On 10/10/07, Fabrice Bellard <[EMAIL PROTECTED]> wrote: > Thiemo Seufer wrote: > > Fabrice Bellard wrote: > >> J. Mayer wrote: > >>> Following the patches done for elfload32, it appeared to me that there > >>> were still problems that would prevent 32 bits executables to run on 64 > >>> bits target in linux user mode emulation. > >>> [...] > >> Are you sure it is a good idea to try to add 32 bit executable support to a > >> 64 bit target ? In the end you will need to write a 64 bit to 32 bit linux > >> syscall converter which would mean duplicating all the linux-user code of > >> the corresponding 32 bit target (think of ioctls with strutures, signals > >> frames, etc...). > > > > I would think this feature will be limited to platforms which can handle > > 32bit and 64bit binaries with a single personality. > > I am not sure it is a common case ! > > However, I suggest to emulate a 32 bit user linux system with a 64 bit > guest CPU running in 32 bit compatibily mode. It would be useful to test > 64 bit CPUs in 32 bit compatibility mode. The only required modification > in linux user is to rename target_ulong so that it can have a different > size of the CPU word default size.
I think this would be sufficient for the Sparc and this way there would be no need to convert the structures. Brilliant! Should we revert the elfload32 patch? What about PPC?