Typical stack addresses on x86-64 look like 0x7ffd'9f10'4f58—that is, close to 2 47. Win X64 Asm 1 | Home Introduction to writing x64 assembly in Visual Studio - lallous' lab assembly. There's a strict one-to-one correspondence between a function call's arguments and the registers used for those arguments. C enums have integer type-kind. Microsoft x64; 1.2. For C++ classes, the hidden this parameter is the first parameter, passed in RCX. Then align the stack on a 16-byte boundary, so maybe another push is needed to decrease rsp by 8 bytes. On x64 it must also allocate space for parameters of the called functions. From the MSDN blog 'The Old New Thing', The history of calling conventions, part 5: amd64: For Windows, the caller function passes the first four arguments to the registers in this order: rcx, rdx, r8, r9, and the rest are pushed back to the stack. It is meant to be used to make debugging x64 easier. The article concluded with a useful diagram presenting the stack frame layout of a typical function call. Things like stack alignment should also be considered when calling x64. Tags: Windows Assembly Calling Convention X86 64 Abi. x64 Assembly - Brent's Website 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. In the Microsoft x64 calling convention, it is the caller's responsibility to allocate 32 bytes of "shadow space" on the stack right before calling the . x86 calling conventions On x86 "sub esp, n" is used to allocated stack space for local variables. 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. This often fails by default without explicitly changing %rsp because call will store the 8 byte return address on the stack, so you usually need to do: sub 8, rsp call f. If this fails, segfault is common outcome.
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