arch/mips/kernel/irixsig.c

   1 /*
   2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible or what?!?!
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/mm.h>
  11 #include <linux/errno.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/time.h>
  15 #include <linux/ptrace.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19
  20 #undef DEBUG_SIG
  21
  22 #define _S(nr) (1<<((nr)-1))
  23
  24 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  25
  26 typedef struct {
  27         unsigned long sig[4];
  28 } irix_sigset_t;
  29
  30 struct sigctx_irix5 {
  31         u32 rmask, cp0_status;
  32         u64 pc;
  33         u64 regs[32];
  34         u64 fpregs[32];
  35         u32 usedfp, fpcsr, fpeir, sstk_flags;
  36         u64 hi, lo;
  37         u64 cp0_cause, cp0_badvaddr, _unused0;
  38         irix_sigset_t sigset;
  39         u64 weird_fpu_thing;
  40         u64 _unused1[31];
  41 };
  42
  43 #ifdef DEBUG_SIG
  44 /* Debugging */
  45 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  46 {
  47         int i;
  48
  49         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  50                (unsigned long) c->rmask,
  51                (unsigned long) c->cp0_status,
  52                (unsigned long) c->pc);
  53         printk("regs: ");
  54         for(i = 0; i < 16; i++)
  55                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  56         printk("\nregs: ");
  57         for(i = 16; i < 32; i++)
  58                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  59         printk("\nfpregs: ");
  60         for(i = 0; i < 16; i++)
  61                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  62         printk("\nfpregs: ");
  63         for(i = 16; i < 32; i++)
  64                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  65         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  66                (int) c->usedfp, (unsigned long) c->fpcsr,
  67                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  68         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  69                (unsigned long) c->hi, (unsigned long) c->lo,
  70                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  71         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  72                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  73                (unsigned long) c->sigset.sig[1],
  74                (unsigned long) c->sigset.sig[2],
  75                (unsigned long) c->sigset.sig[3]);
  76 }
  77 #endif
  78
  79 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  80                             int signr, sigset_t *oldmask)
  81 {
  82         struct sigctx_irix5 __user *ctx;
  83         unsigned long sp;
  84         int error, i;
  85
  86         sp = regs->regs[29];
  87         sp -= sizeof(struct sigctx_irix5);
  88         sp &= ~(0xf);
  89         ctx = (struct sigctx_irix5 __user *) sp;
  90         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  91                 goto segv_and_exit;
  92
  93         error = __put_user(0, &ctx->weird_fpu_thing);
  94         error |= __put_user(~(0x00000001), &ctx->rmask);
  95         error |= __put_user(0, &ctx->regs[0]);
  96         for(i = 1; i < 32; i++)
  97                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
  98
  99         error |= __put_user((u64) regs->hi, &ctx->hi);
 100         error |= __put_user((u64) regs->lo, &ctx->lo);
 101         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 102         error |= __put_user(!!used_math(), &ctx->usedfp);
 103         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 104         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 105
 106         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 107
 108         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 109
 110         if (error)
 111                 goto segv_and_exit;
 112
 113 #ifdef DEBUG_SIG
 114         dump_irix5_sigctx(ctx);
 115 #endif
 116
 117         regs->regs[4] = (unsigned long) signr;
 118         regs->regs[5] = 0; /* XXX sigcode XXX */
 119         regs->regs[6] = regs->regs[29] = sp;
 120         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 121         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 122
 123         return 1;
 124
 125 segv_and_exit:
 126         force_sigsegv(signr, current);
 127         return 0;
 128 }
 129
 130 static int inline
 131 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 132                int signr, sigset_t *oldmask, siginfo_t *info)
 133 {
 134         printk("Aiee: setup_tr_frame wants to be written");
 135         do_exit(SIGSEGV);
 136 }
 137
 138 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 139         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 140 {
 141         int ret;
 142
 143         switch(regs->regs[0]) {
 144         case ERESTARTNOHAND:
 145                 regs->regs[2] = EINTR;
 146                 break;
 147         case ERESTARTSYS:
 148                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 149                         regs->regs[2] = EINTR;
 150                         break;
 151                 }
 152         /* fallthrough */
 153         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 154                 regs->cp0_epc -= 8;
 155         }
 156
 157         regs->regs[0] = 0;              /* Don't deal with this again.  */
 158
 159         if (ka->sa.sa_flags & SA_SIGINFO)
 160                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 161         else
 162                 ret = setup_irix_frame(ka, regs, sig, oldset);
 163
 164         spin_lock_irq(&current->sighand->siglock);
 165         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 166         if (!(ka->sa.sa_flags & SA_NODEFER))
 167                 sigaddset(&current->blocked,sig);
 168         recalc_sigpending();
 169         spin_unlock_irq(&current->sighand->siglock);
 170
 171         return ret;
 172 }
 173
 174 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 175 {
 176         struct k_sigaction ka;
 177         siginfo_t info;
 178         int signr;
 179
 180         /*
 181          * We want the common case to go fast, which is why we may in certain
 182          * cases get here from kernel mode. Just return without doing anything
 183          * if so.
 184          */
 185         if (!user_mode(regs))
 186                 return 1;
 187
 188         if (try_to_freeze())
 189                 goto no_signal;
 190
 191         if (!oldset)
 192                 oldset = &current->blocked;
 193
 194         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 195         if (signr > 0)
 196                 return handle_signal(signr, &info, &ka, oldset, regs);
 197
 198 no_signal:
 199         /*
 200          * Who's code doesn't conform to the restartable syscall convention
 201          * dies here!!!  The li instruction, a single machine instruction,
 202          * must directly be followed by the syscall instruction.
 203          */
 204         if (regs->regs[0]) {
 205                 if (regs->regs[2] == ERESTARTNOHAND ||
 206                     regs->regs[2] == ERESTARTSYS ||
 207                     regs->regs[2] == ERESTARTNOINTR) {
 208                         regs->cp0_epc -= 8;
 209                 }
 210         }
 211         return 0;
 212 }
 213
 214 asmlinkage void
 215 irix_sigreturn(struct pt_regs *regs)
 216 {
 217         struct sigctx_irix5 __user *context, *magic;
 218         unsigned long umask, mask;
 219         u64 *fregs;
 220         u32 usedfp;
 221         int error, 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 __user *) regs->regs[base + 4];
 231         magic = (struct sigctx_irix5 __user *) 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         error = __get_user(regs->cp0_epc, &context->pc);
 247         error |= __get_user(umask, &context->rmask);
 248
 249         mask = 2;
 250         for (i = 1; i < 32; i++, mask <<= 1) {
 251                 if (umask & mask)
 252                         error |= __get_user(regs->regs[i], &context->regs[i]);
 253         }
 254         error |= __get_user(regs->hi, &context->hi);
 255         error |= __get_user(regs->lo, &context->lo);
 256
 257         error |= __get_user(usedfp, &context->usedfp);
 258         if ((umask & 1) && usedfp) {
 259                 fregs = (u64 *) &current->thread.fpu;
 260
 261                 for(i = 0; i < 32; i++)
 262                         error |= __get_user(fregs[i], &context->fpregs[i]);
 263                 error |= __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
 264         }
 265
 266         /* XXX do sigstack crapola here... XXX */
 267
 268         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 269
 270         if (error)
 271                 goto badframe;
 272
 273         sigdelsetmask(&blocked, ~_BLOCKABLE);
 274         spin_lock_irq(&current->sighand->siglock);
 275         current->blocked = blocked;
 276         recalc_sigpending();
 277         spin_unlock_irq(&current->sighand->siglock);
 278
 279         /*
 280          * Don't let your children do this ...
 281          */
 282         __asm__ __volatile__(
 283                 "move\t$29,%0\n\t"
 284                 "j\tsyscall_exit"
 285                 :/* no outputs */
 286                 :"r" (&regs));
 287                 /* Unreached */
 288
 289 badframe:
 290         force_sig(SIGSEGV, current);
 291 }
 292
 293 struct sigact_irix5 {
 294         int flags;
 295         void (*handler)(int);
 296         u32 sigset[4];
 297         int _unused0[2];
 298 };
 299
 300 #ifdef DEBUG_SIG
 301 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 302 {
 303         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 304                (unsigned long) p->handler,
 305                (unsigned long) p->sigset[0]);
 306 }
 307 #endif
 308
 309 asmlinkage int
 310 irix_sigaction(int sig, const struct sigaction __user *act,
 311               struct sigaction __user *oact, void __user *trampoline)
 312 {
 313         struct k_sigaction new_ka, old_ka;
 314         int ret;
 315
 316 #ifdef DEBUG_SIG
 317         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 318                (!old ? "0" : "OLD"), trampoline);
 319         if(new) {
 320                 dump_sigact_irix5(new); printk(" ");
 321         }
 322 #endif
 323         if (act) {
 324                 sigset_t mask;
 325                 int err;
 326
 327                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 328                         return -EFAULT;
 329                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 330                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 331
 332                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 333                 if (err)
 334                         return err;
 335
 336                 /*
 337                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 338                  * value for all invocations of sigaction.  Will have to
 339                  * investigate.  POSIX POSIX, die die die...
 340                  */
 341                 new_ka.sa_restorer = trampoline;
 342         }
 343
 344 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 345         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 346
 347         if (!ret && oact) {
 348                 int err;
 349
 350                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 351                         return -EFAULT;
 352
 353                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 354                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 355                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 356                                sizeof(sigset_t)) ? -EFAULT : 0;
 357                 if (err)
 358                         return -EFAULT;
 359         }
 360
 361         return ret;
 362 }
 363
 364 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 365 {
 366         return do_sigpending(set, sizeof(*set));
 367 }
 368
 369 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 370         irix_sigset_t __user *old)
 371 {
 372         sigset_t oldbits, newbits;
 373
 374         if (new) {
 375                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 376                         return -EFAULT;
 377                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 378                         return -EFAULT;
 379                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 380
 381                 spin_lock_irq(&current->sighand->siglock);
 382                 oldbits = current->blocked;
 383
 384                 switch(how) {
 385                 case 1:
 386                         sigorsets(&newbits, &oldbits, &newbits);
 387                         break;
 388
 389                 case 2:
 390                         sigandsets(&newbits, &oldbits, &newbits);
 391                         break;
 392
 393                 case 3:
 394                         break;
 395
 396                 case 256:
 397                         siginitset(&newbits, newbits.sig[0]);
 398                         break;
 399
 400                 default:
 401                         return -EINVAL;
 402                 }
 403                 recalc_sigpending();
 404                 spin_unlock_irq(&current->sighand->siglock);
 405         }
 406         if (old)
 407                 return copy_to_user(old, &current->blocked,
 408                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 409
 410         return 0;
 411 }
 412
 413 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 414 {
 415         sigset_t saveset, newset;
 416         sigset_t __user *uset;
 417
 418         uset = (sigset_t __user *) regs->regs[4];
 419         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 420                 return -EFAULT;
 421         sigdelsetmask(&newset, ~_BLOCKABLE);
 422
 423         spin_lock_irq(&current->sighand->siglock);
 424         saveset = current->blocked;
 425         current->blocked = newset;
 426         recalc_sigpending();
 427         spin_unlock_irq(&current->sighand->siglock);
 428
 429         regs->regs[2] = -EINTR;
 430         while (1) {
 431                 current->state = TASK_INTERRUPTIBLE;
 432                 schedule();
 433                 if (do_irix_signal(&saveset, regs))
 434                         return -EINTR;
 435         }
 436 }
 437
 438 /* hate hate hate... */
 439 struct irix5_siginfo {
 440         int sig, code, error;
 441         union {
 442                 char unused[128 - (3 * 4)]; /* Safety net. */
 443                 struct {
 444                         int pid;
 445                         union {
 446                                 int uid;
 447                                 struct {
 448                                         int utime, status, stime;
 449                                 } child;
 450                         } procdata;
 451                 } procinfo;
 452
 453                 unsigned long fault_addr;
 454
 455                 struct {
 456                         int fd;
 457                         long band;
 458                 } fileinfo;
 459
 460                 unsigned long sigval;
 461         } stuff;
 462 };
 463
 464 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 465         struct irix5_siginfo __user *info, struct timespec __user *tp)
 466 {
 467         long expire = MAX_SCHEDULE_TIMEOUT;
 468         sigset_t kset;
 469         int i, sig, error, timeo = 0;
 470         struct timespec ktp;
 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         if (copy_from_user(&kset, set, sizeof(set)))
 482                 return -EFAULT;
 483
 484         if (info && clear_user(info, sizeof(*info))) {
 485                 error = -EFAULT;
 486                 goto out;
 487         }
 488
 489         if (tp) {
 490                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 491                         return -EFAULT;
 492
 493                 if (!ktp.tv_sec && !ktp.tv_nsec)
 494                         return -EINVAL;
 495
 496                 expire = timespec_to_jiffies(&ktp) +
 497                          (ktp.tv_sec || ktp.tv_nsec);
 498         }
 499
 500         while(1) {
 501                 long tmp = 0;
 502
 503                 expire = schedule_timeout_interruptible(expire);
 504
 505                 for (i=0; i<=4; i++)
 506                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 507
 508                 if (tmp)
 509                         break;
 510                 if (!expire) {
 511                         timeo = 1;
 512                         break;
 513                 }
 514                 if (signal_pending(current))
 515                         return -EINTR;
 516         }
 517         if (timeo)
 518                 return -EAGAIN;
 519
 520         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 521                 if (sigismember (&kset, sig))
 522                         continue;
 523                 if (sigismember (&current->pending.signal, sig)) {
 524                         /* XXX need more than this... */
 525                         if (info)
 526                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 527                         return 0;
 528                 }
 529         }
 530
 531         /* Should not get here, but do something sane if we do. */
 532         error = -EINTR;
 533
 534 out:
 535         return error;
 536 }
 537
 538 /* This is here because of irix5_siginfo definition. */
 539 #define IRIX_P_PID    0
 540 #define IRIX_P_PGID   2
 541 #define IRIX_P_ALL    7
 542
 543 extern int getrusage(struct task_struct *, int, struct rusage __user *);
 544
 545 #define W_EXITED     1
 546 #define W_TRAPPED    2
 547 #define W_STOPPED    4
 548 #define W_CONT       8
 549 #define W_NOHANG    64
 550
 551 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 552
 553 asmlinkage int irix_waitsys(int type, int pid,
 554         struct irix5_siginfo __user *info, int options,
 555         struct rusage __user *ru)
 556 {
 557         int flag, retval;
 558         DECLARE_WAITQUEUE(wait, current);
 559         struct task_struct *tsk;
 560         struct task_struct *p;
 561         struct list_head *_p;
 562
 563         if (!info)
 564                 return -EINVAL;
 565
 566         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 567                 return -EFAULT;
 568
 569         if (ru)
 570                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 571                         return -EFAULT;
 572
 573         if (options & ~W_MASK)
 574                 return -EINVAL;
 575
 576         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 577                 return -EINVAL;
 578
 579         add_wait_queue(&current->signal->wait_chldexit, &wait);
 580 repeat:
 581         flag = 0;
 582         current->state = TASK_INTERRUPTIBLE;
 583         read_lock(&tasklist_lock);
 584         tsk = current;
 585         list_for_each(_p,&tsk->children) {
 586                 p = list_entry(_p,struct task_struct,sibling);
 587                 if ((type == IRIX_P_PID) && p->pid != pid)
 588                         continue;
 589                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 590                         continue;
 591                 if ((p->exit_signal != SIGCHLD))
 592                         continue;
 593                 flag = 1;
 594                 switch (p->state) {
 595                 case TASK_STOPPED:
 596                         if (!p->exit_code)
 597                                 continue;
 598                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 599                             !(p->ptrace & PT_PTRACED))
 600                                 continue;
 601                         read_unlock(&tasklist_lock);
 602
 603                         /* move to end of parent's list to avoid starvation */
 604                         write_lock_irq(&tasklist_lock);
 605                         remove_parent(p);
 606                         add_parent(p, p->parent);
 607                         write_unlock_irq(&tasklist_lock);
 608                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 609                         if (retval)
 610                                 goto end_waitsys;
 611
 612                         retval = __put_user(SIGCHLD, &info->sig);
 613                         retval |= __put_user(0, &info->code);
 614                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 615                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 616                                    &info->stuff.procinfo.procdata.child.status);
 617                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 618                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 619                         if (retval)
 620                                 goto end_waitsys;
 621
 622                         p->exit_code = 0;
 623                         goto end_waitsys;
 624
 625                 case EXIT_ZOMBIE:
 626                         current->signal->cutime += p->utime + p->signal->cutime;
 627                         current->signal->cstime += p->stime + p->signal->cstime;
 628                         if (ru != NULL)
 629                                 getrusage(p, RUSAGE_BOTH, ru);
 630                         retval = __put_user(SIGCHLD, &info->sig);
 631                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 632                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 633                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 634                                    &info->stuff.procinfo.procdata.child.status);
 635                         retval |= __put_user(p->utime,
 636                                    &info->stuff.procinfo.procdata.child.utime);
 637                         retval |= __put_user(p->stime,
 638                                    &info->stuff.procinfo.procdata.child.stime);
 639                         if (retval)
 640                                 return retval;
 641
 642                         if (p->real_parent != p->parent) {
 643                                 write_lock_irq(&tasklist_lock);
 644                                 remove_parent(p);
 645                                 p->parent = p->real_parent;
 646                                 add_parent(p, p->parent);
 647                                 do_notify_parent(p, SIGCHLD);
 648                                 write_unlock_irq(&tasklist_lock);
 649                         } else
 650                                 release_task(p);
 651                         goto end_waitsys;
 652                 default:
 653                         continue;
 654                 }
 655                 tsk = next_thread(tsk);
 656         }
 657         read_unlock(&tasklist_lock);
 658         if (flag) {
 659                 retval = 0;
 660                 if (options & W_NOHANG)
 661                         goto end_waitsys;
 662                 retval = -ERESTARTSYS;
 663                 if (signal_pending(current))
 664                         goto end_waitsys;
 665                 current->state = TASK_INTERRUPTIBLE;
 666                 schedule();
 667                 goto repeat;
 668         }
 669         retval = -ECHILD;
 670 end_waitsys:
 671         current->state = TASK_RUNNING;
 672         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 673
 674         return retval;
 675 }
 676
 677 struct irix5_context {
 678         u32 flags;
 679         u32 link;
 680         u32 sigmask[4];
 681         struct { u32 sp, size, flags; } stack;
 682         int regs[36];
 683         u32 fpregs[32];
 684         u32 fpcsr;
 685         u32 _unused0;
 686         u32 _unused1[47];
 687         u32 weird_graphics_thing;
 688 };
 689
 690 asmlinkage int irix_getcontext(struct pt_regs *regs)
 691 {
 692         int error, i, base = 0;
 693         struct irix5_context __user *ctx;
 694         unsigned long flags;
 695
 696         if (regs->regs[2] == 1000)
 697                 base = 1;
 698         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 699
 700 #ifdef DEBUG_SIG
 701         printk("[%s:%d] irix_getcontext(%p)\n",
 702                current->comm, current->pid, ctx);
 703 #endif
 704
 705         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)));
 706                 return -EFAULT;
 707
 708         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 709
 710         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 711
 712         /* XXX Do sigstack stuff someday... */
 713         error |= __put_user(0, &ctx->stack.sp);
 714         error |= __put_user(0, &ctx->stack.size);
 715         error |= __put_user(0, &ctx->stack.flags);
 716
 717         error |= __put_user(0, &ctx->weird_graphics_thing);
 718         error |= __put_user(0, &ctx->regs[0]);
 719         for (i = 1; i < 32; i++)
 720                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 721         error |= __put_user(regs->lo, &ctx->regs[32]);
 722         error |= __put_user(regs->hi, &ctx->regs[33]);
 723         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 724         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 725
 726         flags = 0x0f;
 727         if (!used_math()) {
 728                 flags &= ~(0x08);
 729         } else {
 730                 /* XXX wheee... */
 731                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 732         }
 733         error |= __put_user(flags, &ctx->flags);
 734
 735         return error;
 736 }
 737
 738 asmlinkage void irix_setcontext(struct pt_regs *regs)
 739 {
 740         struct irix5_context __user *ctx;
 741         int err, base = 0;
 742         u32 flags;
 743
 744         if (regs->regs[2] == 1000)
 745                 base = 1;
 746         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 747
 748 #ifdef DEBUG_SIG
 749         printk("[%s:%d] irix_setcontext(%p)\n",
 750                current->comm, current->pid, ctx);
 751 #endif
 752
 753         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 754                 goto segv_and_exit;
 755
 756         err = __get_user(flags, &ctx->flags);
 757         if (flags & 0x02) {
 758                 /* XXX sigstack garbage, todo... */
 759                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 760         }
 761
 762         if (flags & 0x04) {
 763                 int i;
 764
 765                 /* XXX extra control block stuff... todo... */
 766                 for (i = 1; i < 32; i++)
 767                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 768                 err |= __get_user(regs->lo, &ctx->regs[32]);
 769                 err |= __get_user(regs->hi, &ctx->regs[33]);
 770                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 771         }
 772
 773         if (flags & 0x08)
 774                 /* XXX fpu context, blah... */
 775                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 776
 777         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 778         if (err)
 779                 goto segv_and_exit;
 780
 781         /*
 782          * Don't let your children do this ...
 783          */
 784         __asm__ __volatile__(
 785                 "move\t$29,%0\n\t"
 786                 "j\tsyscall_exit"
 787                 :/* no outputs */
 788                 :"r" (&regs));
 789                 /* Unreached */
 790
 791 segv_and_exit:
 792         force_sigsegv(SIGSEGV, current);
 793 }
 794
 795 struct irix_sigstack {
 796         unsigned long sp;
 797         int status;
 798 };
 799
 800 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 801         struct irix_sigstack __user *old)
 802 {
 803 #ifdef DEBUG_SIG
 804         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 805                current->comm, current->pid, new, old);
 806 #endif
 807         if (new) {
 808                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 809                         return -EFAULT;
 810         }
 811
 812         if (old) {
 813                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 814                         return -EFAULT;
 815         }
 816
 817         return 0;
 818 }
 819
 820 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 821
 822 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 823                                 struct irix_sigaltstack __user *old)
 824 {
 825 #ifdef DEBUG_SIG
 826         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 827                current->comm, current->pid, new, old);
 828 #endif
 829         if (new)
 830                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 831                         return -EFAULT;
 832
 833         if (old) {
 834                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 835                         return -EFAULT;
 836         }
 837
 838         return 0;
 839 }
 840
 841 struct irix_procset {
 842         int cmd, ltype, lid, rtype, rid;
 843 };
 844
 845 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 846 {
 847         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 848                 return -EFAULT;
 849 #ifdef DEBUG_SIG
 850         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 851                current->comm, current->pid,
 852                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 853                sig);
 854 #endif
 855         return -EINVAL;
 856 }