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/time.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/resource.h>
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/uaccess.h>
  19 #include <asm/unistd.h>
  20
  21 #undef DEBUG_SIG
  22
  23 #define _S(nr) (1<<((nr)-1))
  24
  25 #define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
  26
  27 #define _IRIX_NSIG              128
  28 #define _IRIX_NSIG_BPW          BITS_PER_LONG
  29 #define _IRIX_NSIG_WORDS        (_IRIX_NSIG / _IRIX_NSIG_BPW)
  30
  31 typedef struct {
  32         unsigned long sig[_IRIX_NSIG_WORDS];
  33 } irix_sigset_t;
  34
  35 struct sigctx_irix5 {
  36         u32 rmask, cp0_status;
  37         u64 pc;
  38         u64 regs[32];
  39         u64 fpregs[32];
  40         u32 usedfp, fpcsr, fpeir, sstk_flags;
  41         u64 hi, lo;
  42         u64 cp0_cause, cp0_badvaddr, _unused0;
  43         irix_sigset_t sigset;
  44         u64 weird_fpu_thing;
  45         u64 _unused1[31];
  46 };
  47
  48 #ifdef DEBUG_SIG
  49 /* Debugging */
  50 static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
  51 {
  52         int i;
  53
  54         printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
  55                (unsigned long) c->rmask,
  56                (unsigned long) c->cp0_status,
  57                (unsigned long) c->pc);
  58         printk("regs: ");
  59         for(i = 0; i < 16; i++)
  60                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  61         printk("\nregs: ");
  62         for(i = 16; i < 32; i++)
  63                 printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
  64         printk("\nfpregs: ");
  65         for(i = 0; i < 16; i++)
  66                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  67         printk("\nfpregs: ");
  68         for(i = 16; i < 32; i++)
  69                 printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
  70         printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
  71                (int) c->usedfp, (unsigned long) c->fpcsr,
  72                (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
  73         printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
  74                (unsigned long) c->hi, (unsigned long) c->lo,
  75                (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
  76         printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
  77                "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
  78                (unsigned long) c->sigset.sig[1],
  79                (unsigned long) c->sigset.sig[2],
  80                (unsigned long) c->sigset.sig[3]);
  81 }
  82 #endif
  83
  84 static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
  85                             int signr, sigset_t *oldmask)
  86 {
  87         struct sigctx_irix5 __user *ctx;
  88         unsigned long sp;
  89         int error, i;
  90
  91         sp = regs->regs[29];
  92         sp -= sizeof(struct sigctx_irix5);
  93         sp &= ~(0xf);
  94         ctx = (struct sigctx_irix5 __user *) sp;
  95         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
  96                 goto segv_and_exit;
  97
  98         error = __put_user(0, &ctx->weird_fpu_thing);
  99         error |= __put_user(~(0x00000001), &ctx->rmask);
 100         error |= __put_user(0, &ctx->regs[0]);
 101         for(i = 1; i < 32; i++)
 102                 error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);
 103
 104         error |= __put_user((u64) regs->hi, &ctx->hi);
 105         error |= __put_user((u64) regs->lo, &ctx->lo);
 106         error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
 107         error |= __put_user(!!used_math(), &ctx->usedfp);
 108         error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
 109         error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);
 110
 111         error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */
 112
 113         error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 114
 115         if (error)
 116                 goto segv_and_exit;
 117
 118 #ifdef DEBUG_SIG
 119         dump_irix5_sigctx(ctx);
 120 #endif
 121
 122         regs->regs[4] = (unsigned long) signr;
 123         regs->regs[5] = 0; /* XXX sigcode XXX */
 124         regs->regs[6] = regs->regs[29] = sp;
 125         regs->regs[7] = (unsigned long) ka->sa.sa_handler;
 126         regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;
 127
 128         return 1;
 129
 130 segv_and_exit:
 131         force_sigsegv(signr, current);
 132         return 0;
 133 }
 134
 135 static int inline
 136 setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
 137                int signr, sigset_t *oldmask, siginfo_t *info)
 138 {
 139         printk("Aiee: setup_tr_frame wants to be written");
 140         do_exit(SIGSEGV);
 141 }
 142
 143 static inline int handle_signal(unsigned long sig, siginfo_t *info,
 144         struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
 145 {
 146         int ret;
 147
 148         switch(regs->regs[0]) {
 149         case ERESTARTNOHAND:
 150                 regs->regs[2] = EINTR;
 151                 break;
 152         case ERESTARTSYS:
 153                 if(!(ka->sa.sa_flags & SA_RESTART)) {
 154                         regs->regs[2] = EINTR;
 155                         break;
 156                 }
 157         /* fallthrough */
 158         case ERESTARTNOINTR:            /* Userland will reload $v0.  */
 159                 regs->cp0_epc -= 8;
 160         }
 161
 162         regs->regs[0] = 0;              /* Don't deal with this again.  */
 163
 164         if (ka->sa.sa_flags & SA_SIGINFO)
 165                 ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
 166         else
 167                 ret = setup_irix_frame(ka, regs, sig, oldset);
 168
 169         spin_lock_irq(&current->sighand->siglock);
 170         sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
 171         if (!(ka->sa.sa_flags & SA_NODEFER))
 172                 sigaddset(&current->blocked, sig);
 173         recalc_sigpending();
 174         spin_unlock_irq(&current->sighand->siglock);
 175
 176         return ret;
 177 }
 178
 179 void do_irix_signal(struct pt_regs *regs)
 180 {
 181         struct k_sigaction ka;
 182         siginfo_t info;
 183         int signr;
 184         sigset_t *oldset;
 185
 186         /*
 187          * We want the common case to go fast, which is why we may in certain
 188          * cases get here from kernel mode. Just return without doing anything
 189          * if so.
 190          */
 191         if (!user_mode(regs))
 192                 return;
 193
 194         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 195                 oldset = &current->saved_sigmask;
 196         else
 197                 oldset = &current->blocked;
 198
 199         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 200         if (signr > 0) {
 201                 /* Whee!  Actually deliver the signal.  */
 202                 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
 203                         /* a signal was successfully delivered; the saved
 204                          * sigmask will have been stored in the signal frame,
 205                          * and will be restored by sigreturn, so we can simply
 206                          * clear the TIF_RESTORE_SIGMASK flag */
 207                         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 208                                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 209                 }
 210
 211                 return;
 212         }
 213
 214         /*
 215          * Who's code doesn't conform to the restartable syscall convention
 216          * dies here!!!  The li instruction, a single machine instruction,
 217          * must directly be followed by the syscall instruction.
 218          */
 219         if (regs->regs[0]) {
 220                 if (regs->regs[2] == ERESTARTNOHAND ||
 221                     regs->regs[2] == ERESTARTSYS ||
 222                     regs->regs[2] == ERESTARTNOINTR) {
 223                         regs->cp0_epc -= 8;
 224                 }
 225                 if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
 226                         regs->regs[2] = __NR_restart_syscall;
 227                         regs->regs[7] = regs->regs[26];
 228                         regs->cp0_epc -= 4;
 229                 }
 230                 regs->regs[0] = 0;      /* Don't deal with this again.  */
 231         }
 232
 233         /*
 234         * If there's no signal to deliver, we just put the saved sigmask
 235         * back
 236         */
 237         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 238                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 239                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 240         }
 241 }
 242
 243 asmlinkage void
 244 irix_sigreturn(struct pt_regs *regs)
 245 {
 246         struct sigctx_irix5 __user *context, *magic;
 247         unsigned long umask, mask;
 248         u64 *fregs;
 249         u32 usedfp;
 250         int error, sig, i, base = 0;
 251         sigset_t blocked;
 252
 253         /* Always make any pending restarted system calls return -EINTR */
 254         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 255
 256         if (regs->regs[2] == 1000)
 257                 base = 1;
 258
 259         context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
 260         magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
 261         sig = (int) regs->regs[base + 6];
 262 #ifdef DEBUG_SIG
 263         printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
 264                current->comm, current->pid, context, magic, sig);
 265 #endif
 266         if (!context)
 267                 context = magic;
 268         if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
 269                 goto badframe;
 270
 271 #ifdef DEBUG_SIG
 272         dump_irix5_sigctx(context);
 273 #endif
 274
 275         error = __get_user(regs->cp0_epc, &context->pc);
 276         error |= __get_user(umask, &context->rmask);
 277
 278         mask = 2;
 279         for (i = 1; i < 32; i++, mask <<= 1) {
 280                 if (umask & mask)
 281                         error |= __get_user(regs->regs[i], &context->regs[i]);
 282         }
 283         error |= __get_user(regs->hi, &context->hi);
 284         error |= __get_user(regs->lo, &context->lo);
 285
 286         error |= __get_user(usedfp, &context->usedfp);
 287         if ((umask & 1) && usedfp) {
 288                 fregs = (u64 *) &current->thread.fpu;
 289
 290                 for(i = 0; i < 32; i++)
 291                         error |= __get_user(fregs[i], &context->fpregs[i]);
 292                 error |= __get_user(current->thread.fpu.fcr31, &context->fpcsr);
 293         }
 294
 295         /* XXX do sigstack crapola here... XXX */
 296
 297         error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;
 298
 299         if (error)
 300                 goto badframe;
 301
 302         sigdelsetmask(&blocked, ~_BLOCKABLE);
 303         spin_lock_irq(&current->sighand->siglock);
 304         current->blocked = blocked;
 305         recalc_sigpending();
 306         spin_unlock_irq(&current->sighand->siglock);
 307
 308         /*
 309          * Don't let your children do this ...
 310          */
 311         __asm__ __volatile__(
 312                 "move\t$29,%0\n\t"
 313                 "j\tsyscall_exit"
 314                 :/* no outputs */
 315                 :"r" (&regs));
 316                 /* Unreached */
 317
 318 badframe:
 319         force_sig(SIGSEGV, current);
 320 }
 321
 322 struct sigact_irix5 {
 323         int flags;
 324         void (*handler)(int);
 325         u32 sigset[4];
 326         int _unused0[2];
 327 };
 328
 329 #define SIG_SETMASK32   256     /* Goodie from SGI for BSD compatibility:
 330                                    set only the low 32 bit of the sigset.  */
 331
 332 #ifdef DEBUG_SIG
 333 static inline void dump_sigact_irix5(struct sigact_irix5 *p)
 334 {
 335         printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
 336                (unsigned long) p->handler,
 337                (unsigned long) p->sigset[0]);
 338 }
 339 #endif
 340
 341 asmlinkage int
 342 irix_sigaction(int sig, const struct sigaction __user *act,
 343               struct sigaction __user *oact, void __user *trampoline)
 344 {
 345         struct k_sigaction new_ka, old_ka;
 346         int ret;
 347
 348 #ifdef DEBUG_SIG
 349         printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
 350                (!old ? "0" : "OLD"), trampoline);
 351         if(new) {
 352                 dump_sigact_irix5(new); printk(" ");
 353         }
 354 #endif
 355         if (act) {
 356                 sigset_t mask;
 357                 int err;
 358
 359                 if (!access_ok(VERIFY_READ, act, sizeof(*act)))
 360                         return -EFAULT;
 361                 err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
 362                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 363
 364                 err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
 365                 if (err)
 366                         return err;
 367
 368                 /*
 369                  * Hmmm... methinks IRIX libc always passes a valid trampoline
 370                  * value for all invocations of sigaction.  Will have to
 371                  * investigate.  POSIX POSIX, die die die...
 372                  */
 373                 new_ka.sa_restorer = trampoline;
 374         }
 375
 376 /* XXX Implement SIG_SETMASK32 for IRIX compatibility */
 377         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 378
 379         if (!ret && oact) {
 380                 int err;
 381
 382                 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
 383                         return -EFAULT;
 384
 385                 err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
 386                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
 387                 err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
 388                                sizeof(sigset_t)) ? -EFAULT : 0;
 389                 if (err)
 390                         return -EFAULT;
 391         }
 392
 393         return ret;
 394 }
 395
 396 asmlinkage int irix_sigpending(irix_sigset_t __user *set)
 397 {
 398         return do_sigpending(set, sizeof(*set));
 399 }
 400
 401 asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
 402         irix_sigset_t __user *old)
 403 {
 404         sigset_t oldbits, newbits;
 405
 406         if (new) {
 407                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 408                         return -EFAULT;
 409                 if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
 410                         return -EFAULT;
 411                 sigdelsetmask(&newbits, ~_BLOCKABLE);
 412
 413                 spin_lock_irq(&current->sighand->siglock);
 414                 oldbits = current->blocked;
 415
 416                 switch(how) {
 417                 case 1:
 418                         sigorsets(&newbits, &oldbits, &newbits);
 419                         break;
 420
 421                 case 2:
 422                         sigandsets(&newbits, &oldbits, &newbits);
 423                         break;
 424
 425                 case 3:
 426                         break;
 427
 428                 case 256:
 429                         siginitset(&newbits, newbits.sig[0]);
 430                         break;
 431
 432                 default:
 433                         return -EINVAL;
 434                 }
 435                 recalc_sigpending();
 436                 spin_unlock_irq(&current->sighand->siglock);
 437         }
 438         if (old)
 439                 return copy_to_user(old, &current->blocked,
 440                                   sizeof(unsigned long)*4) ? -EFAULT : 0;
 441
 442         return 0;
 443 }
 444
 445 asmlinkage int irix_sigsuspend(struct pt_regs *regs)
 446 {
 447         sigset_t newset;
 448         sigset_t __user *uset;
 449
 450         uset = (sigset_t __user *) regs->regs[4];
 451         if (copy_from_user(&newset, uset, sizeof(sigset_t)))
 452                 return -EFAULT;
 453         sigdelsetmask(&newset, ~_BLOCKABLE);
 454
 455         spin_lock_irq(&current->sighand->siglock);
 456         current->saved_sigmask = current->blocked;
 457         current->blocked = newset;
 458         recalc_sigpending();
 459         spin_unlock_irq(&current->sighand->siglock);
 460
 461         current->state = TASK_INTERRUPTIBLE;
 462         schedule();
 463         set_thread_flag(TIF_RESTORE_SIGMASK);
 464         return -ERESTARTNOHAND;
 465 }
 466
 467 /* hate hate hate... */
 468 struct irix5_siginfo {
 469         int sig, code, error;
 470         union {
 471                 char unused[128 - (3 * 4)]; /* Safety net. */
 472                 struct {
 473                         int pid;
 474                         union {
 475                                 int uid;
 476                                 struct {
 477                                         int utime, status, stime;
 478                                 } child;
 479                         } procdata;
 480                 } procinfo;
 481
 482                 unsigned long fault_addr;
 483
 484                 struct {
 485                         int fd;
 486                         long band;
 487                 } fileinfo;
 488
 489                 unsigned long sigval;
 490         } stuff;
 491 };
 492
 493 asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
 494         struct irix5_siginfo __user *info, struct timespec __user *tp)
 495 {
 496         long expire = MAX_SCHEDULE_TIMEOUT;
 497         sigset_t kset;
 498         int i, sig, error, timeo = 0;
 499         struct timespec ktp;
 500
 501 #ifdef DEBUG_SIG
 502         printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
 503                current->comm, current->pid, set, info, tp);
 504 #endif
 505
 506         /* Must always specify the signal set. */
 507         if (!set)
 508                 return -EINVAL;
 509
 510         if (copy_from_user(&kset, set, sizeof(set)))
 511                 return -EFAULT;
 512
 513         if (info && clear_user(info, sizeof(*info))) {
 514                 error = -EFAULT;
 515                 goto out;
 516         }
 517
 518         if (tp) {
 519                 if (copy_from_user(&ktp, tp, sizeof(*tp)))
 520                         return -EFAULT;
 521
 522                 if (!ktp.tv_sec && !ktp.tv_nsec)
 523                         return -EINVAL;
 524
 525                 expire = timespec_to_jiffies(&ktp) +
 526                          (ktp.tv_sec || ktp.tv_nsec);
 527         }
 528
 529         while(1) {
 530                 long tmp = 0;
 531
 532                 expire = schedule_timeout_interruptible(expire);
 533
 534                 for (i=0; i < _IRIX_NSIG_WORDS; i++)
 535                         tmp |= (current->pending.signal.sig[i] & kset.sig[i]);
 536
 537                 if (tmp)
 538                         break;
 539                 if (!expire) {
 540                         timeo = 1;
 541                         break;
 542                 }
 543                 if (signal_pending(current))
 544                         return -EINTR;
 545         }
 546         if (timeo)
 547                 return -EAGAIN;
 548
 549         for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
 550                 if (sigismember (&kset, sig))
 551                         continue;
 552                 if (sigismember (&current->pending.signal, sig)) {
 553                         /* XXX need more than this... */
 554                         if (info)
 555                                 return copy_to_user(&info->sig, &sig, sizeof(sig));
 556                         return 0;
 557                 }
 558         }
 559
 560         /* Should not get here, but do something sane if we do. */
 561         error = -EINTR;
 562
 563 out:
 564         return error;
 565 }
 566
 567 /* This is here because of irix5_siginfo definition. */
 568 #define IRIX_P_PID    0
 569 #define IRIX_P_PGID   2
 570 #define IRIX_P_ALL    7
 571
 572 #define W_EXITED     1
 573 #define W_TRAPPED    2
 574 #define W_STOPPED    4
 575 #define W_CONT       8
 576 #define W_NOHANG    64
 577
 578 #define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)
 579
 580 asmlinkage int irix_waitsys(int type, int pid,
 581         struct irix5_siginfo __user *info, int options,
 582         struct rusage __user *ru)
 583 {
 584         int flag, retval;
 585         DECLARE_WAITQUEUE(wait, current);
 586         struct task_struct *tsk;
 587         struct task_struct *p;
 588         struct list_head *_p;
 589
 590         if (!info)
 591                 return -EINVAL;
 592
 593         if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
 594                 return -EFAULT;
 595
 596         if (ru)
 597                 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)))
 598                         return -EFAULT;
 599
 600         if (options & ~W_MASK)
 601                 return -EINVAL;
 602
 603         if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
 604                 return -EINVAL;
 605
 606         add_wait_queue(&current->signal->wait_chldexit, &wait);
 607 repeat:
 608         flag = 0;
 609         current->state = TASK_INTERRUPTIBLE;
 610         read_lock(&tasklist_lock);
 611         tsk = current;
 612         list_for_each(_p, &tsk->children) {
 613                 p = list_entry(_p, struct task_struct, sibling);
 614                 if ((type == IRIX_P_PID) && p->pid != pid)
 615                         continue;
 616                 if ((type == IRIX_P_PGID) && task_pgrp_nr(p) != pid)
 617                         continue;
 618                 if ((p->exit_signal != SIGCHLD))
 619                         continue;
 620                 flag = 1;
 621                 switch (p->state) {
 622                 case TASK_STOPPED:
 623                         if (!p->exit_code)
 624                                 continue;
 625                         if (!(options & (W_TRAPPED|W_STOPPED)) &&
 626                             !(p->ptrace & PT_PTRACED))
 627                                 continue;
 628                         read_unlock(&tasklist_lock);
 629
 630                         /* move to end of parent's list to avoid starvation */
 631                         write_lock_irq(&tasklist_lock);
 632                         remove_parent(p);
 633                         add_parent(p);
 634                         write_unlock_irq(&tasklist_lock);
 635                         retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
 636                         if (retval)
 637                                 goto end_waitsys;
 638
 639                         retval = __put_user(SIGCHLD, &info->sig);
 640                         retval |= __put_user(0, &info->code);
 641                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 642                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 643                                    &info->stuff.procinfo.procdata.child.status);
 644                         retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
 645                         retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
 646                         if (retval)
 647                                 goto end_waitsys;
 648
 649                         p->exit_code = 0;
 650                         goto end_waitsys;
 651
 652                 case EXIT_ZOMBIE:
 653                         current->signal->cutime += p->utime + p->signal->cutime;
 654                         current->signal->cstime += p->stime + p->signal->cstime;
 655                         if (ru != NULL)
 656                                 getrusage(p, RUSAGE_BOTH, ru);
 657                         retval = __put_user(SIGCHLD, &info->sig);
 658                         retval |= __put_user(1, &info->code);      /* CLD_EXITED */
 659                         retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
 660                         retval |= __put_user((p->exit_code >> 8) & 0xff,
 661                                    &info->stuff.procinfo.procdata.child.status);
 662                         retval |= __put_user(p->utime,
 663                                    &info->stuff.procinfo.procdata.child.utime);
 664                         retval |= __put_user(p->stime,
 665                                    &info->stuff.procinfo.procdata.child.stime);
 666                         if (retval)
 667                                 return retval;
 668
 669                         if (p->real_parent != p->parent) {
 670                                 write_lock_irq(&tasklist_lock);
 671                                 remove_parent(p);
 672                                 p->parent = p->real_parent;
 673                                 add_parent(p);
 674                                 do_notify_parent(p, SIGCHLD);
 675                                 write_unlock_irq(&tasklist_lock);
 676                         } else
 677                                 release_task(p);
 678                         goto end_waitsys;
 679                 default:
 680                         continue;
 681                 }
 682                 tsk = next_thread(tsk);
 683         }
 684         read_unlock(&tasklist_lock);
 685         if (flag) {
 686                 retval = 0;
 687                 if (options & W_NOHANG)
 688                         goto end_waitsys;
 689                 retval = -ERESTARTSYS;
 690                 if (signal_pending(current))
 691                         goto end_waitsys;
 692                 current->state = TASK_INTERRUPTIBLE;
 693                 schedule();
 694                 goto repeat;
 695         }
 696         retval = -ECHILD;
 697 end_waitsys:
 698         current->state = TASK_RUNNING;
 699         remove_wait_queue(&current->signal->wait_chldexit, &wait);
 700
 701         return retval;
 702 }
 703
 704 struct irix5_context {
 705         u32 flags;
 706         u32 link;
 707         u32 sigmask[4];
 708         struct { u32 sp, size, flags; } stack;
 709         int regs[36];
 710         u32 fpregs[32];
 711         u32 fpcsr;
 712         u32 _unused0;
 713         u32 _unused1[47];
 714         u32 weird_graphics_thing;
 715 };
 716
 717 asmlinkage int irix_getcontext(struct pt_regs *regs)
 718 {
 719         int error, i, base = 0;
 720         struct irix5_context __user *ctx;
 721         unsigned long flags;
 722
 723         if (regs->regs[2] == 1000)
 724                 base = 1;
 725         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 726
 727 #ifdef DEBUG_SIG
 728         printk("[%s:%d] irix_getcontext(%p)\n",
 729                current->comm, current->pid, ctx);
 730 #endif
 731
 732         if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
 733                 return -EFAULT;
 734
 735         error = __put_user(current->thread.irix_oldctx, &ctx->link);
 736
 737         error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;
 738
 739         /* XXX Do sigstack stuff someday... */
 740         error |= __put_user(0, &ctx->stack.sp);
 741         error |= __put_user(0, &ctx->stack.size);
 742         error |= __put_user(0, &ctx->stack.flags);
 743
 744         error |= __put_user(0, &ctx->weird_graphics_thing);
 745         error |= __put_user(0, &ctx->regs[0]);
 746         for (i = 1; i < 32; i++)
 747                 error |= __put_user(regs->regs[i], &ctx->regs[i]);
 748         error |= __put_user(regs->lo, &ctx->regs[32]);
 749         error |= __put_user(regs->hi, &ctx->regs[33]);
 750         error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
 751         error |= __put_user(regs->cp0_epc, &ctx->regs[35]);
 752
 753         flags = 0x0f;
 754         if (!used_math()) {
 755                 flags &= ~(0x08);
 756         } else {
 757                 /* XXX wheee... */
 758                 printk("Wheee, no code for saving IRIX FPU context yet.\n");
 759         }
 760         error |= __put_user(flags, &ctx->flags);
 761
 762         return error;
 763 }
 764
 765 asmlinkage void irix_setcontext(struct pt_regs *regs)
 766 {
 767         struct irix5_context __user *ctx;
 768         int err, base = 0;
 769         u32 flags;
 770
 771         if (regs->regs[2] == 1000)
 772                 base = 1;
 773         ctx = (struct irix5_context __user *) regs->regs[base + 4];
 774
 775 #ifdef DEBUG_SIG
 776         printk("[%s:%d] irix_setcontext(%p)\n",
 777                current->comm, current->pid, ctx);
 778 #endif
 779
 780         if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
 781                 goto segv_and_exit;
 782
 783         err = __get_user(flags, &ctx->flags);
 784         if (flags & 0x02) {
 785                 /* XXX sigstack garbage, todo... */
 786                 printk("Wheee, cannot do sigstack stuff in setcontext\n");
 787         }
 788
 789         if (flags & 0x04) {
 790                 int i;
 791
 792                 /* XXX extra control block stuff... todo... */
 793                 for (i = 1; i < 32; i++)
 794                         err |= __get_user(regs->regs[i], &ctx->regs[i]);
 795                 err |= __get_user(regs->lo, &ctx->regs[32]);
 796                 err |= __get_user(regs->hi, &ctx->regs[33]);
 797                 err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
 798         }
 799
 800         if (flags & 0x08)
 801                 /* XXX fpu context, blah... */
 802                 printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");
 803
 804         err |= __get_user(current->thread.irix_oldctx, &ctx->link);
 805         if (err)
 806                 goto segv_and_exit;
 807
 808         /*
 809          * Don't let your children do this ...
 810          */
 811         __asm__ __volatile__(
 812                 "move\t$29,%0\n\t"
 813                 "j\tsyscall_exit"
 814                 :/* no outputs */
 815                 :"r" (&regs));
 816                 /* Unreached */
 817
 818 segv_and_exit:
 819         force_sigsegv(SIGSEGV, current);
 820 }
 821
 822 struct irix_sigstack {
 823         unsigned long sp;
 824         int status;
 825 };
 826
 827 asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
 828         struct irix_sigstack __user *old)
 829 {
 830 #ifdef DEBUG_SIG
 831         printk("[%s:%d] irix_sigstack(%p,%p)\n",
 832                current->comm, current->pid, new, old);
 833 #endif
 834         if (new) {
 835                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 836                         return -EFAULT;
 837         }
 838
 839         if (old) {
 840                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 841                         return -EFAULT;
 842         }
 843
 844         return 0;
 845 }
 846
 847 struct irix_sigaltstack { unsigned long sp; int size; int status; };
 848
 849 asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
 850                                 struct irix_sigaltstack __user *old)
 851 {
 852 #ifdef DEBUG_SIG
 853         printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
 854                current->comm, current->pid, new, old);
 855 #endif
 856         if (new)
 857                 if (!access_ok(VERIFY_READ, new, sizeof(*new)))
 858                         return -EFAULT;
 859
 860         if (old) {
 861                 if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
 862                         return -EFAULT;
 863         }
 864
 865         return 0;
 866 }
 867
 868 struct irix_procset {
 869         int cmd, ltype, lid, rtype, rid;
 870 };
 871
 872 asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
 873 {
 874         if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
 875                 return -EFAULT;
 876 #ifdef DEBUG_SIG
 877         printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
 878                current->comm, current->pid,
 879                pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
 880                sig);
 881 #endif
 882         return -EINVAL;
 883 }