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         const char *format;
 319         char *s;
 320         static char outstr[8 * sizeof(sigset_t) * 8];
 321
 322         strcpy(outstr, str);
 323         s = outstr + strlen(outstr);
 324         nsigs = 0;
 325         maxsigs = nsignals;
 326 #ifdef __SIGRTMAX
 327         if (rt)
 328                 maxsigs = __SIGRTMAX; /* instead */
 329 #endif
 330         for (i = 1; i < maxsigs; i++) {
 331                 if (sigismember(mask, i) == 1)
 332                         nsigs++;
 333         }
 334         if (nsigs >= nsignals * 2 / 3) {
 335                 *s++ = '~';
 336                 for (i = 1; i < maxsigs; i++) {
 337                         switch (sigismember(mask, i)) {
 338                         case 1:
 339                                 sigdelset(mask, i);
 340                                 break;
 341                         case 0:
 342                                 sigaddset(mask, i);
 343                                 break;
 344                         }
 345                 }
 346         }
 347         format = "%s";
 348         *s++ = '[';
 349         for (i = 1; i < maxsigs; i++) {
 350                 if (sigismember(mask, i) == 1) {
 351                         /* real-time signals on solaris don't have
 352                          * signalent entries
 353                          */
 354                         if (i < nsignals) {
 355                                 sprintf(s, format, signalent[i] + 3);
 356                         }
 357 #ifdef SIGRTMIN
 358                         else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
 359                                 char tsig[40];
 360                                 sprintf(tsig, "RT_%u", i - __SIGRTMIN);
 361                                 sprintf(s, format, tsig);
 362                         }
 363 #endif /* SIGRTMIN */
 364                         else {
 365                                 char tsig[32];
 366                                 sprintf(tsig, "%u", i);
 367                                 sprintf(s, format, tsig);
 368                         }
 369                         s += strlen(s);
 370                         format = " %s";
 371                 }
 372         }
 373         *s++ = ']';
 374         *s = '\0';
 375         return outstr;
 376 }
 377
 378 static void
 379 printsigmask(mask, rt)
 380 sigset_t *mask;
 381 int rt;
 382 {
 383         tprintf("%s", sprintsigmask("", mask, rt));
 384 }
 385
 386 void
 387 printsignal(nr)
 388 int nr;
 389 {
 390         tprintf("%s", signame(nr));
 391 }
 392
 393 void
 394 print_sigset(struct tcb *tcp, long addr, int rt)
 395 {
 396         sigset_t ss;
 397
 398         if (!addr)
 399                 tprintf("NULL");
 400         else if (copy_sigset(tcp, addr, &ss) < 0)
 401                 tprintf("%#lx", addr);
 402         else
 403                 printsigmask(&ss, rt);
 404 }
 405
 406 #ifdef LINUX
 407
 408 #ifndef ILL_ILLOPC
 409 #define ILL_ILLOPC      1       /* illegal opcode */
 410 #define ILL_ILLOPN      2       /* illegal operand */
 411 #define ILL_ILLADR      3       /* illegal addressing mode */
 412 #define ILL_ILLTRP      4       /* illegal trap */
 413 #define ILL_PRVOPC      5       /* privileged opcode */
 414 #define ILL_PRVREG      6       /* privileged register */
 415 #define ILL_COPROC      7       /* coprocessor error */
 416 #define ILL_BADSTK      8       /* internal stack error */
 417 #define FPE_INTDIV      1       /* integer divide by zero */
 418 #define FPE_INTOVF      2       /* integer overflow */
 419 #define FPE_FLTDIV      3       /* floating point divide by zero */
 420 #define FPE_FLTOVF      4       /* floating point overflow */
 421 #define FPE_FLTUND      5       /* floating point underflow */
 422 #define FPE_FLTRES      6       /* floating point inexact result */
 423 #define FPE_FLTINV      7       /* floating point invalid operation */
 424 #define FPE_FLTSUB      8       /* subscript out of range */
 425 #define SEGV_MAPERR     1       /* address not mapped to object */
 426 #define SEGV_ACCERR     2       /* invalid permissions for mapped object */
 427 #define BUS_ADRALN      1       /* invalid address alignment */
 428 #define BUS_ADRERR      2       /* non-existant physical address */
 429 #define BUS_OBJERR      3       /* object specific hardware error */
 430 #define TRAP_BRKPT      1       /* process breakpoint */
 431 #define TRAP_TRACE      2       /* process trace trap */
 432 #define CLD_EXITED      1       /* child has exited */
 433 #define CLD_KILLED      2       /* child was killed */
 434 #define CLD_DUMPED      3       /* child terminated abnormally */
 435 #define CLD_TRAPPED     4       /* traced child has trapped */
 436 #define CLD_STOPPED     5       /* child has stopped */
 437 #define CLD_CONTINUED   6       /* stopped child has continued */
 438 #define POLL_IN         1       /* data input available */
 439 #define POLL_OUT        2       /* output buffers available */
 440 #define POLL_MSG        3       /* input message available */
 441 #define POLL_ERR        4       /* i/o error */
 442 #define POLL_PRI        5       /* high priority input available */
 443 #define POLL_HUP        6       /* device disconnected */
 444 #define SI_USER         0       /* sent by kill, sigsend, raise */
 445 #define SI_QUEUE        -1      /* sent by sigqueue */
 446 #define SI_TIMER        -2      /* sent by timer expiration */
 447 #define SI_MESGQ        -3      /* sent by real time mesq state change */
 448 #define SI_ASYNCIO      -4      /* sent by AIO completion */
 449 #define SI_SIGIO        -5      /* Sent by SIGIO */
 450 #define SI_TKILL        -6      /* Sent by tkill */
 451 #endif
 452
 453 #if __GLIBC_MINOR__ < 1
 454 /* Type for data associated with a signal.  */
 455 typedef union sigval
 456 {
 457         int sival_int;
 458         void *sival_ptr;
 459 } sigval_t;
 460
 461 # define __SI_MAX_SIZE     128
 462 # define __SI_PAD_SIZE     ((__SI_MAX_SIZE / sizeof (int)) - 3)
 463
 464 typedef struct siginfo
 465 {
 466         int si_signo;               /* Signal number.  */
 467         int si_errno;               /* If non-zero, an errno value associated with
 468                                                                    this signal, as defined in <errno.h>.  */
 469         int si_code;                /* Signal code.  */
 470
 471         union
 472         {
 473                 int _pad[__SI_PAD_SIZE];
 474
 475                 /* kill().  */
 476                 struct
 477                 {
 478                         __pid_t si_pid;     /* Sending process ID.  */
 479                         __uid_t si_uid;     /* Real user ID of sending process.  */
 480                 } _kill;
 481
 482                 /* POSIX.1b timers.  */
 483                 struct
 484                 {
 485                         unsigned int _timer1;
 486                         unsigned int _timer2;
 487                 } _timer;
 488
 489                 /* POSIX.1b signals.  */
 490                 struct
 491                 {
 492                         __pid_t si_pid;     /* Sending process ID.  */
 493                         __uid_t si_uid;     /* Real user ID of sending process.  */
 494                         sigval_t si_sigval; /* Signal value.  */
 495                 } _rt;
 496
 497                 /* SIGCHLD.  */
 498                 struct
 499                 {
 500                         __pid_t si_pid;     /* Which child.  */
 501                         int si_status;      /* Exit value or signal.  */
 502                         __clock_t si_utime;
 503                         __clock_t si_stime;
 504                 } _sigchld;
 505
 506                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
 507                 struct
 508                 {
 509                         void *si_addr;      /* Faulting insn/memory ref.  */
 510                 } _sigfault;
 511
 512                 /* SIGPOLL.  */
 513                 struct
 514                 {
 515                         int si_band;        /* Band event for SIGPOLL.  */
 516                         int si_fd;
 517                 } _sigpoll;
 518         } _sifields;
 519 } siginfo_t;
 520
 521 #define si_pid          _sifields._kill.si_pid
 522 #define si_uid          _sifields._kill.si_uid
 523 #define si_status       _sifields._sigchld.si_status
 524 #define si_utime        _sifields._sigchld.si_utime
 525 #define si_stime        _sifields._sigchld.si_stime
 526 #define si_value        _sifields._rt.si_sigval
 527 #define si_int          _sifields._rt.si_sigval.sival_int
 528 #define si_ptr          _sifields._rt.si_sigval.sival_ptr
 529 #define si_addr         _sifields._sigfault.si_addr
 530 #define si_band         _sifields._sigpoll.si_band
 531 #define si_fd           _sifields._sigpoll.si_fd
 532
 533 #endif
 534
 535 #endif
 536
 537 #if defined (SVR4) || defined (LINUX)
 538
 539 static const struct xlat siginfo_codes[] = {
 540 #ifdef SI_NOINFO
 541         { SI_NOINFO,    "SI_NOINFO"     },
 542 #endif
 543 #ifdef SI_USER
 544         { SI_USER,      "SI_USER"       },
 545 #endif
 546 #ifdef SI_LWP
 547         { SI_LWP,       "SI_LWP"        },
 548 #endif
 549 #ifdef SI_QUEUE
 550         { SI_QUEUE,     "SI_QUEUE"      },
 551 #endif
 552 #ifdef SI_TIMER
 553         { SI_TIMER,     "SI_TIMER"      },
 554 #endif
 555 #ifdef SI_ASYNCIO
 556         { SI_ASYNCIO,   "SI_ASYNCIO"    },
 557 #endif
 558 #ifdef SI_MESGQ
 559         { SI_MESGQ,     "SI_MESGQ"      },
 560 #endif
 561 #ifdef SI_SIGIO
 562         { SI_SIGIO,     "SI_SIGIO"      },
 563 #endif
 564 #ifdef SI_TKILL
 565         { SI_TKILL,     "SI_TKILL"      },
 566 #endif
 567         { 0,            NULL            },
 568 };
 569
 570 static const struct xlat sigill_codes[] = {
 571         { ILL_ILLOPC,   "ILL_ILLOPC"    },
 572         { ILL_ILLOPN,   "ILL_ILLOPN"    },
 573         { ILL_ILLADR,   "ILL_ILLADR"    },
 574         { ILL_ILLTRP,   "ILL_ILLTRP"    },
 575         { ILL_PRVOPC,   "ILL_PRVOPC"    },
 576         { ILL_PRVREG,   "ILL_PRVREG"    },
 577         { ILL_COPROC,   "ILL_COPROC"    },
 578         { ILL_BADSTK,   "ILL_BADSTK"    },
 579         { 0,            NULL            },
 580 };
 581
 582 static const struct xlat sigfpe_codes[] = {
 583         { FPE_INTDIV,   "FPE_INTDIV"    },
 584         { FPE_INTOVF,   "FPE_INTOVF"    },
 585         { FPE_FLTDIV,   "FPE_FLTDIV"    },
 586         { FPE_FLTOVF,   "FPE_FLTOVF"    },
 587         { FPE_FLTUND,   "FPE_FLTUND"    },
 588         { FPE_FLTRES,   "FPE_FLTRES"    },
 589         { FPE_FLTINV,   "FPE_FLTINV"    },
 590         { FPE_FLTSUB,   "FPE_FLTSUB"    },
 591         { 0,            NULL            },
 592 };
 593
 594 static const struct xlat sigtrap_codes[] = {
 595         { TRAP_BRKPT,   "TRAP_BRKPT"    },
 596         { TRAP_TRACE,   "TRAP_TRACE"    },
 597         { 0,            NULL            },
 598 };
 599
 600 static const struct xlat sigchld_codes[] = {
 601         { CLD_EXITED,   "CLD_EXITED"    },
 602         { CLD_KILLED,   "CLD_KILLED"    },
 603         { CLD_DUMPED,   "CLD_DUMPED"    },
 604         { CLD_TRAPPED,  "CLD_TRAPPED"   },
 605         { CLD_STOPPED,  "CLD_STOPPED"   },
 606         { CLD_CONTINUED,"CLD_CONTINUED" },
 607         { 0,            NULL            },
 608 };
 609
 610 static const struct xlat sigpoll_codes[] = {
 611         { POLL_IN,      "POLL_IN"       },
 612         { POLL_OUT,     "POLL_OUT"      },
 613         { POLL_MSG,     "POLL_MSG"      },
 614         { POLL_ERR,     "POLL_ERR"      },
 615         { POLL_PRI,     "POLL_PRI"      },
 616         { POLL_HUP,     "POLL_HUP"      },
 617         { 0,            NULL            },
 618 };
 619
 620 static const struct xlat sigprof_codes[] = {
 621 #ifdef PROF_SIG
 622         { PROF_SIG,     "PROF_SIG"      },
 623 #endif
 624         { 0,            NULL            },
 625 };
 626
 627 #ifdef SIGEMT
 628 static const struct xlat sigemt_codes[] = {
 629 #ifdef EMT_TAGOVF
 630         { EMT_TAGOVF,   "EMT_TAGOVF"    },
 631 #endif
 632         { 0,            NULL            },
 633 };
 634 #endif
 635
 636 static const struct xlat sigsegv_codes[] = {
 637         { SEGV_MAPERR,  "SEGV_MAPERR"   },
 638         { SEGV_ACCERR,  "SEGV_ACCERR"   },
 639         { 0,            NULL            },
 640 };
 641
 642 static const struct xlat sigbus_codes[] = {
 643         { BUS_ADRALN,   "BUS_ADRALN"    },
 644         { BUS_ADRERR,   "BUS_ADRERR"    },
 645         { BUS_OBJERR,   "BUS_OBJERR"    },
 646         { 0,            NULL            },
 647 };
 648
 649 void
 650 printsiginfo(sip, verbose)
 651 siginfo_t *sip;
 652 int verbose;
 653 {
 654         const char *code;
 655
 656         if (sip->si_signo == 0) {
 657                 tprintf ("{}");
 658                 return;
 659         }
 660         tprintf("{si_signo=");
 661         printsignal(sip->si_signo);
 662         code = xlookup(siginfo_codes, sip->si_code);
 663         if (!code) {
 664                 switch (sip->si_signo) {
 665                 case SIGTRAP:
 666                         code = xlookup(sigtrap_codes, sip->si_code);
 667                         break;
 668                 case SIGCHLD:
 669                         code = xlookup(sigchld_codes, sip->si_code);
 670                         break;
 671                 case SIGPOLL:
 672                         code = xlookup(sigpoll_codes, sip->si_code);
 673                         break;
 674                 case SIGPROF:
 675                         code = xlookup(sigprof_codes, sip->si_code);
 676                         break;
 677                 case SIGILL:
 678                         code = xlookup(sigill_codes, sip->si_code);
 679                         break;
 680 #ifdef SIGEMT
 681                 case SIGEMT:
 682                         code = xlookup(sigemt_codes, sip->si_code);
 683                         break;
 684 #endif
 685                 case SIGFPE:
 686                         code = xlookup(sigfpe_codes, sip->si_code);
 687                         break;
 688                 case SIGSEGV:
 689                         code = xlookup(sigsegv_codes, sip->si_code);
 690                         break;
 691                 case SIGBUS:
 692                         code = xlookup(sigbus_codes, sip->si_code);
 693                         break;
 694                 }
 695         }
 696         if (code)
 697                 tprintf(", si_code=%s", code);
 698         else
 699                 tprintf(", si_code=%#x", sip->si_code);
 700 #ifdef SI_NOINFO
 701         if (sip->si_code != SI_NOINFO)
 702 #endif
 703         {
 704                 if (sip->si_errno) {
 705                         if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
 706                                 tprintf(", si_errno=%d", sip->si_errno);
 707                         else
 708                                 tprintf(", si_errno=%s",
 709                                         errnoent[sip->si_errno]);
 710                 }
 711 #ifdef SI_FROMUSER
 712                 if (SI_FROMUSER(sip)) {
 713                         tprintf(", si_pid=%ld, si_uid=%ld",
 714                                 sip->si_pid, sip->si_uid);
 715 #ifdef SI_QUEUE
 716                         switch (sip->si_code) {
 717                         case SI_QUEUE:
 718 #ifdef SI_TIMER
 719                         case SI_TIMER:
 720 #endif /* SI_QUEUE */
 721                         case SI_ASYNCIO:
 722 #ifdef SI_MESGQ
 723                         case SI_MESGQ:
 724 #endif /* SI_MESGQ */
 725                                 tprintf(", si_value=%d",
 726                                         sip->si_value.sival_int);
 727                                 break;
 728                         }
 729 #endif /* SI_QUEUE */
 730                 }
 731                 else
 732 #endif /* SI_FROMUSER */
 733                 {
 734                         switch (sip->si_signo) {
 735                         case SIGCHLD:
 736                                 tprintf(", si_pid=%ld, si_status=",
 737                                         (long) sip->si_pid);
 738                                 if (sip->si_code == CLD_EXITED)
 739                                         tprintf("%d", sip->si_status);
 740                                 else
 741                                         printsignal(sip->si_status);
 742 #if LINUX
 743                                 if (!verbose)
 744                                         tprintf(", ...");
 745                                 else
 746                                         tprintf(", si_utime=%lu, si_stime=%lu",
 747                                                 sip->si_utime,
 748                                                 sip->si_stime);
 749 #endif
 750                                 break;
 751                         case SIGILL: case SIGFPE:
 752                         case SIGSEGV: case SIGBUS:
 753                                 tprintf(", si_addr=%#lx",
 754                                         (unsigned long) sip->si_addr);
 755                                 break;
 756                         case SIGPOLL:
 757                                 switch (sip->si_code) {
 758                                 case POLL_IN: case POLL_OUT: case POLL_MSG:
 759                                         tprintf(", si_band=%ld",
 760                                                 (long) sip->si_band);
 761                                         break;
 762                                 }
 763                                 break;
 764 #ifdef LINUX
 765                         default:
 766                                 tprintf(", si_pid=%lu, si_uid=%lu, ",
 767                                         (unsigned long) sip->si_pid,
 768                                         (unsigned long) sip->si_uid);
 769                                 if (!verbose)
 770                                         tprintf("...");
 771                                 else {
 772                                         tprintf("si_value={int=%u, ptr=%#lx}",
 773                                                 sip->si_int,
 774                                                 (unsigned long) sip->si_ptr);
 775                                 }
 776 #endif
 777
 778                         }
 779                 }
 780         }
 781         tprintf("}");
 782 }
 783
 784 #endif /* SVR4 || LINUX */
 785
 786 #ifdef LINUX
 787
 788 static void
 789 parse_sigset_t(const char *str, sigset_t *set)
 790 {
 791         const char *p;
 792         unsigned int digit;
 793         int i;
 794
 795         sigemptyset(set);
 796
 797         p = strchr(str, '\n');
 798         if (p == NULL)
 799                 p = strchr(str, '\0');
 800         for (i = 0; p-- > str; i += 4) {
 801                 if (*p >= '0' && *p <= '9')
 802                         digit = *p - '0';
 803                 else if (*p >= 'a' && *p <= 'f')
 804                         digit = *p - 'a' + 10;
 805                 else if (*p >= 'A' && *p <= 'F')
 806                         digit = *p - 'A' + 10;
 807                 else
 808                         break;
 809                 if (digit & 1)
 810                         sigaddset(set, i + 1);
 811                 if (digit & 2)
 812                         sigaddset(set, i + 2);
 813                 if (digit & 4)
 814                         sigaddset(set, i + 3);
 815                 if (digit & 8)
 816                         sigaddset(set, i + 4);
 817         }
 818 }
 819
 820 #endif
 821
 822 /*
 823  * Check process TCP for the disposition of signal SIG.
 824  * Return 1 if the process would somehow manage to  survive signal SIG,
 825  * else return 0.  This routine will never be called with SIGKILL.
 826  */
 827 int
 828 sigishandled(tcp, sig)
 829 struct tcb *tcp;
 830 int sig;
 831 {
 832 #ifdef LINUX
 833         int sfd;
 834         char sname[32];
 835         char buf[2048];
 836         const char *s;
 837         int i;
 838         sigset_t ignored, caught;
 839 #endif
 840 #ifdef SVR4
 841         /*
 842          * Since procfs doesn't interfere with wait I think it is safe
 843          * to punt on this question.  If not, the information is there.
 844          */
 845         return 1;
 846 #else /* !SVR4 */
 847         switch (sig) {
 848         case SIGCONT:
 849         case SIGSTOP:
 850         case SIGTSTP:
 851         case SIGTTIN:
 852         case SIGTTOU:
 853         case SIGCHLD:
 854         case SIGIO:
 855 #if defined(SIGURG) && SIGURG != SIGIO
 856         case SIGURG:
 857 #endif
 858         case SIGWINCH:
 859                 /* Gloria Gaynor says ... */
 860                 return 1;
 861         default:
 862                 break;
 863         }
 864 #endif /* !SVR4 */
 865 #ifdef LINUX
 866
 867         /* This is incredibly costly but it's worth it. */
 868         /* NOTE: LinuxThreads internally uses SIGRTMIN, SIGRTMIN + 1 and
 869            SIGRTMIN + 2, so we can't use the obsolete /proc/%d/stat which
 870            doesn't handle real-time signals). */
 871         sprintf(sname, "/proc/%d/status", tcp->pid);
 872         if ((sfd = open(sname, O_RDONLY)) == -1) {
 873                 perror(sname);
 874                 return 1;
 875         }
 876         i = read(sfd, buf, sizeof(buf));
 877         buf[i] = '\0';
 878         close(sfd);
 879         /*
 880          * Skip the extraneous fields. We need to skip
 881          * command name has any spaces in it.  So be it.
 882          */
 883         s = strstr(buf, "SigIgn:\t");
 884         if (!s)
 885         {
 886                 fprintf(stderr, "/proc/pid/status format error\n");
 887                 return 1;
 888         }
 889         parse_sigset_t(s + 8, &ignored);
 890
 891         s = strstr(buf, "SigCgt:\t");
 892         if (!s)
 893         {
 894                 fprintf(stderr, "/proc/pid/status format error\n");
 895                 return 1;
 896         }
 897         parse_sigset_t(s + 8, &caught);
 898
 899 #ifdef DEBUG
 900         fprintf(stderr, "sigs: %016qx %016qx (sig=%d)\n",
 901                 *(long long *) &ignored, *(long long *) &caught, sig);
 902 #endif
 903         if (sigismember(&ignored, sig) || sigismember(&caught, sig))
 904                 return 1;
 905 #endif /* LINUX */
 906
 907 #ifdef SUNOS4
 908         void (*u_signal)();
 909
 910         if (upeek(tcp, uoff(u_signal[0]) + sig*sizeof(u_signal),
 911             (long *) &u_signal) < 0) {
 912                 return 0;
 913         }
 914         if (u_signal != SIG_DFL)
 915                 return 1;
 916 #endif /* SUNOS4 */
 917
 918         return 0;
 919 }
 920
 921 #if defined(SUNOS4) || defined(FREEBSD)
 922
 923 int
 924 sys_sigvec(tcp)
 925 struct tcb *tcp;
 926 {
 927         struct sigvec sv;
 928         long addr;
 929
 930         if (entering(tcp)) {
 931                 printsignal(tcp->u_arg[0]);
 932                 tprintf(", ");
 933                 addr = tcp->u_arg[1];
 934         } else {
 935                 addr = tcp->u_arg[2];
 936         }
 937         if (addr == 0)
 938                 tprintf("NULL");
 939         else if (!verbose(tcp))
 940                 tprintf("%#lx", addr);
 941         else if (umove(tcp, addr, &sv) < 0)
 942                 tprintf("{...}");
 943         else {
 944                 switch ((int) sv.sv_handler) {
 945                 case (int) SIG_ERR:
 946                         tprintf("{SIG_ERR}");
 947                         break;
 948                 case (int) SIG_DFL:
 949                         tprintf("{SIG_DFL}");
 950                         break;
 951                 case (int) SIG_IGN:
 952                         if (tcp->u_arg[0] == SIGTRAP) {
 953                                 tcp->flags |= TCB_SIGTRAPPED;
 954                                 kill(tcp->pid, SIGSTOP);
 955                         }
 956                         tprintf("{SIG_IGN}");
 957                         break;
 958                 case (int) SIG_HOLD:
 959                         if (tcp->u_arg[0] == SIGTRAP) {
 960                                 tcp->flags |= TCB_SIGTRAPPED;
 961                                 kill(tcp->pid, SIGSTOP);
 962                         }
 963                         tprintf("SIG_HOLD");
 964                         break;
 965                 default:
 966                         if (tcp->u_arg[0] == SIGTRAP) {
 967                                 tcp->flags |= TCB_SIGTRAPPED;
 968                                 kill(tcp->pid, SIGSTOP);
 969                         }
 970                         tprintf("{%#lx, ", (unsigned long) sv.sv_handler);
 971                         printsigmask(&sv.sv_mask, 0);
 972                         tprintf(", ");
 973                         printflags(sigvec_flags, sv.sv_flags, "SV_???");
 974                         tprintf("}");
 975                 }
 976         }
 977         if (entering(tcp))
 978                 tprintf(", ");
 979         return 0;
 980 }
 981
 982 int
 983 sys_sigpause(tcp)
 984 struct tcb *tcp;
 985 {
 986         if (entering(tcp)) {    /* WTA: UD had a bug here: he forgot the braces */
 987                 sigset_t sigm;
 988                 long_to_sigset(tcp->u_arg[0], &sigm);
 989                 printsigmask(&sigm, 0);
 990         }
 991         return 0;
 992 }
 993
 994 int
 995 sys_sigstack(tcp)
 996 struct tcb *tcp;
 997 {
 998         struct sigstack ss;
 999         long addr;
1000
1001         if (entering(tcp))
1002                 addr = tcp->u_arg[0];
1003         else
1004                 addr = tcp->u_arg[1];
1005         if (addr == 0)
1006                 tprintf("NULL");
1007         else if (umove(tcp, addr, &ss) < 0)
1008                 tprintf("%#lx", addr);
1009         else {
1010                 tprintf("{ss_sp %#lx ", (unsigned long) ss.ss_sp);
1011                 tprintf("ss_onstack %s}", ss.ss_onstack ? "YES" : "NO");
1012         }
1013         if (entering(tcp))
1014                 tprintf(", ");
1015         return 0;
1016 }
1017
1018 int
1019 sys_sigcleanup(tcp)
1020 struct tcb *tcp;
1021 {
1022         return 0;
1023 }
1024
1025 #endif /* SUNOS4 || FREEBSD */
1026
1027 #ifndef SVR4
1028
1029 int
1030 sys_sigsetmask(tcp)
1031 struct tcb *tcp;
1032 {
1033         if (entering(tcp)) {
1034                 sigset_t sigm;
1035                 long_to_sigset(tcp->u_arg[0], &sigm);
1036                 printsigmask(&sigm, 0);
1037 #ifndef USE_PROCFS
1038                 if ((tcp->u_arg[0] & sigmask(SIGTRAP))) {
1039                         /* Mark attempt to block SIGTRAP */
1040                         tcp->flags |= TCB_SIGTRAPPED;
1041                         /* Send unblockable signal */
1042                         kill(tcp->pid, SIGSTOP);
1043                 }
1044 #endif /* !USE_PROCFS */
1045         }
1046         else if (!syserror(tcp)) {
1047                 sigset_t sigm;
1048                 long_to_sigset(tcp->u_rval, &sigm);
1049                 tcp->auxstr = sprintsigmask("old mask ", &sigm, 0);
1050
1051                 return RVAL_HEX | RVAL_STR;
1052         }
1053         return 0;
1054 }
1055
1056 #if defined(SUNOS4) || defined(FREEBSD)
1057 int
1058 sys_sigblock(tcp)
1059 struct tcb *tcp;
1060 {
1061         return sys_sigsetmask(tcp);
1062 }
1063 #endif /* SUNOS4 || FREEBSD */
1064
1065 #endif /* !SVR4 */
1066
1067 #ifdef HAVE_SIGACTION
1068
1069 #ifdef LINUX
1070 struct old_sigaction {
1071         __sighandler_t __sa_handler;
1072         unsigned long sa_mask;
1073         unsigned long sa_flags;
1074         void (*sa_restorer)(void);
1075 };
1076 #define SA_HANDLER __sa_handler
1077 #endif /* LINUX */
1078
1079 #ifndef SA_HANDLER
1080 #define SA_HANDLER sa_handler
1081 #endif
1082
1083 int
1084 sys_sigaction(tcp)
1085 struct tcb *tcp;
1086 {
1087         long addr;
1088 #ifdef LINUX
1089         sigset_t sigset;
1090         struct old_sigaction sa;
1091 #else
1092         struct sigaction sa;
1093 #endif
1094
1095
1096         if (entering(tcp)) {
1097                 printsignal(tcp->u_arg[0]);
1098                 tprintf(", ");
1099                 addr = tcp->u_arg[1];
1100         } else
1101                 addr = tcp->u_arg[2];
1102         if (addr == 0)
1103                 tprintf("NULL");
1104         else if (!verbose(tcp))
1105                 tprintf("%#lx", addr);
1106         else if (umove(tcp, addr, &sa) < 0)
1107                 tprintf("{...}");
1108         else {
1109                 /* Architectures using function pointers, like
1110                  * hppa, may need to manipulate the function pointer
1111                  * to compute the result of a comparison. However,
1112                  * the SA_HANDLER function pointer exists only in
1113                  * the address space of the traced process, and can't
1114                  * be manipulated by strace. In order to prevent the
1115                  * compiler from generating code to manipulate
1116                  * SA_HANDLER we cast the function pointers to long. */
1117                 if ((long)sa.SA_HANDLER == (long)SIG_ERR)
1118                         tprintf("{SIG_ERR, ");
1119                 else if ((long)sa.SA_HANDLER == (long)SIG_DFL)
1120                         tprintf("{SIG_DFL, ");
1121                 else if ((long)sa.SA_HANDLER == (long)SIG_IGN) {
1122 #ifndef USE_PROCFS
1123                         if (tcp->u_arg[0] == SIGTRAP) {
1124                                 tcp->flags |= TCB_SIGTRAPPED;
1125                                 kill(tcp->pid, SIGSTOP);
1126                         }
1127 #endif /* !USE_PROCFS */
1128                         tprintf("{SIG_IGN, ");
1129                 }
1130                 else {
1131 #ifndef USE_PROCFS
1132                         if (tcp->u_arg[0] == SIGTRAP) {
1133                                 tcp->flags |= TCB_SIGTRAPPED;
1134                                 kill(tcp->pid, SIGSTOP);
1135                         }
1136 #endif /* !USE_PROCFS */
1137                         tprintf("{%#lx, ", (long) sa.SA_HANDLER);
1138 #ifndef LINUX
1139                         printsigmask (&sa.sa_mask, 0);
1140 #else
1141                         long_to_sigset(sa.sa_mask, &sigset);
1142                         printsigmask(&sigset, 0);
1143 #endif
1144                         tprintf(", ");
1145                         printflags(sigact_flags, sa.sa_flags, "SA_???");
1146 #ifdef SA_RESTORER
1147                         if (sa.sa_flags & SA_RESTORER)
1148                                 tprintf(", %p", sa.sa_restorer);
1149 #endif
1150                         tprintf("}");
1151                 }
1152         }
1153         if (entering(tcp))
1154                 tprintf(", ");
1155 #ifdef LINUX
1156         else
1157                 tprintf(", %#lx", (unsigned long) sa.sa_restorer);
1158 #endif
1159         return 0;
1160 }
1161
1162 int
1163 sys_signal(tcp)
1164 struct tcb *tcp;
1165 {
1166         if (entering(tcp)) {
1167                 printsignal(tcp->u_arg[0]);
1168                 tprintf(", ");
1169                 switch (tcp->u_arg[1]) {
1170                 case (long) SIG_ERR:
1171                         tprintf("SIG_ERR");
1172                         break;
1173                 case (long) SIG_DFL:
1174                         tprintf("SIG_DFL");
1175                         break;
1176                 case (long) SIG_IGN:
1177 #ifndef USE_PROCFS
1178                         if (tcp->u_arg[0] == SIGTRAP) {
1179                                 tcp->flags |= TCB_SIGTRAPPED;
1180                                 kill(tcp->pid, SIGSTOP);
1181                         }
1182 #endif /* !USE_PROCFS */
1183                         tprintf("SIG_IGN");
1184                         break;
1185                 default:
1186 #ifndef USE_PROCFS
1187                         if (tcp->u_arg[0] == SIGTRAP) {
1188                                 tcp->flags |= TCB_SIGTRAPPED;
1189                                 kill(tcp->pid, SIGSTOP);
1190                         }
1191 #endif /* !USE_PROCFS */
1192                         tprintf("%#lx", tcp->u_arg[1]);
1193                 }
1194                 return 0;
1195         }
1196         else if (!syserror(tcp)) {
1197                 switch (tcp->u_rval) {
1198                     case (long) SIG_ERR:
1199                         tcp->auxstr = "SIG_ERR"; break;
1200                     case (long) SIG_DFL:
1201                         tcp->auxstr = "SIG_DFL"; break;
1202                     case (long) SIG_IGN:
1203                         tcp->auxstr = "SIG_IGN"; break;
1204                     default:
1205                         tcp->auxstr = NULL;
1206                 }
1207                 return RVAL_HEX | RVAL_STR;
1208         }
1209         return 0;
1210 }
1211
1212 #ifdef SVR4
1213 int
1214 sys_sighold(tcp)
1215 struct tcb *tcp;
1216 {
1217         if (entering(tcp)) {
1218                 printsignal(tcp->u_arg[0]);
1219         }
1220         return 0;
1221 }
1222 #endif /* SVR4 */
1223
1224 #endif /* HAVE_SIGACTION */
1225
1226 #ifdef LINUX
1227
1228 int
1229 sys_sigreturn(struct tcb *tcp)
1230 {
1231 #if defined(ARM)
1232         struct pt_regs regs;
1233         struct sigcontext_struct sc;
1234
1235         if (entering(tcp)) {
1236                 tcp->u_arg[0] = 0;
1237
1238                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)&regs) == -1)
1239                         return 0;
1240
1241                 if (umove(tcp, regs.ARM_sp, &sc) < 0)
1242                         return 0;
1243
1244                 tcp->u_arg[0] = 1;
1245                 tcp->u_arg[1] = sc.oldmask;
1246         } else {
1247                 sigset_t sigm;
1248                 long_to_sigset(tcp->u_arg[1], &sigm);
1249                 tcp->u_rval = tcp->u_error = 0;
1250                 if (tcp->u_arg[0] == 0)
1251                         return 0;
1252                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1253                 return RVAL_NONE | RVAL_STR;
1254         }
1255         return 0;
1256 #elif defined(S390) || defined(S390X)
1257         long usp;
1258         struct sigcontext_struct sc;
1259
1260         if (entering(tcp)) {
1261                 tcp->u_arg[0] = 0;
1262                 if (upeek(tcp,PT_GPR15,&usp)<0)
1263                         return 0;
1264                 if (umove(tcp, usp+__SIGNAL_FRAMESIZE, &sc) < 0)
1265                         return 0;
1266                 tcp->u_arg[0] = 1;
1267                 memcpy(&tcp->u_arg[1],&sc.oldmask[0],sizeof(sigset_t));
1268         } else {
1269                 tcp->u_rval = tcp->u_error = 0;
1270                 if (tcp->u_arg[0] == 0)
1271                         return 0;
1272                 tcp->auxstr = sprintsigmask("mask now ",(sigset_t *)&tcp->u_arg[1],0);
1273                 return RVAL_NONE | RVAL_STR;
1274         }
1275         return 0;
1276 #elif defined(I386)
1277         long esp;
1278         struct sigcontext_struct sc;
1279
1280         if (entering(tcp)) {
1281                 tcp->u_arg[0] = 0;
1282                 if (upeek(tcp, 4*UESP, &esp) < 0)
1283                         return 0;
1284                 if (umove(tcp, esp, &sc) < 0)
1285                         return 0;
1286                 tcp->u_arg[0] = 1;
1287                 tcp->u_arg[1] = sc.oldmask;
1288         }
1289         else {
1290                 sigset_t sigm;
1291                 long_to_sigset(tcp->u_arg[1], &sigm);
1292                 tcp->u_rval = tcp->u_error = 0;
1293                 if (tcp->u_arg[0] == 0)
1294                         return 0;
1295                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1296                 return RVAL_NONE | RVAL_STR;
1297         }
1298         return 0;
1299 #elif defined(IA64)
1300         struct sigcontext sc;
1301         long sp;
1302
1303         if (entering(tcp)) {
1304                 /* offset of sigcontext in the kernel's sigframe structure: */
1305 #               define SIGFRAME_SC_OFFSET       0x90
1306                 tcp->u_arg[0] = 0;
1307                 if (upeek(tcp, PT_R12, &sp) < 0)
1308                         return 0;
1309                 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
1310                         return 0;
1311                 tcp->u_arg[0] = 1;
1312                 memcpy(tcp->u_arg + 1, &sc.sc_mask, sizeof(sc.sc_mask));
1313         }
1314         else {
1315                 sigset_t sigm;
1316
1317                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1318                 tcp->u_rval = tcp->u_error = 0;
1319                 if (tcp->u_arg[0] == 0)
1320                         return 0;
1321                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1322                 return RVAL_NONE | RVAL_STR;
1323         }
1324         return 0;
1325 #elif defined(POWERPC)
1326         long esp;
1327         struct sigcontext_struct sc;
1328
1329         if (entering(tcp)) {
1330                 tcp->u_arg[0] = 0;
1331                 if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
1332                         return 0;
1333                 /* Skip dummy stack frame. */
1334 #ifdef POWERPC64
1335                 if (current_personality == 0)
1336                         esp += 128;
1337                 else
1338                         esp += 64;
1339 #else
1340                 esp += 64;
1341 #endif
1342                 if (umove(tcp, esp, &sc) < 0)
1343                         return 0;
1344                 tcp->u_arg[0] = 1;
1345                 tcp->u_arg[1] = sc.oldmask;
1346         }
1347         else {
1348                 sigset_t sigm;
1349                 long_to_sigset(tcp->u_arg[1], &sigm);
1350                 tcp->u_rval = tcp->u_error = 0;
1351                 if (tcp->u_arg[0] == 0)
1352                         return 0;
1353                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1354                 return RVAL_NONE | RVAL_STR;
1355         }
1356         return 0;
1357 #elif defined(M68K)
1358         long usp;
1359         struct sigcontext sc;
1360
1361         if (entering(tcp)) {
1362                 tcp->u_arg[0] = 0;
1363                 if (upeek(tcp, 4*PT_USP, &usp) < 0)
1364                         return 0;
1365                 if (umove(tcp, usp, &sc) < 0)
1366                         return 0;
1367                 tcp->u_arg[0] = 1;
1368                 tcp->u_arg[1] = sc.sc_mask;
1369         }
1370         else {
1371                 sigset_t sigm;
1372                 long_to_sigset(tcp->u_arg[1], &sigm);
1373                 tcp->u_rval = tcp->u_error = 0;
1374                 if (tcp->u_arg[0] == 0)
1375                         return 0;
1376                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1377                 return RVAL_NONE | RVAL_STR;
1378         }
1379         return 0;
1380 #elif defined(ALPHA)
1381         long fp;
1382         struct sigcontext_struct sc;
1383
1384         if (entering(tcp)) {
1385                 tcp->u_arg[0] = 0;
1386                 if (upeek(tcp, REG_FP, &fp) < 0)
1387                         return 0;
1388                 if (umove(tcp, fp, &sc) < 0)
1389                         return 0;
1390                 tcp->u_arg[0] = 1;
1391                 tcp->u_arg[1] = sc.sc_mask;
1392         }
1393         else {
1394                 sigset_t sigm;
1395                 long_to_sigset(tcp->u_arg[1], &sigm);
1396                 tcp->u_rval = tcp->u_error = 0;
1397                 if (tcp->u_arg[0] == 0)
1398                         return 0;
1399                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1400                 return RVAL_NONE | RVAL_STR;
1401         }
1402         return 0;
1403 #elif defined (SPARC) || defined (SPARC64)
1404         long i1;
1405         struct pt_regs regs;
1406         m_siginfo_t si;
1407
1408         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1409                 perror("sigreturn: PTRACE_GETREGS ");
1410                 return 0;
1411         }
1412         if(entering(tcp)) {
1413                 tcp->u_arg[0] = 0;
1414                 i1 = regs.u_regs[U_REG_O1];
1415                 if(umove(tcp, i1, &si) < 0) {
1416                         perror("sigreturn: umove ");
1417                         return 0;
1418                 }
1419                 tcp->u_arg[0] = 1;
1420                 tcp->u_arg[1] = si.si_mask;
1421         } else {
1422                 sigset_t sigm;
1423                 long_to_sigset(tcp->u_arg[1], &sigm);
1424                 tcp->u_rval = tcp->u_error = 0;
1425                 if(tcp->u_arg[0] == 0)
1426                         return 0;
1427                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1428                 return RVAL_NONE | RVAL_STR;
1429         }
1430         return 0;
1431 #elif defined (LINUX_MIPSN32) || defined (LINUX_MIPSN64)
1432         /* This decodes rt_sigreturn.  The 64-bit ABIs do not have
1433            sigreturn.  */
1434         long sp;
1435         struct ucontext uc;
1436
1437         if(entering(tcp)) {
1438                 tcp->u_arg[0] = 0;
1439                 if (upeek(tcp, REG_SP, &sp) < 0)
1440                         return 0;
1441                 /* There are six words followed by a 128-byte siginfo.  */
1442                 sp = sp + 6 * 4 + 128;
1443                 if (umove(tcp, sp, &uc) < 0)
1444                         return 0;
1445                 tcp->u_arg[0] = 1;
1446                 tcp->u_arg[1] = *(long *) &uc.uc_sigmask;
1447         } else {
1448                 sigset_t sigm;
1449                 long_to_sigset(tcp->u_arg[1], &sigm);
1450                 tcp->u_rval = tcp->u_error = 0;
1451                 if(tcp->u_arg[0] == 0)
1452                         return 0;
1453                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1454                 return RVAL_NONE | RVAL_STR;
1455         }
1456         return 0;
1457 #elif defined(MIPS)
1458         long sp;
1459         struct pt_regs regs;
1460         m_siginfo_t si;
1461
1462         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1463                 perror("sigreturn: PTRACE_GETREGS ");
1464                 return 0;
1465         }
1466         if(entering(tcp)) {
1467                 tcp->u_arg[0] = 0;
1468                 sp = regs.regs[29];
1469                 if (umove(tcp, sp, &si) < 0)
1470                 tcp->u_arg[0] = 1;
1471                 tcp->u_arg[1] = si.si_mask;
1472         } else {
1473                 sigset_t sigm;
1474                 long_to_sigset(tcp->u_arg[1], &sigm);
1475                 tcp->u_rval = tcp->u_error = 0;
1476                 if(tcp->u_arg[0] == 0)
1477                         return 0;
1478                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1479                 return RVAL_NONE | RVAL_STR;
1480         }
1481         return 0;
1482 #elif defined(CRISV10) || defined(CRISV32)
1483         struct sigcontext sc;
1484
1485         if (entering(tcp)) {
1486                 long regs[PT_MAX+1];
1487
1488                 tcp->u_arg[0] = 0;
1489
1490                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
1491                         perror("sigreturn: PTRACE_GETREGS");
1492                         return 0;
1493                 }
1494                 if (umove(tcp, regs[PT_USP], &sc) < 0)
1495                         return 0;
1496                 tcp->u_arg[0] = 1;
1497                 tcp->u_arg[1] = sc.oldmask;
1498         } else {
1499                 sigset_t sigm;
1500                 long_to_sigset(tcp->u_arg[1], &sigm);
1501                 tcp->u_rval = tcp->u_error = 0;
1502
1503                 if (tcp->u_arg[0] == 0)
1504                         return 0;
1505                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1506                 return RVAL_NONE | RVAL_STR;
1507         }
1508         return 0;
1509 #elif defined(TILE)
1510         struct ucontext uc;
1511         long sp;
1512
1513         /* offset of ucontext in the kernel's sigframe structure */
1514 #       define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(struct siginfo)
1515
1516         if (entering(tcp)) {
1517                 tcp->u_arg[0] = 0;
1518                 if (upeek(tcp, PTREGS_OFFSET_SP, &sp) < 0)
1519                         return 0;
1520                 if (umove(tcp, sp + SIGFRAME_UC_OFFSET, &uc) < 0)
1521                         return 0;
1522                 tcp->u_arg[0] = 1;
1523                 memcpy(tcp->u_arg + 1, &uc.uc_sigmask, sizeof(uc.uc_sigmask));
1524         }
1525         else {
1526                 sigset_t sigm;
1527
1528                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1529                 tcp->u_rval = tcp->u_error = 0;
1530                 if (tcp->u_arg[0] == 0)
1531                         return 0;
1532                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1533                 return RVAL_NONE | RVAL_STR;
1534         }
1535         return 0;
1536 #elif defined(MICROBLAZE)
1537         struct sigcontext sc;
1538
1539         /* TODO: Verify that this is correct...  */
1540         if (entering(tcp)) {
1541                 long sp;
1542
1543                 tcp->u_arg[0] = 0;
1544
1545                 /* Read r1, the stack pointer.  */
1546                 if (upeek(tcp, 1 * 4, &sp) < 0)
1547                         return 0;
1548                 if (umove(tcp, sp, &sc) < 0)
1549                         return 0;
1550                 tcp->u_arg[0] = 1;
1551                 tcp->u_arg[1] = sc.oldmask;
1552         } else {
1553                 sigset_t sigm;
1554                 long_to_sigset(tcp->u_arg[1], &sigm);
1555                 tcp->u_rval = tcp->u_error = 0;
1556                 if (tcp->u_arg[0] == 0)
1557                         return 0;
1558                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1559                 return RVAL_NONE | RVAL_STR;
1560         }
1561         return 0;
1562 #else
1563 #warning No sys_sigreturn() for this architecture
1564 #warning         (no problem, just a reminder :-)
1565         return 0;
1566 #endif
1567 }
1568
1569 int
1570 sys_siggetmask(tcp)
1571 struct tcb *tcp;
1572 {
1573         if (exiting(tcp)) {
1574                 sigset_t sigm;
1575                 long_to_sigset(tcp->u_rval, &sigm);
1576                 tcp->auxstr = sprintsigmask("mask ", &sigm, 0);
1577         }
1578         return RVAL_HEX | RVAL_STR;
1579 }
1580
1581 int
1582 sys_sigsuspend(struct tcb *tcp)
1583 {
1584         if (entering(tcp)) {
1585                 sigset_t sigm;
1586                 long_to_sigset(tcp->u_arg[2], &sigm);
1587                 printsigmask(&sigm, 0);
1588         }
1589         return 0;
1590 }
1591
1592 #endif /* LINUX */
1593
1594 #if defined(SVR4) || defined(FREEBSD)
1595
1596 int
1597 sys_sigsuspend(tcp)
1598 struct tcb *tcp;
1599 {
1600         sigset_t sigset;
1601
1602         if (entering(tcp)) {
1603                 if (umove(tcp, tcp->u_arg[0], &sigset) < 0)
1604                         tprintf("[?]");
1605                 else
1606                         printsigmask(&sigset, 0);
1607         }
1608         return 0;
1609 }
1610 #ifndef FREEBSD
1611 static const struct xlat ucontext_flags[] = {
1612         { UC_SIGMASK,   "UC_SIGMASK"    },
1613         { UC_STACK,     "UC_STACK"      },
1614         { UC_CPU,       "UC_CPU"        },
1615 #ifdef UC_FPU
1616         { UC_FPU,       "UC_FPU"        },
1617 #endif
1618 #ifdef UC_INTR
1619         { UC_INTR,      "UC_INTR"       },
1620 #endif
1621         { 0,            NULL            },
1622 };
1623 #endif /* !FREEBSD */
1624 #endif /* SVR4 || FREEBSD */
1625
1626 #if defined SVR4 || defined LINUX || defined FREEBSD
1627 #if defined LINUX && !defined SS_ONSTACK
1628 #define SS_ONSTACK      1
1629 #define SS_DISABLE      2
1630 #if __GLIBC_MINOR__ == 0
1631 typedef struct
1632 {
1633         __ptr_t ss_sp;
1634         int ss_flags;
1635         size_t ss_size;
1636 } stack_t;
1637 #endif
1638 #endif
1639 #ifdef FREEBSD
1640 #define stack_t struct sigaltstack
1641 #endif
1642
1643 static const struct xlat sigaltstack_flags[] = {
1644         { SS_ONSTACK,   "SS_ONSTACK"    },
1645         { SS_DISABLE,   "SS_DISABLE"    },
1646         { 0,            NULL            },
1647 };
1648 #endif
1649
1650 #ifdef SVR4
1651 static void
1652 printcontext(tcp, ucp)
1653 struct tcb *tcp;
1654 ucontext_t *ucp;
1655 {
1656         tprintf("{");
1657         if (!abbrev(tcp)) {
1658                 tprintf("uc_flags=");
1659                 printflags(ucontext_flags, ucp->uc_flags, "UC_???");
1660                 tprintf(", uc_link=%#lx, ", (unsigned long) ucp->uc_link);
1661         }
1662         tprintf("uc_sigmask=");
1663         printsigmask(&ucp->uc_sigmask, 0);
1664         if (!abbrev(tcp)) {
1665                 tprintf(", uc_stack={ss_sp=%#lx, ss_size=%d, ss_flags=",
1666                         (unsigned long) ucp->uc_stack.ss_sp,
1667                         ucp->uc_stack.ss_size);
1668                 printflags(sigaltstack_flags, ucp->uc_stack.ss_flags, "SS_???");
1669                 tprintf("}");
1670         }
1671         tprintf(", ...}");
1672 }
1673
1674 int
1675 sys_getcontext(tcp)
1676 struct tcb *tcp;
1677 {
1678         ucontext_t uc;
1679
1680         if (exiting(tcp)) {
1681                 if (tcp->u_error)
1682                         tprintf("%#lx", tcp->u_arg[0]);
1683                 else if (!tcp->u_arg[0])
1684                         tprintf("NULL");
1685                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1686                         tprintf("{...}");
1687                 else
1688                         printcontext(tcp, &uc);
1689         }
1690         return 0;
1691 }
1692
1693 int
1694 sys_setcontext(tcp)
1695 struct tcb *tcp;
1696 {
1697         ucontext_t uc;
1698
1699         if (entering(tcp)) {
1700                 if (!tcp->u_arg[0])
1701                         tprintf("NULL");
1702                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1703                         tprintf("{...}");
1704                 else
1705                         printcontext(tcp, &uc);
1706         }
1707         else {
1708                 tcp->u_rval = tcp->u_error = 0;
1709                 if (tcp->u_arg[0] == 0)
1710                         return 0;
1711                 return RVAL_NONE;
1712         }
1713         return 0;
1714 }
1715
1716 #endif /* SVR4 */
1717
1718 #if defined(LINUX) || defined(FREEBSD)
1719
1720 static int
1721 print_stack_t(tcp, addr)
1722 struct tcb *tcp;
1723 unsigned long addr;
1724 {
1725         stack_t ss;
1726         if (umove(tcp, addr, &ss) < 0)
1727                 return -1;
1728         tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1729         printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1730         tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1731         return 0;
1732 }
1733
1734 int
1735 sys_sigaltstack(tcp)
1736         struct tcb *tcp;
1737 {
1738         if (entering(tcp)) {
1739                 if (tcp->u_arg[0] == 0)
1740                         tprintf("NULL");
1741                 else if (print_stack_t(tcp, tcp->u_arg[0]) < 0)
1742                         return -1;
1743         }
1744         else {
1745                 tprintf(", ");
1746                 if (tcp->u_arg[1] == 0)
1747                         tprintf("NULL");
1748                 else if (print_stack_t(tcp, tcp->u_arg[1]) < 0)
1749                         return -1;
1750         }
1751         return 0;
1752 }
1753 #endif
1754
1755 #ifdef HAVE_SIGACTION
1756
1757 int
1758 sys_sigprocmask(tcp)
1759 struct tcb *tcp;
1760 {
1761 #ifdef ALPHA
1762         if (entering(tcp)) {
1763                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1764                 tprintf(", ");
1765                 printsigmask(tcp->u_arg[1], 0);
1766         }
1767         else if (!syserror(tcp)) {
1768                 tcp->auxstr = sprintsigmask("old mask ", tcp->u_rval, 0);
1769                 return RVAL_HEX | RVAL_STR;
1770         }
1771 #else /* !ALPHA */
1772         if (entering(tcp)) {
1773 #ifdef SVR4
1774                 if (tcp->u_arg[0] == 0)
1775                         tprintf("0");
1776                 else
1777 #endif /* SVR4 */
1778                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1779                 tprintf(", ");
1780                 print_sigset(tcp, tcp->u_arg[1], 0);
1781                 tprintf(", ");
1782         }
1783         else {
1784                 if (!tcp->u_arg[2])
1785                         tprintf("NULL");
1786                 else if (syserror(tcp))
1787                         tprintf("%#lx", tcp->u_arg[2]);
1788                 else
1789                         print_sigset(tcp, tcp->u_arg[2], 0);
1790         }
1791 #endif /* !ALPHA */
1792         return 0;
1793 }
1794
1795 #endif /* HAVE_SIGACTION */
1796
1797 int
1798 sys_kill(tcp)
1799 struct tcb *tcp;
1800 {
1801         if (entering(tcp)) {
1802                 /*
1803                  * Sign-extend a 32-bit value when that's what it is.
1804                  */
1805                 long pid = tcp->u_arg[0];
1806                 if (personality_wordsize[current_personality] < sizeof pid)
1807                         pid = (long) (int) pid;
1808                 tprintf("%ld, %s", pid, signame(tcp->u_arg[1]));
1809         }
1810         return 0;
1811 }
1812
1813 #if defined(FREEBSD) || defined(SUNOS4)
1814 int
1815 sys_killpg(tcp)
1816 struct tcb *tcp;
1817 {
1818         return sys_kill(tcp);
1819 }
1820 #endif /* FREEBSD || SUNOS4 */
1821
1822 #ifdef LINUX
1823 int
1824 sys_tgkill(tcp)
1825         struct tcb *tcp;
1826 {
1827         if (entering(tcp)) {
1828                 tprintf("%ld, %ld, %s",
1829                         tcp->u_arg[0], tcp->u_arg[1], signame(tcp->u_arg[2]));
1830         }
1831         return 0;
1832 }
1833 #endif
1834
1835 int
1836 sys_sigpending(tcp)
1837 struct tcb *tcp;
1838 {
1839         sigset_t sigset;
1840
1841         if (exiting(tcp)) {
1842                 if (syserror(tcp))
1843                         tprintf("%#lx", tcp->u_arg[0]);
1844                 else if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1845                         tprintf("[?]");
1846                 else
1847                         printsigmask(&sigset, 0);
1848         }
1849         return 0;
1850 }
1851
1852 #ifdef SVR4
1853 int sys_sigwait(tcp)
1854 struct tcb *tcp;
1855 {
1856         sigset_t sigset;
1857
1858         if (entering(tcp)) {
1859                 if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1860                         tprintf("[?]");
1861                 else
1862                         printsigmask(&sigset, 0);
1863         }
1864         else {
1865                 if (!syserror(tcp)) {
1866                         tcp->auxstr = signalent[tcp->u_rval];
1867                         return RVAL_DECIMAL | RVAL_STR;
1868                 }
1869         }
1870         return 0;
1871 }
1872 #endif /* SVR4 */
1873
1874 #ifdef LINUX
1875
1876         int
1877 sys_rt_sigprocmask(tcp)
1878         struct tcb *tcp;
1879 {
1880         sigset_t sigset;
1881
1882         /* Note: arg[3] is the length of the sigset. */
1883         if (entering(tcp)) {
1884                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1885                 tprintf(", ");
1886                 if (!tcp->u_arg[1])
1887                         tprintf("NULL, ");
1888                 else if (copy_sigset_len(tcp, tcp->u_arg[1], &sigset, tcp->u_arg[3]) < 0)
1889                         tprintf("%#lx, ", tcp->u_arg[1]);
1890                 else {
1891                         printsigmask(&sigset, 1);
1892                         tprintf(", ");
1893                 }
1894         }
1895         else {
1896                 if (!tcp->u_arg[2])
1897
1898                         tprintf("NULL");
1899                 else if (syserror(tcp))
1900                         tprintf("%#lx", tcp->u_arg[2]);
1901                 else if (copy_sigset_len(tcp, tcp->u_arg[2], &sigset, tcp->u_arg[3]) < 0)
1902                         tprintf("[?]");
1903                 else
1904                         printsigmask(&sigset, 1);
1905                 tprintf(", %lu", tcp->u_arg[3]);
1906         }
1907         return 0;
1908 }
1909
1910
1911 /* Structure describing the action to be taken when a signal arrives.  */
1912 struct new_sigaction
1913 {
1914         __sighandler_t __sa_handler;
1915         unsigned long sa_flags;
1916         void (*sa_restorer) (void);
1917         /* Kernel treats sa_mask as an array of longs. */
1918         unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1919 };
1920 /* Same for i386-on-x86_64 and similar cases */
1921 struct new_sigaction32
1922 {
1923         uint32_t __sa_handler;
1924         uint32_t sa_flags;
1925         uint32_t sa_restorer;
1926         uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1927 };
1928
1929
1930 int
1931 sys_rt_sigaction(struct tcb *tcp)
1932 {
1933         struct new_sigaction sa;
1934         sigset_t sigset;
1935         long addr;
1936         int r;
1937
1938         if (entering(tcp)) {
1939                 printsignal(tcp->u_arg[0]);
1940                 tprintf(", ");
1941                 addr = tcp->u_arg[1];
1942         } else
1943                 addr = tcp->u_arg[2];
1944
1945         if (addr == 0) {
1946                 tprintf("NULL");
1947                 goto after_sa;
1948         }
1949         if (!verbose(tcp)) {
1950                 tprintf("%#lx", addr);
1951                 goto after_sa;
1952         }
1953 #if SUPPORTED_PERSONALITIES > 1
1954         if (personality_wordsize[current_personality] != sizeof(sa.sa_flags)
1955          && personality_wordsize[current_personality] == 4
1956         ) {
1957                 struct new_sigaction32 sa32;
1958                 r = umove(tcp, addr, &sa32);
1959                 if (r >= 0) {
1960                         memset(&sa, 0, sizeof(sa));
1961                         sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1962                         sa.sa_flags     = sa32.sa_flags;
1963                         sa.sa_restorer  = (void*)(unsigned long)sa32.sa_restorer;
1964                         /* Kernel treats sa_mask as an array of longs.
1965                          * For 32-bit process, "long" is uint32_t, thus, for example,
1966                          * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1967                          * But for (64-bit) kernel, 32th bit in sa_mask is
1968                          * 32th bit in 0th (64-bit) long!
1969                          * For little-endian, it's the same.
1970                          * For big-endian, we swap 32-bit words.
1971                          */
1972                         sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1973                 }
1974         } else
1975 #endif
1976         {
1977                 r = umove(tcp, addr, &sa);
1978         }
1979         if (r < 0) {
1980                 tprintf("{...}");
1981                 goto after_sa;
1982         }
1983         /* Architectures using function pointers, like
1984          * hppa, may need to manipulate the function pointer
1985          * to compute the result of a comparison. However,
1986          * the SA_HANDLER function pointer exists only in
1987          * the address space of the traced process, and can't
1988          * be manipulated by strace. In order to prevent the
1989          * compiler from generating code to manipulate
1990          * SA_HANDLER we cast the function pointers to long. */
1991         if ((long)sa.__sa_handler == (long)SIG_ERR)
1992                 tprintf("{SIG_ERR, ");
1993         else if ((long)sa.__sa_handler == (long)SIG_DFL)
1994                 tprintf("{SIG_DFL, ");
1995         else if ((long)sa.__sa_handler == (long)SIG_IGN)
1996                 tprintf("{SIG_IGN, ");
1997         else
1998                 tprintf("{%#lx, ", (long) sa.__sa_handler);
1999         /* Questionable code below.
2000          * Kernel won't handle sys_rt_sigaction
2001          * with wrong sigset size (just returns EINVAL)
2002          * therefore tcp->u_arg[3(4)] _must_ be NSIG / 8 here,
2003          * and we always use smaller memcpy. */
2004         sigemptyset(&sigset);
2005 #ifdef LINUXSPARC
2006         if (tcp->u_arg[4] <= sizeof(sigset))
2007                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[4]);
2008 #else
2009         if (tcp->u_arg[3] <= sizeof(sigset))
2010                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[3]);
2011 #endif
2012         else
2013                 memcpy(&sigset, &sa.sa_mask, sizeof(sigset));
2014         printsigmask(&sigset, 1);
2015         tprintf(", ");
2016         printflags(sigact_flags, sa.sa_flags, "SA_???");
2017 #ifdef SA_RESTORER
2018         if (sa.sa_flags & SA_RESTORER)
2019                 tprintf(", %p", sa.sa_restorer);
2020 #endif
2021         tprintf("}");
2022
2023  after_sa:
2024         if (entering(tcp))
2025                 tprintf(", ");
2026         else
2027 #ifdef LINUXSPARC
2028                 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
2029 #elif defined(ALPHA)
2030                 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
2031 #else
2032                 tprintf(", %lu", tcp->u_arg[3]);
2033 #endif
2034         return 0;
2035 }
2036
2037 int
2038 sys_rt_sigpending(struct tcb *tcp)
2039 {
2040         sigset_t sigset;
2041
2042         if (exiting(tcp)) {
2043                 if (syserror(tcp))
2044                         tprintf("%#lx", tcp->u_arg[0]);
2045                 else if (copy_sigset_len(tcp, tcp->u_arg[0],
2046                                          &sigset, tcp->u_arg[1]) < 0)
2047                         tprintf("[?]");
2048                 else
2049                         printsigmask(&sigset, 1);
2050         }
2051         return 0;
2052 }
2053
2054 int
2055 sys_rt_sigsuspend(struct tcb *tcp)
2056 {
2057         if (entering(tcp)) {
2058                 sigset_t sigm;
2059                 if (copy_sigset_len(tcp, tcp->u_arg[0], &sigm, tcp->u_arg[1]) < 0)
2060                         tprintf("[?]");
2061                 else
2062                         printsigmask(&sigm, 1);
2063         }
2064         return 0;
2065 }
2066
2067 int
2068 sys_rt_sigqueueinfo(struct tcb *tcp)
2069 {
2070         if (entering(tcp)) {
2071                 siginfo_t si;
2072                 tprintf("%lu, ", tcp->u_arg[0]);
2073                 printsignal(tcp->u_arg[1]);
2074                 tprintf(", ");
2075                 if (umove(tcp, tcp->u_arg[2], &si) < 0)
2076                         tprintf("%#lx", tcp->u_arg[2]);
2077                 else
2078                         printsiginfo(&si, verbose(tcp));
2079         }
2080         return 0;
2081 }
2082
2083 int sys_rt_sigtimedwait(struct tcb *tcp)
2084 {
2085         if (entering(tcp)) {
2086                 sigset_t sigset;
2087
2088                 if (copy_sigset_len(tcp, tcp->u_arg[0],
2089                                     &sigset, tcp->u_arg[3]) < 0)
2090                         tprintf("[?]");
2091                 else
2092                         printsigmask(&sigset, 1);
2093                 tprintf(", ");
2094                 /* This is the only "return" parameter, */
2095                 if (tcp->u_arg[1] != 0)
2096                         return 0;
2097                 /* ... if it's NULL, can decode all on entry */
2098                 tprintf("NULL, ");
2099         }
2100         else if (tcp->u_arg[1] != 0) {
2101                 /* syscall exit, and u_arg[1] wasn't NULL */
2102                 if (syserror(tcp))
2103                         tprintf("%#lx, ", tcp->u_arg[1]);
2104                 else {
2105                         siginfo_t si;
2106                         if (umove(tcp, tcp->u_arg[1], &si) < 0)
2107                                 tprintf("%#lx, ", tcp->u_arg[1]);
2108                         else {
2109                                 printsiginfo(&si, verbose(tcp));
2110                                 tprintf(", ");
2111                         }
2112                 }
2113         }
2114         else {
2115                 /* syscall exit, and u_arg[1] was NULL */
2116                 return 0;
2117         }
2118         print_timespec(tcp, tcp->u_arg[2]);
2119         tprintf(", %d", (int) tcp->u_arg[3]);
2120         return 0;
2121 };
2122
2123 int
2124 sys_restart_syscall(struct tcb *tcp)
2125 {
2126         if (entering(tcp))
2127                 tprintf("<... resuming interrupted call ...>");
2128         return 0;
2129 }
2130
2131 static int
2132 do_signalfd(struct tcb *tcp, int flags_arg)
2133 {
2134         if (entering(tcp)) {
2135                 printfd(tcp, tcp->u_arg[0]);
2136                 tprintf(", ");
2137                 print_sigset(tcp, tcp->u_arg[1], 1);
2138                 tprintf(", %lu", tcp->u_arg[2]);
2139                 if (flags_arg >= 0) {
2140                         tprintf(", ");
2141                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
2142                 }
2143         }
2144         return 0;
2145 }
2146
2147 int
2148 sys_signalfd(struct tcb *tcp)
2149 {
2150         return do_signalfd(tcp, -1);
2151 }
2152
2153 int
2154 sys_signalfd4(struct tcb *tcp)
2155 {
2156         return do_signalfd(tcp, 3);
2157 }
2158 #endif /* LINUX */