translate arm instructions to hex

Question

I looking for simple tool(not site) to translate arm instruction to hex like http://armconverter.com/.

Without linker , I want put 1 instruction , and want get the hex .

Do you know one please?

Answer 1

as i commented to Elians post rasm2 works in windows as is

rasm2 -a arm -b 32 "add r0, r1, r2" will return 020081e0

you can use keystone / capstone to assemble and disassemble

:\>python
>>> from keystone import *
>>> for i in (Ks(KS_ARCH_ARM,KS_MODE_ARM).asm ("add R0,R1,R2" , 0x400000) )[0]:
...     print "%02x " % i
...
02
00
81
e0
>>>

or if you have visual studio you can compile and dumpbin a single instruction

:\>cat foo.asm
    AREA .text, CODE, ARM
test PROC
    add R0,R1,R2
    ENDP
    END

:\>armasm /nologo foo.asm

:\>dumpbin /disasm foo.obj | grep add
  00000000: EB01 0002 add         r0,r1,r2

with keystone you use KS_MODE_THUMB with rasm you should be using -b 16 but it seems there is a bug where rasm2 can disassemble hex pairs correctly but not assemble it back again

so may be you follow it up in github issues for radare2

>>> from keystone import *
>>> for i in (Ks(KS_ARCH_ARM , KS_MODE_THUMB).asm("add r0,r1,r2" , 0 ))[0]:
...     print "%02x " %i ,
...
01  eb  02  00
>>> ^Z


C:\>rasm2 -a arm -b 16 -d "01 eb 02 00"
add.w r0, r1, r2

C:\>rasm2 -a arm -b 16 add.w r0, r1, r2
Cannot assemble 'add.w' at line 3
invalid

Answer 2

For this exact purpose I highly suggest using a command line tool such as rasm2.

It is a tool that comes with the radare2 suite. One of it's basic capabilities is translating assembly instructions in various architectures to opcodes and vice versa. The usage is fairly simple:

# rasm2 -a arm -b 32 "add R0, R1, R2"
020081e0

Here:

-a specifies the architecture.

-b specifies the bits (where 16 is Thumb-1)

For more information there is plenty, such as the radare2 blog and official book.