- CPU that supports x86-64, with Windows 10 installed
- Visual Studio Community/Enterprise Edition, with C++ toolchain installed
- Microsoft Macro Assembler (x64), ml64.exe
- Microsoft Incremental Linker, link.exe
- Windows 64-bit Application Programming Interface, kernel32.Lib
- Place a copy of
...\um\x64\kernel32.Libin this directory. - Change the PATH variable to also point to the MASM and linker folders, or edit %pathToMASMFolder% in run.bat to point to the correct folder.
Run run.bat and select an example file.
| Register | Hardware | Software: x64 Calling Convention |
|---|---|---|
| RAX | Default accumulator | Return value, volatile |
| RBX | Index | Nonvolatile |
| RCX | Loop counter | 1st integer argument, volatile, usually exit status code |
| RDX | 2nd integer argument, volatile | |
| RSI | Source index | Nonvolatile |
| RDI | Destination index | Nonvolatile |
| RBP | Base pointer | Nonvolatile |
| RSP | Stack pointer | Nonvolatile |
| R8, R9 | 3rd/4th integer argument, volatile | |
| R10, R11 | Volatile | |
| R12-R15 | Nonvolatile |
Called procedure assumes:
- stack contains room for storing four 64-bit registers,
- RSP stack pointer is aligned on a 128-bit address boundary, And since, CALL instruction pushes its return address (8 bytes) onto the stack, so a shadow space of 40 bytes is typically reserved on the stack before procedure calls