0001 config BINFMT_ELF
0002 bool "Kernel support for ELF binaries"
0003 depends on MMU && (BROKEN || !FRV)
0004 select ELFCORE
0005 default y
0007 ELF (Executable and Linkable Format) is a format for libraries and
0008 executables used across different architectures and operating
0009 systems. Saying Y here will enable your kernel to run ELF binaries
0010 and enlarge it by about 13 KB. ELF support under Linux has now all
0011 but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
0012 because it is portable (this does *not* mean that you will be able
0013 to run executables from different architectures or operating systems
0014 however) and makes building run-time libraries very easy. Many new
0015 executables are distributed solely in ELF format. You definitely
0016 want to say Y here.
0018 Information about ELF is contained in the ELF HOWTO available from
0021 If you find that after upgrading from Linux kernel 1.2 and saying Y
0022 here, you still can't run any ELF binaries (they just crash), then
0023 you'll have to install the newest ELF runtime libraries, including
0024 ld.so (check the file <file:Documentation/Changes> for location and
0025 latest version).
0027 config COMPAT_BINFMT_ELF
0029 depends on COMPAT && BINFMT_ELF
0030 select ELFCORE
0032 config ARCH_BINFMT_ELF_STATE
0035 config BINFMT_ELF_FDPIC
0036 bool "Kernel support for FDPIC ELF binaries"
0037 default y
0038 depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
0039 select ELFCORE
0041 ELF FDPIC binaries are based on ELF, but allow the individual load
0042 segments of a binary to be located in memory independently of each
0043 other. This makes this format ideal for use in environments where no
0044 MMU is available as it still permits text segments to be shared,
0045 even if data segments are not.
0047 It is also possible to run FDPIC ELF binaries on MMU linux also.
0049 config ELFCORE
0052 This option enables kernel/elfcore.o.
0054 config CORE_DUMP_DEFAULT_ELF_HEADERS
0055 bool "Write ELF core dumps with partial segments"
0056 default y
0057 depends on BINFMT_ELF && ELF_CORE
0059 ELF core dump files describe each memory mapping of the crashed
0060 process, and can contain or omit the memory contents of each one.
0061 The contents of an unmodified text mapping are omitted by default.
0063 For an unmodified text mapping of an ELF object, including just
0064 the first page of the file in a core dump makes it possible to
0065 identify the build ID bits in the file, without paying the i/o
0066 cost and disk space to dump all the text. However, versions of
0067 GDB before 6.7 are confused by ELF core dump files in this format.
0069 The core dump behavior can be controlled per process using
0070 the /proc/PID/coredump_filter pseudo-file; this setting is
0071 inherited. See Documentation/filesystems/proc.txt for details.
0073 This config option changes the default setting of coredump_filter
0074 seen at boot time. If unsure, say Y.
0076 config BINFMT_SCRIPT
0077 tristate "Kernel support for scripts starting with #!"
0078 default y
0080 Say Y here if you want to execute interpreted scripts starting with
0081 #! followed by the path to an interpreter.
0083 You can build this support as a module; however, until that module
0084 gets loaded, you cannot run scripts. Thus, if you want to load this
0085 module from an initramfs, the portion of the initramfs before loading
0086 this module must consist of compiled binaries only.
0088 Most systems will not boot if you say M or N here. If unsure, say Y.
0090 config BINFMT_FLAT
0091 bool "Kernel support for flat binaries"
0092 depends on !MMU || ARM || M68K
0093 depends on !FRV || BROKEN
0095 Support uClinux FLAT format binaries.
0097 config BINFMT_ZFLAT
0098 bool "Enable ZFLAT support"
0099 depends on BINFMT_FLAT
0100 select ZLIB_INFLATE
0102 Support FLAT format compressed binaries
0104 config BINFMT_SHARED_FLAT
0105 bool "Enable shared FLAT support"
0106 depends on BINFMT_FLAT
0108 Support FLAT shared libraries
0110 config HAVE_AOUT
0111 def_bool n
0113 config BINFMT_AOUT
0114 tristate "Kernel support for a.out and ECOFF binaries"
0115 depends on HAVE_AOUT
0117 A.out (Assembler.OUTput) is a set of formats for libraries and
0118 executables used in the earliest versions of UNIX. Linux used
0119 the a.out formats QMAGIC and ZMAGIC until they were replaced
0120 with the ELF format.
0122 The conversion to ELF started in 1995. This option is primarily
0123 provided for historical interest and for the benefit of those
0124 who need to run binaries from that era.
0126 Most people should answer N here. If you think you may have
0127 occasional use for this format, enable module support above
0128 and answer M here to compile this support as a module called
0131 If any crucial components of your system (such as /sbin/init
0132 or /lib/ld.so) are still in a.out format, you will have to
0133 say Y here.
0135 config OSF4_COMPAT
0136 bool "OSF/1 v4 readv/writev compatibility"
0137 depends on ALPHA && BINFMT_AOUT
0139 Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
0140 with v4 shared libraries freely available from Compaq. If you're
0141 going to use shared libraries from Tru64 version 5.0 or later, say N.
0143 config BINFMT_EM86
0144 tristate "Kernel support for Linux/Intel ELF binaries"
0145 depends on ALPHA
0147 Say Y here if you want to be able to execute Linux/Intel ELF
0148 binaries just like native Alpha binaries on your Alpha machine. For
0149 this to work, you need to have the emulator /usr/bin/em86 in place.
0151 You can get the same functionality by saying N here and saying Y to
0152 "Kernel support for MISC binaries".
0154 You may answer M to compile the emulation support as a module and
0155 later load the module when you want to use a Linux/Intel binary. The
0156 module will be called binfmt_em86. If unsure, say Y.
0158 config BINFMT_MISC
0159 tristate "Kernel support for MISC binaries"
0161 If you say Y here, it will be possible to plug wrapper-driven binary
0162 formats into the kernel. You will like this especially when you use
0163 programs that need an interpreter to run like Java, Python, .NET or
0164 Emacs-Lisp. It's also useful if you often run DOS executables under
0165 the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
0166 <http://www.tldp.org/docs.html#howto>). Once you have
0167 registered such a binary class with the kernel, you can start one of
0168 those programs simply by typing in its name at a shell prompt; Linux
0169 will automatically feed it to the correct interpreter.
0171 You can do other nice things, too. Read the file
0172 <file:Documentation/binfmt_misc.txt> to learn how to use this
0173 feature, <file:Documentation/admin-guide/java.rst> for information about how
0174 to include Java support. and <file:Documentation/admin-guide/mono.rst> for
0175 information about how to include Mono-based .NET support.
0177 To use binfmt_misc, you will need to mount it:
0178 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
0180 You may say M here for module support and later load the module when
0181 you have use for it; the module is called binfmt_misc. If you
0182 don't know what to answer at this point, say Y.
0184 config COREDUMP
0185 bool "Enable core dump support" if EXPERT
0186 default y
0188 This option enables support for performing core dumps. You almost
0189 certainly want to say Y here. Not necessary on systems that never
0190 need debugging or only ever run flawless code.