Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_machdep.c
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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: releng/6.3/sys/i386/linux/linux_machdep.c 171303 2007-07-08 12:20:36Z 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/proc.h> 42 #include <sys/resource.h> 43 #include <sys/resourcevar.h> 44 #include <sys/signalvar.h> 45 #include <sys/syscallsubr.h> 46 #include <sys/sysproto.h> 47 #include <sys/unistd.h> 48 49 #include <machine/frame.h> 50 #include <machine/psl.h> 51 #include <machine/segments.h> 52 #include <machine/sysarch.h> 53 54 #include <vm/vm.h> 55 #include <vm/pmap.h> 56 #include <vm/vm_map.h> 57 58 #include <i386/linux/linux.h> 59 #include <i386/linux/linux_proto.h> 60 #include <compat/linux/linux_ipc.h> 61 #include <compat/linux/linux_signal.h> 62 #include <compat/linux/linux_util.h> 63 64 struct l_descriptor { 65 l_uint entry_number; 66 l_ulong base_addr; 67 l_uint limit; 68 l_uint seg_32bit:1; 69 l_uint contents:2; 70 l_uint read_exec_only:1; 71 l_uint limit_in_pages:1; 72 l_uint seg_not_present:1; 73 l_uint useable:1; 74 }; 75 76 struct l_old_select_argv { 77 l_int nfds; 78 l_fd_set *readfds; 79 l_fd_set *writefds; 80 l_fd_set *exceptfds; 81 struct l_timeval *timeout; 82 }; 83 84 int 85 linux_to_bsd_sigaltstack(int lsa) 86 { 87 int bsa = 0; 88 89 if (lsa & LINUX_SS_DISABLE) 90 bsa |= SS_DISABLE; 91 if (lsa & LINUX_SS_ONSTACK) 92 bsa |= SS_ONSTACK; 93 return (bsa); 94 } 95 96 int 97 bsd_to_linux_sigaltstack(int bsa) 98 { 99 int lsa = 0; 100 101 if (bsa & SS_DISABLE) 102 lsa |= LINUX_SS_DISABLE; 103 if (bsa & SS_ONSTACK) 104 lsa |= LINUX_SS_ONSTACK; 105 return (lsa); 106 } 107 108 int 109 linux_execve(struct thread *td, struct linux_execve_args *args) 110 { 111 int error; 112 char *newpath; 113 struct image_args eargs; 114 115 LCONVPATHEXIST(td, args->path, &newpath); 116 117 #ifdef DEBUG 118 if (ldebug(execve)) 119 printf(ARGS(execve, "%s"), newpath); 120 #endif 121 122 error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE, 123 args->argp, args->envp); 124 free(newpath, M_TEMP); 125 if (error == 0) 126 error = kern_execve(td, &eargs, NULL); 127 exec_free_args(&eargs); 128 return (error); 129 } 130 131 struct l_ipc_kludge { 132 struct l_msgbuf *msgp; 133 l_long msgtyp; 134 }; 135 136 int 137 linux_ipc(struct thread *td, struct linux_ipc_args *args) 138 { 139 140 switch (args->what & 0xFFFF) { 141 case LINUX_SEMOP: { 142 struct linux_semop_args a; 143 144 a.semid = args->arg1; 145 a.tsops = args->ptr; 146 a.nsops = args->arg2; 147 return (linux_semop(td, &a)); 148 } 149 case LINUX_SEMGET: { 150 struct linux_semget_args a; 151 152 a.key = args->arg1; 153 a.nsems = args->arg2; 154 a.semflg = args->arg3; 155 return (linux_semget(td, &a)); 156 } 157 case LINUX_SEMCTL: { 158 struct linux_semctl_args a; 159 int error; 160 161 a.semid = args->arg1; 162 a.semnum = args->arg2; 163 a.cmd = args->arg3; 164 error = copyin(args->ptr, &a.arg, sizeof(a.arg)); 165 if (error) 166 return (error); 167 return (linux_semctl(td, &a)); 168 } 169 case LINUX_MSGSND: { 170 struct linux_msgsnd_args a; 171 172 a.msqid = args->arg1; 173 a.msgp = args->ptr; 174 a.msgsz = args->arg2; 175 a.msgflg = args->arg3; 176 return (linux_msgsnd(td, &a)); 177 } 178 case LINUX_MSGRCV: { 179 struct linux_msgrcv_args a; 180 181 a.msqid = args->arg1; 182 a.msgsz = args->arg2; 183 a.msgflg = args->arg3; 184 if ((args->what >> 16) == 0) { 185 struct l_ipc_kludge tmp; 186 int error; 187 188 if (args->ptr == NULL) 189 return (EINVAL); 190 error = copyin(args->ptr, &tmp, sizeof(tmp)); 191 if (error) 192 return (error); 193 a.msgp = tmp.msgp; 194 a.msgtyp = tmp.msgtyp; 195 } else { 196 a.msgp = args->ptr; 197 a.msgtyp = args->arg5; 198 } 199 return (linux_msgrcv(td, &a)); 200 } 201 case LINUX_MSGGET: { 202 struct linux_msgget_args a; 203 204 a.key = args->arg1; 205 a.msgflg = args->arg2; 206 return (linux_msgget(td, &a)); 207 } 208 case LINUX_MSGCTL: { 209 struct linux_msgctl_args a; 210 211 a.msqid = args->arg1; 212 a.cmd = args->arg2; 213 a.buf = args->ptr; 214 return (linux_msgctl(td, &a)); 215 } 216 case LINUX_SHMAT: { 217 struct linux_shmat_args a; 218 219 a.shmid = args->arg1; 220 a.shmaddr = args->ptr; 221 a.shmflg = args->arg2; 222 a.raddr = (l_ulong *)args->arg3; 223 return (linux_shmat(td, &a)); 224 } 225 case LINUX_SHMDT: { 226 struct linux_shmdt_args a; 227 228 a.shmaddr = args->ptr; 229 return (linux_shmdt(td, &a)); 230 } 231 case LINUX_SHMGET: { 232 struct linux_shmget_args a; 233 234 a.key = args->arg1; 235 a.size = args->arg2; 236 a.shmflg = args->arg3; 237 return (linux_shmget(td, &a)); 238 } 239 case LINUX_SHMCTL: { 240 struct linux_shmctl_args a; 241 242 a.shmid = args->arg1; 243 a.cmd = args->arg2; 244 a.buf = args->ptr; 245 return (linux_shmctl(td, &a)); 246 } 247 default: 248 break; 249 } 250 251 return (EINVAL); 252 } 253 254 int 255 linux_old_select(struct thread *td, struct linux_old_select_args *args) 256 { 257 struct l_old_select_argv linux_args; 258 struct linux_select_args newsel; 259 int error; 260 261 #ifdef DEBUG 262 if (ldebug(old_select)) 263 printf(ARGS(old_select, "%p"), args->ptr); 264 #endif 265 266 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 267 if (error) 268 return (error); 269 270 newsel.nfds = linux_args.nfds; 271 newsel.readfds = linux_args.readfds; 272 newsel.writefds = linux_args.writefds; 273 newsel.exceptfds = linux_args.exceptfds; 274 newsel.timeout = linux_args.timeout; 275 return (linux_select(td, &newsel)); 276 } 277 278 int 279 linux_fork(struct thread *td, struct linux_fork_args *args) 280 { 281 int error; 282 283 #ifdef DEBUG 284 if (ldebug(fork)) 285 printf(ARGS(fork, "")); 286 #endif 287 288 if ((error = fork(td, (struct fork_args *)args)) != 0) 289 return (error); 290 291 if (td->td_retval[1] == 1) 292 td->td_retval[0] = 0; 293 return (0); 294 } 295 296 int 297 linux_vfork(struct thread *td, struct linux_vfork_args *args) 298 { 299 int error; 300 301 #ifdef DEBUG 302 if (ldebug(vfork)) 303 printf(ARGS(vfork, "")); 304 #endif 305 306 if ((error = vfork(td, (struct vfork_args *)args)) != 0) 307 return (error); 308 /* Are we the child? */ 309 if (td->td_retval[1] == 1) 310 td->td_retval[0] = 0; 311 return (0); 312 } 313 314 #define CLONE_VM 0x100 315 #define CLONE_FS 0x200 316 #define CLONE_FILES 0x400 317 #define CLONE_SIGHAND 0x800 318 #define CLONE_PID 0x1000 319 #define CLONE_THREAD 0x10000 320 321 #define THREADING_FLAGS (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 322 323 int 324 linux_clone(struct thread *td, struct linux_clone_args *args) 325 { 326 int error, ff = RFPROC | RFSTOPPED; 327 struct proc *p2; 328 struct thread *td2; 329 int exit_signal; 330 331 #ifdef DEBUG 332 if (ldebug(clone)) { 333 printf(ARGS(clone, "flags %x, stack %x"), 334 (unsigned int)args->flags, (unsigned int)args->stack); 335 if (args->flags & CLONE_PID) 336 printf(LMSG("CLONE_PID not yet supported")); 337 } 338 #endif 339 340 if (!args->stack) 341 return (EINVAL); 342 343 exit_signal = args->flags & 0x000000ff; 344 if (exit_signal >= LINUX_NSIG) 345 return (EINVAL); 346 347 if (exit_signal <= LINUX_SIGTBLSZ) 348 exit_signal = linux_to_bsd_signal[_SIG_IDX(exit_signal)]; 349 350 if (args->flags & CLONE_VM) 351 ff |= RFMEM; 352 if (args->flags & CLONE_SIGHAND) 353 ff |= RFSIGSHARE; 354 if (!(args->flags & CLONE_FILES)) 355 ff |= RFFDG; 356 357 /* 358 * Attempt to detect when linux_clone(2) is used for creating 359 * kernel threads. Unfortunately despite the existence of the 360 * CLONE_THREAD flag, version of linuxthreads package used in 361 * most popular distros as of beginning of 2005 doesn't make 362 * any use of it. Therefore, this detection relies on 363 * empirical observation that linuxthreads sets certain 364 * combination of flags, so that we can make more or less 365 * precise detection and notify the FreeBSD kernel that several 366 * processes are in fact part of the same threading group, so 367 * that special treatment is necessary for signal delivery 368 * between those processes and fd locking. 369 */ 370 if ((args->flags & 0xffffff00) == THREADING_FLAGS) 371 ff |= RFTHREAD; 372 373 error = fork1(td, ff, 0, &p2); 374 if (error) 375 return (error); 376 377 378 PROC_LOCK(p2); 379 p2->p_sigparent = exit_signal; 380 PROC_UNLOCK(p2); 381 td2 = FIRST_THREAD_IN_PROC(p2); 382 td2->td_frame->tf_esp = (unsigned int)args->stack; 383 384 #ifdef DEBUG 385 if (ldebug(clone)) 386 printf(LMSG("clone: successful rfork to %ld, stack %p sig = %d"), 387 (long)p2->p_pid, args->stack, exit_signal); 388 #endif 389 390 /* 391 * Make this runnable after we are finished with it. 392 */ 393 mtx_lock_spin(&sched_lock); 394 TD_SET_CAN_RUN(td2); 395 setrunqueue(td2, SRQ_BORING); 396 mtx_unlock_spin(&sched_lock); 397 398 td->td_retval[0] = p2->p_pid; 399 td->td_retval[1] = 0; 400 return (0); 401 } 402 403 #define STACK_SIZE (2 * 1024 * 1024) 404 #define GUARD_SIZE (4 * PAGE_SIZE) 405 406 static int linux_mmap_common(struct thread *, struct l_mmap_argv *); 407 408 int 409 linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 410 { 411 struct l_mmap_argv linux_args; 412 413 #ifdef DEBUG 414 if (ldebug(mmap2)) 415 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"), 416 (void *)args->addr, args->len, args->prot, 417 args->flags, args->fd, args->pgoff); 418 #endif 419 420 linux_args.addr = args->addr; 421 linux_args.len = args->len; 422 linux_args.prot = args->prot; 423 linux_args.flags = args->flags; 424 linux_args.fd = args->fd; 425 linux_args.pgoff = args->pgoff * PAGE_SIZE; 426 427 return (linux_mmap_common(td, &linux_args)); 428 } 429 430 int 431 linux_mmap(struct thread *td, struct linux_mmap_args *args) 432 { 433 int error; 434 struct l_mmap_argv linux_args; 435 436 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 437 if (error) 438 return (error); 439 440 #ifdef DEBUG 441 if (ldebug(mmap)) 442 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"), 443 (void *)linux_args.addr, linux_args.len, linux_args.prot, 444 linux_args.flags, linux_args.fd, linux_args.pgoff); 445 #endif 446 447 return (linux_mmap_common(td, &linux_args)); 448 } 449 450 static int 451 linux_mmap_common(struct thread *td, struct l_mmap_argv *linux_args) 452 { 453 struct proc *p = td->td_proc; 454 struct mmap_args /* { 455 caddr_t addr; 456 size_t len; 457 int prot; 458 int flags; 459 int fd; 460 long pad; 461 off_t pos; 462 } */ bsd_args; 463 int error; 464 struct file *fp; 465 466 error = 0; 467 bsd_args.flags = 0; 468 fp = NULL; 469 470 /* 471 * Linux mmap(2): 472 * You must specify exactly one of MAP_SHARED and MAP_PRIVATE 473 */ 474 if (! ((linux_args->flags & LINUX_MAP_SHARED) ^ 475 (linux_args->flags & LINUX_MAP_PRIVATE))) 476 return (EINVAL); 477 478 if (linux_args->flags & LINUX_MAP_SHARED) 479 bsd_args.flags |= MAP_SHARED; 480 if (linux_args->flags & LINUX_MAP_PRIVATE) 481 bsd_args.flags |= MAP_PRIVATE; 482 if (linux_args->flags & LINUX_MAP_FIXED) 483 bsd_args.flags |= MAP_FIXED; 484 if (linux_args->flags & LINUX_MAP_ANON) 485 bsd_args.flags |= MAP_ANON; 486 else 487 bsd_args.flags |= MAP_NOSYNC; 488 if (linux_args->flags & LINUX_MAP_GROWSDOWN) 489 bsd_args.flags |= MAP_STACK; 490 491 /* 492 * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC 493 * on Linux/i386. We do this to ensure maximum compatibility. 494 * Linux/ia64 does the same in i386 emulation mode. 495 */ 496 bsd_args.prot = linux_args->prot; 497 if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC)) 498 bsd_args.prot |= PROT_READ | PROT_EXEC; 499 500 /* Linux does not check file descriptor when MAP_ANONYMOUS is set. */ 501 bsd_args.fd = (bsd_args.flags & MAP_ANON) ? -1 : linux_args->fd; 502 if (bsd_args.fd != -1) { 503 /* 504 * Linux follows Solaris mmap(2) description: 505 * The file descriptor fildes is opened with 506 * read permission, regardless of the 507 * protection options specified. 508 */ 509 510 if ((error = fget(td, bsd_args.fd, &fp)) != 0) 511 return (error); 512 if (fp->f_type != DTYPE_VNODE) { 513 fdrop(fp, td); 514 return (EINVAL); 515 } 516 517 /* Linux mmap() just fails for O_WRONLY files */ 518 if (!(fp->f_flag & FREAD)) { 519 fdrop(fp, td); 520 return (EACCES); 521 } 522 523 fdrop(fp, td); 524 } 525 526 if (linux_args->flags & LINUX_MAP_GROWSDOWN) { 527 /* 528 * The linux MAP_GROWSDOWN option does not limit auto 529 * growth of the region. Linux mmap with this option 530 * takes as addr the inital BOS, and as len, the initial 531 * region size. It can then grow down from addr without 532 * limit. However, linux threads has an implicit internal 533 * limit to stack size of STACK_SIZE. Its just not 534 * enforced explicitly in linux. But, here we impose 535 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack 536 * region, since we can do this with our mmap. 537 * 538 * Our mmap with MAP_STACK takes addr as the maximum 539 * downsize limit on BOS, and as len the max size of 540 * the region. It them maps the top SGROWSIZ bytes, 541 * and auto grows the region down, up to the limit 542 * in addr. 543 * 544 * If we don't use the MAP_STACK option, the effect 545 * of this code is to allocate a stack region of a 546 * fixed size of (STACK_SIZE - GUARD_SIZE). 547 */ 548 549 if ((caddr_t)PTRIN(linux_args->addr) + linux_args->len > 550 p->p_vmspace->vm_maxsaddr) { 551 /* 552 * Some linux apps will attempt to mmap 553 * thread stacks near the top of their 554 * address space. If their TOS is greater 555 * than vm_maxsaddr, vm_map_growstack() 556 * will confuse the thread stack with the 557 * process stack and deliver a SEGV if they 558 * attempt to grow the thread stack past their 559 * current stacksize rlimit. To avoid this, 560 * adjust vm_maxsaddr upwards to reflect 561 * the current stacksize rlimit rather 562 * than the maximum possible stacksize. 563 * It would be better to adjust the 564 * mmap'ed region, but some apps do not check 565 * mmap's return value. 566 */ 567 PROC_LOCK(p); 568 p->p_vmspace->vm_maxsaddr = (char *)USRSTACK - 569 lim_cur(p, RLIMIT_STACK); 570 PROC_UNLOCK(p); 571 } 572 573 /* This gives us our maximum stack size */ 574 if (linux_args->len > STACK_SIZE - GUARD_SIZE) 575 bsd_args.len = linux_args->len; 576 else 577 bsd_args.len = STACK_SIZE - GUARD_SIZE; 578 579 /* 580 * This gives us a new BOS. If we're using VM_STACK, then 581 * mmap will just map the top SGROWSIZ bytes, and let 582 * the stack grow down to the limit at BOS. If we're 583 * not using VM_STACK we map the full stack, since we 584 * don't have a way to autogrow it. 585 */ 586 bsd_args.addr = (caddr_t)PTRIN(linux_args->addr) - 587 bsd_args.len; 588 } else { 589 bsd_args.addr = (caddr_t)PTRIN(linux_args->addr); 590 bsd_args.len = linux_args->len; 591 } 592 bsd_args.pos = linux_args->pgoff; 593 bsd_args.pad = 0; 594 595 #ifdef DEBUG 596 if (ldebug(mmap)) 597 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n", 598 __func__, 599 (void *)bsd_args.addr, bsd_args.len, bsd_args.prot, 600 bsd_args.flags, bsd_args.fd, (int)bsd_args.pos); 601 #endif 602 error = mmap(td, &bsd_args); 603 #ifdef DEBUG 604 if (ldebug(mmap)) 605 printf("-> %s() return: 0x%x (0x%08x)\n", 606 __func__, error, (u_int)td->td_retval[0]); 607 #endif 608 return (error); 609 } 610 611 int 612 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) 613 { 614 struct mprotect_args bsd_args; 615 616 bsd_args.addr = uap->addr; 617 bsd_args.len = uap->len; 618 bsd_args.prot = uap->prot; 619 if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC)) 620 bsd_args.prot |= PROT_READ | PROT_EXEC; 621 return (mprotect(td, &bsd_args)); 622 } 623 624 int 625 linux_pipe(struct thread *td, struct linux_pipe_args *args) 626 { 627 int error; 628 int reg_edx; 629 630 #ifdef DEBUG 631 if (ldebug(pipe)) 632 printf(ARGS(pipe, "*")); 633 #endif 634 635 reg_edx = td->td_retval[1]; 636 error = pipe(td, 0); 637 if (error) { 638 td->td_retval[1] = reg_edx; 639 return (error); 640 } 641 642 error = copyout(td->td_retval, args->pipefds, 2*sizeof(int)); 643 if (error) { 644 td->td_retval[1] = reg_edx; 645 return (error); 646 } 647 648 td->td_retval[1] = reg_edx; 649 td->td_retval[0] = 0; 650 return (0); 651 } 652 653 int 654 linux_ioperm(struct thread *td, struct linux_ioperm_args *args) 655 { 656 int error; 657 struct i386_ioperm_args iia; 658 659 iia.start = args->start; 660 iia.length = args->length; 661 iia.enable = args->enable; 662 mtx_lock(&Giant); 663 error = i386_set_ioperm(td, &iia); 664 mtx_unlock(&Giant); 665 return (error); 666 } 667 668 int 669 linux_iopl(struct thread *td, struct linux_iopl_args *args) 670 { 671 int error; 672 673 if (args->level < 0 || args->level > 3) 674 return (EINVAL); 675 if ((error = suser(td)) != 0) 676 return (error); 677 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 678 return (error); 679 td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) | 680 (args->level * (PSL_IOPL / 3)); 681 return (0); 682 } 683 684 int 685 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap) 686 { 687 int error; 688 struct i386_ldt_args ldt; 689 struct l_descriptor ld; 690 union descriptor desc; 691 692 if (uap->ptr == NULL) 693 return (EINVAL); 694 695 switch (uap->func) { 696 case 0x00: /* read_ldt */ 697 ldt.start = 0; 698 ldt.descs = uap->ptr; 699 ldt.num = uap->bytecount / sizeof(union descriptor); 700 mtx_lock(&Giant); 701 error = i386_get_ldt(td, &ldt); 702 td->td_retval[0] *= sizeof(union descriptor); 703 mtx_unlock(&Giant); 704 break; 705 case 0x01: /* write_ldt */ 706 case 0x11: /* write_ldt */ 707 if (uap->bytecount != sizeof(ld)) 708 return (EINVAL); 709 710 error = copyin(uap->ptr, &ld, sizeof(ld)); 711 if (error) 712 return (error); 713 714 ldt.start = ld.entry_number; 715 ldt.descs = &desc; 716 ldt.num = 1; 717 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff); 718 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; 719 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff); 720 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; 721 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | 722 (ld.contents << 2); 723 desc.sd.sd_dpl = 3; 724 desc.sd.sd_p = (ld.seg_not_present ^ 1); 725 desc.sd.sd_xx = 0; 726 desc.sd.sd_def32 = ld.seg_32bit; 727 desc.sd.sd_gran = ld.limit_in_pages; 728 mtx_lock(&Giant); 729 error = i386_set_ldt(td, &ldt, &desc); 730 mtx_unlock(&Giant); 731 break; 732 default: 733 error = EINVAL; 734 break; 735 } 736 737 if (error == EOPNOTSUPP) { 738 printf("linux: modify_ldt needs kernel option USER_LDT\n"); 739 error = ENOSYS; 740 } 741 742 return (error); 743 } 744 745 int 746 linux_sigaction(struct thread *td, struct linux_sigaction_args *args) 747 { 748 l_osigaction_t osa; 749 l_sigaction_t act, oact; 750 int error; 751 752 #ifdef DEBUG 753 if (ldebug(sigaction)) 754 printf(ARGS(sigaction, "%d, %p, %p"), 755 args->sig, (void *)args->nsa, (void *)args->osa); 756 #endif 757 758 if (args->nsa != NULL) { 759 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t)); 760 if (error) 761 return (error); 762 act.lsa_handler = osa.lsa_handler; 763 act.lsa_flags = osa.lsa_flags; 764 act.lsa_restorer = osa.lsa_restorer; 765 LINUX_SIGEMPTYSET(act.lsa_mask); 766 act.lsa_mask.__bits[0] = osa.lsa_mask; 767 } 768 769 error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL, 770 args->osa ? &oact : NULL); 771 772 if (args->osa != NULL && !error) { 773 osa.lsa_handler = oact.lsa_handler; 774 osa.lsa_flags = oact.lsa_flags; 775 osa.lsa_restorer = oact.lsa_restorer; 776 osa.lsa_mask = oact.lsa_mask.__bits[0]; 777 error = copyout(&osa, args->osa, sizeof(l_osigaction_t)); 778 } 779 780 return (error); 781 } 782 783 /* 784 * Linux has two extra args, restart and oldmask. We dont use these, 785 * but it seems that "restart" is actually a context pointer that 786 * enables the signal to happen with a different register set. 787 */ 788 int 789 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args) 790 { 791 sigset_t sigmask; 792 l_sigset_t mask; 793 794 #ifdef DEBUG 795 if (ldebug(sigsuspend)) 796 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask); 797 #endif 798 799 LINUX_SIGEMPTYSET(mask); 800 mask.__bits[0] = args->mask; 801 linux_to_bsd_sigset(&mask, &sigmask); 802 return (kern_sigsuspend(td, sigmask)); 803 } 804 805 int 806 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 807 { 808 l_sigset_t lmask; 809 sigset_t sigmask; 810 int error; 811 812 #ifdef DEBUG 813 if (ldebug(rt_sigsuspend)) 814 printf(ARGS(rt_sigsuspend, "%p, %d"), 815 (void *)uap->newset, uap->sigsetsize); 816 #endif 817 818 if (uap->sigsetsize != sizeof(l_sigset_t)) 819 return (EINVAL); 820 821 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 822 if (error) 823 return (error); 824 825 linux_to_bsd_sigset(&lmask, &sigmask); 826 return (kern_sigsuspend(td, sigmask)); 827 } 828 829 int 830 linux_pause(struct thread *td, struct linux_pause_args *args) 831 { 832 struct proc *p = td->td_proc; 833 sigset_t sigmask; 834 835 #ifdef DEBUG 836 if (ldebug(pause)) 837 printf(ARGS(pause, "")); 838 #endif 839 840 PROC_LOCK(p); 841 sigmask = td->td_sigmask; 842 PROC_UNLOCK(p); 843 return (kern_sigsuspend(td, sigmask)); 844 } 845 846 int 847 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 848 { 849 stack_t ss, oss; 850 l_stack_t lss; 851 int error; 852 853 #ifdef DEBUG 854 if (ldebug(sigaltstack)) 855 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss); 856 #endif 857 858 if (uap->uss != NULL) { 859 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 860 if (error) 861 return (error); 862 863 ss.ss_sp = lss.ss_sp; 864 ss.ss_size = lss.ss_size; 865 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 866 } 867 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 868 (uap->uoss != NULL) ? &oss : NULL); 869 if (!error && uap->uoss != NULL) { 870 lss.ss_sp = oss.ss_sp; 871 lss.ss_size = oss.ss_size; 872 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 873 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 874 } 875 876 return (error); 877 } 878 879 int 880 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args) 881 { 882 struct ftruncate_args sa; 883 884 #ifdef DEBUG 885 if (ldebug(ftruncate64)) 886 printf(ARGS(ftruncate64, "%u, %jd"), args->fd, 887 (intmax_t)args->length); 888 #endif 889 890 sa.fd = args->fd; 891 sa.pad = 0; 892 sa.length = args->length; 893 return ftruncate(td, &sa); 894 } 895 896 int 897 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) 898 { 899 /* 900 * Return an error code instead of raising a SIGSYS so that 901 * the caller will fall back to simpler LDT methods. 902 */ 903 return (ENOSYS); 904 } 905 906 int 907 linux_gettid(struct thread *td, struct linux_gettid_args *args) 908 { 909 910 td->td_retval[0] = td->td_proc->p_pid; 911 return (0); 912 } 913 914 int 915 linux_tkill(struct thread *td, struct linux_tkill_args *args) 916 { 917 918 return (linux_kill(td, (struct linux_kill_args *) args)); 919 } 920
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