Re: [Valgrind-developers] Re: basic block chaining

[Julian S. <js...@ac...>]

> > > When an unchained translation wants to make a jump to a known
> > > (orig)address, it pushes the orig-address it wants to call, and *calls*
> > > "patch_me" which is a short piece of assembly code.  This pops the args
> > > (orig-addr) and also pops the return address -- which points just after
> > > the call insn on the original translation.  patch_me can arrange to
> > > find the translation and patch the caller to jump directly to it.
>
> Just an idea: Why not simply use indirect jumps and patching the jump
> address, same as the symbol resolving with calls to shared lib functions is
> doing? The jump address would be initialised to "patch_me" and later to the
> translated code (by patch_me).
> You wouldn't need chained/unchained versions or patching generated code,
> and whenever discarding a translation, set the according jump address back
> to "patch_me".
> Seems way easier for me in a first step.

Josef

I don't really know how the shared lib stuff works.  Can you explain
in a little more detail how your proposal would work?  Thanks,

J