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