.data.asciz "@(#) low.s 1.1 92/07/30".even.text| Copyright (C) 1986 by Sun Microsystems, Inc.#include <machlwp/low.h>#include "assym.s".text.globl	___schedule.globl 	_splclock.globl 	_splx.globl	___asmdebug.globl	___Curproc.globl	___NuggetSP|| assembly language support routines|| a7 is the stack| __swtch()| switch context when not at interrupt level and the new process| was not switched out asynchronously.| Volatile registers are not restored (d0/d1, a0/a1).|ENTRY(swtch)	jbsr	_splclock	movl	___Curproc, a0		| pointer to client context	moveml	a0@(REGOFFSET), #0xfcfc	| restore client regs and new sp	movl	d0, sp@-	jbsr	_splx	addql	#4, sp1:	rts				| back to client| __checkpoint()| Save context and reschedule.| The context will have the return address of the caller of| ___checkpoint on the stack so upon rescheduling it will look| like checkpoint() just returned.ENTRY(checkpoint)	jbsr	_splclock	movl	___Curproc, a0	moveml	#0xfcfc, a0@(REGOFFSET)	| save volatile registers	movl	___NuggetSP, sp		| don't use client stack now	movl	d0, sp@-	jbsr	_splx	addql	#4, sp	jra	___schedule	| NOTREACHED| __setstack()| give the nugget a stack to use when no lwps are runningENTRY(setstack)	movl	sp@, a0			| save return address	movl	___NuggetSP, sp		| switch stacks	jra	a0@			| ...and return to caller