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PROGRAM:

NAME

z80dasm - Z80 assembly generating disassembler

SYNOPSIS

z80dasm [ options ] file

DESCRIPTION

z80dasm disassembles a binary file containing Z80 machine code into Z80 assembly language
source (including a number of undocumented opcodes). It can try to guess locations of
labels in the code or the labels can be specified by hand in the form of a symbol file. If
given proper information the disassembler can also split the binary file into code and
data sections of several different types.

Generated source file can be assembled back into the original binary using z80asm, zasm or
the original Zilog assembler (when the --zilog option was used).

OPTIONS

-a, --address
Print the address of the memory location corresponding to each line of assembly
code in a comment at the end of the line.

-b, --block-def=FILE
Read block information from a file. If this option is not specified the default is
for the entire file to contain machine code. See BLOCK FILE below.

-g, --origin=ORG
Specify the start address of the binary code being disassembled. A corresponding
org directive is generated in the output file. The argument is read in hexadecimal
if it begins with 0x or 0X, in octal if it begins with 0, and in base 10
otherwise. Default is 0x0100.

-h, --help
Show summary of options and exit.

-l, --labels
Try to guess label locations from jump instructions and add them to the assembly
code.

-o, --output=FILE
Specify the output file. Default is to write to standard output.

-s, --sym-output=FILE
Write symbol information into a file.

-S, --sym-input=FILE
Read symbol information from a file. See SYMBOL FILE below.

-t, --source
Print the binary data corresponding to each line of assembly code in a comment at
the end of the line. Data is printed in hex and ASCII. This is useful for
identifying data sections in the first disassembly.

-v, --verbose
Increase verbosity level. Specify multiple times to be more verbose. Messages are
sent to standard error.

-V, --version
Display version information and exit.

-z, --zilog
Enable compatibility mode for the original Zilog Z80 assembler. This currently only
changes the syntax of relative jumps.

SYMBOL FILE

Symbol files written by z80dasm can be directly used as input symbol files with the --sym-
input option. The following directives are recognized in input symbol files and are
propagated to the output symbol files:

include "filename"
Include another symbol file. Double quotes are mandatory. Included files must be in
the current directory.

symbol: equ value
Define a symbol with a value. The value is read in hexadecimal if it begins with 0x
or 0X, in octal if it begins with 0, and in base 10 otherwise. Default is 0x0100.

; comment
All characters between a semi-colon and end of line are ignored.

BLOCK FILE

Block files specify the boundaries between different blocks (sections) of binary data in
the disassembler input file. The following directives are recognized:

name: start address end address type type
Define a block with the start and end address that contains a certain type of
binary data. Start address is the 16 bit address of the first byte in the block.
End address is the 16 bit address of the last byte in the block plus one.

; comment
All characters between a semi-colon and end of line are ignored.

The following block types are supported:

code Block containing Z80 machine code. Data in this block will be written in Z80
assembly language.

bytedata
Data block containing separate bytes. Data in this block will be written with defb
directives.

worddata
Data block containing 16 bit words (low order byte first). Data in this block will
be written with defw directives.

pointers
Data block containing 16 bit pointers (low order byte first). This type is
equivalent to worddata except that values will be replaced with labels where that
is possible.

DIAGNOSTICS

If disassembly was successful z80dasm returns 0. On error diagnostic messages are printed
to standard error and z80dasm returns 1.

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