Re: [Qemu-devel] qemu-system-sparc question?

[Blue Swirl]

> There's no such think as an Ideal cpu. It's like picking the right
> religion :-) If you want a toy cpu, there are things like mmix.

In general true. But the real and toy CPUs are designed with the hardware 
construction in mind, whereas the limitations deriving from HW (number of 
registers, number of instructions, instruction complexity) may be less 
relevant in the Qemu case. Also Qemu could benefit from getting information 
analysed from the source code that no real HW needs. For example, perhaps 
the TB state could be managed explicitly by the compiler.

Though I doubt the near native speed performance with kqemu can ever be 
exceeded with a translator even with all compiler assistance tricks. For 
other goals (like enhancing security), different methods could be tried, for 
example it's hard for virus writers to target a dynamic or even encrypted 
instruction set. Or make stack exploits difficult by giving the CPU separate 
stack pointers for function arguments, return addresses and local variables.

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