Re: [Tinycc-devel] Re: C67 Support

[Fabrice Bellard]

Peter "Firefly" Lund wrote:

> I don't know if elf even makes sense for C67 - I still have very little
> experience with it.  (and I haven't read the two manuals for it yet -
> I'll have to print them out at Uni)

ELF is very simple if no relocation are done. All we need is to define a 
correspondant machine id for TMS320C6xx.

> > elf generation for c67 should be very easy
> > especially if no DLLs are generated. Ideally, target endianness should
> > also be selectable (what about big endian x86 ? :-)).
>
>
> I would /love/ that.  Did you see my idea for having selectable integer
> and pointer sizes?

Ok for pointer and longs (it is needed for 64 bit CPUs). For ints I am 
not sure it is useful and it would be more complicated.

Do you agree that only compile time selection is needed for that ?

> > Note that my new project is a high performance portable Linux CPU user
> > space emulator.
>
>
> Interesting.  What is wrong with bochs and valgrind? ;)

Bochs is incredibly slow and written in C++. valgrind is not portable 
and does not emulate full user mode (in particular full selector support 
and vm86 mode are missing). My CPU emulator is fast (it is a JIT as 
valgrind) and portable (I use some GCC tricks to avoid writing any code 
generator). The main limitation is that only user space Linux is emulated.

> Emulators are fun, but I think the world needs a usable Linux debugger
> more (which is what I'm working on).

Interesting. A good emulator will be useful if you want higher level 
debugging (think of execution trace recording/single step backward).

Fabrice.