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