Ubuntu Manpage: z80dasm - Z80 assembly generating disassembler

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.

-r, --sym-order=SORT
Ordering of symbols in the symbol file. SORT can be default (sort by value) or frequency (sort by
usage frequency).

-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.

-u, --undoc
By default, all undocumented instructions are disassembled as defb directives with the instruction
name in a comment. This is due to missing or buggy support for many of these instructions in
z80asm. If this option is specified, undocumented instructions are written directly into the
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: [ unlabeled ] [ start | first ] address [ unlabeled ] [ end | last ] 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. Keywords "start"  and  "first"
              are  synonymous.  If  the keyword "end" is used, the end address is the 16 bit address of the last
              byte in the block plus one. If the keyword "last" is used, the end address is the 16  bit  address
              of the last byte in block.

              Normally  labels  are  defined  at  the  addresses  specified in the block definition. This can be
              suppressed by adding the keyword "unlabeled" before the address.

       ; 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.

BUGS

       Please report bugs to tomaz.solc@tablix.org

AUTHOR

       z80dasm is based largely on dz80 , written by Jan Panteltje. Feature enhancements and bug fixes were made
       by Tomaz Solc.