"H . J . Lu" [off-list ref] writes:

I don't see there are any registers we can use without breaking ABI.
On the other hand, can we change the mips kernel to save k0 or k1 for
user space?

Are these registers which are readable by normal users but writable
only in ring 0?  If yes, this is definitely worthwhile (similar to how
x86 works).  The only problem will be the MIPS variants which don't
have this register.  I bet there are some.

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