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(struct tcb *tcp, long addr, sigset_t *s, int len)
 292 {
 293         if (len > sizeof(*s))
 294                 len = sizeof(*s);
 295         sigemptyset(s);
 296         if (umoven(tcp, addr, len, (char *)s) < 0)
 297                 return -1;
 298         return 0;
 299 }
 300
 301 #ifdef LINUX
 302 /* Original sigset is unsigned long */
 303 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(long))
 304 #else
 305 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(sigset_t))
 306 #endif
 307
 308 static const char *
 309 sprintsigmask(const char *str, sigset_t *mask, int rt)
 310 /* set might include realtime sigs */
 311 {
 312         int i, nsigs;
 313         int maxsigs;
 314         const char *format;
 315         char *s;
 316         static char outstr[8 * sizeof(sigset_t) * 8];
 317
 318         strcpy(outstr, str);
 319         s = outstr + strlen(outstr);
 320         nsigs = 0;
 321         maxsigs = nsignals;
 322 #ifdef __SIGRTMAX
 323         if (rt)
 324                 maxsigs = __SIGRTMAX; /* instead */
 325 #endif
 326         for (i = 1; i < maxsigs; i++) {
 327                 if (sigismember(mask, i) == 1)
 328                         nsigs++;
 329         }
 330         if (nsigs >= nsignals * 2 / 3) {
 331                 *s++ = '~';
 332                 for (i = 1; i < maxsigs; i++) {
 333                         switch (sigismember(mask, i)) {
 334                         case 1:
 335                                 sigdelset(mask, i);
 336                                 break;
 337                         case 0:
 338                                 sigaddset(mask, i);
 339                                 break;
 340                         }
 341                 }
 342         }
 343         format = "%s";
 344         *s++ = '[';
 345         for (i = 1; i < maxsigs; i++) {
 346                 if (sigismember(mask, i) == 1) {
 347                         /* real-time signals on solaris don't have
 348                          * signalent entries
 349                          */
 350                         if (i < nsignals) {
 351                                 sprintf(s, format, signalent[i] + 3);
 352                         }
 353 #ifdef SIGRTMIN
 354                         else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
 355                                 char tsig[40];
 356                                 sprintf(tsig, "RT_%u", i - __SIGRTMIN);
 357                                 sprintf(s, format, tsig);
 358                         }
 359 #endif /* SIGRTMIN */
 360                         else {
 361                                 char tsig[32];
 362                                 sprintf(tsig, "%u", i);
 363                                 sprintf(s, format, tsig);
 364                         }
 365                         s += strlen(s);
 366                         format = " %s";
 367                 }
 368         }
 369         *s++ = ']';
 370         *s = '\0';
 371         return outstr;
 372 }
 373
 374 static void
 375 printsigmask(mask, rt)
 376 sigset_t *mask;
 377 int rt;
 378 {
 379         tprintf("%s", sprintsigmask("", mask, rt));
 380 }
 381
 382 void
 383 printsignal(nr)
 384 int nr;
 385 {
 386         tprintf("%s", signame(nr));
 387 }
 388
 389 void
 390 print_sigset(struct tcb *tcp, long addr, int rt)
 391 {
 392         sigset_t ss;
 393
 394         if (!addr)
 395                 tprintf("NULL");
 396         else if (copy_sigset(tcp, addr, &ss) < 0)
 397                 tprintf("%#lx", addr);
 398         else
 399                 printsigmask(&ss, rt);
 400 }
 401
 402 #ifdef LINUX
 403
 404 #ifndef ILL_ILLOPC
 405 #define ILL_ILLOPC      1       /* illegal opcode */
 406 #define ILL_ILLOPN      2       /* illegal operand */
 407 #define ILL_ILLADR      3       /* illegal addressing mode */
 408 #define ILL_ILLTRP      4       /* illegal trap */
 409 #define ILL_PRVOPC      5       /* privileged opcode */
 410 #define ILL_PRVREG      6       /* privileged register */
 411 #define ILL_COPROC      7       /* coprocessor error */
 412 #define ILL_BADSTK      8       /* internal stack error */
 413 #define FPE_INTDIV      1       /* integer divide by zero */
 414 #define FPE_INTOVF      2       /* integer overflow */
 415 #define FPE_FLTDIV      3       /* floating point divide by zero */
 416 #define FPE_FLTOVF      4       /* floating point overflow */
 417 #define FPE_FLTUND      5       /* floating point underflow */
 418 #define FPE_FLTRES      6       /* floating point inexact result */
 419 #define FPE_FLTINV      7       /* floating point invalid operation */
 420 #define FPE_FLTSUB      8       /* subscript out of range */
 421 #define SEGV_MAPERR     1       /* address not mapped to object */
 422 #define SEGV_ACCERR     2       /* invalid permissions for mapped object */
 423 #define BUS_ADRALN      1       /* invalid address alignment */
 424 #define BUS_ADRERR      2       /* non-existant physical address */
 425 #define BUS_OBJERR      3       /* object specific hardware error */
 426 #define TRAP_BRKPT      1       /* process breakpoint */
 427 #define TRAP_TRACE      2       /* process trace trap */
 428 #define CLD_EXITED      1       /* child has exited */
 429 #define CLD_KILLED      2       /* child was killed */
 430 #define CLD_DUMPED      3       /* child terminated abnormally */
 431 #define CLD_TRAPPED     4       /* traced child has trapped */
 432 #define CLD_STOPPED     5       /* child has stopped */
 433 #define CLD_CONTINUED   6       /* stopped child has continued */
 434 #define POLL_IN         1       /* data input available */
 435 #define POLL_OUT        2       /* output buffers available */
 436 #define POLL_MSG        3       /* input message available */
 437 #define POLL_ERR        4       /* i/o error */
 438 #define POLL_PRI        5       /* high priority input available */
 439 #define POLL_HUP        6       /* device disconnected */
 440 #define SI_KERNEL       0x80    /* sent by kernel */
 441 #define SI_USER         0       /* sent by kill, sigsend, raise */
 442 #define SI_QUEUE        -1      /* sent by sigqueue */
 443 #define SI_TIMER        -2      /* sent by timer expiration */
 444 #define SI_MESGQ        -3      /* sent by real time mesq state change */
 445 #define SI_ASYNCIO      -4      /* sent by AIO completion */
 446 #define SI_SIGIO        -5      /* sent by SIGIO */
 447 #define SI_TKILL        -6      /* sent by tkill */
 448 #define SI_ASYNCNL      -60     /* sent by asynch name lookup completion */
 449
 450 #define SI_FROMUSER(sip)        ((sip)->si_code <= 0)
 451
 452 #endif /* LINUX */
 453
 454 #if __GLIBC_MINOR__ < 1
 455 /* Type for data associated with a signal.  */
 456 typedef union sigval
 457 {
 458         int sival_int;
 459         void *sival_ptr;
 460 } sigval_t;
 461
 462 # define __SI_MAX_SIZE     128
 463 # define __SI_PAD_SIZE     ((__SI_MAX_SIZE / sizeof(int)) - 3)
 464
 465 typedef struct siginfo
 466 {
 467         int si_signo;               /* Signal number.  */
 468         int si_errno;               /* If non-zero, an errno value associated with
 469                                                                    this signal, as defined in <errno.h>.  */
 470         int si_code;                /* Signal code.  */
 471
 472         union
 473         {
 474                 int _pad[__SI_PAD_SIZE];
 475
 476                 /* kill().  */
 477                 struct
 478                 {
 479                         __pid_t si_pid;     /* Sending process ID.  */
 480                         __uid_t si_uid;     /* Real user ID of sending process.  */
 481                 } _kill;
 482
 483                 /* POSIX.1b timers.  */
 484                 struct
 485                 {
 486                         unsigned int _timer1;
 487                         unsigned int _timer2;
 488                 } _timer;
 489
 490                 /* POSIX.1b signals.  */
 491                 struct
 492                 {
 493                         __pid_t si_pid;     /* Sending process ID.  */
 494                         __uid_t si_uid;     /* Real user ID of sending process.  */
 495                         sigval_t si_sigval; /* Signal value.  */
 496                 } _rt;
 497
 498                 /* SIGCHLD.  */
 499                 struct
 500                 {
 501                         __pid_t si_pid;     /* Which child.  */
 502                         int si_status;      /* Exit value or signal.  */
 503                         __clock_t si_utime;
 504                         __clock_t si_stime;
 505                 } _sigchld;
 506
 507                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
 508                 struct
 509                 {
 510                         void *si_addr;      /* Faulting insn/memory ref.  */
 511                 } _sigfault;
 512
 513                 /* SIGPOLL.  */
 514                 struct
 515                 {
 516                         int si_band;        /* Band event for SIGPOLL.  */
 517                         int si_fd;
 518                 } _sigpoll;
 519         } _sifields;
 520 } siginfo_t;
 521
 522 #define si_pid          _sifields._kill.si_pid
 523 #define si_uid          _sifields._kill.si_uid
 524 #define si_status       _sifields._sigchld.si_status
 525 #define si_utime        _sifields._sigchld.si_utime
 526 #define si_stime        _sifields._sigchld.si_stime
 527 #define si_value        _sifields._rt.si_sigval
 528 #define si_int          _sifields._rt.si_sigval.sival_int
 529 #define si_ptr          _sifields._rt.si_sigval.sival_ptr
 530 #define si_addr         _sifields._sigfault.si_addr
 531 #define si_band         _sifields._sigpoll.si_band
 532 #define si_fd           _sifields._sigpoll.si_fd
 533
 534 #endif
 535
 536 #endif
 537
 538 #if defined (SVR4) || defined (LINUX)
 539
 540 static const struct xlat siginfo_codes[] = {
 541 #ifdef SI_KERNEL
 542         { SI_KERNEL,    "SI_KERNEL"     },
 543 #endif
 544 #ifdef SI_USER
 545         { SI_USER,      "SI_USER"       },
 546 #endif
 547 #ifdef SI_QUEUE
 548         { SI_QUEUE,     "SI_QUEUE"      },
 549 #endif
 550 #ifdef SI_TIMER
 551         { SI_TIMER,     "SI_TIMER"      },
 552 #endif
 553 #ifdef SI_MESGQ
 554         { SI_MESGQ,     "SI_MESGQ"      },
 555 #endif
 556 #ifdef SI_ASYNCIO
 557         { SI_ASYNCIO,   "SI_ASYNCIO"    },
 558 #endif
 559 #ifdef SI_SIGIO
 560         { SI_SIGIO,     "SI_SIGIO"      },
 561 #endif
 562 #ifdef SI_TKILL
 563         { SI_TKILL,     "SI_TKILL"      },
 564 #endif
 565 #ifdef SI_ASYNCNL
 566         { SI_ASYNCNL,   "SI_ASYNCNL"    },
 567 #endif
 568 #ifdef SI_NOINFO
 569         { SI_NOINFO,    "SI_NOINFO"     },
 570 #endif
 571 #ifdef SI_LWP
 572         { SI_LWP,       "SI_LWP"        },
 573 #endif
 574         { 0,            NULL            },
 575 };
 576
 577 static const struct xlat sigill_codes[] = {
 578         { ILL_ILLOPC,   "ILL_ILLOPC"    },
 579         { ILL_ILLOPN,   "ILL_ILLOPN"    },
 580         { ILL_ILLADR,   "ILL_ILLADR"    },
 581         { ILL_ILLTRP,   "ILL_ILLTRP"    },
 582         { ILL_PRVOPC,   "ILL_PRVOPC"    },
 583         { ILL_PRVREG,   "ILL_PRVREG"    },
 584         { ILL_COPROC,   "ILL_COPROC"    },
 585         { ILL_BADSTK,   "ILL_BADSTK"    },
 586         { 0,            NULL            },
 587 };
 588
 589 static const struct xlat sigfpe_codes[] = {
 590         { FPE_INTDIV,   "FPE_INTDIV"    },
 591         { FPE_INTOVF,   "FPE_INTOVF"    },
 592         { FPE_FLTDIV,   "FPE_FLTDIV"    },
 593         { FPE_FLTOVF,   "FPE_FLTOVF"    },
 594         { FPE_FLTUND,   "FPE_FLTUND"    },
 595         { FPE_FLTRES,   "FPE_FLTRES"    },
 596         { FPE_FLTINV,   "FPE_FLTINV"    },
 597         { FPE_FLTSUB,   "FPE_FLTSUB"    },
 598         { 0,            NULL            },
 599 };
 600
 601 static const struct xlat sigtrap_codes[] = {
 602         { TRAP_BRKPT,   "TRAP_BRKPT"    },
 603         { TRAP_TRACE,   "TRAP_TRACE"    },
 604         { 0,            NULL            },
 605 };
 606
 607 static const struct xlat sigchld_codes[] = {
 608         { CLD_EXITED,   "CLD_EXITED"    },
 609         { CLD_KILLED,   "CLD_KILLED"    },
 610         { CLD_DUMPED,   "CLD_DUMPED"    },
 611         { CLD_TRAPPED,  "CLD_TRAPPED"   },
 612         { CLD_STOPPED,  "CLD_STOPPED"   },
 613         { CLD_CONTINUED,"CLD_CONTINUED" },
 614         { 0,            NULL            },
 615 };
 616
 617 static const struct xlat sigpoll_codes[] = {
 618         { POLL_IN,      "POLL_IN"       },
 619         { POLL_OUT,     "POLL_OUT"      },
 620         { POLL_MSG,     "POLL_MSG"      },
 621         { POLL_ERR,     "POLL_ERR"      },
 622         { POLL_PRI,     "POLL_PRI"      },
 623         { POLL_HUP,     "POLL_HUP"      },
 624         { 0,            NULL            },
 625 };
 626
 627 static const struct xlat sigprof_codes[] = {
 628 #ifdef PROF_SIG
 629         { PROF_SIG,     "PROF_SIG"      },
 630 #endif
 631         { 0,            NULL            },
 632 };
 633
 634 #ifdef SIGEMT
 635 static const struct xlat sigemt_codes[] = {
 636 #ifdef EMT_TAGOVF
 637         { EMT_TAGOVF,   "EMT_TAGOVF"    },
 638 #endif
 639         { 0,            NULL            },
 640 };
 641 #endif
 642
 643 static const struct xlat sigsegv_codes[] = {
 644         { SEGV_MAPERR,  "SEGV_MAPERR"   },
 645         { SEGV_ACCERR,  "SEGV_ACCERR"   },
 646         { 0,            NULL            },
 647 };
 648
 649 static const struct xlat sigbus_codes[] = {
 650         { BUS_ADRALN,   "BUS_ADRALN"    },
 651         { BUS_ADRERR,   "BUS_ADRERR"    },
 652         { BUS_OBJERR,   "BUS_OBJERR"    },
 653         { 0,            NULL            },
 654 };
 655
 656 void
 657 printsiginfo(siginfo_t *sip, int verbose)
 658 {
 659         const char *code;
 660
 661         if (sip->si_signo == 0) {
 662                 tprintf("{}");
 663                 return;
 664         }
 665         tprintf("{si_signo=");
 666         printsignal(sip->si_signo);
 667         code = xlookup(siginfo_codes, sip->si_code);
 668         if (!code) {
 669                 switch (sip->si_signo) {
 670                 case SIGTRAP:
 671                         code = xlookup(sigtrap_codes, sip->si_code);
 672                         break;
 673                 case SIGCHLD:
 674                         code = xlookup(sigchld_codes, sip->si_code);
 675                         break;
 676                 case SIGPOLL:
 677                         code = xlookup(sigpoll_codes, sip->si_code);
 678                         break;
 679                 case SIGPROF:
 680                         code = xlookup(sigprof_codes, sip->si_code);
 681                         break;
 682                 case SIGILL:
 683                         code = xlookup(sigill_codes, sip->si_code);
 684                         break;
 685 #ifdef SIGEMT
 686                 case SIGEMT:
 687                         code = xlookup(sigemt_codes, sip->si_code);
 688                         break;
 689 #endif
 690                 case SIGFPE:
 691                         code = xlookup(sigfpe_codes, sip->si_code);
 692                         break;
 693                 case SIGSEGV:
 694                         code = xlookup(sigsegv_codes, sip->si_code);
 695                         break;
 696                 case SIGBUS:
 697                         code = xlookup(sigbus_codes, sip->si_code);
 698                         break;
 699                 }
 700         }
 701         if (code)
 702                 tprintf(", si_code=%s", code);
 703         else
 704                 tprintf(", si_code=%#x", sip->si_code);
 705 #ifdef SI_NOINFO
 706         if (sip->si_code != SI_NOINFO)
 707 #endif
 708         {
 709                 if (sip->si_errno) {
 710                         if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
 711                                 tprintf(", si_errno=%d", sip->si_errno);
 712                         else
 713                                 tprintf(", si_errno=%s",
 714                                         errnoent[sip->si_errno]);
 715                 }
 716 #ifdef SI_FROMUSER
 717                 if (SI_FROMUSER(sip)) {
 718                         tprintf(", si_pid=%lu, si_uid=%lu",
 719                                 (unsigned long) sip->si_pid,
 720                                 (unsigned long) sip->si_uid);
 721                         switch (sip->si_code) {
 722 #ifdef SI_USER
 723                         case SI_USER:
 724                                 break;
 725 #endif
 726 #ifdef SI_TKILL
 727                         case SI_TKILL:
 728                                 break;
 729 #endif
 730 #ifdef SI_TIMER
 731                         case SI_TIMER:
 732                                 tprintf(", si_value=%d", sip->si_int);
 733                                 break;
 734 #endif
 735 #ifdef LINUX
 736                         default:
 737                                 if (!sip->si_ptr)
 738                                         break;
 739                                 if (!verbose)
 740                                         tprintf(", ...");
 741                                 else
 742                                         tprintf(", si_value={int=%u, ptr=%#lx}",
 743                                                 sip->si_int,
 744                                                 (unsigned long) sip->si_ptr);
 745                                 break;
 746 #endif
 747                         }
 748                 }
 749                 else
 750 #endif /* SI_FROMUSER */
 751                 {
 752                         switch (sip->si_signo) {
 753                         case SIGCHLD:
 754                                 tprintf(", si_pid=%ld, si_status=",
 755                                         (long) sip->si_pid);
 756                                 if (sip->si_code == CLD_EXITED)
 757                                         tprintf("%d", sip->si_status);
 758                                 else
 759                                         printsignal(sip->si_status);
 760 #if LINUX
 761                                 if (!verbose)
 762                                         tprintf(", ...");
 763                                 else
 764                                         tprintf(", si_utime=%lu, si_stime=%lu",
 765                                                 sip->si_utime,
 766                                                 sip->si_stime);
 767 #endif
 768                                 break;
 769                         case SIGILL: case SIGFPE:
 770                         case SIGSEGV: case SIGBUS:
 771                                 tprintf(", si_addr=%#lx",
 772                                         (unsigned long) sip->si_addr);
 773                                 break;
 774                         case SIGPOLL:
 775                                 switch (sip->si_code) {
 776                                 case POLL_IN: case POLL_OUT: case POLL_MSG:
 777                                         tprintf(", si_band=%ld",
 778                                                 (long) sip->si_band);
 779                                         break;
 780                                 }
 781                                 break;
 782 #ifdef LINUX
 783                         default:
 784                                 if (sip->si_pid || sip->si_uid)
 785                                         tprintf(", si_pid=%lu, si_uid=%lu",
 786                                                 (unsigned long) sip->si_pid,
 787                                                 (unsigned long) sip->si_uid);
 788                                 if (!sip->si_ptr)
 789                                         break;
 790                                 if (!verbose)
 791                                         tprintf(", ...");
 792                                 else {
 793                                         tprintf(", si_value={int=%u, ptr=%#lx}",
 794                                                 sip->si_int,
 795                                                 (unsigned long) sip->si_ptr);
 796                                 }
 797 #endif
 798
 799                         }
 800                 }
 801         }
 802         tprintf("}");
 803 }
 804
 805 #endif /* SVR4 || LINUX */
 806
 807 #ifdef LINUX
 808
 809 static void
 810 parse_sigset_t(const char *str, sigset_t *set)
 811 {
 812         const char *p;
 813         unsigned int digit;
 814         int i;
 815
 816         sigemptyset(set);
 817
 818         p = strchr(str, '\n');
 819         if (p == NULL)
 820                 p = strchr(str, '\0');
 821         for (i = 0; p-- > str; i += 4) {
 822                 if (*p >= '0' && *p <= '9')
 823                         digit = *p - '0';
 824                 else if (*p >= 'a' && *p <= 'f')
 825                         digit = *p - 'a' + 10;
 826                 else if (*p >= 'A' && *p <= 'F')
 827                         digit = *p - 'A' + 10;
 828                 else
 829                         break;
 830                 if (digit & 1)
 831                         sigaddset(set, i + 1);
 832                 if (digit & 2)
 833                         sigaddset(set, i + 2);
 834                 if (digit & 4)
 835                         sigaddset(set, i + 3);
 836                 if (digit & 8)
 837                         sigaddset(set, i + 4);
 838         }
 839 }
 840
 841 #endif
 842
 843 /*
 844  * Check process TCP for the disposition of signal SIG.
 845  * Return 1 if the process would somehow manage to  survive signal SIG,
 846  * else return 0.  This routine will never be called with SIGKILL.
 847  */
 848 int
 849 sigishandled(struct tcb *tcp, int sig)
 850 {
 851 #ifdef LINUX
 852         int sfd;
 853         char sname[32];
 854         char buf[2048];
 855         const char *s;
 856         int i;
 857         sigset_t ignored, caught;
 858 #endif
 859 #ifdef SVR4
 860         /*
 861          * Since procfs doesn't interfere with wait I think it is safe
 862          * to punt on this question.  If not, the information is there.
 863          */
 864         return 1;
 865 #else /* !SVR4 */
 866         switch (sig) {
 867         case SIGCONT:
 868         case SIGSTOP:
 869         case SIGTSTP:
 870         case SIGTTIN:
 871         case SIGTTOU:
 872         case SIGCHLD:
 873         case SIGIO:
 874 #if defined(SIGURG) && SIGURG != SIGIO
 875         case SIGURG:
 876 #endif
 877         case SIGWINCH:
 878                 /* Gloria Gaynor says ... */
 879                 return 1;
 880         default:
 881                 break;
 882         }
 883 #endif /* !SVR4 */
 884 #ifdef LINUX
 885
 886         /* This is incredibly costly but it's worth it. */
 887         /* NOTE: LinuxThreads internally uses SIGRTMIN, SIGRTMIN + 1 and
 888            SIGRTMIN + 2, so we can't use the obsolete /proc/%d/stat which
 889            doesn't handle real-time signals). */
 890         sprintf(sname, "/proc/%d/status", tcp->pid);
 891         if ((sfd = open(sname, O_RDONLY)) == -1) {
 892                 perror(sname);
 893                 return 1;
 894         }
 895         i = read(sfd, buf, sizeof(buf));
 896         buf[i] = '\0';
 897         close(sfd);
 898         /*
 899          * Skip the extraneous fields. We need to skip
 900          * command name has any spaces in it.  So be it.
 901          */
 902         s = strstr(buf, "SigIgn:\t");
 903         if (!s)
 904         {
 905                 fprintf(stderr, "/proc/pid/status format error\n");
 906                 return 1;
 907         }
 908         parse_sigset_t(s + 8, &ignored);
 909
 910         s = strstr(buf, "SigCgt:\t");
 911         if (!s)
 912         {
 913                 fprintf(stderr, "/proc/pid/status format error\n");
 914                 return 1;
 915         }
 916         parse_sigset_t(s + 8, &caught);
 917
 918 #ifdef DEBUG
 919         fprintf(stderr, "sigs: %016qx %016qx (sig=%d)\n",
 920                 *(long long *) &ignored, *(long long *) &caught, sig);
 921 #endif
 922         if (sigismember(&ignored, sig) || sigismember(&caught, sig))
 923                 return 1;
 924 #endif /* LINUX */
 925
 926 #ifdef SUNOS4
 927         void (*u_signal)();
 928
 929         if (upeek(tcp, uoff(u_signal[0]) + sig*sizeof(u_signal),
 930             (long *) &u_signal) < 0) {
 931                 return 0;
 932         }
 933         if (u_signal != SIG_DFL)
 934                 return 1;
 935 #endif /* SUNOS4 */
 936
 937         return 0;
 938 }
 939
 940 #if defined(SUNOS4) || defined(FREEBSD)
 941
 942 int
 943 sys_sigvec(struct tcb *tcp)
 944 {
 945         struct sigvec sv;
 946         long addr;
 947
 948         if (entering(tcp)) {
 949                 printsignal(tcp->u_arg[0]);
 950                 tprintf(", ");
 951                 addr = tcp->u_arg[1];
 952         } else {
 953                 addr = tcp->u_arg[2];
 954         }
 955         if (addr == 0)
 956                 tprintf("NULL");
 957         else if (!verbose(tcp))
 958                 tprintf("%#lx", addr);
 959         else if (umove(tcp, addr, &sv) < 0)
 960                 tprintf("{...}");
 961         else {
 962                 switch ((int) sv.sv_handler) {
 963                 case (int) SIG_ERR:
 964                         tprintf("{SIG_ERR}");
 965                         break;
 966                 case (int) SIG_DFL:
 967                         tprintf("{SIG_DFL}");
 968                         break;
 969                 case (int) SIG_IGN:
 970                         if (tcp->u_arg[0] == SIGTRAP) {
 971                                 tcp->flags |= TCB_SIGTRAPPED;
 972                                 kill(tcp->pid, SIGSTOP);
 973                         }
 974                         tprintf("{SIG_IGN}");
 975                         break;
 976                 case (int) SIG_HOLD:
 977                         if (tcp->u_arg[0] == SIGTRAP) {
 978                                 tcp->flags |= TCB_SIGTRAPPED;
 979                                 kill(tcp->pid, SIGSTOP);
 980                         }
 981                         tprintf("SIG_HOLD");
 982                         break;
 983                 default:
 984                         if (tcp->u_arg[0] == SIGTRAP) {
 985                                 tcp->flags |= TCB_SIGTRAPPED;
 986                                 kill(tcp->pid, SIGSTOP);
 987                         }
 988                         tprintf("{%#lx, ", (unsigned long) sv.sv_handler);
 989                         printsigmask(&sv.sv_mask, 0);
 990                         tprintf(", ");
 991                         printflags(sigvec_flags, sv.sv_flags, "SV_???");
 992                         tprintf("}");
 993                 }
 994         }
 995         if (entering(tcp))
 996                 tprintf(", ");
 997         return 0;
 998 }
 999
1000 int
1001 sys_sigpause(struct tcb *tcp)
1002 {
1003         if (entering(tcp)) {    /* WTA: UD had a bug here: he forgot the braces */
1004                 sigset_t sigm;
1005                 long_to_sigset(tcp->u_arg[0], &sigm);
1006                 printsigmask(&sigm, 0);
1007         }
1008         return 0;
1009 }
1010
1011 int
1012 sys_sigstack(struct tcb *tcp)
1013 {
1014         struct sigstack ss;
1015         long addr;
1016
1017         if (entering(tcp))
1018                 addr = tcp->u_arg[0];
1019         else
1020                 addr = tcp->u_arg[1];
1021         if (addr == 0)
1022                 tprintf("NULL");
1023         else if (umove(tcp, addr, &ss) < 0)
1024                 tprintf("%#lx", addr);
1025         else {
1026                 tprintf("{ss_sp %#lx ", (unsigned long) ss.ss_sp);
1027                 tprintf("ss_onstack %s}", ss.ss_onstack ? "YES" : "NO");
1028         }
1029         if (entering(tcp))
1030                 tprintf(", ");
1031         return 0;
1032 }
1033
1034 int
1035 sys_sigcleanup(struct tcb *tcp)
1036 {
1037         return 0;
1038 }
1039
1040 #endif /* SUNOS4 || FREEBSD */
1041
1042 #ifndef SVR4
1043
1044 int
1045 sys_sigsetmask(struct tcb *tcp)
1046 {
1047         if (entering(tcp)) {
1048                 sigset_t sigm;
1049                 long_to_sigset(tcp->u_arg[0], &sigm);
1050                 printsigmask(&sigm, 0);
1051 #ifndef USE_PROCFS
1052                 if ((tcp->u_arg[0] & sigmask(SIGTRAP))) {
1053                         /* Mark attempt to block SIGTRAP */
1054                         tcp->flags |= TCB_SIGTRAPPED;
1055                         /* Send unblockable signal */
1056                         kill(tcp->pid, SIGSTOP);
1057                 }
1058 #endif /* !USE_PROCFS */
1059         }
1060         else if (!syserror(tcp)) {
1061                 sigset_t sigm;
1062                 long_to_sigset(tcp->u_rval, &sigm);
1063                 tcp->auxstr = sprintsigmask("old mask ", &sigm, 0);
1064
1065                 return RVAL_HEX | RVAL_STR;
1066         }
1067         return 0;
1068 }
1069
1070 #if defined(SUNOS4) || defined(FREEBSD)
1071 int
1072 sys_sigblock(struct tcb *tcp)
1073 {
1074         return sys_sigsetmask(tcp);
1075 }
1076 #endif /* SUNOS4 || FREEBSD */
1077
1078 #endif /* !SVR4 */
1079
1080 #ifdef HAVE_SIGACTION
1081
1082 #ifdef LINUX
1083 struct old_sigaction {
1084         __sighandler_t __sa_handler;
1085         unsigned long sa_mask;
1086         unsigned long sa_flags;
1087         void (*sa_restorer)(void);
1088 };
1089 #define SA_HANDLER __sa_handler
1090 #endif /* LINUX */
1091
1092 #ifndef SA_HANDLER
1093 #define SA_HANDLER sa_handler
1094 #endif
1095
1096 int
1097 sys_sigaction(struct tcb *tcp)
1098 {
1099         long addr;
1100 #ifdef LINUX
1101         sigset_t sigset;
1102         struct old_sigaction sa;
1103 #else
1104         struct sigaction sa;
1105 #endif
1106
1107
1108         if (entering(tcp)) {
1109                 printsignal(tcp->u_arg[0]);
1110                 tprintf(", ");
1111                 addr = tcp->u_arg[1];
1112         } else
1113                 addr = tcp->u_arg[2];
1114         if (addr == 0)
1115                 tprintf("NULL");
1116         else if (!verbose(tcp))
1117                 tprintf("%#lx", addr);
1118         else if (umove(tcp, addr, &sa) < 0)
1119                 tprintf("{...}");
1120         else {
1121                 /* Architectures using function pointers, like
1122                  * hppa, may need to manipulate the function pointer
1123                  * to compute the result of a comparison. However,
1124                  * the SA_HANDLER function pointer exists only in
1125                  * the address space of the traced process, and can't
1126                  * be manipulated by strace. In order to prevent the
1127                  * compiler from generating code to manipulate
1128                  * SA_HANDLER we cast the function pointers to long. */
1129                 if ((long)sa.SA_HANDLER == (long)SIG_ERR)
1130                         tprintf("{SIG_ERR, ");
1131                 else if ((long)sa.SA_HANDLER == (long)SIG_DFL)
1132                         tprintf("{SIG_DFL, ");
1133                 else if ((long)sa.SA_HANDLER == (long)SIG_IGN) {
1134 #ifndef USE_PROCFS
1135                         if (tcp->u_arg[0] == SIGTRAP) {
1136                                 tcp->flags |= TCB_SIGTRAPPED;
1137                                 kill(tcp->pid, SIGSTOP);
1138                         }
1139 #endif /* !USE_PROCFS */
1140                         tprintf("{SIG_IGN, ");
1141                 }
1142                 else {
1143 #ifndef USE_PROCFS
1144                         if (tcp->u_arg[0] == SIGTRAP) {
1145                                 tcp->flags |= TCB_SIGTRAPPED;
1146                                 kill(tcp->pid, SIGSTOP);
1147                         }
1148 #endif /* !USE_PROCFS */
1149                         tprintf("{%#lx, ", (long) sa.SA_HANDLER);
1150 #ifndef LINUX
1151                         printsigmask(&sa.sa_mask, 0);
1152 #else
1153                         long_to_sigset(sa.sa_mask, &sigset);
1154                         printsigmask(&sigset, 0);
1155 #endif
1156                         tprintf(", ");
1157                         printflags(sigact_flags, sa.sa_flags, "SA_???");
1158 #ifdef SA_RESTORER
1159                         if (sa.sa_flags & SA_RESTORER)
1160                                 tprintf(", %p", sa.sa_restorer);
1161 #endif
1162                         tprintf("}");
1163                 }
1164         }
1165         if (entering(tcp))
1166                 tprintf(", ");
1167 #ifdef LINUX
1168         else
1169                 tprintf(", %#lx", (unsigned long) sa.sa_restorer);
1170 #endif
1171         return 0;
1172 }
1173
1174 int
1175 sys_signal(struct tcb *tcp)
1176 {
1177         if (entering(tcp)) {
1178                 printsignal(tcp->u_arg[0]);
1179                 tprintf(", ");
1180                 switch (tcp->u_arg[1]) {
1181                 case (long) SIG_ERR:
1182                         tprintf("SIG_ERR");
1183                         break;
1184                 case (long) SIG_DFL:
1185                         tprintf("SIG_DFL");
1186                         break;
1187                 case (long) SIG_IGN:
1188 #ifndef USE_PROCFS
1189                         if (tcp->u_arg[0] == SIGTRAP) {
1190                                 tcp->flags |= TCB_SIGTRAPPED;
1191                                 kill(tcp->pid, SIGSTOP);
1192                         }
1193 #endif /* !USE_PROCFS */
1194                         tprintf("SIG_IGN");
1195                         break;
1196                 default:
1197 #ifndef USE_PROCFS
1198                         if (tcp->u_arg[0] == SIGTRAP) {
1199                                 tcp->flags |= TCB_SIGTRAPPED;
1200                                 kill(tcp->pid, SIGSTOP);
1201                         }
1202 #endif /* !USE_PROCFS */
1203                         tprintf("%#lx", tcp->u_arg[1]);
1204                 }
1205                 return 0;
1206         }
1207         else if (!syserror(tcp)) {
1208                 switch (tcp->u_rval) {
1209                     case (long) SIG_ERR:
1210                         tcp->auxstr = "SIG_ERR"; break;
1211                     case (long) SIG_DFL:
1212                         tcp->auxstr = "SIG_DFL"; break;
1213                     case (long) SIG_IGN:
1214                         tcp->auxstr = "SIG_IGN"; break;
1215                     default:
1216                         tcp->auxstr = NULL;
1217                 }
1218                 return RVAL_HEX | RVAL_STR;
1219         }
1220         return 0;
1221 }
1222
1223 #ifdef SVR4
1224 int
1225 sys_sighold(struct tcb *tcp)
1226 {
1227         if (entering(tcp)) {
1228                 printsignal(tcp->u_arg[0]);
1229         }
1230         return 0;
1231 }
1232 #endif /* SVR4 */
1233
1234 #endif /* HAVE_SIGACTION */
1235
1236 #ifdef LINUX
1237
1238 int
1239 sys_sigreturn(struct tcb *tcp)
1240 {
1241 #if defined(ARM)
1242         struct pt_regs regs;
1243         struct sigcontext_struct sc;
1244
1245         if (entering(tcp)) {
1246                 tcp->u_arg[0] = 0;
1247
1248                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)&regs) == -1)
1249                         return 0;
1250
1251                 if (umove(tcp, regs.ARM_sp, &sc) < 0)
1252                         return 0;
1253
1254                 tcp->u_arg[0] = 1;
1255                 tcp->u_arg[1] = sc.oldmask;
1256         } else {
1257                 sigset_t sigm;
1258                 long_to_sigset(tcp->u_arg[1], &sigm);
1259                 tcp->u_rval = tcp->u_error = 0;
1260                 if (tcp->u_arg[0] == 0)
1261                         return 0;
1262                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1263                 return RVAL_NONE | RVAL_STR;
1264         }
1265         return 0;
1266 #elif defined(S390) || defined(S390X)
1267         long usp;
1268         struct sigcontext_struct sc;
1269
1270         if (entering(tcp)) {
1271                 tcp->u_arg[0] = 0;
1272                 if (upeek(tcp, PT_GPR15, &usp) < 0)
1273                         return 0;
1274                 if (umove(tcp, usp+__SIGNAL_FRAMESIZE, &sc) < 0)
1275                         return 0;
1276                 tcp->u_arg[0] = 1;
1277                 memcpy(&tcp->u_arg[1], &sc.oldmask[0], sizeof(sigset_t));
1278         } else {
1279                 tcp->u_rval = tcp->u_error = 0;
1280                 if (tcp->u_arg[0] == 0)
1281                         return 0;
1282                 tcp->auxstr = sprintsigmask("mask now ", (sigset_t *)&tcp->u_arg[1], 0);
1283                 return RVAL_NONE | RVAL_STR;
1284         }
1285         return 0;
1286 #elif defined(I386)
1287         long esp;
1288         struct sigcontext_struct sc;
1289
1290         if (entering(tcp)) {
1291                 tcp->u_arg[0] = 0;
1292                 if (upeek(tcp, 4*UESP, &esp) < 0)
1293                         return 0;
1294                 if (umove(tcp, esp, &sc) < 0)
1295                         return 0;
1296                 tcp->u_arg[0] = 1;
1297                 tcp->u_arg[1] = sc.oldmask;
1298         }
1299         else {
1300                 sigset_t sigm;
1301                 long_to_sigset(tcp->u_arg[1], &sigm);
1302                 tcp->u_rval = tcp->u_error = 0;
1303                 if (tcp->u_arg[0] == 0)
1304                         return 0;
1305                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1306                 return RVAL_NONE | RVAL_STR;
1307         }
1308         return 0;
1309 #elif defined(IA64)
1310         struct sigcontext sc;
1311         long sp;
1312
1313         if (entering(tcp)) {
1314                 /* offset of sigcontext in the kernel's sigframe structure: */
1315 #               define SIGFRAME_SC_OFFSET       0x90
1316                 tcp->u_arg[0] = 0;
1317                 if (upeek(tcp, PT_R12, &sp) < 0)
1318                         return 0;
1319                 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
1320                         return 0;
1321                 tcp->u_arg[0] = 1;
1322                 memcpy(tcp->u_arg + 1, &sc.sc_mask, sizeof(sc.sc_mask));
1323         }
1324         else {
1325                 sigset_t sigm;
1326
1327                 memcpy(&sigm, tcp->u_arg + 1, sizeof(sigm));
1328                 tcp->u_rval = tcp->u_error = 0;
1329                 if (tcp->u_arg[0] == 0)
1330                         return 0;
1331                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1332                 return RVAL_NONE | RVAL_STR;
1333         }
1334         return 0;
1335 #elif defined(POWERPC)
1336         long esp;
1337         struct sigcontext_struct sc;
1338
1339         if (entering(tcp)) {
1340                 tcp->u_arg[0] = 0;
1341                 if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
1342                         return 0;
1343                 /* Skip dummy stack frame. */
1344 #ifdef POWERPC64
1345                 if (current_personality == 0)
1346                         esp += 128;
1347                 else
1348                         esp += 64;
1349 #else
1350                 esp += 64;
1351 #endif
1352                 if (umove(tcp, esp, &sc) < 0)
1353                         return 0;
1354                 tcp->u_arg[0] = 1;
1355                 tcp->u_arg[1] = sc.oldmask;
1356         }
1357         else {
1358                 sigset_t sigm;
1359                 long_to_sigset(tcp->u_arg[1], &sigm);
1360                 tcp->u_rval = tcp->u_error = 0;
1361                 if (tcp->u_arg[0] == 0)
1362                         return 0;
1363                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1364                 return RVAL_NONE | RVAL_STR;
1365         }
1366         return 0;
1367 #elif defined(M68K)
1368         long usp;
1369         struct sigcontext sc;
1370
1371         if (entering(tcp)) {
1372                 tcp->u_arg[0] = 0;
1373                 if (upeek(tcp, 4*PT_USP, &usp) < 0)
1374                         return 0;
1375                 if (umove(tcp, usp, &sc) < 0)
1376                         return 0;
1377                 tcp->u_arg[0] = 1;
1378                 tcp->u_arg[1] = sc.sc_mask;
1379         }
1380         else {
1381                 sigset_t sigm;
1382                 long_to_sigset(tcp->u_arg[1], &sigm);
1383                 tcp->u_rval = tcp->u_error = 0;
1384                 if (tcp->u_arg[0] == 0)
1385                         return 0;
1386                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1387                 return RVAL_NONE | RVAL_STR;
1388         }
1389         return 0;
1390 #elif defined(ALPHA)
1391         long fp;
1392         struct sigcontext_struct sc;
1393
1394         if (entering(tcp)) {
1395                 tcp->u_arg[0] = 0;
1396                 if (upeek(tcp, REG_FP, &fp) < 0)
1397                         return 0;
1398                 if (umove(tcp, fp, &sc) < 0)
1399                         return 0;
1400                 tcp->u_arg[0] = 1;
1401                 tcp->u_arg[1] = sc.sc_mask;
1402         }
1403         else {
1404                 sigset_t sigm;
1405                 long_to_sigset(tcp->u_arg[1], &sigm);
1406                 tcp->u_rval = tcp->u_error = 0;
1407                 if (tcp->u_arg[0] == 0)
1408                         return 0;
1409                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1410                 return RVAL_NONE | RVAL_STR;
1411         }
1412         return 0;
1413 #elif defined (SPARC) || defined (SPARC64)
1414         long i1;
1415         struct pt_regs regs;
1416         m_siginfo_t si;
1417
1418         if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1419                 perror("sigreturn: PTRACE_GETREGS ");
1420                 return 0;
1421         }
1422         if (entering(tcp)) {
1423                 tcp->u_arg[0] = 0;
1424                 i1 = regs.u_regs[U_REG_O1];
1425                 if (umove(tcp, i1, &si) < 0) {
1426                         perror("sigreturn: umove ");
1427                         return 0;
1428                 }
1429                 tcp->u_arg[0] = 1;
1430                 tcp->u_arg[1] = si.si_mask;
1431         } else {
1432                 sigset_t sigm;
1433                 long_to_sigset(tcp->u_arg[1], &sigm);
1434                 tcp->u_rval = tcp->u_error = 0;
1435                 if (tcp->u_arg[0] == 0)
1436                         return 0;
1437                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1438                 return RVAL_NONE | RVAL_STR;
1439         }
1440         return 0;
1441 #elif defined (LINUX_MIPSN32) || defined (LINUX_MIPSN64)
1442         /* This decodes rt_sigreturn.  The 64-bit ABIs do not have
1443            sigreturn.  */
1444         long sp;
1445         struct ucontext uc;
1446
1447         if (entering(tcp)) {
1448                 tcp->u_arg[0] = 0;
1449                 if (upeek(tcp, REG_SP, &sp) < 0)
1450                         return 0;
1451                 /* There are six words followed by a 128-byte siginfo.  */
1452                 sp = sp + 6 * 4 + 128;
1453                 if (umove(tcp, sp, &uc) < 0)
1454                         return 0;
1455                 tcp->u_arg[0] = 1;
1456                 tcp->u_arg[1] = *(long *) &uc.uc_sigmask;
1457         } else {
1458                 sigset_t sigm;
1459                 long_to_sigset(tcp->u_arg[1], &sigm);
1460                 tcp->u_rval = tcp->u_error = 0;
1461                 if (tcp->u_arg[0] == 0)
1462                         return 0;
1463                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1464                 return RVAL_NONE | RVAL_STR;
1465         }
1466         return 0;
1467 #elif defined(MIPS)
1468         long sp;
1469         struct pt_regs regs;
1470         m_siginfo_t si;
1471
1472         if (ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1473                 perror("sigreturn: PTRACE_GETREGS ");
1474                 return 0;
1475         }
1476         if (entering(tcp)) {
1477                 tcp->u_arg[0] = 0;
1478                 sp = regs.regs[29];
1479                 if (umove(tcp, sp, &si) < 0)
1480                         return 0;
1481                 tcp->u_arg[0] = 1;
1482                 tcp->u_arg[1] = si.si_mask;
1483         } else {
1484                 sigset_t sigm;
1485                 long_to_sigset(tcp->u_arg[1], &sigm);
1486                 tcp->u_rval = tcp->u_error = 0;
1487                 if (tcp->u_arg[0] == 0)
1488                         return 0;
1489                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1490                 return RVAL_NONE | RVAL_STR;
1491         }
1492         return 0;
1493 #elif defined(CRISV10) || defined(CRISV32)
1494         struct sigcontext sc;
1495
1496         if (entering(tcp)) {
1497                 long regs[PT_MAX+1];
1498
1499                 tcp->u_arg[0] = 0;
1500
1501                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
1502                         perror("sigreturn: PTRACE_GETREGS");
1503                         return 0;
1504                 }
1505                 if (umove(tcp, regs[PT_USP], &sc) < 0)
1506                         return 0;
1507                 tcp->u_arg[0] = 1;
1508                 tcp->u_arg[1] = sc.oldmask;
1509         } else {
1510                 sigset_t sigm;
1511                 long_to_sigset(tcp->u_arg[1], &sigm);
1512                 tcp->u_rval = tcp->u_error = 0;
1513
1514                 if (tcp->u_arg[0] == 0)
1515                         return 0;
1516                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1517                 return RVAL_NONE | RVAL_STR;
1518         }
1519         return 0;
1520 #elif defined(TILE)
1521         struct ucontext uc;
1522         long sp;
1523
1524         /* offset of ucontext in the kernel's sigframe structure */
1525 #       define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(struct siginfo)
1526
1527         if (entering(tcp)) {
1528                 tcp->u_arg[0] = 0;
1529                 if (upeek(tcp, PTREGS_OFFSET_SP, &sp) < 0)
1530                         return 0;
1531                 if (umove(tcp, sp + SIGFRAME_UC_OFFSET, &uc) < 0)
1532                         return 0;
1533                 tcp->u_arg[0] = 1;
1534                 memcpy(tcp->u_arg + 1, &uc.uc_sigmask, sizeof(uc.uc_sigmask));
1535         }
1536         else {
1537                 sigset_t sigm;
1538
1539                 memcpy(&sigm, tcp->u_arg + 1, sizeof(sigm));
1540                 tcp->u_rval = tcp->u_error = 0;
1541                 if (tcp->u_arg[0] == 0)
1542                         return 0;
1543                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1544                 return RVAL_NONE | RVAL_STR;
1545         }
1546         return 0;
1547 #elif defined(MICROBLAZE)
1548         struct sigcontext sc;
1549
1550         /* TODO: Verify that this is correct...  */
1551         if (entering(tcp)) {
1552                 long sp;
1553
1554                 tcp->u_arg[0] = 0;
1555
1556                 /* Read r1, the stack pointer.  */
1557                 if (upeek(tcp, 1 * 4, &sp) < 0)
1558                         return 0;
1559                 if (umove(tcp, sp, &sc) < 0)
1560                         return 0;
1561                 tcp->u_arg[0] = 1;
1562                 tcp->u_arg[1] = sc.oldmask;
1563         } else {
1564                 sigset_t sigm;
1565                 long_to_sigset(tcp->u_arg[1], &sigm);
1566                 tcp->u_rval = tcp->u_error = 0;
1567                 if (tcp->u_arg[0] == 0)
1568                         return 0;
1569                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1570                 return RVAL_NONE | RVAL_STR;
1571         }
1572         return 0;
1573 #else
1574 #warning No sys_sigreturn() for this architecture
1575 #warning         (no problem, just a reminder :-)
1576         return 0;
1577 #endif
1578 }
1579
1580 int
1581 sys_siggetmask(struct tcb *tcp)
1582 {
1583         if (exiting(tcp)) {
1584                 sigset_t sigm;
1585                 long_to_sigset(tcp->u_rval, &sigm);
1586                 tcp->auxstr = sprintsigmask("mask ", &sigm, 0);
1587         }
1588         return RVAL_HEX | RVAL_STR;
1589 }
1590
1591 int
1592 sys_sigsuspend(struct tcb *tcp)
1593 {
1594         if (entering(tcp)) {
1595                 sigset_t sigm;
1596                 long_to_sigset(tcp->u_arg[2], &sigm);
1597                 printsigmask(&sigm, 0);
1598         }
1599         return 0;
1600 }
1601
1602 #endif /* LINUX */
1603
1604 #if defined(SVR4) || defined(FREEBSD)
1605
1606 int
1607 sys_sigsuspend(struct tcb *tcp)
1608 {
1609         sigset_t sigset;
1610
1611         if (entering(tcp)) {
1612                 if (umove(tcp, tcp->u_arg[0], &sigset) < 0)
1613                         tprintf("[?]");
1614                 else
1615                         printsigmask(&sigset, 0);
1616         }
1617         return 0;
1618 }
1619 #ifndef FREEBSD
1620 static const struct xlat ucontext_flags[] = {
1621         { UC_SIGMASK,   "UC_SIGMASK"    },
1622         { UC_STACK,     "UC_STACK"      },
1623         { UC_CPU,       "UC_CPU"        },
1624 #ifdef UC_FPU
1625         { UC_FPU,       "UC_FPU"        },
1626 #endif
1627 #ifdef UC_INTR
1628         { UC_INTR,      "UC_INTR"       },
1629 #endif
1630         { 0,            NULL            },
1631 };
1632 #endif /* !FREEBSD */
1633 #endif /* SVR4 || FREEBSD */
1634
1635 #if defined SVR4 || defined LINUX || defined FREEBSD
1636 #if defined LINUX && !defined SS_ONSTACK
1637 #define SS_ONSTACK      1
1638 #define SS_DISABLE      2
1639 #if __GLIBC_MINOR__ == 0
1640 typedef struct
1641 {
1642         __ptr_t ss_sp;
1643         int ss_flags;
1644         size_t ss_size;
1645 } stack_t;
1646 #endif
1647 #endif
1648 #ifdef FREEBSD
1649 #define stack_t struct sigaltstack
1650 #endif
1651
1652 static const struct xlat sigaltstack_flags[] = {
1653         { SS_ONSTACK,   "SS_ONSTACK"    },
1654         { SS_DISABLE,   "SS_DISABLE"    },
1655         { 0,            NULL            },
1656 };
1657 #endif
1658
1659 #ifdef SVR4
1660 static void
1661 printcontext(struct tcb *tcp, ucontext_t *ucp)
1662 {
1663         tprintf("{");
1664         if (!abbrev(tcp)) {
1665                 tprintf("uc_flags=");
1666                 printflags(ucontext_flags, ucp->uc_flags, "UC_???");
1667                 tprintf(", uc_link=%#lx, ", (unsigned long) ucp->uc_link);
1668         }
1669         tprintf("uc_sigmask=");
1670         printsigmask(&ucp->uc_sigmask, 0);
1671         if (!abbrev(tcp)) {
1672                 tprintf(", uc_stack={ss_sp=%#lx, ss_size=%d, ss_flags=",
1673                         (unsigned long) ucp->uc_stack.ss_sp,
1674                         ucp->uc_stack.ss_size);
1675                 printflags(sigaltstack_flags, ucp->uc_stack.ss_flags, "SS_???");
1676                 tprintf("}");
1677         }
1678         tprintf(", ...}");
1679 }
1680
1681 int
1682 sys_getcontext(struct tcb *tcp)
1683 {
1684         ucontext_t uc;
1685
1686         if (exiting(tcp)) {
1687                 if (tcp->u_error)
1688                         tprintf("%#lx", tcp->u_arg[0]);
1689                 else if (!tcp->u_arg[0])
1690                         tprintf("NULL");
1691                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1692                         tprintf("{...}");
1693                 else
1694                         printcontext(tcp, &uc);
1695         }
1696         return 0;
1697 }
1698
1699 int
1700 sys_setcontext(struct tcb *tcp)
1701 {
1702         ucontext_t uc;
1703
1704         if (entering(tcp)) {
1705                 if (!tcp->u_arg[0])
1706                         tprintf("NULL");
1707                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1708                         tprintf("{...}");
1709                 else
1710                         printcontext(tcp, &uc);
1711         }
1712         else {
1713                 tcp->u_rval = tcp->u_error = 0;
1714                 if (tcp->u_arg[0] == 0)
1715                         return 0;
1716                 return RVAL_NONE;
1717         }
1718         return 0;
1719 }
1720
1721 #endif /* SVR4 */
1722
1723 #if defined(LINUX) || defined(FREEBSD)
1724
1725 static int
1726 print_stack_t(struct tcb *tcp, unsigned long addr)
1727 {
1728         stack_t ss;
1729         if (umove(tcp, addr, &ss) < 0)
1730                 return -1;
1731         tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1732         printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1733         tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1734         return 0;
1735 }
1736
1737 int
1738 sys_sigaltstack(struct tcb *tcp)
1739 {
1740         if (entering(tcp)) {
1741                 if (tcp->u_arg[0] == 0)
1742                         tprintf("NULL");
1743                 else if (print_stack_t(tcp, tcp->u_arg[0]) < 0)
1744                         return -1;
1745         }
1746         else {
1747                 tprintf(", ");
1748                 if (tcp->u_arg[1] == 0)
1749                         tprintf("NULL");
1750                 else if (print_stack_t(tcp, tcp->u_arg[1]) < 0)
1751                         return -1;
1752         }
1753         return 0;
1754 }
1755 #endif
1756
1757 #ifdef HAVE_SIGACTION
1758
1759 int
1760 sys_sigprocmask(struct tcb *tcp)
1761 {
1762 #ifdef ALPHA
1763         if (entering(tcp)) {
1764                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1765                 tprintf(", ");
1766                 printsigmask(tcp->u_arg[1], 0);
1767         }
1768         else if (!syserror(tcp)) {
1769                 tcp->auxstr = sprintsigmask("old mask ", tcp->u_rval, 0);
1770                 return RVAL_HEX | RVAL_STR;
1771         }
1772 #else /* !ALPHA */
1773         if (entering(tcp)) {
1774 #ifdef SVR4
1775                 if (tcp->u_arg[0] == 0)
1776                         tprintf("0");
1777                 else
1778 #endif /* SVR4 */
1779                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1780                 tprintf(", ");
1781                 print_sigset(tcp, tcp->u_arg[1], 0);
1782                 tprintf(", ");
1783         }
1784         else {
1785                 if (!tcp->u_arg[2])
1786                         tprintf("NULL");
1787                 else if (syserror(tcp))
1788                         tprintf("%#lx", tcp->u_arg[2]);
1789                 else
1790                         print_sigset(tcp, tcp->u_arg[2], 0);
1791         }
1792 #endif /* !ALPHA */
1793         return 0;
1794 }
1795
1796 #endif /* HAVE_SIGACTION */
1797
1798 int
1799 sys_kill(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(struct tcb *tcp)
1816 {
1817         return sys_kill(tcp);
1818 }
1819 #endif /* FREEBSD || SUNOS4 */
1820
1821 #ifdef LINUX
1822 int
1823 sys_tgkill(struct tcb *tcp)
1824 {
1825         if (entering(tcp)) {
1826                 tprintf("%ld, %ld, %s",
1827                         tcp->u_arg[0], tcp->u_arg[1], signame(tcp->u_arg[2]));
1828         }
1829         return 0;
1830 }
1831 #endif
1832
1833 int
1834 sys_sigpending(struct tcb *tcp)
1835 {
1836         sigset_t sigset;
1837
1838         if (exiting(tcp)) {
1839                 if (syserror(tcp))
1840                         tprintf("%#lx", tcp->u_arg[0]);
1841                 else if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1842                         tprintf("[?]");
1843                 else
1844                         printsigmask(&sigset, 0);
1845         }
1846         return 0;
1847 }
1848
1849 #ifdef SVR4
1850 int sys_sigwait(struct tcb *tcp)
1851 {
1852         sigset_t sigset;
1853
1854         if (entering(tcp)) {
1855                 if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1856                         tprintf("[?]");
1857                 else
1858                         printsigmask(&sigset, 0);
1859         }
1860         else {
1861                 if (!syserror(tcp)) {
1862                         tcp->auxstr = signalent[tcp->u_rval];
1863                         return RVAL_DECIMAL | RVAL_STR;
1864                 }
1865         }
1866         return 0;
1867 }
1868 #endif /* SVR4 */
1869
1870 #ifdef LINUX
1871
1872 int
1873 sys_rt_sigprocmask(struct tcb *tcp)
1874 {
1875         sigset_t sigset;
1876
1877         /* Note: arg[3] is the length of the sigset. */
1878         if (entering(tcp)) {
1879                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1880                 tprintf(", ");
1881                 if (!tcp->u_arg[1])
1882                         tprintf("NULL, ");
1883                 else if (copy_sigset_len(tcp, tcp->u_arg[1], &sigset, tcp->u_arg[3]) < 0)
1884                         tprintf("%#lx, ", tcp->u_arg[1]);
1885                 else {
1886                         printsigmask(&sigset, 1);
1887                         tprintf(", ");
1888                 }
1889         }
1890         else {
1891                 if (!tcp->u_arg[2])
1892
1893                         tprintf("NULL");
1894                 else if (syserror(tcp))
1895                         tprintf("%#lx", tcp->u_arg[2]);
1896                 else if (copy_sigset_len(tcp, tcp->u_arg[2], &sigset, tcp->u_arg[3]) < 0)
1897                         tprintf("[?]");
1898                 else
1899                         printsigmask(&sigset, 1);
1900                 tprintf(", %lu", tcp->u_arg[3]);
1901         }
1902         return 0;
1903 }
1904
1905
1906 /* Structure describing the action to be taken when a signal arrives.  */
1907 struct new_sigaction
1908 {
1909         __sighandler_t __sa_handler;
1910         unsigned long sa_flags;
1911         void (*sa_restorer) (void);
1912         /* Kernel treats sa_mask as an array of longs. */
1913         unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1914 };
1915 /* Same for i386-on-x86_64 and similar cases */
1916 struct new_sigaction32
1917 {
1918         uint32_t __sa_handler;
1919         uint32_t sa_flags;
1920         uint32_t sa_restorer;
1921         uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1922 };
1923
1924
1925 int
1926 sys_rt_sigaction(struct tcb *tcp)
1927 {
1928         struct new_sigaction sa;
1929         sigset_t sigset;
1930         long addr;
1931         int r;
1932
1933         if (entering(tcp)) {
1934                 printsignal(tcp->u_arg[0]);
1935                 tprintf(", ");
1936                 addr = tcp->u_arg[1];
1937         } else
1938                 addr = tcp->u_arg[2];
1939
1940         if (addr == 0) {
1941                 tprintf("NULL");
1942                 goto after_sa;
1943         }
1944         if (!verbose(tcp)) {
1945                 tprintf("%#lx", addr);
1946                 goto after_sa;
1947         }
1948 #if SUPPORTED_PERSONALITIES > 1
1949         if (personality_wordsize[current_personality] != sizeof(sa.sa_flags)
1950          && personality_wordsize[current_personality] == 4
1951         ) {
1952                 struct new_sigaction32 sa32;
1953                 r = umove(tcp, addr, &sa32);
1954                 if (r >= 0) {
1955                         memset(&sa, 0, sizeof(sa));
1956                         sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1957                         sa.sa_flags     = sa32.sa_flags;
1958                         sa.sa_restorer  = (void*)(unsigned long)sa32.sa_restorer;
1959                         /* Kernel treats sa_mask as an array of longs.
1960                          * For 32-bit process, "long" is uint32_t, thus, for example,
1961                          * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1962                          * But for (64-bit) kernel, 32th bit in sa_mask is
1963                          * 32th bit in 0th (64-bit) long!
1964                          * For little-endian, it's the same.
1965                          * For big-endian, we swap 32-bit words.
1966                          */
1967                         sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1968                 }
1969         } else
1970 #endif
1971         {
1972                 r = umove(tcp, addr, &sa);
1973         }
1974         if (r < 0) {
1975                 tprintf("{...}");
1976                 goto after_sa;
1977         }
1978         /* Architectures using function pointers, like
1979          * hppa, may need to manipulate the function pointer
1980          * to compute the result of a comparison. However,
1981          * the SA_HANDLER function pointer exists only in
1982          * the address space of the traced process, and can't
1983          * be manipulated by strace. In order to prevent the
1984          * compiler from generating code to manipulate
1985          * SA_HANDLER we cast the function pointers to long. */
1986         if ((long)sa.__sa_handler == (long)SIG_ERR)
1987                 tprintf("{SIG_ERR, ");
1988         else if ((long)sa.__sa_handler == (long)SIG_DFL)
1989                 tprintf("{SIG_DFL, ");
1990         else if ((long)sa.__sa_handler == (long)SIG_IGN)
1991                 tprintf("{SIG_IGN, ");
1992         else
1993                 tprintf("{%#lx, ", (long) sa.__sa_handler);
1994         /* Questionable code below.
1995          * Kernel won't handle sys_rt_sigaction
1996          * with wrong sigset size (just returns EINVAL)
1997          * therefore tcp->u_arg[3(4)] _must_ be NSIG / 8 here,
1998          * and we always use smaller memcpy. */
1999         sigemptyset(&sigset);
2000 #ifdef LINUXSPARC
2001         if (tcp->u_arg[4] <= sizeof(sigset))
2002                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[4]);
2003 #else
2004         if (tcp->u_arg[3] <= sizeof(sigset))
2005                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[3]);
2006 #endif
2007         else
2008                 memcpy(&sigset, &sa.sa_mask, sizeof(sigset));
2009         printsigmask(&sigset, 1);
2010         tprintf(", ");
2011         printflags(sigact_flags, sa.sa_flags, "SA_???");
2012 #ifdef SA_RESTORER
2013         if (sa.sa_flags & SA_RESTORER)
2014                 tprintf(", %p", sa.sa_restorer);
2015 #endif
2016         tprintf("}");
2017
2018  after_sa:
2019         if (entering(tcp))
2020                 tprintf(", ");
2021         else
2022 #ifdef LINUXSPARC
2023                 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
2024 #elif defined(ALPHA)
2025                 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
2026 #else
2027                 tprintf(", %lu", tcp->u_arg[3]);
2028 #endif
2029         return 0;
2030 }
2031
2032 int
2033 sys_rt_sigpending(struct tcb *tcp)
2034 {
2035         sigset_t sigset;
2036
2037         if (exiting(tcp)) {
2038                 if (syserror(tcp))
2039                         tprintf("%#lx", tcp->u_arg[0]);
2040                 else if (copy_sigset_len(tcp, tcp->u_arg[0],
2041                                          &sigset, tcp->u_arg[1]) < 0)
2042                         tprintf("[?]");
2043                 else
2044                         printsigmask(&sigset, 1);
2045         }
2046         return 0;
2047 }
2048
2049 int
2050 sys_rt_sigsuspend(struct tcb *tcp)
2051 {
2052         if (entering(tcp)) {
2053                 sigset_t sigm;
2054                 if (copy_sigset_len(tcp, tcp->u_arg[0], &sigm, tcp->u_arg[1]) < 0)
2055                         tprintf("[?]");
2056                 else
2057                         printsigmask(&sigm, 1);
2058         }
2059         return 0;
2060 }
2061
2062 int
2063 sys_rt_sigqueueinfo(struct tcb *tcp)
2064 {
2065         if (entering(tcp)) {
2066                 siginfo_t si;
2067                 tprintf("%lu, ", tcp->u_arg[0]);
2068                 printsignal(tcp->u_arg[1]);
2069                 tprintf(", ");
2070                 if (umove(tcp, tcp->u_arg[2], &si) < 0)
2071                         tprintf("%#lx", tcp->u_arg[2]);
2072                 else
2073                         printsiginfo(&si, verbose(tcp));
2074         }
2075         return 0;
2076 }
2077
2078 int sys_rt_sigtimedwait(struct tcb *tcp)
2079 {
2080         if (entering(tcp)) {
2081                 sigset_t sigset;
2082
2083                 if (copy_sigset_len(tcp, tcp->u_arg[0],
2084                                     &sigset, tcp->u_arg[3]) < 0)
2085                         tprintf("[?]");
2086                 else
2087                         printsigmask(&sigset, 1);
2088                 tprintf(", ");
2089                 /* This is the only "return" parameter, */
2090                 if (tcp->u_arg[1] != 0)
2091                         return 0;
2092                 /* ... if it's NULL, can decode all on entry */
2093                 tprintf("NULL, ");
2094         }
2095         else if (tcp->u_arg[1] != 0) {
2096                 /* syscall exit, and u_arg[1] wasn't NULL */
2097                 if (syserror(tcp))
2098                         tprintf("%#lx, ", tcp->u_arg[1]);
2099                 else {
2100                         siginfo_t si;
2101                         if (umove(tcp, tcp->u_arg[1], &si) < 0)
2102                                 tprintf("%#lx, ", tcp->u_arg[1]);
2103                         else {
2104                                 printsiginfo(&si, verbose(tcp));
2105                                 tprintf(", ");
2106                         }
2107                 }
2108         }
2109         else {
2110                 /* syscall exit, and u_arg[1] was NULL */
2111                 return 0;
2112         }
2113         print_timespec(tcp, tcp->u_arg[2]);
2114         tprintf(", %d", (int) tcp->u_arg[3]);
2115         return 0;
2116 };
2117
2118 int
2119 sys_restart_syscall(struct tcb *tcp)
2120 {
2121         if (entering(tcp))
2122                 tprintf("<... resuming interrupted call ...>");
2123         return 0;
2124 }
2125
2126 static int
2127 do_signalfd(struct tcb *tcp, int flags_arg)
2128 {
2129         if (entering(tcp)) {
2130                 printfd(tcp, tcp->u_arg[0]);
2131                 tprintf(", ");
2132                 print_sigset(tcp, tcp->u_arg[1], 1);
2133                 tprintf(", %lu", tcp->u_arg[2]);
2134                 if (flags_arg >= 0) {
2135                         tprintf(", ");
2136                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
2137                 }
2138         }
2139         return 0;
2140 }
2141
2142 int
2143 sys_signalfd(struct tcb *tcp)
2144 {
2145         return do_signalfd(tcp, -1);
2146 }
2147
2148 int
2149 sys_signalfd4(struct tcb *tcp)
2150 {
2151         return do_signalfd(tcp, 3);
2152 }
2153 #endif /* LINUX */