1 /* 2 * linux/arch/alpha/kernel/osf_sys.c 3 * 4 * Copyright (C) 1995 Linus Torvalds 5 */ 6 7 /* 8 * This file handles some of the stranger OSF/1 system call interfaces. 9 * Some of the system calls expect a non-C calling standard, others have 10 * special parameter blocks.. 11 */ 12 13 #include <linux/errno.h> 14 #include <linux/sched/signal.h> 15 #include <linux/sched/mm.h> 16 #include <linux/kernel.h> 17 #include <linux/mm.h> 18 #include <linux/smp.h> 19 #include <linux/stddef.h> 20 #include <linux/syscalls.h> 21 #include <linux/unistd.h> 22 #include <linux/ptrace.h> 23 #include <linux/user.h> 24 #include <linux/utsname.h> 25 #include <linux/time.h> 26 #include <linux/timex.h> 27 #include <linux/major.h> 28 #include <linux/stat.h> 29 #include <linux/mman.h> 30 #include <linux/shm.h> 31 #include <linux/poll.h> 32 #include <linux/file.h> 33 #include <linux/types.h> 34 #include <linux/ipc.h> 35 #include <linux/namei.h> 36 #include <linux/uio.h> 37 #include <linux/vfs.h> 38 #include <linux/rcupdate.h> 39 #include <linux/slab.h> 40 41 #include <asm/fpu.h> 42 #include <asm/io.h> 43 #include <linux/uaccess.h> 44 #include <asm/sysinfo.h> 45 #include <asm/thread_info.h> 46 #include <asm/hwrpb.h> 47 #include <asm/processor.h> 48 49 /* 50 * Brk needs to return an error. Still support Linux's brk(0) query idiom, 51 * which OSF programs just shouldn't be doing. We're still not quite 52 * identical to OSF as we don't return 0 on success, but doing otherwise 53 * would require changes to libc. Hopefully this is good enough. 54 */ 55 SYSCALL_DEFINE1(osf_brk, unsigned long, brk) 56 { 57 unsigned long retval = sys_brk(brk); 58 if (brk && brk != retval) 59 retval = -ENOMEM; 60 return retval; 61 } 62 63 /* 64 * This is pure guess-work.. 65 */ 66 SYSCALL_DEFINE4(osf_set_program_attributes, unsigned long, text_start, 67 unsigned long, text_len, unsigned long, bss_start, 68 unsigned long, bss_len) 69 { 70 struct mm_struct *mm; 71 72 mm = current->mm; 73 mm->end_code = bss_start + bss_len; 74 mm->start_brk = bss_start + bss_len; 75 mm->brk = bss_start + bss_len; 76 #if 0 77 printk("set_program_attributes(%lx %lx %lx %lx)\n", 78 text_start, text_len, bss_start, bss_len); 79 #endif 80 return 0; 81 } 82 83 /* 84 * OSF/1 directory handling functions... 85 * 86 * The "getdents()" interface is much more sane: the "basep" stuff is 87 * braindamage (it can't really handle filesystems where the directory 88 * offset differences aren't the same as "d_reclen"). 89 */ 90 #define NAME_OFFSET offsetof (struct osf_dirent, d_name) 91 92 struct osf_dirent { 93 unsigned int d_ino; 94 unsigned short d_reclen; 95 unsigned short d_namlen; 96 char d_name[1]; 97 }; 98 99 struct osf_dirent_callback { 100 struct dir_context ctx; 101 struct osf_dirent __user *dirent; 102 long __user *basep; 103 unsigned int count; 104 int error; 105 }; 106 107 static int 108 osf_filldir(struct dir_context *ctx, const char *name, int namlen, 109 loff_t offset, u64 ino, unsigned int d_type) 110 { 111 struct osf_dirent __user *dirent; 112 struct osf_dirent_callback *buf = 113 container_of(ctx, struct osf_dirent_callback, ctx); 114 unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32)); 115 unsigned int d_ino; 116 117 buf->error = -EINVAL; /* only used if we fail */ 118 if (reclen > buf->count) 119 return -EINVAL; 120 d_ino = ino; 121 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { 122 buf->error = -EOVERFLOW; 123 return -EOVERFLOW; 124 } 125 if (buf->basep) { 126 if (put_user(offset, buf->basep)) 127 goto Efault; 128 buf->basep = NULL; 129 } 130 dirent = buf->dirent; 131 if (put_user(d_ino, &dirent->d_ino) || 132 put_user(namlen, &dirent->d_namlen) || 133 put_user(reclen, &dirent->d_reclen) || 134 copy_to_user(dirent->d_name, name, namlen) || 135 put_user(0, dirent->d_name + namlen)) 136 goto Efault; 137 dirent = (void __user *)dirent + reclen; 138 buf->dirent = dirent; 139 buf->count -= reclen; 140 return 0; 141 Efault: 142 buf->error = -EFAULT; 143 return -EFAULT; 144 } 145 146 SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd, 147 struct osf_dirent __user *, dirent, unsigned int, count, 148 long __user *, basep) 149 { 150 int error; 151 struct fd arg = fdget_pos(fd); 152 struct osf_dirent_callback buf = { 153 .ctx.actor = osf_filldir, 154 .dirent = dirent, 155 .basep = basep, 156 .count = count 157 }; 158 159 if (!arg.file) 160 return -EBADF; 161 162 error = iterate_dir(arg.file, &buf.ctx); 163 if (error >= 0) 164 error = buf.error; 165 if (count != buf.count) 166 error = count - buf.count; 167 168 fdput_pos(arg); 169 return error; 170 } 171 172 #undef NAME_OFFSET 173 174 SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len, 175 unsigned long, prot, unsigned long, flags, unsigned long, fd, 176 unsigned long, off) 177 { 178 unsigned long ret = -EINVAL; 179 180 #if 0 181 if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED)) 182 printk("%s: unimplemented OSF mmap flags %04lx\n", 183 current->comm, flags); 184 #endif 185 if ((off + PAGE_ALIGN(len)) < off) 186 goto out; 187 if (off & ~PAGE_MASK) 188 goto out; 189 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 190 out: 191 return ret; 192 } 193 194 struct osf_stat { 195 int st_dev; 196 int st_pad1; 197 unsigned st_mode; 198 unsigned short st_nlink; 199 short st_nlink_reserved; 200 unsigned st_uid; 201 unsigned st_gid; 202 int st_rdev; 203 int st_ldev; 204 long st_size; 205 int st_pad2; 206 int st_uatime; 207 int st_pad3; 208 int st_umtime; 209 int st_pad4; 210 int st_uctime; 211 int st_pad5; 212 int st_pad6; 213 unsigned st_flags; 214 unsigned st_gen; 215 long st_spare[4]; 216 unsigned st_ino; 217 int st_ino_reserved; 218 int st_atime; 219 int st_atime_reserved; 220 int st_mtime; 221 int st_mtime_reserved; 222 int st_ctime; 223 int st_ctime_reserved; 224 long st_blksize; 225 long st_blocks; 226 }; 227 228 /* 229 * The OSF/1 statfs structure is much larger, but this should 230 * match the beginning, at least. 231 */ 232 struct osf_statfs { 233 short f_type; 234 short f_flags; 235 int f_fsize; 236 int f_bsize; 237 int f_blocks; 238 int f_bfree; 239 int f_bavail; 240 int f_files; 241 int f_ffree; 242 __kernel_fsid_t f_fsid; 243 }; 244 245 struct osf_statfs64 { 246 short f_type; 247 short f_flags; 248 int f_pad1; 249 int f_pad2; 250 int f_pad3; 251 int f_pad4; 252 int f_pad5; 253 int f_pad6; 254 int f_pad7; 255 __kernel_fsid_t f_fsid; 256 u_short f_namemax; 257 short f_reserved1; 258 int f_spare[8]; 259 char f_pad8[90]; 260 char f_pad9[90]; 261 long mount_info[10]; 262 u_long f_flags2; 263 long f_spare2[14]; 264 long f_fsize; 265 long f_bsize; 266 long f_blocks; 267 long f_bfree; 268 long f_bavail; 269 long f_files; 270 long f_ffree; 271 }; 272 273 static int 274 linux_to_osf_stat(struct kstat *lstat, struct osf_stat __user *osf_stat) 275 { 276 struct osf_stat tmp = { 0 }; 277 278 tmp.st_dev = lstat->dev; 279 tmp.st_mode = lstat->mode; 280 tmp.st_nlink = lstat->nlink; 281 tmp.st_uid = from_kuid_munged(current_user_ns(), lstat->uid); 282 tmp.st_gid = from_kgid_munged(current_user_ns(), lstat->gid); 283 tmp.st_rdev = lstat->rdev; 284 tmp.st_ldev = lstat->rdev; 285 tmp.st_size = lstat->size; 286 tmp.st_uatime = lstat->atime.tv_nsec / 1000; 287 tmp.st_umtime = lstat->mtime.tv_nsec / 1000; 288 tmp.st_uctime = lstat->ctime.tv_nsec / 1000; 289 tmp.st_ino = lstat->ino; 290 tmp.st_atime = lstat->atime.tv_sec; 291 tmp.st_mtime = lstat->mtime.tv_sec; 292 tmp.st_ctime = lstat->ctime.tv_sec; 293 tmp.st_blksize = lstat->blksize; 294 tmp.st_blocks = lstat->blocks; 295 296 return copy_to_user(osf_stat, &tmp, sizeof(tmp)) ? -EFAULT : 0; 297 } 298 299 static int 300 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat, 301 unsigned long bufsiz) 302 { 303 struct osf_statfs tmp_stat; 304 305 tmp_stat.f_type = linux_stat->f_type; 306 tmp_stat.f_flags = 0; /* mount flags */ 307 tmp_stat.f_fsize = linux_stat->f_frsize; 308 tmp_stat.f_bsize = linux_stat->f_bsize; 309 tmp_stat.f_blocks = linux_stat->f_blocks; 310 tmp_stat.f_bfree = linux_stat->f_bfree; 311 tmp_stat.f_bavail = linux_stat->f_bavail; 312 tmp_stat.f_files = linux_stat->f_files; 313 tmp_stat.f_ffree = linux_stat->f_ffree; 314 tmp_stat.f_fsid = linux_stat->f_fsid; 315 if (bufsiz > sizeof(tmp_stat)) 316 bufsiz = sizeof(tmp_stat); 317 return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0; 318 } 319 320 static int 321 linux_to_osf_statfs64(struct kstatfs *linux_stat, struct osf_statfs64 __user *osf_stat, 322 unsigned long bufsiz) 323 { 324 struct osf_statfs64 tmp_stat = { 0 }; 325 326 tmp_stat.f_type = linux_stat->f_type; 327 tmp_stat.f_fsize = linux_stat->f_frsize; 328 tmp_stat.f_bsize = linux_stat->f_bsize; 329 tmp_stat.f_blocks = linux_stat->f_blocks; 330 tmp_stat.f_bfree = linux_stat->f_bfree; 331 tmp_stat.f_bavail = linux_stat->f_bavail; 332 tmp_stat.f_files = linux_stat->f_files; 333 tmp_stat.f_ffree = linux_stat->f_ffree; 334 tmp_stat.f_fsid = linux_stat->f_fsid; 335 if (bufsiz > sizeof(tmp_stat)) 336 bufsiz = sizeof(tmp_stat); 337 return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0; 338 } 339 340 SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname, 341 struct osf_statfs __user *, buffer, unsigned long, bufsiz) 342 { 343 struct kstatfs linux_stat; 344 int error = user_statfs(pathname, &linux_stat); 345 if (!error) 346 error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz); 347 return error; 348 } 349 350 SYSCALL_DEFINE2(osf_stat, char __user *, name, struct osf_stat __user *, buf) 351 { 352 struct kstat stat; 353 int error; 354 355 error = vfs_stat(name, &stat); 356 if (error) 357 return error; 358 359 return linux_to_osf_stat(&stat, buf); 360 } 361 362 SYSCALL_DEFINE2(osf_lstat, char __user *, name, struct osf_stat __user *, buf) 363 { 364 struct kstat stat; 365 int error; 366 367 error = vfs_lstat(name, &stat); 368 if (error) 369 return error; 370 371 return linux_to_osf_stat(&stat, buf); 372 } 373 374 SYSCALL_DEFINE2(osf_fstat, int, fd, struct osf_stat __user *, buf) 375 { 376 struct kstat stat; 377 int error; 378 379 error = vfs_fstat(fd, &stat); 380 if (error) 381 return error; 382 383 return linux_to_osf_stat(&stat, buf); 384 } 385 386 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd, 387 struct osf_statfs __user *, buffer, unsigned long, bufsiz) 388 { 389 struct kstatfs linux_stat; 390 int error = fd_statfs(fd, &linux_stat); 391 if (!error) 392 error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz); 393 return error; 394 } 395 396 SYSCALL_DEFINE3(osf_statfs64, char __user *, pathname, 397 struct osf_statfs64 __user *, buffer, unsigned long, bufsiz) 398 { 399 struct kstatfs linux_stat; 400 int error = user_statfs(pathname, &linux_stat); 401 if (!error) 402 error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz); 403 return error; 404 } 405 406 SYSCALL_DEFINE3(osf_fstatfs64, unsigned long, fd, 407 struct osf_statfs64 __user *, buffer, unsigned long, bufsiz) 408 { 409 struct kstatfs linux_stat; 410 int error = fd_statfs(fd, &linux_stat); 411 if (!error) 412 error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz); 413 return error; 414 } 415 416 /* 417 * Uhh.. OSF/1 mount parameters aren't exactly obvious.. 418 * 419 * Although to be frank, neither are the native Linux/i386 ones.. 420 */ 421 struct ufs_args { 422 char __user *devname; 423 int flags; 424 uid_t exroot; 425 }; 426 427 struct cdfs_args { 428 char __user *devname; 429 int flags; 430 uid_t exroot; 431 432 /* This has lots more here, which Linux handles with the option block 433 but I'm too lazy to do the translation into ASCII. */ 434 }; 435 436 struct procfs_args { 437 char __user *devname; 438 int flags; 439 uid_t exroot; 440 }; 441 442 /* 443 * We can't actually handle ufs yet, so we translate UFS mounts to 444 * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS 445 * layout is so braindead it's a major headache doing it. 446 * 447 * Just how long ago was it written? OTOH our UFS driver may be still 448 * unhappy with OSF UFS. [CHECKME] 449 */ 450 static int 451 osf_ufs_mount(const char __user *dirname, 452 struct ufs_args __user *args, int flags) 453 { 454 int retval; 455 struct cdfs_args tmp; 456 struct filename *devname; 457 458 retval = -EFAULT; 459 if (copy_from_user(&tmp, args, sizeof(tmp))) 460 goto out; 461 devname = getname(tmp.devname); 462 retval = PTR_ERR(devname); 463 if (IS_ERR(devname)) 464 goto out; 465 retval = do_mount(devname->name, dirname, "ext2", flags, NULL); 466 putname(devname); 467 out: 468 return retval; 469 } 470 471 static int 472 osf_cdfs_mount(const char __user *dirname, 473 struct cdfs_args __user *args, int flags) 474 { 475 int retval; 476 struct cdfs_args tmp; 477 struct filename *devname; 478 479 retval = -EFAULT; 480 if (copy_from_user(&tmp, args, sizeof(tmp))) 481 goto out; 482 devname = getname(tmp.devname); 483 retval = PTR_ERR(devname); 484 if (IS_ERR(devname)) 485 goto out; 486 retval = do_mount(devname->name, dirname, "iso9660", flags, NULL); 487 putname(devname); 488 out: 489 return retval; 490 } 491 492 static int 493 osf_procfs_mount(const char __user *dirname, 494 struct procfs_args __user *args, int flags) 495 { 496 struct procfs_args tmp; 497 498 if (copy_from_user(&tmp, args, sizeof(tmp))) 499 return -EFAULT; 500 501 return do_mount("", dirname, "proc", flags, NULL); 502 } 503 504 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path, 505 int, flag, void __user *, data) 506 { 507 int retval; 508 509 switch (typenr) { 510 case 1: 511 retval = osf_ufs_mount(path, data, flag); 512 break; 513 case 6: 514 retval = osf_cdfs_mount(path, data, flag); 515 break; 516 case 9: 517 retval = osf_procfs_mount(path, data, flag); 518 break; 519 default: 520 retval = -EINVAL; 521 printk("osf_mount(%ld, %x)\n", typenr, flag); 522 } 523 524 return retval; 525 } 526 527 SYSCALL_DEFINE1(osf_utsname, char __user *, name) 528 { 529 int error; 530 531 down_read(&uts_sem); 532 error = -EFAULT; 533 if (copy_to_user(name + 0, utsname()->sysname, 32)) 534 goto out; 535 if (copy_to_user(name + 32, utsname()->nodename, 32)) 536 goto out; 537 if (copy_to_user(name + 64, utsname()->release, 32)) 538 goto out; 539 if (copy_to_user(name + 96, utsname()->version, 32)) 540 goto out; 541 if (copy_to_user(name + 128, utsname()->machine, 32)) 542 goto out; 543 544 error = 0; 545 out: 546 up_read(&uts_sem); 547 return error; 548 } 549 550 SYSCALL_DEFINE0(getpagesize) 551 { 552 return PAGE_SIZE; 553 } 554 555 SYSCALL_DEFINE0(getdtablesize) 556 { 557 return sysctl_nr_open; 558 } 559 560 /* 561 * For compatibility with OSF/1 only. Use utsname(2) instead. 562 */ 563 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen) 564 { 565 unsigned len; 566 int i; 567 568 if (!access_ok(VERIFY_WRITE, name, namelen)) 569 return -EFAULT; 570 571 len = namelen; 572 if (len > 32) 573 len = 32; 574 575 down_read(&uts_sem); 576 for (i = 0; i < len; ++i) { 577 __put_user(utsname()->domainname[i], name + i); 578 if (utsname()->domainname[i] == '\0') 579 break; 580 } 581 up_read(&uts_sem); 582 583 return 0; 584 } 585 586 /* 587 * The following stuff should move into a header file should it ever 588 * be labeled "officially supported." Right now, there is just enough 589 * support to avoid applications (such as tar) printing error 590 * messages. The attributes are not really implemented. 591 */ 592 593 /* 594 * Values for Property list entry flag 595 */ 596 #define PLE_PROPAGATE_ON_COPY 0x1 /* cp(1) will copy entry 597 by default */ 598 #define PLE_FLAG_MASK 0x1 /* Valid flag values */ 599 #define PLE_FLAG_ALL -1 /* All flag value */ 600 601 struct proplistname_args { 602 unsigned int pl_mask; 603 unsigned int pl_numnames; 604 char **pl_names; 605 }; 606 607 union pl_args { 608 struct setargs { 609 char __user *path; 610 long follow; 611 long nbytes; 612 char __user *buf; 613 } set; 614 struct fsetargs { 615 long fd; 616 long nbytes; 617 char __user *buf; 618 } fset; 619 struct getargs { 620 char __user *path; 621 long follow; 622 struct proplistname_args __user *name_args; 623 long nbytes; 624 char __user *buf; 625 int __user *min_buf_size; 626 } get; 627 struct fgetargs { 628 long fd; 629 struct proplistname_args __user *name_args; 630 long nbytes; 631 char __user *buf; 632 int __user *min_buf_size; 633 } fget; 634 struct delargs { 635 char __user *path; 636 long follow; 637 struct proplistname_args __user *name_args; 638 } del; 639 struct fdelargs { 640 long fd; 641 struct proplistname_args __user *name_args; 642 } fdel; 643 }; 644 645 enum pl_code { 646 PL_SET = 1, PL_FSET = 2, 647 PL_GET = 3, PL_FGET = 4, 648 PL_DEL = 5, PL_FDEL = 6 649 }; 650 651 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code, 652 union pl_args __user *, args) 653 { 654 long error; 655 int __user *min_buf_size_ptr; 656 657 switch (code) { 658 case PL_SET: 659 if (get_user(error, &args->set.nbytes)) 660 error = -EFAULT; 661 break; 662 case PL_FSET: 663 if (get_user(error, &args->fset.nbytes)) 664 error = -EFAULT; 665 break; 666 case PL_GET: 667 error = get_user(min_buf_size_ptr, &args->get.min_buf_size); 668 if (error) 669 break; 670 error = put_user(0, min_buf_size_ptr); 671 break; 672 case PL_FGET: 673 error = get_user(min_buf_size_ptr, &args->fget.min_buf_size); 674 if (error) 675 break; 676 error = put_user(0, min_buf_size_ptr); 677 break; 678 case PL_DEL: 679 case PL_FDEL: 680 error = 0; 681 break; 682 default: 683 error = -EOPNOTSUPP; 684 break; 685 }; 686 return error; 687 } 688 689 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss, 690 struct sigstack __user *, uoss) 691 { 692 unsigned long usp = rdusp(); 693 unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size; 694 unsigned long oss_os = on_sig_stack(usp); 695 int error; 696 697 if (uss) { 698 void __user *ss_sp; 699 700 error = -EFAULT; 701 if (get_user(ss_sp, &uss->ss_sp)) 702 goto out; 703 704 /* If the current stack was set with sigaltstack, don't 705 swap stacks while we are on it. */ 706 error = -EPERM; 707 if (current->sas_ss_sp && on_sig_stack(usp)) 708 goto out; 709 710 /* Since we don't know the extent of the stack, and we don't 711 track onstack-ness, but rather calculate it, we must 712 presume a size. Ho hum this interface is lossy. */ 713 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; 714 current->sas_ss_size = SIGSTKSZ; 715 } 716 717 if (uoss) { 718 error = -EFAULT; 719 if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)) 720 || __put_user(oss_sp, &uoss->ss_sp) 721 || __put_user(oss_os, &uoss->ss_onstack)) 722 goto out; 723 } 724 725 error = 0; 726 out: 727 return error; 728 } 729 730 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count) 731 { 732 const char *sysinfo_table[] = { 733 utsname()->sysname, 734 utsname()->nodename, 735 utsname()->release, 736 utsname()->version, 737 utsname()->machine, 738 "alpha", /* instruction set architecture */ 739 "dummy", /* hardware serial number */ 740 "dummy", /* hardware manufacturer */ 741 "dummy", /* secure RPC domain */ 742 }; 743 unsigned long offset; 744 const char *res; 745 long len, err = -EINVAL; 746 747 offset = command-1; 748 if (offset >= ARRAY_SIZE(sysinfo_table)) { 749 /* Digital UNIX has a few unpublished interfaces here */ 750 printk("sysinfo(%d)", command); 751 goto out; 752 } 753 754 down_read(&uts_sem); 755 res = sysinfo_table[offset]; 756 len = strlen(res)+1; 757 if ((unsigned long)len > (unsigned long)count) 758 len = count; 759 if (copy_to_user(buf, res, len)) 760 err = -EFAULT; 761 else 762 err = 0; 763 up_read(&uts_sem); 764 out: 765 return err; 766 } 767 768 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer, 769 unsigned long, nbytes, int __user *, start, void __user *, arg) 770 { 771 unsigned long w; 772 struct percpu_struct *cpu; 773 774 switch (op) { 775 case GSI_IEEE_FP_CONTROL: 776 /* Return current software fp control & status bits. */ 777 /* Note that DU doesn't verify available space here. */ 778 779 w = current_thread_info()->ieee_state & IEEE_SW_MASK; 780 w = swcr_update_status(w, rdfpcr()); 781 if (put_user(w, (unsigned long __user *) buffer)) 782 return -EFAULT; 783 return 0; 784 785 case GSI_IEEE_STATE_AT_SIGNAL: 786 /* 787 * Not sure anybody will ever use this weird stuff. These 788 * ops can be used (under OSF/1) to set the fpcr that should 789 * be used when a signal handler starts executing. 790 */ 791 break; 792 793 case GSI_UACPROC: 794 if (nbytes < sizeof(unsigned int)) 795 return -EINVAL; 796 w = current_thread_info()->status & UAC_BITMASK; 797 if (put_user(w, (unsigned int __user *)buffer)) 798 return -EFAULT; 799 return 1; 800 801 case GSI_PROC_TYPE: 802 if (nbytes < sizeof(unsigned long)) 803 return -EINVAL; 804 cpu = (struct percpu_struct*) 805 ((char*)hwrpb + hwrpb->processor_offset); 806 w = cpu->type; 807 if (put_user(w, (unsigned long __user*)buffer)) 808 return -EFAULT; 809 return 1; 810 811 case GSI_GET_HWRPB: 812 if (nbytes > sizeof(*hwrpb)) 813 return -EINVAL; 814 if (copy_to_user(buffer, hwrpb, nbytes) != 0) 815 return -EFAULT; 816 return 1; 817 818 default: 819 break; 820 } 821 822 return -EOPNOTSUPP; 823 } 824 825 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer, 826 unsigned long, nbytes, int __user *, start, void __user *, arg) 827 { 828 switch (op) { 829 case SSI_IEEE_FP_CONTROL: { 830 unsigned long swcr, fpcr; 831 unsigned int *state; 832 833 /* 834 * Alpha Architecture Handbook 4.7.7.3: 835 * To be fully IEEE compiant, we must track the current IEEE 836 * exception state in software, because spurious bits can be 837 * set in the trap shadow of a software-complete insn. 838 */ 839 840 if (get_user(swcr, (unsigned long __user *)buffer)) 841 return -EFAULT; 842 state = ¤t_thread_info()->ieee_state; 843 844 /* Update softare trap enable bits. */ 845 *state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK); 846 847 /* Update the real fpcr. */ 848 fpcr = rdfpcr() & FPCR_DYN_MASK; 849 fpcr |= ieee_swcr_to_fpcr(swcr); 850 wrfpcr(fpcr); 851 852 return 0; 853 } 854 855 case SSI_IEEE_RAISE_EXCEPTION: { 856 unsigned long exc, swcr, fpcr, fex; 857 unsigned int *state; 858 859 if (get_user(exc, (unsigned long __user *)buffer)) 860 return -EFAULT; 861 state = ¤t_thread_info()->ieee_state; 862 exc &= IEEE_STATUS_MASK; 863 864 /* Update softare trap enable bits. */ 865 swcr = (*state & IEEE_SW_MASK) | exc; 866 *state |= exc; 867 868 /* Update the real fpcr. */ 869 fpcr = rdfpcr(); 870 fpcr |= ieee_swcr_to_fpcr(swcr); 871 wrfpcr(fpcr); 872 873 /* If any exceptions set by this call, and are unmasked, 874 send a signal. Old exceptions are not signaled. */ 875 fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr; 876 if (fex) { 877 siginfo_t info; 878 int si_code = 0; 879 880 if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND; 881 if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES; 882 if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND; 883 if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF; 884 if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV; 885 if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV; 886 887 info.si_signo = SIGFPE; 888 info.si_errno = 0; 889 info.si_code = si_code; 890 info.si_addr = NULL; /* FIXME */ 891 send_sig_info(SIGFPE, &info, current); 892 } 893 return 0; 894 } 895 896 case SSI_IEEE_STATE_AT_SIGNAL: 897 case SSI_IEEE_IGNORE_STATE_AT_SIGNAL: 898 /* 899 * Not sure anybody will ever use this weird stuff. These 900 * ops can be used (under OSF/1) to set the fpcr that should 901 * be used when a signal handler starts executing. 902 */ 903 break; 904 905 case SSI_NVPAIRS: { 906 unsigned __user *p = buffer; 907 unsigned i; 908 909 for (i = 0, p = buffer; i < nbytes; ++i, p += 2) { 910 unsigned v, w, status; 911 912 if (get_user(v, p) || get_user(w, p + 1)) 913 return -EFAULT; 914 switch (v) { 915 case SSIN_UACPROC: 916 w &= UAC_BITMASK; 917 status = current_thread_info()->status; 918 status = (status & ~UAC_BITMASK) | w; 919 current_thread_info()->status = status; 920 break; 921 922 default: 923 return -EOPNOTSUPP; 924 } 925 } 926 return 0; 927 } 928 929 case SSI_LMF: 930 return 0; 931 932 default: 933 break; 934 } 935 936 return -EOPNOTSUPP; 937 } 938 939 /* Translations due to the fact that OSF's time_t is an int. Which 940 affects all sorts of things, like timeval and itimerval. */ 941 942 extern struct timezone sys_tz; 943 944 struct timeval32 945 { 946 int tv_sec, tv_usec; 947 }; 948 949 struct itimerval32 950 { 951 struct timeval32 it_interval; 952 struct timeval32 it_value; 953 }; 954 955 static inline long 956 get_tv32(struct timeval *o, struct timeval32 __user *i) 957 { 958 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 959 (__get_user(o->tv_sec, &i->tv_sec) | 960 __get_user(o->tv_usec, &i->tv_usec))); 961 } 962 963 static inline long 964 put_tv32(struct timeval32 __user *o, struct timeval *i) 965 { 966 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 967 (__put_user(i->tv_sec, &o->tv_sec) | 968 __put_user(i->tv_usec, &o->tv_usec))); 969 } 970 971 static inline long 972 get_it32(struct itimerval *o, struct itimerval32 __user *i) 973 { 974 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 975 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 976 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 977 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 978 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 979 } 980 981 static inline long 982 put_it32(struct itimerval32 __user *o, struct itimerval *i) 983 { 984 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 985 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 986 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 987 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 988 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 989 } 990 991 static inline void 992 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value) 993 { 994 value->tv_usec = (jiffies % HZ) * (1000000L / HZ); 995 value->tv_sec = jiffies / HZ; 996 } 997 998 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv, 999 struct timezone __user *, tz) 1000 { 1001 if (tv) { 1002 struct timeval ktv; 1003 do_gettimeofday(&ktv); 1004 if (put_tv32(tv, &ktv)) 1005 return -EFAULT; 1006 } 1007 if (tz) { 1008 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 1009 return -EFAULT; 1010 } 1011 return 0; 1012 } 1013 1014 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv, 1015 struct timezone __user *, tz) 1016 { 1017 struct timespec kts; 1018 struct timezone ktz; 1019 1020 if (tv) { 1021 if (get_tv32((struct timeval *)&kts, tv)) 1022 return -EFAULT; 1023 kts.tv_nsec *= 1000; 1024 } 1025 if (tz) { 1026 if (copy_from_user(&ktz, tz, sizeof(*tz))) 1027 return -EFAULT; 1028 } 1029 1030 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 1031 } 1032 1033 asmlinkage long sys_ni_posix_timers(void); 1034 1035 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it) 1036 { 1037 struct itimerval kit; 1038 int error; 1039 1040 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 1041 return sys_ni_posix_timers(); 1042 1043 error = do_getitimer(which, &kit); 1044 if (!error && put_it32(it, &kit)) 1045 error = -EFAULT; 1046 1047 return error; 1048 } 1049 1050 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in, 1051 struct itimerval32 __user *, out) 1052 { 1053 struct itimerval kin, kout; 1054 int error; 1055 1056 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 1057 return sys_ni_posix_timers(); 1058 1059 if (in) { 1060 if (get_it32(&kin, in)) 1061 return -EFAULT; 1062 } else 1063 memset(&kin, 0, sizeof(kin)); 1064 1065 error = do_setitimer(which, &kin, out ? &kout : NULL); 1066 if (error || !out) 1067 return error; 1068 1069 if (put_it32(out, &kout)) 1070 return -EFAULT; 1071 1072 return 0; 1073 1074 } 1075 1076 SYSCALL_DEFINE2(osf_utimes, const char __user *, filename, 1077 struct timeval32 __user *, tvs) 1078 { 1079 struct timespec tv[2]; 1080 1081 if (tvs) { 1082 struct timeval ktvs[2]; 1083 if (get_tv32(&ktvs[0], &tvs[0]) || 1084 get_tv32(&ktvs[1], &tvs[1])) 1085 return -EFAULT; 1086 1087 if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 || 1088 ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000) 1089 return -EINVAL; 1090 1091 tv[0].tv_sec = ktvs[0].tv_sec; 1092 tv[0].tv_nsec = 1000 * ktvs[0].tv_usec; 1093 tv[1].tv_sec = ktvs[1].tv_sec; 1094 tv[1].tv_nsec = 1000 * ktvs[1].tv_usec; 1095 } 1096 1097 return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0); 1098 } 1099 1100 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp, 1101 fd_set __user *, exp, struct timeval32 __user *, tvp) 1102 { 1103 struct timespec end_time, *to = NULL; 1104 if (tvp) { 1105 time_t sec, usec; 1106 1107 to = &end_time; 1108 1109 if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp)) 1110 || __get_user(sec, &tvp->tv_sec) 1111 || __get_user(usec, &tvp->tv_usec)) { 1112 return -EFAULT; 1113 } 1114 1115 if (sec < 0 || usec < 0) 1116 return -EINVAL; 1117 1118 if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC)) 1119 return -EINVAL; 1120 1121 } 1122 1123 /* OSF does not copy back the remaining time. */ 1124 return core_sys_select(n, inp, outp, exp, to); 1125 } 1126 1127 struct rusage32 { 1128 struct timeval32 ru_utime; /* user time used */ 1129 struct timeval32 ru_stime; /* system time used */ 1130 long ru_maxrss; /* maximum resident set size */ 1131 long ru_ixrss; /* integral shared memory size */ 1132 long ru_idrss; /* integral unshared data size */ 1133 long ru_isrss; /* integral unshared stack size */ 1134 long ru_minflt; /* page reclaims */ 1135 long ru_majflt; /* page faults */ 1136 long ru_nswap; /* swaps */ 1137 long ru_inblock; /* block input operations */ 1138 long ru_oublock; /* block output operations */ 1139 long ru_msgsnd; /* messages sent */ 1140 long ru_msgrcv; /* messages received */ 1141 long ru_nsignals; /* signals received */ 1142 long ru_nvcsw; /* voluntary context switches */ 1143 long ru_nivcsw; /* involuntary " */ 1144 }; 1145 1146 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru) 1147 { 1148 struct rusage32 r; 1149 u64 utime, stime; 1150 unsigned long utime_jiffies, stime_jiffies; 1151 1152 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) 1153 return -EINVAL; 1154 1155 memset(&r, 0, sizeof(r)); 1156 switch (who) { 1157 case RUSAGE_SELF: 1158 task_cputime(current, &utime, &stime); 1159 utime_jiffies = nsecs_to_jiffies(utime); 1160 stime_jiffies = nsecs_to_jiffies(stime); 1161 jiffies_to_timeval32(utime_jiffies, &r.ru_utime); 1162 jiffies_to_timeval32(stime_jiffies, &r.ru_stime); 1163 r.ru_minflt = current->min_flt; 1164 r.ru_majflt = current->maj_flt; 1165 break; 1166 case RUSAGE_CHILDREN: 1167 utime_jiffies = nsecs_to_jiffies(current->signal->cutime); 1168 stime_jiffies = nsecs_to_jiffies(current->signal->cstime); 1169 jiffies_to_timeval32(utime_jiffies, &r.ru_utime); 1170 jiffies_to_timeval32(stime_jiffies, &r.ru_stime); 1171 r.ru_minflt = current->signal->cmin_flt; 1172 r.ru_majflt = current->signal->cmaj_flt; 1173 break; 1174 } 1175 1176 return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; 1177 } 1178 1179 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options, 1180 struct rusage32 __user *, ur) 1181 { 1182 struct rusage r; 1183 long ret, err; 1184 unsigned int status = 0; 1185 mm_segment_t old_fs; 1186 1187 if (!ur) 1188 return sys_wait4(pid, ustatus, options, NULL); 1189 1190 old_fs = get_fs(); 1191 1192 set_fs (KERNEL_DS); 1193 ret = sys_wait4(pid, (unsigned int __user *) &status, options, 1194 (struct rusage __user *) &r); 1195 set_fs (old_fs); 1196 1197 if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur))) 1198 return -EFAULT; 1199 1200 err = 0; 1201 err |= put_user(status, ustatus); 1202 err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec); 1203 err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec); 1204 err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec); 1205 err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec); 1206 err |= __put_user(r.ru_maxrss, &ur->ru_maxrss); 1207 err |= __put_user(r.ru_ixrss, &ur->ru_ixrss); 1208 err |= __put_user(r.ru_idrss, &ur->ru_idrss); 1209 err |= __put_user(r.ru_isrss, &ur->ru_isrss); 1210 err |= __put_user(r.ru_minflt, &ur->ru_minflt); 1211 err |= __put_user(r.ru_majflt, &ur->ru_majflt); 1212 err |= __put_user(r.ru_nswap, &ur->ru_nswap); 1213 err |= __put_user(r.ru_inblock, &ur->ru_inblock); 1214 err |= __put_user(r.ru_oublock, &ur->ru_oublock); 1215 err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd); 1216 err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv); 1217 err |= __put_user(r.ru_nsignals, &ur->ru_nsignals); 1218 err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw); 1219 err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw); 1220 1221 return err ? err : ret; 1222 } 1223 1224 /* 1225 * I don't know what the parameters are: the first one 1226 * seems to be a timeval pointer, and I suspect the second 1227 * one is the time remaining.. Ho humm.. No documentation. 1228 */ 1229 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep, 1230 struct timeval32 __user *, remain) 1231 { 1232 struct timeval tmp; 1233 unsigned long ticks; 1234 1235 if (get_tv32(&tmp, sleep)) 1236 goto fault; 1237 1238 ticks = timeval_to_jiffies(&tmp); 1239 1240 ticks = schedule_timeout_interruptible(ticks); 1241 1242 if (remain) { 1243 jiffies_to_timeval(ticks, &tmp); 1244 if (put_tv32(remain, &tmp)) 1245 goto fault; 1246 } 1247 1248 return 0; 1249 fault: 1250 return -EFAULT; 1251 } 1252 1253 1254 struct timex32 { 1255 unsigned int modes; /* mode selector */ 1256 long offset; /* time offset (usec) */ 1257 long freq; /* frequency offset (scaled ppm) */ 1258 long maxerror; /* maximum error (usec) */ 1259 long esterror; /* estimated error (usec) */ 1260 int status; /* clock command/status */ 1261 long constant; /* pll time constant */ 1262 long precision; /* clock precision (usec) (read only) */ 1263 long tolerance; /* clock frequency tolerance (ppm) 1264 * (read only) 1265 */ 1266 struct timeval32 time; /* (read only) */ 1267 long tick; /* (modified) usecs between clock ticks */ 1268 1269 long ppsfreq; /* pps frequency (scaled ppm) (ro) */ 1270 long jitter; /* pps jitter (us) (ro) */ 1271 int shift; /* interval duration (s) (shift) (ro) */ 1272 long stabil; /* pps stability (scaled ppm) (ro) */ 1273 long jitcnt; /* jitter limit exceeded (ro) */ 1274 long calcnt; /* calibration intervals (ro) */ 1275 long errcnt; /* calibration errors (ro) */ 1276 long stbcnt; /* stability limit exceeded (ro) */ 1277 1278 int :32; int :32; int :32; int :32; 1279 int :32; int :32; int :32; int :32; 1280 int :32; int :32; int :32; int :32; 1281 }; 1282 1283 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p) 1284 { 1285 struct timex txc; 1286 int ret; 1287 1288 /* copy relevant bits of struct timex. */ 1289 if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) || 1290 copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) - 1291 offsetof(struct timex32, time))) 1292 return -EFAULT; 1293 1294 ret = do_adjtimex(&txc); 1295 if (ret < 0) 1296 return ret; 1297 1298 /* copy back to timex32 */ 1299 if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) || 1300 (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) - 1301 offsetof(struct timex32, tick))) || 1302 (put_tv32(&txc_p->time, &txc.time))) 1303 return -EFAULT; 1304 1305 return ret; 1306 } 1307 1308 /* Get an address range which is currently unmapped. Similar to the 1309 generic version except that we know how to honor ADDR_LIMIT_32BIT. */ 1310 1311 static unsigned long 1312 arch_get_unmapped_area_1(unsigned long addr, unsigned long len, 1313 unsigned long limit) 1314 { 1315 struct vm_unmapped_area_info info; 1316 1317 info.flags = 0; 1318 info.length = len; 1319 info.low_limit = addr; 1320 info.high_limit = limit; 1321 info.align_mask = 0; 1322 info.align_offset = 0; 1323 return vm_unmapped_area(&info); 1324 } 1325 1326 unsigned long 1327 arch_get_unmapped_area(struct file *filp, unsigned long addr, 1328 unsigned long len, unsigned long pgoff, 1329 unsigned long flags) 1330 { 1331 unsigned long limit; 1332 1333 /* "32 bit" actually means 31 bit, since pointers sign extend. */ 1334 if (current->personality & ADDR_LIMIT_32BIT) 1335 limit = 0x80000000; 1336 else 1337 limit = TASK_SIZE; 1338 1339 if (len > limit) 1340 return -ENOMEM; 1341 1342 if (flags & MAP_FIXED) 1343 return addr; 1344 1345 /* First, see if the given suggestion fits. 1346 1347 The OSF/1 loader (/sbin/loader) relies on us returning an 1348 address larger than the requested if one exists, which is 1349 a terribly broken way to program. 1350 1351 That said, I can see the use in being able to suggest not 1352 merely specific addresses, but regions of memory -- perhaps 1353 this feature should be incorporated into all ports? */ 1354 1355 if (addr) { 1356 addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit); 1357 if (addr != (unsigned long) -ENOMEM) 1358 return addr; 1359 } 1360 1361 /* Next, try allocating at TASK_UNMAPPED_BASE. */ 1362 addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE), 1363 len, limit); 1364 if (addr != (unsigned long) -ENOMEM) 1365 return addr; 1366 1367 /* Finally, try allocating in low memory. */ 1368 addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit); 1369 1370 return addr; 1371 } 1372 1373 #ifdef CONFIG_OSF4_COMPAT 1374 1375 /* Clear top 32 bits of iov_len in the user's buffer for 1376 compatibility with old versions of OSF/1 where iov_len 1377 was defined as int. */ 1378 static int 1379 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count) 1380 { 1381 unsigned long i; 1382 1383 for (i = 0 ; i < count ; i++) { 1384 int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1; 1385 1386 if (put_user(0, iov_len_high)) 1387 return -EFAULT; 1388 } 1389 return 0; 1390 } 1391 1392 SYSCALL_DEFINE3(osf_readv, unsigned long, fd, 1393 const struct iovec __user *, vector, unsigned long, count) 1394 { 1395 if (unlikely(personality(current->personality) == PER_OSF4)) 1396 if (osf_fix_iov_len(vector, count)) 1397 return -EFAULT; 1398 return sys_readv(fd, vector, count); 1399 } 1400 1401 SYSCALL_DEFINE3(osf_writev, unsigned long, fd, 1402 const struct iovec __user *, vector, unsigned long, count) 1403 { 1404 if (unlikely(personality(current->personality) == PER_OSF4)) 1405 if (osf_fix_iov_len(vector, count)) 1406 return -EFAULT; 1407 return sys_writev(fd, vector, count); 1408 } 1409 1410 #endif 1411 1412 SYSCALL_DEFINE2(osf_getpriority, int, which, int, who) 1413 { 1414 int prio = sys_getpriority(which, who); 1415 if (prio >= 0) { 1416 /* Return value is the unbiased priority, i.e. 20 - prio. 1417 This does result in negative return values, so signal 1418 no error */ 1419 force_successful_syscall_return(); 1420 prio = 20 - prio; 1421 } 1422 return prio; 1423 } 1424 1425 SYSCALL_DEFINE0(getxuid) 1426 { 1427 current_pt_regs()->r20 = sys_geteuid(); 1428 return sys_getuid(); 1429 } 1430 1431 SYSCALL_DEFINE0(getxgid) 1432 { 1433 current_pt_regs()->r20 = sys_getegid(); 1434 return sys_getgid(); 1435 } 1436 1437 SYSCALL_DEFINE0(getxpid) 1438 { 1439 current_pt_regs()->r20 = sys_getppid(); 1440 return sys_getpid(); 1441 } 1442 1443 SYSCALL_DEFINE0(alpha_pipe) 1444 { 1445 int fd[2]; 1446 int res = do_pipe_flags(fd, 0); 1447 if (!res) { 1448 /* The return values are in $0 and $20. */ 1449 current_pt_regs()->r20 = fd[1]; 1450 res = fd[0]; 1451 } 1452 return res; 1453 } 1454 1455 SYSCALL_DEFINE1(sethae, unsigned long, val) 1456 { 1457 current_pt_regs()->hae = val; 1458 return 0; 1459 } 1460