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  1 config BINFMT_ELF
  2         bool "Kernel support for ELF binaries"
  3         depends on MMU && (BROKEN || !FRV)
  4         select ELFCORE
  5         default y
  6         ---help---
  7           ELF (Executable and Linkable Format) is a format for libraries and
  8           executables used across different architectures and operating
  9           systems. Saying Y here will enable your kernel to run ELF binaries
 10           and enlarge it by about 13 KB. ELF support under Linux has now all
 11           but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
 12           because it is portable (this does *not* mean that you will be able
 13           to run executables from different architectures or operating systems
 14           however) and makes building run-time libraries very easy. Many new
 15           executables are distributed solely in ELF format. You definitely
 16           want to say Y here.
 18           Information about ELF is contained in the ELF HOWTO available from
 19           <>.
 21           If you find that after upgrading from Linux kernel 1.2 and saying Y
 22           here, you still can't run any ELF binaries (they just crash), then
 23           you'll have to install the newest ELF runtime libraries, including
 24  (check the file <file:Documentation/Changes> for location and
 25           latest version).
 28         bool
 29         depends on COMPAT && BINFMT_ELF
 30         select ELFCORE
 33         bool
 36         bool "Kernel support for FDPIC ELF binaries"
 37         default y
 38         depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
 39         select ELFCORE
 40         help
 41           ELF FDPIC binaries are based on ELF, but allow the individual load
 42           segments of a binary to be located in memory independently of each
 43           other. This makes this format ideal for use in environments where no
 44           MMU is available as it still permits text segments to be shared,
 45           even if data segments are not.
 47           It is also possible to run FDPIC ELF binaries on MMU linux also.
 49 config ELFCORE
 50         bool
 51         help
 52           This option enables kernel/elfcore.o.
 55         bool "Write ELF core dumps with partial segments"
 56         default y
 57         depends on BINFMT_ELF && ELF_CORE
 58         help
 59           ELF core dump files describe each memory mapping of the crashed
 60           process, and can contain or omit the memory contents of each one.
 61           The contents of an unmodified text mapping are omitted by default.
 63           For an unmodified text mapping of an ELF object, including just
 64           the first page of the file in a core dump makes it possible to
 65           identify the build ID bits in the file, without paying the i/o
 66           cost and disk space to dump all the text.  However, versions of
 67           GDB before 6.7 are confused by ELF core dump files in this format.
 69           The core dump behavior can be controlled per process using
 70           the /proc/PID/coredump_filter pseudo-file; this setting is
 71           inherited.  See Documentation/filesystems/proc.txt for details.
 73           This config option changes the default setting of coredump_filter
 74           seen at boot time.  If unsure, say Y.
 76 config BINFMT_SCRIPT
 77         tristate "Kernel support for scripts starting with #!"
 78         default y
 79         help
 80           Say Y here if you want to execute interpreted scripts starting with
 81           #! followed by the path to an interpreter.
 83           You can build this support as a module; however, until that module
 84           gets loaded, you cannot run scripts.  Thus, if you want to load this
 85           module from an initramfs, the portion of the initramfs before loading
 86           this module must consist of compiled binaries only.
 88           Most systems will not boot if you say M or N here.  If unsure, say Y.
 90 config BINFMT_FLAT
 91         bool "Kernel support for flat binaries"
 92         depends on !MMU || ARM || M68K
 93         depends on !FRV || BROKEN
 94         help
 95           Support uClinux FLAT format binaries.
 97 config BINFMT_ZFLAT
 98         bool "Enable ZFLAT support"
 99         depends on BINFMT_FLAT
100         select ZLIB_INFLATE
101         help
102           Support FLAT format compressed binaries
105         bool "Enable shared FLAT support"
106         depends on BINFMT_FLAT
107         help
108           Support FLAT shared libraries
110 config HAVE_AOUT
111        def_bool n
113 config BINFMT_AOUT
114         tristate "Kernel support for a.out and ECOFF binaries"
115         depends on HAVE_AOUT
116         ---help---
117           A.out (Assembler.OUTput) is a set of formats for libraries and
118           executables used in the earliest versions of UNIX.  Linux used
119           the a.out formats QMAGIC and ZMAGIC until they were replaced
120           with the ELF format.
122           The conversion to ELF started in 1995.  This option is primarily
123           provided for historical interest and for the benefit of those
124           who need to run binaries from that era.
126           Most people should answer N here.  If you think you may have
127           occasional use for this format, enable module support above
128           and answer M here to compile this support as a module called
129           binfmt_aout.
131           If any crucial components of your system (such as /sbin/init
132           or /lib/ are still in a.out format, you will have to
133           say Y here.
135 config OSF4_COMPAT
136         bool "OSF/1 v4 readv/writev compatibility"
137         depends on ALPHA && BINFMT_AOUT
138         help
139           Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
140           with v4 shared libraries freely available from Compaq. If you're
141           going to use shared libraries from Tru64 version 5.0 or later, say N.
143 config BINFMT_EM86
144         tristate "Kernel support for Linux/Intel ELF binaries"
145         depends on ALPHA
146         ---help---
147           Say Y here if you want to be able to execute Linux/Intel ELF
148           binaries just like native Alpha binaries on your Alpha machine. For
149           this to work, you need to have the emulator /usr/bin/em86 in place.
151           You can get the same functionality by saying N here and saying Y to
152           "Kernel support for MISC binaries".
154           You may answer M to compile the emulation support as a module and
155           later load the module when you want to use a Linux/Intel binary. The
156           module will be called binfmt_em86. If unsure, say Y.
158 config BINFMT_MISC
159         tristate "Kernel support for MISC binaries"
160         ---help---
161           If you say Y here, it will be possible to plug wrapper-driven binary
162           formats into the kernel. You will like this especially when you use
163           programs that need an interpreter to run like Java, Python, .NET or
164           Emacs-Lisp. It's also useful if you often run DOS executables under
165           the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
166           <>). Once you have
167           registered such a binary class with the kernel, you can start one of
168           those programs simply by typing in its name at a shell prompt; Linux
169           will automatically feed it to the correct interpreter.
171           You can do other nice things, too. Read the file
172           <file:Documentation/binfmt_misc.txt> to learn how to use this
173           feature, <file:Documentation/admin-guide/java.rst> for information about how
174           to include Java support. and <file:Documentation/admin-guide/mono.rst> for
175           information about how to include Mono-based .NET support.
177           To use binfmt_misc, you will need to mount it:
178                 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
180           You may say M here for module support and later load the module when
181           you have use for it; the module is called binfmt_misc. If you
182           don't know what to answer at this point, say Y.
184 config COREDUMP
185         bool "Enable core dump support" if EXPERT
186         default y
187         help
188           This option enables support for performing core dumps. You almost
189           certainly want to say Y here. Not necessary on systems that never
190           need debugging or only ever run flawless code.

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