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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *      $Id$
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <stdint.h>
  39 #include <signal.h>
  40 #include <sys/user.h>
  41 #include <fcntl.h>
  42
  43 #ifdef SVR4
  44 #include <sys/ucontext.h>
  45 #endif /* SVR4 */
  46
  47 #ifdef HAVE_SYS_REG_H
  48 # include <sys/reg.h>
  49 #ifndef PTRACE_PEEKUSR
  50 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  51 #endif
  52 #ifndef PTRACE_POKEUSR
  53 # define PTRACE_POKEUSR PTRACE_POKEUSER
  54 #endif
  55 #elif defined(HAVE_LINUX_PTRACE_H)
  56 #undef PTRACE_SYSCALL
  57 # ifdef HAVE_STRUCT_IA64_FPREG
  58 #  define ia64_fpreg XXX_ia64_fpreg
  59 # endif
  60 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
  61 #  define pt_all_user_regs XXX_pt_all_user_regs
  62 # endif
  63 #include <linux/ptrace.h>
  64 # undef ia64_fpreg
  65 # undef pt_all_user_regs
  66 #endif
  67
  68
  69 #ifdef LINUX
  70
  71 #ifdef IA64
  72 # include <asm/ptrace_offsets.h>
  73 #endif /* !IA64 */
  74
  75 #if defined (LINUX) && defined (SPARC64)
  76 # undef PTRACE_GETREGS
  77 # define PTRACE_GETREGS PTRACE_GETREGS64
  78 # undef PTRACE_SETREGS
  79 # define PTRACE_SETREGS PTRACE_SETREGS64
  80 #endif /* LINUX && SPARC64 */
  81
  82 #if defined (SPARC) || defined (SPARC64) || defined (MIPS)
  83 typedef struct {
  84         struct pt_regs          si_regs;
  85         int                     si_mask;
  86 } m_siginfo_t;
  87 #elif defined HAVE_ASM_SIGCONTEXT_H
  88 #if !defined(IA64) && !defined(X86_64)
  89 #include <asm/sigcontext.h>
  90 #endif /* !IA64 && !X86_64 */
  91 #else /* !HAVE_ASM_SIGCONTEXT_H */
  92 #if defined I386 && !defined HAVE_STRUCT_SIGCONTEXT_STRUCT
  93 struct sigcontext_struct {
  94         unsigned short gs, __gsh;
  95         unsigned short fs, __fsh;
  96         unsigned short es, __esh;
  97         unsigned short ds, __dsh;
  98         unsigned long edi;
  99         unsigned long esi;
 100         unsigned long ebp;
 101         unsigned long esp;
 102         unsigned long ebx;
 103         unsigned long edx;
 104         unsigned long ecx;
 105         unsigned long eax;
 106         unsigned long trapno;
 107         unsigned long err;
 108         unsigned long eip;
 109         unsigned short cs, __csh;
 110         unsigned long eflags;
 111         unsigned long esp_at_signal;
 112         unsigned short ss, __ssh;
 113         unsigned long i387;
 114         unsigned long oldmask;
 115         unsigned long cr2;
 116 };
 117 #else /* !I386 */
 118 #if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT
 119 struct sigcontext
 120 {
 121         unsigned long sc_mask;
 122         unsigned long sc_usp;
 123         unsigned long sc_d0;
 124         unsigned long sc_d1;
 125         unsigned long sc_a0;
 126         unsigned long sc_a1;
 127         unsigned short sc_sr;
 128         unsigned long sc_pc;
 129         unsigned short sc_formatvec;
 130 };
 131 #endif /* M68K */
 132 #endif /* !I386 */
 133 #endif /* !HAVE_ASM_SIGCONTEXT_H */
 134 #ifndef NSIG
 135 #define NSIG 32
 136 #endif
 137 #ifdef ARM
 138 #undef NSIG
 139 #define NSIG 32
 140 #endif
 141 #endif /* LINUX */
 142
 143 const char *const signalent0[] = {
 144 #include "signalent.h"
 145 };
 146 const int nsignals0 = sizeof signalent0 / sizeof signalent0[0];
 147
 148 #if SUPPORTED_PERSONALITIES >= 2
 149 const char *const signalent1[] = {
 150 #include "signalent1.h"
 151 };
 152 const int nsignals1 = sizeof signalent1 / sizeof signalent1[0];
 153 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 154
 155 #if SUPPORTED_PERSONALITIES >= 3
 156 const char *const signalent2[] = {
 157 #include "signalent2.h"
 158 };
 159 const int nsignals2 = sizeof signalent2 / sizeof signalent2[0];
 160 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 161
 162 const char *const *signalent;
 163 int nsignals;
 164
 165 #if defined(SUNOS4) || defined(FREEBSD)
 166
 167 static const struct xlat sigvec_flags[] = {
 168         { SV_ONSTACK,   "SV_ONSTACK"    },
 169         { SV_INTERRUPT, "SV_INTERRUPT"  },
 170         { SV_RESETHAND, "SV_RESETHAND"  },
 171         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 172         { 0,            NULL            },
 173 };
 174
 175 #endif /* SUNOS4 || FREEBSD */
 176
 177 #ifdef HAVE_SIGACTION
 178
 179 #if defined LINUX && (defined I386 || defined X86_64)
 180 /* The libc headers do not define this constant since it should only be
 181    used by the implementation.  So wwe define it here.  */
 182 # ifndef SA_RESTORER
 183 #  define SA_RESTORER 0x04000000
 184 # endif
 185 #endif
 186
 187 static const struct xlat sigact_flags[] = {
 188 #ifdef SA_RESTORER
 189         { SA_RESTORER,  "SA_RESTORER"   },
 190 #endif
 191 #ifdef SA_STACK
 192         { SA_STACK,     "SA_STACK"      },
 193 #endif
 194 #ifdef SA_RESTART
 195         { SA_RESTART,   "SA_RESTART"    },
 196 #endif
 197 #ifdef SA_INTERRUPT
 198         { SA_INTERRUPT, "SA_INTERRUPT"  },
 199 #endif
 200 #ifdef SA_NODEFER
 201         { SA_NODEFER,   "SA_NODEFER"    },
 202 #endif
 203 #if defined SA_NOMASK && SA_NODEFER != SA_NOMASK
 204         { SA_NOMASK,    "SA_NOMASK"     },
 205 #endif
 206 #ifdef SA_RESETHAND
 207         { SA_RESETHAND, "SA_RESETHAND"  },
 208 #endif
 209 #if defined SA_ONESHOT && SA_ONESHOT != SA_RESETHAND
 210         { SA_ONESHOT,   "SA_ONESHOT"    },
 211 #endif
 212 #ifdef SA_SIGINFO
 213         { SA_SIGINFO,   "SA_SIGINFO"    },
 214 #endif
 215 #ifdef SA_RESETHAND
 216         { SA_RESETHAND, "SA_RESETHAND"  },
 217 #endif
 218 #ifdef SA_ONSTACK
 219         { SA_ONSTACK,   "SA_ONSTACK"    },
 220 #endif
 221 #ifdef SA_NODEFER
 222         { SA_NODEFER,   "SA_NODEFER"    },
 223 #endif
 224 #ifdef SA_NOCLDSTOP
 225         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 226 #endif
 227 #ifdef SA_NOCLDWAIT
 228         { SA_NOCLDWAIT, "SA_NOCLDWAIT"  },
 229 #endif
 230 #ifdef _SA_BSDCALL
 231         { _SA_BSDCALL,  "_SA_BSDCALL"   },
 232 #endif
 233 #ifdef SA_NOPTRACE
 234         { SA_NOPTRACE,  "SA_NOPTRACE"   },
 235 #endif
 236         { 0,            NULL            },
 237 };
 238
 239 static const struct xlat sigprocmaskcmds[] = {
 240         { SIG_BLOCK,    "SIG_BLOCK"     },
 241         { SIG_UNBLOCK,  "SIG_UNBLOCK"   },
 242         { SIG_SETMASK,  "SIG_SETMASK"   },
 243 #ifdef SIG_SETMASK32
 244         { SIG_SETMASK32,"SIG_SETMASK32" },
 245 #endif
 246         { 0,            NULL            },
 247 };
 248
 249 #endif /* HAVE_SIGACTION */
 250
 251 /* Anonymous realtime signals. */
 252 /* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a
 253    constant.  This is what we want.  Otherwise, just use SIGRTMIN. */
 254 #ifdef SIGRTMIN
 255 #ifndef __SIGRTMIN
 256 #define __SIGRTMIN SIGRTMIN
 257 #define __SIGRTMAX SIGRTMAX /* likewise */
 258 #endif
 259 #endif
 260
 261 const char *
 262 signame(sig)
 263 int sig;
 264 {
 265         static char buf[30];
 266         if (sig >= 0 && sig < nsignals) {
 267                 return signalent[sig];
 268 #ifdef SIGRTMIN
 269         } else if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) {
 270                 sprintf(buf, "SIGRT_%ld", (long)(sig - __SIGRTMIN));
 271                 return buf;
 272 #endif /* SIGRTMIN */
 273         } else {
 274                 sprintf(buf, "%d", sig);
 275                 return buf;
 276         }
 277 }
 278
 279 #ifndef UNIXWARE
 280 static void
 281 long_to_sigset(l, s)
 282 long l;
 283 sigset_t *s;
 284 {
 285         sigemptyset(s);
 286         *(long *)s = l;
 287 }
 288 #endif
 289
 290 static int
 291 copy_sigset_len(tcp, addr, s, len)
 292 struct tcb *tcp;
 293 long addr;
 294 sigset_t *s;
 295 int len;
 296 {
 297         if (len > sizeof(*s))
 298                 len = sizeof(*s);
 299         sigemptyset(s);
 300         if (umoven(tcp, addr, len, (char *)s) < 0)
 301                 return -1;
 302         return 0;
 303 }
 304
 305 #ifdef LINUX
 306 /* Original sigset is unsigned long */
 307 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(long))
 308 #else
 309 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(sigset_t))
 310 #endif
 311
 312 static const char *
 313 sprintsigmask(const char *str, sigset_t *mask, int rt)
 314 /* set might include realtime sigs */
 315 {
 316         int i, nsigs;
 317         int maxsigs;
 318         char *format, *s;
 319         static char outstr[8 * sizeof(sigset_t) * 8];
 320
 321         strcpy(outstr, str);
 322         s = outstr + strlen(outstr);
 323         nsigs = 0;
 324         maxsigs = nsignals;
 325 #ifdef __SIGRTMAX
 326         if (rt)
 327                 maxsigs = __SIGRTMAX; /* instead */
 328 #endif
 329         for (i = 1; i < maxsigs; i++) {
 330                 if (sigismember(mask, i) == 1)
 331                         nsigs++;
 332         }
 333         if (nsigs >= nsignals * 2 / 3) {
 334                 *s++ = '~';
 335                 for (i = 1; i < maxsigs; i++) {
 336                         switch (sigismember(mask, i)) {
 337                         case 1:
 338                                 sigdelset(mask, i);
 339                                 break;
 340                         case 0:
 341                                 sigaddset(mask, i);
 342                                 break;
 343                         }
 344                 }
 345         }
 346         format = "%s";
 347         *s++ = '[';
 348         for (i = 1; i < maxsigs; i++) {
 349                 if (sigismember(mask, i) == 1) {
 350                         /* real-time signals on solaris don't have
 351                          * signalent entries
 352                          */
 353                         if (i < nsignals) {
 354                                 sprintf(s, format, signalent[i] + 3);
 355                         }
 356 #ifdef SIGRTMIN
 357                         else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
 358                                 char tsig[40];
 359                                 sprintf(tsig, "RT_%u", i - __SIGRTMIN);
 360                                 sprintf(s, format, tsig);
 361                         }
 362 #endif /* SIGRTMIN */
 363                         else {
 364                                 char tsig[32];
 365                                 sprintf(tsig, "%u", i);
 366                                 sprintf(s, format, tsig);
 367                         }
 368                         s += strlen(s);
 369                         format = " %s";
 370                 }
 371         }
 372         *s++ = ']';
 373         *s = '\0';
 374         return outstr;
 375 }
 376
 377 static void
 378 printsigmask(mask, rt)
 379 sigset_t *mask;
 380 int rt;
 381 {
 382         tprintf("%s", sprintsigmask("", mask, rt));
 383 }
 384
 385 void
 386 printsignal(nr)
 387 int nr;
 388 {
 389         tprintf("%s", signame(nr));
 390 }
 391
 392 void
 393 print_sigset(struct tcb *tcp, long addr, int rt)
 394 {
 395         sigset_t ss;
 396
 397         if (!addr)
 398                 tprintf("NULL");
 399         else if (copy_sigset(tcp, addr, &ss) < 0)
 400                 tprintf("%#lx", addr);
 401         else
 402                 printsigmask(&ss, rt);
 403 }
 404
 405 #ifdef LINUX
 406
 407 #ifndef ILL_ILLOPC
 408 #define ILL_ILLOPC      1       /* illegal opcode */
 409 #define ILL_ILLOPN      2       /* illegal operand */
 410 #define ILL_ILLADR      3       /* illegal addressing mode */
 411 #define ILL_ILLTRP      4       /* illegal trap */
 412 #define ILL_PRVOPC      5       /* privileged opcode */
 413 #define ILL_PRVREG      6       /* privileged register */
 414 #define ILL_COPROC      7       /* coprocessor error */
 415 #define ILL_BADSTK      8       /* internal stack error */
 416 #define FPE_INTDIV      1       /* integer divide by zero */
 417 #define FPE_INTOVF      2       /* integer overflow */
 418 #define FPE_FLTDIV      3       /* floating point divide by zero */
 419 #define FPE_FLTOVF      4       /* floating point overflow */
 420 #define FPE_FLTUND      5       /* floating point underflow */
 421 #define FPE_FLTRES      6       /* floating point inexact result */
 422 #define FPE_FLTINV      7       /* floating point invalid operation */
 423 #define FPE_FLTSUB      8       /* subscript out of range */
 424 #define SEGV_MAPERR     1       /* address not mapped to object */
 425 #define SEGV_ACCERR     2       /* invalid permissions for mapped object */
 426 #define BUS_ADRALN      1       /* invalid address alignment */
 427 #define BUS_ADRERR      2       /* non-existant physical address */
 428 #define BUS_OBJERR      3       /* object specific hardware error */
 429 #define TRAP_BRKPT      1       /* process breakpoint */
 430 #define TRAP_TRACE      2       /* process trace trap */
 431 #define CLD_EXITED      1       /* child has exited */
 432 #define CLD_KILLED      2       /* child was killed */
 433 #define CLD_DUMPED      3       /* child terminated abnormally */
 434 #define CLD_TRAPPED     4       /* traced child has trapped */
 435 #define CLD_STOPPED     5       /* child has stopped */
 436 #define CLD_CONTINUED   6       /* stopped child has continued */
 437 #define POLL_IN         1       /* data input available */
 438 #define POLL_OUT        2       /* output buffers available */
 439 #define POLL_MSG        3       /* input message available */
 440 #define POLL_ERR        4       /* i/o error */
 441 #define POLL_PRI        5       /* high priority input available */
 442 #define POLL_HUP        6       /* device disconnected */
 443 #define SI_USER         0       /* sent by kill, sigsend, raise */
 444 #define SI_QUEUE        -1      /* sent by sigqueue */
 445 #define SI_TIMER        -2      /* sent by timer expiration */
 446 #define SI_MESGQ        -3      /* sent by real time mesq state change */
 447 #define SI_ASYNCIO      -4      /* sent by AIO completion */
 448 #define SI_SIGIO        -5      /* Sent by SIGIO */
 449 #define SI_TKILL        -6      /* Sent by tkill */
 450 #endif
 451
 452 #if __GLIBC_MINOR__ < 1
 453 /* Type for data associated with a signal.  */
 454 typedef union sigval
 455 {
 456         int sival_int;
 457         void *sival_ptr;
 458 } sigval_t;
 459
 460 # define __SI_MAX_SIZE     128
 461 # define __SI_PAD_SIZE     ((__SI_MAX_SIZE / sizeof (int)) - 3)
 462
 463 typedef struct siginfo
 464 {
 465         int si_signo;               /* Signal number.  */
 466         int si_errno;               /* If non-zero, an errno value associated with
 467                                                                    this signal, as defined in <errno.h>.  */
 468         int si_code;                /* Signal code.  */
 469
 470         union
 471         {
 472                 int _pad[__SI_PAD_SIZE];
 473
 474                 /* kill().  */
 475                 struct
 476                 {
 477                         __pid_t si_pid;     /* Sending process ID.  */
 478                         __uid_t si_uid;     /* Real user ID of sending process.  */
 479                 } _kill;
 480
 481                 /* POSIX.1b timers.  */
 482                 struct
 483                 {
 484                         unsigned int _timer1;
 485                         unsigned int _timer2;
 486                 } _timer;
 487
 488                 /* POSIX.1b signals.  */
 489                 struct
 490                 {
 491                         __pid_t si_pid;     /* Sending process ID.  */
 492                         __uid_t si_uid;     /* Real user ID of sending process.  */
 493                         sigval_t si_sigval; /* Signal value.  */
 494                 } _rt;
 495
 496                 /* SIGCHLD.  */
 497                 struct
 498                 {
 499                         __pid_t si_pid;     /* Which child.  */
 500                         int si_status;      /* Exit value or signal.  */
 501                         __clock_t si_utime;
 502                         __clock_t si_stime;
 503                 } _sigchld;
 504
 505                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
 506                 struct
 507                 {
 508                         void *si_addr;      /* Faulting insn/memory ref.  */
 509                 } _sigfault;
 510
 511                 /* SIGPOLL.  */
 512                 struct
 513                 {
 514                         int si_band;        /* Band event for SIGPOLL.  */
 515                         int si_fd;
 516                 } _sigpoll;
 517         } _sifields;
 518 } siginfo_t;
 519
 520 #define si_pid          _sifields._kill.si_pid
 521 #define si_uid          _sifields._kill.si_uid
 522 #define si_status       _sifields._sigchld.si_status
 523 #define si_utime        _sifields._sigchld.si_utime
 524 #define si_stime        _sifields._sigchld.si_stime
 525 #define si_value        _sifields._rt.si_sigval
 526 #define si_int          _sifields._rt.si_sigval.sival_int
 527 #define si_ptr          _sifields._rt.si_sigval.sival_ptr
 528 #define si_addr         _sifields._sigfault.si_addr
 529 #define si_band         _sifields._sigpoll.si_band
 530 #define si_fd           _sifields._sigpoll.si_fd
 531
 532 #endif
 533
 534 #endif
 535
 536 #if defined (SVR4) || defined (LINUX)
 537
 538 static const struct xlat siginfo_codes[] = {
 539 #ifdef SI_NOINFO
 540         { SI_NOINFO,    "SI_NOINFO"     },
 541 #endif
 542 #ifdef SI_USER
 543         { SI_USER,      "SI_USER"       },
 544 #endif
 545 #ifdef SI_LWP
 546         { SI_LWP,       "SI_LWP"        },
 547 #endif
 548 #ifdef SI_QUEUE
 549         { SI_QUEUE,     "SI_QUEUE"      },
 550 #endif
 551 #ifdef SI_TIMER
 552         { SI_TIMER,     "SI_TIMER"      },
 553 #endif
 554 #ifdef SI_ASYNCIO
 555         { SI_ASYNCIO,   "SI_ASYNCIO"    },
 556 #endif
 557 #ifdef SI_MESGQ
 558         { SI_MESGQ,     "SI_MESGQ"      },
 559 #endif
 560 #ifdef SI_SIGIO
 561         { SI_SIGIO,     "SI_SIGIO"      },
 562 #endif
 563 #ifdef SI_TKILL
 564         { SI_TKILL,     "SI_TKILL"      },
 565 #endif
 566         { 0,            NULL            },
 567 };
 568
 569 static const struct xlat sigill_codes[] = {
 570         { ILL_ILLOPC,   "ILL_ILLOPC"    },
 571         { ILL_ILLOPN,   "ILL_ILLOPN"    },
 572         { ILL_ILLADR,   "ILL_ILLADR"    },
 573         { ILL_ILLTRP,   "ILL_ILLTRP"    },
 574         { ILL_PRVOPC,   "ILL_PRVOPC"    },
 575         { ILL_PRVREG,   "ILL_PRVREG"    },
 576         { ILL_COPROC,   "ILL_COPROC"    },
 577         { ILL_BADSTK,   "ILL_BADSTK"    },
 578         { 0,            NULL            },
 579 };
 580
 581 static const struct xlat sigfpe_codes[] = {
 582         { FPE_INTDIV,   "FPE_INTDIV"    },
 583         { FPE_INTOVF,   "FPE_INTOVF"    },
 584         { FPE_FLTDIV,   "FPE_FLTDIV"    },
 585         { FPE_FLTOVF,   "FPE_FLTOVF"    },
 586         { FPE_FLTUND,   "FPE_FLTUND"    },
 587         { FPE_FLTRES,   "FPE_FLTRES"    },
 588         { FPE_FLTINV,   "FPE_FLTINV"    },
 589         { FPE_FLTSUB,   "FPE_FLTSUB"    },
 590         { 0,            NULL            },
 591 };
 592
 593 static const struct xlat sigtrap_codes[] = {
 594         { TRAP_BRKPT,   "TRAP_BRKPT"    },
 595         { TRAP_TRACE,   "TRAP_TRACE"    },
 596         { 0,            NULL            },
 597 };
 598
 599 static const struct xlat sigchld_codes[] = {
 600         { CLD_EXITED,   "CLD_EXITED"    },
 601         { CLD_KILLED,   "CLD_KILLED"    },
 602         { CLD_DUMPED,   "CLD_DUMPED"    },
 603         { CLD_TRAPPED,  "CLD_TRAPPED"   },
 604         { CLD_STOPPED,  "CLD_STOPPED"   },
 605         { CLD_CONTINUED,"CLD_CONTINUED" },
 606         { 0,            NULL            },
 607 };
 608
 609 static const struct xlat sigpoll_codes[] = {
 610         { POLL_IN,      "POLL_IN"       },
 611         { POLL_OUT,     "POLL_OUT"      },
 612         { POLL_MSG,     "POLL_MSG"      },
 613         { POLL_ERR,     "POLL_ERR"      },
 614         { POLL_PRI,     "POLL_PRI"      },
 615         { POLL_HUP,     "POLL_HUP"      },
 616         { 0,            NULL            },
 617 };
 618
 619 static const struct xlat sigprof_codes[] = {
 620 #ifdef PROF_SIG
 621         { PROF_SIG,     "PROF_SIG"      },
 622 #endif
 623         { 0,            NULL            },
 624 };
 625
 626 #ifdef SIGEMT
 627 static const struct xlat sigemt_codes[] = {
 628 #ifdef EMT_TAGOVF
 629         { EMT_TAGOVF,   "EMT_TAGOVF"    },
 630 #endif
 631         { 0,            NULL            },
 632 };
 633 #endif
 634
 635 static const struct xlat sigsegv_codes[] = {
 636         { SEGV_MAPERR,  "SEGV_MAPERR"   },
 637         { SEGV_ACCERR,  "SEGV_ACCERR"   },
 638         { 0,            NULL            },
 639 };
 640
 641 static const struct xlat sigbus_codes[] = {
 642         { BUS_ADRALN,   "BUS_ADRALN"    },
 643         { BUS_ADRERR,   "BUS_ADRERR"    },
 644         { BUS_OBJERR,   "BUS_OBJERR"    },
 645         { 0,            NULL            },
 646 };
 647
 648 void
 649 printsiginfo(sip, verbose)
 650 siginfo_t *sip;
 651 int verbose;
 652 {
 653         const char *code;
 654
 655         if (sip->si_signo == 0) {
 656                 tprintf ("{}");
 657                 return;
 658         }
 659         tprintf("{si_signo=");
 660         printsignal(sip->si_signo);
 661         code = xlookup(siginfo_codes, sip->si_code);
 662         if (!code) {
 663                 switch (sip->si_signo) {
 664                 case SIGTRAP:
 665                         code = xlookup(sigtrap_codes, sip->si_code);
 666                         break;
 667                 case SIGCHLD:
 668                         code = xlookup(sigchld_codes, sip->si_code);
 669                         break;
 670                 case SIGPOLL:
 671                         code = xlookup(sigpoll_codes, sip->si_code);
 672                         break;
 673                 case SIGPROF:
 674                         code = xlookup(sigprof_codes, sip->si_code);
 675                         break;
 676                 case SIGILL:
 677                         code = xlookup(sigill_codes, sip->si_code);
 678                         break;
 679 #ifdef SIGEMT
 680                 case SIGEMT:
 681                         code = xlookup(sigemt_codes, sip->si_code);
 682                         break;
 683 #endif
 684                 case SIGFPE:
 685                         code = xlookup(sigfpe_codes, sip->si_code);
 686                         break;
 687                 case SIGSEGV:
 688                         code = xlookup(sigsegv_codes, sip->si_code);
 689                         break;
 690                 case SIGBUS:
 691                         code = xlookup(sigbus_codes, sip->si_code);
 692                         break;
 693                 }
 694         }
 695         if (code)
 696                 tprintf(", si_code=%s", code);
 697         else
 698                 tprintf(", si_code=%#x", sip->si_code);
 699 #ifdef SI_NOINFO
 700         if (sip->si_code != SI_NOINFO)
 701 #endif
 702         {
 703                 if (sip->si_errno) {
 704                         if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
 705                                 tprintf(", si_errno=%d", sip->si_errno);
 706                         else
 707                                 tprintf(", si_errno=%s",
 708                                         errnoent[sip->si_errno]);
 709                 }
 710 #ifdef SI_FROMUSER
 711                 if (SI_FROMUSER(sip)) {
 712                         tprintf(", si_pid=%ld, si_uid=%ld",
 713                                 sip->si_pid, sip->si_uid);
 714 #ifdef SI_QUEUE
 715                         switch (sip->si_code) {
 716                         case SI_QUEUE:
 717 #ifdef SI_TIMER
 718                         case SI_TIMER:
 719 #endif /* SI_QUEUE */
 720                         case SI_ASYNCIO:
 721 #ifdef SI_MESGQ
 722                         case SI_MESGQ:
 723 #endif /* SI_MESGQ */
 724                                 tprintf(", si_value=%d",
 725                                         sip->si_value.sival_int);
 726                                 break;
 727                         }
 728 #endif /* SI_QUEUE */
 729                 }
 730                 else
 731 #endif /* SI_FROMUSER */
 732                 {
 733                         switch (sip->si_signo) {
 734                         case SIGCHLD:
 735                                 tprintf(", si_pid=%ld, si_status=",
 736                                         (long) sip->si_pid);
 737                                 if (sip->si_code == CLD_EXITED)
 738                                         tprintf("%d", sip->si_status);
 739                                 else
 740                                         printsignal(sip->si_status);
 741 #if LINUX
 742                                 if (!verbose)
 743                                         tprintf(", ...");
 744                                 else
 745                                         tprintf(", si_utime=%lu, si_stime=%lu",
 746                                                 sip->si_utime,
 747                                                 sip->si_stime);
 748 #endif
 749                                 break;
 750                         case SIGILL: case SIGFPE:
 751                         case SIGSEGV: case SIGBUS:
 752                                 tprintf(", si_addr=%#lx",
 753                                         (unsigned long) sip->si_addr);
 754                                 break;
 755                         case SIGPOLL:
 756                                 switch (sip->si_code) {
 757                                 case POLL_IN: case POLL_OUT: case POLL_MSG:
 758                                         tprintf(", si_band=%ld",
 759                                                 (long) sip->si_band);
 760                                         break;
 761                                 }
 762                                 break;
 763 #ifdef LINUX
 764                         default:
 765                                 tprintf(", si_pid=%lu, si_uid=%lu, ",
 766                                         (unsigned long) sip->si_pid,
 767                                         (unsigned long) sip->si_uid);
 768                                 if (!verbose)
 769                                         tprintf("...");
 770                                 else {
 771                                         tprintf("si_value={int=%u, ptr=%#lx}",
 772                                                 sip->si_int,
 773                                                 (unsigned long) sip->si_ptr);
 774                                 }
 775 #endif
 776
 777                         }
 778                 }
 779         }
 780         tprintf("}");
 781 }
 782
 783 #endif /* SVR4 || LINUX */
 784
 785 #ifdef LINUX
 786
 787 static void
 788 parse_sigset_t (const char *str, sigset_t *set)
 789 {
 790         const char *p;
 791         unsigned int digit;
 792         int i;
 793
 794         sigemptyset(set);
 795
 796         p = strchr(str, '\n');
 797         if (p == NULL)
 798                 p = strchr(str, '\0');
 799         for (i = 0; p-- > str; i += 4) {
 800                 if (*p >= '0' && *p <= '9')
 801                         digit = *p - '0';
 802                 else if (*p >= 'a' && *p <= 'f')
 803                         digit = *p - 'a' + 10;
 804                 else if (*p >= 'A' && *p <= 'F')
 805                         digit = *p - 'A' + 10;
 806                 else
 807                         break;
 808                 if (digit & 1)
 809                         sigaddset(set, i + 1);
 810                 if (digit & 2)
 811                         sigaddset(set, i + 2);
 812                 if (digit & 4)
 813                         sigaddset(set, i + 3);
 814                 if (digit & 8)
 815                         sigaddset(set, i + 4);
 816         }
 817 }
 818
 819 #endif
 820
 821 /*
 822  * Check process TCP for the disposition of signal SIG.
 823  * Return 1 if the process would somehow manage to  survive signal SIG,
 824  * else return 0.  This routine will never be called with SIGKILL.
 825  */
 826 int
 827 sigishandled(tcp, sig)
 828 struct tcb *tcp;
 829 int sig;
 830 {
 831 #ifdef LINUX
 832         int sfd;
 833         char sname[32];
 834         char buf[2048];
 835         char *s;
 836         int i;
 837         sigset_t ignored, caught;
 838 #endif
 839 #ifdef SVR4
 840         /*
 841          * Since procfs doesn't interfere with wait I think it is safe
 842          * to punt on this question.  If not, the information is there.
 843          */
 844         return 1;
 845 #else /* !SVR4 */
 846         switch (sig) {
 847         case SIGCONT:
 848         case SIGSTOP:
 849         case SIGTSTP:
 850         case SIGTTIN:
 851         case SIGTTOU:
 852         case SIGCHLD:
 853         case SIGIO:
 854 #if defined(SIGURG) && SIGURG != SIGIO
 855         case SIGURG:
 856 #endif
 857         case SIGWINCH:
 858                 /* Gloria Gaynor says ... */
 859                 return 1;
 860         default:
 861                 break;
 862         }
 863 #endif /* !SVR4 */
 864 #ifdef LINUX
 865
 866         /* This is incredibly costly but it's worth it. */
 867         /* NOTE: LinuxThreads internally uses SIGRTMIN, SIGRTMIN + 1 and
 868            SIGRTMIN + 2, so we can't use the obsolete /proc/%d/stat which
 869            doesn't handle real-time signals). */
 870         sprintf(sname, "/proc/%d/status", tcp->pid);
 871         if ((sfd = open(sname, O_RDONLY)) == -1) {
 872                 perror(sname);
 873                 return 1;
 874         }
 875         i = read(sfd, buf, sizeof(buf));
 876         buf[i] = '\0';
 877         close(sfd);
 878         /*
 879          * Skip the extraneous fields. We need to skip
 880          * command name has any spaces in it.  So be it.
 881          */
 882         s = strstr(buf, "SigIgn:\t");
 883         if (!s)
 884         {
 885                 fprintf(stderr, "/proc/pid/status format error\n");
 886                 return 1;
 887         }
 888         parse_sigset_t(s + 8, &ignored);
 889
 890         s = strstr(buf, "SigCgt:\t");
 891         if (!s)
 892         {
 893                 fprintf(stderr, "/proc/pid/status format error\n");
 894                 return 1;
 895         }
 896         parse_sigset_t(s + 8, &caught);
 897
 898 #ifdef DEBUG
 899         fprintf(stderr, "sigs: %016qx %016qx (sig=%d)\n",
 900                 *(long long *) &ignored, *(long long *) &caught, sig);
 901 #endif
 902         if (sigismember(&ignored, sig) || sigismember(&caught, sig))
 903                 return 1;
 904 #endif /* LINUX */
 905
 906 #ifdef SUNOS4
 907         void (*u_signal)();
 908
 909         if (upeek(tcp, uoff(u_signal[0]) + sig*sizeof(u_signal),
 910             (long *) &u_signal) < 0) {
 911                 return 0;
 912         }
 913         if (u_signal != SIG_DFL)
 914                 return 1;
 915 #endif /* SUNOS4 */
 916
 917         return 0;
 918 }
 919
 920 #if defined(SUNOS4) || defined(FREEBSD)
 921
 922 int
 923 sys_sigvec(tcp)
 924 struct tcb *tcp;
 925 {
 926         struct sigvec sv;
 927         long addr;
 928
 929         if (entering(tcp)) {
 930                 printsignal(tcp->u_arg[0]);
 931                 tprintf(", ");
 932                 addr = tcp->u_arg[1];
 933         } else {
 934                 addr = tcp->u_arg[2];
 935         }
 936         if (addr == 0)
 937                 tprintf("NULL");
 938         else if (!verbose(tcp))
 939                 tprintf("%#lx", addr);
 940         else if (umove(tcp, addr, &sv) < 0)
 941                 tprintf("{...}");
 942         else {
 943                 switch ((int) sv.sv_handler) {
 944                 case (int) SIG_ERR:
 945                         tprintf("{SIG_ERR}");
 946                         break;
 947                 case (int) SIG_DFL:
 948                         tprintf("{SIG_DFL}");
 949                         break;
 950                 case (int) SIG_IGN:
 951                         if (tcp->u_arg[0] == SIGTRAP) {
 952                                 tcp->flags |= TCB_SIGTRAPPED;
 953                                 kill(tcp->pid, SIGSTOP);
 954                         }
 955                         tprintf("{SIG_IGN}");
 956                         break;
 957                 case (int) SIG_HOLD:
 958                         if (tcp->u_arg[0] == SIGTRAP) {
 959                                 tcp->flags |= TCB_SIGTRAPPED;
 960                                 kill(tcp->pid, SIGSTOP);
 961                         }
 962                         tprintf("SIG_HOLD");
 963                         break;
 964                 default:
 965                         if (tcp->u_arg[0] == SIGTRAP) {
 966                                 tcp->flags |= TCB_SIGTRAPPED;
 967                                 kill(tcp->pid, SIGSTOP);
 968                         }
 969                         tprintf("{%#lx, ", (unsigned long) sv.sv_handler);
 970                         printsigmask(&sv.sv_mask, 0);
 971                         tprintf(", ");
 972                         printflags(sigvec_flags, sv.sv_flags, "SV_???");
 973                         tprintf("}");
 974                 }
 975         }
 976         if (entering(tcp))
 977                 tprintf(", ");
 978         return 0;
 979 }
 980
 981 int
 982 sys_sigpause(tcp)
 983 struct tcb *tcp;
 984 {
 985         if (entering(tcp)) {    /* WTA: UD had a bug here: he forgot the braces */
 986                 sigset_t sigm;
 987                 long_to_sigset(tcp->u_arg[0], &sigm);
 988                 printsigmask(&sigm, 0);
 989         }
 990         return 0;
 991 }
 992
 993 int
 994 sys_sigstack(tcp)
 995 struct tcb *tcp;
 996 {
 997         struct sigstack ss;
 998         long addr;
 999
1000         if (entering(tcp))
1001                 addr = tcp->u_arg[0];
1002         else
1003                 addr = tcp->u_arg[1];
1004         if (addr == 0)
1005                 tprintf("NULL");
1006         else if (umove(tcp, addr, &ss) < 0)
1007                 tprintf("%#lx", addr);
1008         else {
1009                 tprintf("{ss_sp %#lx ", (unsigned long) ss.ss_sp);
1010                 tprintf("ss_onstack %s}", ss.ss_onstack ? "YES" : "NO");
1011         }
1012         if (entering(tcp))
1013                 tprintf(", ");
1014         return 0;
1015 }
1016
1017 int
1018 sys_sigcleanup(tcp)
1019 struct tcb *tcp;
1020 {
1021         return 0;
1022 }
1023
1024 #endif /* SUNOS4 || FREEBSD */
1025
1026 #ifndef SVR4
1027
1028 int
1029 sys_sigsetmask(tcp)
1030 struct tcb *tcp;
1031 {
1032         if (entering(tcp)) {
1033                 sigset_t sigm;
1034                 long_to_sigset(tcp->u_arg[0], &sigm);
1035                 printsigmask(&sigm, 0);
1036 #ifndef USE_PROCFS
1037                 if ((tcp->u_arg[0] & sigmask(SIGTRAP))) {
1038                         /* Mark attempt to block SIGTRAP */
1039                         tcp->flags |= TCB_SIGTRAPPED;
1040                         /* Send unblockable signal */
1041                         kill(tcp->pid, SIGSTOP);
1042                 }
1043 #endif /* !USE_PROCFS */
1044         }
1045         else if (!syserror(tcp)) {
1046                 sigset_t sigm;
1047                 long_to_sigset(tcp->u_rval, &sigm);
1048                 tcp->auxstr = sprintsigmask("old mask ", &sigm, 0);
1049
1050                 return RVAL_HEX | RVAL_STR;
1051         }
1052         return 0;
1053 }
1054
1055 #if defined(SUNOS4) || defined(FREEBSD)
1056 int
1057 sys_sigblock(tcp)
1058 struct tcb *tcp;
1059 {
1060         return sys_sigsetmask(tcp);
1061 }
1062 #endif /* SUNOS4 || FREEBSD */
1063
1064 #endif /* !SVR4 */
1065
1066 #ifdef HAVE_SIGACTION
1067
1068 #ifdef LINUX
1069 struct old_sigaction {
1070         __sighandler_t __sa_handler;
1071         unsigned long sa_mask;
1072         unsigned long sa_flags;
1073         void (*sa_restorer)(void);
1074 };
1075 #define SA_HANDLER __sa_handler
1076 #endif /* LINUX */
1077
1078 #ifndef SA_HANDLER
1079 #define SA_HANDLER sa_handler
1080 #endif
1081
1082 int
1083 sys_sigaction(tcp)
1084 struct tcb *tcp;
1085 {
1086         long addr;
1087 #ifdef LINUX
1088         sigset_t sigset;
1089         struct old_sigaction sa;
1090 #else
1091         struct sigaction sa;
1092 #endif
1093
1094
1095         if (entering(tcp)) {
1096                 printsignal(tcp->u_arg[0]);
1097                 tprintf(", ");
1098                 addr = tcp->u_arg[1];
1099         } else
1100                 addr = tcp->u_arg[2];
1101         if (addr == 0)
1102                 tprintf("NULL");
1103         else if (!verbose(tcp))
1104                 tprintf("%#lx", addr);
1105         else if (umove(tcp, addr, &sa) < 0)
1106                 tprintf("{...}");
1107         else {
1108                 /* Architectures using function pointers, like
1109                  * hppa, may need to manipulate the function pointer
1110                  * to compute the result of a comparison. However,
1111                  * the SA_HANDLER function pointer exists only in
1112                  * the address space of the traced process, and can't
1113                  * be manipulated by strace. In order to prevent the
1114                  * compiler from generating code to manipulate
1115                  * SA_HANDLER we cast the function pointers to long. */
1116                 if ((long)sa.SA_HANDLER == (long)SIG_ERR)
1117                         tprintf("{SIG_ERR, ");
1118                 else if ((long)sa.SA_HANDLER == (long)SIG_DFL)
1119                         tprintf("{SIG_DFL, ");
1120                 else if ((long)sa.SA_HANDLER == (long)SIG_IGN) {
1121 #ifndef USE_PROCFS
1122                         if (tcp->u_arg[0] == SIGTRAP) {
1123                                 tcp->flags |= TCB_SIGTRAPPED;
1124                                 kill(tcp->pid, SIGSTOP);
1125                         }
1126 #endif /* !USE_PROCFS */
1127                         tprintf("{SIG_IGN, ");
1128                 }
1129                 else {
1130 #ifndef USE_PROCFS
1131                         if (tcp->u_arg[0] == SIGTRAP) {
1132                                 tcp->flags |= TCB_SIGTRAPPED;
1133                                 kill(tcp->pid, SIGSTOP);
1134                         }
1135 #endif /* !USE_PROCFS */
1136                         tprintf("{%#lx, ", (long) sa.SA_HANDLER);
1137 #ifndef LINUX
1138                         printsigmask (&sa.sa_mask, 0);
1139 #else
1140                         long_to_sigset(sa.sa_mask, &sigset);
1141                         printsigmask(&sigset, 0);
1142 #endif
1143                         tprintf(", ");
1144                         printflags(sigact_flags, sa.sa_flags, "SA_???");
1145 #ifdef SA_RESTORER
1146                         if (sa.sa_flags & SA_RESTORER)
1147                                 tprintf(", %p", sa.sa_restorer);
1148 #endif
1149                         tprintf("}");
1150                 }
1151         }
1152         if (entering(tcp))
1153                 tprintf(", ");
1154 #ifdef LINUX
1155         else
1156                 tprintf(", %#lx", (unsigned long) sa.sa_restorer);
1157 #endif
1158         return 0;
1159 }
1160
1161 int
1162 sys_signal(tcp)
1163 struct tcb *tcp;
1164 {
1165         if (entering(tcp)) {
1166                 printsignal(tcp->u_arg[0]);
1167                 tprintf(", ");
1168                 switch (tcp->u_arg[1]) {
1169                 case (long) SIG_ERR:
1170                         tprintf("SIG_ERR");
1171                         break;
1172                 case (long) SIG_DFL:
1173                         tprintf("SIG_DFL");
1174                         break;
1175                 case (long) SIG_IGN:
1176 #ifndef USE_PROCFS
1177                         if (tcp->u_arg[0] == SIGTRAP) {
1178                                 tcp->flags |= TCB_SIGTRAPPED;
1179                                 kill(tcp->pid, SIGSTOP);
1180                         }
1181 #endif /* !USE_PROCFS */
1182                         tprintf("SIG_IGN");
1183                         break;
1184                 default:
1185 #ifndef USE_PROCFS
1186                         if (tcp->u_arg[0] == SIGTRAP) {
1187                                 tcp->flags |= TCB_SIGTRAPPED;
1188                                 kill(tcp->pid, SIGSTOP);
1189                         }
1190 #endif /* !USE_PROCFS */
1191                         tprintf("%#lx", tcp->u_arg[1]);
1192                 }
1193                 return 0;
1194         }
1195         else if (!syserror(tcp)) {
1196                 switch (tcp->u_rval) {
1197                     case (long) SIG_ERR:
1198                         tcp->auxstr = "SIG_ERR"; break;
1199                     case (long) SIG_DFL:
1200                         tcp->auxstr = "SIG_DFL"; break;
1201                     case (long) SIG_IGN:
1202                         tcp->auxstr = "SIG_IGN"; break;
1203                     default:
1204                         tcp->auxstr = NULL;
1205                 }
1206                 return RVAL_HEX | RVAL_STR;
1207         }
1208         return 0;
1209 }
1210
1211 #ifdef SVR4
1212 int
1213 sys_sighold(tcp)
1214 struct tcb *tcp;
1215 {
1216         if (entering(tcp)) {
1217                 printsignal(tcp->u_arg[0]);
1218         }
1219         return 0;
1220 }
1221 #endif /* SVR4 */
1222
1223 #endif /* HAVE_SIGACTION */
1224
1225 #ifdef LINUX
1226
1227 int
1228 sys_sigreturn(struct tcb *tcp)
1229 {
1230 #if defined(ARM)
1231         struct pt_regs regs;
1232         struct sigcontext_struct sc;
1233
1234         if (entering(tcp)) {
1235                 tcp->u_arg[0] = 0;
1236
1237                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)&regs) == -1)
1238                         return 0;
1239
1240                 if (umove(tcp, regs.ARM_sp, &sc) < 0)
1241                         return 0;
1242
1243                 tcp->u_arg[0] = 1;
1244                 tcp->u_arg[1] = sc.oldmask;
1245         } else {
1246                 sigset_t sigm;
1247                 long_to_sigset(tcp->u_arg[1], &sigm);
1248                 tcp->u_rval = tcp->u_error = 0;
1249                 if (tcp->u_arg[0] == 0)
1250                         return 0;
1251                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1252                 return RVAL_NONE | RVAL_STR;
1253         }
1254         return 0;
1255 #elif defined(S390) || defined(S390X)
1256         long usp;
1257         struct sigcontext_struct sc;
1258
1259         if (entering(tcp)) {
1260                 tcp->u_arg[0] = 0;
1261                 if (upeek(tcp,PT_GPR15,&usp)<0)
1262                         return 0;
1263                 if (umove(tcp, usp+__SIGNAL_FRAMESIZE, &sc) < 0)
1264                         return 0;
1265                 tcp->u_arg[0] = 1;
1266                 memcpy(&tcp->u_arg[1],&sc.oldmask[0],sizeof(sigset_t));
1267         } else {
1268                 tcp->u_rval = tcp->u_error = 0;
1269                 if (tcp->u_arg[0] == 0)
1270                         return 0;
1271                 tcp->auxstr = sprintsigmask("mask now ",(sigset_t *)&tcp->u_arg[1],0);
1272                 return RVAL_NONE | RVAL_STR;
1273         }
1274         return 0;
1275 #elif defined(I386)
1276         long esp;
1277         struct sigcontext_struct sc;
1278
1279         if (entering(tcp)) {
1280                 tcp->u_arg[0] = 0;
1281                 if (upeek(tcp, 4*UESP, &esp) < 0)
1282                         return 0;
1283                 if (umove(tcp, esp, &sc) < 0)
1284                         return 0;
1285                 tcp->u_arg[0] = 1;
1286                 tcp->u_arg[1] = sc.oldmask;
1287         }
1288         else {
1289                 sigset_t sigm;
1290                 long_to_sigset(tcp->u_arg[1], &sigm);
1291                 tcp->u_rval = tcp->u_error = 0;
1292                 if (tcp->u_arg[0] == 0)
1293                         return 0;
1294                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1295                 return RVAL_NONE | RVAL_STR;
1296         }
1297         return 0;
1298 #elif defined(IA64)
1299         struct sigcontext sc;
1300         long sp;
1301
1302         if (entering(tcp)) {
1303                 /* offset of sigcontext in the kernel's sigframe structure: */
1304 #               define SIGFRAME_SC_OFFSET       0x90
1305                 tcp->u_arg[0] = 0;
1306                 if (upeek(tcp, PT_R12, &sp) < 0)
1307                         return 0;
1308                 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
1309                         return 0;
1310                 tcp->u_arg[0] = 1;
1311                 memcpy(tcp->u_arg + 1, &sc.sc_mask, sizeof(sc.sc_mask));
1312         }
1313         else {
1314                 sigset_t sigm;
1315
1316                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1317                 tcp->u_rval = tcp->u_error = 0;
1318                 if (tcp->u_arg[0] == 0)
1319                         return 0;
1320                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1321                 return RVAL_NONE | RVAL_STR;
1322         }
1323         return 0;
1324 #elif defined(POWERPC)
1325         long esp;
1326         struct sigcontext_struct sc;
1327
1328         if (entering(tcp)) {
1329                 tcp->u_arg[0] = 0;
1330                 if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
1331                         return 0;
1332                 /* Skip dummy stack frame. */
1333 #ifdef __powerpc64__
1334                 esp += 128;
1335 #else
1336                 esp += 64;
1337 #endif
1338                 if (umove(tcp, esp, &sc) < 0)
1339                         return 0;
1340                 tcp->u_arg[0] = 1;
1341                 tcp->u_arg[1] = sc.oldmask;
1342         }
1343         else {
1344                 sigset_t sigm;
1345                 long_to_sigset(tcp->u_arg[1], &sigm);
1346                 tcp->u_rval = tcp->u_error = 0;
1347                 if (tcp->u_arg[0] == 0)
1348                         return 0;
1349                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1350                 return RVAL_NONE | RVAL_STR;
1351         }
1352         return 0;
1353 #elif defined(M68K)
1354         long usp;
1355         struct sigcontext sc;
1356
1357         if (entering(tcp)) {
1358                 tcp->u_arg[0] = 0;
1359                 if (upeek(tcp, 4*PT_USP, &usp) < 0)
1360                         return 0;
1361                 if (umove(tcp, usp, &sc) < 0)
1362                         return 0;
1363                 tcp->u_arg[0] = 1;
1364                 tcp->u_arg[1] = sc.sc_mask;
1365         }
1366         else {
1367                 sigset_t sigm;
1368                 long_to_sigset(tcp->u_arg[1], &sigm);
1369                 tcp->u_rval = tcp->u_error = 0;
1370                 if (tcp->u_arg[0] == 0)
1371                         return 0;
1372                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1373                 return RVAL_NONE | RVAL_STR;
1374         }
1375         return 0;
1376 #elif defined(ALPHA)
1377         long fp;
1378         struct sigcontext_struct sc;
1379
1380         if (entering(tcp)) {
1381                 tcp->u_arg[0] = 0;
1382                 if (upeek(tcp, REG_FP, &fp) < 0)
1383                         return 0;
1384                 if (umove(tcp, fp, &sc) < 0)
1385                         return 0;
1386                 tcp->u_arg[0] = 1;
1387                 tcp->u_arg[1] = sc.sc_mask;
1388         }
1389         else {
1390                 sigset_t sigm;
1391                 long_to_sigset(tcp->u_arg[1], &sigm);
1392                 tcp->u_rval = tcp->u_error = 0;
1393                 if (tcp->u_arg[0] == 0)
1394                         return 0;
1395                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1396                 return RVAL_NONE | RVAL_STR;
1397         }
1398         return 0;
1399 #elif defined (SPARC) || defined (SPARC64)
1400         long i1;
1401         struct pt_regs regs;
1402         m_siginfo_t si;
1403
1404         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1405                 perror("sigreturn: PTRACE_GETREGS ");
1406                 return 0;
1407         }
1408         if(entering(tcp)) {
1409                 tcp->u_arg[0] = 0;
1410                 i1 = regs.u_regs[U_REG_O1];
1411                 if(umove(tcp, i1, &si) < 0) {
1412                         perror("sigreturn: umove ");
1413                         return 0;
1414                 }
1415                 tcp->u_arg[0] = 1;
1416                 tcp->u_arg[1] = si.si_mask;
1417         } else {
1418                 sigset_t sigm;
1419                 long_to_sigset(tcp->u_arg[1], &sigm);
1420                 tcp->u_rval = tcp->u_error = 0;
1421                 if(tcp->u_arg[0] == 0)
1422                         return 0;
1423                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1424                 return RVAL_NONE | RVAL_STR;
1425         }
1426         return 0;
1427 #elif defined (LINUX_MIPSN32) || defined (LINUX_MIPSN64)
1428         /* This decodes rt_sigreturn.  The 64-bit ABIs do not have
1429            sigreturn.  */
1430         long sp;
1431         struct ucontext uc;
1432
1433         if(entering(tcp)) {
1434                 tcp->u_arg[0] = 0;
1435                 if (upeek(tcp, REG_SP, &sp) < 0)
1436                         return 0;
1437                 /* There are six words followed by a 128-byte siginfo.  */
1438                 sp = sp + 6 * 4 + 128;
1439                 if (umove(tcp, sp, &uc) < 0)
1440                         return 0;
1441                 tcp->u_arg[0] = 1;
1442                 tcp->u_arg[1] = *(long *) &uc.uc_sigmask;
1443         } else {
1444                 sigset_t sigm;
1445                 long_to_sigset(tcp->u_arg[1], &sigm);
1446                 tcp->u_rval = tcp->u_error = 0;
1447                 if(tcp->u_arg[0] == 0)
1448                         return 0;
1449                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1450                 return RVAL_NONE | RVAL_STR;
1451         }
1452         return 0;
1453 #elif defined(MIPS)
1454         long sp;
1455         struct pt_regs regs;
1456         m_siginfo_t si;
1457
1458         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1459                 perror("sigreturn: PTRACE_GETREGS ");
1460                 return 0;
1461         }
1462         if(entering(tcp)) {
1463                 tcp->u_arg[0] = 0;
1464                 sp = regs.regs[29];
1465                 if (umove(tcp, sp, &si) < 0)
1466                 tcp->u_arg[0] = 1;
1467                 tcp->u_arg[1] = si.si_mask;
1468         } else {
1469                 sigset_t sigm;
1470                 long_to_sigset(tcp->u_arg[1], &sigm);
1471                 tcp->u_rval = tcp->u_error = 0;
1472                 if(tcp->u_arg[0] == 0)
1473                         return 0;
1474                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1475                 return RVAL_NONE | RVAL_STR;
1476         }
1477         return 0;
1478 #elif defined(CRISV10) || defined(CRISV32)
1479         struct sigcontext sc;
1480
1481         if (entering(tcp)) {
1482                 long regs[PT_MAX+1];
1483
1484                 tcp->u_arg[0] = 0;
1485
1486                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
1487                         perror("sigreturn: PTRACE_GETREGS");
1488                         return 0;
1489                 }
1490                 if (umove(tcp, regs[PT_USP], &sc) < 0)
1491                         return 0;
1492                 tcp->u_arg[0] = 1;
1493                 tcp->u_arg[1] = sc.oldmask;
1494         } else {
1495                 sigset_t sigm;
1496                 long_to_sigset(tcp->u_arg[1], &sigm);
1497                 tcp->u_rval = tcp->u_error = 0;
1498
1499                 if (tcp->u_arg[0] == 0)
1500                         return 0;
1501                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1502                 return RVAL_NONE | RVAL_STR;
1503         }
1504         return 0;
1505 #elif defined(TILE)
1506         struct ucontext uc;
1507         long sp;
1508
1509         /* offset of ucontext in the kernel's sigframe structure */
1510 #       define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(struct siginfo)
1511
1512         if (entering(tcp)) {
1513                 tcp->u_arg[0] = 0;
1514                 if (upeek(tcp, PTREGS_OFFSET_SP, &sp) < 0)
1515                         return 0;
1516                 if (umove(tcp, sp + SIGFRAME_UC_OFFSET, &uc) < 0)
1517                         return 0;
1518                 tcp->u_arg[0] = 1;
1519                 memcpy(tcp->u_arg + 1, &uc.uc_sigmask, sizeof(uc.uc_sigmask));
1520         }
1521         else {
1522                 sigset_t sigm;
1523
1524                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1525                 tcp->u_rval = tcp->u_error = 0;
1526                 if (tcp->u_arg[0] == 0)
1527                         return 0;
1528                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1529                 return RVAL_NONE | RVAL_STR;
1530         }
1531         return 0;
1532 #else
1533 #warning No sys_sigreturn() for this architecture
1534 #warning         (no problem, just a reminder :-)
1535         return 0;
1536 #endif
1537 }
1538
1539 int
1540 sys_siggetmask(tcp)
1541 struct tcb *tcp;
1542 {
1543         if (exiting(tcp)) {
1544                 sigset_t sigm;
1545                 long_to_sigset(tcp->u_rval, &sigm);
1546                 tcp->auxstr = sprintsigmask("mask ", &sigm, 0);
1547         }
1548         return RVAL_HEX | RVAL_STR;
1549 }
1550
1551 int
1552 sys_sigsuspend(struct tcb *tcp)
1553 {
1554         if (entering(tcp)) {
1555                 sigset_t sigm;
1556                 long_to_sigset(tcp->u_arg[2], &sigm);
1557                 printsigmask(&sigm, 0);
1558         }
1559         return 0;
1560 }
1561
1562 #endif /* LINUX */
1563
1564 #if defined(SVR4) || defined(FREEBSD)
1565
1566 int
1567 sys_sigsuspend(tcp)
1568 struct tcb *tcp;
1569 {
1570         sigset_t sigset;
1571
1572         if (entering(tcp)) {
1573                 if (umove(tcp, tcp->u_arg[0], &sigset) < 0)
1574                         tprintf("[?]");
1575                 else
1576                         printsigmask(&sigset, 0);
1577         }
1578         return 0;
1579 }
1580 #ifndef FREEBSD
1581 static const struct xlat ucontext_flags[] = {
1582         { UC_SIGMASK,   "UC_SIGMASK"    },
1583         { UC_STACK,     "UC_STACK"      },
1584         { UC_CPU,       "UC_CPU"        },
1585 #ifdef UC_FPU
1586         { UC_FPU,       "UC_FPU"        },
1587 #endif
1588 #ifdef UC_INTR
1589         { UC_INTR,      "UC_INTR"       },
1590 #endif
1591         { 0,            NULL            },
1592 };
1593 #endif /* !FREEBSD */
1594 #endif /* SVR4 || FREEBSD */
1595
1596 #if defined SVR4 || defined LINUX || defined FREEBSD
1597 #if defined LINUX && !defined SS_ONSTACK
1598 #define SS_ONSTACK      1
1599 #define SS_DISABLE      2
1600 #if __GLIBC_MINOR__ == 0
1601 typedef struct
1602 {
1603         __ptr_t ss_sp;
1604         int ss_flags;
1605         size_t ss_size;
1606 } stack_t;
1607 #endif
1608 #endif
1609 #ifdef FREEBSD
1610 #define stack_t struct sigaltstack
1611 #endif
1612
1613 static const struct xlat sigaltstack_flags[] = {
1614         { SS_ONSTACK,   "SS_ONSTACK"    },
1615         { SS_DISABLE,   "SS_DISABLE"    },
1616         { 0,            NULL            },
1617 };
1618 #endif
1619
1620 #ifdef SVR4
1621 static void
1622 printcontext(tcp, ucp)
1623 struct tcb *tcp;
1624 ucontext_t *ucp;
1625 {
1626         tprintf("{");
1627         if (!abbrev(tcp)) {
1628                 tprintf("uc_flags=");
1629                 printflags(ucontext_flags, ucp->uc_flags, "UC_???");
1630                 tprintf(", uc_link=%#lx, ", (unsigned long) ucp->uc_link);
1631         }
1632         tprintf("uc_sigmask=");
1633         printsigmask(&ucp->uc_sigmask, 0);
1634         if (!abbrev(tcp)) {
1635                 tprintf(", uc_stack={ss_sp=%#lx, ss_size=%d, ss_flags=",
1636                         (unsigned long) ucp->uc_stack.ss_sp,
1637                         ucp->uc_stack.ss_size);
1638                 printflags(sigaltstack_flags, ucp->uc_stack.ss_flags, "SS_???");
1639                 tprintf("}");
1640         }
1641         tprintf(", ...}");
1642 }
1643
1644 int
1645 sys_getcontext(tcp)
1646 struct tcb *tcp;
1647 {
1648         ucontext_t uc;
1649
1650         if (exiting(tcp)) {
1651                 if (tcp->u_error)
1652                         tprintf("%#lx", tcp->u_arg[0]);
1653                 else if (!tcp->u_arg[0])
1654                         tprintf("NULL");
1655                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1656                         tprintf("{...}");
1657                 else
1658                         printcontext(tcp, &uc);
1659         }
1660         return 0;
1661 }
1662
1663 int
1664 sys_setcontext(tcp)
1665 struct tcb *tcp;
1666 {
1667         ucontext_t uc;
1668
1669         if (entering(tcp)) {
1670                 if (!tcp->u_arg[0])
1671                         tprintf("NULL");
1672                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1673                         tprintf("{...}");
1674                 else
1675                         printcontext(tcp, &uc);
1676         }
1677         else {
1678                 tcp->u_rval = tcp->u_error = 0;
1679                 if (tcp->u_arg[0] == 0)
1680                         return 0;
1681                 return RVAL_NONE;
1682         }
1683         return 0;
1684 }
1685
1686 #endif /* SVR4 */
1687
1688 #if defined(LINUX) || defined(FREEBSD)
1689
1690 static int
1691 print_stack_t(tcp, addr)
1692 struct tcb *tcp;
1693 unsigned long addr;
1694 {
1695         stack_t ss;
1696         if (umove(tcp, addr, &ss) < 0)
1697                 return -1;
1698         tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1699         printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1700         tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1701         return 0;
1702 }
1703
1704 int
1705 sys_sigaltstack(tcp)
1706         struct tcb *tcp;
1707 {
1708         if (entering(tcp)) {
1709                 if (tcp->u_arg[0] == 0)
1710                         tprintf("NULL");
1711                 else if (print_stack_t(tcp, tcp->u_arg[0]) < 0)
1712                         return -1;
1713         }
1714         else {
1715                 tprintf(", ");
1716                 if (tcp->u_arg[1] == 0)
1717                         tprintf("NULL");
1718                 else if (print_stack_t(tcp, tcp->u_arg[1]) < 0)
1719                         return -1;
1720         }
1721         return 0;
1722 }
1723 #endif
1724
1725 #ifdef HAVE_SIGACTION
1726
1727 int
1728 sys_sigprocmask(tcp)
1729 struct tcb *tcp;
1730 {
1731 #ifdef ALPHA
1732         if (entering(tcp)) {
1733                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1734                 tprintf(", ");
1735                 printsigmask(tcp->u_arg[1], 0);
1736         }
1737         else if (!syserror(tcp)) {
1738                 tcp->auxstr = sprintsigmask("old mask ", tcp->u_rval, 0);
1739                 return RVAL_HEX | RVAL_STR;
1740         }
1741 #else /* !ALPHA */
1742         if (entering(tcp)) {
1743 #ifdef SVR4
1744                 if (tcp->u_arg[0] == 0)
1745                         tprintf("0");
1746                 else
1747 #endif /* SVR4 */
1748                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1749                 tprintf(", ");
1750                 print_sigset(tcp, tcp->u_arg[1], 0);
1751                 tprintf(", ");
1752         }
1753         else {
1754                 if (!tcp->u_arg[2])
1755                         tprintf("NULL");
1756                 else if (syserror(tcp))
1757                         tprintf("%#lx", tcp->u_arg[2]);
1758                 else
1759                         print_sigset(tcp, tcp->u_arg[2], 0);
1760         }
1761 #endif /* !ALPHA */
1762         return 0;
1763 }
1764
1765 #endif /* HAVE_SIGACTION */
1766
1767 int
1768 sys_kill(tcp)
1769 struct tcb *tcp;
1770 {
1771         if (entering(tcp)) {
1772                 /*
1773                  * Sign-extend a 32-bit value when that's what it is.
1774                  */
1775                 long pid = tcp->u_arg[0];
1776                 if (personality_wordsize[current_personality] < sizeof pid)
1777                         pid = (long) (int) pid;
1778                 tprintf("%ld, %s", pid, signame(tcp->u_arg[1]));
1779         }
1780         return 0;
1781 }
1782
1783 #if defined(FREEBSD) || defined(SUNOS4)
1784 int
1785 sys_killpg(tcp)
1786 struct tcb *tcp;
1787 {
1788         return sys_kill(tcp);
1789 }
1790 #endif /* FREEBSD || SUNOS4 */
1791
1792 #ifdef LINUX
1793 int
1794 sys_tgkill(tcp)
1795         struct tcb *tcp;
1796 {
1797         if (entering(tcp)) {
1798                 tprintf("%ld, %ld, %s",
1799                         tcp->u_arg[0], tcp->u_arg[1], signame(tcp->u_arg[2]));
1800         }
1801         return 0;
1802 }
1803 #endif
1804
1805 int
1806 sys_sigpending(tcp)
1807 struct tcb *tcp;
1808 {
1809         sigset_t sigset;
1810
1811         if (exiting(tcp)) {
1812                 if (syserror(tcp))
1813                         tprintf("%#lx", tcp->u_arg[0]);
1814                 else if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1815                         tprintf("[?]");
1816                 else
1817                         printsigmask(&sigset, 0);
1818         }
1819         return 0;
1820 }
1821
1822 #ifdef SVR4
1823 int sys_sigwait(tcp)
1824 struct tcb *tcp;
1825 {
1826         sigset_t sigset;
1827
1828         if (entering(tcp)) {
1829                 if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1830                         tprintf("[?]");
1831                 else
1832                         printsigmask(&sigset, 0);
1833         }
1834         else {
1835                 if (!syserror(tcp)) {
1836                         tcp->auxstr = signalent[tcp->u_rval];
1837                         return RVAL_DECIMAL | RVAL_STR;
1838                 }
1839         }
1840         return 0;
1841 }
1842 #endif /* SVR4 */
1843
1844 #ifdef LINUX
1845
1846         int
1847 sys_rt_sigprocmask(tcp)
1848         struct tcb *tcp;
1849 {
1850         sigset_t sigset;
1851
1852         /* Note: arg[3] is the length of the sigset. */
1853         if (entering(tcp)) {
1854                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1855                 tprintf(", ");
1856                 if (!tcp->u_arg[1])
1857                         tprintf("NULL, ");
1858                 else if (copy_sigset_len(tcp, tcp->u_arg[1], &sigset, tcp->u_arg[3]) < 0)
1859                         tprintf("%#lx, ", tcp->u_arg[1]);
1860                 else {
1861                         printsigmask(&sigset, 1);
1862                         tprintf(", ");
1863                 }
1864         }
1865         else {
1866                 if (!tcp->u_arg[2])
1867
1868                         tprintf("NULL");
1869                 else if (syserror(tcp))
1870                         tprintf("%#lx", tcp->u_arg[2]);
1871                 else if (copy_sigset_len(tcp, tcp->u_arg[2], &sigset, tcp->u_arg[3]) < 0)
1872                         tprintf("[?]");
1873                 else
1874                         printsigmask(&sigset, 1);
1875                 tprintf(", %lu", tcp->u_arg[3]);
1876         }
1877         return 0;
1878 }
1879
1880
1881 /* Structure describing the action to be taken when a signal arrives.  */
1882 struct new_sigaction
1883 {
1884         __sighandler_t __sa_handler;
1885         unsigned long sa_flags;
1886         void (*sa_restorer) (void);
1887         /* Kernel treats sa_mask as an array of longs. */
1888         unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1889 };
1890 /* Same for i386-on-x86_64 and similar cases */
1891 struct new_sigaction32
1892 {
1893         uint32_t __sa_handler;
1894         uint32_t sa_flags;
1895         uint32_t sa_restorer;
1896         uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1897 };
1898
1899
1900 int
1901 sys_rt_sigaction(struct tcb *tcp)
1902 {
1903         struct new_sigaction sa;
1904         sigset_t sigset;
1905         long addr;
1906         int r;
1907
1908         if (entering(tcp)) {
1909                 printsignal(tcp->u_arg[0]);
1910                 tprintf(", ");
1911                 addr = tcp->u_arg[1];
1912         } else
1913                 addr = tcp->u_arg[2];
1914
1915         if (addr == 0) {
1916                 tprintf("NULL");
1917                 goto after_sa;
1918         }
1919         if (!verbose(tcp)) {
1920                 tprintf("%#lx", addr);
1921                 goto after_sa;
1922         }
1923 #if SUPPORTED_PERSONALITIES > 1
1924         if (personality_wordsize[current_personality] != sizeof(sa.sa_flags)
1925          && personality_wordsize[current_personality] == 4
1926         ) {
1927                 struct new_sigaction32 sa32;
1928                 r = umove(tcp, addr, &sa32);
1929                 if (r >= 0) {
1930                         memset(&sa, 0, sizeof(sa));
1931                         sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1932                         sa.sa_flags     = sa32.sa_flags;
1933                         sa.sa_restorer  = (void*)(unsigned long)sa32.sa_restorer;
1934                         /* Kernel treats sa_mask as an array of longs.
1935                          * For 32-bit process, "long" is uint32_t, thus, for example,
1936                          * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1937                          * But for (64-bit) kernel, 32th bit in sa_mask is
1938                          * 32th bit in 0th (64-bit) long!
1939                          * For little-endian, it's the same.
1940                          * For big-endian, we swap 32-bit words.
1941                          */
1942                         sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1943                 }
1944         } else
1945 #endif
1946         {
1947                 r = umove(tcp, addr, &sa);
1948         }
1949         if (r < 0) {
1950                 tprintf("{...}");
1951                 goto after_sa;
1952         }
1953         /* Architectures using function pointers, like
1954          * hppa, may need to manipulate the function pointer
1955          * to compute the result of a comparison. However,
1956          * the SA_HANDLER function pointer exists only in
1957          * the address space of the traced process, and can't
1958          * be manipulated by strace. In order to prevent the
1959          * compiler from generating code to manipulate
1960          * SA_HANDLER we cast the function pointers to long. */
1961         if ((long)sa.__sa_handler == (long)SIG_ERR)
1962                 tprintf("{SIG_ERR, ");
1963         else if ((long)sa.__sa_handler == (long)SIG_DFL)
1964                 tprintf("{SIG_DFL, ");
1965         else if ((long)sa.__sa_handler == (long)SIG_IGN)
1966                 tprintf("{SIG_IGN, ");
1967         else
1968                 tprintf("{%#lx, ", (long) sa.__sa_handler);
1969         /* Questionable code below.
1970          * Kernel won't handle sys_rt_sigaction
1971          * with wrong sigset size (just returns EINVAL)
1972          * therefore tcp->u_arg[3(4)] _must_ be NSIG / 8 here,
1973          * and we always use smaller memcpy. */
1974         sigemptyset(&sigset);
1975 #ifdef LINUXSPARC
1976         if (tcp->u_arg[4] <= sizeof(sigset))
1977                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[4]);
1978 #else
1979         if (tcp->u_arg[3] <= sizeof(sigset))
1980                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[3]);
1981 #endif
1982         else
1983                 memcpy(&sigset, &sa.sa_mask, sizeof(sigset));
1984         printsigmask(&sigset, 1);
1985         tprintf(", ");
1986         printflags(sigact_flags, sa.sa_flags, "SA_???");
1987 #ifdef SA_RESTORER
1988         if (sa.sa_flags & SA_RESTORER)
1989                 tprintf(", %p", sa.sa_restorer);
1990 #endif
1991         tprintf("}");
1992
1993  after_sa:
1994         if (entering(tcp))
1995                 tprintf(", ");
1996         else
1997 #ifdef LINUXSPARC
1998                 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
1999 #elif defined(ALPHA)
2000                 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
2001 #else
2002                 tprintf(", %lu", tcp->u_arg[3]);
2003 #endif
2004         return 0;
2005 }
2006
2007 int
2008 sys_rt_sigpending(struct tcb *tcp)
2009 {
2010         sigset_t sigset;
2011
2012         if (exiting(tcp)) {
2013                 if (syserror(tcp))
2014                         tprintf("%#lx", tcp->u_arg[0]);
2015                 else if (copy_sigset_len(tcp, tcp->u_arg[0],
2016                                          &sigset, tcp->u_arg[1]) < 0)
2017                         tprintf("[?]");
2018                 else
2019                         printsigmask(&sigset, 1);
2020         }
2021         return 0;
2022 }
2023
2024 int
2025 sys_rt_sigsuspend(struct tcb *tcp)
2026 {
2027         if (entering(tcp)) {
2028                 sigset_t sigm;
2029                 if (copy_sigset_len(tcp, tcp->u_arg[0], &sigm, tcp->u_arg[1]) < 0)
2030                         tprintf("[?]");
2031                 else
2032                         printsigmask(&sigm, 1);
2033         }
2034         return 0;
2035 }
2036
2037 int
2038 sys_rt_sigqueueinfo(struct tcb *tcp)
2039 {
2040         if (entering(tcp)) {
2041                 siginfo_t si;
2042                 tprintf("%lu, ", tcp->u_arg[0]);
2043                 printsignal(tcp->u_arg[1]);
2044                 tprintf(", ");
2045                 if (umove(tcp, tcp->u_arg[2], &si) < 0)
2046                         tprintf("%#lx", tcp->u_arg[2]);
2047                 else
2048                         printsiginfo(&si, verbose(tcp));
2049         }
2050         return 0;
2051 }
2052
2053 int sys_rt_sigtimedwait(struct tcb *tcp)
2054 {
2055         if (entering(tcp)) {
2056                 sigset_t sigset;
2057
2058                 if (copy_sigset_len(tcp, tcp->u_arg[0],
2059                                     &sigset, tcp->u_arg[3]) < 0)
2060                         tprintf("[?]");
2061                 else
2062                         printsigmask(&sigset, 1);
2063                 tprintf(", ");
2064                 /* This is the only "return" parameter, */
2065                 if (tcp->u_arg[1] != 0)
2066                         return 0;
2067                 /* ... if it's NULL, can decode all on entry */
2068                 tprintf("NULL, ");
2069         }
2070         else if (tcp->u_arg[1] != 0) {
2071                 /* syscall exit, and u_arg[1] wasn't NULL */
2072                 if (syserror(tcp))
2073                         tprintf("%#lx, ", tcp->u_arg[1]);
2074                 else {
2075                         siginfo_t si;
2076                         if (umove(tcp, tcp->u_arg[1], &si) < 0)
2077                                 tprintf("%#lx, ", tcp->u_arg[1]);
2078                         else {
2079                                 printsiginfo(&si, verbose(tcp));
2080                                 tprintf(", ");
2081                         }
2082                 }
2083         }
2084         else {
2085                 /* syscall exit, and u_arg[1] was NULL */
2086                 return 0;
2087         }
2088         print_timespec(tcp, tcp->u_arg[2]);
2089         tprintf(", %d", (int) tcp->u_arg[3]);
2090         return 0;
2091 };
2092
2093 int
2094 sys_restart_syscall(struct tcb *tcp)
2095 {
2096         if (entering(tcp))
2097                 tprintf("<... resuming interrupted call ...>");
2098         return 0;
2099 }
2100
2101 static int
2102 do_signalfd(struct tcb *tcp, int flags_arg)
2103 {
2104         if (entering(tcp)) {
2105                 tprintf("%ld, ", tcp->u_arg[0]);
2106                 print_sigset(tcp, tcp->u_arg[1], 1);
2107                 tprintf(", %lu", tcp->u_arg[2]);
2108                 if (flags_arg >= 0) {
2109                         tprintf(", ");
2110                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
2111                 }
2112         }
2113         return 0;
2114 }
2115
2116 int
2117 sys_signalfd(struct tcb *tcp)
2118 {
2119         return do_signalfd(tcp, -1);
2120 }
2121
2122 int
2123 sys_signalfd4(struct tcb *tcp)
2124 {
2125         return do_signalfd(tcp, 3);
2126 }
2127 #endif /* LINUX */