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 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include "defs.h" 35#include <sys/user.h> 36#include <fcntl.h> 37 38#ifdef HAVE_SYS_REG_H 39# include <sys/reg.h> 40#elif defined(HAVE_LINUX_PTRACE_H) 41# undef PTRACE_SYSCALL 42# ifdef HAVE_STRUCT_IA64_FPREG 43# define ia64_fpreg XXX_ia64_fpreg 44# endif 45# ifdef HAVE_STRUCT_PT_ALL_USER_REGS 46# define pt_all_user_regs XXX_pt_all_user_regs 47# endif 48# ifdef HAVE_STRUCT_PTRACE_PEEKSIGINFO_ARGS 49# define ptrace_peeksiginfo_args XXX_ptrace_peeksiginfo_args 50# endif 51# include <linux/ptrace.h> 52# undef ptrace_peeksiginfo_args 53# undef ia64_fpreg 54# undef pt_all_user_regs 55#endif 56 57#ifdef IA64 58# include <asm/ptrace_offsets.h> 59#endif 60 61#if defined(SPARC) || defined(SPARC64) || defined(MIPS) 62typedef struct { 63 struct pt_regs si_regs; 64 int si_mask; 65} m_siginfo_t; 66#elif defined HAVE_ASM_SIGCONTEXT_H 67# if !defined(IA64) && !defined(X86_64) && !defined(X32) 68# include <asm/sigcontext.h> 69# endif 70#else /* !HAVE_ASM_SIGCONTEXT_H */ 71# if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT 72struct sigcontext { 73 unsigned long sc_mask; 74 unsigned long sc_usp; 75 unsigned long sc_d0; 76 unsigned long sc_d1; 77 unsigned long sc_a0; 78 unsigned long sc_a1; 79 unsigned short sc_sr; 80 unsigned long sc_pc; 81 unsigned short sc_formatvec; 82}; 83# endif /* M68K */ 84#endif /* !HAVE_ASM_SIGCONTEXT_H */ 85 86#ifndef NSIG 87# warning: NSIG is not defined, using 32 88# define NSIG 32 89#elif NSIG < 32 90# error: NSIG < 32 91#endif 92 93#ifdef HAVE_SIGACTION 94 95/* The libc headers do not define this constant since it should only be 96 used by the implementation. So we define it here. */ 97#ifndef SA_RESTORER 98# ifdef ASM_SA_RESTORER 99# define SA_RESTORER ASM_SA_RESTORER 100# endif 101#endif 102 103#include "xlat/sigact_flags.h" 104#include "xlat/sigprocmaskcmds.h" 105 106#endif /* HAVE_SIGACTION */ 107 108/* Anonymous realtime signals. */ 109/* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a 110 constant. This is what we want. Otherwise, just use SIGRTMIN. */ 111#ifdef SIGRTMIN 112#ifndef __SIGRTMIN 113#define __SIGRTMIN SIGRTMIN 114#define __SIGRTMAX SIGRTMAX /* likewise */ 115#endif 116#endif 117 118/* Note on the size of sigset_t: 119 * 120 * In glibc, sigset_t is an array with space for 1024 bits (!), 121 * even though all arches supported by Linux have only 64 signals 122 * except MIPS, which has 128. IOW, it is 128 bytes long. 123 * 124 * In-kernel sigset_t is sized correctly (it is either 64 or 128 bit long). 125 * However, some old syscall return only 32 lower bits (one word). 126 * Example: sys_sigpending vs sys_rt_sigpending. 127 * 128 * Be aware of this fact when you try to 129 * memcpy(&tcp->u_arg[1], &something, sizeof(sigset_t)) 130 * - sizeof(sigset_t) is much bigger than you think, 131 * it may overflow tcp->u_arg[] array, and it may try to copy more data 132 * than is really available in <something>. 133 * Similarly, 134 * umoven(tcp, addr, sizeof(sigset_t), &sigset) 135 * may be a bad idea: it'll try to read much more data than needed 136 * to fetch a sigset_t. 137 * Use (NSIG / 8) as a size instead. 138 */ 139 140const char * 141signame(int sig) 142{ 143 static char buf[sizeof("SIGRT_%d") + sizeof(int)*3]; 144 145 if (sig >= 0 && sig < nsignals) 146 return signalent[sig]; 147#ifdef SIGRTMIN 148 if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) { 149 sprintf(buf, "SIGRT_%d", (int)(sig - __SIGRTMIN)); 150 return buf; 151 } 152#endif 153 sprintf(buf, "%d", sig); 154 return buf; 155} 156 157static unsigned int 158popcount32(const uint32_t *a, unsigned int size) 159{ 160 unsigned int count = 0; 161 162 for (; size; ++a, --size) { 163 uint32_t x = *a; 164 165#ifdef HAVE___BUILTIN_POPCOUNT 166 count += __builtin_popcount(x); 167#else 168 for (; x; ++count) 169 x &= x - 1; 170#endif 171 } 172 173 return count; 174} 175 176static const char * 177sprintsigmask_n(const char *prefix, const void *sig_mask, unsigned int bytes) 178{ 179 /* 180 * The maximum number of signal names to be printed is NSIG * 2 / 3. 181 * Most of signal names have length 7, 182 * average length of signal names is less than 7. 183 * The length of prefix string does not exceed 16. 184 */ 185 static char outstr[128 + 8 * (NSIG * 2 / 3)]; 186 187 char *s; 188 const uint32_t *mask; 189 uint32_t inverted_mask[NSIG / 32]; 190 unsigned int size; 191 int i; 192 char sep; 193 194 s = stpcpy(outstr, prefix); 195 196 mask = sig_mask; 197 /* length of signal mask in 4-byte words */ 198 size = (bytes >= NSIG / 8) ? NSIG / 32 : (bytes + 3) / 4; 199 200 /* check whether 2/3 or more bits are set */ 201 if (popcount32(mask, size) >= size * 32 * 2 / 3) { 202 /* show those signals that are NOT in the mask */ 203 unsigned int j; 204 for (j = 0; j < size; ++j) 205 inverted_mask[j] = ~mask[j]; 206 mask = inverted_mask; 207 *s++ = '~'; 208 } 209 210 sep = '['; 211 for (i = 0; (i = next_set_bit(mask, i, size * 32)) >= 0; ) { 212 ++i; 213 *s++ = sep; 214 if (i < nsignals) { 215 s = stpcpy(s, signalent[i] + 3); 216 } 217#ifdef SIGRTMIN 218 else if (i >= __SIGRTMIN && i <= __SIGRTMAX) { 219 s += sprintf(s, "RT_%u", i - __SIGRTMIN); 220 } 221#endif 222 else { 223 s += sprintf(s, "%u", i); 224 } 225 sep = ' '; 226 } 227 if (sep == '[') 228 *s++ = sep; 229 *s++ = ']'; 230 *s = '\0'; 231 return outstr; 232} 233 234#define tprintsigmask_addr(prefix, mask) \ 235 tprints(sprintsigmask_n((prefix), (mask), sizeof(mask))) 236 237#define sprintsigmask_val(prefix, mask) \ 238 sprintsigmask_n((prefix), &(mask), sizeof(mask)) 239 240#define tprintsigmask_val(prefix, mask) \ 241 tprints(sprintsigmask_n((prefix), &(mask), sizeof(mask))) 242 243void 244printsignal(int nr) 245{ 246 tprints(signame(nr)); 247} 248 249void 250print_sigset_addr_len(struct tcb *tcp, long addr, long len) 251{ 252 char mask[NSIG / 8]; 253 254 if (!addr) { 255 tprints("NULL"); 256 return; 257 } 258 /* Here len is usually equals NSIG / 8 or current_wordsize. 259 * But we code this defensively: 260 */ 261 if (len < 0) { 262 bad: 263 tprintf("%#lx", addr); 264 return; 265 } 266 if (len >= NSIG / 8) 267 len = NSIG / 8; 268 else 269 len = (len + 3) & ~3; 270 271 if (umoven(tcp, addr, len, mask) < 0) 272 goto bad; 273 tprints(sprintsigmask_n("", mask, len)); 274} 275 276#ifndef ILL_ILLOPC 277#define ILL_ILLOPC 1 /* illegal opcode */ 278#define ILL_ILLOPN 2 /* illegal operand */ 279#define ILL_ILLADR 3 /* illegal addressing mode */ 280#define ILL_ILLTRP 4 /* illegal trap */ 281#define ILL_PRVOPC 5 /* privileged opcode */ 282#define ILL_PRVREG 6 /* privileged register */ 283#define ILL_COPROC 7 /* coprocessor error */ 284#define ILL_BADSTK 8 /* internal stack error */ 285#define FPE_INTDIV 1 /* integer divide by zero */ 286#define FPE_INTOVF 2 /* integer overflow */ 287#define FPE_FLTDIV 3 /* floating point divide by zero */ 288#define FPE_FLTOVF 4 /* floating point overflow */ 289#define FPE_FLTUND 5 /* floating point underflow */ 290#define FPE_FLTRES 6 /* floating point inexact result */ 291#define FPE_FLTINV 7 /* floating point invalid operation */ 292#define FPE_FLTSUB 8 /* subscript out of range */ 293#define SEGV_MAPERR 1 /* address not mapped to object */ 294#define SEGV_ACCERR 2 /* invalid permissions for mapped object */ 295#define BUS_ADRALN 1 /* invalid address alignment */ 296#define BUS_ADRERR 2 /* non-existant physical address */ 297#define BUS_OBJERR 3 /* object specific hardware error */ 298#define SYS_SECCOMP 1 /* seccomp triggered */ 299#define TRAP_BRKPT 1 /* process breakpoint */ 300#define TRAP_TRACE 2 /* process trace trap */ 301#define CLD_EXITED 1 /* child has exited */ 302#define CLD_KILLED 2 /* child was killed */ 303#define CLD_DUMPED 3 /* child terminated abnormally */ 304#define CLD_TRAPPED 4 /* traced child has trapped */ 305#define CLD_STOPPED 5 /* child has stopped */ 306#define CLD_CONTINUED 6 /* stopped child has continued */ 307#define POLL_IN 1 /* data input available */ 308#define POLL_OUT 2 /* output buffers available */ 309#define POLL_MSG 3 /* input message available */ 310#define POLL_ERR 4 /* i/o error */ 311#define POLL_PRI 5 /* high priority input available */ 312#define POLL_HUP 6 /* device disconnected */ 313#define SI_KERNEL 0x80 /* sent by kernel */ 314#define SI_USER 0 /* sent by kill, sigsend, raise */ 315#define SI_QUEUE -1 /* sent by sigqueue */ 316#define SI_TIMER -2 /* sent by timer expiration */ 317#define SI_MESGQ -3 /* sent by real time mesq state change */ 318#define SI_ASYNCIO -4 /* sent by AIO completion */ 319#define SI_SIGIO -5 /* sent by SIGIO */ 320#define SI_TKILL -6 /* sent by tkill */ 321#define SI_DETHREAD -7 /* sent by execve killing subsidiary threads */ 322#define SI_ASYNCNL -60 /* sent by asynch name lookup completion */ 323#endif 324 325#ifndef SI_FROMUSER 326# define SI_FROMUSER(sip) ((sip)->si_code <= 0) 327#endif 328 329#include "xlat/siginfo_codes.h" 330#include "xlat/sigill_codes.h" 331#include "xlat/sigfpe_codes.h" 332#include "xlat/sigtrap_codes.h" 333#include "xlat/sigchld_codes.h" 334#include "xlat/sigpoll_codes.h" 335#include "xlat/sigprof_codes.h" 336 337#ifdef SIGEMT 338#include "xlat/sigemt_codes.h" 339#endif 340 341#include "xlat/sigsegv_codes.h" 342#include "xlat/sigbus_codes.h" 343 344#ifndef SYS_SECCOMP 345# define SYS_SECCOMP 1 346#endif 347#include "xlat/sigsys_codes.h" 348 349static void 350printsigsource(const siginfo_t *sip) 351{ 352 tprintf(", si_pid=%lu, si_uid=%lu", 353 (unsigned long) sip->si_pid, 354 (unsigned long) sip->si_uid); 355} 356 357static void 358printsigval(const siginfo_t *sip, int verbose) 359{ 360 if (!verbose) 361 tprints(", ..."); 362 else 363 tprintf(", si_value={int=%u, ptr=%#lx}", 364 sip->si_int, 365 (unsigned long) sip->si_ptr); 366} 367 368void 369printsiginfo(siginfo_t *sip, int verbose) 370{ 371 const char *code; 372 373 if (sip->si_signo == 0) { 374 tprints("{}"); 375 return; 376 } 377 tprints("{si_signo="); 378 printsignal(sip->si_signo); 379 code = xlookup(siginfo_codes, sip->si_code); 380 if (!code) { 381 switch (sip->si_signo) { 382 case SIGTRAP: 383 code = xlookup(sigtrap_codes, sip->si_code); 384 break; 385 case SIGCHLD: 386 code = xlookup(sigchld_codes, sip->si_code); 387 break; 388 case SIGPOLL: 389 code = xlookup(sigpoll_codes, sip->si_code); 390 break; 391 case SIGPROF: 392 code = xlookup(sigprof_codes, sip->si_code); 393 break; 394 case SIGILL: 395 code = xlookup(sigill_codes, sip->si_code); 396 break; 397#ifdef SIGEMT 398 case SIGEMT: 399 code = xlookup(sigemt_codes, sip->si_code); 400 break; 401#endif 402 case SIGFPE: 403 code = xlookup(sigfpe_codes, sip->si_code); 404 break; 405 case SIGSEGV: 406 code = xlookup(sigsegv_codes, sip->si_code); 407 break; 408 case SIGBUS: 409 code = xlookup(sigbus_codes, sip->si_code); 410 break; 411 case SIGSYS: 412 code = xlookup(sigsys_codes, sip->si_code); 413 break; 414 } 415 } 416 if (code) 417 tprintf(", si_code=%s", code); 418 else 419 tprintf(", si_code=%#x", sip->si_code); 420#ifdef SI_NOINFO 421 if (sip->si_code != SI_NOINFO) 422#endif 423 { 424 if (sip->si_errno) { 425 if (sip->si_errno < 0 || sip->si_errno >= nerrnos) 426 tprintf(", si_errno=%d", sip->si_errno); 427 else 428 tprintf(", si_errno=%s", 429 errnoent[sip->si_errno]); 430 } 431#ifdef SI_FROMUSER 432 if (SI_FROMUSER(sip)) { 433 switch (sip->si_code) { 434#ifdef SI_USER 435 case SI_USER: 436 printsigsource(sip); 437 break; 438#endif 439#ifdef SI_TKILL 440 case SI_TKILL: 441 printsigsource(sip); 442 break; 443#endif 444#ifdef SI_TIMER 445 case SI_TIMER: 446 tprintf(", si_timerid=%#x, si_overrun=%d", 447 sip->si_timerid, sip->si_overrun); 448 printsigval(sip, verbose); 449 break; 450#endif 451 default: 452 printsigsource(sip); 453 if (sip->si_ptr) 454 printsigval(sip, verbose); 455 break; 456 } 457 } 458 else 459#endif /* SI_FROMUSER */ 460 { 461 switch (sip->si_signo) { 462 case SIGCHLD: 463 printsigsource(sip); 464 tprints(", si_status="); 465 if (sip->si_code == CLD_EXITED) 466 tprintf("%d", sip->si_status); 467 else 468 printsignal(sip->si_status); 469 if (!verbose) 470 tprints(", ..."); 471 else 472 tprintf(", si_utime=%llu, si_stime=%llu", 473 (unsigned long long) sip->si_utime, 474 (unsigned long long) sip->si_stime); 475 break; 476 case SIGILL: case SIGFPE: 477 case SIGSEGV: case SIGBUS: 478 tprintf(", si_addr=%#lx", 479 (unsigned long) sip->si_addr); 480 break; 481 case SIGPOLL: 482 switch (sip->si_code) { 483 case POLL_IN: case POLL_OUT: case POLL_MSG: 484 tprintf(", si_band=%ld", 485 (long) sip->si_band); 486 break; 487 } 488 break; 489#ifdef HAVE_SIGINFO_T_SI_SYSCALL 490 case SIGSYS: 491 tprintf(", si_call_addr=%#lx, si_syscall=%d, si_arch=%u", 492 (unsigned long) sip->si_call_addr, 493 sip->si_syscall, sip->si_arch); 494 break; 495#endif 496 default: 497 if (sip->si_pid || sip->si_uid) 498 printsigsource(sip); 499 if (sip->si_ptr) 500 printsigval(sip, verbose); 501 } 502 } 503 } 504 tprints("}"); 505} 506 507void 508printsiginfo_at(struct tcb *tcp, long addr) 509{ 510 siginfo_t si; 511 if (!addr) { 512 tprints("NULL"); 513 return; 514 } 515 if (syserror(tcp)) { 516 tprintf("%#lx", addr); 517 return; 518 } 519 if (umove(tcp, addr, &si) < 0) { 520 tprints("{???}"); 521 return; 522 } 523 printsiginfo(&si, verbose(tcp)); 524} 525 526int 527sys_sigsetmask(struct tcb *tcp) 528{ 529 if (entering(tcp)) { 530 tprintsigmask_val("", tcp->u_arg[0]); 531 } 532 else if (!syserror(tcp)) { 533 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval); 534 return RVAL_HEX | RVAL_STR; 535 } 536 return 0; 537} 538 539#ifdef HAVE_SIGACTION 540 541struct old_sigaction { 542 /* sa_handler may be a libc #define, need to use other name: */ 543#ifdef MIPS 544 unsigned int sa_flags; 545 void (*__sa_handler)(int); 546 /* Kernel treats sa_mask as an array of longs. */ 547 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1]; 548#else 549 void (*__sa_handler)(int); 550 unsigned long sa_mask; 551 unsigned long sa_flags; 552 void (*sa_restorer)(void); 553#endif /* !MIPS */ 554}; 555 556struct old_sigaction32 { 557 /* sa_handler may be a libc #define, need to use other name: */ 558 uint32_t __sa_handler; 559 uint32_t sa_mask; 560 uint32_t sa_flags; 561 uint32_t sa_restorer; 562}; 563 564static void 565decode_old_sigaction(struct tcb *tcp, long addr) 566{ 567 struct old_sigaction sa; 568 int r; 569 570 if (!addr) { 571 tprints("NULL"); 572 return; 573 } 574 if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) { 575 tprintf("%#lx", addr); 576 return; 577 } 578 579#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 580 if (current_wordsize != sizeof(sa.__sa_handler) && current_wordsize == 4) { 581 struct old_sigaction32 sa32; 582 r = umove(tcp, addr, &sa32); 583 if (r >= 0) { 584 memset(&sa, 0, sizeof(sa)); 585 sa.__sa_handler = (void*)(uintptr_t)sa32.__sa_handler; 586 sa.sa_flags = sa32.sa_flags; 587 sa.sa_restorer = (void*)(uintptr_t)sa32.sa_restorer; 588 sa.sa_mask = sa32.sa_mask; 589 } 590 } else 591#endif 592 { 593 r = umove(tcp, addr, &sa); 594 } 595 if (r < 0) { 596 tprints("{...}"); 597 return; 598 } 599 600 /* Architectures using function pointers, like 601 * hppa, may need to manipulate the function pointer 602 * to compute the result of a comparison. However, 603 * the __sa_handler function pointer exists only in 604 * the address space of the traced process, and can't 605 * be manipulated by strace. In order to prevent the 606 * compiler from generating code to manipulate 607 * __sa_handler we cast the function pointers to long. */ 608 if ((long)sa.__sa_handler == (long)SIG_ERR) 609 tprints("{SIG_ERR, "); 610 else if ((long)sa.__sa_handler == (long)SIG_DFL) 611 tprints("{SIG_DFL, "); 612 else if ((long)sa.__sa_handler == (long)SIG_IGN) 613 tprints("{SIG_IGN, "); 614 else 615 tprintf("{%#lx, ", (long) sa.__sa_handler); 616#ifdef MIPS 617 tprintsigmask_addr("", sa.sa_mask); 618#else 619 tprintsigmask_val("", sa.sa_mask); 620#endif 621 tprints(", "); 622 printflags(sigact_flags, sa.sa_flags, "SA_???"); 623#ifdef SA_RESTORER 624 if (sa.sa_flags & SA_RESTORER) 625 tprintf(", %p", sa.sa_restorer); 626#endif 627 tprints("}"); 628} 629 630int 631sys_sigaction(struct tcb *tcp) 632{ 633 if (entering(tcp)) { 634 printsignal(tcp->u_arg[0]); 635 tprints(", "); 636 decode_old_sigaction(tcp, tcp->u_arg[1]); 637 tprints(", "); 638 } else 639 decode_old_sigaction(tcp, tcp->u_arg[2]); 640 return 0; 641} 642 643int 644sys_signal(struct tcb *tcp) 645{ 646 if (entering(tcp)) { 647 printsignal(tcp->u_arg[0]); 648 tprints(", "); 649 switch (tcp->u_arg[1]) { 650 case (long) SIG_ERR: 651 tprints("SIG_ERR"); 652 break; 653 case (long) SIG_DFL: 654 tprints("SIG_DFL"); 655 break; 656 case (long) SIG_IGN: 657 tprints("SIG_IGN"); 658 break; 659 default: 660 tprintf("%#lx", tcp->u_arg[1]); 661 } 662 return 0; 663 } 664 else if (!syserror(tcp)) { 665 switch (tcp->u_rval) { 666 case (long) SIG_ERR: 667 tcp->auxstr = "SIG_ERR"; break; 668 case (long) SIG_DFL: 669 tcp->auxstr = "SIG_DFL"; break; 670 case (long) SIG_IGN: 671 tcp->auxstr = "SIG_IGN"; break; 672 default: 673 tcp->auxstr = NULL; 674 } 675 return RVAL_HEX | RVAL_STR; 676 } 677 return 0; 678} 679 680#endif /* HAVE_SIGACTION */ 681 682int 683sys_sigreturn(struct tcb *tcp) 684{ 685#if defined(ARM) 686 if (entering(tcp)) { 687 struct arm_sigcontext { 688 unsigned long trap_no; 689 unsigned long error_code; 690 unsigned long oldmask; 691 unsigned long arm_r0; 692 unsigned long arm_r1; 693 unsigned long arm_r2; 694 unsigned long arm_r3; 695 unsigned long arm_r4; 696 unsigned long arm_r5; 697 unsigned long arm_r6; 698 unsigned long arm_r7; 699 unsigned long arm_r8; 700 unsigned long arm_r9; 701 unsigned long arm_r10; 702 unsigned long arm_fp; 703 unsigned long arm_ip; 704 unsigned long arm_sp; 705 unsigned long arm_lr; 706 unsigned long arm_pc; 707 unsigned long arm_cpsr; 708 unsigned long fault_address; 709 }; 710 struct arm_ucontext { 711 unsigned long uc_flags; 712 unsigned long uc_link; /* struct ucontext* */ 713 /* The next three members comprise stack_t struct: */ 714 unsigned long ss_sp; /* void* */ 715 unsigned long ss_flags; /* int */ 716 unsigned long ss_size; /* size_t */ 717 struct arm_sigcontext sc; 718 /* These two members are sigset_t: */ 719 unsigned long uc_sigmask[2]; 720 /* more fields follow, which we aren't interested in */ 721 }; 722 struct arm_ucontext uc; 723 if (umove(tcp, arm_regs.ARM_sp, &uc) < 0) 724 return 0; 725 /* 726 * Kernel fills out uc.sc.oldmask too when it sets up signal stack, 727 * but for sigmask restore, sigreturn syscall uses uc.uc_sigmask instead. 728 */ 729 tprintsigmask_addr(") (mask ", uc.uc_sigmask); 730 } 731#elif defined(S390) || defined(S390X) 732 if (entering(tcp)) { 733 long usp; 734 struct sigcontext sc; 735 if (upeek(tcp->pid, PT_GPR15, &usp) < 0) 736 return 0; 737 if (umove(tcp, usp + __SIGNAL_FRAMESIZE, &sc) < 0) 738 return 0; 739 tprintsigmask_addr(") (mask ", sc.oldmask); 740 } 741#elif defined(I386) || defined(X86_64) 742# if defined(X86_64) 743 if (current_personality == 0) /* 64-bit */ 744 return 0; 745# endif 746 if (entering(tcp)) { 747 struct i386_sigcontext_struct { 748 uint16_t gs, __gsh; 749 uint16_t fs, __fsh; 750 uint16_t es, __esh; 751 uint16_t ds, __dsh; 752 uint32_t edi; 753 uint32_t esi; 754 uint32_t ebp; 755 uint32_t esp; 756 uint32_t ebx; 757 uint32_t edx; 758 uint32_t ecx; 759 uint32_t eax; 760 uint32_t trapno; 761 uint32_t err; 762 uint32_t eip; 763 uint16_t cs, __csh; 764 uint32_t eflags; 765 uint32_t esp_at_signal; 766 uint16_t ss, __ssh; 767 uint32_t i387; 768 uint32_t oldmask; 769 uint32_t cr2; 770 }; 771 struct i386_fpstate { 772 uint32_t cw; 773 uint32_t sw; 774 uint32_t tag; 775 uint32_t ipoff; 776 uint32_t cssel; 777 uint32_t dataoff; 778 uint32_t datasel; 779 uint8_t st[8][10]; /* 8*10 bytes: FP regs */ 780 uint16_t status; 781 uint16_t magic; 782 uint32_t fxsr_env[6]; 783 uint32_t mxcsr; 784 uint32_t reserved; 785 uint8_t stx[8][16]; /* 8*16 bytes: FP regs, each padded to 16 bytes */ 786 uint8_t xmm[8][16]; /* 8 XMM regs */ 787 uint32_t padding1[44]; 788 uint32_t padding2[12]; /* union with struct _fpx_sw_bytes */ 789 }; 790 struct { 791 struct i386_sigcontext_struct sc; 792 struct i386_fpstate fp; 793 uint32_t extramask[1]; 794 } signal_stack; 795 /* On i386, sc is followed on stack by struct fpstate 796 * and after it an additional u32 extramask[1] which holds 797 * upper half of the mask. 798 */ 799 uint32_t sigmask[2]; 800 if (umove(tcp, *i386_esp_ptr, &signal_stack) < 0) 801 return 0; 802 sigmask[0] = signal_stack.sc.oldmask; 803 sigmask[1] = signal_stack.extramask[0]; 804 tprintsigmask_addr(") (mask ", sigmask); 805 } 806#elif defined(IA64) 807 if (entering(tcp)) { 808 struct sigcontext sc; 809 long sp; 810 /* offset of sigcontext in the kernel's sigframe structure: */ 811# define SIGFRAME_SC_OFFSET 0x90 812 if (upeek(tcp->pid, PT_R12, &sp) < 0) 813 return 0; 814 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0) 815 return 0; 816 tprintsigmask_val(") (mask ", sc.sc_mask); 817 } 818#elif defined(POWERPC) 819 if (entering(tcp)) { 820 long esp; 821 struct sigcontext sc; 822 823 esp = ppc_regs.gpr[1]; 824 825 /* Skip dummy stack frame. */ 826#ifdef POWERPC64 827 if (current_personality == 0) 828 esp += 128; 829 else 830 esp += 64; 831#else 832 esp += 64; 833#endif 834 if (umove(tcp, esp, &sc) < 0) 835 return 0; 836 tprintsigmask_val(") (mask ", sc.oldmask); 837 } 838#elif defined(M68K) 839 if (entering(tcp)) { 840 long usp; 841 struct sigcontext sc; 842 if (upeek(tcp->pid, 4*PT_USP, &usp) < 0) 843 return 0; 844 if (umove(tcp, usp, &sc) < 0) 845 return 0; 846 tprintsigmask_val(") (mask ", sc.sc_mask); 847 } 848#elif defined(ALPHA) 849 if (entering(tcp)) { 850 long fp; 851 struct sigcontext sc; 852 if (upeek(tcp->pid, REG_FP, &fp) < 0) 853 return 0; 854 if (umove(tcp, fp, &sc) < 0) 855 return 0; 856 tprintsigmask_val(") (mask ", sc.sc_mask); 857 } 858#elif defined(SPARC) || defined(SPARC64) 859 if (entering(tcp)) { 860 long i1; 861 m_siginfo_t si; 862 i1 = sparc_regs.u_regs[U_REG_O1]; 863 if (umove(tcp, i1, &si) < 0) { 864 perror_msg("sigreturn: umove"); 865 return 0; 866 } 867 tprintsigmask_val(") (mask ", si.si_mask); 868 } 869#elif defined(LINUX_MIPSN32) || defined(LINUX_MIPSN64) 870 /* This decodes rt_sigreturn. The 64-bit ABIs do not have 871 sigreturn. */ 872 if (entering(tcp)) { 873 long sp; 874 struct ucontext uc; 875 if (upeek(tcp->pid, REG_SP, &sp) < 0) 876 return 0; 877 /* There are six words followed by a 128-byte siginfo. */ 878 sp = sp + 6 * 4 + 128; 879 if (umove(tcp, sp, &uc) < 0) 880 return 0; 881 tprintsigmask_val(") (mask ", uc.uc_sigmask); 882 } 883#elif defined(MIPS) 884 if (entering(tcp)) { 885 long sp; 886 struct pt_regs regs; 887 m_siginfo_t si; 888 if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)®s, 0) < 0) { 889 perror_msg("sigreturn: PTRACE_GETREGS"); 890 return 0; 891 } 892 sp = regs.regs[29]; 893 if (umove(tcp, sp, &si) < 0) 894 return 0; 895 tprintsigmask_val(") (mask ", si.si_mask); 896 } 897#elif defined(CRISV10) || defined(CRISV32) 898 if (entering(tcp)) { 899 struct sigcontext sc; 900 long regs[PT_MAX+1]; 901 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) { 902 perror_msg("sigreturn: PTRACE_GETREGS"); 903 return 0; 904 } 905 if (umove(tcp, regs[PT_USP], &sc) < 0) 906 return 0; 907 tprintsigmask_val(") (mask ", sc.oldmask); 908 } 909#elif defined(TILE) 910 if (entering(tcp)) { 911 struct ucontext uc; 912 913 /* offset of ucontext in the kernel's sigframe structure */ 914# define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(siginfo_t) 915 if (umove(tcp, tile_regs.sp + SIGFRAME_UC_OFFSET, &uc) < 0) 916 return 0; 917 tprintsigmask_val(") (mask ", uc.uc_sigmask); 918 } 919#elif defined(MICROBLAZE) 920 /* TODO: Verify that this is correct... */ 921 if (entering(tcp)) { 922 struct sigcontext sc; 923 long sp; 924 /* Read r1, the stack pointer. */ 925 if (upeek(tcp->pid, 1 * 4, &sp) < 0) 926 return 0; 927 if (umove(tcp, sp, &sc) < 0) 928 return 0; 929 tprintsigmask_val(") (mask ", sc.oldmask); 930 } 931#elif defined(XTENSA) 932 /* Xtensa only has rt_sys_sigreturn */ 933#elif defined(ARC) 934 /* ARC syscall ABI only supports rt_sys_sigreturn */ 935#else 936# warning No sys_sigreturn() for this architecture 937# warning (no problem, just a reminder :-) 938#endif 939 return 0; 940} 941 942int 943sys_siggetmask(struct tcb *tcp) 944{ 945 if (exiting(tcp)) { 946 tcp->auxstr = sprintsigmask_val("mask ", tcp->u_rval); 947 } 948 return RVAL_HEX | RVAL_STR; 949} 950 951int 952sys_sigsuspend(struct tcb *tcp) 953{ 954 if (entering(tcp)) { 955 tprintsigmask_val("", tcp->u_arg[2]); 956 } 957 return 0; 958} 959 960#if !defined SS_ONSTACK 961#define SS_ONSTACK 1 962#define SS_DISABLE 2 963#endif 964 965#include "xlat/sigaltstack_flags.h" 966 967static void 968print_stack_t(struct tcb *tcp, unsigned long addr) 969{ 970 stack_t ss; 971 int r; 972 973 if (!addr) { 974 tprints("NULL"); 975 return; 976 } 977 978#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 979 if (current_wordsize != sizeof(ss.ss_sp) && current_wordsize == 4) { 980 struct { 981 uint32_t ss_sp; 982 int32_t ss_flags; 983 uint32_t ss_size; 984 } ss32; 985 r = umove(tcp, addr, &ss32); 986 if (r >= 0) { 987 memset(&ss, 0, sizeof(ss)); 988 ss.ss_sp = (void*)(unsigned long) ss32.ss_sp; 989 ss.ss_flags = ss32.ss_flags; 990 ss.ss_size = (unsigned long) ss32.ss_size; 991 } 992 } else 993#endif 994 { 995 r = umove(tcp, addr, &ss); 996 } 997 if (r < 0) { 998 tprintf("%#lx", addr); 999 } else { 1000 tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp); 1001 printflags(sigaltstack_flags, ss.ss_flags, "SS_???"); 1002 tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size); 1003 } 1004} 1005 1006int 1007sys_sigaltstack(struct tcb *tcp) 1008{ 1009 if (entering(tcp)) { 1010 print_stack_t(tcp, tcp->u_arg[0]); 1011 } 1012 else { 1013 tprints(", "); 1014 print_stack_t(tcp, tcp->u_arg[1]); 1015 } 1016 return 0; 1017} 1018 1019#ifdef HAVE_SIGACTION 1020 1021/* "Old" sigprocmask, which operates with word-sized signal masks */ 1022int 1023sys_sigprocmask(struct tcb *tcp) 1024{ 1025# ifdef ALPHA 1026 if (entering(tcp)) { 1027 /* 1028 * Alpha/OSF is different: it doesn't pass in two pointers, 1029 * but rather passes in the new bitmask as an argument and 1030 * then returns the old bitmask. This "works" because we 1031 * only have 64 signals to worry about. If you want more, 1032 * use of the rt_sigprocmask syscall is required. 1033 * Alpha: 1034 * old = osf_sigprocmask(how, new); 1035 * Everyone else: 1036 * ret = sigprocmask(how, &new, &old, ...); 1037 */ 1038 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 1039 tprintsigmask_val(", ", tcp->u_arg[1]); 1040 } 1041 else if (!syserror(tcp)) { 1042 tcp->auxstr = sprintsigmask_val("old mask ", tcp->u_rval); 1043 return RVAL_HEX | RVAL_STR; 1044 } 1045# else /* !ALPHA */ 1046 if (entering(tcp)) { 1047 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 1048 tprints(", "); 1049 print_sigset_addr_len(tcp, tcp->u_arg[1], current_wordsize); 1050 tprints(", "); 1051 } 1052 else { 1053 if (syserror(tcp)) 1054 tprintf("%#lx", tcp->u_arg[2]); 1055 else 1056 print_sigset_addr_len(tcp, tcp->u_arg[2], current_wordsize); 1057 } 1058# endif /* !ALPHA */ 1059 return 0; 1060} 1061 1062#endif /* HAVE_SIGACTION */ 1063 1064int 1065sys_kill(struct tcb *tcp) 1066{ 1067 if (entering(tcp)) { 1068 tprintf("%ld, %s", 1069 widen_to_long(tcp->u_arg[0]), 1070 signame(tcp->u_arg[1]) 1071 ); 1072 } 1073 return 0; 1074} 1075 1076int 1077sys_tgkill(struct tcb *tcp) 1078{ 1079 if (entering(tcp)) { 1080 tprintf("%ld, %ld, %s", 1081 widen_to_long(tcp->u_arg[0]), 1082 widen_to_long(tcp->u_arg[1]), 1083 signame(tcp->u_arg[2]) 1084 ); 1085 } 1086 return 0; 1087} 1088 1089int 1090sys_sigpending(struct tcb *tcp) 1091{ 1092 if (exiting(tcp)) { 1093 if (syserror(tcp)) 1094 tprintf("%#lx", tcp->u_arg[0]); 1095 else 1096 print_sigset_addr_len(tcp, tcp->u_arg[0], current_wordsize); 1097 } 1098 return 0; 1099} 1100 1101int 1102sys_rt_sigprocmask(struct tcb *tcp) 1103{ 1104 /* Note: arg[3] is the length of the sigset. Kernel requires NSIG / 8 */ 1105 if (entering(tcp)) { 1106 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???"); 1107 tprints(", "); 1108 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[3]); 1109 tprints(", "); 1110 } 1111 else { 1112 if (syserror(tcp)) 1113 tprintf("%#lx", tcp->u_arg[2]); 1114 else 1115 print_sigset_addr_len(tcp, tcp->u_arg[2], tcp->u_arg[3]); 1116 tprintf(", %lu", tcp->u_arg[3]); 1117 } 1118 return 0; 1119} 1120 1121/* Structure describing the action to be taken when a signal arrives. */ 1122struct new_sigaction 1123{ 1124 /* sa_handler may be a libc #define, need to use other name: */ 1125#ifdef MIPS 1126 unsigned int sa_flags; 1127 void (*__sa_handler)(int); 1128#else 1129 void (*__sa_handler)(int); 1130 unsigned long sa_flags; 1131 void (*sa_restorer)(void); 1132#endif /* !MIPS */ 1133 /* Kernel treats sa_mask as an array of longs. */ 1134 unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1]; 1135}; 1136/* Same for i386-on-x86_64 and similar cases */ 1137struct new_sigaction32 1138{ 1139 uint32_t __sa_handler; 1140 uint32_t sa_flags; 1141 uint32_t sa_restorer; 1142 uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)]; 1143}; 1144 1145static void 1146decode_new_sigaction(struct tcb *tcp, long addr) 1147{ 1148 struct new_sigaction sa; 1149 int r; 1150 1151 if (!addr) { 1152 tprints("NULL"); 1153 return; 1154 } 1155 if (!verbose(tcp) || (exiting(tcp) && syserror(tcp))) { 1156 tprintf("%#lx", addr); 1157 return; 1158 } 1159#if SUPPORTED_PERSONALITIES > 1 && SIZEOF_LONG > 4 1160 if (current_wordsize != sizeof(sa.sa_flags) && current_wordsize == 4) { 1161 struct new_sigaction32 sa32; 1162 r = umove(tcp, addr, &sa32); 1163 if (r >= 0) { 1164 memset(&sa, 0, sizeof(sa)); 1165 sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler; 1166 sa.sa_flags = sa32.sa_flags; 1167 sa.sa_restorer = (void*)(unsigned long)sa32.sa_restorer; 1168 /* Kernel treats sa_mask as an array of longs. 1169 * For 32-bit process, "long" is uint32_t, thus, for example, 1170 * 32th bit in sa_mask will end up as bit 0 in sa_mask[1]. 1171 * But for (64-bit) kernel, 32th bit in sa_mask is 1172 * 32th bit in 0th (64-bit) long! 1173 * For little-endian, it's the same. 1174 * For big-endian, we swap 32-bit words. 1175 */ 1176 sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32); 1177 } 1178 } else 1179#endif 1180 { 1181 r = umove(tcp, addr, &sa); 1182 } 1183 if (r < 0) { 1184 tprints("{...}"); 1185 return; 1186 } 1187 /* Architectures using function pointers, like 1188 * hppa, may need to manipulate the function pointer 1189 * to compute the result of a comparison. However, 1190 * the __sa_handler function pointer exists only in 1191 * the address space of the traced process, and can't 1192 * be manipulated by strace. In order to prevent the 1193 * compiler from generating code to manipulate 1194 * __sa_handler we cast the function pointers to long. */ 1195 if ((long)sa.__sa_handler == (long)SIG_ERR) 1196 tprints("{SIG_ERR, "); 1197 else if ((long)sa.__sa_handler == (long)SIG_DFL) 1198 tprints("{SIG_DFL, "); 1199 else if ((long)sa.__sa_handler == (long)SIG_IGN) 1200 tprints("{SIG_IGN, "); 1201 else 1202 tprintf("{%#lx, ", (long) sa.__sa_handler); 1203 /* 1204 * Sigset size is in tcp->u_arg[4] (SPARC) 1205 * or in tcp->u_arg[3] (all other), 1206 * but kernel won't handle sys_rt_sigaction 1207 * with wrong sigset size (just returns EINVAL instead). 1208 * We just fetch the right size, which is NSIG / 8. 1209 */ 1210 tprintsigmask_val("", sa.sa_mask); 1211 tprints(", "); 1212 1213 printflags(sigact_flags, sa.sa_flags, "SA_???"); 1214#ifdef SA_RESTORER 1215 if (sa.sa_flags & SA_RESTORER) 1216 tprintf(", %p", sa.sa_restorer); 1217#endif 1218 tprints("}"); 1219} 1220 1221int 1222sys_rt_sigaction(struct tcb *tcp) 1223{ 1224 if (entering(tcp)) { 1225 printsignal(tcp->u_arg[0]); 1226 tprints(", "); 1227 decode_new_sigaction(tcp, tcp->u_arg[1]); 1228 tprints(", "); 1229 } else { 1230 decode_new_sigaction(tcp, tcp->u_arg[2]); 1231#if defined(SPARC) || defined(SPARC64) 1232 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]); 1233#elif defined(ALPHA) 1234 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]); 1235#else 1236 tprintf(", %lu", tcp->u_arg[3]); 1237#endif 1238 } 1239 return 0; 1240} 1241 1242int 1243sys_rt_sigpending(struct tcb *tcp) 1244{ 1245 if (exiting(tcp)) { 1246 /* 1247 * One of the few syscalls where sigset size (arg[1]) 1248 * is allowed to be <= NSIG / 8, not strictly ==. 1249 * This allows non-rt sigpending() syscall 1250 * to reuse rt_sigpending() code in kernel. 1251 */ 1252 if (syserror(tcp)) 1253 tprintf("%#lx", tcp->u_arg[0]); 1254 else 1255 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]); 1256 tprintf(", %lu", tcp->u_arg[1]); 1257 } 1258 return 0; 1259} 1260 1261int 1262sys_rt_sigsuspend(struct tcb *tcp) 1263{ 1264 if (entering(tcp)) { 1265 /* NB: kernel requires arg[1] == NSIG / 8 */ 1266 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[1]); 1267 tprintf(", %lu", tcp->u_arg[1]); 1268 } 1269 return 0; 1270} 1271 1272static void 1273print_sigqueueinfo(struct tcb *tcp, int sig, unsigned long uinfo) 1274{ 1275 printsignal(sig); 1276 tprints(", "); 1277 printsiginfo_at(tcp, uinfo); 1278} 1279 1280int 1281sys_rt_sigqueueinfo(struct tcb *tcp) 1282{ 1283 if (entering(tcp)) { 1284 tprintf("%lu, ", tcp->u_arg[0]); 1285 print_sigqueueinfo(tcp, tcp->u_arg[1], tcp->u_arg[2]); 1286 } 1287 return 0; 1288} 1289 1290int 1291sys_rt_tgsigqueueinfo(struct tcb *tcp) 1292{ 1293 if (entering(tcp)) { 1294 tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]); 1295 print_sigqueueinfo(tcp, tcp->u_arg[2], tcp->u_arg[3]); 1296 } 1297 return 0; 1298} 1299 1300int sys_rt_sigtimedwait(struct tcb *tcp) 1301{ 1302 /* NB: kernel requires arg[3] == NSIG / 8 */ 1303 if (entering(tcp)) { 1304 print_sigset_addr_len(tcp, tcp->u_arg[0], tcp->u_arg[3]); 1305 tprints(", "); 1306 /* This is the only "return" parameter, */ 1307 if (tcp->u_arg[1] != 0) 1308 return 0; 1309 /* ... if it's NULL, can decode all on entry */ 1310 tprints("NULL, "); 1311 } 1312 else if (tcp->u_arg[1] != 0) { 1313 /* syscall exit, and u_arg[1] wasn't NULL */ 1314 printsiginfo_at(tcp, tcp->u_arg[1]); 1315 tprints(", "); 1316 } 1317 else { 1318 /* syscall exit, and u_arg[1] was NULL */ 1319 return 0; 1320 } 1321 print_timespec(tcp, tcp->u_arg[2]); 1322 tprintf(", %lu", tcp->u_arg[3]); 1323 return 0; 1324}; 1325 1326int 1327sys_restart_syscall(struct tcb *tcp) 1328{ 1329 if (entering(tcp)) 1330 tprints("<... resuming interrupted call ...>"); 1331 return 0; 1332} 1333 1334static int 1335do_signalfd(struct tcb *tcp, int flags_arg) 1336{ 1337 /* NB: kernel requires arg[2] == NSIG / 8 */ 1338 if (entering(tcp)) { 1339 printfd(tcp, tcp->u_arg[0]); 1340 tprints(", "); 1341 print_sigset_addr_len(tcp, tcp->u_arg[1], tcp->u_arg[2]); 1342 tprintf(", %lu", tcp->u_arg[2]); 1343 if (flags_arg >= 0) { 1344 tprints(", "); 1345 printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???"); 1346 } 1347 } 1348 return 0; 1349} 1350 1351int 1352sys_signalfd(struct tcb *tcp) 1353{ 1354 return do_signalfd(tcp, -1); 1355} 1356 1357int 1358sys_signalfd4(struct tcb *tcp) 1359{ 1360 return do_signalfd(tcp, 3); 1361} 1362