Web Reference: IIRC, stack alignment is when variables are placed on the stack "aligned" to a particular number of bytes. So if you are using a 16 bit stack alignment, each variable on the stack is going to start from a byte that is a multiple of 2 bytes from the current stack pointer within a function. All memory beyond the current address of RSP is considered volatile: The OS, or a debugger, may overwrite this memory during a user debug session, or an interrupt handler. Thus, RSP must always be set before attempting to read or write values to a stack frame. "Stack alignment" just means the address of the stack (SP or ESP) is a multiple of the machine word size (so always divisible by 8 for 64-bit mode, 4 for 32-bit, 2 for 16-bit).
YouTube Excerpt: Part 1 of "How Programs Look in Assembly": https://youtu.be/2d0gKxGMGbc 00:00 Simple C Program 00:34 The
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