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

[Josef W. <Jos...@gm...>]

On Saturday 16 November 2002 19:17, Jeremy Fitzhardinge wrote:
> On Sat, 2002-11-16 at 04:09, Julian Seward wrote:
> ...
> > When an unchained translation wants to make a jump to a known
> > (orig)address, it pushes the orig-address it wants to call, and *call=
s*
> > "patch_me" which is a short piece of assembly code.  This pops the ar=
gs
> > (orig-addr) and also pops the return address -- which points just aft=
er
> > the call insn on the original translation.  patch_me can arrange to f=
ind
> > the translation and patch the caller to jump directly to it.

Just an idea: Why not simply use indirect jumps and patching the jump add=
ress,=20
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=20
translated code (by patch_me).
You wouldn't need chained/unchained versions or patching generated code, =
and=20
whenever discarding a translation, set the according jump address back to=
=20
"patch_me".
Seems way easier for me in a first step.

Sorry if I'm totally wrong here :-)

Josef