git.oblomov.eu Git - linux-2.6/blob - 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 #define _IRIX_NSIG              128
  28 #define _IRIX_NSIG_BPW          BITS_PER_LONG
  29 #define _IRIX_NSIG_WORDS        (_IRIX_NSIG / _IRIX_NSIG_BPW)
  30
  31 typedef struct {
  32         unsigned long sig[_IRIX_NSIG_WORDS];
  33 } irix_sigset_t;
  34
  35 struct sigctx_irix5 {
  36         u32 rmask, cp0_status;
  37         u64 pc;
  38         u64 regs[32];
  39         u64 fpregs[32];
  40         u32 usedfp, fpcsr, fpeir, sstk_flags;
  41         u64 hi, lo;
  42         u64 cp0_cause, cp0_badvaddr, _unused0;
  43         irix_sigset_t sigset;
  44         u64 weird_fpu_thing;
  45         u64 _unused1[31];
  46 };
  47
  48 #ifdef DEBUG_SIG
  49 /* Debugging */
  50 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  51 {
  52         int i;
  53
  54         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  55                (unsigned long) c->rmask,
  56                (unsigned long) c->cp0_status,
  57                (unsigned long) c->pc);
  58         printk("regs: ");
  59         for(i = 0; i < 16; i++)
  60                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  61         printk("\nregs: ");
  62         for(i = 16; i < 32; i++)
  63                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  64         printk("\nfpregs: ");
  65         for(i = 0; i < 16; i++)
  66                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  67         printk("\nfpregs: ");
  68         for(i = 16; i < 32; i++)
  69                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  70         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  71                (int) c->usedfp, (unsigned long) c->fpcsr,
  72                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  73         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  74                (unsigned long) c->hi, (unsigned long) c->lo,
  75                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  76         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  77                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  78                (unsigned long) c->sigset.sig[1],
  79                (unsigned long) c->sigset.sig[2],
  80                (unsigned long) c->sigset.sig[3]);
  81 }
  82 #endif
  83
  84 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  85                             int signr, sigset_t *oldmask)
  86 {
  87         struct sigctx_irix5 __user *ctx;
  88         unsigned long sp;
  89         int error, i;
  90
  91         sp = regs->regs[29];
  92         sp -= sizeof(struct sigctx_irix5);
  93         sp &= ~(0xf);
  94         ctx = (struct sigctx_irix5 __user *) sp;
  95         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  96                 goto segv_and_exit;
  97
  98         error = __put_user(0, &ctx->weird_fpu_thing);
  99         error |= __put_user(~(0x00000001), &ctx->rmask);
 100         error |= __put_user(0, &ctx->regs[0]);
 101         for(i = 1; i < 32; i++)
 102                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
 103
 104         error |= __put_user((u64) regs->hi, &ctx->hi);
 105         error |= __put_user((u64) regs->lo, &ctx->lo);
 106         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 107         error |= __put_user(!!used_math(), &ctx->usedfp);
 108         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 109         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 110
 111         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 112
 113         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 114
 115         if (error)
 116                 goto segv_and_exit;
 117
 118 #ifdef DEBUG_SIG
 119         dump_irix5_sigctx(ctx);
 120 #endif
 121
 122         regs->regs[4] = (unsigned long) signr;
 123         regs->regs[5] = 0; /* XXX sigcode XXX */
 124         regs->regs[6] = regs->regs[29] = sp;
 125         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 126         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 127
 128         return 1;
 129
 130 segv_and_exit:
 131         force_sigsegv(signr, current);
 132         return 0;
 133 }
 134
 135 static int inline
 136 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 137                int signr, sigset_t *oldmask, siginfo_t *info)
 138 {
 139         printk("Aiee: setup_tr_frame wants to be written");
 140         do_exit(SIGSEGV);
 141 }
 142
 143 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 144         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 145 {
 146         int ret;
 147
 148         switch(regs->regs[0]) {
 149         case ERESTARTNOHAND:
 150                 regs->regs[2] = EINTR;
 151                 break;
 152         case ERESTARTSYS:
 153                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 154                         regs->regs[2] = EINTR;
 155                         break;
 156                 }
 157         /* fallthrough */
 158         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 159                 regs->cp0_epc -= 8;
 160         }
 161
 162         regs->regs[0] = 0;              /* Don't deal with this again.  */
 163
 164         if (ka->sa.sa_flags & SA_SIGINFO)
 165                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 166         else
 167                 ret = setup_irix_frame(ka, regs, sig, oldset);
 168
 169         spin_lock_irq(&current->sighand->siglock);
 170         sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
 171         if (!(ka->sa.sa_flags & SA_NODEFER))
 172                 sigaddset(&current->blocked, sig);
 173         recalc_sigpending();
 174         spin_unlock_irq(&current->sighand->siglock);
 175
 176         return ret;
 177 }
 178
 179 void do_irix_signal(struct pt_regs *regs)
 180 {
 181         struct k_sigaction ka;
 182         siginfo_t info;
 183         int signr;
 184         sigset_t *oldset;
 185
 186         /*
 187          * We want the common case to go fast, which is why we may in certain
 188          * cases get here from kernel mode. Just return without doing anything
 189          * if so.
 190          */
 191         if (!user_mode(regs))
 192                 return;
 193
 194         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 195                 oldset = &current->saved_sigmask;
 196         else
 197                 oldset = &current->blocked;
 198
 199         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 200         if (signr > 0) {
 201                 /* Whee!  Actually deliver the signal.  */
 202                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
 203                         /* a signal was successfully delivered; the saved
 204                          * sigmask will have been stored in the signal frame,
 205                          * and will be restored by sigreturn, so we can simply
 206                          * clear the TIF_RESTORE_SIGMASK flag */
 207                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 208                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 209                 }
 210
 211                 return;
 212         }
 213
 214         /*
 215          * Who's code doesn't conform to the restartable syscall convention
 216          * dies here!!!  The li instruction, a single machine instruction,
 217          * must directly be followed by the syscall instruction.
 218          */
 219         if (regs->regs[0]) {
 220                 if (regs->regs[2] == ERESTARTNOHAND ||
 221                     regs->regs[2] == ERESTARTSYS ||
 222                     regs->regs[2] == ERESTARTNOINTR) {
 223                         regs->cp0_epc -= 8;
 224                 }
 225                 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
 226                         regs->regs[2] = __NR_restart_syscall;
 227                         regs->regs[7] = regs->regs[26];
 228                         regs->cp0_epc -= 4;
 229                 }
 230                 regs->regs[0] = 0;      /* Don't deal with this again.  */
 231         }
 232
 233         /*
 234         * If there's no signal to deliver, we just put the saved sigmask
 235         * back
 236         */
 237         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 238                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 239                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 240         }
 241 }
 242
 243 asmlinkage void
 244 irix_sigreturn(struct pt_regs *regs)
 245 {
 246         struct sigctx_irix5 __user *context, *magic;
 247         unsigned long umask, mask;
 248         u64 *fregs;
 249         u32 usedfp;
 250         int error, sig, i, base = 0;
 251         sigset_t blocked;
 252
 253         /* Always make any pending restarted system calls return -EINTR */
 254         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 255
 256         if (regs->regs[2] == 1000)
 257                 base = 1;
 258
 259         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
 260         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
 261         sig = (int) regs->regs[base + 6];
 262 #ifdef DEBUG_SIG
 263         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 264                current->comm, current->pid, context, magic, sig);
 265 #endif
 266         if (!context)
 267                 context = magic;
 268         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 269                 goto badframe;
 270
 271 #ifdef DEBUG_SIG
 272         dump_irix5_sigctx(context);
 273 #endif
 274
 275         error = __get_user(regs->cp0_epc, &context->pc);
 276         error |= __get_user(umask, &context->rmask);
 277
 278         mask = 2;
 279         for (i = 1; i < 32; i++, mask <<= 1) {
 280                 if (umask & mask)
 281                         error |= __get_user(regs->regs[i], &context->regs[i]);
 282         }
 283         error |= __get_user(regs->hi, &context->hi);
 284         error |= __get_user(regs->lo, &context->lo);
 285
 286         error |= __get_user(usedfp, &context->usedfp);
 287         if ((umask & 1) && usedfp) {
 288                 fregs = (u64 *) &current->thread.fpu;
 289
 290                 for(i = 0; i < 32; i++)
 291                         error |= __get_user(fregs[i], &context->fpregs[i]);
 292                 error |= __get_user(current->thread.fpu.fcr31, &context->fpcsr);
 293         }
 294
 295         /* XXX do sigstack crapola here... XXX */
 296
 297         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 298
 299         if (error)
 300                 goto badframe;
 301
 302         sigdelsetmask(&blocked, ~_BLOCKABLE);
 303         spin_lock_irq(&current->sighand->siglock);
 304         current->blocked = blocked;
 305         recalc_sigpending();
 306         spin_unlock_irq(&current->sighand->siglock);
 307
 308         /*
 309          * Don't let your children do this ...
 310          */
 311         __asm__ __volatile__(
 312                 "move\t$29,%0\n\t"
 313                 "j\tsyscall_exit"
 314                 :/* no outputs */
 315                 :"r" (&regs));
 316                 /* Unreached */
 317
 318 badframe:
 319         force_sig(SIGSEGV, current);
 320 }
 321
 322 struct sigact_irix5 {
 323         int flags;
 324         void (*handler)(int);
 325         u32 sigset[4];
 326         int _unused0[2];
 327 };
 328
 329 #define SIG_SETMASK32   256     /* Goodie from SGI for BSD compatibility:
 330                                    set only the low 32 bit of the sigset.  */
 331
 332 #ifdef DEBUG_SIG
 333 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 334 {
 335         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 336                (unsigned long) p->handler,
 337                (unsigned long) p->sigset[0]);
 338 }
 339 #endif
 340
 341 asmlinkage int
 342 irix_sigaction(int sig, const struct sigaction __user *act,
 343               struct sigaction __user *oact, void __user *trampoline)
 344 {
 345         struct k_sigaction new_ka, old_ka;
 346         int ret;
 347
 348 #ifdef DEBUG_SIG
 349         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 350                (!old ? "0" : "OLD"), trampoline);
 351         if(new) {
 352                 dump_sigact_irix5(new); printk(" ");
 353         }
 354 #endif
 355         if (act) {
 356                 sigset_t mask;
 357                 int err;
 358
 359                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 360                         return -EFAULT;
 361                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 362                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 363
 364                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 365                 if (err)
 366                         return err;
 367
 368                 /*
 369                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 370                  * value for all invocations of sigaction.  Will have to
 371                  * investigate.  POSIX POSIX, die die die...
 372                  */
 373                 new_ka.sa_restorer = trampoline;
 374         }
 375
 376 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 377         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 378
 379         if (!ret && oact) {
 380                 int err;
 381
 382                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 383                         return -EFAULT;
 384
 385                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 386                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 387                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 388                                sizeof(sigset_t)) ? -EFAULT : 0;
 389                 if (err)
 390                         return -EFAULT;
 391         }
 392
 393         return ret;
 394 }
 395
 396 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 397 {
 398         return do_sigpending(set, sizeof(*set));
 399 }
 400
 401 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 402         irix_sigset_t __user *old)
 403 {
 404         sigset_t oldbits, newbits;
 405
 406         if (new) {
 407                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 408                         return -EFAULT;
 409                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 410                         return -EFAULT;
 411                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 412
 413                 spin_lock_irq(&current->sighand->siglock);
 414                 oldbits = current->blocked;
 415
 416                 switch(how) {
 417                 case 1:
 418                         sigorsets(&newbits, &oldbits, &newbits);
 419                         break;
 420
 421                 case 2:
 422                         sigandsets(&newbits, &oldbits, &newbits);
 423                         break;
 424
 425                 case 3:
 426                         break;
 427
 428                 case 256:
 429                         siginitset(&newbits, newbits.sig[0]);
 430                         break;
 431
 432                 default:
 433                         spin_unlock_irq(&current->sighand->siglock);
 434                         return -EINVAL;
 435                 }
 436                 recalc_sigpending();
 437                 spin_unlock_irq(&current->sighand->siglock);
 438         }
 439         if (old)
 440                 return copy_to_user(old, &current->blocked,
 441                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 442
 443         return 0;
 444 }
 445
 446 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 447 {
 448         sigset_t newset;
 449         sigset_t __user *uset;
 450
 451         uset = (sigset_t __user *) regs->regs[4];
 452         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 453                 return -EFAULT;
 454         sigdelsetmask(&newset, ~_BLOCKABLE);
 455
 456         spin_lock_irq(&current->sighand->siglock);
 457         current->saved_sigmask = current->blocked;
 458         current->blocked = newset;
 459         recalc_sigpending();
 460         spin_unlock_irq(&current->sighand->siglock);
 461
 462         current->state = TASK_INTERRUPTIBLE;
 463         schedule();
 464         set_thread_flag(TIF_RESTORE_SIGMASK);
 465         return -ERESTARTNOHAND;
 466 }
 467
 468 /* hate hate hate... */
 469 struct irix5_siginfo {
 470         int sig, code, error;
 471         union {
 472                 char unused[128 - (3 * 4)]; /* Safety net. */
 473                 struct {
 474                         int pid;
 475                         union {
 476                                 int uid;
 477                                 struct {
 478                                         int utime, status, stime;
 479                                 } child;
 480                         } procdata;
 481                 } procinfo;
 482
 483                 unsigned long fault_addr;
 484
 485                 struct {
 486                         int fd;
 487                         long band;
 488                 } fileinfo;
 489
 490                 unsigned long sigval;
 491         } stuff;
 492 };
 493
 494 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 495         struct irix5_siginfo __user *info, struct timespec __user *tp)
 496 {
 497         long expire = MAX_SCHEDULE_TIMEOUT;
 498         sigset_t kset;
 499         int i, sig, error, timeo = 0;
 500         struct timespec ktp;
 501
 502 #ifdef DEBUG_SIG
 503         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 504                current->comm, current->pid, set, info, tp);
 505 #endif
 506
 507         /* Must always specify the signal set. */
 508         if (!set)
 509                 return -EINVAL;
 510
 511         if (copy_from_user(&kset, set, sizeof(set)))
 512                 return -EFAULT;
 513
 514         if (info && clear_user(info, sizeof(*info))) {
 515                 error = -EFAULT;
 516                 goto out;
 517         }
 518
 519         if (tp) {
 520                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 521                         return -EFAULT;
 522
 523                 if (!ktp.tv_sec && !ktp.tv_nsec)
 524                         return -EINVAL;
 525
 526                 expire = timespec_to_jiffies(&ktp) +
 527                          (ktp.tv_sec || ktp.tv_nsec);
 528         }
 529
 530         while(1) {
 531                 long tmp = 0;
 532
 533                 expire = schedule_timeout_interruptible(expire);
 534
 535                 for (i=0; i < _IRIX_NSIG_WORDS; i++)
 536                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 537
 538                 if (tmp)
 539                         break;
 540                 if (!expire) {
 541                         timeo = 1;
 542                         break;
 543                 }
 544                 if (signal_pending(current))
 545                         return -EINTR;
 546         }
 547         if (timeo)
 548                 return -EAGAIN;
 549
 550         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 551                 if (sigismember (&kset, sig))
 552                         continue;
 553                 if (sigismember (&current->pending.signal, sig)) {
 554                         /* XXX need more than this... */
 555                         if (info)
 556                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 557                         return 0;
 558                 }
 559         }
 560
 561         /* Should not get here, but do something sane if we do. */
 562         error = -EINTR;
 563
 564 out:
 565         return error;
 566 }
 567
 568 /* This is here because of irix5_siginfo definition. */
 569 #define IRIX_P_PID    0
 570 #define IRIX_P_PGID   2
 571 #define IRIX_P_ALL    7
 572
 573 #define W_EXITED     1
 574 #define W_TRAPPED    2
 575 #define W_STOPPED    4
 576 #define W_CONT       8
 577 #define W_NOHANG    64
 578
 579 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 580
 581 asmlinkage int irix_waitsys(int type, int upid,
 582         struct irix5_siginfo __user *info, int options,
 583         struct rusage __user *ru)
 584 {
 585         struct pid *pid = NULL;
 586         int flag, retval;
 587         DECLARE_WAITQUEUE(wait, current);
 588         struct task_struct *tsk;
 589         struct task_struct *p;
 590         struct list_head *_p;
 591
 592         if (!info)
 593                 return -EINVAL;
 594
 595         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 596                 return -EFAULT;
 597
 598         if (ru)
 599                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 600                         return -EFAULT;
 601
 602         if (options & ~W_MASK)
 603                 return -EINVAL;
 604
 605         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 606                 return -EINVAL;
 607
 608         if (type != IRIX_P_ALL)
 609                 pid = find_get_pid(upid);
 610         add_wait_queue(&current->signal->wait_chldexit, &wait);
 611 repeat:
 612         flag = 0;
 613         current->state = TASK_INTERRUPTIBLE;
 614         read_lock(&tasklist_lock);
 615         tsk = current;
 616         list_for_each(_p, &tsk->children) {
 617                 p = list_entry(_p, struct task_struct, sibling);
 618                 if ((type == IRIX_P_PID) && task_pid(p) != pid)
 619                         continue;
 620                 if ((type == IRIX_P_PGID) && task_pgrp(p) != pid)
 621                         continue;
 622                 if ((p->exit_signal != SIGCHLD))
 623                         continue;
 624                 flag = 1;
 625                 switch (p->state) {
 626                 case TASK_STOPPED:
 627                         if (!p->exit_code)
 628                                 continue;
 629                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 630                             !(p->ptrace & PT_PTRACED))
 631                                 continue;
 632                         read_unlock(&tasklist_lock);
 633
 634                         /* move to end of parent's list to avoid starvation */
 635                         write_lock_irq(&tasklist_lock);
 636                         remove_parent(p);
 637                         add_parent(p);
 638                         write_unlock_irq(&tasklist_lock);
 639                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 640                         if (retval)
 641                                 goto end_waitsys;
 642
 643                         retval = __put_user(SIGCHLD, &info->sig);
 644                         retval |= __put_user(0, &info->code);
 645                         retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
 646                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 647                                    &info->stuff.procinfo.procdata.child.status);
 648                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 649                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 650                         if (retval)
 651                                 goto end_waitsys;
 652
 653                         p->exit_code = 0;
 654                         goto end_waitsys;
 655
 656                 case EXIT_ZOMBIE:
 657                         current->signal->cutime += p->utime + p->signal->cutime;
 658                         current->signal->cstime += p->stime + p->signal->cstime;
 659                         if (ru != NULL)
 660                                 getrusage(p, RUSAGE_BOTH, ru);
 661                         retval = __put_user(SIGCHLD, &info->sig);
 662                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 663                         retval |= __put_user(task_pid_vnr(p), &info->stuff.procinfo.pid);
 664                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 665                                    &info->stuff.procinfo.procdata.child.status);
 666                         retval |= __put_user(p->utime,
 667                                    &info->stuff.procinfo.procdata.child.utime);
 668                         retval |= __put_user(p->stime,
 669                                    &info->stuff.procinfo.procdata.child.stime);
 670                         if (retval)
 671                                 goto end_waitsys;
 672
 673                         if (p->real_parent != p->parent) {
 674                                 write_lock_irq(&tasklist_lock);
 675                                 remove_parent(p);
 676                                 p->parent = p->real_parent;
 677                                 add_parent(p);
 678                                 do_notify_parent(p, SIGCHLD);
 679                                 write_unlock_irq(&tasklist_lock);
 680                         } else
 681                                 release_task(p);
 682                         goto end_waitsys;
 683                 default:
 684                         continue;
 685                 }
 686                 tsk = next_thread(tsk);
 687         }
 688         read_unlock(&tasklist_lock);
 689         if (flag) {
 690                 retval = 0;
 691                 if (options & W_NOHANG)
 692                         goto end_waitsys;
 693                 retval = -ERESTARTSYS;
 694                 if (signal_pending(current))
 695                         goto end_waitsys;
 696                 current->state = TASK_INTERRUPTIBLE;
 697                 schedule();
 698                 goto repeat;
 699         }
 700         retval = -ECHILD;
 701 end_waitsys:
 702         current->state = TASK_RUNNING;
 703         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 704         put_pid(pid);
 705
 706         return retval;
 707 }
 708
 709 struct irix5_context {
 710         u32 flags;
 711         u32 link;
 712         u32 sigmask[4];
 713         struct { u32 sp, size, flags; } stack;
 714         int regs[36];
 715         u32 fpregs[32];
 716         u32 fpcsr;
 717         u32 _unused0;
 718         u32 _unused1[47];
 719         u32 weird_graphics_thing;
 720 };
 721
 722 asmlinkage int irix_getcontext(struct pt_regs *regs)
 723 {
 724         int error, i, base = 0;
 725         struct irix5_context __user *ctx;
 726         unsigned long flags;
 727
 728         if (regs->regs[2] == 1000)
 729                 base = 1;
 730         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 731
 732 #ifdef DEBUG_SIG
 733         printk("[%s:%d] irix_getcontext(%p)\n",
 734                current->comm, current->pid, ctx);
 735 #endif
 736
 737         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
 738                 return -EFAULT;
 739
 740         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 741
 742         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 743
 744         /* XXX Do sigstack stuff someday... */
 745         error |= __put_user(0, &ctx->stack.sp);
 746         error |= __put_user(0, &ctx->stack.size);
 747         error |= __put_user(0, &ctx->stack.flags);
 748
 749         error |= __put_user(0, &ctx->weird_graphics_thing);
 750         error |= __put_user(0, &ctx->regs[0]);
 751         for (i = 1; i < 32; i++)
 752                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 753         error |= __put_user(regs->lo, &ctx->regs[32]);
 754         error |= __put_user(regs->hi, &ctx->regs[33]);
 755         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 756         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 757
 758         flags = 0x0f;
 759         if (!used_math()) {
 760                 flags &= ~(0x08);
 761         } else {
 762                 /* XXX wheee... */
 763                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 764         }
 765         error |= __put_user(flags, &ctx->flags);
 766
 767         return error;
 768 }
 769
 770 asmlinkage void irix_setcontext(struct pt_regs *regs)
 771 {
 772         struct irix5_context __user *ctx;
 773         int err, base = 0;
 774         u32 flags;
 775
 776         if (regs->regs[2] == 1000)
 777                 base = 1;
 778         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 779
 780 #ifdef DEBUG_SIG
 781         printk("[%s:%d] irix_setcontext(%p)\n",
 782                current->comm, current->pid, ctx);
 783 #endif
 784
 785         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 786                 goto segv_and_exit;
 787
 788         err = __get_user(flags, &ctx->flags);
 789         if (flags & 0x02) {
 790                 /* XXX sigstack garbage, todo... */
 791                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 792         }
 793
 794         if (flags & 0x04) {
 795                 int i;
 796
 797                 /* XXX extra control block stuff... todo... */
 798                 for (i = 1; i < 32; i++)
 799                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 800                 err |= __get_user(regs->lo, &ctx->regs[32]);
 801                 err |= __get_user(regs->hi, &ctx->regs[33]);
 802                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 803         }
 804
 805         if (flags & 0x08)
 806                 /* XXX fpu context, blah... */
 807                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 808
 809         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 810         if (err)
 811                 goto segv_and_exit;
 812
 813         /*
 814          * Don't let your children do this ...
 815          */
 816         __asm__ __volatile__(
 817                 "move\t$29,%0\n\t"
 818                 "j\tsyscall_exit"
 819                 :/* no outputs */
 820                 :"r" (&regs));
 821                 /* Unreached */
 822
 823 segv_and_exit:
 824         force_sigsegv(SIGSEGV, current);
 825 }
 826
 827 struct irix_sigstack {
 828         unsigned long sp;
 829         int status;
 830 };
 831
 832 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 833         struct irix_sigstack __user *old)
 834 {
 835 #ifdef DEBUG_SIG
 836         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 837                current->comm, current->pid, new, old);
 838 #endif
 839         if (new) {
 840                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 841                         return -EFAULT;
 842         }
 843
 844         if (old) {
 845                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 846                         return -EFAULT;
 847         }
 848
 849         return 0;
 850 }
 851
 852 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 853
 854 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 855                                 struct irix_sigaltstack __user *old)
 856 {
 857 #ifdef DEBUG_SIG
 858         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 859                current->comm, current->pid, new, old);
 860 #endif
 861         if (new)
 862                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 863                         return -EFAULT;
 864
 865         if (old) {
 866                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 867                         return -EFAULT;
 868         }
 869
 870         return 0;
 871 }
 872
 873 struct irix_procset {
 874         int cmd, ltype, lid, rtype, rid;
 875 };
 876
 877 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 878 {
 879         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 880                 return -EFAULT;
 881 #ifdef DEBUG_SIG
 882         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 883                current->comm, current->pid,
 884                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 885                sig);
 886 #endif
 887         return -EINVAL;
 888 }