Re: [Qemu-devel] [PATCH] Updated Sparc support

[Johan Rydberg]

David wrote:

> Like PPC, I now hold all the main x86 registers (EAX etc.) in Sparc
> registers.  This was tricky to accomplish with register windows, but
> finally it works...

Do you still use the register windows, or does GCC generate code without
save/restore?  Is this possible, really?

The reason for me asking is that I some time soon "port" my simulator 
[1]
to SPARC hosts, and it needs to have a lot of global registers (more 
than
those 6-7 available).  I

> +ifeq ($(ARCH),sparc)
> +CFLAGS+=-m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
> +LDFLAGS+=-m32
> +OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
> +endif
> +
> +ifeq ($(ARCH),sparc64)
> +CFLAGS+=-m64 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
> +LDFLAGS+=-m64
> +OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
> +endif

Is the fixed flags really needed or is it just because the global
register definitions is made in op-i386.c (or whatever) ?

brgds,
johan

[1] http://www.nongnu.org/guss/