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