granicus.if.org Git - strace/blob - signal.c

   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  *      $Id$
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <stdint.h>
  39 #include <signal.h>
  40 #include <sys/user.h>
  41 #include <fcntl.h>
  42
  43 #ifdef SVR4
  44 #include <sys/ucontext.h>
  45 #endif /* SVR4 */
  46
  47 #ifdef HAVE_SYS_REG_H
  48 # include <sys/reg.h>
  49 #ifndef PTRACE_PEEKUSR
  50 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  51 #endif
  52 #ifndef PTRACE_POKEUSR
  53 # define PTRACE_POKEUSR PTRACE_POKEUSER
  54 #endif
  55 #elif defined(HAVE_LINUX_PTRACE_H)
  56 #undef PTRACE_SYSCALL
  57 # ifdef HAVE_STRUCT_IA64_FPREG
  58 #  define ia64_fpreg XXX_ia64_fpreg
  59 # endif
  60 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
  61 #  define pt_all_user_regs XXX_pt_all_user_regs
  62 # endif
  63 #include <linux/ptrace.h>
  64 # undef ia64_fpreg
  65 # undef pt_all_user_regs
  66 #endif
  67
  68
  69 #ifdef LINUX
  70
  71 #ifdef IA64
  72 # include <asm/ptrace_offsets.h>
  73 #endif /* !IA64 */
  74
  75 #if defined (LINUX) && defined (SPARC64)
  76 # undef PTRACE_GETREGS
  77 # define PTRACE_GETREGS PTRACE_GETREGS64
  78 # undef PTRACE_SETREGS
  79 # define PTRACE_SETREGS PTRACE_SETREGS64
  80 #endif /* LINUX && SPARC64 */
  81
  82 #if defined (SPARC) || defined (SPARC64) || defined (MIPS)
  83 typedef struct {
  84         struct pt_regs          si_regs;
  85         int                     si_mask;
  86 } m_siginfo_t;
  87 #elif defined HAVE_ASM_SIGCONTEXT_H
  88 #if !defined(IA64) && !defined(X86_64)
  89 #include <asm/sigcontext.h>
  90 #endif /* !IA64 && !X86_64 */
  91 #else /* !HAVE_ASM_SIGCONTEXT_H */
  92 #if defined I386 && !defined HAVE_STRUCT_SIGCONTEXT_STRUCT
  93 struct sigcontext_struct {
  94         unsigned short gs, __gsh;
  95         unsigned short fs, __fsh;
  96         unsigned short es, __esh;
  97         unsigned short ds, __dsh;
  98         unsigned long edi;
  99         unsigned long esi;
 100         unsigned long ebp;
 101         unsigned long esp;
 102         unsigned long ebx;
 103         unsigned long edx;
 104         unsigned long ecx;
 105         unsigned long eax;
 106         unsigned long trapno;
 107         unsigned long err;
 108         unsigned long eip;
 109         unsigned short cs, __csh;
 110         unsigned long eflags;
 111         unsigned long esp_at_signal;
 112         unsigned short ss, __ssh;
 113         unsigned long i387;
 114         unsigned long oldmask;
 115         unsigned long cr2;
 116 };
 117 #else /* !I386 */
 118 #if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT
 119 struct sigcontext
 120 {
 121         unsigned long sc_mask;
 122         unsigned long sc_usp;
 123         unsigned long sc_d0;
 124         unsigned long sc_d1;
 125         unsigned long sc_a0;
 126         unsigned long sc_a1;
 127         unsigned short sc_sr;
 128         unsigned long sc_pc;
 129         unsigned short sc_formatvec;
 130 };
 131 #endif /* M68K */
 132 #endif /* !I386 */
 133 #endif /* !HAVE_ASM_SIGCONTEXT_H */
 134 #ifndef NSIG
 135 #define NSIG 32
 136 #endif
 137 #ifdef ARM
 138 #undef NSIG
 139 #define NSIG 32
 140 #endif
 141 #endif /* LINUX */
 142
 143 const char *const signalent0[] = {
 144 #include "signalent.h"
 145 };
 146 const int nsignals0 = sizeof signalent0 / sizeof signalent0[0];
 147
 148 #if SUPPORTED_PERSONALITIES >= 2
 149 const char *const signalent1[] = {
 150 #include "signalent1.h"
 151 };
 152 const int nsignals1 = sizeof signalent1 / sizeof signalent1[0];
 153 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 154
 155 #if SUPPORTED_PERSONALITIES >= 3
 156 const char *const signalent2[] = {
 157 #include "signalent2.h"
 158 };
 159 const int nsignals2 = sizeof signalent2 / sizeof signalent2[0];
 160 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 161
 162 const char *const *signalent;
 163 int nsignals;
 164
 165 #if defined(SUNOS4) || defined(FREEBSD)
 166
 167 static const struct xlat sigvec_flags[] = {
 168         { SV_ONSTACK,   "SV_ONSTACK"    },
 169         { SV_INTERRUPT, "SV_INTERRUPT"  },
 170         { SV_RESETHAND, "SV_RESETHAND"  },
 171         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 172         { 0,            NULL            },
 173 };
 174
 175 #endif /* SUNOS4 || FREEBSD */
 176
 177 #ifdef HAVE_SIGACTION
 178
 179 #if defined LINUX && (defined I386 || defined X86_64)
 180 /* The libc headers do not define this constant since it should only be
 181    used by the implementation.  So wwe define it here.  */
 182 # ifndef SA_RESTORER
 183 #  define SA_RESTORER 0x04000000
 184 # endif
 185 #endif
 186
 187 static const struct xlat sigact_flags[] = {
 188 #ifdef SA_RESTORER
 189         { SA_RESTORER,  "SA_RESTORER"   },
 190 #endif
 191 #ifdef SA_STACK
 192         { SA_STACK,     "SA_STACK"      },
 193 #endif
 194 #ifdef SA_RESTART
 195         { SA_RESTART,   "SA_RESTART"    },
 196 #endif
 197 #ifdef SA_INTERRUPT
 198         { SA_INTERRUPT, "SA_INTERRUPT"  },
 199 #endif
 200 #ifdef SA_NODEFER
 201         { SA_NODEFER,   "SA_NODEFER"    },
 202 #endif
 203 #if defined SA_NOMASK && SA_NODEFER != SA_NOMASK
 204         { SA_NOMASK,    "SA_NOMASK"     },
 205 #endif
 206 #ifdef SA_RESETHAND
 207         { SA_RESETHAND, "SA_RESETHAND"  },
 208 #endif
 209 #if defined SA_ONESHOT && SA_ONESHOT != SA_RESETHAND
 210         { SA_ONESHOT,   "SA_ONESHOT"    },
 211 #endif
 212 #ifdef SA_SIGINFO
 213         { SA_SIGINFO,   "SA_SIGINFO"    },
 214 #endif
 215 #ifdef SA_RESETHAND
 216         { SA_RESETHAND, "SA_RESETHAND"  },
 217 #endif
 218 #ifdef SA_ONSTACK
 219         { SA_ONSTACK,   "SA_ONSTACK"    },
 220 #endif
 221 #ifdef SA_NODEFER
 222         { SA_NODEFER,   "SA_NODEFER"    },
 223 #endif
 224 #ifdef SA_NOCLDSTOP
 225         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 226 #endif
 227 #ifdef SA_NOCLDWAIT
 228         { SA_NOCLDWAIT, "SA_NOCLDWAIT"  },
 229 #endif
 230 #ifdef _SA_BSDCALL
 231         { _SA_BSDCALL,  "_SA_BSDCALL"   },
 232 #endif
 233 #ifdef SA_NOPTRACE
 234         { SA_NOPTRACE,  "SA_NOPTRACE"   },
 235 #endif
 236         { 0,            NULL            },
 237 };
 238
 239 static const struct xlat sigprocmaskcmds[] = {
 240         { SIG_BLOCK,    "SIG_BLOCK"     },
 241         { SIG_UNBLOCK,  "SIG_UNBLOCK"   },
 242         { SIG_SETMASK,  "SIG_SETMASK"   },
 243 #ifdef SIG_SETMASK32
 244         { SIG_SETMASK32,"SIG_SETMASK32" },
 245 #endif
 246         { 0,            NULL            },
 247 };
 248
 249 #endif /* HAVE_SIGACTION */
 250
 251 /* Anonymous realtime signals. */
 252 /* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a
 253    constant.  This is what we want.  Otherwise, just use SIGRTMIN. */
 254 #ifdef SIGRTMIN
 255 #ifndef __SIGRTMIN
 256 #define __SIGRTMIN SIGRTMIN
 257 #define __SIGRTMAX SIGRTMAX /* likewise */
 258 #endif
 259 #endif
 260
 261 const char *
 262 signame(sig)
 263 int sig;
 264 {
 265         static char buf[30];
 266         if (sig >= 0 && sig < nsignals) {
 267                 return signalent[sig];
 268 #ifdef SIGRTMIN
 269         } else if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) {
 270                 sprintf(buf, "SIGRT_%ld", (long)(sig - __SIGRTMIN));
 271                 return buf;
 272 #endif /* SIGRTMIN */
 273         } else {
 274                 sprintf(buf, "%d", sig);
 275                 return buf;
 276         }
 277 }
 278
 279 #ifndef UNIXWARE
 280 static void
 281 long_to_sigset(l, s)
 282 long l;
 283 sigset_t *s;
 284 {
 285         sigemptyset(s);
 286         *(long *)s = l;
 287 }
 288 #endif
 289
 290 static int
 291 copy_sigset_len(tcp, addr, s, len)
 292 struct tcb *tcp;
 293 long addr;
 294 sigset_t *s;
 295 int len;
 296 {
 297         if (len > sizeof(*s))
 298                 len = sizeof(*s);
 299         sigemptyset(s);
 300         if (umoven(tcp, addr, len, (char *)s) < 0)
 301                 return -1;
 302         return 0;
 303 }
 304
 305 #ifdef LINUX
 306 /* Original sigset is unsigned long */
 307 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(long))
 308 #else
 309 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(sigset_t))
 310 #endif
 311
 312 static const char *
 313 sprintsigmask(const char *str, sigset_t *mask, int rt)
 314 /* set might include realtime sigs */
 315 {
 316         int i, nsigs;
 317         int maxsigs;
 318         char *format, *s;
 319         static char outstr[8 * sizeof(sigset_t) * 8];
 320
 321         strcpy(outstr, str);
 322         s = outstr + strlen(outstr);
 323         nsigs = 0;
 324         maxsigs = nsignals;
 325 #ifdef __SIGRTMAX
 326         if (rt)
 327                 maxsigs = __SIGRTMAX; /* instead */
 328 #endif
 329         for (i = 1; i < maxsigs; i++) {
 330                 if (sigismember(mask, i) == 1)
 331                         nsigs++;
 332         }
 333         if (nsigs >= nsignals * 2 / 3) {
 334                 *s++ = '~';
 335                 for (i = 1; i < maxsigs; i++) {
 336                         switch (sigismember(mask, i)) {
 337                         case 1:
 338                                 sigdelset(mask, i);
 339                                 break;
 340                         case 0:
 341                                 sigaddset(mask, i);
 342                                 break;
 343                         }
 344                 }
 345         }
 346         format = "%s";
 347         *s++ = '[';
 348         for (i = 1; i < maxsigs; i++) {
 349                 if (sigismember(mask, i) == 1) {
 350                         /* real-time signals on solaris don't have
 351                          * signalent entries
 352                          */
 353                         if (i < nsignals) {
 354                                 sprintf(s, format, signalent[i] + 3);
 355                         }
 356 #ifdef SIGRTMIN
 357                         else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
 358                                 char tsig[40];
 359                                 sprintf(tsig, "RT_%u", i - __SIGRTMIN);
 360                                 sprintf(s, format, tsig);
 361                         }
 362 #endif /* SIGRTMIN */
 363                         else {
 364                                 char tsig[32];
 365                                 sprintf(tsig, "%u", i);
 366                                 sprintf(s, format, tsig);
 367                         }
 368                         s += strlen(s);
 369                         format = " %s";
 370                 }
 371         }
 372         *s++ = ']';
 373         *s = '\0';
 374         return outstr;
 375 }
 376
 377 static void
 378 printsigmask(mask, rt)
 379 sigset_t *mask;
 380 int rt;
 381 {
 382         tprintf("%s", sprintsigmask("", mask, rt));
 383 }
 384
 385 void
 386 printsignal(nr)
 387 int nr;
 388 {
 389         tprintf("%s", signame(nr));
 390 }
 391
 392 void
 393 print_sigset(struct tcb *tcp, long addr, int rt)
 394 {
 395         sigset_t ss;
 396
 397         if (!addr)
 398                 tprintf("NULL");
 399         else if (copy_sigset(tcp, addr, &ss) < 0)
 400                 tprintf("%#lx", addr);
 401         else
 402                 printsigmask(&ss, rt);
 403 }
 404
 405 #ifdef LINUX
 406
 407 #ifndef ILL_ILLOPC
 408 #define ILL_ILLOPC      1       /* illegal opcode */
 409 #define ILL_ILLOPN      2       /* illegal operand */
 410 #define ILL_ILLADR      3       /* illegal addressing mode */
 411 #define ILL_ILLTRP      4       /* illegal trap */
 412 #define ILL_PRVOPC      5       /* privileged opcode */
 413 #define ILL_PRVREG      6       /* privileged register */
 414 #define ILL_COPROC      7       /* coprocessor error */
 415 #define ILL_BADSTK      8       /* internal stack error */
 416 #define FPE_INTDIV      1       /* integer divide by zero */
 417 #define FPE_INTOVF      2       /* integer overflow */
 418 #define FPE_FLTDIV      3       /* floating point divide by zero */
 419 #define FPE_FLTOVF      4       /* floating point overflow */
 420 #define FPE_FLTUND      5       /* floating point underflow */
 421 #define FPE_FLTRES      6       /* floating point inexact result */
 422 #define FPE_FLTINV      7       /* floating point invalid operation */
 423 #define FPE_FLTSUB      8       /* subscript out of range */
 424 #define SEGV_MAPERR     1       /* address not mapped to object */
 425 #define SEGV_ACCERR     2       /* invalid permissions for mapped object */
 426 #define BUS_ADRALN      1       /* invalid address alignment */
 427 #define BUS_ADRERR      2       /* non-existant physical address */
 428 #define BUS_OBJERR      3       /* object specific hardware error */
 429 #define TRAP_BRKPT      1       /* process breakpoint */
 430 #define TRAP_TRACE      2       /* process trace trap */
 431 #define CLD_EXITED      1       /* child has exited */
 432 #define CLD_KILLED      2       /* child was killed */
 433 #define CLD_DUMPED      3       /* child terminated abnormally */
 434 #define CLD_TRAPPED     4       /* traced child has trapped */
 435 #define CLD_STOPPED     5       /* child has stopped */
 436 #define CLD_CONTINUED   6       /* stopped child has continued */
 437 #define POLL_IN         1       /* data input available */
 438 #define POLL_OUT        2       /* output buffers available */
 439 #define POLL_MSG        3       /* input message available */
 440 #define POLL_ERR        4       /* i/o error */
 441 #define POLL_PRI        5       /* high priority input available */
 442 #define POLL_HUP        6       /* device disconnected */
 443 #define SI_USER         0       /* sent by kill, sigsend, raise */
 444 #define SI_QUEUE        -1      /* sent by sigqueue */
 445 #define SI_TIMER        -2      /* sent by timer expiration */
 446 #define SI_MESGQ        -3      /* sent by real time mesq state change */
 447 #define SI_ASYNCIO      -4      /* sent by AIO completion */
 448 #define SI_SIGIO        -5      /* Sent by SIGIO */
 449 #define SI_TKILL        -6      /* Sent by tkill */
 450 #endif
 451
 452 #if __GLIBC_MINOR__ < 1
 453 /* Type for data associated with a signal.  */
 454 typedef union sigval
 455 {
 456         int sival_int;
 457         void *sival_ptr;
 458 } sigval_t;
 459
 460 # define __SI_MAX_SIZE     128
 461 # define __SI_PAD_SIZE     ((__SI_MAX_SIZE / sizeof (int)) - 3)
 462
 463 typedef struct siginfo
 464 {
 465         int si_signo;               /* Signal number.  */
 466         int si_errno;               /* If non-zero, an errno value associated with
 467                                                                    this signal, as defined in <errno.h>.  */
 468         int si_code;                /* Signal code.  */
 469
 470         union
 471         {
 472                 int _pad[__SI_PAD_SIZE];
 473
 474                 /* kill().  */
 475                 struct
 476                 {
 477                         __pid_t si_pid;     /* Sending process ID.  */
 478                         __uid_t si_uid;     /* Real user ID of sending process.  */
 479                 } _kill;
 480
 481                 /* POSIX.1b timers.  */
 482                 struct
 483                 {
 484                         unsigned int _timer1;
 485                         unsigned int _timer2;
 486                 } _timer;
 487
 488                 /* POSIX.1b signals.  */
 489                 struct
 490                 {
 491                         __pid_t si_pid;     /* Sending process ID.  */
 492                         __uid_t si_uid;     /* Real user ID of sending process.  */
 493                         sigval_t si_sigval; /* Signal value.  */
 494                 } _rt;
 495
 496                 /* SIGCHLD.  */
 497                 struct
 498                 {
 499                         __pid_t si_pid;     /* Which child.  */
 500                         int si_status;      /* Exit value or signal.  */
 501                         __clock_t si_utime;
 502                         __clock_t si_stime;
 503                 } _sigchld;
 504
 505                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
 506                 struct
 507                 {
 508                         void *si_addr;      /* Faulting insn/memory ref.  */
 509                 } _sigfault;
 510
 511                 /* SIGPOLL.  */
 512                 struct
 513                 {
 514                         int si_band;        /* Band event for SIGPOLL.  */
 515                         int si_fd;
 516                 } _sigpoll;
 517         } _sifields;
 518 } siginfo_t;
 519
 520 #define si_pid          _sifields._kill.si_pid
 521 #define si_uid          _sifields._kill.si_uid
 522 #define si_status       _sifields._sigchld.si_status
 523 #define si_utime        _sifields._sigchld.si_utime
 524 #define si_stime        _sifields._sigchld.si_stime
 525 #define si_value        _sifields._rt.si_sigval
 526 #define si_int          _sifields._rt.si_sigval.sival_int
 527 #define si_ptr          _sifields._rt.si_sigval.sival_ptr
 528 #define si_addr         _sifields._sigfault.si_addr
 529 #define si_band         _sifields._sigpoll.si_band
 530 #define si_fd           _sifields._sigpoll.si_fd
 531
 532 #endif
 533
 534 #endif
 535
 536 #if defined (SVR4) || defined (LINUX)
 537
 538 static const struct xlat siginfo_codes[] = {
 539 #ifdef SI_NOINFO
 540         { SI_NOINFO,    "SI_NOINFO"     },
 541 #endif
 542 #ifdef SI_USER
 543         { SI_USER,      "SI_USER"       },
 544 #endif
 545 #ifdef SI_LWP
 546         { SI_LWP,       "SI_LWP"        },
 547 #endif
 548 #ifdef SI_QUEUE
 549         { SI_QUEUE,     "SI_QUEUE"      },
 550 #endif
 551 #ifdef SI_TIMER
 552         { SI_TIMER,     "SI_TIMER"      },
 553 #endif
 554 #ifdef SI_ASYNCIO
 555         { SI_ASYNCIO,   "SI_ASYNCIO"    },
 556 #endif
 557 #ifdef SI_MESGQ
 558         { SI_MESGQ,     "SI_MESGQ"      },
 559 #endif
 560 #ifdef SI_SIGIO
 561         { SI_SIGIO,     "SI_SIGIO"      },
 562 #endif
 563 #ifdef SI_TKILL
 564         { SI_TKILL,     "SI_TKILL"      },
 565 #endif
 566         { 0,            NULL            },
 567 };
 568
 569 static const struct xlat sigill_codes[] = {
 570         { ILL_ILLOPC,   "ILL_ILLOPC"    },
 571         { ILL_ILLOPN,   "ILL_ILLOPN"    },
 572         { ILL_ILLADR,   "ILL_ILLADR"    },
 573         { ILL_ILLTRP,   "ILL_ILLTRP"    },
 574         { ILL_PRVOPC,   "ILL_PRVOPC"    },
 575         { ILL_PRVREG,   "ILL_PRVREG"    },
 576         { ILL_COPROC,   "ILL_COPROC"    },
 577         { ILL_BADSTK,   "ILL_BADSTK"    },
 578         { 0,            NULL            },
 579 };
 580
 581 static const struct xlat sigfpe_codes[] = {
 582         { FPE_INTDIV,   "FPE_INTDIV"    },
 583         { FPE_INTOVF,   "FPE_INTOVF"    },
 584         { FPE_FLTDIV,   "FPE_FLTDIV"    },
 585         { FPE_FLTOVF,   "FPE_FLTOVF"    },
 586         { FPE_FLTUND,   "FPE_FLTUND"    },
 587         { FPE_FLTRES,   "FPE_FLTRES"    },
 588         { FPE_FLTINV,   "FPE_FLTINV"    },
 589         { FPE_FLTSUB,   "FPE_FLTSUB"    },
 590         { 0,            NULL            },
 591 };
 592
 593 static const struct xlat sigtrap_codes[] = {
 594         { TRAP_BRKPT,   "TRAP_BRKPT"    },
 595         { TRAP_TRACE,   "TRAP_TRACE"    },
 596         { 0,            NULL            },
 597 };
 598
 599 static const struct xlat sigchld_codes[] = {
 600         { CLD_EXITED,   "CLD_EXITED"    },
 601         { CLD_KILLED,   "CLD_KILLED"    },
 602         { CLD_DUMPED,   "CLD_DUMPED"    },
 603         { CLD_TRAPPED,  "CLD_TRAPPED"   },
 604         { CLD_STOPPED,  "CLD_STOPPED"   },
 605         { CLD_CONTINUED,"CLD_CONTINUED" },
 606         { 0,            NULL            },
 607 };
 608
 609 static const struct xlat sigpoll_codes[] = {
 610         { POLL_IN,      "POLL_IN"       },
 611         { POLL_OUT,     "POLL_OUT"      },
 612         { POLL_MSG,     "POLL_MSG"      },
 613         { POLL_ERR,     "POLL_ERR"      },
 614         { POLL_PRI,     "POLL_PRI"      },
 615         { POLL_HUP,     "POLL_HUP"      },
 616         { 0,            NULL            },
 617 };
 618
 619 static const struct xlat sigprof_codes[] = {
 620 #ifdef PROF_SIG
 621         { PROF_SIG,     "PROF_SIG"      },
 622 #endif
 623         { 0,            NULL            },
 624 };
 625
 626 #ifdef SIGEMT
 627 static const struct xlat sigemt_codes[] = {
 628 #ifdef EMT_TAGOVF
 629         { EMT_TAGOVF,   "EMT_TAGOVF"    },
 630 #endif
 631         { 0,            NULL            },
 632 };
 633 #endif
 634
 635 static const struct xlat sigsegv_codes[] = {
 636         { SEGV_MAPERR,  "SEGV_MAPERR"   },
 637         { SEGV_ACCERR,  "SEGV_ACCERR"   },
 638         { 0,            NULL            },
 639 };
 640
 641 static const struct xlat sigbus_codes[] = {
 642         { BUS_ADRALN,   "BUS_ADRALN"    },
 643         { BUS_ADRERR,   "BUS_ADRERR"    },
 644         { BUS_OBJERR,   "BUS_OBJERR"    },
 645         { 0,            NULL            },
 646 };
 647
 648 void
 649 printsiginfo(sip, verbose)
 650 siginfo_t *sip;
 651 int verbose;
 652 {
 653         const char *code;
 654
 655         if (sip->si_signo == 0) {
 656                 tprintf ("{}");
 657                 return;
 658         }
 659         tprintf("{si_signo=");
 660         printsignal(sip->si_signo);
 661         code = xlookup(siginfo_codes, sip->si_code);
 662         if (!code) {
 663                 switch (sip->si_signo) {
 664                 case SIGTRAP:
 665                         code = xlookup(sigtrap_codes, sip->si_code);
 666                         break;
 667                 case SIGCHLD:
 668                         code = xlookup(sigchld_codes, sip->si_code);
 669                         break;
 670                 case SIGPOLL:
 671                         code = xlookup(sigpoll_codes, sip->si_code);
 672                         break;
 673                 case SIGPROF:
 674                         code = xlookup(sigprof_codes, sip->si_code);
 675                         break;
 676                 case SIGILL:
 677                         code = xlookup(sigill_codes, sip->si_code);
 678                         break;
 679 #ifdef SIGEMT
 680                 case SIGEMT:
 681                         code = xlookup(sigemt_codes, sip->si_code);
 682                         break;
 683 #endif
 684                 case SIGFPE:
 685                         code = xlookup(sigfpe_codes, sip->si_code);
 686                         break;
 687                 case SIGSEGV:
 688                         code = xlookup(sigsegv_codes, sip->si_code);
 689                         break;
 690                 case SIGBUS:
 691                         code = xlookup(sigbus_codes, sip->si_code);
 692                         break;
 693                 }
 694         }
 695         if (code)
 696                 tprintf(", si_code=%s", code);
 697         else
 698                 tprintf(", si_code=%#x", sip->si_code);
 699 #ifdef SI_NOINFO
 700         if (sip->si_code != SI_NOINFO)
 701 #endif
 702         {
 703                 if (sip->si_errno) {
 704                         if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
 705                                 tprintf(", si_errno=%d", sip->si_errno);
 706                         else
 707                                 tprintf(", si_errno=%s",
 708                                         errnoent[sip->si_errno]);
 709                 }
 710 #ifdef SI_FROMUSER
 711                 if (SI_FROMUSER(sip)) {
 712                         tprintf(", si_pid=%ld, si_uid=%ld",
 713                                 sip->si_pid, sip->si_uid);
 714 #ifdef SI_QUEUE
 715                         switch (sip->si_code) {
 716                         case SI_QUEUE:
 717 #ifdef SI_TIMER
 718                         case SI_TIMER:
 719 #endif /* SI_QUEUE */
 720                         case SI_ASYNCIO:
 721 #ifdef SI_MESGQ
 722                         case SI_MESGQ:
 723 #endif /* SI_MESGQ */
 724                                 tprintf(", si_value=%d",
 725                                         sip->si_value.sival_int);
 726                                 break;
 727                         }
 728 #endif /* SI_QUEUE */
 729                 }
 730                 else
 731 #endif /* SI_FROMUSER */
 732                 {
 733                         switch (sip->si_signo) {
 734                         case SIGCHLD:
 735                                 tprintf(", si_pid=%ld, si_status=",
 736                                         (long) sip->si_pid);
 737                                 if (sip->si_code == CLD_EXITED)
 738                                         tprintf("%d", sip->si_status);
 739                                 else
 740                                         printsignal(sip->si_status);
 741 #if LINUX
 742                                 if (!verbose)
 743                                         tprintf(", ...");
 744                                 else
 745                                         tprintf(", si_utime=%lu, si_stime=%lu",
 746                                                 sip->si_utime,
 747                                                 sip->si_stime);
 748 #endif
 749                                 break;
 750                         case SIGILL: case SIGFPE:
 751                         case SIGSEGV: case SIGBUS:
 752                                 tprintf(", si_addr=%#lx",
 753                                         (unsigned long) sip->si_addr);
 754                                 break;
 755                         case SIGPOLL:
 756                                 switch (sip->si_code) {
 757                                 case POLL_IN: case POLL_OUT: case POLL_MSG:
 758                                         tprintf(", si_band=%ld",
 759                                                 (long) sip->si_band);
 760                                         break;
 761                                 }
 762                                 break;
 763 #ifdef LINUX
 764                         default:
 765                                 tprintf(", si_pid=%lu, si_uid=%lu, ",
 766                                         (unsigned long) sip->si_pid,
 767                                         (unsigned long) sip->si_uid);
 768                                 if (!verbose)
 769                                         tprintf("...");
 770                                 else {
 771                                         tprintf("si_value={int=%u, ptr=%#lx}",
 772                                                 sip->si_int,
 773                                                 (unsigned long) sip->si_ptr);
 774                                 }
 775 #endif
 776
 777                         }
 778                 }
 779         }
 780         tprintf("}");
 781 }
 782
 783 #endif /* SVR4 || LINUX */
 784
 785 #ifdef LINUX
 786
 787 static void
 788 parse_sigset_t (const char *str, sigset_t *set)
 789 {
 790         const char *p;
 791         unsigned int digit;
 792         int i;
 793
 794         sigemptyset(set);
 795
 796         p = strchr(str, '\n');
 797         if (p == NULL)
 798                 p = strchr(str, '\0');
 799         for (i = 0; p-- > str; i += 4) {
 800                 if (*p >= '0' && *p <= '9')
 801                         digit = *p - '0';
 802                 else if (*p >= 'a' && *p <= 'f')
 803                         digit = *p - 'a' + 10;
 804                 else if (*p >= 'A' && *p <= 'F')
 805                         digit = *p - 'A' + 10;
 806                 else
 807                         break;
 808                 if (digit & 1)
 809                         sigaddset(set, i + 1);
 810                 if (digit & 2)
 811                         sigaddset(set, i + 2);
 812                 if (digit & 4)
 813                         sigaddset(set, i + 3);
 814                 if (digit & 8)
 815                         sigaddset(set, i + 4);
 816         }
 817 }
 818
 819 #endif
 820
 821 /*
 822  * Check process TCP for the disposition of signal SIG.
 823  * Return 1 if the process would somehow manage to  survive signal SIG,
 824  * else return 0.  This routine will never be called with SIGKILL.
 825  */
 826 int
 827 sigishandled(tcp, sig)
 828 struct tcb *tcp;
 829 int sig;
 830 {
 831 #ifdef LINUX
 832         int sfd;
 833         char sname[32];
 834         char buf[2048];
 835         char *s;
 836         int i;
 837         sigset_t ignored, caught;
 838 #endif
 839 #ifdef SVR4
 840         /*
 841          * Since procfs doesn't interfere with wait I think it is safe
 842          * to punt on this question.  If not, the information is there.
 843          */
 844         return 1;
 845 #else /* !SVR4 */
 846         switch (sig) {
 847         case SIGCONT:
 848         case SIGSTOP:
 849         case SIGTSTP:
 850         case SIGTTIN:
 851         case SIGTTOU:
 852         case SIGCHLD:
 853         case SIGIO:
 854 #if defined(SIGURG) && SIGURG != SIGIO
 855         case SIGURG:
 856 #endif
 857         case SIGWINCH:
 858                 /* Gloria Gaynor says ... */
 859                 return 1;
 860         default:
 861                 break;
 862         }
 863 #endif /* !SVR4 */
 864 #ifdef LINUX
 865
 866         /* This is incredibly costly but it's worth it. */
 867         /* NOTE: LinuxThreads internally uses SIGRTMIN, SIGRTMIN + 1 and
 868            SIGRTMIN + 2, so we can't use the obsolete /proc/%d/stat which
 869            doesn't handle real-time signals). */
 870         sprintf(sname, "/proc/%d/status", tcp->pid);
 871         if ((sfd = open(sname, O_RDONLY)) == -1) {
 872                 perror(sname);
 873                 return 1;
 874         }
 875         i = read(sfd, buf, sizeof(buf));
 876         buf[i] = '\0';
 877         close(sfd);
 878         /*
 879          * Skip the extraneous fields. We need to skip
 880          * command name has any spaces in it.  So be it.
 881          */
 882         s = strstr(buf, "SigIgn:\t");
 883         if (!s)
 884         {
 885                 fprintf(stderr, "/proc/pid/status format error\n");
 886                 return 1;
 887         }
 888         parse_sigset_t(s + 8, &ignored);
 889
 890         s = strstr(buf, "SigCgt:\t");
 891         if (!s)
 892         {
 893                 fprintf(stderr, "/proc/pid/status format error\n");
 894                 return 1;
 895         }
 896         parse_sigset_t(s + 8, &caught);
 897
 898 #ifdef DEBUG
 899         fprintf(stderr, "sigs: %016qx %016qx (sig=%d)\n",
 900                 *(long long *) &ignored, *(long long *) &caught, sig);
 901 #endif
 902         if (sigismember(&ignored, sig) || sigismember(&caught, sig))
 903                 return 1;
 904 #endif /* LINUX */
 905
 906 #ifdef SUNOS4
 907         void (*u_signal)();
 908
 909         if (upeek(tcp, uoff(u_signal[0]) + sig*sizeof(u_signal),
 910             (long *) &u_signal) < 0) {
 911                 return 0;
 912         }
 913         if (u_signal != SIG_DFL)
 914                 return 1;
 915 #endif /* SUNOS4 */
 916
 917         return 0;
 918 }
 919
 920 #if defined(SUNOS4) || defined(FREEBSD)
 921
 922 int
 923 sys_sigvec(tcp)
 924 struct tcb *tcp;
 925 {
 926         struct sigvec sv;
 927         long addr;
 928
 929         if (entering(tcp)) {
 930                 printsignal(tcp->u_arg[0]);
 931                 tprintf(", ");
 932                 addr = tcp->u_arg[1];
 933         } else {
 934                 addr = tcp->u_arg[2];
 935         }
 936         if (addr == 0)
 937                 tprintf("NULL");
 938         else if (!verbose(tcp))
 939                 tprintf("%#lx", addr);
 940         else if (umove(tcp, addr, &sv) < 0)
 941                 tprintf("{...}");
 942         else {
 943                 switch ((int) sv.sv_handler) {
 944                 case (int) SIG_ERR:
 945                         tprintf("{SIG_ERR}");
 946                         break;
 947                 case (int) SIG_DFL:
 948                         tprintf("{SIG_DFL}");
 949                         break;
 950                 case (int) SIG_IGN:
 951                         if (tcp->u_arg[0] == SIGTRAP) {
 952                                 tcp->flags |= TCB_SIGTRAPPED;
 953                                 kill(tcp->pid, SIGSTOP);
 954                         }
 955                         tprintf("{SIG_IGN}");
 956                         break;
 957                 case (int) SIG_HOLD:
 958                         if (tcp->u_arg[0] == SIGTRAP) {
 959                                 tcp->flags |= TCB_SIGTRAPPED;
 960                                 kill(tcp->pid, SIGSTOP);
 961                         }
 962                         tprintf("SIG_HOLD");
 963                         break;
 964                 default:
 965                         if (tcp->u_arg[0] == SIGTRAP) {
 966                                 tcp->flags |= TCB_SIGTRAPPED;
 967                                 kill(tcp->pid, SIGSTOP);
 968                         }
 969                         tprintf("{%#lx, ", (unsigned long) sv.sv_handler);
 970                         printsigmask(&sv.sv_mask, 0);
 971                         tprintf(", ");
 972                         printflags(sigvec_flags, sv.sv_flags, "SV_???");
 973                         tprintf("}");
 974                 }
 975         }
 976         if (entering(tcp))
 977                 tprintf(", ");
 978         return 0;
 979 }
 980
 981 int
 982 sys_sigpause(tcp)
 983 struct tcb *tcp;
 984 {
 985         if (entering(tcp)) {    /* WTA: UD had a bug here: he forgot the braces */
 986                 sigset_t sigm;
 987                 long_to_sigset(tcp->u_arg[0], &sigm);
 988                 printsigmask(&sigm, 0);
 989         }
 990         return 0;
 991 }
 992
 993 int
 994 sys_sigstack(tcp)
 995 struct tcb *tcp;
 996 {
 997         struct sigstack ss;
 998         long addr;
 999
1000         if (entering(tcp))
1001                 addr = tcp->u_arg[0];
1002         else
1003                 addr = tcp->u_arg[1];
1004         if (addr == 0)
1005                 tprintf("NULL");
1006         else if (umove(tcp, addr, &ss) < 0)
1007                 tprintf("%#lx", addr);
1008         else {
1009                 tprintf("{ss_sp %#lx ", (unsigned long) ss.ss_sp);
1010                 tprintf("ss_onstack %s}", ss.ss_onstack ? "YES" : "NO");
1011         }
1012         if (entering(tcp))
1013                 tprintf(", ");
1014         return 0;
1015 }
1016
1017 int
1018 sys_sigcleanup(tcp)
1019 struct tcb *tcp;
1020 {
1021         return 0;
1022 }
1023
1024 #endif /* SUNOS4 || FREEBSD */
1025
1026 #ifndef SVR4
1027
1028 int
1029 sys_sigsetmask(tcp)
1030 struct tcb *tcp;
1031 {
1032         if (entering(tcp)) {
1033                 sigset_t sigm;
1034                 long_to_sigset(tcp->u_arg[0], &sigm);
1035                 printsigmask(&sigm, 0);
1036 #ifndef USE_PROCFS
1037                 if ((tcp->u_arg[0] & sigmask(SIGTRAP))) {
1038                         /* Mark attempt to block SIGTRAP */
1039                         tcp->flags |= TCB_SIGTRAPPED;
1040                         /* Send unblockable signal */
1041                         kill(tcp->pid, SIGSTOP);
1042                 }
1043 #endif /* !USE_PROCFS */
1044         }
1045         else if (!syserror(tcp)) {
1046                 sigset_t sigm;
1047                 long_to_sigset(tcp->u_rval, &sigm);
1048                 tcp->auxstr = sprintsigmask("old mask ", &sigm, 0);
1049
1050                 return RVAL_HEX | RVAL_STR;
1051         }
1052         return 0;
1053 }
1054
1055 #if defined(SUNOS4) || defined(FREEBSD)
1056 int
1057 sys_sigblock(tcp)
1058 struct tcb *tcp;
1059 {
1060         return sys_sigsetmask(tcp);
1061 }
1062 #endif /* SUNOS4 || FREEBSD */
1063
1064 #endif /* !SVR4 */
1065
1066 #ifdef HAVE_SIGACTION
1067
1068 #ifdef LINUX
1069 struct old_sigaction {
1070         __sighandler_t __sa_handler;
1071         unsigned long sa_mask;
1072         unsigned long sa_flags;
1073         void (*sa_restorer)(void);
1074 };
1075 #define SA_HANDLER __sa_handler
1076 #endif /* LINUX */
1077
1078 #ifndef SA_HANDLER
1079 #define SA_HANDLER sa_handler
1080 #endif
1081
1082 int
1083 sys_sigaction(tcp)
1084 struct tcb *tcp;
1085 {
1086         long addr;
1087 #ifdef LINUX
1088         sigset_t sigset;
1089         struct old_sigaction sa;
1090 #else
1091         struct sigaction sa;
1092 #endif
1093
1094
1095         if (entering(tcp)) {
1096                 printsignal(tcp->u_arg[0]);
1097                 tprintf(", ");
1098                 addr = tcp->u_arg[1];
1099         } else
1100                 addr = tcp->u_arg[2];
1101         if (addr == 0)
1102                 tprintf("NULL");
1103         else if (!verbose(tcp))
1104                 tprintf("%#lx", addr);
1105         else if (umove(tcp, addr, &sa) < 0)
1106                 tprintf("{...}");
1107         else {
1108                 /* Architectures using function pointers, like
1109                  * hppa, may need to manipulate the function pointer
1110                  * to compute the result of a comparison. However,
1111                  * the SA_HANDLER function pointer exists only in
1112                  * the address space of the traced process, and can't
1113                  * be manipulated by strace. In order to prevent the
1114                  * compiler from generating code to manipulate
1115                  * SA_HANDLER we cast the function pointers to long. */
1116                 if ((long)sa.SA_HANDLER == (long)SIG_ERR)
1117                         tprintf("{SIG_ERR, ");
1118                 else if ((long)sa.SA_HANDLER == (long)SIG_DFL)
1119                         tprintf("{SIG_DFL, ");
1120                 else if ((long)sa.SA_HANDLER == (long)SIG_IGN) {
1121 #ifndef USE_PROCFS
1122                         if (tcp->u_arg[0] == SIGTRAP) {
1123                                 tcp->flags |= TCB_SIGTRAPPED;
1124                                 kill(tcp->pid, SIGSTOP);
1125                         }
1126 #endif /* !USE_PROCFS */
1127                         tprintf("{SIG_IGN, ");
1128                 }
1129                 else {
1130 #ifndef USE_PROCFS
1131                         if (tcp->u_arg[0] == SIGTRAP) {
1132                                 tcp->flags |= TCB_SIGTRAPPED;
1133                                 kill(tcp->pid, SIGSTOP);
1134                         }
1135 #endif /* !USE_PROCFS */
1136                         tprintf("{%#lx, ", (long) sa.SA_HANDLER);
1137 #ifndef LINUX
1138                         printsigmask (&sa.sa_mask, 0);
1139 #else
1140                         long_to_sigset(sa.sa_mask, &sigset);
1141                         printsigmask(&sigset, 0);
1142 #endif
1143                         tprintf(", ");
1144                         printflags(sigact_flags, sa.sa_flags, "SA_???");
1145 #ifdef SA_RESTORER
1146                         if (sa.sa_flags & SA_RESTORER)
1147                                 tprintf(", %p", sa.sa_restorer);
1148 #endif
1149                         tprintf("}");
1150                 }
1151         }
1152         if (entering(tcp))
1153                 tprintf(", ");
1154 #ifdef LINUX
1155         else
1156                 tprintf(", %#lx", (unsigned long) sa.sa_restorer);
1157 #endif
1158         return 0;
1159 }
1160
1161 int
1162 sys_signal(tcp)
1163 struct tcb *tcp;
1164 {
1165         if (entering(tcp)) {
1166                 printsignal(tcp->u_arg[0]);
1167                 tprintf(", ");
1168                 switch (tcp->u_arg[1]) {
1169                 case (long) SIG_ERR:
1170                         tprintf("SIG_ERR");
1171                         break;
1172                 case (long) SIG_DFL:
1173                         tprintf("SIG_DFL");
1174                         break;
1175                 case (long) SIG_IGN:
1176 #ifndef USE_PROCFS
1177                         if (tcp->u_arg[0] == SIGTRAP) {
1178                                 tcp->flags |= TCB_SIGTRAPPED;
1179                                 kill(tcp->pid, SIGSTOP);
1180                         }
1181 #endif /* !USE_PROCFS */
1182                         tprintf("SIG_IGN");
1183                         break;
1184                 default:
1185 #ifndef USE_PROCFS
1186                         if (tcp->u_arg[0] == SIGTRAP) {
1187                                 tcp->flags |= TCB_SIGTRAPPED;
1188                                 kill(tcp->pid, SIGSTOP);
1189                         }
1190 #endif /* !USE_PROCFS */
1191                         tprintf("%#lx", tcp->u_arg[1]);
1192                 }
1193                 return 0;
1194         }
1195         else if (!syserror(tcp)) {
1196                 switch (tcp->u_rval) {
1197                     case (long) SIG_ERR:
1198                         tcp->auxstr = "SIG_ERR"; break;
1199                     case (long) SIG_DFL:
1200                         tcp->auxstr = "SIG_DFL"; break;
1201                     case (long) SIG_IGN:
1202                         tcp->auxstr = "SIG_IGN"; break;
1203                     default:
1204                         tcp->auxstr = NULL;
1205                 }
1206                 return RVAL_HEX | RVAL_STR;
1207         }
1208         return 0;
1209 }
1210
1211 #ifdef SVR4
1212 int
1213 sys_sighold(tcp)
1214 struct tcb *tcp;
1215 {
1216         if (entering(tcp)) {
1217                 printsignal(tcp->u_arg[0]);
1218         }
1219         return 0;
1220 }
1221 #endif /* SVR4 */
1222
1223 #endif /* HAVE_SIGACTION */
1224
1225 #ifdef LINUX
1226
1227 int
1228 sys_sigreturn(struct tcb *tcp)
1229 {
1230 #if defined(ARM)
1231         struct pt_regs regs;
1232         struct sigcontext_struct sc;
1233
1234         if (entering(tcp)) {
1235                 tcp->u_arg[0] = 0;
1236
1237                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)&regs) == -1)
1238                         return 0;
1239
1240                 if (umove(tcp, regs.ARM_sp, &sc) < 0)
1241                         return 0;
1242
1243                 tcp->u_arg[0] = 1;
1244                 tcp->u_arg[1] = sc.oldmask;
1245         } else {
1246                 sigset_t sigm;
1247                 long_to_sigset(tcp->u_arg[1], &sigm);
1248                 tcp->u_rval = tcp->u_error = 0;
1249                 if (tcp->u_arg[0] == 0)
1250                         return 0;
1251                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1252                 return RVAL_NONE | RVAL_STR;
1253         }
1254         return 0;
1255 #elif defined(S390) || defined(S390X)
1256         long usp;
1257         struct sigcontext_struct sc;
1258
1259         if (entering(tcp)) {
1260                 tcp->u_arg[0] = 0;
1261                 if (upeek(tcp,PT_GPR15,&usp)<0)
1262                         return 0;
1263                 if (umove(tcp, usp+__SIGNAL_FRAMESIZE, &sc) < 0)
1264                         return 0;
1265                 tcp->u_arg[0] = 1;
1266                 memcpy(&tcp->u_arg[1],&sc.oldmask[0],sizeof(sigset_t));
1267         } else {
1268                 tcp->u_rval = tcp->u_error = 0;
1269                 if (tcp->u_arg[0] == 0)
1270                         return 0;
1271                 tcp->auxstr = sprintsigmask("mask now ",(sigset_t *)&tcp->u_arg[1],0);
1272                 return RVAL_NONE | RVAL_STR;
1273         }
1274         return 0;
1275 #elif defined(I386)
1276         long esp;
1277         struct sigcontext_struct sc;
1278
1279         if (entering(tcp)) {
1280                 tcp->u_arg[0] = 0;
1281                 if (upeek(tcp, 4*UESP, &esp) < 0)
1282                         return 0;
1283                 if (umove(tcp, esp, &sc) < 0)
1284                         return 0;
1285                 tcp->u_arg[0] = 1;
1286                 tcp->u_arg[1] = sc.oldmask;
1287         }
1288         else {
1289                 sigset_t sigm;
1290                 long_to_sigset(tcp->u_arg[1], &sigm);
1291                 tcp->u_rval = tcp->u_error = 0;
1292                 if (tcp->u_arg[0] == 0)
1293                         return 0;
1294                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1295                 return RVAL_NONE | RVAL_STR;
1296         }
1297         return 0;
1298 #elif defined(IA64)
1299         struct sigcontext sc;
1300         long sp;
1301
1302         if (entering(tcp)) {
1303                 /* offset of sigcontext in the kernel's sigframe structure: */
1304 #               define SIGFRAME_SC_OFFSET       0x90
1305                 tcp->u_arg[0] = 0;
1306                 if (upeek(tcp, PT_R12, &sp) < 0)
1307                         return 0;
1308                 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
1309                         return 0;
1310                 tcp->u_arg[0] = 1;
1311                 memcpy(tcp->u_arg + 1, &sc.sc_mask, sizeof(sc.sc_mask));
1312         }
1313         else {
1314                 sigset_t sigm;
1315
1316                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1317                 tcp->u_rval = tcp->u_error = 0;
1318                 if (tcp->u_arg[0] == 0)
1319                         return 0;
1320                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1321                 return RVAL_NONE | RVAL_STR;
1322         }
1323         return 0;
1324 #elif defined(POWERPC)
1325         long esp;
1326         struct sigcontext_struct sc;
1327
1328         if (entering(tcp)) {
1329                 tcp->u_arg[0] = 0;
1330                 if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
1331                         return 0;
1332                 /* Skip dummy stack frame. */
1333 #ifdef POWERPC64
1334                 if (current_personality == 0)
1335                         esp += 128;
1336                 else
1337                         esp += 64;
1338 #else
1339                 esp += 64;
1340 #endif
1341                 if (umove(tcp, esp, &sc) < 0)
1342                         return 0;
1343                 tcp->u_arg[0] = 1;
1344                 tcp->u_arg[1] = sc.oldmask;
1345         }
1346         else {
1347                 sigset_t sigm;
1348                 long_to_sigset(tcp->u_arg[1], &sigm);
1349                 tcp->u_rval = tcp->u_error = 0;
1350                 if (tcp->u_arg[0] == 0)
1351                         return 0;
1352                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1353                 return RVAL_NONE | RVAL_STR;
1354         }
1355         return 0;
1356 #elif defined(M68K)
1357         long usp;
1358         struct sigcontext sc;
1359
1360         if (entering(tcp)) {
1361                 tcp->u_arg[0] = 0;
1362                 if (upeek(tcp, 4*PT_USP, &usp) < 0)
1363                         return 0;
1364                 if (umove(tcp, usp, &sc) < 0)
1365                         return 0;
1366                 tcp->u_arg[0] = 1;
1367                 tcp->u_arg[1] = sc.sc_mask;
1368         }
1369         else {
1370                 sigset_t sigm;
1371                 long_to_sigset(tcp->u_arg[1], &sigm);
1372                 tcp->u_rval = tcp->u_error = 0;
1373                 if (tcp->u_arg[0] == 0)
1374                         return 0;
1375                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1376                 return RVAL_NONE | RVAL_STR;
1377         }
1378         return 0;
1379 #elif defined(ALPHA)
1380         long fp;
1381         struct sigcontext_struct sc;
1382
1383         if (entering(tcp)) {
1384                 tcp->u_arg[0] = 0;
1385                 if (upeek(tcp, REG_FP, &fp) < 0)
1386                         return 0;
1387                 if (umove(tcp, fp, &sc) < 0)
1388                         return 0;
1389                 tcp->u_arg[0] = 1;
1390                 tcp->u_arg[1] = sc.sc_mask;
1391         }
1392         else {
1393                 sigset_t sigm;
1394                 long_to_sigset(tcp->u_arg[1], &sigm);
1395                 tcp->u_rval = tcp->u_error = 0;
1396                 if (tcp->u_arg[0] == 0)
1397                         return 0;
1398                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1399                 return RVAL_NONE | RVAL_STR;
1400         }
1401         return 0;
1402 #elif defined (SPARC) || defined (SPARC64)
1403         long i1;
1404         struct pt_regs regs;
1405         m_siginfo_t si;
1406
1407         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1408                 perror("sigreturn: PTRACE_GETREGS ");
1409                 return 0;
1410         }
1411         if(entering(tcp)) {
1412                 tcp->u_arg[0] = 0;
1413                 i1 = regs.u_regs[U_REG_O1];
1414                 if(umove(tcp, i1, &si) < 0) {
1415                         perror("sigreturn: umove ");
1416                         return 0;
1417                 }
1418                 tcp->u_arg[0] = 1;
1419                 tcp->u_arg[1] = si.si_mask;
1420         } else {
1421                 sigset_t sigm;
1422                 long_to_sigset(tcp->u_arg[1], &sigm);
1423                 tcp->u_rval = tcp->u_error = 0;
1424                 if(tcp->u_arg[0] == 0)
1425                         return 0;
1426                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1427                 return RVAL_NONE | RVAL_STR;
1428         }
1429         return 0;
1430 #elif defined (LINUX_MIPSN32) || defined (LINUX_MIPSN64)
1431         /* This decodes rt_sigreturn.  The 64-bit ABIs do not have
1432            sigreturn.  */
1433         long sp;
1434         struct ucontext uc;
1435
1436         if(entering(tcp)) {
1437                 tcp->u_arg[0] = 0;
1438                 if (upeek(tcp, REG_SP, &sp) < 0)
1439                         return 0;
1440                 /* There are six words followed by a 128-byte siginfo.  */
1441                 sp = sp + 6 * 4 + 128;
1442                 if (umove(tcp, sp, &uc) < 0)
1443                         return 0;
1444                 tcp->u_arg[0] = 1;
1445                 tcp->u_arg[1] = *(long *) &uc.uc_sigmask;
1446         } else {
1447                 sigset_t sigm;
1448                 long_to_sigset(tcp->u_arg[1], &sigm);
1449                 tcp->u_rval = tcp->u_error = 0;
1450                 if(tcp->u_arg[0] == 0)
1451                         return 0;
1452                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1453                 return RVAL_NONE | RVAL_STR;
1454         }
1455         return 0;
1456 #elif defined(MIPS)
1457         long sp;
1458         struct pt_regs regs;
1459         m_siginfo_t si;
1460
1461         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1462                 perror("sigreturn: PTRACE_GETREGS ");
1463                 return 0;
1464         }
1465         if(entering(tcp)) {
1466                 tcp->u_arg[0] = 0;
1467                 sp = regs.regs[29];
1468                 if (umove(tcp, sp, &si) < 0)
1469                 tcp->u_arg[0] = 1;
1470                 tcp->u_arg[1] = si.si_mask;
1471         } else {
1472                 sigset_t sigm;
1473                 long_to_sigset(tcp->u_arg[1], &sigm);
1474                 tcp->u_rval = tcp->u_error = 0;
1475                 if(tcp->u_arg[0] == 0)
1476                         return 0;
1477                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1478                 return RVAL_NONE | RVAL_STR;
1479         }
1480         return 0;
1481 #elif defined(CRISV10) || defined(CRISV32)
1482         struct sigcontext sc;
1483
1484         if (entering(tcp)) {
1485                 long regs[PT_MAX+1];
1486
1487                 tcp->u_arg[0] = 0;
1488
1489                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
1490                         perror("sigreturn: PTRACE_GETREGS");
1491                         return 0;
1492                 }
1493                 if (umove(tcp, regs[PT_USP], &sc) < 0)
1494                         return 0;
1495                 tcp->u_arg[0] = 1;
1496                 tcp->u_arg[1] = sc.oldmask;
1497         } else {
1498                 sigset_t sigm;
1499                 long_to_sigset(tcp->u_arg[1], &sigm);
1500                 tcp->u_rval = tcp->u_error = 0;
1501
1502                 if (tcp->u_arg[0] == 0)
1503                         return 0;
1504                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1505                 return RVAL_NONE | RVAL_STR;
1506         }
1507         return 0;
1508 #elif defined(TILE)
1509         struct ucontext uc;
1510         long sp;
1511
1512         /* offset of ucontext in the kernel's sigframe structure */
1513 #       define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(struct siginfo)
1514
1515         if (entering(tcp)) {
1516                 tcp->u_arg[0] = 0;
1517                 if (upeek(tcp, PTREGS_OFFSET_SP, &sp) < 0)
1518                         return 0;
1519                 if (umove(tcp, sp + SIGFRAME_UC_OFFSET, &uc) < 0)
1520                         return 0;
1521                 tcp->u_arg[0] = 1;
1522                 memcpy(tcp->u_arg + 1, &uc.uc_sigmask, sizeof(uc.uc_sigmask));
1523         }
1524         else {
1525                 sigset_t sigm;
1526
1527                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1528                 tcp->u_rval = tcp->u_error = 0;
1529                 if (tcp->u_arg[0] == 0)
1530                         return 0;
1531                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1532                 return RVAL_NONE | RVAL_STR;
1533         }
1534         return 0;
1535 #elif defined(MICROBLAZE)
1536         struct sigcontext sc;
1537
1538         /* TODO: Verify that this is correct...  */
1539         if (entering(tcp)) {
1540                 long sp;
1541
1542                 tcp->u_arg[0] = 0;
1543
1544                 /* Read r1, the stack pointer.  */
1545                 if (upeek(tcp, 1 * 4, &sp) < 0)
1546                         return 0;
1547                 if (umove(tcp, sp, &sc) < 0)
1548                         return 0;
1549                 tcp->u_arg[0] = 1;
1550                 tcp->u_arg[1] = sc.oldmask;
1551         } else {
1552                 sigset_t sigm;
1553                 long_to_sigset(tcp->u_arg[1], &sigm);
1554                 tcp->u_rval = tcp->u_error = 0;
1555                 if (tcp->u_arg[0] == 0)
1556                         return 0;
1557                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1558                 return RVAL_NONE | RVAL_STR;
1559         }
1560         return 0;
1561 #else
1562 #warning No sys_sigreturn() for this architecture
1563 #warning         (no problem, just a reminder :-)
1564         return 0;
1565 #endif
1566 }
1567
1568 int
1569 sys_siggetmask(tcp)
1570 struct tcb *tcp;
1571 {
1572         if (exiting(tcp)) {
1573                 sigset_t sigm;
1574                 long_to_sigset(tcp->u_rval, &sigm);
1575                 tcp->auxstr = sprintsigmask("mask ", &sigm, 0);
1576         }
1577         return RVAL_HEX | RVAL_STR;
1578 }
1579
1580 int
1581 sys_sigsuspend(struct tcb *tcp)
1582 {
1583         if (entering(tcp)) {
1584                 sigset_t sigm;
1585                 long_to_sigset(tcp->u_arg[2], &sigm);
1586                 printsigmask(&sigm, 0);
1587         }
1588         return 0;
1589 }
1590
1591 #endif /* LINUX */
1592
1593 #if defined(SVR4) || defined(FREEBSD)
1594
1595 int
1596 sys_sigsuspend(tcp)
1597 struct tcb *tcp;
1598 {
1599         sigset_t sigset;
1600
1601         if (entering(tcp)) {
1602                 if (umove(tcp, tcp->u_arg[0], &sigset) < 0)
1603                         tprintf("[?]");
1604                 else
1605                         printsigmask(&sigset, 0);
1606         }
1607         return 0;
1608 }
1609 #ifndef FREEBSD
1610 static const struct xlat ucontext_flags[] = {
1611         { UC_SIGMASK,   "UC_SIGMASK"    },
1612         { UC_STACK,     "UC_STACK"      },
1613         { UC_CPU,       "UC_CPU"        },
1614 #ifdef UC_FPU
1615         { UC_FPU,       "UC_FPU"        },
1616 #endif
1617 #ifdef UC_INTR
1618         { UC_INTR,      "UC_INTR"       },
1619 #endif
1620         { 0,            NULL            },
1621 };
1622 #endif /* !FREEBSD */
1623 #endif /* SVR4 || FREEBSD */
1624
1625 #if defined SVR4 || defined LINUX || defined FREEBSD
1626 #if defined LINUX && !defined SS_ONSTACK
1627 #define SS_ONSTACK      1
1628 #define SS_DISABLE      2
1629 #if __GLIBC_MINOR__ == 0
1630 typedef struct
1631 {
1632         __ptr_t ss_sp;
1633         int ss_flags;
1634         size_t ss_size;
1635 } stack_t;
1636 #endif
1637 #endif
1638 #ifdef FREEBSD
1639 #define stack_t struct sigaltstack
1640 #endif
1641
1642 static const struct xlat sigaltstack_flags[] = {
1643         { SS_ONSTACK,   "SS_ONSTACK"    },
1644         { SS_DISABLE,   "SS_DISABLE"    },
1645         { 0,            NULL            },
1646 };
1647 #endif
1648
1649 #ifdef SVR4
1650 static void
1651 printcontext(tcp, ucp)
1652 struct tcb *tcp;
1653 ucontext_t *ucp;
1654 {
1655         tprintf("{");
1656         if (!abbrev(tcp)) {
1657                 tprintf("uc_flags=");
1658                 printflags(ucontext_flags, ucp->uc_flags, "UC_???");
1659                 tprintf(", uc_link=%#lx, ", (unsigned long) ucp->uc_link);
1660         }
1661         tprintf("uc_sigmask=");
1662         printsigmask(&ucp->uc_sigmask, 0);
1663         if (!abbrev(tcp)) {
1664                 tprintf(", uc_stack={ss_sp=%#lx, ss_size=%d, ss_flags=",
1665                         (unsigned long) ucp->uc_stack.ss_sp,
1666                         ucp->uc_stack.ss_size);
1667                 printflags(sigaltstack_flags, ucp->uc_stack.ss_flags, "SS_???");
1668                 tprintf("}");
1669         }
1670         tprintf(", ...}");
1671 }
1672
1673 int
1674 sys_getcontext(tcp)
1675 struct tcb *tcp;
1676 {
1677         ucontext_t uc;
1678
1679         if (exiting(tcp)) {
1680                 if (tcp->u_error)
1681                         tprintf("%#lx", tcp->u_arg[0]);
1682                 else if (!tcp->u_arg[0])
1683                         tprintf("NULL");
1684                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1685                         tprintf("{...}");
1686                 else
1687                         printcontext(tcp, &uc);
1688         }
1689         return 0;
1690 }
1691
1692 int
1693 sys_setcontext(tcp)
1694 struct tcb *tcp;
1695 {
1696         ucontext_t uc;
1697
1698         if (entering(tcp)) {
1699                 if (!tcp->u_arg[0])
1700                         tprintf("NULL");
1701                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1702                         tprintf("{...}");
1703                 else
1704                         printcontext(tcp, &uc);
1705         }
1706         else {
1707                 tcp->u_rval = tcp->u_error = 0;
1708                 if (tcp->u_arg[0] == 0)
1709                         return 0;
1710                 return RVAL_NONE;
1711         }
1712         return 0;
1713 }
1714
1715 #endif /* SVR4 */
1716
1717 #if defined(LINUX) || defined(FREEBSD)
1718
1719 static int
1720 print_stack_t(tcp, addr)
1721 struct tcb *tcp;
1722 unsigned long addr;
1723 {
1724         stack_t ss;
1725         if (umove(tcp, addr, &ss) < 0)
1726                 return -1;
1727         tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1728         printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1729         tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1730         return 0;
1731 }
1732
1733 int
1734 sys_sigaltstack(tcp)
1735         struct tcb *tcp;
1736 {
1737         if (entering(tcp)) {
1738                 if (tcp->u_arg[0] == 0)
1739                         tprintf("NULL");
1740                 else if (print_stack_t(tcp, tcp->u_arg[0]) < 0)
1741                         return -1;
1742         }
1743         else {
1744                 tprintf(", ");
1745                 if (tcp->u_arg[1] == 0)
1746                         tprintf("NULL");
1747                 else if (print_stack_t(tcp, tcp->u_arg[1]) < 0)
1748                         return -1;
1749         }
1750         return 0;
1751 }
1752 #endif
1753
1754 #ifdef HAVE_SIGACTION
1755
1756 int
1757 sys_sigprocmask(tcp)
1758 struct tcb *tcp;
1759 {
1760 #ifdef ALPHA
1761         if (entering(tcp)) {
1762                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1763                 tprintf(", ");
1764                 printsigmask(tcp->u_arg[1], 0);
1765         }
1766         else if (!syserror(tcp)) {
1767                 tcp->auxstr = sprintsigmask("old mask ", tcp->u_rval, 0);
1768                 return RVAL_HEX | RVAL_STR;
1769         }
1770 #else /* !ALPHA */
1771         if (entering(tcp)) {
1772 #ifdef SVR4
1773                 if (tcp->u_arg[0] == 0)
1774                         tprintf("0");
1775                 else
1776 #endif /* SVR4 */
1777                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1778                 tprintf(", ");
1779                 print_sigset(tcp, tcp->u_arg[1], 0);
1780                 tprintf(", ");
1781         }
1782         else {
1783                 if (!tcp->u_arg[2])
1784                         tprintf("NULL");
1785                 else if (syserror(tcp))
1786                         tprintf("%#lx", tcp->u_arg[2]);
1787                 else
1788                         print_sigset(tcp, tcp->u_arg[2], 0);
1789         }
1790 #endif /* !ALPHA */
1791         return 0;
1792 }
1793
1794 #endif /* HAVE_SIGACTION */
1795
1796 int
1797 sys_kill(tcp)
1798 struct tcb *tcp;
1799 {
1800         if (entering(tcp)) {
1801                 /*
1802                  * Sign-extend a 32-bit value when that's what it is.
1803                  */
1804                 long pid = tcp->u_arg[0];
1805                 if (personality_wordsize[current_personality] < sizeof pid)
1806                         pid = (long) (int) pid;
1807                 tprintf("%ld, %s", pid, signame(tcp->u_arg[1]));
1808         }
1809         return 0;
1810 }
1811
1812 #if defined(FREEBSD) || defined(SUNOS4)
1813 int
1814 sys_killpg(tcp)
1815 struct tcb *tcp;
1816 {
1817         return sys_kill(tcp);
1818 }
1819 #endif /* FREEBSD || SUNOS4 */
1820
1821 #ifdef LINUX
1822 int
1823 sys_tgkill(tcp)
1824         struct tcb *tcp;
1825 {
1826         if (entering(tcp)) {
1827                 tprintf("%ld, %ld, %s",
1828                         tcp->u_arg[0], tcp->u_arg[1], signame(tcp->u_arg[2]));
1829         }
1830         return 0;
1831 }
1832 #endif
1833
1834 int
1835 sys_sigpending(tcp)
1836 struct tcb *tcp;
1837 {
1838         sigset_t sigset;
1839
1840         if (exiting(tcp)) {
1841                 if (syserror(tcp))
1842                         tprintf("%#lx", tcp->u_arg[0]);
1843                 else if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1844                         tprintf("[?]");
1845                 else
1846                         printsigmask(&sigset, 0);
1847         }
1848         return 0;
1849 }
1850
1851 #ifdef SVR4
1852 int sys_sigwait(tcp)
1853 struct tcb *tcp;
1854 {
1855         sigset_t sigset;
1856
1857         if (entering(tcp)) {
1858                 if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1859                         tprintf("[?]");
1860                 else
1861                         printsigmask(&sigset, 0);
1862         }
1863         else {
1864                 if (!syserror(tcp)) {
1865                         tcp->auxstr = signalent[tcp->u_rval];
1866                         return RVAL_DECIMAL | RVAL_STR;
1867                 }
1868         }
1869         return 0;
1870 }
1871 #endif /* SVR4 */
1872
1873 #ifdef LINUX
1874
1875         int
1876 sys_rt_sigprocmask(tcp)
1877         struct tcb *tcp;
1878 {
1879         sigset_t sigset;
1880
1881         /* Note: arg[3] is the length of the sigset. */
1882         if (entering(tcp)) {
1883                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1884                 tprintf(", ");
1885                 if (!tcp->u_arg[1])
1886                         tprintf("NULL, ");
1887                 else if (copy_sigset_len(tcp, tcp->u_arg[1], &sigset, tcp->u_arg[3]) < 0)
1888                         tprintf("%#lx, ", tcp->u_arg[1]);
1889                 else {
1890                         printsigmask(&sigset, 1);
1891                         tprintf(", ");
1892                 }
1893         }
1894         else {
1895                 if (!tcp->u_arg[2])
1896
1897                         tprintf("NULL");
1898                 else if (syserror(tcp))
1899                         tprintf("%#lx", tcp->u_arg[2]);
1900                 else if (copy_sigset_len(tcp, tcp->u_arg[2], &sigset, tcp->u_arg[3]) < 0)
1901                         tprintf("[?]");
1902                 else
1903                         printsigmask(&sigset, 1);
1904                 tprintf(", %lu", tcp->u_arg[3]);
1905         }
1906         return 0;
1907 }
1908
1909
1910 /* Structure describing the action to be taken when a signal arrives.  */
1911 struct new_sigaction
1912 {
1913         __sighandler_t __sa_handler;
1914         unsigned long sa_flags;
1915         void (*sa_restorer) (void);
1916         /* Kernel treats sa_mask as an array of longs. */
1917         unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1918 };
1919 /* Same for i386-on-x86_64 and similar cases */
1920 struct new_sigaction32
1921 {
1922         uint32_t __sa_handler;
1923         uint32_t sa_flags;
1924         uint32_t sa_restorer;
1925         uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1926 };
1927
1928
1929 int
1930 sys_rt_sigaction(struct tcb *tcp)
1931 {
1932         struct new_sigaction sa;
1933         sigset_t sigset;
1934         long addr;
1935         int r;
1936
1937         if (entering(tcp)) {
1938                 printsignal(tcp->u_arg[0]);
1939                 tprintf(", ");
1940                 addr = tcp->u_arg[1];
1941         } else
1942                 addr = tcp->u_arg[2];
1943
1944         if (addr == 0) {
1945                 tprintf("NULL");
1946                 goto after_sa;
1947         }
1948         if (!verbose(tcp)) {
1949                 tprintf("%#lx", addr);
1950                 goto after_sa;
1951         }
1952 #if SUPPORTED_PERSONALITIES > 1
1953         if (personality_wordsize[current_personality] != sizeof(sa.sa_flags)
1954          && personality_wordsize[current_personality] == 4
1955         ) {
1956                 struct new_sigaction32 sa32;
1957                 r = umove(tcp, addr, &sa32);
1958                 if (r >= 0) {
1959                         memset(&sa, 0, sizeof(sa));
1960                         sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1961                         sa.sa_flags     = sa32.sa_flags;
1962                         sa.sa_restorer  = (void*)(unsigned long)sa32.sa_restorer;
1963                         /* Kernel treats sa_mask as an array of longs.
1964                          * For 32-bit process, "long" is uint32_t, thus, for example,
1965                          * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1966                          * But for (64-bit) kernel, 32th bit in sa_mask is
1967                          * 32th bit in 0th (64-bit) long!
1968                          * For little-endian, it's the same.
1969                          * For big-endian, we swap 32-bit words.
1970                          */
1971                         sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1972                 }
1973         } else
1974 #endif
1975         {
1976                 r = umove(tcp, addr, &sa);
1977         }
1978         if (r < 0) {
1979                 tprintf("{...}");
1980                 goto after_sa;
1981         }
1982         /* Architectures using function pointers, like
1983          * hppa, may need to manipulate the function pointer
1984          * to compute the result of a comparison. However,
1985          * the SA_HANDLER function pointer exists only in
1986          * the address space of the traced process, and can't
1987          * be manipulated by strace. In order to prevent the
1988          * compiler from generating code to manipulate
1989          * SA_HANDLER we cast the function pointers to long. */
1990         if ((long)sa.__sa_handler == (long)SIG_ERR)
1991                 tprintf("{SIG_ERR, ");
1992         else if ((long)sa.__sa_handler == (long)SIG_DFL)
1993                 tprintf("{SIG_DFL, ");
1994         else if ((long)sa.__sa_handler == (long)SIG_IGN)
1995                 tprintf("{SIG_IGN, ");
1996         else
1997                 tprintf("{%#lx, ", (long) sa.__sa_handler);
1998         /* Questionable code below.
1999          * Kernel won't handle sys_rt_sigaction
2000          * with wrong sigset size (just returns EINVAL)
2001          * therefore tcp->u_arg[3(4)] _must_ be NSIG / 8 here,
2002          * and we always use smaller memcpy. */
2003         sigemptyset(&sigset);
2004 #ifdef LINUXSPARC
2005         if (tcp->u_arg[4] <= sizeof(sigset))
2006                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[4]);
2007 #else
2008         if (tcp->u_arg[3] <= sizeof(sigset))
2009                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[3]);
2010 #endif
2011         else
2012                 memcpy(&sigset, &sa.sa_mask, sizeof(sigset));
2013         printsigmask(&sigset, 1);
2014         tprintf(", ");
2015         printflags(sigact_flags, sa.sa_flags, "SA_???");
2016 #ifdef SA_RESTORER
2017         if (sa.sa_flags & SA_RESTORER)
2018                 tprintf(", %p", sa.sa_restorer);
2019 #endif
2020         tprintf("}");
2021
2022  after_sa:
2023         if (entering(tcp))
2024                 tprintf(", ");
2025         else
2026 #ifdef LINUXSPARC
2027                 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
2028 #elif defined(ALPHA)
2029                 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
2030 #else
2031                 tprintf(", %lu", tcp->u_arg[3]);
2032 #endif
2033         return 0;
2034 }
2035
2036 int
2037 sys_rt_sigpending(struct tcb *tcp)
2038 {
2039         sigset_t sigset;
2040
2041         if (exiting(tcp)) {
2042                 if (syserror(tcp))
2043                         tprintf("%#lx", tcp->u_arg[0]);
2044                 else if (copy_sigset_len(tcp, tcp->u_arg[0],
2045                                          &sigset, tcp->u_arg[1]) < 0)
2046                         tprintf("[?]");
2047                 else
2048                         printsigmask(&sigset, 1);
2049         }
2050         return 0;
2051 }
2052
2053 int
2054 sys_rt_sigsuspend(struct tcb *tcp)
2055 {
2056         if (entering(tcp)) {
2057                 sigset_t sigm;
2058                 if (copy_sigset_len(tcp, tcp->u_arg[0], &sigm, tcp->u_arg[1]) < 0)
2059                         tprintf("[?]");
2060                 else
2061                         printsigmask(&sigm, 1);
2062         }
2063         return 0;
2064 }
2065
2066 int
2067 sys_rt_sigqueueinfo(struct tcb *tcp)
2068 {
2069         if (entering(tcp)) {
2070                 siginfo_t si;
2071                 tprintf("%lu, ", tcp->u_arg[0]);
2072                 printsignal(tcp->u_arg[1]);
2073                 tprintf(", ");
2074                 if (umove(tcp, tcp->u_arg[2], &si) < 0)
2075                         tprintf("%#lx", tcp->u_arg[2]);
2076                 else
2077                         printsiginfo(&si, verbose(tcp));
2078         }
2079         return 0;
2080 }
2081
2082 int sys_rt_sigtimedwait(struct tcb *tcp)
2083 {
2084         if (entering(tcp)) {
2085                 sigset_t sigset;
2086
2087                 if (copy_sigset_len(tcp, tcp->u_arg[0],
2088                                     &sigset, tcp->u_arg[3]) < 0)
2089                         tprintf("[?]");
2090                 else
2091                         printsigmask(&sigset, 1);
2092                 tprintf(", ");
2093                 /* This is the only "return" parameter, */
2094                 if (tcp->u_arg[1] != 0)
2095                         return 0;
2096                 /* ... if it's NULL, can decode all on entry */
2097                 tprintf("NULL, ");
2098         }
2099         else if (tcp->u_arg[1] != 0) {
2100                 /* syscall exit, and u_arg[1] wasn't NULL */
2101                 if (syserror(tcp))
2102                         tprintf("%#lx, ", tcp->u_arg[1]);
2103                 else {
2104                         siginfo_t si;
2105                         if (umove(tcp, tcp->u_arg[1], &si) < 0)
2106                                 tprintf("%#lx, ", tcp->u_arg[1]);
2107                         else {
2108                                 printsiginfo(&si, verbose(tcp));
2109                                 tprintf(", ");
2110                         }
2111                 }
2112         }
2113         else {
2114                 /* syscall exit, and u_arg[1] was NULL */
2115                 return 0;
2116         }
2117         print_timespec(tcp, tcp->u_arg[2]);
2118         tprintf(", %d", (int) tcp->u_arg[3]);
2119         return 0;
2120 };
2121
2122 int
2123 sys_restart_syscall(struct tcb *tcp)
2124 {
2125         if (entering(tcp))
2126                 tprintf("<... resuming interrupted call ...>");
2127         return 0;
2128 }
2129
2130 static int
2131 do_signalfd(struct tcb *tcp, int flags_arg)
2132 {
2133         if (entering(tcp)) {
2134                 tprintf("%ld, ", tcp->u_arg[0]);
2135                 print_sigset(tcp, tcp->u_arg[1], 1);
2136                 tprintf(", %lu", tcp->u_arg[2]);
2137                 if (flags_arg >= 0) {
2138                         tprintf(", ");
2139                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
2140                 }
2141         }
2142         return 0;
2143 }
2144
2145 int
2146 sys_signalfd(struct tcb *tcp)
2147 {
2148         return do_signalfd(tcp, -1);
2149 }
2150
2151 int
2152 sys_signalfd4(struct tcb *tcp)
2153 {
2154         return do_signalfd(tcp, 3);
2155 }
2156 #endif /* LINUX */