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kernel: catch execution read fault on SG_NOEXEC segment (for mips)

--- a/sys/src/9/sgi/faultmips.c

+++ b/sys/src/9/sgi/faultmips.c

@@ -196,7 +196,7 @@

 /*	print("fault: %s code %d va %#p pc %#p r31 %#lux tlbvirt %#lux\n",

 		up->text, code, ur->badvaddr, ur->pc, ur->r31, tlbvirt());/**/

-	if (Debug && ckfaultstuck(ur, read, code) || fault(addr, read) == 0)

+	if (Debug && ckfaultstuck(ur, read, code) || fault(addr, ur->pc, read) == 0)

 		return;

 	if(user) {