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Linux disassembler python 64 bits#
The register RAX is a 64-bit register, so it can contain any value which fits into 64 bits (8 bytes). The instruction mov RAX, a will copy the address of the variable a to the register. Whereas in assembly, you copy first to a register (we’ll use RAX) and then to the destination: mov RAX, a This means that when writing assembly instructions, you need to need to run many steps to accomplish something which would otherwise be done in 1 line in a higher-level language.įor example, to assign a variable a to the reference of variable b in Python: a = b You can also copy data from memory (RAM), but you can’t copy from RAM to RAM, it must go via a register. The CPU has many registers and it loads data from registers to execute the instructions. Over releases of a CPU architecture the manufacturers add new instructions to the set. There are also extension instructions on those CPU architectures. With the most common being x86, ARM, and x86-64. Different CPU architectures have different instruction sets.
Linux disassembler python code#
What ABI does CPython have between C that could make it more extensible by other languagesĪssembly code is a sequence of instructions, using an instruction set.If Python C extensions compile to shared libraries, whats the magic inside them that makes them loadable by Python?.Why do extensions in CPython need to be written in Python or C?.There are some questions I wanted answers to, like: Them to the high-level languages that I’m familiar with. I started learning x86-64 assembly from Jo Van Hooey’s book and understood some of the basic concepts but struggled to relate Why? Well, because after finishing the CPython Internals book, the assembly code was still something of a mystery. I wanted to see if I could write a CPython Extension in 100% assembly. Programmers are used to working on the guts of a system and manipulating the ugly-inner workings to get it to follow some simple instructions.
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The working machine on the outside obscures a network of patterns, patches, and workarounds in its internals. It’s a thrill, but its a whole different skill to put it back together. Kids who took a screwdriver to something, just to see whats inside it. I’m sure many of the people reading this article will have been one of those kids. On occasion, you need to take something apart and put it back together to fully understand it.