In the generic procedure call standard, all function arguments passed on the stack consume slots in multiples of 8 bytes. A CALL puts an 8 byte return address on the stack, so to maintain stack pointer alignment, 40 bytes of "shadow space" is reserved on the stack. The documentation of calling conventions and binary interfaces of compilers and operating systems is often shamefully poor and sometimes completely absent. 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. and call in x64 should probably look like this. In the standard RISC-V calling convention, the stack grows downward and the stack pointer is functions, libraries) •Reduce chance for mistakes Warning: There is no one true MIPS calling convention. Calling Conventions for x64 ASM - social.msdn.microsoft.com lecture != book != gcc != spim != web When a function in a Windows x64 binary is called, the stack frame is used in the following manner: First four integer arguments are passed to RCX, RDX, R8 and R9 registers accordingly (green) Arguments 5, 6, and further are pushed on to the stack (blue) For details on the x64 calling convention, including register usage, stack parameters, return values, and stack . Currently using this 64-bit MASM code to call a C runtime function such as memcmp().I recall this convention was from a GoAsm article on optimizations.. memcmp PROTO;:QWORD,:QWORD,:QWORD PUSH RSP PUSH QWORD PTR [RSP] AND SPL, 0F 0h MOV R8,R11 MOV RDX,R10 MOV RCX,RAX SUB RSP, 32 CALL memcmp LEA RSP,[RSP+ 40] POP RSP iOS diverges from Procedure Call Standard for the ARM 64-bit Architecture in several ways, as described here. Windows 64-bit Calling Conventions - ACCU
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