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Implement a rather gross hack to identify i386 a.out core files.

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Takes advantage of some bytes in our current tss structure that
reliably have particular values (due to our current architecture or
CPU requirements).
This commit is contained in:
Joerg Wunsch 1995-09-21 20:10:52 +00:00
parent 25f26ad85a
commit 449c6a18c2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=10945
1 changed files with 10 additions and 0 deletions
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usr.bin/file/Magdir/freebsd
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@ -14,3 +14,13 @@
0 lelong 000000407 impure format
>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 i386 a.out core file
>1047 string >\0 from "%s"