# SPDX-License-Identifier: GPL-2.0-only
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menu "Executable file formats"
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config BINFMT_ELF
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bool "Kernel support for ELF binaries"
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depends on MMU
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select ELFCORE
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default y
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help
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ELF (Executable and Linkable Format) is a format for libraries and
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executables used across different architectures and operating
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systems. Saying Y here will enable your kernel to run ELF binaries
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and enlarge it by about 13 KB. ELF support under Linux has now all
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but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
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because it is portable (this does *not* mean that you will be able
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to run executables from different architectures or operating systems
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however) and makes building run-time libraries very easy. Many new
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executables are distributed solely in ELF format. You definitely
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want to say Y here.
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Information about ELF is contained in the ELF HOWTO available from
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<http://www.tldp.org/docs.html#howto>.
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If you find that after upgrading from Linux kernel 1.2 and saying Y
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here, you still can't run any ELF binaries (they just crash), then
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you'll have to install the newest ELF runtime libraries, including
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ld.so (check the file <file:Documentation/Changes> for location and
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latest version).
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config COMPAT_BINFMT_ELF
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bool
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depends on COMPAT && BINFMT_ELF
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select ELFCORE
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config ARCH_BINFMT_ELF_STATE
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bool
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config ARCH_HAVE_ELF_PROT
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bool
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config ARCH_USE_GNU_PROPERTY
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bool
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config BINFMT_ELF_FDPIC
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bool "Kernel support for FDPIC ELF binaries"
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default y if !BINFMT_ELF
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depends on (ARM || (SUPERH && !MMU) || C6X)
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select ELFCORE
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help
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ELF FDPIC binaries are based on ELF, but allow the individual load
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segments of a binary to be located in memory independently of each
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other. This makes this format ideal for use in environments where no
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MMU is available as it still permits text segments to be shared,
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even if data segments are not.
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It is also possible to run FDPIC ELF binaries on MMU linux also.
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config ELFCORE
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bool
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help
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This option enables kernel/elfcore.o.
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config CORE_DUMP_DEFAULT_ELF_HEADERS
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bool "Write ELF core dumps with partial segments"
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default y
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depends on BINFMT_ELF && ELF_CORE
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help
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ELF core dump files describe each memory mapping of the crashed
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process, and can contain or omit the memory contents of each one.
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The contents of an unmodified text mapping are omitted by default.
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For an unmodified text mapping of an ELF object, including just
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the first page of the file in a core dump makes it possible to
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identify the build ID bits in the file, without paying the i/o
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cost and disk space to dump all the text. However, versions of
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GDB before 6.7 are confused by ELF core dump files in this format.
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The core dump behavior can be controlled per process using
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the /proc/PID/coredump_filter pseudo-file; this setting is
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inherited. See Documentation/filesystems/proc.rst for details.
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This config option changes the default setting of coredump_filter
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seen at boot time. If unsure, say Y.
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config BINFMT_SCRIPT
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tristate "Kernel support for scripts starting with #!"
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default y
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help
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Say Y here if you want to execute interpreted scripts starting with
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#! followed by the path to an interpreter.
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You can build this support as a module; however, until that module
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gets loaded, you cannot run scripts. Thus, if you want to load this
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module from an initramfs, the portion of the initramfs before loading
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this module must consist of compiled binaries only.
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Most systems will not boot if you say M or N here. If unsure, say Y.
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config ARCH_HAS_BINFMT_FLAT
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bool
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config BINFMT_FLAT
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bool "Kernel support for flat binaries"
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depends on ARCH_HAS_BINFMT_FLAT
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help
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Support uClinux FLAT format binaries.
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config BINFMT_FLAT_ARGVP_ENVP_ON_STACK
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bool
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config BINFMT_FLAT_OLD_ALWAYS_RAM
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bool
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config BINFMT_FLAT_OLD
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bool "Enable support for very old legacy flat binaries"
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depends on BINFMT_FLAT
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help
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Support decade old uClinux FLAT format binaries. Unless you know
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you have some of those say N here.
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config BINFMT_ZFLAT
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bool "Enable ZFLAT support"
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depends on BINFMT_FLAT
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select ZLIB_INFLATE
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help
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Support FLAT format compressed binaries
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config BINFMT_SHARED_FLAT
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bool "Enable shared FLAT support"
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depends on BINFMT_FLAT
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help
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Support FLAT shared libraries
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config HAVE_AOUT
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def_bool n
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config BINFMT_AOUT
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tristate "Kernel support for a.out and ECOFF binaries"
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depends on HAVE_AOUT
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help
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A.out (Assembler.OUTput) is a set of formats for libraries and
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executables used in the earliest versions of UNIX. Linux used
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the a.out formats QMAGIC and ZMAGIC until they were replaced
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with the ELF format.
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The conversion to ELF started in 1995. This option is primarily
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provided for historical interest and for the benefit of those
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who need to run binaries from that era.
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Most people should answer N here. If you think you may have
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occasional use for this format, enable module support above
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and answer M here to compile this support as a module called
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binfmt_aout.
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If any crucial components of your system (such as /sbin/init
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or /lib/ld.so) are still in a.out format, you will have to
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say Y here.
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config OSF4_COMPAT
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bool "OSF/1 v4 readv/writev compatibility"
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depends on ALPHA && BINFMT_AOUT
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help
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Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
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with v4 shared libraries freely available from Compaq. If you're
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going to use shared libraries from Tru64 version 5.0 or later, say N.
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config BINFMT_EM86
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tristate "Kernel support for Linux/Intel ELF binaries"
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depends on ALPHA
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help
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Say Y here if you want to be able to execute Linux/Intel ELF
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binaries just like native Alpha binaries on your Alpha machine. For
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this to work, you need to have the emulator /usr/bin/em86 in place.
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You can get the same functionality by saying N here and saying Y to
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"Kernel support for MISC binaries".
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You may answer M to compile the emulation support as a module and
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later load the module when you want to use a Linux/Intel binary. The
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module will be called binfmt_em86. If unsure, say Y.
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config BINFMT_MISC
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tristate "Kernel support for MISC binaries"
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help
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If you say Y here, it will be possible to plug wrapper-driven binary
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formats into the kernel. You will like this especially when you use
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programs that need an interpreter to run like Java, Python, .NET or
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Emacs-Lisp. It's also useful if you often run DOS executables under
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the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>). Once you have
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registered such a binary class with the kernel, you can start one of
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those programs simply by typing in its name at a shell prompt; Linux
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will automatically feed it to the correct interpreter.
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You can do other nice things, too. Read the file
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<file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this
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feature, <file:Documentation/admin-guide/java.rst> for information about how
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to include Java support. and <file:Documentation/admin-guide/mono.rst> for
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information about how to include Mono-based .NET support.
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To use binfmt_misc, you will need to mount it:
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mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
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You may say M here for module support and later load the module when
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you have use for it; the module is called binfmt_misc. If you
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don't know what to answer at this point, say Y.
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config COREDUMP
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bool "Enable core dump support" if EXPERT
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default y
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help
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This option enables support for performing core dumps. You almost
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certainly want to say Y here. Not necessary on systems that never
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need debugging or only ever run flawless code.
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endmenu
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