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