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Initial revision

#
# $OpenBSD: iskeletn.s,v 1.2 1996/05/30 22:14:43 niklas Exp $
# $NetBSD: iskeletn.s,v 1.2 1996/05/15 19:48:41 is Exp $
#

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
# M68000 Hi-Performance Microprocessor Division
# M68060 Software Package Production Release 
# 
# M68060 Software Package Copyright (C) 1993, 1994, 1995, 1996 Motorola Inc.
# All rights reserved.
# 
# THE SOFTWARE is provided on an "AS IS" basis and without warranty.
# To the maximum extent permitted by applicable law,
# MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
# INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS
# FOR A PARTICULAR PURPOSE and any warranty against infringement with
# regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
# and any accompanying written materials. 
# 
# To the maximum extent permitted by applicable law,
# IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
# (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
# BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
# ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
# 
# Motorola assumes no responsibility for the maintenance and support
# of the SOFTWARE.  
# 
# You are hereby granted a copyright license to use, modify, and distribute the
# SOFTWARE so long as this entire notice is retained without alteration
# in any modified and/or redistributed versions, and that such modified
# versions are clearly identified as such.
# No licenses are granted by implication, estoppel or otherwise under any
# patents or trademarks of Motorola, Inc.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

#
# iskeleton.s
#
# This file contains:
#	(1) example "Call-out"s
#	(2) example package entry code
#	(3) example "Call-out" table
#


#################################
# (1) EXAMPLE CALL-OUTS 	#
#				#
# _060_isp_done()		#
# _060_real_chk()		#
# _060_real_divbyzero()		#
#				#
# _060_real_cas()		#
# _060_real_cas2()		#
# _060_real_lock_page()		#
# _060_real_unlock_page()	#
#################################

#
# _060_isp_done():
#
# This is and example main exit point for the Unimplemented Integer
# Instruction exception handler. For a normal exit, the 
# _isp_unimp() branches to here so that the operating system
# can do any clean-up desired. The stack frame is the
# Unimplemented Integer Instruction stack frame with
# the PC pointing to the instruction following the instruction
# just emulated.
# To simply continue execution at the next instruction, just
# do an "rte".
#
	global		_060_isp_done
_060_isp_done:
	rte

#
# _060_real_chk():
#
# This is an alternate exit point for the Unimplemented Integer
# Instruction exception handler. If the instruction was a "chk2"
# and the operand was out of bounds, then _isp_unimp() creates
# a CHK exception stack frame from the Unimplemented Integer Instrcution
# stack frame and branches to this routine.
#
	global		_060_real_chk
_060_real_chk:
	tst.b		(%sp)			# is tracing enabled?
	bpl.b		real_chk_end		# no

#
#	    CHK FRAME		   TRACE FRAME
#	*****************	*****************
#	*   Current PC	*	*   Current PC	*
#	*****************	*****************
#	* 0x2 *  0x018	*	* 0x2 *  0x024	*
#	*****************	*****************
#	*     Next	*	*     Next	*
#	*      PC	*	*      PC	*
#	*****************	*****************
#	*      SR	*	*      SR	*
#	*****************	*****************
#
	mov.b		&0x24,0x7(%sp)		# set trace vecno
	bra.l		_060_real_trace

real_chk_end:
	rte

#
# _060_real_divbyzero:
#
# This is an alternate exit point for the Unimplemented Integer 
# Instruction exception handler isp_unimp(). If the instruction is a 64-bit
# integer divide where the source operand is a zero, then the _isp_unimp() 
# creates a Divide-by-zero exception stack frame from the Unimplemented
# Integer Instruction stack frame and branches to this routine.
#
# Remember that a trace exception may be pending. The code below performs
# no action associated with the "chk" exception. If tracing is enabled,
# then it create a Trace exception stack frame from the "chk" exception
# stack frame and branches to the _real_trace() entry point.
# 
	global		_060_real_divbyzero
_060_real_divbyzero:
	tst.b		(%sp)			# is tracing enabled?
	bpl.b		real_divbyzero_end	# no

#
#	 DIVBYZERO FRAME	   TRACE FRAME
#	*****************	*****************
#	*   Current PC	*	*   Current PC	*
#	*****************	*****************
#	* 0x2 *  0x014	*	* 0x2 *  0x024	*
#	*****************	*****************
#	*     Next	*	*     Next	*
#	*      PC	*	*      PC	*
#	*****************	*****************
#	*      SR	*	*      SR	*
#	*****************	*****************
#
	mov.b		&0x24,0x7(%sp)		# set trace vecno
	bra.l		_060_real_trace

real_divbyzero_end:
	rte

###########################

#
# _060_real_cas():
#
# Entry point for the selected cas emulation code implementation.
# If the implementation provided by the 68060ISP is sufficient,
# then this routine simply re-enters the package through _isp_cas.
#
	global		_060_real_cas
_060_real_cas:
	bra.l		_I_CALL_TOP+0x80+0x08

#
# _060_real_cas2():
#
# Entry point for the selected cas2 emulation code implementation.
# If the implementation provided by the 68060ISP is sufficient,
# then this routine simply re-enters the package through _isp_cas2.
#
	global		_060_real_cas2
_060_real_cas2:
	bra.l		_I_CALL_TOP+0x80+0x10

#
# _060_lock_page():
#
# Entry point for the operating system's routine to "lock" a page
# from being paged out. This routine is needed by the cas/cas2
# algorithms so that no page faults occur within the "core" code
# region. Note: the routine must lock two pages if the operand 
# spans two pages.
# NOTE: THE ROUTINE SHOULD RETURN AN FSLW VALUE IN D0 ON FAILURE
# SO THAT THE 060SP CAN CREATE A PROPER ACCESS ERROR FRAME.
# Arguments:
#	a0 = operand address
#	d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
#	d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
# Expected outputs:
#	d0 = 0 -> success; non-zero -> failure
#
	global		_060_real_lock_page
_060_real_lock_page:
	clr.l		%d0
	rts

#
# _060_unlock_page():
#
# Entry point for the operating system's routine to "unlock" a
# page that has been "locked" previously with _real_lock_page.
# Note: the routine must unlock two pages if the operand spans
# two pages.
# Arguments:
# 	a0 = operand address
#	d0 = `xxxxxxff -> supervisor; `xxxxxx00 -> user
#	d1 = `xxxxxxff -> longword; `xxxxxx00 -> word
#
	global		_060_real_unlock_page
_060_real_unlock_page:
	clr.l		%d0
	rts

############################################################################

##################################
# (2) EXAMPLE PACKAGE ENTRY CODE #
##################################

	global		_060_isp_unimp
_060_isp_unimp:
	bra.l		_I_CALL_TOP+0x80+0x00

	global		_060_isp_cas
_060_isp_cas:
	bra.l		_I_CALL_TOP+0x80+0x08

	global		_060_isp_cas2
_060_isp_cas2:
	bra.l		_I_CALL_TOP+0x80+0x10

	global		_060_isp_cas_finish
_060_isp_cas_finish:
	bra.l		_I_CALL_TOP+0x80+0x18

	global		_060_isp_cas2_finish
_060_isp_cas2_finish:
	bra.l		_I_CALL_TOP+0x80+0x20

	global		_060_isp_cas_inrange
_060_isp_cas_inrange:
	bra.l		_I_CALL_TOP+0x80+0x28

	global		_060_isp_cas_terminate
_060_isp_cas_terminate:
	bra.l		_I_CALL_TOP+0x80+0x30

	global		_060_isp_cas_restart
_060_isp_cas_restart:
	bra.l		_I_CALL_TOP+0x80+0x38

############################################################################

################################
# (3) EXAMPLE CALL-OUT SECTION #
################################

# The size of this section MUST be 128 bytes!!!

	global	_I_CALL_TOP
_I_CALL_TOP:
	long	_060_real_chk		- _I_CALL_TOP
	long	_060_real_divbyzero	- _I_CALL_TOP
	long	_060_real_trace		- _I_CALL_TOP
	long	_060_real_access	- _I_CALL_TOP
	long	_060_isp_done		- _I_CALL_TOP

	long	_060_real_cas		- _I_CALL_TOP
	long	_060_real_cas2		- _I_CALL_TOP
	long	_060_real_lock_page	- _I_CALL_TOP
	long	_060_real_unlock_page	- _I_CALL_TOP

	long	0x00000000, 0x00000000, 0x00000000, 0x00000000
	long	0x00000000, 0x00000000, 0x00000000

	long	_060_imem_read		- _I_CALL_TOP
	long	_060_dmem_read		- _I_CALL_TOP
	long	_060_dmem_write		- _I_CALL_TOP
	long	_060_imem_read_word	- _I_CALL_TOP
	long	_060_imem_read_long	- _I_CALL_TOP
	long	_060_dmem_read_byte	- _I_CALL_TOP
	long	_060_dmem_read_word	- _I_CALL_TOP
	long	_060_dmem_read_long	- _I_CALL_TOP
	long	_060_dmem_write_byte	- _I_CALL_TOP
	long	_060_dmem_write_word	- _I_CALL_TOP
	long	_060_dmem_write_long	- _I_CALL_TOP

	long	0x00000000
	long	0x00000000, 0x00000000, 0x00000000, 0x00000000

############################################################################

# 060 INTEGER KERNEL PACKAGE MUST GO HERE!!!