The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1994 Christos Zoulas
    3  * Copyright (c) 1995 Frank van der Linden
    4  * Copyright (c) 1995 Scott Bartram
    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  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  *      from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/10.2/sys/compat/linux/linux_util.c 235063 2012-05-05 19:42:38Z netchild $");
   34 
   35 #include "opt_compat.h"
   36 #include "opt_kdtrace.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/bus.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/kernel.h>
   44 #include <sys/linker_set.h>
   45 #include <sys/mutex.h>
   46 #include <sys/namei.h>
   47 #include <sys/proc.h>
   48 #include <sys/sdt.h>
   49 #include <sys/syscallsubr.h>
   50 #include <sys/systm.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <machine/stdarg.h>
   54 
   55 #include <compat/linux/linux_util.h>
   56 #ifdef COMPAT_LINUX32
   57 #include <machine/../linux32/linux.h>
   58 #else
   59 #include <machine/../linux/linux.h>
   60 #endif
   61 
   62 #include <compat/linux/linux_dtrace.h>
   63 
   64 const char      linux_emul_path[] = "/compat/linux";
   65 
   66 /* DTrace init */
   67 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   68 
   69 /**
   70  * DTrace probes in this module.
   71  */
   72 LIN_SDT_PROBE_DEFINE5(util, linux_emul_convpath, entry, "const char *",
   73     "enum uio_seg", "char **", "int", "int");
   74 LIN_SDT_PROBE_DEFINE1(util, linux_emul_convpath, return, "int");
   75 LIN_SDT_PROBE_DEFINE1(util, linux_msg, entry, "const char *");
   76 LIN_SDT_PROBE_DEFINE0(util, linux_msg, return);
   77 LIN_SDT_PROBE_DEFINE2(util, linux_driver_get_name_dev, entry, "device_t",
   78     "const char *");
   79 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_name_dev, nullcall);
   80 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_name_dev, return, "char *");
   81 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, entry, "char *",
   82     "int *", "int *");
   83 LIN_SDT_PROBE_DEFINE0(util, linux_driver_get_major_minor, nullcall);
   84 LIN_SDT_PROBE_DEFINE1(util, linux_driver_get_major_minor, notfound, "char *");
   85 LIN_SDT_PROBE_DEFINE3(util, linux_driver_get_major_minor, return, "int",
   86     "int", "int");
   87 LIN_SDT_PROBE_DEFINE0(util, linux_get_char_devices, entry);
   88 LIN_SDT_PROBE_DEFINE1(util, linux_get_char_devices, return, "char *");
   89 LIN_SDT_PROBE_DEFINE1(util, linux_free_get_char_devices, entry, "char *");
   90 LIN_SDT_PROBE_DEFINE0(util, linux_free_get_char_devices, return);
   91 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, entry,
   92     "struct linux_device_handler *");
   93 LIN_SDT_PROBE_DEFINE1(util, linux_device_register_handler, return, "int");
   94 LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, entry,
   95     "struct linux_device_handler *");
   96 LIN_SDT_PROBE_DEFINE1(util, linux_device_unregister_handler, return, "int");
   97 
   98 /*
   99  * Search an alternate path before passing pathname arguments on to
  100  * system calls. Useful for keeping a separate 'emulation tree'.
  101  *
  102  * If cflag is set, we check if an attempt can be made to create the
  103  * named file, i.e. we check if the directory it should be in exists.
  104  */
  105 int
  106 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
  107     char **pbuf, int cflag, int dfd)
  108 {
  109         int retval;
  110 
  111         LIN_SDT_PROBE5(util, linux_emul_convpath, entry, path, pathseg, pbuf,
  112             cflag, dfd);
  113 
  114         retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
  115             cflag, dfd);
  116 
  117         LIN_SDT_PROBE1(util, linux_emul_convpath, return, retval);
  118         return (retval);
  119 }
  120 
  121 void
  122 linux_msg(const struct thread *td, const char *fmt, ...)
  123 {
  124         va_list ap;
  125         struct proc *p;
  126 
  127         LIN_SDT_PROBE1(util, linux_msg, entry, fmt);
  128 
  129         p = td->td_proc;
  130         printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
  131         va_start(ap, fmt);
  132         vprintf(fmt, ap);
  133         va_end(ap);
  134         printf("\n");
  135 
  136         LIN_SDT_PROBE0(util, linux_msg, return);
  137 }
  138 
  139 struct device_element
  140 {
  141         TAILQ_ENTRY(device_element) list;
  142         struct linux_device_handler entry;
  143 };
  144 
  145 static TAILQ_HEAD(, device_element) devices =
  146         TAILQ_HEAD_INITIALIZER(devices);
  147 
  148 static struct linux_device_handler null_handler =
  149         { "mem", "mem", "null", "null", 1, 3, 1};
  150 
  151 DATA_SET(linux_device_handler_set, null_handler);
  152 
  153 char *
  154 linux_driver_get_name_dev(device_t dev)
  155 {
  156         struct device_element *de;
  157         const char *device_name = device_get_name(dev);
  158 
  159         LIN_SDT_PROBE2(util, linux_driver_get_name_dev, entry, dev,
  160             device_name);
  161 
  162         if (device_name == NULL) {
  163                 LIN_SDT_PROBE0(util, linux_driver_get_name_dev, nullcall);
  164                 LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
  165                 return NULL;
  166         }
  167         TAILQ_FOREACH(de, &devices, list) {
  168                 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) {
  169                         LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return,
  170                             de->entry.linux_driver_name);
  171                         return (de->entry.linux_driver_name);
  172                 }
  173         }
  174 
  175         LIN_SDT_PROBE1(util, linux_driver_get_name_dev, return, NULL);
  176         return NULL;
  177 }
  178 
  179 int
  180 linux_driver_get_major_minor(const char *node, int *major, int *minor)
  181 {
  182         struct device_element *de;
  183 
  184         LIN_SDT_PROBE3(util, linux_driver_get_major_minor, entry, node, major,
  185             minor);
  186 
  187         if (node == NULL || major == NULL || minor == NULL) {
  188                 LIN_SDT_PROBE0(util, linux_driver_get_major_minor, nullcall);
  189                 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1,
  190                    0, 0);
  191                 return 1;
  192         }
  193 
  194         if (strlen(node) > strlen("pts/") &&
  195             strncmp(node, "pts/", strlen("pts/")) == 0) {
  196                 unsigned long devno;
  197 
  198                 /*
  199                  * Linux checks major and minors of the slave device
  200                  * to make sure it's a pty device, so let's make him
  201                  * believe it is.
  202                  */
  203                 devno = strtoul(node + strlen("pts/"), NULL, 10);
  204                 *major = 136 + (devno / 256);
  205                 *minor = devno % 256;
  206 
  207                 LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 0,
  208                     *major, *minor);
  209                 return 0;
  210         }
  211 
  212         TAILQ_FOREACH(de, &devices, list) {
  213                 if (strcmp(node, de->entry.bsd_device_name) == 0) {
  214                         *major = de->entry.linux_major;
  215                         *minor = de->entry.linux_minor;
  216 
  217                         LIN_SDT_PROBE3(util, linux_driver_get_major_minor,
  218                             return, 0, *major, *minor);
  219                         return 0;
  220                 }
  221         }
  222 
  223         LIN_SDT_PROBE1(util, linux_driver_get_major_minor, notfound, node);
  224         LIN_SDT_PROBE3(util, linux_driver_get_major_minor, return, 1, 0, 0);
  225         return 1;
  226 }
  227 
  228 char *
  229 linux_get_char_devices()
  230 {
  231         struct device_element *de;
  232         char *temp, *string, *last;
  233         char formated[256];
  234         int current_size = 0, string_size = 1024;
  235 
  236         LIN_SDT_PROBE0(util, linux_get_char_devices, entry);
  237 
  238         string = malloc(string_size, M_LINUX, M_WAITOK);
  239         string[0] = '\000';
  240         last = "";
  241         TAILQ_FOREACH(de, &devices, list) {
  242                 if (!de->entry.linux_char_device)
  243                         continue;
  244                 temp = string;
  245                 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
  246                         last = de->entry.bsd_driver_name;
  247 
  248                         snprintf(formated, sizeof(formated), "%3d %s\n",
  249                                  de->entry.linux_major,
  250                                  de->entry.linux_device_name);
  251                         if (strlen(formated) + current_size
  252                             >= string_size) {
  253                                 string_size *= 2;
  254                                 string = malloc(string_size,
  255                                     M_LINUX, M_WAITOK);
  256                                 bcopy(temp, string, current_size);
  257                                 free(temp, M_LINUX);
  258                         }
  259                         strcat(string, formated);
  260                         current_size = strlen(string);
  261                 }
  262         }
  263 
  264         LIN_SDT_PROBE1(util, linux_get_char_devices, return, string);
  265         return string;
  266 }
  267 
  268 void
  269 linux_free_get_char_devices(char *string)
  270 {
  271 
  272         LIN_SDT_PROBE1(util, linux_get_char_devices, entry, string);
  273 
  274         free(string, M_LINUX);
  275 
  276         LIN_SDT_PROBE0(util, linux_get_char_devices, return);
  277 }
  278 
  279 static int linux_major_starting = 200;
  280 
  281 int
  282 linux_device_register_handler(struct linux_device_handler *d)
  283 {
  284         struct device_element *de;
  285 
  286         LIN_SDT_PROBE1(util, linux_device_register_handler, entry, d);
  287 
  288         if (d == NULL) {
  289                 LIN_SDT_PROBE1(util, linux_device_register_handler, return,
  290                     EINVAL);
  291                 return (EINVAL);
  292         }
  293 
  294         de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
  295         if (d->linux_major < 0) {
  296                 d->linux_major = linux_major_starting++;
  297         }
  298         bcopy(d, &de->entry, sizeof(*d));
  299 
  300         /* Add the element to the list, sorted on span. */
  301         TAILQ_INSERT_TAIL(&devices, de, list);
  302 
  303         LIN_SDT_PROBE1(util, linux_device_register_handler, return, 0);
  304         return (0);
  305 }
  306 
  307 int
  308 linux_device_unregister_handler(struct linux_device_handler *d)
  309 {
  310         struct device_element *de;
  311 
  312         LIN_SDT_PROBE1(util, linux_device_unregister_handler, entry, d);
  313 
  314         if (d == NULL) {
  315                 LIN_SDT_PROBE1(util, linux_device_unregister_handler, return,
  316                     EINVAL);
  317                 return (EINVAL);
  318         }
  319 
  320         TAILQ_FOREACH(de, &devices, list) {
  321                 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
  322                         TAILQ_REMOVE(&devices, de, list);
  323                         free(de, M_LINUX);
  324 
  325                         LIN_SDT_PROBE1(util, linux_device_unregister_handler,
  326                             return, 0);
  327                         return (0);
  328                 }
  329         }
  330 
  331         LIN_SDT_PROBE1(util, linux_device_unregister_handler, return, EINVAL);
  332         return (EINVAL);
  333 }

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