A function calling this needs to have at least 32 bytes of stack to store the parameters and align the stack upon call. So, for consistency's sake, it makes sense to adopt that calling convention for your own 32-bit DLL's as well. Because of the different calling conventions (Microsoft x64 vs stdcall) and number of parameters for each API, the actual call to an API is made from seperate pieces of code we refer to as "dispatchers". From the MSDN blog 'The Old New Thing', The history of calling conventions, part 5: amd64: The calling convention of the System V AMD64 ABI is followed on GNU/ Linux. PDF 5. Calling conventions - Agner cpp-docs/x64-software-conventions.md at main - github.com Fastcall is the default calling convention on X64 where in the first 4 parameters are passed via the registers RCX, RDX, R8, R9. When talking about calling conventions you will hear about something called the "Application Binary Interface" (ABI). • The prologue sets-up the stack frame for the function by saving the base pointer to the stack and moving the base pointer to the top of the stack. Another difference that will need to be addressed in 64-bit is the calling convention that is used. . Generally, the best way to know the number of arguments a function receives is to inspect this function. x64 compilers can assume the presence of SSE registers, which on Windows have a calling convention associated with them (XMM6-15 are nonvolatile, aka callee-save). DoSomething1: sub rsp, 32 mov eax, ecx add eax, edx add eax, r8d // R8 is used without initialization add rsp, 32 retn. An Interesting Bit • Because of 2 & 4 byte instruction alignment, Also on x64 the stack must be 16 byte aligned, this means that sometimes you need to allocate even more space to preserve the alignment. The "Stdcall" convention is used throughout by the 32-bit Windows API (which consists of DLL's). functions, libraries) •Reduce chance for mistakes Warning: There is no one true MIPS calling convention. x64 Calling Conventions. A nice diagram of the stack and where 16-byte alignment occurs appears here in the YASM manual, 15.2 win64 Structured Exception Handling, as well as other information on x64 calling convention. Calling convention in x64 always uses the RCX, RDX, R8, R9 registers for passing the first 4 arguments (anything up to 64 bit values or pointers), while additionally to those 4 registers, RAX, R10 and R11 are considered volatile. " from "Unwindability" clause on Overview of x64 Calling . 3.5 Windows x64 Calling Convention - GitHub So, I want X,Y,Z to have the same arguments and this way, particularly for multiple functions it would be much more efficient than with "normal code" that would push all the argument once for each function call.
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