Date: Wed, 18 Oct 1995 17:41:48 -0500 (EST) From: John Fieber <jfieber@indiana.edu> To: Nate Williams <nate@rocky.sri.MT.net> Cc: stable@FreeBSD.org Subject: Re: Linux emulator working? Message-ID: <Pine.BSF.3.91.951018174034.13692A-100000@fieber-john.campusview.indiana.edu> In-Reply-To: <199510182217.QAA11314@rocky.sri.MT.net>
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On Wed, 18 Oct 1995, Nate Williams wrote: > Does anyone have the emulator working under -stable? > > Here's the steps I did: ... > What am I doing wrong? What can I do to fix this? I'm going to try to > get Linux-IDL running under FreeBSD to see how the performance compares > to the SPARC version we have. Maybe the attached will help? -john == jfieber@indiana.edu =========================================== == http://fieber-john.campusview.indiana.edu/~jfieber ============ >From rich@lamprey.utmb.eduWed Oct 18 17:40:15 1995 Date: Wed, 20 Sep 1995 09:27:00 -0500 From: Rich Murphey <rich@lamprey.utmb.edu> To: FreeBSD-current@freefall.freebsd.org Subject: linux compatibility man page I took netbsd's man page for linux compatibility and added a brief installation guide. I've sent Jordan the nroff source for review. Any suggestions are welcome! Many thanks to Soren Schmidt for the emulator itself! Rich COMPAT LINUX(8) UNIX System Manager's Manual COMPAT LINUX(8) - - NAME COMPAT LINUX - setup procedure for running Linux binaries - INSTALL In order to run static and dynamicly linked Linux binaries, you need a kernel configured with options COMPAT LINUX. Include options SYSVSHM as - well if you plan to run the linux version of doom. cd /sys/i386/conf echo options '"COMPAT LINUX"' >> GENERIC - echo options SYSVSHM >> GENERIC config GENERIC cd /sys/compile/GENERIC make depend; make make install If you don't already have it, build the loadable kernel module /lkm/linux mod.o. - cd /usr/src/lkm/linux make all install clean Once you have both the kernel and lkm installed, invoke linux as root to load the emulator into the kernel. TESTING To test the emulator using the linux version of the game doom, first get the linux shared libraries. mkdir /compat/linux cd /compat/linux ncftp ftp.freebsd.org:pub/FreeBSD/2.0.5-RELEASE/xperimnt/linux-emu/linux-emu.tar.gz tar xzf linux-emu.tar.gz rm -rf usr lkm linux-emu.tar.gz The lkm and usr portion of this tar file are redundant since you already have the lkm and /usr/bin/linux. Next install doom itself. ncftp ftp.freebsd.org:pub/FreeBSD/2.0.5-RELEASE/xperimnt/linux-emu/linux-doom-1.8.tar.gz tar xzf linux-doom-1.8.tar.gz cd doom-1.8 xdoom DESCRIPTION Most Linux binaries should work, except programs that use Linux-specific features. These include the Linux /proc filesystem (which is different from the optional FreeBSD /proc filesystem), and i386-specific calls, such as enabling virtual 8086 mode. Many linux programs are dynamically linked. So you will also need the Linux shared libraries that the program depends on, and the runtime link- er. Also, you will need to create a "shadow root" directory for Linux binaries on your FreeBSD system. This directory is named /compat/linux. Any file operations done by Linux programs run under FreeBSD will look in this directory first. So, if a Linux program opens, for example, /etc/passwd, FreeBSD will first try to open /compat/linux/etc/passwd, and if that does not exist open the packages that include configuration files, etc under /compat/linux, to avoid naming conflicts with possible FreeBSD counterparts. Shared libraries should also be installed in the shadow tree. Generally, you will need to look for the shared libraries that Linux bi- naries depend on only the first few times that you install a Linux pro- gram on your FreeBSD system. After a while, you will have a sufficient set of Linux shared libraries on your system to be able to run newly im- ported Linux binaries without any extra work. Setting up shared libraries How to get to know which shared libraries Linux binaries need, and where to get them? Basically, there are 2 possibilities (when following these instructions: you will need to be root on your FreeBSD system to do the necessary installation steps). 1. If you have access to a Linux system, see what shared libraries it needs, and copy them to your FreeBSD system. Example: you have just ftp-ed the Linux binary of Doom. Put it on the Linux system you have access to, and check which shared libraries it needs by running `ldd linuxxdoom': (me@linux) ldd linuxxdoom libXt.so.3 (DLL Jump 3.1) => /usr/X11/lib/libXt.so.3.1.0 libX11.so.3 (DLL Jump 3.1) => /usr/X11/lib/libX11.so.3.1.0 libc.so.4 (DLL Jump 4.5pl26) => /lib/libc.so.4.6.29 You would need go get all the files from the last column, and put them under /compat/linux, with the names in the first column as sym- bolic links pointing to them. This means you eventually have these files on your FreeBSD system: /compat/linux/usr/X11/lib/libXt.so.3.1.0 /compat/linux/usr/X11/lib/libXt.so.3 (symbolic link to the above) /compat/linux/usr/X11/lib/libX11.so.3.1.0 /compat/linux/usr/X11/lib/libX11.so.3 (symbolic link to the above) /compat/linux/lib/libc.so.4.6.29 /compat/linux/lib/libc.so.4 (symbolic link to the above) Note that if you already have a Linux shared library with a matching major revision number to the first column of the 'ldd' output, you won't need to copy the file named in the last column to your system, the one you already have should work. It is advisable to copy the shared library anyway if it is a newer version, though. You can re- move the old one, as long as you make the symbolic link point to the new one. So, if you have these libraries on your system: /compat/linux/lib/libc.so.4.6.27 /compat/linux/lib/libc.so.4 -> /compat/linux/lib/libc.so.4.6.27 and you find that the ldd output for a new binary you want to in- stall is: libc.so.4 (DLL Jump 4.5pl26) => /lib/libc.so.4.6.29 you won't need to worry about copying /lib/libc.so.4.6.29 too, be- cause the program should work fine with the slightly older version. You can decide to replace the libc.so anyway, and that should leave you with: /compat/linux/lib/libc.so.4.6.29 /compat/linux/lib/libc.so.4 -> /compat/linux/lib/libc.so.4.6.29 Please note that the symbolic link mechanism is only needed for Lin- ux binaries, the FreeBSD runtime linker takes care of looking for matching major revision numbers itself, you don't need to worry about that. Finally, you must make sure that you have the Linux runtime linker and its config files on your system. You should copy these files from the Linux system to their appropriate place on your FreeBSD system (to the /compat/linux tree): /lib/ld.so /etc/ld.so.cache /etc/ld.so.config 2. You don't have access to a Linux system. In that case, you should get the extra files you need from various ftp sites. Information on where to look for the various files is appended below. For now, let's assume you know where to get the files. Retrieve the following files (all from the same ftp site to avoid any version mismatches), and install them under /compat/linux (i.e. /foo/bar is installed as /compat/linux/foo/bar): /sbin/ldconfig /usr/bin/ldd /lib/libc.so.x.y.z /lib/ld.so ldconfig and ldd don't necessarily need to be under /compat/linux, you can install them elsewhere in the system too. Just make sure they don't conflict with their FreeBSD counterparts. A good idea would be to install them in /usr/local/bin as ldconfig-linux and ldd-linux. Create the file /compat/linux/etc/ld.so.conf, containing the direc- tories in which the Linux runtime linker should look for shared libs. It is a plain text file, containing a directory name on each line. /lib and /usr/lib are standard, you could add the following: /usr/X11/lib /usr/local/lib Note that these are mapped to /compat/linux/XXXX by FreeBSD's compat code, and should exist as such on your system. Run the Linux ldconfig program. It should be statically linked, so it doesn't need any shared libraries by itself. It will create the file /compat/linux/etc/ld.so.cache You should rerun the Linux ver- sion of the ldconfig program each time you add a new shared library. You should now be set up for Linux binaries which only need a shared libc. You can test this by running the Linux ldd on itself. Suppose that you have it installed as ldd-linux, it should produce something like: (me@FreeBSD) ldd-linux `which ldd-linux` libc.so.4 (DLL Jump 4.5pl26) => /lib/libc.so.4.6.29 This being done, you are ready to install new Linux binaries. When- ever you install a new Linux program, you should check if it needs shared libraries, and if so, whether you have them installed in the /compat/linux tree. To do this, you run the Linux version ldd on the new program, and watch its output. ldd (see also the manual page for ldd(1)) will print a list of shared libraries that the program depends on, in the form <majorname> (<jumpversion>) => <fullname>. If it prints "not found" in stead of <fullname> it means that you need an extra library. Which library this is, is shown in <major- name>, which will be of the form libXXXX.so.<N> You will need to find a libXXXX.so.<N>.<mm> on a Linux ftp site, and install it on your system. The XXXX (name) and <N> (major revision number) should match; the minor number(s) <mm> are less important, though it is ad- vised to take the most recent version. Finding the necessary files. Note: the information below is valid as of the ime this document was written (March, 1995), but certain details such as names of ftp sites, directories and distribution names may have changed by the time you read this. Linux is distributed by several groups that make their own set of bina- ries that they distribute. Each distribution has its own name, like "Slackware" or "Yggdrasil". The distributions are available on a lot of ftp sites. Sometimes the files are unpacked, and you can get the individ- ual files you need, but mostly they are stored in distribution sets, usu- ally consisting of subdirectories with gzipped tar files in them. The primary ftp sites for the distributions are: sunsite.unc.edu:/pub/Linux/distributions tsx-11.mit.edu:/pub/linux/distributions Some European mirrors: ftp.luth.se:/pub/linux/distributions ftp.demon.co.uk:/pub/linux/distributions src.doc.ic.ac.uk:/packages/linux/distributions For simplicity, let's concentrate on Slackware here. This distribution consists of a number of subdirectories, containing separate packages. Normally, they're controlled by an install program, but you can retrieve files "by hand" too. First of all, you will need to look in the "con- tents" subdir of the distribution. You will find a lot of small textfiles here describing the contents of the seperate packages. The fastest way to look something up is to retrieve all the files in the contents subdirec- tory, and grep through them for the file you need. Here is an example of a list of files that you might need, and in which contents-file you will find it by grepping through them: Needed Package ld.so ldso ldconfig ldso ldd ldso libc.so.4 shlibs libX11.so.6.0 xf lib - libXt.so.6.0 xf lib - libX11.so.3 oldlibs libXt.so.3 oldlibs So, in this case, you will need the packages ldso, shlibs, xf lib and - oldlibs. In each of the contents-files for these packages, look for a line saying "PACKAGE LOCATION", it will tell you on which 'disk' the package is, in our case it will tell us in which subdirectory we need to look. For our example, we would find the following locations: Package Location ldso diska2 shlibs diska2 oldlibs diskx6 xf lib diskx9 - The locations called "diskXX" refer to the "slakware/XX" subdirectories of the distribution, others may be found in the "contrib" subdirectory. In this case, we could now retrieve the packages we need by retrieving the following files (relative to the root of the Slackware distribution tree): slakware/a2/ldso.tgz slakware/a2/shlibs.tgz slakware/x6/oldlibs/tgz slakware/x9/xf lib.tgz - Extract the files from these gzipped tarfiles in your /compat/linux di- rectory (possibly omitting or afterwards removing files you don't need), and you are done. BUGS The information about Linux distributions may become outdated. SEE ALSO ftp.freebsd.org:pub/FreeBSD/2.0.5-RELEASE/xperimnt/linux-emu/README /usr/src/sys/i386/ibcs2/README.iBCS2 4th Berkeley Distribution March 2, 1995 5
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