29 Oct
2019
29 Oct
'19
3:48 a.m.
Robert Clausecker <fuz(a)fuz.su>wrote:
The one thing in this chain I have never found is an
AT&T style
assembler for x86 before ELF was introduced.
There were alot of AT&T codebase ports to x86 architecture except Xenix:
Microport, INTERACTIVE, Everex, Wyse e.t.c. using AT&T x86 syntax.
I've tried Microport SystemV /386 (SysV R3.2). It uses COFF
as format for executables:
See:
http://www.vcfed.org/forum/showthread.php?67736-History-behind-the-disk-ima…
(Rather interesting kernel ABI/Call convention)
and
https://gunkies.org/wiki/Unix_SYSVr3
There were also SystemV R2 to i286 ports i.e.:
https://gunkies.org/wiki/Microport_System_V
with a.out binary format.
29 Oct
29 Oct
3:59 a.m.
Hi Alexander,
On Tue, Oct 29, 2019 at 12:48:29AM +0300, Alexander Voropay wrote:
Robert Clausecker <fuz(a)fuz.su>wrote:
Nice find! It seems to use lcall to selector 7 for system calls. A
similar choice was made in 386BSD all the way through FreeBSD 2.2.8
where it was replaced with int $0x80 as in Linux.
The one thing in this chain I have never found is
an AT&T style
assembler for x86 before ELF was introduced.
There were alot of AT&T codebase ports to x86 architecture except Xenix:
Microport, INTERACTIVE, Everex, Wyse e.t.c. using AT&T x86 syntax.
I've tried Microport SystemV /386 (SysV R3.2). It uses COFF
as format for executables:
See:
http://www.vcfed.org/forum/showthread.php?67736-History-behind-the-disk-ima…
(Rather interesting kernel ABI/Call convention) and
https://gunkies.org/wiki/Unix_SYSVr3
There were also SystemV R2 to i286 ports i.e.:
https://gunkies.org/wiki/Microport_System_V
with a.out binary format.
I'll have a look at that.
Thank you for the help!
Yours,
Robert Clausecker
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Robert Clausecker