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#
# $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!!!
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