Subject: bin/1910: /etc/magic changes for SGI MIPSLE-LE ECOFF inconsistent with Ultrix
To: None <firstname.lastname@example.org>
From: Jonathan Stone <jonathan@DSG.Stanford.EDU>
Date: 01/07/1996 08:20:47
>Synopsis: magdir/sgi changes for SGI/mips wrong for pmax LE mips
>Responsible: bin-bug-people (Utility Bug People)
>Arrival-Date: Sun Jan 7 11:50:13 1996
>Originator: Jonathan Stone
>Release: NetBSD-current at 1995-12-22
System: NetBSD Reno.DSG.Stanford.EDU 1.1A NetBSD 1.1A (NEWCONF) #20: Sun Jan 7 05:21:40 PST 1996 jonathan@Reno.DSG.Stanford.EDU:/usr/src/sys/arch/pmax/compile/NEWCONF pmax
NetBSD's pmax port runs on a little-endian MIPS machine (Decstations).
The NetBSD /usr/bin/file command used to correctly identify such
binaries as being Ultrix/pmax ECOFF binaries.
It appears that someone incorporated file-1.37.
This version of file has support for SGI (big-endian mips) magic numbers.
Supporting SGI magic numbers is laudable. However, whoever wrote this
(presumably for file-1.3&) apparently didn't realize that those magic
numbers are inappropriate (or wrong) for little-endian MIPS machines.
Indeed, the comments in magdir/sgi say as much: it's correct for
SGI's big-endian product line.
On NetBSD/pmax, identification of Ultrix/mips (little-endian files),
which now appear as being
MIPSEL-LE COFF executable (paged) stripped - version 10.2
which is bogus in several ways:
1. The name is wrong. These are ECOFF binaries, not COFF.
(that applies to the other mips COFF binaries, too.)
2. The name MIPSEL-LE is bogus, or at least big-endian
biased. The corresponding name in /etc/magic for big-endian
header, big-endian content ECOFF binaries is "MIPSEB".
The appropriate name for little-endian-header, little-endian
content mips/ecoff files should be "MIPSEL", not "MIPSEL-LE".
HOwever, the /etc/magic entry uses "MIPSEL" to mean big-endian
header, little-endian content.
Surely, if native big-endian ECOFF mips files are "MIPSEB",,
native little-endian ECOFF mips files should be "MIPSEL".
3. The version number for native-little-endian ecoff appears
byte-swapped; it should be 2.10, not 10.2.
The comment in /etc/magic saying changes need to be
made to src/cmd/file/magdir should be altered for NetBSD, where
the source is in /usr/src/bin/file/magdir.
The following should be submitted to the maintainers of file:
Rename magdir/sgi to magdir/mips, since SGI is not the only vendor
of MIPS chips.
Change all occurences of COFF to ECOFF in magdir/mips.
Change all occurences of "MIPSEL" to "MIPSEL-BE" in magdir/mips.
(It's not clear to me that "MIPSEB-LE" and "MIPSEL-BE" are the
right way around.)
Change all occurences of "MIPSEL-LE" to "MIPSEL" in magdir/mips.