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