who called a C routine - get it from the stack frame

[Walt Pesch]

This is what I get for looking at too many 3B crash dumps - it gets to
you after a while.  Y'all are right, the stack frame is not only
dependant on the OS but also very much machine specific.  For AT&T SV
releases on the 3B line, the Stack Frame does look like what I showed, 
and it does grow downwards in memory (i.e. the stack pointer is
incremented in a push operation).  For the AT&T System V on the Vax, 
it still looks the same but grows upwards in memory (i.e. the stack
pointer is decremented in a puch operation).  For anything else, my 
advice would be to get into crash and dump the stack for a couple of 
procs and figure it out yourself.  If you're lucky, the stack dump
will also contain a pretty picture showing yoy exactly what to look
for.


   Walt Pesch
   {ihnp4,akgua,et al}!cuuxb!wbp
   cuuxb!wbp at lll-crg