The NOP opcode for x86/x86_64 is 0x90, but which is the analog on the iPhone with the ARM instruction set?
MOV r0, r0 is traditionally used in ARM code, which has the opcode 0xe1a00000; MOV r8, r8 is used in THUMB code (opcode 0x46c0)
ARMv7 has an actual NOP instruction, with the following encodings:
0xbf00 2 byte thumb2 form
0xf3af8000 4 byte thumb2 form
0x*320f000 4 byte arm form
When targeting earlier versions of the architecture, assemblers translate NOP into the MOV instructions that moonshadow listed.
You shouldn t need to use the actual opcodes, as the development tools understand NOP.
I would like to add that non-conditional NOP for armv7 is 0xE320F000.
Note that if you are going to patch a file you will need to write bytes in reverse order (little endian) - 00 F0 20 E3
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