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/smp_lock.h>
  14 #include <linux/time.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/resource.h>
  17
  18 #include <asm/ptrace.h>
  19 #include <asm/uaccess.h>
  20 #include <asm/unistd.h>
  21
  22 #undef DEBUG_SIG
  23
  24 #define _S(nr) (1<<((nr)-1))
  25
  26 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  27
  28 typedef struct {
  29         unsigned long sig[4];
  30 } irix_sigset_t;
  31
  32 struct sigctx_irix5 {
  33         u32 rmask, cp0_status;
  34         u64 pc;
  35         u64 regs[32];
  36         u64 fpregs[32];
  37         u32 usedfp, fpcsr, fpeir, sstk_flags;
  38         u64 hi, lo;
  39         u64 cp0_cause, cp0_badvaddr, _unused0;
  40         irix_sigset_t sigset;
  41         u64 weird_fpu_thing;
  42         u64 _unused1[31];
  43 };
  44
  45 #ifdef DEBUG_SIG
  46 /* Debugging */
  47 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  48 {
  49         int i;
  50
  51         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  52                (unsigned long) c->rmask,
  53                (unsigned long) c->cp0_status,
  54                (unsigned long) c->pc);
  55         printk("regs: ");
  56         for(i = 0; i < 16; i++)
  57                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  58         printk("\nregs: ");
  59         for(i = 16; i < 32; i++)
  60                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  61         printk("\nfpregs: ");
  62         for(i = 0; i < 16; i++)
  63                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  64         printk("\nfpregs: ");
  65         for(i = 16; i < 32; i++)
  66                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  67         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  68                (int) c->usedfp, (unsigned long) c->fpcsr,
  69                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  70         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  71                (unsigned long) c->hi, (unsigned long) c->lo,
  72                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  73         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  74                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  75                (unsigned long) c->sigset.sig[1],
  76                (unsigned long) c->sigset.sig[2],
  77                (unsigned long) c->sigset.sig[3]);
  78 }
  79 #endif
  80
  81 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  82                             int signr, sigset_t *oldmask)
  83 {
  84         struct sigctx_irix5 __user *ctx;
  85         unsigned long sp;
  86         int error, i;
  87
  88         sp = regs->regs[29];
  89         sp -= sizeof(struct sigctx_irix5);
  90         sp &= ~(0xf);
  91         ctx = (struct sigctx_irix5 __user *) sp;
  92         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  93                 goto segv_and_exit;
  94
  95         error = __put_user(0, &ctx->weird_fpu_thing);
  96         error |= __put_user(~(0x00000001), &ctx->rmask);
  97         error |= __put_user(0, &ctx->regs[0]);
  98         for(i = 1; i < 32; i++)
  99                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
 100
 101         error |= __put_user((u64) regs->hi, &ctx->hi);
 102         error |= __put_user((u64) regs->lo, &ctx->lo);
 103         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 104         error |= __put_user(!!used_math(), &ctx->usedfp);
 105         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 106         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 107
 108         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 109
 110         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 111
 112         if (error)
 113                 goto segv_and_exit;
 114
 115 #ifdef DEBUG_SIG
 116         dump_irix5_sigctx(ctx);
 117 #endif
 118
 119         regs->regs[4] = (unsigned long) signr;
 120         regs->regs[5] = 0; /* XXX sigcode XXX */
 121         regs->regs[6] = regs->regs[29] = sp;
 122         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 123         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 124
 125         return 1;
 126
 127 segv_and_exit:
 128         force_sigsegv(signr, current);
 129         return 0;
 130 }
 131
 132 static int inline
 133 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 134                int signr, sigset_t *oldmask, siginfo_t *info)
 135 {
 136         printk("Aiee: setup_tr_frame wants to be written");
 137         do_exit(SIGSEGV);
 138 }
 139
 140 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 141         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 142 {
 143         int ret;
 144
 145         switch(regs->regs[0]) {
 146         case ERESTARTNOHAND:
 147                 regs->regs[2] = EINTR;
 148                 break;
 149         case ERESTARTSYS:
 150                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 151                         regs->regs[2] = EINTR;
 152                         break;
 153                 }
 154         /* fallthrough */
 155         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 156                 regs->cp0_epc -= 8;
 157         }
 158
 159         regs->regs[0] = 0;              /* Don't deal with this again.  */
 160
 161         if (ka->sa.sa_flags & SA_SIGINFO)
 162                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 163         else
 164                 ret = setup_irix_frame(ka, regs, sig, oldset);
 165
 166         spin_lock_irq(&current->sighand->siglock);
 167         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 168         if (!(ka->sa.sa_flags & SA_NODEFER))
 169                 sigaddset(&current->blocked,sig);
 170         recalc_sigpending();
 171         spin_unlock_irq(&current->sighand->siglock);
 172
 173         return ret;
 174 }
 175
 176 void do_irix_signal(struct pt_regs *regs)
 177 {
 178         struct k_sigaction ka;
 179         siginfo_t info;
 180         int signr;
 181         sigset_t *oldset;
 182
 183         /*
 184          * We want the common case to go fast, which is why we may in certain
 185          * cases get here from kernel mode. Just return without doing anything
 186          * if so.
 187          */
 188         if (!user_mode(regs))
 189                 return;
 190
 191         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 192                 oldset = &current->saved_sigmask;
 193         else
 194                 oldset = &current->blocked;
 195
 196         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 197         if (signr > 0) {
 198                 /* Whee!  Actually deliver the signal.  */
 199                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
 200                         /* a signal was successfully delivered; the saved
 201                          * sigmask will have been stored in the signal frame,
 202                          * and will be restored by sigreturn, so we can simply
 203                          * clear the TIF_RESTORE_SIGMASK flag */
 204                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 205                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 206                 }
 207
 208                 return;
 209         }
 210
 211         /*
 212          * Who's code doesn't conform to the restartable syscall convention
 213          * dies here!!!  The li instruction, a single machine instruction,
 214          * must directly be followed by the syscall instruction.
 215          */
 216         if (regs->regs[0]) {
 217                 if (regs->regs[2] == ERESTARTNOHAND ||
 218                     regs->regs[2] == ERESTARTSYS ||
 219                     regs->regs[2] == ERESTARTNOINTR) {
 220                         regs->cp0_epc -= 8;
 221                 }
 222                 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
 223                         regs->regs[2] = __NR_restart_syscall;
 224                         regs->regs[7] = regs->regs[26];
 225                         regs->cp0_epc -= 4;
 226                 }
 227                 regs->regs[0] = 0;      /* Don't deal with this again.  */
 228         }
 229
 230         /*
 231         * If there's no signal to deliver, we just put the saved sigmask
 232         * back
 233         */
 234         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 235                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 236                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 237         }
 238 }
 239
 240 asmlinkage void
 241 irix_sigreturn(struct pt_regs *regs)
 242 {
 243         struct sigctx_irix5 __user *context, *magic;
 244         unsigned long umask, mask;
 245         u64 *fregs;
 246         u32 usedfp;
 247         int error, sig, i, base = 0;
 248         sigset_t blocked;
 249
 250         /* Always make any pending restarted system calls return -EINTR */
 251         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 252
 253         if (regs->regs[2] == 1000)
 254                 base = 1;
 255
 256         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
 257         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
 258         sig = (int) regs->regs[base + 6];
 259 #ifdef DEBUG_SIG
 260         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 261                current->comm, current->pid, context, magic, sig);
 262 #endif
 263         if (!context)
 264                 context = magic;
 265         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 266                 goto badframe;
 267
 268 #ifdef DEBUG_SIG
 269         dump_irix5_sigctx(context);
 270 #endif
 271
 272         error = __get_user(regs->cp0_epc, &context->pc);
 273         error |= __get_user(umask, &context->rmask);
 274
 275         mask = 2;
 276         for (i = 1; i < 32; i++, mask <<= 1) {
 277                 if (umask & mask)
 278                         error |= __get_user(regs->regs[i], &context->regs[i]);
 279         }
 280         error |= __get_user(regs->hi, &context->hi);
 281         error |= __get_user(regs->lo, &context->lo);
 282
 283         error |= __get_user(usedfp, &context->usedfp);
 284         if ((umask & 1) && usedfp) {
 285                 fregs = (u64 *) &current->thread.fpu;
 286
 287                 for(i = 0; i < 32; i++)
 288                         error |= __get_user(fregs[i], &context->fpregs[i]);
 289                 error |= __get_user(current->thread.fpu.fcr31, &context->fpcsr);
 290         }
 291
 292         /* XXX do sigstack crapola here... XXX */
 293
 294         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 295
 296         if (error)
 297                 goto badframe;
 298
 299         sigdelsetmask(&blocked, ~_BLOCKABLE);
 300         spin_lock_irq(&current->sighand->siglock);
 301         current->blocked = blocked;
 302         recalc_sigpending();
 303         spin_unlock_irq(&current->sighand->siglock);
 304
 305         /*
 306          * Don't let your children do this ...
 307          */
 308         __asm__ __volatile__(
 309                 "move\t$29,%0\n\t"
 310                 "j\tsyscall_exit"
 311                 :/* no outputs */
 312                 :"r" (&regs));
 313                 /* Unreached */
 314
 315 badframe:
 316         force_sig(SIGSEGV, current);
 317 }
 318
 319 struct sigact_irix5 {
 320         int flags;
 321         void (*handler)(int);
 322         u32 sigset[4];
 323         int _unused0[2];
 324 };
 325
 326 #define SIG_SETMASK32   256     /* Goodie from SGI for BSD compatibility:
 327                                    set only the low 32 bit of the sigset.  */
 328
 329 #ifdef DEBUG_SIG
 330 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 331 {
 332         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 333                (unsigned long) p->handler,
 334                (unsigned long) p->sigset[0]);
 335 }
 336 #endif
 337
 338 asmlinkage int
 339 irix_sigaction(int sig, const struct sigaction __user *act,
 340               struct sigaction __user *oact, void __user *trampoline)
 341 {
 342         struct k_sigaction new_ka, old_ka;
 343         int ret;
 344
 345 #ifdef DEBUG_SIG
 346         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 347                (!old ? "0" : "OLD"), trampoline);
 348         if(new) {
 349                 dump_sigact_irix5(new); printk(" ");
 350         }
 351 #endif
 352         if (act) {
 353                 sigset_t mask;
 354                 int err;
 355
 356                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 357                         return -EFAULT;
 358                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 359                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 360
 361                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 362                 if (err)
 363                         return err;
 364
 365                 /*
 366                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 367                  * value for all invocations of sigaction.  Will have to
 368                  * investigate.  POSIX POSIX, die die die...
 369                  */
 370                 new_ka.sa_restorer = trampoline;
 371         }
 372
 373 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 374         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 375
 376         if (!ret && oact) {
 377                 int err;
 378
 379                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 380                         return -EFAULT;
 381
 382                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 383                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 384                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 385                                sizeof(sigset_t)) ? -EFAULT : 0;
 386                 if (err)
 387                         return -EFAULT;
 388         }
 389
 390         return ret;
 391 }
 392
 393 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 394 {
 395         return do_sigpending(set, sizeof(*set));
 396 }
 397
 398 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 399         irix_sigset_t __user *old)
 400 {
 401         sigset_t oldbits, newbits;
 402
 403         if (new) {
 404                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 405                         return -EFAULT;
 406                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 407                         return -EFAULT;
 408                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 409
 410                 spin_lock_irq(&current->sighand->siglock);
 411                 oldbits = current->blocked;
 412
 413                 switch(how) {
 414                 case 1:
 415                         sigorsets(&newbits, &oldbits, &newbits);
 416                         break;
 417
 418                 case 2:
 419                         sigandsets(&newbits, &oldbits, &newbits);
 420                         break;
 421
 422                 case 3:
 423                         break;
 424
 425                 case 256:
 426                         siginitset(&newbits, newbits.sig[0]);
 427                         break;
 428
 429                 default:
 430                         return -EINVAL;
 431                 }
 432                 recalc_sigpending();
 433                 spin_unlock_irq(&current->sighand->siglock);
 434         }
 435         if (old)
 436                 return copy_to_user(old, &current->blocked,
 437                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 438
 439         return 0;
 440 }
 441
 442 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 443 {
 444         sigset_t newset;
 445         sigset_t __user *uset;
 446
 447         uset = (sigset_t __user *) regs->regs[4];
 448         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 449                 return -EFAULT;
 450         sigdelsetmask(&newset, ~_BLOCKABLE);
 451
 452         spin_lock_irq(&current->sighand->siglock);
 453         current->saved_sigmask = current->blocked;
 454         current->blocked = newset;
 455         recalc_sigpending();
 456         spin_unlock_irq(&current->sighand->siglock);
 457
 458         current->state = TASK_INTERRUPTIBLE;
 459         schedule();
 460         set_thread_flag(TIF_RESTORE_SIGMASK);
 461         return -ERESTARTNOHAND;
 462 }
 463
 464 /* hate hate hate... */
 465 struct irix5_siginfo {
 466         int sig, code, error;
 467         union {
 468                 char unused[128 - (3 * 4)]; /* Safety net. */
 469                 struct {
 470                         int pid;
 471                         union {
 472                                 int uid;
 473                                 struct {
 474                                         int utime, status, stime;
 475                                 } child;
 476                         } procdata;
 477                 } procinfo;
 478
 479                 unsigned long fault_addr;
 480
 481                 struct {
 482                         int fd;
 483                         long band;
 484                 } fileinfo;
 485
 486                 unsigned long sigval;
 487         } stuff;
 488 };
 489
 490 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 491         struct irix5_siginfo __user *info, struct timespec __user *tp)
 492 {
 493         long expire = MAX_SCHEDULE_TIMEOUT;
 494         sigset_t kset;
 495         int i, sig, error, timeo = 0;
 496         struct timespec ktp;
 497
 498 #ifdef DEBUG_SIG
 499         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 500                current->comm, current->pid, set, info, tp);
 501 #endif
 502
 503         /* Must always specify the signal set. */
 504         if (!set)
 505                 return -EINVAL;
 506
 507         if (copy_from_user(&kset, set, sizeof(set)))
 508                 return -EFAULT;
 509
 510         if (info && clear_user(info, sizeof(*info))) {
 511                 error = -EFAULT;
 512                 goto out;
 513         }
 514
 515         if (tp) {
 516                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 517                         return -EFAULT;
 518
 519                 if (!ktp.tv_sec && !ktp.tv_nsec)
 520                         return -EINVAL;
 521
 522                 expire = timespec_to_jiffies(&ktp) +
 523                          (ktp.tv_sec || ktp.tv_nsec);
 524         }
 525
 526         while(1) {
 527                 long tmp = 0;
 528
 529                 expire = schedule_timeout_interruptible(expire);
 530
 531                 for (i=0; i<=4; i++)
 532                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 533
 534                 if (tmp)
 535                         break;
 536                 if (!expire) {
 537                         timeo = 1;
 538                         break;
 539                 }
 540                 if (signal_pending(current))
 541                         return -EINTR;
 542         }
 543         if (timeo)
 544                 return -EAGAIN;
 545
 546         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 547                 if (sigismember (&kset, sig))
 548                         continue;
 549                 if (sigismember (&current->pending.signal, sig)) {
 550                         /* XXX need more than this... */
 551                         if (info)
 552                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 553                         return 0;
 554                 }
 555         }
 556
 557         /* Should not get here, but do something sane if we do. */
 558         error = -EINTR;
 559
 560 out:
 561         return error;
 562 }
 563
 564 /* This is here because of irix5_siginfo definition. */
 565 #define IRIX_P_PID    0
 566 #define IRIX_P_PGID   2
 567 #define IRIX_P_ALL    7
 568
 569 #define W_EXITED     1
 570 #define W_TRAPPED    2
 571 #define W_STOPPED    4
 572 #define W_CONT       8
 573 #define W_NOHANG    64
 574
 575 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 576
 577 asmlinkage int irix_waitsys(int type, int pid,
 578         struct irix5_siginfo __user *info, int options,
 579         struct rusage __user *ru)
 580 {
 581         int flag, retval;
 582         DECLARE_WAITQUEUE(wait, current);
 583         struct task_struct *tsk;
 584         struct task_struct *p;
 585         struct list_head *_p;
 586
 587         if (!info)
 588                 return -EINVAL;
 589
 590         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 591                 return -EFAULT;
 592
 593         if (ru)
 594                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 595                         return -EFAULT;
 596
 597         if (options & ~W_MASK)
 598                 return -EINVAL;
 599
 600         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 601                 return -EINVAL;
 602
 603         add_wait_queue(&current->signal->wait_chldexit, &wait);
 604 repeat:
 605         flag = 0;
 606         current->state = TASK_INTERRUPTIBLE;
 607         read_lock(&tasklist_lock);
 608         tsk = current;
 609         list_for_each(_p,&tsk->children) {
 610                 p = list_entry(_p,struct task_struct,sibling);
 611                 if ((type == IRIX_P_PID) && p->pid != pid)
 612                         continue;
 613                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 614                         continue;
 615                 if ((p->exit_signal != SIGCHLD))
 616                         continue;
 617                 flag = 1;
 618                 switch (p->state) {
 619                 case TASK_STOPPED:
 620                         if (!p->exit_code)
 621                                 continue;
 622                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 623                             !(p->ptrace & PT_PTRACED))
 624                                 continue;
 625                         read_unlock(&tasklist_lock);
 626
 627                         /* move to end of parent's list to avoid starvation */
 628                         write_lock_irq(&tasklist_lock);
 629                         remove_parent(p);
 630                         add_parent(p);
 631                         write_unlock_irq(&tasklist_lock);
 632                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 633                         if (retval)
 634                                 goto end_waitsys;
 635
 636                         retval = __put_user(SIGCHLD, &info->sig);
 637                         retval |= __put_user(0, &info->code);
 638                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 639                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 640                                    &info->stuff.procinfo.procdata.child.status);
 641                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 642                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 643                         if (retval)
 644                                 goto end_waitsys;
 645
 646                         p->exit_code = 0;
 647                         goto end_waitsys;
 648
 649                 case EXIT_ZOMBIE:
 650                         current->signal->cutime += p->utime + p->signal->cutime;
 651                         current->signal->cstime += p->stime + p->signal->cstime;
 652                         if (ru != NULL)
 653                                 getrusage(p, RUSAGE_BOTH, ru);
 654                         retval = __put_user(SIGCHLD, &info->sig);
 655                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 656                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 657                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 658                                    &info->stuff.procinfo.procdata.child.status);
 659                         retval |= __put_user(p->utime,
 660                                    &info->stuff.procinfo.procdata.child.utime);
 661                         retval |= __put_user(p->stime,
 662                                    &info->stuff.procinfo.procdata.child.stime);
 663                         if (retval)
 664                                 return retval;
 665
 666                         if (p->real_parent != p->parent) {
 667                                 write_lock_irq(&tasklist_lock);
 668                                 remove_parent(p);
 669                                 p->parent = p->real_parent;
 670                                 add_parent(p);
 671                                 do_notify_parent(p, SIGCHLD);
 672                                 write_unlock_irq(&tasklist_lock);
 673                         } else
 674                                 release_task(p);
 675                         goto end_waitsys;
 676                 default:
 677                         continue;
 678                 }
 679                 tsk = next_thread(tsk);
 680         }
 681         read_unlock(&tasklist_lock);
 682         if (flag) {
 683                 retval = 0;
 684                 if (options & W_NOHANG)
 685                         goto end_waitsys;
 686                 retval = -ERESTARTSYS;
 687                 if (signal_pending(current))
 688                         goto end_waitsys;
 689                 current->state = TASK_INTERRUPTIBLE;
 690                 schedule();
 691                 goto repeat;
 692         }
 693         retval = -ECHILD;
 694 end_waitsys:
 695         current->state = TASK_RUNNING;
 696         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 697
 698         return retval;
 699 }
 700
 701 struct irix5_context {
 702         u32 flags;
 703         u32 link;
 704         u32 sigmask[4];
 705         struct { u32 sp, size, flags; } stack;
 706         int regs[36];
 707         u32 fpregs[32];
 708         u32 fpcsr;
 709         u32 _unused0;
 710         u32 _unused1[47];
 711         u32 weird_graphics_thing;
 712 };
 713
 714 asmlinkage int irix_getcontext(struct pt_regs *regs)
 715 {
 716         int error, i, base = 0;
 717         struct irix5_context __user *ctx;
 718         unsigned long flags;
 719
 720         if (regs->regs[2] == 1000)
 721                 base = 1;
 722         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 723
 724 #ifdef DEBUG_SIG
 725         printk("[%s:%d] irix_getcontext(%p)\n",
 726                current->comm, current->pid, ctx);
 727 #endif
 728
 729         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 730                 return -EFAULT;
 731
 732         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 733
 734         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 735
 736         /* XXX Do sigstack stuff someday... */
 737         error |= __put_user(0, &ctx->stack.sp);
 738         error |= __put_user(0, &ctx->stack.size);
 739         error |= __put_user(0, &ctx->stack.flags);
 740
 741         error |= __put_user(0, &ctx->weird_graphics_thing);
 742         error |= __put_user(0, &ctx->regs[0]);
 743         for (i = 1; i < 32; i++)
 744                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 745         error |= __put_user(regs->lo, &ctx->regs[32]);
 746         error |= __put_user(regs->hi, &ctx->regs[33]);
 747         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 748         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 749
 750         flags = 0x0f;
 751         if (!used_math()) {
 752                 flags &= ~(0x08);
 753         } else {
 754                 /* XXX wheee... */
 755                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 756         }
 757         error |= __put_user(flags, &ctx->flags);
 758
 759         return error;
 760 }
 761
 762 asmlinkage void irix_setcontext(struct pt_regs *regs)
 763 {
 764         struct irix5_context __user *ctx;
 765         int err, base = 0;
 766         u32 flags;
 767
 768         if (regs->regs[2] == 1000)
 769                 base = 1;
 770         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 771
 772 #ifdef DEBUG_SIG
 773         printk("[%s:%d] irix_setcontext(%p)\n",
 774                current->comm, current->pid, ctx);
 775 #endif
 776
 777         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 778                 goto segv_and_exit;
 779
 780         err = __get_user(flags, &ctx->flags);
 781         if (flags & 0x02) {
 782                 /* XXX sigstack garbage, todo... */
 783                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 784         }
 785
 786         if (flags & 0x04) {
 787                 int i;
 788
 789                 /* XXX extra control block stuff... todo... */
 790                 for (i = 1; i < 32; i++)
 791                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 792                 err |= __get_user(regs->lo, &ctx->regs[32]);
 793                 err |= __get_user(regs->hi, &ctx->regs[33]);
 794                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 795         }
 796
 797         if (flags & 0x08)
 798                 /* XXX fpu context, blah... */
 799                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 800
 801         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 802         if (err)
 803                 goto segv_and_exit;
 804
 805         /*
 806          * Don't let your children do this ...
 807          */
 808         __asm__ __volatile__(
 809                 "move\t$29,%0\n\t"
 810                 "j\tsyscall_exit"
 811                 :/* no outputs */
 812                 :"r" (&regs));
 813                 /* Unreached */
 814
 815 segv_and_exit:
 816         force_sigsegv(SIGSEGV, current);
 817 }
 818
 819 struct irix_sigstack {
 820         unsigned long sp;
 821         int status;
 822 };
 823
 824 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 825         struct irix_sigstack __user *old)
 826 {
 827 #ifdef DEBUG_SIG
 828         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 829                current->comm, current->pid, new, old);
 830 #endif
 831         if (new) {
 832                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 833                         return -EFAULT;
 834         }
 835
 836         if (old) {
 837                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 838                         return -EFAULT;
 839         }
 840
 841         return 0;
 842 }
 843
 844 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 845
 846 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 847                                 struct irix_sigaltstack __user *old)
 848 {
 849 #ifdef DEBUG_SIG
 850         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 851                current->comm, current->pid, new, old);
 852 #endif
 853         if (new)
 854                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 855                         return -EFAULT;
 856
 857         if (old) {
 858                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 859                         return -EFAULT;
 860         }
 861
 862         return 0;
 863 }
 864
 865 struct irix_procset {
 866         int cmd, ltype, lid, rtype, rid;
 867 };
 868
 869 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 870 {
 871         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 872                 return -EFAULT;
 873 #ifdef DEBUG_SIG
 874         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 875                current->comm, current->pid,
 876                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 877                sig);
 878 #endif
 879         return -EINVAL;
 880 }