arch/mips/kernel/irixsig.c

   1 /*
   2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatable or what?!?!
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/mm.h>
  11 #include <linux/errno.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/time.h>
  15
  16 #include <asm/ptrace.h>
  17 #include <asm/uaccess.h>
  18
  19 extern asmlinkage void syscall_trace(void);
  20
  21 #undef DEBUG_SIG
  22
  23 #define _S(nr) (1<<((nr)-1))
  24
  25 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  26
  27 typedef struct {
  28         unsigned long sig[4];
  29 } irix_sigset_t;
  30
  31 struct sigctx_irix5 {
  32         u32 rmask, cp0_status;
  33         u64 pc;
  34         u64 regs[32];
  35         u64 fpregs[32];
  36         u32 usedfp, fpcsr, fpeir, sstk_flags;
  37         u64 hi, lo;
  38         u64 cp0_cause, cp0_badvaddr, _unused0;
  39         irix_sigset_t sigset;
  40         u64 weird_fpu_thing;
  41         u64 _unused1[31];
  42 };
  43
  44 #ifdef DEBUG_SIG
  45 /* Debugging */
  46 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  47 {
  48         int i;
  49
  50         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  51                (unsigned long) c->rmask,
  52                (unsigned long) c->cp0_status,
  53                (unsigned long) c->pc);
  54         printk("regs: ");
  55         for(i = 0; i < 16; i++)
  56                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  57         printk("\nregs: ");
  58         for(i = 16; i < 32; i++)
  59                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  60         printk("\nfpregs: ");
  61         for(i = 0; i < 16; i++)
  62                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  63         printk("\nfpregs: ");
  64         for(i = 16; i < 32; i++)
  65                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  66         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  67                (int) c->usedfp, (unsigned long) c->fpcsr,
  68                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  69         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  70                (unsigned long) c->hi, (unsigned long) c->lo,
  71                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  72         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  73                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  74                (unsigned long) c->sigset.sig[1],
  75                (unsigned long) c->sigset.sig[2],
  76                (unsigned long) c->sigset.sig[3]);
  77 }
  78 #endif
  79
  80 static void setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  81                              int signr, sigset_t *oldmask)
  82 {
  83         unsigned long sp;
  84         struct sigctx_irix5 *ctx;
  85         int i;
  86
  87         sp = regs->regs[29];
  88         sp -= sizeof(struct sigctx_irix5);
  89         sp &= ~(0xf);
  90         ctx = (struct sigctx_irix5 *) sp;
  91         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  92                 goto segv_and_exit;
  93
  94         __put_user(0, &ctx->weird_fpu_thing);
  95         __put_user(~(0x00000001), &ctx->rmask);
  96         __put_user(0, &ctx->regs[0]);
  97         for(i = 1; i < 32; i++)
  98                 __put_user((u64) regs->regs[i], &ctx->regs[i]);
  99
 100         __put_user((u64) regs->hi, &ctx->hi);
 101         __put_user((u64) regs->lo, &ctx->lo);
 102         __put_user((u64) regs->cp0_epc, &ctx->pc);
 103         __put_user(current->used_math, &ctx->usedfp);
 104         __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 105         __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 106
 107         __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 108
 109         __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t));
 110
 111 #ifdef DEBUG_SIG
 112         dump_irix5_sigctx(ctx);
 113 #endif
 114
 115         regs->regs[4] = (unsigned long) signr;
 116         regs->regs[5] = 0; /* XXX sigcode XXX */
 117         regs->regs[6] = regs->regs[29] = sp;
 118         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 119         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 120
 121         return;
 122
 123 segv_and_exit:
 124         if (signr == SIGSEGV)
 125                 ka->sa.sa_handler = SIG_DFL;
 126         force_sig(SIGSEGV, current);
 127 }
 128
 129 static void inline
 130 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 131                int signr, sigset_t *oldmask, siginfo_t *info)
 132 {
 133         printk("Aiee: setup_tr_frame wants to be written");
 134         do_exit(SIGSEGV);
 135 }
 136
 137 static inline void handle_signal(unsigned long sig, struct k_sigaction *ka,
 138         siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
 139 {
 140         if (ka->sa.sa_flags & SA_SIGINFO)
 141                 setup_irix_rt_frame(ka, regs, sig, oldset, info);
 142         else
 143                 setup_irix_frame(ka, regs, sig, oldset);
 144
 145         if (ka->sa.sa_flags & SA_ONESHOT)
 146                 ka->sa.sa_handler = SIG_DFL;
 147         if (!(ka->sa.sa_flags & SA_NODEFER)) {
 148                 spin_lock_irq(&current->sigmask_lock);
 149                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 150         sigaddset(&current->blocked,sig);
 151         recalc_sigpending(current);
 152         spin_unlock_irq(&current->sigmask_lock);
 153         }
 154 }
 155
 156 static inline void syscall_restart(struct pt_regs *regs, struct k_sigaction *ka)
 157 {
 158         switch(regs->regs[0]) {
 159         case ERESTARTNOHAND:
 160                 regs->regs[2] = EINTR;
 161                 break;
 162         case ERESTARTSYS:
 163                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 164                         regs->regs[2] = EINTR;
 165                         break;
 166                 }
 167         /* fallthrough */
 168         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 169                 regs->cp0_epc -= 8;
 170         }
 171
 172         regs->regs[0] = 0;              /* Don't deal with this again.  */
 173 }
 174
 175 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 176 {
 177         struct k_sigaction *ka;
 178         siginfo_t info;
 179
 180         if (!oldset)
 181                 oldset = &current->blocked;
 182
 183         for (;;) {
 184                 unsigned long signr;
 185
 186                 spin_lock_irq(&current->sigmask_lock);
 187                 signr = dequeue_signal(&current->blocked, &info);
 188                 spin_unlock_irq(&current->sigmask_lock);
 189
 190                 if (!signr)
 191                         break;
 192
 193                 if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
 194                         /* Let the debugger run.  */
 195                         current->exit_code = signr;
 196                         current->state = TASK_STOPPED;
 197                         notify_parent(current, SIGCHLD);
 198                         schedule();
 199
 200                         /* We're back.  Did the debugger cancel the sig?  */
 201                         if (!(signr = current->exit_code))
 202                                 continue;
 203                         current->exit_code = 0;
 204
 205                         /* The debugger continued.  Ignore SIGSTOP.  */
 206                         if (signr == SIGSTOP)
 207                                 continue;
 208
 209                         /* Update the siginfo structure.  Is this good?  */
 210                         if (signr != info.si_signo) {
 211                                 info.si_signo = signr;
 212                                 info.si_errno = 0;
 213                                 info.si_code = SI_USER;
 214                                 info.si_pid = current->p_pptr->pid;
 215                                 info.si_uid = current->p_pptr->uid;
 216                         }
 217
 218                         /* If the (new) signal is now blocked, requeue it.  */
 219                         if (sigismember(&current->blocked, signr)) {
 220                                 send_sig_info(signr, &info, current);
 221                                 continue;
 222                         }
 223                 }
 224
 225                 ka = &current->sig->action[signr-1];
 226                 if (ka->sa.sa_handler == SIG_IGN) {
 227                         if (signr != SIGCHLD)
 228                                 continue;
 229                         /* Check for SIGCHLD: it's special.  */
 230                         while (sys_wait4(-1, NULL, WNOHANG, NULL) > 0)
 231                                 /* nothing */;
 232                         continue;
 233                 }
 234
 235                 if (ka->sa.sa_handler == SIG_DFL) {
 236                         int exit_code = signr;
 237
 238                         /* Init gets no signals it doesn't want.  */
 239                         if (current->pid == 1)
 240                                 continue;
 241
 242                         switch (signr) {
 243                         case SIGCONT: case SIGCHLD: case SIGWINCH:
 244                                 continue;
 245
 246                         case SIGTSTP: case SIGTTIN: case SIGTTOU:
 247                                 if (is_orphaned_pgrp(current->pgrp))
 248                                         continue;
 249                                 /* FALLTHRU */
 250
 251                         case SIGSTOP:
 252                                 current->state = TASK_STOPPED;
 253                                 current->exit_code = signr;
 254                                 if (!(current->p_pptr->sig->action[SIGCHLD-1].sa.sa_flags & SA_NOCLDSTOP))
 255                                         notify_parent(current, SIGCHLD);
 256                                 schedule();
 257                                 continue;
 258
 259                         case SIGQUIT: case SIGILL: case SIGTRAP:
 260                         case SIGABRT: case SIGFPE: case SIGSEGV:
 261                                 if (do_coredump(signr, regs))
 262                                         exit_code |= 0x80;
 263                                 /* FALLTHRU */
 264
 265                         default:
 266                                 sigaddset(&current->pending.signal, signr);
 267                                 recalc_sigpending(current);
 268                                 current->flags |= PF_SIGNALED;
 269                                 do_exit(exit_code);
 270                                 /* NOTREACHED */
 271                         }
 272                 }
 273
 274                 if (regs->regs[0])
 275                         syscall_restart(regs, ka);
 276                 /* Whee!  Actually deliver the signal.  */
 277                 handle_signal(signr, ka, &info, oldset, regs);
 278                 return 1;
 279         }
 280
 281         /*
 282          * Who's code doesn't conform to the restartable syscall convention
 283          * dies here!!!  The li instruction, a single machine instruction,
 284          * must directly be followed by the syscall instruction.
 285          */
 286         if (regs->regs[0]) {
 287                 if (regs->regs[2] == ERESTARTNOHAND ||
 288                     regs->regs[2] == ERESTARTSYS ||
 289                     regs->regs[2] == ERESTARTNOINTR) {
 290                         regs->cp0_epc -= 8;
 291                 }
 292         }
 293         return 0;
 294 }
 295
 296 asmlinkage void
 297 irix_sigreturn(struct pt_regs *regs)
 298 {
 299         struct sigctx_irix5 *context, *magic;
 300         unsigned long umask, mask;
 301         u64 *fregs;
 302         int sig, i, base = 0;
 303         sigset_t blocked;
 304
 305         if(regs->regs[2] == 1000)
 306                 base = 1;
 307
 308         context = (struct sigctx_irix5 *) regs->regs[base + 4];
 309         magic = (struct sigctx_irix5 *) regs->regs[base + 5];
 310         sig = (int) regs->regs[base + 6];
 311 #ifdef DEBUG_SIG
 312         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 313                current->comm, current->pid, context, magic, sig);
 314 #endif
 315         if (!context)
 316                 context = magic;
 317         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 318                 goto badframe;
 319
 320 #ifdef DEBUG_SIG
 321         dump_irix5_sigctx(context);
 322 #endif
 323
 324         __get_user(regs->cp0_epc, &context->pc);
 325         umask = context->rmask; mask = 2;
 326         for (i = 1; i < 32; i++, mask <<= 1) {
 327                 if(umask & mask)
 328                         __get_user(regs->regs[i], &context->regs[i]);
 329         }
 330         __get_user(regs->hi, &context->hi);
 331         __get_user(regs->lo, &context->lo);
 332
 333         if ((umask & 1) && context->usedfp) {
 334                 fregs = (u64 *) &current->thread.fpu;
 335                 for(i = 0; i < 32; i++)
 336                         fregs[i] = (u64) context->fpregs[i];
 337                 __get_user(current->thread.fpu.hard.control, &context->fpcsr);
 338         }
 339
 340         /* XXX do sigstack crapola here... XXX */
 341
 342         if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
 343                 goto badframe;
 344
 345         sigdelsetmask(&blocked, ~_BLOCKABLE);
 346         spin_lock_irq(&current->sigmask_lock);
 347         current->blocked = blocked;
 348         recalc_sigpending(current);
 349         spin_unlock_irq(&current->sigmask_lock);
 350
 351         /*
 352          * Don't let your children do this ...
 353          */
 354         if (current->ptrace & PT_TRACESYS)
 355                 syscall_trace();
 356         __asm__ __volatile__(
 357                 "move\t$29,%0\n\t"
 358                 "j\tret_from_sys_call"
 359                 :/* no outputs */
 360                 :"r" (&regs));
 361                 /* Unreached */
 362
 363 badframe:
 364         force_sig(SIGSEGV, current);
 365 }
 366
 367 struct sigact_irix5 {
 368         int flags;
 369         void (*handler)(int);
 370         u32 sigset[4];
 371         int _unused0[2];
 372 };
 373
 374 #ifdef DEBUG_SIG
 375 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 376 {
 377         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 378                (unsigned long) p->handler,
 379                (unsigned long) p->sigset[0]);
 380 }
 381 #endif
 382
 383 asmlinkage int
 384 irix_sigaction(int sig, const struct sigaction *act,
 385               struct sigaction *oact, void *trampoline)
 386 {
 387         struct k_sigaction new_ka, old_ka;
 388         int ret;
 389
 390 #ifdef DEBUG_SIG
 391         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 392                (!old ? "0" : "OLD"), trampoline);
 393         if(new) {
 394                 dump_sigact_irix5(new); printk(" ");
 395         }
 396 #endif
 397         if (act) {
 398                 sigset_t mask;
 399                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 400                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 401                     __get_user(new_ka.sa.sa_flags, &act->sa_flags))
 402                         return -EFAULT;
 403
 404                 __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t));
 405
 406                 /*
 407                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 408                  * value for all invocations of sigaction.  Will have to
 409                  * investigate.  POSIX POSIX, die die die...
 410                  */
 411                 new_ka.sa_restorer = trampoline;
 412         }
 413
 414 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 415         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 416
 417         if (!ret && oact) {
 418                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 419                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 420                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
 421                         return -EFAULT;
 422                 __copy_to_user(&old_ka.sa.sa_mask, &oact->sa_mask,
 423                                sizeof(sigset_t));
 424         }
 425
 426         return ret;
 427 }
 428
 429 asmlinkage int irix_sigpending(irix_sigset_t *set)
 430 {
 431         return do_sigpending(set, sizeof(*set));
 432 }
 433
 434 asmlinkage int irix_sigprocmask(int how, irix_sigset_t *new, irix_sigset_t *old)
 435 {
 436         sigset_t oldbits, newbits;
 437         int error;
 438
 439         if (new) {
 440                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 441                 if (error)
 442                         return error;
 443                 __copy_from_user(&newbits, new, sizeof(unsigned long)*4);
 444                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 445
 446                 spin_lock_irq(&current->sigmask_lock);
 447                 oldbits = current->blocked;
 448
 449                 switch(how) {
 450                 case 1:
 451                         sigorsets(&newbits, &oldbits, &newbits);
 452                         break;
 453
 454                 case 2:
 455                         sigandsets(&newbits, &oldbits, &newbits);
 456                         break;
 457
 458                 case 3:
 459                         break;
 460
 461                 case 256:
 462                         siginitset(&newbits, newbits.sig[0]);
 463                         break;
 464
 465                 default:
 466                         return -EINVAL;
 467                 }
 468                 recalc_sigpending(current);
 469                 spin_unlock_irq(&current->sigmask_lock);
 470         }
 471         if(old) {
 472                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 473                 if(error)
 474                         return error;
 475                 __copy_to_user(old, &current->blocked, sizeof(unsigned long)*4);
 476         }
 477
 478         return 0;
 479 }
 480
 481 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 482 {
 483         sigset_t *uset, saveset, newset;
 484
 485         uset = (sigset_t *) regs->regs[4];
 486         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 487                 return -EFAULT;
 488         sigdelsetmask(&newset, ~_BLOCKABLE);
 489
 490         spin_lock_irq(&current->sigmask_lock);
 491         saveset = current->blocked;
 492         current->blocked = newset;
 493         recalc_sigpending(current);
 494         spin_unlock_irq(&current->sigmask_lock);
 495
 496         regs->regs[2] = -EINTR;
 497         while (1) {
 498                 current->state = TASK_INTERRUPTIBLE;
 499                 schedule();
 500                 if (do_irix_signal(&saveset, regs))
 501                         return -EINTR;
 502         }
 503 }
 504
 505 /* hate hate hate... */
 506 struct irix5_siginfo {
 507         int sig, code, error;
 508         union {
 509                 char unused[128 - (3 * 4)]; /* Safety net. */
 510                 struct {
 511                         int pid;
 512                         union {
 513                                 int uid;
 514                                 struct {
 515                                         int utime, status, stime;
 516                                 } child;
 517                         } procdata;
 518                 } procinfo;
 519
 520                 unsigned long fault_addr;
 521
 522                 struct {
 523                         int fd;
 524                         long band;
 525                 } fileinfo;
 526
 527                 unsigned long sigval;
 528         } stuff;
 529 };
 530
 531 static inline unsigned long timespectojiffies(struct timespec *value)
 532 {
 533         unsigned long sec = (unsigned) value->tv_sec;
 534         long nsec = value->tv_nsec;
 535
 536         if (sec > (LONG_MAX / HZ))
 537                 return LONG_MAX;
 538         nsec += 1000000000L / HZ - 1;
 539         nsec /= 1000000000L / HZ;
 540         return HZ * sec + nsec;
 541 }
 542
 543 asmlinkage int irix_sigpoll_sys(unsigned long *set, struct irix5_siginfo *info,
 544                                 struct timespec *tp)
 545 {
 546         long expire = MAX_SCHEDULE_TIMEOUT;
 547         sigset_t kset;
 548         int i, sig, error, timeo = 0;
 549
 550 #ifdef DEBUG_SIG
 551         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 552                current->comm, current->pid, set, info, tp);
 553 #endif
 554
 555         /* Must always specify the signal set. */
 556         if(!set)
 557                 return -EINVAL;
 558
 559         error = verify_area(VERIFY_READ, set, sizeof(kset));
 560         if (error)
 561                 goto out;
 562
 563         __copy_from_user(&kset, set, sizeof(set));
 564         if (error)
 565                 goto out;
 566
 567         if (info && clear_user(info, sizeof(*info))) {
 568                 error = -EFAULT;
 569                 goto out;
 570         }
 571
 572         if(tp) {
 573                 error = verify_area(VERIFY_READ, tp, sizeof(*tp));
 574                 if(error)
 575                         return error;
 576                 if(!tp->tv_sec && !tp->tv_nsec) {
 577                         error = -EINVAL;
 578                         goto out;
 579                 }
 580                 expire = timespectojiffies(tp)+(tp->tv_sec||tp->tv_nsec);
 581         }
 582
 583         while(1) {
 584                 long tmp = 0;
 585
 586                 current->state = TASK_INTERRUPTIBLE;
 587                 expire = schedule_timeout(expire);
 588
 589                 for (i=0; i<=4; i++)
 590                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 591
 592                 if (tmp)
 593                         break;
 594                 if (!expire) {
 595                         timeo = 1;
 596                         break;
 597                 }
 598                 if (signal_pending(current))
 599                         return -EINTR;
 600         }
 601         if (timeo)
 602                 return -EAGAIN;
 603
 604         for(sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 605                 if (sigismember (&kset, sig))
 606                         continue;
 607                 if (sigismember (&current->pending.signal, sig)) {
 608                         /* XXX need more than this... */
 609                         if (info)
 610                                 info->sig = sig;
 611                         error = 0;
 612                         goto out;
 613                 }
 614         }
 615
 616         /* Should not get here, but do something sane if we do. */
 617         error = -EINTR;
 618
 619 out:
 620         return error;
 621 }
 622
 623 /* This is here because of irix5_siginfo definition. */
 624 #define P_PID    0
 625 #define P_PGID   2
 626 #define P_ALL    7
 627
 628 extern int getrusage(struct task_struct *, int, struct rusage *);
 629
 630 #define W_EXITED     1
 631 #define W_TRAPPED    2
 632 #define W_STOPPED    4
 633 #define W_CONT       8
 634 #define W_NOHANG    64
 635
 636 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 637
 638 asmlinkage int irix_waitsys(int type, int pid, struct irix5_siginfo *info,
 639                             int options, struct rusage *ru)
 640 {
 641         int flag, retval;
 642         DECLARE_WAITQUEUE(wait, current);
 643         struct task_struct *p;
 644
 645         if (!info) {
 646                 retval = -EINVAL;
 647                 goto out;
 648         }
 649         retval = verify_area(VERIFY_WRITE, info, sizeof(*info));
 650         if(retval)
 651                 goto out;
 652         if (ru) {
 653                 retval = verify_area(VERIFY_WRITE, ru, sizeof(*ru));
 654                 if(retval)
 655                         goto out;
 656         }
 657         if (options & ~(W_MASK)) {
 658                 retval = -EINVAL;
 659                 goto out;
 660         }
 661         if (type != P_PID && type != P_PGID && type != P_ALL) {
 662                 retval = -EINVAL;
 663                 goto out;
 664         }
 665         add_wait_queue(&current->wait_chldexit, &wait);
 666 repeat:
 667         flag = 0;
 668         current->state = TASK_INTERRUPTIBLE;
 669         read_lock(&tasklist_lock);
 670         for (p = current->p_cptr; p; p = p->p_osptr) {
 671                 if ((type == P_PID) && p->pid != pid)
 672                         continue;
 673                 if ((type == P_PGID) && p->pgrp != pid)
 674                         continue;
 675                 if ((p->exit_signal != SIGCHLD))
 676                         continue;
 677                 flag = 1;
 678                 switch (p->state) {
 679                 case TASK_STOPPED:
 680                         if (!p->exit_code)
 681                                 continue;
 682                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 683                             !(p->ptrace & PT_PTRACED))
 684                                 continue;
 685                         read_unlock(&tasklist_lock);
 686                         if (ru != NULL)
 687                                 getrusage(p, RUSAGE_BOTH, ru);
 688                         __put_user(SIGCHLD, &info->sig);
 689                         __put_user(0, &info->code);
 690                         __put_user(p->pid, &info->stuff.procinfo.pid);
 691                         __put_user((p->exit_code >> 8) & 0xff,
 692                                    &info->stuff.procinfo.procdata.child.status);
 693                         __put_user(p->times.tms_utime, &info->stuff.procinfo.procdata.child.utime);
 694                         __put_user(p->times.tms_stime, &info->stuff.procinfo.procdata.child.stime);
 695                         p->exit_code = 0;
 696                         retval = 0;
 697                         goto end_waitsys;
 698                 case TASK_ZOMBIE:
 699                         current->times.tms_cutime += p->times.tms_utime + p->times.tms_cutime;
 700                         current->times.tms_cstime += p->times.tms_stime + p->times.tms_cstime;
 701                         read_unlock(&tasklist_lock);
 702                         if (ru != NULL)
 703                                 getrusage(p, RUSAGE_BOTH, ru);
 704                         __put_user(SIGCHLD, &info->sig);
 705                         __put_user(1, &info->code);      /* CLD_EXITED */
 706                         __put_user(p->pid, &info->stuff.procinfo.pid);
 707                         __put_user((p->exit_code >> 8) & 0xff,
 708                                    &info->stuff.procinfo.procdata.child.status);
 709                         __put_user(p->times.tms_utime,
 710                                    &info->stuff.procinfo.procdata.child.utime);
 711                         __put_user(p->times.tms_stime,
 712                                    &info->stuff.procinfo.procdata.child.stime);
 713                         retval = 0;
 714                         if (p->p_opptr != p->p_pptr) {
 715                                 write_lock_irq(&tasklist_lock);
 716                                 REMOVE_LINKS(p);
 717                                 p->p_pptr = p->p_opptr;
 718                                 SET_LINKS(p);
 719                                 notify_parent(p, SIGCHLD);
 720                                 write_unlock_irq(&tasklist_lock);
 721                         } else
 722                                 release_task(p);
 723                         goto end_waitsys;
 724                 default:
 725                         continue;
 726                 }
 727         }
 728         read_unlock(&tasklist_lock);
 729         if (flag) {
 730                 retval = 0;
 731                 if (options & W_NOHANG)
 732                         goto end_waitsys;
 733                 retval = -ERESTARTSYS;
 734                 if (signal_pending(current))
 735                         goto end_waitsys;
 736                 current->state = TASK_INTERRUPTIBLE;
 737                 schedule();
 738                 goto repeat;
 739         }
 740         retval = -ECHILD;
 741 end_waitsys:
 742         current->state = TASK_RUNNING;
 743         remove_wait_queue(&current->wait_chldexit, &wait);
 744
 745 out:
 746         return retval;
 747 }
 748
 749 struct irix5_context {
 750         u32 flags;
 751         u32 link;
 752         u32 sigmask[4];
 753         struct { u32 sp, size, flags; } stack;
 754         int regs[36];
 755         u32 fpregs[32];
 756         u32 fpcsr;
 757         u32 _unused0;
 758         u32 _unused1[47];
 759         u32 weird_graphics_thing;
 760 };
 761
 762 asmlinkage int irix_getcontext(struct pt_regs *regs)
 763 {
 764         int error, i, base = 0;
 765         struct irix5_context *ctx;
 766         unsigned long flags;
 767
 768         if (regs->regs[2] == 1000)
 769                 base = 1;
 770         ctx = (struct irix5_context *) regs->regs[base + 4];
 771
 772 #ifdef DEBUG_SIG
 773         printk("[%s:%d] irix_getcontext(%p)\n",
 774                current->comm, current->pid, ctx);
 775 #endif
 776
 777         error = verify_area(VERIFY_WRITE, ctx, sizeof(*ctx));
 778         if(error)
 779                 goto out;
 780         __put_user(current->thread.irix_oldctx, &ctx->link);
 781
 782         __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t));
 783
 784         /* XXX Do sigstack stuff someday... */
 785         __put_user(0, &ctx->stack.sp);
 786         __put_user(0, &ctx->stack.size);
 787         __put_user(0, &ctx->stack.flags);
 788
 789         __put_user(0, &ctx->weird_graphics_thing);
 790         __put_user(0, &ctx->regs[0]);
 791         for (i = 1; i < 32; i++)
 792                 __put_user(regs->regs[i], &ctx->regs[i]);
 793         __put_user(regs->lo, &ctx->regs[32]);
 794         __put_user(regs->hi, &ctx->regs[33]);
 795         __put_user(regs->cp0_cause, &ctx->regs[34]);
 796         __put_user(regs->cp0_epc, &ctx->regs[35]);
 797
 798         flags = 0x0f;
 799         if(!current->used_math) {
 800                 flags &= ~(0x08);
 801         } else {
 802                 /* XXX wheee... */
 803                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 804         }
 805         __put_user(flags, &ctx->flags);
 806         error = 0;
 807
 808 out:
 809         return error;
 810 }
 811
 812 asmlinkage unsigned long irix_setcontext(struct pt_regs *regs)
 813 {
 814         int error, base = 0;
 815         struct irix5_context *ctx;
 816
 817         if(regs->regs[2] == 1000)
 818                 base = 1;
 819         ctx = (struct irix5_context *) regs->regs[base + 4];
 820
 821 #ifdef DEBUG_SIG
 822         printk("[%s:%d] irix_setcontext(%p)\n",
 823                current->comm, current->pid, ctx);
 824 #endif
 825
 826         error = verify_area(VERIFY_READ, ctx, sizeof(*ctx));
 827         if (error)
 828                 goto out;
 829
 830         if (ctx->flags & 0x02) {
 831                 /* XXX sigstack garbage, todo... */
 832                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 833         }
 834
 835         if (ctx->flags & 0x04) {
 836                 int i;
 837
 838                 /* XXX extra control block stuff... todo... */
 839                 for(i = 1; i < 32; i++)
 840                         regs->regs[i] = ctx->regs[i];
 841                 regs->lo = ctx->regs[32];
 842                 regs->hi = ctx->regs[33];
 843                 regs->cp0_epc = ctx->regs[35];
 844         }
 845
 846         if (ctx->flags & 0x08) {
 847                 /* XXX fpu context, blah... */
 848                 printk("Wheee, cannot restore FPU context yet...\n");
 849         }
 850         current->thread.irix_oldctx = ctx->link;
 851         error = regs->regs[2];
 852
 853 out:
 854         return error;
 855 }
 856
 857 struct irix_sigstack { unsigned long sp; int status; };
 858
 859 asmlinkage int irix_sigstack(struct irix_sigstack *new, struct irix_sigstack *old)
 860 {
 861         int error;
 862
 863 #ifdef DEBUG_SIG
 864         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 865                current->comm, current->pid, new, old);
 866 #endif
 867         if(new) {
 868                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 869                 if(error)
 870                         goto out;
 871         }
 872
 873         if(old) {
 874                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 875                 if(error)
 876                         goto out;
 877         }
 878         error = 0;
 879
 880 out:
 881         return error;
 882 }
 883
 884 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 885
 886 asmlinkage int irix_sigaltstack(struct irix_sigaltstack *new,
 887                                 struct irix_sigaltstack *old)
 888 {
 889         int error;
 890
 891 #ifdef DEBUG_SIG
 892         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 893                current->comm, current->pid, new, old);
 894 #endif
 895         if (new) {
 896                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 897                 if(error)
 898                         goto out;
 899         }
 900
 901         if (old) {
 902                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 903                 if(error)
 904                         goto out;
 905         }
 906         error = 0;
 907
 908 out:
 909         error = 0;
 910
 911         return error;
 912 }
 913
 914 struct irix_procset {
 915         int cmd, ltype, lid, rtype, rid;
 916 };
 917
 918 asmlinkage int irix_sigsendset(struct irix_procset *pset, int sig)
 919 {
 920         int error;
 921
 922         error = verify_area(VERIFY_READ, pset, sizeof(*pset));
 923         if(error)
 924                 goto out;
 925 #ifdef DEBUG_SIG
 926         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 927                current->comm, current->pid,
 928                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 929                sig);
 930 #endif
 931         error = -EINVAL;
 932
 933 out:
 934         return error;
 935 }