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