x64 calling convention stack alignment

windows - Code Review Stack Exchange In MASM, the ALIGN directive does not align local (or stack) variables, i.e. If the return value is an integer/struct/union whose size is less than or equal than 64 bits, . 64-bit stack frame with 1 local variable defined inside the callee function Note that the 1st argument, that we previously could access via rbp - 0x4 has been shifted up by 0x10 bytes and is now accessible via rbp - 0x14 whereas the local variable is now at rbp - 0x4 (where the 1st argument was when the function did not have a local variable . x64 calling convention | Microsoft Docs Introduction. Fastcall pushes function parameters backward (right to left). x64 Calling Conventions. x86-assembly-cheat/calling-convention.md at master - GitHub Fastcall pushes function parameters backward (right to left). Tags: Windows Assembly Calling Convention X86 64 Abi. GIF Animation - Page 4 - AutoIt Example Scripts - AutoIt Forums This is dramatically different from the typical convention where you push arguments unto the stack in reverse order prior to calling or a method. x64 ABI conventions | Microsoft Docs But there is also another calling convention worth knowing: the Microsoft x64 calling convention to be used in Windows programming. 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. The __fastcall convention uses registers for the first four arguments, and the stack frame to pass more arguments. x86-64 calling convention by gcc - SysTutorials Calling Conventions Calling Conventions •where to put function arguments •where to put return value •who saves and restores registers, and how •stack discipline Why? Calling convention - Wikipedia

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x64 calling convention stack alignment

x64 calling convention stack alignment