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/suspend.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 void setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  81                              int signr, sigset_t *oldmask)
  82 {
  83         unsigned long sp;
  84         struct sigctx_irix5 *ctx;
  85         int i;
  86
  87         sp = regs->regs[29];
  88         sp -= sizeof(struct sigctx_irix5);
  89         sp &= ~(0xf);
  90         ctx = (struct sigctx_irix5 *) sp;
  91         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  92                 goto segv_and_exit;
  93
  94         __put_user(0, &ctx->weird_fpu_thing);
  95         __put_user(~(0x00000001), &ctx->rmask);
  96         __put_user(0, &ctx->regs[0]);
  97         for(i = 1; i < 32; i++)
  98                 __put_user((u64) regs->regs[i], &ctx->regs[i]);
  99
 100         __put_user((u64) regs->hi, &ctx->hi);
 101         __put_user((u64) regs->lo, &ctx->lo);
 102         __put_user((u64) regs->cp0_epc, &ctx->pc);
 103         __put_user(current->used_math, &ctx->usedfp);
 104         __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 105         __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 106
 107         __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 108
 109         __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t));
 110
 111 #ifdef DEBUG_SIG
 112         dump_irix5_sigctx(ctx);
 113 #endif
 114
 115         regs->regs[4] = (unsigned long) signr;
 116         regs->regs[5] = 0; /* XXX sigcode XXX */
 117         regs->regs[6] = regs->regs[29] = sp;
 118         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 119         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 120
 121         return;
 122
 123 segv_and_exit:
 124         if (signr == SIGSEGV)
 125                 ka->sa.sa_handler = SIG_DFL;
 126         force_sig(SIGSEGV, current);
 127 }
 128
 129 static void inline
 130 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 131                int signr, sigset_t *oldmask, siginfo_t *info)
 132 {
 133         printk("Aiee: setup_tr_frame wants to be written");
 134         do_exit(SIGSEGV);
 135 }
 136
 137 static inline void handle_signal(unsigned long sig, siginfo_t *info,
 138         sigset_t *oldset, struct pt_regs * regs)
 139 {
 140         struct k_sigaction *ka = &current->sighand->action[sig-1];
 141
 142         switch(regs->regs[0]) {
 143         case ERESTARTNOHAND:
 144                 regs->regs[2] = EINTR;
 145                 break;
 146         case ERESTARTSYS:
 147                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 148                         regs->regs[2] = EINTR;
 149                         break;
 150                 }
 151         /* fallthrough */
 152         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 153                 regs->cp0_epc -= 8;
 154         }
 155
 156         regs->regs[0] = 0;              /* Don't deal with this again.  */
 157
 158         if (ka->sa.sa_flags & SA_SIGINFO)
 159                 setup_irix_rt_frame(ka, regs, sig, oldset, info);
 160         else
 161                 setup_irix_frame(ka, regs, sig, oldset);
 162
 163         if (ka->sa.sa_flags & SA_ONESHOT)
 164                 ka->sa.sa_handler = SIG_DFL;
 165         if (!(ka->sa.sa_flags & SA_NODEFER)) {
 166                 spin_lock_irq(&current->sighand->siglock);
 167                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 168                 sigaddset(&current->blocked,sig);
 169                 recalc_sigpending();
 170                 spin_unlock_irq(&current->sighand->siglock);
 171         }
 172 }
 173
 174 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 175 {
 176         siginfo_t info;
 177         int signr;
 178
 179         /*
 180          * We want the common case to go fast, which is why we may in certain
 181          * cases get here from kernel mode. Just return without doing anything
 182          * if so.
 183          */
 184         if (!user_mode(regs))
 185                 return 1;
 186
 187         if (current->flags & PF_FREEZE) {
 188                 refrigerator(0);
 189                 goto no_signal;
 190         }
 191
 192         if (!oldset)
 193                 oldset = &current->blocked;
 194
 195         signr = get_signal_to_deliver(&info, regs, NULL);
 196         if (signr > 0) {
 197                 handle_signal(signr, &info, oldset, regs);
 198                 return 1;
 199         }
 200
 201 no_signal:
 202         /*
 203          * Who's code doesn't conform to the restartable syscall convention
 204          * dies here!!!  The li instruction, a single machine instruction,
 205          * must directly be followed by the syscall instruction.
 206          */
 207         if (regs->regs[0]) {
 208                 if (regs->regs[2] == ERESTARTNOHAND ||
 209                     regs->regs[2] == ERESTARTSYS ||
 210                     regs->regs[2] == ERESTARTNOINTR) {
 211                         regs->cp0_epc -= 8;
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217 asmlinkage void
 218 irix_sigreturn(struct pt_regs *regs)
 219 {
 220         struct sigctx_irix5 *context, *magic;
 221         unsigned long umask, mask;
 222         u64 *fregs;
 223         int sig, i, base = 0;
 224         sigset_t blocked;
 225
 226         /* Always make any pending restarted system calls return -EINTR */
 227         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 228
 229         if (regs->regs[2] == 1000)
 230                 base = 1;
 231
 232         context = (struct sigctx_irix5 *) regs->regs[base + 4];
 233         magic = (struct sigctx_irix5 *) regs->regs[base + 5];
 234         sig = (int) regs->regs[base + 6];
 235 #ifdef DEBUG_SIG
 236         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 237                current->comm, current->pid, context, magic, sig);
 238 #endif
 239         if (!context)
 240                 context = magic;
 241         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 242                 goto badframe;
 243
 244 #ifdef DEBUG_SIG
 245         dump_irix5_sigctx(context);
 246 #endif
 247
 248         __get_user(regs->cp0_epc, &context->pc);
 249         umask = context->rmask; mask = 2;
 250         for (i = 1; i < 32; i++, mask <<= 1) {
 251                 if(umask & mask)
 252                         __get_user(regs->regs[i], &context->regs[i]);
 253         }
 254         __get_user(regs->hi, &context->hi);
 255         __get_user(regs->lo, &context->lo);
 256
 257         if ((umask & 1) && context->usedfp) {
 258                 fregs = (u64 *) &current->thread.fpu;
 259                 for(i = 0; i < 32; i++)
 260                         fregs[i] = (u64) context->fpregs[i];
 261                 __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
 262         }
 263
 264         /* XXX do sigstack crapola here... XXX */
 265
 266         if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
 267                 goto badframe;
 268
 269         sigdelsetmask(&blocked, ~_BLOCKABLE);
 270         spin_lock_irq(&current->sighand->siglock);
 271         current->blocked = blocked;
 272         recalc_sigpending();
 273         spin_unlock_irq(&current->sighand->siglock);
 274
 275         /*
 276          * Don't let your children do this ...
 277          */
 278         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
 279                 do_syscall_trace(regs, 1);
 280         __asm__ __volatile__(
 281                 "move\t$29,%0\n\t"
 282                 "j\tsyscall_exit"
 283                 :/* no outputs */
 284                 :"r" (&regs));
 285                 /* Unreached */
 286
 287 badframe:
 288         force_sig(SIGSEGV, current);
 289 }
 290
 291 struct sigact_irix5 {
 292         int flags;
 293         void (*handler)(int);
 294         u32 sigset[4];
 295         int _unused0[2];
 296 };
 297
 298 #ifdef DEBUG_SIG
 299 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 300 {
 301         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 302                (unsigned long) p->handler,
 303                (unsigned long) p->sigset[0]);
 304 }
 305 #endif
 306
 307 asmlinkage int
 308 irix_sigaction(int sig, const struct sigaction *act,
 309               struct sigaction *oact, void *trampoline)
 310 {
 311         struct k_sigaction new_ka, old_ka;
 312         int ret;
 313
 314 #ifdef DEBUG_SIG
 315         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 316                (!old ? "0" : "OLD"), trampoline);
 317         if(new) {
 318                 dump_sigact_irix5(new); printk(" ");
 319         }
 320 #endif
 321         if (act) {
 322                 sigset_t mask;
 323                 if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
 324                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 325                     __get_user(new_ka.sa.sa_flags, &act->sa_flags))
 326                         return -EFAULT;
 327
 328                 __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t));
 329
 330                 /*
 331                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 332                  * value for all invocations of sigaction.  Will have to
 333                  * investigate.  POSIX POSIX, die die die...
 334                  */
 335                 new_ka.sa_restorer = trampoline;
 336         }
 337
 338 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 339         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 340
 341         if (!ret && oact) {
 342                 if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
 343                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 344                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
 345                         return -EFAULT;
 346                 __copy_to_user(&old_ka.sa.sa_mask, &oact->sa_mask,
 347                                sizeof(sigset_t));
 348         }
 349
 350         return ret;
 351 }
 352
 353 asmlinkage int irix_sigpending(irix_sigset_t *set)
 354 {
 355         return do_sigpending(set, sizeof(*set));
 356 }
 357
 358 asmlinkage int irix_sigprocmask(int how, irix_sigset_t *new, irix_sigset_t *old)
 359 {
 360         sigset_t oldbits, newbits;
 361         int error;
 362
 363         if (new) {
 364                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 365                 if (error)
 366                         return error;
 367                 __copy_from_user(&newbits, new, sizeof(unsigned long)*4);
 368                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 369
 370                 spin_lock_irq(&current->sighand->siglock);
 371                 oldbits = current->blocked;
 372
 373                 switch(how) {
 374                 case 1:
 375                         sigorsets(&newbits, &oldbits, &newbits);
 376                         break;
 377
 378                 case 2:
 379                         sigandsets(&newbits, &oldbits, &newbits);
 380                         break;
 381
 382                 case 3:
 383                         break;
 384
 385                 case 256:
 386                         siginitset(&newbits, newbits.sig[0]);
 387                         break;
 388
 389                 default:
 390                         return -EINVAL;
 391                 }
 392                 recalc_sigpending();
 393                 spin_unlock_irq(&current->sighand->siglock);
 394         }
 395         if(old) {
 396                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 397                 if(error)
 398                         return error;
 399                 __copy_to_user(old, &current->blocked, sizeof(unsigned long)*4);
 400         }
 401
 402         return 0;
 403 }
 404
 405 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 406 {
 407         sigset_t *uset, saveset, newset;
 408
 409         uset = (sigset_t *) regs->regs[4];
 410         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 411                 return -EFAULT;
 412         sigdelsetmask(&newset, ~_BLOCKABLE);
 413
 414         spin_lock_irq(&current->sighand->siglock);
 415         saveset = current->blocked;
 416         current->blocked = newset;
 417         recalc_sigpending();
 418         spin_unlock_irq(&current->sighand->siglock);
 419
 420         regs->regs[2] = -EINTR;
 421         while (1) {
 422                 current->state = TASK_INTERRUPTIBLE;
 423                 schedule();
 424                 if (do_irix_signal(&saveset, regs))
 425                         return -EINTR;
 426         }
 427 }
 428
 429 /* hate hate hate... */
 430 struct irix5_siginfo {
 431         int sig, code, error;
 432         union {
 433                 char unused[128 - (3 * 4)]; /* Safety net. */
 434                 struct {
 435                         int pid;
 436                         union {
 437                                 int uid;
 438                                 struct {
 439                                         int utime, status, stime;
 440                                 } child;
 441                         } procdata;
 442                 } procinfo;
 443
 444                 unsigned long fault_addr;
 445
 446                 struct {
 447                         int fd;
 448                         long band;
 449                 } fileinfo;
 450
 451                 unsigned long sigval;
 452         } stuff;
 453 };
 454
 455 static inline unsigned long timespectojiffies(struct timespec *value)
 456 {
 457         unsigned long sec = (unsigned) value->tv_sec;
 458         long nsec = value->tv_nsec;
 459
 460         if (sec > (LONG_MAX / HZ))
 461                 return LONG_MAX;
 462         nsec += 1000000000L / HZ - 1;
 463         nsec /= 1000000000L / HZ;
 464         return HZ * sec + nsec;
 465 }
 466
 467 asmlinkage int irix_sigpoll_sys(unsigned long *set, struct irix5_siginfo *info,
 468                                 struct timespec *tp)
 469 {
 470         long expire = MAX_SCHEDULE_TIMEOUT;
 471         sigset_t kset;
 472         int i, sig, error, timeo = 0;
 473
 474 #ifdef DEBUG_SIG
 475         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 476                current->comm, current->pid, set, info, tp);
 477 #endif
 478
 479         /* Must always specify the signal set. */
 480         if(!set)
 481                 return -EINVAL;
 482
 483         error = verify_area(VERIFY_READ, set, sizeof(kset));
 484         if (error)
 485                 goto out;
 486
 487         __copy_from_user(&kset, set, sizeof(set));
 488         if (error)
 489                 goto out;
 490
 491         if (info && clear_user(info, sizeof(*info))) {
 492                 error = -EFAULT;
 493                 goto out;
 494         }
 495
 496         if(tp) {
 497                 error = verify_area(VERIFY_READ, tp, sizeof(*tp));
 498                 if(error)
 499                         return error;
 500                 if(!tp->tv_sec && !tp->tv_nsec) {
 501                         error = -EINVAL;
 502                         goto out;
 503                 }
 504                 expire = timespectojiffies(tp)+(tp->tv_sec||tp->tv_nsec);
 505         }
 506
 507         while(1) {
 508                 long tmp = 0;
 509
 510                 current->state = TASK_INTERRUPTIBLE;
 511                 expire = schedule_timeout(expire);
 512
 513                 for (i=0; i<=4; i++)
 514                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 515
 516                 if (tmp)
 517                         break;
 518                 if (!expire) {
 519                         timeo = 1;
 520                         break;
 521                 }
 522                 if (signal_pending(current))
 523                         return -EINTR;
 524         }
 525         if (timeo)
 526                 return -EAGAIN;
 527
 528         for(sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 529                 if (sigismember (&kset, sig))
 530                         continue;
 531                 if (sigismember (&current->pending.signal, sig)) {
 532                         /* XXX need more than this... */
 533                         if (info)
 534                                 info->sig = sig;
 535                         error = 0;
 536                         goto out;
 537                 }
 538         }
 539
 540         /* Should not get here, but do something sane if we do. */
 541         error = -EINTR;
 542
 543 out:
 544         return error;
 545 }
 546
 547 /* This is here because of irix5_siginfo definition. */
 548 #define P_PID    0
 549 #define P_PGID   2
 550 #define P_ALL    7
 551
 552 extern int getrusage(struct task_struct *, int, struct rusage __user *);
 553
 554 #define W_EXITED     1
 555 #define W_TRAPPED    2
 556 #define W_STOPPED    4
 557 #define W_CONT       8
 558 #define W_NOHANG    64
 559
 560 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 561
 562 asmlinkage int irix_waitsys(int type, int pid, struct irix5_siginfo *info,
 563                             int options, struct rusage *ru)
 564 {
 565         int flag, retval;
 566         DECLARE_WAITQUEUE(wait, current);
 567         struct task_struct *tsk;
 568         struct task_struct *p;
 569         struct list_head *_p;
 570
 571         if (!info) {
 572                 retval = -EINVAL;
 573                 goto out;
 574         }
 575         retval = verify_area(VERIFY_WRITE, info, sizeof(*info));
 576         if(retval)
 577                 goto out;
 578         if (ru) {
 579                 retval = verify_area(VERIFY_WRITE, ru, sizeof(*ru));
 580                 if(retval)
 581                         goto out;
 582         }
 583         if (options & ~(W_MASK)) {
 584                 retval = -EINVAL;
 585                 goto out;
 586         }
 587         if (type != P_PID && type != P_PGID && type != P_ALL) {
 588                 retval = -EINVAL;
 589                 goto out;
 590         }
 591         add_wait_queue(&current->wait_chldexit, &wait);
 592 repeat:
 593         flag = 0;
 594         current->state = TASK_INTERRUPTIBLE;
 595         read_lock(&tasklist_lock);
 596         tsk = current;
 597         list_for_each(_p,&tsk->children) {
 598                 p = list_entry(_p,struct task_struct,sibling);
 599                 if ((type == P_PID) && p->pid != pid)
 600                         continue;
 601                 if ((type == P_PGID) && process_group(p) != pid)
 602                         continue;
 603                 if ((p->exit_signal != SIGCHLD))
 604                         continue;
 605                 flag = 1;
 606                 switch (p->state) {
 607                 case TASK_STOPPED:
 608                         if (!p->exit_code)
 609                                 continue;
 610                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 611                             !(p->ptrace & PT_PTRACED))
 612                                 continue;
 613                         read_unlock(&tasklist_lock);
 614
 615                         /* move to end of parent's list to avoid starvation */
 616                         write_lock_irq(&tasklist_lock);
 617                         remove_parent(p);
 618                         add_parent(p, p->parent);
 619                         write_unlock_irq(&tasklist_lock);
 620                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 621                         if (!retval && ru) {
 622                                 retval |= __put_user(SIGCHLD, &info->sig);
 623                                 retval |= __put_user(0, &info->code);
 624                                 retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 625                                 retval |= __put_user((p->exit_code >> 8) & 0xff,
 626                                            &info->stuff.procinfo.procdata.child.status);
 627                                 retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 628                                 retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 629                         }
 630                         if (!retval) {
 631                                 p->exit_code = 0;
 632                         }
 633                         goto end_waitsys;
 634
 635                 case TASK_ZOMBIE:
 636                         current->cutime += p->utime + p->cutime;
 637                         current->cstime += p->stime + p->cstime;
 638                         if (ru != NULL)
 639                                 getrusage(p, RUSAGE_BOTH, ru);
 640                         __put_user(SIGCHLD, &info->sig);
 641                         __put_user(1, &info->code);      /* CLD_EXITED */
 642                         __put_user(p->pid, &info->stuff.procinfo.pid);
 643                         __put_user((p->exit_code >> 8) & 0xff,
 644                                    &info->stuff.procinfo.procdata.child.status);
 645                         __put_user(p->utime,
 646                                    &info->stuff.procinfo.procdata.child.utime);
 647                         __put_user(p->stime,
 648                                    &info->stuff.procinfo.procdata.child.stime);
 649                         retval = 0;
 650                         if (p->real_parent != p->parent) {
 651                                 write_lock_irq(&tasklist_lock);
 652                                 remove_parent(p);
 653                                 p->parent = p->real_parent;
 654                                 add_parent(p, p->parent);
 655                                 do_notify_parent(p, SIGCHLD);
 656                                 write_unlock_irq(&tasklist_lock);
 657                         } else
 658                                 release_task(p);
 659                         goto end_waitsys;
 660                 default:
 661                         continue;
 662                 }
 663                 tsk = next_thread(tsk);
 664         }
 665         read_unlock(&tasklist_lock);
 666         if (flag) {
 667                 retval = 0;
 668                 if (options & W_NOHANG)
 669                         goto end_waitsys;
 670                 retval = -ERESTARTSYS;
 671                 if (signal_pending(current))
 672                         goto end_waitsys;
 673                 current->state = TASK_INTERRUPTIBLE;
 674                 schedule();
 675                 goto repeat;
 676         }
 677         retval = -ECHILD;
 678 end_waitsys:
 679         current->state = TASK_RUNNING;
 680         remove_wait_queue(&current->wait_chldexit, &wait);
 681
 682 out:
 683         return retval;
 684 }
 685
 686 struct irix5_context {
 687         u32 flags;
 688         u32 link;
 689         u32 sigmask[4];
 690         struct { u32 sp, size, flags; } stack;
 691         int regs[36];
 692         u32 fpregs[32];
 693         u32 fpcsr;
 694         u32 _unused0;
 695         u32 _unused1[47];
 696         u32 weird_graphics_thing;
 697 };
 698
 699 asmlinkage int irix_getcontext(struct pt_regs *regs)
 700 {
 701         int error, i, base = 0;
 702         struct irix5_context *ctx;
 703         unsigned long flags;
 704
 705         if (regs->regs[2] == 1000)
 706                 base = 1;
 707         ctx = (struct irix5_context *) regs->regs[base + 4];
 708
 709 #ifdef DEBUG_SIG
 710         printk("[%s:%d] irix_getcontext(%p)\n",
 711                current->comm, current->pid, ctx);
 712 #endif
 713
 714         error = verify_area(VERIFY_WRITE, ctx, sizeof(*ctx));
 715         if(error)
 716                 goto out;
 717         __put_user(current->thread.irix_oldctx, &ctx->link);
 718
 719         __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t));
 720
 721         /* XXX Do sigstack stuff someday... */
 722         __put_user(0, &ctx->stack.sp);
 723         __put_user(0, &ctx->stack.size);
 724         __put_user(0, &ctx->stack.flags);
 725
 726         __put_user(0, &ctx->weird_graphics_thing);
 727         __put_user(0, &ctx->regs[0]);
 728         for (i = 1; i < 32; i++)
 729                 __put_user(regs->regs[i], &ctx->regs[i]);
 730         __put_user(regs->lo, &ctx->regs[32]);
 731         __put_user(regs->hi, &ctx->regs[33]);
 732         __put_user(regs->cp0_cause, &ctx->regs[34]);
 733         __put_user(regs->cp0_epc, &ctx->regs[35]);
 734
 735         flags = 0x0f;
 736         if(!current->used_math) {
 737                 flags &= ~(0x08);
 738         } else {
 739                 /* XXX wheee... */
 740                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 741         }
 742         __put_user(flags, &ctx->flags);
 743         error = 0;
 744
 745 out:
 746         return error;
 747 }
 748
 749 asmlinkage unsigned long irix_setcontext(struct pt_regs *regs)
 750 {
 751         int error, base = 0;
 752         struct irix5_context *ctx;
 753
 754         if(regs->regs[2] == 1000)
 755                 base = 1;
 756         ctx = (struct irix5_context *) regs->regs[base + 4];
 757
 758 #ifdef DEBUG_SIG
 759         printk("[%s:%d] irix_setcontext(%p)\n",
 760                current->comm, current->pid, ctx);
 761 #endif
 762
 763         error = verify_area(VERIFY_READ, ctx, sizeof(*ctx));
 764         if (error)
 765                 goto out;
 766
 767         if (ctx->flags & 0x02) {
 768                 /* XXX sigstack garbage, todo... */
 769                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 770         }
 771
 772         if (ctx->flags & 0x04) {
 773                 int i;
 774
 775                 /* XXX extra control block stuff... todo... */
 776                 for(i = 1; i < 32; i++)
 777                         regs->regs[i] = ctx->regs[i];
 778                 regs->lo = ctx->regs[32];
 779                 regs->hi = ctx->regs[33];
 780                 regs->cp0_epc = ctx->regs[35];
 781         }
 782
 783         if (ctx->flags & 0x08) {
 784                 /* XXX fpu context, blah... */
 785                 printk("Wheee, cannot restore FPU context yet...\n");
 786         }
 787         current->thread.irix_oldctx = ctx->link;
 788         error = regs->regs[2];
 789
 790 out:
 791         return error;
 792 }
 793
 794 struct irix_sigstack { unsigned long sp; int status; };
 795
 796 asmlinkage int irix_sigstack(struct irix_sigstack *new, struct irix_sigstack *old)
 797 {
 798         int error;
 799
 800 #ifdef DEBUG_SIG
 801         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 802                current->comm, current->pid, new, old);
 803 #endif
 804         if(new) {
 805                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 806                 if(error)
 807                         goto out;
 808         }
 809
 810         if(old) {
 811                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 812                 if(error)
 813                         goto out;
 814         }
 815         error = 0;
 816
 817 out:
 818         return error;
 819 }
 820
 821 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 822
 823 asmlinkage int irix_sigaltstack(struct irix_sigaltstack *new,
 824                                 struct irix_sigaltstack *old)
 825 {
 826         int error;
 827
 828 #ifdef DEBUG_SIG
 829         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 830                current->comm, current->pid, new, old);
 831 #endif
 832         if (new) {
 833                 error = verify_area(VERIFY_READ, new, sizeof(*new));
 834                 if(error)
 835                         goto out;
 836         }
 837
 838         if (old) {
 839                 error = verify_area(VERIFY_WRITE, old, sizeof(*old));
 840                 if(error)
 841                         goto out;
 842         }
 843         error = 0;
 844
 845 out:
 846         error = 0;
 847
 848         return error;
 849 }
 850
 851 struct irix_procset {
 852         int cmd, ltype, lid, rtype, rid;
 853 };
 854
 855 asmlinkage int irix_sigsendset(struct irix_procset *pset, int sig)
 856 {
 857         int error;
 858
 859         error = verify_area(VERIFY_READ, pset, sizeof(*pset));
 860         if(error)
 861                 goto out;
 862 #ifdef DEBUG_SIG
 863         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 864                current->comm, current->pid,
 865                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 866                sig);
 867 #endif
 868         error = -EINVAL;
 869
 870 out:
 871         return error;
 872 }