Mac assembly language4/7/2023 ![]() They're what are most commonly supported, and what you're probably going to be interfacing with if you're ![]() ![]() The most important part of the ABI is whatever the calling convention is for C-style functions. ![]() This part is generally not portable between OSes unless you use trampolines/thunks (basically another layer of abstraction that has to be rewritten for every OS you intend to support). Userspace is trickiest: you have to get the ABI right or your assembly program is all but useless. The trouble with assembly language comes when you interact with the outside world: the OS kernel, and other userspace code. Unless you're doing extremely low-level hackery (that is, OS development), the nuts and bolts of how the OS and CPU interact are almost totally irrelevant. AT&T syntax is just one giant headache.) Yes, finding the right flags to pass to the assembler and linker can be tricky, but you'll know when you've got it and you only have to do it once per OS (if you remember to write it down somewhere!).Īssembly instructions themselves, of course, are completely OS-agnostic. All the official processor documentation does. (Protip: you really want to use Intel syntax. Is a complete non-issue any decent tool will work with both syntaxes or have a counterpart or replacement that does. The other answers currently visible are all correct, but, in my opinion, miss the point. Language, for IA-32 and AMD64 processors and
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