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Fixed MTP to work with TWRP
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arch/m68k/ifpsp060/ilsp.doc
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arch/m68k/ifpsp060/ilsp.doc
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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M68000 Hi-Performance Microprocessor Division
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M68060 Software Package
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Production Release P1.00 -- October 10, 1994
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M68060 Software Package Copyright © 1993, 1994 Motorola Inc. All rights reserved.
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THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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To the maximum extent permitted by applicable law,
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MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
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and any warranty against infringement with regard to the SOFTWARE
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(INCLUDING ANY MODIFIED VERSIONS THEREOF) and any accompanying written materials.
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To the maximum extent permitted by applicable law,
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IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
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BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR OTHER PECUNIARY LOSS)
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ARISING OF THE USE OR INABILITY TO USE THE SOFTWARE.
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Motorola assumes no responsibility for the maintenance and support of the SOFTWARE.
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You are hereby granted a copyright license to use, modify, and distribute the SOFTWARE
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so long as this entire notice is retained without alteration in any modified and/or
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redistributed versions, and that such modified versions are clearly identified as such.
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No licenses are granted by implication, estoppel or otherwise under any patents
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or trademarks of Motorola, Inc.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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68060 INTEGER SOFTWARE PACKAGE (Library version)
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-------------------------------------------------
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The file ilsp.s contains the "Library version" of the
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68060 Integer Software Package. Routines included in this
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module can be used to emulate 64-bit divide and multiply,
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and the "cmp2" instruction. These instructions are not
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implemented in hardware on the 68060 and normally take
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exception vector #61 "Unimplemented Integer Instruction".
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By re-compiling a program that uses these instructions, and
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making subroutine calls in place of the unimplemented
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instructions, a program can avoid the overhead associated with
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taking the exception.
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Release file format:
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--------------------
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The file ilsp.sa is essentially a hexadecimal image of the
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release package. This is the ONLY format which will be supported.
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The hex image was created by assembling the source code and
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then converting the resulting binary output image into an
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ASCII text file. The hexadecimal numbers are listed
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using the Motorola Assembly Syntax assembler directive "dc.l"
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(define constant longword). The file can be converted to other
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assembly syntaxes by using any word processor with a global
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search and replace function.
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To assist in assembling and linking this module with other modules,
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the installer should add a symbolic label to the top of the file.
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This will allow calling routines to access the entry points
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of this package.
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The source code ilsp.s has also been included but only for
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documentation purposes.
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Release file structure:
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-----------------------
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The file ilsp.sa contains an "Entry-Point" section and a
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code section. The ILSP has no "Call-Out" section. The first section
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is the "Entry-Point" section. In order to access a function in the
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package, a program must "bsr" or "jsr" to the location listed
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below in "68060ILSP Entry Points" that corresponds to the desired
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function. A branch instruction located at the selected entry point
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within the package will then enter the correct emulation code routine.
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The entry point addresses at the beginning of the package will remain
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fixed so that a program calling the routines will not have to be
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re-compiled with every new 68060ILSP release.
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For example, to use a 64-bit multiply instruction,
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do a "bsr" or "jsr" to the entry point defined by
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the 060ILSP entry table. A compiler generated code sequence
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for unsigned multiply could look like:
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# mulu.l <ea>,Dh:Dl
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# mulu.l _multiplier,%d1:%d0
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subq.l &0x8,%sp # make room for result on stack
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pea (%sp) # pass: result addr on stack
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mov.l %d0,-(%sp) # pass: multiplicand on stack
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mov.l _multiplier,-(%sp) # pass: multiplier on stack
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bsr.l _060LISP_TOP+0x18 # branch to multiply routine
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add.l &0xc,%sp # clear arguments from stack
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mov.l (%sp)+,%d1 # load result[63:32]
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mov.l (%sp)+,%d0 # load result[31:0]
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For a divide:
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# divu.l <ea>,Dr:Dq
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# divu.l _divisor,%d1:%d0
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subq.l &0x8,%sp # make room for result on stack
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pea (%sp) # pass: result addr on stack
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mov.l %d0,-(%sp) # pass: dividend hi on stack
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mov.l %d1,-(%sp) # pass: dividend hi on stack
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mov.l _divisor,-(%sp) # pass: divisor on stack
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bsr.l _060LISP_TOP+0x08 # branch to divide routine
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add.l &0xc,%sp # clear arguments from stack
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mov.l (%sp)+,%d1 # load remainder
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mov.l (%sp)+,%d0 # load quotient
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The library routines also return the correct condition code
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register value. If this is important, then the caller of the library
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routine must make sure that the value isn't lost while popping
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other items off of the stack.
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An example of using the "cmp2" instruction is as follows:
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# cmp2.l <ea>,Rn
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# cmp2.l _bounds,%d0
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pea _bounds # pass ptr to bounds
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mov.l %d0,-(%sp) # pass Rn
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bsr.l _060LSP_TOP_+0x48 # branch to "cmp2" routine
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mov.w %cc,_tmp # save off condition codes
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addq.l &0x8,%sp # clear arguments from stack
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Exception reporting:
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--------------------
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If the instruction being emulated is a divide and the source
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operand is a zero, then the library routine, as its last
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instruction, executes an implemented divide using a zero
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source operand so that an "Integer Divide-by-Zero" exception
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will be taken. Although the exception stack frame will not
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point to the correct instruction, the user will at least be able
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to record that such an event occurred if desired.
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68060ILSP entry points:
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-----------------------
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_060ILSP_TOP:
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0x000: _060LSP__idivs64_
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0x008: _060LSP__idivu64_
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0x010: _060LSP__imuls64_
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0x018: _060LSP__imulu64_
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0x020: _060LSP__cmp2_Ab_
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0x028: _060LSP__cmp2_Aw_
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0x030: _060LSP__cmp2_Al_
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0x038: _060LSP__cmp2_Db_
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0x040: _060LSP__cmp2_Dw_
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0x048: _060LSP__cmp2_Dl_
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