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- From: terry@cs.weber.edu (A Wizard of Earth C)
- Subject: Re: 386bsd and AT&T SVR4 compatibility
- Message-ID: <1992Dec28.224810.8500@fcom.cc.utah.edu>
- Sender: news@fcom.cc.utah.edu
- Organization: Weber State University (Ogden, UT)
- References: <1992Dec22.121831.4481@ghost.dsi.unimi.it> <111@knobel.GUN.de>
- Date: Mon, 28 Dec 92 22:48:10 GMT
- Lines: 46
-
- In article <111@knobel.GUN.de> andreas@knobel.GUN.de (Andreas Klemm) writes:
- >In <1992Dec22.121831.4481@ghost.dsi.unimi.it> marelli@ghost.dsi.unimi.it (Paolo Marelli) writes:
- >
- >| I'm very interested in obtain some information about
- >| compatibility between 386bsd an AT&T SVR4 or similar
- >| unix version like Consensys.
- >
- >| Do the excutables use the same format ?
- >
- >System V Rel.: 4 ELF-format
- > supports COFF as well
- >
- >386bsd: a.out format.
- >
- >No way to exchange binaries between 386bsd and traditional SYSV Systems.
-
- One fairly easy way to do this at some time in the future is to modify
- the loader to recognize the magic numbers from ELF/COFF binaries (and
- x.out, if we want xenix compatability) and index the system calls out
- of a pointer in the proc struct for the current process rather than
- out of a single system-wide array. The kern_exec would be altered to
- set the pointer appropriately based on the magic number; then the only
- remaining exercise is to make sure there are emulation system calls
- which act as expected for each set of system calls supported (in many
- cases, no changes would be directly necessary). A particular sticking
- point may be things like parameters to ioctl's if the numbers do not
- match between the target system being emulated and BSD. In particular,
- anything doing device I/O which depends on baud rates or terminal
- settings would require an "emulation" module based on the constants
- from the target systems header files.
-
- But this is definitely doable, and is probably worthwhile in the long
- run, since it will yield an existing commercial software base.
-
-
- Terry Lambert
- terry@icarus.weber.edu
- terry_lambert@novell.com
- ---
- Any opinions in this posting are my own and not those of my present
- or previous employers.
- --
- -------------------------------------------------------------------------------
- "I have an 8 user poetic license" - me
- Get the 386bsd FAQ from agate.berkeley.edu:/pub/386BSD/386bsd-0.1/unofficial
- -------------------------------------------------------------------------------
-