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

From: Johan Rydberg
Subject: Re: [Qemu-devel] [PATCH] Updated Sparc support
Date: Thu, 15 May 2003 15:03:33 +0200

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

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


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

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