| # SPDX-License-Identifier: GPL-2.0-only |
| |
| menu "Executable file formats" |
| |
| config BINFMT_ELF |
| bool "Kernel support for ELF binaries" |
| depends on MMU |
| select ELFCORE |
| default y |
| ---help--- |
| ELF (Executable and Linkable Format) is a format for libraries and |
| executables used across different architectures and operating |
| systems. Saying Y here will enable your kernel to run ELF binaries |
| and enlarge it by about 13 KB. ELF support under Linux has now all |
| but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC) |
| because it is portable (this does *not* mean that you will be able |
| to run executables from different architectures or operating systems |
| however) and makes building run-time libraries very easy. Many new |
| executables are distributed solely in ELF format. You definitely |
| want to say Y here. |
| |
| Information about ELF is contained in the ELF HOWTO available from |
| <http://www.tldp.org/docs.html#howto>. |
| |
| If you find that after upgrading from Linux kernel 1.2 and saying Y |
| here, you still can't run any ELF binaries (they just crash), then |
| you'll have to install the newest ELF runtime libraries, including |
| ld.so (check the file <file:Documentation/Changes> for location and |
| latest version). |
| |
| config COMPAT_BINFMT_ELF |
| bool |
| depends on COMPAT && BINFMT_ELF |
| select ELFCORE |
| |
| config ARCH_BINFMT_ELF_STATE |
| bool |
| |
| config BINFMT_ELF_FDPIC |
| bool "Kernel support for FDPIC ELF binaries" |
| default y if !BINFMT_ELF |
| depends on (ARM || (SUPERH32 && !MMU) || C6X) |
| select ELFCORE |
| help |
| ELF FDPIC binaries are based on ELF, but allow the individual load |
| segments of a binary to be located in memory independently of each |
| other. This makes this format ideal for use in environments where no |
| MMU is available as it still permits text segments to be shared, |
| even if data segments are not. |
| |
| It is also possible to run FDPIC ELF binaries on MMU linux also. |
| |
| config ELFCORE |
| bool |
| help |
| This option enables kernel/elfcore.o. |
| |
| config CORE_DUMP_DEFAULT_ELF_HEADERS |
| bool "Write ELF core dumps with partial segments" |
| default y |
| depends on BINFMT_ELF && ELF_CORE |
| help |
| ELF core dump files describe each memory mapping of the crashed |
| process, and can contain or omit the memory contents of each one. |
| The contents of an unmodified text mapping are omitted by default. |
| |
| For an unmodified text mapping of an ELF object, including just |
| the first page of the file in a core dump makes it possible to |
| identify the build ID bits in the file, without paying the i/o |
| cost and disk space to dump all the text. However, versions of |
| GDB before 6.7 are confused by ELF core dump files in this format. |
| |
| The core dump behavior can be controlled per process using |
| the /proc/PID/coredump_filter pseudo-file; this setting is |
| inherited. See Documentation/filesystems/proc.txt for details. |
| |
| This config option changes the default setting of coredump_filter |
| seen at boot time. If unsure, say Y. |
| |
| config BINFMT_SCRIPT |
| tristate "Kernel support for scripts starting with #!" |
| default y |
| help |
| Say Y here if you want to execute interpreted scripts starting with |
| #! followed by the path to an interpreter. |
| |
| You can build this support as a module; however, until that module |
| gets loaded, you cannot run scripts. Thus, if you want to load this |
| module from an initramfs, the portion of the initramfs before loading |
| this module must consist of compiled binaries only. |
| |
| Most systems will not boot if you say M or N here. If unsure, say Y. |
| |
| config BINFMT_FLAT |
| bool "Kernel support for flat binaries" |
| depends on !MMU || ARM || M68K |
| help |
| Support uClinux FLAT format binaries. |
| |
| config BINFMT_FLAT_OLD_ALWAYS_RAM |
| bool |
| |
| config BINFMT_ZFLAT |
| bool "Enable ZFLAT support" |
| depends on BINFMT_FLAT |
| select ZLIB_INFLATE |
| help |
| Support FLAT format compressed binaries |
| |
| config BINFMT_SHARED_FLAT |
| bool "Enable shared FLAT support" |
| depends on BINFMT_FLAT |
| help |
| Support FLAT shared libraries |
| |
| config HAVE_AOUT |
| def_bool n |
| |
| config BINFMT_AOUT |
| tristate "Kernel support for a.out and ECOFF binaries" |
| depends on HAVE_AOUT |
| ---help--- |
| A.out (Assembler.OUTput) is a set of formats for libraries and |
| executables used in the earliest versions of UNIX. Linux used |
| the a.out formats QMAGIC and ZMAGIC until they were replaced |
| with the ELF format. |
| |
| The conversion to ELF started in 1995. This option is primarily |
| provided for historical interest and for the benefit of those |
| who need to run binaries from that era. |
| |
| Most people should answer N here. If you think you may have |
| occasional use for this format, enable module support above |
| and answer M here to compile this support as a module called |
| binfmt_aout. |
| |
| If any crucial components of your system (such as /sbin/init |
| or /lib/ld.so) are still in a.out format, you will have to |
| say Y here. |
| |
| config OSF4_COMPAT |
| bool "OSF/1 v4 readv/writev compatibility" |
| depends on ALPHA && BINFMT_AOUT |
| help |
| Say Y if you are using OSF/1 binaries (like Netscape and Acrobat) |
| with v4 shared libraries freely available from Compaq. If you're |
| going to use shared libraries from Tru64 version 5.0 or later, say N. |
| |
| config BINFMT_EM86 |
| tristate "Kernel support for Linux/Intel ELF binaries" |
| depends on ALPHA |
| ---help--- |
| Say Y here if you want to be able to execute Linux/Intel ELF |
| binaries just like native Alpha binaries on your Alpha machine. For |
| this to work, you need to have the emulator /usr/bin/em86 in place. |
| |
| You can get the same functionality by saying N here and saying Y to |
| "Kernel support for MISC binaries". |
| |
| You may answer M to compile the emulation support as a module and |
| later load the module when you want to use a Linux/Intel binary. The |
| module will be called binfmt_em86. If unsure, say Y. |
| |
| config BINFMT_MISC |
| tristate "Kernel support for MISC binaries" |
| ---help--- |
| If you say Y here, it will be possible to plug wrapper-driven binary |
| formats into the kernel. You will like this especially when you use |
| programs that need an interpreter to run like Java, Python, .NET or |
| Emacs-Lisp. It's also useful if you often run DOS executables under |
| the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from |
| <http://www.tldp.org/docs.html#howto>). Once you have |
| registered such a binary class with the kernel, you can start one of |
| those programs simply by typing in its name at a shell prompt; Linux |
| will automatically feed it to the correct interpreter. |
| |
| You can do other nice things, too. Read the file |
| <file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this |
| feature, <file:Documentation/admin-guide/java.rst> for information about how |
| to include Java support. and <file:Documentation/admin-guide/mono.rst> for |
| information about how to include Mono-based .NET support. |
| |
| To use binfmt_misc, you will need to mount it: |
| mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc |
| |
| You may say M here for module support and later load the module when |
| you have use for it; the module is called binfmt_misc. If you |
| don't know what to answer at this point, say Y. |
| |
| config COREDUMP |
| bool "Enable core dump support" if EXPERT |
| default y |
| help |
| This option enables support for performing core dumps. You almost |
| certainly want to say Y here. Not necessary on systems that never |
| need debugging or only ever run flawless code. |
| |
| endmenu |
