[TUHS] v6tar from v7 on v6, too large?

Will Senn will.senn at gmail.com
Thu Dec 10 03:55:06 AEST 2015

On 12/8/15 10:53 PM, Noel Chiappa wrote:
>      > From: Will Senn <will.senn at gmail.com>
>      > The problem is this, when I attempt to execute the v6tar binary on the
>      > v6 system (it works in v7) it errors out:
>      > v6tar
>      > v6tar: too large
> That's an error message from the shell; the exec() call on the command
> ('v6tar') is returning an ENOMEM error. Looking in the kernel, that comes from
> estabur() in main.c; there are a number of potential causes, but the most
> likely is that 'v6tar' is linked to be split I+D, and your V6 emulation is on
> a machine that doesn't have split I+D (e.g. an 11/40). If that's not it,
> please dump the a.out header of 'v6tar', so we can work out what's causing the
> 	Noel

I followed the thread you provided and I appreciate the direction. 
estabur(who thought these names up, I know 8 characters is limiting, but 
c'mon) is indeed the culprit:
         if(sep) {
                 if(cputype == 40)
                         goto err;

I'm gathering (read still investigating) that the 411 header is read by 
a loader and the call to estabur is made with a value for sep indicating 
that it is a split I+D binary, then the cputype is checked and sure 
enough, it's a PDP-11/40 and the error is generated.



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