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 59MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 60MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 61MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes"); 62MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc"); 63 64FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator"); 65FEATURE(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 */ 78LIN_SDT_PROVIDER_DEFINE(linuxulator); 79LIN_SDT_PROVIDER_DEFINE(linuxulator32); 80 81char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 82 83SYSCTL_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 */ 94int 95linux_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 106void 107linux_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 123struct device_element 124{ 125 TAILQ_ENTRY(device_element) list; 126 struct linux_device_handler entry; 127}; 128 129static TAILQ_HEAD(, device_element) devices = 130 TAILQ_HEAD_INITIALIZER(devices); 131 132static struct linux_device_handler null_handler = 133 { "mem", "mem", "null", "null", 1, 3, 1}; 134 135DATA_SET(linux_device_handler_set, null_handler); 136 137char * 138linux_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 153int 154linux_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 216char * 217linux_get_char_devices() 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 253void 254linux_free_get_char_devices(char *string) 255{ 256 257 free(string, M_LINUX); 258} 259 260static int linux_major_starting = 200; 261 262int 263linux_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 282int 283linux_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} 301