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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The name of the author may not be used to endorse or promote products
  20  *    derived from this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *      $Id$
  34  */
  35
  36 #include "defs.h"
  37
  38 #include <stdint.h>
  39 #include <signal.h>
  40 #include <sys/user.h>
  41 #include <fcntl.h>
  42
  43 #ifdef SVR4
  44 #include <sys/ucontext.h>
  45 #endif /* SVR4 */
  46
  47 #ifdef HAVE_SYS_REG_H
  48 # include <sys/reg.h>
  49 #ifndef PTRACE_PEEKUSR
  50 # define PTRACE_PEEKUSR PTRACE_PEEKUSER
  51 #endif
  52 #ifndef PTRACE_POKEUSR
  53 # define PTRACE_POKEUSR PTRACE_POKEUSER
  54 #endif
  55 #elif defined(HAVE_LINUX_PTRACE_H)
  56 #undef PTRACE_SYSCALL
  57 # ifdef HAVE_STRUCT_IA64_FPREG
  58 #  define ia64_fpreg XXX_ia64_fpreg
  59 # endif
  60 # ifdef HAVE_STRUCT_PT_ALL_USER_REGS
  61 #  define pt_all_user_regs XXX_pt_all_user_regs
  62 # endif
  63 #include <linux/ptrace.h>
  64 # undef ia64_fpreg
  65 # undef pt_all_user_regs
  66 #endif
  67
  68
  69 #ifdef LINUX
  70
  71 #ifdef IA64
  72 # include <asm/ptrace_offsets.h>
  73 #endif /* !IA64 */
  74
  75 #if defined (LINUX) && defined (SPARC64)
  76 # undef PTRACE_GETREGS
  77 # define PTRACE_GETREGS PTRACE_GETREGS64
  78 # undef PTRACE_SETREGS
  79 # define PTRACE_SETREGS PTRACE_SETREGS64
  80 #endif /* LINUX && SPARC64 */
  81
  82 #if defined (SPARC) || defined (SPARC64) || defined (MIPS)
  83 typedef struct {
  84         struct pt_regs          si_regs;
  85         int                     si_mask;
  86 } m_siginfo_t;
  87 #elif defined HAVE_ASM_SIGCONTEXT_H
  88 #if !defined(IA64) && !defined(X86_64)
  89 #include <asm/sigcontext.h>
  90 #endif /* !IA64 && !X86_64 */
  91 #else /* !HAVE_ASM_SIGCONTEXT_H */
  92 #if defined I386 && !defined HAVE_STRUCT_SIGCONTEXT_STRUCT
  93 struct sigcontext_struct {
  94         unsigned short gs, __gsh;
  95         unsigned short fs, __fsh;
  96         unsigned short es, __esh;
  97         unsigned short ds, __dsh;
  98         unsigned long edi;
  99         unsigned long esi;
 100         unsigned long ebp;
 101         unsigned long esp;
 102         unsigned long ebx;
 103         unsigned long edx;
 104         unsigned long ecx;
 105         unsigned long eax;
 106         unsigned long trapno;
 107         unsigned long err;
 108         unsigned long eip;
 109         unsigned short cs, __csh;
 110         unsigned long eflags;
 111         unsigned long esp_at_signal;
 112         unsigned short ss, __ssh;
 113         unsigned long i387;
 114         unsigned long oldmask;
 115         unsigned long cr2;
 116 };
 117 #else /* !I386 */
 118 #if defined M68K && !defined HAVE_STRUCT_SIGCONTEXT
 119 struct sigcontext
 120 {
 121         unsigned long sc_mask;
 122         unsigned long sc_usp;
 123         unsigned long sc_d0;
 124         unsigned long sc_d1;
 125         unsigned long sc_a0;
 126         unsigned long sc_a1;
 127         unsigned short sc_sr;
 128         unsigned long sc_pc;
 129         unsigned short sc_formatvec;
 130 };
 131 #endif /* M68K */
 132 #endif /* !I386 */
 133 #endif /* !HAVE_ASM_SIGCONTEXT_H */
 134 #ifndef NSIG
 135 #define NSIG 32
 136 #endif
 137 #ifdef ARM
 138 #undef NSIG
 139 #define NSIG 32
 140 #endif
 141 #endif /* LINUX */
 142
 143 const char *const signalent0[] = {
 144 #include "signalent.h"
 145 };
 146 const int nsignals0 = sizeof signalent0 / sizeof signalent0[0];
 147
 148 #if SUPPORTED_PERSONALITIES >= 2
 149 const char *const signalent1[] = {
 150 #include "signalent1.h"
 151 };
 152 const int nsignals1 = sizeof signalent1 / sizeof signalent1[0];
 153 #endif /* SUPPORTED_PERSONALITIES >= 2 */
 154
 155 #if SUPPORTED_PERSONALITIES >= 3
 156 const char *const signalent2[] = {
 157 #include "signalent2.h"
 158 };
 159 const int nsignals2 = sizeof signalent2 / sizeof signalent2[0];
 160 #endif /* SUPPORTED_PERSONALITIES >= 3 */
 161
 162 const char *const *signalent;
 163 int nsignals;
 164
 165 #if defined(SUNOS4) || defined(FREEBSD)
 166
 167 static const struct xlat sigvec_flags[] = {
 168         { SV_ONSTACK,   "SV_ONSTACK"    },
 169         { SV_INTERRUPT, "SV_INTERRUPT"  },
 170         { SV_RESETHAND, "SV_RESETHAND"  },
 171         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 172         { 0,            NULL            },
 173 };
 174
 175 #endif /* SUNOS4 || FREEBSD */
 176
 177 #ifdef HAVE_SIGACTION
 178
 179 #if defined LINUX && (defined I386 || defined X86_64)
 180 /* The libc headers do not define this constant since it should only be
 181    used by the implementation.  So wwe define it here.  */
 182 # ifndef SA_RESTORER
 183 #  define SA_RESTORER 0x04000000
 184 # endif
 185 #endif
 186
 187 static const struct xlat sigact_flags[] = {
 188 #ifdef SA_RESTORER
 189         { SA_RESTORER,  "SA_RESTORER"   },
 190 #endif
 191 #ifdef SA_STACK
 192         { SA_STACK,     "SA_STACK"      },
 193 #endif
 194 #ifdef SA_RESTART
 195         { SA_RESTART,   "SA_RESTART"    },
 196 #endif
 197 #ifdef SA_INTERRUPT
 198         { SA_INTERRUPT, "SA_INTERRUPT"  },
 199 #endif
 200 #ifdef SA_NODEFER
 201         { SA_NODEFER,   "SA_NODEFER"    },
 202 #endif
 203 #if defined SA_NOMASK && SA_NODEFER != SA_NOMASK
 204         { SA_NOMASK,    "SA_NOMASK"     },
 205 #endif
 206 #ifdef SA_RESETHAND
 207         { SA_RESETHAND, "SA_RESETHAND"  },
 208 #endif
 209 #if defined SA_ONESHOT && SA_ONESHOT != SA_RESETHAND
 210         { SA_ONESHOT,   "SA_ONESHOT"    },
 211 #endif
 212 #ifdef SA_SIGINFO
 213         { SA_SIGINFO,   "SA_SIGINFO"    },
 214 #endif
 215 #ifdef SA_RESETHAND
 216         { SA_RESETHAND, "SA_RESETHAND"  },
 217 #endif
 218 #ifdef SA_ONSTACK
 219         { SA_ONSTACK,   "SA_ONSTACK"    },
 220 #endif
 221 #ifdef SA_NODEFER
 222         { SA_NODEFER,   "SA_NODEFER"    },
 223 #endif
 224 #ifdef SA_NOCLDSTOP
 225         { SA_NOCLDSTOP, "SA_NOCLDSTOP"  },
 226 #endif
 227 #ifdef SA_NOCLDWAIT
 228         { SA_NOCLDWAIT, "SA_NOCLDWAIT"  },
 229 #endif
 230 #ifdef _SA_BSDCALL
 231         { _SA_BSDCALL,  "_SA_BSDCALL"   },
 232 #endif
 233 #ifdef SA_NOPTRACE
 234         { SA_NOPTRACE,  "SA_NOPTRACE"   },
 235 #endif
 236         { 0,            NULL            },
 237 };
 238
 239 static const struct xlat sigprocmaskcmds[] = {
 240         { SIG_BLOCK,    "SIG_BLOCK"     },
 241         { SIG_UNBLOCK,  "SIG_UNBLOCK"   },
 242         { SIG_SETMASK,  "SIG_SETMASK"   },
 243 #ifdef SIG_SETMASK32
 244         { SIG_SETMASK32,"SIG_SETMASK32" },
 245 #endif
 246         { 0,            NULL            },
 247 };
 248
 249 #endif /* HAVE_SIGACTION */
 250
 251 /* Anonymous realtime signals. */
 252 /* Under glibc 2.1, SIGRTMIN et al are functions, but __SIGRTMIN is a
 253    constant.  This is what we want.  Otherwise, just use SIGRTMIN. */
 254 #ifdef SIGRTMIN
 255 #ifndef __SIGRTMIN
 256 #define __SIGRTMIN SIGRTMIN
 257 #define __SIGRTMAX SIGRTMAX /* likewise */
 258 #endif
 259 #endif
 260
 261 const char *
 262 signame(sig)
 263 int sig;
 264 {
 265         static char buf[30];
 266         if (sig >= 0 && sig < nsignals) {
 267                 return signalent[sig];
 268 #ifdef SIGRTMIN
 269         } else if (sig >= __SIGRTMIN && sig <= __SIGRTMAX) {
 270                 sprintf(buf, "SIGRT_%ld", (long)(sig - __SIGRTMIN));
 271                 return buf;
 272 #endif /* SIGRTMIN */
 273         } else {
 274                 sprintf(buf, "%d", sig);
 275                 return buf;
 276         }
 277 }
 278
 279 #ifndef UNIXWARE
 280 static void
 281 long_to_sigset(l, s)
 282 long l;
 283 sigset_t *s;
 284 {
 285         sigemptyset(s);
 286         *(long *)s = l;
 287 }
 288 #endif
 289
 290 static int
 291 copy_sigset_len(tcp, addr, s, len)
 292 struct tcb *tcp;
 293 long addr;
 294 sigset_t *s;
 295 int len;
 296 {
 297         if (len > sizeof(*s))
 298                 len = sizeof(*s);
 299         sigemptyset(s);
 300         if (umoven(tcp, addr, len, (char *)s) < 0)
 301                 return -1;
 302         return 0;
 303 }
 304
 305 #ifdef LINUX
 306 /* Original sigset is unsigned long */
 307 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(long))
 308 #else
 309 #define copy_sigset(tcp, addr, s) copy_sigset_len(tcp, addr, s, sizeof(sigset_t))
 310 #endif
 311
 312 static const char *
 313 sprintsigmask(const char *str, sigset_t *mask, int rt)
 314 /* set might include realtime sigs */
 315 {
 316         int i, nsigs;
 317         int maxsigs;
 318         const char *format;
 319         char *s;
 320         static char outstr[8 * sizeof(sigset_t) * 8];
 321
 322         strcpy(outstr, str);
 323         s = outstr + strlen(outstr);
 324         nsigs = 0;
 325         maxsigs = nsignals;
 326 #ifdef __SIGRTMAX
 327         if (rt)
 328                 maxsigs = __SIGRTMAX; /* instead */
 329 #endif
 330         for (i = 1; i < maxsigs; i++) {
 331                 if (sigismember(mask, i) == 1)
 332                         nsigs++;
 333         }
 334         if (nsigs >= nsignals * 2 / 3) {
 335                 *s++ = '~';
 336                 for (i = 1; i < maxsigs; i++) {
 337                         switch (sigismember(mask, i)) {
 338                         case 1:
 339                                 sigdelset(mask, i);
 340                                 break;
 341                         case 0:
 342                                 sigaddset(mask, i);
 343                                 break;
 344                         }
 345                 }
 346         }
 347         format = "%s";
 348         *s++ = '[';
 349         for (i = 1; i < maxsigs; i++) {
 350                 if (sigismember(mask, i) == 1) {
 351                         /* real-time signals on solaris don't have
 352                          * signalent entries
 353                          */
 354                         if (i < nsignals) {
 355                                 sprintf(s, format, signalent[i] + 3);
 356                         }
 357 #ifdef SIGRTMIN
 358                         else if (i >= __SIGRTMIN && i <= __SIGRTMAX) {
 359                                 char tsig[40];
 360                                 sprintf(tsig, "RT_%u", i - __SIGRTMIN);
 361                                 sprintf(s, format, tsig);
 362                         }
 363 #endif /* SIGRTMIN */
 364                         else {
 365                                 char tsig[32];
 366                                 sprintf(tsig, "%u", i);
 367                                 sprintf(s, format, tsig);
 368                         }
 369                         s += strlen(s);
 370                         format = " %s";
 371                 }
 372         }
 373         *s++ = ']';
 374         *s = '\0';
 375         return outstr;
 376 }
 377
 378 static void
 379 printsigmask(mask, rt)
 380 sigset_t *mask;
 381 int rt;
 382 {
 383         tprintf("%s", sprintsigmask("", mask, rt));
 384 }
 385
 386 void
 387 printsignal(nr)
 388 int nr;
 389 {
 390         tprintf("%s", signame(nr));
 391 }
 392
 393 void
 394 print_sigset(struct tcb *tcp, long addr, int rt)
 395 {
 396         sigset_t ss;
 397
 398         if (!addr)
 399                 tprintf("NULL");
 400         else if (copy_sigset(tcp, addr, &ss) < 0)
 401                 tprintf("%#lx", addr);
 402         else
 403                 printsigmask(&ss, rt);
 404 }
 405
 406 #ifdef LINUX
 407
 408 #ifndef ILL_ILLOPC
 409 #define ILL_ILLOPC      1       /* illegal opcode */
 410 #define ILL_ILLOPN      2       /* illegal operand */
 411 #define ILL_ILLADR      3       /* illegal addressing mode */
 412 #define ILL_ILLTRP      4       /* illegal trap */
 413 #define ILL_PRVOPC      5       /* privileged opcode */
 414 #define ILL_PRVREG      6       /* privileged register */
 415 #define ILL_COPROC      7       /* coprocessor error */
 416 #define ILL_BADSTK      8       /* internal stack error */
 417 #define FPE_INTDIV      1       /* integer divide by zero */
 418 #define FPE_INTOVF      2       /* integer overflow */
 419 #define FPE_FLTDIV      3       /* floating point divide by zero */
 420 #define FPE_FLTOVF      4       /* floating point overflow */
 421 #define FPE_FLTUND      5       /* floating point underflow */
 422 #define FPE_FLTRES      6       /* floating point inexact result */
 423 #define FPE_FLTINV      7       /* floating point invalid operation */
 424 #define FPE_FLTSUB      8       /* subscript out of range */
 425 #define SEGV_MAPERR     1       /* address not mapped to object */
 426 #define SEGV_ACCERR     2       /* invalid permissions for mapped object */
 427 #define BUS_ADRALN      1       /* invalid address alignment */
 428 #define BUS_ADRERR      2       /* non-existant physical address */
 429 #define BUS_OBJERR      3       /* object specific hardware error */
 430 #define TRAP_BRKPT      1       /* process breakpoint */
 431 #define TRAP_TRACE      2       /* process trace trap */
 432 #define CLD_EXITED      1       /* child has exited */
 433 #define CLD_KILLED      2       /* child was killed */
 434 #define CLD_DUMPED      3       /* child terminated abnormally */
 435 #define CLD_TRAPPED     4       /* traced child has trapped */
 436 #define CLD_STOPPED     5       /* child has stopped */
 437 #define CLD_CONTINUED   6       /* stopped child has continued */
 438 #define POLL_IN         1       /* data input available */
 439 #define POLL_OUT        2       /* output buffers available */
 440 #define POLL_MSG        3       /* input message available */
 441 #define POLL_ERR        4       /* i/o error */
 442 #define POLL_PRI        5       /* high priority input available */
 443 #define POLL_HUP        6       /* device disconnected */
 444 #define SI_KERNEL       0x80    /* sent by kernel */
 445 #define SI_USER         0       /* sent by kill, sigsend, raise */
 446 #define SI_QUEUE        -1      /* sent by sigqueue */
 447 #define SI_TIMER        -2      /* sent by timer expiration */
 448 #define SI_MESGQ        -3      /* sent by real time mesq state change */
 449 #define SI_ASYNCIO      -4      /* sent by AIO completion */
 450 #define SI_SIGIO        -5      /* sent by SIGIO */
 451 #define SI_TKILL        -6      /* sent by tkill */
 452 #define SI_ASYNCNL      -60     /* sent by asynch name lookup completion */
 453
 454 #define SI_FROMUSER(sip)        ((sip)->si_code <= 0)
 455
 456 #endif /* LINUX */
 457
 458 #if __GLIBC_MINOR__ < 1
 459 /* Type for data associated with a signal.  */
 460 typedef union sigval
 461 {
 462         int sival_int;
 463         void *sival_ptr;
 464 } sigval_t;
 465
 466 # define __SI_MAX_SIZE     128
 467 # define __SI_PAD_SIZE     ((__SI_MAX_SIZE / sizeof (int)) - 3)
 468
 469 typedef struct siginfo
 470 {
 471         int si_signo;               /* Signal number.  */
 472         int si_errno;               /* If non-zero, an errno value associated with
 473                                                                    this signal, as defined in <errno.h>.  */
 474         int si_code;                /* Signal code.  */
 475
 476         union
 477         {
 478                 int _pad[__SI_PAD_SIZE];
 479
 480                 /* kill().  */
 481                 struct
 482                 {
 483                         __pid_t si_pid;     /* Sending process ID.  */
 484                         __uid_t si_uid;     /* Real user ID of sending process.  */
 485                 } _kill;
 486
 487                 /* POSIX.1b timers.  */
 488                 struct
 489                 {
 490                         unsigned int _timer1;
 491                         unsigned int _timer2;
 492                 } _timer;
 493
 494                 /* POSIX.1b signals.  */
 495                 struct
 496                 {
 497                         __pid_t si_pid;     /* Sending process ID.  */
 498                         __uid_t si_uid;     /* Real user ID of sending process.  */
 499                         sigval_t si_sigval; /* Signal value.  */
 500                 } _rt;
 501
 502                 /* SIGCHLD.  */
 503                 struct
 504                 {
 505                         __pid_t si_pid;     /* Which child.  */
 506                         int si_status;      /* Exit value or signal.  */
 507                         __clock_t si_utime;
 508                         __clock_t si_stime;
 509                 } _sigchld;
 510
 511                 /* SIGILL, SIGFPE, SIGSEGV, SIGBUS.  */
 512                 struct
 513                 {
 514                         void *si_addr;      /* Faulting insn/memory ref.  */
 515                 } _sigfault;
 516
 517                 /* SIGPOLL.  */
 518                 struct
 519                 {
 520                         int si_band;        /* Band event for SIGPOLL.  */
 521                         int si_fd;
 522                 } _sigpoll;
 523         } _sifields;
 524 } siginfo_t;
 525
 526 #define si_pid          _sifields._kill.si_pid
 527 #define si_uid          _sifields._kill.si_uid
 528 #define si_status       _sifields._sigchld.si_status
 529 #define si_utime        _sifields._sigchld.si_utime
 530 #define si_stime        _sifields._sigchld.si_stime
 531 #define si_value        _sifields._rt.si_sigval
 532 #define si_int          _sifields._rt.si_sigval.sival_int
 533 #define si_ptr          _sifields._rt.si_sigval.sival_ptr
 534 #define si_addr         _sifields._sigfault.si_addr
 535 #define si_band         _sifields._sigpoll.si_band
 536 #define si_fd           _sifields._sigpoll.si_fd
 537
 538 #endif
 539
 540 #endif
 541
 542 #if defined (SVR4) || defined (LINUX)
 543
 544 static const struct xlat siginfo_codes[] = {
 545 #ifdef SI_KERNEL
 546         { SI_KERNEL,    "SI_KERNEL"     },
 547 #endif
 548 #ifdef SI_USER
 549         { SI_USER,      "SI_USER"       },
 550 #endif
 551 #ifdef SI_QUEUE
 552         { SI_QUEUE,     "SI_QUEUE"      },
 553 #endif
 554 #ifdef SI_TIMER
 555         { SI_TIMER,     "SI_TIMER"      },
 556 #endif
 557 #ifdef SI_MESGQ
 558         { SI_MESGQ,     "SI_MESGQ"      },
 559 #endif
 560 #ifdef SI_ASYNCIO
 561         { SI_ASYNCIO,   "SI_ASYNCIO"    },
 562 #endif
 563 #ifdef SI_SIGIO
 564         { SI_SIGIO,     "SI_SIGIO"      },
 565 #endif
 566 #ifdef SI_TKILL
 567         { SI_TKILL,     "SI_TKILL"      },
 568 #endif
 569 #ifdef SI_ASYNCNL
 570         { SI_ASYNCNL,   "SI_ASYNCNL"    },
 571 #endif
 572 #ifdef SI_NOINFO
 573         { SI_NOINFO,    "SI_NOINFO"     },
 574 #endif
 575 #ifdef SI_LWP
 576         { SI_LWP,       "SI_LWP"        },
 577 #endif
 578         { 0,            NULL            },
 579 };
 580
 581 static const struct xlat sigill_codes[] = {
 582         { ILL_ILLOPC,   "ILL_ILLOPC"    },
 583         { ILL_ILLOPN,   "ILL_ILLOPN"    },
 584         { ILL_ILLADR,   "ILL_ILLADR"    },
 585         { ILL_ILLTRP,   "ILL_ILLTRP"    },
 586         { ILL_PRVOPC,   "ILL_PRVOPC"    },
 587         { ILL_PRVREG,   "ILL_PRVREG"    },
 588         { ILL_COPROC,   "ILL_COPROC"    },
 589         { ILL_BADSTK,   "ILL_BADSTK"    },
 590         { 0,            NULL            },
 591 };
 592
 593 static const struct xlat sigfpe_codes[] = {
 594         { FPE_INTDIV,   "FPE_INTDIV"    },
 595         { FPE_INTOVF,   "FPE_INTOVF"    },
 596         { FPE_FLTDIV,   "FPE_FLTDIV"    },
 597         { FPE_FLTOVF,   "FPE_FLTOVF"    },
 598         { FPE_FLTUND,   "FPE_FLTUND"    },
 599         { FPE_FLTRES,   "FPE_FLTRES"    },
 600         { FPE_FLTINV,   "FPE_FLTINV"    },
 601         { FPE_FLTSUB,   "FPE_FLTSUB"    },
 602         { 0,            NULL            },
 603 };
 604
 605 static const struct xlat sigtrap_codes[] = {
 606         { TRAP_BRKPT,   "TRAP_BRKPT"    },
 607         { TRAP_TRACE,   "TRAP_TRACE"    },
 608         { 0,            NULL            },
 609 };
 610
 611 static const struct xlat sigchld_codes[] = {
 612         { CLD_EXITED,   "CLD_EXITED"    },
 613         { CLD_KILLED,   "CLD_KILLED"    },
 614         { CLD_DUMPED,   "CLD_DUMPED"    },
 615         { CLD_TRAPPED,  "CLD_TRAPPED"   },
 616         { CLD_STOPPED,  "CLD_STOPPED"   },
 617         { CLD_CONTINUED,"CLD_CONTINUED" },
 618         { 0,            NULL            },
 619 };
 620
 621 static const struct xlat sigpoll_codes[] = {
 622         { POLL_IN,      "POLL_IN"       },
 623         { POLL_OUT,     "POLL_OUT"      },
 624         { POLL_MSG,     "POLL_MSG"      },
 625         { POLL_ERR,     "POLL_ERR"      },
 626         { POLL_PRI,     "POLL_PRI"      },
 627         { POLL_HUP,     "POLL_HUP"      },
 628         { 0,            NULL            },
 629 };
 630
 631 static const struct xlat sigprof_codes[] = {
 632 #ifdef PROF_SIG
 633         { PROF_SIG,     "PROF_SIG"      },
 634 #endif
 635         { 0,            NULL            },
 636 };
 637
 638 #ifdef SIGEMT
 639 static const struct xlat sigemt_codes[] = {
 640 #ifdef EMT_TAGOVF
 641         { EMT_TAGOVF,   "EMT_TAGOVF"    },
 642 #endif
 643         { 0,            NULL            },
 644 };
 645 #endif
 646
 647 static const struct xlat sigsegv_codes[] = {
 648         { SEGV_MAPERR,  "SEGV_MAPERR"   },
 649         { SEGV_ACCERR,  "SEGV_ACCERR"   },
 650         { 0,            NULL            },
 651 };
 652
 653 static const struct xlat sigbus_codes[] = {
 654         { BUS_ADRALN,   "BUS_ADRALN"    },
 655         { BUS_ADRERR,   "BUS_ADRERR"    },
 656         { BUS_OBJERR,   "BUS_OBJERR"    },
 657         { 0,            NULL            },
 658 };
 659
 660 void
 661 printsiginfo(siginfo_t *sip, int verbose)
 662 {
 663         const char *code;
 664
 665         if (sip->si_signo == 0) {
 666                 tprintf ("{}");
 667                 return;
 668         }
 669         tprintf("{si_signo=");
 670         printsignal(sip->si_signo);
 671         code = xlookup(siginfo_codes, sip->si_code);
 672         if (!code) {
 673                 switch (sip->si_signo) {
 674                 case SIGTRAP:
 675                         code = xlookup(sigtrap_codes, sip->si_code);
 676                         break;
 677                 case SIGCHLD:
 678                         code = xlookup(sigchld_codes, sip->si_code);
 679                         break;
 680                 case SIGPOLL:
 681                         code = xlookup(sigpoll_codes, sip->si_code);
 682                         break;
 683                 case SIGPROF:
 684                         code = xlookup(sigprof_codes, sip->si_code);
 685                         break;
 686                 case SIGILL:
 687                         code = xlookup(sigill_codes, sip->si_code);
 688                         break;
 689 #ifdef SIGEMT
 690                 case SIGEMT:
 691                         code = xlookup(sigemt_codes, sip->si_code);
 692                         break;
 693 #endif
 694                 case SIGFPE:
 695                         code = xlookup(sigfpe_codes, sip->si_code);
 696                         break;
 697                 case SIGSEGV:
 698                         code = xlookup(sigsegv_codes, sip->si_code);
 699                         break;
 700                 case SIGBUS:
 701                         code = xlookup(sigbus_codes, sip->si_code);
 702                         break;
 703                 }
 704         }
 705         if (code)
 706                 tprintf(", si_code=%s", code);
 707         else
 708                 tprintf(", si_code=%#x", sip->si_code);
 709 #ifdef SI_NOINFO
 710         if (sip->si_code != SI_NOINFO)
 711 #endif
 712         {
 713                 if (sip->si_errno) {
 714                         if (sip->si_errno < 0 || sip->si_errno >= nerrnos)
 715                                 tprintf(", si_errno=%d", sip->si_errno);
 716                         else
 717                                 tprintf(", si_errno=%s",
 718                                         errnoent[sip->si_errno]);
 719                 }
 720 #ifdef SI_FROMUSER
 721                 if (SI_FROMUSER(sip)) {
 722                         tprintf(", si_pid=%lu, si_uid=%lu",
 723                                 (unsigned long) sip->si_pid,
 724                                 (unsigned long) sip->si_uid);
 725                         switch (sip->si_code) {
 726 #ifdef SI_USER
 727                         case SI_USER:
 728                                 break;
 729 #endif
 730 #ifdef SI_TKILL
 731                         case SI_TKILL:
 732                                 break;
 733 #endif
 734 #ifdef SI_TIMER
 735                         case SI_TIMER:
 736                                 tprintf(", si_value=%d", sip->si_int);
 737                                 break;
 738 #endif
 739 #ifdef LINUX
 740                         default:
 741                                 if (!sip->si_ptr)
 742                                         break;
 743                                 if (!verbose)
 744                                         tprintf(", ...");
 745                                 else
 746                                         tprintf(", si_value={int=%u, ptr=%#lx}",
 747                                                 sip->si_int,
 748                                                 (unsigned long) sip->si_ptr);
 749                                 break;
 750 #endif
 751                         }
 752                 }
 753                 else
 754 #endif /* SI_FROMUSER */
 755                 {
 756                         switch (sip->si_signo) {
 757                         case SIGCHLD:
 758                                 tprintf(", si_pid=%ld, si_status=",
 759                                         (long) sip->si_pid);
 760                                 if (sip->si_code == CLD_EXITED)
 761                                         tprintf("%d", sip->si_status);
 762                                 else
 763                                         printsignal(sip->si_status);
 764 #if LINUX
 765                                 if (!verbose)
 766                                         tprintf(", ...");
 767                                 else
 768                                         tprintf(", si_utime=%lu, si_stime=%lu",
 769                                                 sip->si_utime,
 770                                                 sip->si_stime);
 771 #endif
 772                                 break;
 773                         case SIGILL: case SIGFPE:
 774                         case SIGSEGV: case SIGBUS:
 775                                 tprintf(", si_addr=%#lx",
 776                                         (unsigned long) sip->si_addr);
 777                                 break;
 778                         case SIGPOLL:
 779                                 switch (sip->si_code) {
 780                                 case POLL_IN: case POLL_OUT: case POLL_MSG:
 781                                         tprintf(", si_band=%ld",
 782                                                 (long) sip->si_band);
 783                                         break;
 784                                 }
 785                                 break;
 786 #ifdef LINUX
 787                         default:
 788                                 if (sip->si_pid || sip->si_uid)
 789                                         tprintf(", si_pid=%lu, si_uid=%lu",
 790                                                 (unsigned long) sip->si_pid,
 791                                                 (unsigned long) sip->si_uid);
 792                                 if (!sip->si_ptr)
 793                                         break;
 794                                 if (!verbose)
 795                                         tprintf(", ...");
 796                                 else {
 797                                         tprintf(", si_value={int=%u, ptr=%#lx}",
 798                                                 sip->si_int,
 799                                                 (unsigned long) sip->si_ptr);
 800                                 }
 801 #endif
 802
 803                         }
 804                 }
 805         }
 806         tprintf("}");
 807 }
 808
 809 #endif /* SVR4 || LINUX */
 810
 811 #ifdef LINUX
 812
 813 static void
 814 parse_sigset_t(const char *str, sigset_t *set)
 815 {
 816         const char *p;
 817         unsigned int digit;
 818         int i;
 819
 820         sigemptyset(set);
 821
 822         p = strchr(str, '\n');
 823         if (p == NULL)
 824                 p = strchr(str, '\0');
 825         for (i = 0; p-- > str; i += 4) {
 826                 if (*p >= '0' && *p <= '9')
 827                         digit = *p - '0';
 828                 else if (*p >= 'a' && *p <= 'f')
 829                         digit = *p - 'a' + 10;
 830                 else if (*p >= 'A' && *p <= 'F')
 831                         digit = *p - 'A' + 10;
 832                 else
 833                         break;
 834                 if (digit & 1)
 835                         sigaddset(set, i + 1);
 836                 if (digit & 2)
 837                         sigaddset(set, i + 2);
 838                 if (digit & 4)
 839                         sigaddset(set, i + 3);
 840                 if (digit & 8)
 841                         sigaddset(set, i + 4);
 842         }
 843 }
 844
 845 #endif
 846
 847 /*
 848  * Check process TCP for the disposition of signal SIG.
 849  * Return 1 if the process would somehow manage to  survive signal SIG,
 850  * else return 0.  This routine will never be called with SIGKILL.
 851  */
 852 int
 853 sigishandled(tcp, sig)
 854 struct tcb *tcp;
 855 int sig;
 856 {
 857 #ifdef LINUX
 858         int sfd;
 859         char sname[32];
 860         char buf[2048];
 861         const char *s;
 862         int i;
 863         sigset_t ignored, caught;
 864 #endif
 865 #ifdef SVR4
 866         /*
 867          * Since procfs doesn't interfere with wait I think it is safe
 868          * to punt on this question.  If not, the information is there.
 869          */
 870         return 1;
 871 #else /* !SVR4 */
 872         switch (sig) {
 873         case SIGCONT:
 874         case SIGSTOP:
 875         case SIGTSTP:
 876         case SIGTTIN:
 877         case SIGTTOU:
 878         case SIGCHLD:
 879         case SIGIO:
 880 #if defined(SIGURG) && SIGURG != SIGIO
 881         case SIGURG:
 882 #endif
 883         case SIGWINCH:
 884                 /* Gloria Gaynor says ... */
 885                 return 1;
 886         default:
 887                 break;
 888         }
 889 #endif /* !SVR4 */
 890 #ifdef LINUX
 891
 892         /* This is incredibly costly but it's worth it. */
 893         /* NOTE: LinuxThreads internally uses SIGRTMIN, SIGRTMIN + 1 and
 894            SIGRTMIN + 2, so we can't use the obsolete /proc/%d/stat which
 895            doesn't handle real-time signals). */
 896         sprintf(sname, "/proc/%d/status", tcp->pid);
 897         if ((sfd = open(sname, O_RDONLY)) == -1) {
 898                 perror(sname);
 899                 return 1;
 900         }
 901         i = read(sfd, buf, sizeof(buf));
 902         buf[i] = '\0';
 903         close(sfd);
 904         /*
 905          * Skip the extraneous fields. We need to skip
 906          * command name has any spaces in it.  So be it.
 907          */
 908         s = strstr(buf, "SigIgn:\t");
 909         if (!s)
 910         {
 911                 fprintf(stderr, "/proc/pid/status format error\n");
 912                 return 1;
 913         }
 914         parse_sigset_t(s + 8, &ignored);
 915
 916         s = strstr(buf, "SigCgt:\t");
 917         if (!s)
 918         {
 919                 fprintf(stderr, "/proc/pid/status format error\n");
 920                 return 1;
 921         }
 922         parse_sigset_t(s + 8, &caught);
 923
 924 #ifdef DEBUG
 925         fprintf(stderr, "sigs: %016qx %016qx (sig=%d)\n",
 926                 *(long long *) &ignored, *(long long *) &caught, sig);
 927 #endif
 928         if (sigismember(&ignored, sig) || sigismember(&caught, sig))
 929                 return 1;
 930 #endif /* LINUX */
 931
 932 #ifdef SUNOS4
 933         void (*u_signal)();
 934
 935         if (upeek(tcp, uoff(u_signal[0]) + sig*sizeof(u_signal),
 936             (long *) &u_signal) < 0) {
 937                 return 0;
 938         }
 939         if (u_signal != SIG_DFL)
 940                 return 1;
 941 #endif /* SUNOS4 */
 942
 943         return 0;
 944 }
 945
 946 #if defined(SUNOS4) || defined(FREEBSD)
 947
 948 int
 949 sys_sigvec(tcp)
 950 struct tcb *tcp;
 951 {
 952         struct sigvec sv;
 953         long addr;
 954
 955         if (entering(tcp)) {
 956                 printsignal(tcp->u_arg[0]);
 957                 tprintf(", ");
 958                 addr = tcp->u_arg[1];
 959         } else {
 960                 addr = tcp->u_arg[2];
 961         }
 962         if (addr == 0)
 963                 tprintf("NULL");
 964         else if (!verbose(tcp))
 965                 tprintf("%#lx", addr);
 966         else if (umove(tcp, addr, &sv) < 0)
 967                 tprintf("{...}");
 968         else {
 969                 switch ((int) sv.sv_handler) {
 970                 case (int) SIG_ERR:
 971                         tprintf("{SIG_ERR}");
 972                         break;
 973                 case (int) SIG_DFL:
 974                         tprintf("{SIG_DFL}");
 975                         break;
 976                 case (int) SIG_IGN:
 977                         if (tcp->u_arg[0] == SIGTRAP) {
 978                                 tcp->flags |= TCB_SIGTRAPPED;
 979                                 kill(tcp->pid, SIGSTOP);
 980                         }
 981                         tprintf("{SIG_IGN}");
 982                         break;
 983                 case (int) SIG_HOLD:
 984                         if (tcp->u_arg[0] == SIGTRAP) {
 985                                 tcp->flags |= TCB_SIGTRAPPED;
 986                                 kill(tcp->pid, SIGSTOP);
 987                         }
 988                         tprintf("SIG_HOLD");
 989                         break;
 990                 default:
 991                         if (tcp->u_arg[0] == SIGTRAP) {
 992                                 tcp->flags |= TCB_SIGTRAPPED;
 993                                 kill(tcp->pid, SIGSTOP);
 994                         }
 995                         tprintf("{%#lx, ", (unsigned long) sv.sv_handler);
 996                         printsigmask(&sv.sv_mask, 0);
 997                         tprintf(", ");
 998                         printflags(sigvec_flags, sv.sv_flags, "SV_???");
 999                         tprintf("}");
1000                 }
1001         }
1002         if (entering(tcp))
1003                 tprintf(", ");
1004         return 0;
1005 }
1006
1007 int
1008 sys_sigpause(tcp)
1009 struct tcb *tcp;
1010 {
1011         if (entering(tcp)) {    /* WTA: UD had a bug here: he forgot the braces */
1012                 sigset_t sigm;
1013                 long_to_sigset(tcp->u_arg[0], &sigm);
1014                 printsigmask(&sigm, 0);
1015         }
1016         return 0;
1017 }
1018
1019 int
1020 sys_sigstack(tcp)
1021 struct tcb *tcp;
1022 {
1023         struct sigstack ss;
1024         long addr;
1025
1026         if (entering(tcp))
1027                 addr = tcp->u_arg[0];
1028         else
1029                 addr = tcp->u_arg[1];
1030         if (addr == 0)
1031                 tprintf("NULL");
1032         else if (umove(tcp, addr, &ss) < 0)
1033                 tprintf("%#lx", addr);
1034         else {
1035                 tprintf("{ss_sp %#lx ", (unsigned long) ss.ss_sp);
1036                 tprintf("ss_onstack %s}", ss.ss_onstack ? "YES" : "NO");
1037         }
1038         if (entering(tcp))
1039                 tprintf(", ");
1040         return 0;
1041 }
1042
1043 int
1044 sys_sigcleanup(tcp)
1045 struct tcb *tcp;
1046 {
1047         return 0;
1048 }
1049
1050 #endif /* SUNOS4 || FREEBSD */
1051
1052 #ifndef SVR4
1053
1054 int
1055 sys_sigsetmask(tcp)
1056 struct tcb *tcp;
1057 {
1058         if (entering(tcp)) {
1059                 sigset_t sigm;
1060                 long_to_sigset(tcp->u_arg[0], &sigm);
1061                 printsigmask(&sigm, 0);
1062 #ifndef USE_PROCFS
1063                 if ((tcp->u_arg[0] & sigmask(SIGTRAP))) {
1064                         /* Mark attempt to block SIGTRAP */
1065                         tcp->flags |= TCB_SIGTRAPPED;
1066                         /* Send unblockable signal */
1067                         kill(tcp->pid, SIGSTOP);
1068                 }
1069 #endif /* !USE_PROCFS */
1070         }
1071         else if (!syserror(tcp)) {
1072                 sigset_t sigm;
1073                 long_to_sigset(tcp->u_rval, &sigm);
1074                 tcp->auxstr = sprintsigmask("old mask ", &sigm, 0);
1075
1076                 return RVAL_HEX | RVAL_STR;
1077         }
1078         return 0;
1079 }
1080
1081 #if defined(SUNOS4) || defined(FREEBSD)
1082 int
1083 sys_sigblock(tcp)
1084 struct tcb *tcp;
1085 {
1086         return sys_sigsetmask(tcp);
1087 }
1088 #endif /* SUNOS4 || FREEBSD */
1089
1090 #endif /* !SVR4 */
1091
1092 #ifdef HAVE_SIGACTION
1093
1094 #ifdef LINUX
1095 struct old_sigaction {
1096         __sighandler_t __sa_handler;
1097         unsigned long sa_mask;
1098         unsigned long sa_flags;
1099         void (*sa_restorer)(void);
1100 };
1101 #define SA_HANDLER __sa_handler
1102 #endif /* LINUX */
1103
1104 #ifndef SA_HANDLER
1105 #define SA_HANDLER sa_handler
1106 #endif
1107
1108 int
1109 sys_sigaction(tcp)
1110 struct tcb *tcp;
1111 {
1112         long addr;
1113 #ifdef LINUX
1114         sigset_t sigset;
1115         struct old_sigaction sa;
1116 #else
1117         struct sigaction sa;
1118 #endif
1119
1120
1121         if (entering(tcp)) {
1122                 printsignal(tcp->u_arg[0]);
1123                 tprintf(", ");
1124                 addr = tcp->u_arg[1];
1125         } else
1126                 addr = tcp->u_arg[2];
1127         if (addr == 0)
1128                 tprintf("NULL");
1129         else if (!verbose(tcp))
1130                 tprintf("%#lx", addr);
1131         else if (umove(tcp, addr, &sa) < 0)
1132                 tprintf("{...}");
1133         else {
1134                 /* Architectures using function pointers, like
1135                  * hppa, may need to manipulate the function pointer
1136                  * to compute the result of a comparison. However,
1137                  * the SA_HANDLER function pointer exists only in
1138                  * the address space of the traced process, and can't
1139                  * be manipulated by strace. In order to prevent the
1140                  * compiler from generating code to manipulate
1141                  * SA_HANDLER we cast the function pointers to long. */
1142                 if ((long)sa.SA_HANDLER == (long)SIG_ERR)
1143                         tprintf("{SIG_ERR, ");
1144                 else if ((long)sa.SA_HANDLER == (long)SIG_DFL)
1145                         tprintf("{SIG_DFL, ");
1146                 else if ((long)sa.SA_HANDLER == (long)SIG_IGN) {
1147 #ifndef USE_PROCFS
1148                         if (tcp->u_arg[0] == SIGTRAP) {
1149                                 tcp->flags |= TCB_SIGTRAPPED;
1150                                 kill(tcp->pid, SIGSTOP);
1151                         }
1152 #endif /* !USE_PROCFS */
1153                         tprintf("{SIG_IGN, ");
1154                 }
1155                 else {
1156 #ifndef USE_PROCFS
1157                         if (tcp->u_arg[0] == SIGTRAP) {
1158                                 tcp->flags |= TCB_SIGTRAPPED;
1159                                 kill(tcp->pid, SIGSTOP);
1160                         }
1161 #endif /* !USE_PROCFS */
1162                         tprintf("{%#lx, ", (long) sa.SA_HANDLER);
1163 #ifndef LINUX
1164                         printsigmask (&sa.sa_mask, 0);
1165 #else
1166                         long_to_sigset(sa.sa_mask, &sigset);
1167                         printsigmask(&sigset, 0);
1168 #endif
1169                         tprintf(", ");
1170                         printflags(sigact_flags, sa.sa_flags, "SA_???");
1171 #ifdef SA_RESTORER
1172                         if (sa.sa_flags & SA_RESTORER)
1173                                 tprintf(", %p", sa.sa_restorer);
1174 #endif
1175                         tprintf("}");
1176                 }
1177         }
1178         if (entering(tcp))
1179                 tprintf(", ");
1180 #ifdef LINUX
1181         else
1182                 tprintf(", %#lx", (unsigned long) sa.sa_restorer);
1183 #endif
1184         return 0;
1185 }
1186
1187 int
1188 sys_signal(tcp)
1189 struct tcb *tcp;
1190 {
1191         if (entering(tcp)) {
1192                 printsignal(tcp->u_arg[0]);
1193                 tprintf(", ");
1194                 switch (tcp->u_arg[1]) {
1195                 case (long) SIG_ERR:
1196                         tprintf("SIG_ERR");
1197                         break;
1198                 case (long) SIG_DFL:
1199                         tprintf("SIG_DFL");
1200                         break;
1201                 case (long) SIG_IGN:
1202 #ifndef USE_PROCFS
1203                         if (tcp->u_arg[0] == SIGTRAP) {
1204                                 tcp->flags |= TCB_SIGTRAPPED;
1205                                 kill(tcp->pid, SIGSTOP);
1206                         }
1207 #endif /* !USE_PROCFS */
1208                         tprintf("SIG_IGN");
1209                         break;
1210                 default:
1211 #ifndef USE_PROCFS
1212                         if (tcp->u_arg[0] == SIGTRAP) {
1213                                 tcp->flags |= TCB_SIGTRAPPED;
1214                                 kill(tcp->pid, SIGSTOP);
1215                         }
1216 #endif /* !USE_PROCFS */
1217                         tprintf("%#lx", tcp->u_arg[1]);
1218                 }
1219                 return 0;
1220         }
1221         else if (!syserror(tcp)) {
1222                 switch (tcp->u_rval) {
1223                     case (long) SIG_ERR:
1224                         tcp->auxstr = "SIG_ERR"; break;
1225                     case (long) SIG_DFL:
1226                         tcp->auxstr = "SIG_DFL"; break;
1227                     case (long) SIG_IGN:
1228                         tcp->auxstr = "SIG_IGN"; break;
1229                     default:
1230                         tcp->auxstr = NULL;
1231                 }
1232                 return RVAL_HEX | RVAL_STR;
1233         }
1234         return 0;
1235 }
1236
1237 #ifdef SVR4
1238 int
1239 sys_sighold(tcp)
1240 struct tcb *tcp;
1241 {
1242         if (entering(tcp)) {
1243                 printsignal(tcp->u_arg[0]);
1244         }
1245         return 0;
1246 }
1247 #endif /* SVR4 */
1248
1249 #endif /* HAVE_SIGACTION */
1250
1251 #ifdef LINUX
1252
1253 int
1254 sys_sigreturn(struct tcb *tcp)
1255 {
1256 #if defined(ARM)
1257         struct pt_regs regs;
1258         struct sigcontext_struct sc;
1259
1260         if (entering(tcp)) {
1261                 tcp->u_arg[0] = 0;
1262
1263                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (void *)&regs) == -1)
1264                         return 0;
1265
1266                 if (umove(tcp, regs.ARM_sp, &sc) < 0)
1267                         return 0;
1268
1269                 tcp->u_arg[0] = 1;
1270                 tcp->u_arg[1] = sc.oldmask;
1271         } else {
1272                 sigset_t sigm;
1273                 long_to_sigset(tcp->u_arg[1], &sigm);
1274                 tcp->u_rval = tcp->u_error = 0;
1275                 if (tcp->u_arg[0] == 0)
1276                         return 0;
1277                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1278                 return RVAL_NONE | RVAL_STR;
1279         }
1280         return 0;
1281 #elif defined(S390) || defined(S390X)
1282         long usp;
1283         struct sigcontext_struct sc;
1284
1285         if (entering(tcp)) {
1286                 tcp->u_arg[0] = 0;
1287                 if (upeek(tcp,PT_GPR15,&usp)<0)
1288                         return 0;
1289                 if (umove(tcp, usp+__SIGNAL_FRAMESIZE, &sc) < 0)
1290                         return 0;
1291                 tcp->u_arg[0] = 1;
1292                 memcpy(&tcp->u_arg[1],&sc.oldmask[0],sizeof(sigset_t));
1293         } else {
1294                 tcp->u_rval = tcp->u_error = 0;
1295                 if (tcp->u_arg[0] == 0)
1296                         return 0;
1297                 tcp->auxstr = sprintsigmask("mask now ",(sigset_t *)&tcp->u_arg[1],0);
1298                 return RVAL_NONE | RVAL_STR;
1299         }
1300         return 0;
1301 #elif defined(I386)
1302         long esp;
1303         struct sigcontext_struct sc;
1304
1305         if (entering(tcp)) {
1306                 tcp->u_arg[0] = 0;
1307                 if (upeek(tcp, 4*UESP, &esp) < 0)
1308                         return 0;
1309                 if (umove(tcp, esp, &sc) < 0)
1310                         return 0;
1311                 tcp->u_arg[0] = 1;
1312                 tcp->u_arg[1] = sc.oldmask;
1313         }
1314         else {
1315                 sigset_t sigm;
1316                 long_to_sigset(tcp->u_arg[1], &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(IA64)
1325         struct sigcontext sc;
1326         long sp;
1327
1328         if (entering(tcp)) {
1329                 /* offset of sigcontext in the kernel's sigframe structure: */
1330 #               define SIGFRAME_SC_OFFSET       0x90
1331                 tcp->u_arg[0] = 0;
1332                 if (upeek(tcp, PT_R12, &sp) < 0)
1333                         return 0;
1334                 if (umove(tcp, sp + 16 + SIGFRAME_SC_OFFSET, &sc) < 0)
1335                         return 0;
1336                 tcp->u_arg[0] = 1;
1337                 memcpy(tcp->u_arg + 1, &sc.sc_mask, sizeof(sc.sc_mask));
1338         }
1339         else {
1340                 sigset_t sigm;
1341
1342                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1343                 tcp->u_rval = tcp->u_error = 0;
1344                 if (tcp->u_arg[0] == 0)
1345                         return 0;
1346                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1347                 return RVAL_NONE | RVAL_STR;
1348         }
1349         return 0;
1350 #elif defined(POWERPC)
1351         long esp;
1352         struct sigcontext_struct sc;
1353
1354         if (entering(tcp)) {
1355                 tcp->u_arg[0] = 0;
1356                 if (upeek(tcp, sizeof(unsigned long)*PT_R1, &esp) < 0)
1357                         return 0;
1358                 /* Skip dummy stack frame. */
1359 #ifdef POWERPC64
1360                 if (current_personality == 0)
1361                         esp += 128;
1362                 else
1363                         esp += 64;
1364 #else
1365                 esp += 64;
1366 #endif
1367                 if (umove(tcp, esp, &sc) < 0)
1368                         return 0;
1369                 tcp->u_arg[0] = 1;
1370                 tcp->u_arg[1] = sc.oldmask;
1371         }
1372         else {
1373                 sigset_t sigm;
1374                 long_to_sigset(tcp->u_arg[1], &sigm);
1375                 tcp->u_rval = tcp->u_error = 0;
1376                 if (tcp->u_arg[0] == 0)
1377                         return 0;
1378                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1379                 return RVAL_NONE | RVAL_STR;
1380         }
1381         return 0;
1382 #elif defined(M68K)
1383         long usp;
1384         struct sigcontext sc;
1385
1386         if (entering(tcp)) {
1387                 tcp->u_arg[0] = 0;
1388                 if (upeek(tcp, 4*PT_USP, &usp) < 0)
1389                         return 0;
1390                 if (umove(tcp, usp, &sc) < 0)
1391                         return 0;
1392                 tcp->u_arg[0] = 1;
1393                 tcp->u_arg[1] = sc.sc_mask;
1394         }
1395         else {
1396                 sigset_t sigm;
1397                 long_to_sigset(tcp->u_arg[1], &sigm);
1398                 tcp->u_rval = tcp->u_error = 0;
1399                 if (tcp->u_arg[0] == 0)
1400                         return 0;
1401                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1402                 return RVAL_NONE | RVAL_STR;
1403         }
1404         return 0;
1405 #elif defined(ALPHA)
1406         long fp;
1407         struct sigcontext_struct sc;
1408
1409         if (entering(tcp)) {
1410                 tcp->u_arg[0] = 0;
1411                 if (upeek(tcp, REG_FP, &fp) < 0)
1412                         return 0;
1413                 if (umove(tcp, fp, &sc) < 0)
1414                         return 0;
1415                 tcp->u_arg[0] = 1;
1416                 tcp->u_arg[1] = sc.sc_mask;
1417         }
1418         else {
1419                 sigset_t sigm;
1420                 long_to_sigset(tcp->u_arg[1], &sigm);
1421                 tcp->u_rval = tcp->u_error = 0;
1422                 if (tcp->u_arg[0] == 0)
1423                         return 0;
1424                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1425                 return RVAL_NONE | RVAL_STR;
1426         }
1427         return 0;
1428 #elif defined (SPARC) || defined (SPARC64)
1429         long i1;
1430         struct pt_regs regs;
1431         m_siginfo_t si;
1432
1433         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1434                 perror("sigreturn: PTRACE_GETREGS ");
1435                 return 0;
1436         }
1437         if(entering(tcp)) {
1438                 tcp->u_arg[0] = 0;
1439                 i1 = regs.u_regs[U_REG_O1];
1440                 if(umove(tcp, i1, &si) < 0) {
1441                         perror("sigreturn: umove ");
1442                         return 0;
1443                 }
1444                 tcp->u_arg[0] = 1;
1445                 tcp->u_arg[1] = si.si_mask;
1446         } else {
1447                 sigset_t sigm;
1448                 long_to_sigset(tcp->u_arg[1], &sigm);
1449                 tcp->u_rval = tcp->u_error = 0;
1450                 if(tcp->u_arg[0] == 0)
1451                         return 0;
1452                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1453                 return RVAL_NONE | RVAL_STR;
1454         }
1455         return 0;
1456 #elif defined (LINUX_MIPSN32) || defined (LINUX_MIPSN64)
1457         /* This decodes rt_sigreturn.  The 64-bit ABIs do not have
1458            sigreturn.  */
1459         long sp;
1460         struct ucontext uc;
1461
1462         if(entering(tcp)) {
1463                 tcp->u_arg[0] = 0;
1464                 if (upeek(tcp, REG_SP, &sp) < 0)
1465                         return 0;
1466                 /* There are six words followed by a 128-byte siginfo.  */
1467                 sp = sp + 6 * 4 + 128;
1468                 if (umove(tcp, sp, &uc) < 0)
1469                         return 0;
1470                 tcp->u_arg[0] = 1;
1471                 tcp->u_arg[1] = *(long *) &uc.uc_sigmask;
1472         } else {
1473                 sigset_t sigm;
1474                 long_to_sigset(tcp->u_arg[1], &sigm);
1475                 tcp->u_rval = tcp->u_error = 0;
1476                 if(tcp->u_arg[0] == 0)
1477                         return 0;
1478                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1479                 return RVAL_NONE | RVAL_STR;
1480         }
1481         return 0;
1482 #elif defined(MIPS)
1483         long sp;
1484         struct pt_regs regs;
1485         m_siginfo_t si;
1486
1487         if(ptrace(PTRACE_GETREGS, tcp->pid, (char *)&regs, 0) < 0) {
1488                 perror("sigreturn: PTRACE_GETREGS ");
1489                 return 0;
1490         }
1491         if(entering(tcp)) {
1492                 tcp->u_arg[0] = 0;
1493                 sp = regs.regs[29];
1494                 if (umove(tcp, sp, &si) < 0)
1495                 tcp->u_arg[0] = 1;
1496                 tcp->u_arg[1] = si.si_mask;
1497         } else {
1498                 sigset_t sigm;
1499                 long_to_sigset(tcp->u_arg[1], &sigm);
1500                 tcp->u_rval = tcp->u_error = 0;
1501                 if(tcp->u_arg[0] == 0)
1502                         return 0;
1503                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1504                 return RVAL_NONE | RVAL_STR;
1505         }
1506         return 0;
1507 #elif defined(CRISV10) || defined(CRISV32)
1508         struct sigcontext sc;
1509
1510         if (entering(tcp)) {
1511                 long regs[PT_MAX+1];
1512
1513                 tcp->u_arg[0] = 0;
1514
1515                 if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
1516                         perror("sigreturn: PTRACE_GETREGS");
1517                         return 0;
1518                 }
1519                 if (umove(tcp, regs[PT_USP], &sc) < 0)
1520                         return 0;
1521                 tcp->u_arg[0] = 1;
1522                 tcp->u_arg[1] = sc.oldmask;
1523         } else {
1524                 sigset_t sigm;
1525                 long_to_sigset(tcp->u_arg[1], &sigm);
1526                 tcp->u_rval = tcp->u_error = 0;
1527
1528                 if (tcp->u_arg[0] == 0)
1529                         return 0;
1530                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1531                 return RVAL_NONE | RVAL_STR;
1532         }
1533         return 0;
1534 #elif defined(TILE)
1535         struct ucontext uc;
1536         long sp;
1537
1538         /* offset of ucontext in the kernel's sigframe structure */
1539 #       define SIGFRAME_UC_OFFSET C_ABI_SAVE_AREA_SIZE + sizeof(struct siginfo)
1540
1541         if (entering(tcp)) {
1542                 tcp->u_arg[0] = 0;
1543                 if (upeek(tcp, PTREGS_OFFSET_SP, &sp) < 0)
1544                         return 0;
1545                 if (umove(tcp, sp + SIGFRAME_UC_OFFSET, &uc) < 0)
1546                         return 0;
1547                 tcp->u_arg[0] = 1;
1548                 memcpy(tcp->u_arg + 1, &uc.uc_sigmask, sizeof(uc.uc_sigmask));
1549         }
1550         else {
1551                 sigset_t sigm;
1552
1553                 memcpy(&sigm, tcp->u_arg + 1, sizeof (sigm));
1554                 tcp->u_rval = tcp->u_error = 0;
1555                 if (tcp->u_arg[0] == 0)
1556                         return 0;
1557                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1558                 return RVAL_NONE | RVAL_STR;
1559         }
1560         return 0;
1561 #elif defined(MICROBLAZE)
1562         struct sigcontext sc;
1563
1564         /* TODO: Verify that this is correct...  */
1565         if (entering(tcp)) {
1566                 long sp;
1567
1568                 tcp->u_arg[0] = 0;
1569
1570                 /* Read r1, the stack pointer.  */
1571                 if (upeek(tcp, 1 * 4, &sp) < 0)
1572                         return 0;
1573                 if (umove(tcp, sp, &sc) < 0)
1574                         return 0;
1575                 tcp->u_arg[0] = 1;
1576                 tcp->u_arg[1] = sc.oldmask;
1577         } else {
1578                 sigset_t sigm;
1579                 long_to_sigset(tcp->u_arg[1], &sigm);
1580                 tcp->u_rval = tcp->u_error = 0;
1581                 if (tcp->u_arg[0] == 0)
1582                         return 0;
1583                 tcp->auxstr = sprintsigmask("mask now ", &sigm, 0);
1584                 return RVAL_NONE | RVAL_STR;
1585         }
1586         return 0;
1587 #else
1588 #warning No sys_sigreturn() for this architecture
1589 #warning         (no problem, just a reminder :-)
1590         return 0;
1591 #endif
1592 }
1593
1594 int
1595 sys_siggetmask(tcp)
1596 struct tcb *tcp;
1597 {
1598         if (exiting(tcp)) {
1599                 sigset_t sigm;
1600                 long_to_sigset(tcp->u_rval, &sigm);
1601                 tcp->auxstr = sprintsigmask("mask ", &sigm, 0);
1602         }
1603         return RVAL_HEX | RVAL_STR;
1604 }
1605
1606 int
1607 sys_sigsuspend(struct tcb *tcp)
1608 {
1609         if (entering(tcp)) {
1610                 sigset_t sigm;
1611                 long_to_sigset(tcp->u_arg[2], &sigm);
1612                 printsigmask(&sigm, 0);
1613         }
1614         return 0;
1615 }
1616
1617 #endif /* LINUX */
1618
1619 #if defined(SVR4) || defined(FREEBSD)
1620
1621 int
1622 sys_sigsuspend(tcp)
1623 struct tcb *tcp;
1624 {
1625         sigset_t sigset;
1626
1627         if (entering(tcp)) {
1628                 if (umove(tcp, tcp->u_arg[0], &sigset) < 0)
1629                         tprintf("[?]");
1630                 else
1631                         printsigmask(&sigset, 0);
1632         }
1633         return 0;
1634 }
1635 #ifndef FREEBSD
1636 static const struct xlat ucontext_flags[] = {
1637         { UC_SIGMASK,   "UC_SIGMASK"    },
1638         { UC_STACK,     "UC_STACK"      },
1639         { UC_CPU,       "UC_CPU"        },
1640 #ifdef UC_FPU
1641         { UC_FPU,       "UC_FPU"        },
1642 #endif
1643 #ifdef UC_INTR
1644         { UC_INTR,      "UC_INTR"       },
1645 #endif
1646         { 0,            NULL            },
1647 };
1648 #endif /* !FREEBSD */
1649 #endif /* SVR4 || FREEBSD */
1650
1651 #if defined SVR4 || defined LINUX || defined FREEBSD
1652 #if defined LINUX && !defined SS_ONSTACK
1653 #define SS_ONSTACK      1
1654 #define SS_DISABLE      2
1655 #if __GLIBC_MINOR__ == 0
1656 typedef struct
1657 {
1658         __ptr_t ss_sp;
1659         int ss_flags;
1660         size_t ss_size;
1661 } stack_t;
1662 #endif
1663 #endif
1664 #ifdef FREEBSD
1665 #define stack_t struct sigaltstack
1666 #endif
1667
1668 static const struct xlat sigaltstack_flags[] = {
1669         { SS_ONSTACK,   "SS_ONSTACK"    },
1670         { SS_DISABLE,   "SS_DISABLE"    },
1671         { 0,            NULL            },
1672 };
1673 #endif
1674
1675 #ifdef SVR4
1676 static void
1677 printcontext(tcp, ucp)
1678 struct tcb *tcp;
1679 ucontext_t *ucp;
1680 {
1681         tprintf("{");
1682         if (!abbrev(tcp)) {
1683                 tprintf("uc_flags=");
1684                 printflags(ucontext_flags, ucp->uc_flags, "UC_???");
1685                 tprintf(", uc_link=%#lx, ", (unsigned long) ucp->uc_link);
1686         }
1687         tprintf("uc_sigmask=");
1688         printsigmask(&ucp->uc_sigmask, 0);
1689         if (!abbrev(tcp)) {
1690                 tprintf(", uc_stack={ss_sp=%#lx, ss_size=%d, ss_flags=",
1691                         (unsigned long) ucp->uc_stack.ss_sp,
1692                         ucp->uc_stack.ss_size);
1693                 printflags(sigaltstack_flags, ucp->uc_stack.ss_flags, "SS_???");
1694                 tprintf("}");
1695         }
1696         tprintf(", ...}");
1697 }
1698
1699 int
1700 sys_getcontext(tcp)
1701 struct tcb *tcp;
1702 {
1703         ucontext_t uc;
1704
1705         if (exiting(tcp)) {
1706                 if (tcp->u_error)
1707                         tprintf("%#lx", tcp->u_arg[0]);
1708                 else if (!tcp->u_arg[0])
1709                         tprintf("NULL");
1710                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1711                         tprintf("{...}");
1712                 else
1713                         printcontext(tcp, &uc);
1714         }
1715         return 0;
1716 }
1717
1718 int
1719 sys_setcontext(tcp)
1720 struct tcb *tcp;
1721 {
1722         ucontext_t uc;
1723
1724         if (entering(tcp)) {
1725                 if (!tcp->u_arg[0])
1726                         tprintf("NULL");
1727                 else if (umove(tcp, tcp->u_arg[0], &uc) < 0)
1728                         tprintf("{...}");
1729                 else
1730                         printcontext(tcp, &uc);
1731         }
1732         else {
1733                 tcp->u_rval = tcp->u_error = 0;
1734                 if (tcp->u_arg[0] == 0)
1735                         return 0;
1736                 return RVAL_NONE;
1737         }
1738         return 0;
1739 }
1740
1741 #endif /* SVR4 */
1742
1743 #if defined(LINUX) || defined(FREEBSD)
1744
1745 static int
1746 print_stack_t(tcp, addr)
1747 struct tcb *tcp;
1748 unsigned long addr;
1749 {
1750         stack_t ss;
1751         if (umove(tcp, addr, &ss) < 0)
1752                 return -1;
1753         tprintf("{ss_sp=%#lx, ss_flags=", (unsigned long) ss.ss_sp);
1754         printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
1755         tprintf(", ss_size=%lu}", (unsigned long) ss.ss_size);
1756         return 0;
1757 }
1758
1759 int
1760 sys_sigaltstack(tcp)
1761         struct tcb *tcp;
1762 {
1763         if (entering(tcp)) {
1764                 if (tcp->u_arg[0] == 0)
1765                         tprintf("NULL");
1766                 else if (print_stack_t(tcp, tcp->u_arg[0]) < 0)
1767                         return -1;
1768         }
1769         else {
1770                 tprintf(", ");
1771                 if (tcp->u_arg[1] == 0)
1772                         tprintf("NULL");
1773                 else if (print_stack_t(tcp, tcp->u_arg[1]) < 0)
1774                         return -1;
1775         }
1776         return 0;
1777 }
1778 #endif
1779
1780 #ifdef HAVE_SIGACTION
1781
1782 int
1783 sys_sigprocmask(tcp)
1784 struct tcb *tcp;
1785 {
1786 #ifdef ALPHA
1787         if (entering(tcp)) {
1788                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1789                 tprintf(", ");
1790                 printsigmask(tcp->u_arg[1], 0);
1791         }
1792         else if (!syserror(tcp)) {
1793                 tcp->auxstr = sprintsigmask("old mask ", tcp->u_rval, 0);
1794                 return RVAL_HEX | RVAL_STR;
1795         }
1796 #else /* !ALPHA */
1797         if (entering(tcp)) {
1798 #ifdef SVR4
1799                 if (tcp->u_arg[0] == 0)
1800                         tprintf("0");
1801                 else
1802 #endif /* SVR4 */
1803                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1804                 tprintf(", ");
1805                 print_sigset(tcp, tcp->u_arg[1], 0);
1806                 tprintf(", ");
1807         }
1808         else {
1809                 if (!tcp->u_arg[2])
1810                         tprintf("NULL");
1811                 else if (syserror(tcp))
1812                         tprintf("%#lx", tcp->u_arg[2]);
1813                 else
1814                         print_sigset(tcp, tcp->u_arg[2], 0);
1815         }
1816 #endif /* !ALPHA */
1817         return 0;
1818 }
1819
1820 #endif /* HAVE_SIGACTION */
1821
1822 int
1823 sys_kill(tcp)
1824 struct tcb *tcp;
1825 {
1826         if (entering(tcp)) {
1827                 /*
1828                  * Sign-extend a 32-bit value when that's what it is.
1829                  */
1830                 long pid = tcp->u_arg[0];
1831                 if (personality_wordsize[current_personality] < sizeof pid)
1832                         pid = (long) (int) pid;
1833                 tprintf("%ld, %s", pid, signame(tcp->u_arg[1]));
1834         }
1835         return 0;
1836 }
1837
1838 #if defined(FREEBSD) || defined(SUNOS4)
1839 int
1840 sys_killpg(tcp)
1841 struct tcb *tcp;
1842 {
1843         return sys_kill(tcp);
1844 }
1845 #endif /* FREEBSD || SUNOS4 */
1846
1847 #ifdef LINUX
1848 int
1849 sys_tgkill(tcp)
1850         struct tcb *tcp;
1851 {
1852         if (entering(tcp)) {
1853                 tprintf("%ld, %ld, %s",
1854                         tcp->u_arg[0], tcp->u_arg[1], signame(tcp->u_arg[2]));
1855         }
1856         return 0;
1857 }
1858 #endif
1859
1860 int
1861 sys_sigpending(tcp)
1862 struct tcb *tcp;
1863 {
1864         sigset_t sigset;
1865
1866         if (exiting(tcp)) {
1867                 if (syserror(tcp))
1868                         tprintf("%#lx", tcp->u_arg[0]);
1869                 else if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1870                         tprintf("[?]");
1871                 else
1872                         printsigmask(&sigset, 0);
1873         }
1874         return 0;
1875 }
1876
1877 #ifdef SVR4
1878 int sys_sigwait(tcp)
1879 struct tcb *tcp;
1880 {
1881         sigset_t sigset;
1882
1883         if (entering(tcp)) {
1884                 if (copy_sigset(tcp, tcp->u_arg[0], &sigset) < 0)
1885                         tprintf("[?]");
1886                 else
1887                         printsigmask(&sigset, 0);
1888         }
1889         else {
1890                 if (!syserror(tcp)) {
1891                         tcp->auxstr = signalent[tcp->u_rval];
1892                         return RVAL_DECIMAL | RVAL_STR;
1893                 }
1894         }
1895         return 0;
1896 }
1897 #endif /* SVR4 */
1898
1899 #ifdef LINUX
1900
1901         int
1902 sys_rt_sigprocmask(tcp)
1903         struct tcb *tcp;
1904 {
1905         sigset_t sigset;
1906
1907         /* Note: arg[3] is the length of the sigset. */
1908         if (entering(tcp)) {
1909                 printxval(sigprocmaskcmds, tcp->u_arg[0], "SIG_???");
1910                 tprintf(", ");
1911                 if (!tcp->u_arg[1])
1912                         tprintf("NULL, ");
1913                 else if (copy_sigset_len(tcp, tcp->u_arg[1], &sigset, tcp->u_arg[3]) < 0)
1914                         tprintf("%#lx, ", tcp->u_arg[1]);
1915                 else {
1916                         printsigmask(&sigset, 1);
1917                         tprintf(", ");
1918                 }
1919         }
1920         else {
1921                 if (!tcp->u_arg[2])
1922
1923                         tprintf("NULL");
1924                 else if (syserror(tcp))
1925                         tprintf("%#lx", tcp->u_arg[2]);
1926                 else if (copy_sigset_len(tcp, tcp->u_arg[2], &sigset, tcp->u_arg[3]) < 0)
1927                         tprintf("[?]");
1928                 else
1929                         printsigmask(&sigset, 1);
1930                 tprintf(", %lu", tcp->u_arg[3]);
1931         }
1932         return 0;
1933 }
1934
1935
1936 /* Structure describing the action to be taken when a signal arrives.  */
1937 struct new_sigaction
1938 {
1939         __sighandler_t __sa_handler;
1940         unsigned long sa_flags;
1941         void (*sa_restorer) (void);
1942         /* Kernel treats sa_mask as an array of longs. */
1943         unsigned long sa_mask[NSIG / sizeof(long) ? NSIG / sizeof(long) : 1];
1944 };
1945 /* Same for i386-on-x86_64 and similar cases */
1946 struct new_sigaction32
1947 {
1948         uint32_t __sa_handler;
1949         uint32_t sa_flags;
1950         uint32_t sa_restorer;
1951         uint32_t sa_mask[2 * (NSIG / sizeof(long) ? NSIG / sizeof(long) : 1)];
1952 };
1953
1954
1955 int
1956 sys_rt_sigaction(struct tcb *tcp)
1957 {
1958         struct new_sigaction sa;
1959         sigset_t sigset;
1960         long addr;
1961         int r;
1962
1963         if (entering(tcp)) {
1964                 printsignal(tcp->u_arg[0]);
1965                 tprintf(", ");
1966                 addr = tcp->u_arg[1];
1967         } else
1968                 addr = tcp->u_arg[2];
1969
1970         if (addr == 0) {
1971                 tprintf("NULL");
1972                 goto after_sa;
1973         }
1974         if (!verbose(tcp)) {
1975                 tprintf("%#lx", addr);
1976                 goto after_sa;
1977         }
1978 #if SUPPORTED_PERSONALITIES > 1
1979         if (personality_wordsize[current_personality] != sizeof(sa.sa_flags)
1980          && personality_wordsize[current_personality] == 4
1981         ) {
1982                 struct new_sigaction32 sa32;
1983                 r = umove(tcp, addr, &sa32);
1984                 if (r >= 0) {
1985                         memset(&sa, 0, sizeof(sa));
1986                         sa.__sa_handler = (void*)(unsigned long)sa32.__sa_handler;
1987                         sa.sa_flags     = sa32.sa_flags;
1988                         sa.sa_restorer  = (void*)(unsigned long)sa32.sa_restorer;
1989                         /* Kernel treats sa_mask as an array of longs.
1990                          * For 32-bit process, "long" is uint32_t, thus, for example,
1991                          * 32th bit in sa_mask will end up as bit 0 in sa_mask[1].
1992                          * But for (64-bit) kernel, 32th bit in sa_mask is
1993                          * 32th bit in 0th (64-bit) long!
1994                          * For little-endian, it's the same.
1995                          * For big-endian, we swap 32-bit words.
1996                          */
1997                         sa.sa_mask[0] = sa32.sa_mask[0] + ((long)(sa32.sa_mask[1]) << 32);
1998                 }
1999         } else
2000 #endif
2001         {
2002                 r = umove(tcp, addr, &sa);
2003         }
2004         if (r < 0) {
2005                 tprintf("{...}");
2006                 goto after_sa;
2007         }
2008         /* Architectures using function pointers, like
2009          * hppa, may need to manipulate the function pointer
2010          * to compute the result of a comparison. However,
2011          * the SA_HANDLER function pointer exists only in
2012          * the address space of the traced process, and can't
2013          * be manipulated by strace. In order to prevent the
2014          * compiler from generating code to manipulate
2015          * SA_HANDLER we cast the function pointers to long. */
2016         if ((long)sa.__sa_handler == (long)SIG_ERR)
2017                 tprintf("{SIG_ERR, ");
2018         else if ((long)sa.__sa_handler == (long)SIG_DFL)
2019                 tprintf("{SIG_DFL, ");
2020         else if ((long)sa.__sa_handler == (long)SIG_IGN)
2021                 tprintf("{SIG_IGN, ");
2022         else
2023                 tprintf("{%#lx, ", (long) sa.__sa_handler);
2024         /* Questionable code below.
2025          * Kernel won't handle sys_rt_sigaction
2026          * with wrong sigset size (just returns EINVAL)
2027          * therefore tcp->u_arg[3(4)] _must_ be NSIG / 8 here,
2028          * and we always use smaller memcpy. */
2029         sigemptyset(&sigset);
2030 #ifdef LINUXSPARC
2031         if (tcp->u_arg[4] <= sizeof(sigset))
2032                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[4]);
2033 #else
2034         if (tcp->u_arg[3] <= sizeof(sigset))
2035                 memcpy(&sigset, &sa.sa_mask, tcp->u_arg[3]);
2036 #endif
2037         else
2038                 memcpy(&sigset, &sa.sa_mask, sizeof(sigset));
2039         printsigmask(&sigset, 1);
2040         tprintf(", ");
2041         printflags(sigact_flags, sa.sa_flags, "SA_???");
2042 #ifdef SA_RESTORER
2043         if (sa.sa_flags & SA_RESTORER)
2044                 tprintf(", %p", sa.sa_restorer);
2045 #endif
2046         tprintf("}");
2047
2048  after_sa:
2049         if (entering(tcp))
2050                 tprintf(", ");
2051         else
2052 #ifdef LINUXSPARC
2053                 tprintf(", %#lx, %lu", tcp->u_arg[3], tcp->u_arg[4]);
2054 #elif defined(ALPHA)
2055                 tprintf(", %lu, %#lx", tcp->u_arg[3], tcp->u_arg[4]);
2056 #else
2057                 tprintf(", %lu", tcp->u_arg[3]);
2058 #endif
2059         return 0;
2060 }
2061
2062 int
2063 sys_rt_sigpending(struct tcb *tcp)
2064 {
2065         sigset_t sigset;
2066
2067         if (exiting(tcp)) {
2068                 if (syserror(tcp))
2069                         tprintf("%#lx", tcp->u_arg[0]);
2070                 else if (copy_sigset_len(tcp, tcp->u_arg[0],
2071                                          &sigset, tcp->u_arg[1]) < 0)
2072                         tprintf("[?]");
2073                 else
2074                         printsigmask(&sigset, 1);
2075         }
2076         return 0;
2077 }
2078
2079 int
2080 sys_rt_sigsuspend(struct tcb *tcp)
2081 {
2082         if (entering(tcp)) {
2083                 sigset_t sigm;
2084                 if (copy_sigset_len(tcp, tcp->u_arg[0], &sigm, tcp->u_arg[1]) < 0)
2085                         tprintf("[?]");
2086                 else
2087                         printsigmask(&sigm, 1);
2088         }
2089         return 0;
2090 }
2091
2092 int
2093 sys_rt_sigqueueinfo(struct tcb *tcp)
2094 {
2095         if (entering(tcp)) {
2096                 siginfo_t si;
2097                 tprintf("%lu, ", tcp->u_arg[0]);
2098                 printsignal(tcp->u_arg[1]);
2099                 tprintf(", ");
2100                 if (umove(tcp, tcp->u_arg[2], &si) < 0)
2101                         tprintf("%#lx", tcp->u_arg[2]);
2102                 else
2103                         printsiginfo(&si, verbose(tcp));
2104         }
2105         return 0;
2106 }
2107
2108 int sys_rt_sigtimedwait(struct tcb *tcp)
2109 {
2110         if (entering(tcp)) {
2111                 sigset_t sigset;
2112
2113                 if (copy_sigset_len(tcp, tcp->u_arg[0],
2114                                     &sigset, tcp->u_arg[3]) < 0)
2115                         tprintf("[?]");
2116                 else
2117                         printsigmask(&sigset, 1);
2118                 tprintf(", ");
2119                 /* This is the only "return" parameter, */
2120                 if (tcp->u_arg[1] != 0)
2121                         return 0;
2122                 /* ... if it's NULL, can decode all on entry */
2123                 tprintf("NULL, ");
2124         }
2125         else if (tcp->u_arg[1] != 0) {
2126                 /* syscall exit, and u_arg[1] wasn't NULL */
2127                 if (syserror(tcp))
2128                         tprintf("%#lx, ", tcp->u_arg[1]);
2129                 else {
2130                         siginfo_t si;
2131                         if (umove(tcp, tcp->u_arg[1], &si) < 0)
2132                                 tprintf("%#lx, ", tcp->u_arg[1]);
2133                         else {
2134                                 printsiginfo(&si, verbose(tcp));
2135                                 tprintf(", ");
2136                         }
2137                 }
2138         }
2139         else {
2140                 /* syscall exit, and u_arg[1] was NULL */
2141                 return 0;
2142         }
2143         print_timespec(tcp, tcp->u_arg[2]);
2144         tprintf(", %d", (int) tcp->u_arg[3]);
2145         return 0;
2146 };
2147
2148 int
2149 sys_restart_syscall(struct tcb *tcp)
2150 {
2151         if (entering(tcp))
2152                 tprintf("<... resuming interrupted call ...>");
2153         return 0;
2154 }
2155
2156 static int
2157 do_signalfd(struct tcb *tcp, int flags_arg)
2158 {
2159         if (entering(tcp)) {
2160                 printfd(tcp, tcp->u_arg[0]);
2161                 tprintf(", ");
2162                 print_sigset(tcp, tcp->u_arg[1], 1);
2163                 tprintf(", %lu", tcp->u_arg[2]);
2164                 if (flags_arg >= 0) {
2165                         tprintf(", ");
2166                         printflags(open_mode_flags, tcp->u_arg[flags_arg], "O_???");
2167                 }
2168         }
2169         return 0;
2170 }
2171
2172 int
2173 sys_signalfd(struct tcb *tcp)
2174 {
2175         return do_signalfd(tcp, -1);
2176 }
2177
2178 int
2179 sys_signalfd4(struct tcb *tcp)
2180 {
2181         return do_signalfd(tcp, 3);
2182 }
2183 #endif /* LINUX */