~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
  M68000 Hi-Performance Microprocessor Division
  M68060 Software Package
  Production Release P1.00 -- October 10, 1994
  
  M68060 Software Package Copyright © 1993, 1994 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.
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  68060 INTEGER SOFTWARE PACKAGE (Library version)
  -------------------------------------------------
  
  The file ilsp.s contains the "Library version" of the
  68060 Integer Software Package. Routines included in this
  module can be used to emulate 64-bit divide and multiply,
  and the "cmp2" instruction. These instructions are not
  implemented in hardware on the 68060 and normally take
  exception vector #61 "Unimplemented Integer Instruction".
  
  By re-compiling a program that uses these instructions, and
  making subroutine calls in place of the unimplemented
  instructions, a program can avoid the overhead associated with
  taking the exception.
  
  Release file format:
  --------------------
  The file ilsp.sa is essentially a hexadecimal image of the
  release package. This is the ONLY format which will be supported.
  The hex image was created by assembling the source code and
  then converting the resulting binary output image into an
  ASCII text file. The hexadecimal numbers are listed
  using the Motorola Assembly Syntax assembler directive "dc.l"
  (define constant longword). The file can be converted to other
  assembly syntaxes by using any word processor with a global
  search and replace function.
  
  To assist in assembling and linking this module with other modules,
  the installer should add a symbolic label to the top of the file.
  This will allow calling routines to access the entry points
  of this package.
  
  The source code ilsp.s has also been included but only for
  documentation purposes.
  
  Release file structure:
  -----------------------
  The file ilsp.sa contains an "Entry-Point" section and a
  code section. The ILSP has no "Call-Out" section. The first section
  is the "Entry-Point" section. In order to access a function in the
  package, a program must "bsr" or "jsr" to the location listed
  below in "68060ILSP Entry Points" that corresponds to the desired
  function. A branch instruction located at the selected entry point
  within the package will then enter the correct emulation code routine.
  
  The entry point addresses at the beginning of the package will remain
  fixed so that a program calling the routines will not have to be
  re-compiled with every new 68060ILSP release.
  
  For example, to use a 64-bit multiply instruction,
  do a "bsr" or "jsr" to the entry point defined by
  the 060ILSP entry table. A compiler generated code sequence
  for unsigned multiply could look like:
  
  # mulu.l <ea>,Dh:Dl
  # mulu.l _multiplier,%d1:%d0
  
  	subq.l	&0x8,%sp	# make room for result on stack
  	pea	(%sp)		# pass: result addr on stack
  	mov.l	%d0,-(%sp)	# pass: multiplicand on stack
  	mov.l	_multiplier,-(%sp) # pass: multiplier on stack
  	bsr.l	_060LISP_TOP+0x18 # branch to multiply routine
  	add.l	&0xc,%sp	# clear arguments from stack
  	mov.l	(%sp)+,%d1	# load result[63:32]
  	mov.l	(%sp)+,%d0	# load result[31:0]
  
  For a divide:
  
  # divu.l <ea>,Dr:Dq
  # divu.l _divisor,%d1:%d0
  
  	subq.l	&0x8,%sp	# make room for result on stack
  	pea	(%sp)		# pass: result addr on stack
  	mov.l	%d0,-(%sp)	# pass: dividend hi on stack
  	mov.l	%d1,-(%sp)	# pass: dividend hi on stack
  	mov.l	_divisor,-(%sp) # pass: divisor on stack
  	bsr.l	_060LISP_TOP+0x08 # branch to divide routine
  	add.l	&0xc,%sp	# clear arguments from stack
  	mov.l	(%sp)+,%d1	# load remainder
  	mov.l	(%sp)+,%d0	# load quotient
  
  The library routines also return the correct condition code
  register value. If this is important, then the caller of the library
  routine must make sure that the value isn't lost while popping
  other items off of the stack.
  
  An example of using the "cmp2" instruction is as follows:
  
  # cmp2.l <ea>,Rn
  # cmp2.l _bounds,%d0
  
  	pea	_bounds		# pass ptr to bounds
  	mov.l	%d0,-(%sp)	# pass Rn
  	bsr.l	_060LSP_TOP_+0x48 # branch to "cmp2" routine
  	mov.w	%cc,_tmp	# save off condition codes
  	addq.l	&0x8,%sp	# clear arguments from stack
  
  Exception reporting:
  --------------------
  If the instruction being emulated is a divide and the source
  operand is a zero, then the library routine, as its last
  instruction, executes an implemented divide using a zero
  source operand so that an "Integer Divide-by-Zero" exception
  will be taken. Although the exception stack frame will not
  point to the correct instruction, the user will at least be able
  to record that such an event occurred if desired.
  
  68060ILSP entry points:
  -----------------------
  _060ILSP_TOP:
  0x000:	_060LSP__idivs64_
  0x008:	_060LSP__idivu64_
  
  0x010:	_060LSP__imuls64_
  0x018:	_060LSP__imulu64_
  
  0x020:	_060LSP__cmp2_Ab_
  0x028:	_060LSP__cmp2_Aw_
  0x030:	_060LSP__cmp2_Al_
  0x038:	_060LSP__cmp2_Db_
  0x040:	_060LSP__cmp2_Dw_
  0x048:	_060LSP__cmp2_Dl_