x64 calling convention stack alignment

. The problem lies in fact that at time of performing CALL instruction the stack has to be 16-byte aligned. "Stdcall" tells the compiler that the caller of the function will pass all parameters on the stack in a right-to-left sequence and that . To understand the C calling convention, you should first make sure that you fully understand the push, pop, call, and ret instructions - these will be the basis for most of the rules. x64 Calling Conventions. 1.2.4. So 64-bit is the whole register, . ARM64 Function Calling Conventions - Luyi Xing's Blog So, for consistency's sake, it makes sense to adopt that calling convention for your own 32-bit DLL's as well. Windows uses a somewhat different ABI . Windows Assembly Languages - McDermott Cybersecurity that will be of use due to the 2 byte alignment MBE - 05/08/2015 x64, ARM, Windows 53 . • Clang, 64 bit, v. 5.0, 9.0 for Linux and Windows • Intel, 64 bit for Windows and Linux, v. 8.1 and 9.1 This document provides information that is typically difficult to find. Stack data structures support at least three operations: push adds a new element to the "top" of the stack; pop removes the . A calling convention describes the interface between a caller and a function: . Windows x64 Calling Convention: Stack Frame There are two primary versions of thiscall used depending on the compiler and whether or not the function uses variable arguments.. For the GCC compiler, thiscall is almost identical to cdecl: The caller cleans the stack, and the parameters are passed in right-to-left order. Since the "call" instruction pushes an 8-byte return address, this means that every non-leaf function is going to adjust the stack by a value of the form 16n+8 in order to restore 16-byte alignment. For example, take a look in the figure 2 below: Figure 2: '__vectorcall' denotes the use of Vector Calling Convention. " The stack pointer must be aligned to 16 bytes, except for leaf functions, in any region of code that isn't part of an epilog or prolog.

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