rasm2 is an inline assembler/disassembler. Initially, rasm tool was designed to be used for binary patching. It is main function is get bytes corresponding to given machine instruction opcode.

$ rasm2 -h
Usage: rasm2 [-CdDehLBvw] [-a arch] [-b bits] [-o addr] [-s syntax]
             [-f file] [-F fil:ter] [-i skip] [-l len] 'code'|hex|-
 -a [arch]    Set architecture to assemble/disassemble (see -L)
 -b [bits]    Set cpu register size (8, 16, 32, 64) (RASM2_BITS)
 -c [cpu]     Select specific CPU (depends on arch)
 -C           Output in C format
 -d, -D       Disassemble from hexpair bytes (-D show hexpairs)
 -e           Use big endian instead of little endian
 -f [file]    Read data from file
 -F [in:out]  Specify input and/or output filters (att2intel, x86.pseudo, ...)
 -h           Show this help
 -i [len]     ignore/skip N bytes of the input buffer
 -k [kernel]  Select operating system (linux, windows, darwin, ..)
 -l [len]     Input/Output length
 -L           List supported asm plugins
 -o [offset]  Set start address for code (default 0)
 -O [file]    Output file name (rasm2 -Bf a.asm -O a)
 -s [syntax]  Select syntax (intel, att)
 -B           Binary input/output (-l is mandatory for binary input)
 -v           Show version information
 -w           What's this instruction for? describe opcode
 If '-l' value is greater than output length, output is padded with nops
 If the last argument is '-' reads from stdin

Plugins for supported target architectures can be listed with the -L option. Knowing a plugin name, you can use it by specifying its name to the -a option

$ rasm2 -L
_d  16         8051        PD      8051 Intel CPU
_d  16 32      arc         GPL3    Argonaut RISC Core
ad  16 32 64   arm         GPL3    Acorn RISC Machine CPU
_d  16 32 64   arm.cs      BSD     Capstone ARM disassembler
_d  16 32      arm.winedbg LGPL2   WineDBG's ARM disassembler
_d  16 32      avr         GPL     AVR Atmel
ad  32         bf          LGPL3   Brainfuck
_d  16         cr16        LGPL3   cr16 disassembly plugin
_d  16         csr         PD      Cambridge Silicon Radio (CSR)
ad  32 64      dalvik      LGPL3   AndroidVM Dalvik
ad  16         dcpu16      PD      Mojang's DCPU-16
_d  32 64      ebc         LGPL3   EFI Bytecode
_d  8          gb          LGPL3   GameBoy(TM) (z80-like)
_d  16         h8300       LGPL3   H8/300 disassembly plugin
_d  8          i8080       BSD     Intel 8080 CPU
ad  32         java        Apache  Java bytecode
_d  32         m68k        BSD     Motorola 68000
_d  32         malbolge    LGPL3   Malbolge Ternary VM
ad  32 64      mips        GPL3    MIPS CPU
_d  16 32 64   mips.cs     BSD     Capstone MIPS disassembler
_d  16 32 64   msil        PD      .NET Microsoft Intermediate Language
_d  32         nios2       GPL3    NIOS II Embedded Processor
_d  32 64      ppc         GPL3    PowerPC
_d  32 64      ppc.cs      BSD     Capstone PowerPC disassembler
ad             rar         LGPL3   RAR VM
_d  32         sh          GPL3    SuperH-4 CPU
_d  32 64      sparc       GPL3    Scalable Processor Architecture
_d  32         tms320      LGPLv3  TMS320 DSP family
_d  32         ws          LGPL3   Whitespace esotheric VM
_d  16 32 64   x86         BSD     udis86 x86-16,32,64
_d  16 32 64   x86.cs      BSD     Capstone X86 disassembler
a_  32 64      x86.nz      LGPL3   x86 handmade assembler
ad  32         x86.olly    GPL2    OllyDBG X86 disassembler
ad  8          z80         NC-GPL2 Zilog Z80

Note that "ad" in the first column means both assembler and disassembler are offered by a corresponding plugin. "d" indicates disassembler, "a" means only assembler is available.

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