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/sched/task_stack.h> 17 #include <linux/sched/cputime.h> 18 #include <linux/kernel.h> 19 #include <linux/mm.h> 20 #include <linux/smp.h> 21 #include <linux/stddef.h> 22 #include <linux/syscalls.h> 23 #include <linux/unistd.h> 24 #include <linux/ptrace.h> 25 #include <linux/user.h> 26 #include <linux/utsname.h> 27 #include <linux/time.h> 28 #include <linux/timex.h> 29 #include <linux/major.h> 30 #include <linux/stat.h> 31 #include <linux/mman.h> 32 #include <linux/shm.h> 33 #include <linux/poll.h> 34 #include <linux/file.h> 35 #include <linux/types.h> 36 #include <linux/ipc.h> 37 #include <linux/namei.h> 38 #include <linux/uio.h> 39 #include <linux/vfs.h> 40 #include <linux/rcupdate.h> 41 #include <linux/slab.h> 42 43 #include <asm/fpu.h> 44 #include <asm/io.h> 45 #include <linux/uaccess.h> 46 #include <asm/sysinfo.h> 47 #include <asm/thread_info.h> 48 #include <asm/hwrpb.h> 49 #include <asm/processor.h> 50 51 /* 52 * Brk needs to return an error. Still support Linux's brk(0) query idiom, 53 * which OSF programs just shouldn't be doing. We're still not quite 54 * identical to OSF as we don't return 0 on success, but doing otherwise 55 * would require changes to libc. Hopefully this is good enough. 56 */ 57 SYSCALL_DEFINE1(osf_brk, unsigned long, brk) 58 { 59 unsigned long retval = sys_brk(brk); 60 if (brk && brk != retval) 61 retval = -ENOMEM; 62 return retval; 63 } 64 65 /* 66 * This is pure guess-work.. 67 */ 68 SYSCALL_DEFINE4(osf_set_program_attributes, unsigned long, text_start, 69 unsigned long, text_len, unsigned long, bss_start, 70 unsigned long, bss_len) 71 { 72 struct mm_struct *mm; 73 74 mm = current->mm; 75 mm->end_code = bss_start + bss_len; 76 mm->start_brk = bss_start + bss_len; 77 mm->brk = bss_start + bss_len; 78 #if 0 79 printk("set_program_attributes(%lx %lx %lx %lx)\n", 80 text_start, text_len, bss_start, bss_len); 81 #endif 82 return 0; 83 } 84 85 /* 86 * OSF/1 directory handling functions... 87 * 88 * The "getdents()" interface is much more sane: the "basep" stuff is 89 * braindamage (it can't really handle filesystems where the directory 90 * offset differences aren't the same as "d_reclen"). 91 */ 92 #define NAME_OFFSET offsetof (struct osf_dirent, d_name) 93 94 struct osf_dirent { 95 unsigned int d_ino; 96 unsigned short d_reclen; 97 unsigned short d_namlen; 98 char d_name[1]; 99 }; 100 101 struct osf_dirent_callback { 102 struct dir_context ctx; 103 struct osf_dirent __user *dirent; 104 long __user *basep; 105 unsigned int count; 106 int error; 107 }; 108 109 static int 110 osf_filldir(struct dir_context *ctx, const char *name, int namlen, 111 loff_t offset, u64 ino, unsigned int d_type) 112 { 113 struct osf_dirent __user *dirent; 114 struct osf_dirent_callback *buf = 115 container_of(ctx, struct osf_dirent_callback, ctx); 116 unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32)); 117 unsigned int d_ino; 118 119 buf->error = -EINVAL; /* only used if we fail */ 120 if (reclen > buf->count) 121 return -EINVAL; 122 d_ino = ino; 123 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { 124 buf->error = -EOVERFLOW; 125 return -EOVERFLOW; 126 } 127 if (buf->basep) { 128 if (put_user(offset, buf->basep)) 129 goto Efault; 130 buf->basep = NULL; 131 } 132 dirent = buf->dirent; 133 if (put_user(d_ino, &dirent->d_ino) || 134 put_user(namlen, &dirent->d_namlen) || 135 put_user(reclen, &dirent->d_reclen) || 136 copy_to_user(dirent->d_name, name, namlen) || 137 put_user(0, dirent->d_name + namlen)) 138 goto Efault; 139 dirent = (void __user *)dirent + reclen; 140 buf->dirent = dirent; 141 buf->count -= reclen; 142 return 0; 143 Efault: 144 buf->error = -EFAULT; 145 return -EFAULT; 146 } 147 148 SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd, 149 struct osf_dirent __user *, dirent, unsigned int, count, 150 long __user *, basep) 151 { 152 int error; 153 struct fd arg = fdget_pos(fd); 154 struct osf_dirent_callback buf = { 155 .ctx.actor = osf_filldir, 156 .dirent = dirent, 157 .basep = basep, 158 .count = count 159 }; 160 161 if (!arg.file) 162 return -EBADF; 163 164 error = iterate_dir(arg.file, &buf.ctx); 165 if (error >= 0) 166 error = buf.error; 167 if (count != buf.count) 168 error = count - buf.count; 169 170 fdput_pos(arg); 171 return error; 172 } 173 174 #undef NAME_OFFSET 175 176 SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len, 177 unsigned long, prot, unsigned long, flags, unsigned long, fd, 178 unsigned long, off) 179 { 180 unsigned long ret = -EINVAL; 181 182 #if 0 183 if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED)) 184 printk("%s: unimplemented OSF mmap flags %04lx\n", 185 current->comm, flags); 186 #endif 187 if ((off + PAGE_ALIGN(len)) < off) 188 goto out; 189 if (off & ~PAGE_MASK) 190 goto out; 191 ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 192 out: 193 return ret; 194 } 195 196 struct osf_stat { 197 int st_dev; 198 int st_pad1; 199 unsigned st_mode; 200 unsigned short st_nlink; 201 short st_nlink_reserved; 202 unsigned st_uid; 203 unsigned st_gid; 204 int st_rdev; 205 int st_ldev; 206 long st_size; 207 int st_pad2; 208 int st_uatime; 209 int st_pad3; 210 int st_umtime; 211 int st_pad4; 212 int st_uctime; 213 int st_pad5; 214 int st_pad6; 215 unsigned st_flags; 216 unsigned st_gen; 217 long st_spare[4]; 218 unsigned st_ino; 219 int st_ino_reserved; 220 int st_atime; 221 int st_atime_reserved; 222 int st_mtime; 223 int st_mtime_reserved; 224 int st_ctime; 225 int st_ctime_reserved; 226 long st_blksize; 227 long st_blocks; 228 }; 229 230 /* 231 * The OSF/1 statfs structure is much larger, but this should 232 * match the beginning, at least. 233 */ 234 struct osf_statfs { 235 short f_type; 236 short f_flags; 237 int f_fsize; 238 int f_bsize; 239 int f_blocks; 240 int f_bfree; 241 int f_bavail; 242 int f_files; 243 int f_ffree; 244 __kernel_fsid_t f_fsid; 245 }; 246 247 struct osf_statfs64 { 248 short f_type; 249 short f_flags; 250 int f_pad1; 251 int f_pad2; 252 int f_pad3; 253 int f_pad4; 254 int f_pad5; 255 int f_pad6; 256 int f_pad7; 257 __kernel_fsid_t f_fsid; 258 u_short f_namemax; 259 short f_reserved1; 260 int f_spare[8]; 261 char f_pad8[90]; 262 char f_pad9[90]; 263 long mount_info[10]; 264 u_long f_flags2; 265 long f_spare2[14]; 266 long f_fsize; 267 long f_bsize; 268 long f_blocks; 269 long f_bfree; 270 long f_bavail; 271 long f_files; 272 long f_ffree; 273 }; 274 275 static int 276 linux_to_osf_stat(struct kstat *lstat, struct osf_stat __user *osf_stat) 277 { 278 struct osf_stat tmp = { 0 }; 279 280 tmp.st_dev = lstat->dev; 281 tmp.st_mode = lstat->mode; 282 tmp.st_nlink = lstat->nlink; 283 tmp.st_uid = from_kuid_munged(current_user_ns(), lstat->uid); 284 tmp.st_gid = from_kgid_munged(current_user_ns(), lstat->gid); 285 tmp.st_rdev = lstat->rdev; 286 tmp.st_ldev = lstat->rdev; 287 tmp.st_size = lstat->size; 288 tmp.st_uatime = lstat->atime.tv_nsec / 1000; 289 tmp.st_umtime = lstat->mtime.tv_nsec / 1000; 290 tmp.st_uctime = lstat->ctime.tv_nsec / 1000; 291 tmp.st_ino = lstat->ino; 292 tmp.st_atime = lstat->atime.tv_sec; 293 tmp.st_mtime = lstat->mtime.tv_sec; 294 tmp.st_ctime = lstat->ctime.tv_sec; 295 tmp.st_blksize = lstat->blksize; 296 tmp.st_blocks = lstat->blocks; 297 298 return copy_to_user(osf_stat, &tmp, sizeof(tmp)) ? -EFAULT : 0; 299 } 300 301 static int 302 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat, 303 unsigned long bufsiz) 304 { 305 struct osf_statfs tmp_stat; 306 307 tmp_stat.f_type = linux_stat->f_type; 308 tmp_stat.f_flags = 0; /* mount flags */ 309 tmp_stat.f_fsize = linux_stat->f_frsize; 310 tmp_stat.f_bsize = linux_stat->f_bsize; 311 tmp_stat.f_blocks = linux_stat->f_blocks; 312 tmp_stat.f_bfree = linux_stat->f_bfree; 313 tmp_stat.f_bavail = linux_stat->f_bavail; 314 tmp_stat.f_files = linux_stat->f_files; 315 tmp_stat.f_ffree = linux_stat->f_ffree; 316 tmp_stat.f_fsid = linux_stat->f_fsid; 317 if (bufsiz > sizeof(tmp_stat)) 318 bufsiz = sizeof(tmp_stat); 319 return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0; 320 } 321 322 static int 323 linux_to_osf_statfs64(struct kstatfs *linux_stat, struct osf_statfs64 __user *osf_stat, 324 unsigned long bufsiz) 325 { 326 struct osf_statfs64 tmp_stat = { 0 }; 327 328 tmp_stat.f_type = linux_stat->f_type; 329 tmp_stat.f_fsize = linux_stat->f_frsize; 330 tmp_stat.f_bsize = linux_stat->f_bsize; 331 tmp_stat.f_blocks = linux_stat->f_blocks; 332 tmp_stat.f_bfree = linux_stat->f_bfree; 333 tmp_stat.f_bavail = linux_stat->f_bavail; 334 tmp_stat.f_files = linux_stat->f_files; 335 tmp_stat.f_ffree = linux_stat->f_ffree; 336 tmp_stat.f_fsid = linux_stat->f_fsid; 337 if (bufsiz > sizeof(tmp_stat)) 338 bufsiz = sizeof(tmp_stat); 339 return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0; 340 } 341 342 SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname, 343 struct osf_statfs __user *, buffer, unsigned long, bufsiz) 344 { 345 struct kstatfs linux_stat; 346 int error = user_statfs(pathname, &linux_stat); 347 if (!error) 348 error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz); 349 return error; 350 } 351 352 SYSCALL_DEFINE2(osf_stat, char __user *, name, struct osf_stat __user *, buf) 353 { 354 struct kstat stat; 355 int error; 356 357 error = vfs_stat(name, &stat); 358 if (error) 359 return error; 360 361 return linux_to_osf_stat(&stat, buf); 362 } 363 364 SYSCALL_DEFINE2(osf_lstat, char __user *, name, struct osf_stat __user *, buf) 365 { 366 struct kstat stat; 367 int error; 368 369 error = vfs_lstat(name, &stat); 370 if (error) 371 return error; 372 373 return linux_to_osf_stat(&stat, buf); 374 } 375 376 SYSCALL_DEFINE2(osf_fstat, int, fd, struct osf_stat __user *, buf) 377 { 378 struct kstat stat; 379 int error; 380 381 error = vfs_fstat(fd, &stat); 382 if (error) 383 return error; 384 385 return linux_to_osf_stat(&stat, buf); 386 } 387 388 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd, 389 struct osf_statfs __user *, buffer, unsigned long, bufsiz) 390 { 391 struct kstatfs linux_stat; 392 int error = fd_statfs(fd, &linux_stat); 393 if (!error) 394 error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz); 395 return error; 396 } 397 398 SYSCALL_DEFINE3(osf_statfs64, char __user *, pathname, 399 struct osf_statfs64 __user *, buffer, unsigned long, bufsiz) 400 { 401 struct kstatfs linux_stat; 402 int error = user_statfs(pathname, &linux_stat); 403 if (!error) 404 error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz); 405 return error; 406 } 407 408 SYSCALL_DEFINE3(osf_fstatfs64, unsigned long, fd, 409 struct osf_statfs64 __user *, buffer, unsigned long, bufsiz) 410 { 411 struct kstatfs linux_stat; 412 int error = fd_statfs(fd, &linux_stat); 413 if (!error) 414 error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz); 415 return error; 416 } 417 418 /* 419 * Uhh.. OSF/1 mount parameters aren't exactly obvious.. 420 * 421 * Although to be frank, neither are the native Linux/i386 ones.. 422 */ 423 struct ufs_args { 424 char __user *devname; 425 int flags; 426 uid_t exroot; 427 }; 428 429 struct cdfs_args { 430 char __user *devname; 431 int flags; 432 uid_t exroot; 433 434 /* This has lots more here, which Linux handles with the option block 435 but I'm too lazy to do the translation into ASCII. */ 436 }; 437 438 struct procfs_args { 439 char __user *devname; 440 int flags; 441 uid_t exroot; 442 }; 443 444 /* 445 * We can't actually handle ufs yet, so we translate UFS mounts to 446 * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS 447 * layout is so braindead it's a major headache doing it. 448 * 449 * Just how long ago was it written? OTOH our UFS driver may be still 450 * unhappy with OSF UFS. [CHECKME] 451 */ 452 static int 453 osf_ufs_mount(const char __user *dirname, 454 struct ufs_args __user *args, int flags) 455 { 456 int retval; 457 struct cdfs_args tmp; 458 struct filename *devname; 459 460 retval = -EFAULT; 461 if (copy_from_user(&tmp, args, sizeof(tmp))) 462 goto out; 463 devname = getname(tmp.devname); 464 retval = PTR_ERR(devname); 465 if (IS_ERR(devname)) 466 goto out; 467 retval = do_mount(devname->name, dirname, "ext2", flags, NULL); 468 putname(devname); 469 out: 470 return retval; 471 } 472 473 static int 474 osf_cdfs_mount(const char __user *dirname, 475 struct cdfs_args __user *args, int flags) 476 { 477 int retval; 478 struct cdfs_args tmp; 479 struct filename *devname; 480 481 retval = -EFAULT; 482 if (copy_from_user(&tmp, args, sizeof(tmp))) 483 goto out; 484 devname = getname(tmp.devname); 485 retval = PTR_ERR(devname); 486 if (IS_ERR(devname)) 487 goto out; 488 retval = do_mount(devname->name, dirname, "iso9660", flags, NULL); 489 putname(devname); 490 out: 491 return retval; 492 } 493 494 static int 495 osf_procfs_mount(const char __user *dirname, 496 struct procfs_args __user *args, int flags) 497 { 498 struct procfs_args tmp; 499 500 if (copy_from_user(&tmp, args, sizeof(tmp))) 501 return -EFAULT; 502 503 return do_mount("", dirname, "proc", flags, NULL); 504 } 505 506 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path, 507 int, flag, void __user *, data) 508 { 509 int retval; 510 511 switch (typenr) { 512 case 1: 513 retval = osf_ufs_mount(path, data, flag); 514 break; 515 case 6: 516 retval = osf_cdfs_mount(path, data, flag); 517 break; 518 case 9: 519 retval = osf_procfs_mount(path, data, flag); 520 break; 521 default: 522 retval = -EINVAL; 523 printk("osf_mount(%ld, %x)\n", typenr, flag); 524 } 525 526 return retval; 527 } 528 529 SYSCALL_DEFINE1(osf_utsname, char __user *, name) 530 { 531 int error; 532 533 down_read(&uts_sem); 534 error = -EFAULT; 535 if (copy_to_user(name + 0, utsname()->sysname, 32)) 536 goto out; 537 if (copy_to_user(name + 32, utsname()->nodename, 32)) 538 goto out; 539 if (copy_to_user(name + 64, utsname()->release, 32)) 540 goto out; 541 if (copy_to_user(name + 96, utsname()->version, 32)) 542 goto out; 543 if (copy_to_user(name + 128, utsname()->machine, 32)) 544 goto out; 545 546 error = 0; 547 out: 548 up_read(&uts_sem); 549 return error; 550 } 551 552 SYSCALL_DEFINE0(getpagesize) 553 { 554 return PAGE_SIZE; 555 } 556 557 SYSCALL_DEFINE0(getdtablesize) 558 { 559 return sysctl_nr_open; 560 } 561 562 /* 563 * For compatibility with OSF/1 only. Use utsname(2) instead. 564 */ 565 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen) 566 { 567 unsigned len; 568 int i; 569 570 if (!access_ok(VERIFY_WRITE, name, namelen)) 571 return -EFAULT; 572 573 len = namelen; 574 if (len > 32) 575 len = 32; 576 577 down_read(&uts_sem); 578 for (i = 0; i < len; ++i) { 579 __put_user(utsname()->domainname[i], name + i); 580 if (utsname()->domainname[i] == '\0') 581 break; 582 } 583 up_read(&uts_sem); 584 585 return 0; 586 } 587 588 /* 589 * The following stuff should move into a header file should it ever 590 * be labeled "officially supported." Right now, there is just enough 591 * support to avoid applications (such as tar) printing error 592 * messages. The attributes are not really implemented. 593 */ 594 595 /* 596 * Values for Property list entry flag 597 */ 598 #define PLE_PROPAGATE_ON_COPY 0x1 /* cp(1) will copy entry 599 by default */ 600 #define PLE_FLAG_MASK 0x1 /* Valid flag values */ 601 #define PLE_FLAG_ALL -1 /* All flag value */ 602 603 struct proplistname_args { 604 unsigned int pl_mask; 605 unsigned int pl_numnames; 606 char **pl_names; 607 }; 608 609 union pl_args { 610 struct setargs { 611 char __user *path; 612 long follow; 613 long nbytes; 614 char __user *buf; 615 } set; 616 struct fsetargs { 617 long fd; 618 long nbytes; 619 char __user *buf; 620 } fset; 621 struct getargs { 622 char __user *path; 623 long follow; 624 struct proplistname_args __user *name_args; 625 long nbytes; 626 char __user *buf; 627 int __user *min_buf_size; 628 } get; 629 struct fgetargs { 630 long fd; 631 struct proplistname_args __user *name_args; 632 long nbytes; 633 char __user *buf; 634 int __user *min_buf_size; 635 } fget; 636 struct delargs { 637 char __user *path; 638 long follow; 639 struct proplistname_args __user *name_args; 640 } del; 641 struct fdelargs { 642 long fd; 643 struct proplistname_args __user *name_args; 644 } fdel; 645 }; 646 647 enum pl_code { 648 PL_SET = 1, PL_FSET = 2, 649 PL_GET = 3, PL_FGET = 4, 650 PL_DEL = 5, PL_FDEL = 6 651 }; 652 653 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code, 654 union pl_args __user *, args) 655 { 656 long error; 657 int __user *min_buf_size_ptr; 658 659 switch (code) { 660 case PL_SET: 661 if (get_user(error, &args->set.nbytes)) 662 error = -EFAULT; 663 break; 664 case PL_FSET: 665 if (get_user(error, &args->fset.nbytes)) 666 error = -EFAULT; 667 break; 668 case PL_GET: 669 error = get_user(min_buf_size_ptr, &args->get.min_buf_size); 670 if (error) 671 break; 672 error = put_user(0, min_buf_size_ptr); 673 break; 674 case PL_FGET: 675 error = get_user(min_buf_size_ptr, &args->fget.min_buf_size); 676 if (error) 677 break; 678 error = put_user(0, min_buf_size_ptr); 679 break; 680 case PL_DEL: 681 case PL_FDEL: 682 error = 0; 683 break; 684 default: 685 error = -EOPNOTSUPP; 686 break; 687 }; 688 return error; 689 } 690 691 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss, 692 struct sigstack __user *, uoss) 693 { 694 unsigned long usp = rdusp(); 695 unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size; 696 unsigned long oss_os = on_sig_stack(usp); 697 int error; 698 699 if (uss) { 700 void __user *ss_sp; 701 702 error = -EFAULT; 703 if (get_user(ss_sp, &uss->ss_sp)) 704 goto out; 705 706 /* If the current stack was set with sigaltstack, don't 707 swap stacks while we are on it. */ 708 error = -EPERM; 709 if (current->sas_ss_sp && on_sig_stack(usp)) 710 goto out; 711 712 /* Since we don't know the extent of the stack, and we don't 713 track onstack-ness, but rather calculate it, we must 714 presume a size. Ho hum this interface is lossy. */ 715 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ; 716 current->sas_ss_size = SIGSTKSZ; 717 } 718 719 if (uoss) { 720 error = -EFAULT; 721 if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)) 722 || __put_user(oss_sp, &uoss->ss_sp) 723 || __put_user(oss_os, &uoss->ss_onstack)) 724 goto out; 725 } 726 727 error = 0; 728 out: 729 return error; 730 } 731 732 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count) 733 { 734 const char *sysinfo_table[] = { 735 utsname()->sysname, 736 utsname()->nodename, 737 utsname()->release, 738 utsname()->version, 739 utsname()->machine, 740 "alpha", /* instruction set architecture */ 741 "dummy", /* hardware serial number */ 742 "dummy", /* hardware manufacturer */ 743 "dummy", /* secure RPC domain */ 744 }; 745 unsigned long offset; 746 const char *res; 747 long len, err = -EINVAL; 748 749 offset = command-1; 750 if (offset >= ARRAY_SIZE(sysinfo_table)) { 751 /* Digital UNIX has a few unpublished interfaces here */ 752 printk("sysinfo(%d)", command); 753 goto out; 754 } 755 756 down_read(&uts_sem); 757 res = sysinfo_table[offset]; 758 len = strlen(res)+1; 759 if ((unsigned long)len > (unsigned long)count) 760 len = count; 761 if (copy_to_user(buf, res, len)) 762 err = -EFAULT; 763 else 764 err = 0; 765 up_read(&uts_sem); 766 out: 767 return err; 768 } 769 770 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer, 771 unsigned long, nbytes, int __user *, start, void __user *, arg) 772 { 773 unsigned long w; 774 struct percpu_struct *cpu; 775 776 switch (op) { 777 case GSI_IEEE_FP_CONTROL: 778 /* Return current software fp control & status bits. */ 779 /* Note that DU doesn't verify available space here. */ 780 781 w = current_thread_info()->ieee_state & IEEE_SW_MASK; 782 w = swcr_update_status(w, rdfpcr()); 783 if (put_user(w, (unsigned long __user *) buffer)) 784 return -EFAULT; 785 return 0; 786 787 case GSI_IEEE_STATE_AT_SIGNAL: 788 /* 789 * Not sure anybody will ever use this weird stuff. These 790 * ops can be used (under OSF/1) to set the fpcr that should 791 * be used when a signal handler starts executing. 792 */ 793 break; 794 795 case GSI_UACPROC: 796 if (nbytes < sizeof(unsigned int)) 797 return -EINVAL; 798 w = current_thread_info()->status & UAC_BITMASK; 799 if (put_user(w, (unsigned int __user *)buffer)) 800 return -EFAULT; 801 return 1; 802 803 case GSI_PROC_TYPE: 804 if (nbytes < sizeof(unsigned long)) 805 return -EINVAL; 806 cpu = (struct percpu_struct*) 807 ((char*)hwrpb + hwrpb->processor_offset); 808 w = cpu->type; 809 if (put_user(w, (unsigned long __user*)buffer)) 810 return -EFAULT; 811 return 1; 812 813 case GSI_GET_HWRPB: 814 if (nbytes > sizeof(*hwrpb)) 815 return -EINVAL; 816 if (copy_to_user(buffer, hwrpb, nbytes) != 0) 817 return -EFAULT; 818 return 1; 819 820 default: 821 break; 822 } 823 824 return -EOPNOTSUPP; 825 } 826 827 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer, 828 unsigned long, nbytes, int __user *, start, void __user *, arg) 829 { 830 switch (op) { 831 case SSI_IEEE_FP_CONTROL: { 832 unsigned long swcr, fpcr; 833 unsigned int *state; 834 835 /* 836 * Alpha Architecture Handbook 4.7.7.3: 837 * To be fully IEEE compiant, we must track the current IEEE 838 * exception state in software, because spurious bits can be 839 * set in the trap shadow of a software-complete insn. 840 */ 841 842 if (get_user(swcr, (unsigned long __user *)buffer)) 843 return -EFAULT; 844 state = ¤t_thread_info()->ieee_state; 845 846 /* Update softare trap enable bits. */ 847 *state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK); 848 849 /* Update the real fpcr. */ 850 fpcr = rdfpcr() & FPCR_DYN_MASK; 851 fpcr |= ieee_swcr_to_fpcr(swcr); 852 wrfpcr(fpcr); 853 854 return 0; 855 } 856 857 case SSI_IEEE_RAISE_EXCEPTION: { 858 unsigned long exc, swcr, fpcr, fex; 859 unsigned int *state; 860 861 if (get_user(exc, (unsigned long __user *)buffer)) 862 return -EFAULT; 863 state = ¤t_thread_info()->ieee_state; 864 exc &= IEEE_STATUS_MASK; 865 866 /* Update softare trap enable bits. */ 867 swcr = (*state & IEEE_SW_MASK) | exc; 868 *state |= exc; 869 870 /* Update the real fpcr. */ 871 fpcr = rdfpcr(); 872 fpcr |= ieee_swcr_to_fpcr(swcr); 873 wrfpcr(fpcr); 874 875 /* If any exceptions set by this call, and are unmasked, 876 send a signal. Old exceptions are not signaled. */ 877 fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr; 878 if (fex) { 879 siginfo_t info; 880 int si_code = 0; 881 882 if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND; 883 if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES; 884 if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND; 885 if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF; 886 if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV; 887 if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV; 888 889 info.si_signo = SIGFPE; 890 info.si_errno = 0; 891 info.si_code = si_code; 892 info.si_addr = NULL; /* FIXME */ 893 send_sig_info(SIGFPE, &info, current); 894 } 895 return 0; 896 } 897 898 case SSI_IEEE_STATE_AT_SIGNAL: 899 case SSI_IEEE_IGNORE_STATE_AT_SIGNAL: 900 /* 901 * Not sure anybody will ever use this weird stuff. These 902 * ops can be used (under OSF/1) to set the fpcr that should 903 * be used when a signal handler starts executing. 904 */ 905 break; 906 907 case SSI_NVPAIRS: { 908 unsigned __user *p = buffer; 909 unsigned i; 910 911 for (i = 0, p = buffer; i < nbytes; ++i, p += 2) { 912 unsigned v, w, status; 913 914 if (get_user(v, p) || get_user(w, p + 1)) 915 return -EFAULT; 916 switch (v) { 917 case SSIN_UACPROC: 918 w &= UAC_BITMASK; 919 status = current_thread_info()->status; 920 status = (status & ~UAC_BITMASK) | w; 921 current_thread_info()->status = status; 922 break; 923 924 default: 925 return -EOPNOTSUPP; 926 } 927 } 928 return 0; 929 } 930 931 case SSI_LMF: 932 return 0; 933 934 default: 935 break; 936 } 937 938 return -EOPNOTSUPP; 939 } 940 941 /* Translations due to the fact that OSF's time_t is an int. Which 942 affects all sorts of things, like timeval and itimerval. */ 943 944 extern struct timezone sys_tz; 945 946 struct timeval32 947 { 948 int tv_sec, tv_usec; 949 }; 950 951 struct itimerval32 952 { 953 struct timeval32 it_interval; 954 struct timeval32 it_value; 955 }; 956 957 static inline long 958 get_tv32(struct timeval *o, struct timeval32 __user *i) 959 { 960 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 961 (__get_user(o->tv_sec, &i->tv_sec) | 962 __get_user(o->tv_usec, &i->tv_usec))); 963 } 964 965 static inline long 966 put_tv32(struct timeval32 __user *o, struct timeval *i) 967 { 968 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 969 (__put_user(i->tv_sec, &o->tv_sec) | 970 __put_user(i->tv_usec, &o->tv_usec))); 971 } 972 973 static inline long 974 get_it32(struct itimerval *o, struct itimerval32 __user *i) 975 { 976 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 977 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 978 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 979 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 980 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 981 } 982 983 static inline long 984 put_it32(struct itimerval32 __user *o, struct itimerval *i) 985 { 986 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 987 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 988 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 989 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 990 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 991 } 992 993 static inline void 994 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value) 995 { 996 value->tv_usec = (jiffies % HZ) * (1000000L / HZ); 997 value->tv_sec = jiffies / HZ; 998 } 999 1000 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv, 1001 struct timezone __user *, tz) 1002 { 1003 if (tv) { 1004 struct timeval ktv; 1005 do_gettimeofday(&ktv); 1006 if (put_tv32(tv, &ktv)) 1007 return -EFAULT; 1008 } 1009 if (tz) { 1010 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 1011 return -EFAULT; 1012 } 1013 return 0; 1014 } 1015 1016 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv, 1017 struct timezone __user *, tz) 1018 { 1019 struct timespec kts; 1020 struct timezone ktz; 1021 1022 if (tv) { 1023 if (get_tv32((struct timeval *)&kts, tv)) 1024 return -EFAULT; 1025 kts.tv_nsec *= 1000; 1026 } 1027 if (tz) { 1028 if (copy_from_user(&ktz, tz, sizeof(*tz))) 1029 return -EFAULT; 1030 } 1031 1032 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 1033 } 1034 1035 asmlinkage long sys_ni_posix_timers(void); 1036 1037 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it) 1038 { 1039 struct itimerval kit; 1040 int error; 1041 1042 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 1043 return sys_ni_posix_timers(); 1044 1045 error = do_getitimer(which, &kit); 1046 if (!error && put_it32(it, &kit)) 1047 error = -EFAULT; 1048 1049 return error; 1050 } 1051 1052 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in, 1053 struct itimerval32 __user *, out) 1054 { 1055 struct itimerval kin, kout; 1056 int error; 1057 1058 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 1059 return sys_ni_posix_timers(); 1060 1061 if (in) { 1062 if (get_it32(&kin, in)) 1063 return -EFAULT; 1064 } else 1065 memset(&kin, 0, sizeof(kin)); 1066 1067 error = do_setitimer(which, &kin, out ? &kout : NULL); 1068 if (error || !out) 1069 return error; 1070 1071 if (put_it32(out, &kout)) 1072 return -EFAULT; 1073 1074 return 0; 1075 1076 } 1077 1078 SYSCALL_DEFINE2(osf_utimes, const char __user *, filename, 1079 struct timeval32 __user *, tvs) 1080 { 1081 struct timespec tv[2]; 1082 1083 if (tvs) { 1084 struct timeval ktvs[2]; 1085 if (get_tv32(&ktvs[0], &tvs[0]) || 1086 get_tv32(&ktvs[1], &tvs[1])) 1087 return -EFAULT; 1088 1089 if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 || 1090 ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000) 1091 return -EINVAL; 1092 1093 tv[0].tv_sec = ktvs[0].tv_sec; 1094 tv[0].tv_nsec = 1000 * ktvs[0].tv_usec; 1095 tv[1].tv_sec = ktvs[1].tv_sec; 1096 tv[1].tv_nsec = 1000 * ktvs[1].tv_usec; 1097 } 1098 1099 return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0); 1100 } 1101 1102 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp, 1103 fd_set __user *, exp, struct timeval32 __user *, tvp) 1104 { 1105 struct timespec end_time, *to = NULL; 1106 if (tvp) { 1107 time_t sec, usec; 1108 1109 to = &end_time; 1110 1111 if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp)) 1112 || __get_user(sec, &tvp->tv_sec) 1113 || __get_user(usec, &tvp->tv_usec)) { 1114 return -EFAULT; 1115 } 1116 1117 if (sec < 0 || usec < 0) 1118 return -EINVAL; 1119 1120 if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC)) 1121 return -EINVAL; 1122 1123 } 1124 1125 /* OSF does not copy back the remaining time. */ 1126 return core_sys_select(n, inp, outp, exp, to); 1127 } 1128 1129 struct rusage32 { 1130 struct timeval32 ru_utime; /* user time used */ 1131 struct timeval32 ru_stime; /* system time used */ 1132 long ru_maxrss; /* maximum resident set size */ 1133 long ru_ixrss; /* integral shared memory size */ 1134 long ru_idrss; /* integral unshared data size */ 1135 long ru_isrss; /* integral unshared stack size */ 1136 long ru_minflt; /* page reclaims */ 1137 long ru_majflt; /* page faults */ 1138 long ru_nswap; /* swaps */ 1139 long ru_inblock; /* block input operations */ 1140 long ru_oublock; /* block output operations */ 1141 long ru_msgsnd; /* messages sent */ 1142 long ru_msgrcv; /* messages received */ 1143 long ru_nsignals; /* signals received */ 1144 long ru_nvcsw; /* voluntary context switches */ 1145 long ru_nivcsw; /* involuntary " */ 1146 }; 1147 1148 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru) 1149 { 1150 struct rusage32 r; 1151 u64 utime, stime; 1152 unsigned long utime_jiffies, stime_jiffies; 1153 1154 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN) 1155 return -EINVAL; 1156 1157 memset(&r, 0, sizeof(r)); 1158 switch (who) { 1159 case RUSAGE_SELF: 1160 task_cputime(current, &utime, &stime); 1161 utime_jiffies = nsecs_to_jiffies(utime); 1162 stime_jiffies = nsecs_to_jiffies(stime); 1163 jiffies_to_timeval32(utime_jiffies, &r.ru_utime); 1164 jiffies_to_timeval32(stime_jiffies, &r.ru_stime); 1165 r.ru_minflt = current->min_flt; 1166 r.ru_majflt = current->maj_flt; 1167 break; 1168 case RUSAGE_CHILDREN: 1169 utime_jiffies = nsecs_to_jiffies(current->signal->cutime); 1170 stime_jiffies = nsecs_to_jiffies(current->signal->cstime); 1171 jiffies_to_timeval32(utime_jiffies, &r.ru_utime); 1172 jiffies_to_timeval32(stime_jiffies, &r.ru_stime); 1173 r.ru_minflt = current->signal->cmin_flt; 1174 r.ru_majflt = current->signal->cmaj_flt; 1175 break; 1176 } 1177 1178 return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; 1179 } 1180 1181 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options, 1182 struct rusage32 __user *, ur) 1183 { 1184 struct rusage r; 1185 long ret, err; 1186 unsigned int status = 0; 1187 mm_segment_t old_fs; 1188 1189 if (!ur) 1190 return sys_wait4(pid, ustatus, options, NULL); 1191 1192 old_fs = get_fs(); 1193 1194 set_fs (KERNEL_DS); 1195 ret = sys_wait4(pid, (unsigned int __user *) &status, options, 1196 (struct rusage __user *) &r); 1197 set_fs (old_fs); 1198 1199 if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur))) 1200 return -EFAULT; 1201 1202 err = 0; 1203 err |= put_user(status, ustatus); 1204 err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec); 1205 err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec); 1206 err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec); 1207 err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec); 1208 err |= __put_user(r.ru_maxrss, &ur->ru_maxrss); 1209 err |= __put_user(r.ru_ixrss, &ur->ru_ixrss); 1210 err |= __put_user(r.ru_idrss, &ur->ru_idrss); 1211 err |= __put_user(r.ru_isrss, &ur->ru_isrss); 1212 err |= __put_user(r.ru_minflt, &ur->ru_minflt); 1213 err |= __put_user(r.ru_majflt, &ur->ru_majflt); 1214 err |= __put_user(r.ru_nswap, &ur->ru_nswap); 1215 err |= __put_user(r.ru_inblock, &ur->ru_inblock); 1216 err |= __put_user(r.ru_oublock, &ur->ru_oublock); 1217 err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd); 1218 err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv); 1219 err |= __put_user(r.ru_nsignals, &ur->ru_nsignals); 1220 err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw); 1221 err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw); 1222 1223 return err ? err : ret; 1224 } 1225 1226 /* 1227 * I don't know what the parameters are: the first one 1228 * seems to be a timeval pointer, and I suspect the second 1229 * one is the time remaining.. Ho humm.. No documentation. 1230 */ 1231 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep, 1232 struct timeval32 __user *, remain) 1233 { 1234 struct timeval tmp; 1235 unsigned long ticks; 1236 1237 if (get_tv32(&tmp, sleep)) 1238 goto fault; 1239 1240 ticks = timeval_to_jiffies(&tmp); 1241 1242 ticks = schedule_timeout_interruptible(ticks); 1243 1244 if (remain) { 1245 jiffies_to_timeval(ticks, &tmp); 1246 if (put_tv32(remain, &tmp)) 1247 goto fault; 1248 } 1249 1250 return 0; 1251 fault: 1252 return -EFAULT; 1253 } 1254 1255 1256 struct timex32 { 1257 unsigned int modes; /* mode selector */ 1258 long offset; /* time offset (usec) */ 1259 long freq; /* frequency offset (scaled ppm) */ 1260 long maxerror; /* maximum error (usec) */ 1261 long esterror; /* estimated error (usec) */ 1262 int status; /* clock command/status */ 1263 long constant; /* pll time constant */ 1264 long precision; /* clock precision (usec) (read only) */ 1265 long tolerance; /* clock frequency tolerance (ppm) 1266 * (read only) 1267 */ 1268 struct timeval32 time; /* (read only) */ 1269 long tick; /* (modified) usecs between clock ticks */ 1270 1271 long ppsfreq; /* pps frequency (scaled ppm) (ro) */ 1272 long jitter; /* pps jitter (us) (ro) */ 1273 int shift; /* interval duration (s) (shift) (ro) */ 1274 long stabil; /* pps stability (scaled ppm) (ro) */ 1275 long jitcnt; /* jitter limit exceeded (ro) */ 1276 long calcnt; /* calibration intervals (ro) */ 1277 long errcnt; /* calibration errors (ro) */ 1278 long stbcnt; /* stability limit exceeded (ro) */ 1279 1280 int :32; int :32; int :32; int :32; 1281 int :32; int :32; int :32; int :32; 1282 int :32; int :32; int :32; int :32; 1283 }; 1284 1285 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p) 1286 { 1287 struct timex txc; 1288 int ret; 1289 1290 /* copy relevant bits of struct timex. */ 1291 if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) || 1292 copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) - 1293 offsetof(struct timex32, tick))) 1294 return -EFAULT; 1295 1296 ret = do_adjtimex(&txc); 1297 if (ret < 0) 1298 return ret; 1299 1300 /* copy back to timex32 */ 1301 if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) || 1302 (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) - 1303 offsetof(struct timex32, tick))) || 1304 (put_tv32(&txc_p->time, &txc.time))) 1305 return -EFAULT; 1306 1307 return ret; 1308 } 1309 1310 /* Get an address range which is currently unmapped. Similar to the 1311 generic version except that we know how to honor ADDR_LIMIT_32BIT. */ 1312 1313 static unsigned long 1314 arch_get_unmapped_area_1(unsigned long addr, unsigned long len, 1315 unsigned long limit) 1316 { 1317 struct vm_unmapped_area_info info; 1318 1319 info.flags = 0; 1320 info.length = len; 1321 info.low_limit = addr; 1322 info.high_limit = limit; 1323 info.align_mask = 0; 1324 info.align_offset = 0; 1325 return vm_unmapped_area(&info); 1326 } 1327 1328 unsigned long 1329 arch_get_unmapped_area(struct file *filp, unsigned long addr, 1330 unsigned long len, unsigned long pgoff, 1331 unsigned long flags) 1332 { 1333 unsigned long limit; 1334 1335 /* "32 bit" actually means 31 bit, since pointers sign extend. */ 1336 if (current->personality & ADDR_LIMIT_32BIT) 1337 limit = 0x80000000; 1338 else 1339 limit = TASK_SIZE; 1340 1341 if (len > limit) 1342 return -ENOMEM; 1343 1344 if (flags & MAP_FIXED) 1345 return addr; 1346 1347 /* First, see if the given suggestion fits. 1348 1349 The OSF/1 loader (/sbin/loader) relies on us returning an 1350 address larger than the requested if one exists, which is 1351 a terribly broken way to program. 1352 1353 That said, I can see the use in being able to suggest not 1354 merely specific addresses, but regions of memory -- perhaps 1355 this feature should be incorporated into all ports? */ 1356 1357 if (addr) { 1358 addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit); 1359 if (addr != (unsigned long) -ENOMEM) 1360 return addr; 1361 } 1362 1363 /* Next, try allocating at TASK_UNMAPPED_BASE. */ 1364 addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE), 1365 len, limit); 1366 if (addr != (unsigned long) -ENOMEM) 1367 return addr; 1368 1369 /* Finally, try allocating in low memory. */ 1370 addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit); 1371 1372 return addr; 1373 } 1374 1375 #ifdef CONFIG_OSF4_COMPAT 1376 1377 /* Clear top 32 bits of iov_len in the user's buffer for 1378 compatibility with old versions of OSF/1 where iov_len 1379 was defined as int. */ 1380 static int 1381 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count) 1382 { 1383 unsigned long i; 1384 1385 for (i = 0 ; i < count ; i++) { 1386 int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1; 1387 1388 if (put_user(0, iov_len_high)) 1389 return -EFAULT; 1390 } 1391 return 0; 1392 } 1393 1394 SYSCALL_DEFINE3(osf_readv, unsigned long, fd, 1395 const struct iovec __user *, vector, unsigned long, count) 1396 { 1397 if (unlikely(personality(current->personality) == PER_OSF4)) 1398 if (osf_fix_iov_len(vector, count)) 1399 return -EFAULT; 1400 return sys_readv(fd, vector, count); 1401 } 1402 1403 SYSCALL_DEFINE3(osf_writev, unsigned long, fd, 1404 const struct iovec __user *, vector, unsigned long, count) 1405 { 1406 if (unlikely(personality(current->personality) == PER_OSF4)) 1407 if (osf_fix_iov_len(vector, count)) 1408 return -EFAULT; 1409 return sys_writev(fd, vector, count); 1410 } 1411 1412 #endif 1413 1414 SYSCALL_DEFINE2(osf_getpriority, int, which, int, who) 1415 { 1416 int prio = sys_getpriority(which, who); 1417 if (prio >= 0) { 1418 /* Return value is the unbiased priority, i.e. 20 - prio. 1419 This does result in negative return values, so signal 1420 no error */ 1421 force_successful_syscall_return(); 1422 prio = 20 - prio; 1423 } 1424 return prio; 1425 } 1426 1427 SYSCALL_DEFINE0(getxuid) 1428 { 1429 current_pt_regs()->r20 = sys_geteuid(); 1430 return sys_getuid(); 1431 } 1432 1433 SYSCALL_DEFINE0(getxgid) 1434 { 1435 current_pt_regs()->r20 = sys_getegid(); 1436 return sys_getgid(); 1437 } 1438 1439 SYSCALL_DEFINE0(getxpid) 1440 { 1441 current_pt_regs()->r20 = sys_getppid(); 1442 return sys_getpid(); 1443 } 1444 1445 SYSCALL_DEFINE0(alpha_pipe) 1446 { 1447 int fd[2]; 1448 int res = do_pipe_flags(fd, 0); 1449 if (!res) { 1450 /* The return values are in $0 and $20. */ 1451 current_pt_regs()->r20 = fd[1]; 1452 res = fd[0]; 1453 } 1454 return res; 1455 } 1456 1457 SYSCALL_DEFINE1(sethae, unsigned long, val) 1458 { 1459 current_pt_regs()->hae = val; 1460 return 0; 1461 } 1462