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pc64: return up in RUSER (BP) for devproc kregs file

--- a/sys/src/9/pc64/mkfile

+++ b/sys/src/9/pc64/mkfile

@@ -143,7 +143,7 @@

 	aux/na $prereq > $target

 acid:V:

-	$CC -a -w -I. -. ../pc/i8253.c>acid

+	$CC -a -w main.c>acid

 %.clean:V:

 	rm -f $stem.c [9bz]$stem [9bz]$stem.gz boot$stem.* apbootstrap.h init.h $PCHEADERS

--- a/sys/src/9/pc64/trap.c

+++ b/sys/src/9/pc64/trap.c

@@ -1051,6 +1051,7 @@

 {

 	ureg->pc = p->sched.pc;

 	ureg->sp = p->sched.sp+8;

+	ureg->r14 = (uintptr)p;

 }

 uintptr