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/6.2/sys/i386/linux/linux_machdep.c 162810 2006-09-29 19:05:24Z 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 relay fully 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 /* XXX move */ 404 struct l_mmap_argv { 405 l_caddr_t addr; 406 l_int len; 407 l_int prot; 408 l_int flags; 409 l_int fd; 410 l_int pos; 411 }; 412 413 #define STACK_SIZE (2 * 1024 * 1024) 414 #define GUARD_SIZE (4 * PAGE_SIZE) 415 416 static int linux_mmap_common(struct thread *, struct l_mmap_argv *); 417 418 int 419 linux_mmap2(struct thread *td, struct linux_mmap2_args *args) 420 { 421 struct l_mmap_argv linux_args; 422 423 #ifdef DEBUG 424 if (ldebug(mmap2)) 425 printf(ARGS(mmap2, "%p, %d, %d, 0x%08x, %d, %d"), 426 (void *)args->addr, args->len, args->prot, 427 args->flags, args->fd, args->pgoff); 428 #endif 429 430 linux_args.addr = (l_caddr_t)args->addr; 431 linux_args.len = args->len; 432 linux_args.prot = args->prot; 433 linux_args.flags = args->flags; 434 linux_args.fd = args->fd; 435 linux_args.pos = args->pgoff * PAGE_SIZE; 436 437 return (linux_mmap_common(td, &linux_args)); 438 } 439 440 int 441 linux_mmap(struct thread *td, struct linux_mmap_args *args) 442 { 443 int error; 444 struct l_mmap_argv linux_args; 445 446 error = copyin(args->ptr, &linux_args, sizeof(linux_args)); 447 if (error) 448 return (error); 449 450 #ifdef DEBUG 451 if (ldebug(mmap)) 452 printf(ARGS(mmap, "%p, %d, %d, 0x%08x, %d, %d"), 453 (void *)linux_args.addr, linux_args.len, linux_args.prot, 454 linux_args.flags, linux_args.fd, linux_args.pos); 455 #endif 456 457 return (linux_mmap_common(td, &linux_args)); 458 } 459 460 static int 461 linux_mmap_common(struct thread *td, struct l_mmap_argv *linux_args) 462 { 463 struct proc *p = td->td_proc; 464 struct mmap_args /* { 465 caddr_t addr; 466 size_t len; 467 int prot; 468 int flags; 469 int fd; 470 long pad; 471 off_t pos; 472 } */ bsd_args; 473 int error; 474 struct file *fp; 475 476 error = 0; 477 bsd_args.flags = 0; 478 fp = NULL; 479 480 /* 481 * Linux mmap(2): 482 * You must specify exactly one of MAP_SHARED and MAP_PRIVATE 483 */ 484 if (! ((linux_args->flags & LINUX_MAP_SHARED) ^ 485 (linux_args->flags & LINUX_MAP_PRIVATE))) 486 return (EINVAL); 487 488 if (linux_args->flags & LINUX_MAP_SHARED) 489 bsd_args.flags |= MAP_SHARED; 490 if (linux_args->flags & LINUX_MAP_PRIVATE) 491 bsd_args.flags |= MAP_PRIVATE; 492 if (linux_args->flags & LINUX_MAP_FIXED) 493 bsd_args.flags |= MAP_FIXED; 494 if (linux_args->flags & LINUX_MAP_ANON) 495 bsd_args.flags |= MAP_ANON; 496 else 497 bsd_args.flags |= MAP_NOSYNC; 498 if (linux_args->flags & LINUX_MAP_GROWSDOWN) { 499 bsd_args.flags |= MAP_STACK; 500 501 /* The linux MAP_GROWSDOWN option does not limit auto 502 * growth of the region. Linux mmap with this option 503 * takes as addr the inital BOS, and as len, the initial 504 * region size. It can then grow down from addr without 505 * limit. However, linux threads has an implicit internal 506 * limit to stack size of STACK_SIZE. Its just not 507 * enforced explicitly in linux. But, here we impose 508 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack 509 * region, since we can do this with our mmap. 510 * 511 * Our mmap with MAP_STACK takes addr as the maximum 512 * downsize limit on BOS, and as len the max size of 513 * the region. It them maps the top SGROWSIZ bytes, 514 * and autgrows the region down, up to the limit 515 * in addr. 516 * 517 * If we don't use the MAP_STACK option, the effect 518 * of this code is to allocate a stack region of a 519 * fixed size of (STACK_SIZE - GUARD_SIZE). 520 */ 521 522 /* This gives us TOS */ 523 bsd_args.addr = linux_args->addr + linux_args->len; 524 525 if (bsd_args.addr > p->p_vmspace->vm_maxsaddr) { 526 /* Some linux apps will attempt to mmap 527 * thread stacks near the top of their 528 * address space. If their TOS is greater 529 * than vm_maxsaddr, vm_map_growstack() 530 * will confuse the thread stack with the 531 * process stack and deliver a SEGV if they 532 * attempt to grow the thread stack past their 533 * current stacksize rlimit. To avoid this, 534 * adjust vm_maxsaddr upwards to reflect 535 * the current stacksize rlimit rather 536 * than the maximum possible stacksize. 537 * It would be better to adjust the 538 * mmap'ed region, but some apps do not check 539 * mmap's return value. 540 */ 541 PROC_LOCK(p); 542 p->p_vmspace->vm_maxsaddr = (char *)USRSTACK - 543 lim_cur(p, RLIMIT_STACK); 544 PROC_UNLOCK(p); 545 } 546 547 /* This gives us our maximum stack size */ 548 if (linux_args->len > STACK_SIZE - GUARD_SIZE) 549 bsd_args.len = linux_args->len; 550 else 551 bsd_args.len = STACK_SIZE - GUARD_SIZE; 552 553 /* This gives us a new BOS. If we're using VM_STACK, then 554 * mmap will just map the top SGROWSIZ bytes, and let 555 * the stack grow down to the limit at BOS. If we're 556 * not using VM_STACK we map the full stack, since we 557 * don't have a way to autogrow it. 558 */ 559 bsd_args.addr -= bsd_args.len; 560 } else { 561 bsd_args.addr = linux_args->addr; 562 bsd_args.len = linux_args->len; 563 } 564 565 bsd_args.prot = linux_args->prot; 566 if (linux_args->flags & LINUX_MAP_ANON) 567 bsd_args.fd = -1; 568 else { 569 /* 570 * Linux follows Solaris mmap(2) description: 571 * The file descriptor fildes is opened with 572 * read permission, regardless of the 573 * protection options specified. 574 * If PROT_WRITE is specified, the application 575 * must have opened the file descriptor 576 * fildes with write permission unless 577 * MAP_PRIVATE is specified in the flag 578 * argument as described below. 579 */ 580 581 if ((error = fget(td, linux_args->fd, &fp)) != 0) 582 return (error); 583 if (fp->f_type != DTYPE_VNODE) { 584 fdrop(fp, td); 585 return (EINVAL); 586 } 587 588 /* Linux mmap() just fails for O_WRONLY files */ 589 if (! (fp->f_flag & FREAD)) { 590 fdrop(fp, td); 591 return (EACCES); 592 } 593 594 bsd_args.fd = linux_args->fd; 595 fdrop(fp, td); 596 } 597 bsd_args.pos = linux_args->pos; 598 bsd_args.pad = 0; 599 600 #ifdef DEBUG 601 if (ldebug(mmap)) 602 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n", 603 __func__, 604 (void *)bsd_args.addr, bsd_args.len, bsd_args.prot, 605 bsd_args.flags, bsd_args.fd, (int)bsd_args.pos); 606 #endif 607 error = mmap(td, &bsd_args); 608 #ifdef DEBUG 609 if (ldebug(mmap)) 610 printf("-> %s() return: 0x%x (0x%08x)\n", 611 __func__, error, (u_int)td->td_retval[0]); 612 #endif 613 return (error); 614 } 615 616 int 617 linux_pipe(struct thread *td, struct linux_pipe_args *args) 618 { 619 int error; 620 int reg_edx; 621 622 #ifdef DEBUG 623 if (ldebug(pipe)) 624 printf(ARGS(pipe, "*")); 625 #endif 626 627 reg_edx = td->td_retval[1]; 628 error = pipe(td, 0); 629 if (error) { 630 td->td_retval[1] = reg_edx; 631 return (error); 632 } 633 634 error = copyout(td->td_retval, args->pipefds, 2*sizeof(int)); 635 if (error) { 636 td->td_retval[1] = reg_edx; 637 return (error); 638 } 639 640 td->td_retval[1] = reg_edx; 641 td->td_retval[0] = 0; 642 return (0); 643 } 644 645 int 646 linux_ioperm(struct thread *td, struct linux_ioperm_args *args) 647 { 648 int error; 649 struct i386_ioperm_args iia; 650 651 iia.start = args->start; 652 iia.length = args->length; 653 iia.enable = args->enable; 654 mtx_lock(&Giant); 655 error = i386_set_ioperm(td, &iia); 656 mtx_unlock(&Giant); 657 return (error); 658 } 659 660 int 661 linux_iopl(struct thread *td, struct linux_iopl_args *args) 662 { 663 int error; 664 665 if (args->level < 0 || args->level > 3) 666 return (EINVAL); 667 if ((error = suser(td)) != 0) 668 return (error); 669 if ((error = securelevel_gt(td->td_ucred, 0)) != 0) 670 return (error); 671 td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) | 672 (args->level * (PSL_IOPL / 3)); 673 return (0); 674 } 675 676 int 677 linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap) 678 { 679 int error; 680 struct i386_ldt_args ldt; 681 struct l_descriptor ld; 682 union descriptor desc; 683 684 if (uap->ptr == NULL) 685 return (EINVAL); 686 687 switch (uap->func) { 688 case 0x00: /* read_ldt */ 689 ldt.start = 0; 690 ldt.descs = uap->ptr; 691 ldt.num = uap->bytecount / sizeof(union descriptor); 692 mtx_lock(&Giant); 693 error = i386_get_ldt(td, &ldt); 694 td->td_retval[0] *= sizeof(union descriptor); 695 mtx_unlock(&Giant); 696 break; 697 case 0x01: /* write_ldt */ 698 case 0x11: /* write_ldt */ 699 if (uap->bytecount != sizeof(ld)) 700 return (EINVAL); 701 702 error = copyin(uap->ptr, &ld, sizeof(ld)); 703 if (error) 704 return (error); 705 706 ldt.start = ld.entry_number; 707 ldt.descs = &desc; 708 ldt.num = 1; 709 desc.sd.sd_lolimit = (ld.limit & 0x0000ffff); 710 desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; 711 desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff); 712 desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; 713 desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | 714 (ld.contents << 2); 715 desc.sd.sd_dpl = 3; 716 desc.sd.sd_p = (ld.seg_not_present ^ 1); 717 desc.sd.sd_xx = 0; 718 desc.sd.sd_def32 = ld.seg_32bit; 719 desc.sd.sd_gran = ld.limit_in_pages; 720 mtx_lock(&Giant); 721 error = i386_set_ldt(td, &ldt, &desc); 722 mtx_unlock(&Giant); 723 break; 724 default: 725 error = EINVAL; 726 break; 727 } 728 729 if (error == EOPNOTSUPP) { 730 printf("linux: modify_ldt needs kernel option USER_LDT\n"); 731 error = ENOSYS; 732 } 733 734 return (error); 735 } 736 737 int 738 linux_sigaction(struct thread *td, struct linux_sigaction_args *args) 739 { 740 l_osigaction_t osa; 741 l_sigaction_t act, oact; 742 int error; 743 744 #ifdef DEBUG 745 if (ldebug(sigaction)) 746 printf(ARGS(sigaction, "%d, %p, %p"), 747 args->sig, (void *)args->nsa, (void *)args->osa); 748 #endif 749 750 if (args->nsa != NULL) { 751 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t)); 752 if (error) 753 return (error); 754 act.lsa_handler = osa.lsa_handler; 755 act.lsa_flags = osa.lsa_flags; 756 act.lsa_restorer = osa.lsa_restorer; 757 LINUX_SIGEMPTYSET(act.lsa_mask); 758 act.lsa_mask.__bits[0] = osa.lsa_mask; 759 } 760 761 error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL, 762 args->osa ? &oact : NULL); 763 764 if (args->osa != NULL && !error) { 765 osa.lsa_handler = oact.lsa_handler; 766 osa.lsa_flags = oact.lsa_flags; 767 osa.lsa_restorer = oact.lsa_restorer; 768 osa.lsa_mask = oact.lsa_mask.__bits[0]; 769 error = copyout(&osa, args->osa, sizeof(l_osigaction_t)); 770 } 771 772 return (error); 773 } 774 775 /* 776 * Linux has two extra args, restart and oldmask. We dont use these, 777 * but it seems that "restart" is actually a context pointer that 778 * enables the signal to happen with a different register set. 779 */ 780 int 781 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args) 782 { 783 sigset_t sigmask; 784 l_sigset_t mask; 785 786 #ifdef DEBUG 787 if (ldebug(sigsuspend)) 788 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask); 789 #endif 790 791 LINUX_SIGEMPTYSET(mask); 792 mask.__bits[0] = args->mask; 793 linux_to_bsd_sigset(&mask, &sigmask); 794 return (kern_sigsuspend(td, sigmask)); 795 } 796 797 int 798 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) 799 { 800 l_sigset_t lmask; 801 sigset_t sigmask; 802 int error; 803 804 #ifdef DEBUG 805 if (ldebug(rt_sigsuspend)) 806 printf(ARGS(rt_sigsuspend, "%p, %d"), 807 (void *)uap->newset, uap->sigsetsize); 808 #endif 809 810 if (uap->sigsetsize != sizeof(l_sigset_t)) 811 return (EINVAL); 812 813 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); 814 if (error) 815 return (error); 816 817 linux_to_bsd_sigset(&lmask, &sigmask); 818 return (kern_sigsuspend(td, sigmask)); 819 } 820 821 int 822 linux_pause(struct thread *td, struct linux_pause_args *args) 823 { 824 struct proc *p = td->td_proc; 825 sigset_t sigmask; 826 827 #ifdef DEBUG 828 if (ldebug(pause)) 829 printf(ARGS(pause, "")); 830 #endif 831 832 PROC_LOCK(p); 833 sigmask = td->td_sigmask; 834 PROC_UNLOCK(p); 835 return (kern_sigsuspend(td, sigmask)); 836 } 837 838 int 839 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) 840 { 841 stack_t ss, oss; 842 l_stack_t lss; 843 int error; 844 845 #ifdef DEBUG 846 if (ldebug(sigaltstack)) 847 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss); 848 #endif 849 850 if (uap->uss != NULL) { 851 error = copyin(uap->uss, &lss, sizeof(l_stack_t)); 852 if (error) 853 return (error); 854 855 ss.ss_sp = lss.ss_sp; 856 ss.ss_size = lss.ss_size; 857 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); 858 } 859 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, 860 (uap->uoss != NULL) ? &oss : NULL); 861 if (!error && uap->uoss != NULL) { 862 lss.ss_sp = oss.ss_sp; 863 lss.ss_size = oss.ss_size; 864 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); 865 error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); 866 } 867 868 return (error); 869 } 870 871 int 872 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args) 873 { 874 struct ftruncate_args sa; 875 876 #ifdef DEBUG 877 if (ldebug(ftruncate64)) 878 printf(ARGS(ftruncate64, "%u, %jd"), args->fd, 879 (intmax_t)args->length); 880 #endif 881 882 sa.fd = args->fd; 883 sa.pad = 0; 884 sa.length = args->length; 885 return ftruncate(td, &sa); 886 } 887 888 int 889 linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) 890 { 891 /* 892 * Return an error code instead of raising a SIGSYS so that 893 * the caller will fall back to simpler LDT methods. 894 */ 895 return (ENOSYS); 896 } 897 898 int 899 linux_gettid(struct thread *td, struct linux_gettid_args *args) 900 { 901 902 td->td_retval[0] = td->td_proc->p_pid; 903 return (0); 904 } 905 906 int 907 linux_tkill(struct thread *td, struct linux_tkill_args *args) 908 { 909 910 return (linux_kill(td, (struct linux_kill_args *) args)); 911 } 912
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