Re: [PATCH]: Make Sparc Target Multi-Arch

[Michael Snyder <msnyder at cygnus dot com>]

Jim Blandy wrote:
> 
> > > What if I write the return struct size to the entry point address,
> > > following the trap instruction, and remove it when finished
> > > (like the trap instruction)?
> >
> > This will not work with nested user calls (breakpoint at called function,
> > stop there, call another user function [returning a struct :-)]).
> > It might be dangerous as well, as the entry point might just contain
> > a jump, and you might clobber code which will be called during the user
> > function (unlikely, but possible).
> [...]
> Alternatively, if we're using generic dummy frames, we could put each
> breakpoint / return size at a new address.  A synthetic call nested N
> deep would store its return breakpoint at ENTRY_POINT + K*N, for the
> appropriate value of K.

That would lose as soon as K*N > sizeof(entry_function), 'cause
then we might be putting call_dummy breakpoints in code that 
might be called.