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 Forums >>  Target Specific - General  >>  ARM Executable - Patching / Assemble

Topic created on: August 16, 2010 06:48 CDT by iktisatcihacker .

Hi,
I am new here and in reverse engineering. As you know we can add assembly code in Ollydbg. Just right click on a string and Assemble :)

Now I am dissassembling an ARM executable. As you know Ollydbg doesnt support ARM. I dissassembly it with IDA Pro. But in IDA , I can not add my assembly code into my ARM Executable. After "Edit>Patch Program>Assemble" , It gives an error. (Sorry, This processor module doesnt support the assembler).

So how can add my assembly code into this ARM executable?

Thanks...

  AMX   December 14, 2010 05:40.00 CST
I dont know of any program that does this as comfortable as Ollydbg seems to do it (I never used Ollydbg).
A technique I used for binary files was appending code to the file and inserting a branch instruction at the appropriate place. You can calculate a branch like:
uint32_t br = 0xea000000 | ((branch_dest - 8) >> 2);
If you have an elf or something else you would need to adjust some more values in the headers/tables.
For the code you append, just compile it and make it a binary using objcopy for example:
(arm-xxx-)objdump -S -O binary infile.elf outfile.bin
be sure to either compile with -fPIC or use an appropriate linker script

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