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_STATE
  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_SCRIPT
  69         tristate "Kernel support for scripts starting with #!"
  70         default y
  71         help
  72           Say Y here if you want to execute interpreted scripts starting with
  73           #! followed by the path to an interpreter.
  74
  75           You can build this support as a module; however, until that module
  76           gets loaded, you cannot run scripts.  Thus, if you want to load this
  77           module from an initramfs, the portion of the initramfs before loading
  78           this module must consist of compiled binaries only.
  79
  80           Most systems will not boot if you say M or N here.  If unsure, say Y.
  81
  82 config BINFMT_FLAT
  83         bool "Kernel support for flat binaries"
  84         depends on !MMU && (!FRV || BROKEN)
  85         help
  86           Support uClinux FLAT format binaries.
  87
  88 config BINFMT_ZFLAT
  89         bool "Enable ZFLAT support"
  90         depends on BINFMT_FLAT
  91         select ZLIB_INFLATE
  92         help
  93           Support FLAT format compressed binaries
  94
  95 config BINFMT_SHARED_FLAT
  96         bool "Enable shared FLAT support"
  97         depends on BINFMT_FLAT
  98         help
  99           Support FLAT shared libraries
 100
 101 config HAVE_AOUT
 102        def_bool n
 103
 104 config BINFMT_AOUT
 105         tristate "Kernel support for a.out and ECOFF binaries"
 106         depends on HAVE_AOUT
 107         ---help---
 108           A.out (Assembler.OUTput) is a set of formats for libraries and
 109           executables used in the earliest versions of UNIX.  Linux used
 110           the a.out formats QMAGIC and ZMAGIC until they were replaced
 111           with the ELF format.
 112
 113           The conversion to ELF started in 1995.  This option is primarily
 114           provided for historical interest and for the benefit of those
 115           who need to run binaries from that era.
 116
 117           Most people should answer N here.  If you think you may have
 118           occasional use for this format, enable module support above
 119           and answer M here to compile this support as a module called
 120           binfmt_aout.
 121
 122           If any crucial components of your system (such as /sbin/init
 123           or /lib/ld.so) are still in a.out format, you will have to
 124           say Y here.
 125
 126 config OSF4_COMPAT
 127         bool "OSF/1 v4 readv/writev compatibility"
 128         depends on ALPHA && BINFMT_AOUT
 129         help
 130           Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
 131           with v4 shared libraries freely available from Compaq. If you're
 132           going to use shared libraries from Tru64 version 5.0 or later, say N.
 133
 134 config BINFMT_EM86
 135         tristate "Kernel support for Linux/Intel ELF binaries"
 136         depends on ALPHA
 137         ---help---
 138           Say Y here if you want to be able to execute Linux/Intel ELF
 139           binaries just like native Alpha binaries on your Alpha machine. For
 140           this to work, you need to have the emulator /usr/bin/em86 in place.
 141
 142           You can get the same functionality by saying N here and saying Y to
 143           "Kernel support for MISC binaries".
 144
 145           You may answer M to compile the emulation support as a module and
 146           later load the module when you want to use a Linux/Intel binary. The
 147           module will be called binfmt_em86. If unsure, say Y.
 148
 149 config BINFMT_MISC
 150         tristate "Kernel support for MISC binaries"
 151         ---help---
 152           If you say Y here, it will be possible to plug wrapper-driven binary
 153           formats into the kernel. You will like this especially when you use
 154           programs that need an interpreter to run like Java, Python, .NET or
 155           Emacs-Lisp. It's also useful if you often run DOS executables under
 156           the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
 157           <http://www.tldp.org/docs.html#howto>). Once you have
 158           registered such a binary class with the kernel, you can start one of
 159           those programs simply by typing in its name at a shell prompt; Linux
 160           will automatically feed it to the correct interpreter.
 161
 162           You can do other nice things, too. Read the file
 163           <file:Documentation/binfmt_misc.txt> to learn how to use this
 164           feature, <file:Documentation/java.txt> for information about how
 165           to include Java support. and <file:Documentation/mono.txt> for
 166           information about how to include Mono-based .NET support.
 167
 168           To use binfmt_misc, you will need to mount it:
 169                 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
 170
 171           You may say M here for module support and later load the module when
 172           you have use for it; the module is called binfmt_misc. If you
 173           don't know what to answer at this point, say Y.
 174
 175 config COREDUMP
 176         bool "Enable core dump support" if EXPERT
 177         default y
 178         help
 179           This option enables support for performing core dumps. You almost
 180           certainly want to say Y here. Not necessary on systems that never
 181           need debugging or only ever run flawless code.