rz-asm1

Usage

Overview

This command is part of the Rizin project.

This tool uses RzAsm to assemble and disassemble files or hexpair strings. It supports a large list of architectures which can be listed using the -L flag.

-a arch

Set architecture to assemble/disassemble (see -L)

-A

Show analysis information from given hexpairs

-b bits

Set CPU register size (8, 16, 32, 64) (RZ_ASM_BITS)

-B

Binary input/output (-l is mandatory for binary input)

-c CPU

Select specific CPU (depends on the arch)

-C

Output in C format

-d, -D

Disassemble from hexpair bytes (-D show hexpairs)

-e

Use big endian instead of little endian

-I

Display lifted RzIL code (same input as in -d, IL is also validated)

-E

Display ESIL expression (same input as in -d)

-f file

Read data from file

-F in:out

Specify input and/or output filters (att2intel, x86.pseudo, ...)

-h, -hh

Show usage help message, hh for long

-i len

Ignore N bytes of the input buffer

-j

Output in JSON format

-k kernel

Select operating system (linux, windows, darwin, ..)

-l len

Input/Output length

-L

List asm plugins: (a=asm, d=disasm, A=analyze, e=ESIL)

-m plugin

List supported CPUs for the chosen plugin

-o, -@ addr

Set start address for code (default 0)

-O file

Output file name (rz-asm -Bf a.asm -O a)

-p

Run SPP over input for assembly

-q

Quiet mode

-r

Output in rizin commands

-s syntax

Select syntax (intel, att)

-v

Show version information

-x

Use hex dwords instead of hex pairs when assembling

-w

Describe opcode

Directives

.intel_syntax

Use Intel syntax rather than AT&T

.att_syntax

Use AT&T syntax rather than Intel

.align number

Set the code or data alignment

.arch name

Set the code architecture

.arm

Set the ARM mode (as opposed to Thumb) for ARM architecture

.ascii string

Define the ASCII string

.asciz string

Define the zero-ending ASCII string

.bits number

Define the code bitness

.big_endian

Set the BE (big endian) byte order

.cpu name

Set the CPU for the chosen architecture

.data

Mark the start of the data section

.endian 1|0

Set the endianness (the byte order) - 1 is BE, 0 is LE

.equ name value

Define the constant

.fill repeat,size,value

Fill the data with the repeating value pattern

.hex data

Define the data in hexadecimal format

.incbin filename

Include binary file

.int16 number

Define 16-bit integer

.int32 number

Define 32-bit integer

.int64 number

Define 64-bit integer

.kernel name

Set the kernel for syscalls

.little_endian

Set the LE (little endian) byte order

.org value

Set the value of the PC (Program Counter) register

.os name

Set the operating system for syscalls

.short number

Define 16-bit integer

.string string

Define the ASCII string

.text

Mark the start of the text section

.thumb

Set the Thumb mode (as opposed to ARM) for ARM architecture

Environment

RZ_ARCH: e asm.arch - architecture to assemble/disassemble (same as rz-asm -a)

RZ_ASM_ARCH: architecture to assemble/disassemble (same as rz-asm -a)

RZ_ASM_BITS: cpu register size (8, 16, 32, 64) (same as rz-asm -b)

RZ_BITS: e asm.bits - cpu register size (8, 16, 32, 64) (same as rz-asm -b)

RZ_DEBUG: if defined, show error messages and crash signal0

RZ_NOPLUGINS: do not load shared plugins (speedup loading)0

Examples

Assemble opcode:

rz-asm -a x86 -b 32 'mov eax, 33'

Disassemble opcode:

rz-asm -d 90