fs/Kconfig.binfmt

   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.