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Linux/fs/Kconfig.binfmt

  1 config BINFMT_ELF
  2         bool "Kernel support for ELF binaries"
  3         depends on MMU && (BROKEN || !FRV)
  4         default y
  5         ---help---
  6           ELF (Executable and Linkable Format) is a format for libraries and
  7           executables used across different architectures and operating
  8           systems. Saying Y here will enable your kernel to run ELF binaries
  9           and enlarge it by about 13 KB. ELF support under Linux has now all
 10           but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
 11           because it is portable (this does *not* mean that you will be able
 12           to run executables from different architectures or operating systems
 13           however) and makes building run-time libraries very easy. Many new
 14           executables are distributed solely in ELF format. You definitely
 15           want to say Y here.
 16 
 17           Information about ELF is contained in the ELF HOWTO available from
 18           <http://www.tldp.org/docs.html#howto>.
 19 
 20           If you find that after upgrading from Linux kernel 1.2 and saying Y
 21           here, you still can't run any ELF binaries (they just crash), then
 22           you'll have to install the newest ELF runtime libraries, including
 23           ld.so (check the file <file:Documentation/Changes> for location and
 24           latest version).
 25 
 26 config COMPAT_BINFMT_ELF
 27         bool
 28         depends on COMPAT && BINFMT_ELF
 29 
 30 config ARCH_BINFMT_ELF_RANDOMIZE_PIE
 31         bool
 32 
 33 config ARCH_BINFMT_ELF_STATE
 34         bool
 35 
 36 config BINFMT_ELF_FDPIC
 37         bool "Kernel support for FDPIC ELF binaries"
 38         default y
 39         depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
 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.
 46 
 47           It is also possible to run FDPIC ELF binaries on MMU linux also.
 48 
 49 config CORE_DUMP_DEFAULT_ELF_HEADERS
 50         bool "Write ELF core dumps with partial segments"
 51         default y
 52         depends on BINFMT_ELF && ELF_CORE
 53         help
 54           ELF core dump files describe each memory mapping of the crashed
 55           process, and can contain or omit the memory contents of each one.
 56           The contents of an unmodified text mapping are omitted by default.
 57 
 58           For an unmodified text mapping of an ELF object, including just
 59           the first page of the file in a core dump makes it possible to
 60           identify the build ID bits in the file, without paying the i/o
 61           cost and disk space to dump all the text.  However, versions of
 62           GDB before 6.7 are confused by ELF core dump files in this format.
 63 
 64           The core dump behavior can be controlled per process using
 65           the /proc/PID/coredump_filter pseudo-file; this setting is
 66           inherited.  See Documentation/filesystems/proc.txt for details.
 67 
 68           This config option changes the default setting of coredump_filter
 69           seen at boot time.  If unsure, say Y.
 70 
 71 config BINFMT_SCRIPT
 72         tristate "Kernel support for scripts starting with #!"
 73         default y
 74         help
 75           Say Y here if you want to execute interpreted scripts starting with
 76           #! followed by the path to an interpreter.
 77 
 78           You can build this support as a module; however, until that module
 79           gets loaded, you cannot run scripts.  Thus, if you want to load this
 80           module from an initramfs, the portion of the initramfs before loading
 81           this module must consist of compiled binaries only.
 82 
 83           Most systems will not boot if you say M or N here.  If unsure, say Y.
 84 
 85 config BINFMT_FLAT
 86         bool "Kernel support for flat binaries"
 87         depends on !MMU && (!FRV || BROKEN)
 88         help
 89           Support uClinux FLAT format binaries.
 90 
 91 config BINFMT_ZFLAT
 92         bool "Enable ZFLAT support"
 93         depends on BINFMT_FLAT
 94         select ZLIB_INFLATE
 95         help
 96           Support FLAT format compressed binaries
 97 
 98 config BINFMT_SHARED_FLAT
 99         bool "Enable shared FLAT support"
100         depends on BINFMT_FLAT
101         help
102           Support FLAT shared libraries
103 
104 config HAVE_AOUT
105        def_bool n
106 
107 config BINFMT_AOUT
108         tristate "Kernel support for a.out and ECOFF binaries"
109         depends on HAVE_AOUT
110         ---help---
111           A.out (Assembler.OUTput) is a set of formats for libraries and
112           executables used in the earliest versions of UNIX.  Linux used
113           the a.out formats QMAGIC and ZMAGIC until they were replaced
114           with the ELF format.
115 
116           The conversion to ELF started in 1995.  This option is primarily
117           provided for historical interest and for the benefit of those
118           who need to run binaries from that era.
119 
120           Most people should answer N here.  If you think you may have
121           occasional use for this format, enable module support above
122           and answer M here to compile this support as a module called
123           binfmt_aout.
124 
125           If any crucial components of your system (such as /sbin/init
126           or /lib/ld.so) are still in a.out format, you will have to
127           say Y here.
128 
129 config OSF4_COMPAT
130         bool "OSF/1 v4 readv/writev compatibility"
131         depends on ALPHA && BINFMT_AOUT
132         help
133           Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
134           with v4 shared libraries freely available from Compaq. If you're
135           going to use shared libraries from Tru64 version 5.0 or later, say N.
136 
137 config BINFMT_EM86
138         tristate "Kernel support for Linux/Intel ELF binaries"
139         depends on ALPHA
140         ---help---
141           Say Y here if you want to be able to execute Linux/Intel ELF
142           binaries just like native Alpha binaries on your Alpha machine. For
143           this to work, you need to have the emulator /usr/bin/em86 in place.
144 
145           You can get the same functionality by saying N here and saying Y to
146           "Kernel support for MISC binaries".
147 
148           You may answer M to compile the emulation support as a module and
149           later load the module when you want to use a Linux/Intel binary. The
150           module will be called binfmt_em86. If unsure, say Y.
151 
152 config BINFMT_SOM
153         tristate "Kernel support for SOM binaries"
154         depends on PARISC && HPUX
155         help
156           SOM is a binary executable format inherited from HP/UX.  Say
157           Y here to be able to load and execute SOM binaries directly.
158 
159 config BINFMT_MISC
160         tristate "Kernel support for MISC binaries"
161         ---help---
162           If you say Y here, it will be possible to plug wrapper-driven binary
163           formats into the kernel. You will like this especially when you use
164           programs that need an interpreter to run like Java, Python, .NET or
165           Emacs-Lisp. It's also useful if you often run DOS executables under
166           the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
167           <http://www.tldp.org/docs.html#howto>). Once you have
168           registered such a binary class with the kernel, you can start one of
169           those programs simply by typing in its name at a shell prompt; Linux
170           will automatically feed it to the correct interpreter.
171 
172           You can do other nice things, too. Read the file
173           <file:Documentation/binfmt_misc.txt> to learn how to use this
174           feature, <file:Documentation/java.txt> for information about how
175           to include Java support. and <file:Documentation/mono.txt> for
176           information about how to include Mono-based .NET support.
177 
178           To use binfmt_misc, you will need to mount it:
179                 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
180 
181           You may say M here for module support and later load the module when
182           you have use for it; the module is called binfmt_misc. If you
183           don't know what to answer at this point, say Y.
184 
185 config COREDUMP
186         bool "Enable core dump support" if EXPERT
187         default y
188         help
189           This option enables support for performing core dumps. You almost
190           certainly want to say Y here. Not necessary on systems that never
191           need debugging or only ever run flawless code.

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