patch-1.3.94 linux/arch/m68k/ifpsp060/fpsp.doc

• Lines: 296
• Date: Mon Jan 8 22:08:15 1996
• Orig file: v1.3.93/linux/arch/m68k/ifpsp060/fpsp.doc
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.93/linux/arch/m68k/ifpsp060/fpsp.doc linux/arch/m68k/ifpsp060/fpsp.doc
@@ -0,0 +1,295 @@
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+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 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      <----|