arch/mips/kernel/irixsig.c

   1 /*
   2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible 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/time.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/resource.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19 #include <asm/unistd.h>
  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 int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  81                             int signr, sigset_t *oldmask)
  82 {
  83         struct sigctx_irix5 __user *ctx;
  84         unsigned long sp;
  85         int error, i;
  86
  87         sp = regs->regs[29];
  88         sp -= sizeof(struct sigctx_irix5);
  89         sp &= ~(0xf);
  90         ctx = (struct sigctx_irix5 __user *) sp;
  91         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  92                 goto segv_and_exit;
  93
  94         error = __put_user(0, &ctx->weird_fpu_thing);
  95         error |= __put_user(~(0x00000001), &ctx->rmask);
  96         error |= __put_user(0, &ctx->regs[0]);
  97         for(i = 1; i < 32; i++)
  98                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
  99
 100         error |= __put_user((u64) regs->hi, &ctx->hi);
 101         error |= __put_user((u64) regs->lo, &ctx->lo);
 102         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 103         error |= __put_user(!!used_math(), &ctx->usedfp);
 104         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 105         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 106
 107         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 108
 109         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 110
 111         if (error)
 112                 goto segv_and_exit;
 113
 114 #ifdef DEBUG_SIG
 115         dump_irix5_sigctx(ctx);
 116 #endif
 117
 118         regs->regs[4] = (unsigned long) signr;
 119         regs->regs[5] = 0; /* XXX sigcode XXX */
 120         regs->regs[6] = regs->regs[29] = sp;
 121         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 122         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 123
 124         return 1;
 125
 126 segv_and_exit:
 127         force_sigsegv(signr, current);
 128         return 0;
 129 }
 130
 131 static int inline
 132 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 133                int signr, sigset_t *oldmask, siginfo_t *info)
 134 {
 135         printk("Aiee: setup_tr_frame wants to be written");
 136         do_exit(SIGSEGV);
 137 }
 138
 139 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 140         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 141 {
 142         int ret;
 143
 144         switch(regs->regs[0]) {
 145         case ERESTARTNOHAND:
 146                 regs->regs[2] = EINTR;
 147                 break;
 148         case ERESTARTSYS:
 149                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 150                         regs->regs[2] = EINTR;
 151                         break;
 152                 }
 153         /* fallthrough */
 154         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 155                 regs->cp0_epc -= 8;
 156         }
 157
 158         regs->regs[0] = 0;              /* Don't deal with this again.  */
 159
 160         if (ka->sa.sa_flags & SA_SIGINFO)
 161                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 162         else
 163                 ret = setup_irix_frame(ka, regs, sig, oldset);
 164
 165         spin_lock_irq(&current->sighand->siglock);
 166         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 167         if (!(ka->sa.sa_flags & SA_NODEFER))
 168                 sigaddset(&current->blocked,sig);
 169         recalc_sigpending();
 170         spin_unlock_irq(&current->sighand->siglock);
 171
 172         return ret;
 173 }
 174
 175 void do_irix_signal(struct pt_regs *regs)
 176 {
 177         struct k_sigaction ka;
 178         siginfo_t info;
 179         int signr;
 180         sigset_t *oldset;
 181
 182         /*
 183          * We want the common case to go fast, which is why we may in certain
 184          * cases get here from kernel mode. Just return without doing anything
 185          * if so.
 186          */
 187         if (!user_mode(regs))
 188                 return;
 189
 190         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 191                 oldset = &current->saved_sigmask;
 192         else
 193                 oldset = &current->blocked;
 194
 195         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 196         if (signr > 0) {
 197                 /* Whee!  Actually deliver the signal.  */
 198                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
 199                         /* a signal was successfully delivered; the saved
 200                          * sigmask will have been stored in the signal frame,
 201                          * and will be restored by sigreturn, so we can simply
 202                          * clear the TIF_RESTORE_SIGMASK flag */
 203                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 204                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 205                 }
 206
 207                 return;
 208         }
 209
 210         /*
 211          * Who's code doesn't conform to the restartable syscall convention
 212          * dies here!!!  The li instruction, a single machine instruction,
 213          * must directly be followed by the syscall instruction.
 214          */
 215         if (regs->regs[0]) {
 216                 if (regs->regs[2] == ERESTARTNOHAND ||
 217                     regs->regs[2] == ERESTARTSYS ||
 218                     regs->regs[2] == ERESTARTNOINTR) {
 219                         regs->cp0_epc -= 8;
 220                 }
 221                 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
 222                         regs->regs[2] = __NR_restart_syscall;
 223                         regs->regs[7] = regs->regs[26];
 224                         regs->cp0_epc -= 4;
 225                 }
 226                 regs->regs[0] = 0;      /* Don't deal with this again.  */
 227         }
 228
 229         /*
 230         * If there's no signal to deliver, we just put the saved sigmask
 231         * back
 232         */
 233         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 234                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 235                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 236         }
 237 }
 238
 239 asmlinkage void
 240 irix_sigreturn(struct pt_regs *regs)
 241 {
 242         struct sigctx_irix5 __user *context, *magic;
 243         unsigned long umask, mask;
 244         u64 *fregs;
 245         u32 usedfp;
 246         int error, sig, i, base = 0;
 247         sigset_t blocked;
 248
 249         /* Always make any pending restarted system calls return -EINTR */
 250         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 251
 252         if (regs->regs[2] == 1000)
 253                 base = 1;
 254
 255         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
 256         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
 257         sig = (int) regs->regs[base + 6];
 258 #ifdef DEBUG_SIG
 259         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 260                current->comm, current->pid, context, magic, sig);
 261 #endif
 262         if (!context)
 263                 context = magic;
 264         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 265                 goto badframe;
 266
 267 #ifdef DEBUG_SIG
 268         dump_irix5_sigctx(context);
 269 #endif
 270
 271         error = __get_user(regs->cp0_epc, &context->pc);
 272         error |= __get_user(umask, &context->rmask);
 273
 274         mask = 2;
 275         for (i = 1; i < 32; i++, mask <<= 1) {
 276                 if (umask & mask)
 277                         error |= __get_user(regs->regs[i], &context->regs[i]);
 278         }
 279         error |= __get_user(regs->hi, &context->hi);
 280         error |= __get_user(regs->lo, &context->lo);
 281
 282         error |= __get_user(usedfp, &context->usedfp);
 283         if ((umask & 1) && usedfp) {
 284                 fregs = (u64 *) &current->thread.fpu;
 285
 286                 for(i = 0; i < 32; i++)
 287                         error |= __get_user(fregs[i], &context->fpregs[i]);
 288                 error |= __get_user(current->thread.fpu.fcr31, &context->fpcsr);
 289         }
 290
 291         /* XXX do sigstack crapola here... XXX */
 292
 293         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 294
 295         if (error)
 296                 goto badframe;
 297
 298         sigdelsetmask(&blocked, ~_BLOCKABLE);
 299         spin_lock_irq(&current->sighand->siglock);
 300         current->blocked = blocked;
 301         recalc_sigpending();
 302         spin_unlock_irq(&current->sighand->siglock);
 303
 304         /*
 305          * Don't let your children do this ...
 306          */
 307         __asm__ __volatile__(
 308                 "move\t$29,%0\n\t"
 309                 "j\tsyscall_exit"
 310                 :/* no outputs */
 311                 :"r" (&regs));
 312                 /* Unreached */
 313
 314 badframe:
 315         force_sig(SIGSEGV, current);
 316 }
 317
 318 struct sigact_irix5 {
 319         int flags;
 320         void (*handler)(int);
 321         u32 sigset[4];
 322         int _unused0[2];
 323 };
 324
 325 #define SIG_SETMASK32   256     /* Goodie from SGI for BSD compatibility:
 326                                    set only the low 32 bit of the sigset.  */
 327
 328 #ifdef DEBUG_SIG
 329 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 330 {
 331         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 332                (unsigned long) p->handler,
 333                (unsigned long) p->sigset[0]);
 334 }
 335 #endif
 336
 337 asmlinkage int
 338 irix_sigaction(int sig, const struct sigaction __user *act,
 339               struct sigaction __user *oact, void __user *trampoline)
 340 {
 341         struct k_sigaction new_ka, old_ka;
 342         int ret;
 343
 344 #ifdef DEBUG_SIG
 345         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 346                (!old ? "0" : "OLD"), trampoline);
 347         if(new) {
 348                 dump_sigact_irix5(new); printk(" ");
 349         }
 350 #endif
 351         if (act) {
 352                 sigset_t mask;
 353                 int err;
 354
 355                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 356                         return -EFAULT;
 357                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 358                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 359
 360                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 361                 if (err)
 362                         return err;
 363
 364                 /*
 365                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 366                  * value for all invocations of sigaction.  Will have to
 367                  * investigate.  POSIX POSIX, die die die...
 368                  */
 369                 new_ka.sa_restorer = trampoline;
 370         }
 371
 372 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 373         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 374
 375         if (!ret && oact) {
 376                 int err;
 377
 378                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 379                         return -EFAULT;
 380
 381                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 382                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 383                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 384                                sizeof(sigset_t)) ? -EFAULT : 0;
 385                 if (err)
 386                         return -EFAULT;
 387         }
 388
 389         return ret;
 390 }
 391
 392 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 393 {
 394         return do_sigpending(set, sizeof(*set));
 395 }
 396
 397 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 398         irix_sigset_t __user *old)
 399 {
 400         sigset_t oldbits, newbits;
 401
 402         if (new) {
 403                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 404                         return -EFAULT;
 405                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 406                         return -EFAULT;
 407                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 408
 409                 spin_lock_irq(&current->sighand->siglock);
 410                 oldbits = current->blocked;
 411
 412                 switch(how) {
 413                 case 1:
 414                         sigorsets(&newbits, &oldbits, &newbits);
 415                         break;
 416
 417                 case 2:
 418                         sigandsets(&newbits, &oldbits, &newbits);
 419                         break;
 420
 421                 case 3:
 422                         break;
 423
 424                 case 256:
 425                         siginitset(&newbits, newbits.sig[0]);
 426                         break;
 427
 428                 default:
 429                         return -EINVAL;
 430                 }
 431                 recalc_sigpending();
 432                 spin_unlock_irq(&current->sighand->siglock);
 433         }
 434         if (old)
 435                 return copy_to_user(old, &current->blocked,
 436                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 437
 438         return 0;
 439 }
 440
 441 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 442 {
 443         sigset_t newset;
 444         sigset_t __user *uset;
 445
 446         uset = (sigset_t __user *) regs->regs[4];
 447         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 448                 return -EFAULT;
 449         sigdelsetmask(&newset, ~_BLOCKABLE);
 450
 451         spin_lock_irq(&current->sighand->siglock);
 452         current->saved_sigmask = current->blocked;
 453         current->blocked = newset;
 454         recalc_sigpending();
 455         spin_unlock_irq(&current->sighand->siglock);
 456
 457         current->state = TASK_INTERRUPTIBLE;
 458         schedule();
 459         set_thread_flag(TIF_RESTORE_SIGMASK);
 460         return -ERESTARTNOHAND;
 461 }
 462
 463 /* hate hate hate... */
 464 struct irix5_siginfo {
 465         int sig, code, error;
 466         union {
 467                 char unused[128 - (3 * 4)]; /* Safety net. */
 468                 struct {
 469                         int pid;
 470                         union {
 471                                 int uid;
 472                                 struct {
 473                                         int utime, status, stime;
 474                                 } child;
 475                         } procdata;
 476                 } procinfo;
 477
 478                 unsigned long fault_addr;
 479
 480                 struct {
 481                         int fd;
 482                         long band;
 483                 } fileinfo;
 484
 485                 unsigned long sigval;
 486         } stuff;
 487 };
 488
 489 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 490         struct irix5_siginfo __user *info, struct timespec __user *tp)
 491 {
 492         long expire = MAX_SCHEDULE_TIMEOUT;
 493         sigset_t kset;
 494         int i, sig, error, timeo = 0;
 495         struct timespec ktp;
 496
 497 #ifdef DEBUG_SIG
 498         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 499                current->comm, current->pid, set, info, tp);
 500 #endif
 501
 502         /* Must always specify the signal set. */
 503         if (!set)
 504                 return -EINVAL;
 505
 506         if (copy_from_user(&kset, set, sizeof(set)))
 507                 return -EFAULT;
 508
 509         if (info && clear_user(info, sizeof(*info))) {
 510                 error = -EFAULT;
 511                 goto out;
 512         }
 513
 514         if (tp) {
 515                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 516                         return -EFAULT;
 517
 518                 if (!ktp.tv_sec && !ktp.tv_nsec)
 519                         return -EINVAL;
 520
 521                 expire = timespec_to_jiffies(&ktp) +
 522                          (ktp.tv_sec || ktp.tv_nsec);
 523         }
 524
 525         while(1) {
 526                 long tmp = 0;
 527
 528                 expire = schedule_timeout_interruptible(expire);
 529
 530                 for (i=0; i<=4; i++)
 531                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 532
 533                 if (tmp)
 534                         break;
 535                 if (!expire) {
 536                         timeo = 1;
 537                         break;
 538                 }
 539                 if (signal_pending(current))
 540                         return -EINTR;
 541         }
 542         if (timeo)
 543                 return -EAGAIN;
 544
 545         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 546                 if (sigismember (&kset, sig))
 547                         continue;
 548                 if (sigismember (&current->pending.signal, sig)) {
 549                         /* XXX need more than this... */
 550                         if (info)
 551                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 552                         return 0;
 553                 }
 554         }
 555
 556         /* Should not get here, but do something sane if we do. */
 557         error = -EINTR;
 558
 559 out:
 560         return error;
 561 }
 562
 563 /* This is here because of irix5_siginfo definition. */
 564 #define IRIX_P_PID    0
 565 #define IRIX_P_PGID   2
 566 #define IRIX_P_ALL    7
 567
 568 #define W_EXITED     1
 569 #define W_TRAPPED    2
 570 #define W_STOPPED    4
 571 #define W_CONT       8
 572 #define W_NOHANG    64
 573
 574 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 575
 576 asmlinkage int irix_waitsys(int type, int pid,
 577         struct irix5_siginfo __user *info, int options,
 578         struct rusage __user *ru)
 579 {
 580         int flag, retval;
 581         DECLARE_WAITQUEUE(wait, current);
 582         struct task_struct *tsk;
 583         struct task_struct *p;
 584         struct list_head *_p;
 585
 586         if (!info)
 587                 return -EINVAL;
 588
 589         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 590                 return -EFAULT;
 591
 592         if (ru)
 593                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 594                         return -EFAULT;
 595
 596         if (options & ~W_MASK)
 597                 return -EINVAL;
 598
 599         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 600                 return -EINVAL;
 601
 602         add_wait_queue(&current->signal->wait_chldexit, &wait);
 603 repeat:
 604         flag = 0;
 605         current->state = TASK_INTERRUPTIBLE;
 606         read_lock(&tasklist_lock);
 607         tsk = current;
 608         list_for_each(_p,&tsk->children) {
 609                 p = list_entry(_p,struct task_struct,sibling);
 610                 if ((type == IRIX_P_PID) && p->pid != pid)
 611                         continue;
 612                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 613                         continue;
 614                 if ((p->exit_signal != SIGCHLD))
 615                         continue;
 616                 flag = 1;
 617                 switch (p->state) {
 618                 case TASK_STOPPED:
 619                         if (!p->exit_code)
 620                                 continue;
 621                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 622                             !(p->ptrace & PT_PTRACED))
 623                                 continue;
 624                         read_unlock(&tasklist_lock);
 625
 626                         /* move to end of parent's list to avoid starvation */
 627                         write_lock_irq(&tasklist_lock);
 628                         remove_parent(p);
 629                         add_parent(p);
 630                         write_unlock_irq(&tasklist_lock);
 631                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 632                         if (retval)
 633                                 goto end_waitsys;
 634
 635                         retval = __put_user(SIGCHLD, &info->sig);
 636                         retval |= __put_user(0, &info->code);
 637                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 638                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 639                                    &info->stuff.procinfo.procdata.child.status);
 640                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 641                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 642                         if (retval)
 643                                 goto end_waitsys;
 644
 645                         p->exit_code = 0;
 646                         goto end_waitsys;
 647
 648                 case EXIT_ZOMBIE:
 649                         current->signal->cutime += p->utime + p->signal->cutime;
 650                         current->signal->cstime += p->stime + p->signal->cstime;
 651                         if (ru != NULL)
 652                                 getrusage(p, RUSAGE_BOTH, ru);
 653                         retval = __put_user(SIGCHLD, &info->sig);
 654                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 655                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 656                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 657                                    &info->stuff.procinfo.procdata.child.status);
 658                         retval |= __put_user(p->utime,
 659                                    &info->stuff.procinfo.procdata.child.utime);
 660                         retval |= __put_user(p->stime,
 661                                    &info->stuff.procinfo.procdata.child.stime);
 662                         if (retval)
 663                                 return retval;
 664
 665                         if (p->real_parent != p->parent) {
 666                                 write_lock_irq(&tasklist_lock);
 667                                 remove_parent(p);
 668                                 p->parent = p->real_parent;
 669                                 add_parent(p);
 670                                 do_notify_parent(p, SIGCHLD);
 671                                 write_unlock_irq(&tasklist_lock);
 672                         } else
 673                                 release_task(p);
 674                         goto end_waitsys;
 675                 default:
 676                         continue;
 677                 }
 678                 tsk = next_thread(tsk);
 679         }
 680         read_unlock(&tasklist_lock);
 681         if (flag) {
 682                 retval = 0;
 683                 if (options & W_NOHANG)
 684                         goto end_waitsys;
 685                 retval = -ERESTARTSYS;
 686                 if (signal_pending(current))
 687                         goto end_waitsys;
 688                 current->state = TASK_INTERRUPTIBLE;
 689                 schedule();
 690                 goto repeat;
 691         }
 692         retval = -ECHILD;
 693 end_waitsys:
 694         current->state = TASK_RUNNING;
 695         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 696
 697         return retval;
 698 }
 699
 700 struct irix5_context {
 701         u32 flags;
 702         u32 link;
 703         u32 sigmask[4];
 704         struct { u32 sp, size, flags; } stack;
 705         int regs[36];
 706         u32 fpregs[32];
 707         u32 fpcsr;
 708         u32 _unused0;
 709         u32 _unused1[47];
 710         u32 weird_graphics_thing;
 711 };
 712
 713 asmlinkage int irix_getcontext(struct pt_regs *regs)
 714 {
 715         int error, i, base = 0;
 716         struct irix5_context __user *ctx;
 717         unsigned long flags;
 718
 719         if (regs->regs[2] == 1000)
 720                 base = 1;
 721         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 722
 723 #ifdef DEBUG_SIG
 724         printk("[%s:%d] irix_getcontext(%p)\n",
 725                current->comm, current->pid, ctx);
 726 #endif
 727
 728         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 729                 return -EFAULT;
 730
 731         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 732
 733         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 734
 735         /* XXX Do sigstack stuff someday... */
 736         error |= __put_user(0, &ctx->stack.sp);
 737         error |= __put_user(0, &ctx->stack.size);
 738         error |= __put_user(0, &ctx->stack.flags);
 739
 740         error |= __put_user(0, &ctx->weird_graphics_thing);
 741         error |= __put_user(0, &ctx->regs[0]);
 742         for (i = 1; i < 32; i++)
 743                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 744         error |= __put_user(regs->lo, &ctx->regs[32]);
 745         error |= __put_user(regs->hi, &ctx->regs[33]);
 746         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 747         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 748
 749         flags = 0x0f;
 750         if (!used_math()) {
 751                 flags &= ~(0x08);
 752         } else {
 753                 /* XXX wheee... */
 754                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 755         }
 756         error |= __put_user(flags, &ctx->flags);
 757
 758         return error;
 759 }
 760
 761 asmlinkage void irix_setcontext(struct pt_regs *regs)
 762 {
 763         struct irix5_context __user *ctx;
 764         int err, base = 0;
 765         u32 flags;
 766
 767         if (regs->regs[2] == 1000)
 768                 base = 1;
 769         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 770
 771 #ifdef DEBUG_SIG
 772         printk("[%s:%d] irix_setcontext(%p)\n",
 773                current->comm, current->pid, ctx);
 774 #endif
 775
 776         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 777                 goto segv_and_exit;
 778
 779         err = __get_user(flags, &ctx->flags);
 780         if (flags & 0x02) {
 781                 /* XXX sigstack garbage, todo... */
 782                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 783         }
 784
 785         if (flags & 0x04) {
 786                 int i;
 787
 788                 /* XXX extra control block stuff... todo... */
 789                 for (i = 1; i < 32; i++)
 790                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 791                 err |= __get_user(regs->lo, &ctx->regs[32]);
 792                 err |= __get_user(regs->hi, &ctx->regs[33]);
 793                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 794         }
 795
 796         if (flags & 0x08)
 797                 /* XXX fpu context, blah... */
 798                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 799
 800         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 801         if (err)
 802                 goto segv_and_exit;
 803
 804         /*
 805          * Don't let your children do this ...
 806          */
 807         __asm__ __volatile__(
 808                 "move\t$29,%0\n\t"
 809                 "j\tsyscall_exit"
 810                 :/* no outputs */
 811                 :"r" (&regs));
 812                 /* Unreached */
 813
 814 segv_and_exit:
 815         force_sigsegv(SIGSEGV, current);
 816 }
 817
 818 struct irix_sigstack {
 819         unsigned long sp;
 820         int status;
 821 };
 822
 823 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 824         struct irix_sigstack __user *old)
 825 {
 826 #ifdef DEBUG_SIG
 827         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 828                current->comm, current->pid, new, old);
 829 #endif
 830         if (new) {
 831                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 832                         return -EFAULT;
 833         }
 834
 835         if (old) {
 836                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 837                         return -EFAULT;
 838         }
 839
 840         return 0;
 841 }
 842
 843 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 844
 845 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 846                                 struct irix_sigaltstack __user *old)
 847 {
 848 #ifdef DEBUG_SIG
 849         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 850                current->comm, current->pid, new, old);
 851 #endif
 852         if (new)
 853                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 854                         return -EFAULT;
 855
 856         if (old) {
 857                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 858                         return -EFAULT;
 859         }
 860
 861         return 0;
 862 }
 863
 864 struct irix_procset {
 865         int cmd, ltype, lid, rtype, rid;
 866 };
 867
 868 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 869 {
 870         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 871                 return -EFAULT;
 872 #ifdef DEBUG_SIG
 873         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 874                current->comm, current->pid,
 875                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 876                sig);
 877 #endif
 878         return -EINVAL;
 879 }