1config BINFMT_ELF 2 bool "Kernel support for ELF binaries" 3 depends on MMU 4 select ELFCORE 5 default y 6 ---help--- 7 ELF (Executable and Linkable Format) is a format for libraries and 8 executables used across different architectures and operating 9 systems. Saying Y here will enable your kernel to run ELF binaries 10 and enlarge it by about 13 KB. ELF support under Linux has now all 11 but replaced the traditional Linux a.out formats (QMAGIC and ZMAGIC) 12 because it is portable (this does *not* mean that you will be able 13 to run executables from different architectures or operating systems 14 however) and makes building run-time libraries very easy. Many new 15 executables are distributed solely in ELF format. You definitely 16 want to say Y here. 17 18 Information about ELF is contained in the ELF HOWTO available from 19 <http://www.tldp.org/docs.html#howto>. 20 21 If you find that after upgrading from Linux kernel 1.2 and saying Y 22 here, you still can't run any ELF binaries (they just crash), then 23 you'll have to install the newest ELF runtime libraries, including 24 ld.so (check the file <file:Documentation/Changes> for location and 25 latest version). 26 27config COMPAT_BINFMT_ELF 28 bool 29 depends on COMPAT && BINFMT_ELF 30 select ELFCORE 31 32config ARCH_BINFMT_ELF_STATE 33 bool 34 35config BINFMT_ELF_FDPIC 36 bool "Kernel support for FDPIC ELF binaries" 37 default y if !BINFMT_ELF 38 depends on (ARM || (SUPERH32 && !MMU) || C6X) 39 select ELFCORE 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 49config ELFCORE 50 bool 51 help 52 This option enables kernel/elfcore.o. 53 54config CORE_DUMP_DEFAULT_ELF_HEADERS 55 bool "Write ELF core dumps with partial segments" 56 default y 57 depends on BINFMT_ELF && ELF_CORE 58 help 59 ELF core dump files describe each memory mapping of the crashed 60 process, and can contain or omit the memory contents of each one. 61 The contents of an unmodified text mapping are omitted by default. 62 63 For an unmodified text mapping of an ELF object, including just 64 the first page of the file in a core dump makes it possible to 65 identify the build ID bits in the file, without paying the i/o 66 cost and disk space to dump all the text. However, versions of 67 GDB before 6.7 are confused by ELF core dump files in this format. 68 69 The core dump behavior can be controlled per process using 70 the /proc/PID/coredump_filter pseudo-file; this setting is 71 inherited. See Documentation/filesystems/proc.txt for details. 72 73 This config option changes the default setting of coredump_filter 74 seen at boot time. If unsure, say Y. 75 76config BINFMT_SCRIPT 77 tristate "Kernel support for scripts starting with #!" 78 default y 79 help 80 Say Y here if you want to execute interpreted scripts starting with 81 #! followed by the path to an interpreter. 82 83 You can build this support as a module; however, until that module 84 gets loaded, you cannot run scripts. Thus, if you want to load this 85 module from an initramfs, the portion of the initramfs before loading 86 this module must consist of compiled binaries only. 87 88 Most systems will not boot if you say M or N here. If unsure, say Y. 89 90config BINFMT_FLAT 91 bool "Kernel support for flat binaries" 92 depends on !MMU || ARM || M68K 93 help 94 Support uClinux FLAT format binaries. 95 96config BINFMT_ZFLAT 97 bool "Enable ZFLAT support" 98 depends on BINFMT_FLAT 99 select ZLIB_INFLATE 100 help 101 Support FLAT format compressed binaries 102 103config BINFMT_SHARED_FLAT 104 bool "Enable shared FLAT support" 105 depends on BINFMT_FLAT 106 help 107 Support FLAT shared libraries 108 109config HAVE_AOUT 110 def_bool n 111 112config BINFMT_AOUT 113 tristate "Kernel support for a.out and ECOFF binaries" 114 depends on HAVE_AOUT 115 ---help--- 116 A.out (Assembler.OUTput) is a set of formats for libraries and 117 executables used in the earliest versions of UNIX. Linux used 118 the a.out formats QMAGIC and ZMAGIC until they were replaced 119 with the ELF format. 120 121 The conversion to ELF started in 1995. This option is primarily 122 provided for historical interest and for the benefit of those 123 who need to run binaries from that era. 124 125 Most people should answer N here. If you think you may have 126 occasional use for this format, enable module support above 127 and answer M here to compile this support as a module called 128 binfmt_aout. 129 130 If any crucial components of your system (such as /sbin/init 131 or /lib/ld.so) are still in a.out format, you will have to 132 say Y here. 133 134config OSF4_COMPAT 135 bool "OSF/1 v4 readv/writev compatibility" 136 depends on ALPHA && BINFMT_AOUT 137 help 138 Say Y if you are using OSF/1 binaries (like Netscape and Acrobat) 139 with v4 shared libraries freely available from Compaq. If you're 140 going to use shared libraries from Tru64 version 5.0 or later, say N. 141 142config BINFMT_EM86 143 tristate "Kernel support for Linux/Intel ELF binaries" 144 depends on ALPHA 145 ---help--- 146 Say Y here if you want to be able to execute Linux/Intel ELF 147 binaries just like native Alpha binaries on your Alpha machine. For 148 this to work, you need to have the emulator /usr/bin/em86 in place. 149 150 You can get the same functionality by saying N here and saying Y to 151 "Kernel support for MISC binaries". 152 153 You may answer M to compile the emulation support as a module and 154 later load the module when you want to use a Linux/Intel binary. The 155 module will be called binfmt_em86. If unsure, say Y. 156 157config BINFMT_MISC 158 tristate "Kernel support for MISC binaries" 159 ---help--- 160 If you say Y here, it will be possible to plug wrapper-driven binary 161 formats into the kernel. You will like this especially when you use 162 programs that need an interpreter to run like Java, Python, .NET or 163 Emacs-Lisp. It's also useful if you often run DOS executables under 164 the Linux DOS emulator DOSEMU (read the DOSEMU-HOWTO, available from 165 <http://www.tldp.org/docs.html#howto>). Once you have 166 registered such a binary class with the kernel, you can start one of 167 those programs simply by typing in its name at a shell prompt; Linux 168 will automatically feed it to the correct interpreter. 169 170 You can do other nice things, too. Read the file 171 <file:Documentation/admin-guide/binfmt-misc.rst> to learn how to use this 172 feature, <file:Documentation/admin-guide/java.rst> for information about how 173 to include Java support. and <file:Documentation/admin-guide/mono.rst> for 174 information about how to include Mono-based .NET support. 175 176 To use binfmt_misc, you will need to mount it: 177 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc 178 179 You may say M here for module support and later load the module when 180 you have use for it; the module is called binfmt_misc. If you 181 don't know what to answer at this point, say Y. 182 183config COREDUMP 184 bool "Enable core dump support" if EXPERT 185 default y 186 help 187 This option enables support for performing core dumps. You almost 188 certainly want to say Y here. Not necessary on systems that never 189 need debugging or only ever run flawless code. 190