linux_util.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1994 Christos Zoulas
    5  * Copyright (c) 1995 Frank van der Linden
    6  * Copyright (c) 1995 Scott Bartram
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  *      from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/param.h>
   38 #include <sys/bus.h>
   39 #include <sys/conf.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/jail.h>
   42 #include <sys/lock.h>
   43 #include <sys/malloc.h>
   44 #include <sys/kernel.h>
   45 #include <sys/linker_set.h>
   46 #include <sys/mutex.h>
   47 #include <sys/namei.h>
   48 #include <sys/proc.h>
   49 #include <sys/sdt.h>
   50 #include <sys/syscallsubr.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/systm.h>
   53 #include <sys/vnode.h>
   54 
   55 #include <machine/stdarg.h>
   56 
   57 #include <compat/linux/linux_dtrace.h>
   58 #include <compat/linux/linux_mib.h>
   59 #include <compat/linux/linux_util.h>
   60 
   61 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
   62 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
   63 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes");
   64 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc");
   65 
   66 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
   67 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
   68 
   69 /**
   70  * Special DTrace provider for the linuxulator.
   71  *
   72  * In this file we define the provider for the entire linuxulator. All
   73  * modules (= files of the linuxulator) use it.
   74  *
   75  * We define a different name depending on the emulated bitsize, see
   76  * ../../<ARCH>/linux{,32}/linux.h, e.g.:
   77  *      native bitsize          = linuxulator
   78  *      amd64, 32bit emulation  = linuxulator32
   79  */
   80 LIN_SDT_PROVIDER_DEFINE(linuxulator);
   81 LIN_SDT_PROVIDER_DEFINE(linuxulator32);
   82 
   83 char linux_emul_path[MAXPATHLEN] = "/compat/linux";
   84 
   85 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
   86     linux_emul_path, sizeof(linux_emul_path),
   87     "Linux runtime environment path");
   88 
   89 /*
   90  * Search an alternate path before passing pathname arguments on to
   91  * system calls. Useful for keeping a separate 'emulation tree'.
   92  *
   93  * If cflag is set, we check if an attempt can be made to create the
   94  * named file, i.e. we check if the directory it should be in exists.
   95  */
   96 int
   97 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
   98     char **pbuf, int cflag, int dfd)
   99 {
  100         int retval;
  101 
  102         retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
  103             cflag, dfd);
  104 
  105         return (retval);
  106 }
  107 
  108 void
  109 linux_msg(const struct thread *td, const char *fmt, ...)
  110 {
  111         va_list ap;
  112         struct proc *p;
  113 
  114         if (linux_debug == 0)
  115                 return;
  116 
  117         p = td->td_proc;
  118         printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id,
  119             (int)p->p_pid, p->p_comm);
  120         va_start(ap, fmt);
  121         vprintf(fmt, ap);
  122         va_end(ap);
  123         printf("\n");
  124 }
  125 
  126 struct device_element
  127 {
  128         TAILQ_ENTRY(device_element) list;
  129         struct linux_device_handler entry;
  130 };
  131 
  132 static TAILQ_HEAD(, device_element) devices =
  133         TAILQ_HEAD_INITIALIZER(devices);
  134 
  135 static struct linux_device_handler null_handler =
  136         { "mem", "mem", "null", "null", 1, 3, 1};
  137 
  138 DATA_SET(linux_device_handler_set, null_handler);
  139 
  140 char *
  141 linux_driver_get_name_dev(device_t dev)
  142 {
  143         struct device_element *de;
  144         const char *device_name = device_get_name(dev);
  145 
  146         if (device_name == NULL)
  147                 return (NULL);
  148         TAILQ_FOREACH(de, &devices, list) {
  149                 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
  150                         return (de->entry.linux_driver_name);
  151         }
  152 
  153         return (NULL);
  154 }
  155 
  156 int
  157 linux_driver_get_major_minor(const char *node, int *major, int *minor)
  158 {
  159         struct device_element *de;
  160         unsigned long devno;
  161         size_t sz;
  162 
  163         if (node == NULL || major == NULL || minor == NULL)
  164                 return (1);
  165 
  166         sz = sizeof("pts/") - 1;
  167         if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
  168                 /*
  169                  * Linux checks major and minors of the slave device
  170                  * to make sure it's a pty device, so let's make him
  171                  * believe it is.
  172                  */
  173                 devno = strtoul(node + sz, NULL, 10);
  174                 *major = 136 + (devno / 256);
  175                 *minor = devno % 256;
  176                 return (0);
  177         }
  178 
  179         sz = sizeof("dri/card") - 1;
  180         if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
  181                 devno = strtoul(node + sz, NULL, 10);
  182                 *major = 226 + (devno / 256);
  183                 *minor = devno % 256;
  184                 return (0);
  185         }
  186         sz = sizeof("dri/controlD") - 1;
  187         if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
  188                 devno = strtoul(node + sz, NULL, 10);
  189                 *major = 226 + (devno / 256);
  190                 *minor = devno % 256;
  191                 return (0);
  192         }
  193         sz = sizeof("dri/renderD") - 1;
  194         if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
  195                 devno = strtoul(node + sz, NULL, 10);
  196                 *major = 226 + (devno / 256);
  197                 *minor = devno % 256;
  198                 return (0);
  199         }
  200         sz = sizeof("drm/") - 1;
  201         if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
  202                 devno = strtoul(node + sz, NULL, 10);
  203                 *major = 226 + (devno / 256);
  204                 *minor = devno % 256;
  205                 return (0);
  206         }
  207 
  208         TAILQ_FOREACH(de, &devices, list) {
  209                 if (strcmp(node, de->entry.bsd_device_name) == 0) {
  210                         *major = de->entry.linux_major;
  211                         *minor = de->entry.linux_minor;
  212                         return (0);
  213                 }
  214         }
  215 
  216         return (1);
  217 }
  218 
  219 int
  220 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor)
  221 {
  222         int error;
  223 
  224         if (vp->v_type != VCHR)
  225                 return (ENOTBLK);
  226         dev_lock();
  227         if (vp->v_rdev == NULL) {
  228                 dev_unlock();
  229                 return (ENXIO);
  230         }
  231         error = linux_driver_get_major_minor(devtoname(vp->v_rdev),
  232             major, minor);
  233         dev_unlock();
  234         return (error);
  235 }
  236 
  237 char *
  238 linux_get_char_devices()
  239 {
  240         struct device_element *de;
  241         char *temp, *string, *last;
  242         char formated[256];
  243         int current_size = 0, string_size = 1024;
  244 
  245         string = malloc(string_size, M_LINUX, M_WAITOK);
  246         string[0] = '\000';
  247         last = "";
  248         TAILQ_FOREACH(de, &devices, list) {
  249                 if (!de->entry.linux_char_device)
  250                         continue;
  251                 temp = string;
  252                 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
  253                         last = de->entry.bsd_driver_name;
  254 
  255                         snprintf(formated, sizeof(formated), "%3d %s\n",
  256                                  de->entry.linux_major,
  257                                  de->entry.linux_device_name);
  258                         if (strlen(formated) + current_size
  259                             >= string_size) {
  260                                 string_size *= 2;
  261                                 string = malloc(string_size,
  262                                     M_LINUX, M_WAITOK);
  263                                 bcopy(temp, string, current_size);
  264                                 free(temp, M_LINUX);
  265                         }
  266                         strcat(string, formated);
  267                         current_size = strlen(string);
  268                 }
  269         }
  270 
  271         return (string);
  272 }
  273 
  274 void
  275 linux_free_get_char_devices(char *string)
  276 {
  277 
  278         free(string, M_LINUX);
  279 }
  280 
  281 static int linux_major_starting = 200;
  282 
  283 int
  284 linux_device_register_handler(struct linux_device_handler *d)
  285 {
  286         struct device_element *de;
  287 
  288         if (d == NULL)
  289                 return (EINVAL);
  290 
  291         de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
  292         if (d->linux_major < 0) {
  293                 d->linux_major = linux_major_starting++;
  294         }
  295         bcopy(d, &de->entry, sizeof(*d));
  296 
  297         /* Add the element to the list, sorted on span. */
  298         TAILQ_INSERT_TAIL(&devices, de, list);
  299 
  300         return (0);
  301 }
  302 
  303 int
  304 linux_device_unregister_handler(struct linux_device_handler *d)
  305 {
  306         struct device_element *de;
  307 
  308         if (d == NULL)
  309                 return (EINVAL);
  310 
  311         TAILQ_FOREACH(de, &devices, list) {
  312                 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
  313                         TAILQ_REMOVE(&devices, de, list);
  314                         free(de, M_LINUX);
  315 
  316                         return (0);
  317                 }
  318         }
  319 
  320         return (EINVAL);
  321 }
Cache object: 12a71bcdbcc5e7c07b3c766458177ba1
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_util.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_util.c
