For completeness (but of course perfectly unhelpful to you): This was not an issue on our MIPS kernel (which supports 32-bit binaries on the 64-bit kernel) because we removed indirect strings a while ago.
Gernot
On Sat, 28 Apr 2007 10:58:58 -0400, "Jonathan S. Shapiro" shap@eros-os.com said:
JSS> On amd64 (and other architectures), multiple execution models are JSS> supported by the hardware. In the case of amd64, both 64-bit and 32-bit JSS> applications can be supported simultaneously.
JSS> IPC across models presents some problems.
JSS> When sending from 32-bit to 64-bit, registers are widened (good), but JSS> differences in alignment rules can mean that the 64-bit receiver and JSS> the 32-bit sender do not agree about the number and lengths of JSS> indirect strings.
JSS> When sending from 64-bit to 32-bit, registers are truncated, and there JSS> can be difficulties with indirect strings because of differing JSS> alignment requirements.
JSS> It is definitely possible for the IDL compiler to compile for both JSS> models, and to generate cross-model calls that will avoid these JSS> problems, but I have not found any "clean" solution.
JSS> On platforms that support multiple execution architectures, how do L4 JSS> systems deal with this?
JSS> If this is discussed in existing documents (perhaps the IDL compiler JSS> manual?) a pointer to the document is sufficient.
JSS> Thanks!
JSS> -- JSS> Jonathan S. Shapiro, Ph.D. JSS> Managing Director JSS> The EROS Group, LLC
JSS> _______________________________________________ JSS> l4-hackers mailing list JSS> l4-hackers@os.inf.tu-dresden.de JSS> http://os.inf.tu-dresden.de/mailman/listinfo/l4-hackers