freebsd-dev/sys/compat/linux/linux_util.c
Edward Tomasz Napierala b5f20658ee Add compat.linux.emul_path, so it can be set to something other
than "/compat/linux".  Useful when you have several compat directories
with different Linux versions and you don't want to clash with files
installed by linux-c7 packages.

Reviewed by:	bcr (manpages)
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22574
2019-12-16 20:07:04 +00:00

280 lines
7.1 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1994 Christos Zoulas
* Copyright (c) 1995 Frank van der Linden
* Copyright (c) 1995 Scott Bartram
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/fcntl.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/linker_set.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/sdt.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <machine/stdarg.h>
#include <compat/linux/linux_mib.h>
#include <compat/linux/linux_util.h>
MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes");
MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc");
char linux_emul_path[MAXPATHLEN] = "/compat/linux";
SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
linux_emul_path, sizeof(linux_emul_path),
"Linux runtime environment path");
/*
* Search an alternate path before passing pathname arguments on to
* system calls. Useful for keeping a separate 'emulation tree'.
*
* If cflag is set, we check if an attempt can be made to create the
* named file, i.e. we check if the directory it should be in exists.
*/
int
linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
char **pbuf, int cflag, int dfd)
{
int retval;
retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
cflag, dfd);
return (retval);
}
void
linux_msg(const struct thread *td, const char *fmt, ...)
{
va_list ap;
struct proc *p;
p = td->td_proc;
printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
struct device_element
{
TAILQ_ENTRY(device_element) list;
struct linux_device_handler entry;
};
static TAILQ_HEAD(, device_element) devices =
TAILQ_HEAD_INITIALIZER(devices);
static struct linux_device_handler null_handler =
{ "mem", "mem", "null", "null", 1, 3, 1};
DATA_SET(linux_device_handler_set, null_handler);
char *
linux_driver_get_name_dev(device_t dev)
{
struct device_element *de;
const char *device_name = device_get_name(dev);
if (device_name == NULL)
return (NULL);
TAILQ_FOREACH(de, &devices, list) {
if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
return (de->entry.linux_driver_name);
}
return (NULL);
}
int
linux_driver_get_major_minor(const char *node, int *major, int *minor)
{
struct device_element *de;
unsigned long devno;
size_t sz;
if (node == NULL || major == NULL || minor == NULL)
return (1);
sz = sizeof("pts/") - 1;
if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
/*
* Linux checks major and minors of the slave device
* to make sure it's a pty device, so let's make him
* believe it is.
*/
devno = strtoul(node + sz, NULL, 10);
*major = 136 + (devno / 256);
*minor = devno % 256;
return (0);
}
sz = sizeof("dri/card") - 1;
if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
devno = strtoul(node + sz, NULL, 10);
*major = 226 + (devno / 256);
*minor = devno % 256;
return (0);
}
sz = sizeof("dri/controlD") - 1;
if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
devno = strtoul(node + sz, NULL, 10);
*major = 226 + (devno / 256);
*minor = devno % 256;
return (0);
}
sz = sizeof("dri/renderD") - 1;
if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
devno = strtoul(node + sz, NULL, 10);
*major = 226 + (devno / 256);
*minor = devno % 256;
return (0);
}
sz = sizeof("drm/") - 1;
if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
devno = strtoul(node + sz, NULL, 10);
*major = 226 + (devno / 256);
*minor = devno % 256;
return (0);
}
TAILQ_FOREACH(de, &devices, list) {
if (strcmp(node, de->entry.bsd_device_name) == 0) {
*major = de->entry.linux_major;
*minor = de->entry.linux_minor;
return (0);
}
}
return (1);
}
char *
linux_get_char_devices()
{
struct device_element *de;
char *temp, *string, *last;
char formated[256];
int current_size = 0, string_size = 1024;
string = malloc(string_size, M_LINUX, M_WAITOK);
string[0] = '\000';
last = "";
TAILQ_FOREACH(de, &devices, list) {
if (!de->entry.linux_char_device)
continue;
temp = string;
if (strcmp(last, de->entry.bsd_driver_name) != 0) {
last = de->entry.bsd_driver_name;
snprintf(formated, sizeof(formated), "%3d %s\n",
de->entry.linux_major,
de->entry.linux_device_name);
if (strlen(formated) + current_size
>= string_size) {
string_size *= 2;
string = malloc(string_size,
M_LINUX, M_WAITOK);
bcopy(temp, string, current_size);
free(temp, M_LINUX);
}
strcat(string, formated);
current_size = strlen(string);
}
}
return (string);
}
void
linux_free_get_char_devices(char *string)
{
free(string, M_LINUX);
}
static int linux_major_starting = 200;
int
linux_device_register_handler(struct linux_device_handler *d)
{
struct device_element *de;
if (d == NULL)
return (EINVAL);
de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
if (d->linux_major < 0) {
d->linux_major = linux_major_starting++;
}
bcopy(d, &de->entry, sizeof(*d));
/* Add the element to the list, sorted on span. */
TAILQ_INSERT_TAIL(&devices, de, list);
return (0);
}
int
linux_device_unregister_handler(struct linux_device_handler *d)
{
struct device_element *de;
if (d == NULL)
return (EINVAL);
TAILQ_FOREACH(de, &devices, list) {
if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
TAILQ_REMOVE(&devices, de, list);
free(de, M_LINUX);
return (0);
}
}
return (EINVAL);
}