-
- a56 - a DSP56001 assembler - version 1.1
-
-/*
- * Copyright (C) 1990-1992 Quinn C. Jensen
- *
- * Permission to use, copy, modify, distribute, and sell this software
- * and its documentation for any purpose is hereby granted without fee,
- * provided that the above copyright notice appear in all copies and
- * that both that copyright notice and this permission notice appear
- * in supporting documentation. The author makes no representations
- * about the suitability of this software for any purpose. It is
- * provided "as is" without express or implied warranty.
- *
- */
-
-V1.1 CHANGES
-
-Many thanks to Tom Cunningham at Motorola who noted several bugs, fixing
-most of them. Thanks also to Stephen Edwards at CalTech for his fixes as well.
-Both he and Tom fixed up the XY parallel move code; I believe all the
-fixes are integrated.
-
-Summary of changes since v1.0:
-
- - Jcc, JScc, Tcc recognizes "CC" synonym for "HS" (Tom)
- - LUA syntax fixed (Tom, Stephen)
- - DIV syntax fixed (Tom)
- - XY move fixed (Tom, Stephen)
- - a56 now detects phase errors (changes in symbol values
- between pass 1 and 2)
- - several causes of phase errors fixed
- - immediate value handling improved for both integer and
- fixed-point values
- - symbols have type (INT or FLOAT)
- - cpp droppings are properly handled
- - ALIGN pseudo-op added
-
-Known bugs/deficiencies:
-
- - MOVE to a control reg generates bogus code (always use MOVEC,
- MOVEM, and MOVEP)
-
-The example code has been cleaned up a bit and I've included my
-56K board's envelope code - tdsg.basic.a56. This code is specific to
-my implimentation.
-
-A note on the reverb code - I have since found since posting version 1.0
-that the reverb code has a great-big almost-DC bumb in its impulse
-response. I found this after doing some simulations. I suspected something
-was wrong because I had to scale the output of the comb filters by .046
-or something before going into the two all-pass stages. Overall I think it
-works better without the 1.7 ms all-pass. There's another reverb example
-on Dr. Bubb that fits Moorer's 1979 model better. I've included this in
-the examples but I have not yet assembled or tried it.
-
-OVERVIEW
-
-This program was written as a vehicle to learn the intricacies
-of the DSP56001 instruction set, and to provide a tool for Unix-based
-DSP code development (for those of us without a NeXT machine.)
-
-The intent was to provide compatibility with Motorola assembler's syntax.
-But since the author did not have Motorola's assembler or its documentation,
-it is no doubt far from compatible. Only a few pseudo-ops are implemented--
-probably only partially.
-
-Macros are not supported, except through the use of an external macro
-preprocessor, such as /lib/cpp. To facilitate cpp macro expansion, multiple
-assembler statements on a single input line are delimited with an '@', e.g.:
-
- #define JCHEQ(c,label) move #c,x0 @cmp x0,a @jeq label
-
- #define JCHNE(c,label) move #c,x0 @cmp x0,a @jne label
-
-
-SUPPORTED PSEUDO-OPS
-
-The following is a list of the pseudo-ops that are recognized:
-
- <symbol> = <expression> ;assign a symbol
-
- ALIGN <number> ;set location pointer
- ;to next integral
- ;multiple of <number>
-
- ORG <space:> <expression> ;new location pointer
- ORG <space:> <expression>, <space:> <expression>
-
- DC <dc_list> ;declare constants
-
- PAGE <number>, <number>, <number>, <number> ;ignored
-
- INCLUDE <file> ;file inclusion
-
- END ;end
-
-In addition, a "PSECT" pseudo-op was implemented. It allows program sections
-to be defined and bopped in and out of, each with its own location counter and
-space. The Motorola assembler probably does not have this pseudo-op, but no
-doubt supports the concept in some way.
-
- PSECT <name> <space:><begin_addr>:<end_addr> ;define
-
- PSECT <name> ;switch to psect <name>
-
-
-FUTURE DIRECTION
-
-The assembler probably generates bogus code here and there, and no doubt
-does not handle all of the syntax. I welcome all comments, fixes and
-enhancements.
-
-TO MAKE AND USE
-
-Type "make". gram.c and lex.yy.c are provided for those without yacc
-(or bison) and/or lex.
-
-The resulting program, a56, is used as follows:
-
- a56 [-b] [-l] [-o output-file] file [...]
-
-An assembler listing is sent to the standard-output and an ascii-formatted
-object file (a56.out) is produced. The "-b" option adds binary to the listing.
-"-l" causes included files to be listed. "-o" directs the output to the
-specified file rather than the default, a56.out.
-
-A separate program, toomf, converts a56.out into "OMF" format suitable for
-downloading to the 56001 via the sloader.a56 program.
-
- toomf < a56.out > file.omf
-
-AUTHOR
-
-11/28/91
-v1.1 8/6/92
-
-Quinn C. Jensen
-1374 N 40 E
-Orem, UT 84057
-
-home: jensenq@zdomain.com (preferred address for a56 correspondence)
-work: jensenq@novell.com
projects / linux-libre-firmware.git / blobdiff