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
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19
  20 #undef DEBUG_SIG
  21
  22 #define _S(nr) (1<<((nr)-1))
  23
  24 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  25
  26 typedef struct {
  27         unsigned long sig[4];
  28 } irix_sigset_t;
  29
  30 struct sigctx_irix5 {
  31         u32 rmask, cp0_status;
  32         u64 pc;
  33         u64 regs[32];
  34         u64 fpregs[32];
  35         u32 usedfp, fpcsr, fpeir, sstk_flags;
  36         u64 hi, lo;
  37         u64 cp0_cause, cp0_badvaddr, _unused0;
  38         irix_sigset_t sigset;
  39         u64 weird_fpu_thing;
  40         u64 _unused1[31];
  41 };
  42
  43 #ifdef DEBUG_SIG
  44 /* Debugging */
  45 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  46 {
  47         int i;
  48
  49         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  50                (unsigned long) c->rmask,
  51                (unsigned long) c->cp0_status,
  52                (unsigned long) c->pc);
  53         printk("regs: ");
  54         for(i = 0; i < 16; i++)
  55                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  56         printk("\nregs: ");
  57         for(i = 16; i < 32; i++)
  58                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  59         printk("\nfpregs: ");
  60         for(i = 0; i < 16; i++)
  61                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  62         printk("\nfpregs: ");
  63         for(i = 16; i < 32; i++)
  64                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  65         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  66                (int) c->usedfp, (unsigned long) c->fpcsr,
  67                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  68         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  69                (unsigned long) c->hi, (unsigned long) c->lo,
  70                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  71         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  72                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  73                (unsigned long) c->sigset.sig[1],
  74                (unsigned long) c->sigset.sig[2],
  75                (unsigned long) c->sigset.sig[3]);
  76 }
  77 #endif
  78
  79 static void setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  80                              int signr, sigset_t *oldmask)
  81 {
  82         unsigned long sp;
  83         struct sigctx_irix5 *ctx;
  84         int i;
  85
  86         sp = regs->regs[29];
  87         sp -= sizeof(struct sigctx_irix5);
  88         sp &= ~(0xf);
  89         ctx = (struct sigctx_irix5 *) sp;
  90         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  91                 goto segv_and_exit;
  92
  93         __put_user(0, &ctx->weird_fpu_thing);
  94         __put_user(~(0x00000001), &ctx->rmask);
  95         __put_user(0, &ctx->regs[0]);
  96         for(i = 1; i < 32; i++)
  97                 __put_user((u64) regs->regs[i], &ctx->regs[i]);
  98
  99         __put_user((u64) regs->hi, &ctx->hi);
 100         __put_user((u64) regs->lo, &ctx->lo);
 101         __put_user((u64) regs->cp0_epc, &ctx->pc);
 102         __put_user(!!used_math(), &ctx->usedfp);
 103         __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 104         __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 105
 106         __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 107
 108         __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t));
 109
 110 #ifdef DEBUG_SIG
 111         dump_irix5_sigctx(ctx);
 112 #endif
 113
 114         regs->regs[4] = (unsigned long) signr;
 115         regs->regs[5] = 0; /* XXX sigcode XXX */
 116         regs->regs[6] = regs->regs[29] = sp;
 117         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 118         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 119
 120         return;
 121
 122 segv_and_exit:
 123         force_sigsegv(signr, current);
 124 }
 125
 126 static void inline
 127 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 128                int signr, sigset_t *oldmask, siginfo_t *info)
 129 {
 130         printk("Aiee: setup_tr_frame wants to be written");
 131         do_exit(SIGSEGV);
 132 }
 133
 134 static inline void handle_signal(unsigned long sig, siginfo_t *info,
 135         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 136 {
 137         switch(regs->regs[0]) {
 138         case ERESTARTNOHAND:
 139                 regs->regs[2] = EINTR;
 140                 break;
 141         case ERESTARTSYS:
 142                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 143                         regs->regs[2] = EINTR;
 144                         break;
 145                 }
 146         /* fallthrough */
 147         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 148                 regs->cp0_epc -= 8;
 149         }
 150
 151         regs->regs[0] = 0;              /* Don't deal with this again.  */
 152
 153         if (ka->sa.sa_flags & SA_SIGINFO)
 154                 setup_irix_rt_frame(ka, regs, sig, oldset, info);
 155         else
 156                 setup_irix_frame(ka, regs, sig, oldset);
 157
 158         if (!(ka->sa.sa_flags & SA_NODEFER)) {
 159                 spin_lock_irq(&current->sighand->siglock);
 160                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 161                 sigaddset(&current->blocked,sig);
 162                 recalc_sigpending();
 163                 spin_unlock_irq(&current->sighand->siglock);
 164         }
 165 }
 166
 167 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 168 {
 169         struct k_sigaction ka;
 170         siginfo_t info;
 171         int signr;
 172
 173         /*
 174          * We want the common case to go fast, which is why we may in certain
 175          * cases get here from kernel mode. Just return without doing anything
 176          * if so.
 177          */
 178         if (!user_mode(regs))
 179                 return 1;
 180
 181         if (try_to_freeze(0))
 182                 goto no_signal;
 183
 184         if (!oldset)
 185                 oldset = &current->blocked;
 186
 187         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 188         if (signr > 0) {
 189                 handle_signal(signr, &info, &ka, oldset, regs);
 190                 return 1;
 191         }
 192
 193 no_signal:
 194         /*
 195          * Who's code doesn't conform to the restartable syscall convention
 196          * dies here!!!  The li instruction, a single machine instruction,
 197          * must directly be followed by the syscall instruction.
 198          */
 199         if (regs->regs[0]) {
 200                 if (regs->regs[2] == ERESTARTNOHAND ||
 201                     regs->regs[2] == ERESTARTSYS ||
 202                     regs->regs[2] == ERESTARTNOINTR) {
 203                         regs->cp0_epc -= 8;
 204                 }
 205         }
 206         return 0;
 207 }
 208
 209 asmlinkage void
 210 irix_sigreturn(struct pt_regs *regs)
 211 {
 212         struct sigctx_irix5 *context, *magic;
 213         unsigned long umask, mask;
 214         u64 *fregs;
 215         int sig, i, base = 0;
 216         sigset_t blocked;
 217
 218         /* Always make any pending restarted system calls return -EINTR */
 219         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 220
 221         if (regs->regs[2] == 1000)
 222                 base = 1;
 223
 224         context = (struct sigctx_irix5 *) regs->regs[base + 4];
 225         magic = (struct sigctx_irix5 *) regs->regs[base + 5];
 226         sig = (int) regs->regs[base + 6];
 227 #ifdef DEBUG_SIG
 228         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 229                current->comm, current->pid, context, magic, sig);
 230 #endif
 231         if (!context)
 232                 context = magic;
 233         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 234                 goto badframe;
 235
 236 #ifdef DEBUG_SIG
 237         dump_irix5_sigctx(context);
 238 #endif
 239
 240         __get_user(regs->cp0_epc, &context->pc);
 241         umask = context->rmask; mask = 2;
 242         for (i = 1; i < 32; i++, mask <<= 1) {
 243                 if(umask & mask)
 244                         __get_user(regs->regs[i], &context->regs[i]);
 245         }
 246         __get_user(regs->hi, &context->hi);
 247         __get_user(regs->lo, &context->lo);
 248
 249         if ((umask & 1) && context->usedfp) {
 250                 fregs = (u64 *) &current->thread.fpu;
 251                 for(i = 0; i < 32; i++)
 252                         fregs[i] = (u64) context->fpregs[i];
 253                 __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
 254         }
 255
 256         /* XXX do sigstack crapola here... XXX */
 257
 258         if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
 259                 goto badframe;
 260
 261         sigdelsetmask(&blocked, ~_BLOCKABLE);
 262         spin_lock_irq(&current->sighand->siglock);
 263         current->blocked = blocked;
 264         recalc_sigpending();
 265         spin_unlock_irq(&current->sighand->siglock);
 266
 267         /*
 268          * Don't let your children do this ...
 269          */
 270         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
 271                 do_syscall_trace(regs, 1);
 272         __asm__ __volatile__(
 273                 "move\t$29,%0\n\t"
 274                 "j\tsyscall_exit"
 275                 :/* no outputs */
 276                 :"r" (&regs));
 277                 /* Unreached */
 278
 279 badframe:
 280         force_sig(SIGSEGV, current);
 281 }
 282
 283 struct sigact_irix5 {
 284         int flags;
 285         void (*handler)(int);
 286         u32 sigset[4];
 287         int _unused0[2];
 288 };
 289
 290 #ifdef DEBUG_SIG
 291 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 292 {
 293         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 294                (unsigned long) p->handler,
 295                (unsigned long) p->sigset[0]);
 296 }
 297 #endif
 298
 299 asmlinkage int
 300 irix_sigaction(int sig, const struct sigaction *act,
 301               struct sigaction *oact, void *trampoline)
 302 {
 303         struct k_sigaction new_ka, old_ka;
 304         int ret;
 305
 306 #ifdef DEBUG_SIG
 307         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 308                (!old ? "0" : "OLD"), trampoline);
 309         if(new) {
 310                 dump_sigact_irix5(new); printk(" ");
 311         }
 312 #endif
 313         if (act) {
 314                 sigset_t mask;
 315                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 316                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 317                     __get_user(new_ka.sa.sa_flags, &act->sa_flags))
 318                         return -EFAULT;
 319
 320                 __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t));
 321
 322                 /*
 323                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 324                  * value for all invocations of sigaction.  Will have to
 325                  * investigate.  POSIX POSIX, die die die...
 326                  */
 327                 new_ka.sa_restorer = trampoline;
 328         }
 329
 330 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 331         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 332
 333         if (!ret && oact) {
 334                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 335                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 336                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
 337                         return -EFAULT;
 338                 __copy_to_user(&old_ka.sa.sa_mask, &oact->sa_mask,
 339                                sizeof(sigset_t));
 340         }
 341
 342         return ret;
 343 }
 344
 345 asmlinkage int irix_sigpending(irix_sigset_t *set)
 346 {
 347         return do_sigpending(set, sizeof(*set));
 348 }
 349
 350 asmlinkage int irix_sigprocmask(int how, irix_sigset_t *new, irix_sigset_t *old)
 351 {
 352         sigset_t oldbits, newbits;
 353         int error;
 354
 355         if (new) {
 356                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 357                 if (error)
 358                         return error;
 359                 __copy_from_user(&newbits, new, sizeof(unsigned long)*4);
 360                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 361
 362                 spin_lock_irq(&current->sighand->siglock);
 363                 oldbits = current->blocked;
 364
 365                 switch(how) {
 366                 case 1:
 367                         sigorsets(&newbits, &oldbits, &newbits);
 368                         break;
 369
 370                 case 2:
 371                         sigandsets(&newbits, &oldbits, &newbits);
 372                         break;
 373
 374                 case 3:
 375                         break;
 376
 377                 case 256:
 378                         siginitset(&newbits, newbits.sig[0]);
 379                         break;
 380
 381                 default:
 382                         return -EINVAL;
 383                 }
 384                 recalc_sigpending();
 385                 spin_unlock_irq(&current->sighand->siglock);
 386         }
 387         if(old) {
 388                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 389                 if(error)
 390                         return error;
 391                 __copy_to_user(old, &current->blocked, sizeof(unsigned long)*4);
 392         }
 393
 394         return 0;
 395 }
 396
 397 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 398 {
 399         sigset_t *uset, saveset, newset;
 400
 401         uset = (sigset_t *) regs->regs[4];
 402         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 403                 return -EFAULT;
 404         sigdelsetmask(&newset, ~_BLOCKABLE);
 405
 406         spin_lock_irq(&current->sighand->siglock);
 407         saveset = current->blocked;
 408         current->blocked = newset;
 409         recalc_sigpending();
 410         spin_unlock_irq(&current->sighand->siglock);
 411
 412         regs->regs[2] = -EINTR;
 413         while (1) {
 414                 current->state = TASK_INTERRUPTIBLE;
 415                 schedule();
 416                 if (do_irix_signal(&saveset, regs))
 417                         return -EINTR;
 418         }
 419 }
 420
 421 /* hate hate hate... */
 422 struct irix5_siginfo {
 423         int sig, code, error;
 424         union {
 425                 char unused[128 - (3 * 4)]; /* Safety net. */
 426                 struct {
 427                         int pid;
 428                         union {
 429                                 int uid;
 430                                 struct {
 431                                         int utime, status, stime;
 432                                 } child;
 433                         } procdata;
 434                 } procinfo;
 435
 436                 unsigned long fault_addr;
 437
 438                 struct {
 439                         int fd;
 440                         long band;
 441                 } fileinfo;
 442
 443                 unsigned long sigval;
 444         } stuff;
 445 };
 446
 447 static inline unsigned long timespectojiffies(struct timespec *value)
 448 {
 449         unsigned long sec = (unsigned) value->tv_sec;
 450         long nsec = value->tv_nsec;
 451
 452         if (sec > (LONG_MAX / HZ))
 453                 return LONG_MAX;
 454         nsec += 1000000000L / HZ - 1;
 455         nsec /= 1000000000L / HZ;
 456         return HZ * sec + nsec;
 457 }
 458
 459 asmlinkage int irix_sigpoll_sys(unsigned long *set, struct irix5_siginfo *info,
 460                                 struct timespec *tp)
 461 {
 462         long expire = MAX_SCHEDULE_TIMEOUT;
 463         sigset_t kset;
 464         int i, sig, error, timeo = 0;
 465
 466 #ifdef DEBUG_SIG
 467         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 468                current->comm, current->pid, set, info, tp);
 469 #endif
 470
 471         /* Must always specify the signal set. */
 472         if(!set)
 473                 return -EINVAL;
 474
 475         error = verify_area(VERIFY_READ, set, sizeof(kset));
 476         if (error)
 477                 goto out;
 478
 479         __copy_from_user(&kset, set, sizeof(set));
 480         if (error)
 481                 goto out;
 482
 483         if (info && clear_user(info, sizeof(*info))) {
 484                 error = -EFAULT;
 485                 goto out;
 486         }
 487
 488         if(tp) {
 489                 error = verify_area(VERIFY_READ, tp, sizeof(*tp));
 490                 if(error)
 491                         return error;
 492                 if(!tp->tv_sec && !tp->tv_nsec) {
 493                         error = -EINVAL;
 494                         goto out;
 495                 }
 496                 expire = timespectojiffies(tp)+(tp->tv_sec||tp->tv_nsec);
 497         }
 498
 499         while(1) {
 500                 long tmp = 0;
 501
 502                 current->state = TASK_INTERRUPTIBLE;
 503                 expire = schedule_timeout(expire);
 504
 505                 for (i=0; i<=4; i++)
 506                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 507
 508                 if (tmp)
 509                         break;
 510                 if (!expire) {
 511                         timeo = 1;
 512                         break;
 513                 }
 514                 if (signal_pending(current))
 515                         return -EINTR;
 516         }
 517         if (timeo)
 518                 return -EAGAIN;
 519
 520         for(sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 521                 if (sigismember (&kset, sig))
 522                         continue;
 523                 if (sigismember (&current->pending.signal, sig)) {
 524                         /* XXX need more than this... */
 525                         if (info)
 526                                 info->sig = sig;
 527                         error = 0;
 528                         goto out;
 529                 }
 530         }
 531
 532         /* Should not get here, but do something sane if we do. */
 533         error = -EINTR;
 534
 535 out:
 536         return error;
 537 }
 538
 539 /* This is here because of irix5_siginfo definition. */
 540 #define IRIX_P_PID    0
 541 #define IRIX_P_PGID   2
 542 #define IRIX_P_ALL    7
 543
 544 extern int getrusage(struct task_struct *, int, struct rusage __user *);
 545
 546 #define W_EXITED     1
 547 #define W_TRAPPED    2
 548 #define W_STOPPED    4
 549 #define W_CONT       8
 550 #define W_NOHANG    64
 551
 552 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 553
 554 asmlinkage int irix_waitsys(int type, int pid, struct irix5_siginfo *info,
 555                             int options, struct rusage *ru)
 556 {
 557         int flag, retval;
 558         DECLARE_WAITQUEUE(wait, current);
 559         struct task_struct *tsk;
 560         struct task_struct *p;
 561         struct list_head *_p;
 562
 563         if (!info) {
 564                 retval = -EINVAL;
 565                 goto out;
 566         }
 567         retval = verify_area(VERIFY_WRITE, info, sizeof(*info));
 568         if(retval)
 569                 goto out;
 570         if (ru) {
 571                 retval = verify_area(VERIFY_WRITE, ru, sizeof(*ru));
 572                 if(retval)
 573                         goto out;
 574         }
 575         if (options & ~(W_MASK)) {
 576                 retval = -EINVAL;
 577                 goto out;
 578         }
 579         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL) {
 580                 retval = -EINVAL;
 581                 goto out;
 582         }
 583         add_wait_queue(&current->signal->wait_chldexit, &wait);
 584 repeat:
 585         flag = 0;
 586         current->state = TASK_INTERRUPTIBLE;
 587         read_lock(&tasklist_lock);
 588         tsk = current;
 589         list_for_each(_p,&tsk->children) {
 590                 p = list_entry(_p,struct task_struct,sibling);
 591                 if ((type == IRIX_P_PID) && p->pid != pid)
 592                         continue;
 593                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 594                         continue;
 595                 if ((p->exit_signal != SIGCHLD))
 596                         continue;
 597                 flag = 1;
 598                 switch (p->state) {
 599                 case TASK_STOPPED:
 600                         if (!p->exit_code)
 601                                 continue;
 602                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 603                             !(p->ptrace & PT_PTRACED))
 604                                 continue;
 605                         read_unlock(&tasklist_lock);
 606
 607                         /* move to end of parent's list to avoid starvation */
 608                         write_lock_irq(&tasklist_lock);
 609                         remove_parent(p);
 610                         add_parent(p, p->parent);
 611                         write_unlock_irq(&tasklist_lock);
 612                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 613                         if (!retval && ru) {
 614                                 retval |= __put_user(SIGCHLD, &info->sig);
 615                                 retval |= __put_user(0, &info->code);
 616                                 retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 617                                 retval |= __put_user((p->exit_code >> 8) & 0xff,
 618                                            &info->stuff.procinfo.procdata.child.status);
 619                                 retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 620                                 retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 621                         }
 622                         if (!retval) {
 623                                 p->exit_code = 0;
 624                         }
 625                         goto end_waitsys;
 626
 627                 case EXIT_ZOMBIE:
 628                         current->signal->cutime += p->utime + p->signal->cutime;
 629                         current->signal->cstime += p->stime + p->signal->cstime;
 630                         if (ru != NULL)
 631                                 getrusage(p, RUSAGE_BOTH, ru);
 632                         __put_user(SIGCHLD, &info->sig);
 633                         __put_user(1, &info->code);      /* CLD_EXITED */
 634                         __put_user(p->pid, &info->stuff.procinfo.pid);
 635                         __put_user((p->exit_code >> 8) & 0xff,
 636                                    &info->stuff.procinfo.procdata.child.status);
 637                         __put_user(p->utime,
 638                                    &info->stuff.procinfo.procdata.child.utime);
 639                         __put_user(p->stime,
 640                                    &info->stuff.procinfo.procdata.child.stime);
 641                         retval = 0;
 642                         if (p->real_parent != p->parent) {
 643                                 write_lock_irq(&tasklist_lock);
 644                                 remove_parent(p);
 645                                 p->parent = p->real_parent;
 646                                 add_parent(p, p->parent);
 647                                 do_notify_parent(p, SIGCHLD);
 648                                 write_unlock_irq(&tasklist_lock);
 649                         } else
 650                                 release_task(p);
 651                         goto end_waitsys;
 652                 default:
 653                         continue;
 654                 }
 655                 tsk = next_thread(tsk);
 656         }
 657         read_unlock(&tasklist_lock);
 658         if (flag) {
 659                 retval = 0;
 660                 if (options & W_NOHANG)
 661                         goto end_waitsys;
 662                 retval = -ERESTARTSYS;
 663                 if (signal_pending(current))
 664                         goto end_waitsys;
 665                 current->state = TASK_INTERRUPTIBLE;
 666                 schedule();
 667                 goto repeat;
 668         }
 669         retval = -ECHILD;
 670 end_waitsys:
 671         current->state = TASK_RUNNING;
 672         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 673
 674 out:
 675         return retval;
 676 }
 677
 678 struct irix5_context {
 679         u32 flags;
 680         u32 link;
 681         u32 sigmask[4];
 682         struct { u32 sp, size, flags; } stack;
 683         int regs[36];
 684         u32 fpregs[32];
 685         u32 fpcsr;
 686         u32 _unused0;
 687         u32 _unused1[47];
 688         u32 weird_graphics_thing;
 689 };
 690
 691 asmlinkage int irix_getcontext(struct pt_regs *regs)
 692 {
 693         int error, i, base = 0;
 694         struct irix5_context *ctx;
 695         unsigned long flags;
 696
 697         if (regs->regs[2] == 1000)
 698                 base = 1;
 699         ctx = (struct irix5_context *) regs->regs[base + 4];
 700
 701 #ifdef DEBUG_SIG
 702         printk("[%s:%d] irix_getcontext(%p)\n",
 703                current->comm, current->pid, ctx);
 704 #endif
 705
 706         error = verify_area(VERIFY_WRITE, ctx, sizeof(*ctx));
 707         if(error)
 708                 goto out;
 709         __put_user(current->thread.irix_oldctx, &ctx->link);
 710
 711         __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t));
 712
 713         /* XXX Do sigstack stuff someday... */
 714         __put_user(0, &ctx->stack.sp);
 715         __put_user(0, &ctx->stack.size);
 716         __put_user(0, &ctx->stack.flags);
 717
 718         __put_user(0, &ctx->weird_graphics_thing);
 719         __put_user(0, &ctx->regs[0]);
 720         for (i = 1; i < 32; i++)
 721                 __put_user(regs->regs[i], &ctx->regs[i]);
 722         __put_user(regs->lo, &ctx->regs[32]);
 723         __put_user(regs->hi, &ctx->regs[33]);
 724         __put_user(regs->cp0_cause, &ctx->regs[34]);
 725         __put_user(regs->cp0_epc, &ctx->regs[35]);
 726
 727         flags = 0x0f;
 728         if(!used_math()) {
 729                 flags &= ~(0x08);
 730         } else {
 731                 /* XXX wheee... */
 732                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 733         }
 734         __put_user(flags, &ctx->flags);
 735         error = 0;
 736
 737 out:
 738         return error;
 739 }
 740
 741 asmlinkage unsigned long irix_setcontext(struct pt_regs *regs)
 742 {
 743         int error, base = 0;
 744         struct irix5_context *ctx;
 745
 746         if(regs->regs[2] == 1000)
 747                 base = 1;
 748         ctx = (struct irix5_context *) regs->regs[base + 4];
 749
 750 #ifdef DEBUG_SIG
 751         printk("[%s:%d] irix_setcontext(%p)\n",
 752                current->comm, current->pid, ctx);
 753 #endif
 754
 755         error = verify_area(VERIFY_READ, ctx, sizeof(*ctx));
 756         if (error)
 757                 goto out;
 758
 759         if (ctx->flags & 0x02) {
 760                 /* XXX sigstack garbage, todo... */
 761                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 762         }
 763
 764         if (ctx->flags & 0x04) {
 765                 int i;
 766
 767                 /* XXX extra control block stuff... todo... */
 768                 for(i = 1; i < 32; i++)
 769                         regs->regs[i] = ctx->regs[i];
 770                 regs->lo = ctx->regs[32];
 771                 regs->hi = ctx->regs[33];
 772                 regs->cp0_epc = ctx->regs[35];
 773         }
 774
 775         if (ctx->flags & 0x08) {
 776                 /* XXX fpu context, blah... */
 777                 printk("Wheee, cannot restore FPU context yet...\n");
 778         }
 779         current->thread.irix_oldctx = ctx->link;
 780         error = regs->regs[2];
 781
 782 out:
 783         return error;
 784 }
 785
 786 struct irix_sigstack { unsigned long sp; int status; };
 787
 788 asmlinkage int irix_sigstack(struct irix_sigstack *new, struct irix_sigstack *old)
 789 {
 790         int error;
 791
 792 #ifdef DEBUG_SIG
 793         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 794                current->comm, current->pid, new, old);
 795 #endif
 796         if(new) {
 797                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 798                 if(error)
 799                         goto out;
 800         }
 801
 802         if(old) {
 803                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 804                 if(error)
 805                         goto out;
 806         }
 807         error = 0;
 808
 809 out:
 810         return error;
 811 }
 812
 813 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 814
 815 asmlinkage int irix_sigaltstack(struct irix_sigaltstack *new,
 816                                 struct irix_sigaltstack *old)
 817 {
 818         int error;
 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                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 826                 if(error)
 827                         goto out;
 828         }
 829
 830         if (old) {
 831                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 832                 if(error)
 833                         goto out;
 834         }
 835         error = 0;
 836
 837 out:
 838         error = 0;
 839
 840         return error;
 841 }
 842
 843 struct irix_procset {
 844         int cmd, ltype, lid, rtype, rid;
 845 };
 846
 847 asmlinkage int irix_sigsendset(struct irix_procset *pset, int sig)
 848 {
 849         int error;
 850
 851         error = verify_area(VERIFY_READ, pset, sizeof(*pset));
 852         if(error)
 853                 goto out;
 854 #ifdef DEBUG_SIG
 855         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 856                current->comm, current->pid,
 857                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 858                sig);
 859 #endif
 860         error = -EINVAL;
 861
 862 out:
 863         return error;
 864 }