[davidm@napali.hpl.hp.com: Re: [PATCH] i386 vsyscall DSO implementation]

[Jim Wilson]

The patch looks OK to me.  Normally this works because unwind info and 
text end up in the same segment.  If they end up in different segments, 
then it matters whether we use the segment containing the reloc, or the 
segment containing the symbol.  This stuff was written by me, and I 
didn't really know what I was doing at the time.

There does seem to be a technicality here though.  The IPF psabi says 
that the reloc is valid only if the symbol and reloc end up in the same 
segment, but they are in different segments here, so technically this is 
invalid.  However, there is no problem making this work because the two 
segments have fixed load addresses, so the offsets between the two 
segments will never change.  If one of the segments could be loaded at a 
different address, then the offset would change, and the unwind info 
would be incorrect.

Jim