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/fs/Kconfig.binfmt

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    1 config BINFMT_ELF
    2         bool "Kernel support for ELF binaries"
    3         depends on MMU && (BROKEN || !FRV)
    4         default y
    5         ---help---
    6           ELF (Executable and Linkable Format) is a format for libraries and
    7           executables used across different architectures and operating
    8           systems. Saying Y here will enable your kernel to run ELF binaries
    9           and enlarge it by about 13 KB. ELF support under Linux has now all
   10           but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
   11           because it is portable (this does *not* mean that you will be able
   12           to run executables from different architectures or operating systems
   13           however) and makes building run-time libraries very easy. Many new
   14           executables are distributed solely in ELF format. You definitely
   15           want to say Y here.
   16 
   17           Information about ELF is contained in the ELF HOWTO available from
   18           <http://www.tldp.org/docs.html#howto>.
   19 
   20           If you find that after upgrading from Linux kernel 1.2 and saying Y
   21           here, you still can't run any ELF binaries (they just crash), then
   22           you'll have to install the newest ELF runtime libraries, including
   23           ld.so (check the file <file:Documentation/Changes> for location and
   24           latest version).
   25 
   26 config COMPAT_BINFMT_ELF
   27         bool
   28         depends on COMPAT && BINFMT_ELF
   29 
   30 config ARCH_BINFMT_ELF_RANDOMIZE_PIE
   31         bool
   32 
   33 config BINFMT_ELF_FDPIC
   34         bool "Kernel support for FDPIC ELF binaries"
   35         default y
   36         depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
   37         help
   38           ELF FDPIC binaries are based on ELF, but allow the individual load
   39           segments of a binary to be located in memory independently of each
   40           other. This makes this format ideal for use in environments where no
   41           MMU is available as it still permits text segments to be shared,
   42           even if data segments are not.
   43 
   44           It is also possible to run FDPIC ELF binaries on MMU linux also.
   45 
   46 config CORE_DUMP_DEFAULT_ELF_HEADERS
   47         bool "Write ELF core dumps with partial segments"
   48         default y
   49         depends on BINFMT_ELF && ELF_CORE
   50         help
   51           ELF core dump files describe each memory mapping of the crashed
   52           process, and can contain or omit the memory contents of each one.
   53           The contents of an unmodified text mapping are omitted by default.
   54 
   55           For an unmodified text mapping of an ELF object, including just
   56           the first page of the file in a core dump makes it possible to
   57           identify the build ID bits in the file, without paying the i/o
   58           cost and disk space to dump all the text.  However, versions of
   59           GDB before 6.7 are confused by ELF core dump files in this format.
   60 
   61           The core dump behavior can be controlled per process using
   62           the /proc/PID/coredump_filter pseudo-file; this setting is
   63           inherited.  See Documentation/filesystems/proc.txt for details.
   64 
   65           This config option changes the default setting of coredump_filter
   66           seen at boot time.  If unsure, say Y.
   67 
   68 config BINFMT_FLAT
   69         bool "Kernel support for flat binaries"
   70         depends on !MMU && (!FRV || BROKEN)
   71         help
   72           Support uClinux FLAT format binaries.
   73 
   74 config BINFMT_ZFLAT
   75         bool "Enable ZFLAT support"
   76         depends on BINFMT_FLAT
   77         select ZLIB_INFLATE
   78         help
   79           Support FLAT format compressed binaries
   80 
   81 config BINFMT_SHARED_FLAT
   82         bool "Enable shared FLAT support"
   83         depends on BINFMT_FLAT
   84         help
   85           Support FLAT shared libraries
   86 
   87 config HAVE_AOUT
   88        def_bool n
   89 
   90 config BINFMT_AOUT
   91         tristate "Kernel support for a.out and ECOFF binaries"
   92         depends on HAVE_AOUT
   93         ---help---
   94           A.out (Assembler.OUTput) is a set of formats for libraries and
   95           executables used in the earliest versions of UNIX.  Linux used
   96           the a.out formats QMAGIC and ZMAGIC until they were replaced
   97           with the ELF format.
   98 
   99           The conversion to ELF started in 1995.  This option is primarily
  100           provided for historical interest and for the benefit of those
  101           who need to run binaries from that era.
  102 
  103           Most people should answer N here.  If you think you may have
  104           occasional use for this format, enable module support above
  105           and answer M here to compile this support as a module called
  106           binfmt_aout.
  107 
  108           If any crucial components of your system (such as /sbin/init
  109           or /lib/ld.so) are still in a.out format, you will have to
  110           say Y here.
  111 
  112 config OSF4_COMPAT
  113         bool "OSF/1 v4 readv/writev compatibility"
  114         depends on ALPHA && BINFMT_AOUT
  115         help
  116           Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
  117           with v4 shared libraries freely available from Compaq. If you're
  118           going to use shared libraries from Tru64 version 5.0 or later, say N.
  119 
  120 config BINFMT_EM86
  121         tristate "Kernel support for Linux/Intel ELF binaries"
  122         depends on ALPHA
  123         ---help---
  124           Say Y here if you want to be able to execute Linux/Intel ELF
  125           binaries just like native Alpha binaries on your Alpha machine. For
  126           this to work, you need to have the emulator /usr/bin/em86 in place.
  127 
  128           You can get the same functionality by saying N here and saying Y to
  129           "Kernel support for MISC binaries".
  130 
  131           You may answer M to compile the emulation support as a module and
  132           later load the module when you want to use a Linux/Intel binary. The
  133           module will be called binfmt_em86. If unsure, say Y.
  134 
  135 config BINFMT_SOM
  136         tristate "Kernel support for SOM binaries"
  137         depends on PARISC && HPUX
  138         help
  139           SOM is a binary executable format inherited from HP/UX.  Say
  140           Y here to be able to load and execute SOM binaries directly.
  141 
  142 config BINFMT_MISC
  143         tristate "Kernel support for MISC binaries"
  144         ---help---
  145           If you say Y here, it will be possible to plug wrapper-driven binary
  146           formats into the kernel. You will like this especially when you use
  147           programs that need an interpreter to run like Java, Python, .NET or
  148           Emacs-Lisp. It's also useful if you often run DOS executables under
  149           the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
  150           <http://www.tldp.org/docs.html#howto>). Once you have
  151           registered such a binary class with the kernel, you can start one of
  152           those programs simply by typing in its name at a shell prompt; Linux
  153           will automatically feed it to the correct interpreter.
  154 
  155           You can do other nice things, too. Read the file
  156           <file:Documentation/binfmt_misc.txt> to learn how to use this
  157           feature, <file:Documentation/java.txt> for information about how
  158           to include Java support. and <file:Documentation/mono.txt> for
  159           information about how to include Mono-based .NET support.
  160 
  161           To use binfmt_misc, you will need to mount it:
  162                 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
  163 
  164           You may say M here for module support and later load the module when
  165           you have use for it; the module is called binfmt_misc. If you
  166           don't know what to answer at this point, say Y.
  167 
  168 config COREDUMP
  169         bool "Enable core dump support" if EXPERT
  170         default y
  171         help
  172           This option enables support for performing core dumps. You almost
  173           certainly want to say Y here. Not necessary on systems that never
  174           need debugging or only ever run flawless code.

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