[PATCH] Add support for scanf, gets in h8300 simulator
Dhananjay R. Deshpande
Fri May 17 03:23:00 GMT 2002
> >Syscalls are usually handled a little differently. Have you considered
> >keeping the O_SYSCALL macro as is, and passing the syscall number to the
> >simulator in a designated register or memory location? Then in the
> >simulator in compile.c, replace the sim_callback->write_stdout call with
> >a switch statement that calls the appropriate sim_callback based on the
> >contents of the "syscall" register.
> I had implemented it in the same way earlier but passing syscall number as parameter >makes simulator incompatible with previous builds of toolchain. This is because the
>current implementation of _write syscall is not passing syscall number as parameter.
>Any suggestion about this?
>This change would only make previous versions of newlib (and binaries
>linked with them) incompatible with the new simulator. So people with
>old binaries can either use an older simulator, or recompile newlib and
>relink their programs. Either way, IMO it's not too much to ask in
>return for new syscalls.
>Alternatively, you could keep your O_SYSCALL_WRITE, and change your
>O_SYSCALL_READ to O_SYSCALL_GENERIC. Then all new syscalls would use
>the generic method, and old binaries would keep working.
I have implemented this alternative. Submitting patch again in separate email.
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