[mirror_ubuntu-eoan-kernel.git] / fs / Kconfig.binfmt


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_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
Commit	Line	Data
006477f4 CH	1
	2	menu "Executable file formats"
	3
1da177e4 LT	4	config BINFMT_ELF
1da177e4 LT	5	bool "Kernel support for ELF binaries"
a687a533	6	depends on MMU
f43edca7	7	select ELFCORE
1da177e4 LT	8	default y
	9	---help---
	10	ELF (Executable and Linkable Format) is a format for libraries and
	11	executables used across different architectures and operating
	12	systems. Saying Y here will enable your kernel to run ELF binaries
	13	and enlarge it by about 13 KB. ELF support under Linux has now all
	14	but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
	15	because it is portable (this does not mean that you will be able
	16	to run executables from different architectures or operating systems
	17	however) and makes building run-time libraries very easy. Many new
	18	executables are distributed solely in ELF format. You definitely
	19	want to say Y here.
	20
	21	Information about ELF is contained in the ELF HOWTO available from
	22	<http://www.tldp.org/docs.html#howto>.
	23
	24	If you find that after upgrading from Linux kernel 1.2 and saying Y
	25	here, you still can't run any ELF binaries (they just crash), then
	26	you'll have to install the newest ELF runtime libraries, including
	27	ld.so (check the file <file:Documentation/Changes> for location and
	28	latest version).
	29
b9d36d5d RM	30	config COMPAT_BINFMT_ELF
b9d36d5d RM	31	bool
4cea5ceb	32	depends on COMPAT && BINFMT_ELF
f43edca7	33	select ELFCORE
b9d36d5d	34
774c105e PB	35	config ARCH_BINFMT_ELF_STATE
	36	bool
	37
1da177e4 LT	38	config BINFMT_ELF_FDPIC
1da177e4 LT	39	bool "Kernel support for FDPIC ELF binaries"
382e67ae	40	default y if !BINFMT_ELF
a687a533	41	depends on (ARM \|\| (SUPERH32 && !MMU) \|\| C6X)
f43edca7	42	select ELFCORE
1da177e4 LT	43	help
	44	ELF FDPIC binaries are based on ELF, but allow the individual load
	45	segments of a binary to be located in memory independently of each
	46	other. This makes this format ideal for use in environments where no
	47	MMU is available as it still permits text segments to be shared,
	48	even if data segments are not.
	49
	50	It is also possible to run FDPIC ELF binaries on MMU linux also.
	51
f43edca7 RB	52	config ELFCORE
	53	bool
	54	help
	55	This option enables kernel/elfcore.o.
	56
656eb2cd RM	57	config CORE_DUMP_DEFAULT_ELF_HEADERS
656eb2cd RM	58	bool "Write ELF core dumps with partial segments"
89502155	59	default y
2d96d105	60	depends on BINFMT_ELF && ELF_CORE
656eb2cd RM	61	help
	62	ELF core dump files describe each memory mapping of the crashed
	63	process, and can contain or omit the memory contents of each one.
	64	The contents of an unmodified text mapping are omitted by default.
	65
	66	For an unmodified text mapping of an ELF object, including just
	67	the first page of the file in a core dump makes it possible to
	68	identify the build ID bits in the file, without paying the i/o
	69	cost and disk space to dump all the text. However, versions of
	70	GDB before 6.7 are confused by ELF core dump files in this format.
	71
	72	The core dump behavior can be controlled per process using
	73	the /proc/PID/coredump_filter pseudo-file; this setting is
	74	inherited. See Documentation/filesystems/proc.txt for details.
	75
	76	This config option changes the default setting of coredump_filter
89502155	77	seen at boot time. If unsure, say Y.
656eb2cd	78
2535e0d7 JT	79	config BINFMT_SCRIPT
	80	tristate "Kernel support for scripts starting with #!"
	81	default y
	82	help
	83	Say Y here if you want to execute interpreted scripts starting with
	84	#! followed by the path to an interpreter.
	85
	86	You can build this support as a module; however, until that module
	87	gets loaded, you cannot run scripts. Thus, if you want to load this
	88	module from an initramfs, the portion of the initramfs before loading
	89	this module must consist of compiled binaries only.
	90
	91	Most systems will not boot if you say M or N here. If unsure, say Y.
	92
1da177e4	93	config BINFMT_FLAT
3202e181	94	bool "Kernel support for flat binaries"
d782e426	95	depends on !MMU \|\| ARM \|\| M68K
1da177e4 LT	96	help
	97	Support uClinux FLAT format binaries.
	98
	99	config BINFMT_ZFLAT
	100	bool "Enable ZFLAT support"
	101	depends on BINFMT_FLAT
	102	select ZLIB_INFLATE
	103	help
	104	Support FLAT format compressed binaries
	105
	106	config BINFMT_SHARED_FLAT
	107	bool "Enable shared FLAT support"
	108	depends on BINFMT_FLAT
	109	help
	110	Support FLAT shared libraries
	111
e17c6d56 DW	112	config HAVE_AOUT
	113	def_bool n
	114
1da177e4 LT	115	config BINFMT_AOUT
1da177e4 LT	116	tristate "Kernel support for a.out and ECOFF binaries"
e17c6d56	117	depends on HAVE_AOUT
1da177e4 LT	118	---help---
	119	A.out (Assembler.OUTput) is a set of formats for libraries and
	120	executables used in the earliest versions of UNIX. Linux used
	121	the a.out formats QMAGIC and ZMAGIC until they were replaced
	122	with the ELF format.
	123
	124	The conversion to ELF started in 1995. This option is primarily
	125	provided for historical interest and for the benefit of those
	126	who need to run binaries from that era.
	127
	128	Most people should answer N here. If you think you may have
	129	occasional use for this format, enable module support above
	130	and answer M here to compile this support as a module called
	131	binfmt_aout.
	132
	133	If any crucial components of your system (such as /sbin/init
	134	or /lib/ld.so) are still in a.out format, you will have to
	135	say Y here.
	136
	137	config OSF4_COMPAT
	138	bool "OSF/1 v4 readv/writev compatibility"
	139	depends on ALPHA && BINFMT_AOUT
	140	help
	141	Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
	142	with v4 shared libraries freely available from Compaq. If you're
	143	going to use shared libraries from Tru64 version 5.0 or later, say N.
	144
	145	config BINFMT_EM86
	146	tristate "Kernel support for Linux/Intel ELF binaries"
	147	depends on ALPHA
	148	---help---
	149	Say Y here if you want to be able to execute Linux/Intel ELF
	150	binaries just like native Alpha binaries on your Alpha machine. For
	151	this to work, you need to have the emulator /usr/bin/em86 in place.
	152
	153	You can get the same functionality by saying N here and saying Y to
	154	"Kernel support for MISC binaries".
	155
	156	You may answer M to compile the emulation support as a module and
	157	later load the module when you want to use a Linux/Intel binary. The
	158	module will be called binfmt_em86. If unsure, say Y.
	159
1da177e4 LT	160	config BINFMT_MISC
	161	tristate "Kernel support for MISC binaries"
	162	---help---
	163	If you say Y here, it will be possible to plug wrapper-driven binary
	164	formats into the kernel. You will like this especially when you use
	165	programs that need an interpreter to run like Java, Python, .NET or
	166	Emacs-Lisp. It's also useful if you often run DOS executables under
	167	the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
	168	<http://www.tldp.org/docs.html#howto>). Once you have
	169	registered such a binary class with the kernel, you can start one of
	170	those programs simply by typing in its name at a shell prompt; Linux
	171	will automatically feed it to the correct interpreter.
	172
	173	You can do other nice things, too. Read the file
34962fb8	174	<file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this
8c27ceff MCC	175	feature, <file:Documentation/admin-guide/java.rst> for information about how
8c27ceff MCC	176	to include Java support. and <file:Documentation/admin-guide/mono.rst> for
1da177e4 LT	177	information about how to include Mono-based .NET support.
	178
	179	To use binfmt_misc, you will need to mount it:
	180	mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
	181
	182	You may say M here for module support and later load the module when
	183	you have use for it; the module is called binfmt_misc. If you
	184	don't know what to answer at this point, say Y.
046d662f AK	185
	186	config COREDUMP
	187	bool "Enable core dump support" if EXPERT
	188	default y
	189	help
	190	This option enables support for performing core dumps. You almost
	191	certainly want to say Y here. Not necessary on systems that never
	192	need debugging or only ever run flawless code.
006477f4 CH	193
006477f4 CH	194	endmenu