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Linus Torvalds1da177e2005-04-16 15:20:36 -07001config BINFMT_ELF
2 bool "Kernel support for ELF binaries"
David Howells2919b512006-01-08 01:01:16 -08003 depends on MMU && (BROKEN || !FRV)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 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
Roland McGrathb9d36d52008-01-30 13:31:46 +010026config COMPAT_BINFMT_ELF
27 bool
Alexey Dobriyan4cea5ce2008-10-15 22:04:17 -070028 depends on COMPAT && BINFMT_ELF
Roland McGrathb9d36d52008-01-30 13:31:46 +010029
David Daneye39f5602012-01-10 15:10:21 -080030config ARCH_BINFMT_ELF_RANDOMIZE_PIE
31 bool
32
Paul Burton774c1052014-09-11 08:30:16 +010033config ARCH_BINFMT_ELF_STATE
34 bool
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036config BINFMT_ELF_FDPIC
37 bool "Kernel support for FDPIC ELF binaries"
38 default y
Mark Salterfce24472012-04-23 10:02:08 -040039 depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 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
Roland McGrath656eb2c2008-10-18 20:28:23 -070049config CORE_DUMP_DEFAULT_ELF_HEADERS
50 bool "Write ELF core dumps with partial segments"
Roland McGrath89502152010-10-27 15:34:09 -070051 default y
David Brownell2d96d102009-01-09 16:40:52 -080052 depends on BINFMT_ELF && ELF_CORE
Roland McGrath656eb2c2008-10-18 20:28:23 -070053 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
Roland McGrath89502152010-10-27 15:34:09 -070069 seen at boot time. If unsure, say Y.
Roland McGrath656eb2c2008-10-18 20:28:23 -070070
Josh Triplett2535e0d2013-04-30 15:27:44 -070071config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070085config BINFMT_FLAT
Adrian Bunk3202e182008-04-29 00:59:02 -070086 bool "Kernel support for flat binaries"
Adrian Bunkb8c141e2008-06-05 22:45:55 -070087 depends on !MMU && (!FRV || BROKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 help
89 Support uClinux FLAT format binaries.
90
91config 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
98config BINFMT_SHARED_FLAT
99 bool "Enable shared FLAT support"
100 depends on BINFMT_FLAT
101 help
102 Support FLAT shared libraries
103
David Woodhousee17c6d52008-06-17 12:19:34 +0100104config HAVE_AOUT
105 def_bool n
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107config BINFMT_AOUT
108 tristate "Kernel support for a.out and ECOFF binaries"
David Woodhousee17c6d52008-06-17 12:19:34 +0100109 depends on HAVE_AOUT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 ---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
129config 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
137config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152config BINFMT_MISC
153 tristate "Kernel support for MISC binaries"
154 ---help---
155 If you say Y here, it will be possible to plug wrapper-driven binary
156 formats into the kernel. You will like this especially when you use
157 programs that need an interpreter to run like Java, Python, .NET or
158 Emacs-Lisp. It's also useful if you often run DOS executables under
159 the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
160 <http://www.tldp.org/docs.html#howto>). Once you have
161 registered such a binary class with the kernel, you can start one of
162 those programs simply by typing in its name at a shell prompt; Linux
163 will automatically feed it to the correct interpreter.
164
165 You can do other nice things, too. Read the file
166 <file:Documentation/binfmt_misc.txt> to learn how to use this
167 feature, <file:Documentation/java.txt> for information about how
168 to include Java support. and <file:Documentation/mono.txt> for
169 information about how to include Mono-based .NET support.
170
171 To use binfmt_misc, you will need to mount it:
172 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
173
174 You may say M here for module support and later load the module when
175 you have use for it; the module is called binfmt_misc. If you
176 don't know what to answer at this point, say Y.
Alex Kelly046d6622012-10-04 17:15:23 -0700177
178config COREDUMP
179 bool "Enable core dump support" if EXPERT
180 default y
181 help
182 This option enables support for performing core dumps. You almost
183 certainly want to say Y here. Not necessary on systems that never
184 need debugging or only ever run flawless code.