1 # SPDX-License-Identifier: GPL-2.0-only <<
2 <<
3 menu "Executable file formats" <<
4 <<
5 config BINFMT_ELF 1 config BINFMT_ELF
6 bool "Kernel support for ELF binaries" 2 bool "Kernel support for ELF binaries"
7 depends on MMU !! 3 depends on MMU && (BROKEN || !FRV)
8 select ELFCORE 4 select ELFCORE
9 default y 5 default y
10 help !! 6 ---help---
11 ELF (Executable and Linkable Format) 7 ELF (Executable and Linkable Format) is a format for libraries and
12 executables used across different ar 8 executables used across different architectures and operating
13 systems. Saying Y here will enable y 9 systems. Saying Y here will enable your kernel to run ELF binaries
14 and enlarge it by about 13 KB. ELF s 10 and enlarge it by about 13 KB. ELF support under Linux has now all
15 but replaced the traditional Linux a 11 but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC)
16 because it is portable (this does *n 12 because it is portable (this does *not* mean that you will be able
17 to run executables from different ar 13 to run executables from different architectures or operating systems
18 however) and makes building run-time 14 however) and makes building run-time libraries very easy. Many new
19 executables are distributed solely i 15 executables are distributed solely in ELF format. You definitely
20 want to say Y here. 16 want to say Y here.
21 17
22 Information about ELF is contained i 18 Information about ELF is contained in the ELF HOWTO available from
23 <http://www.tldp.org/docs.html#howto 19 <http://www.tldp.org/docs.html#howto>.
24 20
25 If you find that after upgrading fro 21 If you find that after upgrading from Linux kernel 1.2 and saying Y
26 here, you still can't run any ELF bi 22 here, you still can't run any ELF binaries (they just crash), then
27 you'll have to install the newest EL 23 you'll have to install the newest ELF runtime libraries, including
28 ld.so (check the file <file:Document 24 ld.so (check the file <file:Documentation/Changes> for location and
29 latest version). 25 latest version).
30 26
31 config BINFMT_ELF_KUNIT_TEST <<
32 bool "Build KUnit tests for ELF binary <<
33 depends on KUNIT=y && BINFMT_ELF=y <<
34 default KUNIT_ALL_TESTS <<
35 help <<
36 This builds the ELF loader KUnit tes <<
37 prior bug fixes into a regression te <<
38 only needed for debugging. Note that <<
39 compat_binfmt_elf KUnit test is also <<
40 <<
41 config COMPAT_BINFMT_ELF 27 config COMPAT_BINFMT_ELF
42 def_bool y !! 28 bool
43 depends on COMPAT && BINFMT_ELF 29 depends on COMPAT && BINFMT_ELF
44 select ELFCORE 30 select ELFCORE
45 31
46 config ARCH_BINFMT_ELF_STATE 32 config ARCH_BINFMT_ELF_STATE
47 bool 33 bool
48 34
49 config ARCH_BINFMT_ELF_EXTRA_PHDRS <<
50 bool <<
51 <<
52 config ARCH_HAVE_ELF_PROT <<
53 bool <<
54 <<
55 config ARCH_USE_GNU_PROPERTY <<
56 bool <<
57 <<
58 config BINFMT_ELF_FDPIC 35 config BINFMT_ELF_FDPIC
59 bool "Kernel support for FDPIC ELF bin 36 bool "Kernel support for FDPIC ELF binaries"
60 default y if !BINFMT_ELF !! 37 default y
61 depends on ARM || ((M68K || RISCV || S !! 38 depends on (FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X)
62 select ELFCORE 39 select ELFCORE
63 help 40 help
64 ELF FDPIC binaries are based on ELF, 41 ELF FDPIC binaries are based on ELF, but allow the individual load
65 segments of a binary to be located i 42 segments of a binary to be located in memory independently of each
66 other. This makes this format ideal 43 other. This makes this format ideal for use in environments where no
67 MMU is available as it still permits 44 MMU is available as it still permits text segments to be shared,
68 even if data segments are not. 45 even if data segments are not.
69 46
70 It is also possible to run FDPIC ELF 47 It is also possible to run FDPIC ELF binaries on MMU linux also.
71 48
72 config ELFCORE 49 config ELFCORE
73 bool 50 bool
74 help 51 help
75 This option enables kernel/elfcore.o 52 This option enables kernel/elfcore.o.
76 53
77 config CORE_DUMP_DEFAULT_ELF_HEADERS 54 config CORE_DUMP_DEFAULT_ELF_HEADERS
78 bool "Write ELF core dumps with partia 55 bool "Write ELF core dumps with partial segments"
79 default y 56 default y
80 depends on BINFMT_ELF && ELF_CORE 57 depends on BINFMT_ELF && ELF_CORE
81 help 58 help
82 ELF core dump files describe each me 59 ELF core dump files describe each memory mapping of the crashed
83 process, and can contain or omit the 60 process, and can contain or omit the memory contents of each one.
84 The contents of an unmodified text m 61 The contents of an unmodified text mapping are omitted by default.
85 62
86 For an unmodified text mapping of an 63 For an unmodified text mapping of an ELF object, including just
87 the first page of the file in a core 64 the first page of the file in a core dump makes it possible to
88 identify the build ID bits in the fi 65 identify the build ID bits in the file, without paying the i/o
89 cost and disk space to dump all the 66 cost and disk space to dump all the text. However, versions of
90 GDB before 6.7 are confused by ELF c 67 GDB before 6.7 are confused by ELF core dump files in this format.
91 68
92 The core dump behavior can be contro 69 The core dump behavior can be controlled per process using
93 the /proc/PID/coredump_filter pseudo 70 the /proc/PID/coredump_filter pseudo-file; this setting is
94 inherited. See Documentation/filesy !! 71 inherited. See Documentation/filesystems/proc.txt for details.
95 72
96 This config option changes the defau 73 This config option changes the default setting of coredump_filter
97 seen at boot time. If unsure, say Y 74 seen at boot time. If unsure, say Y.
98 75
99 config BINFMT_SCRIPT 76 config BINFMT_SCRIPT
100 tristate "Kernel support for scripts s 77 tristate "Kernel support for scripts starting with #!"
101 default y 78 default y
102 help 79 help
103 Say Y here if you want to execute in 80 Say Y here if you want to execute interpreted scripts starting with
104 #! followed by the path to an interp 81 #! followed by the path to an interpreter.
105 82
106 You can build this support as a modu 83 You can build this support as a module; however, until that module
107 gets loaded, you cannot run scripts. 84 gets loaded, you cannot run scripts. Thus, if you want to load this
108 module from an initramfs, the portio 85 module from an initramfs, the portion of the initramfs before loading
109 this module must consist of compiled 86 this module must consist of compiled binaries only.
110 87
111 Most systems will not boot if you sa 88 Most systems will not boot if you say M or N here. If unsure, say Y.
112 89
113 config ARCH_HAS_BINFMT_FLAT <<
114 bool <<
115 <<
116 config BINFMT_FLAT 90 config BINFMT_FLAT
117 bool "Kernel support for flat binaries 91 bool "Kernel support for flat binaries"
118 depends on ARCH_HAS_BINFMT_FLAT !! 92 depends on !MMU || ARM || M68K
>> 93 depends on !FRV || BROKEN
119 help 94 help
120 Support uClinux FLAT format binaries 95 Support uClinux FLAT format binaries.
121 96
122 config BINFMT_FLAT_ARGVP_ENVP_ON_STACK <<
123 bool <<
124 <<
125 config BINFMT_FLAT_OLD_ALWAYS_RAM <<
126 bool <<
127 <<
128 config BINFMT_FLAT_NO_DATA_START_OFFSET <<
129 bool <<
130 <<
131 config BINFMT_FLAT_OLD <<
132 bool "Enable support for very old lega <<
133 depends on BINFMT_FLAT <<
134 help <<
135 Support decade old uClinux FLAT form <<
136 you have some of those say N here. <<
137 <<
138 config BINFMT_ZFLAT 97 config BINFMT_ZFLAT
139 bool "Enable ZFLAT support" 98 bool "Enable ZFLAT support"
140 depends on BINFMT_FLAT 99 depends on BINFMT_FLAT
141 select ZLIB_INFLATE 100 select ZLIB_INFLATE
142 help 101 help
143 Support FLAT format compressed binar 102 Support FLAT format compressed binaries
144 103
>> 104 config BINFMT_SHARED_FLAT
>> 105 bool "Enable shared FLAT support"
>> 106 depends on BINFMT_FLAT
>> 107 help
>> 108 Support FLAT shared libraries
>> 109
>> 110 config HAVE_AOUT
>> 111 def_bool n
>> 112
>> 113 config BINFMT_AOUT
>> 114 tristate "Kernel support for a.out and ECOFF binaries"
>> 115 depends on HAVE_AOUT
>> 116 ---help---
>> 117 A.out (Assembler.OUTput) is a set of formats for libraries and
>> 118 executables used in the earliest versions of UNIX. Linux used
>> 119 the a.out formats QMAGIC and ZMAGIC until they were replaced
>> 120 with the ELF format.
>> 121
>> 122 The conversion to ELF started in 1995. This option is primarily
>> 123 provided for historical interest and for the benefit of those
>> 124 who need to run binaries from that era.
>> 125
>> 126 Most people should answer N here. If you think you may have
>> 127 occasional use for this format, enable module support above
>> 128 and answer M here to compile this support as a module called
>> 129 binfmt_aout.
>> 130
>> 131 If any crucial components of your system (such as /sbin/init
>> 132 or /lib/ld.so) are still in a.out format, you will have to
>> 133 say Y here.
>> 134
>> 135 config OSF4_COMPAT
>> 136 bool "OSF/1 v4 readv/writev compatibility"
>> 137 depends on ALPHA && BINFMT_AOUT
>> 138 help
>> 139 Say Y if you are using OSF/1 binaries (like Netscape and Acrobat)
>> 140 with v4 shared libraries freely available from Compaq. If you're
>> 141 going to use shared libraries from Tru64 version 5.0 or later, say N.
>> 142
>> 143 config BINFMT_EM86
>> 144 tristate "Kernel support for Linux/Intel ELF binaries"
>> 145 depends on ALPHA
>> 146 ---help---
>> 147 Say Y here if you want to be able to execute Linux/Intel ELF
>> 148 binaries just like native Alpha binaries on your Alpha machine. For
>> 149 this to work, you need to have the emulator /usr/bin/em86 in place.
>> 150
>> 151 You can get the same functionality by saying N here and saying Y to
>> 152 "Kernel support for MISC binaries".
>> 153
>> 154 You may answer M to compile the emulation support as a module and
>> 155 later load the module when you want to use a Linux/Intel binary. The
>> 156 module will be called binfmt_em86. If unsure, say Y.
>> 157
145 config BINFMT_MISC 158 config BINFMT_MISC
146 tristate "Kernel support for MISC bina 159 tristate "Kernel support for MISC binaries"
147 help !! 160 ---help---
148 If you say Y here, it will be possib 161 If you say Y here, it will be possible to plug wrapper-driven binary
149 formats into the kernel. You will li 162 formats into the kernel. You will like this especially when you use
150 programs that need an interpreter to 163 programs that need an interpreter to run like Java, Python, .NET or
151 Emacs-Lisp. It's also useful if you 164 Emacs-Lisp. It's also useful if you often run DOS executables under
152 the Linux DOS emulator DOSEMU (read 165 the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from
153 <http://www.tldp.org/docs.html#howto 166 <http://www.tldp.org/docs.html#howto>). Once you have
154 registered such a binary class with 167 registered such a binary class with the kernel, you can start one of
155 those programs simply by typing in i 168 those programs simply by typing in its name at a shell prompt; Linux
156 will automatically feed it to the co 169 will automatically feed it to the correct interpreter.
157 170
158 You can do other nice things, too. R 171 You can do other nice things, too. Read the file
159 <file:Documentation/admin-guide/binf !! 172 <file:Documentation/binfmt_misc.txt> to learn how to use this
160 feature, <file:Documentation/admin-g 173 feature, <file:Documentation/admin-guide/java.rst> for information about how
161 to include Java support. and <file:D 174 to include Java support. and <file:Documentation/admin-guide/mono.rst> for
162 information about how to include Mon 175 information about how to include Mono-based .NET support.
163 176
164 To use binfmt_misc, you will need to 177 To use binfmt_misc, you will need to mount it:
165 mount binfmt_misc -t binfmt_mi 178 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
166 179
167 You may say M here for module suppor 180 You may say M here for module support and later load the module when
168 you have use for it; the module is c 181 you have use for it; the module is called binfmt_misc. If you
169 don't know what to answer at this po 182 don't know what to answer at this point, say Y.
170 183
171 config COREDUMP 184 config COREDUMP
172 bool "Enable core dump support" if EXP 185 bool "Enable core dump support" if EXPERT
173 default y 186 default y
174 help 187 help
175 This option enables support for perf 188 This option enables support for performing core dumps. You almost
176 certainly want to say Y here. Not ne 189 certainly want to say Y here. Not necessary on systems that never
177 need debugging or only ever run flaw 190 need debugging or only ever run flawless code.
178 <<
179 config EXEC_KUNIT_TEST <<
180 bool "Build execve tests" if !KUNIT_AL <<
181 depends on KUNIT=y <<
182 default KUNIT_ALL_TESTS <<
183 help <<
184 This builds the exec KUnit tests, wh <<
185 of various aspects of the exec inter <<
186 <<
187 endmenu <<
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