32 ASLINK Relocating Linker
35 CHAPTER 1 THE ASSEMBLER 1-1
36 1.1 THE ASXXXX ASSEMBLERS 1-1
37 1.1.1 Assembly Pass 1 1-2
38 1.1.2 Assembly Pass 2 1-2
39 1.1.3 Assembly Pass 3 1-2
40 1.2 SOURCE PROGRAM FORMAT 1-3
41 1.2.1 Statement Format 1-3
42 1.2.1.1 Label Field 1-3
43 1.2.1.2 Operator Field 1-5
44 1.2.1.3 Operand Field 1-5
45 1.2.1.4 Comment Field 1-6
46 1.3 SYMBOLS AND EXPRESSIONS 1-6
47 1.3.1 Character Set 1-6
48 1.3.2 User-Defined Symbols 1-10
49 1.3.3 Local Symbols 1-11
50 1.3.4 Current Location Counter 1-12
53 1.3.7 Expressions 1-15
54 1.4 GENERAL ASSEMBLER DIRECTIVES 1-16
55 1.4.1 .module Directive 1-16
56 1.4.2 .title Directive 1-17
57 1.4.3 .sbttl Directive 1-17
58 1.4.4 .page Directive 1-17
59 1.4.5 .byte and .db Directives 1-17
60 1.4.6 .word and .dw Directives 1-18
61 1.4.7 .blkb, .blkw, and .ds Directives 1-18
62 1.4.8 .ascii Directive 1-18
63 1.4.9 .ascis Directive 1-19
64 1.4.10 .asciz Directive 1-19
65 1.4.11 .radix Directive 1-20
66 1.4.12 .even Directive 1-20
67 1.4.13 .odd Directive 1-20
68 1.4.14 .area Directive 1-21
69 1.4.15 .org Directive 1-22
70 1.4.16 .globl Directive 1-23
71 1.4.17 .if, .else, and .endif Directives 1-23
72 1.4.18 .include Directive 1-24
73 1.4.19 .setdp Directive 1-25
74 1.5 INVOKING ASXXXX 1-27
77 1.8 SYMBOL TABLE FILE 1-30
80 CHAPTER 2 THE LINKER 2-1
81 2.1 ASLINK RELOCATING LINKER 2-1
82 2.2 INVOKING ASLINK 2-2
83 2.3 LIBRARY PATH(S) AND FILE(S) 2-3
84 2.4 ASLINK PROCESSING 2-4
85 2.5 LINKER INPUT FORMAT 2-5
86 2.5.1 Object Module Format 2-6
100 2.6 LINKER ERROR MESSAGES 2-8
101 2.7 INTEL HEX OUTPUT FORMAT 2-11
102 2.8 MOTORLA S1-S9 OUTPUT FORMAT 2-12
104 CHAPTER 3 BUILDING ASXXXX AND ASLINK 3-1
105 3.1 BUILDING AN ASSEMBLER 3-1
106 3.2 BUILDING ASLINK 3-2
108 APPENDIX A AS6800 ASSEMBLER A-1
109 A.1 6800 REGISTER SET A-1
110 A.2 6800 INSTRUCTION SET A-1
111 A.2.1 Inherent Instructions A-2
112 A.2.2 Branch Instructions A-2
113 A.2.3 Single Operand Instructions A-3
114 A.2.4 Double Operand Instructions A-4
115 A.2.5 Jump and Jump to Subroutine Instructions A-4
116 A.2.6 Long Register Instructions A-5
118 APPENDIX B AS6801 ASSEMBLER B-1
119 B.1 .hd6303 DIRECTIVE B-1
120 B.2 6801 REGISTER SET B-1
121 B.3 6801 INSTRUCTION SET B-1
122 B.3.1 Inherent Instructions B-2
123 B.3.2 Branch Instructions B-2
124 B.3.3 Single Operand Instructions B-3
125 B.3.4 Double Operand Instructions B-4
126 B.3.5 Jump and Jump to Subroutine Instructions B-5
127 B.3.6 Long Register Instructions B-5
128 B.3.7 6303 Specific Instructions B-5
130 APPENDIX C AS6804 ASSEMBLER C-1
131 C.1 6804 REGISTER SET C-1
132 C.2 6804 INSTRUCTION SET C-1
133 C.2.1 Inherent Instructions C-2
134 C.2.2 Branch Instructions C-2
135 C.2.3 Single Operand Instructions C-2
136 C.2.4 Jump and Jump to Subroutine Instructions C-2
137 C.2.5 Bit Test Instructions C-2
138 C.2.6 Load Immediate data Instruction C-3
139 C.2.7 6804 Derived Instructions C-3
141 APPENDIX D AS6805 ASSEMBLER D-1
142 D.1 6805 REGISTER SET D-1
143 D.2 6805 INSTRUCTION SET D-1
144 D.2.1 Control Instructions D-2
145 D.2.2 Bit Manipulation Instructions D-2
146 D.2.3 Branch Instructions D-2
147 D.2.4 Read-Modify-Write Instructions D-3
148 D.2.5 Register\Memory Instructions D-3
155 D.2.6 Jump and Jump to Subroutine Instructions D-4
157 APPENDIX E AS68HC08 ASSEMBLER E-1
158 E.1 68HC08 REGISTER SET E-1
159 E.2 68HC08 INSTRUCTION SET E-1
160 E.2.1 Control Instructions E-2
161 E.2.2 Bit Manipulation Instructions E-2
162 E.2.3 Branch Instructions E-3
163 E.2.4 Complex Branch Instructions E-3
164 E.2.5 Read-Modify-Write Instructions E-4
165 E.2.6 Register\Memory Instructions E-5
166 E.2.7 Double Operand Move Instruction E-5
167 E.2.8 16-Bit <H:X> Index Register Instructions E-5
168 E.2.9 Jump and Jump to Subroutine Instructions E-5
170 APPENDIX F AS6809 ASSEMBLER F-1
171 F.1 6809 REGISTER SET F-1
172 F.2 6809 INSTRUCTION SET F-1
173 F.2.1 Inherent Instructions F-3
174 F.2.2 Short Branch Instructions F-3
175 F.2.3 Long Branch Instructions F-3
176 F.2.4 Single Operand Instructions F-4
177 F.2.5 Double Operand Instructions F-5
178 F.2.6 D-register Instructions F-5
179 F.2.7 Index/Stack Register Instructions F-5
180 F.2.8 Jump and Jump to Subroutine Instructions F-6
181 F.2.9 Register - Register Instructions F-6
182 F.2.10 Condition Code Register Instructions F-6
183 F.2.11 6800 Compatibility Instructions F-6
185 APPENDIX G AS6811 ASSEMBLER G-1
186 G.1 6811 REGISTER SET G-1
187 G.2 6811 INSTRUCTION SET G-1
188 G.2.1 Inherent Instructions G-2
189 G.2.2 Branch Instructions G-2
190 G.2.3 Single Operand Instructions G-3
191 G.2.4 Double Operand Instructions G-4
192 G.2.5 Bit Manupulation Instructions G-4
193 G.2.6 Jump and Jump to Subroutine Instructions G-5
194 G.2.7 Long Register Instructions G-5
196 APPENDIX H AS6816 ASSEMBLER H-1
197 H.1 6816 REGISTER SET H-1
198 H.2 6816 INSTRUCTION SET H-1
199 H.2.1 Inherent Instructions H-2
200 H.2.2 Push/Pull Multiple Register Instructions H-3
201 H.2.3 Short Branch Instructions H-3
202 H.2.4 Long Branch Instructions H-3
203 H.2.5 Bit Manipulation Instructions H-3
204 H.2.6 Single Operand Instructions H-4
205 H.2.7 Double Operand Instructions H-5
206 H.2.8 Index/Stack Register Instructions H-5
213 H.2.9 Jump and Jump to Subroutine Instructions H-6
214 H.2.10 Condition Code Register Instructions H-6
215 H.2.11 Multiply and Accumulate Instructions H-6
217 APPENDIX I ASH8 ASSEMBLER I-1
218 I.1 H8/3XX REGISTER SET I-1
219 I.2 H8/3XX INSTRUCTION SET I-1
220 I.2.1 Inherent Instructions I-2
221 I.2.2 Branch Instructions I-2
222 I.2.3 Single Operand Instructions I-3
223 I.2.4 Double Operand Instructions I-4
224 I.2.5 Mov Instructions I-5
225 I.2.6 Bit Manipulation Instructions I-6
226 I.2.7 Extended Bit Manipulation Instructions I-7
227 I.2.8 Condition Code Instructions I-7
228 I.2.9 Other Instructions I-8
229 I.2.10 Jump and Jump to Subroutine Instructions I-8
231 APPENDIX J AS8085 ASSEMBLER J-1
232 J.1 8085 REGISTER SET J-1
233 J.2 8085 INSTRUCTION SET J-1
234 J.2.1 Inherent Instructions J-2
235 J.2.2 Register/Memory/Immediate Instructions J-2
236 J.2.3 Call and Return Instructions J-2
237 J.2.4 Jump Instructions J-2
238 J.2.5 Input/Output/Reset Instructions J-3
239 J.2.6 Move Instructions J-3
240 J.2.7 Other Instructions J-3
242 APPENDIX K ASZ80 ASSEMBLER K-1
243 K.1 .hd64 DIRECTIVE K-1
244 K.2 Z80 REGISTER SET AND CONDITIONS K-1
245 K.3 Z80 INSTRUCTION SET K-2
246 K.3.1 Inherent Instructions K-3
247 K.3.2 Implicit Operand Instructions K-3
248 K.3.3 Load Instruction K-4
249 K.3.4 Call/Return Instructions K-4
250 K.3.5 Jump and Jump to Subroutine Instructions K-4
251 K.3.6 Bit Manipulation Instructions K-5
252 K.3.7 Interrupt Mode and Reset Instructions K-5
253 K.3.8 Input and Output Instructions K-5
254 K.3.9 Register Pair Instructions K-5
255 K.3.10 HD64180 Specific Instructions K-6
257 APPENDIX L AS6500 ASSEMBLER L-1
258 L.1 ACKNOWLEDGMENT L-1
259 L.2 6500 REGISTER SET L-2
260 L.3 6500 INSTRUCTION SET L-2
261 L.3.1 Processor Specific Directives L-3
262 L.3.2 65xx Core Inherent Instructions L-3
263 L.3.3 65xx Core Branch Instructions L-3
264 L.3.4 65xx Core Single Operand Instructions L-3
271 L.3.5 65xx Core Double Operand Instructions L-4
272 L.3.6 65xx Core Jump and Jump to Subroutine
274 L.3.7 65xx Core Miscellaneous X and Y Register
276 L.3.8 65F11 and 65F12 Specific Instructions L-5
277 L.3.9 65C00/21 and 65C29 Specific Instructions L-5
278 L.3.10 65C02, 65C102, and 65C112 Specific
286 ASxxxx Cross Assemblers, Version 1.7
291 Kent State University
294 Operating System: TSX+, RT-11, PDOS, MS/DOS, Windows 3.x
295 or other supporting K&R C.
299 The ASxxxx Cross Assembler and Linker package (V1.7 November
300 1995) contains cross assemblers for the 6800(6802/6808),
301 6801(hd6303), 6804, 6805, 68HC08, 6809, 6811, 68HC16,
302 8085(8080), z80(hd64180), H8/3xx, and 6500 series microproces-
303 sors. Complete source code is provided with the assem-
304 bler/linker submission.
310 The ASxxxx Cross Assembler and Linker package is available
311 from Kent State University at shop-pdp.kent.edu by "anonymous"
330 The ASxxxx assemblers were written following the style of
331 several cross assemblers found in the Digital Equipment Corpora-
332 tion Users Society (DECUS) distribution of the C programming
333 language. The DECUS code was provided with no documentation as
334 to the input syntax or the output format. Study of the code
335 revealed that the unknown author of the code had attempted to
336 formulate an assembler with attributes similiar to those of the
337 PDP-11 MACRO assembler (without macro's). The incomplete code
338 from the DECUS C distribution has been largely rewritten, only
339 the program structure, and C source file organization remains
340 relatively unchanged. However, I wish to thank the author for
341 his contribution to this set of assemblers.
343 The ASLINK program was written as a companion to the ASxxxx
344 assemblers, its design and implementation was not derived from
347 The ASxxxx assemblers and the ASLINK relocating linker are
348 placed in the Public Domain. Publication or distribution of
349 these programs for non-commercial use is hereby granted with the
350 stipulation that the copyright notice be included with all
353 I would greatly appreciate receiving the details of any
354 changes, additions, or errors pertaining to these programs and
355 will attempt to incorporate any fixes or generally useful
356 changes in a future update to these programs.
361 Kent State University
366 baldwin@shop-pdp.kent.edu
391 1.1 THE ASXXXX ASSEMBLERS
394 The ASxxxx assemblers are a series of microprocessor assem-
395 blers written in the C programming language. Each assembler has
396 a device specific section which includes:
398 1. device description, byte order, and file extension in-
401 2. a table of the assembler general directives, special
402 device directives, assembler mnemonics and associated
405 3. machine specific code for processing the device mnemon-
406 ics, addressing modes, and special directives
408 The device specific information is detailed in the appendices.
410 The assemblers have a common device independent section which
411 handles the details of file input/output, symbol table genera-
412 tion, program/data areas, expression analysis, and assembler
413 directive processing.
415 The assemblers provide the following features:
417 1. Command string control of assembly functions
419 2. Alphabetized, formatted symbol table listing
421 3. Relocatable object modules
423 4. Global symbols for linking object modules
425 5. Conditional assembly directives
429 THE ASSEMBLER PAGE 1-2
430 THE ASXXXX ASSEMBLERS
433 6. Program sectioning directives
436 ASxxxx assembles one or more source files into a single relo-
437 catable ascii object file. The output of the ASxxxx assemblers
438 consists of an ascii relocatable object file(*.rel), an assembly
439 listing file(*.lst), and a symbol file(*.sym).
442 1.1.1 Assembly Pass 1
445 During pass 1, ASxxxx opens all source files and performs a
446 rudimenatry assembly of each source statement. During this pro-
447 cess all symbol tables are built, program sections defined, and
448 number of bytes for each assembled source line is estimated.
450 At the end of pass 1 all undefined symbols may be made global
451 (external) using the ASxxxx switch -g, otherwise undefined sym-
452 bols will be flagged as errors during succeeding passes.
455 1.1.2 Assembly Pass 2
458 During pass 2 the ASxxxx assembler resolves forward refer-
459 ences and determines the number of bytes for each assembled
460 line. The number of bytes used by a particular assembler in-
461 struction may depend upon the addressing mode, whether the in-
462 struction allows multiple forms based upon the relative distance
463 to the addressed location, or other factors. Pass 2 resolves
464 these cases and determines the address of all symbols.
467 1.1.3 Assembly Pass 3
470 Pass 3 by the assembler generates the listing file, the relo-
471 catable output file, and the symbol tables. Also during pass 3
472 the errors will be reported.
474 The relocatable object file is an ascii file containing sym-
475 bol references and definitions, program area definitions, and
476 the relocatable assembled code, the linker ASLINK will use this
477 information to generate an absolute load file (Motorola or Intel
483 THE ASSEMBLER PAGE 1-3
484 SOURCE PROGRAM FORMAT
487 1.2 SOURCE PROGRAM FORMAT
491 1.2.1 Statement Format
494 A source program is composed of assembly-language statements.
495 Each statement must be completed on one line. A line may con-
496 tain a maximum of 128 characters, longer lines are truncated and
499 An ASxxxx assembler statement may have as many as four
500 fields. These fields are identified by their order within the
501 statement and/or by separating characters between fields. The
502 general format of the ASxxxx statement is:
504 [label:] Operator Operand [;Comment(s)]
506 The label and comment fields are optional. The operator and
507 operand fields are interdependent. The operator field may be an
508 assembler directive or an assembly mnemonic. The operand field
509 may be optional or required as defined in the context of the
512 ASxxxx interprets and processes source statements one at a
513 time. Each statement causes a particular operation to be per-
517 1.2.1.1 Label Field -
519 A label is a user-defined symbol which is assigned the value
520 of the current location counter and entered into the user de-
521 fined symbol table. The current location counter is used by
522 ASxxxx to assign memory addresses to the source program state-
523 ments as they are encountered during the assembly process. Thus
524 a label is a means of symbolically referring to a specific
527 When a program section is absolute, the value of the current
528 location counter is absolute; its value references an absolute
529 memory address. Similarly, when a program section is relocat-
530 able, the value of the current location counter is relocatable.
531 A relocation bias calculated at link time is added to the ap-
532 parent value of the current location counter to establish its
533 effective absolute address at execution time. (The user can
534 also force the linker to relocate sections defined as absolute.
535 This may be required under special circumstances.)
537 If present, a label must be the first field in a source
538 statement and must be terminated by a colon (:). For example,
541 THE ASSEMBLER PAGE 1-4
542 SOURCE PROGRAM FORMAT
545 if the value of the current location counter is absolute
546 01F0(H), the statement:
550 assigns the value 01F0(H) to the label abcd. If the location
551 counter value were relocatable, the final value of abcd would be
552 01F0(H)+K, where K represents the relocation bias of the program
553 section, as calculated by the linker at link time.
555 More than one label may appear within a single label field.
556 Each label so specified is assigned the same address value. For
557 example, if the value of the current location counter is
558 1FF0(H), the multiple labels in the following statement are each
559 assigned the value 1FF0(H):
563 Multiple labels may also appear on successive lines. For ex-
564 ample, the statements
570 likewise cause the same value to be assigned to all three la-
573 A double colon (::) defines the label as a global symbol.
574 For example, the statement
578 establishes the label abcd as a global symbol. The distinguish-
579 ing attribute of a global symbol is that it can be referenced
580 from within an object module other than the module in which the
581 symbol is defined. References to this label in other modules
582 are resolved when the modules are linked as a composite execut-
585 The legal characters for defining labels are:
594 A label may be any length, however, only the first eight (8)
595 characters are significant and, therefore must be unique among
596 all labels in the source program (not necessarily among
599 THE ASSEMBLER PAGE 1-5
600 SOURCE PROGRAM FORMAT
603 separately compiled modules). An error code(s) (m or p) will be
604 generated in the assembly listing if the first eight characters
605 in two or more labels are the same. The m code is caused by the
606 redeclaration of the symbol or its reference by another state-
607 ment. The p code is generated because the symbols location is
608 changing on each pass through the source file.
610 The label must not start with the characters 0-9, as this
611 designates a local symbol with special attributes described in a
614 The label must not start with the sequence $$, as this
615 represents the temporary radix 16 for constants.
618 1.2.1.2 Operator Field -
620 The operator field specifies the action to be performed. It
621 may consist of an instruction mnemonic (op code) or an assembler
624 When the operator is an instruction mnemonic, a machine in-
625 struction is generated and the assembler evaluates the addresses
626 of the operands which follow. When the operator is a directive
627 ASxxxx performs certain control actions or processing operations
628 during assembly of the source program.
630 Leading and trailing spaces or tabs in the operator field
631 have no significance; such characters serve only to separate
632 the operator field from the preceeding and following fields.
634 An operator is terminated by a space, tab or end of line.
637 1.2.1.3 Operand Field -
639 When the operator is an instruction mnemonic (op code), the
640 operand field contains program variables that are to be
641 evaluated/manipulated by the operator.
643 Operands may be expressions or symbols, depending on the
644 operator. Multiple expressions used in the operand fields may
645 be separated by a comma. An operand should be preceeded by an
646 operator field; if it is not, the statement will give an error
647 (q or o). All operands following instruction mnemonics are
648 treated as expressions.
650 The operand field is terminated by a semicolon when the field
651 is followed by a comment. For example, in the following
654 label: lda abcd,x ;Comment field
657 THE ASSEMBLER PAGE 1-6
658 SOURCE PROGRAM FORMAT
662 the tab between lda and abcd terminates the operator field and
663 defines the beginning of the operand field; a comma separates
664 the operands abcd and x; and a semicolon terminates the operand
665 field and defines the beginning of the comment field. When no
666 comment field follows, the operand field is terminated by the
667 end of the source line.
670 1.2.1.4 Comment Field -
672 The comment field begins with a semicolon and extends through
673 the end of the line. This field is optional and may contain any
674 7-bit ascii character except null.
676 Comments do not affect assembly processing or program execu-
680 1.3 SYMBOLS AND EXPRESSIONS
683 This section describes the generic components of the ASxxxx
684 assemblers: the character set, the conventions observed in con-
685 structing symbols, and the use of numbers, operators, and ex-
692 The following characters are legal in ASxxxx source programs:
694 1. The letters A through Z. Both upper- and lower-case
695 letters are acceptable. The assemblers are case sensi-
696 tive, i.e. ABCD and abcd are different symbols. (The
697 assemblers can be made case insensitive by recompiling
698 with the appropriate switches.)
700 2. The digits 0 through 9
702 3. The characters . (period), $ (dollar sign), and _ (un-
705 4. The special characters listed in Tables 1 through 6.
708 Tables 1 through 6 describe the various ASxxxx label and
709 field terminators, assignment operators, operand separators, as-
710 sembly, unary, binary, and radix operators.
713 THE ASSEMBLER PAGE 1-7
714 SYMBOLS AND EXPRESSIONS
717 Table 1 Label Terminators and Assignment Operators
718 ----------------------------------------------------------------
720 : Colon Label terminator.
722 :: Double colon Label Terminator; defines the
723 label as a global label.
725 = Equal sign Direct assignment operator.
727 == Double equal Direct assignment operator;
728 sign defines the symbol as a global
731 ----------------------------------------------------------------
737 Table 2 Field Terminators and Operand Separators
738 ----------------------------------------------------------------
740 Tab Item or field terminator.
742 Space Item or field terminator.
744 , Comma Operand field separator.
746 ; Semicolon Comment field indicator.
748 ----------------------------------------------------------------
754 Table 3 Assembler Operators
755 ----------------------------------------------------------------
757 # Number sign Immediate expression indicator.
759 . Period Current location counter.
761 ( Left parenthesis Expression delimiter.
763 ) Right parenthesis Expression delimeter.
765 ----------------------------------------------------------------
768 THE ASSEMBLER PAGE 1-8
769 SYMBOLS AND EXPRESSIONS
777 Table 4 Unary Operators
778 ----------------------------------------------------------------
780 < Left bracket <FEDC Produces the lower byte
781 value of the expression.
784 > Right bracket >FEDC Produces the upper byte
785 value of the expression.
788 + Plus sign +A Positive value of A
790 - Minus sign -A Produces the negative
791 (2's complement) of A.
793 ~ Tilde ~A Produces the 1's comple-
796 ' Single quote 'D Produces the value of
799 " Double quote "AB Produces the double byte
802 \ Backslash '\n Unix style characters
804 or '\001 or octal byte values.
806 ----------------------------------------------------------------
814 THE ASSEMBLER PAGE 1-9
815 SYMBOLS AND EXPRESSIONS
818 Table 5 Binary Operators
819 ----------------------------------------------------------------
821 << Double 0800 << 4 Produces the 4 bit
822 Left bracket left-shifted value of
825 >> Double 0800 >> 4 Produces the 4 bit
826 Right bracket right-shifted value of
829 + Plus sign A + B Arithmetic Addition
832 - Minus sign A - B Arithmetic Subtraction
835 * Asterisk A * B Arithmetic Multiplica-
836 tion operator. (signed
839 / Slash A / B Arithmetic Division
843 & Ampersand A & B Logical AND operator.
845 | Bar A | B Logical OR operator.
847 % Percent sign A % B Modulus operator.
850 ^ Up arrow or A ^ B EXCLUSIVE OR operator.
853 ----------------------------------------------------------------
861 THE ASSEMBLER PAGE 1-10
862 SYMBOLS AND EXPRESSIONS
865 Table 6 Temporary Radix Operators
866 ----------------------------------------------------------------
868 $%, 0b, 0B Binary radix operator.
870 $&, 0o, 0O, 0q, 0Q Octal radix operator.
872 $#, 0d, 0D Decimal radix operator.
874 $$, 0h, 0H, 0x, 0X Hexidecimal radix operator.
877 Potential ambiguities arising from the use of 0b and 0d
878 as temporary radix operators may be circumvented by pre-
879 ceding all non-prefixed hexidecimal numbers with 00.
880 Leading 0's are required in any case where the first
881 hexidecimal digit is abcdef as the assembler will treat
882 the letter sequence as a label.
884 ----------------------------------------------------------------
892 1.3.2 User-Defined Symbols
895 User-defined symbols are those symbols that are equated to a
896 specific value through a direct assignment statement or appear
897 as labels. These symbols are added to the User Symbol Table as
898 they are encountered during assembly.
900 The following rules govern the creation of user-defined symbols:
902 1. Symbols can be composed of alphanumeric characters,
903 dollar signs ($), periods (.), and underscores (_)
906 2. The first character of a symbol must not be a number
907 (except in the case of local symbols).
909 3. The first eight characters of a symbol must be unique.
910 A symbol can be written with more than eight legal
911 characters, but the ninth and subsequent characters are
914 4. Spaces and Tabs must not be embedded within a symbol.
919 THE ASSEMBLER PAGE 1-11
920 SYMBOLS AND EXPRESSIONS
926 Local symbols are specially formatted symbols used as labels
927 within a block of coding that has been delimited as a local sym-
928 bol block. Local symbols are of the form n$, where n is a
929 decimal integer from 0 to 255, inclusive. Examples of local
937 The range of a local symbol block consists of those state-
938 ments between two normally constructed symbolic labels. Note
939 that a statement of the form:
943 is a direct assignment statement but does not create a label and
944 thus does not delimit the range of a local symbol block.
946 Note that the range of a local symbol block may extend across
949 Local symbols provide a convenient means of generating labels
950 for branch instructions and other such references within local
951 symbol blocks. Using local symbols reduces the possibility of
952 symbols with multiple definitions appearing within a user pro-
953 gram. In addition, the use of local symbols differentiates
954 entry-point labels from local labels, since local labels cannot
955 be referenced from outside their respective local symbol blocks.
956 Thus, local symbols of the same name can appear in other local
957 symbol blocks without conflict. Local symbols require less sym-
958 bol table space than normal symbols. Their use is recommended.
960 The use of the same local symbol within a local symbol block
961 will generate one or both of the m or p errors.
964 THE ASSEMBLER PAGE 1-12
965 SYMBOLS AND EXPRESSIONS
968 Example of local symbols:
970 a: ldx #atable ;get table address
971 lda #0d48 ;table length
976 b: ldx #btable ;get table address
977 lda #0d48 ;table length
983 1.3.4 Current Location Counter
986 The period (.) is the symbol for the current location coun-
987 ter. When used in the operand field of an instruction, the
988 period represents the address of the first byte of the
991 AS: ldx #. ;The period (.) refers to
992 ;the address of the ldx
995 When used in the operand field of an ASxxxx directive, it
996 represents the address of the current byte or word:
1000 .word 0xFFFE,.+4,QK ;The operand .+4 in the .word
1001 ;directive represents a value
1002 ;stored in the second of the
1003 ;three words during assembly.
1005 If we assume the current value of the program counter is
1006 0H0200, then during assembly, ASxxxx reserves three words of
1007 storage starting at location 0H0200. The first value, a hex-
1008 idecimal constant FFFE, will be stored at location 0H0200. The
1009 second value represented by .+4 will be stored at location
1010 0H0202, its value will be 0H0206 ( = 0H0202 + 4). The third
1011 value defined by the symbol QK will be placed at location
1014 At the beginning of each assembly pass, ASxxxx resets the lo-
1015 cation counter. Normally, consecutive memory locations are as-
1016 signed to each byte of object code generated. However, the
1017 value of the location counter can be changed through a direct
1018 assignment statement of the following form:
1022 THE ASSEMBLER PAGE 1-13
1023 SYMBOLS AND EXPRESSIONS
1029 The new location counter can only be specified relative to
1030 the current location counter. Neglecting to specify the current
1031 program counter along with the expression on the right side of
1032 the assignment operator will generate the (.) error. (Absolute
1033 program areas may use the .org directive to specify the absolute
1034 location of the current program counter.)
1036 The following coding illustrates the use of the current location
1039 .area CODE1 (ABS) ;program area CODE1
1042 .org 0H100 ;set location to
1045 num1: ldx #.+0H10 ;The label num1 has
1050 .org 0H130 ;location counter
1053 num2: ldy #. ;The label num2 has
1059 .area CODE2 (REL) ;program area CODE2
1062 . = . + 0H20 ;Set location counter
1063 ;to relocatable 0H20 of
1064 ;the program section.
1066 num3: .word 0 ;The label num3 has
1068 ;of relocatable 0H20.
1070 . = . + 0H40 ;will reserve 0H40
1071 ;bytes of storage as will
1075 The .blkb and .blkw directives are the preferred methods of
1080 THE ASSEMBLER PAGE 1-14
1081 SYMBOLS AND EXPRESSIONS
1087 ASxxxx assumes that all numbers in the source program are to
1088 be interpreted in decimal radix unless otherwise specified. The
1089 .radix directive may be used to specify the default as octal,
1090 decimal, or hexidecimal. Individual numbers can be designated
1091 as binary, octal, decimal, or hexidecimal through the temporary
1092 radix prefixes shown in table 6.
1094 Negative numbers must be preceeded by a minus sign; ASxxxx
1095 translates such numbers into two's complement form. Positive
1096 numbers may (but need not) be preceeded by a plus sign.
1098 Numbers are always considered to be absolute values, therefor
1099 they are never relocatable.
1105 A term is a component of an expression and may be one of the
1112 1. A period (.) specified in an expression causes the
1113 current location counter to be used.
1114 2. A User-defined symbol.
1115 3. An undefined symbol is assigned a value of zero and
1116 inserted in the User-Defined symbol table as an un-
1119 3. A single quote followed by a single ascii character, or
1120 a double quote followed by two ascii characters.
1122 4. An expression enclosed in parenthesis. Any expression
1123 so enclosed is evaluated and reduced to a single term
1124 before the remainder of the expression in which it ap-
1125 pears is evaluated. Parenthesis, for example, may be
1126 used to alter the left-to-right evaluation of expres-
1127 sions, (as in A*B+C versus A*(B+C)), or to apply a un-
1128 ary operator to an entire expression (as in -(A+B)).
1130 5. A unary operator followed by a symbol or number.
1136 THE ASSEMBLER PAGE 1-15
1137 SYMBOLS AND EXPRESSIONS
1143 Expressions are combinations of terms joined together by
1144 binary operators. Expressions reduce to a 16-bit value. The
1145 evaluation of an expression includes the determination of its
1146 attributes. A resultant expression value may be one of three
1147 types (as described later in this section): relocatable, ab-
1148 solute, and external.
1150 Expressions are evaluate with an operand hierarchy as follows:
1152 * / % multiplication,
1159 << >> left shift and
1162 ^ exclusive or fourth.
1164 & logical and fifth.
1168 except that unary operators take precedence over binary
1172 A missing or illegal operator terminates the expression
1173 analysis, causing error codes (o) and/or (q) to be generated
1174 depending upon the context of the expression itself.
1176 At assembly time the value of an external (global) expression
1177 is equal to the value of the absolute part of that expression.
1178 For example, the expression external+4, where 'external' is an
1179 external symbol, has the value of 4. This expression, however,
1180 when evaluated at link time takes on the resolved value of the
1181 symbol 'external', plus 4.
1183 Expressions, when evaluated by ASxxxx, are one of three
1184 types: relocatable, absolute, or external. The following dis-
1185 tinctions are important:
1187 1. An expression is relocatable if its value is fixed re-
1188 lative to the base address of the program area in which
1189 it appears; it will have an offset value added at link
1190 time. Terms that contain labels defined in relocatable
1191 program areas will have a relocatable value;
1194 THE ASSEMBLER PAGE 1-16
1195 SYMBOLS AND EXPRESSIONS
1198 similarly, a period (.) in a relocatable program area,
1199 representing the value of the current program location
1200 counter, will also have a relocatable value.
1202 2. An expression is absolute if its value is fixed. An
1203 expression whose terms are numbers and ascii characters
1204 will reduce to an absolute value. A relocatable ex-
1205 pression or term minus a relocatable term, where both
1206 elements being evaluated belong to the same program
1207 area, is an absolute expression. This is because every
1208 term in a program area has the same relocation bias.
1209 When one term is subtracted from the other the reloca-
1212 3. An expression is external (or global) if it contains a
1213 single global reference (plus or minus an absolute ex-
1214 pression value) that is not defined within the current
1215 program. Thus, an external expression is only par-
1216 tially defined following assembly and must be resolved
1221 1.4 GENERAL ASSEMBLER DIRECTIVES
1224 An ASxxxx directive is placed in the operator field of the
1225 source line. Only one directive is allowed per source line.
1226 Each directive may have a blank operand field or one or more
1227 operands. Legal operands differ with each directive.
1230 1.4.1 .module Directive
1236 The .module directive causes the string to be included in the
1237 assemblers output file as an identifier for this particular ob-
1238 ject module. The string may be from 1 to 8 characters in
1239 length. Only one identifier is allowed per assembled module.
1240 The main use of this directive is to allow the linker to report
1241 a modules' use of undefined symbols. At link time all undefined
1242 symbols are reported and the modules referencing them are
1248 THE ASSEMBLER PAGE 1-17
1249 GENERAL ASSEMBLER DIRECTIVES
1252 1.4.2 .title Directive
1258 The .title directive provides a character string to be placed
1259 on the second line of each page during listing.
1262 1.4.3 .sbttl Directive
1268 The .sbttl directive provides a character string to be placed
1269 on the third line of each page during listing.
1272 1.4.4 .page Directive
1278 The .page directive causes a page ejection with a new heading
1279 to be printed. The new page occurs after the next line of the
1280 source program is processed, this allows an immediately follow-
1281 ing .sbttl directive to appear on the new page. The .page
1282 source line will not appear in the file listing. Paging may be
1283 disabled by invoking the -p directive.
1286 1.4.5 .byte and .db Directives
1290 .byte exp ;Stores the binary value
1291 .db exp ;of the expression in the
1294 .byte exp1,exp2,expn ;Stores the binary values
1295 .db exp1,exp2,expn ;of the list of expressions
1296 ;in successive bytes.
1298 where: exp, represent expressions that will be
1299 exp1, truncated to 8-bits of data.
1300 . Each expression will be calculated
1301 . as a 16-bit word expression,
1302 . the high-order byte will be truncated.
1303 . Multiple expressions must be
1306 THE ASSEMBLER PAGE 1-18
1307 GENERAL ASSEMBLER DIRECTIVES
1310 expn separated by commas.
1312 The .byte or .db directives are used to generate successive
1313 bytes of binary data in the object module.
1316 1.4.6 .word and .dw Directives
1320 .word exp ;Stores the binary value
1321 .dw exp ;of the expression in
1324 .word exp1,exp2,expn ;Stores the binary values
1325 .dw exp1,exp2,expn ;of the list of expressions
1326 ;in successive words.
1328 where: exp, represent expressions that will occupy two
1329 exp1, bytes of data. Each expression will be
1330 . calculated as a 16-bit word expression.
1331 . Multiple expressions must be
1332 expn separated by commas.
1334 The .word or .dw directives are used to generate successive
1335 words of binary data in the object module.
1338 1.4.7 .blkb, .blkw, and .ds Directives
1342 .blkb N ;reserve N bytes of space
1343 .blkw N ;reserve N words of space
1344 .ds N ;reserve N bytes of space
1346 The .blkb and .ds directives reserve byte blocks in the ob-
1347 ject module; the .blkw directive reserves word blocks.
1350 1.4.8 .ascii Directive
1356 where: string is a string of printable ascii characters.
1358 / / represent the delimiting characters. These
1359 delimiters may be any paired printing
1360 characters, as long as the characters are not
1361 contained within the string itself. If the
1364 THE ASSEMBLER PAGE 1-19
1365 GENERAL ASSEMBLER DIRECTIVES
1368 delimiting characters do not match, the .ascii
1369 directive will give the (q) error.
1371 The .ascii directive places one binary byte of data for each
1372 character in the string into the object module.
1375 1.4.9 .ascis Directive
1381 where: string is a string of printable ascii characters.
1383 / / represent the delimiting characters. These
1384 delimiters may be any paired printing
1385 characters, as long as the characters are not
1386 contained within the string itself. If the
1387 delimiting characters do not match, the .ascis
1388 directive will give the (q) error.
1390 The .ascis directive places one binary byte of data for each
1391 character in the string into the object module. The last
1392 character in the string will have the high order bit set.
1395 1.4.10 .asciz Directive
1401 where: string is a string of printable ascii characters.
1403 / / represent the delimiting characters. These
1404 delimiters may be any paired printing
1405 characters, as long as the characters are not
1406 contained within the string itself. If the
1407 delimiting characters do not match, the .asciz
1408 directive will give the (q) error.
1410 The .asciz directive places one binary byte of data for each
1411 character in the string into the object module. Following all
1412 the character data a zero byte is inserted to terminate the
1418 THE ASSEMBLER PAGE 1-20
1419 GENERAL ASSEMBLER DIRECTIVES
1422 1.4.11 .radix Directive
1428 where: character represents a single character specifying the
1429 default radix to be used for succeeding numbers.
1430 The character may be any one of the following:
1444 1.4.12 .even Directive
1450 The .even directive ensures that the current location counter
1451 contains an even boundary value by adding 1 if the current loca-
1455 1.4.13 .odd Directive
1461 The .odd directive ensures that the current location counter
1462 contains an odd boundary value by adding one if the current lo-
1468 THE ASSEMBLER PAGE 1-21
1469 GENERAL ASSEMBLER DIRECTIVES
1472 1.4.14 .area Directive
1476 .area name [(options)]
1478 where: name represents the symbolic name of the program sec-
1479 tion. This name may be the same as any
1480 user-defined symbol as the area names are in-
1481 dependent of all symbols and labels.
1483 options specify the type of program or data area:
1484 ABS absolute (automatically invokes OVR)
1491 The .area directive provides a means of defining and separat-
1492 ing multiple programming and data sections. The name is the
1493 area label used by the assembler and the linker to collect code
1494 from various separately assembled modules into one section. The
1495 name may be from 1 to 8 characters in length.
1497 The options are specified within parenthesis and separated by
1498 commas as shown in the following example:
1500 .area TEST (REL,CON) ;This section is relocatable
1501 ;and concatenated with other
1502 ;sections of this program area.
1504 .area DATA (REL,OVR) ;This section is relocatable
1505 ;and overlays other sections
1506 ;of this program area.
1508 .area SYS (ABS,OVR) ;(CON not allowed with ABS)
1509 ;This section is defined as
1510 ;absolute. Absolute sections
1511 ;are always overlayed with
1512 ;other sections of this program
1515 .area PAGE (PAG) ;This is a paged section. The
1516 ;section must be on a 256 byte
1517 ;boundary and its length is
1518 ;checked by the linker to be
1519 ;no larger than 256 bytes.
1520 ;This is useful for direct page
1525 THE ASSEMBLER PAGE 1-22
1526 GENERAL ASSEMBLER DIRECTIVES
1529 The default area type is REL|CON; i.e. a relocatable sec-
1530 tion which is concatenated with other sections of code with the
1531 same area name. The ABS option indicates an absolute area. The
1532 OVR and CON options indicate if program sections of the same
1533 name will overlay each other (start at the same location) or be
1534 concatenated with each other (appended to each other).
1536 Multiple invocations of the .area directive with the same
1537 name must specify the same options or leave the options field
1538 blank, this defaults to the previously specified options for
1540 The ASxxxx assemblers automatically provide two program
1543 '. .ABS.' This dumby section contains all absolute
1544 symbols and their values.
1546 '_CODE' This is the default program/data area.
1547 This program area is of type (REL,CON).
1548 The ASxxxx assemblers also automatically generate two symbols
1549 for each program area:
1551 's_<area>' This is the starting address of the pro-
1554 indent -16 'l_<area>' This is the
1555 length of the program area.
1558 1.4.15 .org Directive
1564 where: exp is an absolute expression that becomes the cur-
1565 rent location counter.
1567 The .org directive is valid only in an absolute program section
1568 and will give a (q) error if used in a relocatable program area.
1569 The .org directive specifies that the current location counter
1570 is to become the specified absolute value.
1575 THE ASSEMBLER PAGE 1-23
1576 GENERAL ASSEMBLER DIRECTIVES
1579 1.4.16 .globl Directive
1583 .globl sym1,sym2,...,symn
1585 where: sym1, represent legal symbolic names. When
1586 sym2,... When multiple symbols are specified,
1587 symn they are separated by commas.
1589 A .globl directive may also have a label field and/or a com-
1592 The .globl directive is provided to define (and thus provide
1593 linkage to) symbols not otherwise defined as global symbols
1594 within a module. In defining global symbols the directive
1595 .globl J is similar to:
1597 J == expression or J::
1599 Because object modules are linked by global symbols, these
1600 symbols are vital to a program. All internal symbols appearing
1601 within a given program must be defined at the end of pass 1 or
1602 they will be considered undefined. The assembly directive (-g)
1603 can be be invoked to make all undefined symbols global at the
1607 1.4.17 .if, .else, and .endif Directives
1613 . ;} range of true condition
1617 . ;} range of false condition
1621 The conditional assembly directives allow you to include or
1622 exclude blocks of source code during the assembly process, based
1623 on the evaluation of the condition test.
1625 The range of true condition will be processed if the expres-
1626 sion 'expr' is not zero (i.e. true) and the range of false con-
1627 dition will be processed if the expression 'expr' is zero (i.e
1628 false). The range of true condition is optional as is the .else
1629 directive and the range of false condition. The following are
1630 all valid .if/.else/.endif constructions:
1633 THE ASSEMBLER PAGE 1-24
1634 GENERAL ASSEMBLER DIRECTIVES
1638 .if A-4 ;evaluate A-4
1639 .byte 1,2 ;insert bytes if A-4 is
1642 .if K+3 ;evaluate K+3
1644 .byte 3,4 ;insert bytes if K+3
1647 .if J&3 ;evaluate J masked by 3
1648 .byte 12 ;insert this byte if J&3
1650 .byte 13 ;insert this byte if J&3
1654 The .if/.else/.endif directives may be nested upto 10 levels.
1656 The .page directive is processed within a false condition
1657 range to allow extended textual information to be incorporated
1658 in the source program with out the need to use the comment
1664 This text will be bypassed during assembly
1665 but appear in the listing file.
1673 1.4.18 .include Directive
1679 where: string represents a delimited string that is the file
1680 specification of an ASxxxx source file.
1682 The .include directive is used to insert a source file within
1683 the source file currently being assembled. When this directive
1684 is encountered, an implicit .page directive is issued. When the
1685 end of the specified source file is reached, an implicit .page
1686 directive is issued and input continues from the previous source
1687 file. The maximum nesting level of source files specified by a
1688 .include directive is five.
1691 THE ASSEMBLER PAGE 1-25
1692 GENERAL ASSEMBLER DIRECTIVES
1695 The total number of separately specified .include files is
1696 unlimited as each .include file is opened and then closed during
1697 each pass made by the assembler.
1700 1.4.19 .setdp Directive
1704 .setdp [base [,area]]
1706 The set direct page directive has a common format in all the
1707 AS68xx assemblers. The .setdp directive is used to inform the
1708 assembler of the current direct page region and the offset ad-
1709 dress within the selected area. The normal invocation methods
1719 for all the 68xx microprocessors (the 6804 has only the paged
1720 ram area). The commands specify that the direct page is in area
1721 DIRECT and its offset address is 0 (the only valid value for all
1722 but the 6809 microprocessor). Be sure to place the DIRECT area
1723 at address 0 during linking. When the base address and area are
1724 not specified, then zero and the current area are the defaults.
1725 If a .setdp directive is not issued the assembler defaults the
1726 direct page to the area "_CODE" at offset 0.
1728 The assembler verifies that any local variable used in a
1729 direct variable reference is located in this area. Local vari-
1730 able and constant value direct access addresses are checked to
1731 be within the address range from 0 to 255.
1733 External direct references are assumed by the assembler to be
1734 in the correct area and have valid offsets. The linker will
1735 check all direct page relocations to verify that they are within
1738 The 6809 microprocessor allows the selection of the direct
1739 page to be on any 256 byte boundary by loading the appropriate
1740 value into the dp register. Typically one would like to select
1741 the page boundary at link time, one method follows:
1744 THE ASSEMBLER PAGE 1-26
1745 GENERAL ASSEMBLER DIRECTIVES
1748 .area DIRECT (PAG) ; define the direct page
1755 ldd #DIRECT ; load the direct page register
1756 tfr a,dp ; for access to the direct page
1758 At link time specify the base and global equates to locate the
1764 Both the area address and offset value must be specified (area
1765 and variable names are independent). The linker will verify
1766 that the relocated direct page accesses are within the direct
1768 The preceeding sequence could be repeated for multiple paged
1769 areas, however an alternate method is to define a non-paged area
1770 and use the .setdp directive to specify the offset value:
1772 .area DIRECT ; define non-paged area
1778 .setdp 0,DIRECT ; direct page area
1779 ldd #DIRECT ; load the direct page register
1780 tfr a,dp ; for access to the direct page
1783 .setdp 0x100,DIRECT ; direct page area
1784 ldd #DIRECT+0x100 ; load the direct page register
1785 tfr a,dp ; for access to the direct page
1787 The linker will verify that subsequent direct page references
1788 are in the specified area and offset address range. It is the
1789 programmers responsibility to load the dp register with the cor-
1790 rect page segment corresponding to the .setdp base address
1793 For those cases where a single piece of code must access a
1794 defined data structure within a direct page and there are many
1795 pages, define a dumby direct page linked at address 0. This
1796 dumby page is used only to define the variable labels. Then
1797 load the dp register with the real base address but donot use a
1798 .setdp directive. This method is equivalent to indexed
1801 THE ASSEMBLER PAGE 1-27
1802 GENERAL ASSEMBLER DIRECTIVES
1805 addressing, where the dp register is the index register and the
1806 direct addressing is the offset.
1812 The ASxxxx assemblers are command line oriented. After the
1813 assembler is started, enter the option(s) and file(s) to assem-
1814 ble following the 'argv:' prompt:
1816 argv: [-dqxjgalcposf] file1 [file2 file3 ... file6]
1822 x hex listing (default)
1824 The listing radix affects the
1825 .lst, .rel, and .sym files.
1827 j add line number and debug information to file
1828 g undefined symbols made global
1829 a all user symbols made global
1831 l create list output file1.lst
1832 o create object output file1.rel
1833 s create symbol output file1.sym
1835 p disable listing pagination
1837 relocatable reference flagging:
1839 f by ` in the listing file
1840 ff by mode in the listing file
1842 asx8051 specific command line option:
1843 -I<dir> Add the named directory to the include file
1844 search path. This option may be used more than once.
1845 Directories are searched in the order given.
1847 The file name for the .lst, .rel, and .sym files is the first
1848 file name specified in the command line. All output files are
1849 ascii text files which may be edited, copied, etc. The output
1850 files are the concatenation of all the input files, if files are
1851 to be assembled independently invoke the assembler for each
1854 The .rel file contains a radix directive so that the linker
1855 will use the proper conversion for this file. Linked files may
1856 have different radices.
1858 If the list (l) option is specified without the symbol table
1859 (s) option, the symbol table is placed at the end of the listing
1862 ASXXXX assembles supported by and distributed with SDCC are:
1863 asx8051 (Intel 8051)
1864 as-z80 (Zilog Z80 / Hitachi HD64180)
1865 as-gbz80 (GameBoy Z80-like CPU)
1866 as-hc08 (Motorola 68HC08)
1869 THE ASSEMBLER PAGE 1-28
1876 The ASxxxx assemblers provide limited diagnostic error codes
1877 during the assembly process, these errors will be noted in the
1878 listing file and printed on the stderr device.
1880 The assembler reports the errors on the stderr device as
1882 ?ASxxxx-Error-<*> in line nnn of filename
1884 where * is the error code, nnn is the line number, and filename
1885 is the source/include file.
1889 (.) This error is caused by an absolute direct assign-
1890 ment of the current location counter
1891 . = expression (incorrect)
1892 rather than the correct
1895 (a) Indicates a machine specific addressing or address-
1898 (b) Indicates a direct page boundary error.
1900 (d) Indicates a direct page addressing error.
1902 (i) Caused by an .include file error or an .if/.endif
1905 (m) Multiple definitions of the same label, multiple
1906 .module directives, or multiple conflicting attri-
1907 butes in an .area directive.
1909 (o) Directive or mnemonic error or the use of the .org
1910 directive in a relocatable area.
1912 (p) Phase error: label location changing between passes
1913 2 and 3. Normally caused by having more than one
1914 level of forward referencing.
1916 (q) Questionable syntax: missing or improper operators,
1917 terminators, or delimiters.
1919 (r) Relocation error: logic operation attempted on a
1920 relocatable term, addition of two relocatable terms,
1921 subtraction of two relocatable terms not within the
1922 same programming area or external symbols.
1924 (u) Undefined symbol encountered during assembly.
1927 THE ASSEMBLER PAGE 1-29
1934 The (-l) option produces an ascii output listing file. Each
1935 page of output contains a four line header:
1938 1. The ASxxxx program name and page number
1940 2. Title from a .title directive (if any)
1942 3. Subtitle from a .sbttl directive (if any)
1948 Each succeeding line contains five fields:
1951 1. Error field (first three characters of line)
1953 2. Current location counter
1955 3. Generated code in byte format
1957 4. Source text line number
1962 The error field may contain upto 2 error flags indicating any
1963 errors encountered while assembling this line of source code.
1965 The current location counter field displays the 16-bit pro-
1966 gram position. This field will be in the selected radix.
1968 The generated code follows the program location. The listing
1969 radix determines the number of bytes that will be displayed in
1970 this field. Hexidecimal listing allows six bytes of data within
1971 the field, decimal and octal allow four bytes within the field.
1972 If more than one field of data is generated from the assembly of
1973 a single line of source code, then the data field is repeated on
1976 The source text line number is printed in decimal and is fol-
1977 lowed by the source text.
1979 Two special cases will disable the listing of a line of
1984 THE ASSEMBLER PAGE 1-30
1988 1. Source line with a .page directive is never listed.
1990 2. Source line with a .include file directive is not
1991 listed unless the .include file cannot be opened.
1994 Two data field options are available to flag those bytes
1995 which will be relocated by the linker. If the -f option is
1996 specified then each byte to be relocated will be preceeded by
1997 the '`' character. If the -ff option is specified then each
1998 byte to be relocated will be preceeded by one of the following
2001 1. * paged relocation
2003 2. u low byte of unsigned word or unsigned byte
2005 3. v high byte of unsigned word
2007 4. p PCR low byte of word relocation or PCR byte
2009 5. q PCR high byte of word relocation
2011 6. r low byte relocation or byte relocation
2013 7. s high byte relocation
2017 1.8 SYMBOL TABLE FILE
2020 The symbol table has two parts:
2022 1. The alphabetically sorted list of symbols and/or labels
2023 defined or referenced in the source program.
2025 2. A list of the program areas defined during assembly of
2029 The sorted list of symbols and/or labels contains the follow-
2032 1. Program area number (none if absolute value or exter-
2035 2. The symbol or label
2037 3. Directly assigned symbol is denoted with an (=) sign
2041 THE ASSEMBLER PAGE 1-31
2045 4. The value of a symbol, location of a label relative to
2046 the program area base address (=0), or a **** indicat-
2047 ing the symbol or label is undefined.
2049 5. The characters: G - global, R - relocatable, and X -
2053 The list of program areas provides the correspondence between
2054 the program area numbers and the defined program areas, the size
2055 of the program areas, and the area flags (attributes).
2061 The object file is an ascii file containing the information
2062 needed by the linker to bind multiple object modules into a com-
2063 plete loadable memory image. The object module contains the
2064 following designators:
2071 H Most significant byte first
2072 L Least significant byte first
2079 R Relocation information
2080 P Paging information
2082 Refer to the linker for a detailed description of each of the
2083 designators and the format of the information contained in the
2107 2.1 ASLINK RELOCATING LINKER
2110 ASLINK is the companion linker for the ASxxxx assemblers.
2112 The program ASLINK is a general relocating linker performing
2113 the following functions:
2115 1. Bind multiple object modules into a single memory image
2117 2. Resolve inter-module symbol references
2119 3. Combine code belonging to the same area from multiple
2120 object files into a single contiguous memory region
2122 4. Search and import object module libraries for undefined
2125 5. Perform byte and word program counter relative
2126 (pc or pcr) addressing calculations
2128 6. Define absolute symbol values at link time
2130 7. Define absolute area base address values at link time
2132 8. Produce Intel Hex or Motorola S19 output file
2134 9. Produce a map of the linked memory image
2136 10. Produce an updated listing file with the relocated ad-
2150 The linker may run in the command line mode or command file
2151 modes. The allowed startup linker commands are:
2153 -c/-f command line / command file modes
2155 -p/-n enable/disable echo file.lnk input to stdout
2157 If command line mode is selected, all linker commands come
2158 from stdin, if the command file mode is selected the commands
2159 are input from the specified file (extension must be .lnk).
2161 The linker is started via
2165 After invoking the linker the valid options are:
2167 1. -i/-s Intel Hex (file.ihx) or Motorola S19 (file.s19)
2170 2. -m Generate a map file (file.map). This file con-
2171 tains a list of the symbols (by area) with absolute ad-
2172 dresses, sizes of linked areas, and other linking
2175 3. -u Generate an updated listing file (file.rst)
2176 derived from the relocated addresses and data from the
2179 4. -xdq Specifies the number radix for the map file
2180 (Hexidecimal, Decimal, or Octal).
2182 5. fileN Files to be linked. Files may be on the same
2183 line as the above options or on a separate line(s) one
2184 file per line or multiple files separated by spaces or
2187 6. -b area = expression (one definition per line)
2188 This specifies an area base address where the expres-
2189 sion may contain constants and/or defined symbols from
2192 7. -g symbol = expression (one definition per line)
2193 This specifies the value for the symbol where the ex-
2194 pression may contain constants and/or defined symbols
2195 from the linked files.
2197 8. -k library directory path
2198 (one definition per line) This specifies one possible
2205 path to an object library. More than one path is al-
2208 9. -l library file specification
2209 (one definition per line) This specifies a possible
2210 library file. More than one file is allowed.
2212 10. -e or null line, terminates input to the linker.
2216 2.3 LIBRARY PATH(S) AND FILE(S)
2219 The process of resolving undefined symbols after scanning the
2220 input object files includes the scanning of object module
2221 libraries. The linker will search through all combinations of
2222 the library path specifications (input by the -k option) and the
2223 library file specifications (input by the -l option) that lead
2224 to an existing library file. Each library file contains a list
2225 (one file per line) of modules included in this particular
2226 library. Each existing object module is scanned for a match to
2227 the undefined symbol. The first module containing the symbol is
2228 then linked with the previous modules to resolve the symbol de-
2229 finition. The library object modules are rescanned until no
2230 more symbols can be resolved. The scanning algorithm allows
2231 resolution of back references. No errors are reported for non
2232 existant library files or object modules.
2234 The library file specification may be formed in one of two
2237 1. If the library file contained an absolute path/file
2238 specification then this is the object module's
2242 2. If the library file contains a relative path/file
2243 specification then the concatenation of the path and
2244 this file specification becomes the object module's
2249 As an example, assume there exists a library file termio.lib
2250 in the syslib directory specifying the following object modules:
2252 \6809\io_disk first object module
2253 d:\special\io_comm second object module
2255 and the following parameters were specified to the linker:
2260 LIBRARY PATH(S) AND FILE(S)
2263 -k c:\iosystem\ the first path
2264 -k c:\syslib\ the second path
2266 -l termio the first library file
2267 -l io the second library file (no such file)
2269 The linker will attempt to use the following object modules to
2270 resolve any undefined symbols:
2272 c:\syslib\6809\io_disk.rel (concatenated path/file)
2273 d:\special\io_comm.rel (absolute path/file)
2275 all other path(s)/file(s) don't exist. (No errors are reported
2276 for non existant path(s)/file(s).)
2279 2.4 ASLINK PROCESSING
2282 The linker processes the files in the order they are
2283 presented. The first pass through the input files is used to
2284 define all program areas, the section area sizes, and symbols
2285 defined or referenced. Undefined symbols will initiate a search
2286 of any specified library file(s) and the importing of the module
2287 containing the symbol definition. After the first pass the -b
2288 (area base address) definitions, if any, are processed and the
2291 The area linking proceeds by first examining the area types
2292 ABS, CON, REL, OVR and PAG. Absolute areas (ABS) from separate
2293 object modules are always overlayed and have been assembled at a
2294 specific address, these are not normally relocated (if a -b com-
2295 mand is used on an absolute area the area will be relocated).
2296 Relative areas (normally defined as REL|CON) have a base address
2297 of 0x0000 as read from the object files, the -b command speci-
2298 fies the beginning address of the area. All subsequent relative
2299 areas will be concatenated with proceeding relative areas.
2300 Where specific ordering is desired, the first linker input file
2301 should have the area definitions in the desired order. At the
2302 completion of the area linking all area addresses and lengths
2303 have been determined. The areas of type PAG are verified to be
2304 on a 256 byte boundary and that the length does not exceed 256
2305 bytes. Any errors are noted on stderr and in the map file.
2307 Next the global symbol definitions (-g option), if any, are
2308 processed. The symbol definitions have been delayed until this
2309 point because the absolute addresses of all internal symbols are
2310 known and can be used in the expression calculations.
2312 Before continuing with the linking process the symbol table
2313 is scanned to determine if any symbols have been referenced but
2314 not defined. Undefined symbols are listed on the stderr device.
2321 if a .module directive was included in the assembled file the
2322 module making the reference to this undefined variable will be
2325 Constants defined as global in more than one module will be
2326 flagged as multiple definitions if their values are not identi-
2329 After the preceeding processes are complete the linker may
2330 output a map file (-m option). This file provides the following
2333 1. Global symbol values and label absolute addresses
2335 2. Defined areas and there lengths
2337 3. Remaining undefined symbols
2339 4. List of modules linked
2341 5. List of library modules linked
2343 6. List of -b and -g definitions
2348 The final step of the linking process is performed during the
2349 second pass of the input files. As the xxx.rel files are read
2350 the code is relocated by substituting the physical addresses for
2351 the referenced symbols and areas and may be output in Intel or
2352 Motorola formats. The number of files linked and symbols de-
2353 fined/referenced is limited by the processor space available to
2354 build the area/symbol lists. If the -u option is specified then
2355 the listing files (file.lst) associated with the relocation
2356 files (file.rel) are scanned and used to create a new file
2357 (file.rst) which has all addresses and data relocated to their
2361 2.5 LINKER INPUT FORMAT
2364 The linkers' input object file is an ascii file containing
2365 the information needed by the linker to bind multiple object
2366 modules into a complete loadable memory image.
2368 The object module contains the following designators:
2381 H Most significant byte first
2382 L Least significant byte first
2389 R Relocation information
2390 P Paging information
2393 2.5.1 Object Module Format
2396 The first line of an object module contains the [XDQ][HL]
2397 format specifier (i.e. XH indicates a hexidecimal file with
2398 most significant byte first) for the following designators.
2403 H aa areas gg global symbols
2405 The header line specifies the number of areas(aa) and the
2406 number of global symbols(gg) defined or referenced in this ob-
2407 ject module segment.
2414 The module line specifies the module name from which this
2415 header segment was assembled. The module line will not appear
2416 if the .module directive was not used in the source program.
2427 The symbol line defines (Def) or references (Ref) the symbol
2428 'string' with the value nnnn. The defined value is relative to
2429 the current area base address. References to constants and
2430 external global symbols will always appear before the first area
2437 definition. References to external symbols will have a value of
2443 A label size ss flags ff
2445 The area line defines the area label, the size (ss) of the
2446 area in bytes, and the area flags (ff). The area flags specify
2447 the ABS, REL, CON, OVR, and PAG parameters:
2449 OVR/CON (0x04/0x00 i.e. bit position 2)
2451 ABS/REL (0x08/0x00 i.e. bit position 3)
2453 PAG (0x10 i.e. bit position 4)
2458 T xx xx nn nn nn nn nn ...
2460 The T line contains the assembled code output by the assem-
2461 bler with xx xx being the offset address from the current area
2462 base address and nn being the assembled instructions and data in
2468 R 0 0 nn nn n1 n2 xx xx ...
2470 The R line provides the relocation information to the linker.
2471 The nn nn value is the current area index, i.e. which area the
2472 current values were assembled. Relocation information is en-
2473 coded in groups of 4 bytes:
2475 1. n1 is the relocation mode and object format
2476 1. bit 0 word(0x00)/byte(0x01)
2477 2. bit 1 relocatable area(0x00)/symbol(0x02)
2478 3. bit 2 normal(0x00)/PC relative(0x04) relocation
2479 4. bit 3 1-byte(0x00)/2-byte(0x08) object format for
2481 5. bit 4 signed(0x00)/unsigned(0x10) byte data
2482 6. bit 5 normal(0x00)/page '0'(0x20) reference
2483 7. bit 6 normal(0x00)/page 'nnn'(0x40) reference
2484 8. bit 7 LSB byte(0x00)/MSB byte(0x80) with 2-byte
2487 2. n2 is a byte index into the corresponding (i.e. pre-
2488 ceeding) T line data (i.e. a pointer to the data to be
2495 updated by the relocation). The T line data may be
2496 1-byte or 2-byte byte data format or 2-byte word
2499 3. xx xx is the area/symbol index for the area/symbol be-
2500 ing referenced. the corresponding area/symbol is found
2501 in the header area/symbol lists.
2504 The groups of 4 bytes are repeated for each item requiring relo-
2505 cation in the preceeding T line.
2510 P 0 0 nn nn n1 n2 xx xx
2512 The P line provides the paging information to the linker as
2513 specified by a .setdp directive. The format of the relocation
2514 information is identical to that of the R line. The correspond-
2515 ing T line has the following information:
2518 Where aa aa is the area reference number which specifies the
2519 selected page area and bb bb is the base address of the page.
2520 bb bb will require relocation processing if the 'n1 n2 xx xx' is
2521 specified in the P line. The linker will verify that the base
2522 address is on a 256 byte boundary and that the page length of an
2523 area defined with the PAG type is not larger than 256 bytes.
2525 The linker defaults any direct page references to the first
2526 area defined in the input REL file. All ASxxxx assemblers will
2527 specify the _CODE area first, making this the default page area.
2530 2.6 LINKER ERROR MESSAGES
2533 The linker provides detailed error messages allowing the pro-
2534 grammer to quickly find the errant code. As the linker com-
2535 pletes pass 1 over the input file(s) it reports any page
2536 boundary or page length errors as follows:
2538 ?ASlink-Warning-Paged Area PAGE0 Boundary Error
2542 ?ASlink-Warning-Paged Area PAGE0 Length Error
2544 where PAGE0 is the paged area.
2549 LINKER ERROR MESSAGES
2552 During Pass two the linker reads the T, R, and P lines per-
2553 forming the necessary relocations and outputting the absolute
2554 code. Various errors may be reported during this process
2555 The P line processing can produce only one possible error:
2557 ?ASlink-Warning-Page Definition Boundary Error
2558 file module pgarea pgoffset
2559 PgDef t6809l t6809l PAGE0 0001
2561 The error message specifies the file and module where the .setdp
2562 direct was issued and indicates the page area and the page
2563 offset value determined after relocation.
2566 The R line processing produces various errors:
2568 ?ASlink-Warning-Byte PCR relocation error for symbol bra2
2569 file module area offset
2570 Refby t6809l t6809l TEST 00FE
2571 Defin tconst tconst . .ABS. 0080
2573 ?ASlink-Warning-Unsigned Byte error for symbol two56
2574 file module area offset
2575 Refby t6800l t6800l DIRECT 0015
2576 Defin tconst tconst . .ABS. 0100
2578 ?ASlink-Warning-Page0 relocation error for symbol ltwo56
2579 file module area offset
2580 Refby t6800l t6800l DIRECT 000D
2581 Defin tconst tconst DIRECT 0100
2583 ?ASlink-Warning-Page Mode relocation error for symbol two56
2584 file module area offset
2585 Refby t6809l t6809l DIRECT 0005
2586 Defin tconst tconst . .ABS. 0100
2588 ?ASlink-Warning-Page Mode relocation error
2589 file module area offset
2590 Refby t Pagetest PROGRAM 0006
2591 Defin t Pagetest DIRECT 0100
2593 These error messages specify the file, module, area, and offset
2594 within the area of the code referencing (Refby) and defining
2595 (Defin) the symbol. If the symbol is defined in the same module
2596 as the reference the linker is unable to report the symbol name.
2597 The assembler listing file(s) should be examined at the offset
2598 from the specified area to located the offending code.
2602 1. The byte PCR error is caused by exceeding the pc rela-
2603 tive byte branch range.
2606 THE LINKER PAGE 2-10
2607 LINKER ERROR MESSAGES
2610 2. The Unsigned byte error indicates an indexing value was
2611 negative or larger than 255.
2613 3. The Page0 error is generated if the direct page vari-
2614 able is not in the page0 range of 0 to 255.
2616 4. The page mode error is generated if the direct variable
2617 is not within the current direct page (6809).
2621 THE LINKER Page 2-11
2622 INTEL HEX OUTPUT FORMAT
2625 2.7 INTEL HEX OUTPUT FORMAT
2627 Record Mark Field - This field signifies the start of a
2628 record, and consists of an ascii colon
2631 Record Length Field - This field consists of two ascii
2632 characters which indicate the number of
2633 data bytes in this record. The
2634 characters are the result of converting
2635 the number of bytes in binary to two
2636 ascii characters, high digit first. An
2637 End of File record contains two ascii
2638 zeros in this field.
2640 Load Address Field - This field consists of the four ascii
2641 characters which result from converting
2642 the the binary value of the address in
2643 which to begin loading this record. The
2644 order is as follows:
2646 High digit of high byte of address.
2647 Low digit of high byte of address.
2648 High digit of low byte of address.
2649 Low digit of low byte of address.
2651 In an End of File record this field con-
2652 sists of either four ascii zeros or the
2653 program entry address. Currently the
2654 entry address option is not supported.
2656 Record Type Field - This field identifies the record type,
2657 which is either 0 for data records or 1
2658 for an End of File record. It consists
2659 of two ascii characters, with the high
2660 digit of the record type first, followed
2661 by the low digit of the record type.
2663 Data Field - This field consists of the actual data,
2664 converted to two ascii characters, high
2665 digit first. There are no data bytes in
2666 the End of File record.
2668 Checksum Field - The checksum field is the 8 bit binary
2669 sum of the record length field, the load
2670 address field, the record type field,
2671 and the data field. This sum is then
2672 negated (2's complement) and converted
2673 to two ascii characters, high digit
2677 THE LINKER Page 2-12
2678 MOTOROLA S1-S9 OUTPUT FORMAT
2681 2.8 MOTORLA S1-S9 OUTPUT FORMAT
2683 Record Type Field - This field signifies the start of a
2684 record and identifies the the record
2687 Ascii S1 - Data Record
2688 Ascii S9 - End of File Record
2690 Record Length Field - This field specifies the record length
2691 which includes the address, data, and
2692 checksum fields. The 8 bit record
2693 length value is converted to two ascii
2694 characters, high digit first.
2696 Load Address Field - This field consists of the four ascii
2697 characters which result from converting
2698 the the binary value of the address in
2699 which to begin loading this record. The
2700 order is as follows:
2702 High digit of high byte of address.
2703 Low digit of high byte of address.
2704 High digit of low byte of address.
2705 Low digit of low byte of address.
2707 In an End of File record this field con-
2708 sists of either four ascii zeros or the
2709 program entry address. Currently the
2710 entry address option is not supported.
2712 Data Field - This field consists of the actual data,
2713 converted to two ascii characters, high
2714 digit first. There are no data bytes in
2715 the End of File record.
2717 Checksum Field - The checksum field is the 8 bit binary
2718 sum of the record length field, the load
2719 address field, and the data field. This
2720 sum is then complemented (1's comple-
2721 ment) and converted to two ascii
2722 characters, high digit first.
2739 BUILDING ASXXXX AND ASLINK
2744 The assemblers and linker have been successfully compiled us-
2745 ing the DECUS C (PDP-11) compiler (patch level 9) with
2746 RT-11/TSX+, Eyring Research Institute, Inc. PDOS (680x0) C
2747 V5.4b compiler, and Symantec C/C++ V6.1/V7.0.
2749 The device specific header file (i.e. m6800.h, m6801.h,
2750 etc.) contains the DECUS C 'BUILD' directives for generating a
2751 command file to compile, assemble, and link the necessary files
2752 to prepare an executable image for a particular assembler.
2755 3.1 BUILDING AN ASSEMBLER
2758 The building of a typical assembler (6809 for example) re-
2759 quires the following files:
2777 The first five files are the 6809 processor dependent sec-
2778 tions which contain the following:
2783 BUILDING ASXXXX AND ASLINK PAGE 3-2
2784 BUILDING AN ASSEMBLER
2787 1. m6809.h - header file containing the machine specific
2788 definitions of constants, variables, structures, and
2791 2. m09ext - device description, byte order, and file ex-
2794 3. m09pst - a table of the assembler general directives,
2795 special device directives, and assembler mnemonics with
2796 associated operation codes
2798 4. m09mch / m09adr - machine specific code for processing
2799 the device mnemonics, addressing modes, and special
2803 The remaining nine files provide the device independent sec-
2804 tions which handle the details of file input/output, symbol
2805 table generation, program/data areas, expression analysis, and
2806 assembler directive processing.
2808 The assembler defaults to the not case sensitive mode. This
2809 may be altered by changing the case sensitivity flag in asm.h to
2812 * Case Sensitivity Flag
2814 #define CASE_SENSITIVE 1
2816 The assemblers and linker should be compiled with the same
2817 case sensitivity option.
2823 The building of the linker requires the following files:
2841 BUILDING ASXXXX AND ASLINK PAGE 3-3
2845 The linker defaults to the not case sensitive mode. This may
2846 be altered by changing the case sensitivity flag in aslink.h to
2849 * Case Sensitivity Flag
2851 #define CASE_SENSITIVE 1
2853 The linker and assemblers should be compiled with the same
2854 case sensitivity option.
2877 A.1 6800 REGISTER SET
2879 The following is a list of the 6800 registers used by AS6800:
2881 a,b - 8-bit accumulators
2885 A.2 6800 INSTRUCTION SET
2888 The following tables list all 6800/6802/6808 mnemonics recog-
2889 nized by the AS6800 assembler. The designation [] refers to a
2890 required addressing mode argument. The following list specifies
2891 the format for each addressing mode supported by AS6800:
2893 #data immediate data
2896 *dir direct page addressing
2897 (see .setdp directive)
2900 ,x register indirect addressing
2903 offset,x register indirect addressing
2906 ext extended addressing
2910 The terms data, dir, offset, ext, and label may all be expres-
2915 AS6800 ASSEMBLER PAGE A-2
2916 6800 INSTRUCTION SET
2919 Note that not all addressing modes are valid with every in-
2920 struction, refer to the 6800 technical data for valid modes.
2923 A.2.1 Inherent Instructions
2945 A.2.2 Branch Instructions
2958 AS6800 ASSEMBLER PAGE A-3
2959 6800 INSTRUCTION SET
2962 A.2.3 Single Operand Instructions
3013 AS6800 ASSEMBLER PAGE A-4
3014 6800 INSTRUCTION SET
3017 A.2.4 Double Operand Instructions
3053 A.2.5 Jump and Jump to Subroutine Instructions
3060 AS6800 ASSEMBLER PAGE A-5
3061 6800 INSTRUCTION SET
3064 A.2.6 Long Register Instructions
3091 B.1 .hd6303 DIRECTIVE
3097 The .hd6303 directive enables processing of the HD6303 specific
3098 mnemonics not included in the 6801 instruction set. HD6303
3099 mnemonics encountered without the .hd6303 directive will be
3100 flagged with an 'o' error.
3103 B.2 6801 REGISTER SET
3105 The following is a list of the 6801 registers used by AS6801:
3107 a,b - 8-bit accumulators
3108 d - 16-bit accumulator <a:b>
3112 B.3 6801 INSTRUCTION SET
3115 The following tables list all 6801/6303 mnemonics recognized
3116 by the AS6801 assembler. The designation [] refers to a re-
3117 quired addressing mode argument. The following list specifies
3118 the format for each addressing mode supported by AS6801:
3120 #data immediate data
3123 *dir direct page addressing
3124 (see .setdp directive)
3129 AS6801 ASSEMBLER PAGE B-2
3130 6801 INSTRUCTION SET
3133 ,x register indirect addressing
3136 offset,x register indirect addressing
3139 ext extended addressing
3143 The terms data, dir, offset, ext, and label may all be expres-
3146 Note that not all addressing modes are valid with every in-
3147 struction, refer to the 6801/6303 technical data for valid
3151 B.3.1 Inherent Instructions
3169 B.3.2 Branch Instructions
3183 AS6801 ASSEMBLER PAGE B-3
3184 6801 INSTRUCTION SET
3187 B.3.3 Single Operand Instructions
3241 AS6801 ASSEMBLER PAGE B-4
3242 6801 INSTRUCTION SET
3254 B.3.4 Double Operand Instructions
3259 adda [] addb [] addd []
3260 add a [] add b [] add d []
3283 suba [] subb [] subd []
3284 sub a [] sub b [] sub d []
3289 AS6801 ASSEMBLER PAGE B-5
3290 6801 INSTRUCTION SET
3293 B.3.5 Jump and Jump to Subroutine Instructions
3298 B.3.6 Long Register Instructions
3306 B.3.7 6303 Specific Instructions
3308 aim #data, [] eim #data, []
3309 oim #data, [] tim #data, []
3333 Requires the .setdp directive to specify the ram area.
3336 C.1 6804 REGISTER SET
3338 The following is a list of the 6804 registers used by AS6804:
3340 x,y - index registers
3343 C.2 6804 INSTRUCTION SET
3346 The following tables list all 6804 mnemonics recognized by
3347 the AS6804 assembler. The designation [] refers to a required
3348 addressing mode argument. The following list specifies the
3349 format for each addressing mode supported by AS6804:
3351 #data immediate data
3354 ,x register indirect addressing
3356 dir direct addressing
3357 (see .setdp directive)
3360 ext extended addressing
3364 The terms data, dir, and ext may be expressions. The label for
3365 the short branchs beq, bne, bcc, and bcs must not be external.
3367 Note that not all addressing modes are valid with every in-
3368 struction, refer to the 6804 technical data for valid modes.
3371 AS6804 ASSEMBLER PAGE C-2
3372 6804 INSTRUCTION SET
3375 C.2.1 Inherent Instructions
3386 C.2.2 Branch Instructions
3392 C.2.3 Single Operand Instructions
3404 C.2.4 Jump and Jump to Subroutine Instructions
3410 C.2.5 Bit Test Instructions
3412 brclr #data,[],label
3413 brset #data,[],label
3421 AS6804 ASSEMBLER PAGE C-3
3422 6804 INSTRUCTION SET
3425 C.2.6 Load Immediate data Instruction
3430 C.2.7 6804 Derived Instructions
3477 D.1 6805 REGISTER SET
3479 The following is a list of the 6805 registers used by AS6805:
3481 a - 8-bit accumulator
3485 D.2 6805 INSTRUCTION SET
3488 The following tables list all 6805 mnemonics recognized by
3489 the AS6805 assembler. The designation [] refers to a required
3490 addressing mode argument. The following list specifies the
3491 format for each addressing mode supported by AS6805:
3493 #data immediate data
3496 *dir direct page addressing
3497 (see .setdp directive)
3500 ,x register indirect addressing
3503 offset,x register indirect addressing
3504 0 <= offset <= 255 --- byte mode
3505 256 <= offset <= 65535 --- word mode
3506 (an externally defined offset uses the
3509 ext extended addressing
3515 AS6805 ASSEMBLER PAGE D-2
3516 6805 INSTRUCTION SET
3519 The terms data, dir, offset, and ext may all be expressions.
3521 Note that not all addressing modes are valid with every in-
3522 struction, refer to the 6805 technical data for valid modes.
3525 D.2.1 Control Instructions
3536 D.2.2 Bit Manipulation Instructions
3538 brset #data,*dir,label
3539 brclr #data,*dir,label
3545 D.2.3 Branch Instructions
3551 bhcc label bhcs label
3558 AS6805 ASSEMBLER PAGE D-3
3559 6805 INSTRUCTION SET
3562 D.2.4 Read-Modify-Write Instructions
3598 D.2.5 Register\Memory Instructions
3609 AS6805 ASSEMBLER PAGE D-4
3610 6805 INSTRUCTION SET
3613 D.2.6 Jump and Jump to Subroutine Instructions
3638 E.1 68HC08 REGISTER SET
3640 The following is a list of the 68HC08 registers used by
3643 a - 8-bit accumulator
3644 x - index register <H:X>
3648 E.2 68HC08 INSTRUCTION SET
3651 The following tables list all 68HC08 mnemonics recognized by
3652 the AS68HC08 assembler. The designation [] refers to a required
3653 addressing mode argument. The following list specifies the
3654 format for each addressing mode supported by AS68HC08:
3656 #data immediate data
3659 *dir direct page addressing
3660 (see .setdp directive)
3663 ,x register indexed addressing
3666 offset,x register indexed addressing
3667 0 <= offset <= 255 --- byte mode
3668 256 <= offset <= 65535 --- word mode
3669 (an externally defined offset uses the
3672 ,x+ register indexed addressing
3673 zero offset with post increment
3676 AS68HC08 ASSEMBLER PAGE E-2
3677 68HC08 INSTRUCTION SET
3681 offset,x+ register indexed addressing
3682 unsigned byte offset with post increment
3684 offset,s stack pointer indexed addressing
3685 0 <= offset <= 255 --- byte mode
3686 256 <= offset <= 65535 --- word mode
3687 (an externally defined offset uses the
3690 ext extended addressing
3694 The terms data, dir, offset, and ext may all be expressions.
3696 Note that not all addressing modes are valid with every in-
3697 struction, refer to the 68HC08 technical data for valid modes.
3700 E.2.1 Control Instructions
3711 E.2.2 Bit Manipulation Instructions
3713 brset #data,*dir,label
3714 brclr #data,*dir,label
3720 AS68HC08 ASSEMBLER PAGE E-3
3721 68HC08 INSTRUCTION SET
3724 E.2.3 Branch Instructions
3730 bhcc label bhcs label
3739 E.2.4 Complex Branch Instructions
3749 AS68HC08 ASSEMBLER PAGE E-4
3750 68HC08 INSTRUCTION SET
3753 E.2.5 Read-Modify-Write Instructions
3796 AS68HC08 ASSEMBLER PAGE E-5
3797 68HC08 INSTRUCTION SET
3800 E.2.6 Register\Memory Instructions
3811 E.2.7 Double Operand Move Instruction
3816 E.2.8 16-Bit <H:X> Index Register Instructions
3823 E.2.9 Jump and Jump to Subroutine Instructions
3848 F.1 6809 REGISTER SET
3850 The following is a list of the 6809 registers used by AS6809:
3852 a,b - 8-bit accumulators
3853 d - 16-bit accumulator <a:b>
3854 x,y - index registers
3855 s,u - stack pointers
3856 pc - program counter
3861 F.2 6809 INSTRUCTION SET
3864 The following tables list all 6809 mnemonics recognized by
3865 the AS6809 assembler. The designation [] refers to a required
3866 addressing mode argument. The following list specifies the
3867 format for each addressing mode supported by AS6809:
3869 #data immediate data
3872 *dir direct page addressing
3873 (see .setdp directive)
3879 cc,a,b,d,dp,x,y,s,u,pc
3881 ,-x ,--x register indexed
3886 AS6809 ASSEMBLER PAGE F-2
3887 6809 INSTRUCTION SET
3890 ,x+ ,x++ register indexed
3893 ,x register indexed addressing
3896 offset,x register indexed addressing
3897 -16 <= offset <= 15 --- 5-bit
3898 -128 <= offset <= -17 --- 8-bit
3899 16 <= offset <= 127 --- 8-bit
3900 -32768 <= offset <= -129 --- 16-bit
3901 128 <= offset <= 32767 --- 16-bit
3902 (external definition of offset
3905 a,x accumulator offset indexed addressing
3907 ext extended addressing
3909 ext,pc pc addressing ( pc <- pc + ext )
3911 ext,pcr pc relative addressing
3913 [,--x] register indexed indirect
3916 [,x++] register indexed indirect
3919 [,x] register indexed indirect addressing
3922 [offset,x] register indexed indirect addressing
3923 -128 <= offset <= 127 --- 8-bit
3924 -32768 <= offset <= -129 --- 16-bit
3925 128 <= offset <= 32767 --- 16-bit
3926 (external definition of offset
3929 [a,x] accumulator offset indexed
3932 [ext] extended indirect addressing
3934 [ext,pc] pc indirect addressing
3935 ( [pc <- pc + ext] )
3937 [ext,pcr] pc relative indirect addressing
3939 The terms data, dir, label, offset, and ext may all be expres-
3944 AS6809 ASSEMBLER PAGE F-3
3945 6809 INSTRUCTION SET
3948 Note that not all addressing modes are valid with every in-
3949 struction, refer to the 6809 technical data for valid modes.
3952 F.2.1 Inherent Instructions
3962 F.2.2 Short Branch Instructions
3967 bhis label bhs label
3969 blos label bls label
3977 F.2.3 Long Branch Instructions
3979 lbcc label lbcs label
3980 lbeq label lbge label
3981 lbgt label lbhi label
3982 lbhis label lbhs label
3983 lble label lblo label
3984 lblos label lbls label
3985 lblt label lbmi label
3986 lbne label lbpl label
3987 lbra label lbrn label
3988 lbvc label lbvs label
3992 AS6809 ASSEMBLER PAGE F-4
3993 6809 INSTRUCTION SET
3996 F.2.4 Single Operand Instructions
4035 AS6809 ASSEMBLER PAGE F-5
4036 6809 INSTRUCTION SET
4039 F.2.5 Double Operand Instructions
4064 F.2.6 D-register Instructions
4071 F.2.7 Index/Stack Register Instructions
4089 AS6809 ASSEMBLER PAGE F-6
4090 6809 INSTRUCTION SET
4093 F.2.8 Jump and Jump to Subroutine Instructions
4098 F.2.9 Register - Register Instructions
4103 F.2.10 Condition Code Register Instructions
4105 andcc #data orcc #data
4109 F.2.11 6800 Compatibility Instructions
4149 G.1 6811 REGISTER SET
4151 The following is a list of the 6811 registers used by AS6811:
4153 a,b - 8-bit accumulators
4154 d - 16-bit accumulator <a:b>
4155 x,y - index registers
4158 G.2 6811 INSTRUCTION SET
4161 The following tables list all 6811 mnemonics recognized by
4162 the AS6811 assembler. The designation [] refers to a required
4163 addressing mode argument. The following list specifies the
4164 format for each addressing mode supported by AS6811:
4166 #data immediate data
4169 *dir direct page addressing
4170 (see .setdp directive)
4173 ,x register indirect addressing
4176 offset,x register indirect addressing
4179 ext extended addressing
4183 The terms data, dir, offset, and ext may all be expressions.
4187 AS6811 ASSEMBLER PAGE G-2
4188 6811 INSTRUCTION SET
4191 Note that not all addressing modes are valid with every in-
4192 struction, refer to the 6811 technical data for valid modes.
4195 G.2.1 Inherent Instructions
4227 G.2.2 Branch Instructions
4241 AS6811 ASSEMBLER PAGE G-3
4242 6811 INSTRUCTION SET
4245 G.2.3 Single Operand Instructions
4296 AS6811 ASSEMBLER PAGE G-4
4297 6811 INSTRUCTION SET
4300 G.2.4 Double Operand Instructions
4305 adda [] addb [] addd []
4306 add a [] add b [] add d []
4332 suba [] subb [] subd []
4333 sub a [] sub b [] sub d []
4336 G.2.5 Bit Manupulation Instructions
4341 brclr [],#data,label
4342 brset [],#data,label
4347 AS6811 ASSEMBLER PAGE G-5
4348 6811 INSTRUCTION SET
4351 G.2.6 Jump and Jump to Subroutine Instructions
4356 G.2.7 Long Register Instructions
4387 H.1 6816 REGISTER SET
4389 The following is a list of the 6816 registers used by AS6816:
4391 a,b - 8-bit accumulators
4392 d - 16-bit accumulator <a:b>
4393 e - 16-bit accumulator
4394 x,y,z - index registers
4395 k - address extension register
4397 ccr - condition code
4400 H.2 6816 INSTRUCTION SET
4403 The following tables list all 6816 mnemonics recognized by
4404 the AS6816 assembler. The designation [] refers to a required
4405 addressing mode argument. The following list specifies the
4406 format for each addressing mode supported by AS6816:
4408 #data immediate data
4411 #xo,#yo local immediate data (mac / rmac)
4418 ,x zero offset register indexed addressing
4422 offset,x register indexed addressing
4425 AS6816 ASSEMBLER PAGE H-2
4426 6816 INSTRUCTION SET
4429 0 <= offset <= 255 --- 8-bit
4430 -32768 <= offset <= -1 --- 16-bit
4431 256 <= offset <= 32767 --- 16-bit
4432 (external definition of offset
4435 offset,x8 unsigned 8-bit offset indexed addressing
4436 offset,x16 signed 16-bit offset indexed addressing
4438 e,x accumulator offset indexed addressing
4440 ext extended addressing
4442 bank 64K bank number (jmp / jsr)
4444 The terms data, label, offset, bank, and ext may all be expres-
4447 Note that not all addressing modes are valid with every in-
4448 struction, refer to the 6816 technical data for valid modes.
4451 H.2.1 Inherent Instructions
4457 ediv edivs emul emuls
4458 fdiv fmuls idiv ldhi
4460 pshb pshmac pula pulb
4477 AS6816 ASSEMBLER PAGE H-3
4478 6816 INSTRUCTION SET
4481 H.2.2 Push/Pull Multiple Register Instructions
4483 pshm r,... pulm r,...
4486 H.2.3 Short Branch Instructions
4491 bhis label bhs label
4493 blos label bls label
4501 H.2.4 Long Branch Instructions
4503 lbcc label lbcs label
4504 lbeq label lbge label
4505 lbgt label lbhi label
4506 lbhis label lbhs label
4507 lble label lblo label
4508 lblos label lbls label
4509 lblt label lbmi label
4510 lbne label lbpl label
4511 lbra label lbrn label
4512 lbvc label lbvs label
4516 H.2.5 Bit Manipulation Instructions
4521 brclr [],#data,label
4522 brset [],#data,label
4525 AS6816 ASSEMBLER PAGE H-4
4526 6816 INSTRUCTION SET
4529 H.2.6 Single Operand Instructions
4582 AS6816 ASSEMBLER PAGE H-5
4583 6816 INSTRUCTION SET
4586 H.2.7 Double Operand Instructions
4621 H.2.8 Index/Stack Register Instructions
4633 AS6816 ASSEMBLER PAGE H-6
4634 6816 INSTRUCTION SET
4637 H.2.9 Jump and Jump to Subroutine Instructions
4639 jmp bank,[] jsr bank,[]
4642 H.2.10 Condition Code Register Instructions
4644 andp #data orp #data
4647 H.2.11 Multiply and Accumulate Instructions
4649 mac #data rmac #data
4650 mac #xo,#yo rmac #xo,#yo
4673 I.1 H8/3XX REGISTER SET
4675 The following is a list of the H8 registers used by ASH8:
4677 r0 - r7,sp 16-bit accumulators
4678 r0L - r7L,spL 8-bit accumulators
4679 r0H - r7H,spH 8-bit accumulators
4680 spL,spH,sp stack pointers
4684 I.2 H8/3XX INSTRUCTION SET
4687 The following tables list all H8/3xx mnemonics recognized by
4688 the ASH8 assembler. The designation [] refers to a required ad-
4689 dressing mode argument. The following list specifies the format
4690 for each addressing mode supported by ASH8:
4692 #xx:3 immediate data (3 bit)
4693 #xx:8 immediate data (8 bit)
4694 #xx:16 immediate data (16 bit)
4696 *dir direct page addressing
4697 (see .setdp directive)
4703 rn registers (16 bit)
4706 rnB registers (8 bit)
4707 r0H-r7H,r0L-r7L,spH,spL
4711 ASH8 ASSEMBLER PAGE I-2
4712 H8/3XX INSTRUCTION SET
4715 ccr condition code register
4717 @rn register indirect
4719 @-rn register indirect (auto pre-decrement)
4721 @rn+ register indirect (auto post-increment)
4723 @[offset,rn] register indirect, 16-bit displacement
4725 @@offset memory indirect, (8-bit address)
4727 ext extended addressing (16-bit)
4729 The terms data, dir, label, offset, and ext may all be expres-
4732 Note that not all addressing modes are valid with every in-
4733 struction, refer to the H8/3xx technical data for valid modes.
4736 I.2.1 Inherent Instructions
4745 I.2.2 Branch Instructions
4750 bhi label bhis label
4752 blo label blos label
4761 ASH8 ASSEMBLER PAGE I-3
4762 H8/3XX INSTRUCTION SET
4765 I.2.3 Single Operand Instructions
4794 rotxl.b rnB rotxr.b rnB
4796 rotl.b rnB rotr.b rnB
4798 shal.b rnB shar.b rnB
4800 shll.b rnB shlr.b rnB
4805 ASH8 ASSEMBLER PAGE I-4
4806 H8/3XX INSTRUCTION SET
4809 I.2.4 Double Operand Instructions
4813 add rnB,rnB add #xx:8,rnB
4816 cmp rnB,rnB cmp #xx:8,rnB
4822 addx rnB,rnB addx #xx:8,rnB
4824 and rnB,rnB and #xx:8,rnB
4827 or rnB,rnB or #xx:8,rnB
4830 subx rnB,rnB subx #xx:8,rnB
4832 xor rnB,rnB xor #xx:8,rnB
4838 add.b rnB,rnB add.b #xx:8,rnB
4841 cmp.b rnB,rnB cmp.b #xx:8,rnB
4847 addx.b rnB,rnB addx.b #xx:8,rnB
4849 and.b rnB,rnB and.b #xx:8,rnB
4852 or.b rnB,rnB or.b #xx:8,rnB
4855 subx.b rnB,rnB subx.b #xx:8,rnB
4857 xor.b rnB,rnB xor.b #xx:8,rnB
4861 ASH8 ASSEMBLER PAGE I-5
4862 H8/3XX INSTRUCTION SET
4865 I.2.5 Mov Instructions
4869 mov rnB,rnB mov rn,rn
4870 mov #xx:8,rnB mov #xx:16,rn
4871 mov @rn,rnB mov @rn,rn
4872 mov @[offset,rn],rnB mov @[offset,rn],rn
4873 mov @rn+,rnB mov @rn+,rn
4878 mov @label,rnB mov @label,rn
4879 mov label,rnB mov label,rn
4880 mov rnB,@rn mov rn,@rn
4881 mov rnB,@[offset,rn] mov rn,@[offset,rn]
4882 mov rnB,@-rn mov rn,@-rn
4887 mov rnB,@label mov rn,@label
4888 mov rnB,label mov rn,label
4893 mov.b rnB,rnB mov.w rn,rn
4894 mov.b #xx:8,rnB mov.w #xx:16,rn
4895 mov.b @rn,rnB mov.w @rn,rn
4896 mov.b @[offset,rn],rnB mov.w @[offset,rn],rn
4897 mov.b @rn+,rnB mov.w @rn+,rn
4902 mov.b @label,rnB mov.w @label,rn
4903 mov.b label,rnB mov.w label,rn
4904 mov.b rnB,@rn mov.w rn,@rn
4905 mov.b rnB,@[offset,rn] mov.w rn,@[offset,rn]
4906 mov.b rnB,@-rn mov.w rn,@-rn
4911 mov.b rnB,@label mov.w rn,@label
4912 mov.b rnB,label mov.w rn,label
4915 ASH8 ASSEMBLER PAGE I-6
4916 H8/3XX INSTRUCTION SET
4919 I.2.6 Bit Manipulation Instructions
4921 bld #xx:3,rnB bld #xx:3,@rn
4922 bld #xx:3,@dir bld #xx:3,dir
4923 bld #xx:3,*@dir bld #xx:3,*dir
4925 bild #xx:3,rnB bild #xx:3,@rn
4926 bild #xx:3,@dir bild #xx:3,dir
4927 bild #xx:3,*@dir bild #xx:3,*dir
4929 bst #xx:3,rnB bst #xx:3,@rn
4930 bst #xx:3,@dir bst #xx:3,dir
4931 bst #xx:3,*@dir bst #xx:3,*dir
4933 bist #xx:3,rnB bist #xx:3,@rn
4934 bist #xx:3,@dir bist #xx:3,dir
4935 bist #xx:3,*@dir bist #xx:3,*dir
4937 band #xx:3,rnB band #xx:3,@rn
4938 band #xx:3,@dir band #xx:3,dir
4939 band #xx:3,*@dir band #xx:3,*dir
4941 biand #xx:3,rnB biand #xx:3,@rn
4942 biand #xx:3,@dir biand #xx:3,dir
4943 biand #xx:3,*@dir biand #xx:3,*dir
4945 bor #xx:3,rnB bor #xx:3,@rn
4946 bor #xx:3,@dir bor #xx:3,dir
4947 bor #xx:3,*@dir bor #xx:3,*dir
4949 bior #xx:3,rnB bior #xx:3,@rn
4950 bior #xx:3,@dir bior #xx:3,dir
4951 bior #xx:3,*@dir bior #xx:3,*dir
4953 bxor #xx:3,rnB bxor #xx:3,@rn
4954 bxor #xx:3,@dir bxor #xx:3,dir
4955 bxor #xx:3,*@dir bxor #xx:3,*dir
4957 bixor #xx:3,rnB bixor #xx:3,@rn
4958 bixor #xx:3,@dir bixor #xx:3,dir
4959 bixor #xx:3,*@dir bixor #xx:3,*dir
4962 ASH8 ASSEMBLER PAGE I-7
4963 H8/3XX INSTRUCTION SET
4966 I.2.7 Extended Bit Manipulation Instructions
4968 bset #xx:3,rnB bset #xx:3,@rn
4969 bset #xx:3,@dir bset #xx:3,dir
4970 bset #xx:3,*@dir bset #xx:3,*dir
4971 bset rnB,rnB bset rnB,@rn
4972 bset rnB,@dir bset rnB,dir
4973 bset rnB,*@dir bset rnB,*dir
4975 bclr #xx:3,rnB bclr #xx:3,@rn
4976 bclr #xx:3,@dir bclr #xx:3,dir
4977 bclr #xx:3,*@dir bclr #xx:3,*dir
4978 bclr rnB,rnB bclr rnB,@rn
4979 bclr rnB,@dir bclr rnB,dir
4980 bclr rnB,*@dir bclr rnB,*dir
4982 bnot #xx:3,rnB bnot #xx:3,@rn
4983 bnot #xx:3,@dir bnot #xx:3,dir
4984 bnot #xx:3,*@dir bnot #xx:3,*dir
4985 bnot rnB,rnB bnot rnB,@rn
4986 bnot rnB,@dir bnot rnB,dir
4987 bnot rnB,*@dir bnot rnB,*dir
4989 btst #xx:3,rnB btst #xx:3,@rn
4990 btst #xx:3,@dir btst #xx:3,dir
4991 btst #xx:3,*@dir btst #xx:3,*dir
4992 btst rnB,rnB btst rnB,@rn
4993 btst rnB,@dir btst rnB,dir
4994 btst rnB,*@dir btst rnB,*dir
4997 I.2.8 Condition Code Instructions
4999 andc #xx:8,ccr andc #xx:8
5000 and #xx:8,ccr and.b #xx:8,ccr
5002 ldc #xx:8,ccr ldc #xx:8
5005 orc #xx:8,ccr orc #xx:8
5006 or #xx:8,ccr or.b #xx:8,ccr
5008 xorc #xx:8,ccr xorc #xx:8
5009 xor #xx:8,ccr xor.b #xx:8,ccr
5014 ASH8 ASSEMBLER PAGE I-8
5015 H8/3XX INSTRUCTION SET
5018 I.2.9 Other Instructions
5020 divxu rnB,rn divxu.b rnB,rn
5022 mulxu rnB,rn mulxu.b rnB,rn
5024 movfpe @label,rnB movfpe label,rnB
5025 movfpe.b @label,rnB movfpe.b label,rnB
5027 movtpe @label,rnB movtpe label,rnB
5028 movtpe.b @label,rnB movtpe.b label,rnB
5031 I.2.10 Jump and Jump to Subroutine Instructions
5034 jmp @label jmp label
5037 jsr @label jsr label
5060 J.1 8085 REGISTER SET
5062 The following is a list of the 8080/8085 registers used by
5065 a,b,c,d,e,h,l - 8-bit accumulators
5066 m - memory through (hl)
5071 J.2 8085 INSTRUCTION SET
5074 The following tables list all 8080/8085 mnemonics recognized
5075 by the AS8085 assembler. The following list specifies the
5076 format for each addressing mode supported by AS8085:
5078 #data immediate data
5081 r,r1,r2 register or register pair
5085 m memory address using (hl)
5087 addr direct memory addressing
5089 label call or jump label
5091 The terms data, m, addr, and label may be expressions.
5093 Note that not all addressing modes are valid with every in-
5094 struction, refer to the 8080/8085 technical data for valid
5098 AS8085 ASSEMBLER PAGE J-2
5099 8085 INSTRUCTION SET
5102 J.2.1 Inherent Instructions
5116 J.2.2 Register/Memory/Immediate Instructions
5118 adc r adc m aci #data
5119 add r add m adi #data
5120 ana r ana m ani #data
5121 cmp r cmp m cpi #data
5122 ora r ora m ori #data
5123 sbb r sbb m sbi #data
5124 sub r sub m sui #data
5125 xra r xra m xri #data
5128 J.2.3 Call and Return Instructions
5141 J.2.4 Jump Instructions
5154 AS8085 ASSEMBLER PAGE J-3
5155 8085 INSTRUCTION SET
5158 J.2.5 Input/Output/Reset Instructions
5165 J.2.6 Move Instructions
5175 J.2.7 Other Instructions
5217 The .hd64 directive enables processing of the HD64180 specific
5218 mnemonics not included in the Z80 instruction set. HD64180
5219 mnemonics encountered without the .hd64 directive will be
5220 flagged with an 'o' error.
5223 K.2 Z80 REGISTER SET AND CONDITIONS
5226 The following is a complete list of register designations and
5227 condition mnemonics:
5229 byte registers - a,b,c,d,e,h,l,i,r
5230 register pairs - af,af',bc,de,hl
5231 word registers - pc,sp,ix,iy
5235 NC - carry bit clear
5245 ASZ80 ASSEMBLER PAGE K-2
5249 K.3 Z80 INSTRUCTION SET
5252 The following tables list all Z80/HD64180 mnemonics recog-
5253 nized by the ASZ80 assembler. The designation [] refers to a
5254 required addressing mode argument. The following list specifies
5255 the format for each addressing mode supported by ASZ80:
5257 #data immediate data
5268 (hl) implied addressing or
5269 register indirect addressing
5271 (label) direct addressing
5273 offset(ix) indexed addressing with
5276 label call/jmp/jr label
5278 The terms data, dir, offset, and ext may all be expressions.
5279 The terms dir and offset are not allowed to be external refer-
5282 Note that not all addressing modes are valid with every in-
5283 struction, refer to the Z80/HD64180 technical data for valid
5287 ASZ80 ASSEMBLER PAGE K-3
5291 K.3.1 Inherent Instructions
5306 K.3.2 Implicit Operand Instructions
5327 ASZ80 ASSEMBLER PAGE K-4
5331 K.3.3 Load Instruction
5336 ld (label),a ld a,(label)
5337 ld (label),rp ld rp,(label)
5341 ld sp,iy ld rp,#data
5347 K.3.4 Call/Return Instructions
5351 call NC,label ret NC
5352 call NZ,label ret NZ
5354 call PE,label ret PE
5355 call PO,label ret PO
5360 K.3.5 Jump and Jump to Subroutine Instructions
5362 jp C,label jp M,label
5363 jp NC,label jp NZ,label
5364 jp P,label jp PE,label
5365 jp PO,label jp Z,label
5372 jr C,label jr NC,label
5373 jr NZ,label jr Z,label
5377 ASZ80 ASSEMBLER PAGE K-5
5381 K.3.6 Bit Manipulation Instructions
5388 K.3.7 Interrupt Mode and Reset Instructions
5396 K.3.8 Input and Output Instructions
5402 out (n),a out (c),rg
5407 K.3.9 Register Pair Instructions
5414 ex (sp),hl ex (sp),ix
5422 ASZ80 ASSEMBLER PAGE K-6
5426 K.3.10 HD64180 Specific Instructions
5466 Thanks to Marko Makela for his contribution of the AS6500
5473 Internet: Marko.Makela@Helsinki.Fi
5474 EARN/BitNet: msmakela@finuh
5476 Several additions and modifications were made to his code to
5477 support the following families of 6500 processors:
5479 (1) 650X and 651X processor family
5480 (2) 65F11 and 65F12 processor family
5481 (3) 65C00/21 and 65C29 processor family
5482 (4) 65C02, 65C102, and 65C112 processor family
5484 The instruction syntax of this cross assembler contains two
5485 peculiarities: (1) the addressing indirection is denoted by the
5486 square brackets [] and (2) the `bbrx' and `bbsx' instructions
5487 are written `bbr0 memory,label'.
5492 AS6500 ASSEMBLER PAGE L-2
5496 L.2 6500 REGISTER SET
5498 The following is a list of the 6500 registers used by AS6500:
5500 a - 8-bit accumulator
5501 x,y - index registers
5504 L.3 6500 INSTRUCTION SET
5507 The following tables list all 6500 family mnemonics recog-
5508 nized by the AS6500 assembler. The designation [] refers to a
5509 required addressing mode argument. The following list specifies
5510 the format for each addressing mode supported by AS6500:
5512 #data immediate data
5515 *dir direct page addressing
5516 (see .setdp directive)
5519 offset,x indexed addressing
5520 offset,y indexed addressing
5521 address = (offset + (x or y))
5523 [offset,x] pre-indexed indirect addressing
5525 address = contents of location
5526 (offset + (x or y)) mod 256
5528 [offset],y post-indexed indirect addressing
5529 address = contents of location at offset
5530 plus the value of the y register
5532 [address] indirect addressing
5534 ext extended addressing
5538 address,label direct page memory location
5540 bbrx and bbsx instruction addressing
5542 The terms data, dir, offset, address, ext, and label may all be
5545 Note that not all addressing modes are valid with every in-
5546 struction, refer to the 65xx technical data for valid modes.
5549 AS6500 ASSEMBLER PAGE L-3
5550 6500 INSTRUCTION SET
5553 L.3.1 Processor Specific Directives
5556 The AS6500 cross assembler has four (4) processor specific
5557 assembler directives which define the target 65xx processor
5560 .r6500 Core 650X and 651X family (default)
5561 .r65f11 Core plus 65F11 and 65F12
5562 .r65c00 Core plus 65C00/21 and 65C29
5563 .r65c02 Core plus 65C02, 65C102, and 65C112
5566 L.3.2 65xx Core Inherent Instructions
5583 L.3.3 65xx Core Branch Instructions
5592 L.3.4 65xx Core Single Operand Instructions
5602 AS6500 ASSEMBLER PAGE L-4
5603 6500 INSTRUCTION SET
5606 L.3.5 65xx Core Double Operand Instructions
5619 L.3.6 65xx Core Jump and Jump to Subroutine Instructions
5624 L.3.7 65xx Core Miscellaneous X and Y Register Instructions
5634 AS6500 ASSEMBLER PAGE L-5
5635 6500 INSTRUCTION SET
5638 L.3.8 65F11 and 65F12 Specific Instructions
5640 bbr0 [],label bbr1 [],label
5641 bbr2 [],label bbr3 [],label
5642 bbr4 [],label bbr5 [],label
5643 bbr6 [],label bbr7 [],label
5645 bbs0 [],label bbs1 [],label
5646 bbs2 [],label bbs3 [],label
5647 bbs4 [],label bbs5 [],label
5648 bbs6 [],label bbs7 [],label
5661 L.3.9 65C00/21 and 65C29 Specific Instructions
5663 bbr0 [],label bbr1 [],label
5664 bbr2 [],label bbr3 [],label
5665 bbr4 [],label bbr5 [],label
5666 bbr6 [],label bbr7 [],label
5668 bbs0 [],label bbs1 [],label
5669 bbs2 [],label bbs3 [],label
5670 bbs4 [],label bbs5 [],label
5671 bbs6 [],label bbs7 [],label
5689 AS6500 ASSEMBLER PAGE L-6
5690 6500 INSTRUCTION SET
5693 L.3.10 65C02, 65C102, and 65C112 Specific Instructions
5695 bbr0 [],label bbr1 [],label
5696 bbr2 [],label bbr3 [],label
5697 bbr4 [],label bbr5 [],label
5698 bbr6 [],label bbr7 [],label
5700 bbs0 [],label bbs1 [],label
5701 bbs2 [],label bbs3 [],label
5702 bbs4 [],label bbs5 [],label
5703 bbs6 [],label bbs7 [],label
5724 Additional addressing modes for the following core instruc-
5725 tions are also available with the 65C02, 65C102, and 65C112 pro-
projects / fw / sdcc / blob