From: sandmann AT clio DOT rice DOT edu (Charles W. Sandmann)
Subject: Re: -pg profiling bug again
To: S_Eckart AT lis DOT e-technik DOT tu-muenchen DOT de (Stefan Eckart)
Date: Mon, 17 Jan 1994 16:01:26 -0600 (CST)
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu

> !	movw	%ds,%cs:__ds_sav

don't do this.  CS is not writable.  And CS=DS in this routine, so 
	movw	%ds, __ds_sav
Is good enough.  And beware - GAS sometimes eats segment overrides, so 
check the code with edebug32 before running.  for example:
> !	movw	%cs:__ds_sav,%ds
May actually end up looking like:
	mov2	__ds_sav, %ds
Just be careful.  You might have to use a .byte command to make sure the
override is there.  You need to put the restore of ds before checking
mcount_skip, however, or you might be checking garbage (or put a CS override
there also).