git.oblomov.eu Git - linux-2.6/blob - arch/mips/kernel/irixsig.c

   1 /*
   2  * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible or what?!?!
   3  *
   4  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
   5  * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
   6  * Copyright (C) 2000 Silicon Graphics, Inc.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/mm.h>
  11 #include <linux/errno.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/time.h>
  15 #include <linux/ptrace.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19
  20 #undef DEBUG_SIG
  21
  22 #define _S(nr) (1<<((nr)-1))
  23
  24 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  25
  26 typedef struct {
  27         unsigned long sig[4];
  28 } irix_sigset_t;
  29
  30 struct sigctx_irix5 {
  31         u32 rmask, cp0_status;
  32         u64 pc;
  33         u64 regs[32];
  34         u64 fpregs[32];
  35         u32 usedfp, fpcsr, fpeir, sstk_flags;
  36         u64 hi, lo;
  37         u64 cp0_cause, cp0_badvaddr, _unused0;
  38         irix_sigset_t sigset;
  39         u64 weird_fpu_thing;
  40         u64 _unused1[31];
  41 };
  42
  43 #ifdef DEBUG_SIG
  44 /* Debugging */
  45 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  46 {
  47         int i;
  48
  49         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  50                (unsigned long) c->rmask,
  51                (unsigned long) c->cp0_status,
  52                (unsigned long) c->pc);
  53         printk("regs: ");
  54         for(i = 0; i < 16; i++)
  55                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  56         printk("\nregs: ");
  57         for(i = 16; i < 32; i++)
  58                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  59         printk("\nfpregs: ");
  60         for(i = 0; i < 16; i++)
  61                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  62         printk("\nfpregs: ");
  63         for(i = 16; i < 32; i++)
  64                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  65         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  66                (int) c->usedfp, (unsigned long) c->fpcsr,
  67                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  68         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  69                (unsigned long) c->hi, (unsigned long) c->lo,
  70                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  71         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  72                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  73                (unsigned long) c->sigset.sig[1],
  74                (unsigned long) c->sigset.sig[2],
  75                (unsigned long) c->sigset.sig[3]);
  76 }
  77 #endif
  78
  79 static void setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  80                              int signr, sigset_t *oldmask)
  81 {
  82         unsigned long sp;
  83         struct sigctx_irix5 *ctx;
  84         int i;
  85
  86         sp = regs->regs[29];
  87         sp -= sizeof(struct sigctx_irix5);
  88         sp &= ~(0xf);
  89         ctx = (struct sigctx_irix5 *) sp;
  90         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  91                 goto segv_and_exit;
  92
  93         __put_user(0, &ctx->weird_fpu_thing);
  94         __put_user(~(0x00000001), &ctx->rmask);
  95         __put_user(0, &ctx->regs[0]);
  96         for(i = 1; i < 32; i++)
  97                 __put_user((u64) regs->regs[i], &ctx->regs[i]);
  98
  99         __put_user((u64) regs->hi, &ctx->hi);
 100         __put_user((u64) regs->lo, &ctx->lo);
 101         __put_user((u64) regs->cp0_epc, &ctx->pc);
 102         __put_user(!!used_math(), &ctx->usedfp);
 103         __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 104         __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 105
 106         __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 107
 108         __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t));
 109
 110 #ifdef DEBUG_SIG
 111         dump_irix5_sigctx(ctx);
 112 #endif
 113
 114         regs->regs[4] = (unsigned long) signr;
 115         regs->regs[5] = 0; /* XXX sigcode XXX */
 116         regs->regs[6] = regs->regs[29] = sp;
 117         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 118         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 119
 120         return;
 121
 122 segv_and_exit:
 123         force_sigsegv(signr, current);
 124 }
 125
 126 static void inline
 127 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 128                int signr, sigset_t *oldmask, siginfo_t *info)
 129 {
 130         printk("Aiee: setup_tr_frame wants to be written");
 131         do_exit(SIGSEGV);
 132 }
 133
 134 static inline void handle_signal(unsigned long sig, siginfo_t *info,
 135         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 136 {
 137         switch(regs->regs[0]) {
 138         case ERESTARTNOHAND:
 139                 regs->regs[2] = EINTR;
 140                 break;
 141         case ERESTARTSYS:
 142                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 143                         regs->regs[2] = EINTR;
 144                         break;
 145                 }
 146         /* fallthrough */
 147         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 148                 regs->cp0_epc -= 8;
 149         }
 150
 151         regs->regs[0] = 0;              /* Don't deal with this again.  */
 152
 153         if (ka->sa.sa_flags & SA_SIGINFO)
 154                 setup_irix_rt_frame(ka, regs, sig, oldset, info);
 155         else
 156                 setup_irix_frame(ka, regs, sig, oldset);
 157
 158         spin_lock_irq(&current->sighand->siglock);
 159         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 160         if (!(ka->sa.sa_flags & SA_NODEFER))
 161                 sigaddset(&current->blocked,sig);
 162         recalc_sigpending();
 163         spin_unlock_irq(&current->sighand->siglock);
 164 }
 165
 166 asmlinkage int do_irix_signal(sigset_t *oldset, struct pt_regs *regs)
 167 {
 168         struct k_sigaction ka;
 169         siginfo_t info;
 170         int signr;
 171
 172         /*
 173          * We want the common case to go fast, which is why we may in certain
 174          * cases get here from kernel mode. Just return without doing anything
 175          * if so.
 176          */
 177         if (!user_mode(regs))
 178                 return 1;
 179
 180         if (try_to_freeze())
 181                 goto no_signal;
 182
 183         if (!oldset)
 184                 oldset = &current->blocked;
 185
 186         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 187         if (signr > 0) {
 188                 handle_signal(signr, &info, &ka, oldset, regs);
 189                 return 1;
 190         }
 191
 192 no_signal:
 193         /*
 194          * Who's code doesn't conform to the restartable syscall convention
 195          * dies here!!!  The li instruction, a single machine instruction,
 196          * must directly be followed by the syscall instruction.
 197          */
 198         if (regs->regs[0]) {
 199                 if (regs->regs[2] == ERESTARTNOHAND ||
 200                     regs->regs[2] == ERESTARTSYS ||
 201                     regs->regs[2] == ERESTARTNOINTR) {
 202                         regs->cp0_epc -= 8;
 203                 }
 204         }
 205         return 0;
 206 }
 207
 208 asmlinkage void
 209 irix_sigreturn(struct pt_regs *regs)
 210 {
 211         struct sigctx_irix5 *context, *magic;
 212         unsigned long umask, mask;
 213         u64 *fregs;
 214         int sig, i, base = 0;
 215         sigset_t blocked;
 216
 217         /* Always make any pending restarted system calls return -EINTR */
 218         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 219
 220         if (regs->regs[2] == 1000)
 221                 base = 1;
 222
 223         context = (struct sigctx_irix5 *) regs->regs[base + 4];
 224         magic = (struct sigctx_irix5 *) regs->regs[base + 5];
 225         sig = (int) regs->regs[base + 6];
 226 #ifdef DEBUG_SIG
 227         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 228                current->comm, current->pid, context, magic, sig);
 229 #endif
 230         if (!context)
 231                 context = magic;
 232         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 233                 goto badframe;
 234
 235 #ifdef DEBUG_SIG
 236         dump_irix5_sigctx(context);
 237 #endif
 238
 239         __get_user(regs->cp0_epc, &context->pc);
 240         umask = context->rmask; mask = 2;
 241         for (i = 1; i < 32; i++, mask <<= 1) {
 242                 if(umask & mask)
 243                         __get_user(regs->regs[i], &context->regs[i]);
 244         }
 245         __get_user(regs->hi, &context->hi);
 246         __get_user(regs->lo, &context->lo);
 247
 248         if ((umask & 1) && context->usedfp) {
 249                 fregs = (u64 *) &current->thread.fpu;
 250                 for(i = 0; i < 32; i++)
 251                         fregs[i] = (u64) context->fpregs[i];
 252                 __get_user(current->thread.fpu.hard.fcr31, &context->fpcsr);
 253         }
 254
 255         /* XXX do sigstack crapola here... XXX */
 256
 257         if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
 258                 goto badframe;
 259
 260         sigdelsetmask(&blocked, ~_BLOCKABLE);
 261         spin_lock_irq(&current->sighand->siglock);
 262         current->blocked = blocked;
 263         recalc_sigpending();
 264         spin_unlock_irq(&current->sighand->siglock);
 265
 266         /*
 267          * Don't let your children do this ...
 268          */
 269         if (current_thread_info()->flags & TIF_SYSCALL_TRACE)
 270                 do_syscall_trace(regs, 1);
 271         __asm__ __volatile__(
 272                 "move\t$29,%0\n\t"
 273                 "j\tsyscall_exit"
 274                 :/* no outputs */
 275                 :"r" (&regs));
 276                 /* Unreached */
 277
 278 badframe:
 279         force_sig(SIGSEGV, current);
 280 }
 281
 282 struct sigact_irix5 {
 283         int flags;
 284         void (*handler)(int);
 285         u32 sigset[4];
 286         int _unused0[2];
 287 };
 288
 289 #ifdef DEBUG_SIG
 290 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 291 {
 292         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 293                (unsigned long) p->handler,
 294                (unsigned long) p->sigset[0]);
 295 }
 296 #endif
 297
 298 asmlinkage int
 299 irix_sigaction(int sig, const struct sigaction *act,
 300               struct sigaction *oact, void *trampoline)
 301 {
 302         struct k_sigaction new_ka, old_ka;
 303         int ret;
 304
 305 #ifdef DEBUG_SIG
 306         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 307                (!old ? "0" : "OLD"), trampoline);
 308         if(new) {
 309                 dump_sigact_irix5(new); printk(" ");
 310         }
 311 #endif
 312         if (act) {
 313                 sigset_t mask;
 314                 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
 315                     __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
 316                     __get_user(new_ka.sa.sa_flags, &act->sa_flags))
 317                         return -EFAULT;
 318
 319                 __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t));
 320
 321                 /*
 322                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 323                  * value for all invocations of sigaction.  Will have to
 324                  * investigate.  POSIX POSIX, die die die...
 325                  */
 326                 new_ka.sa_restorer = trampoline;
 327         }
 328
 329 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 330         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 331
 332         if (!ret && oact) {
 333                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
 334                     __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
 335                     __put_user(old_ka.sa.sa_flags, &oact->sa_flags))
 336                         return -EFAULT;
 337                 __copy_to_user(&old_ka.sa.sa_mask, &oact->sa_mask,
 338                                sizeof(sigset_t));
 339         }
 340
 341         return ret;
 342 }
 343
 344 asmlinkage int irix_sigpending(irix_sigset_t *set)
 345 {
 346         return do_sigpending(set, sizeof(*set));
 347 }
 348
 349 asmlinkage int irix_sigprocmask(int how, irix_sigset_t *new, irix_sigset_t *old)
 350 {
 351         sigset_t oldbits, newbits;
 352
 353         if (new) {
 354                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 355                         return -EFAULT;
 356                 __copy_from_user(&newbits, new, sizeof(unsigned long)*4);
 357                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 358
 359                 spin_lock_irq(&current->sighand->siglock);
 360                 oldbits = current->blocked;
 361
 362                 switch(how) {
 363                 case 1:
 364                         sigorsets(&newbits, &oldbits, &newbits);
 365                         break;
 366
 367                 case 2:
 368                         sigandsets(&newbits, &oldbits, &newbits);
 369                         break;
 370
 371                 case 3:
 372                         break;
 373
 374                 case 256:
 375                         siginitset(&newbits, newbits.sig[0]);
 376                         break;
 377
 378                 default:
 379                         return -EINVAL;
 380                 }
 381                 recalc_sigpending();
 382                 spin_unlock_irq(&current->sighand->siglock);
 383         }
 384         if(old) {
 385                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 386                         return -EFAULT;
 387                 __copy_to_user(old, &current->blocked, sizeof(unsigned long)*4);
 388         }
 389
 390         return 0;
 391 }
 392
 393 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 394 {
 395         sigset_t *uset, saveset, newset;
 396
 397         uset = (sigset_t *) regs->regs[4];
 398         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 399                 return -EFAULT;
 400         sigdelsetmask(&newset, ~_BLOCKABLE);
 401
 402         spin_lock_irq(&current->sighand->siglock);
 403         saveset = current->blocked;
 404         current->blocked = newset;
 405         recalc_sigpending();
 406         spin_unlock_irq(&current->sighand->siglock);
 407
 408         regs->regs[2] = -EINTR;
 409         while (1) {
 410                 current->state = TASK_INTERRUPTIBLE;
 411                 schedule();
 412                 if (do_irix_signal(&saveset, regs))
 413                         return -EINTR;
 414         }
 415 }
 416
 417 /* hate hate hate... */
 418 struct irix5_siginfo {
 419         int sig, code, error;
 420         union {
 421                 char unused[128 - (3 * 4)]; /* Safety net. */
 422                 struct {
 423                         int pid;
 424                         union {
 425                                 int uid;
 426                                 struct {
 427                                         int utime, status, stime;
 428                                 } child;
 429                         } procdata;
 430                 } procinfo;
 431
 432                 unsigned long fault_addr;
 433
 434                 struct {
 435                         int fd;
 436                         long band;
 437                 } fileinfo;
 438
 439                 unsigned long sigval;
 440         } stuff;
 441 };
 442
 443 asmlinkage int irix_sigpoll_sys(unsigned long *set, struct irix5_siginfo *info,
 444                                 struct timespec *tp)
 445 {
 446         long expire = MAX_SCHEDULE_TIMEOUT;
 447         sigset_t kset;
 448         int i, sig, error, timeo = 0;
 449
 450 #ifdef DEBUG_SIG
 451         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 452                current->comm, current->pid, set, info, tp);
 453 #endif
 454
 455         /* Must always specify the signal set. */
 456         if (!set)
 457                 return -EINVAL;
 458
 459         if (!access_ok(VERIFY_READ, set, sizeof(kset))) {
 460                 error = -EFAULT;
 461                 goto out;
 462         }
 463
 464         __copy_from_user(&kset, set, sizeof(set));
 465         if (error)
 466                 goto out;
 467
 468         if (info && clear_user(info, sizeof(*info))) {
 469                 error = -EFAULT;
 470                 goto out;
 471         }
 472
 473         if (tp) {
 474                 if (!access_ok(VERIFY_READ, tp, sizeof(*tp)))
 475                         return -EFAULT;
 476                 if (!tp->tv_sec && !tp->tv_nsec) {
 477                         error = -EINVAL;
 478                         goto out;
 479                 }
 480                 expire = timespec_to_jiffies(tp) + (tp->tv_sec||tp->tv_nsec);
 481         }
 482
 483         while(1) {
 484                 long tmp = 0;
 485
 486                 expire = schedule_timeout_interruptible(expire);
 487
 488                 for (i=0; i<=4; i++)
 489                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 490
 491                 if (tmp)
 492                         break;
 493                 if (!expire) {
 494                         timeo = 1;
 495                         break;
 496                 }
 497                 if (signal_pending(current))
 498                         return -EINTR;
 499         }
 500         if (timeo)
 501                 return -EAGAIN;
 502
 503         for(sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 504                 if (sigismember (&kset, sig))
 505                         continue;
 506                 if (sigismember (&current->pending.signal, sig)) {
 507                         /* XXX need more than this... */
 508                         if (info)
 509                                 info->sig = sig;
 510                         error = 0;
 511                         goto out;
 512                 }
 513         }
 514
 515         /* Should not get here, but do something sane if we do. */
 516         error = -EINTR;
 517
 518 out:
 519         return error;
 520 }
 521
 522 /* This is here because of irix5_siginfo definition. */
 523 #define IRIX_P_PID    0
 524 #define IRIX_P_PGID   2
 525 #define IRIX_P_ALL    7
 526
 527 extern int getrusage(struct task_struct *, int, struct rusage __user *);
 528
 529 #define W_EXITED     1
 530 #define W_TRAPPED    2
 531 #define W_STOPPED    4
 532 #define W_CONT       8
 533 #define W_NOHANG    64
 534
 535 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 536
 537 asmlinkage int irix_waitsys(int type, int pid, struct irix5_siginfo *info,
 538                             int options, struct rusage *ru)
 539 {
 540         int flag, retval;
 541         DECLARE_WAITQUEUE(wait, current);
 542         struct task_struct *tsk;
 543         struct task_struct *p;
 544         struct list_head *_p;
 545
 546         if (!info) {
 547                 retval = -EINVAL;
 548                 goto out;
 549         }
 550         if (!access_ok(VERIFY_WRITE, info, sizeof(*info))) {
 551                 retval = -EFAULT;
 552                 goto out;
 553         }
 554         if (ru) {
 555                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru))) {
 556                         retval = -EFAULT;
 557                         goto out;
 558                 }
 559         }
 560         if (options & ~(W_MASK)) {
 561                 retval = -EINVAL;
 562                 goto out;
 563         }
 564         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL) {
 565                 retval = -EINVAL;
 566                 goto out;
 567         }
 568         add_wait_queue(&current->signal->wait_chldexit, &wait);
 569 repeat:
 570         flag = 0;
 571         current->state = TASK_INTERRUPTIBLE;
 572         read_lock(&tasklist_lock);
 573         tsk = current;
 574         list_for_each(_p,&tsk->children) {
 575                 p = list_entry(_p,struct task_struct,sibling);
 576                 if ((type == IRIX_P_PID) && p->pid != pid)
 577                         continue;
 578                 if ((type == IRIX_P_PGID) && process_group(p) != pid)
 579                         continue;
 580                 if ((p->exit_signal != SIGCHLD))
 581                         continue;
 582                 flag = 1;
 583                 switch (p->state) {
 584                 case TASK_STOPPED:
 585                         if (!p->exit_code)
 586                                 continue;
 587                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 588                             !(p->ptrace & PT_PTRACED))
 589                                 continue;
 590                         read_unlock(&tasklist_lock);
 591
 592                         /* move to end of parent's list to avoid starvation */
 593                         write_lock_irq(&tasklist_lock);
 594                         remove_parent(p);
 595                         add_parent(p, p->parent);
 596                         write_unlock_irq(&tasklist_lock);
 597                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 598                         if (!retval && ru) {
 599                                 retval |= __put_user(SIGCHLD, &info->sig);
 600                                 retval |= __put_user(0, &info->code);
 601                                 retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 602                                 retval |= __put_user((p->exit_code >> 8) & 0xff,
 603                                            &info->stuff.procinfo.procdata.child.status);
 604                                 retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 605                                 retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 606                         }
 607                         if (!retval) {
 608                                 p->exit_code = 0;
 609                         }
 610                         goto end_waitsys;
 611
 612                 case EXIT_ZOMBIE:
 613                         current->signal->cutime += p->utime + p->signal->cutime;
 614                         current->signal->cstime += p->stime + p->signal->cstime;
 615                         if (ru != NULL)
 616                                 getrusage(p, RUSAGE_BOTH, ru);
 617                         __put_user(SIGCHLD, &info->sig);
 618                         __put_user(1, &info->code);      /* CLD_EXITED */
 619                         __put_user(p->pid, &info->stuff.procinfo.pid);
 620                         __put_user((p->exit_code >> 8) & 0xff,
 621                                    &info->stuff.procinfo.procdata.child.status);
 622                         __put_user(p->utime,
 623                                    &info->stuff.procinfo.procdata.child.utime);
 624                         __put_user(p->stime,
 625                                    &info->stuff.procinfo.procdata.child.stime);
 626                         retval = 0;
 627                         if (p->real_parent != p->parent) {
 628                                 write_lock_irq(&tasklist_lock);
 629                                 remove_parent(p);
 630                                 p->parent = p->real_parent;
 631                                 add_parent(p, p->parent);
 632                                 do_notify_parent(p, SIGCHLD);
 633                                 write_unlock_irq(&tasklist_lock);
 634                         } else
 635                                 release_task(p);
 636                         goto end_waitsys;
 637                 default:
 638                         continue;
 639                 }
 640                 tsk = next_thread(tsk);
 641         }
 642         read_unlock(&tasklist_lock);
 643         if (flag) {
 644                 retval = 0;
 645                 if (options & W_NOHANG)
 646                         goto end_waitsys;
 647                 retval = -ERESTARTSYS;
 648                 if (signal_pending(current))
 649                         goto end_waitsys;
 650                 current->state = TASK_INTERRUPTIBLE;
 651                 schedule();
 652                 goto repeat;
 653         }
 654         retval = -ECHILD;
 655 end_waitsys:
 656         current->state = TASK_RUNNING;
 657         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 658
 659 out:
 660         return retval;
 661 }
 662
 663 struct irix5_context {
 664         u32 flags;
 665         u32 link;
 666         u32 sigmask[4];
 667         struct { u32 sp, size, flags; } stack;
 668         int regs[36];
 669         u32 fpregs[32];
 670         u32 fpcsr;
 671         u32 _unused0;
 672         u32 _unused1[47];
 673         u32 weird_graphics_thing;
 674 };
 675
 676 asmlinkage int irix_getcontext(struct pt_regs *regs)
 677 {
 678         int i, base = 0;
 679         struct irix5_context *ctx;
 680         unsigned long flags;
 681
 682         if (regs->regs[2] == 1000)
 683                 base = 1;
 684         ctx = (struct irix5_context *) regs->regs[base + 4];
 685
 686 #ifdef DEBUG_SIG
 687         printk("[%s:%d] irix_getcontext(%p)\n",
 688                current->comm, current->pid, ctx);
 689 #endif
 690
 691         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
 692                 return -EFAULT;
 693
 694         __put_user(current->thread.irix_oldctx, &ctx->link);
 695
 696         __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t));
 697
 698         /* XXX Do sigstack stuff someday... */
 699         __put_user(0, &ctx->stack.sp);
 700         __put_user(0, &ctx->stack.size);
 701         __put_user(0, &ctx->stack.flags);
 702
 703         __put_user(0, &ctx->weird_graphics_thing);
 704         __put_user(0, &ctx->regs[0]);
 705         for (i = 1; i < 32; i++)
 706                 __put_user(regs->regs[i], &ctx->regs[i]);
 707         __put_user(regs->lo, &ctx->regs[32]);
 708         __put_user(regs->hi, &ctx->regs[33]);
 709         __put_user(regs->cp0_cause, &ctx->regs[34]);
 710         __put_user(regs->cp0_epc, &ctx->regs[35]);
 711
 712         flags = 0x0f;
 713         if (!used_math()) {
 714                 flags &= ~(0x08);
 715         } else {
 716                 /* XXX wheee... */
 717                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 718         }
 719         __put_user(flags, &ctx->flags);
 720
 721         return 0;
 722 }
 723
 724 asmlinkage unsigned long irix_setcontext(struct pt_regs *regs)
 725 {
 726         int error, base = 0;
 727         struct irix5_context *ctx;
 728
 729         if(regs->regs[2] == 1000)
 730                 base = 1;
 731         ctx = (struct irix5_context *) regs->regs[base + 4];
 732
 733 #ifdef DEBUG_SIG
 734         printk("[%s:%d] irix_setcontext(%p)\n",
 735                current->comm, current->pid, ctx);
 736 #endif
 737
 738         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))) {
 739                 error = -EFAULT;
 740                 goto out;
 741         }
 742
 743         if (ctx->flags & 0x02) {
 744                 /* XXX sigstack garbage, todo... */
 745                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 746         }
 747
 748         if (ctx->flags & 0x04) {
 749                 int i;
 750
 751                 /* XXX extra control block stuff... todo... */
 752                 for(i = 1; i < 32; i++)
 753                         regs->regs[i] = ctx->regs[i];
 754                 regs->lo = ctx->regs[32];
 755                 regs->hi = ctx->regs[33];
 756                 regs->cp0_epc = ctx->regs[35];
 757         }
 758
 759         if (ctx->flags & 0x08) {
 760                 /* XXX fpu context, blah... */
 761                 printk("Wheee, cannot restore FPU context yet...\n");
 762         }
 763         current->thread.irix_oldctx = ctx->link;
 764         error = regs->regs[2];
 765
 766 out:
 767         return error;
 768 }
 769
 770 struct irix_sigstack { unsigned long sp; int status; };
 771
 772 asmlinkage int irix_sigstack(struct irix_sigstack *new, struct irix_sigstack *old)
 773 {
 774         int error = -EFAULT;
 775
 776 #ifdef DEBUG_SIG
 777         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 778                current->comm, current->pid, new, old);
 779 #endif
 780         if(new) {
 781                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 782                         goto out;
 783         }
 784
 785         if(old) {
 786                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 787                         goto out;
 788         }
 789         error = 0;
 790
 791 out:
 792         return error;
 793 }
 794
 795 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 796
 797 asmlinkage int irix_sigaltstack(struct irix_sigaltstack *new,
 798                                 struct irix_sigaltstack *old)
 799 {
 800         int error = -EFAULT;
 801
 802 #ifdef DEBUG_SIG
 803         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 804                current->comm, current->pid, new, old);
 805 #endif
 806         if (new) {
 807                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 808                         goto out;
 809         }
 810
 811         if (old) {
 812                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 813                         goto out;
 814         }
 815         error = 0;
 816
 817 out:
 818         error = 0;
 819
 820         return error;
 821 }
 822
 823 struct irix_procset {
 824         int cmd, ltype, lid, rtype, rid;
 825 };
 826
 827 asmlinkage int irix_sigsendset(struct irix_procset *pset, int sig)
 828 {
 829         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 830                 return -EFAULT;
 831
 832 #ifdef DEBUG_SIG
 833         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 834                current->comm, current->pid,
 835                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 836                sig);
 837 #endif
 838         return -EINVAL;
 839 }