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Man Pages


Manual Reference Pages  -  X86DIS (1)

NAME

x86dis - disassemble a bytestream of Intel x86 instructions

CONTENTS

SYNTAX

x86dis [-a offset|--addr=offset]
[-r offset len|--range=offset len]
[-e offset|--entry=offset]
[-s name|--syntax=name]
[-d name|--desc=name]
[-f file|--file=file]
[-o file|--out=file]
[-l file|--log=file]
[-p num|--pagesize=num]
[-h|-?|--help]
[-v|--version]

DESCRIPTION

A command-line interface to the libdisasm disassembler library.

OPTIONS

At least one option from the list -a, -e, -r must be given.
-f, --file=file
  Read input bytes from file instead of stdin
-o, --out=file
  Write output to file instead of stdout
-l, --log=file
  Log errors to file instead of stderr
-p, --pagesize=num
  Set page size for buffering STDIN to num (default 512K)
-s, --syntax=name
  Set output syntax to name, where name is one of intel
(Intel syntax), att (AT&T syntax), raw (libdisasm syntax)
-d, --desc=name
  Print a description of syntax name
-a, --addr=offset
  Disassemble single instruction at offset
-e, --entry=offset
  Disassemble forward from offset
-r, --range=offset len
  Disassemble len bytes starting at offset
All offset and len parameters are expected to follow the conventions used in strtoul(3), where hexadecimal numbers have the prefix 0x, octal numbers have the prefix 0, and decimal numbers have no prefix. A value of 0 for len indicates that that range extends to the end of the file.

EXAMPLES

cat ‘which ls‘ | x86dis -s intel -e 0x00 -r 0x00 -1 -a 0xEEEE
x86dis -e 0 -s intel < bootsect.img
x86dis -d -s raw -f a.out -e ‘readelf -h a.out |
grep Entry | awk ’{ printf( "0x%%x",
strtonum($4) - 0x8048000 ) }‘ echo ’55 89 e5 83 EC 08’ | perl -ane ’foreach(@F){print pack("C",hex);}’| x86dis -e 0 -s att

NOTES

x86dis performs no file format parsing, nor any verification that its input is in fact executable binary code. All offsets are assumed to be from the start of the file, with no load addresses applied. The intent is to provide a bytestream disassembler rather than an object file disassembler.

Descriptions of the various output formats can be obtained using the -d option.

AUTHORS

mammon_ <mammon_@users.sourceforge.net>

SEE ALSO

bastard(1), libdisasm(7), x86_disasm(3), x86_format_insn(3), x86_init(3)

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mammon_ X86DIS (1) 0.21

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