linux_machdep.c revision 163536
1/*- 2 * Copyright (c) 2000 Marcel Moolenaar 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 without 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 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/i386/linux/linux_machdep.c 163536 2006-10-20 10:09:40Z netchild $"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/file.h> 35#include <sys/fcntl.h> 36#include <sys/imgact.h> 37#include <sys/lock.h> 38#include <sys/malloc.h> 39#include <sys/mman.h> 40#include <sys/mutex.h> 41#include <sys/sx.h> 42#include <sys/proc.h> 43#include <sys/queue.h> 44#include <sys/resource.h> 45#include <sys/resourcevar.h> 46#include <sys/signalvar.h> 47#include <sys/syscallsubr.h> 48#include <sys/sysproto.h> 49#include <sys/unistd.h> 50#include <sys/wait.h> 51 52#include <machine/frame.h> 53#include <machine/psl.h> 54#include <machine/segments.h> 55#include <machine/sysarch.h> 56 57#include <vm/vm.h> 58#include <vm/pmap.h> 59#include <vm/vm_map.h> 60 61#include <i386/linux/linux.h> 62#include <i386/linux/linux_proto.h> 63#include <compat/linux/linux_ipc.h> 64#include <compat/linux/linux_signal.h> 65#include <compat/linux/linux_util.h> 66#include <compat/linux/linux_emul.h> 67 68#include <i386/include/pcb.h> /* needed for pcb definition in linux_set_thread_area */ 69 70#include "opt_posix.h" 71 72extern struct sysentvec elf32_freebsd_sysvec; /* defined in i386/i386/elf_machdep.c */ 73 74struct l_descriptor { 75 l_uint entry_number; 76 l_ulong base_addr; 77 l_uint limit; 78 l_uint seg_32bit:1; 79 l_uint contents:2; 80 l_uint read_exec_only:1; 81 l_uint limit_in_pages:1; 82 l_uint seg_not_present:1; 83 l_uint useable:1; 84}; 85 86struct l_old_select_argv { 87 l_int nfds; 88 l_fd_set *readfds; 89 l_fd_set *writefds; 90 l_fd_set *exceptfds; 91 struct l_timeval *timeout; 92}; 93 94int 95linux_to_bsd_sigaltstack(int lsa) 96{ 97 int bsa = 0; 98 99 if (lsa & LINUX_SS_DISABLE) 100 bsa |= SS_DISABLE; 101 if (lsa & LINUX_SS_ONSTACK) 102 bsa |= SS_ONSTACK; 103 return (bsa); 104} 105 106int 107bsd_to_linux_sigaltstack(int bsa) 108{ 109 int lsa = 0; 110 111 if (bsa & SS_DISABLE) 112 lsa |= LINUX_SS_DISABLE; 113 if (bsa & SS_ONSTACK) 114 lsa |= LINUX_SS_ONSTACK; 115 return (lsa); 116} 117 118int 119linux_execve(struct thread *td, struct linux_execve_args *args) 120{ 121 int error; 122 char *newpath; 123 struct image_args eargs; 124 125 LCONVPATHEXIST(td, args->path, &newpath); 126 127#ifdef DEBUG 128 if (ldebug(execve)) 129 printf(ARGS(execve, "%s"), newpath); 130#endif 131 132 error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE, 133 args->argp, args->envp); 134 free(newpath, M_TEMP); 135 if (error == 0) 136 error = kern_execve(td, &eargs, NULL); 137 if (error == 0) 138 /* linux process can exec fbsd one, dont attempt 139 * to create emuldata for such process using 140 * linux_proc_init, this leads to a panic on KASSERT 141 * because such process has p->p_emuldata == NULL 142 */ 143 if (td->td_proc->p_sysent == &elf_linux_sysvec) 144 error = linux_proc_init(td, 0, 0); 145 return (error); 146} 147 148struct l_ipc_kludge { 149 struct l_msgbuf *msgp; 150 l_long msgtyp; 151}; 152 153int 154linux_ipc(struct thread *td, struct linux_ipc_args *args) 155{ 156 157 switch (args->what & 0xFFFF) { 158 case LINUX_SEMOP: { 159 struct linux_semop_args a; 160 161 a.semid = args->arg1; 162 a.tsops = args->ptr; 163 a.nsops = args->arg2; 164 return (linux_semop(td, &a)); 165 } 166 case LINUX_SEMGET: { 167 struct linux_semget_args a; 168 169 a.key = args->arg1; 170 a.nsems = args->arg2; 171 a.semflg = args->arg3; 172 return (linux_semget(td, &a)); 173 } 174 case LINUX_SEMCTL: { 175 struct linux_semctl_args a; 176 int error; 177 178 a.semid = args->arg1; 179 a.semnum = args->arg2; 180 a.cmd = args->arg3; 181 error = copyin(args->ptr, &a.arg, sizeof(a.arg)); 182 if (error) 183 return (error); 184 return (linux_semctl(td, &a)); 185 } 186 case LINUX_MSGSND: { 187 struct linux_msgsnd_args a; 188 189 a.msqid = args->arg1; 190 a.msgp = args->ptr; 191 a.msgsz = args->arg2; 192 a.msgflg = args->arg3; 193 return (linux_msgsnd(td, &a)); 194 } 195 case LINUX_MSGRCV: { 196 struct linux_msgrcv_args a; 197 198 a.msqid = args->arg1; 199 a.msgsz = args->arg2; 200 a.msgflg = args->arg3; 201 if ((args->what >> 16) == 0) { 202 struct l_ipc_kludge tmp; 203 int error; 204 205 if (args->ptr == NULL) 206 return (EINVAL); 207 error = copyin(args->ptr, &tmp, sizeof(tmp)); 208 if (error) 209 return (error); 210 a.msgp = tmp.msgp; 211 a.msgtyp = tmp.msgtyp; 212 } else { 213 a.msgp = args->ptr; 214 a.msgtyp = args->arg5; 215 } 216 return (linux_msgrcv(td, &a)); 217 } 218 case LINUX_MSGGET: { 219 struct linux_msgget_args a; 220 221 a.key = args->arg1; 222 a.msgflg = args->arg2; 223 return (linux_msgget(td, &a)); 224 } 225 case LINUX_MSGCTL: { 226 struct linux_msgctl_args a; 227 228 a.msqid = args->arg1; 229 a.cmd = args->arg2; 230 a.buf = args->ptr; 231 return (linux_msgctl(td, &a)); 232 } 233 case LINUX_SHMAT: { 234 struct linux_shmat_args a; 235 236 a.shmid = args->arg1; 237 a.shmaddr = args->ptr; 238 a.shmflg = args->arg2; 239 a.raddr = (l_ulong *)args->arg3; 240 return (linux_shmat(td, &a)); 241 } 242 case LINUX_SHMDT: { 243 struct linux_shmdt_args a; 244 245 a.shmaddr = args->ptr; 246 return (linux_shmdt(td, &a)); 247 } 248 case LINUX_SHMGET: { 249 struct linux_shmget_args a; 250 251 a.key = args->arg1; 252 a.size = args->arg2; 253 a.shmflg = args->arg3; 254 return (linux_shmget(td, &a)); 255 } 256 case LINUX_SHMCTL: { 257 struct linux_shmctl_args a; 258 259 a.shmid = args->arg1; 260 a.cmd = args->arg2; 261 a.buf = args->ptr; 262 return (linux_shmctl(td, &a)); 263 } 264 default: 265 break; 266 } 267 268 return (EINVAL); 269} 270 271int 272linux_old_select(struct thread *td, struct linux_old_select_args *args) 273{ 274 struct l_old_select_argv linux_args; 275 struct linux_select_args newsel; 276 int error; 277 278#ifdef DEBUG 279 if (ldebug(old_select)) 280 printf(ARGS(old_select, "%p"), args->ptr); 281#endif 282 283 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 284 if (error) 285 return (error); 286 287 newsel.nfds = linux_args.nfds; 288 newsel.readfds = linux_args.readfds; 289 newsel.writefds = linux_args.writefds; 290 newsel.exceptfds = linux_args.exceptfds; 291 newsel.timeout = linux_args.timeout; 292 return (linux_select(td, &newsel)); 293} 294 295int 296linux_fork(struct thread *td, struct linux_fork_args *args) 297{ 298 int error; 299 300#ifdef DEBUG 301 if (ldebug(fork)) 302 printf(ARGS(fork, "")); 303#endif 304 305 if ((error = fork(td, (struct fork_args *)args)) != 0) 306 return (error); 307 308 if (td->td_retval[1] == 1) 309 td->td_retval[0] = 0; 310 error = linux_proc_init(td, td->td_retval[0], 0); 311 if (error) 312 return (error); 313 314 return (0); 315} 316 317int 318linux_vfork(struct thread *td, struct linux_vfork_args *args) 319{ 320 int error; 321 struct proc *p2; 322 323#ifdef DEBUG 324 if (ldebug(vfork)) 325 printf(ARGS(vfork, "")); 326#endif 327 328 /* exclude RFPPWAIT */ 329 if ((error = fork1(td, RFFDG | RFPROC | RFMEM, 0, &p2)) != 0) 330 return (error); 331 if (error == 0) { 332 td->td_retval[0] = p2->p_pid; 333 td->td_retval[1] = 0; 334 } 335 /* Are we the child? */ 336 if (td->td_retval[1] == 1) 337 td->td_retval[0] = 0; 338 error = linux_proc_init(td, td->td_retval[0], 0); 339 if (error) 340 return (error); 341 /* wait for the children to exit, ie. emulate vfork */ 342 PROC_LOCK(p2); 343 while (p2->p_flag & P_PPWAIT) 344 msleep(td->td_proc, &p2->p_mtx, PWAIT, "ppwait", 0); 345 PROC_UNLOCK(p2); 346 347 return (0); 348} 349 350int 351linux_clone(struct thread *td, struct linux_clone_args *args) 352{ 353 int error, ff = RFPROC | RFSTOPPED; 354 struct proc *p2; 355 struct thread *td2; 356 int exit_signal; 357 struct linux_emuldata *em; 358 359#ifdef DEBUG 360 if (ldebug(clone)) { 361 printf(ARGS(clone, "flags %x, stack %x, parent tid: %x, child tid: %x"), 362 (unsigned int)args->flags, (unsigned int)args->stack, 363 (unsigned int)args->parent_tidptr, (unsigned int)args->child_tidptr); 364 } 365#endif 366 367 exit_signal = args->flags & 0x000000ff; 368 if (!LINUX_SIG_VALID(exit_signal) && exit_signal != 0) 369 return (EINVAL); 370 371 if (exit_signal <= LINUX_SIGTBLSZ) 372 exit_signal = linux_to_bsd_signal[_SIG_IDX(exit_signal)]; 373 374 if (args->flags & CLONE_VM) 375 ff |= RFMEM; 376 if (args->flags & CLONE_SIGHAND) 377 ff |= RFSIGSHARE; 378 /* 379 * XXX: in linux sharing of fs info (chroot/cwd/umask) 380 * and open files is independant. in fbsd its in one 381 * structure but in reality it doesnt make any problems 382 * because both this flags are set at once usually. 383 */ 384 if (!(args->flags & (CLONE_FILES | CLONE_FS))) 385 ff |= RFFDG; 386 387 /* 388 * Attempt to detect when linux_clone(2) is used for creating 389 * kernel threads. Unfortunately despite the existence of the 390 * CLONE_THREAD flag, version of linuxthreads package used in 391 * most popular distros as of beginning of 2005 doesn't make 392 * any use of it. Therefore, this detection relay fully on 393 * empirical observation that linuxthreads sets certain 394 * combination of flags, so that we can make more or less 395 * precise detection and notify the FreeBSD kernel that several 396 * processes are in fact part of the same threading group, so 397 * that special treatment is necessary for signal delivery 398 * between those processes and fd locking. 399 */ 400 if ((args->flags & 0xffffff00) == THREADING_FLAGS) 401 ff |= RFTHREAD; 402 403 error = fork1(td, ff, 0, &p2); 404 if (error) 405 return (error); 406 407 /* create the emuldata */ 408 error = linux_proc_init(td, p2->p_pid, args->flags); 409 /* reference it - no need to check this */ 410 em = em_find(p2, EMUL_UNLOCKED); 411 KASSERT(em != NULL, ("clone: emuldata not found.\n")); 412 /* and adjust it */ 413 if (args->flags & CLONE_PARENT_SETTID) { 414 if (args->parent_tidptr == NULL) { 415 EMUL_UNLOCK(&emul_lock); 416 return (EINVAL); 417 } 418 error = copyout(&p2->p_pid, args->parent_tidptr, sizeof(p2->p_pid)); 419 if (error) { 420 EMUL_UNLOCK(&emul_lock); 421 return (error); 422 } 423 } 424 425 if (args->flags & (CLONE_PARENT|CLONE_THREAD)) { 426 sx_xlock(&proctree_lock); 427 PROC_LOCK(p2); 428 proc_reparent(p2, td->td_proc->p_pptr); 429 PROC_UNLOCK(p2); 430 sx_xunlock(&proctree_lock); 431 } 432 433 if (args->flags & CLONE_THREAD) { 434 /* XXX: linux mangles pgrp and pptr somehow 435 * I think it might be this but I am not sure. 436 */ 437#ifdef notyet 438 PROC_LOCK(p2); 439 p2->p_pgrp = td->td_proc->p_pgrp; 440 PROC_UNLOCK(p2); 441#endif 442 exit_signal = 0; 443 } 444 445 if (args->flags & CLONE_CHILD_SETTID) 446 em->child_set_tid = args->child_tidptr; 447 else 448 em->child_set_tid = NULL; 449 450 if (args->flags & CLONE_CHILD_CLEARTID) 451 em->child_clear_tid = args->child_tidptr; 452 else 453 em->child_clear_tid = NULL; 454 455 EMUL_UNLOCK(&emul_lock); 456 457 PROC_LOCK(p2); 458 p2->p_sigparent = exit_signal; 459 PROC_UNLOCK(p2); 460 td2 = FIRST_THREAD_IN_PROC(p2); 461 /* 462 * in a case of stack = NULL we are supposed to COW calling process stack 463 * this is what normal fork() does so we just keep the tf_esp arg intact 464 */ 465 if (args->stack) 466 td2->td_frame->tf_esp = (unsigned int)args->stack; 467 468 if (args->flags & CLONE_SETTLS) { 469 struct l_user_desc info; 470 int idx; 471 int a[2]; 472 struct segment_descriptor sd; 473 474 error = copyin((void *)td->td_frame->tf_esi, &info, sizeof(struct l_user_desc)); 475 if (error) 476 return (error); 477 478 idx = info.entry_number; 479 480 /* 481 * looks like we're getting the idx we returned 482 * in the set_thread_area() syscall 483 */ 484 if (idx != 6 && idx != 3) 485 return (EINVAL); 486 487 /* this doesnt happen in practice */ 488 if (idx == 6) { 489 /* we might copy out the entry_number as 3 */ 490 info.entry_number = 3; 491 error = copyout(&info, (void *) td->td_frame->tf_esi, sizeof(struct l_user_desc)); 492 if (error) 493 return (error); 494 } 495 496 a[0] = LDT_entry_a(&info); 497 a[1] = LDT_entry_b(&info); 498 499 memcpy(&sd, &a, sizeof(a)); 500#ifdef DEBUG 501 if (ldebug(clone)) 502 printf("Segment created in clone with CLONE_SETTLS: lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, type: %i, dpl: %i, p: %i, xx: %i, def32: %i, gran: %i\n", sd.sd_lobase, 503 sd.sd_hibase, 504 sd.sd_lolimit, 505 sd.sd_hilimit, 506 sd.sd_type, 507 sd.sd_dpl, 508 sd.sd_p, 509 sd.sd_xx, 510 sd.sd_def32, 511 sd.sd_gran); 512#endif 513 514 /* set %gs */ 515 td2->td_pcb->pcb_gsd = sd; 516 td2->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL); 517 } 518 519#ifdef DEBUG 520 if (ldebug(clone)) 521 printf(LMSG("clone: successful rfork to %ld, stack %p sig = %d"), 522 (long)p2->p_pid, args->stack, exit_signal); 523#endif 524 525 /* 526 * Make this runnable after we are finished with it. 527 */ 528 mtx_lock_spin(&sched_lock); 529 TD_SET_CAN_RUN(td2); 530 setrunqueue(td2, SRQ_BORING); 531 mtx_unlock_spin(&sched_lock); 532 533 td->td_retval[0] = p2->p_pid; 534 td->td_retval[1] = 0; 535 536 if (args->flags & CLONE_VFORK) { 537 /* wait for the children to exit, ie. emulate vfork */ 538 PROC_LOCK(p2); 539 p2->p_flag |= P_PPWAIT; 540 while (p2->p_flag & P_PPWAIT) 541 msleep(td->td_proc, &p2->p_mtx, PWAIT, "ppwait", 0); 542 PROC_UNLOCK(p2); 543 } 544 545 return (0); 546} 547 548/* XXX move */ 549struct l_mmap_argv { 550 l_caddr_t addr; 551 l_int len; 552 l_int prot; 553 l_int flags; 554 l_int fd; 555 l_int pos; 556}; 557 558#define STACK_SIZE (2 * 1024 * 1024) 559#define GUARD_SIZE (4 * PAGE_SIZE) 560 561static int linux_mmap_common(struct thread *, struct l_mmap_argv *); 562 563int 564linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 565{ 566 struct l_mmap_argv linux_args; 567 568#ifdef DEBUG 569 if (ldebug(mmap2)) 570 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"), 571 (void *)args->addr, args->len, args->prot, 572 args->flags, args->fd, args->pgoff); 573#endif 574 575 linux_args.addr = (l_caddr_t)args->addr; 576 linux_args.len = args->len; 577 linux_args.prot = args->prot; 578 linux_args.flags = args->flags; 579 linux_args.fd = args->fd; 580 linux_args.pos = args->pgoff * PAGE_SIZE; 581 582 return (linux_mmap_common(td, &linux_args)); 583} 584 585int 586linux_mmap(struct thread *td, struct linux_mmap_args *args) 587{ 588 int error; 589 struct l_mmap_argv linux_args; 590 591 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 592 if (error) 593 return (error); 594 595#ifdef DEBUG 596 if (ldebug(mmap)) 597 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"), 598 (void *)linux_args.addr, linux_args.len, linux_args.prot, 599 linux_args.flags, linux_args.fd, linux_args.pos); 600#endif 601 602 return (linux_mmap_common(td, &linux_args)); 603} 604 605static int 606linux_mmap_common(struct thread *td, struct l_mmap_argv *linux_args) 607{ 608 struct proc *p = td->td_proc; 609 struct mmap_args /* { 610 caddr_t addr; 611 size_t len; 612 int prot; 613 int flags; 614 int fd; 615 long pad; 616 off_t pos; 617 } */ bsd_args; 618 int error; 619 struct file *fp; 620 621 error = 0; 622 bsd_args.flags = 0; 623 fp = NULL; 624 625 /* 626 * Linux mmap(2): 627 * You must specify exactly one of MAP_SHARED and MAP_PRIVATE 628 */ 629 if (! ((linux_args->flags & LINUX_MAP_SHARED) ^ 630 (linux_args->flags & LINUX_MAP_PRIVATE))) 631 return (EINVAL); 632 633 if (linux_args->flags & LINUX_MAP_SHARED) 634 bsd_args.flags |= MAP_SHARED; 635 if (linux_args->flags & LINUX_MAP_PRIVATE) 636 bsd_args.flags |= MAP_PRIVATE; 637 if (linux_args->flags & LINUX_MAP_FIXED) 638 bsd_args.flags |= MAP_FIXED; 639 if (linux_args->flags & LINUX_MAP_ANON) 640 bsd_args.flags |= MAP_ANON; 641 else 642 bsd_args.flags |= MAP_NOSYNC; 643 if (linux_args->flags & LINUX_MAP_GROWSDOWN) { 644 bsd_args.flags |= MAP_STACK; 645 646 /* 647 * The linux MAP_GROWSDOWN option does not limit auto 648 * growth of the region. Linux mmap with this option 649 * takes as addr the inital BOS, and as len, the initial 650 * region size. It can then grow down from addr without 651 * limit. However, linux threads has an implicit internal 652 * limit to stack size of STACK_SIZE. Its just not 653 * enforced explicitly in linux. But, here we impose 654 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack 655 * region, since we can do this with our mmap. 656 * 657 * Our mmap with MAP_STACK takes addr as the maximum 658 * downsize limit on BOS, and as len the max size of 659 * the region. It them maps the top SGROWSIZ bytes, 660 * and autgrows the region down, up to the limit 661 * in addr. 662 * 663 * If we don't use the MAP_STACK option, the effect 664 * of this code is to allocate a stack region of a 665 * fixed size of (STACK_SIZE - GUARD_SIZE). 666 */ 667 668 /* This gives us TOS */ 669 bsd_args.addr = linux_args->addr + linux_args->len; 670 671 if (bsd_args.addr > p->p_vmspace->vm_maxsaddr) { 672 /* 673 * Some linux apps will attempt to mmap 674 * thread stacks near the top of their 675 * address space. If their TOS is greater 676 * than vm_maxsaddr, vm_map_growstack() 677 * will confuse the thread stack with the 678 * process stack and deliver a SEGV if they 679 * attempt to grow the thread stack past their 680 * current stacksize rlimit. To avoid this, 681 * adjust vm_maxsaddr upwards to reflect 682 * the current stacksize rlimit rather 683 * than the maximum possible stacksize. 684 * It would be better to adjust the 685 * mmap'ed region, but some apps do not check 686 * mmap's return value. 687 */ 688 PROC_LOCK(p); 689 p->p_vmspace->vm_maxsaddr = (char *)USRSTACK - 690 lim_cur(p, RLIMIT_STACK); 691 PROC_UNLOCK(p); 692 } 693 694 /* This gives us our maximum stack size */ 695 if (linux_args->len > STACK_SIZE - GUARD_SIZE) 696 bsd_args.len = linux_args->len; 697 else 698 bsd_args.len = STACK_SIZE - GUARD_SIZE; 699 700 /* 701 * This gives us a new BOS. If we're using VM_STACK, then 702 * mmap will just map the top SGROWSIZ bytes, and let 703 * the stack grow down to the limit at BOS. If we're 704 * not using VM_STACK we map the full stack, since we 705 * don't have a way to autogrow it. 706 */ 707 bsd_args.addr -= bsd_args.len; 708 } else { 709 bsd_args.addr = linux_args->addr; 710 bsd_args.len = linux_args->len; 711 } 712 713 bsd_args.prot = linux_args->prot; 714 if (linux_args->flags & LINUX_MAP_ANON) 715 bsd_args.fd = -1; 716 else { 717 /* 718 * Linux follows Solaris mmap(2) description: 719 * The file descriptor fildes is opened with 720 * read permission, regardless of the 721 * protection options specified. 722 * If PROT_WRITE is specified, the application 723 * must have opened the file descriptor 724 * fildes with write permission unless 725 * MAP_PRIVATE is specified in the flag 726 * argument as described below. 727 */ 728 729 if ((error = fget(td, linux_args->fd, &fp)) != 0) 730 return (error); 731 if (fp->f_type != DTYPE_VNODE) { 732 fdrop(fp, td); 733 return (EINVAL); 734 } 735 736 /* Linux mmap() just fails for O_WRONLY files */ 737 if (! (fp->f_flag & FREAD)) { 738 fdrop(fp, td); 739 return (EACCES); 740 } 741 742 bsd_args.fd = linux_args->fd; 743 fdrop(fp, td); 744 } 745 bsd_args.pos = linux_args->pos; 746 bsd_args.pad = 0; 747 748#ifdef DEBUG 749 if (ldebug(mmap)) 750 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n", 751 __func__, 752 (void *)bsd_args.addr, bsd_args.len, bsd_args.prot, 753 bsd_args.flags, bsd_args.fd, (int)bsd_args.pos); 754#endif 755 error = mmap(td, &bsd_args); 756#ifdef DEBUG 757 if (ldebug(mmap)) 758 printf("-> %s() return: 0x%x (0x%08x)\n", 759 __func__, error, (u_int)td->td_retval[0]); 760#endif 761 return (error); 762} 763 764int 765linux_pipe(struct thread *td, struct linux_pipe_args *args) 766{ 767 int error; 768 int reg_edx; 769 770#ifdef DEBUG 771 if (ldebug(pipe)) 772 printf(ARGS(pipe, "*")); 773#endif 774 775 reg_edx = td->td_retval[1]; 776 error = pipe(td, 0); 777 if (error) { 778 td->td_retval[1] = reg_edx; 779 return (error); 780 } 781 782 error = copyout(td->td_retval, args->pipefds, 2*sizeof(int)); 783 if (error) { 784 td->td_retval[1] = reg_edx; 785 return (error); 786 } 787 788 td->td_retval[1] = reg_edx; 789 td->td_retval[0] = 0; 790 return (0); 791} 792 793int 794linux_ioperm(struct thread *td, struct linux_ioperm_args *args) 795{ 796 int error; 797 struct i386_ioperm_args iia; 798 799 iia.start = args->start; 800 iia.length = args->length; 801 iia.enable = args->enable; 802 mtx_lock(&Giant); 803 error = i386_set_ioperm(td, &iia); 804 mtx_unlock(&Giant); 805 return (error); 806} 807 808int 809linux_iopl(struct thread *td, struct linux_iopl_args *args) 810{ 811 int error; 812 813 if (args->level < 0 || args->level > 3) 814 return (EINVAL); 815 if ((error = suser(td)) != 0) 816 return (error); 817 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 818 return (error); 819 td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) | 820 (args->level * (PSL_IOPL / 3)); 821 return (0); 822} 823 824int 825linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap) 826{ 827 int error; 828 struct i386_ldt_args ldt; 829 struct l_descriptor ld; 830 union descriptor desc; 831 832 if (uap->ptr == NULL) 833 return (EINVAL); 834 835 switch (uap->func) { 836 case 0x00: /* read_ldt */ 837 ldt.start = 0; 838 ldt.descs = uap->ptr; 839 ldt.num = uap->bytecount / sizeof(union descriptor); 840 mtx_lock(&Giant); 841 error = i386_get_ldt(td, &ldt); 842 td->td_retval[0] *= sizeof(union descriptor); 843 mtx_unlock(&Giant); 844 break; 845 case 0x01: /* write_ldt */ 846 case 0x11: /* write_ldt */ 847 if (uap->bytecount != sizeof(ld)) 848 return (EINVAL); 849 850 error = copyin(uap->ptr, &ld, sizeof(ld)); 851 if (error) 852 return (error); 853 854 ldt.start = ld.entry_number; 855 ldt.descs = &desc; 856 ldt.num = 1; 857 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff); 858 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; 859 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff); 860 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; 861 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | 862 (ld.contents << 2); 863 desc.sd.sd_dpl = 3; 864 desc.sd.sd_p = (ld.seg_not_present ^ 1); 865 desc.sd.sd_xx = 0; 866 desc.sd.sd_def32 = ld.seg_32bit; 867 desc.sd.sd_gran = ld.limit_in_pages; 868 mtx_lock(&Giant); 869 error = i386_set_ldt(td, &ldt, &desc); 870 mtx_unlock(&Giant); 871 break; 872 default: 873 error = EINVAL; 874 break; 875 } 876 877 if (error == EOPNOTSUPP) { 878 printf("linux: modify_ldt needs kernel option USER_LDT\n"); 879 error = ENOSYS; 880 } 881 882 return (error); 883} 884 885int 886linux_sigaction(struct thread *td, struct linux_sigaction_args *args) 887{ 888 l_osigaction_t osa; 889 l_sigaction_t act, oact; 890 int error; 891 892#ifdef DEBUG 893 if (ldebug(sigaction)) 894 printf(ARGS(sigaction, "%d, %p, %p"), 895 args->sig, (void *)args->nsa, (void *)args->osa); 896#endif 897 898 if (args->nsa != NULL) { 899 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t)); 900 if (error) 901 return (error); 902 act.lsa_handler = osa.lsa_handler; 903 act.lsa_flags = osa.lsa_flags; 904 act.lsa_restorer = osa.lsa_restorer; 905 LINUX_SIGEMPTYSET(act.lsa_mask); 906 act.lsa_mask.__bits[0] = osa.lsa_mask; 907 } 908 909 error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL, 910 args->osa ? &oact : NULL); 911 912 if (args->osa != NULL && !error) { 913 osa.lsa_handler = oact.lsa_handler; 914 osa.lsa_flags = oact.lsa_flags; 915 osa.lsa_restorer = oact.lsa_restorer; 916 osa.lsa_mask = oact.lsa_mask.__bits[0]; 917 error = copyout(&osa, args->osa, sizeof(l_osigaction_t)); 918 } 919 920 return (error); 921} 922 923/* 924 * Linux has two extra args, restart and oldmask. We dont use these, 925 * but it seems that "restart" is actually a context pointer that 926 * enables the signal to happen with a different register set. 927 */ 928int 929linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args) 930{ 931 sigset_t sigmask; 932 l_sigset_t mask; 933 934#ifdef DEBUG 935 if (ldebug(sigsuspend)) 936 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask); 937#endif 938 939 LINUX_SIGEMPTYSET(mask); 940 mask.__bits[0] = args->mask; 941 linux_to_bsd_sigset(&mask, &sigmask); 942 return (kern_sigsuspend(td, sigmask)); 943} 944 945int 946linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 947{ 948 l_sigset_t lmask; 949 sigset_t sigmask; 950 int error; 951 952#ifdef DEBUG 953 if (ldebug(rt_sigsuspend)) 954 printf(ARGS(rt_sigsuspend, "%p, %d"), 955 (void *)uap->newset, uap->sigsetsize); 956#endif 957 958 if (uap->sigsetsize != sizeof(l_sigset_t)) 959 return (EINVAL); 960 961 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 962 if (error) 963 return (error); 964 965 linux_to_bsd_sigset(&lmask, &sigmask); 966 return (kern_sigsuspend(td, sigmask)); 967} 968 969int 970linux_pause(struct thread *td, struct linux_pause_args *args) 971{ 972 struct proc *p = td->td_proc; 973 sigset_t sigmask; 974 975#ifdef DEBUG 976 if (ldebug(pause)) 977 printf(ARGS(pause, "")); 978#endif 979 980 PROC_LOCK(p); 981 sigmask = td->td_sigmask; 982 PROC_UNLOCK(p); 983 return (kern_sigsuspend(td, sigmask)); 984} 985 986int 987linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 988{ 989 stack_t ss, oss; 990 l_stack_t lss; 991 int error; 992 993#ifdef DEBUG 994 if (ldebug(sigaltstack)) 995 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss); 996#endif 997 998 if (uap->uss != NULL) { 999 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 1000 if (error) 1001 return (error); 1002 1003 ss.ss_sp = lss.ss_sp; 1004 ss.ss_size = lss.ss_size; 1005 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 1006 } 1007 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 1008 (uap->uoss != NULL) ? &oss : NULL); 1009 if (!error && uap->uoss != NULL) { 1010 lss.ss_sp = oss.ss_sp; 1011 lss.ss_size = oss.ss_size; 1012 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 1013 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 1014 } 1015 1016 return (error); 1017} 1018 1019int 1020linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args) 1021{ 1022 struct ftruncate_args sa; 1023 1024#ifdef DEBUG 1025 if (ldebug(ftruncate64)) 1026 printf(ARGS(ftruncate64, "%u, %jd"), args->fd, 1027 (intmax_t)args->length); 1028#endif 1029 1030 sa.fd = args->fd; 1031 sa.pad = 0; 1032 sa.length = args->length; 1033 return ftruncate(td, &sa); 1034} 1035 1036int 1037linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) 1038{ 1039 struct l_user_desc info; 1040 int error; 1041 int idx; 1042 int a[2]; 1043 struct segment_descriptor sd; 1044 1045 error = copyin(args->desc, &info, sizeof(struct l_user_desc)); 1046 if (error) 1047 return (error); 1048 1049#ifdef DEBUG 1050 if (ldebug(set_thread_area)) 1051 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, %i, %i, %i\n"), 1052 info.entry_number, 1053 info.base_addr, 1054 info.limit, 1055 info.seg_32bit, 1056 info.contents, 1057 info.read_exec_only, 1058 info.limit_in_pages, 1059 info.seg_not_present, 1060 info.useable); 1061#endif 1062 1063 idx = info.entry_number; 1064 /* 1065 * Semantics of linux version: every thread in the system has array 1066 * of 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This 1067 * syscall loads one of the selected tls decriptors with a value 1068 * and also loads GDT descriptors 6, 7 and 8 with the content of the per-thread 1069 * descriptors. 1070 * 1071 * Semantics of fbsd version: I think we can ignore that linux has 3 per-thread 1072 * descriptors and use just the 1st one. The tls_array[] is used only in 1073 * set/get-thread_area() syscalls and for loading the GDT descriptors. In fbsd 1074 * we use just one GDT descriptor for TLS so we will load just one. 1075 * XXX: this doesnt work when user-space process tries to use more then 1 TLS segment 1076 * comment in the linux sources says wine might do that. 1077 */ 1078 1079 /* 1080 * we support just GLIBC TLS now 1081 * we should let 3 proceed as well because we use this segment so 1082 * if code does two subsequent calls it should succeed 1083 */ 1084 if (idx != 6 && idx != -1 && idx != 3) 1085 return (EINVAL); 1086 1087 /* 1088 * we have to copy out the GDT entry we use 1089 * FreeBSD uses GDT entry #3 for storing %gs so load that 1090 * XXX: what if userspace program doesnt check this value and tries 1091 * to use 6, 7 or 8? 1092 */ 1093 idx = info.entry_number = 3; 1094 error = copyout(&info, args->desc, sizeof(struct l_user_desc)); 1095 if (error) 1096 return (error); 1097 1098 if (LDT_empty(&info)) { 1099 a[0] = 0; 1100 a[1] = 0; 1101 } else { 1102 a[0] = LDT_entry_a(&info); 1103 a[1] = LDT_entry_b(&info); 1104 } 1105 1106 memcpy(&sd, &a, sizeof(a)); 1107#ifdef DEBUG 1108 if (ldebug(set_thread_area)) 1109 printf("Segment created in set_thread_area: lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, type: %i, dpl: %i, p: %i, xx: %i, def32: %i, gran: %i\n", sd.sd_lobase, 1110 sd.sd_hibase, 1111 sd.sd_lolimit, 1112 sd.sd_hilimit, 1113 sd.sd_type, 1114 sd.sd_dpl, 1115 sd.sd_p, 1116 sd.sd_xx, 1117 sd.sd_def32, 1118 sd.sd_gran); 1119#endif 1120 1121 /* this is taken from i386 version of cpu_set_user_tls() */ 1122 critical_enter(); 1123 /* set %gs */ 1124 td->td_pcb->pcb_gsd = sd; 1125 PCPU_GET(fsgs_gdt)[1] = sd; 1126 load_gs(GSEL(GUGS_SEL, SEL_UPL)); 1127 critical_exit(); 1128 1129 return (0); 1130} 1131 1132int 1133linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args) 1134{ 1135 1136 struct l_user_desc info; 1137 int error; 1138 int idx; 1139 struct l_desc_struct desc; 1140 struct segment_descriptor sd; 1141 1142#ifdef DEBUG 1143 if (ldebug(get_thread_area)) 1144 printf(ARGS(get_thread_area, "%p"), args->desc); 1145#endif 1146 1147 error = copyin(args->desc, &info, sizeof(struct l_user_desc)); 1148 if (error) 1149 return (error); 1150 1151 idx = info.entry_number; 1152 /* XXX: I am not sure if we want 3 to be allowed too. */ 1153 if (idx != 6 && idx != 3) 1154 return (EINVAL); 1155 1156 idx = 3; 1157 1158 memset(&info, 0, sizeof(info)); 1159 1160 sd = PCPU_GET(fsgs_gdt)[1]; 1161 1162 memcpy(&desc, &sd, sizeof(desc)); 1163 1164 info.entry_number = idx; 1165 info.base_addr = GET_BASE(&desc); 1166 info.limit = GET_LIMIT(&desc); 1167 info.seg_32bit = GET_32BIT(&desc); 1168 info.contents = GET_CONTENTS(&desc); 1169 info.read_exec_only = !GET_WRITABLE(&desc); 1170 info.limit_in_pages = GET_LIMIT_PAGES(&desc); 1171 info.seg_not_present = !GET_PRESENT(&desc); 1172 info.useable = GET_USEABLE(&desc); 1173 1174 error = copyout(&info, args->desc, sizeof(struct l_user_desc)); 1175 if (error) 1176 return (EFAULT); 1177 1178 return (0); 1179} 1180 1181/* copied from kern/kern_time.c */ 1182int 1183linux_timer_create(struct thread *td, struct linux_timer_create_args *args) 1184{ 1185 return ktimer_create(td, (struct ktimer_create_args *) args); 1186} 1187 1188int 1189linux_timer_settime(struct thread *td, struct linux_timer_settime_args *args) 1190{ 1191 return ktimer_settime(td, (struct ktimer_settime_args *) args); 1192} 1193 1194int 1195linux_timer_gettime(struct thread *td, struct linux_timer_gettime_args *args) 1196{ 1197 return ktimer_gettime(td, (struct ktimer_gettime_args *) args); 1198} 1199 1200int 1201linux_timer_getoverrun(struct thread *td, struct linux_timer_getoverrun_args *args) 1202{ 1203 return ktimer_getoverrun(td, (struct ktimer_getoverrun_args *) args); 1204} 1205 1206int 1207linux_timer_delete(struct thread *td, struct linux_timer_delete_args *args) 1208{ 1209 return ktimer_delete(td, (struct ktimer_delete_args *) args); 1210} 1211 1212/* XXX: this wont work with module - convert it */ 1213int 1214linux_mq_open(struct thread *td, struct linux_mq_open_args *args) 1215{ 1216#ifdef P1003_1B_MQUEUE 1217 return kmq_open(td, (struct kmq_open_args *) args); 1218#else 1219 return (ENOSYS); 1220#endif 1221} 1222 1223int 1224linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args) 1225{ 1226#ifdef P1003_1B_MQUEUE 1227 return kmq_unlink(td, (struct kmq_unlink_args *) args); 1228#else 1229 return (ENOSYS); 1230#endif 1231} 1232 1233int 1234linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args) 1235{ 1236#ifdef P1003_1B_MQUEUE 1237 return kmq_timedsend(td, (struct kmq_timedsend_args *) args); 1238#else 1239 return (ENOSYS); 1240#endif 1241} 1242 1243int 1244linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args) 1245{ 1246#ifdef P1003_1B_MQUEUE 1247 return kmq_timedreceive(td, (struct kmq_timedreceive_args *) args); 1248#else 1249 return (ENOSYS); 1250#endif 1251} 1252 1253int 1254linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args) 1255{ 1256#ifdef P1003_1B_MQUEUE 1257 return kmq_notify(td, (struct kmq_notify_args *) args); 1258#else 1259 return (ENOSYS); 1260#endif 1261} 1262 1263int 1264linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args) 1265{ 1266#ifdef P1003_1B_MQUEUE 1267 return kmq_setattr(td, (struct kmq_setattr_args *) args); 1268#else 1269 return (ENOSYS); 1270#endif 1271} 1272 1273