1 /*-
2 * Copyright (c) 2004 Tim J. Robbins
3 * Copyright (c) 2002 Doug Rabson
4 * Copyright (c) 2000 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD: releng/8.2/sys/amd64/linux32/linux32_machdep.c 209304 2010-06-18 15:25:57Z kan $");
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/systm.h>
37 #include <sys/file.h>
38 #include <sys/fcntl.h>
39 #include <sys/clock.h>
40 #include <sys/imgact.h>
41 #include <sys/limits.h>
42 #include <sys/lock.h>
43 #include <sys/malloc.h>
44 #include <sys/mman.h>
45 #include <sys/mutex.h>
46 #include <sys/priv.h>
47 #include <sys/proc.h>
48 #include <sys/resource.h>
49 #include <sys/resourcevar.h>
50 #include <sys/sched.h>
51 #include <sys/syscallsubr.h>
52 #include <sys/sysproto.h>
53 #include <sys/unistd.h>
54
55 #include <machine/frame.h>
56 #include <machine/pcb.h>
57 #include <machine/psl.h>
58 #include <machine/segments.h>
59 #include <machine/specialreg.h>
60
61 #include <vm/vm.h>
62 #include <vm/pmap.h>
63 #include <vm/vm_extern.h>
64 #include <vm/vm_kern.h>
65 #include <vm/vm_map.h>
66
67 #include <amd64/linux32/linux.h>
68 #include <amd64/linux32/linux32_proto.h>
69 #include <compat/linux/linux_ipc.h>
70 #include <compat/linux/linux_signal.h>
71 #include <compat/linux/linux_util.h>
72 #include <compat/linux/linux_emul.h>
73
74 struct l_old_select_argv {
75 l_int nfds;
76 l_uintptr_t readfds;
77 l_uintptr_t writefds;
78 l_uintptr_t exceptfds;
79 l_uintptr_t timeout;
80 } __packed;
81
82 int
83 linux_to_bsd_sigaltstack(int lsa)
84 {
85 int bsa = 0;
86
87 if (lsa & LINUX_SS_DISABLE)
88 bsa |= SS_DISABLE;
89 if (lsa & LINUX_SS_ONSTACK)
90 bsa |= SS_ONSTACK;
91 return (bsa);
92 }
93
94 static int linux_mmap_common(struct thread *td, l_uintptr_t addr,
95 l_size_t len, l_int prot, l_int flags, l_int fd,
96 l_loff_t pos);
97
98 int
99 bsd_to_linux_sigaltstack(int bsa)
100 {
101 int lsa = 0;
102
103 if (bsa & SS_DISABLE)
104 lsa |= LINUX_SS_DISABLE;
105 if (bsa & SS_ONSTACK)
106 lsa |= LINUX_SS_ONSTACK;
107 return (lsa);
108 }
109
110 /*
111 * Custom version of exec_copyin_args() so that we can translate
112 * the pointers.
113 */
114 static int
115 linux_exec_copyin_args(struct image_args *args, char *fname,
116 enum uio_seg segflg, char **argv, char **envv)
117 {
118 char *argp, *envp;
119 u_int32_t *p32, arg;
120 size_t length;
121 int error;
122
123 bzero(args, sizeof(*args));
124 if (argv == NULL)
125 return (EFAULT);
126
127 /*
128 * Allocate temporary demand zeroed space for argument and
129 * environment strings
130 */
131 args->buf = (char *)kmem_alloc_wait(exec_map,
132 PATH_MAX + ARG_MAX + MAXSHELLCMDLEN);
133 if (args->buf == NULL)
134 return (ENOMEM);
135 args->begin_argv = args->buf;
136 args->endp = args->begin_argv;
137 args->stringspace = ARG_MAX;
138
139 args->fname = args->buf + ARG_MAX;
140
141 /*
142 * Copy the file name.
143 */
144 error = (segflg == UIO_SYSSPACE) ?
145 copystr(fname, args->fname, PATH_MAX, &length) :
146 copyinstr(fname, args->fname, PATH_MAX, &length);
147 if (error != 0)
148 goto err_exit;
149
150 /*
151 * extract arguments first
152 */
153 p32 = (u_int32_t *)argv;
154 for (;;) {
155 error = copyin(p32++, &arg, sizeof(arg));
156 if (error)
157 goto err_exit;
158 if (arg == 0)
159 break;
160 argp = PTRIN(arg);
161 error = copyinstr(argp, args->endp, args->stringspace, &length);
162 if (error) {
163 if (error == ENAMETOOLONG)
164 error = E2BIG;
165
166 goto err_exit;
167 }
168 args->stringspace -= length;
169 args->endp += length;
170 args->argc++;
171 }
172
173 args->begin_envv = args->endp;
174
175 /*
176 * extract environment strings
177 */
178 if (envv) {
179 p32 = (u_int32_t *)envv;
180 for (;;) {
181 error = copyin(p32++, &arg, sizeof(arg));
182 if (error)
183 goto err_exit;
184 if (arg == 0)
185 break;
186 envp = PTRIN(arg);
187 error = copyinstr(envp, args->endp, args->stringspace,
188 &length);
189 if (error) {
190 if (error == ENAMETOOLONG)
191 error = E2BIG;
192 goto err_exit;
193 }
194 args->stringspace -= length;
195 args->endp += length;
196 args->envc++;
197 }
198 }
199
200 return (0);
201
202 err_exit:
203 kmem_free_wakeup(exec_map, (vm_offset_t)args->buf,
204 PATH_MAX + ARG_MAX + MAXSHELLCMDLEN);
205 args->buf = NULL;
206 return (error);
207 }
208
209 int
210 linux_execve(struct thread *td, struct linux_execve_args *args)
211 {
212 struct image_args eargs;
213 char *path;
214 int error;
215
216 LCONVPATHEXIST(td, args->path, &path);
217
218 #ifdef DEBUG
219 if (ldebug(execve))
220 printf(ARGS(execve, "%s"), path);
221 #endif
222
223 error = linux_exec_copyin_args(&eargs, path, UIO_SYSSPACE, args->argp,
224 args->envp);
225 free(path, M_TEMP);
226 if (error == 0)
227 error = kern_execve(td, &eargs, NULL);
228 if (error == 0)
229 /* Linux process can execute FreeBSD one, do not attempt
230 * to create emuldata for such process using
231 * linux_proc_init, this leads to a panic on KASSERT
232 * because such process has p->p_emuldata == NULL.
233 */
234 if (td->td_proc->p_sysent == &elf_linux_sysvec)
235 error = linux_proc_init(td, 0, 0);
236 return (error);
237 }
238
239 CTASSERT(sizeof(struct l_iovec32) == 8);
240
241 static int
242 linux32_copyinuio(struct l_iovec32 *iovp, l_ulong iovcnt, struct uio **uiop)
243 {
244 struct l_iovec32 iov32;
245 struct iovec *iov;
246 struct uio *uio;
247 uint32_t iovlen;
248 int error, i;
249
250 *uiop = NULL;
251 if (iovcnt > UIO_MAXIOV)
252 return (EINVAL);
253 iovlen = iovcnt * sizeof(struct iovec);
254 uio = malloc(iovlen + sizeof(*uio), M_IOV, M_WAITOK);
255 iov = (struct iovec *)(uio + 1);
256 for (i = 0; i < iovcnt; i++) {
257 error = copyin(&iovp[i], &iov32, sizeof(struct l_iovec32));
258 if (error) {
259 free(uio, M_IOV);
260 return (error);
261 }
262 iov[i].iov_base = PTRIN(iov32.iov_base);
263 iov[i].iov_len = iov32.iov_len;
264 }
265 uio->uio_iov = iov;
266 uio->uio_iovcnt = iovcnt;
267 uio->uio_segflg = UIO_USERSPACE;
268 uio->uio_offset = -1;
269 uio->uio_resid = 0;
270 for (i = 0; i < iovcnt; i++) {
271 if (iov->iov_len > INT_MAX - uio->uio_resid) {
272 free(uio, M_IOV);
273 return (EINVAL);
274 }
275 uio->uio_resid += iov->iov_len;
276 iov++;
277 }
278 *uiop = uio;
279 return (0);
280 }
281
282 int
283 linux32_copyiniov(struct l_iovec32 *iovp32, l_ulong iovcnt, struct iovec **iovp,
284 int error)
285 {
286 struct l_iovec32 iov32;
287 struct iovec *iov;
288 uint32_t iovlen;
289 int i;
290
291 *iovp = NULL;
292 if (iovcnt > UIO_MAXIOV)
293 return (error);
294 iovlen = iovcnt * sizeof(struct iovec);
295 iov = malloc(iovlen, M_IOV, M_WAITOK);
296 for (i = 0; i < iovcnt; i++) {
297 error = copyin(&iovp32[i], &iov32, sizeof(struct l_iovec32));
298 if (error) {
299 free(iov, M_IOV);
300 return (error);
301 }
302 iov[i].iov_base = PTRIN(iov32.iov_base);
303 iov[i].iov_len = iov32.iov_len;
304 }
305 *iovp = iov;
306 return(0);
307
308 }
309
310 int
311 linux_readv(struct thread *td, struct linux_readv_args *uap)
312 {
313 struct uio *auio;
314 int error;
315
316 error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
317 if (error)
318 return (error);
319 error = kern_readv(td, uap->fd, auio);
320 free(auio, M_IOV);
321 return (error);
322 }
323
324 int
325 linux_writev(struct thread *td, struct linux_writev_args *uap)
326 {
327 struct uio *auio;
328 int error;
329
330 error = linux32_copyinuio(uap->iovp, uap->iovcnt, &auio);
331 if (error)
332 return (error);
333 error = kern_writev(td, uap->fd, auio);
334 free(auio, M_IOV);
335 return (error);
336 }
337
338 struct l_ipc_kludge {
339 l_uintptr_t msgp;
340 l_long msgtyp;
341 } __packed;
342
343 int
344 linux_ipc(struct thread *td, struct linux_ipc_args *args)
345 {
346
347 switch (args->what & 0xFFFF) {
348 case LINUX_SEMOP: {
349 struct linux_semop_args a;
350
351 a.semid = args->arg1;
352 a.tsops = args->ptr;
353 a.nsops = args->arg2;
354 return (linux_semop(td, &a));
355 }
356 case LINUX_SEMGET: {
357 struct linux_semget_args a;
358
359 a.key = args->arg1;
360 a.nsems = args->arg2;
361 a.semflg = args->arg3;
362 return (linux_semget(td, &a));
363 }
364 case LINUX_SEMCTL: {
365 struct linux_semctl_args a;
366 int error;
367
368 a.semid = args->arg1;
369 a.semnum = args->arg2;
370 a.cmd = args->arg3;
371 error = copyin(args->ptr, &a.arg, sizeof(a.arg));
372 if (error)
373 return (error);
374 return (linux_semctl(td, &a));
375 }
376 case LINUX_MSGSND: {
377 struct linux_msgsnd_args a;
378
379 a.msqid = args->arg1;
380 a.msgp = args->ptr;
381 a.msgsz = args->arg2;
382 a.msgflg = args->arg3;
383 return (linux_msgsnd(td, &a));
384 }
385 case LINUX_MSGRCV: {
386 struct linux_msgrcv_args a;
387
388 a.msqid = args->arg1;
389 a.msgsz = args->arg2;
390 a.msgflg = args->arg3;
391 if ((args->what >> 16) == 0) {
392 struct l_ipc_kludge tmp;
393 int error;
394
395 if (args->ptr == 0)
396 return (EINVAL);
397 error = copyin(args->ptr, &tmp, sizeof(tmp));
398 if (error)
399 return (error);
400 a.msgp = PTRIN(tmp.msgp);
401 a.msgtyp = tmp.msgtyp;
402 } else {
403 a.msgp = args->ptr;
404 a.msgtyp = args->arg5;
405 }
406 return (linux_msgrcv(td, &a));
407 }
408 case LINUX_MSGGET: {
409 struct linux_msgget_args a;
410
411 a.key = args->arg1;
412 a.msgflg = args->arg2;
413 return (linux_msgget(td, &a));
414 }
415 case LINUX_MSGCTL: {
416 struct linux_msgctl_args a;
417
418 a.msqid = args->arg1;
419 a.cmd = args->arg2;
420 a.buf = args->ptr;
421 return (linux_msgctl(td, &a));
422 }
423 case LINUX_SHMAT: {
424 struct linux_shmat_args a;
425
426 a.shmid = args->arg1;
427 a.shmaddr = args->ptr;
428 a.shmflg = args->arg2;
429 a.raddr = PTRIN((l_uint)args->arg3);
430 return (linux_shmat(td, &a));
431 }
432 case LINUX_SHMDT: {
433 struct linux_shmdt_args a;
434
435 a.shmaddr = args->ptr;
436 return (linux_shmdt(td, &a));
437 }
438 case LINUX_SHMGET: {
439 struct linux_shmget_args a;
440
441 a.key = args->arg1;
442 a.size = args->arg2;
443 a.shmflg = args->arg3;
444 return (linux_shmget(td, &a));
445 }
446 case LINUX_SHMCTL: {
447 struct linux_shmctl_args a;
448
449 a.shmid = args->arg1;
450 a.cmd = args->arg2;
451 a.buf = args->ptr;
452 return (linux_shmctl(td, &a));
453 }
454 default:
455 break;
456 }
457
458 return (EINVAL);
459 }
460
461 int
462 linux_old_select(struct thread *td, struct linux_old_select_args *args)
463 {
464 struct l_old_select_argv linux_args;
465 struct linux_select_args newsel;
466 int error;
467
468 #ifdef DEBUG
469 if (ldebug(old_select))
470 printf(ARGS(old_select, "%p"), args->ptr);
471 #endif
472
473 error = copyin(args->ptr, &linux_args, sizeof(linux_args));
474 if (error)
475 return (error);
476
477 newsel.nfds = linux_args.nfds;
478 newsel.readfds = PTRIN(linux_args.readfds);
479 newsel.writefds = PTRIN(linux_args.writefds);
480 newsel.exceptfds = PTRIN(linux_args.exceptfds);
481 newsel.timeout = PTRIN(linux_args.timeout);
482 return (linux_select(td, &newsel));
483 }
484
485 int
486 linux_fork(struct thread *td, struct linux_fork_args *args)
487 {
488 int error;
489 struct proc *p2;
490 struct thread *td2;
491
492 #ifdef DEBUG
493 if (ldebug(fork))
494 printf(ARGS(fork, ""));
495 #endif
496
497 if ((error = fork1(td, RFFDG | RFPROC | RFSTOPPED, 0, &p2)) != 0)
498 return (error);
499
500 if (error == 0) {
501 td->td_retval[0] = p2->p_pid;
502 td->td_retval[1] = 0;
503 }
504
505 if (td->td_retval[1] == 1)
506 td->td_retval[0] = 0;
507 error = linux_proc_init(td, td->td_retval[0], 0);
508 if (error)
509 return (error);
510
511 td2 = FIRST_THREAD_IN_PROC(p2);
512
513 /*
514 * Make this runnable after we are finished with it.
515 */
516 thread_lock(td2);
517 TD_SET_CAN_RUN(td2);
518 sched_add(td2, SRQ_BORING);
519 thread_unlock(td2);
520
521 return (0);
522 }
523
524 int
525 linux_vfork(struct thread *td, struct linux_vfork_args *args)
526 {
527 int error;
528 struct proc *p2;
529 struct thread *td2;
530
531 #ifdef DEBUG
532 if (ldebug(vfork))
533 printf(ARGS(vfork, ""));
534 #endif
535
536 /* Exclude RFPPWAIT */
537 if ((error = fork1(td, RFFDG | RFPROC | RFMEM | RFSTOPPED, 0, &p2)) != 0)
538 return (error);
539 if (error == 0) {
540 td->td_retval[0] = p2->p_pid;
541 td->td_retval[1] = 0;
542 }
543 /* Are we the child? */
544 if (td->td_retval[1] == 1)
545 td->td_retval[0] = 0;
546 error = linux_proc_init(td, td->td_retval[0], 0);
547 if (error)
548 return (error);
549
550 PROC_LOCK(p2);
551 p2->p_flag |= P_PPWAIT;
552 PROC_UNLOCK(p2);
553
554 td2 = FIRST_THREAD_IN_PROC(p2);
555
556 /*
557 * Make this runnable after we are finished with it.
558 */
559 thread_lock(td2);
560 TD_SET_CAN_RUN(td2);
561 sched_add(td2, SRQ_BORING);
562 thread_unlock(td2);
563
564 /* wait for the children to exit, ie. emulate vfork */
565 PROC_LOCK(p2);
566 while (p2->p_flag & P_PPWAIT)
567 cv_wait(&p2->p_pwait, &p2->p_mtx);
568 PROC_UNLOCK(p2);
569
570 return (0);
571 }
572
573 int
574 linux_clone(struct thread *td, struct linux_clone_args *args)
575 {
576 int error, ff = RFPROC | RFSTOPPED;
577 struct proc *p2;
578 struct thread *td2;
579 int exit_signal;
580 struct linux_emuldata *em;
581
582 #ifdef DEBUG
583 if (ldebug(clone)) {
584 printf(ARGS(clone, "flags %x, stack %p, parent tid: %p, "
585 "child tid: %p"), (unsigned)args->flags,
586 args->stack, args->parent_tidptr, args->child_tidptr);
587 }
588 #endif
589
590 exit_signal = args->flags & 0x000000ff;
591 if (LINUX_SIG_VALID(exit_signal)) {
592 if (exit_signal <= LINUX_SIGTBLSZ)
593 exit_signal =
594 linux_to_bsd_signal[_SIG_IDX(exit_signal)];
595 } else if (exit_signal != 0)
596 return (EINVAL);
597
598 if (args->flags & LINUX_CLONE_VM)
599 ff |= RFMEM;
600 if (args->flags & LINUX_CLONE_SIGHAND)
601 ff |= RFSIGSHARE;
602 /*
603 * XXX: In Linux, sharing of fs info (chroot/cwd/umask)
604 * and open files is independant. In FreeBSD, its in one
605 * structure but in reality it does not cause any problems
606 * because both of these flags are usually set together.
607 */
608 if (!(args->flags & (LINUX_CLONE_FILES | LINUX_CLONE_FS)))
609 ff |= RFFDG;
610
611 /*
612 * Attempt to detect when linux_clone(2) is used for creating
613 * kernel threads. Unfortunately despite the existence of the
614 * CLONE_THREAD flag, version of linuxthreads package used in
615 * most popular distros as of beginning of 2005 doesn't make
616 * any use of it. Therefore, this detection relies on
617 * empirical observation that linuxthreads sets certain
618 * combination of flags, so that we can make more or less
619 * precise detection and notify the FreeBSD kernel that several
620 * processes are in fact part of the same threading group, so
621 * that special treatment is necessary for signal delivery
622 * between those processes and fd locking.
623 */
624 if ((args->flags & 0xffffff00) == LINUX_THREADING_FLAGS)
625 ff |= RFTHREAD;
626
627 if (args->flags & LINUX_CLONE_PARENT_SETTID)
628 if (args->parent_tidptr == NULL)
629 return (EINVAL);
630
631 error = fork1(td, ff, 0, &p2);
632 if (error)
633 return (error);
634
635 if (args->flags & (LINUX_CLONE_PARENT | LINUX_CLONE_THREAD)) {
636 sx_xlock(&proctree_lock);
637 PROC_LOCK(p2);
638 proc_reparent(p2, td->td_proc->p_pptr);
639 PROC_UNLOCK(p2);
640 sx_xunlock(&proctree_lock);
641 }
642
643 /* create the emuldata */
644 error = linux_proc_init(td, p2->p_pid, args->flags);
645 /* reference it - no need to check this */
646 em = em_find(p2, EMUL_DOLOCK);
647 KASSERT(em != NULL, ("clone: emuldata not found.\n"));
648 /* and adjust it */
649
650 if (args->flags & LINUX_CLONE_THREAD) {
651 #ifdef notyet
652 PROC_LOCK(p2);
653 p2->p_pgrp = td->td_proc->p_pgrp;
654 PROC_UNLOCK(p2);
655 #endif
656 exit_signal = 0;
657 }
658
659 if (args->flags & LINUX_CLONE_CHILD_SETTID)
660 em->child_set_tid = args->child_tidptr;
661 else
662 em->child_set_tid = NULL;
663
664 if (args->flags & LINUX_CLONE_CHILD_CLEARTID)
665 em->child_clear_tid = args->child_tidptr;
666 else
667 em->child_clear_tid = NULL;
668
669 EMUL_UNLOCK(&emul_lock);
670
671 if (args->flags & LINUX_CLONE_PARENT_SETTID) {
672 error = copyout(&p2->p_pid, args->parent_tidptr,
673 sizeof(p2->p_pid));
674 if (error)
675 printf(LMSG("copyout failed!"));
676 }
677
678 PROC_LOCK(p2);
679 p2->p_sigparent = exit_signal;
680 PROC_UNLOCK(p2);
681 td2 = FIRST_THREAD_IN_PROC(p2);
682 /*
683 * In a case of stack = NULL, we are supposed to COW calling process
684 * stack. This is what normal fork() does, so we just keep tf_rsp arg
685 * intact.
686 */
687 if (args->stack)
688 td2->td_frame->tf_rsp = PTROUT(args->stack);
689
690 if (args->flags & LINUX_CLONE_SETTLS) {
691 struct user_segment_descriptor sd;
692 struct l_user_desc info;
693 int a[2];
694
695 error = copyin((void *)td->td_frame->tf_rsi, &info,
696 sizeof(struct l_user_desc));
697 if (error) {
698 printf(LMSG("copyin failed!"));
699 } else {
700 /* We might copy out the entry_number as GUGS32_SEL. */
701 info.entry_number = GUGS32_SEL;
702 error = copyout(&info, (void *)td->td_frame->tf_rsi,
703 sizeof(struct l_user_desc));
704 if (error)
705 printf(LMSG("copyout failed!"));
706
707 a[0] = LINUX_LDT_entry_a(&info);
708 a[1] = LINUX_LDT_entry_b(&info);
709
710 memcpy(&sd, &a, sizeof(a));
711 #ifdef DEBUG
712 if (ldebug(clone))
713 printf("Segment created in clone with "
714 "CLONE_SETTLS: lobase: %x, hibase: %x, "
715 "lolimit: %x, hilimit: %x, type: %i, "
716 "dpl: %i, p: %i, xx: %i, long: %i, "
717 "def32: %i, gran: %i\n", sd.sd_lobase,
718 sd.sd_hibase, sd.sd_lolimit, sd.sd_hilimit,
719 sd.sd_type, sd.sd_dpl, sd.sd_p, sd.sd_xx,
720 sd.sd_long, sd.sd_def32, sd.sd_gran);
721 #endif
722 td2->td_pcb->pcb_gsbase = (register_t)info.base_addr;
723 /* XXXKIB td2->td_pcb->pcb_gs32sd = sd; */
724 td2->td_frame->tf_gs = GSEL(GUGS32_SEL, SEL_UPL);
725 td2->td_pcb->pcb_flags |= PCB_GS32BIT | PCB_32BIT;
726 }
727 }
728
729 #ifdef DEBUG
730 if (ldebug(clone))
731 printf(LMSG("clone: successful rfork to %d, "
732 "stack %p sig = %d"), (int)p2->p_pid, args->stack,
733 exit_signal);
734 #endif
735 if (args->flags & LINUX_CLONE_VFORK) {
736 PROC_LOCK(p2);
737 p2->p_flag |= P_PPWAIT;
738 PROC_UNLOCK(p2);
739 }
740
741 /*
742 * Make this runnable after we are finished with it.
743 */
744 thread_lock(td2);
745 TD_SET_CAN_RUN(td2);
746 sched_add(td2, SRQ_BORING);
747 thread_unlock(td2);
748
749 td->td_retval[0] = p2->p_pid;
750 td->td_retval[1] = 0;
751
752 if (args->flags & LINUX_CLONE_VFORK) {
753 /* wait for the children to exit, ie. emulate vfork */
754 PROC_LOCK(p2);
755 while (p2->p_flag & P_PPWAIT)
756 cv_wait(&p2->p_pwait, &p2->p_mtx);
757 PROC_UNLOCK(p2);
758 }
759
760 return (0);
761 }
762
763 #define STACK_SIZE (2 * 1024 * 1024)
764 #define GUARD_SIZE (4 * PAGE_SIZE)
765
766 int
767 linux_mmap2(struct thread *td, struct linux_mmap2_args *args)
768 {
769
770 #ifdef DEBUG
771 if (ldebug(mmap2))
772 printf(ARGS(mmap2, "0x%08x, %d, %d, 0x%08x, %d, %d"),
773 args->addr, args->len, args->prot,
774 args->flags, args->fd, args->pgoff);
775 #endif
776
777 return (linux_mmap_common(td, PTROUT(args->addr), args->len, args->prot,
778 args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff *
779 PAGE_SIZE));
780 }
781
782 int
783 linux_mmap(struct thread *td, struct linux_mmap_args *args)
784 {
785 int error;
786 struct l_mmap_argv linux_args;
787
788 error = copyin(args->ptr, &linux_args, sizeof(linux_args));
789 if (error)
790 return (error);
791
792 #ifdef DEBUG
793 if (ldebug(mmap))
794 printf(ARGS(mmap, "0x%08x, %d, %d, 0x%08x, %d, %d"),
795 linux_args.addr, linux_args.len, linux_args.prot,
796 linux_args.flags, linux_args.fd, linux_args.pgoff);
797 #endif
798
799 return (linux_mmap_common(td, linux_args.addr, linux_args.len,
800 linux_args.prot, linux_args.flags, linux_args.fd,
801 (uint32_t)linux_args.pgoff));
802 }
803
804 static int
805 linux_mmap_common(struct thread *td, l_uintptr_t addr, l_size_t len, l_int prot,
806 l_int flags, l_int fd, l_loff_t pos)
807 {
808 struct proc *p = td->td_proc;
809 struct mmap_args /* {
810 caddr_t addr;
811 size_t len;
812 int prot;
813 int flags;
814 int fd;
815 long pad;
816 off_t pos;
817 } */ bsd_args;
818 int error;
819 struct file *fp;
820
821 error = 0;
822 bsd_args.flags = 0;
823 fp = NULL;
824
825 /*
826 * Linux mmap(2):
827 * You must specify exactly one of MAP_SHARED and MAP_PRIVATE
828 */
829 if (!((flags & LINUX_MAP_SHARED) ^ (flags & LINUX_MAP_PRIVATE)))
830 return (EINVAL);
831
832 if (flags & LINUX_MAP_SHARED)
833 bsd_args.flags |= MAP_SHARED;
834 if (flags & LINUX_MAP_PRIVATE)
835 bsd_args.flags |= MAP_PRIVATE;
836 if (flags & LINUX_MAP_FIXED)
837 bsd_args.flags |= MAP_FIXED;
838 if (flags & LINUX_MAP_ANON) {
839 /* Enforce pos to be on page boundary, then ignore. */
840 if ((pos & PAGE_MASK) != 0)
841 return (EINVAL);
842 pos = 0;
843 bsd_args.flags |= MAP_ANON;
844 } else
845 bsd_args.flags |= MAP_NOSYNC;
846 if (flags & LINUX_MAP_GROWSDOWN)
847 bsd_args.flags |= MAP_STACK;
848
849 /*
850 * PROT_READ, PROT_WRITE, or PROT_EXEC implies PROT_READ and PROT_EXEC
851 * on Linux/i386. We do this to ensure maximum compatibility.
852 * Linux/ia64 does the same in i386 emulation mode.
853 */
854 bsd_args.prot = prot;
855 if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
856 bsd_args.prot |= PROT_READ | PROT_EXEC;
857
858 /* Linux does not check file descriptor when MAP_ANONYMOUS is set. */
859 bsd_args.fd = (bsd_args.flags & MAP_ANON) ? -1 : fd;
860 if (bsd_args.fd != -1) {
861 /*
862 * Linux follows Solaris mmap(2) description:
863 * The file descriptor fildes is opened with
864 * read permission, regardless of the
865 * protection options specified.
866 */
867
868 if ((error = fget(td, bsd_args.fd, &fp)) != 0)
869 return (error);
870 if (fp->f_type != DTYPE_VNODE) {
871 fdrop(fp, td);
872 return (EINVAL);
873 }
874
875 /* Linux mmap() just fails for O_WRONLY files */
876 if (!(fp->f_flag & FREAD)) {
877 fdrop(fp, td);
878 return (EACCES);
879 }
880
881 fdrop(fp, td);
882 }
883
884 if (flags & LINUX_MAP_GROWSDOWN) {
885 /*
886 * The Linux MAP_GROWSDOWN option does not limit auto
887 * growth of the region. Linux mmap with this option
888 * takes as addr the inital BOS, and as len, the initial
889 * region size. It can then grow down from addr without
890 * limit. However, Linux threads has an implicit internal
891 * limit to stack size of STACK_SIZE. Its just not
892 * enforced explicitly in Linux. But, here we impose
893 * a limit of (STACK_SIZE - GUARD_SIZE) on the stack
894 * region, since we can do this with our mmap.
895 *
896 * Our mmap with MAP_STACK takes addr as the maximum
897 * downsize limit on BOS, and as len the max size of
898 * the region. It then maps the top SGROWSIZ bytes,
899 * and auto grows the region down, up to the limit
900 * in addr.
901 *
902 * If we don't use the MAP_STACK option, the effect
903 * of this code is to allocate a stack region of a
904 * fixed size of (STACK_SIZE - GUARD_SIZE).
905 */
906
907 if ((caddr_t)PTRIN(addr) + len > p->p_vmspace->vm_maxsaddr) {
908 /*
909 * Some Linux apps will attempt to mmap
910 * thread stacks near the top of their
911 * address space. If their TOS is greater
912 * than vm_maxsaddr, vm_map_growstack()
913 * will confuse the thread stack with the
914 * process stack and deliver a SEGV if they
915 * attempt to grow the thread stack past their
916 * current stacksize rlimit. To avoid this,
917 * adjust vm_maxsaddr upwards to reflect
918 * the current stacksize rlimit rather
919 * than the maximum possible stacksize.
920 * It would be better to adjust the
921 * mmap'ed region, but some apps do not check
922 * mmap's return value.
923 */
924 PROC_LOCK(p);
925 p->p_vmspace->vm_maxsaddr = (char *)LINUX32_USRSTACK -
926 lim_cur(p, RLIMIT_STACK);
927 PROC_UNLOCK(p);
928 }
929
930 /*
931 * This gives us our maximum stack size and a new BOS.
932 * If we're using VM_STACK, then mmap will just map
933 * the top SGROWSIZ bytes, and let the stack grow down
934 * to the limit at BOS. If we're not using VM_STACK
935 * we map the full stack, since we don't have a way
936 * to autogrow it.
937 */
938 if (len > STACK_SIZE - GUARD_SIZE) {
939 bsd_args.addr = (caddr_t)PTRIN(addr);
940 bsd_args.len = len;
941 } else {
942 bsd_args.addr = (caddr_t)PTRIN(addr) -
943 (STACK_SIZE - GUARD_SIZE - len);
944 bsd_args.len = STACK_SIZE - GUARD_SIZE;
945 }
946 } else {
947 bsd_args.addr = (caddr_t)PTRIN(addr);
948 bsd_args.len = len;
949 }
950 bsd_args.pos = pos;
951
952 #ifdef DEBUG
953 if (ldebug(mmap))
954 printf("-> %s(%p, %d, %d, 0x%08x, %d, 0x%x)\n",
955 __func__,
956 (void *)bsd_args.addr, (int)bsd_args.len, bsd_args.prot,
957 bsd_args.flags, bsd_args.fd, (int)bsd_args.pos);
958 #endif
959 error = mmap(td, &bsd_args);
960 #ifdef DEBUG
961 if (ldebug(mmap))
962 printf("-> %s() return: 0x%x (0x%08x)\n",
963 __func__, error, (u_int)td->td_retval[0]);
964 #endif
965 return (error);
966 }
967
968 int
969 linux_mprotect(struct thread *td, struct linux_mprotect_args *uap)
970 {
971 struct mprotect_args bsd_args;
972
973 bsd_args.addr = uap->addr;
974 bsd_args.len = uap->len;
975 bsd_args.prot = uap->prot;
976 if (bsd_args.prot & (PROT_READ | PROT_WRITE | PROT_EXEC))
977 bsd_args.prot |= PROT_READ | PROT_EXEC;
978 return (mprotect(td, &bsd_args));
979 }
980
981 int
982 linux_iopl(struct thread *td, struct linux_iopl_args *args)
983 {
984 int error;
985
986 if (args->level < 0 || args->level > 3)
987 return (EINVAL);
988 if ((error = priv_check(td, PRIV_IO)) != 0)
989 return (error);
990 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
991 return (error);
992 td->td_frame->tf_rflags = (td->td_frame->tf_rflags & ~PSL_IOPL) |
993 (args->level * (PSL_IOPL / 3));
994
995 return (0);
996 }
997
998 int
999 linux_pipe(struct thread *td, struct linux_pipe_args *args)
1000 {
1001 int error;
1002 int fildes[2];
1003
1004 #ifdef DEBUG
1005 if (ldebug(pipe))
1006 printf(ARGS(pipe, "*"));
1007 #endif
1008
1009 error = kern_pipe(td, fildes);
1010 if (error)
1011 return (error);
1012
1013 /* XXX: Close descriptors on error. */
1014 return (copyout(fildes, args->pipefds, sizeof fildes));
1015 }
1016
1017 int
1018 linux_sigaction(struct thread *td, struct linux_sigaction_args *args)
1019 {
1020 l_osigaction_t osa;
1021 l_sigaction_t act, oact;
1022 int error;
1023
1024 #ifdef DEBUG
1025 if (ldebug(sigaction))
1026 printf(ARGS(sigaction, "%d, %p, %p"),
1027 args->sig, (void *)args->nsa, (void *)args->osa);
1028 #endif
1029
1030 if (args->nsa != NULL) {
1031 error = copyin(args->nsa, &osa, sizeof(l_osigaction_t));
1032 if (error)
1033 return (error);
1034 act.lsa_handler = osa.lsa_handler;
1035 act.lsa_flags = osa.lsa_flags;
1036 act.lsa_restorer = osa.lsa_restorer;
1037 LINUX_SIGEMPTYSET(act.lsa_mask);
1038 act.lsa_mask.__bits[0] = osa.lsa_mask;
1039 }
1040
1041 error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL,
1042 args->osa ? &oact : NULL);
1043
1044 if (args->osa != NULL && !error) {
1045 osa.lsa_handler = oact.lsa_handler;
1046 osa.lsa_flags = oact.lsa_flags;
1047 osa.lsa_restorer = oact.lsa_restorer;
1048 osa.lsa_mask = oact.lsa_mask.__bits[0];
1049 error = copyout(&osa, args->osa, sizeof(l_osigaction_t));
1050 }
1051
1052 return (error);
1053 }
1054
1055 /*
1056 * Linux has two extra args, restart and oldmask. We don't use these,
1057 * but it seems that "restart" is actually a context pointer that
1058 * enables the signal to happen with a different register set.
1059 */
1060 int
1061 linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args)
1062 {
1063 sigset_t sigmask;
1064 l_sigset_t mask;
1065
1066 #ifdef DEBUG
1067 if (ldebug(sigsuspend))
1068 printf(ARGS(sigsuspend, "%08lx"), (unsigned long)args->mask);
1069 #endif
1070
1071 LINUX_SIGEMPTYSET(mask);
1072 mask.__bits[0] = args->mask;
1073 linux_to_bsd_sigset(&mask, &sigmask);
1074 return (kern_sigsuspend(td, sigmask));
1075 }
1076
1077 int
1078 linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap)
1079 {
1080 l_sigset_t lmask;
1081 sigset_t sigmask;
1082 int error;
1083
1084 #ifdef DEBUG
1085 if (ldebug(rt_sigsuspend))
1086 printf(ARGS(rt_sigsuspend, "%p, %d"),
1087 (void *)uap->newset, uap->sigsetsize);
1088 #endif
1089
1090 if (uap->sigsetsize != sizeof(l_sigset_t))
1091 return (EINVAL);
1092
1093 error = copyin(uap->newset, &lmask, sizeof(l_sigset_t));
1094 if (error)
1095 return (error);
1096
1097 linux_to_bsd_sigset(&lmask, &sigmask);
1098 return (kern_sigsuspend(td, sigmask));
1099 }
1100
1101 int
1102 linux_pause(struct thread *td, struct linux_pause_args *args)
1103 {
1104 struct proc *p = td->td_proc;
1105 sigset_t sigmask;
1106
1107 #ifdef DEBUG
1108 if (ldebug(pause))
1109 printf(ARGS(pause, ""));
1110 #endif
1111
1112 PROC_LOCK(p);
1113 sigmask = td->td_sigmask;
1114 PROC_UNLOCK(p);
1115 return (kern_sigsuspend(td, sigmask));
1116 }
1117
1118 int
1119 linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap)
1120 {
1121 stack_t ss, oss;
1122 l_stack_t lss;
1123 int error;
1124
1125 #ifdef DEBUG
1126 if (ldebug(sigaltstack))
1127 printf(ARGS(sigaltstack, "%p, %p"), uap->uss, uap->uoss);
1128 #endif
1129
1130 if (uap->uss != NULL) {
1131 error = copyin(uap->uss, &lss, sizeof(l_stack_t));
1132 if (error)
1133 return (error);
1134
1135 ss.ss_sp = PTRIN(lss.ss_sp);
1136 ss.ss_size = lss.ss_size;
1137 ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags);
1138 }
1139 error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL,
1140 (uap->uoss != NULL) ? &oss : NULL);
1141 if (!error && uap->uoss != NULL) {
1142 lss.ss_sp = PTROUT(oss.ss_sp);
1143 lss.ss_size = oss.ss_size;
1144 lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags);
1145 error = copyout(&lss, uap->uoss, sizeof(l_stack_t));
1146 }
1147
1148 return (error);
1149 }
1150
1151 int
1152 linux_ftruncate64(struct thread *td, struct linux_ftruncate64_args *args)
1153 {
1154 struct ftruncate_args sa;
1155
1156 #ifdef DEBUG
1157 if (ldebug(ftruncate64))
1158 printf(ARGS(ftruncate64, "%u, %jd"), args->fd,
1159 (intmax_t)args->length);
1160 #endif
1161
1162 sa.fd = args->fd;
1163 sa.length = args->length;
1164 return ftruncate(td, &sa);
1165 }
1166
1167 int
1168 linux_gettimeofday(struct thread *td, struct linux_gettimeofday_args *uap)
1169 {
1170 struct timeval atv;
1171 l_timeval atv32;
1172 struct timezone rtz;
1173 int error = 0;
1174
1175 if (uap->tp) {
1176 microtime(&atv);
1177 atv32.tv_sec = atv.tv_sec;
1178 atv32.tv_usec = atv.tv_usec;
1179 error = copyout(&atv32, uap->tp, sizeof(atv32));
1180 }
1181 if (error == 0 && uap->tzp != NULL) {
1182 rtz.tz_minuteswest = tz_minuteswest;
1183 rtz.tz_dsttime = tz_dsttime;
1184 error = copyout(&rtz, uap->tzp, sizeof(rtz));
1185 }
1186 return (error);
1187 }
1188
1189 int
1190 linux_settimeofday(struct thread *td, struct linux_settimeofday_args *uap)
1191 {
1192 l_timeval atv32;
1193 struct timeval atv, *tvp;
1194 struct timezone atz, *tzp;
1195 int error;
1196
1197 if (uap->tp) {
1198 error = copyin(uap->tp, &atv32, sizeof(atv32));
1199 if (error)
1200 return (error);
1201 atv.tv_sec = atv32.tv_sec;
1202 atv.tv_usec = atv32.tv_usec;
1203 tvp = &atv;
1204 } else
1205 tvp = NULL;
1206 if (uap->tzp) {
1207 error = copyin(uap->tzp, &atz, sizeof(atz));
1208 if (error)
1209 return (error);
1210 tzp = &atz;
1211 } else
1212 tzp = NULL;
1213 return (kern_settimeofday(td, tvp, tzp));
1214 }
1215
1216 int
1217 linux_getrusage(struct thread *td, struct linux_getrusage_args *uap)
1218 {
1219 struct l_rusage s32;
1220 struct rusage s;
1221 int error;
1222
1223 error = kern_getrusage(td, uap->who, &s);
1224 if (error != 0)
1225 return (error);
1226 if (uap->rusage != NULL) {
1227 s32.ru_utime.tv_sec = s.ru_utime.tv_sec;
1228 s32.ru_utime.tv_usec = s.ru_utime.tv_usec;
1229 s32.ru_stime.tv_sec = s.ru_stime.tv_sec;
1230 s32.ru_stime.tv_usec = s.ru_stime.tv_usec;
1231 s32.ru_maxrss = s.ru_maxrss;
1232 s32.ru_ixrss = s.ru_ixrss;
1233 s32.ru_idrss = s.ru_idrss;
1234 s32.ru_isrss = s.ru_isrss;
1235 s32.ru_minflt = s.ru_minflt;
1236 s32.ru_majflt = s.ru_majflt;
1237 s32.ru_nswap = s.ru_nswap;
1238 s32.ru_inblock = s.ru_inblock;
1239 s32.ru_oublock = s.ru_oublock;
1240 s32.ru_msgsnd = s.ru_msgsnd;
1241 s32.ru_msgrcv = s.ru_msgrcv;
1242 s32.ru_nsignals = s.ru_nsignals;
1243 s32.ru_nvcsw = s.ru_nvcsw;
1244 s32.ru_nivcsw = s.ru_nivcsw;
1245 error = copyout(&s32, uap->rusage, sizeof(s32));
1246 }
1247 return (error);
1248 }
1249
1250 int
1251 linux_sched_rr_get_interval(struct thread *td,
1252 struct linux_sched_rr_get_interval_args *uap)
1253 {
1254 struct timespec ts;
1255 struct l_timespec ts32;
1256 int error;
1257
1258 error = kern_sched_rr_get_interval(td, uap->pid, &ts);
1259 if (error != 0)
1260 return (error);
1261 ts32.tv_sec = ts.tv_sec;
1262 ts32.tv_nsec = ts.tv_nsec;
1263 return (copyout(&ts32, uap->interval, sizeof(ts32)));
1264 }
1265
1266 int
1267 linux_set_thread_area(struct thread *td,
1268 struct linux_set_thread_area_args *args)
1269 {
1270 struct l_user_desc info;
1271 struct user_segment_descriptor sd;
1272 int a[2];
1273 int error;
1274
1275 error = copyin(args->desc, &info, sizeof(struct l_user_desc));
1276 if (error)
1277 return (error);
1278
1279 #ifdef DEBUG
1280 if (ldebug(set_thread_area))
1281 printf(ARGS(set_thread_area, "%i, %x, %x, %i, %i, %i, "
1282 "%i, %i, %i"), info.entry_number, info.base_addr,
1283 info.limit, info.seg_32bit, info.contents,
1284 info.read_exec_only, info.limit_in_pages,
1285 info.seg_not_present, info.useable);
1286 #endif
1287
1288 /*
1289 * Semantics of Linux version: every thread in the system has array
1290 * of three TLS descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown.
1291 * This syscall loads one of the selected TLS decriptors with a value
1292 * and also loads GDT descriptors 6, 7 and 8 with the content of
1293 * the per-thread descriptors.
1294 *
1295 * Semantics of FreeBSD version: I think we can ignore that Linux has
1296 * three per-thread descriptors and use just the first one.
1297 * The tls_array[] is used only in [gs]et_thread_area() syscalls and
1298 * for loading the GDT descriptors. We use just one GDT descriptor
1299 * for TLS, so we will load just one.
1300 *
1301 * XXX: This doesn't work when a user space process tries to use more
1302 * than one TLS segment. Comment in the Linux source says wine might
1303 * do this.
1304 */
1305
1306 /*
1307 * GLIBC reads current %gs and call set_thread_area() with it.
1308 * We should let GUDATA_SEL and GUGS32_SEL proceed as well because
1309 * we use these segments.
1310 */
1311 switch (info.entry_number) {
1312 case GUGS32_SEL:
1313 case GUDATA_SEL:
1314 case 6:
1315 case -1:
1316 info.entry_number = GUGS32_SEL;
1317 break;
1318 default:
1319 return (EINVAL);
1320 }
1321
1322 /*
1323 * We have to copy out the GDT entry we use.
1324 *
1325 * XXX: What if a user space program does not check the return value
1326 * and tries to use 6, 7 or 8?
1327 */
1328 error = copyout(&info, args->desc, sizeof(struct l_user_desc));
1329 if (error)
1330 return (error);
1331
1332 if (LINUX_LDT_empty(&info)) {
1333 a[0] = 0;
1334 a[1] = 0;
1335 } else {
1336 a[0] = LINUX_LDT_entry_a(&info);
1337 a[1] = LINUX_LDT_entry_b(&info);
1338 }
1339
1340 memcpy(&sd, &a, sizeof(a));
1341 #ifdef DEBUG
1342 if (ldebug(set_thread_area))
1343 printf("Segment created in set_thread_area: "
1344 "lobase: %x, hibase: %x, lolimit: %x, hilimit: %x, "
1345 "type: %i, dpl: %i, p: %i, xx: %i, long: %i, "
1346 "def32: %i, gran: %i\n",
1347 sd.sd_lobase,
1348 sd.sd_hibase,
1349 sd.sd_lolimit,
1350 sd.sd_hilimit,
1351 sd.sd_type,
1352 sd.sd_dpl,
1353 sd.sd_p,
1354 sd.sd_xx,
1355 sd.sd_long,
1356 sd.sd_def32,
1357 sd.sd_gran);
1358 #endif
1359
1360 td->td_pcb->pcb_gsbase = (register_t)info.base_addr;
1361 td->td_pcb->pcb_flags |= PCB_32BIT | PCB_GS32BIT;
1362 update_gdt_gsbase(td, info.base_addr);
1363
1364 return (0);
1365 }
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