent0;
155 const struct_printers *printers = &printers0;
156 #endif
157 
158 const unsigned int nerrnos = ARRAY_SIZE(errnoent);
159 const unsigned int nsignals = ARRAY_SIZE(signalent);
160 unsigned nsyscalls = nsyscalls0;
161 unsigned nioctlents = nioctlents0;
162 
163 const unsigned int nsyscall_vec[SUPPORTED_PERSONALITIES] = {
164 	nsyscalls0,
165 #if SUPPORTED_PERSONALITIES > 1
166 	nsyscalls1,
167 #endif
168 #if SUPPORTED_PERSONALITIES > 2
169 	nsyscalls2,
170 #endif
171 };
172 const struct_sysent *const sysent_vec[SUPPORTED_PERSONALITIES] = {
173 	sysent0,
174 #if SUPPORTED_PERSONALITIES > 1
175 	sysent1,
176 #endif
177 #if SUPPORTED_PERSONALITIES > 2
178 	sysent2,
179 #endif
180 };
181 
182 const char *const personality_names[] =
183 # if defined X86_64
184 	{"64 bit", "32 bit", "x32"}
185 # elif defined X32
186 	{"x32", "32 bit"}
187 # elif SUPPORTED_PERSONALITIES == 2
188 	{"64 bit", "32 bit"}
189 # else
190 	{STRINGIFY_VAL(__WORDSIZE) " bit"}
191 # endif
192 	;
193 
194 const char *const personality_designators[] =
195 # if defined X86_64
196 	{ "64", "32", "x32" }
197 # elif defined X32
198 	{ "x32", "32" }
199 # elif SUPPORTED_PERSONALITIES == 2
200 	{ "64", "32" }
201 # else
202 	{ STRINGIFY_VAL(__WORDSIZE) }
203 # endif
204 	;
205 
206 #if SUPPORTED_PERSONALITIES > 1
207 
208 unsigned current_personality;
209 
210 # ifndef current_wordsize
211 unsigned current_wordsize = PERSONALITY0_WORDSIZE;
212 static const int personality_wordsize[SUPPORTED_PERSONALITIES] = {
213 	PERSONALITY0_WORDSIZE,
214 	PERSONALITY1_WORDSIZE,
215 # if SUPPORTED_PERSONALITIES > 2
216 	PERSONALITY2_WORDSIZE,
217 # endif
218 };
219 # endif
220 
221 # ifndef current_klongsize
222 unsigned current_klongsize = PERSONALITY0_KLONGSIZE;
223 static const int personality_klongsize[SUPPORTED_PERSONALITIES] = {
224 	PERSONALITY0_KLONGSIZE,
225 	PERSONALITY1_KLONGSIZE,
226 #  if SUPPORTED_PERSONALITIES > 2
227 	PERSONALITY2_KLONGSIZE,
228 #  endif
229 };
230 # endif
231 
232 void
set_personality(unsigned int personality)233 set_personality(unsigned int personality)
234 {
235 	if (personality == current_personality)
236 		return;
237 
238 	if (personality >= SUPPORTED_PERSONALITIES)
239 		error_msg_and_die("Requested switch to unsupported personality "
240 				  "%u", personality);
241 
242 	nsyscalls = nsyscall_vec[personality];
243 	sysent = sysent_vec[personality];
244 
245 	switch (personality) {
246 	case 0:
247 		ioctlent = ioctlent0;
248 		nioctlents = nioctlents0;
249 		printers = &printers0;
250 		break;
251 
252 	case 1:
253 		ioctlent = ioctlent1;
254 		nioctlents = nioctlents1;
255 		printers = &printers1;
256 		break;
257 
258 # if SUPPORTED_PERSONALITIES > 2
259 	case 2:
260 		ioctlent = ioctlent2;
261 		nioctlents = nioctlents2;
262 		printers = &printers2;
263 		break;
264 # endif
265 	}
266 
267 	current_personality = personality;
268 # ifndef current_wordsize
269 	current_wordsize = personality_wordsize[personality];
270 # endif
271 # ifndef current_klongsize
272 	current_klongsize = personality_klongsize[personality];
273 # endif
274 }
275 
276 static void
update_personality(struct tcb * tcp,unsigned int personality)277 update_personality(struct tcb *tcp, unsigned int personality)
278 {
279 	static bool need_mpers_warning[] =
280 		{ false, !HAVE_PERSONALITY_1_MPERS, !HAVE_PERSONALITY_2_MPERS };
281 
282 	set_personality(personality);
283 
284 	if (personality == tcp->currpers)
285 		return;
286 	tcp->currpers = personality;
287 
288 	if (!qflag) {
289 		error_msg("[ Process PID=%d runs in %s mode. ]",
290 			  tcp->pid, personality_names[personality]);
291 	}
292 
293 	if (need_mpers_warning[personality]) {
294 		error_msg("WARNING: Proper structure decoding for this "
295 			  "personality is not supported, please consider "
296 			  "building strace with mpers support enabled.");
297 		need_mpers_warning[personality] = false;
298 	}
299 }
300 #endif
301 
302 #ifdef SYS_socket_subcall
303 static void
decode_socket_subcall(struct tcb * tcp)304 decode_socket_subcall(struct tcb *tcp)
305 {
306 	const int call = tcp->u_arg[0];
307 
308 	if (call < 1 || call >= SYS_socket_nsubcalls)
309 		return;
310 
311 	const kernel_ulong_t scno = SYS_socket_subcall + call;
312 	const unsigned int nargs = sysent[scno].nargs;
313 	uint64_t buf[nargs];
314 
315 	if (umoven(tcp, tcp->u_arg[1], nargs * current_wordsize, buf) < 0)
316 		return;
317 
318 	tcp->scno = scno;
319 	tcp->qual_flg = qual_flags(scno);
320 	tcp->s_ent = &sysent[scno];
321 
322 	unsigned int i;
323 	for (i = 0; i < nargs; ++i)
324 		tcp->u_arg[i] = (sizeof(uint32_t) == current_wordsize)
325 				? ((uint32_t *) (void *) buf)[i] : buf[i];
326 }
327 #endif /* SYS_socket_subcall */
328 
329 #ifdef SYS_ipc_subcall
330 static void
decode_ipc_subcall(struct tcb * tcp)331 decode_ipc_subcall(struct tcb *tcp)
332 {
333 	unsigned int call = tcp->u_arg[0];
334 	const unsigned int version = call >> 16;
335 
336 	if (version) {
337 # if defined S390 || defined S390X
338 		return;
339 # else
340 #  ifdef SPARC64
341 		if (current_wordsize == 8)
342 			return;
343 #  endif
344 		set_tcb_priv_ulong(tcp, version);
345 		call &= 0xffff;
346 # endif
347 	}
348 
349 	switch (call) {
350 		case  1: case  2: case  3: case  4:
351 		case 11: case 12: case 13: case 14:
352 		case 21: case 22: case 23: case 24:
353 			break;
354 		default:
355 			return;
356 	}
357 
358 	tcp->scno = SYS_ipc_subcall + call;
359 	tcp->qual_flg = qual_flags(tcp->scno);
360 	tcp->s_ent = &sysent[tcp->scno];
361 
362 	const unsigned int n = tcp->s_ent->nargs;
363 	unsigned int i;
364 	for (i = 0; i < n; i++)
365 		tcp->u_arg[i] = tcp->u_arg[i + 1];
366 }
367 #endif /* SYS_ipc_subcall */
368 
369 #ifdef SYS_syscall_subcall
370 static void
decode_syscall_subcall(struct tcb * tcp)371 decode_syscall_subcall(struct tcb *tcp)
372 {
373 	if (!scno_is_valid(tcp->u_arg[0]))
374 		return;
375 	tcp->scno = tcp->u_arg[0];
376 	tcp->qual_flg = qual_flags(tcp->scno);
377 	tcp->s_ent = &sysent[tcp->scno];
378 	memmove(&tcp->u_arg[0], &tcp->u_arg[1],
379 		sizeof(tcp->u_arg) - sizeof(tcp->u_arg[0]));
380 # ifdef LINUX_MIPSO32
381 	/*
382 	 * Fetching the last arg of 7-arg syscalls (fadvise64_64
383 	 * and sync_file_range) requires additional code,
384 	 * see linux/mips/get_syscall_args.c
385 	 */
386 	if (tcp->s_ent->nargs == MAX_ARGS) {
387 		if (umoven(tcp,
388 			   mips_REG_SP + MAX_ARGS * sizeof(tcp->u_arg[0]),
389 			   sizeof(tcp->u_arg[0]),
390 			   &tcp->u_arg[MAX_ARGS - 1]) < 0)
391 		tcp->u_arg[MAX_ARGS - 1] = 0;
392 	}
393 # endif /* LINUX_MIPSO32 */
394 }
395 #endif /* SYS_syscall_subcall */
396 
397 static void
dumpio(struct tcb * tcp)398 dumpio(struct tcb *tcp)
399 {
400 	int fd = tcp->u_arg[0];
401 	if (fd < 0)
402 		return;
403 
404 	if (is_number_in_set(fd, write_set)) {
405 		switch (tcp->s_ent->sen) {
406 		case SEN_write:
407 		case SEN_pwrite:
408 		case SEN_send:
409 		case SEN_sendto:
410 		case SEN_mq_timedsend:
411 			dumpstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
412 			break;
413 		case SEN_writev:
414 		case SEN_pwritev:
415 		case SEN_pwritev2:
416 		case SEN_vmsplice:
417 			dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], -1);
418 			break;
419 		case SEN_sendmsg:
420 			dumpiov_in_msghdr(tcp, tcp->u_arg[1], -1);
421 			break;
422 		case SEN_sendmmsg:
423 			dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
424 			break;
425 		}
426 	}
427 
428 	if (syserror(tcp))
429 		return;
430 
431 	if (is_number_in_set(fd, read_set)) {
432 		switch (tcp->s_ent->sen) {
433 		case SEN_read:
434 		case SEN_pread:
435 		case SEN_recv:
436 		case SEN_recvfrom:
437 		case SEN_mq_timedreceive:
438 			dumpstr(tcp, tcp->u_arg[1], tcp->u_rval);
439 			return;
440 		case SEN_readv:
441 		case SEN_preadv:
442 		case SEN_preadv2:
443 			dumpiov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1],
444 				     tcp->u_rval);
445 			return;
446 		case SEN_recvmsg:
447 			dumpiov_in_msghdr(tcp, tcp->u_arg[1], tcp->u_rval);
448 			return;
449 		case SEN_recvmmsg:
450 			dumpiov_in_mmsghdr(tcp, tcp->u_arg[1]);
451 			return;
452 		}
453 	}
454 }
455 
456 const char *
err_name(unsigned long err)457 err_name(unsigned long err)
458 {
459 	if ((err < nerrnos) && errnoent[err])
460 		return errnoent[err];
461 
462 	return NULL;
463 }
464 
465 static void
print_err_ret(kernel_ulong_t ret,unsigned long u_error)466 print_err_ret(kernel_ulong_t ret, unsigned long u_error)
467 {
468 	const char *u_error_str = err_name(u_error);
469 
470 	if (u_error_str)
471 		tprintf("= %" PRI_kld " %s (%s)",
472 			ret, u_error_str, strerror(u_error));
473 	else
474 		tprintf("= %" PRI_kld " (errno %lu)", ret, u_error);
475 }
476 
477 static long get_regs(struct tcb *);
478 static int get_syscall_args(struct tcb *);
479 static int get_syscall_result(struct tcb *);
480 static int arch_get_scno(struct tcb *tcp);
481 static int arch_set_scno(struct tcb *, kernel_ulong_t);
482 static void get_error(struct tcb *, const bool);
483 static int arch_set_error(struct tcb *);
484 static int arch_set_success(struct tcb *);
485 
486 struct inject_opts *inject_vec[SUPPORTED_PERSONALITIES];
487 
488 static struct inject_opts *
tcb_inject_opts(struct tcb * tcp)489 tcb_inject_opts(struct tcb *tcp)
490 {
491 	return (scno_in_range(tcp->scno) && tcp->inject_vec[current_personality])
492 	       ? &tcp->inject_vec[current_personality][tcp->scno] : NULL;
493 }
494 
495 
496 static long
tamper_with_syscall_entering(struct tcb * tcp,unsigned int * signo)497 tamper_with_syscall_entering(struct tcb *tcp, unsigned int *signo)
498 {
499 	if (!tcp->inject_vec[current_personality]) {
500 		tcp->inject_vec[current_personality] =
501 			xcalloc(nsyscalls, sizeof(**inject_vec));
502 		memcpy(tcp->inject_vec[current_personality],
503 		       inject_vec[current_personality],
504 		       nsyscalls * sizeof(**inject_vec));
505 	}
506 
507 	struct inject_opts *opts = tcb_inject_opts(tcp);
508 
509 	if (!opts || opts->first == 0)
510 		return 0;
511 
512 	--opts->first;
513 
514 	if (opts->first != 0)
515 		return 0;
516 
517 	opts->first = opts->step;
518 
519 	if (!recovering(tcp)) {
520 		if (opts->data.flags & INJECT_F_SIGNAL)
521 			*signo = opts->data.signo;
522 		if (opts->data.flags & (INJECT_F_ERROR | INJECT_F_RETVAL)) {
523 			kernel_long_t scno =
524 				(opts->data.flags & INJECT_F_SYSCALL)
525 				? (kernel_long_t) shuffle_scno(opts->data.scno)
526 				: -1;
527 
528 			if (!arch_set_scno(tcp, scno)) {
529 				tcp->flags |= TCB_TAMPERED;
530 				if (scno != -1)
531 					tcp->flags |= TCB_TAMPERED_NO_FAIL;
532 			}
533 		}
534 		if (opts->data.flags & INJECT_F_DELAY_ENTER)
535 			delay_tcb(tcp, opts->data.delay_idx, true);
536 		if (opts->data.flags & INJECT_F_DELAY_EXIT)
537 			tcp->flags |= TCB_INJECT_DELAY_EXIT;
538 	}
539 
540 	return 0;
541 }
542 
543 static long
tamper_with_syscall_exiting(struct tcb * tcp)544 tamper_with_syscall_exiting(struct tcb *tcp)
545 {
546 	struct inject_opts *opts = tcb_inject_opts(tcp);
547 	if (!opts)
548 		return 0;
549 
550 	if (inject_delay_exit(tcp))
551 		delay_tcb(tcp, opts->data.delay_idx, false);
552 
553 	if (!syscall_tampered(tcp))
554 		return 0;
555 
556 	if (!syserror(tcp) ^ !!syscall_tampered_nofail(tcp)) {
557 		error_msg("Failed to tamper with process %d: unexpectedly got"
558 			  " %serror (return value %#" PRI_klx ", error %lu)",
559 			  tcp->pid, syscall_tampered_nofail(tcp) ? "" : "no ",
560 			  tcp->u_rval, tcp->u_error);
561 
562 		return 1;
563 	}
564 
565 	bool update_tcb = false;
566 
567 	if (opts->data.flags & INJECT_F_RETVAL) {
568 		kernel_long_t inject_rval =
569 			retval_get(opts->data.rval_idx);
570 		kernel_long_t u_rval = tcp->u_rval;
571 
572 		tcp->u_rval = inject_rval;
573 		if (arch_set_success(tcp)) {
574 			tcp->u_rval = u_rval;
575 		} else {
576 			update_tcb = true;
577 			tcp->u_error = 0;
578 		}
579 	} else {
580 		unsigned long new_error = retval_get(opts->data.rval_idx);
581 
582 		if (new_error != tcp->u_error && new_error <= MAX_ERRNO_VALUE) {
583 			unsigned long u_error = tcp->u_error;
584 
585 			tcp->u_error = new_error;
586 			if (arch_set_error(tcp)) {
587 				tcp->u_error = u_error;
588 			} else {
589 				update_tcb = true;
590 			}
591 		}
592 	}
593 
594 	if (update_tcb) {
595 		tcp->u_error = 0;
596 		get_error(tcp, !(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS));
597 	}
598 
599 	return 0;
600 }
601 
602 /*
603  * Returns:
604  * 0: "ignore this ptrace stop", bail out silently.
605  * 1: ok, decoded; call
606  *    syscall_entering_finish(tcp, syscall_entering_trace(tcp, ...)).
607  * other: error; call syscall_entering_finish(tcp, res), where res is the value
608  *    returned.
609  */
610 int
syscall_entering_decode(struct tcb * tcp)611 syscall_entering_decode(struct tcb *tcp)
612 {
613 	int res = get_scno(tcp);
614 	if (res == 0)
615 		return res;
616 	int scno_good = res;
617 	if (res != 1 || (res = get_syscall_args(tcp)) != 1) {
618 		printleader(tcp);
619 		tprintf("%s(", scno_good == 1 ? tcp->s_ent->sys_name : "????");
620 		/*
621 		 * " <unavailable>" will be added later by the code which
622 		 * detects ptrace errors.
623 		 */
624 		return res;
625 	}
626 
627 #if defined SYS_ipc_subcall	\
628  || defined SYS_socket_subcall	\
629  || defined SYS_syscall_subcall
630 	for (;;) {
631 		switch (tcp->s_ent->sen) {
632 # ifdef SYS_ipc_subcall
633 		case SEN_ipc:
634 			decode_ipc_subcall(tcp);
635 			break;
636 # endif
637 # ifdef SYS_socket_subcall
638 		case SEN_socketcall:
639 			decode_socket_subcall(tcp);
640 			break;
641 # endif
642 # ifdef SYS_syscall_subcall
643 		case SEN_syscall:
644 			decode_syscall_subcall(tcp);
645 			if (tcp->s_ent->sen != SEN_syscall)
646 				continue;
647 			break;
648 # endif
649 		}
650 		break;
651 	}
652 #endif
653 
654 	return 1;
655 }
656 
657 int
syscall_entering_trace(struct tcb * tcp,unsigned int * sig)658 syscall_entering_trace(struct tcb *tcp, unsigned int *sig)
659 {
660 	/* Restrain from fault injection while the trace executes strace code. */
661 	if (hide_log(tcp)) {
662 		tcp->qual_flg &= ~QUAL_INJECT;
663 	}
664 
665 	switch (tcp->s_ent->sen) {
666 		case SEN_execve:
667 		case SEN_execveat:
668 #if defined SPARC || defined SPARC64
669 		case SEN_execv:
670 #endif
671 			tcp->flags &= ~TCB_HIDE_LOG;
672 			break;
673 	}
674 
675 	if (!traced(tcp) || (tracing_paths && !pathtrace_match(tcp))) {
676 		tcp->flags |= TCB_FILTERED;
677 		return 0;
678 	}
679 
680 	tcp->flags &= ~TCB_FILTERED;
681 
682 	if (hide_log(tcp)) {
683 		return 0;
684 	}
685 
686 	if (inject(tcp))
687 		tamper_with_syscall_entering(tcp, sig);
688 
689 	if (cflag == CFLAG_ONLY_STATS) {
690 		return 0;
691 	}
692 
693 #ifdef ENABLE_STACKTRACE
694 	if (stack_trace_enabled) {
695 		if (tcp->s_ent->sys_flags & STACKTRACE_CAPTURE_ON_ENTER)
696 			unwind_tcb_capture(tcp);
697 	}
698 #endif
699 
700 	printleader(tcp);
701 	tprintf("%s(", tcp->s_ent->sys_name);
702 	int res = raw(tcp) ? printargs(tcp) : tcp->s_ent->sys_func(tcp);
703 	fflush(tcp->outf);
704 	return res;
705 }
706 
707 void
syscall_entering_finish(struct tcb * tcp,int res)708 syscall_entering_finish(struct tcb *tcp, int res)
709 {
710 	tcp->flags |= TCB_INSYSCALL;
711 	tcp->sys_func_rval = res;
712 	/* Measure the entrance time as late as possible to avoid errors. */
713 	if ((Tflag || cflag) && !filtered(tcp))
714 		clock_gettime(CLOCK_MONOTONIC, &tcp->etime);
715 }
716 
717 /* Returns:
718  * 0: "bail out".
719  * 1: ok.
720  * -1: error in one of ptrace ops.
721  *
722  * If not 0, call syscall_exiting_trace(tcp, res), where res is the return
723  *    value. Anyway, call syscall_exiting_finish(tcp) then.
724  */
725 int
syscall_exiting_decode(struct tcb * tcp,struct timespec * pts)726 syscall_exiting_decode(struct tcb *tcp, struct timespec *pts)
727 {
728 	/* Measure the exit time as early as possible to avoid errors. */
729 	if ((Tflag || cflag) && !(filtered(tcp) || hide_log(tcp)))
730 		clock_gettime(CLOCK_MONOTONIC, pts);
731 
732 	if (tcp->s_ent->sys_flags & MEMORY_MAPPING_CHANGE)
733 		mmap_notify_report(tcp);
734 
735 	if (filtered(tcp) || hide_log(tcp))
736 		return 0;
737 
738 #if SUPPORTED_PERSONALITIES > 1
739 	update_personality(tcp, tcp->currpers);
740 #endif
741 
742 	return get_syscall_result(tcp);
743 }
744 
745 int
syscall_exiting_trace(struct tcb * tcp,struct timespec * ts,int res)746 syscall_exiting_trace(struct tcb *tcp, struct timespec *ts, int res)
747 {
748 	if (syscall_tampered(tcp) || inject_delay_exit(tcp))
749 		tamper_with_syscall_exiting(tcp);
750 
751 	if (cflag) {
752 		count_syscall(tcp, ts);
753 		if (cflag == CFLAG_ONLY_STATS) {
754 			return 0;
755 		}
756 	}
757 
758 	/* If not in -ff mode, and printing_tcp != tcp,
759 	 * then the log currently does not end with output
760 	 * of _our syscall entry_, but with something else.
761 	 * We need to say which syscall's return is this.
762 	 *
763 	 * Forced reprinting via TCB_REPRINT is used only by
764 	 * "strace -ff -oLOG test/threaded_execve" corner case.
765 	 * It's the only case when -ff mode needs reprinting.
766 	 */
767 	if ((followfork < 2 && printing_tcp != tcp) || (tcp->flags & TCB_REPRINT)) {
768 		tcp->flags &= ~TCB_REPRINT;
769 		printleader(tcp);
770 		tprintf("<... %s resumed> ", tcp->s_ent->sys_name);
771 	}
772 	printing_tcp = tcp;
773 
774 	tcp->s_prev_ent = NULL;
775 	if (res != 1) {
776 		/* There was error in one of prior ptrace ops */
777 		tprints(") ");
778 		tabto();
779 		tprints("= ? <unavailable>\n");
780 		line_ended();
781 		return res;
782 	}
783 	tcp->s_prev_ent = tcp->s_ent;
784 
785 	int sys_res = 0;
786 	if (raw(tcp)) {
787 		/* sys_res = printargs(tcp); - but it's nop on sysexit */
788 	} else {
789 	/* FIXME: not_failing_only (IOW, option -z) is broken:
790 	 * failure of syscall is known only after syscall return.
791 	 * Thus we end up with something like this on, say, ENOENT:
792 	 *     open("does_not_exist", O_RDONLY <unfinished ...>
793 	 *     {next syscall decode}
794 	 * whereas the intended result is that open(...) line
795 	 * is not shown at all.
796 	 */
797 		if (not_failing_only && tcp->u_error)
798 			return 0;	/* ignore failed syscalls */
799 		if (tcp->sys_func_rval & RVAL_DECODED)
800 			sys_res = tcp->sys_func_rval;
801 		else
802 			sys_res = tcp->s_ent->sys_func(tcp);
803 	}
804 
805 	tprints(") ");
806 	tabto();
807 
808 	if (raw(tcp)) {
809 		if (tcp->u_error)
810 			print_err_ret(tcp->u_rval, tcp->u_error);
811 		else
812 			tprintf("= %#" PRI_klx, tcp->u_rval);
813 
814 		if (syscall_tampered(tcp))
815 			tprints(" (INJECTED)");
816 	} else if (!(sys_res & RVAL_NONE) && tcp->u_error) {
817 		switch (tcp->u_error) {
818 		/* Blocked signals do not interrupt any syscalls.
819 		 * In this case syscalls don't return ERESTARTfoo codes.
820 		 *
821 		 * Deadly signals set to SIG_DFL interrupt syscalls
822 		 * and kill the process regardless of which of the codes below
823 		 * is returned by the interrupted syscall.
824 		 * In some cases, kernel forces a kernel-generated deadly
825 		 * signal to be unblocked and set to SIG_DFL (and thus cause
826 		 * death) if it is blocked or SIG_IGNed: for example, SIGSEGV
827 		 * or SIGILL. (The alternative is to leave process spinning
828 		 * forever on the faulty instruction - not useful).
829 		 *
830 		 * SIG_IGNed signals and non-deadly signals set to SIG_DFL
831 		 * (for example, SIGCHLD, SIGWINCH) interrupt syscalls,
832 		 * but kernel will always restart them.
833 		 */
834 		case ERESTARTSYS:
835 			/* Most common type of signal-interrupted syscall exit code.
836 			 * The system call will be restarted with the same arguments
837 			 * if SA_RESTART is set; otherwise, it will fail with EINTR.
838 			 */
839 			tprints("= ? ERESTARTSYS (To be restarted if SA_RESTART is set)");
840 			break;
841 		case ERESTARTNOINTR:
842 			/* Rare. For example, fork() returns this if interrupted.
843 			 * SA_RESTART is ignored (assumed set): the restart is unconditional.
844 			 */
845 			tprints("= ? ERESTARTNOINTR (To be restarted)");
846 			break;
847 		case ERESTARTNOHAND:
848 			/* pause(), rt_sigsuspend() etc use this code.
849 			 * SA_RESTART is ignored (assumed not set):
850 			 * syscall won't restart (will return EINTR instead)
851 			 * even after signal with SA_RESTART set. However,
852 			 * after SIG_IGN or SIG_DFL signal it will restart
853 			 * (thus the name "restart only if has no handler").
854 			 */
855 			tprints("= ? ERESTARTNOHAND (To be restarted if no handler)");
856 			break;
857 		case ERESTART_RESTARTBLOCK:
858 			/* Syscalls like nanosleep(), poll() which can't be
859 			 * restarted with their original arguments use this
860 			 * code. Kernel will execute restart_syscall() instead,
861 			 * which changes arguments before restarting syscall.
862 			 * SA_RESTART is ignored (assumed not set) similarly
863 			 * to ERESTARTNOHAND. (Kernel can't honor SA_RESTART
864 			 * since restart data is saved in "restart block"
865 			 * in task struct, and if signal handler uses a syscall
866 			 * which in turn saves another such restart block,
867 			 * old data is lost and restart becomes impossible)
868 			 */
869 			tprints("= ? ERESTART_RESTARTBLOCK (Interrupted by signal)");
870 			break;
871 		default:
872 			print_err_ret(tcp->u_rval, tcp->u_error);
873 			break;
874 		}
875 		if (syscall_tampered(tcp))
876 			tprints(" (INJECTED)");
877 		if ((sys_res & RVAL_STR) && tcp->auxstr)
878 			tprintf(" (%s)", tcp->auxstr);
879 	} else {
880 		if (sys_res & RVAL_NONE)
881 			tprints("= ?");
882 		else {
883 			switch (sys_res & RVAL_MASK) {
884 			case RVAL_HEX:
885 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
886 				if (current_klongsize < sizeof(tcp->u_rval)) {
887 					tprintf("= %#x",
888 						(unsigned int) tcp->u_rval);
889 				} else
890 #endif
891 				{
892 					tprintf("= %#" PRI_klx, tcp->u_rval);
893 				}
894 				break;
895 			case RVAL_OCTAL:
896 				tprints("= ");
897 				print_numeric_long_umask(tcp->u_rval);
898 				break;
899 			case RVAL_UDECIMAL:
900 #if ANY_WORDSIZE_LESS_THAN_KERNEL_LONG
901 				if (current_klongsize < sizeof(tcp->u_rval)) {
902 					tprintf("= %u",
903 						(unsigned int) tcp->u_rval);
904 				} else
905 #endif
906 				{
907 					tprintf("= %" PRI_klu, tcp->u_rval);
908 				}
909 				break;
910 			case RVAL_FD:
911 				if (show_fd_path) {
912 					tprints("= ");
913 					printfd(tcp, tcp->u_rval);
914 				} else
915 					tprintf("= %" PRI_kld, tcp->u_rval);
916 				break;
917 			default:
918 				error_msg("invalid rval format");
919 				break;
920 			}
921 		}
922 		if ((sys_res & RVAL_STR) && tcp->auxstr)
923 			tprintf(" (%s)", tcp->auxstr);
924 		if (syscall_tampered(tcp))
925 			tprints(" (INJECTED)");
926 	}
927 	if (Tflag) {
928 		ts_sub(ts, ts, &tcp->etime);
929 		tprintf(" <%ld.%06ld>",
930 			(long) ts->tv_sec, (long) ts->tv_nsec / 1000);
931 	}
932 	tprints("\n");
933 	dumpio(tcp);
934 	line_ended();
935 
936 #ifdef ENABLE_STACKTRACE
937 	if (stack_trace_enabled)
938 		unwind_tcb_print(tcp);
939 #endif
940 	return 0;
941 }
942 
943 void
syscall_exiting_finish(struct tcb * tcp)944 syscall_exiting_finish(struct tcb *tcp)
945 {
946 	tcp->flags &= ~(TCB_INSYSCALL | TCB_TAMPERED | TCB_INJECT_DELAY_EXIT);
947 	tcp->sys_func_rval = 0;
948 	free_tcb_priv_data(tcp);
949 }
950 
951 bool
is_erestart(struct tcb * tcp)952 is_erestart(struct tcb *tcp)
953 {
954 	switch (tcp->u_error) {
955 		case ERESTARTSYS:
956 		case ERESTARTNOINTR:
957 		case ERESTARTNOHAND:
958 		case ERESTART_RESTARTBLOCK:
959 			return true;
960 		default:
961 			return false;
962 	}
963 }
964 
965 static unsigned long saved_u_error;
966 
967 void
temporarily_clear_syserror(struct tcb * tcp)968 temporarily_clear_syserror(struct tcb *tcp)
969 {
970 	saved_u_error = tcp->u_error;
971 	tcp->u_error = 0;
972 }
973 
974 void
restore_cleared_syserror(struct tcb * tcp)975 restore_cleared_syserror(struct tcb *tcp)
976 {
977 	tcp->u_error = saved_u_error;
978 }
979 
980 #define XLAT_MACROS_ONLY
981 # include "xlat/nt_descriptor_types.h"
982 #undef XLAT_MACROS_ONLY
983 
984 #include "arch_regs.c"
985 
986 #if HAVE_ARCH_GETRVAL2
987 # include "arch_getrval2.c"
988 #endif
989 
990 void
print_pc(struct tcb * tcp)991 print_pc(struct tcb *tcp)
992 {
993 #if defined ARCH_PC_REG
994 # define ARCH_GET_PC 0
995 #elif defined ARCH_PC_PEEK_ADDR
996 	kernel_ulong_t pc;
997 # define ARCH_PC_REG pc
998 # define ARCH_GET_PC upeek(tcp, ARCH_PC_PEEK_ADDR, &pc)
999 #else
1000 # error Neither ARCH_PC_REG nor ARCH_PC_PEEK_ADDR is defined
1001 #endif
1002 	if (get_regs(tcp) < 0 || ARCH_GET_PC)
1003 		tprints(current_wordsize == 4 ? "[????????] "
1004 					      : "[????????????????] ");
1005 	else
1006 		tprintf(current_wordsize == 4
1007 			? "[%08" PRI_klx "] " : "[%016" PRI_klx "] ",
1008 			(kernel_ulong_t) ARCH_PC_REG);
1009 }
1010 
1011 #include "getregs_old.h"
1012 
1013 #undef ptrace_getregset_or_getregs
1014 #undef ptrace_setregset_or_setregs
1015 #ifdef ARCH_REGS_FOR_GETREGSET
1016 
1017 # define ptrace_getregset_or_getregs ptrace_getregset
1018 static long
ptrace_getregset(pid_t pid)1019 ptrace_getregset(pid_t pid)
1020 {
1021 # ifdef ARCH_IOVEC_FOR_GETREGSET
1022 	/* variable iovec */
1023 	ARCH_IOVEC_FOR_GETREGSET.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET);
1024 	return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS,
1025 		      &ARCH_IOVEC_FOR_GETREGSET);
1026 # else
1027 	/* constant iovec */
1028 	static struct iovec io = {
1029 		.iov_base = &ARCH_REGS_FOR_GETREGSET,
1030 		.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1031 	};
1032 	return ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &io);
1033 
1034 # endif
1035 }
1036 
1037 # ifndef HAVE_GETREGS_OLD
1038 #  define ptrace_setregset_or_setregs ptrace_setregset
1039 static int
ptrace_setregset(pid_t pid)1040 ptrace_setregset(pid_t pid)
1041 {
1042 #  ifdef ARCH_IOVEC_FOR_GETREGSET
1043 	/* variable iovec */
1044 	return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS,
1045 		      &ARCH_IOVEC_FOR_GETREGSET);
1046 #  else
1047 	/* constant iovec */
1048 	static struct iovec io = {
1049 		.iov_base = &ARCH_REGS_FOR_GETREGSET,
1050 		.iov_len = sizeof(ARCH_REGS_FOR_GETREGSET)
1051 	};
1052 	return ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &io);
1053 #  endif
1054 }
1055 # endif /* !HAVE_GETREGS_OLD */
1056 
1057 #elif defined ARCH_REGS_FOR_GETREGS
1058 
1059 # define ptrace_getregset_or_getregs ptrace_getregs
1060 static long
ptrace_getregs(pid_t pid)1061 ptrace_getregs(pid_t pid)
1062 {
1063 # if defined SPARC || defined SPARC64
1064 	/* SPARC systems have the meaning of data and addr reversed */
1065 	return ptrace(PTRACE_GETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1066 # else
1067 	return ptrace(PTRACE_GETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1068 # endif
1069 }
1070 
1071 # ifndef HAVE_GETREGS_OLD
1072 #  define ptrace_setregset_or_setregs ptrace_setregs
1073 static int
ptrace_setregs(pid_t pid)1074 ptrace_setregs(pid_t pid)
1075 {
1076 #  if defined SPARC || defined SPARC64
1077 	/* SPARC systems have the meaning of data and addr reversed */
1078 	return ptrace(PTRACE_SETREGS, pid, (void *) &ARCH_REGS_FOR_GETREGS, 0);
1079 #  else
1080 	return ptrace(PTRACE_SETREGS, pid, NULL, &ARCH_REGS_FOR_GETREGS);
1081 #  endif
1082 }
1083 # endif /* !HAVE_GETREGS_OLD */
1084 
1085 #endif /* ARCH_REGS_FOR_GETREGSET || ARCH_REGS_FOR_GETREGS */
1086 
1087 #ifdef ptrace_getregset_or_getregs
1088 static long get_regs_error;
1089 #endif
1090 
1091 void
clear_regs(struct tcb * tcp)1092 clear_regs(struct tcb *tcp)
1093 {
1094 #ifdef ptrace_getregset_or_getregs
1095 	get_regs_error = -1;
1096 #endif
1097 }
1098 
1099 static long
get_regs(struct tcb * const tcp)1100 get_regs(struct tcb *const tcp)
1101 {
1102 #ifdef ptrace_getregset_or_getregs
1103 
1104 	if (get_regs_error != -1)
1105 		return get_regs_error;
1106 
1107 # ifdef HAVE_GETREGS_OLD
1108 	/*
1109 	 * Try PTRACE_GETREGSET/PTRACE_GETREGS first,
1110 	 * fallback to getregs_old.
1111 	 */
1112 	static int use_getregs_old;
1113 	if (use_getregs_old < 0) {
1114 		return get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1115 	} else if (use_getregs_old == 0) {
1116 		get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1117 		if (get_regs_error >= 0) {
1118 			use_getregs_old = -1;
1119 			return get_regs_error;
1120 		}
1121 		if (errno == EPERM || errno == ESRCH)
1122 			return get_regs_error;
1123 		use_getregs_old = 1;
1124 	}
1125 	return get_regs_error = getregs_old(tcp);
1126 # else /* !HAVE_GETREGS_OLD */
1127 	/* Assume that PTRACE_GETREGSET/PTRACE_GETREGS works. */
1128 	get_regs_error = ptrace_getregset_or_getregs(tcp->pid);
1129 
1130 #  if defined ARCH_PERSONALITY_0_IOV_SIZE
1131 	if (get_regs_error)
1132 		return get_regs_error;
1133 
1134 	switch (ARCH_IOVEC_FOR_GETREGSET.iov_len) {
1135 	case ARCH_PERSONALITY_0_IOV_SIZE:
1136 		update_personality(tcp, 0);
1137 		break;
1138 	case ARCH_PERSONALITY_1_IOV_SIZE:
1139 		update_personality(tcp, 1);
1140 		break;
1141 	default: {
1142 		static bool printed = false;
1143 
1144 		if (!printed) {
1145 			error_msg("Unsupported regset size returned by "
1146 				  "PTRACE_GETREGSET: %zu",
1147 				  ARCH_IOVEC_FOR_GETREGSET.iov_len);
1148 
1149 			printed = true;
1150 		}
1151 
1152 		update_personality(tcp, 0);
1153 	}
1154 	}
1155 #  endif /* ARCH_PERSONALITY_0_IOV_SIZE */
1156 
1157 	return get_regs_error;
1158 
1159 # endif /* !HAVE_GETREGS_OLD */
1160 
1161 #else /* !ptrace_getregset_or_getregs */
1162 
1163 # warning get_regs is not implemented for this architecture yet
1164 	return 0;
1165 
1166 #endif /* !ptrace_getregset_or_getregs */
1167 }
1168 
1169 #ifdef ptrace_setregset_or_setregs
1170 static int
set_regs(pid_t pid)1171 set_regs(pid_t pid)
1172 {
1173 	return ptrace_setregset_or_setregs(pid);
1174 }
1175 #endif /* ptrace_setregset_or_setregs */
1176 
1177 struct sysent_buf {
1178 	struct tcb *tcp;
1179 	struct_sysent ent;
1180 	char buf[sizeof("syscall_0x") + sizeof(kernel_ulong_t) * 2];
1181 };
1182 
1183 static void
free_sysent_buf(void * ptr)1184 free_sysent_buf(void *ptr)
1185 {
1186 	struct sysent_buf *s = ptr;
1187 	s->tcp->s_prev_ent = s->tcp->s_ent = NULL;
1188 	free(ptr);
1189 }
1190 
1191 /*
1192  * Returns:
1193  * 0: "ignore this ptrace stop", syscall_entering_decode() should return a "bail
1194  *    out silently" code.
1195  * 1: ok, continue in syscall_entering_decode().
1196  * other: error, syscall_entering_decode() should print error indicator
1197  *    ("????" etc) and return an appropriate code.
1198  */
1199 int
get_scno(struct tcb * tcp)1200 get_scno(struct tcb *tcp)
1201 {
1202 	if (get_regs(tcp) < 0)
1203 		return -1;
1204 
1205 	int rc = arch_get_scno(tcp);
1206 	if (rc != 1)
1207 		return rc;
1208 
1209 	tcp->scno = shuffle_scno(tcp->scno);
1210 
1211 	if (scno_is_valid(tcp->scno)) {
1212 		tcp->s_ent = &sysent[tcp->scno];
1213 		tcp->qual_flg = qual_flags(tcp->scno);
1214 	} else {
1215 		struct sysent_buf *s = xcalloc(1, sizeof(*s));
1216 
1217 		s->tcp = tcp;
1218 		s->ent.nargs = MAX_ARGS;
1219 		s->ent.sen = SEN_printargs;
1220 		s->ent.sys_func = printargs;
1221 		s->ent.sys_name = s->buf;
1222 		xsprintf(s->buf, "syscall_%#" PRI_klx, shuffle_scno(tcp->scno));
1223 
1224 		tcp->s_ent = &s->ent;
1225 		tcp->qual_flg = QUAL_RAW | DEFAULT_QUAL_FLAGS;
1226 
1227 		set_tcb_priv_data(tcp, s, free_sysent_buf);
1228 
1229 		debug_msg("pid %d invalid syscall %#" PRI_klx,
1230 			  tcp->pid, shuffle_scno(tcp->scno));
1231 	}
1232 
1233 	/*
1234 	 * We refrain from argument decoding during recovering
1235 	 * as tracee memory mappings has changed and the registers
1236 	 * are very likely pointing to garbage already.
1237 	 */
1238 	if (recovering(tcp))
1239 		tcp->qual_flg |= QUAL_RAW;
1240 
1241 	return 1;
1242 }
1243 
1244 #ifdef ptrace_getregset_or_getregs
1245 # define get_syscall_result_regs get_regs
1246 #else
1247 static int get_syscall_result_regs(struct tcb *);
1248 #endif
1249 
1250 /* Returns:
1251  * 1: ok, continue in syscall_exiting_trace().
1252  * -1: error, syscall_exiting_trace() should print error indicator
1253  *    ("????" etc) and bail out.
1254  */
1255 static int
get_syscall_result(struct tcb * tcp)1256 get_syscall_result(struct tcb *tcp)
1257 {
1258 	if (get_syscall_result_regs(tcp) < 0)
1259 		return -1;
1260 	tcp->u_error = 0;
1261 	get_error(tcp,
1262 		  (!(tcp->s_ent->sys_flags & SYSCALL_NEVER_FAILS)
1263 			|| syscall_tampered(tcp))
1264                   && !syscall_tampered_nofail(tcp));
1265 
1266 	return 1;
1267 }
1268 
1269 #include "get_scno.c"
1270 #include "set_scno.c"
1271 #include "get_syscall_args.c"
1272 #ifndef ptrace_getregset_or_getregs
1273 # include "get_syscall_result.c"
1274 #endif
1275 #include "get_error.c"
1276 #include "set_error.c"
1277 #ifdef HAVE_GETREGS_OLD
1278 # include "getregs_old.c"
1279 #endif
1280 #include "shuffle_scno.c"
1281 
1282 const char *
syscall_name(kernel_ulong_t scno)1283 syscall_name(kernel_ulong_t scno)
1284 {
1285 	return scno_is_valid(scno) ? sysent[scno].sys_name : NULL;
1286 }
1287