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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 BINFMT_ELF_FDPIC
 34         bool "Kernel support for FDPIC ELF binaries"
 35         default y
 36         depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
 37         help
 38           ELF FDPIC binaries are based on ELF, but allow the individual load
 39           segments of a binary to be located in memory independently of each
 40           other. This makes this format ideal for use in environments where no
 41           MMU is available as it still permits text segments to be shared,
 42           even if data segments are not.
 43 
 44           It is also possible to run FDPIC ELF binaries on MMU linux also.
 45 
 46 config CORE_DUMP_DEFAULT_ELF_HEADERS
 47         bool "Write ELF core dumps with partial segments"
 48         default y
 49         depends on BINFMT_ELF && ELF_CORE
 50         help
 51           ELF core dump files describe each memory mapping of the crashed
 52           process, and can contain or omit the memory contents of each one.
 53           The contents of an unmodified text mapping are omitted by default.
 54 
 55           For an unmodified text mapping of an ELF object, including just
 56           the first page of the file in a core dump makes it possible to
 57           identify the build ID bits in the file, without paying the i/o
 58           cost and disk space to dump all the text.  However, versions of
 59           GDB before 6.7 are confused by ELF core dump files in this format.
 60 
 61           The core dump behavior can be controlled per process using
 62           the /proc/PID/coredump_filter pseudo-file; this setting is
 63           inherited.  See Documentation/filesystems/proc.txt for details.
 64 
 65           This config option changes the default setting of coredump_filter
 66           seen at boot time.  If unsure, say Y.
 67 
 68 config BINFMT_SCRIPT
 69         tristate "Kernel support for scripts starting with #!"
 70         default y
 71         help
 72           Say Y here if you want to execute interpreted scripts starting with
 73           #! followed by the path to an interpreter.
 74 
 75           You can build this support as a module; however, until that module
 76           gets loaded, you cannot run scripts.  Thus, if you want to load this
 77           module from an initramfs, the portion of the initramfs before loading
 78           this module must consist of compiled binaries only.
 79 
 80           Most systems will not boot if you say M or N here.  If unsure, say Y.
 81 
 82 config BINFMT_FLAT
 83         bool "Kernel support for flat binaries"
 84         depends on !MMU && (!FRV || BROKEN)
 85         help
 86           Support uClinux FLAT format binaries.
 87 
 88 config BINFMT_ZFLAT
 89         bool "Enable ZFLAT support"
 90         depends on BINFMT_FLAT
 91         select ZLIB_INFLATE
 92         help
 93           Support FLAT format compressed binaries
 94 
 95 config BINFMT_SHARED_FLAT
 96         bool "Enable shared FLAT support"
 97         depends on BINFMT_FLAT
 98         help
 99           Support FLAT shared libraries
100 
101 config HAVE_AOUT
102        def_bool n
103 
104 config BINFMT_AOUT
105         tristate "Kernel support for a.out and ECOFF binaries"
106         depends on HAVE_AOUT
107         ---help---
108           A.out (Assembler.OUTput) is a set of formats for libraries and
109           executables used in the earliest versions of UNIX.  Linux used
110           the a.out formats QMAGIC and ZMAGIC until they were replaced
111           with the ELF format.
112 
113           The conversion to ELF started in 1995.  This option is primarily
114           provided for historical interest and for the benefit of those
115           who need to run binaries from that era.
116 
117           Most people should answer N here.  If you think you may have
118           occasional use for this format, enable module support above
119           and answer M here to compile this support as a module called
120           binfmt_aout.
121 
122           If any crucial components of your system (such as /sbin/init
123           or /lib/ld.so) are still in a.out format, you will have to
124           say Y here.
125 
126 config OSF4_COMPAT
127         bool "OSF/1 v4 readv/writev compatibility"
128         depends on ALPHA && BINFMT_AOUT
129         help
130           Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
131           with v4 shared libraries freely available from Compaq. If you're
132           going to use shared libraries from Tru64 version 5.0 or later, say N.
133 
134 config BINFMT_EM86
135         tristate "Kernel support for Linux/Intel ELF binaries"
136         depends on ALPHA
137         ---help---
138           Say Y here if you want to be able to execute Linux/Intel ELF
139           binaries just like native Alpha binaries on your Alpha machine. For
140           this to work, you need to have the emulator /usr/bin/em86 in place.
141 
142           You can get the same functionality by saying N here and saying Y to
143           "Kernel support for MISC binaries".
144 
145           You may answer M to compile the emulation support as a module and
146           later load the module when you want to use a Linux/Intel binary. The
147           module will be called binfmt_em86. If unsure, say Y.
148 
149 config BINFMT_SOM
150         tristate "Kernel support for SOM binaries"
151         depends on PARISC && HPUX
152         help
153           SOM is a binary executable format inherited from HP/UX.  Say
154           Y here to be able to load and execute SOM binaries directly.
155 
156 config BINFMT_MISC
157         tristate "Kernel support for MISC binaries"
158         ---help---
159           If you say Y here, it will be possible to plug wrapper-driven binary
160           formats into the kernel. You will like this especially when you use
161           programs that need an interpreter to run like Java, Python, .NET or
162           Emacs-Lisp. It's also useful if you often run DOS executables under
163           the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
164           <http://www.tldp.org/docs.html#howto>). Once you have
165           registered such a binary class with the kernel, you can start one of
166           those programs simply by typing in its name at a shell prompt; Linux
167           will automatically feed it to the correct interpreter.
168 
169           You can do other nice things, too. Read the file
170           <file:Documentation/binfmt_misc.txt> to learn how to use this
171           feature, <file:Documentation/java.txt> for information about how
172           to include Java support. and <file:Documentation/mono.txt> for
173           information about how to include Mono-based .NET support.
174 
175           To use binfmt_misc, you will need to mount it:
176                 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
177 
178           You may say M here for module support and later load the module when
179           you have use for it; the module is called binfmt_misc. If you
180           don't know what to answer at this point, say Y.
181 
182 config COREDUMP
183         bool "Enable core dump support" if EXPERT
184         default y
185         help
186           This option enables support for performing core dumps. You almost
187           certainly want to say Y here. Not necessary on systems that never
188           need debugging or only ever run flawless code.

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