Goal: have a single assembler source file which will assemble both to x86 (i386) and to x86_64 (amd64)?
Is this possible, for instance with YASM?
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Goal: have a single assembler source file which will assemble both to x86 (i386) and to x86_64 (amd64)?
Is this possible, for instance with YASM?
If you use conditional assemblying, you can. But don’t expect to write all the code once for x86 and have it work the same on x64 or the other way around. Use
%if and %ifdef.You could also create some macros that would expand to different things. For example, some
RAXPTRwould expand toEAXorRAXdepending on what platform you’re compiling and you can use thisRAXPTRwhere EAX/RAX is used as a pointer. Likewise you could create some macrosPARAM1/2/etcthat would expand to the routine params, to things likeECX/RCXandEDX/RDXfor the first two parameters in thefastcallconvention and[EBP+some constant]/[RBP+some constant]for the rest. Using macros in this manner can help you write mostly portable x86/x64 assembly code, but still, you can’t do this without things like %if and %ifdef.