linux_util.c

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    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/fcntl.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/kernel.h>
   43 #include <sys/linker_set.h>
   44 #include <sys/mutex.h>
   45 #include <sys/namei.h>
   46 #include <sys/proc.h>
   47 #include <sys/sdt.h>
   48 #include <sys/syscallsubr.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/systm.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <machine/stdarg.h>
   54 
   55 #include <compat/linux/linux_dtrace.h>
   56 #include <compat/linux/linux_mib.h>
   57 #include <compat/linux/linux_util.h>
   58 
   59 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
   60 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
   61 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes");
   62 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc");
   63 
   64 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
   65 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
   66 
   67 /**
   68  * Special DTrace provider for the linuxulator.
   69  *
   70  * In this file we define the provider for the entire linuxulator. All
   71  * modules (= files of the linuxulator) use it.
   72  *
   73  * We define a different name depending on the emulated bitsize, see
   74  * ../../<ARCH>/linux{,32}/linux.h, e.g.:
   75  *      native bitsize          = linuxulator
   76  *      amd64, 32bit emulation  = linuxulator32
   77  */
   78 LIN_SDT_PROVIDER_DEFINE(linuxulator);
   79 LIN_SDT_PROVIDER_DEFINE(linuxulator32);
   80 
   81 char linux_emul_path[MAXPATHLEN] = "/compat/linux";
   82 
   83 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
   84     linux_emul_path, sizeof(linux_emul_path),
   85     "Linux runtime environment path");
   86 
   87 /*
   88  * Search an alternate path before passing pathname arguments on to
   89  * system calls. Useful for keeping a separate 'emulation tree'.
   90  *
   91  * If cflag is set, we check if an attempt can be made to create the
   92  * named file, i.e. we check if the directory it should be in exists.
   93  */
   94 int
   95 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
   96     char **pbuf, int cflag, int dfd)
   97 {
   98         int retval;
   99 
  100         retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
  101             cflag, dfd);
  102 
  103         return (retval);
  104 }
  105 
  106 void
  107 linux_msg(const struct thread *td, const char *fmt, ...)
  108 {
  109         va_list ap;
  110         struct proc *p;
  111 
  112         if (linux_debug == 0)
  113                 return;
  114 
  115         p = td->td_proc;
  116         printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
  117         va_start(ap, fmt);
  118         vprintf(fmt, ap);
  119         va_end(ap);
  120         printf("\n");
  121 }
  122 
  123 struct device_element
  124 {
  125         TAILQ_ENTRY(device_element) list;
  126         struct linux_device_handler entry;
  127 };
  128 
  129 static TAILQ_HEAD(, device_element) devices =
  130         TAILQ_HEAD_INITIALIZER(devices);
  131 
  132 static struct linux_device_handler null_handler =
  133         { "mem", "mem", "null", "null", 1, 3, 1};
  134 
  135 DATA_SET(linux_device_handler_set, null_handler);
  136 
  137 char *
  138 linux_driver_get_name_dev(device_t dev)
  139 {
  140         struct device_element *de;
  141         const char *device_name = device_get_name(dev);
  142 
  143         if (device_name == NULL)
  144                 return (NULL);
  145         TAILQ_FOREACH(de, &devices, list) {
  146                 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
  147                         return (de->entry.linux_driver_name);
  148         }
  149 
  150         return (NULL);
  151 }
  152 
  153 int
  154 linux_driver_get_major_minor(const char *node, int *major, int *minor)
  155 {
  156         struct device_element *de;
  157         unsigned long devno;
  158         size_t sz;
  159 
  160         if (node == NULL || major == NULL || minor == NULL)
  161                 return (1);
  162 
  163         sz = sizeof("pts/") - 1;
  164         if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
  165                 /*
  166                  * Linux checks major and minors of the slave device
  167                  * to make sure it's a pty device, so let's make him
  168                  * believe it is.
  169                  */
  170                 devno = strtoul(node + sz, NULL, 10);
  171                 *major = 136 + (devno / 256);
  172                 *minor = devno % 256;
  173                 return (0);
  174         }
  175 
  176         sz = sizeof("dri/card") - 1;
  177         if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
  178                 devno = strtoul(node + sz, NULL, 10);
  179                 *major = 226 + (devno / 256);
  180                 *minor = devno % 256;
  181                 return (0);
  182         }
  183         sz = sizeof("dri/controlD") - 1;
  184         if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
  185                 devno = strtoul(node + sz, NULL, 10);
  186                 *major = 226 + (devno / 256);
  187                 *minor = devno % 256;
  188                 return (0);
  189         }
  190         sz = sizeof("dri/renderD") - 1;
  191         if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
  192                 devno = strtoul(node + sz, NULL, 10);
  193                 *major = 226 + (devno / 256);
  194                 *minor = devno % 256;
  195                 return (0);
  196         }
  197         sz = sizeof("drm/") - 1;
  198         if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
  199                 devno = strtoul(node + sz, NULL, 10);
  200                 *major = 226 + (devno / 256);
  201                 *minor = devno % 256;
  202                 return (0);
  203         }
  204 
  205         TAILQ_FOREACH(de, &devices, list) {
  206                 if (strcmp(node, de->entry.bsd_device_name) == 0) {
  207                         *major = de->entry.linux_major;
  208                         *minor = de->entry.linux_minor;
  209                         return (0);
  210                 }
  211         }
  212 
  213         return (1);
  214 }
  215 
  216 char *
  217 linux_get_char_devices(void)
  218 {
  219         struct device_element *de;
  220         char *temp, *string, *last;
  221         char formated[256];
  222         int current_size = 0, string_size = 1024;
  223 
  224         string = malloc(string_size, M_LINUX, M_WAITOK);
  225         string[0] = '\000';
  226         last = "";
  227         TAILQ_FOREACH(de, &devices, list) {
  228                 if (!de->entry.linux_char_device)
  229                         continue;
  230                 temp = string;
  231                 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
  232                         last = de->entry.bsd_driver_name;
  233 
  234                         snprintf(formated, sizeof(formated), "%3d %s\n",
  235                                  de->entry.linux_major,
  236                                  de->entry.linux_device_name);
  237                         if (strlen(formated) + current_size
  238                             >= string_size) {
  239                                 string_size *= 2;
  240                                 string = malloc(string_size,
  241                                     M_LINUX, M_WAITOK);
  242                                 bcopy(temp, string, current_size);
  243                                 free(temp, M_LINUX);
  244                         }
  245                         strcat(string, formated);
  246                         current_size = strlen(string);
  247                 }
  248         }
  249 
  250         return (string);
  251 }
  252 
  253 void
  254 linux_free_get_char_devices(char *string)
  255 {
  256 
  257         free(string, M_LINUX);
  258 }
  259 
  260 static int linux_major_starting = 200;
  261 
  262 int
  263 linux_device_register_handler(struct linux_device_handler *d)
  264 {
  265         struct device_element *de;
  266 
  267         if (d == NULL)
  268                 return (EINVAL);
  269 
  270         de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
  271         if (d->linux_major < 0) {
  272                 d->linux_major = linux_major_starting++;
  273         }
  274         bcopy(d, &de->entry, sizeof(*d));
  275 
  276         /* Add the element to the list, sorted on span. */
  277         TAILQ_INSERT_TAIL(&devices, de, list);
  278 
  279         return (0);
  280 }
  281 
  282 int
  283 linux_device_unregister_handler(struct linux_device_handler *d)
  284 {
  285         struct device_element *de;
  286 
  287         if (d == NULL)
  288                 return (EINVAL);
  289 
  290         TAILQ_FOREACH(de, &devices, list) {
  291                 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
  292                         TAILQ_REMOVE(&devices, de, list);
  293                         free(de, M_LINUX);
  294 
  295                         return (0);
  296                 }
  297         }
  298 
  299         return (EINVAL);
  300 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_util.c

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