1 /*- 2 * Copyright (c) 1994-1995 S�ren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software withough specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include "opt_compat.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/sysproto.h> 36 #include <sys/kernel.h> 37 #include <sys/mman.h> 38 #include <sys/proc.h> 39 #include <sys/fcntl.h> 40 #include <sys/imgact_aout.h> 41 #include <sys/mount.h> 42 #include <sys/namei.h> 43 #include <sys/resourcevar.h> 44 #include <sys/stat.h> 45 #include <sys/sysctl.h> 46 #include <sys/unistd.h> 47 #include <sys/vnode.h> 48 #include <sys/wait.h> 49 #include <sys/time.h> 50 #include <sys/signalvar.h> 51 52 #include <vm/vm.h> 53 #include <vm/pmap.h> 54 #include <vm/vm_kern.h> 55 #include <vm/vm_map.h> 56 #include <vm/vm_extern.h> 57 58 #include <machine/frame.h> 59 #include <machine/psl.h> 60 #include <machine/sysarch.h> 61 #include <machine/segments.h> 62 63 #include <i386/linux/linux.h> 64 #include <i386/linux/linux_proto.h> 65 #include <i386/linux/linux_util.h> 66 #include <i386/linux/linux_mib.h> 67 68 #include <posix4/sched.h> 69 70 #define BSD_TO_LINUX_SIGNAL(sig) \ 71 (((sig) <= LINUX_SIGTBLSZ) ? bsd_to_linux_signal[_SIG_IDX(sig)] : sig) 72 73 static unsigned int linux_to_bsd_resource[LINUX_RLIM_NLIMITS] = 74 { RLIMIT_CPU, RLIMIT_FSIZE, RLIMIT_DATA, RLIMIT_STACK, 75 RLIMIT_CORE, RLIMIT_RSS, RLIMIT_NPROC, RLIMIT_NOFILE, 76 RLIMIT_MEMLOCK, -1 77 }; 78 79 int 80 linux_alarm(struct proc *p, struct linux_alarm_args *args) 81 { 82 struct itimerval it, old_it; 83 struct timeval tv; 84 int s; 85 86 #ifdef DEBUG 87 printf("Linux-emul(%ld): alarm(%u)\n", (long)p->p_pid, args->secs); 88 #endif 89 if (args->secs > 100000000) 90 return EINVAL; 91 it.it_value.tv_sec = (long)args->secs; 92 it.it_value.tv_usec = 0; 93 it.it_interval.tv_sec = 0; 94 it.it_interval.tv_usec = 0; 95 s = splsoftclock(); 96 old_it = p->p_realtimer; 97 getmicrouptime(&tv); 98 if (timevalisset(&old_it.it_value)) 99 untimeout(realitexpire, (caddr_t)p, p->p_ithandle); 100 if (it.it_value.tv_sec != 0) { 101 p->p_ithandle = timeout(realitexpire, (caddr_t)p, tvtohz(&it.it_value)); 102 timevaladd(&it.it_value, &tv); 103 } 104 p->p_realtimer = it; 105 splx(s); 106 if (timevalcmp(&old_it.it_value, &tv, >)) { 107 timevalsub(&old_it.it_value, &tv); 108 if (old_it.it_value.tv_usec != 0) 109 old_it.it_value.tv_sec++; 110 p->p_retval[0] = old_it.it_value.tv_sec; 111 } 112 return 0; 113 } 114 115 int 116 linux_brk(struct proc *p, struct linux_brk_args *args) 117 { 118 #if 0 119 struct vmspace *vm = p->p_vmspace; 120 vm_offset_t new, old; 121 int error; 122 123 if ((vm_offset_t)args->dsend < (vm_offset_t)vm->vm_daddr) 124 return EINVAL; 125 if (((caddr_t)args->dsend - (caddr_t)vm->vm_daddr) 126 > p->p_rlimit[RLIMIT_DATA].rlim_cur) 127 return ENOMEM; 128 129 old = round_page((vm_offset_t)vm->vm_daddr) + ctob(vm->vm_dsize); 130 new = round_page((vm_offset_t)args->dsend); 131 p->p_retval[0] = old; 132 if ((new-old) > 0) { 133 if (swap_pager_full) 134 return ENOMEM; 135 error = vm_map_find(&vm->vm_map, NULL, 0, &old, (new-old), FALSE, 136 VM_PROT_ALL, VM_PROT_ALL, 0); 137 if (error) 138 return error; 139 vm->vm_dsize += btoc((new-old)); 140 p->p_retval[0] = (int)(vm->vm_daddr + ctob(vm->vm_dsize)); 141 } 142 return 0; 143 #else 144 struct vmspace *vm = p->p_vmspace; 145 vm_offset_t new, old; 146 struct obreak_args /* { 147 char * nsize; 148 } */ tmp; 149 150 #ifdef DEBUG 151 printf("Linux-emul(%ld): brk(%p)\n", (long)p->p_pid, (void *)args->dsend); 152 #endif 153 old = (vm_offset_t)vm->vm_daddr + ctob(vm->vm_dsize); 154 new = (vm_offset_t)args->dsend; 155 tmp.nsize = (char *) new; 156 if (((caddr_t)new > vm->vm_daddr) && !obreak(p, &tmp)) 157 p->p_retval[0] = (int)new; 158 else 159 p->p_retval[0] = (int)old; 160 161 return 0; 162 #endif 163 } 164 165 int 166 linux_uselib(struct proc *p, struct linux_uselib_args *args) 167 { 168 struct nameidata ni; 169 struct vnode *vp; 170 struct exec *a_out; 171 struct vattr attr; 172 vm_offset_t vmaddr; 173 unsigned long file_offset; 174 vm_offset_t buffer; 175 unsigned long bss_size; 176 int error; 177 caddr_t sg; 178 int locked; 179 180 sg = stackgap_init(); 181 CHECKALTEXIST(p, &sg, args->library); 182 183 #ifdef DEBUG 184 printf("Linux-emul(%ld): uselib(%s)\n", (long)p->p_pid, args->library); 185 #endif 186 187 a_out = NULL; 188 locked = 0; 189 vp = NULL; 190 191 NDINIT(&ni, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, args->library, p); 192 error = namei(&ni); 193 if (error) 194 goto cleanup; 195 196 vp = ni.ni_vp; 197 /* 198 * XXX This looks like a bogus check - a LOCKLEAF namei should not succeed 199 * without returning a vnode. 200 */ 201 if (vp == NULL) { 202 error = ENOEXEC; /* ?? */ 203 goto cleanup; 204 } 205 NDFREE(&ni, NDF_ONLY_PNBUF); 206 207 /* 208 * From here on down, we have a locked vnode that must be unlocked. 209 */ 210 locked++; 211 212 /* 213 * Writable? 214 */ 215 if (vp->v_writecount) { 216 error = ETXTBSY; 217 goto cleanup; 218 } 219 220 /* 221 * Executable? 222 */ 223 error = VOP_GETATTR(vp, &attr, p->p_ucred, p); 224 if (error) 225 goto cleanup; 226 227 if ((vp->v_mount->mnt_flag & MNT_NOEXEC) || 228 ((attr.va_mode & 0111) == 0) || 229 (attr.va_type != VREG)) { 230 error = ENOEXEC; 231 goto cleanup; 232 } 233 234 /* 235 * Sensible size? 236 */ 237 if (attr.va_size == 0) { 238 error = ENOEXEC; 239 goto cleanup; 240 } 241 242 /* 243 * Can we access it? 244 */ 245 error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); 246 if (error) 247 goto cleanup; 248 249 error = VOP_OPEN(vp, FREAD, p->p_ucred, p); 250 if (error) 251 goto cleanup; 252 253 /* 254 * Lock no longer needed 255 */ 256 VOP_UNLOCK(vp, 0, p); 257 locked = 0; 258 259 /* 260 * Pull in executable header into kernel_map 261 */ 262 error = vm_mmap(kernel_map, (vm_offset_t *)&a_out, PAGE_SIZE, 263 VM_PROT_READ, VM_PROT_READ, 0, (caddr_t)vp, 0); 264 if (error) 265 goto cleanup; 266 267 /* 268 * Is it a Linux binary ? 269 */ 270 if (((a_out->a_magic >> 16) & 0xff) != 0x64) { 271 error = ENOEXEC; 272 goto cleanup; 273 } 274 275 /* While we are here, we should REALLY do some more checks */ 276 277 /* 278 * Set file/virtual offset based on a.out variant. 279 */ 280 switch ((int)(a_out->a_magic & 0xffff)) { 281 case 0413: /* ZMAGIC */ 282 file_offset = 1024; 283 break; 284 case 0314: /* QMAGIC */ 285 file_offset = 0; 286 break; 287 default: 288 error = ENOEXEC; 289 goto cleanup; 290 } 291 292 bss_size = round_page(a_out->a_bss); 293 294 /* 295 * Check various fields in header for validity/bounds. 296 */ 297 if (a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) { 298 error = ENOEXEC; 299 goto cleanup; 300 } 301 302 /* text + data can't exceed file size */ 303 if (a_out->a_data + a_out->a_text > attr.va_size) { 304 error = EFAULT; 305 goto cleanup; 306 } 307 308 /* 309 * text/data/bss must not exceed limits 310 * XXX: this is not complete. it should check current usage PLUS 311 * the resources needed by this library. 312 */ 313 if (a_out->a_text > MAXTSIZ || 314 a_out->a_data + bss_size > p->p_rlimit[RLIMIT_DATA].rlim_cur) { 315 error = ENOMEM; 316 goto cleanup; 317 } 318 319 /* 320 * prevent more writers 321 */ 322 vp->v_flag |= VTEXT; 323 324 /* 325 * Check if file_offset page aligned,. 326 * Currently we cannot handle misalinged file offsets, 327 * and so we read in the entire image (what a waste). 328 */ 329 if (file_offset & PAGE_MASK) { 330 #ifdef DEBUG 331 printf("uselib: Non page aligned binary %lu\n", file_offset); 332 #endif 333 /* 334 * Map text+data read/write/execute 335 */ 336 337 /* a_entry is the load address and is page aligned */ 338 vmaddr = trunc_page(a_out->a_entry); 339 340 /* get anon user mapping, read+write+execute */ 341 error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr, 342 a_out->a_text + a_out->a_data, FALSE, 343 VM_PROT_ALL, VM_PROT_ALL, 0); 344 if (error) 345 goto cleanup; 346 347 /* map file into kernel_map */ 348 error = vm_mmap(kernel_map, &buffer, 349 round_page(a_out->a_text + a_out->a_data + file_offset), 350 VM_PROT_READ, VM_PROT_READ, 0, 351 (caddr_t)vp, trunc_page(file_offset)); 352 if (error) 353 goto cleanup; 354 355 /* copy from kernel VM space to user space */ 356 error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset), 357 (caddr_t)vmaddr, a_out->a_text + a_out->a_data); 358 359 /* release temporary kernel space */ 360 vm_map_remove(kernel_map, buffer, 361 buffer + round_page(a_out->a_text + a_out->a_data + file_offset)); 362 363 if (error) 364 goto cleanup; 365 } 366 else { 367 #ifdef DEBUG 368 printf("uselib: Page aligned binary %lu\n", file_offset); 369 #endif 370 /* 371 * for QMAGIC, a_entry is 20 bytes beyond the load address 372 * to skip the executable header 373 */ 374 vmaddr = trunc_page(a_out->a_entry); 375 376 /* 377 * Map it all into the process's space as a single copy-on-write 378 * "data" segment. 379 */ 380 error = vm_mmap(&p->p_vmspace->vm_map, &vmaddr, 381 a_out->a_text + a_out->a_data, 382 VM_PROT_ALL, VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, 383 (caddr_t)vp, file_offset); 384 if (error) 385 goto cleanup; 386 } 387 #ifdef DEBUG 388 printf("mem=%08x = %08x %08x\n", vmaddr, ((int*)vmaddr)[0], ((int*)vmaddr)[1]); 389 #endif 390 if (bss_size != 0) { 391 /* 392 * Calculate BSS start address 393 */ 394 vmaddr = trunc_page(a_out->a_entry) + a_out->a_text + a_out->a_data; 395 396 /* 397 * allocate some 'anon' space 398 */ 399 error = vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &vmaddr, 400 bss_size, FALSE, 401 VM_PROT_ALL, VM_PROT_ALL, 0); 402 if (error) 403 goto cleanup; 404 } 405 406 cleanup: 407 /* 408 * Unlock vnode if needed 409 */ 410 if (locked) 411 VOP_UNLOCK(vp, 0, p); 412 413 /* 414 * Release the kernel mapping. 415 */ 416 if (a_out) 417 vm_map_remove(kernel_map, (vm_offset_t)a_out, (vm_offset_t)a_out + PAGE_SIZE); 418 419 return error; 420 } 421 422 /* XXX move */ 423 struct linux_select_argv { 424 int nfds; 425 fd_set *readfds; 426 fd_set *writefds; 427 fd_set *exceptfds; 428 struct timeval *timeout; 429 }; 430 431 int 432 linux_select(struct proc *p, struct linux_select_args *args) 433 { 434 struct linux_select_argv linux_args; 435 struct linux_newselect_args newsel; 436 int error; 437 438 #ifdef SELECT_DEBUG 439 printf("Linux-emul(%ld): select(%x)\n", (long)p->p_pid, args->ptr); 440 #endif 441 if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args, 442 sizeof(linux_args)))) 443 return error; 444 445 newsel.nfds = linux_args.nfds; 446 newsel.readfds = linux_args.readfds; 447 newsel.writefds = linux_args.writefds; 448 newsel.exceptfds = linux_args.exceptfds; 449 newsel.timeout = linux_args.timeout; 450 451 return linux_newselect(p, &newsel); 452 } 453 454 int 455 linux_newselect(struct proc *p, struct linux_newselect_args *args) 456 { 457 struct select_args bsa; 458 struct timeval tv0, tv1, utv, *tvp; 459 caddr_t sg; 460 int error; 461 462 #ifdef DEBUG 463 printf("Linux-emul(%ld): newselect(%d, %p, %p, %p, %p)\n", 464 (long)p->p_pid, args->nfds, (void *)args->readfds, 465 (void *)args->writefds, (void *)args->exceptfds, 466 (void *)args->timeout); 467 #endif 468 error = 0; 469 bsa.nd = args->nfds; 470 bsa.in = args->readfds; 471 bsa.ou = args->writefds; 472 bsa.ex = args->exceptfds; 473 bsa.tv = args->timeout; 474 475 /* 476 * Store current time for computation of the amount of 477 * time left. 478 */ 479 if (args->timeout) { 480 if ((error = copyin(args->timeout, &utv, sizeof(utv)))) 481 goto select_out; 482 #ifdef DEBUG 483 printf("Linux-emul(%ld): incoming timeout (%ld/%ld)\n", 484 (long)p->p_pid, utv.tv_sec, utv.tv_usec); 485 #endif 486 if (itimerfix(&utv)) { 487 /* 488 * The timeval was invalid. Convert it to something 489 * valid that will act as it does under Linux. 490 */ 491 sg = stackgap_init(); 492 tvp = stackgap_alloc(&sg, sizeof(utv)); 493 utv.tv_sec += utv.tv_usec / 1000000; 494 utv.tv_usec %= 1000000; 495 if (utv.tv_usec < 0) { 496 utv.tv_sec -= 1; 497 utv.tv_usec += 1000000; 498 } 499 if (utv.tv_sec < 0) 500 timevalclear(&utv); 501 if ((error = copyout(&utv, tvp, sizeof(utv)))) 502 goto select_out; 503 bsa.tv = tvp; 504 } 505 microtime(&tv0); 506 } 507 508 error = select(p, &bsa); 509 #ifdef DEBUG 510 printf("Linux-emul(%ld): real select returns %d\n", (long)p->p_pid, error); 511 #endif 512 513 if (error) { 514 /* 515 * See fs/select.c in the Linux kernel. Without this, 516 * Maelstrom doesn't work. 517 */ 518 if (error == ERESTART) 519 error = EINTR; 520 goto select_out; 521 } 522 523 if (args->timeout) { 524 if (p->p_retval[0]) { 525 /* 526 * Compute how much time was left of the timeout, 527 * by subtracting the current time and the time 528 * before we started the call, and subtracting 529 * that result from the user-supplied value. 530 */ 531 microtime(&tv1); 532 timevalsub(&tv1, &tv0); 533 timevalsub(&utv, &tv1); 534 if (utv.tv_sec < 0) 535 timevalclear(&utv); 536 } else 537 timevalclear(&utv); 538 #ifdef DEBUG 539 printf("Linux-emul(%ld): outgoing timeout (%ld/%ld)\n", 540 (long)p->p_pid, utv.tv_sec, utv.tv_usec); 541 #endif 542 if ((error = copyout(&utv, args->timeout, sizeof(utv)))) 543 goto select_out; 544 } 545 546 select_out: 547 #ifdef DEBUG 548 printf("Linux-emul(%ld): newselect_out -> %d\n", (long)p->p_pid, error); 549 #endif 550 return error; 551 } 552 553 int 554 linux_getpgid(struct proc *p, struct linux_getpgid_args *args) 555 { 556 struct proc *curp; 557 558 #ifdef DEBUG 559 printf("Linux-emul(%ld): getpgid(%d)\n", (long)p->p_pid, args->pid); 560 #endif 561 if (args->pid != p->p_pid) { 562 if (!(curp = pfind(args->pid))) 563 return ESRCH; 564 } 565 else 566 curp = p; 567 p->p_retval[0] = curp->p_pgid; 568 return 0; 569 } 570 571 int 572 linux_fork(struct proc *p, struct linux_fork_args *args) 573 { 574 int error; 575 576 #ifdef DEBUG 577 printf("Linux-emul(%ld): fork()\n", (long)p->p_pid); 578 #endif 579 if ((error = fork(p, (struct fork_args *)args)) != 0) 580 return error; 581 if (p->p_retval[1] == 1) 582 p->p_retval[0] = 0; 583 return 0; 584 } 585 586 int 587 linux_vfork(struct proc *p, struct linux_vfork_args *args) 588 { 589 int error; 590 591 #ifdef DEBUG 592 printf("Linux-emul(%ld): vfork()\n", (long)p->p_pid); 593 #endif 594 595 if ((error = vfork(p, (struct vfork_args *)args)) != 0) 596 return error; 597 /* Are we the child? */ 598 if (p->p_retval[1] == 1) 599 p->p_retval[0] = 0; 600 return 0; 601 } 602 603 #define CLONE_VM 0x100 604 #define CLONE_FS 0x200 605 #define CLONE_FILES 0x400 606 #define CLONE_SIGHAND 0x800 607 #define CLONE_PID 0x1000 608 609 int 610 linux_clone(struct proc *p, struct linux_clone_args *args) 611 { 612 int error, ff = RFPROC; 613 struct proc *p2; 614 int exit_signal; 615 vm_offset_t start; 616 struct rfork_args rf_args; 617 618 #ifdef DEBUG 619 if (args->flags & CLONE_PID) 620 printf("linux_clone(%ld): CLONE_PID not yet supported\n", 621 (long)p->p_pid); 622 printf("linux_clone(%ld): invoked with flags %x and stack %x\n", 623 (long)p->p_pid, (unsigned int)args->flags, 624 (unsigned int)args->stack); 625 #endif 626 627 if (!args->stack) 628 return (EINVAL); 629 630 exit_signal = args->flags & 0x000000ff; 631 if (exit_signal >= LINUX_NSIG) 632 return EINVAL; 633 634 if (exit_signal <= LINUX_SIGTBLSZ) 635 exit_signal = linux_to_bsd_signal[_SIG_IDX(exit_signal)]; 636 637 /* RFTHREAD probably not necessary here, but it shouldn't hurt either */ 638 ff |= RFTHREAD; 639 640 if (args->flags & CLONE_VM) 641 ff |= RFMEM; 642 if (args->flags & CLONE_SIGHAND) 643 ff |= RFSIGSHARE; 644 if (!(args->flags & CLONE_FILES)) 645 ff |= RFFDG; 646 647 error = 0; 648 start = 0; 649 650 rf_args.flags = ff; 651 if ((error = rfork(p, &rf_args)) != 0) 652 return error; 653 654 p2 = pfind(p->p_retval[0]); 655 if (p2 == 0) 656 return ESRCH; 657 658 p2->p_sigparent = exit_signal; 659 p2->p_md.md_regs->tf_esp = (unsigned int)args->stack; 660 661 #ifdef DEBUG 662 printf ("linux_clone(%ld): successful rfork to %ld\n", 663 (long)p->p_pid, (long)p2->p_pid); 664 #endif 665 return 0; 666 } 667 668 /* XXX move */ 669 struct linux_mmap_argv { 670 linux_caddr_t addr; 671 int len; 672 int prot; 673 int flags; 674 int fd; 675 int pos; 676 }; 677 678 #define STACK_SIZE (2 * 1024 * 1024) 679 #define GUARD_SIZE (4 * PAGE_SIZE) 680 int 681 linux_mmap(struct proc *p, struct linux_mmap_args *args) 682 { 683 struct mmap_args /* { 684 caddr_t addr; 685 size_t len; 686 int prot; 687 int flags; 688 int fd; 689 long pad; 690 off_t pos; 691 } */ bsd_args; 692 int error; 693 struct linux_mmap_argv linux_args; 694 695 if ((error = copyin((caddr_t)args->ptr, (caddr_t)&linux_args, 696 sizeof(linux_args)))) 697 return error; 698 #ifdef DEBUG 699 printf("Linux-emul(%ld): mmap(%p, %d, %d, %08x, %d, %d)\n", 700 (long)p->p_pid, (void *)linux_args.addr, linux_args.len, 701 linux_args.prot, linux_args.flags, linux_args.fd, linux_args.pos); 702 #endif 703 bsd_args.flags = 0; 704 if (linux_args.flags & LINUX_MAP_SHARED) 705 bsd_args.flags |= MAP_SHARED; 706 if (linux_args.flags & LINUX_MAP_PRIVATE) 707 bsd_args.flags |= MAP_PRIVATE; 708 if (linux_args.flags & LINUX_MAP_FIXED) 709 bsd_args.flags |= MAP_FIXED; 710 if (linux_args.flags & LINUX_MAP_ANON) 711 bsd_args.flags |= MAP_ANON; 712 if (linux_args.flags & LINUX_MAP_GROWSDOWN) { 713 bsd_args.flags |= MAP_STACK; 714 715 /* The linux MAP_GROWSDOWN option does not limit auto 716 * growth of the region. Linux mmap with this option 717 * takes as addr the inital BOS, and as len, the initial 718 * region size. It can then grow down from addr without 719 * limit. However, linux threads has an implicit internal 720 * limit to stack size of STACK_SIZE. Its just not 721 * enforced explicitly in linux. But, here we impose 722 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack 723 * region, since we can do this with our mmap. 724 * 725 * Our mmap with MAP_STACK takes addr as the maximum 726 * downsize limit on BOS, and as len the max size of 727 * the region. It them maps the top SGROWSIZ bytes, 728 * and autgrows the region down, up to the limit 729 * in addr. 730 * 731 * If we don't use the MAP_STACK option, the effect 732 * of this code is to allocate a stack region of a 733 * fixed size of (STACK_SIZE - GUARD_SIZE). 734 */ 735 736 /* This gives us TOS */ 737 bsd_args.addr = linux_args.addr + linux_args.len; 738 739 /* This gives us our maximum stack size */ 740 if (linux_args.len > STACK_SIZE - GUARD_SIZE) 741 bsd_args.len = linux_args.len; 742 else 743 bsd_args.len = STACK_SIZE - GUARD_SIZE; 744 745 /* This gives us a new BOS. If we're using VM_STACK, then 746 * mmap will just map the top SGROWSIZ bytes, and let 747 * the stack grow down to the limit at BOS. If we're 748 * not using VM_STACK we map the full stack, since we 749 * don't have a way to autogrow it. 750 */ 751 bsd_args.addr -= bsd_args.len; 752 753 } else { 754 bsd_args.addr = linux_args.addr; 755 bsd_args.len = linux_args.len; 756 } 757 758 bsd_args.prot = linux_args.prot | PROT_READ; /* always required */ 759 bsd_args.fd = linux_args.fd; 760 bsd_args.pos = linux_args.pos; 761 bsd_args.pad = 0; 762 return mmap(p, &bsd_args); 763 } 764 765 int 766 linux_mremap(struct proc *p, struct linux_mremap_args *args) 767 { 768 struct munmap_args /* { 769 void *addr; 770 size_t len; 771 } */ bsd_args; 772 int error = 0; 773 774 #ifdef DEBUG 775 printf("Linux-emul(%ld): mremap(%p, %08x, %08x, %08x)\n", 776 (long)p->p_pid, (void *)args->addr, args->old_len, args->new_len, 777 args->flags); 778 #endif 779 args->new_len = round_page(args->new_len); 780 args->old_len = round_page(args->old_len); 781 782 if (args->new_len > args->old_len) { 783 p->p_retval[0] = 0; 784 return ENOMEM; 785 } 786 787 if (args->new_len < args->old_len) { 788 bsd_args.addr = args->addr + args->new_len; 789 bsd_args.len = args->old_len - args->new_len; 790 error = munmap(p, &bsd_args); 791 } 792 793 p->p_retval[0] = error ? 0 : (int)args->addr; 794 return error; 795 } 796 797 int 798 linux_msync(struct proc *p, struct linux_msync_args *args) 799 { 800 struct msync_args bsd_args; 801 802 bsd_args.addr = args->addr; 803 bsd_args.len = args->len; 804 bsd_args.flags = 0; /* XXX ignore */ 805 806 return msync(p, &bsd_args); 807 } 808 809 int 810 linux_pipe(struct proc *p, struct linux_pipe_args *args) 811 { 812 int error; 813 int reg_edx; 814 815 #ifdef DEBUG 816 printf("Linux-emul(%ld): pipe(*)\n", (long)p->p_pid); 817 #endif 818 reg_edx = p->p_retval[1]; 819 error = pipe(p, 0); 820 if (error) { 821 p->p_retval[1] = reg_edx; 822 return error; 823 } 824 825 error = copyout(p->p_retval, args->pipefds, 2*sizeof(int)); 826 if (error) { 827 p->p_retval[1] = reg_edx; 828 return error; 829 } 830 831 p->p_retval[1] = reg_edx; 832 p->p_retval[0] = 0; 833 return 0; 834 } 835 836 int 837 linux_time(struct proc *p, struct linux_time_args *args) 838 { 839 struct timeval tv; 840 linux_time_t tm; 841 int error; 842 843 #ifdef DEBUG 844 printf("Linux-emul(%ld): time(*)\n", (long)p->p_pid); 845 #endif 846 microtime(&tv); 847 tm = tv.tv_sec; 848 if (args->tm && (error = copyout(&tm, args->tm, sizeof(linux_time_t)))) 849 return error; 850 p->p_retval[0] = tm; 851 return 0; 852 } 853 854 struct linux_times_argv { 855 long tms_utime; 856 long tms_stime; 857 long tms_cutime; 858 long tms_cstime; 859 }; 860 861 #define CLK_TCK 100 /* Linux uses 100 */ 862 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK)) 863 864 int 865 linux_times(struct proc *p, struct linux_times_args *args) 866 { 867 struct timeval tv; 868 struct linux_times_argv tms; 869 struct rusage ru; 870 int error; 871 872 #ifdef DEBUG 873 printf("Linux-emul(%ld): times(*)\n", (long)p->p_pid); 874 #endif 875 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL); 876 877 tms.tms_utime = CONVTCK(ru.ru_utime); 878 tms.tms_stime = CONVTCK(ru.ru_stime); 879 880 tms.tms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 881 tms.tms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 882 883 if ((error = copyout((caddr_t)&tms, (caddr_t)args->buf, 884 sizeof(struct linux_times_argv)))) 885 return error; 886 887 microuptime(&tv); 888 p->p_retval[0] = (int)CONVTCK(tv); 889 return 0; 890 } 891 892 int 893 linux_newuname(struct proc *p, struct linux_newuname_args *args) 894 { 895 struct linux_new_utsname utsname; 896 char *osrelease, *osname; 897 898 #ifdef DEBUG 899 printf("Linux-emul(%ld): newuname(*)\n", (long)p->p_pid); 900 #endif 901 902 osname = linux_get_osname(p); 903 osrelease = linux_get_osrelease(p); 904 905 bzero(&utsname, sizeof(struct linux_new_utsname)); 906 strncpy(utsname.sysname, osname, LINUX_MAX_UTSNAME-1); 907 strncpy(utsname.nodename, hostname, LINUX_MAX_UTSNAME-1); 908 strncpy(utsname.release, osrelease, LINUX_MAX_UTSNAME-1); 909 strncpy(utsname.version, version, LINUX_MAX_UTSNAME-1); 910 strncpy(utsname.machine, machine, LINUX_MAX_UTSNAME-1); 911 strncpy(utsname.domainname, domainname, LINUX_MAX_UTSNAME-1); 912 913 return (copyout((caddr_t)&utsname, (caddr_t)args->buf, 914 sizeof(struct linux_new_utsname))); 915 } 916 917 struct linux_utimbuf { 918 linux_time_t l_actime; 919 linux_time_t l_modtime; 920 }; 921 922 int 923 linux_utime(struct proc *p, struct linux_utime_args *args) 924 { 925 struct utimes_args /* { 926 char *path; 927 struct timeval *tptr; 928 } */ bsdutimes; 929 struct timeval tv[2], *tvp; 930 struct linux_utimbuf lut; 931 int error; 932 caddr_t sg; 933 934 sg = stackgap_init(); 935 CHECKALTEXIST(p, &sg, args->fname); 936 937 #ifdef DEBUG 938 printf("Linux-emul(%ld): utime(%s, *)\n", (long)p->p_pid, args->fname); 939 #endif 940 if (args->times) { 941 if ((error = copyin(args->times, &lut, sizeof lut))) 942 return error; 943 tv[0].tv_sec = lut.l_actime; 944 tv[0].tv_usec = 0; 945 tv[1].tv_sec = lut.l_modtime; 946 tv[1].tv_usec = 0; 947 /* so that utimes can copyin */ 948 tvp = (struct timeval *)stackgap_alloc(&sg, sizeof(tv)); 949 if ((error = copyout(tv, tvp, sizeof(tv)))) 950 return error; 951 bsdutimes.tptr = tvp; 952 } else 953 bsdutimes.tptr = NULL; 954 955 bsdutimes.path = args->fname; 956 return utimes(p, &bsdutimes); 957 } 958 959 #define __WCLONE 0x80000000 960 961 int 962 linux_waitpid(struct proc *p, struct linux_waitpid_args *args) 963 { 964 struct wait_args /* { 965 int pid; 966 int *status; 967 int options; 968 struct rusage *rusage; 969 } */ tmp; 970 int error, tmpstat; 971 972 #ifdef DEBUG 973 printf("Linux-emul(%ld): waitpid(%d, %p, %d)\n", 974 (long)p->p_pid, args->pid, (void *)args->status, args->options); 975 #endif 976 tmp.pid = args->pid; 977 tmp.status = args->status; 978 tmp.options = (args->options & (WNOHANG | WUNTRACED)); 979 /* WLINUXCLONE should be equal to __WCLONE, but we make sure */ 980 if (args->options & __WCLONE) 981 tmp.options |= WLINUXCLONE; 982 tmp.rusage = NULL; 983 984 if ((error = wait4(p, &tmp)) != 0) 985 return error; 986 987 if (args->status) { 988 if ((error = copyin(args->status, &tmpstat, sizeof(int))) != 0) 989 return error; 990 tmpstat &= 0xffff; 991 if (WIFSIGNALED(tmpstat)) 992 tmpstat = (tmpstat & 0xffffff80) | 993 BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat)); 994 else if (WIFSTOPPED(tmpstat)) 995 tmpstat = (tmpstat & 0xffff00ff) | 996 (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8); 997 return copyout(&tmpstat, args->status, sizeof(int)); 998 } else 999 return 0; 1000 } 1001 1002 int 1003 linux_wait4(struct proc *p, struct linux_wait4_args *args) 1004 { 1005 struct wait_args /* { 1006 int pid; 1007 int *status; 1008 int options; 1009 struct rusage *rusage; 1010 } */ tmp; 1011 int error, tmpstat; 1012 1013 #ifdef DEBUG 1014 printf("Linux-emul(%ld): wait4(%d, %p, %d, %p)\n", 1015 (long)p->p_pid, args->pid, (void *)args->status, args->options, 1016 (void *)args->rusage); 1017 #endif 1018 tmp.pid = args->pid; 1019 tmp.status = args->status; 1020 tmp.options = (args->options & (WNOHANG | WUNTRACED)); 1021 /* WLINUXCLONE should be equal to __WCLONE, but we make sure */ 1022 if (args->options & __WCLONE) 1023 tmp.options |= WLINUXCLONE; 1024 tmp.rusage = args->rusage; 1025 1026 if ((error = wait4(p, &tmp)) != 0) 1027 return error; 1028 1029 SIGDELSET(p->p_siglist, SIGCHLD); 1030 1031 if (args->status) { 1032 if ((error = copyin(args->status, &tmpstat, sizeof(int))) != 0) 1033 return error; 1034 tmpstat &= 0xffff; 1035 if (WIFSIGNALED(tmpstat)) 1036 tmpstat = (tmpstat & 0xffffff80) | 1037 BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat)); 1038 else if (WIFSTOPPED(tmpstat)) 1039 tmpstat = (tmpstat & 0xffff00ff) | 1040 (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8); 1041 return copyout(&tmpstat, args->status, sizeof(int)); 1042 } else 1043 return 0; 1044 } 1045 1046 int 1047 linux_mknod(struct proc *p, struct linux_mknod_args *args) 1048 { 1049 caddr_t sg; 1050 struct mknod_args bsd_mknod; 1051 struct mkfifo_args bsd_mkfifo; 1052 1053 sg = stackgap_init(); 1054 1055 CHECKALTCREAT(p, &sg, args->path); 1056 1057 #ifdef DEBUG 1058 printf("Linux-emul(%ld): mknod(%s, %d, %d)\n", 1059 (long)p->p_pid, args->path, args->mode, args->dev); 1060 #endif 1061 1062 if (args->mode & S_IFIFO) { 1063 bsd_mkfifo.path = args->path; 1064 bsd_mkfifo.mode = args->mode; 1065 return mkfifo(p, &bsd_mkfifo); 1066 } else { 1067 bsd_mknod.path = args->path; 1068 bsd_mknod.mode = args->mode; 1069 bsd_mknod.dev = args->dev; 1070 return mknod(p, &bsd_mknod); 1071 } 1072 } 1073 1074 /* 1075 * UGH! This is just about the dumbest idea I've ever heard!! 1076 */ 1077 int 1078 linux_personality(struct proc *p, struct linux_personality_args *args) 1079 { 1080 #ifdef DEBUG 1081 printf("Linux-emul(%ld): personality(%d)\n", 1082 (long)p->p_pid, args->per); 1083 #endif 1084 if (args->per != 0) 1085 return EINVAL; 1086 1087 /* Yes Jim, it's still a Linux... */ 1088 p->p_retval[0] = 0; 1089 return 0; 1090 } 1091 1092 /* 1093 * Wrappers for get/setitimer for debugging.. 1094 */ 1095 int 1096 linux_setitimer(struct proc *p, struct linux_setitimer_args *args) 1097 { 1098 struct setitimer_args bsa; 1099 struct itimerval foo; 1100 int error; 1101 1102 #ifdef DEBUG 1103 printf("Linux-emul(%ld): setitimer(%p, %p)\n", 1104 (long)p->p_pid, (void *)args->itv, (void *)args->oitv); 1105 #endif 1106 bsa.which = args->which; 1107 bsa.itv = args->itv; 1108 bsa.oitv = args->oitv; 1109 if (args->itv) { 1110 if ((error = copyin((caddr_t)args->itv, (caddr_t)&foo, 1111 sizeof(foo)))) 1112 return error; 1113 #ifdef DEBUG 1114 printf("setitimer: value: sec: %ld, usec: %ld\n", 1115 foo.it_value.tv_sec, foo.it_value.tv_usec); 1116 printf("setitimer: interval: sec: %ld, usec: %ld\n", 1117 foo.it_interval.tv_sec, foo.it_interval.tv_usec); 1118 #endif 1119 } 1120 return setitimer(p, &bsa); 1121 } 1122 1123 int 1124 linux_getitimer(struct proc *p, struct linux_getitimer_args *args) 1125 { 1126 struct getitimer_args bsa; 1127 #ifdef DEBUG 1128 printf("Linux-emul(%ld): getitimer(%p)\n", 1129 (long)p->p_pid, (void *)args->itv); 1130 #endif 1131 bsa.which = args->which; 1132 bsa.itv = args->itv; 1133 return getitimer(p, &bsa); 1134 } 1135 1136 int 1137 linux_ioperm(struct proc *p, struct linux_ioperm_args *args) 1138 { 1139 struct sysarch_args sa; 1140 struct i386_ioperm_args *iia; 1141 caddr_t sg; 1142 1143 sg = stackgap_init(); 1144 iia = stackgap_alloc(&sg, sizeof(struct i386_ioperm_args)); 1145 iia->start = args->start; 1146 iia->length = args->length; 1147 iia->enable = args->enable; 1148 sa.op = I386_SET_IOPERM; 1149 sa.parms = (char *)iia; 1150 return sysarch(p, &sa); 1151 } 1152 1153 int 1154 linux_iopl(struct proc *p, struct linux_iopl_args *args) 1155 { 1156 int error; 1157 1158 if (args->level < 0 || args->level > 3) 1159 return (EINVAL); 1160 if ((error = suser(p)) != 0) 1161 return (error); 1162 if (securelevel > 0) 1163 return (EPERM); 1164 p->p_md.md_regs->tf_eflags = (p->p_md.md_regs->tf_eflags & ~PSL_IOPL) | 1165 (args->level * (PSL_IOPL / 3)); 1166 return (0); 1167 } 1168 1169 int 1170 linux_nice(struct proc *p, struct linux_nice_args *args) 1171 { 1172 struct setpriority_args bsd_args; 1173 1174 bsd_args.which = PRIO_PROCESS; 1175 bsd_args.who = 0; /* current process */ 1176 bsd_args.prio = args->inc; 1177 return setpriority(p, &bsd_args); 1178 } 1179 1180 int 1181 linux_setgroups(p, uap) 1182 struct proc *p; 1183 struct linux_setgroups_args *uap; 1184 { 1185 struct pcred *pc; 1186 linux_gid_t linux_gidset[NGROUPS]; 1187 gid_t *bsd_gidset; 1188 int ngrp, error; 1189 1190 pc = p->p_cred; 1191 ngrp = uap->gidsetsize; 1192 1193 /* 1194 * cr_groups[0] holds egid. Setting the whole set from 1195 * the supplied set will cause egid to be changed too. 1196 * Keep cr_groups[0] unchanged to prevent that. 1197 */ 1198 1199 if ((error = suser(p)) != 0) 1200 return (error); 1201 1202 if (ngrp >= NGROUPS) 1203 return (EINVAL); 1204 1205 pc->pc_ucred = crcopy(pc->pc_ucred); 1206 if (ngrp > 0) { 1207 error = copyin((caddr_t)uap->gidset, (caddr_t)linux_gidset, 1208 ngrp * sizeof(linux_gid_t)); 1209 if (error) 1210 return (error); 1211 1212 pc->pc_ucred->cr_ngroups = ngrp + 1; 1213 1214 bsd_gidset = pc->pc_ucred->cr_groups; 1215 ngrp--; 1216 while (ngrp >= 0) { 1217 bsd_gidset[ngrp + 1] = linux_gidset[ngrp]; 1218 ngrp--; 1219 } 1220 } 1221 else 1222 pc->pc_ucred->cr_ngroups = 1; 1223 1224 setsugid(p); 1225 return (0); 1226 } 1227 1228 int 1229 linux_getgroups(p, uap) 1230 struct proc *p; 1231 struct linux_getgroups_args *uap; 1232 { 1233 struct pcred *pc; 1234 linux_gid_t linux_gidset[NGROUPS]; 1235 gid_t *bsd_gidset; 1236 int bsd_gidsetsz, ngrp, error; 1237 1238 pc = p->p_cred; 1239 bsd_gidset = pc->pc_ucred->cr_groups; 1240 bsd_gidsetsz = pc->pc_ucred->cr_ngroups - 1; 1241 1242 /* 1243 * cr_groups[0] holds egid. Returning the whole set 1244 * here will cause a duplicate. Exclude cr_groups[0] 1245 * to prevent that. 1246 */ 1247 1248 if ((ngrp = uap->gidsetsize) == 0) { 1249 p->p_retval[0] = bsd_gidsetsz; 1250 return (0); 1251 } 1252 1253 if (ngrp < bsd_gidsetsz) 1254 return (EINVAL); 1255 1256 ngrp = 0; 1257 while (ngrp < bsd_gidsetsz) { 1258 linux_gidset[ngrp] = bsd_gidset[ngrp + 1]; 1259 ngrp++; 1260 } 1261 1262 if ((error = copyout((caddr_t)linux_gidset, (caddr_t)uap->gidset, 1263 ngrp * sizeof(linux_gid_t)))) 1264 return (error); 1265 1266 p->p_retval[0] = ngrp; 1267 return (0); 1268 } 1269 1270 int 1271 linux_setrlimit(p, uap) 1272 struct proc *p; 1273 struct linux_setrlimit_args *uap; 1274 { 1275 struct osetrlimit_args bsd; 1276 1277 #ifdef DEBUG 1278 printf("Linux-emul(%ld): setrlimit(%d, %p)\n", 1279 (long)p->p_pid, uap->resource, (void *)uap->rlim); 1280 #endif 1281 1282 if (uap->resource >= LINUX_RLIM_NLIMITS) 1283 return EINVAL; 1284 1285 bsd.which = linux_to_bsd_resource[uap->resource]; 1286 1287 if (bsd.which == -1) 1288 return EINVAL; 1289 1290 bsd.rlp = uap->rlim; 1291 return osetrlimit(p, &bsd); 1292 } 1293 1294 int 1295 linux_getrlimit(p, uap) 1296 struct proc *p; 1297 struct linux_getrlimit_args *uap; 1298 { 1299 struct ogetrlimit_args bsd; 1300 1301 #ifdef DEBUG 1302 printf("Linux-emul(%ld): getrlimit(%d, %p)\n", 1303 (long)p->p_pid, uap->resource, (void *)uap->rlim); 1304 #endif 1305 1306 if (uap->resource >= LINUX_RLIM_NLIMITS) 1307 return EINVAL; 1308 1309 bsd.which = linux_to_bsd_resource[uap->resource]; 1310 1311 if (bsd.which == -1) 1312 return EINVAL; 1313 1314 bsd.rlp = uap->rlim; 1315 return ogetrlimit(p, &bsd); 1316 } 1317 1318 int 1319 linux_sched_setscheduler(p, uap) 1320 struct proc *p; 1321 struct linux_sched_setscheduler_args *uap; 1322 { 1323 struct sched_setscheduler_args bsd; 1324 1325 #ifdef DEBUG 1326 printf("Linux-emul(%ld): sched_setscheduler(%d, %d, %p)\n", 1327 (long)p->p_pid, uap->pid, uap->policy, (const void *)uap->param); 1328 #endif 1329 1330 switch (uap->policy) { 1331 case LINUX_SCHED_OTHER: 1332 bsd.policy = SCHED_OTHER; 1333 break; 1334 case LINUX_SCHED_FIFO: 1335 bsd.policy = SCHED_FIFO; 1336 break; 1337 case LINUX_SCHED_RR: 1338 bsd.policy = SCHED_RR; 1339 break; 1340 default: 1341 return EINVAL; 1342 } 1343 1344 bsd.pid = uap->pid; 1345 bsd.param = uap->param; 1346 return sched_setscheduler(p, &bsd); 1347 } 1348 1349 int 1350 linux_sched_getscheduler(p, uap) 1351 struct proc *p; 1352 struct linux_sched_getscheduler_args *uap; 1353 { 1354 struct sched_getscheduler_args bsd; 1355 int error; 1356 1357 #ifdef DEBUG 1358 printf("Linux-emul(%ld): sched_getscheduler(%d)\n", 1359 (long)p->p_pid, uap->pid); 1360 #endif 1361 1362 bsd.pid = uap->pid; 1363 error = sched_getscheduler(p, &bsd); 1364 1365 switch (p->p_retval[0]) { 1366 case SCHED_OTHER: 1367 p->p_retval[0] = LINUX_SCHED_OTHER; 1368 break; 1369 case SCHED_FIFO: 1370 p->p_retval[0] = LINUX_SCHED_FIFO; 1371 break; 1372 case SCHED_RR: 1373 p->p_retval[0] = LINUX_SCHED_RR; 1374 break; 1375 } 1376 1377 return error; 1378 } 1379 1380 struct linux_descriptor { 1381 unsigned int entry_number; 1382 unsigned long base_addr; 1383 unsigned int limit; 1384 unsigned int seg_32bit:1; 1385 unsigned int contents:2; 1386 unsigned int read_exec_only:1; 1387 unsigned int limit_in_pages:1; 1388 unsigned int seg_not_present:1; 1389 unsigned int useable:1; 1390 }; 1391 1392 int 1393 linux_modify_ldt(p, uap) 1394 struct proc *p; 1395 struct linux_modify_ldt_args *uap; 1396 { 1397 int error; 1398 caddr_t sg; 1399 struct sysarch_args args; 1400 struct i386_ldt_args *ldt; 1401 struct linux_descriptor ld; 1402 union descriptor *desc; 1403 1404 sg = stackgap_init(); 1405 1406 if (uap->ptr == NULL) 1407 return (EINVAL); 1408 1409 switch (uap->func) { 1410 case 0x00: /* read_ldt */ 1411 ldt = stackgap_alloc(&sg, sizeof(*ldt)); 1412 ldt->start = 0; 1413 ldt->descs = uap->ptr; 1414 ldt->num = uap->bytecount / sizeof(union descriptor); 1415 args.op = I386_GET_LDT; 1416 args.parms = (char*)ldt; 1417 error = sysarch(p, &args); 1418 p->p_retval[0] *= sizeof(union descriptor); 1419 break; 1420 case 0x01: /* write_ldt */ 1421 case 0x11: /* write_ldt */ 1422 if (uap->bytecount != sizeof(ld)) 1423 return (EINVAL); 1424 1425 error = copyin(uap->ptr, &ld, sizeof(ld)); 1426 if (error) 1427 return (error); 1428 1429 ldt = stackgap_alloc(&sg, sizeof(*ldt)); 1430 desc = stackgap_alloc(&sg, sizeof(*desc)); 1431 ldt->start = ld.entry_number; 1432 ldt->descs = desc; 1433 ldt->num = 1; 1434 desc->sd.sd_lolimit = (ld.limit & 0x0000ffff); 1435 desc->sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; 1436 desc->sd.sd_lobase = (ld.base_addr & 0x00ffffff); 1437 desc->sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; 1438 desc->sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | 1439 (ld.contents << 2); 1440 desc->sd.sd_dpl = 3; 1441 desc->sd.sd_p = (ld.seg_not_present ^ 1); 1442 desc->sd.sd_xx = 0; 1443 desc->sd.sd_def32 = ld.seg_32bit; 1444 desc->sd.sd_gran = ld.limit_in_pages; 1445 args.op = I386_SET_LDT; 1446 args.parms = (char*)ldt; 1447 error = sysarch(p, &args); 1448 break; 1449 default: 1450 error = EINVAL; 1451 break; 1452 } 1453 1454 if (error == EOPNOTSUPP) { 1455 printf("linux: modify_ldt needs kernel option USER_LDT\n"); 1456 error = ENOSYS; 1457 } 1458 1459 return (error); 1460 } 1461