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 #ifdef DEBUG_SIG
 327 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 328 {
 329         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 330                (unsigned long) p->handler,
 331                (unsigned long) p->sigset[0]);
 332 }
 333 #endif
 334
 335 asmlinkage int
 336 irix_sigaction(int sig, const struct sigaction __user *act,
 337               struct sigaction __user *oact, void __user *trampoline)
 338 {
 339         struct k_sigaction new_ka, old_ka;
 340         int ret;
 341
 342 #ifdef DEBUG_SIG
 343         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 344                (!old ? "0" : "OLD"), trampoline);
 345         if(new) {
 346                 dump_sigact_irix5(new); printk(" ");
 347         }
 348 #endif
 349         if (act) {
 350                 sigset_t mask;
 351                 int err;
 352
 353                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 354                         return -EFAULT;
 355                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 356                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 357
 358                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 359                 if (err)
 360                         return err;
 361
 362                 /*
 363                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 364                  * value for all invocations of sigaction.  Will have to
 365                  * investigate.  POSIX POSIX, die die die...
 366                  */
 367                 new_ka.sa_restorer = trampoline;
 368         }
 369
 370 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 371         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 372
 373         if (!ret && oact) {
 374                 int err;
 375
 376                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 377                         return -EFAULT;
 378
 379                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 380                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 381                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 382                                sizeof(sigset_t)) ? -EFAULT : 0;
 383                 if (err)
 384                         return -EFAULT;
 385         }
 386
 387         return ret;
 388 }
 389
 390 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 391 {
 392         return do_sigpending(set, sizeof(*set));
 393 }
 394
 395 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 396         irix_sigset_t __user *old)
 397 {
 398         sigset_t oldbits, newbits;
 399
 400         if (new) {
 401                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 402                         return -EFAULT;
 403                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 404                         return -EFAULT;
 405                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 406
 407                 spin_lock_irq(&current->sighand->siglock);
 408                 oldbits = current->blocked;
 409
 410                 switch(how) {
 411                 case 1:
 412                         sigorsets(&newbits, &oldbits, &newbits);
 413                         break;
 414
 415                 case 2:
 416                         sigandsets(&newbits, &oldbits, &newbits);
 417                         break;
 418
 419                 case 3:
 420                         break;
 421
 422                 case 256:
 423                         siginitset(&newbits, newbits.sig[0]);
 424                         break;
 425
 426                 default:
 427                         return -EINVAL;
 428                 }
 429                 recalc_sigpending();
 430                 spin_unlock_irq(&current->sighand->siglock);
 431         }
 432         if (old)
 433                 return copy_to_user(old, &current->blocked,
 434                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 435
 436         return 0;
 437 }
 438
 439 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 440 {
 441         sigset_t newset;
 442         sigset_t __user *uset;
 443
 444         uset = (sigset_t __user *) regs->regs[4];
 445         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 446                 return -EFAULT;
 447         sigdelsetmask(&newset, ~_BLOCKABLE);
 448
 449         spin_lock_irq(&current->sighand->siglock);
 450         current->saved_sigmask = current->blocked;
 451         current->blocked = newset;
 452         recalc_sigpending();
 453         spin_unlock_irq(&current->sighand->siglock);
 454
 455         current->state = TASK_INTERRUPTIBLE;
 456         schedule();
 457         set_thread_flag(TIF_RESTORE_SIGMASK);
 458         return -ERESTARTNOHAND;
 459 }
 460
 461 /* hate hate hate... */
 462 struct irix5_siginfo {
 463         int sig, code, error;
 464         union {
 465                 char unused[128 - (3 * 4)]; /* Safety net. */
 466                 struct {
 467                         int pid;
 468                         union {
 469                                 int uid;
 470                                 struct {
 471                                         int utime, status, stime;
 472                                 } child;
 473                         } procdata;
 474                 } procinfo;
 475
 476                 unsigned long fault_addr;
 477
 478                 struct {
 479                         int fd;
 480                         long band;
 481                 } fileinfo;
 482
 483                 unsigned long sigval;
 484         } stuff;
 485 };
 486
 487 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 488         struct irix5_siginfo __user *info, struct timespec __user *tp)
 489 {
 490         long expire = MAX_SCHEDULE_TIMEOUT;
 491         sigset_t kset;
 492         int i, sig, error, timeo = 0;
 493         struct timespec ktp;
 494
 495 #ifdef DEBUG_SIG
 496         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 497                current->comm, current->pid, set, info, tp);
 498 #endif
 499
 500         /* Must always specify the signal set. */
 501         if (!set)
 502                 return -EINVAL;
 503
 504         if (copy_from_user(&kset, set, sizeof(set)))
 505                 return -EFAULT;
 506
 507         if (info && clear_user(info, sizeof(*info))) {
 508                 error = -EFAULT;
 509                 goto out;
 510         }
 511
 512         if (tp) {
 513                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 514                         return -EFAULT;
 515
 516                 if (!ktp.tv_sec && !ktp.tv_nsec)
 517                         return -EINVAL;
 518
 519                 expire = timespec_to_jiffies(&ktp) +
 520                          (ktp.tv_sec || ktp.tv_nsec);
 521         }
 522
 523         while(1) {
 524                 long tmp = 0;
 525
 526                 expire = schedule_timeout_interruptible(expire);
 527
 528                 for (i=0; i<=4; i++)
 529                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 530
 531                 if (tmp)
 532                         break;
 533                 if (!expire) {
 534                         timeo = 1;
 535                         break;
 536                 }
 537                 if (signal_pending(current))
 538                         return -EINTR;
 539         }
 540         if (timeo)
 541                 return -EAGAIN;
 542
 543         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 544                 if (sigismember (&kset, sig))
 545                         continue;
 546                 if (sigismember (&current->pending.signal, sig)) {
 547                         /* XXX need more than this... */
 548                         if (info)
 549                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 550                         return 0;
 551                 }
 552         }
 553
 554         /* Should not get here, but do something sane if we do. */
 555         error = -EINTR;
 556
 557 out:
 558         return error;
 559 }
 560
 561 /* This is here because of irix5_siginfo definition. */
 562 #define IRIX_P_PID    0
 563 #define IRIX_P_PGID   2
 564 #define IRIX_P_ALL    7
 565
 566 #define W_EXITED     1
 567 #define W_TRAPPED    2
 568 #define W_STOPPED    4
 569 #define W_CONT       8
 570 #define W_NOHANG    64
 571
 572 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 573
 574 asmlinkage int irix_waitsys(int type, int pid,
 575         struct irix5_siginfo __user *info, int options,
 576         struct rusage __user *ru)
 577 {
 578         int flag, retval;
 579         DECLARE_WAITQUEUE(wait, current);
 580         struct task_struct *tsk;
 581         struct task_struct *p;
 582         struct list_head *_p;
 583
 584         if (!info)
 585                 return -EINVAL;
 586
 587         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 588                 return -EFAULT;
 589
 590         if (ru)
 591                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 592                         return -EFAULT;
 593
 594         if (options & ~W_MASK)
 595                 return -EINVAL;
 596
 597         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 598                 return -EINVAL;
 599
 600         add_wait_queue(&current->signal->wait_chldexit, &wait);
 601 repeat:
 602         flag = 0;
 603         current->state = TASK_INTERRUPTIBLE;
 604         read_lock(&tasklist_lock);
 605         tsk = current;
 606         list_for_each(_p,&tsk->children) {
 607                 p = list_entry(_p,struct task_struct,sibling);
 608                 if ((type == IRIX_P_PID) && p->pid != pid)
 609                         continue;
 610                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 611                         continue;
 612                 if ((p->exit_signal != SIGCHLD))
 613                         continue;
 614                 flag = 1;
 615                 switch (p->state) {
 616                 case TASK_STOPPED:
 617                         if (!p->exit_code)
 618                                 continue;
 619                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 620                             !(p->ptrace & PT_PTRACED))
 621                                 continue;
 622                         read_unlock(&tasklist_lock);
 623
 624                         /* move to end of parent's list to avoid starvation */
 625                         write_lock_irq(&tasklist_lock);
 626                         remove_parent(p);
 627                         add_parent(p);
 628                         write_unlock_irq(&tasklist_lock);
 629                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 630                         if (retval)
 631                                 goto end_waitsys;
 632
 633                         retval = __put_user(SIGCHLD, &info->sig);
 634                         retval |= __put_user(0, &info->code);
 635                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 636                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 637                                    &info->stuff.procinfo.procdata.child.status);
 638                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 639                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 640                         if (retval)
 641                                 goto end_waitsys;
 642
 643                         p->exit_code = 0;
 644                         goto end_waitsys;
 645
 646                 case EXIT_ZOMBIE:
 647                         current->signal->cutime += p->utime + p->signal->cutime;
 648                         current->signal->cstime += p->stime + p->signal->cstime;
 649                         if (ru != NULL)
 650                                 getrusage(p, RUSAGE_BOTH, ru);
 651                         retval = __put_user(SIGCHLD, &info->sig);
 652                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 653                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 654                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 655                                    &info->stuff.procinfo.procdata.child.status);
 656                         retval |= __put_user(p->utime,
 657                                    &info->stuff.procinfo.procdata.child.utime);
 658                         retval |= __put_user(p->stime,
 659                                    &info->stuff.procinfo.procdata.child.stime);
 660                         if (retval)
 661                                 return retval;
 662
 663                         if (p->real_parent != p->parent) {
 664                                 write_lock_irq(&tasklist_lock);
 665                                 remove_parent(p);
 666                                 p->parent = p->real_parent;
 667                                 add_parent(p);
 668                                 do_notify_parent(p, SIGCHLD);
 669                                 write_unlock_irq(&tasklist_lock);
 670                         } else
 671                                 release_task(p);
 672                         goto end_waitsys;
 673                 default:
 674                         continue;
 675                 }
 676                 tsk = next_thread(tsk);
 677         }
 678         read_unlock(&tasklist_lock);
 679         if (flag) {
 680                 retval = 0;
 681                 if (options & W_NOHANG)
 682                         goto end_waitsys;
 683                 retval = -ERESTARTSYS;
 684                 if (signal_pending(current))
 685                         goto end_waitsys;
 686                 current->state = TASK_INTERRUPTIBLE;
 687                 schedule();
 688                 goto repeat;
 689         }
 690         retval = -ECHILD;
 691 end_waitsys:
 692         current->state = TASK_RUNNING;
 693         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 694
 695         return retval;
 696 }
 697
 698 struct irix5_context {
 699         u32 flags;
 700         u32 link;
 701         u32 sigmask[4];
 702         struct { u32 sp, size, flags; } stack;
 703         int regs[36];
 704         u32 fpregs[32];
 705         u32 fpcsr;
 706         u32 _unused0;
 707         u32 _unused1[47];
 708         u32 weird_graphics_thing;
 709 };
 710
 711 asmlinkage int irix_getcontext(struct pt_regs *regs)
 712 {
 713         int error, i, base = 0;
 714         struct irix5_context __user *ctx;
 715         unsigned long flags;
 716
 717         if (regs->regs[2] == 1000)
 718                 base = 1;
 719         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 720
 721 #ifdef DEBUG_SIG
 722         printk("[%s:%d] irix_getcontext(%p)\n",
 723                current->comm, current->pid, ctx);
 724 #endif
 725
 726         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 727                 return -EFAULT;
 728
 729         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 730
 731         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 732
 733         /* XXX Do sigstack stuff someday... */
 734         error |= __put_user(0, &ctx->stack.sp);
 735         error |= __put_user(0, &ctx->stack.size);
 736         error |= __put_user(0, &ctx->stack.flags);
 737
 738         error |= __put_user(0, &ctx->weird_graphics_thing);
 739         error |= __put_user(0, &ctx->regs[0]);
 740         for (i = 1; i < 32; i++)
 741                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 742         error |= __put_user(regs->lo, &ctx->regs[32]);
 743         error |= __put_user(regs->hi, &ctx->regs[33]);
 744         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 745         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 746
 747         flags = 0x0f;
 748         if (!used_math()) {
 749                 flags &= ~(0x08);
 750         } else {
 751                 /* XXX wheee... */
 752                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 753         }
 754         error |= __put_user(flags, &ctx->flags);
 755
 756         return error;
 757 }
 758
 759 asmlinkage void irix_setcontext(struct pt_regs *regs)
 760 {
 761         struct irix5_context __user *ctx;
 762         int err, base = 0;
 763         u32 flags;
 764
 765         if (regs->regs[2] == 1000)
 766                 base = 1;
 767         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 768
 769 #ifdef DEBUG_SIG
 770         printk("[%s:%d] irix_setcontext(%p)\n",
 771                current->comm, current->pid, ctx);
 772 #endif
 773
 774         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 775                 goto segv_and_exit;
 776
 777         err = __get_user(flags, &ctx->flags);
 778         if (flags & 0x02) {
 779                 /* XXX sigstack garbage, todo... */
 780                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 781         }
 782
 783         if (flags & 0x04) {
 784                 int i;
 785
 786                 /* XXX extra control block stuff... todo... */
 787                 for (i = 1; i < 32; i++)
 788                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 789                 err |= __get_user(regs->lo, &ctx->regs[32]);
 790                 err |= __get_user(regs->hi, &ctx->regs[33]);
 791                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 792         }
 793
 794         if (flags & 0x08)
 795                 /* XXX fpu context, blah... */
 796                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 797
 798         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 799         if (err)
 800                 goto segv_and_exit;
 801
 802         /*
 803          * Don't let your children do this ...
 804          */
 805         __asm__ __volatile__(
 806                 "move\t$29,%0\n\t"
 807                 "j\tsyscall_exit"
 808                 :/* no outputs */
 809                 :"r" (&regs));
 810                 /* Unreached */
 811
 812 segv_and_exit:
 813         force_sigsegv(SIGSEGV, current);
 814 }
 815
 816 struct irix_sigstack {
 817         unsigned long sp;
 818         int status;
 819 };
 820
 821 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 822         struct irix_sigstack __user *old)
 823 {
 824 #ifdef DEBUG_SIG
 825         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 826                current->comm, current->pid, new, old);
 827 #endif
 828         if (new) {
 829                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 830                         return -EFAULT;
 831         }
 832
 833         if (old) {
 834                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 835                         return -EFAULT;
 836         }
 837
 838         return 0;
 839 }
 840
 841 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 842
 843 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 844                                 struct irix_sigaltstack __user *old)
 845 {
 846 #ifdef DEBUG_SIG
 847         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 848                current->comm, current->pid, new, old);
 849 #endif
 850         if (new)
 851                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 852                         return -EFAULT;
 853
 854         if (old) {
 855                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 856                         return -EFAULT;
 857         }
 858
 859         return 0;
 860 }
 861
 862 struct irix_procset {
 863         int cmd, ltype, lid, rtype, rid;
 864 };
 865
 866 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 867 {
 868         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 869                 return -EFAULT;
 870 #ifdef DEBUG_SIG
 871         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 872                current->comm, current->pid,
 873                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 874                sig);
 875 #endif
 876         return -EINVAL;
 877 }