John Baldwin 274c0a806a Enable use of a global shared page for RISC-V.
machine/vmparam.h already defines the SHAREDPAGE constant.  This
change just enables it for ELF executables.  The only use of the
shared page currently is to hold the signal trampoline.

Reviewed by:	markj, kib
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D17875
2018-11-07 18:27:43 +00:00
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