300 lines
10 KiB
Plaintext
300 lines
10 KiB
Plaintext
#
|
||
# $NetBSD: fpsp.doc,v 1.1 2000/04/14 20:24:37 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.
|
||
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
||
68060 FLOATING-POINT SOFTWARE PACKAGE (Kernel version)
|
||
-------------------------------------------------------
|
||
|
||
The file fpsp.sa contains the 68060 Floating-Point Software
|
||
Package. This package is essentially a set of exception handlers
|
||
that can be integrated into an operating system.
|
||
These exception handlers emulate Unimplemented FP instructions,
|
||
instructions using unimplemented data types, and instructions
|
||
using unimplemented addressing modes. In addition, this package
|
||
includes exception handlers to provide full IEEE-754 compliant
|
||
exception handling.
|
||
|
||
Release file format:
|
||
--------------------
|
||
The file fpsp.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 fpsp.s has also been included but only for
|
||
documentation purposes.
|
||
|
||
Release file structure:
|
||
-----------------------
|
||
|
||
(top of module)
|
||
-----------------
|
||
| | - 128 byte-sized section
|
||
(1) | Call-Out | - 4 bytes per entry (user fills these in)
|
||
| | - example routines in fskeleton.s
|
||
-----------------
|
||
| | - 8 bytes per entry
|
||
(2) | Entry Point | - user does "bra" or "jmp" to this address
|
||
| |
|
||
-----------------
|
||
| | - code section
|
||
(3) ~ ~
|
||
| |
|
||
-----------------
|
||
(bottom of module)
|
||
|
||
The first section of this module is the "Call-out" section. This section
|
||
is NOT INCLUDED in fpsp.sa (an example "Call-out" section is provided at
|
||
the end of the file fskeleton.s). The purpose of this section is to allow
|
||
the FPSP routines to reference external functions that must be provided
|
||
by the host operating system. This section MUST be exactly 128 bytes in
|
||
size. There are 32 fields, each 4 bytes in size. Each field corresponds
|
||
to a function required by the FPSP (these functions and their location are
|
||
listed in "68060FPSP call-outs" below). Each field entry should contain
|
||
the address of the corresponding function RELATIVE to the starting address
|
||
of the "call-out" section. The "Call-out" section must sit adjacent to the
|
||
fpsp.sa image in memory.
|
||
|
||
The second section, the "Entry-point" section, is used by external routines
|
||
to access the functions within the FPSP. Since the fpsp.sa hex file contains
|
||
no symbol names, this section contains function entry points that are fixed
|
||
with respect to the top of the package. The currently defined entry-points
|
||
are listed in section "68060 FPSP entry points" below. A calling routine
|
||
would simply execute a "bra" or "jmp" that jumped to the selected function
|
||
entry-point.
|
||
|
||
For example, if the 68060 hardware took a "Line-F Emulator" exception
|
||
(vector #11), the operating system should execute something similar to:
|
||
|
||
bra _060FPSP_TOP+128+48
|
||
|
||
(_060FPSP_TOP is the starting address of the "Call-out" section; the "Call-out"
|
||
section is 128 bytes long; and the F-Line FPSP handler entry point is located
|
||
48 bytes from the top of the "Entry-point" section.)
|
||
|
||
The third section is the code section. After entering through an "Entry-point",
|
||
the entry code jumps to the appropriate emulation code within the code section.
|
||
|
||
68060FPSP call-outs: (details in fskeleton.s)
|
||
--------------------
|
||
0x000: _060_real_bsun
|
||
0x004: _060_real_snan
|
||
0x008: _060_real_operr
|
||
0x00c: _060_real_ovfl
|
||
0x010: _060_real_unfl
|
||
0x014: _060_real_dz
|
||
0x018: _060_real_inex
|
||
0x01c: _060_real_fline
|
||
0x020: _060_real_fpu_disabled
|
||
0x024: _060_real_trap
|
||
0x028: _060_real_trace
|
||
0x02c: _060_real_access
|
||
0x030: _060_fpsp_done
|
||
|
||
0x034: (Motorola reserved)
|
||
0x038: (Motorola reserved)
|
||
0x03c: (Motorola reserved)
|
||
|
||
0x040: _060_imem_read
|
||
0x044: _060_dmem_read
|
||
0x048: _060_dmem_write
|
||
0x04c: _060_imem_read_word
|
||
0x050: _060_imem_read_long
|
||
0x054: _060_dmem_read_byte
|
||
0x058: _060_dmem_read_word
|
||
0x05c: _060_dmem_read_long
|
||
0x060: _060_dmem_write_byte
|
||
0x064: _060_dmem_write_word
|
||
0x068: _060_dmem_write_long
|
||
|
||
0x06c: (Motorola reserved)
|
||
0x070: (Motorola reserved)
|
||
0x074: (Motorola reserved)
|
||
0x078: (Motorola reserved)
|
||
0x07c: (Motorola reserved)
|
||
|
||
68060FPSP entry points:
|
||
-----------------------
|
||
0x000: _060_fpsp_snan
|
||
0x008: _060_fpsp_operr
|
||
0x010: _060_fpsp_ovfl
|
||
0x018: _060_fpsp_unfl
|
||
0x020: _060_fpsp_dz
|
||
0x028: _060_fpsp_inex
|
||
0x030: _060_fpsp_fline
|
||
0x038: _060_fpsp_unsupp
|
||
0x040: _060_fpsp_effadd
|
||
|
||
|
||
Miscellaneous:
|
||
--------------
|
||
|
||
_060_fpsp_snan:
|
||
----------------
|
||
- documented in 3.5 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_snan --|
|
||
|
|
||
always exits through _060_real_snan <----
|
||
|
||
_060_fpsp_operr:
|
||
----------------
|
||
- documented in 3.5 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_operr --|
|
||
|
|
||
always exits through _060_real_operr <-----
|
||
|
||
_060_fpsp_dz:
|
||
----------------
|
||
- documented in 3.7 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_dz --|
|
||
|
|
||
always exits through _060_real_dz <----
|
||
|
||
_060_fpsp_inex:
|
||
----------------
|
||
- documented in 3.6 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_inex --|
|
||
|
|
||
always exits through _060_real_inex <----
|
||
|
||
_060_fpsp_ovfl:
|
||
----------------
|
||
- documented in 3.4 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_ovfl --|
|
||
|
|
||
may exit through _060_real_inex <---|
|
||
or |
|
||
may exit through _060_real_ovfl <---|
|
||
or |
|
||
may exit through _060_fpsp_done <---|
|
||
|
||
_060_fpsp_unfl:
|
||
----------------
|
||
- documented in 3.4 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_unfl --|
|
||
|
|
||
may exit through _060_real_inex <---|
|
||
or |
|
||
may exit through _060_real_unfl <---|
|
||
or |
|
||
may exit through _060_fpsp_done <---|
|
||
|
||
_060_fpsp_fline:
|
||
-----------------
|
||
- not fully documented in 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_fline --|
|
||
|
|
||
-------------------------------------------
|
||
| | |
|
||
v v v
|
||
(unimplemented (fpu disabled) (possible F-line illegal)
|
||
stack frame) | v
|
||
| v special case "fmovecr"?
|
||
| exit through |
|
||
| _060_real_fpu_disabled -------------
|
||
| | |
|
||
| ^ v v
|
||
| | (yes) (no)
|
||
| | v v
|
||
| | fpu disabled? exit through
|
||
| | | _060_real_fline
|
||
v | -------------
|
||
| | | |
|
||
| | v v
|
||
| |-----------(yes) (no)
|
||
| |
|
||
|----<------------------------------------|
|
||
|
|
||
|
|
||
|----> may exit through _060_real_trace
|
||
|
|
||
|----> may exit through _060_real_trap
|
||
|
|
||
|----> may exit thorugh _060_real_bsun
|
||
|
|
||
|----> may exit through _060_fpsp_done
|
||
|
||
_060_fpsp_unsupp:
|
||
------------------
|
||
- documented in 3.1 of 060SP spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_unsupp --|
|
||
|
|
||
|
|
||
may exit through _060_real_snan <----|
|
||
or |
|
||
may exit through _060_real_operr <----|
|
||
or |
|
||
may exit through _060_real_ovfl <----|
|
||
or |
|
||
may exit through _060_real_unfl <----|
|
||
or |
|
||
may exit through _060_real_inex <----|
|
||
or |
|
||
may exit through _060_real_trace <----|
|
||
or |
|
||
may exit through _060_fpsp_done <----|
|
||
|
||
_060_fpsp_effadd:
|
||
------------------
|
||
- documented in 3.3 of 060 spec.
|
||
- Basic flow:
|
||
exception taken ---> enter _060_fpsp_effadd --|
|
||
|
|
||
|
|
||
may exit through _060_real_trace <----|
|
||
or |
|
||
may exit through _060_real_fpu_disabled <----|
|
||
or |
|
||
may exit through _060_fpsp_done <----|
|