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         }
 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 #ifdef DEBUG_SIG
 326 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 327 {
 328         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 329                (unsigned long) p->handler,
 330                (unsigned long) p->sigset[0]);
 331 }
 332 #endif
 333
 334 asmlinkage int
 335 irix_sigaction(int sig, const struct sigaction __user *act,
 336               struct sigaction __user *oact, void __user *trampoline)
 337 {
 338         struct k_sigaction new_ka, old_ka;
 339         int ret;
 340
 341 #ifdef DEBUG_SIG
 342         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 343                (!old ? "0" : "OLD"), trampoline);
 344         if(new) {
 345                 dump_sigact_irix5(new); printk(" ");
 346         }
 347 #endif
 348         if (act) {
 349                 sigset_t mask;
 350                 int err;
 351
 352                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 353                         return -EFAULT;
 354                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 355                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 356
 357                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 358                 if (err)
 359                         return err;
 360
 361                 /*
 362                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 363                  * value for all invocations of sigaction.  Will have to
 364                  * investigate.  POSIX POSIX, die die die...
 365                  */
 366                 new_ka.sa_restorer = trampoline;
 367         }
 368
 369 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 370         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 371
 372         if (!ret && oact) {
 373                 int err;
 374
 375                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 376                         return -EFAULT;
 377
 378                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 379                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 380                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 381                                sizeof(sigset_t)) ? -EFAULT : 0;
 382                 if (err)
 383                         return -EFAULT;
 384         }
 385
 386         return ret;
 387 }
 388
 389 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 390 {
 391         return do_sigpending(set, sizeof(*set));
 392 }
 393
 394 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 395         irix_sigset_t __user *old)
 396 {
 397         sigset_t oldbits, newbits;
 398
 399         if (new) {
 400                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 401                         return -EFAULT;
 402                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 403                         return -EFAULT;
 404                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 405
 406                 spin_lock_irq(&current->sighand->siglock);
 407                 oldbits = current->blocked;
 408
 409                 switch(how) {
 410                 case 1:
 411                         sigorsets(&newbits, &oldbits, &newbits);
 412                         break;
 413
 414                 case 2:
 415                         sigandsets(&newbits, &oldbits, &newbits);
 416                         break;
 417
 418                 case 3:
 419                         break;
 420
 421                 case 256:
 422                         siginitset(&newbits, newbits.sig[0]);
 423                         break;
 424
 425                 default:
 426                         return -EINVAL;
 427                 }
 428                 recalc_sigpending();
 429                 spin_unlock_irq(&current->sighand->siglock);
 430         }
 431         if (old)
 432                 return copy_to_user(old, &current->blocked,
 433                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 434
 435         return 0;
 436 }
 437
 438 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 439 {
 440         sigset_t newset;
 441         sigset_t __user *uset;
 442
 443         uset = (sigset_t __user *) regs->regs[4];
 444         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 445                 return -EFAULT;
 446         sigdelsetmask(&newset, ~_BLOCKABLE);
 447
 448         spin_lock_irq(&current->sighand->siglock);
 449         current->saved_sigmask = current->blocked;
 450         current->blocked = newset;
 451         recalc_sigpending();
 452         spin_unlock_irq(&current->sighand->siglock);
 453
 454         current->state = TASK_INTERRUPTIBLE;
 455         schedule();
 456         set_thread_flag(TIF_RESTORE_SIGMASK);
 457         return -ERESTARTNOHAND;
 458 }
 459
 460 /* hate hate hate... */
 461 struct irix5_siginfo {
 462         int sig, code, error;
 463         union {
 464                 char unused[128 - (3 * 4)]; /* Safety net. */
 465                 struct {
 466                         int pid;
 467                         union {
 468                                 int uid;
 469                                 struct {
 470                                         int utime, status, stime;
 471                                 } child;
 472                         } procdata;
 473                 } procinfo;
 474
 475                 unsigned long fault_addr;
 476
 477                 struct {
 478                         int fd;
 479                         long band;
 480                 } fileinfo;
 481
 482                 unsigned long sigval;
 483         } stuff;
 484 };
 485
 486 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 487         struct irix5_siginfo __user *info, struct timespec __user *tp)
 488 {
 489         long expire = MAX_SCHEDULE_TIMEOUT;
 490         sigset_t kset;
 491         int i, sig, error, timeo = 0;
 492         struct timespec ktp;
 493
 494 #ifdef DEBUG_SIG
 495         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 496                current->comm, current->pid, set, info, tp);
 497 #endif
 498
 499         /* Must always specify the signal set. */
 500         if (!set)
 501                 return -EINVAL;
 502
 503         if (copy_from_user(&kset, set, sizeof(set)))
 504                 return -EFAULT;
 505
 506         if (info && clear_user(info, sizeof(*info))) {
 507                 error = -EFAULT;
 508                 goto out;
 509         }
 510
 511         if (tp) {
 512                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 513                         return -EFAULT;
 514
 515                 if (!ktp.tv_sec && !ktp.tv_nsec)
 516                         return -EINVAL;
 517
 518                 expire = timespec_to_jiffies(&ktp) +
 519                          (ktp.tv_sec || ktp.tv_nsec);
 520         }
 521
 522         while(1) {
 523                 long tmp = 0;
 524
 525                 expire = schedule_timeout_interruptible(expire);
 526
 527                 for (i=0; i<=4; i++)
 528                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 529
 530                 if (tmp)
 531                         break;
 532                 if (!expire) {
 533                         timeo = 1;
 534                         break;
 535                 }
 536                 if (signal_pending(current))
 537                         return -EINTR;
 538         }
 539         if (timeo)
 540                 return -EAGAIN;
 541
 542         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 543                 if (sigismember (&kset, sig))
 544                         continue;
 545                 if (sigismember (&current->pending.signal, sig)) {
 546                         /* XXX need more than this... */
 547                         if (info)
 548                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 549                         return 0;
 550                 }
 551         }
 552
 553         /* Should not get here, but do something sane if we do. */
 554         error = -EINTR;
 555
 556 out:
 557         return error;
 558 }
 559
 560 /* This is here because of irix5_siginfo definition. */
 561 #define IRIX_P_PID    0
 562 #define IRIX_P_PGID   2
 563 #define IRIX_P_ALL    7
 564
 565 #define W_EXITED     1
 566 #define W_TRAPPED    2
 567 #define W_STOPPED    4
 568 #define W_CONT       8
 569 #define W_NOHANG    64
 570
 571 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 572
 573 asmlinkage int irix_waitsys(int type, int pid,
 574         struct irix5_siginfo __user *info, int options,
 575         struct rusage __user *ru)
 576 {
 577         int flag, retval;
 578         DECLARE_WAITQUEUE(wait, current);
 579         struct task_struct *tsk;
 580         struct task_struct *p;
 581         struct list_head *_p;
 582
 583         if (!info)
 584                 return -EINVAL;
 585
 586         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 587                 return -EFAULT;
 588
 589         if (ru)
 590                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 591                         return -EFAULT;
 592
 593         if (options & ~W_MASK)
 594                 return -EINVAL;
 595
 596         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 597                 return -EINVAL;
 598
 599         add_wait_queue(&current->signal->wait_chldexit, &wait);
 600 repeat:
 601         flag = 0;
 602         current->state = TASK_INTERRUPTIBLE;
 603         read_lock(&tasklist_lock);
 604         tsk = current;
 605         list_for_each(_p,&tsk->children) {
 606                 p = list_entry(_p,struct task_struct,sibling);
 607                 if ((type == IRIX_P_PID) && p->pid != pid)
 608                         continue;
 609                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 610                         continue;
 611                 if ((p->exit_signal != SIGCHLD))
 612                         continue;
 613                 flag = 1;
 614                 switch (p->state) {
 615                 case TASK_STOPPED:
 616                         if (!p->exit_code)
 617                                 continue;
 618                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 619                             !(p->ptrace & PT_PTRACED))
 620                                 continue;
 621                         read_unlock(&tasklist_lock);
 622
 623                         /* move to end of parent's list to avoid starvation */
 624                         write_lock_irq(&tasklist_lock);
 625                         remove_parent(p);
 626                         add_parent(p);
 627                         write_unlock_irq(&tasklist_lock);
 628                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 629                         if (retval)
 630                                 goto end_waitsys;
 631
 632                         retval = __put_user(SIGCHLD, &info->sig);
 633                         retval |= __put_user(0, &info->code);
 634                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 635                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 636                                    &info->stuff.procinfo.procdata.child.status);
 637                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 638                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 639                         if (retval)
 640                                 goto end_waitsys;
 641
 642                         p->exit_code = 0;
 643                         goto end_waitsys;
 644
 645                 case EXIT_ZOMBIE:
 646                         current->signal->cutime += p->utime + p->signal->cutime;
 647                         current->signal->cstime += p->stime + p->signal->cstime;
 648                         if (ru != NULL)
 649                                 getrusage(p, RUSAGE_BOTH, ru);
 650                         retval = __put_user(SIGCHLD, &info->sig);
 651                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 652                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 653                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 654                                    &info->stuff.procinfo.procdata.child.status);
 655                         retval |= __put_user(p->utime,
 656                                    &info->stuff.procinfo.procdata.child.utime);
 657                         retval |= __put_user(p->stime,
 658                                    &info->stuff.procinfo.procdata.child.stime);
 659                         if (retval)
 660                                 return retval;
 661
 662                         if (p->real_parent != p->parent) {
 663                                 write_lock_irq(&tasklist_lock);
 664                                 remove_parent(p);
 665                                 p->parent = p->real_parent;
 666                                 add_parent(p);
 667                                 do_notify_parent(p, SIGCHLD);
 668                                 write_unlock_irq(&tasklist_lock);
 669                         } else
 670                                 release_task(p);
 671                         goto end_waitsys;
 672                 default:
 673                         continue;
 674                 }
 675                 tsk = next_thread(tsk);
 676         }
 677         read_unlock(&tasklist_lock);
 678         if (flag) {
 679                 retval = 0;
 680                 if (options & W_NOHANG)
 681                         goto end_waitsys;
 682                 retval = -ERESTARTSYS;
 683                 if (signal_pending(current))
 684                         goto end_waitsys;
 685                 current->state = TASK_INTERRUPTIBLE;
 686                 schedule();
 687                 goto repeat;
 688         }
 689         retval = -ECHILD;
 690 end_waitsys:
 691         current->state = TASK_RUNNING;
 692         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 693
 694         return retval;
 695 }
 696
 697 struct irix5_context {
 698         u32 flags;
 699         u32 link;
 700         u32 sigmask[4];
 701         struct { u32 sp, size, flags; } stack;
 702         int regs[36];
 703         u32 fpregs[32];
 704         u32 fpcsr;
 705         u32 _unused0;
 706         u32 _unused1[47];
 707         u32 weird_graphics_thing;
 708 };
 709
 710 asmlinkage int irix_getcontext(struct pt_regs *regs)
 711 {
 712         int error, i, base = 0;
 713         struct irix5_context __user *ctx;
 714         unsigned long flags;
 715
 716         if (regs->regs[2] == 1000)
 717                 base = 1;
 718         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 719
 720 #ifdef DEBUG_SIG
 721         printk("[%s:%d] irix_getcontext(%p)\n",
 722                current->comm, current->pid, ctx);
 723 #endif
 724
 725         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 726                 return -EFAULT;
 727
 728         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 729
 730         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 731
 732         /* XXX Do sigstack stuff someday... */
 733         error |= __put_user(0, &ctx->stack.sp);
 734         error |= __put_user(0, &ctx->stack.size);
 735         error |= __put_user(0, &ctx->stack.flags);
 736
 737         error |= __put_user(0, &ctx->weird_graphics_thing);
 738         error |= __put_user(0, &ctx->regs[0]);
 739         for (i = 1; i < 32; i++)
 740                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 741         error |= __put_user(regs->lo, &ctx->regs[32]);
 742         error |= __put_user(regs->hi, &ctx->regs[33]);
 743         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 744         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 745
 746         flags = 0x0f;
 747         if (!used_math()) {
 748                 flags &= ~(0x08);
 749         } else {
 750                 /* XXX wheee... */
 751                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 752         }
 753         error |= __put_user(flags, &ctx->flags);
 754
 755         return error;
 756 }
 757
 758 asmlinkage void irix_setcontext(struct pt_regs *regs)
 759 {
 760         struct irix5_context __user *ctx;
 761         int err, base = 0;
 762         u32 flags;
 763
 764         if (regs->regs[2] == 1000)
 765                 base = 1;
 766         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 767
 768 #ifdef DEBUG_SIG
 769         printk("[%s:%d] irix_setcontext(%p)\n",
 770                current->comm, current->pid, ctx);
 771 #endif
 772
 773         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 774                 goto segv_and_exit;
 775
 776         err = __get_user(flags, &ctx->flags);
 777         if (flags & 0x02) {
 778                 /* XXX sigstack garbage, todo... */
 779                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 780         }
 781
 782         if (flags & 0x04) {
 783                 int i;
 784
 785                 /* XXX extra control block stuff... todo... */
 786                 for (i = 1; i < 32; i++)
 787                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 788                 err |= __get_user(regs->lo, &ctx->regs[32]);
 789                 err |= __get_user(regs->hi, &ctx->regs[33]);
 790                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 791         }
 792
 793         if (flags & 0x08)
 794                 /* XXX fpu context, blah... */
 795                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 796
 797         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 798         if (err)
 799                 goto segv_and_exit;
 800
 801         /*
 802          * Don't let your children do this ...
 803          */
 804         __asm__ __volatile__(
 805                 "move\t$29,%0\n\t"
 806                 "j\tsyscall_exit"
 807                 :/* no outputs */
 808                 :"r" (&regs));
 809                 /* Unreached */
 810
 811 segv_and_exit:
 812         force_sigsegv(SIGSEGV, current);
 813 }
 814
 815 struct irix_sigstack {
 816         unsigned long sp;
 817         int status;
 818 };
 819
 820 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 821         struct irix_sigstack __user *old)
 822 {
 823 #ifdef DEBUG_SIG
 824         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 825                current->comm, current->pid, new, old);
 826 #endif
 827         if (new) {
 828                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 829                         return -EFAULT;
 830         }
 831
 832         if (old) {
 833                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 834                         return -EFAULT;
 835         }
 836
 837         return 0;
 838 }
 839
 840 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 841
 842 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 843                                 struct irix_sigaltstack __user *old)
 844 {
 845 #ifdef DEBUG_SIG
 846         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 847                current->comm, current->pid, new, old);
 848 #endif
 849         if (new)
 850                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 851                         return -EFAULT;
 852
 853         if (old) {
 854                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 855                         return -EFAULT;
 856         }
 857
 858         return 0;
 859 }
 860
 861 struct irix_procset {
 862         int cmd, ltype, lid, rtype, rid;
 863 };
 864
 865 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 866 {
 867         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 868                 return -EFAULT;
 869 #ifdef DEBUG_SIG
 870         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 871                current->comm, current->pid,
 872                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 873                sig);
 874 #endif
 875         return -EINVAL;
 876 }