fb97e58e5c
Rather than trying to blacklist which bits userland can't write to via sigreturn() or setcontext(), only permit changes to whitelisted bits. - Permit arbitrary writes to bits in the user-writable USTATUS register that shadows SSTATUS. - Ignore changes in write-only bits maintained by the CPU. - Ignore the user-supplied value of the FS field used to track floating point state and instead set it to a value matching the actions taken by set_fpcontext(). Discussed with: mhorne MFC after: 2 weeks Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D23338
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