296 lines
10 KiB
Plaintext
296 lines
10 KiB
Plaintext
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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 FLOATING-POINT SOFTWARE PACKAGE (Kernel version)
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-------------------------------------------------------
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The file fpsp.sa contains the 68060 Floating-Point Software
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Package. This package is essentially a set of exception handlers
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that can be integrated into an operating system.
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These exception handlers emulate Unimplemented FP instructions,
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instructions using unimplemented data types, and instructions
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using unimplemented addressing modes. In addition, this package
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includes exception handlers to provide full IEEE-754 compliant
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exception handling.
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Release file format:
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--------------------
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The file fpsp.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 fpsp.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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(top of module)
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-----------------
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| | - 128 byte-sized section
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(1) | Call-Out | - 4 bytes per entry (user fills these in)
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| | - example routines in fskeleton.s
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-----------------
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| | - 8 bytes per entry
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(2) | Entry Point | - user does "bra" or "jmp" to this address
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-----------------
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| | - code section
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(3) ~ ~
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-----------------
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(bottom of module)
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The first section of this module is the "Call-out" section. This section
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is NOT INCLUDED in fpsp.sa (an example "Call-out" section is provided at
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the end of the file fskeleton.s). The purpose of this section is to allow
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the FPSP routines to reference external functions that must be provided
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by the host operating system. This section MUST be exactly 128 bytes in
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size. There are 32 fields, each 4 bytes in size. Each field corresponds
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to a function required by the FPSP (these functions and their location are
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listed in "68060FPSP call-outs" below). Each field entry should contain
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the address of the corresponding function RELATIVE to the starting address
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of the "call-out" section. The "Call-out" section must sit adjacent to the
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fpsp.sa image in memory.
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The second section, the "Entry-point" section, is used by external routines
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to access the functions within the FPSP. Since the fpsp.sa hex file contains
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no symbol names, this section contains function entry points that are fixed
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with respect to the top of the package. The currently defined entry-points
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are listed in section "68060 FPSP entry points" below. A calling routine
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would simply execute a "bra" or "jmp" that jumped to the selected function
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entry-point.
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For example, if the 68060 hardware took a "Line-F Emulator" exception
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(vector #11), the operating system should execute something similar to:
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bra _060FPSP_TOP+128+48
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(_060FPSP_TOP is the starting address of the "Call-out" section; the "Call-out"
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section is 128 bytes long; and the F-Line FPSP handler entry point is located
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48 bytes from the top of the "Entry-point" section.)
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The third section is the code section. After entering through an "Entry-point",
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the entry code jumps to the appropriate emulation code within the code section.
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68060FPSP call-outs: (details in fskeleton.s)
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--------------------
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0x000: _060_real_bsun
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0x004: _060_real_snan
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0x008: _060_real_operr
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0x00c: _060_real_ovfl
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0x010: _060_real_unfl
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0x014: _060_real_dz
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0x018: _060_real_inex
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0x01c: _060_real_fline
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0x020: _060_real_fpu_disabled
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0x024: _060_real_trap
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0x028: _060_real_trace
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0x02c: _060_real_access
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0x030: _060_fpsp_done
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0x034: (Motorola reserved)
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0x038: (Motorola reserved)
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0x03c: (Motorola reserved)
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0x040: _060_imem_read
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0x044: _060_dmem_read
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0x048: _060_dmem_write
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0x04c: _060_imem_read_word
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0x050: _060_imem_read_long
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0x054: _060_dmem_read_byte
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0x058: _060_dmem_read_word
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0x05c: _060_dmem_read_long
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0x060: _060_dmem_write_byte
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0x064: _060_dmem_write_word
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0x068: _060_dmem_write_long
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0x06c: (Motorola reserved)
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0x070: (Motorola reserved)
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0x074: (Motorola reserved)
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0x078: (Motorola reserved)
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0x07c: (Motorola reserved)
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68060FPSP entry points:
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-----------------------
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0x000: _060_fpsp_snan
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0x008: _060_fpsp_operr
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0x010: _060_fpsp_ovfl
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0x018: _060_fpsp_unfl
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0x020: _060_fpsp_dz
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0x028: _060_fpsp_inex
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0x030: _060_fpsp_fline
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0x038: _060_fpsp_unsupp
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0x040: _060_fpsp_effadd
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Miscellaneous:
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--------------
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_060_fpsp_snan:
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----------------
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- documented in 3.5 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_snan --|
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always exits through _060_real_snan <----
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_060_fpsp_operr:
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----------------
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- documented in 3.5 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_operr --|
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always exits through _060_real_operr <-----
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_060_fpsp_dz:
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----------------
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- documented in 3.7 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_dz --|
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always exits through _060_real_dz <----
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_060_fpsp_inex:
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----------------
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- documented in 3.6 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_inex --|
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always exits through _060_real_inex <----
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_060_fpsp_ovfl:
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----------------
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- documented in 3.4 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_ovfl --|
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may exit through _060_real_inex <---|
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or |
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may exit through _060_real_ovfl <---|
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or |
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may exit through _060_fpsp_done <---|
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_060_fpsp_unfl:
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----------------
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- documented in 3.4 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_unfl --|
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may exit through _060_real_inex <---|
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or |
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may exit through _060_real_unfl <---|
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or |
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may exit through _060_fpsp_done <---|
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_060_fpsp_fline:
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-----------------
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- not fully documented in 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_fline --|
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-------------------------------------------
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v v v
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(unimplemented (fpu disabled) (possible F-line illegal)
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stack frame) | v
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| v special case "fmovecr"?
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| exit through |
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| _060_real_fpu_disabled -------------
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| ^ v v
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| | (yes) (no)
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| | v v
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| | fpu disabled? exit through
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| | | _060_real_fline
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v | -------------
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| | | |
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| | v v
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| |-----------(yes) (no)
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|----<------------------------------------|
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|----> may exit through _060_real_trace
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|----> may exit through _060_real_trap
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|----> may exit through _060_real_bsun
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|----> may exit through _060_fpsp_done
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_060_fpsp_unsupp:
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------------------
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- documented in 3.1 of 060SP spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_unsupp --|
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may exit through _060_real_snan <----|
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or |
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may exit through _060_real_operr <----|
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or |
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may exit through _060_real_ovfl <----|
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or |
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may exit through _060_real_unfl <----|
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or |
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may exit through _060_real_inex <----|
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or |
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may exit through _060_real_trace <----|
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or |
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may exit through _060_fpsp_done <----|
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_060_fpsp_effadd:
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------------------
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- documented in 3.3 of 060 spec.
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- Basic flow:
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exception taken ---> enter _060_fpsp_effadd --|
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may exit through _060_real_trace <----|
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or |
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may exit through _060_real_fpu_disabled <----|
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or |
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may exit through _060_fpsp_done <----|
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