131 lines
4.4 KiB
Plaintext
131 lines
4.4 KiB
Plaintext
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#------------------------------------------------------------------------------
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# freebsd: file(1) magic for FreeBSD objects
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#
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# All new-style FreeBSD magic numbers are in host byte order (i.e.,
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# little-endian on x86).
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#
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# XXX - this comes from the file "freebsd" in a recent FreeBSD version of
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# "file"; it, and the NetBSD stuff in "netbsd", appear to use different
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# schemes for distinguishing between executable images, shared libraries,
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# and object files.
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#
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# FreeBSD says:
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#
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# Regardless of whether it's pure, demand-paged, or none of the
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# above:
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#
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# if the entry point is < 4096, then it's a shared library if
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# the "has run-time loader information" bit is set, and is
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# position-independent if the "is position-independent" bit
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# is set;
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#
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# if the entry point is >= 4096 (or >4095, same thing), then it's
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# an executable, and is dynamically-linked if the "has run-time
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# loader information" bit is set.
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#
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# On x86, NetBSD says:
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#
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# If it's neither pure nor demand-paged:
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#
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# if it has the "has run-time loader information" bit set, it's
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# a dynamically-linked executable;
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#
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# if it doesn't have that bit set, then:
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#
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# if it has the "is position-independent" bit set, it's
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# position-independent;
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#
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# if the entry point is non-zero, it's an executable, otherwise
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# it's an object file.
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#
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# If it's pure:
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#
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# if it has the "has run-time loader information" bit set, it's
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# a dynamically-linked executable, otherwise it's just an
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# executable.
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#
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# If it's demand-paged:
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#
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# if it has the "has run-time loader information" bit set,
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# then:
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#
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# if the entry point is < 4096, it's a shared library;
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#
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# if the entry point is = 4096 or > 4096 (i.e., >= 4096),
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# it's a dynamically-linked executable);
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#
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# if it doesn't have the "has run-time loader information" bit
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# set, then it's just an executable.
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#
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# (On non-x86, NetBSD does much the same thing, except that it uses
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# 8192 on 68K - except for "68k4k", which is presumably "68K with 4K
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# pages - SPARC, and MIPS, presumably because Sun-3's and Sun-4's
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# had 8K pages; dunno about MIPS.)
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#
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# I suspect the two will differ only in perverse and uninteresting cases
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# ("shared" libraries that aren't demand-paged and whose pages probably
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# won't actually be shared, executables with entry points <4096).
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#
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# I leave it to those more familiar with FreeBSD and NetBSD to figure out
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# what the right answer is (although using ">4095", FreeBSD-style, is
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# probably better than separately checking for "=4096" and ">4096",
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# NetBSD-style). (The old "netbsd" file analyzed FreeBSD demand paged
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# executables using the NetBSD technique.)
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#
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0 lelong&0377777777 041400407 FreeBSD/i386
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>20 lelong <4096
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>>3 byte&0xC0 &0x80 shared library
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>>3 byte&0xC0 0x40 PIC object
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>>3 byte&0xC0 0x00 object
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>20 lelong >4095
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>>3 byte&0x80 0x80 dynamically linked executable
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>>3 byte&0x80 0x00 executable
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>16 lelong >0 not stripped
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0 lelong&0377777777 041400410 FreeBSD/i386 pure
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>20 lelong <4096
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>>3 byte&0xC0 &0x80 shared library
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>>3 byte&0xC0 0x40 PIC object
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>>3 byte&0xC0 0x00 object
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>20 lelong >4095
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>>3 byte&0x80 0x80 dynamically linked executable
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>>3 byte&0x80 0x00 executable
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>16 lelong >0 not stripped
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0 lelong&0377777777 041400413 FreeBSD/i386 demand paged
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>20 lelong <4096
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>>3 byte&0xC0 &0x80 shared library
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>>3 byte&0xC0 0x40 PIC object
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>>3 byte&0xC0 0x00 object
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>20 lelong >4095
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>>3 byte&0x80 0x80 dynamically linked executable
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>>3 byte&0x80 0x00 executable
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>16 lelong >0 not stripped
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0 lelong&0377777777 041400314 FreeBSD/i386 compact demand paged
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>20 lelong <4096
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>>3 byte&0xC0 &0x80 shared library
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>>3 byte&0xC0 0x40 PIC object
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>>3 byte&0xC0 0x00 object
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>20 lelong >4095
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>>3 byte&0x80 0x80 dynamically linked executable
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>>3 byte&0x80 0x00 executable
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>16 lelong >0 not stripped
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# XXX gross hack to identify core files
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# cores start with a struct tss; we take advantage of the following:
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# byte 7: highest byte of the kernel stack pointer, always 0xfe
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# 8/9: kernel (ring 0) ss value, always 0x0010
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# 10 - 27: ring 1 and 2 ss/esp, unused, thus always 0
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# 28: low order byte of the current PTD entry, always 0 since the
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# PTD is page-aligned
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#
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7 string \357\020\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 FreeBSD/i386 a.out core file
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>1039 string >\0 from '%s'
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# /var/run/ld.so.hints
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# What are you laughing about?
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0 lelong 011421044151 ld.so hints file
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>4 lelong >0 (version %d)
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