/*
#
# $NetBSD: inetbsd.S,v 1.5 2024/05/13 00:10:06 msaitoh 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.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Derived from:
# iskeleton.s
#
# This file contains:
# (1) example "Call-out"s
# (2) example package entry code
# (3) example "Call-out" table
#
/*
#
# _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".
#
*/
ASENTRY_NOPROFILE(_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 Instruction
# stack frame and branches to this routine.
#
*/
ASENTRY_NOPROFILE(_060_real_chk)
tstb %sp@ |# is tracing enabled?
bpls real_chk_end |# no
/*
#
# CHK FRAME TRACE FRAME
# ***************** *****************
# * Current PC * * Current PC *
# ***************** *****************
# * 0x2 * 0x018 * * 0x2 * 0x024 *
# ***************** *****************
# * Next * * Next *
# * PC * * PC *
# ***************** *****************
# * SR * * SR *
# ***************** *****************
#
*/
moveb #0x24,%sp@(0x7) |# set trace vecno
bral _ASM_LABEL(_060_real_trace)
real_chk_end:
jmp _C_LABEL(chkinst)
/*
#
# _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.
#
*/
ASENTRY_NOPROFILE(_060_real_divbyzero)
tstb %sp@ |# is tracing enabled?
bpls real_divbyzero_end |# no
/*
#
# DIVBYZERO FRAME TRACE FRAME
# ***************** *****************
# * Current PC * * Current PC *
# ***************** *****************
# * 0x2 * 0x014 * * 0x2 * 0x024 *
# ***************** *****************
# * Next * * Next *
# * PC * * PC *
# ***************** *****************
# * SR * * SR *
# ***************** *****************
#
*/
moveb #0x24,%sp@(0x7) |# set trace vecno
bral _ASM_LABEL(_060_real_trace)
real_divbyzero_end:
jmp _C_LABEL(zerodiv)
|###########################
/*
#
# _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.
#
*/
ASENTRY_NOPROFILE(_060_real_cas)
bral _C_LABEL(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.
#
*/
ASENTRY_NOPROFILE(_060_real_cas2)
bral _C_LABEL(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
#
*/
ASENTRY_NOPROFILE(_060_real_lock_page)
clrl %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
#
*/
ASENTRY_NOPROFILE(_060_real_unlock_page)
clrl %d0
rts
