GLASS ASSEMBLER. Laurens Holst
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1 GLASS ASSEMBLER Laurens Holst
2 Table of Contents Project information Glass Z80 Assembler Syntax Lines are composed as follows: Labels Instructions Z80 instructions: Directives Macro s Literals Operators Operator precedence:
3 Preface Editor Pete Willard Lettering This book was set in Ubuntu TrueType Text Layout Ruby Gem - ASCIIDOCTOR-PDF Glass Assembler Copyright 2013, Laurens Holst 1
4 GLASS Assembler Project information Glass is a cross-platform assembler for the Z80 processor, written in Java 8. Site: License: Simplified BSD License Glass is BSD licensed, which means that you are free to use the software and source code in any way you wish as long as attribution is given to the original project and its author(s). For details, please consult the LICENSE file. To submit contributions, please contact the author. 2
5 Glass Z80 Assembler Glass Z80 Assembler Syntax The assembler syntax follows common style. Lines are composed as follows: label: mnemonic arguments ;comment Note that the white space before the mnemonic is significant; otherwise, it will be interpreted as a label. All identifiers are case-sensitive. Mnemonics of built-in instructions, directives, registers, flags and annotations are recognized in lowercase and uppercase. They can not be mixed case. Labels Labels and other identifiers follow the following grammar: identifier = id_start_char id_char* id_start_char = [a-z] [A-Z] id_char = id_start_char [0-9] ' $ The colon after a label is optional. If a label has no colon, it can not have any leading white space, it must start at column 0. Instructions Standard z80 instruction syntax is used: ld a,(ix + 10) Parentheses are used to indicate indirection. Z80 instructions: adc add and bit call ccf cp cpd cpdr cpi cpir cpl daa dec di djnz ei ex exx halt im in inc ind indr ini inir jp jr ld ldd lddr ldi ldir neg nop or otdr otir out outd outi pop push res ret reti retn rl rla rlc rlca rld rr rra rrc rrca rrd rst sbc For a complete description of the Z80 instruction set, see the official Zilog documentation: z80/um0080.pdf In addition to the documented Z80 instructions, the variations using the undocumented ixh, ixl, iyh and iyl index registers are supported, as well as the semi-documented in (c). 3
6 GLASS Assembler For register jumps jp (hl) etc., the parentheses are optional. R800 instructions mulub, muluw - R800 multiplication instructions (MSX TURBO). Define byte db -Defines a byte or a sequence of bytes. Define word dw -Defines a word or a sequence of words. Define double word dd - Defines a double word or a sequence of double words. Define space ds - Defines space for a number of bytes. The first argument indicates the number of bytes, the optional second argument specifies the fill value (default 0). The first argument can be annotated with virtual, in which case the address counter will be incremented accordingly, but no object is actually generated in the output. If the virtual annotation is given, you can not specify a fill value. Directives Origin org - Changes the address location counter and sets a new origin for subsequent statements. org 0100H Assign constant equ - Assigns a constant value to a symbol. JIFFY: equ 0FC9EH Include include - Includes another source file. The current working directory is searched, as well as any include paths specified on the command line. INCLUDE "math.asm" INCLUDE ONCE "math.asm" Optionally you can specify a once annotation to prevent a file from being included more than once. However it is not recommended to use unless needed. Include binary incbin - Includes binary data from a file. The current working directory is searched, as well as any include paths specified on the command line. INCBIN "image.ge5" Optionally you can specify a start position and length: INCBIN "image.ge5",7,212*128 Macro s Macro macro, endm - Defines a macro instruction, composed of all the instructions that follow until the endm directive is encountered. The definition s arguments specify the parameters which are passed when the macro is invoked. 4
7 Glass Z80 Assembler ALIGN:: MACRO?boundary ds?boundary ($ +?boundary - 1) %?boundary ENDM ALIGN 100H All symbols defined in a macro block are local. Symbols in macro instances can be referenced by using the. operator. Symbols in macro definitions can also be referenced; the contents are assembled on address 0, effectively turning the inner symbols into offsets. This is useful for specifying structures and indexing. Default values for macro arguments can be specified with =: ALIGN: MACRO?boundary = 100H Repetition rept, endm - Repeats a section of code a number of times. The end of the section is marked with the endm directive. The first argument is mandatory and specifies the number of repeats. The second argument specifies a counter parameter, the third the initial value for the counter (default: 0), and the fourth argument specifies the counter increment (default: 1). REPT 10,?counter, 0, 2 ld bc,(table +?counter) REPT 3 add hl,bc ENDM ENDM All symbols defined in a repeat block are local. If a repeat is labeled, the inner repeat scopes can be accessed by index, e.g.: mylist.0. Indefinite repetition irp, endm - Repeats a section of code for each of the arguments specified. The end of the section is marked with the endm directive. The first argument is mandatory and specifies the parameter the current repetition s value is passed to. The remaining arguments are passed one by one as the section is repeated. IRP?value, 1, 2, 4, 8, 16, 32, 64, 128 or?value ENDM All symbols defined in a indefinite repeat block are local. If a repeat is labeled, the inner repeat scopes can be accessed by index, e.g.: mylist.0. Procedure proc, endp - Defines a section of code as a procedure. Currently mostly serves to establish a local scope. shift5: PROC ld b,5 jp shiftl.loop ENDP shiftl: PROC ld b,1 loop: add a,a djnz loop ret ENDP 5
8 All symbols defined in a procedure block are local. Symbols in inner scopes can be referenced by using the. operator. Condition GLASS Assembler if, else, endif - Conditionally assembles a section of code, or an optional alternative section. The end of the section is either marked with endif, or with else in which case an alternative will follow up to the endif. The argument is evaluated as an integer, and if the result is nonzero (true) the first section is assembled, and if the result is zero (false) the alternative is assembled if one is provided. PAD: MACRO?address IF $ >?address ERROR "Padding address exceeded." ELSE ds?address - $ ENDIF ENDM Error error - Generates an error and aborts the compilation. Optionally a message can be specified. ERROR "Limit exceeded." Warning warning - Generates a warning. Optionally a message can be specified. WARNING "Nearly out of space." Section section - Defines a section of code or data that will be assembled inside the space of a ds statement. This allows you to have nonadjacent code or data sections and group them into separate regions, such as ROM and RAM pages. The mandatory argument references the DS statement that is the target of the section. org 4000H ROM_PAGE1: ds 4000H ROM_PAGE2: ds 4000H RAM: ds VIRTUAL 3000H SECTION ROM_PAGE1 SetValue: ld (value),a ret SECTION RAM value: db 0 ENDS ENDS Literals Decimal: 127 Hexadecimal: 0FC9EH, #FC9E, $FC9E or 0xFC9E Binary: B or % Octal: 377O Character: 'c' String: "abc" Strings support the following escape sequences: 6
9 Glass Z80 Assembler \0 (NUL) \a (bell) \t (tab) \n (line feed) \f (form feed) \r (carriage return) \e (escape) \" (double quotation mark) \' (single quotation mark) \\ (backslash) Numeric escape sequences are not supported. In stead, you can insert them using the comma operator: "abc", 0FFH, "def". The character set used to read files is ISO , this maps the file s bytes 1:1 to the Unicode code points used internally so the object code output matches the input file bytes verbatim. The assembler uses 32-bit integer math internally. When a 8-bit or 16-bit value is generated, the excessive bits are usually truncated. Except for addresses, used in jumps, calls and indirect loads, they generate an error. Index and relative jump offsets are also checked to be in their allowed range. Operators Member. Positive +a Negative -a Complement ~a Not!a Multiply Divide Modulo Add Subtract Shift left Shift right Less than Less or equal Greater than Greater or equal Equal Not equal Bitwise and Bitwise xor Bitwise or b a && b a * b a / b a % b a + b a - b a << b a >> b a < b a b a > b a >= b a = b a!= b a & b a ^ b a Logical and Logical or 7
10 GLASS Assembler a b a? b Annotation Sequence Ternary if c a b a, b Group () Index [] Logical operators use integers to represent true / false values. 0 means false, any other value means true. They return -1 for true values. Logical and / or apply short-circuit evaluation and evaluate to the last evaluated value, so they can also be used similar to a ternary operator. Expressions can span multiple lines when they are incomplete at the line ends. Operator precedence:. unary + - ~! * / % + - << >> < <= > >= =!= & ^ &&?:, 8
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