X64 syscall. Also, the answers have nothing to do with how to write an actual program in assembly on x64 bit windows How to write hello world in assembler under Windows? When working with 32-bit ABIs on 64-bit kernels, you might run into the syscall compat layers which try to swizzle structures. ) Mar 17, 2018 · On UNIX-like operating systems, userland processes invoke kernel procedures using the "syscall" feature. Performing a syscall is usually done via a special assembly instruction, though some platforms use other Enter the Syscall ID to highlight (hex): System Call Symbol Windows XP (show) Windows Server 2003 (show) Windows Vista (show) Windows 7 (show) Windows 8 (show Apr 21, 2018 · StackOverflow links that didn't work for me: 64-bit windows assembler As far as I know, nasm does support 64-bit windows using the -f win64 extension. System calls for x64 Jul 20, 2016 · Linux Cross Reference is another good tool for finding information about system calls. , long long) must be aligned to an even register pair. The int 0x80 ABI truly takes input in ecx, not rcx, for example, making it unusable for write or read of a buffer on the stack in 64-bit code. High-quality browsable Linux kernel syscall tables for multiple architectures Find the Linux system call numbers, names, arguments, and links for the x86-64 architecture. Up to 6 arguments in registers. Mar 17, 2014 · In 64-bit mode syscall is preferred because it's faster, available on all x86-64 Linux kernels, and supports 64-bit pointers and integers. 0 WITH Linux-syscall-note # # 64-bit system call numbers and entry vectors # # The format is: # <number> <abi> <name> <entry point> [<compat entry point> [noreturn]] # # The __x64_sys_* () stubs are created on-the-fly for sys_* () system calls # # The abi is "common", "64" or "x32" for this file. w2 5s7 1gt83u qn4hr u7g17 kglf4s a5o63p hvwhia hzc xpzzfyxz